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This study combines applied mathematics, visual analysis technology, information science with an approach of Scientometrics to systematically analyze the development status, research distribution and future trend of intelligent vehicles research. A total number of 3933 published paper index by SCIE and SSCI from 2000 to 2019 are researched based on Mapping Knowledge Domain (MKD) and Scientometrics approaches. Firstly, this paper analyzes the literature content in the field of intelligent vehicles by including the literature number, literature productive countries, research organization, co-authorship of main research groups and the journals from which the articles are mainly sourced. Then, co-citation analysis is used to obtain five major research directions in the field of intelligent vehicles, which include “system framework”, “internet of vehicles”, “intersection control algorithms”, “influence on traffic flow”, and “policies and barriers”, respectively. The keyword co-occurrence analysis is applied to identify four dominant clusters: “planning and control system”, “autonomous vehicle questionnaire”, “sensor and vision”, and “connected vehicles”. Finally, we divide burst keywords into three phases according to the publication date to show more clearly the change of research focus and direction over time.

To quantitatively investigate the system stability margin and provide systematic design guidance for the hybrid dual-infeed high-voltage direct current (HVdc) system, this article develops a dynamic multi-input–multi-output (MIMO) transfer function model for the hybrid dual-infeed HVdc system, consisting of a line-commutated converter-based HVdc (LCC-HVdc) link and a modular multilevel converter-based HVdc (MMC-HVdc) link located in close mutual proximity at the receiving side. Then, based on the individual channel analysis and design (ICAD) theory, the equivalent single-input–single-output (SISO) feedback control model is developed without structural information loss, which has the advantage of quantitative evaluation for the system stability margin. Then, the impacts of the ac system strength and control system on the system stability margin are quantitatively evaluated by gain margin (GM) and phase margin (PM) indexes based on the derived SISO model. Moreover, the coupling effect between the ac system strength and the control parameters is also studied. The obtained results from the theoretical analysis and the detailed electromagnetic transient (EMT) simulation in PSCAD/EMTDC validate the accuracy of the derived SISO feedback control model and the correctness of the theoretical findings.

The ring laser gyro (RLG) light intensity mode-scanning curve is the basis of the frequency stabilization, and also is the basic characterization of the oscillation characteristics for RLG ring laser and is one of the important signs of the gyro performance. By introducing a new parameter which called mode height, other characteristics of the light intensity mode-scanning curve were described. The mode height of the light intensity mode-scanning curve was the maximum variation of the corresponded light intensity under conditions of one 0.632 8 μm cavity length change, which was a characteristic quantity reflecting the sharpness of the light intensity mode-scanning curve. This characteristic quantity was directly related to the gyro frequency stabilization accuracy and the frequency stabilization response time. The higher the mode height, the higher the corresponding frequency stabilization accuracy, and the shorter the frequency stabilization response time. The physical mechanism of the mode height in RLG scanning process was analyzed theoretically, and the main factors affecting the mode height were determined. Through the theoretical analysis and the numerical simulation, it is concluded that: by increasing the curvature radius of spherical mirror, increasing the cavity length, reducing the loss and increasing the gain, the mode height of the RLG light intensity mode-scanning curve can be increased more than 3 times, which has important guiding significance and practical engineering value for improving the frequency stabilization accuracy, shortening the frequency stabilization response time, reducing the nonlinear error of gyro proportional factor, and improving the fast stability of RLG.

Objective: To analyze the role of serum sortilin in coronary artery calcification (CAC) and cardiovascular and cerebrovascular events (CCE) in maintenance hemodialysis (MHD) patients. Methods: One hundred eleven patients with MHD ≥3 months were included in this study. The general data, clinical features, hematological data, and medication history of the patients were recorded. Eighty-five cases were examined by vascular color Doppler ultrasound, cardiac color Doppler ultrasound, lateral lumbar radiography, and coronary artery calcification score. The patients were followed up for a median time of 45 months. The primary endpoint was CCE or death from a vascular event, and the role of sortilin in this process was analyzed. Results: Among 85 MHD patients, 51 cases (60.00%) had different degrees of CAC. There were significant differences in diabetes, dialysis time, serum phosphorus, calcium-phosphorus product, medical history of phosphate binders, sortilin, and carotid artery plaque between 4 different degrees of calcification groups (p < 0.05). Logistic regression analysis showed that diabetes (OR = 5.475; 95% CI: 1.794–16.71, p = 0.003), calcium-phosphorus product (OR = 2.953; 95% CI: 1.198–7.279, p = 0.019), and sortilin (OR = 1.475 per 100 pg/mL; 95% CI: 1.170–1.858, p = 0.001) were independent risk factors for CAC. During the follow-up, 28 cases of 111 patients (25.23%) suffered from CCE. There were significant differences in CCE between mild, moderate, and severe CAC groups and noncalcification groups (p < 0.05). Cox regression analysis showed that diabetes mellitus (HR 3.424; 95% CI: 1.348–8.701, p = 0.010), CAC (HR 5.210; 95% CI: 1.093–24.83, p = 0.038), and serum sortilin (HR = 8.588; 95% CI: 1.919–38.43, p = 0.005) were independent risk factors for CCE. Besides, we proposed a cutoff value of 418 pg/mL for serum sortilin level, which was able to predict the occurrence of CCE with 75.0% sensitivity and 71.9% specificity. The area under the curve was 0.778 (95% CI: 0.673–0.883). Conclusion: Sortilin is newly found to be independently associated with CAC and CCE in MHD patients.

