138 results on '"Maximal energy"'
Search Results
2. On energy ordering of vertex-disjoint bicyclic sidigraphs
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Sumaira Hafeez and Rashid Farooq
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signed digraphs ,energy ordering ,maximal energy ,Mathematics ,QA1-939 - Abstract
The energy and iota energy of signed digraphs are respectively defined by $E(S)=$ $\sum_{k=1}^n|{\rm Re}(\rho_k)|$ and $E_c(S)=\sum_{k=1}^n|{\rm Im }(\rho_k)|$, where $\rho_1, \dots,\rho_n$ are eigenvalues of $S$, and ${\rm Re}(\rho_k)$ and ${\rm Im}(\rho_k)$ are respectively real and imaginary values of the eigenvalue $\rho_k$. Recently, Yang and Wang (2018) found the energy and iota energy ordering of digraphs in $\mathcal{D}_n$ and computed the maximal energy and iota energy, where $\mathcal{D}_n$ denotes the set of vertex-disjoint bicyclic digraphs of a fixed order $n$. In this paper, we investigate the energy ordering of signed digraphs in $\mathcal{D}_n^s$ and find the maximal energy, where $\mathcal{D}_n^s$ denotes the set of vertex-disjoint bicyclic sidigraphs of a fixed order $n$.
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- 2020
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3. Resonances over a potential well in an island.
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Sjöstrand, Johannes and Zerzeri, Maher
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Copyright of Arkiv foer Matematik is the property of International Press of Boston 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.)
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- 2021
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4. Bicyclic signed graphs with at most one odd cycle and maximal energy.
- Author
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Wang, Dijian and Hou, Yaoping
- Subjects
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CYCLES , *EIGENVALUES - Abstract
Let x 1 , x 2 , ... , x n be the eigenvalues of a signed graph Γ of order n. The energy of Γ is defined as E (Γ) = ∑ j = 1 n | x j |. Let P n 4 , 4 be the signed graph obtained from two copies of negative cycles (C 4 , σ ¯) joined by a path P n − 6. In this paper, we show that P n 4 , 4 has the maximal energy among all n -vertices connected bicyclic signed graphs with at most one odd cycle. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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5. Mécanismes sous-jacents à la fatigue chronique, un symptôme trop souvent négligé
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Alain Trautmann
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0303 health sciences ,medicine.medical_specialty ,business.industry ,Adrenal gland ,Inflammation ,Stimulation ,Chronic fatigue ,General Medicine ,General Biochemistry, Genetics and Molecular Biology ,Fight-or-flight response ,03 medical and health sciences ,0302 clinical medicine ,Maximal energy ,Endocrinology ,medicine.anatomical_structure ,Hypothalamus ,Internal medicine ,medicine ,medicine.symptom ,business ,030217 neurology & neurosurgery ,030304 developmental biology - Abstract
L’activation de l’hypothalamus par des signaux inflammatoires et/ou de stress peut déclencher celle de l’axe HPA (hypothalamic-pituitary-adrenal axis), qui intègre l’hypothalamus, l’hypophyse et la glande surrénale. L’activation aiguë de l’axe HPA est fondamentale pour la réponse fight or flight (« combats ou fuis »). Elle permet de mobiliser un maximum d’énergie pour un effort, tout en effaçant la fatigue. En revanche, son activation chronique diminue l’efficacité musculaire et entraîne une fatigue chronique. On discutera dans cette partie de plusieurs points stratégiques à considérer pour tenter de comprendre et de traiter ensemble inflammation et fatigue chroniques.
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- 2021
6. The minimal and maximal energies of all cubic circulant graphs
- Author
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Kerem Kaskaloglu, Alper Bulut, and Ilhan Hacioglu
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minimal energy ,taylor expansion ,3-circulant graphs ,möbius ladder graph ,cubic graphs ,trivalent graphs ,Combinatorics ,prism graph ,maximal energy ,QA1-939 ,Discrete Mathematics and Combinatorics ,Circulant matrix ,Mathematics - Abstract
In recent article, Zhou and Zhou conjectured that among cubic circulant graphs with n vertices the maximum energy occurs whenever the largest number of components is attained. In this article, first we compute the upper and lower bounds for the energies of the isomorphic copies of Möbius ladder graph and the prism graph on n vertices then we explicitly determine the minimal and maximal energies of all cubic circulant graphs on n vertices.
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- 2021
7. Energy of Graphs and Orthogonal Matrices
- Author
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Božin, V., Mateljević, M., Gautschi, Walter, editor, Mastroianni, Giuseppe, editor, and Rassias, Themistocles M., editor
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- 2011
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8. On maximal energy of line graphs with given parameters
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Mengmeng Gao, Yiting Cai, and Bo Zhou
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Numerical Analysis ,Algebra and Number Theory ,Matching (graph theory) ,010102 general mathematics ,010103 numerical & computational mathematics ,01 natural sciences ,law.invention ,Combinatorics ,Maximal energy ,law ,Line graph ,Discrete Mathematics and Combinatorics ,Geometry and Topology ,0101 mathematics ,MathematicsofComputing_DISCRETEMATHEMATICS ,Mathematics - Abstract
The maximal energies of line graphs are determined over all graphs with fixed matching number, fractional matching number and bipartiteness, respectively. The extremal graphs are characterized.
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- 2021
9. Electromuscular Incapacitation Current Induced Neuromuscular Tissue Injury
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Michelle X. Ling, Colin A. McFaul, Martha Meng, and Raphael C. Lee
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medicine.medical_specialty ,Swine ,Physiology ,Biophysics ,Action Potentials ,02 engineering and technology ,Rectus femoris muscle ,Rhabdomyolysis ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Maximal energy ,Internal medicine ,Lactate dehydrogenase ,0202 electrical engineering, electronic engineering, information engineering ,medicine ,Animals ,Radiology, Nuclear Medicine and imaging ,Muscle, Skeletal ,Acidosis ,biology ,business.industry ,Electric Conductivity ,Skeletal muscle ,020206 networking & telecommunications ,General Medicine ,medicine.disease ,Troponin ,medicine.anatomical_structure ,Gene Expression Regulation ,chemistry ,Shock (circulatory) ,Cardiology ,biology.protein ,medicine.symptom ,business - Abstract
Electrical stun devices (ESDs) serve a basic role in law enforcement and provide an alternative to lethal options for target control by causing electromuscular incapacitation (EMI). A fundamental concern is the adverse health consequences associated with their use. The capability of EMI electric field pulses to disrupt skeletal muscle cells (i.e. rhabdomyolysis) was investigated over the operational range commonly used in commercial EMI devices. Functional and structural alteration and recovery of muscle and nerve tissue were assessed. In an anesthetized swine model, the left thigh was exposed to 2 min of electrical pulses, using a commercially available ESD or a custom-made EMI signal power amplifier. Serum creatinine phosphokinase (CPK), troponin, aspartate aminotransferase (AST), and lactate dehydrogenase (LDH) levels were monitored intermittently for 6 h post-EMI exposure. A standard external cardiac defibrillator served as a positive control. Muscle and nerve tissue histology adjacent to the EMI contacts were examined. Post-EMI shock skeletal muscle function was evaluated by analyzing the compound muscle action potentials (CMAPs) of the rectus femoris muscle. Maximal energy cardiac defibrillator pulses resulted in rhabdomyolysis and marked elevation of CPK, LDH, and AST 6 h post-shock. EMI field pulses resulted in the animals developing transient acidosis. CMAP amplitudes decreased approximately 50% after EMI and recovered to near-normal levels within 6 h. Within 6 h post-EMI exposure, blood CPK was mildly increased, LDH was normal, and no arrhythmia was observed. Minimal rhabdomyolysis was produced by the EMI pulses. These results suggest that EMI exposure is unlikely to cause extremity rhabdomyolysis in normal individuals. Bioelectromagnetics. © 2020 Bioelectromagnetics Society.
