2,027 results on '"current: constraint"'
Search Results
2. High-efficiency InAs/GaAs quantum dot intermediate band solar cell achieved through current constraint engineering
- Author
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Sogabe, Tomah, Shoji, Yasushi, Miyashita, Naoya, Farrell, Daniel J., Shiba, Kodai, Hong, Hwen-Fen, and Okada, Yoshitaka
- Published
- 2023
- Full Text
- View/download PDF
Catalog
3. An MPPT Control Strategy Based on Current Constraint Relationships for a Photovoltaic System with a Battery or Supercapacitor
- Author
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Guohong Lai, Guoping Zhang, and Shaowu Li
- Subjects
PV system ,MPPT ,MPP ,current relationship ,linearized cell model ,Technology - Abstract
When the battery or supercapacitor is connected to the output of a PV system, the conventional voltage equation expressing its mathematical model usually must be replaced by the current relationship to study the maximum power point tracking (MPPT) control theory. However, hitherto, there is a lack of an attempt to disclose the current constraint relationships at the maximum power point (MPP), which leads to the potential risk of MPPT failure. To solve this problem, in this paper, the MPPT constraint conditions on the basis of currents are built and then a new MPPT control strategy is proposed. In this strategy, a linearized model parameter of a PV cell is used as the bridge to find the current relationships. On the basis of them, some expressions involving the duty cycle are built to directly calculate the control signal of the MPPT controller. Meanwhile, an implementation method is designed to match this proposed MPPT strategy. Finally, some simulation experiments are conducted. The simulation results verify that the proposed MPPT constraint expressions are accurate and workable and that the proposed MPPT strategy and its implementation process are feasible and available. In addition, the simulation results also show that the proposed MPPT strategy has a better MPPT speed and the same MPPT accuracy when the P&O method and fuzzy algorithm are compared. By this work, the MPPT constraint conditions based on current relationships are first found, representing a breakthrough in disclosing the inherent relationships between different currents when the PV system is operating around the MPP. more...
- Published
- 2024
- Full Text
- View/download PDF
4. Robust Finite-Time Control for DC–DC Buck Converter With Inductor Current Constraint
- Author
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Wang, Huiming, Zhang, Zhize, Weng, Ching-Yen, and Tang, Xianlun
- Abstract
This article investigates the voltage regulation of a dc–dc buck converter with the current constraint, which requires that the inductor current be held within a predetermined range to avoid hardware damage. Most of the existing methods face difficulties in maintaining satisfactory dynamic performance while complying with this current constraint. Meanwhile, the control performance of such a system is severely degraded by disturbances, especially mismatched disturbances, covering parameter uncertainties, input voltage fluctuations, and load resistance variations. For this reason, a robust finite-time control scheme is proposed by combining finite-time disturbance observer and finite-time control techniques. At the same time, a simple gain function-based strategy is introduced to restrict the inductor current in a specified region. Detailed finite-time stability of the complete closed-loop system driven by the recommended approach is guaranteed. Simulation and experimental results demonstrate that the newly designed control methodology outperforms the baseline control strategies in terms of the current constraint, dynamic performance, and disturbance rejection. more...
- Published
- 2024
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- View/download PDF
5. Current-constraint speed regulation for PMSM based on port-controlled Hamiltonian realization and deep deterministic policy gradient
- Author
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Wang, Min, primary, Liu, Yanhong, additional, Wang, Qi, additional, and Wheeler, Patrick, additional
- Published
- 2024
- Full Text
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6. Nonlinear Predictive Control of Interior Permanent Magnet Synchronous Machine with Extra Current Constraint
- Author
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Mengmeng Tian, Hailiang Cai, Wenliang Zhao, and Jie Ren
- Subjects
input−output feedback linearization ,interior permanent magnet synchronous machine ,nonlinear predictive control ,speed control ,Technology - Abstract
The interior permanent magnet synchronous machine (IPMSM) has been widely used in industrial applications due to its several favorable advantages. To further improve the machine performance, an improved nonlinear predictive controller for the IPMSM is proposed. In this paper, the maximum torque per ampere control law is firstly transformed to a linear function, according to the first−order Taylor expansion, and integrated with the control strategy. On this basis, an improved predictive control method is formulated by designing an optimized cost function through the input−output feedback linearization. Then the integral action is introduced to eliminate the influence of the load mutation and improve the steady−state control precision of the system. The stability of the control method is ensured by compelling the outputs to track the desired references without steady−state error. Finally, the simulation was established to verify the effective of the improved control method. Simulation results showed that the machine can reach the given reference speed without steady−state error within a short process, which means the machine has excellent dynamic and static performances. Furthermore, the machine has higher torque−to−current ratio by making full use of the reluctance torque. The simulation results verify the effectiveness of the improved control strategy. more...
- Published
- 2023
- Full Text
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7. Global Lepton-Quark Neutral Current Constraint on Low Scale Gravity Model
- Author
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Cheung, Kingman
- Subjects
High Energy Physics - Phenomenology ,High Energy Physics - Experiment - Abstract
We perform a global analysis of the lepton-quark neutral current data on the low scale gravity model, which arises from the extra dimensions. The global data include HERA neutral current deep-inelastic scattering, Drell-yan production at the Tevatron, and fermion pair production at LEPII. The Drell-yan production, due to the large invariant mass data, provides the strongest constraint. Combining all data, the effective Planck scale must be larger than about 1.12 TeV for $n=3$ and 0.94 TeV for $n=4$ at 95%CL., Comment: Analysis is updated with the newest ZEUS NC DIS data, which appeared after the first submission. Numerical results change slightly more...
- Published
- 1999
- Full Text
- View/download PDF
8. Novel fast terminal sliding mode controller with current constraint for permanent-magnet synchronous motor.
- Author
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Yao FANG, Huifang KONG, and Daoyuan DING
- Subjects
- *
SYNCHRONOUS electric motors , *SLIDING mode control , *INTERIOR-point methods , *CLOSED loop systems , *TORQUE control - Abstract
Under the noncascade structure, the balance between q-axis current constraint and dynamic performance in permanent-magnet synchronous motor system has become a critical problem. On the one hand, large transient current is required to provide high torque to achieve fast dynamic performance. On the other hand, current constraint becomes a state constraint problem, instead of governing q-axis reference current in the cascade structure directly. Aiming at this issue, a novel fast terminal sliding mode control (FTSMC)-based controller with current constraint is developed in this paper. The novelty of this scheme is related to the proposed penalty function based on interior point method, which is established in control action directly. Unlike ordinary solutions, the suggested solution combined with sliding mode variable can achieve current constraint of q-axis without scarifying dynamic performance. Furthermore, by adopting the FTSMC-type surface and new reaching law, the proposed implementation guarantees high performance with significant reduction of chattering phenomenon and has fast convergence characteristics. Then, the stability proof of the whole closed-loop system by employing the Lyapunov method is given in detail. Finally, series of simulations are provided to evaluate the performance of the presented FTSMC-type controller, in terms of current constraint, dynamic performance, and chattering reduction. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
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9. Adaptive Back-stepping Control of Servo Systems With Asymmetric Dead Zone
- Author
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Wang, Xue and Wang, Shubo
- Published
- 2024
- Full Text
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10. Virtual Current Constraint Based Segmented Trajectory Control Strategy for Flux-Weakening Operation of SPMSM Drives
- Author
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Wang, Hongzhe, Gan, Chun, Ni, Kai, Yu, Zhiyue, and Qu, Ronghai
- Abstract
This article proposes a virtual current constraint based segmented trajectory control strategy for surface-mounted permanent-magnet synchronous motor drives, to improve the transient performance under the flux-weakening operation. In the conventional scheme, the operating points (OPs) are arranged on the current constraint circle during the speed-rising process to provide the maximum electromagnetic torque. After the target speed is reached, there still exists an inevitable transition process that moves OP from the current constraint circle to the steady-state operating point (SSOP), leading to the speed overshoot, oscillation, and prolonged settling time. To solve this issue, a variable virtual current constraint is proposed to replace the fixed one. Based on the developed virtual current constraint, a novel operating point trajectory is designed, where SSOP and the target speed can be reached simultaneously without extra transition processes. Furthermore, to generate the virtual current constraint, a dual-variable based constraint method is put forward and applied to the output limitation of the speed controller. Compared to the conventional schemes, the transient performance can be significantly improved, where the speed overshoot and oscillation are eliminated, and the settling time is greatly shortened. Simulations and experiments are carried out to validate the effectiveness of the proposed scheme. more...
- Published
- 2023
- Full Text
- View/download PDF
11. Nonlinear Predictive Control of Interior Permanent Magnet Synchronous Machine with Extra Current Constraint
- Author
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Tian, Mengmeng, primary, Cai, Hailiang, additional, Zhao, Wenliang, additional, and Ren, Jie, additional
- Published
- 2023
- Full Text
- View/download PDF
12. An MPPT Control Strategy Based on Current Constraint Relationships for a Photovoltaic System with a Battery or Supercapacitor.
- Author
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Lai, Guohong, Zhang, Guoping, and Li, Shaowu
- Subjects
SOLAR cells ,PHOTOVOLTAIC power systems ,FUZZY algorithms ,PROBLEM solving ,MATHEMATICAL models ,MAXIMUM power point trackers - Abstract
When the battery or supercapacitor is connected to the output of a PV system, the conventional voltage equation expressing its mathematical model usually must be replaced by the current relationship to study the maximum power point tracking (MPPT) control theory. However, hitherto, there is a lack of an attempt to disclose the current constraint relationships at the maximum power point (MPP), which leads to the potential risk of MPPT failure. To solve this problem, in this paper, the MPPT constraint conditions on the basis of currents are built and then a new MPPT control strategy is proposed. In this strategy, a linearized model parameter of a PV cell is used as the bridge to find the current relationships. On the basis of them, some expressions involving the duty cycle are built to directly calculate the control signal of the MPPT controller. Meanwhile, an implementation method is designed to match this proposed MPPT strategy. Finally, some simulation experiments are conducted. The simulation results verify that the proposed MPPT constraint expressions are accurate and workable and that the proposed MPPT strategy and its implementation process are feasible and available. In addition, the simulation results also show that the proposed MPPT strategy has a better MPPT speed and the same MPPT accuracy when the P&O method and fuzzy algorithm are compared. By this work, the MPPT constraint conditions based on current relationships are first found, representing a breakthrough in disclosing the inherent relationships between different currents when the PV system is operating around the MPP. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
13. Adaptive neural network predefined time control for magnetic levitation linear motor with current constraints and mismatched disturbances
- Author
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Xu, Zelai, Lan, Yipeng, and Lei, Cheng
- Published
- 2024
- Full Text
- View/download PDF
14. Novel fast terminal sliding mode controller with current constraint for permanent-magnet synchronous motor
- Author
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FANG, Yao, primary, KONG, Huifang, additional, and DING, Daoyuan, additional
- Published
- 2021
- Full Text
- View/download PDF
15. Virtual Torque and Power Control of a Three-Phase Converter Connected to an Unbalanced Grid With Consideration of Converter Current Constraint and Operation Mode
- Author
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Grzegorz Iwanski
- Subjects
Physics ,020208 electrical & electronic engineering ,02 engineering and technology ,AC power ,Power (physics) ,Rectifier ,Control theory ,0202 electrical engineering, electronic engineering, information engineering ,Inverter ,Torque ,Maximum power transfer theorem ,Electrical and Electronic Engineering ,Power control ,Voltage - Abstract
The paper presents a three-phase power converter control under grid voltage imbalance. The proposed method adapts the current imbalance in relation to the inverter or rectifier operation. Under the inverter operation, the control target is to have the nonoscillatory $p$ component of instantaneous power and the $x_{v}$ component of instantaneous virtual torque calculated as the dot product of the grid virtual flux vector and the converter current vector. Then, the phase with lower voltage is supported by higher current. In the rectifier mode, the control target is to have the nonoscillatory $q$ component of power and the $T_{v}$ component of virtual torque calculated as the cross product of the virtual flux and the converter current. This way, the phase with the highest voltage is loaded by higher current. Unbalanced current obtained in both targets is limited in the way that allows us to limit true phase current and retain sinusoidal current waveforms. However, it does not allow maximum power transfer at the given grid voltage asymmetry, so in order to increase the power value, current progressive balancing is proposed in both operation modes. Finally, converter current balancing is applied also in the case in which a significant amount of reactive power is referenced. more...