In this study, a new ecological dispatching model for cascade hydropower stations considering fish reproduction is proposed by adding the ecological flow demand for fish spawning to the scheduling target of cascade hydropower stations. The study was conducted in the middle reaches of Jinsha River basin where Liyuan-Ahai cascade hydropower stations are located. By sorting out and analysing the habits and demands of aquatic organisms in the river along with the river water temperature and incoming water conditions, the hydrological and water temperature conditions suitable for experimental ecological regulation of the cascade section of the Jinsha River were obtained. Liyuan-Ahai cascade reservoirs were selected to carry out experimental ecological regulation simulations under different inflow scenarios. This study provides scientific basis and reference for cascade hydropower station dispatching, which can help restoration of the environment and satisfy optimal social and economic benefits. Keywords: Aquatic life demand, Cascade hydropower stations, Experimental ecological regulation

After one-month of oral treatment with traditional Chinese medicine decoction, without using other drugs, the lung inflammatory exudate, pulmonary fibrosis and quality of life of a 61-year-old female patient with corona virus disease 2019 (COVID-19) were significantly improved. No recurrence or deterioration of the patient's condition was found within seven weeks of treatment and follow-up, and no adverse events occurred, indicating that oral Chinese medicine decoction was able to improve the pulmonary inflammation and fibrosis in a patient recovering from COVID-19, but further research is still needed.

In order to rationally design the capacity of each energy coupling unit of the integrated energy system, effectively coordinate and optimize the control of the integrated energy system equipment. This paper proposes an improved cloud adaptive particle swarm algorithm design control method. First, three busbars and multi-energy coupling equipment models based on electric, thermal, and gas loads are established, and then the model has better global optimization capabilities and defenses. Then, an improved cloud adaptive particle swarm algorithm with better global optimization capabilities and anti-premature convergence characteristics is used to optimize the annual economic optimization model established to meet the power balance constraints of each bus and energy coupling equipment. Finally, under the conditions of output constraints and system energy purchase constraints, taking a typical park as an example, the simulation verifies the effectiveness of the method proposed in this paper in the optimization design and control operation of the integrated energy system.

Distribution power system connecting with multiple photovoltaic distributed generation (PV-DG) will bring a huge effect to the economical benefit and stable operation of the distribution power system. The scene of Distribution power system connecting with multiple PV-DGs is designed in this paper, considering with short-time economical benefit and stable operation, economical benefit cost index, voltage error index and voltage stable index of optimal objective, the output of PV-DG is multiple-objective optimizing; In order to improve the optimizing performance of multiple objective particle swarm optimization, the PSO based on fuzzy-C means cluster algorithm is proposed, the initialization of PSO is clarified with fuzzy-C means cluster, the Pareto solving method is used to analyze on the optimizing solution set of the optimization. Considering with uncertainty of PV-DG output and time-variation of load demand, the auto regressive moving average (ARMA) model is used to predict the PV-DG output and load demand, the forecasting data is used to optimize the short-time economical benefit and improve the stability of operation. Based on the illumination and load demand in the history, the simulation is carried on the matlab platform, the simulation results indicate that PSO based on fuzzy-C means cluster optimizing algorithm can optimize the economical benefit cost and stable operation in the same time.