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- 2020
10. Intramolecular motion-associated biomaterials for image-guided cancer surgery
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Dan Ding, Chao Chen, and Youhong Tang
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Biomaterials ,Energy distribution ,Maximal energy ,Computer science ,Imaging guidance ,Biomedical Engineering ,Photoacoustic imaging in biomedicine ,Bioengineering ,Nanotechnology ,Cancer surgery - Abstract
Intramolecular motion-associated biomaterials (iMAB) are developing rapidly in the field of image-guided cancer surgery by virtue of their easily regulated photophysical property. Through manipulating the energy distribution after absorption of light, we can easily control the maximal energy decay of iMAB through radiative pathway or non-radiative pathway for optimized fluorescence guidance or promoted photoacoustic imaging guidance. Therefore, iMAB provide an opportunity to utilize the maximum potential of imaging reagents for precise guidance of cancer surgery. In this short review, recent progress in this field has been summarized and discussed to illuminate the design and regulation principles of iMAB for advanced precise cancer surgery.
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- 2020
11. Near-infrared emission of CaAl6Ga6O19:Cr3+,Ln3+ (Ln = Yb, Nd, and Er) via energy transfer for c-Si solar cells
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Liang Zhang, Li Kong, Yingying Liu, Wensheng Wang, Lu Qiao, Hongpeng You, and Langping Dong
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Inorganic Chemistry ,Maximal energy ,Materials science ,Energy transfer ,Near-infrared spectroscopy ,Analytical chemistry ,Phosphor ,Luminescence spectra ,Luminescence ,Photoelectric conversion efficiency ,Ion - Abstract
A series of CaAl6Ga6O19:Cr3+,Ln3+ (Ln = Yb, Nd, and Er) novel near-infrared (NIR) emitting phosphors were prepared via a high-temperature solid-state reaction. The luminescence spectra and decay lifetimes of these samples were measured to prove the energy transfer process from the Cr3+ to Ln3+ ions. The CaAl6Ga6O19:Cr3+,Ln3+ (Ln = Yb, Nd, and Er) phosphors can efficiently convert the short-wavelength sunlight in the near-ultraviolet and visible (UV-Vis) regions into near-infrared emission, which matches the higher sensitivity region of the c-Si solar cells. The maximal energy transfer efficiencies of CaAl6Ga6O19:Cr3+,Ln3+ (Ln = Yb, Nd, and Er) were 25.84%, 73.90%, and 29.46%, respectively. Our results show that the CaAl6Ga6O19:Cr3+,Ln3+ (Ln = Yb, Nd, and Er) phosphors have potential applications as luminescent downshifting convertors for enhancing the photoelectric conversion efficiency of the c-Si solar cells.
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- 2020
12. On the sum of the k largest eigenvalues of graphs and maximal energy of bipartite graphs
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Seyed Ahmad Mojallal, Shaowei Sun, and Kinkar Chandra Das
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Numerical Analysis ,Algebra and Number Theory ,Open problem ,010102 general mathematics ,010103 numerical & computational mathematics ,01 natural sciences ,Upper and lower bounds ,Graph ,Combinatorics ,Maximal energy ,Partial solution ,Bipartite graph ,Discrete Mathematics and Combinatorics ,Partition (number theory) ,Geometry and Topology ,0101 mathematics ,Eigenvalues and eigenvectors ,Mathematics - Abstract
Let G be a graph of order n. Also let λ 1 ≥ λ 2 ≥ ⋯ ≥ λ n be the eigenvalues of graph G. In this paper, we present the following upper bound on the sum of the k ( ≤ n ) largest eigenvalues of G in terms of the order n and negative inertia θ (the number of negative eigenvalues): ∑ i = 1 k λ i ≤ n 2 ( θ + 1 ) ( θ + θ ( k θ + k − 1 ) ) with equality holding if and only if G ≅ n K 1 or G ≅ p K ‾ t ( n = p t , p ≥ 2 ) with k = 1 (where p K ‾ t is the complete p-partite graph of p t vertices with all partition sets having size t). Moreover, we obtain a sharp upper bound on the energy of bipartite graphs with given order n and rank r. We also propose an open problem as follows: Characterize all connected d-regular bipartite graphs of order n with 5 distinct eigenvalues and rank r = 2 n 2 ( 4 d − n ) 2 , where d > n 4 . Finally we give a partial solution to this problem.
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- 2019
13. Bicyclic signed graphs with at most one odd cycle and maximal energy
- Author
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Yaoping Hou and Dijian Wang
- Subjects
Bicyclic molecule ,Applied Mathematics ,0211 other engineering and technologies ,021107 urban & regional planning ,0102 computer and information sciences ,02 engineering and technology ,01 natural sciences ,Combinatorics ,Maximal energy ,010201 computation theory & mathematics ,Path (graph theory) ,Discrete Mathematics and Combinatorics ,Order (group theory) ,Signed graph ,Eigenvalues and eigenvectors ,Mathematics - Abstract
Let x 1 , x 2 , … , x n be the eigenvalues of a signed graph Γ of order n . The energy of Γ is defined as E ( Γ ) = ∑ j = 1 n | x j | . Let P n 4 , 4 be the signed graph obtained from two copies of negative cycles ( C 4 , σ ¯ ) joined by a path P n − 6 . In this paper, we show that P n 4 , 4 has the maximal energy among all n -vertices connected bicyclic signed graphs with at most one odd cycle.
- Published
- 2019
14. On the tree with diameter 4 and maximal energy.
- Author
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Renqian, Suonan, Ge, Yunpeng, Huo, Bofeng, Ji, Shengjin, and Diao, Qiangqiang
- Subjects
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TREES , *GRAPHIC methods , *ABSOLUTE value , *EIGENVALUES , *MATRICES (Mathematics) - Abstract
The energy of a simple graph is defined as the sum of the absolute values of all the eigenvalues of its adjacency matrix. Jianping found the structure of trees which have maximal energy among all trees of diameter 4 whose centers are of degree t . This paper generalizes the result. We determine the structure of the general tree of diameter 4 and maximal energy. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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15. Benefit Evaluation of PV Orientation for Individual Residential Consumers
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Hakim Azaioud, Jan Desmet, and Lieven Vandevelde
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Control and Optimization ,Technology and Engineering ,General Computer Science ,020209 energy ,MODELS ,Irradiance ,Energy Engineering and Power Technology ,in-plane irradiance ,02 engineering and technology ,010501 environmental sciences ,peak reduction ,lcsh:Technology ,01 natural sciences ,storage ,Global solar radiation ,Maximal energy ,Moving average ,RECORD EFFICIENCY ,Statistics ,0202 electrical engineering, electronic engineering, information engineering ,Remuneration ,Electrical and Electronic Engineering ,Engineering (miscellaneous) ,0105 earth and related environmental sciences ,Annual percentage yield ,self-sufficiency ,lcsh:T ,Renewable Energy, Sustainability and the Environment ,business.industry ,Photovoltaic system ,CONSUMPTION ,azimuth angle ,rooftop solar ,GLOBAL SOLAR-RADIATION ,Environmental science ,ARRAY ,business ,Self-sufficiency ,Energy (miscellaneous) - Abstract
Photovoltaic (PV) installations located in the northern hemisphere must be oriented to the south in order to obtain maximal annual yield. This is mainly driven by the remuneration mechanisms which incentivize maximal energy production to a certain extent. Nowadays, such support mechanisms are declining or even phased out in many countries. Hence, self-consuming the produced energy is getting more viable. In order to match better the load demand pattern, the azimuth angle of a PV installation could be changed or oriented towards multiple directions. This article investigates the benefits of PV installations facing other directions than the south. Therefore, the Hay & Davies transposition model has been used to calculate the in-plane irradiance, as it is found in the literature to be the most accurate for non-south faced PV installations. In order to determine the benefit, a large dataset of real measured consumption profiles has been used and then divided according to their annual consumption. Large consumers with an oversized east/west-oriented PV installation especially take advantage. The self-sufficiency index (SSI) is found to increase with almost 0.94 percent points, while the self-consumption index (SCI) increases with 6.46 percent points. The peak reduction is assessed by calculating the annual moving average of the month peaks. It is found that this moving average month peak reduction is marginal. Lastly, the reduction in storage capacity is found to be not that significant, although in terms of battery utilization it is found that the number of discharge cycles is reduced with 6%.