- Published
- 2019
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16. Maximization of flux-linkage in HTS motors using shape design sensitivity analysis with critical current constraint
- Author
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Lee, Joon-Ho; Joo, Jinhoo, Choi, Hong-Soon; Byun, Jin-Kyu, Nah, Wansoo; Kwon, Young-Kil, Park, Il-Han; Sohn, Myung-Hwan, and Kang, Joonsun; Kim, Seog-Whan
- Subjects
Rotors -- Thermal properties ,High temperature superconductors -- Thermal properties ,Business ,Electronics ,Electronics and electrical industries - Abstract
The rotor winding shape of HTS (High Temperature Superconducting) motor is designed to maximum flux-linkage of stator winging with a given amount of superconductor volume. With the help of three step design procedure of shape design and sizing design, the final optimal rotor winding for easy industrial manufacturing was obtained. more...
- Published
- 2004
17. An MPC Control System for Onboard Ultracapacitors with Maximum Current Constraint
- Author
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Yu Song, Zhiwu Huang, Rong Zhou, Jun Peng, and Heng Li
- Subjects
Supercapacitor ,Computer science ,ComputerApplications_COMPUTERSINOTHERSYSTEMS ,Charge (physics) ,02 engineering and technology ,Kalman filter ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,01 natural sciences ,Human-Computer Interaction ,Constraint (information theory) ,Artificial Intelligence ,Control theory ,Control system ,Computer Vision and Pattern Recognition ,Current (fluid) ,0210 nano-technology ,0105 earth and related environmental sciences - Abstract
This study proposes model predictive control (MPC) for onboard ultracapacitors for light rail vehicles using a maximum current constraint. In this study, a Kalman filter is used to estimate the system states. Compared to the PID controller, the MPC-based charging control strategy can solve the maximum current limit problem because it converts the charging problem to an optimization one. Simulation and experiments are carried out to demonstrate the effectiveness of the method. more...
- Published
- 2017
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18. Fault Current Constraint Transmission Expansion Planning Based on the Inverse Matrix Modification Lemma and a Valid Inequality
- Author
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Lee, Sungwoo, primary, Kim, Hyoungtae, additional, Kim, Tae Hyun, additional, Shin, Hansol, additional, and Kim, Wook, additional
- Published
- 2019
- Full Text
- View/download PDF
19. Virtual Torque and Power Control of a Three-Phase Converter Connected to an Unbalanced Grid With Consideration of Converter Current Constraint and Operation Mode
- Author
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Iwanski, Grzegorz, primary
- Published
- 2019
- Full Text
- View/download PDF
20. Fault Current Constraint Transmission Expansion Planning Based on the Inverse Matrix Modification Lemma and a Valid Inequality
- Author
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Hyoung Tae Kim, Wook Kim, Sungwoo Lee, Tae Hyun Kim, and Hansol Shin
- Subjects
Control and Optimization ,Computer science ,020209 energy ,Computation ,Energy Engineering and Power Technology ,Valid Inequality ,02 engineering and technology ,Fault Current Level Constraint ,Impedance parameters ,Fault (power engineering) ,01 natural sciences ,Nonlinear programming ,Admittance parameters ,Matrix (mathematics) ,Computer Science::Hardware Architecture ,Linearization ,Control theory ,0103 physical sciences ,Inverse Matrix Modification Lemma ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,010306 general physics ,Engineering (miscellaneous) ,Renewable Energy, Sustainability and the Environment ,Nonlinear system ,Electric power transmission ,Transmission Expansion Planning (TEP) ,Energy (miscellaneous) - Abstract
In the transmission expansion planning (TEP) problem, it is challenging to consider a fault current level constraint due to the time-consuming update process of the bus impedance matrix, which is required to calculate the fault currents during the search for the optimal solution. In the existing studies, either a nonlinear update equation or its linearized version is used to calculate the updated bus impedance matrix. In the former case, there is a problem in that the mathematical formulation is derived in the form of mixed-integer nonlinear programming. In the latter case, there is a problem in that an error due to the linearization may exist and the change of fault currents in other buses that are not connected to the new transmission lines cannot be detected. In this paper, we use a method to obtain the exact updated bus impedance matrix directly from the inversion of the bus admittance matrix. We propose a novel method based on the inverse matrix modification lemma (IMML) and a valid inequality is proposed to find a better solution to the TEP problem with fault current level constraint. The proposed method is applied to the IEEE two-area reliability test system with 96 buses to verify the performance and effectiveness of the proposed method and we compare the results with the existing methods. Simulation results show that the existing TEP method based on impedance matrix modification method violates the fault current level constraint in some buses, while the proposed method satisfies the constraint in all buses in a reasonable computation time. more...
- Published
- 2019
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21. Researchers from Hefei University of Technology Describe Findings in Computer Science (Novel Fast Terminal Sliding Mode Controller With Current Constraint for Permanent-magnet Synchronous Motor)
- Subjects
Magnets, Permanent ,Computers ,News, opinion and commentary - Abstract
2021 SEP 1 (VerticalNews) -- By a News Reporter-Staff News Editor at Computer Weekly News -- Current study results on Science - Computer Science have been published. According to news [...]
- Published
- 2021
22. Spatial Distribution of Turbulent Heat Fluxes in the Western North Pacific : Ocean Current Constraint for Hot Spot of Mid-Latitude Air-Sea Interaction
- Author
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Minobe, Shoshiro and Minobe, Shoshiro
- Abstract
International Symposium, "The Origin and Evolution of Natural Diversity". 1–5 October 2007. Sapporo, Japan., Climatological mean distributions of turbulent heat fluxes (i.e., latent plus sensible heat fluxes) have been documented using an operational analysis dataset, whose spatial resolution is about one order higher than the resolution of widely used reanalysis datasets. It is revealed that mean oceanic currents and associated Sea-Surface Temperature (SST) fronts, i.e., the Kuroshio, the Kuroshio Extension, and the subpolar front (also sometimes called the Oyashio extension), strongly affect the heat fluxes. Such close constraints are not discernible in the reanalysis dataset. The present results indicate that the narrow ocean currents and associated sharp SST fronts are essential for the interaction between the atmosphere and ocean. more...
- Published
- 2008
23. Effects of External Current Constraint on the Belousov-Zhabotinskii System Measured by a Pt Electrode
- Author
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Hongliang Ge, Jiuli Luo, Yongdong Jin, and Guoying Wei
- Subjects
Physics::Instrumentation and Detectors ,Stability criterion ,Chemistry ,Limit cycle oscillation ,Phase (waves) ,Thermodynamics ,General Chemistry ,Constraint (information theory) ,Pt electrode ,Physics::Plasma Physics ,Limit cycle ,Electrode ,Atomic physics ,Current (fluid) - Abstract
The Belousov-Zhabotinskii system measured by a Pt electrode is investigated under external electrode current constraint. A dynamical analysis of the electrode reaction phase has been made by means of a linearized stability criterion valid for three-variable system. It turns out that limit cycle oscillatory regime and dynamical behaviors of the electrode reaction phase have been degenerated under periodical electrode current. more...
- Published
- 2005
- Full Text
- View/download PDF
24. Maximization of Flux-Linkage in HTS Motors Using Shape Design Sensitivity Analysis With Critical Current Constraint
- Author
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Jin-Kyu Byun, Joon-Ho Lee, Jinho Joo, Hong-Soon Choi, Il-Han Park, Myung-Hwan Sohn, Seog-Whan Kim, Joonsun Kang, Wansoo Nah, and Young-Kil Kwon
- Subjects
Electric motor ,Stator ,Rotor (electric) ,Computer science ,Condensed Matter Physics ,Flux linkage ,Electronic, Optical and Magnetic Materials ,law.invention ,Design objective ,law ,Electromagnetic coil ,Control theory ,Shape optimization ,Sensitivity (control systems) ,Electrical and Electronic Engineering - Abstract
This paper proposes a design method for optimizing the rotor winding shape of HTS motor. The design objective is to maximize the flux-linkage of stator winding with a given amount of superconductor volume. The increase of flux-linkage results in output-power increase, compact size and quench-reliable characteristic. The optimization algorithm is a design sensitivity analysis where the HTS critical current condition is taken into account. First, the shape of rotor winding is optimized to give a boundary shape of smooth curves. Second, with the shape the rectangular sizes of windings are approximately obtained for easy manufacture. Finally, the rectangular sizes are also optimized for fine-size tuning. The proposed design method is applied to the 100-hp HTS motor. more...
- Published
- 2004
- Full Text
- View/download PDF
25. Global lepton-quark neutral current constraint on low scale gravity model
- Author
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Kingman Cheung
- Subjects
Quark ,Physics ,Nuclear and High Energy Physics ,Particle physics ,Neutral current ,Scale (ratio) ,Nuclear Theory ,High Energy Physics::Phenomenology ,Tevatron ,FOS: Physical sciences ,HERA ,High Energy Physics - Experiment ,High Energy Physics - Phenomenology ,High Energy Physics - Experiment (hep-ex) ,Extra dimensions ,High Energy Physics - Phenomenology (hep-ph) ,Pair production ,High Energy Physics::Experiment ,Invariant mass - Abstract
We perform a global analysis of the lepton-quark neutral current data on the low scale gravity model, which arises from the extra dimensions. The global data include HERA neutral current deep-inelastic scattering, Drell-yan production at the Tevatron, and fermion pair production at LEPII. The Drell-yan production, due to the large invariant mass data, provides the strongest constraint. Combining all data, the effective Planck scale must be larger than about 1.12 TeV for $n=3$ and 0.94 TeV for $n=4$ at 95%CL., Comment: Analysis is updated with the newest ZEUS NC DIS data, which appeared after the first submission. Numerical results change slightly more...
- Published
- 1999
- Full Text
- View/download PDF
26. An eddy current constraint formulation for 3D electromagnetic field calculations
- Author
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H. Song and Nathan Ida
- Subjects
Electromagnetic field ,Physics ,Field (physics) ,Gauge (firearms) ,Magnetostatics ,Electronic, Optical and Magnetic Materials ,law.invention ,Constraint (information theory) ,law ,Quantum electrodynamics ,Eddy current ,Coulomb ,Magnetic potential ,Electrical and Electronic Engineering - Abstract
The use of Coulomb's gauge is sufficient for a unique solution in 3-D magnetostatic field calculations in terms of the magnetic vector potential. For the sinusoidal steady-state eddy current problem Coulomb's gauge is not sufficient. The combination of Coulomb's gauge and an eddy current constraint provides a simple way of guaranteeing uniqueness. A formulation for 3-D electromagnetic fields utilizing this constraint is proposed. Results comparing this formulation with other finite-element formulations and with experimental data are given. > more...