Introduction： Ovarian hyperstimulation syndrome (OHSS) is an iatrogenic serious complication during assisted reproductive technology, the aim of our research is to explore the differences of pregnancy outcome between severe OHSS patients and the non-OHSS IVF patients, and also compare the pregnancy outcome of different ascites drainage way of severe OHSS patients.Design: This is a retrospective cohort analysis carried out in a University-affiliated reproductive center from 2012 to 2019 ,between 359 women with severe OHSS following ascites draining and 345 non-OHSS women (matched by age and retrieved oocyte number).We examined the rates of clinical pregnancy, multiple pregnancies, miscarriage, live birth and preterm delivery between the two groups. Within the OHSS group (central venous catheter group vs paracentesis group), odds ratios (ORs) and 95% confidence intervals (CIs) of measure of clinical pregnancy were also analyzed.Result： The biochemical pregnancy loss rate of non-OHSS patients was significantly higher than that of severe OHSS patients (11.1% vs 0.6%) , the live birth, multiple pregnancy (twin pregnancy ) was much more in severe OHSS group than in control group(88.9% vs 73.5%; 57.6% vs 28.1% respectively), and there was no significant difference between singleton and twin preterm rate and neonatal birth weight between OHSS and control group. Binary logistic regression analysis revealed multiple pregnancy and long-protocol showed relatively high odds ratio, suggest that thelong-protocol of COS and multiple pregnancy are the risk factor of severe OHSS.Among severe OHSS following ascites draining, in comparison with abdominal paracentesis and central venous catheter, the ascites volume in central venous catheter group was much more than abdominal paracentesis group, there was significant difference between the two groups. There was no significant difference between the two groups in comparison of live birth, and the birth weight of singleton and twin between these two groups. but the premature birth rate of singleton in group 1 was 9.3% (10/107), whereas in group 2, it was 3.75%.Conclusion： In conclusion, this preliminary report suggests that for the IVF-ET patients, less basic follicle number, GnRH antagonist cycle, singleton maybe the protective factors for the late-onset OHSS. Paracentesis and central venous catheter are all the effective modality to manage the ascites for the severe OHSS patients. For the patients who have the possibility of repeated paracentesis, catheter is a safe and effective way.

It is significant to research the voltage stability of the wind power centralized system (WPCS) for the effective development of the large scale clustering wind energy resources. A steady state voltage stability analysis of the WPCS by employing the PV curve and model analysis is proposed to reveal the voltage stability influence from different aspects. The PV curve is utilized to trace and indicate the voltage collapse point of the WPCS when the small disturbance of wind power is increased gradually. Then the steady state voltage instability modes of the WPCS are analyzed by calculating the bus participation factors of the minimum eigenvalue model at the collapse point. The simulation results of an actual WPCS in North China show that the static state voltage instability mode of the WPCS is closely related to the operating features and control strategies of different reactive power sources. In addition, the implementation of the doubly-fed induction generator wind turbine generator voltage control is beneficial to improve the WPCS voltage stability.

An elevated-temperature in situ microtomography apparatus that can measure internal damage parameters under tensile loads at high temperatures up to 1000 °C is developed using a laboratory x-ray source. The maximum resolution of the apparatus can reach 3 µm by a reasonable design. A high-temperature environment is accomplished by means of a heating chamber based on a radiation technique using four halogen lamps with ellipsoidal reflectors. To obtain high resolution, the chamber is much smaller in the direction of the x-ray beam than in the other two directions. Two thin aluminum windows are chosen as the chamber walls perpendicular to and intersecting the x-ray beam. A material testing machine equipped with two synchronous rotating motors is specially designed for mechanical loading and 360° rotation of the specimen, and customized grips are developed to conduct tensile tests. A microfocus x-ray source and a high-resolution detector are used to produce and detect X rays, and the distances among the x-ray source, specimen, and high-resolution detector can be adjusted to obtain different resolutions. To show the main functions and usability of the apparatus, carbon-fiber-reinforced silicon-carbide matrix specimens are subjected to in situ x-ray microtomography tensile tests at 800 °C and 1000 °C, and the crack propagation behavior under thermomechanical coupling loads is studied.

The hybrid multi-terminal Ultra-HVDC (UHVDC) transmission system combines the advantages of line commutated converter (LCC) and voltage source converter (VSC). It can meet long-distance and large-capacity power transfer requirements from multiple power supplies to multiple power receiving system. To balance the voltages between series-connected high-end converter (HEC) and low-end converter (LEC) of the power-controlled VSC station in hybrid multi-terminal UHVDC system, this paper investigates the inherent mechanism of voltage imbalance issue in the power-controlled VSC station, and then proposes a decentralized and autonomous voltage balancing control approach, which can be easily implemented in the practical engineering. Then, a hybrid three-terminal UHVDC system is developed in PSCAD/EMTDC, based on the scheme of the under-constructed Wudongde hybrid three-terminal UHVDC project (±800 kV, 8000 MW), and the effectiveness of the proposed voltage balancing control approach is investigated under steady-state, power step-change and AC fault conditions. The results show that, with the proposed control approach, the voltage-balance between series-connected converters in the power-controlled VSC station can be realized under different operating conditions.