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- 2020
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16. Optimization of Fixed Photovoltaic Panel 'Tilt' Angles for Maximal Energy Harvest Considering Year-Around Sky Coverage Conditions
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Ammar Omar Gwesha, Yasir M. Alfulayyih, and Peiwen Li
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060102 archaeology ,Renewable Energy, Sustainability and the Environment ,business.industry ,media_common.quotation_subject ,Photovoltaic system ,0211 other engineering and technologies ,Energy Engineering and Power Technology ,06 humanities and the arts ,02 engineering and technology ,Solar energy ,Renewable energy ,Tilt (optics) ,Optics ,Maximal energy ,Photovoltaics ,Sky ,Environmental science ,0601 history and archaeology ,021108 energy ,business ,media_common - Abstract
The fixed setup angles of photovoltaic (PV) panels are typically optimized properly in order to maximize the electrical energy harvest. In the present work, the sunlight availability or sky coverage conditions of sufficiently small time intervals for everyday around the year are counted in the modeling for computation of solar energy on the PV panel in order to optimize the panel tilt angles. Maximal energy harvest in a year is the objective of choosing the optimal tilt angles. The analysis calculates vectors of instantaneous sunray and solar panel normal direction to consider the ‘cosine’ effect. The energy harvested in every 6 min by a PV panel of per square meter is summated for day-long period from sunrise to sunset when the sun elevation angle is above 5 deg. The general model is applied to the authors’ local city, Tucson, Arizona, USA. The results show that the annual solar energy received by a solar panel tilted with a fixed angle of equal to the local latitude could reach to 2297 kWh/m2 with the 10-year averaged sky coverage conditions of every 6 min considered. However, if a PV panel is inclined using the discovered optimal angles with two times, four-seasonal, and monthly adjustments, the gain in the yearly solar energy harvest can be 7.59%, 7.60%, and 9.19%, respectively, greater than that with the fixed angle equal to local latitude.
- Published
- 2020
17. Sunflower inflorescences absorb maximum light energy if they face east and afternoons are cloudier than mornings
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Ádám Egri, Ákos Horváth, Judit Slíz-Balogh, Gábor Horváth, Imre M. Jánosi, Balázs Virágh, and Dániel Horváth
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0301 basic medicine ,010504 meteorology & atmospheric sciences ,Science ,01 natural sciences ,Article ,03 medical and health sciences ,Maximal energy ,Anthesis ,Light energy ,Orientation ,Helianthus annuus ,Inflorescence ,Photosynthesis ,Weather ,0105 earth and related environmental sciences ,Sunlight ,Multidisciplinary ,Ecology ,Elevation angle ,Sunflower ,Environmental sciences ,Horticulture ,030104 developmental biology ,Geography ,Optics and photonics ,Medicine ,Helianthus ,Plant sciences - Abstract
The mature inflorescence of sunflowers (Helianthus annuus) orients eastward after its anthesis (the flowering period, especially the maturing of the stamens), from which point it no longer tracks the Sun. Although several hypothetical explanations have been proposed for the ecological functions of this east facing, none have been tested. Here we propose an atmospheric-optical explanation. Using (i) astronomical data of the celestial motion of the Sun, (ii) meteorological data of diurnal cloudiness for Boone County located in the region from which domesticated sunflowers originate, (iii) time-dependent elevation angle of mature sunflower heads, and (iv) absorption spectra of the inflorescence and the back of heads, we computed the light energy absorbed separately by the inflorescence and the back between anthesis and senescence. We found that the inflorescences facing east absorb the maximum radiation, being advantageous for seed production and maturation, furthermore west facing would be more advantageous than south facing. The reason for these is that afternoons are cloudier than mornings in the cultivation areas of sunflowers. Since the photosynthesizing green back of mature heads absorbs maximal energy when the inflorescence faces west, maximizing the energy absorbed by the back cannot explain the east facing of inflorescences. The same results were obtained for central Italy and Hungary, where mornings are also less cloudy than afternoons. In contrast, in south Sweden, where mornings are cloudier than afternoons, west-facing mature inflorescences would absorb the maximum light energy. We suggest that the domesticated Helianthus annuus developed an easterly final orientation of its mature inflorescence, because it evolved in a region with cloudier afternoons.
- Published
- 2020
18. Experimental determination of the bioluminescence resonance energy transfer (BRET) Förster distances of NanoBRET and red-shifted BRET pairs
- Author
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Kevin D. G. Pfleger, Jian Wang, Helen Dacres, and Felix Weihs
- Subjects
Energy transfer ,lcsh:Analytical chemistry ,HaloTag ,Bioluminescence resonance energy transfer ,7. Clean energy ,01 natural sciences ,Biochemistry ,Resonance (particle physics) ,Article ,Analytical Chemistry ,03 medical and health sciences ,Maximal energy ,Förster distance ,Environmental Chemistry ,Bioluminescence ,Spectroscopy ,030304 developmental biology ,Physics ,0303 health sciences ,lcsh:QD71-142 ,NanoLuc ,NanoBRET ,010401 analytical chemistry ,Chromophore ,Acceptor ,0104 chemical sciences ,G-protein coupled receptors ,Chemical physics ,Macromolecular Complexes ,mCherry - Abstract
Bioluminescence Resonance Energy Transfer (BRET) is widely applied to study protein-protein interactions, as well as increasingly to monitor both ligand binding and molecular rearrangements. The Förster distance (R0) describes the physical distance between the two chromophores at which 50% of the maximal energy transfer occurs and it depends on the choice of RET components. R0 can be experimentally determined using flexible peptide linkers of known lengths to separate the two chromophores. Knowledge of the R0 helps to inform on the choice of BRET system. For example, we have previously shown that BRET2 exhibits the largest R0 to date for any genetically encoded RET pair, which may be advantageous for investigating large macromolecular complexes if its issues of low and fast-decaying bioluminescence signal can be accommodated. In this study we have determined R0 for a range of bright and red-shifted BRET pairs, including NanoBRET with tetramethylrhodamine (TMR), non-chloro TOM (NCT), mCherry or Venus as acceptor, and BRET6, a red-shifted BRET2-like system. This study revealed R0 values of 6.15 nm and 6.94 nm for NanoBRET using TMR or NCT as acceptor ligands, respectively. R0 was 5.43 nm for NanoLuc-mCherry, 5.59 nm for NanoLuc-Venus and 5.47 nm for BRET6. This extends the palette of available BRET Förster distances, to give researchers a better-informed choice when considering BRET systems and points towards NanoBRET with NCT as a good alternative to BRET2 as an analysis tool for large macromolecular complexes., Graphical abstract Image 1, Highlights • Experimental determination of Förster distances (R0) for commonly applied BRET pairs. • Determination of R0 for NanoBRET with Venus, mCherry and HaloTag (TMR, NCT). • Determination of R0 for BRET6. • NanoLuc-HaloTag (NCT) exhibits the second largest R0 of any genetically encoded system.
- Published
- 2020
19. Experimental demonstration of a scalable M-ary quantum receiver (Conference Presentation)
- Author
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Abdella Battou, Sergey V. Polyakov, Ivan A. Burenkov, and M. V. Jabir
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Physics ,Frequency-shift keying ,Maximal energy ,Scalability ,Sensitivity (control systems) ,Limit (mathematics) ,Topology ,Quantum ,Scaling ,Displacement (vector) - Abstract
We report on the first experimental implementation of a scalable M-ary quantum receiver with time-resolved photon detection and real-time adaptive displacement using off-the-shelf components. We implemented M=4, 6, 8, 12, and 16 coherent frequency shift keying communication links with optimal parameters for maximal energy sensitivity. Then, we compared the measured sensitivity with the best sensitivity that can be achieved with a perfect classical measurement (shot noise limit). We observe unconditional, below the shot-noise limit sensitivity and a favorable sensitivity scaling with the alphabet length M.