- Published
- 1991
- Full Text
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27. Effects of External Current Constraint on the Belousov-Zhabotinskii System Measured by a Pt Electrode
- Published
- 2005
- Full Text
- View/download PDF
28. Maximization of Flux-Linkage in HTS Motors Using Shape Design Sensitivity Analysis With Critical Current Constraint
- Published
- 2004
- Full Text
- View/download PDF
29. Where is your current constraint?
- Author
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Lynch, Mike
- Subjects
Business ,Metals, metalworking and machinery industries - Abstract
We've offered many specific suggestions for improving your CNC environment in this column. Indeed, our primary focus is to help you find ways to improve. However, we've pretty much left [...]
- Published
- 2004
30. Overcurrent Protection and Unmatched Disturbance Rejection under Non-Cascade Structure for PMSM
- Author
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Changhong Jiang, Qiming Wang, Niaona Zhang, and Haitao Ding
- Subjects
permanent magnet synchronous motor ,unmatched disturbance ,drive-current constraint ,fast non-singular terminal sliding mode ,sliding-mode disturbance observer ,Technology - Abstract
A non-cascade structure with a simple parameter adjustment method and satisfying dynamic performance is investigated so as to address the problem of the complicated structure of a typical cascade control system of permanent magnet synchronous motor (PMSM) system. However, the current cannot work within a limited value under this structure, which poses a risk to circuit safety. To this end, a fast non-singular sliding mode (FNTSM) speed-control strategy is proposed to solve the inadequate resilience of the PI controller. Then, a nonlinear term is developed to address the q-axis current overrun. Furthermore, a sliding-mode disturbance observer (SMDO) is proposed to compensate for the current fluctuation caused by the unmatched load torque disturbances. Finally, stability analysis is conducted for the proposed composite strategy, and the hardware-in-the-loop experiments verify that it achieves satisfying speed-tracking performance and ensures overcurrent protection under unmatched disturbances. more...
- Published
- 2022
- Full Text
- View/download PDF
31. An eddy current constraint formulation for 3D electromagnetic field calculations
- Author
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Song, H., primary and Ida, N., additional
- Published
- 1991
- Full Text
- View/download PDF
32. Finite Control Set Model Predictive Current ControlFCS-MPC Based on Cost Function Optimization,with Current Limit Constraints for Four-Leg VSI
- Author
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Riyadh G. Omar and Rabee' H. Thejel
- Subjects
current control ,current constraint ,finite set ,four-leg inverter ,model predictive control ,SVPWM ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
A Matlab/Simulink model for the Finite Control Set Model Predictive current Control FCS-MPC based on cost function optimization, with current limit constraints for four-leg VSI is presented in this paper, as a new control algorithm. The algorithm selects the switching states that produce minimum error between the reference currents and the predicted currents via optimization process, and apply the corresponding switching control signals to the inverter switches. The new algorithm also implements current constraints which excludes any switching state that produces currents above the desired references. Therefore, the system response is enhanced since there is no overshoots or deviations from references. Comparison is made between the Space Vector Pulse Width Modulation SVPWM and the FCS-MPC control strategies for the same load conditions. The results show the superiority of the new control strategy with observed reduction in inverter output voltage THD by 10% which makes the FCS-MPC strategy more preferable for loads that requires less harmonics distortion. more...
- Published
- 2016
33. $Z^\prime$-mediated Majorana dark matter: suppressed direct-detection rate and complementarity of LHC searches
- Author
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Alanne, T., Bishara, F., Fiaschi, J., Fischer, O., Gorbahn, M., and Moldanazarova, U.
- Subjects
Nuclear and High Energy Physics ,interpretation of experiments: CERN LHC Coll ,scattering [dark matter] ,New Gauge Interactions ,FOS: Physical sciences ,dark matter: direct detection ,constraint [current] ,current: constraint ,High Energy Physics - Phenomenology (hep-ph) ,benchmark ,TeV ,ddc:530 ,Dark Matter at Colliders ,mediation ,dark matter, scattering ,direct detection [dark matter] ,dark matter: relic density ,nucleus ,suppression ,sensitivity ,current, constraint ,dark matter: scattering ,High Energy Physics - Phenomenology ,CERN LHC Coll ,SMEFT ,CERN LHC Coll [interpretation of experiments] ,Models for Dark Matter ,relic density [dark matter] ,direct detection ,Majorana - Abstract
Journal of high energy physics 08(8), 093 (2022). doi:10.1007/JHEP08(2022)093, We study the direct-detection rate for axial-vectorial dark matter scattering off nuclei in an SU(2) × U(1) invariant effective theory and compare it against the LHC reach. Current constraints from direct detection experiments are already bounding the mediator mass to be well into the TeV range for WIMP-like scenarios. This motivates a consistent and systematic exploration of the parameter space to map out possible regions where the rates could be suppressed. We do indeed find such regions and proceed to construct consistent UV models that generate the relevant effective theory. We then discuss the corresponding constraints from both collider and direct-detection experiments on the same parameter space. We find a benchmark scenario, where even for future XENONnT experiment, LHC constraints will have a greater sensitivity to the mediator mass., Published by SISSA, [Trieste] more...
- Published
- 2022
- Full Text
- View/download PDF
34. A Disturbance Observer-Based Current-Constrained Controller for Speed Regulation of PMSM Systems Subject to Unmatched Disturbances.
- Author
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Dai, Chen, Guo, Tianliang, Yang, Jun, and Li, Shihua
- Subjects
- *
SPEED limits , *PERMANENT magnet motors , *TRACKING control systems , *OVERCURRENT protection , *DYNAMICAL systems , *REFERENCE values - Abstract
The speed regulation problem of permanent magnet synchronous motor system is investigated under a noncascade structure. Despite its superiority in straightforward control design, simple parameter adjustment, and satisfying system dynamic performance, the structure brings two problems: the overcurrent protection and unmatched disturbance rejection. Under this structure, the current cannot any more be restricted by a reference value, and ought to be constrained within a certain range to ensure the circuit safety. Besides, unmatched disturbances, mainly caused by external load torques, may result in undesired interference and violate the constraint requirement, since they affect the current directly via the same channel. Toward that end, a novel current-constrained control algorithm is designed to tackle the current constraint and unmatched disturbances simultaneously. A disturbance observer (DOB) is utilized for unmatched disturbance estimation. A constraint coping mechanism is constructed to restrict the current. Then, a key nonlinear item is proposed by augmenting the disturbance estimation and the constrained current. Finally, a composite controller is proposed with concise structure and rigorous closed-loop stability analysis. Numerical and experimental tests further validate that the proposed control approach achieves promising speed tracking performance and guarantees the current constraint in the presence of unmatched disturbances. [ABSTRACT FROM AUTHOR] more...
- Published
- 2021
- Full Text
- View/download PDF
35. Time‐optimal finite control set model predictive control of non‐isolated DC–DC converters.
- Author
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Harzig, Thibaut and Grainger, Brandon
- Subjects
POWER electronics ,LARGE deviations (Mathematics) ,DYNAMIC models ,PREDICTION models ,VOLTAGE ,DC-to-DC converters - Abstract
The authors propose a time‐optimal finite control‐set model predictive control (FCS‐MPC) formulation, generalised to the three most common non‐isolated DC–DC converters (buck, boost, buck–boost) tracking a constant switching frequency. The generalised switching model is used to formulate natural trajectories and the internal dynamic model for all three converters. The proposed FCS‐MPC also allows the control designer to implement current and voltage constraints to limit current spikes and voltage deviations, respectively. The proposed FCS‐MPC is compared to classical FCS‐MPC and boundary controllers that also use natural trajectories for time optimality but at the cost of large voltage deviations. Classical FCS‐MPC, time‐optimal boundary control and the proposed FCS‐MPC have been implemented in PLECS for all three converters. The current constraint does not impact control performance while the voltage constraint improves voltage deviation performances without significantly impacting the control speed compared to time‐optimal boundary control. Finally, a hardware implementation of the proposed FCS‐MPC on a buck converter proves that the control scheme is time optimal and mitigates current spikes while operating at a constant switching frequency at steady‐state. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
36. Search for an Axionlike Particle in B Meson Decays
- Author