Background Despite that the urge urinary incontinence (UUI) is a nonfatal disease, it can lead to anxiety, embarrassment and depression to the patient. UUI is a common public health problem that can significantly affect the quality of life of the patient. Several conservative treatments have been recommended for the treatment of UUI; however, their efficiency remains unclear, leaving the disease without a real effective treatment. The clinical application of acupuncture to treat UUI is currently considered an effective approach despite the limited evidence that support its efficiency. The aim of this study is to assess the efficacy and safety of electroacupuncture therapy in the treatment of UUI. Methods and analysis A randomized, parallel, controlled study will be performed. Patients with UUI treated with electroacupuncture group (EA) will compare with the sham-treated sham EA (SA) patients. A total of 100 participants with UUI will be randomly allocated to either the EA or the SA group with a 1:1 ratio. The treatment of UUI patients will performed 3 times per week, for 8 weeks in 30-minute sessions. At the end of the treatment the patients will be followed-up until week 32. The primary outcomes include scores of incontinence questionnaire-short form, the average 24-hour urgency incontinence episodes, and the average 24-hour urge episodes responses from baseline until the 4th, 8th , 24th, and 32nd week. The secondary outcomes included the average 24-hour urine volume and the average 24-hour micturition frequency responses from baseline until the 8th and 32nd week, as well as the change in incontinence quality of life scores from baseline at the 8th and 32nd week. In addition, the degree of satisfaction of the participants undergoing acupuncture treatment will be measured at the 4th and 8th week. The participants' clinical acupuncture expectations were evaluated at baseline, and the questionnaire for urinary incontinence diagnosis was used to identify stress incontinence, mixed urinary incontinence, and urge incontinence at baseline. Discussion This is a randomized, controlled, observer-blinded trial of electroacupuncture treatment for UUI. The results of this trial will provide more evidence on whether electroacupuncture is efficacious for treating UUI.

With the continuous increase of network threats, the state public institutions must carry out risk assessment methods to ensure and improve the information security of public institutions; security system must be consistent with the construction of national information security policies and requirements. The study found that China's public institutions in the information security risk assessment, there are still non-standard assessment criteria, evaluation methods, poor operability and other issues. This paper studies the model based on the level of protection and risk assessment, and puts forward the model based on the level of risk assessment and the risk assessment model. The model is based on the level of risk assessment and the risk assessment model. The evaluation model puts forward the construction process of the security system based on the information security risk assessment.

The implementation of developing the wind power is an important way to achieve the low-carbon power system. However, the voltage stability issues caused by the random fluctuations of active power output and the irrational regulations of reactive power compensation equipment have become the prominent problems of the regions where large-scale wind power integrated. In view of these problems, this paper proposed an optimal reactive power dispatch (ORPD) strategy of wind power plants cluster (WPPC) considering static voltage stability for low-carbon power system. The control model of the ORPD strategy was built according to the wind power prediction, the present operation information and the historical operation information. By utilizing the automatic voltage control capability of wind power plants and central substations, the ORPD strategy can achieve differentiated management between the discrete devices and the dynamic devices of the WPPC. Simulation results of an actual WPPC in North China show that the ORPD strategy can improve the voltage control performance of the pilot nodes and coordinate the operation between discrete devices and the dynamic devices, thus maintaining the static voltage stability as well.