- Published
- 2020
20. Numerical modeling of crack propagation with dynamic insertion of cohesive elements
- Author
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Marco Delbo, Pierre-Olivier Bouchard, D. Uribe-Suárez, D. Pino-Muñoz, Centre de Mise en Forme des Matériaux (CEMEF), MINES ParisTech - École nationale supérieure des mines de Paris, and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Work (thermodynamics) ,Materials science ,Computational fracture mechanics ,Mechanical Engineering ,0211 other engineering and technologies ,Numerical modeling ,Fracture mechanics ,02 engineering and technology ,Mechanics ,[SPI.MECA.MSMECA]Engineering Sciences [physics]/Mechanics [physics.med-ph]/Materials and structures in mechanics [physics.class-ph] ,Two stages ,[INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation ,Finite element method ,020303 mechanical engineering & transports ,Maximal energy ,0203 mechanical engineering ,Mechanics of Materials ,Path (graph theory) ,General Materials Science ,ComputingMethodologies_GENERAL ,ComputingMilieux_MISCELLANEOUS ,ComputingMethodologies_COMPUTERGRAPHICS ,021101 geological & geomatics engineering - Abstract
One of the most challenging issues in computational fracture mechanics is the propagation of a crack through a finite element mesh for arbitrary crack paths. In this work, this problem is approached by means of an advanced remeshing technique that propagates a crack using cohesive elements. The crack direction is computed using the maximal energy release rate criterion which is implemented using finite elements and the G θ method. The remeshing procedure used here is composed of two stages. In the first step, a conforming mesh is obtained in the computed crack direction, ensuring that edges are placed over the sought direction. In the second stage, cohesive elements are dynamically inserted at the conforming edges previously remeshed. The combination of this remeshing technique with dynamic insertion of cohesive elements, leads to a mesh-independent crack propagation method. The effects of different numerical and physical parameters regarding the crack path and fracture energy is investigated.
- Published
- 2020
21. The surface reactivity and structural properties of anatase TiO2 (001), (100), (101) and (105) surface researched with DFT
- Author
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Yu-Xi Lei, Nan-Xi Miao, Jian-Ping Zhou, Yuan Wang, Jing-Zhou Wang, and Ze-Qing Guo
- Subjects
Surface (mathematics) ,Anatase ,Materials science ,Maximal energy ,Surface reactivity ,Chemical physics ,Monolayer ,General Physics and Astronomy ,Layer (electronics) ,Energy (signal processing) ,Surface energy - Abstract
The surface reactivity and structural properties of anatase TiO2 (001), (100), (101) and (105) surfaces have been investigated with DFT method. The formation energy decreases with increasing the surface layers for all the surfaces. Due to the minimization of formation energy, the (101) surface is the most stable while (105) surface is the most reactive among the four calculated surfaces. The surface has a local minimal energy at the two monolayers (MLs) and then decreases slightly from the 3 MLs with increasing the layer number for (001) surface but has a local maximal energy at the 4MLs for (101) surface. The (105) surface is corrugated with a characteristic step profile along [100] direction and the surface energy oscillates with increasing the layer number.
- Published
- 2018
22. Solution to a conjecture on the maximal energy of bipartite bicyclic graphs
- Author
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Huo, Bofeng, Ji, Shengjin, Li, Xueliang, and Shi, Yongtang
- Subjects
- *
BIPARTITE graphs , *EIGENVALUES , *MATHEMATICAL formulas , *MATRICES (Mathematics) , *LINEAR algebra , *INTEGRALS , *GRAPH theory , *MATHEMATICAL proofs - Abstract
Abstract: The energy of a simple graph , denoted by , is defined as the sum of the absolute values of all eigenvalues of its adjacency matrix. Let denote the cycle of order and the graph obtained from joining two cycles by a path with its two leaves. Let denote the class of all bipartite bicyclic graphs but not the graph , which is obtained from joining two cycles and ( and ) by an edge. In [I. Gutman, D. Vidović, Quest for molecular graphs with maximal energy: a computer experiment, J. Chem. Inf. Sci. 41(2001) 1002–1005], Gutman and Vidović conjectured that the bicyclic graph with maximal energy is , for and . In [X. Li, J. Zhang, On bicyclic graphs with maximal energy, Linear Algebra Appl. 427(2007) 87–98], Li and Zhang showed that the conjecture is true for graphs in the class . However, they could not determine which of the two graphs and has the maximal value of energy. In [B. Furtula, S. Radenković, I. Gutman, Bicyclic molecular graphs with the greatest energy, J. Serb. Chem. Soc. 73(4)(2008) 431–433], numerical computations up to were reported, supporting the conjecture. So, it is still necessary to have a mathematical proof to this conjecture. This paper is to show that the energy of is larger than that of , which proves the conjecture for bipartite bicyclic graphs. For non-bipartite bicyclic graphs, the conjecture is still open. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
23. On bicyclic graphs with maximal energy
- Author
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Li, Xueliang and Zhang, Jianbin
- Subjects
- *
EIGENVALUES , *MATRICES (Mathematics) , *ABSTRACT algebra , *ALGEBRA - Abstract
Abstract: Let be the eigenvalues of a graph of order . The energy of is defined as . Let be the graph obtained from two copies of joined by a path , be the class of all bipartite bicyclic graphs that are not the graph obtained from two cycles and ( and (mod 4)) joined by an edge. In this paper, we show that is the graph with maximal energy in , which gives a partial solution to Gutman’s conjecture in Gutman and Vidović (2001) [I. Gutman, D. Vidović, Quest for molecular graphs with maximal energy: a computer experiment, J. Chem. Inf. Sci. 41 (2001) 1002–1005]. [Copyright &y& Elsevier]
- Published
- 2007
- Full Text
- View/download PDF
24. Multi-kink scattering in the double sine-Gordon model
- Author
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Aliakbar Moradi Marjaneh, Vakhid A. Gani, and Danial Saadatmand
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High Energy Physics - Theory ,Physics and Astronomy (miscellaneous) ,FOS: Physical sciences ,lcsh:Astrophysics ,Pattern Formation and Solitons (nlin.PS) ,01 natural sciences ,Maximal energy ,0103 physical sciences ,lcsh:QB460-466 ,Point (geometry) ,lcsh:Nuclear and particle physics. Atomic energy. Radioactivity ,Sine ,010306 general physics ,Nuclear Experiment ,Engineering (miscellaneous) ,Nonlinear Sciences::Pattern Formation and Solitons ,Mathematical Physics ,Physics ,Condensed Matter - Materials Science ,010308 nuclear & particles physics ,Scattering ,Materials Science (cond-mat.mtrl-sci) ,Mathematical Physics (math-ph) ,Collision ,Nonlinear Sciences - Pattern Formation and Solitons ,Model parameter ,High Energy Physics - Theory (hep-th) ,Quantum electrodynamics ,lcsh:QC770-798 - Abstract
We study collisions of two, three, and four kinks of the double sine-Gordon model. The initial conditions are taken in a special form in order to provide collision of all kinks in one point. We obtain dependences of the maximal energy densities on the model parameter. We also analyze the final states observed in these collisions., 24 pages, 12 figures; v2: figures, discussion and references added; matches the published version
- Published
- 2019
25. Direct Measurement of Nonlinear Transmission Matrices of Random Scattering Media
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Andrea Di Falco, Adam Fleming, and Claudio Conti
- Subjects
Physics ,Nonlinear system ,Optical fiber ,Optics ,Maximal energy ,Transmission (telecommunications) ,Scattering ,law ,business.industry ,Random media ,business ,law.invention - Abstract
Transmission matrices are one of the most useful tools to address the transport of light in random media. For example, they have been used for focusing [1], reconstruction of images [2], imaging through optical fibers [3], maximal energy transport [4], and control in photo-acoustics [5].