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J P, Lees, V, Poireau, V, Tisserand, E, Grauges, A, Palano, G, Eigen, D N, Brown, Yu G, Kolomensky, M, Fritsch, H, Koch, T, Schroeder, R, Cheaib, C, Hearty, T S, Mattison, J A, McKenna, R Y, So, V E, Blinov, A R, Buzykaev, V P, Druzhinin, V B, Golubev, E A, Kozyrev, E A, Kravchenko, A P, Onuchin, S I, Serednyakov, Yu I, Skovpen, E P, Solodov, K Yu, Todyshev, A J, Lankford, B, Dey, J W, Gary, O, Long, A M, Eisner, W S, Lockman, W, Panduro Vazquez, D S, Chao, C H, Cheng, B, Echenard, K T, Flood, D G, Hitlin, J, Kim, Y, Li, D X, Lin, S, Middleton, T S, Miyashita, P, Ongmongkolkul, J, Oyang, F C, Porter, M, Röhrken, Z, Huard, B T, Meadows, B G, Pushpawela, M D, Sokoloff, L, Sun, J G, Smith, S R, Wagner, D, Bernard, M, Verderi, D, Bettoni, C, Bozzi, R, Calabrese, G, Cibinetto, E, Fioravanti, I, Garzia, E, Luppi, V, Santoro, A, Calcaterra, R, de Sangro, G, Finocchiaro, S, Martellotti, P, Patteri, I M, Peruzzi, M, Piccolo, M, Rotondo, A, Zallo, S, Passaggio, C, Patrignani, I, Flood, N, Nguyen, B J, Shuve, H M, Lacker, B, Bhuyan, U, Mallik, C, Chen, J, Cochran, S, Prell, A V, Gritsan, N, Arnaud, M, Davier, F, Le Diberder, A M, Lutz, G, Wormser, D J, Lange, D M, Wright, J P, Coleman, E, Gabathuler, D E, Hutchcroft, D J, Payne, C, Touramanis, A J, Bevan, F, Di Lodovico, R, Sacco, G, Cowan, Sw, Banerjee, C L, Davis, A G, Denig, W, Gradl, K, Griessinger, A, Hafner, K R, Schubert, R J, Barlow, G D, Lafferty, R, Cenci, A, Jawahery, D A, Roberts, R, Cowan, S H, Robertson, R M, Seddon, N, Neri, F, Palombo, L, Cremaldi, R, Godang, D J, Summers, P, Taras, G, De Nardo, C, Sciacca, G, Raven, C P, Jessop, J M, LoSecco, K, Honscheid, R, Kass, A, Gaz, M, Margoni, M, Posocco, G, Simi, F, Simonetto, R, Stroili, S, Akar, E, Ben-Haim, M, Bomben, G R, Bonneaud, G, Calderini, J, Chauveau, G, Marchiori, J, Ocariz, M, Biasini, E, Manoni, A, Rossi, G, Batignani, S, Bettarini, M, Carpinelli, G, Casarosa, M, Chrzaszcz, M, De Nuccio, F, Forti, M A, Giorgi, A, Lusiani, B, Oberhof, E, Paoloni, M, Rama, G, Rizzo, J J, Walsh, L, Zani, A J S, Smith, F, Anulli, R, Faccini, F, Ferrarotto, F, Ferroni, A, Pilloni, G, Piredda, C, Bünger, S, Dittrich, O, Grünberg, M, Heß, T, Leddig, C, Voß, R, Waldi, T, Adye, F F, Wilson, S, Emery, G, Vasseur, D, Aston, C, Cartaro, M R, Convery, J, Dorfan, W, Dunwoodie, M, Ebert, R C, Field, B G, Fulsom, M T, Graham, C, Hast, W R, Innes, P, Kim, D W G S, Leith, S, Luitz, D B, MacFarlane, D R, Muller, H, Neal, B N, Ratcliff, A, Roodman, M K, Sullivan, J, Va'vra, W J, Wisniewski, M V, Purohit, J R, Wilson, A, Randle-Conde, S J, Sekula, H, Ahmed, N, Tasneem, M, Bellis, P R, Burchat, E M T, Puccio, M S, Alam, J A, Ernst, R, Gorodeisky, N, Guttman, D R, Peimer, A, Soffer, S M, Spanier, J L, Ritchie, R F, Schwitters, J M, Izen, X C, Lou, F, Bianchi, F, De Mori, A, Filippi, D, Gamba, L, Lanceri, L, Vitale, F, Martinez-Vidal, A, Oyanguren, J, Albert, A, Beaulieu, F U, Bernlochner, G J, King, R, Kowalewski, T, Lueck, C, Miller, I M, Nugent, J M, Roney, R J, Sobie, T J, Gershon, P F, Harrison, T E, Latham, R, Prepost, S L, Wu, Lees, J, Poireau, V, Tisserand, V, Grauges, E, Palano, A, Eigen, G, Brown, D, Kolomensky, Y, Fritsch, M, Koch, H, Schroeder, T, Cheaib, R, Hearty, C, Mattison, T, Mckenna, J, So, R, Blinov, V, Buzykaev, A, Druzhinin, V, Golubev, V, Kozyrev, E, Kravchenko, E, Onuchin, A, Serednyakov, S, Skovpen, Y, Solodov, E, Todyshev, K, Lankford, A, Dey, B, Gary, J, Long, O, Eisner, A, Lockman, W, Panduro Vazquez, W, Chao, D, Cheng, C, Echenard, B, Flood, K, Hitlin, D, Kim, J, Li, Y, Lin, D, Middleton, S, Miyashita, T, Ongmongkolkul, P, Oyang, J, Porter, F, Röhrken, M, Huard, Z, Meadows, B, Pushpawela, B, Sokoloff, M, Sun, L, Smith, J, Wagner, S, Bernard, D, Verderi, M, Bettoni, D, Bozzi, C, Calabrese, R, Cibinetto, G, Fioravanti, E, Garzia, I, Luppi, E, Santoro, V, Calcaterra, A, de Sangro, R, Finocchiaro, G, Martellotti, S, Patteri, P, Peruzzi, I, Piccolo, M, Rotondo, M, Zallo, A, Passaggio, S, Patrignani, C, Flood, I, Nguyen, N, Shuve, B, Lacker, H, Bhuyan, B, Mallik, U, Chen, C, Cochran, J, Prell, S, Gritsan, A, Arnaud, N, Davier, M, Le Diberder, F, Lutz, A, Wormser, G, Lange, D, Wright, D, Coleman, J, Gabathuler, E, Hutchcroft, D, Payne, D, Touramanis, C, Bevan, A, Di Lodovico, F, Sacco, R, Cowan, G, Banerjee, S, Davis, C, Denig, A, Gradl, W, Griessinger, K, Hafner, A, Schubert, K, Barlow, R, Lafferty, G, Cenci, R, Jawahery, A, Roberts, D, Cowan, R, Robertson, S, Seddon, R, Neri, N, Palombo, F, Cremaldi, L, Godang, R, Summers, D, Taras, P, De Nardo, G, Sciacca, C, Raven, G, Jessop, C, Losecco, J, Honscheid, K, Kass, R, Gaz, A, Margoni, M, Posocco, M, Simi, G, Simonetto, F, Stroili, R, Akar, S, Ben-Haim, E, Bomben, M, Bonneaud, G, Calderini, G, Chauveau, J, Marchiori, G, Ocariz, J, Biasini, M, Manoni, E, Rossi, A, Batignani, G, Bettarini, S, Carpinelli, M, Casarosa, G, Chrzaszcz, M, De Nuccio, M, Forti, F, Giorgi, M, Lusiani, A, Oberhof, B, Paoloni, E, Rama, M, Rizzo, G, Walsh, J, Zani, L, Smith, A, Anulli, F, Faccini, R, Ferrarotto, F, Ferroni, F, Pilloni, A, Piredda, G, Bünger, C, Dittrich, S, Grünberg, O, Heß, M, Leddig, T, Voß, C, Waldi, R, Adye, T, Wilson, F, Emery, S, Vasseur, G, Aston, D, Cartaro, C, Convery, M, Dorfan, J, Dunwoodie, W, Ebert, M, Field, R, Fulsom, B, Graham, M, Hast, C, Innes, W, Kim, P, Leith, D, Luitz, S, Macfarlane, D, Muller, D, Neal, H, Ratcliff, B, Roodman, A, Sullivan, M, Va'Vra, J, Wisniewski, W, Purohit, M, Wilson, J, Randle-Conde, A, Sekula, S, Ahmed, H, Tasneem, N, Bellis, M, Burchat, P, Puccio, E, Alam, M, Ernst, J, Gorodeisky, R, Guttman, N, Peimer, D, Soffer, A, Spanier, S, Ritchie, J, Schwitters, R, Izen, J, Lou, X, Bianchi, F, De Mori, F, Filippi, A, Gamba, D, Lanceri, L, Vitale, L, Martinez-Vidal, F, Oyanguren, A, Albert, J, Beaulieu, A, Bernlochner, F, King, G, Kowalewski, R, Lueck, T, Miller, C, Nugent, I, Roney, J, Sobie, R, Gershon, T, Harrison, P, Latham, T, Prepost, R, Wu, S, Lees, J P, Brown, D N, Kolomensky, Yu G, Mattison, T S, McKenna, J A, So, R Y, Blinov, V E, Buzykaev, A R, Druzhinin, V P, Golubev, V B, Kozyrev, E A, Kravchenko, E A, Onuchin, A P, Serednyakov, S I, Skovpen, Yu I, Solodov, E P, Todyshev, K Yu, Lankford, A J, Gary, J W, Eisner, A M, Lockman, W S, Chao, D S, Cheng, C H, Flood, K T, Hitlin, D G, Lin, D X, Miyashita, T S, Porter, F C, Meadows, B T, Pushpawela, B G, Sokoloff, M D, Smith, J G, Wagner, S R, Peruzzi, I M, Shuve, B J, Lacker, H M, Gritsan, A V, Lutz, A M, Lange, D J, Wright, D M, Coleman, J P, Hutchcroft, D E, Payne, D J, Bevan, A J, Banerjee, Sw, Davis, C L, Denig, A G, Schubert, K R, Barlow, R J, Lafferty, G D, Roberts, D A, Robertson, S H, Seddon, R M, Summers, D J, Jessop, C P, LoSecco, J M, Bonneaud, G R, Giorgi, M A, Walsh, J J, Smith, A J S, Wilson, F F, Convery, M R, Field, R C, Fulsom, B G, Graham, M T, Innes, W R, Leith, D W G S, MacFarlane, D B, Muller, D R, Ratcliff, B N, Sullivan, M K, Va'vra, J, Wisniewski, W J, Purohit, M V, Wilson, J R, Sekula, S J, Burchat, P R, Puccio, E M T, Alam, M S, Ernst, J A, Peimer, D R, Spanier, S M, Ritchie, J L, Schwitters, R F, Izen, J M, Lou, X C, Bernlochner, F U, King, G J, Nugent, I M, Roney, J M, Sobie, R J, Gershon, T J, Harrison, P F, Latham, T E, Wu, S L, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, BaBar, Lees, J. P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D. N., Kolomensky, Y. G., Fritsch, M., Koch, H., Schroeder, T., Cheaib, R., Hearty, C., Mattison, T. S., Mckenna, J. A., So, R. Y., Blinov, V. E., Buzykaev, A. R., Druzhinin, V. P., Golubev, V. B., Kozyrev, E. A., Kravchenko, E. A., Onuchin, A. P., Serednyakov, S. I., Skovpen, Y. I., Solodov, E. P., Todyshev, K. Y., Lankford, A. J., Dey, B., Gary, J. W., Long, O., Eisner, A. M., Lockman, W. S., Panduro Vazquez, W., Chao, D. S., Cheng, C. H., Echenard, B., Flood, K. T., Hitlin, D. G., Kim, J., Li, Y., Lin, D. X., Middleton, S., Miyashita, T. S., Ongmongkolkul, P., Oyang, J., Porter, F. C., Rohrken, M., Huard, Z., Meadows, B. T., Pushpawela, B. G., Sokoloff, M. D., Sun, L., Smith, J. G., Wagner, S. R., Bernard, D., Verderi, M., Bettoni, D., Bozzi, C., Calabrese, R., Cibinetto, G., Fioravanti, E., Garzia, I., Luppi, E., Santoro, V., Calcaterra, A., De Sangro, R., Finocchiaro, G., Martellotti, S., Patteri, P., Peruzzi, I. M., Piccolo, M., Rotondo, M., Zallo, A., Passaggio, S., Patrignani, C., Flood, I., Nguyen, N., Shuve, B. J., Lacker, H. M., Bhuyan, B., Mallik, U., Chen, C., Cochran, J., Prell, S., Gritsan, A. V., Arnaud, N., Davier, M., Le Diberder, F., Lutz, A. M., Wormser, G., Lange, D. J., Wright, D. M., Coleman, J. P., Gabathuler, E., Hutchcroft, D. E., Payne, D. J., Touramanis, C., Bevan, A. J., Di Lodovico, F., Sacco, R., Cowan, G., Banerjee, S. W., Davis, C. L., Denig, A. G., Gradl, W., Griessinger, K., Hafner, A., Schubert, K. R., Barlow, R. J., Lafferty, G. D., Cenci, R., Jawahery, A., Roberts, D. A., Cowan, R., Robertson, S. H., Seddon, R. M., Neri, N., Palombo, F., Cremaldi, L., Godang, R., Summers, D. J., Taras, P., De Nardo, G., Sciacca, C., Raven, G., Jessop, C. P., Losecco, J. M., Honscheid, K., Kass, R., Gaz, A., Margoni, M., Posocco, M., Simi, G., Simonetto, F., Stroili, R., Akar, S., Ben-Haim, E., Bomben, M., Bonneaud, G. R., Calderini, G., Chauveau, J., Marchiori, G., Ocariz, J., Biasini, M., Manoni, E., Rossi, A., Batignani, G., Bettarini, S., Carpinelli, M., Casarosa, G., Chrzaszcz, M., De Nuccio, M., Forti, F., Giorgi, M. A., Lusiani, A., Oberhof, B., Paoloni, E., Rama, M., Rizzo, G., Walsh, J. J., Zani, L., Smith, A. J. S., Anulli, F., Faccini, R., Ferrarotto, F., Ferroni, F., Pilloni, A., Piredda, G., Bunger, C., Dittrich, S., Grunberg, O., Hess, M., Leddig, T., Voss, C., Waldi, R., Adye, T., Wilson, F. F., Emery, S., Vasseur, G., Aston, D., Cartaro, C., Convery, M. R., Dorfan, J., Dunwoodie, W., Ebert, M., Field, R. C., Fulsom, B. G., Graham, M. T., Hast, C., Innes, W. R., Kim, P., Leith, D. W. G. S., Luitz, S., Macfarlane, D. B., Muller, D. R., Neal, H., Ratcliff, B. N., Roodman, A., Sullivan, M. K., Va'Vra, J., Wisniewski, W. J., Purohit, M. V., Wilson, J. R., Randle-Conde, A., Sekula, S. J., Ahmed, H., Tasneem, N., Bellis, M., Burchat, P. R., Puccio, E. M. T., Alam, M. S., Ernst, J. A., Gorodeisky, R., Guttman, N., Peimer, D. R., Soffer, A., Spanier, S. M., Ritchie, J. L., Schwitters, R. F., Izen, J. M., Lou, X. C., Bianchi, F., De Mori, F., Filippi, A., Gamba, D., Lanceri, L., Vitale, L., Martinez-Vidal, F., Oyanguren, A., Albert, J., Beaulieu, A., Bernlochner, F. U., King, G. J., Kowalewski, R., Lueck, T., Miller, C., Nugent, I. M., Roney, J. M., Sobie, R. J., Gershon, T. J., Harrison, P. F., Latham, T. E., Prepost, R., Wu, S. L., Mckenna, J A, Losecco, J M, and Macfarlane, D B more...