- Published
- 2019
26. SP0203 WHAT DOES REMISSION MEAN FOR PATIENTS?
- Author
-
Ruth Williams
- Subjects
medicine.medical_specialty ,Rehabilitation ,business.industry ,Doctor patient ,medicine.medical_treatment ,Pain relief ,Disease ,medicine.disease ,Rheumatology ,Maximal energy ,Rheumatoid arthritis ,Internal medicine ,Medicine ,Meaning (existential) ,business ,Intensive care medicine - Abstract
What does remission in Rheumatoid arthritis mean to patient? This session discusses what remission means to patients. Remission holds different meaning for researchers, clinicians and patients. In addition it holds different meaning for individual patients and for individual patients at different points of time in their lives. I shall reflect on over fifty years living with Rheumatoid arthritis, as both a patient and a doctor. To consider the changes in my care, my therapy and in my own and my clinicians objectives and treatment aims, at different points in time. Looking at how things have progressed from pain relief, splinting, physical therapy, rehabilitation and surgery. To progressively more effective DMARD”s, antI-TNF”s & Biologics and an aim of complete ‘clinical remission”. However commonly ‘clinical remission” can conflict with a patients concept of remission, as patients are individuals and the tools used to define remission are research based and consider populations not people. ‘Disease activity scoring” and ‘Treat to Target” has had significant impact on patients, clinicians and their rheumatology consultations. The absence of inflammation does not equal remission for many patients and it is important to consider the differing needs of patients who were diagnosed pre and post- biologic therapies and those with refractory disease. Currently maximal energy appears to be concentrated on the newly diagnosed and even pre-diagnosis, but has this been at the detriment of those with long established disease? I will share my own and different patients viewpoints of what ‘remission” means and consider the benefits of progress in effective ‘therapies’ but also to reflect upon some of the important things that may have been lost from clinical ‘care” along the way. To list simple things that can help patients achieve remission that can easily be forgotten. I will explain the phenomenon of ‘DAS blindness’ and the potential failings it can lead to. Discuss how improved shared decision making of treatment aims might improve outcomes for patients whilst reducing risk and possibly costs; aiming to increase patient autonomy and improve the doctor patient dynamic. In order to achieve ‘remission” for patients we need to have a clear shared understanding of what ‘remission” means to each individual and only then can we aim to achieve it. Disclosure of Interests: None declared
- Published
- 2019
27. Optimization on fresh outdoor air ratio of air conditioning system with stratum ventilation for both targeted indoor air quality and maximal energy saving
- Author
-
Sheng Zhang, Chao Huan, Majeed Olaide Oladokun, Yong Cheng, and Zhang Lin
- Subjects
Environmental Engineering ,business.industry ,Geography, Planning and Development ,0211 other engineering and technologies ,Environmental engineering ,02 engineering and technology ,Building and Construction ,Energy consumption ,010501 environmental sciences ,TRNSYS ,01 natural sciences ,law.invention ,Maximal energy ,Indoor air quality ,Air conditioning ,law ,Ventilation (architecture) ,Environmental science ,021108 energy ,business ,ComputingMilieux_MISCELLANEOUS ,0105 earth and related environmental sciences ,Civil and Structural Engineering ,Stratum ,Efficient energy use - Abstract
Stratum ventilation can energy efficiently provide good inhaled indoor air quality with a proper operation (e.g., fresh outdoor air ratio). However, the non-uniform CO2 distribution in a stratum-ventilated room challenges the provision of targeted indoor air quality. This study proposes an optimization on the fresh outdoor air ratio of stratum ventilation for both the targeted indoor air quality and maximal energy saving. A model of CO2 concentration in the breathing zone is developed by coupling CO2 removal efficiency in the breathing zone and mass conservation laws. With the developed model, the ventilation parameters corresponding to different fresh outdoor air ratios are quantified to achieve the targeted indoor air quality (i.e., targeted CO2 concentration in the breathing zone). Using the fresh outdoor air ratios and corresponding ventilation parameters as inputs, energy performance evaluations of the air conditioning system are conducted by building energy simulations. The fresh outdoor air ratio with the minimal energy consumption is determined as the optimal one. Experiments show that the mean absolute error of the developed model of CO2 concentration in the breathing zone is 1.9%. The effectiveness of the proposed optimization is demonstrated using TRNSYS that the energy consumption of the air conditioning system with stratum ventilation is reduced by 6.4% while achieving the targeted indoor air quality. The proposed optimization is also promising for other ventilation modes for targeted indoor air quality and improved energy efficiency.
- Published
- 2019
28. Bicyclic digraphs with maximal energy
- Author
-
Juan Rada and Juan Monsalve
- Subjects
Combinatorics ,Computational Mathematics ,Maximal energy ,Bicyclic molecule ,Applied Mathematics ,010102 general mathematics ,Digraph ,010103 numerical & computational mathematics ,0101 mathematics ,01 natural sciences ,Computer Science::Computers and Society ,Eigenvalues and eigenvectors ,Mathematics - Abstract
If D is a digraph with n vertices then the energy of D is defined as E ( D ) = ? k = 1 n | Re ( z k ) | , where Re ( z 1 ) , ? , Re(zn) are the real parts of the eigenvalues z 1 , ? , z n of D. In this paper we solve a problem proposed in Khan et?al. (2015), we find the maximal value of the energy over the set of all bicyclic digraphs B n with n vertices.
- Published
- 2016
29. Conversion of broadband UV-visible light to near infrared emission by Ca14Zn6Al10O35: Mn4+, Nd3+/Yb3+
- Author
-
Siguo Xiao, Xuejun Gao, Wenbin Xia, Xiangliang Jin, Tiejin Chen, and Xiaoliang Yang
- Subjects
Sunlight ,Chemistry ,General Chemical Engineering ,Energy transfer ,Near-infrared spectroscopy ,Analytical chemistry ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Photon upconversion ,0104 chemical sciences ,Ion ,Maximal energy ,Excited state ,0210 nano-technology ,Visible spectrum - Abstract
Efficient Ca14Zn6Al10O35: Mn4+, Nd3+/Yb3+ spectral conversion materials have been prepared by a sol–gel method. The Ca14Zn6Al10O35: Mn4+, Nd3+/Yb3+ materials can efficiently shift the short-wavelength sunlight in 250–550 nm spectral regions into near infrared emission which matches the higher sensitivity region of Si-based solar cells. The maximal energy transfer efficiency is 76.0% and 80.4% in Mn4+, Nd3+ and Mn4+, Yb3+ co-doped samples when excited at 460 nm, respectively. A dipole–dipole interaction is responsible for the energy transfer sensitization processes from Mn4+ to Nd3+/Yb3+ ions, which has been confirmed by Dexter's theory and the Yokota–Tanimoto model.
- Published
- 2016
30. Extremal energy of digraphs with two linear subdigraphs
- Author
-
Yasir Masood, Mehtab Khan, and Rashid Farooq
- Subjects
Discrete mathematics ,Class (set theory) ,Mathematics::Combinatorics ,General Mathematics ,010102 general mathematics ,Digraph ,010103 numerical & computational mathematics ,01 natural sciences ,Combinatorics ,Maximal energy ,Computer Science::Discrete Mathematics ,Adjacency matrix ,0101 mathematics ,Computer Science::Data Structures and Algorithms ,Eigenvalues and eigenvectors ,Energy (signal processing) ,Mathematics - Abstract
The eigenvalues of a digraph are the eigenvalues of its adjacency matrix. The sum of the absolute values of the real part of the eigenvalues is called the energy of the digraph. The extremal energy of bicyclic digraphs with vertex-disjoint directed cycles is known. In this paper, we consider a class of bicyclic digraphs with exactly two linear subdigraphs of equal length. We find the minimal and maximal energy among the digraphs in this class.
- Published
- 2016
31. A maximal energy pointset configuration problem
- Author
-
Braxton Osting and Brian Simanek
- Subjects
Applied Mathematics ,010102 general mathematics ,01 natural sciences ,Upper and lower bounds ,Functional Analysis (math.FA) ,Mathematics - Functional Analysis ,010101 applied mathematics ,Maximal energy ,Optimization and Control (math.OC) ,Bounded function ,FOS: Mathematics ,Applied mathematics ,Pairwise comparison ,Ball (mathematics) ,0101 mathematics ,Mathematics - Optimization and Control ,Analysis ,31C20, 31C45, 28A78, 49Q10 ,Mathematics - Abstract
We consider the extremal pointset configuration problem of maximizing a kernel-based energy subject to the geometric constraints that the points are contained in a fixed set, the pairwise distances are bounded below, and that every closed ball of fixed radius contains at least one point. We also formulate an extremal density problem, whose solution provides an upper bound for the pointset configuration problem in the limit as the number of points tends to infinity. Existence of solutions to both problems is established and the relationship between the parameters in the two problems is studied. Several examples are studied in detail, including the density problem for the $d$-dimensional ball and sphere, where the solution can be computed exactly using rearrangement inequalities. We develop a computational method for the density problem that is very similar to the Merriman-Bence-Osher (MBO) diffusion-generated method. The method is proven to be increasing for all non-stationary iterations and is applied to study more examples., Comment: 24 pages, 6 figures
- Published
- 2020
32. Improving Energy Recovery in Blended Antilock Braking Systems of Electric Vehicles
- Author
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Andrei Aksjonov, Zoja Raud, and Valery Vodovozov
- Subjects
Energy recovery ,Computer science ,010401 analytical chemistry ,antilock braking system ,020302 automobile design & engineering ,02 engineering and technology ,Aerodynamics ,01 natural sciences ,Fuzzy logic ,Automotive engineering ,0104 chemical sciences ,law.invention ,blended braking system ,Maximal energy ,0203 mechanical engineering ,law ,Drag ,road electric vehicle ,Hydraulic brake ,Torque ,Resource management ,on-board controller ,fuzzy logic - Abstract
Considering highest demands continually imposed on equipment indispensable for safe transportation, this paper focuses on on-board controllers for blended (electro-hydraulic) antilock braking systems of road electric vehicles. Recommendations are issued regarding an influence of air friction and road inclination on torque allocation between electric and hydraulic brakes and accurate accounting of the hybrid energy storage. Following the study of three types of controllers – PID, tabular, and fuzzy logic – the latter one was offered as the most efficient solution for equally fast and safe braking with maximal energy recovery on different roads, from dry to icy, without locking and skidding even in critical situations. Several parts of the system were explored in case studies ensuring their validity and accuracy.
- Published
- 2018
33. Maximal energy efficient task scheduling for homogeneous fog networks
- Author
-
Kunlun Wang, Ming-Tuo Zhou, Yang Yang, Xu Chen, Xiliang Luo, and Guowei Zhang
- Subjects
Optimization problem ,Computer science ,Distributed computing ,Computation ,05 social sciences ,050801 communication & media studies ,020206 networking & telecommunications ,02 engineering and technology ,Energy consumption ,Scheduling (computing) ,0508 media and communications ,Maximal energy ,0202 electrical engineering, electronic engineering, information engineering ,Task analysis ,Edge computing ,Efficient energy use - Abstract
In this paper, a comprehensive analytical model that considers circuit, computation, offloading energy consumptions is developed for accurately evaluating the overall energy efficiency in homogeneous fog networks. With this model, the tradeoff between performance gains and energy costs in collaborative task offloading is investigated, thus enabling us to formulate the energy efficiency optimization problem for future intelligent internet of things (IoT) applications with practical constraints in available computing resources at helper nodes and unused spectrum in neighboring environments. Based on rigorous mathematical analysis, a maximal energy efficient task scheduling (MEETS) algorithm is proposed to derive the optimal scheduling decision for a task node and multiple neighboring helper nodes under feasible modulation schemes and time allocations. Extensive simulation results demonstrate the tradeoff relationship between energy efficiency and task scheduling performance in homogeneous fog networks. Compared with traditional strategies, the proposed MEETS algorithm can achieve much better energy efficiency performance under different network parameters and service conditions.
- Published
- 2018
34. Torque Control in Blended Antilock Braking Systems of Electric Vehicles
- Author
-
Andrei Aksjonov, Zoja Raud, Eduard Petlenkov, and Valery Vodovozov
- Subjects
Computer science ,020208 electrical & electronic engineering ,Control (management) ,020302 automobile design & engineering ,Topology (electrical circuits) ,02 engineering and technology ,Automotive engineering ,law.invention ,Maximal energy ,State of charge ,0203 mechanical engineering ,law ,0202 electrical engineering, electronic engineering, information engineering ,Hydraulic brake ,Hierarchical control system ,Torque ,Resource management - Abstract
The paper focuses on the braking torque control of road electric vehicles. Recommendations are issued regarding hierarchical system topology with torque allocation between electric and hydraulic brakes and the accurate accounting of the hybrid energy storage. Equally fast and safe braking is offered with maximal energy recovery on different roads, from dry to icy, without locking and skidding even in critical situations. Several parts of the system were explored in case studies that ensured their validity.
- Published
- 2018
- Full Text
- View/download PDF
35. On the tree with diameter 4 and maximal energy
- Author
-
Yunpeng Ge, Qiangqiang Diao, Shengjin Ji, Suonan Ren-qian, and Bofeng Huo
- Subjects
Combinatorics ,Discrete mathematics ,Computational Mathematics ,Graph energy ,Maximal energy ,Degree (graph theory) ,Applied Mathematics ,Structure (category theory) ,Adjacency matrix ,Tree (graph theory) ,Eigenvalues and eigenvectors ,Energy (signal processing) ,Mathematics - Abstract
The energy of a simple graph is defined as the sum of the absolute values of all the eigenvalues of its adjacency matrix. Jianping found the structure of trees which have maximal energy among all trees of diameter 4 whose centers are of degree t. This paper generalizes the result. We determine the structure of the general tree of diameter 4 and maximal energy.
- Published
- 2015
36. The free oscillations of the earth excited by three strongest earthquakes of the past decade according to deformation observations
- Author
-
A. V. Myasnikov, M. P. Vinogradov, N. A. Perelygin, A. P. Mironov, and Vadim Milyukov
- Subjects
Shear waves ,Indian ocean ,Maximal energy ,Toroid ,Deformation (mechanics) ,Excited state ,General Earth and Planetary Sciences ,Geophysics ,Geology ,Earth (classical element) ,Seismology ,Physics::Geophysics ,General Environmental Science - Abstract
Based on the deformation data provided by the Baksan laser interferometer-strainmeter measurements, the free oscillations of the Earth (FOE) excited by the three strongest earthquakes of the past decade are analyzed. These seismic events include the Great Sumatra-Andaman earthquake that occurred in 2004 in the Indian Ocean, the Mauli earthquake of 2010 in Chile, and the Great Tohoku earthquake of March 2011 in Japan. The frequency-time structure of the free oscillations is studied, and the pattern of interaction between the modes with close frequencies (cross-coupling effect) is explored. For each earthquake, the correspondence of the observed FOE modes to the model predictions by the PREM model is investigated. A reliable consistent shift towards the high frequency of the toroidal modes with angular degree l = 12–19 is revealed. The maximal energy density of the toroidal oscillations is concentrated in the upper mantle of the Earth. Therefore, the established effect corresponds to the higher velocity of the shear waves in the upper mantle than it is predicted by the PREM model.
- Published
- 2015
37. On the extremal energy of bicyclic digraphs
- Author
-
Mehtab Khan, Azad A. Siddiqui, and Rashid Farooq
- Subjects
Combinatorics ,Discrete mathematics ,Mathematics::Combinatorics ,Graph energy ,Maximal energy ,Bicyclic molecule ,Computer Science::Discrete Mathematics ,Adjacency matrix ,Analysis ,Eigenvalues and eigenvectors ,Graph ,Mathematics - Abstract
The eigenvalues of a graph are the eigenvalues of its adjacency matrix. The energy of a graph is the sum of absolute values of its eigenvalues. Recently, the concept of energy of graphs is extended to digraphs. Minimal and maximal energy among n-vertex unicyclic digraphs is known, where n 2. In this paper, we address the problem of finding minimal and maximal energy among n-vertex bicyclic digraphs which contain vertex-disjoint directed cycles, where n 4.