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flavor changing ,General Physics and Astronomy ,B meson ,High Energy Physics - Experiment ,current: constraint ,High Energy Physics - Experiment (hep-ex) ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,QC ,B meson decay ,scale: electroweak interaction ,article ,electron positron: colliding beams ,mass dependence ,The standard model ,Confidence level ,PEP-II ,axion-like particles ,axion: mass ,photon: pair production ,boson ,axionlike particles ,FOS: Physical sciences ,coupling constant: upper limit ,Bottom mesons ,electron positron: annihilation ,meson ,Physics::Geophysics ,BABAR experiment ,B: rare decay ,Bosons ,Electroweak boson ,axionlike particle ,High Energy Physics::Phenomenology ,ALPs ,Particle ma ,Upper limit ,Bottom meson ,Rare decays ,SLAC PEP Stor ,current ,axion: radiative decay ,HEP ,Electroweak scale ,Germanium compound ,Orders of magnitude ,Rare decay ,axion ,Hadron ,BaBar ,coupling: (axion 2photon) ,High Energy Physics::Experiment ,experimental results - Abstract
Axion-like particles (ALPs) are predicted in many extensions of the Standard Model, and their masses can naturally be well below the electroweak scale. In the presence of couplings to electroweak bosons, these particles could be emitted in flavor-changing $B$ meson decays. We report herein a search for an ALP, $a$, in the reaction $B^\pm\rightarrow K^\pm a$, $a\rightarrow\gamma\gamma$ using data collected by the BABAR experiment at SLAC. No significant signal is observed, and 90% confidence level upper limits on the ALP coupling to electroweak bosons are derived as a function of ALP mass, improving current constraints by several orders of magnitude in the range $0.175\,\,\mathrm{GeV} < m_a < 4.78\,\,\mathrm{GeV}$., Comment: 11 pages, 8 figures, submitted to Phys. Rev. Lett more...
- Published
- 2022
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37. Two dark matter candidates: the case of inert doublet and singlet scalars
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G. Bélanger, A. Mjallal, A. Pukhov, Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), and Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) more...
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Cherenkov Telescope Array ,scale: TeV ,dark matter: relic density ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,singlet: scalar ,tracks ,sensitivity ,doublet ,current: constraint ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,direct detection ,signature ,charged particle: stability - Abstract
We consider a multi-component dark matter model where the dark sector contains a scalar doublet and a complex scalar singlet. We impose a discrete $Z_4$ symmetry to ensure such that the lightest component of the doublet, $\tilde{A}$, and the singlet, $\tilde{S}$, are both stable. Interactions between the dark sectors impact significantly dark matter observables, they allow in particular to significantly relax the direct detection constraints on the model. To determine the parameter space that satisfies relic density, theoretical and collider constraints as well as direct and indirect detection limits, we perform two separate scans, the first includes the full parameter space of the model while the second is dedicated to scenarios with a compressed inert doublet spectrum. In the first case we find that the singlet is generally the dominant dark matter component while in the compressed case the doublet is more likely to be the dominant dark matter component. In both cases we find that the two dark matter particles can have masses that ranges from around $m_h/2$ to over the TeV scale. We emphasize the interplay between cosmological astrophysical and collider constraints and show that a large fraction of the parameter space that escapes current constraints is within the sensitivity reach of future detectors such as XENON-nT, Darwin or CTA. Important collider signatures are mostly found in the compressed spectrum case with the possibility of probing the model with searches for heavy stable charged particles and disappearing tracks. We also show that semi-annihilation processes such as $\tilde{S}\tilde{S}\to \tilde{A}Z$ could give the dominant signature in indirect detection searches., 44 pages, 24 figures more...
- Published
- 2021
38. Atacama Cosmology Telescope: Constraints on cosmic birefringence
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Michael D. Niemack, Mathew S. Madhavacheril, Sigurd Naess, J. Richard Bond, Adam D. Hincks, Neelima Sehgal, Kavilan Moodley, Loïc Maurin, Thibaut Louis, Joanna Dunkley, Grace E. Chesmore, Frank J. Qu, Omar Darwish, Johannes Hubmayr, Simone Aiola, Gene C. Hilton, Lyman A. Page, Toshiya Namikawa, Rolando Dünner, Maya Mallaby-Kay, C. Sifon, Mark J. Devlin, Patricio A. Gallardo, Daniel T. Becker, Amanda MacInnis, Alexander van Engelen, Renée Hložek, John P. Nibarger, Sara M. Simon, Emilie R. Storer, Matthew Hasselfield, Blake D. Sherwin, Kevin M. Huffenberger, Yilun Guan, Laura Newburgh, Vera Gluscevic, Arthur Kosowsky, Jeff Van Lanen, Edward J. Wollack, Anna E. Fox, Brian J. Koopman, Erminia Calabrese, Jeff McMahon, James A. Beall, Steve K. Choi, Alessandro Schillaci, Naomi Robertson, Nicholas Battaglia, Marius Lungu, John P. Hughes, Suzanne T. Staggs, David N. Spergel, Federico Nati, Dongwon Han, Namikawa, T, Guan, Y, Darwish, O, Sherwin, B, Aiola, S, Battaglia, N, Beall, J, Becker, D, Bond, J, Calabrese, E, Chesmore, G, Choi, S, Devlin, M, Dunkley, J, Dunner, R, Fox, A, Gallardo, P, Gluscevic, V, Han, D, Hasselfield, M, Hilton, G, Hincks, A, Hlozek, R, Hubmayr, J, Huffenberger, K, Hughes, J, Koopman, B, Kosowsky, A, Louis, T, Lungu, M, Macinnis, A, Madhavacheril, M, Mallaby-Kay, M, Maurin, L, Mcmahon, J, Moodley, K, Naess, S, Nati, F, Newburgh, L, Nibarger, J, Niemack, M, Page, L, Qu, F, Robertson, N, Schillaci, A, Sehgal, N, Sifon, C, Simon, S, Spergel, D, Staggs, S, Storer, E, Van Engelen, A, Van Lanen, J, Wollack, E, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut d'astrophysique spatiale (IAS), and Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) more...
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data analysis method ,cosmological model ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Cosmic microwave background ,cosmic background radiation: polarization ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,power spectrum ,01 natural sciences ,7. Clean energy ,Cosmology ,High Energy Physics - Experiment ,current: constraint ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,statistical analysis ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Cosmic Birefringence, CMB, Cosmology ,inflation ,010303 astronomy & astrophysics ,Axion ,Physics ,Birefringence ,birefringence ,010308 nuclear & particles physics ,Chern-Simons term ,photon ,coupling constant ,Polarization (waves) ,Massless particle ,High Energy Physics - Phenomenology ,Amplitude ,axion ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Atacama Cosmology Telescope ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Astrophysics - Cosmology and Nongalactic Astrophysics ,cosmic background radiation: anisotropy - Abstract
We present new constraints on anisotropic birefringence of the cosmic microwave background polarization using two seasons of data from the Atacama Cosmology Telescope covering $456$ square degrees of sky. The birefringence power spectrum, measured using a curved-sky quadratic estimator, is consistent with zero. Our results provide the tightest current constraint on birefringence over a range of angular scales between $5$ arcminutes and $9$ degrees. We improve previous upper limits on the amplitude of a scale-invariant birefringence power spectrum by a factor of between $2$ and $3$. Assuming a nearly-massless axion field during inflation, our result is equivalent to a $2\,\sigma$ upper limit on the Chern-Simons coupling constant between axions and photons of $g_{\alpha\gamma}, Comment: 18 pages, 3 figures, Accepted for publication in PRD more...
- Published
- 2020
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39. 计及线路优化投切限流的含风电电网扩展规划方法.
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董淑文, 刘宝柱, and 胡俊杰
- Abstract
Copyright of Electric Power is the property of Electric Power Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) more...
- Published
- 2023
- Full Text
- View/download PDF
40. Euclid: Forecast constraints on the cosmic distance duality relation with complementary external probes
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Jochen Weller, Rafael Toledo-Moreo, Frank Grupp, Stefano Camera, Enzo Branchini, M. Poncet, Ismael Tereno, A. Secroun, Lauro Moscardini, C. Padilla, F. Raison, Richard Massey, Knud Jahnke, Roberto P. Saglia, M. Frailis, Natalia Auricchio, T. Vassallo, Katarina Markovic, L. Popa, R. Cledassou, Ole Marggraf, Jason Rhodes, L. Conversi, Martin Kilbinger, V. Pettorino, M. Fumana, Luca Valenziano, Martin Kunz, Massimo Meneghetti, Niraj Welikala, Matteo Martinelli, Santiago Serrano, Massimo Brescia, Franck Sureau, P. B. Lilje, C. Bodendorf, Bianca Garilli, E. Franceschi, Stein Vidar Hagfors Haugan, F. Pasian, Stefano Cavuoti, Andrea Zacchei, I. Tutusaus, Hannu Kurki-Suonio, Thomas D. Kitching, V. Yankelevich, W. Holmes, Savvas Nesseris, Stéphane Paltani, G. Polenta, Ivan Lloro, Peter Schneider, Georges Meylan, Sandrine Pires, S. Ilić, S. Casas, J. Carretero, Carmelita Carbone, B. Gillis, Yu Wang, Marco Castellano, Carlos Martins, Lucia Pozzetti, D. Bonino, B. Kubik, C. Sirignano, Z. Sakr, Anne Ealet, Jarle Brinchmann, Mauro Roncarelli, A. N. Taylor, V. Capobianco, A. Balestra, F. Dubath, Domenico Sapone, Anastasios Avgoustidis, Leonardo Corcione, G. Sirri, S. Kermiche, Sebastiano Ligori, Felix Hormuth, Simona Mei, G. Congedo, Carlo Giocoli, Sami Niemi, La Caixa, Agencia Estatal de Investigación (España), European Commission, Fundação para a Ciência e a Tecnologia (Portugal), Fundación Severo Ochoa, Ministerio de Ciencia, Innovación y Universidades (España), Science and Technology Facilities Council (UK), Martinelli M., Martins C.J.A.P., Nesseris S., Sapone D., Tutusaus I., Avgoustidis A., Camera S., Carbone C., Casas S., Ilic S., Sakr Z., Yankelevich V., Auricchio N., Balestra A., Bodendorf C., Bonino D., Branchini E., Brescia M., Brinchmann J., Capobianco V., Carretero J., Castellano M., Cavuoti S., Cledassou R., Congedo G., Conversi L., Corcione L., Dubath F., Ealet A., Frailis M., Franceschi E., Fumana M., Garilli B., Gillis B., Giocoli C., Grupp F., Haugan S.V.H., Holmes W., Hormuth F., Jahnke K., Kermiche S., Kilbinger M., Kitching T.D., Kubik B., Kunz M., Kurki-Suonio H., Ligori S., Lilje P.B., Lloro I., Marggraf O., Markovic K., Massey R., Mei S., Meneghetti M., Meylan G., Moscardini L., Niemi S., Padilla C., Paltani S., Pasian F., Pettorino V., Pires S., Polenta G., Poncet M., Popa L., Pozzetti L., Raison F., Rhodes J., Roncarelli M., Saglia R., Schneider P., Secroun A., Serrano S., Sirignano C., Sirri G., Sureau F., Taylor A.N., Tereno I., Toledo-Moreo R., Valenziano L., Vassallo T., Wang Y., Welikala N., Weller J., Zacchei A., Department of Physics, Helsinki Institute of Physics, Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112)), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7), Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique (LERMA (UMR_8112)), Sorbonne Université (SU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL), Institut de recherche en astrophysique et planétologie (IRAP), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Centre National d'Études Spatiales [Toulouse] (CNES), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), EUCLID, ITA, USA, GBR, FRA, DEU, ESP, Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Cergy Pontoise (UCP), Université Paris-Seine-Université Paris-Seine-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Martinelli, M., Martins, C. J. A. P., Nesseris, S., Sapone, D., Tutusaus, I., Avgoustidis, A., Camera, S., Carbone, C., Casas, S., Ilic, S., Sakr, Z., Yankelevich, V., Auricchio, N., Balestra, A., Bodendorf, C., Bonino, D., Branchini, E., Brescia, M., Brinchmann, J., Capobianco, V., Carretero, J., Castellano, M., Cavuoti, S., Cledassou, R., Congedo, G., Conversi, L., Corcione, L., Dubath, F., Ealet, A., Frailis, M., Franceschi, E., Fumana, M., Garilli, B., Gillis, B., Giocoli, C., Grupp, F., Haugan, S. V. H., Holmes, W., Hormuth, F., Jahnke, K., Kermiche, S., Kilbinger, M., Kitching, T. D., Kubik, B., Kunz, M., Kurki-Suonio, H., Ligori, S., Lilje, P. B., Lloro, I., Marggraf, O., Markovic, K., Massey, R., Mei, S., Meneghetti, M., Meylan, G., Moscardini, L., Niemi, S., Padilla, C., Paltani, S., Pasian, F., Pettorino, V., Pires, S., Polenta, G., Poncet, M., Popa, L., Pozzetti, L., Raison, F., Rhodes, J., Roncarelli, M., Saglia, R., Schneider, P., Secroun, A., Serrano, S., Sirignano, C., Sirri, G., Sureau, F., Taylor, A. N., Tereno, I., Toledo-Moreo, R., Valenziano, L., Vassallo, T., Wang, Y., Welikala, N., Weller, J., and Zacchei, A. more...
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cosmological model ,Cosmological parameter ,statistical [Methods] ,SAMPLE ,Physics beyond the Standard Model ,Cosmological parameters ,Cosmology: observations ,Methods: data analysis ,Methods: statistical ,Space vehicles: instruments ,Surveys ,Astrophysics ,01 natural sciences ,INTERGALACTIC DUST ,Cosmology: observation ,current: constraint ,parameter space ,space vehicles: instruments ,observations [Cosmology] ,data analysis [Methods] ,010303 astronomy & astrophysics ,SCALE ,Parametric statistics ,Physics ,new physics ,photon ,EXPANSION ,GALAXIES ,Metric (mathematics) ,astro-ph.CO ,duality ,Baryon acoustic oscillations ,cosmology: observations / cosmological parameters / surveys / methods: data analysis / methods: statistical / space vehicles: instruments ,Algorithm ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,REDSHIFT ,Duality (optimization) ,FOS: Physical sciences ,observation [Cosmology] ,Context (language use) ,Lambda-CDM model ,gravitation: metric ,parametric ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Space vehicles: instrument ,instruments [Space vehicles] ,statistical analysis ,instrument [Space vehicles] ,0103 physical sciences ,conservation law ,Point (geometry) ,cosmological parameters ,010308 nuclear & particles physics ,Astronomy and Astrophysics ,MICROWAVE BACKGROUND TEMPERATURE ,115 Astronomy, Space science ,methods: data analysis ,data analysi [Methods] ,Space and Planetary Science ,cosmology: observations ,COSMOLOGY ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,BARYON ACOUSTIC-OSCILLATIONS ,Methods: data analysi - Abstract
[Context] In metric theories of gravity with photon number conservation, the luminosity and angular diameter distances are related via the Etherington relation, also known as the distance duality relation (DDR). A violation of this relation would rule out the standard cosmological paradigm and point to the presence of new physics. Aims. We quantify the ability of Euclid, in combination with contemporary surveys, to improve the current constraints on deviations from the DDR in the redshift range 0 < z < 1.6., [Methods] We start with an analysis of the latest available data, improving previously reported constraints by a factor of 2.5. We then present a detailed analysis of simulated Euclid and external data products, using both standard parametric methods (relying on phenomenological descriptions of possible DDR violations) and a machine learning reconstruction using genetic algorithms., [Results] We find that for parametric methods Euclid can (in combination with external probes) improve current constraints by approximately a factor of six, while for non-parametric methods Euclid can improve current constraints by a factor of three.; [Conclusions] Our results highlight the importance of surveys like Euclid in accurately testing the pillars of the current cosmological paradigm and constraining physics beyond the standard cosmological model., MM has received the support of a fellowship from “la Caixa” Foundation (ID 100010434), with fellowship code LCF/BQ/PI19/11690015, and the support of the Spanish Agencia Estatal de Investigacion through the grant “IFT Centro de Excelencia Severo Ochoa SEV-2016-0597”. The work of CJM was financed by FEDER – Fundo Europeu de Desenvolvimento Regional funds through the COMPETE 2020 – Operational Programme for Competitiveness and Internationalisation (POCI), and by Portuguese funds through FCT - Fundação para a Ciência e a Tecnologia in the framework of the project POCI-01-0145-FEDER-028987. S.N. acknowledges support from the research project PGC2018-094773-B-C32, the Centro de Excelencia Severo Ochoa Program SEV-2016-059 and the Ramón y Cajal program through Grant No. RYC-2014-15843. D.S. acknowledges financial support from the Fondecyt Regular project number 1200171. I.T. acknowledges support from the Spanish Ministry of Science, Innovation and Universities through grant ESP2017-89838-C3-1-R, and the H2020 programme of the European Commission through grant 776247. A.A. acknowledges support from the Science and Technology Facilities Council (STFC) grant ST/P000703/1. V.Y. acknowledges funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement No. 769130) more...
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- 2020
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41. LHC-friendly minimal freeze-in models
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Alexander Pukhov, Jose Miguel No, Dipan Sengupta, Nishita Desai, Bryan Zaldivar, José Zurita, Andre Lessa, Geneviève Bélanger, J. Harz, Sezen Sekmen, Andreas Goudelis, Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Univers et Particules de Montpellier (LUPM), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Institut Lagrange de Paris, Sorbonne Université (SU), UAM. Departamento de Física Teórica, Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM), Université de Montpellier (UM)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Sorbonne Universités more...
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Nuclear and High Energy Physics ,Particle physics ,interpretation of experiments: CERN LHC Coll ,lepton ,Dark matter ,FOS: Physical sciences ,quantum number ,baryogenesis ,7. Clean energy ,01 natural sciences ,High Energy Physics - Experiment ,current: constraint ,High Energy Physics - Experiment (hep-ex) ,particle: massive ,High Energy Physics - Phenomenology (hep-ph) ,0103 physical sciences ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,ddc:530 ,010306 general physics ,lifetime ,Physics ,leptogenesis ,Large Hadron Collider ,010308 nuclear & particles physics ,dark matter: relic density ,High Energy Physics::Phenomenology ,Física ,tracks ,Cosmology of Theories beyond the SM ,Quantum number ,Charged particle ,ddc ,Baryogenesis ,High Energy Physics - Phenomenology ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,Leptogenesis ,Beyond Standard Model ,lcsh:QC770-798 ,Particle ,luminosity: high ,particle: long-lived ,signature ,charged particle: stability ,Lepton - Abstract
We propose simple freeze-in models where the observed dark matter abundance is explained via the decay of an electrically charged and/or coloured parent particle into Feebly Interacting Massive Particles (FIMP). The parent particle is long-lived and yields a wide variety of LHC signatures depending on its lifetime and quantum numbers. We assess the current constraints and future high luminosity reach of these scenarios at the LHC from searches for heavy stable charged particles, disappearing tracks, displaced vertices and displaced leptons. We show that the LHC constitutes a powerful probe of freeze-in dark matter and can further provide interesting insights on the validity of vanilla baryogenesis and leptogenesis scenarios. more...
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- 2019
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42. Self-Switching Wireless Power Transfer System Design with Constant Current/Constant Voltage Output Features Based on LCC-LCL/S Topology.
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Song, Tingting, Huang, Wencong, Rao, Tianbiao, Chang, Yufang, and Yan, Huaicheng
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WIRELESS power transmission ,SYSTEMS design ,VOLTAGE ,TOPOLOGY - Abstract
To meet the demand for constant current and constant voltage charging of batteries and to increase the system output power, the LCC-LCL/S-type self-switching wireless power transfer system is proposed. The system does not require communication between the primary and secondary circuits, and its output mode is controlled by simply changing the status of two switches on the secondary side. Notably, the system satisfies the zero phase angle characteristic before and after mode switching. The parameter design method is proposed based on the circuit topology and the maximum safe current constraint. To make the output voltage fluctuation as small as possible, the optimum load switching point for the system has been designed, and its optimality has been validated by simulation. Furthermore, the switching control strategy is proposed, considering the effects of the system no-load and load short-circuit in real situations. Finally, an experimental platform was built to achieve the high efficiency output of the system with the maximum output voltage of 46.21 V, the maximum output power of 180 W, and the maximum efficiency of 93.4%, which verified the applicability of the proposed method. [ABSTRACT FROM AUTHOR] more...
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- 2024
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43. A Path Planning Method for Unmanned Surface Vessels in Dynamic Environment.