- Published
- 2015
38. Atrial fibrillation ablation using remote magnetic navigation and the risk of atrial-esophageal fistula: international multicenter experience
- Author
-
Ilan Lashevsky, Decebal Gabriel Latcu, Tamas Szili-Torok, Mauricio Arruda, Asaf Danon, Ole Rossvol, Mohammed Shurrab, Krishnakumar Mohanan Nair, Eugene Crystal, Xu Chen, Eric E. Wissner, and Cardiology
- Subjects
medicine.medical_specialty ,Fistula ,medicine.medical_treatment ,Stereotaxic Techniques ,Esophageal Fistula ,Magnetics ,Postoperative Complications ,Maximal energy ,Risk Factors ,Physiology (medical) ,Atrial Fibrillation ,Prevalence ,medicine ,Humans ,Heart Atria ,Practice Patterns, Physicians' ,business.industry ,Remote magnetic navigation ,Incidence ,Atrial fibrillation ,medicine.disease ,Ablation ,Surgery ,Treatment Outcome ,Surgery, Computer-Assisted ,Catheter Ablation ,Irrigated catheter ,Clinical Competence ,Cardiology and Cardiovascular Medicine ,business ,Complication - Abstract
Remote magnetic navigation (RMN) has been used in various electrophysiological procedures, including atrial fibrillation (AF) ablation. Atrial-esophageal fistula (AEF) is one of most disastrous complications of AF ablation. We aimed to evaluate the incidence of AEF during AF ablation using RMN in comparison to manual ablation. We conducted the first international survey among RMN operators for assessment of the prevalence of AEF and procedural parameters affecting the risk. Data from parallel survey of AEF among Canadian interventional electrophysiologists (CIE) using only manual catheters served as control. Fifteen RMN operators (who performed 3637 procedures) and 25 manual CIE operators (7016 procedures) responded to the survey. RMN operators were more experienced than CIE operators (16.3 +/- 8.3 vs. 9.2 +/- 5.4 practice years in electrophysiology, p = 0.007). The maximal energy output in the posterior wall was higher in the operator using RMN (33 +/- 5 vs. 28.6 +/- 4.9 W; p = 0.02). Other parameters including use of preprocedural images, irrigated catheter, pump flow rate, esophageal temperature monitoring, intracardiac echocardiography (ICE), and general anesthesia were similar. CIE operators administered proton-pump inhibitors postoperatively significantly more than RMN operators (76 vs. 35 %, p = 0.01). AEF was reported in 5 of the 7016 patients in the control group (0.07 %) but in none of the RMN group (p = 0.11). AEF is a rare complication and its evaluation necessitates large-scale studies. Although no AEF case with RMN was reported in this large study or previously on the literature, the rarity of this complication prevents firm conclusion about the risk.
- Published
- 2015
39. Maximal Energy of Subdivisions of Graphs with a Fixed Chromatic Number
- Author
-
Meiling Hu, Wei Qiu, and Weigen Yan
- Subjects
Discrete mathematics ,Mathematics::Combinatorics ,Simple graph ,business.industry ,General Mathematics ,Combinatorics ,Maximal energy ,Multipartite graph ,Chromatic scale ,business ,Turán graph ,Energy (signal processing) ,Eigenvalues and eigenvectors ,Subdivision ,Mathematics - Abstract
The energy of a simple graph \(G\), denoted by \(E(G)\), is defined as the sum of the absolute values of eigenvalues of \(G\). In this paper, we show that, among all subdivisions of graphs with \(n\) vertices and chromatic number \(k\), the subdivision of the Turan graph \(T(n,k)\) has the maximal energy.
- Published
- 2014
40. Concept of cost-effective power-assist wheelchair's electrical subsystem
- Author
-
Andrejs Podgornovs and Kristaps Vitols
- Subjects
Wheelchair ,Maximal energy ,Computer science ,Concept development ,Propulsion ,Battery pack ,Automotive engineering ,Induction motor ,Effective power - Abstract
Article provides a concept of electrical subsystem to be used to design a power-assist wheelchair. Concept development is based on analysis of commercial products to provide a more cost-effective solution. Developed concept includes battery pack, charger, drive and propulsion motors. Battery pack is designed to be easily replaceable and chargeable, while motor and drive system is developed to provide maximal energy efficiency.
- Published
- 2017
41. Electrohydrodynamic Effect Simulation and Method of Its Optimization
- Author
-
Jolanta Wojtowicz and Hubert Wojtowicz
- Subjects
Generator (computer programming) ,Maximal energy ,Artificial neural network ,Differential equation ,Control theory ,Computer science ,Process (computing) ,Electrohydrodynamics ,Sound pressure - Abstract
The paper presents an optimization method for electrohydrodynamic effect basing on results of its simulation. The EHD effect is simulated using neural networks and differential equations describing a mathematical model of the phenomenon, which are solved using Runge - Kutta algorithm. The optimization of this effect allows finding for particular input parameters of the generator an optimal diameter of the wire, which burned in a thermo-physical process gives a maximal energy release in the form of an acoustic pressure wave.
- Published
- 2017
42. An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: hard probes
- Author
-
Malgorzata Anna Janik and Panagiota Foka
- Subjects
Heavy-ion collisions ,Particle physics ,Nuclear Theory ,Physics::Instrumentation and Detectors ,General Physics and Astronomy ,FOS: Physical sciences ,01 natural sciences ,law.invention ,High Energy Physics - Experiment ,Nuclear Theory (nucl-th) ,High Energy Physics - Experiment (hep-ex) ,Maximal energy ,High Energy Physics - Phenomenology (hep-ph) ,law ,Atlas (anatomy) ,0103 physical sciences ,medicine ,Nuclear Experiment (nucl-ex) ,High energy physics ,010306 general physics ,Collider ,Nuclear Experiment ,Physics ,Large Hadron Collider ,010308 nuclear & particles physics ,High Energy Physics::Phenomenology ,Observable ,lcsh:QC1-999 ,High Energy Physics - Phenomenology ,medicine.anatomical_structure ,Heavy ion ,Nucleon ,Energy (signal processing) ,lcsh:Physics - Abstract
The first collisions of lead nuclei, delivered by the CERN Large Hadron Collider (LHC) at the end of 2010, at a centre-of-mass energy per nucleon pair $\sqrt{s_{NN}}$ = 2.76 TeV, marked the beginning of a new era in ultra-relativistic heavy-ion physics. The study of the properties of the produced hot and dense strongly-interacting matter at these unprecedented energies is currently experimentally pursued by all four big LHC experiments, ALICE, ATLAS, CMS, and LHCb. The more than a factor 10 increase of collision energy at LHC, relative to the previously achieved maximal energy at other collider facilities, results in an increase of production rates of hard probes. This review presents selected experimental results focusing on observables probing hard processes in heavy-ion collisions delivered during the first three years of the LHC operation. It also presents the first results from Run 2 heavy-ion data at the highest energy, as well as from the studies of the reference pp and pPb systems, which are an integral part of the heavy-ion programme., Invited review paper, 18 pages
- Published
- 2017
43. Prediction Based Energy Balancing Forwarding in Cellular Networks
- Author
-
Jianjun Yang and Ju Shen
- Subjects
Engineering ,lcsh:T58.5-58.64 ,business.industry ,lcsh:Information technology ,Potential energy ,law.invention ,Flooding (computer networking) ,Maximal energy ,Signal strength ,Relay ,law ,Energy balancing ,Cellular network ,business ,Computer network - Abstract
In the recent cellular network technologies, relay stations extend cell coverage and enhance signal strength for mobile users. However, busy traffic makes the relay stations in hot area run out of energy quickly. Energy is a very important factor in the forwarding of cellular network since mobile users(cell phones) in hot cells often suffer from low throughput due to energy lack problems. In many situations, the energy lack problems take place because the energy loading is not balanced. In this paper, we present a prediction based forwarding algorithm to let a mobile node dynamically select the next relay station with highest potential energy capacity to resume communication. Key to this strategy is that a relay station only maintains three past status, and then it is able to predict the potential energy capacity. Then, the node selects the next hop with potential maximal energy. Moreover, a location based algorithm is developed to let the mobile node figure out the target region in order to avoid flooding. Simulations demonstrate that our approach significantly increase the aggregate throughput and decrease the delay in cellular network environment.
- Published
- 2017
44. The Deformation Features of Crustal Structure Beneath the East Tibetan Margin and Neighboring Areas
- Author
-
Chang Qing Sun
- Subjects
Tectonics ,geography ,geography.geographical_feature_category ,Maximal energy ,Margin (machine learning) ,Sichuan basin ,Shear wave splitting ,General Medicine ,Deformation (meteorology) ,Fault (geology) ,Geology ,Amplitude ratio ,Seismology - Abstract
Shear wave splitting analysis is one of the most commonly used techniques in structural seismology. In this study, the splitting parameters of Moho converted P-to-S phase (Pms), the time difference between maximal energy of qS1 and qS2 and their amplitude ratio were obtained. The data were from 29 broad-band stations across the Longmenshan fault belt. Subsequently, the deformation features of the crustal structure beneath the east Tibetan margin and Sichuan basin were analyzed. Our results show that the time delay and the time difference between maximal energy of qS1 and qS2 in east Tibetan margin is obviously larger than Sichuan basin. However, the amplitude ratio between qS1 and qS2 beneath Longmenshan fault is much smaller than other tectonic sub-regions. These results may suggest the existence of fluid beneath the Longmenshan fault.
- Published
- 2014
45. The effect of architectural façade design on energy savings in the student dormitory
- Author
-
Dušan Lj. Petković, Petar Pejic, and Sonja Krasic
- Subjects
Architectural engineering ,thermal comfort ,Computer science ,lcsh:Mechanical engineering and machinery ,020209 energy ,Energy (esotericism) ,0211 other engineering and technologies ,02 engineering and technology ,7. Clean energy ,Maximal energy ,energy consumption ,021105 building & construction ,11. Sustainability ,0202 electrical engineering, electronic engineering, information engineering ,lcsh:TJ1-1570 ,Renewable Energy, Sustainability and the Environment ,daylighting ,façade design ,Thermal comfort ,Energy consumption ,visual comfort ,eaves upgrading ,Work (electrical) ,EnergyPlus ,Student activities ,Facade ,Daylighting - Abstract
There are many reasons for adequate use of natural light inside students' dormitories. Intensity of light required for student activities and temperature inside the rooms are the major factors for an occupant's comfortable work and life. Design of building façades has a significant impact both on the use of natural light and energy consumption. In this paper, a comparative analysis of student rooms with different orientations and different façade designs was performed in order to investigate what type of refurbishment in the façade is necessary. The goal of the refurbishment was generation of optimal thermal and lighting comfort for students' work with maximal energy saving for a new student dormitory in Nis, Serbia. An analysis of annual energy consumption of the newly designed student dormitory and proposed replacements on the exterior façade was performed by using the software EnergyPlus. Based on the energy consumption analysis it could be concluded that significant energy savings would be possible by upgrading the shading devices across the width of the window. In other words, changing the façade of the dorm could generally improve students' comfort, while the energy costs would be reduced. [Projekat Ministarstva nauke Republike Srbije, br. TR 36037: Development of student dorms in Serbia at the beginning of the 21st century i br. TR 33051: The concept of sustainable energy supply of settlements with energy efficient buildings]
- Published
- 2014
46. Cosmic Ray Sources and Acceleration
- Author
-
Günter Sigl
- Subjects
Physics ,Maximal energy ,Astrophysics::High Energy Astrophysical Phenomena ,Astronomy ,Cosmic ray ,Astrophysics::Cosmology and Extragalactic Astrophysics ,Ultra-high-energy cosmic ray - Abstract
In the present chapter we will provide an overview over how charged cosmic ray particles can be accelerated in astrophysical objects to the high energies observed in the cosmic radiation arriving at Earth, and possibly beyond. We start with an overview of the main acceleration mechanisms and then discuss the maximal energy that can be reached by these processes. In the last section we then apply this to Galactic and extragalactic source models. The physics relevant for cosmic ray interactions and propagation within and between the sources and the observer at Earth will be the subject of Chap. 7 whereas processes relevant for secondary \(\gamma \)-rays will be discussed in Chap. 8.
- Published
- 2016
47. Capacitor allocation in radial distribution system for maximal energy savings
- Author
-
P. Vijay Babu and Satyendra Singh
- Subjects
Engineering ,Mathematical optimization ,business.industry ,020209 energy ,02 engineering and technology ,Radial distribution ,law.invention ,Capacitor ,Test case ,Maximal energy ,law ,0202 electrical engineering, electronic engineering, information engineering ,Stage (hydrology) ,Sensitivity (control systems) ,Literature survey ,business ,Energy (signal processing) - Abstract
This paper presents a two-stage procedure to determine the optimal locations and sizes of capacitor in distribution network to achieve maximum energy savings. In first stage, loss sensitivity factor (LSF) is adopted to determine the optimal capacitor locations. Later stage, a new analytical approach is proposed to find the optimal capacitor sizes. The proposed method is implemented on well-known test cases such as 15-bus, 34-bus and 69-bus radial distribution networks. Besides the cost of energy savings, installation and operation costs have been considered in present investigation. The test results demonstrate the significance of the proposed method in energy savings compare to other methods as reported in literature survey.
- Published
- 2016
48. Computing extremal energy of a class of bicyclic weighted digraphs
- Author
-
Sumaira Hafeez and Mehtab Khan
- Subjects
Class (set theory) ,Bicyclic molecule ,Computer Science::Information Retrieval ,General Mathematics ,Astrophysics::Instrumentation and Methods for Astrophysics ,Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing) ,Digraph ,010103 numerical & computational mathematics ,0102 computer and information sciences ,01 natural sciences ,Combinatorics ,Maximal energy ,Computer Science::Discrete Mathematics ,010201 computation theory & mathematics ,Computer Science::General Literature ,0101 mathematics ,Energy (signal processing) ,Eigenvalues and eigenvectors ,Mathematics - Abstract
The energy of a weighted digraph [Formula: see text] is the sum of absolute values of real part of its eigenvalues. Recently, the minimal and maximal energy of unicyclic weighted digraphs with cycle weight [Formula: see text] is studied. In this paper, we introduce a class [Formula: see text] of those bicyclic weighted digraphs of fixed order which contain vertex-disjoint weighted cycles of weights [Formula: see text] or [Formula: see text] and [Formula: see text] or [Formula: see text], where [Formula: see text]. We find digraphs in [Formula: see text] under certain conditions on [Formula: see text] and [Formula: see text] with extremal energy.
- Published
- 2019
49. A New Era for Crop Improvement: From Model-Guided Rationale Design to Practical Engineering
- Author
-
Chengcai Chu
- Subjects
Crops, Agricultural ,business.industry ,Energy conversion efficiency ,Arabidopsis ,Oryza ,Plant Science ,Agricultural engineering ,Breeding ,Models, Theoretical ,Biology ,Photosynthesis ,Biotechnology ,Maximal energy ,Plant productivity ,Energy transformation ,Genetic Engineering ,business ,Molecular Biology - Abstract
Photosynthesis is the basis of plant productivity. There is still a big gap between the efficiency of theoretical maximal photosynthetic energy conversion and the efficiency realized in the field. It was estimated that for C3 plants, the theoretical maximal energy conversion efficiency is ca. 4.6%, the observed maximal season-long energy conversion efficiency is about 2.4%, while the typical season-long energy conversion efficiency is only 0.8% (Zhu et al., 2010). Despite this, however, photosynthesis has not been effectively used as a breeding target for crop improvement so far.
- Published
- 2015
50. Gluten-Free Diet in Children: An Approach to a Nutritionally Adequate and Balanced Diet
- Author
-
F. Meneghin, Gian Vincenzo Zuccotti, Francesca Penagini, Dario Dilillo, Chiara Mameli, and Valentina Fabiano
- Subjects
Nutritional Status ,lcsh:TX341-641 ,Review ,Disease ,Nutritional quality ,Biology ,balanced diet ,Diet, Gluten-Free ,Maximal energy ,gluten-free diet ,children ,Environmental health ,Humans ,Food science ,Child ,chemistry.chemical_classification ,Nutrition and Dietetics ,nutritional and metabolic diseases ,Pediatric age ,Triticale ,Gluten ,Human nutrition ,chemistry ,Gluten free ,Nutritive Value ,nutritional complications ,lcsh:Nutrition. Foods and food supply ,celiac disease ,Food Science - Abstract
Gluten-free diet (GFD) is the cornerstone treatment for celiac disease (CD). GFD implies a strict and lifelong elimination from the diet of gluten, the storage protein found in wheat, barley, rye and hybrids of these grains, such as kamut and triticale. The absence of gluten in natural and processed foods, despite being the key aspect of GFD, may lead to nutritional consequences, such as deficits and imbalances. The nutritional adequacy of GFD is particularly important in children, this the age being of maximal energy and nutrient requirements for growth, development and activity. In recent years, attention has focused on the nutritional quality of gluten-free products (GFPs) available in the market. It is well recognized that GFPs are considered of lower quality and poorer nutritional value compared to the gluten-containing counterparts. The present review focuses on the nutritional adequacy of GFD at the pediatric age, with the aim being to increase awareness of the potential complications associated with this diet, to identify strategies in order to avoid them and to promote a healthier diet and lifestyle in children with CD.
- Published
- 2013
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