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Yu, Jiabin, Chen, Zhihao, Zhao, Zhiyao, Xu, Jiping, and Lu, Yang
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A path planning method for unmanned surface vessels (USV) in dynamic environment is proposed to address the impact of dynamic environments on path planning results and the lack of dynamic obstacle avoidance capabilities. First, the considering ocean current rapidly exploring random tree (RRT*) (COC-RRT*) algorithm was proposed for global path planning. The RRT* algorithm has been enhanced with the integration of the virtual field sampling algorithm and ocean current constraint algorithm. The COC-RRT* algorithm optimizes the global planning path by adjusting the path between the parent nodes and child nodes. Second, according to the limitations of the International Regulations for Preventing Collisions at Sea (COLREGs), the improved dynamic window approach (DWA) is applied for local path planning. To enhance the ability of avoid dynamic obstacles, the dist function in the DWA algorithm has been improved. Simulation experiments were conducted in three scenarios to validate the proposed algorithm. The experimental results demonstrate that, in comparison with other algorithms, the proposed algorithm effectively avoids dynamic obstacles and mitigates the influence of the space-varying ocean current environment on the path-planning outcome. Additionally, the proposed algorithm exhibits high efficiency and robustness. The results verified the effectiveness of the proposed algorithm in dynamic environments. [ABSTRACT FROM AUTHOR] more...
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- 2024
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44. Battery Energy Storage System Performance in Providing Various Electricity Market Services.
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Jaffal, Hussein, Guanetti, Leopoldo, Rancilio, Giuliano, Spiller, Matteo, Bovera, Filippo, and Merlo, Marco
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BATTERY storage plants ,ELECTRICITY markets ,INTERNAL rate of return ,BID price ,CAPITAL investments - Abstract
The Battery Energy Storage System (BESS) is one of the possible solutions to overcoming the non-programmability associated with these energy sources. The capabilities of BESSs to store a consistent amount of energy and to behave as a load by releasing it ensures an essential source of flexibility to the power system. Nevertheless, BESSs have some drawbacks that pose limitations to their utilization. Indeed, effectively managing the stored and released energy is crucial, considering the degradation of performance associated with these systems over time. The substantial capital expenditure (CAPEX) required to install these systems represents a current constraint, impeding their broader adoption. This work evaluates a techno-economic analysis of a 2MW/2MWh BESS providing multiple services, namely participating in capacity and balance markets. The analysis is based on a BESS model implemented in SIMULINK, adopting online data gathered from a Lithium Iron Phosphate (LFP) battery facility. The model evaluates the auxiliary power consumption, state-of-charge (SoC), state of health (SoH), and the round-trip efficiency (RTE) of the overall system. The analysis is based on three price profiles: 2019 (Business-As-Usual), 2020 (COVID-19), and 2022 (Gas Crisis). Furthermore, this work conducts a case study to analyze the behavior of the BESS. It entails a sensitivity analysis, specifically evaluating the influence of CAPEX and upward bid price on the economic viability of the project. The results show a strong relation between the CAPEX variation and the Internal Rate of Return (IRR) of the project. [ABSTRACT FROM AUTHOR] more...
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- 2024
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45. Exploring cosmic origins with CORE: cosmological parameters
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Daniela Paoletti, Nicola Bartolo, Jens Chluba, J. Greenslade, P. Vielva, Mattia Negrello, Karl Young, Matteo Bonato, Andrea Tartari, Alessandro Paiella, Alessandro Coppolecchia, Andrea Caputo, Nicola Vittorio, V. Lindholm, Anthony Challinor, Agnieszka Pollo, Francois Boulanger, Luca Lamagna, Simone Ferraro, Martin Crook, D. McCarthy, M. López-Caniego, Ted Kisner, G. de Gasperis, L. Polastri, Alessandro Melchiorri, Josquin Errard, Rien van de Weygaert, D. Tramonte, Jose Alberto Rubino-Martin, C. J. A. P. Martins, Deanna C. Hooper, Matthieu Roman, Gianfranco De Zotti, Neil Trappe, M. Piat, Daniel Baumann, Gianluca Polenta, Jussi Valiviita, M. Tomasi, Paolo de Bernardis, Christophe Ringeval, Marco De Petris, Marco Bersanelli, Mario Zannoni, Giuseppe D'Alessandro, R. Fernandez-Cobos, Julien Lesgourgues, Paolo Natoli, Laura Salvati, Miguel Quartin, Thomas Kitching, R. Allison, Antony Lewis, K. Kiiveri, Carole Tucker, Diego Molinari, M. Kunz, Joseph J. Mohr, Ricardo Genova-Santos, C. Hervias-Caimapo, Jean-Baptiste Melin, Sebastian Grandis, Sylvain Martin, Michele Liguori, Shaul Hanany, Mario Ballardini, Vincent Vennin, Eleonora Di Valentino, Enrique Martinez-Gonzalez, Jose M. Diego, Giovanni Cabass, Hannu Kurki-Suonio, Jacques Delabrouille, J. González-Nuevo, Anthony Lasenby, F. Piacentini, Jochem J. A. Baselmans, Gemma Luzzi, S. Hagstotz, Tiziana Trombetti, Stephen M. Feeney, Alessio Notari, C. S. Carvalho, Fabio Finelli, Simone Paradiso, Silvia Masi, James G. Bartlett, Carlos Hernández-Monteagudo, Massimiliano Lattanzi, A. J. Banday, Thejs Brinckmann, Cora Dvorkin, Eric Hivon, Sebastien Clesse, Alessandro Buzzelli, Vivian Poulin, Ana Achúcarro, Martina Gerbino, M. Ashdown, A. Bonaldi, Luca Pagano, Julian Borrill, Will Handley, Martino Calvo, R. Banerji, Ivan Charles, Alessandro Monfardini, Frederico Arroja, S. Basak, Mathieu Remazeilles, Giampaolo Pisano, I. Colantoni, Silvia Galli, Gérard Vermeulen, Francesco Forastieri, Elena Giusarma, Dhiraj Kumar Hazra, François R. Bouchet, Zhen-Yi Cai, Carlo Burigana, G. Castellano, Peter A. R. Ade, Matthew Hills, Bruno Maffei, Martin Bucher, Bartjan van Tent, Guillaume Patanchon, Helsinki Institute of Physics, Department of Physics, String Theory (ITFA, IoP, FNWI), Astronomy, Institut d'Astrophysique de Paris ( IAP ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Institut Lagrange de Paris, Sorbonne Universités, Laboratoire d'Annecy-le-Vieux de Physique Théorique ( LAPTH ), Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Institut d'astrophysique spatiale ( IAS ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de recherche en astrophysique et planétologie ( IRAP ), Université Paul Sabatier - Toulouse 3 ( UPS ) -Observatoire Midi-Pyrénées ( OMP ) -Centre National de la Recherche Scientifique ( CNRS ), Département de Recherche Fondamentale sur la Matière Condensée ( DRFMC ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), Département de Physique des Particules (ex SPP) ( DPP ), Institut de Recherches sur les lois Fondamentales de l'Univers ( IRFU ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Université Paris-Saclay, Institut Néel ( NEEL ), Université Grenoble Alpes [Saint Martin d'Hères]-Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Nucléaire et de Hautes Énergies ( LPNHE ), Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de Physique Théorique d'Orsay [Orsay] ( LPT ), Université Paris-Sud - Paris 11 ( UP11 ) -Centre National de la Recherche Scientifique ( CNRS ), CORE, Di Valentino, E, Brinckmann, T, Gerbino, M, Poulin, V, Bouchet, F, Lesgourgues, J, Melchiorri, A, Chluba, J, Clesse, S, Delabrouille, J, Dvorkin, C, Forastieri, F, Galli, S, Hooper, D, Lattanzi, M, Martins, C, Salvati, L, Cabass, G, Caputo, A, Giusarma, E, Hivon, E, Natoli, P, Pagano, L, Paradiso, S, Rubiño-Martin, J, Achúcarro, A, Ade, P, Allison, R, Arroja, F, Ashdown, M, Ballardini, M, Banday, A, Banerji, R, Bartolo, N, Bartlett, J, Basak, S, Baumann, D, de Bernardis, P, Bersanelli, M, Bonaldi, A, Bonato, M, Borrill, J, Boulanger, F, Bucher, M, Burigana, C, Buzzelli, A, Cai, Z, Calvo, M, Carvalho, C, Castellano, G, Challinor, A, Charles, I, Colantoni, I, Coppolecchia, A, Crook, M, D'Alessandro, G, De Petris, M, De Zotti, G, Diego, J, Errard, J, Feeney, S, Fernandez-Cobos, R, Ferraro, S, Finelli, F, de Gasperis, G, Génova-Santos, R, González-Nuevo, J, Grandis, S, Greenslade, J, Hagstotz, S, Hanany, S, Handley, W, Hazra, D, Hernández-Monteagudo, C, Hervias-Caimapo, C, Hills, M, Kiiveri, K, Kisner, T, Kitching, T, Kunz, M, Kurki-Suonio, H, Lamagna, L, Lasenby, A, Lewis, A, Liguori, M, Lindholm, V, Lopez-Caniego, M, Luzzi, G, Maffei, B, Martin, S, Martinez-Gonzalez, E, Masi, S, Matarrese, S, Mccarthy, D, Melin, J, Mohr, J, Molinari, D, Monfardini, A, Negrello, M, Notari, A, Paiella, A, Paoletti, D, Patanchon, G, Piacentini, F, Piat, M, Pisano, G, Polastri, L, Polenta, G, Pollo, A, Quartin, M, Remazeilles, M, Roman, M, Ringeval, C, Tartari, A, Tomasi, M, Tramonte, D, Trappe, N, Trombetti, T, Tucker, C, Väliviita, J, van de Weygaert, R, Van Tent, B, Vennin, V, Vermeulen, G, Vielva, P, Vittorio, N, Young, K, Zannoni, M, Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Annecy-le-Vieux de Physique Théorique (LAPTH), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Institut d'astrophysique spatiale (IAS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Observatoire Midi-Pyrénées (OMP), Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS), Département de Recherche Fondamentale sur la Matière Condensée (DRFMC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département de Physique des Particules (ex SPP) (DPP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Néel (NEEL), Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE (UMR_7585)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Théorique d'Orsay [Orsay] (LPT), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales [Paris] (CNES), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Cryogénie (NEEL - Cryo), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Département de Physique des Particules (ex SPP) (DPhP), Hélium : du fondamental aux applications (NEEL - HELFA), Sorbonne Université (SU), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut national des sciences de l'Univers (INSU - CNRS)-Université Toulouse III - Paul Sabatier (UT3), Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Université Fédérale Toulouse Midi-Pyrénées-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Météo France-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Centre National de la Recherche Scientifique (CNRS), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), and Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11) more...
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gravitation: model ,[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] ,Cosmic microwave background ,cosmological parameters from CMBR, CMBR experiments, neutrino masses from cosmology ,BACKGROUND ANISOTROPIES ,cosmic background radiation: polarization ,Astrophysics ,baryon: oscillation: acoustic ,NEUTRINO MASS ,01 natural sciences ,COBE FIRAS INSTRUMENT ,current: constraint ,DESI ,High Energy Physics - Phenomenology (hep-ph) ,CMBR experiments ,CMB POLARIZATION ,dark energy ,010303 astronomy & astrophysics ,general relativity and quantum cosmology ,QC ,cosmological parameters from CMBR ,neutrino masses from cosmology ,media_common ,helium: primordial ,QB ,Physics ,birefringence ,hep-th ,formation ,Astrophysics::Instrumentation and Methods for Astrophysics ,hep-ph ,TEMPERATURE-REDSHIFT RELATION ,high energy physics - theory ,inflation: model ,high energy physics - phenomenology ,curvature ,symbols ,astro-ph.CO ,CMBR experiment ,FUNDAMENTAL CONSTANTS ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,satellite: Planck ,ANGULAR POWER SPECTRUM ,Primordial fluctuations ,media_common.quotation_subject ,gr-qc ,Dark matter ,satellite ,FOS: Physical sciences ,General Relativity and Quantum Cosmology (gr-qc) ,Astrophysics::Cosmology and Extragalactic Astrophysics ,NO ,BROKEN LEPTON NUMBER ,symbols.namesake ,FIS/05 - ASTRONOMIA E ASTROFISICA ,Settore FIS/05 - Astronomia e Astrofisica ,FINE-STRUCTURE CONSTANT ,0103 physical sciences ,ionization ,LARGE-SCALE STRUCTURE ,structure ,Planck ,Reionization ,PROBING NEUTRINO MASSES ,Inflation (cosmology) ,010308 nuclear & particles physics ,fluctuation: primordial ,Astronomy and Astrophysics ,dark matter: annihilation ,sensitivity ,115 Astronomy, Space science ,MICROWAVE-ANISOTROPY-PROBE ,Universe ,recombination ,COLD DARK-MATTER ,High Energy Physics - Theory (hep-th) ,13. Climate action ,Dark energy ,DIGITAL SKY SURVEY ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,MICROWAVE BACKGROUND POLARIZATION - Abstract
We forecast the main cosmological parameter constraints achievable with the CORE space mission which is dedicated to mapping the polarisation of the Cosmic Microwave Background (CMB). CORE was recently submitted in response to ESA's fifth call for medium-sized mission proposals (M5). Here we report the results from our pre-submission study of the impact of various instrumental options, in particular the telescope size and sensitivity level, and review the great, transformative potential of the mission as proposed. Specifically, we assess the impact on a broad range of fundamental parameters of our Universe as a function of the expected CMB characteristics, with other papers in the series focusing on controlling astrophysical and instrumental residual systematics. In this paper, we assume that only a few central CORE frequency channels are usable for our purpose, all others being devoted to the cleaning of astrophysical contaminants. On the theoretical side, we assume LCDM as our general framework and quantify the improvement provided by CORE over the current constraints from the Planck 2015 release. We also study the joint sensitivity of CORE and of future Baryon Acoustic Oscillation and Large Scale Structure experiments like DESI and Euclid. Specific constraints on the physics of inflation are presented in another paper of the series. In addition to the six parameters of the base LCDM, which describe the matter content of a spatially flat universe with adiabatic and scalar primordial fluctuations from inflation, we derive the precision achievable on parameters like those describing curvature, neutrino physics, extra light relics, primordial helium abundance, dark matter annihilation, recombination physics, variation of fundamental constants, dark energy, modified gravity, reionization and cosmic birefringence. (ABRIDGED), Comment: 90 pages, 25 Figures. Revised version with new authors list and references more...
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- 2018
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46. Return of Harrison–Zeldovich spectrum in light of recent cosmological tensions.
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Jiang, Jun-Qian, Ye, Gen, and Piao, Yun-Song
- Subjects
INFLATIONARY universe ,SURFACE scattering ,DARK matter ,SET theory ,UNIVERSE - Abstract
The spectral index n
s of scalar perturbation is the significant initial condition set by inflation theory for our observable Universe. According to Planck results, current constraint is ns = 0.965 ± 0.004, while an exact scale-invariant Harrison–Zeldovich spectrum, i.e. ns = 1, has been ruled out at 8.4σ significance level. However, it is well-known that the standard Lambda cold dark matter model is suffering from the Hubble tension, which is at ∼5σ significance level. This inconsistency likely indicates that the comoving sound horizon at last scattering surface is actually lower than expected, which so seems to be calling for the return of ns = 1. Here, in light of recent observations we find strong evidence for a ns = 1 universe. And we show that if so, it would be confirmed conclusively by CMB-S4 experiment. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
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47. Top-philic dark matter within and beyond the WIMP paradigm
- Author
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Garny, Mathias, Heisig, Jan, Hufnagel, Marco, and Lülf, Benedikt
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Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,exceptional ,R-hadron ,long-lived ,WIMP ,single production [jet] ,top: mass ,FOS: Physical sciences ,constraint [current] ,GLAST ,current: constraint ,High Energy Physics - Phenomenology (hep-ph) ,ddc:530 ,mediation ,colored particle ,relic density ,coupling constant ,dark matter: freeze-out ,jet: single production ,freeze-out [dark matter] ,High Energy Physics - Phenomenology ,CERN LHC Coll ,invisible decay ,mass [top] ,simplex ,signature ,Astrophysics - Cosmology and Nongalactic Astrophysics ,Majorana - Abstract
Physical review / D 97(7), 075002 (2018). doi:10.1103/PhysRevD.97.075002, We present a comprehensive analysis of top-philic Majorana dark matter that interacts via a colored t-channel mediator. Despite the simplicity of the model -- introducing three parameters only -- it provides an extremely rich phenomenology allowing to accommodate the relic density for a large range of coupling strengths spanning over six orders of magnitude. This model features all exceptional mechanisms for dark matter freeze-out, including the recently discovered conversion-driven freeze-out mode, with interesting signatures of long-lived colored particles at colliders. We constrain the cosmologically allowed parameter space with current experimental limits from direct, indirect and collider searches, with special emphasis on light dark matter below the top mass. In particular, we explore the interplay between limits from Xenon1T, Fermi-LAT and AMS-02 as well as limits from stop, monojet and Higgs invisible decay searches at the LHC. We find that several blind spots for light dark matter evade current constraints. The region in parameter space where the relic density is set by the mechanism of conversion-driven freeze-out can be conclusively tested by R-hadron searches at the LHC with 300 fb$^{-1}$., Published by APS, Woodbury, NY more...
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- 2018
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48. Adaptive Neural Asymptotic Tracking Control for PMSM Systems Under Current Constraints and Unknown Dynamics
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Zhang, Jianyi, Ren, Wei, Li, Jingjie, and Sun, Xi-Ming
- Abstract
In this brief, an adaptive neural asymptotic tracking control (ANATC) scheme is developed for permanent magnet synchronous motor (PMSM) systems under current constraints and unknown dynamics. More specifically, a system transformation strategy is first introduced to handle the current constraint, and is applied to embed the constraint condition into the transformed system through nonlinear mapping. In this way, it is unnecessary to study the current constraint independently, thus facilitating the design of the control scheme. In addition, the neural networks (NNs) are applied to approximate the unknown dynamics, and only require updating one parameter online. Based on the system transformation strategy and the NN approximator, an ANATC scheme is developed to establish the asymptotic tracking performance without steady-state error. Finally, hardware experiments are presented to illustrate the performance of the ANATC scheme. more...
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- 2024
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49. Probing new physics with atmospheric neutrinos at KM3NeT-ORCA
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Joao A B Coelho, Université Paris Diderot - Paris 7 (UPD7), AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), KM3NeT, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) more...
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History ,Particle physics ,Physics beyond the Standard Model ,FOS: Physical sciences ,forward scattering ,7. Clean energy ,01 natural sciences ,High Energy Physics - Experiment ,Education ,current: constraint ,High Energy Physics - Experiment (hep-ex) ,High Energy Physics - Phenomenology (hep-ph) ,neutrino: atmosphere ,0103 physical sciences ,new interaction ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,010306 general physics ,Physics ,010308 nuclear & particles physics ,new physics: search for ,talk: London 2016/07/04 ,High Energy Physics::Phenomenology ,matter: effect ,suppression ,neutrino: sterile ,sensitivity ,Computer Science Applications ,coherence ,High Energy Physics - Phenomenology ,KM3NeT ,[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph] ,High Energy Physics::Experiment ,neutrino: oscillation ,Neutrino ,neutrino: mixing ,experimental results - Abstract
We present the prospects of ORCA searches for new physics phenomena using atmospheric neutrinos. Focus is given to exploiting the impact of strong matter effects on the oscillation of atmospheric neutrinos in light of expanded models, such as sterile neutrinos and non-standard interactions. In the presence of light sterile neutrinos that mix with active neutrinos, additional resonances and suppressions may occur at different energies. One may also use neutrino oscillations to probe the properties of the coherent forward scattering which may be altered by new interactions beyond the Standard Model. Preliminary studies show that ORCA would be able to probe some parameters of these models with sensitivity up to one order of magnitude better than current constraints., 3 pages, 2 figures, Proceedings of the 27th International Conference on Neutrino Physics and Astrophysics (Neutrino 2016), to appear in the Journal of Physics: Conference Series (JPCS) more...
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- 2016
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50. Neutrinos from Clusters of Galaxies and Radio Constraints
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Shin'ichiro Ando, Stefano Gabici, Fabio Zandanel, Irene Tamborra, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), AstroParticule et Cosmologie ( APC - UMR 7164 ), Centre National de la Recherche Scientifique ( CNRS ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ), String Theory (ITFA, IoP, FNWI), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) more...
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Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Proton ,gamma ray: background ,[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] ,Astrophysics::High Energy Astrophysical Phenomena ,FOS: Physical sciences ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,power spectrum ,neutrino: flux ,IceCube ,current: constraint ,Observatory ,synchrotron ,Galaxy cluster ,Physics ,High Energy Astrophysical Phenomena (astro-ph.HE) ,Spectral index ,particle: energy ,electron: secondary ,neutrino: background ,tension ,Galaxy ,observatory ,13. Climate action ,cosmic radiation ,stacking ,Spectral energy distribution ,spectral ,galaxy: cluster ,Neutrino ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,Astrophysics - High Energy Astrophysical Phenomena ,Fermi Gamma-ray Space Telescope ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
Cosmic-ray (CR) protons can accumulate for cosmological times in clusters of galaxies. Their hadronic interactions with protons of the intra-cluster medium (ICM) generate secondary electrons, gamma-rays and high-energy neutrinos. In light of the high-energy neutrino events recently discovered by the IceCube observatory, we estimate the contribution from galaxy clusters to the diffuse gamma-ray and neutrino backgrounds. For the first time, we consistently take into account the synchrotron emission generated by secondary electrons and require the clusters radio counts to be respected. For a choice of parameters respecting current constraints from radio to gamma-rays, and assuming a proton spectral index of -2, we find that hadronic interactions in clusters contribute by less than 10% to the IceCube flux, and much less to the total extragalactic gamma-ray background observed by Fermi. They account for less than 1% for spectral indexes -2 is adopted. However, this scenario is in tension with the high-energy IceCube data, which seem to suggest a spectral energy distribution of the neutrino flux that decreases with the particle energy. We stress that our results are valid for all kind of sources injecting CR protons into the ICM, and that, while IceCube can test the most optimistic scenarios for spectral indexes >=-2.2 by stacking few nearby massive objects, clusters of galaxies cannot give any relevant contribution to the extragalactic gamma-ray and neutrino backgrounds in any realistic scenario., Comment: To appear in the proceedings of the 34th International Cosmic Ray Conference (ICRC 2015, The Hague, The Netherlands). Content based on the paper A&A, 578, A32, 2015 (arXiv:1410.8697) more...
- Published
- 2015
- Full Text
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