Background Obesity is the biggest chronic health problems among adults worldwide and the main predisposing factor in many types of systemic diseases such as hypertension, diabetes, and so on. In clinical reports on Traditional Chinese Medicine, acupoint catgut embedding has been shown to improve various clinical indicators for diseases including obesity and body mass index (BMI), but the safety of this and method has not been assessed. Methods This systematic review searched the following 8 databases between from January 2015 to December 2018: the Cochrane Central Register of Controlled Trials, PubMed, EMBASE, the China National Knowledge Infrastructure, the Chinese Scientific Journal Database, the Wan-fang Database, the China Doctoral Dissertations Full-text Database and the China Master's Theses Full-text Database, and will manually searched the list of medical journals as a supplement. RCTs containing acupoint catgut embedding method for the treatment of obesity will be included. By reading the titles, abstracts and full texts, the 2 reviewers will independently complete the studies selection, data extraction, and quality assessment. The bias risk assessment, data synthesis, and subgroup analysis were performed using Revman 5.1 software. Results The primary outcome measures include weight, improvement rate, secondary outcome measures include BMI, waist circumference, hip circumference, waist-to-hip ratio, fat percentage, and so on. The safety assessment includes the incidence of adverse events. The results will be displayed as the risk ratio of the dichotomous data, the standardized mean difference or weighted mean difference for the continuous data. Conclusion This systematic review will retrieve clinical randomized controlled trials (RCT) on acupoint catgut embedding for obesity in 8 databases, aiming to describe and update existing evidence on the efficacy and safety of acupoint catgut embedding for obesity in adults. Prospero registration number CRD42018098793.

The changes caused by the information technology revolution to the society not only improves the science and technology level, but also develops the social information comprehensively. Besides, it leads to the profound reform in the social mode of production and the lifestyle of the ordinary people. The paper does an in-depth analysis and prospect the development trends of the information communication technology from the perspective of relationship among the information society, computer and the Internet, and systematically summarizes the basic characteristics of the information communication technology and the development trend as well as puts forward to the necessity of the close combination of the information communication technology with the user demand.

Energy-Economy-Environment (3E) is a very complex system, whose internal factors interact with each other greatly. There are great quantities of index data in the three areas which include energy, economy and environment, and there exist complex relationship among the indicators. Therefore, people hope to find a new pattern of 3E sustainable development for evaluation of the status of the 3E sustainable development. Using knowledge discovery theory the whole system builds a knowledge discovery model and finds the interaction of the index relationship. It is necessary to build an appropriate evaluation model for making predictions and precautions. This system realizes knowledge discovery model on 3E study which could provide theoretical basis and decision support for government.

It is significant to research the voltage security of the wind power centralized system (WPCS) for the effective development of the large scale clustering wind energy resources. Firstly, an actual WPCS in the Three-North regions of China is employed to analyze the voltage security problem quantitatively. By analyzing the reactive power response features of the wind turbines and the reactive power sources, the time domain simulation method is utilized to discuss the main causes and the development process of the WPCS transient voltage security accident. On this basis, a transient voltage security control strategy of the WPCS is proposed. The simulation results show that the proposed control strategy can suppress the occurrence of the wind turbines' cascading trip-off which is caused by the excessive reactive power.

Based on exist e-learning system's low educational reality and the user experience, we suggest a augmented reality smart learning system by using transparent display to solve those problem. In normal, AR learning system are hard to provide clear transparency to user and weak reality for user experience, the system's input device are webcam so make marker array recognition system is not stability enough. And system has a shortage that the learners are only can running the system in offline environment. In this paper, we designed a system to solve those problem include recognition, external brightness interference and set education service on LMS system based on cloud service to make user connection possible.

This paper analyzes the present situation of the assessment research on traditional Chinese medicine (TCM) clinical trial; estimates the features of the currently established evaluation system; commentates the characteristics and deficiencies of the evaluation index, the hierarchical structure, and the weight establishment; in the hope that multi-functional information platform, knowledge base, and TCM clinical trial evaluation system will promote each other.

Based on saliency and grayscale morphological reconstruction, a new detection algorithm for infrared dim and small targets is proposed in this paper. The saliency of the original image to obtain the region of interest (ROI) is analyzed, then the spatial domain characteristic of dim and small targets is introduced into the marker image. Grayscale morphological reconstruction is based on the marker image and the mask image (the original image). Because saliency efficiently concentrates the gradient difference of the targets, detection probability is improved also with little false alarms. As the role of recognition, spatial domain characteristic of target reduces false alarm probability with the same detection probability, and background can be well estimated by grayscale morphological reconstruction, after subtraction, dim and small targets are detected. Experiments of real data prove the better detection performance, especially higher signal-to-noise ratio (SNR).

The application of electric power replacement plays an important role in promoting the development of energy conservation and emission reduction in our country. To exploit the potentiality of regional electric power replacement, the regional GDP (gross domestic product) and energy consumption are taken as potentiality evaluation indicators. The principal component factors are extracted with PCA (principal component analysis), and the integral potentiality analysis is made to the potentiality of electric power replacement in the national various regions; a region is taken as a research object, and the potentiality of electric power replacement is defined and quantified. The analytical model for the potentiality of multi-scenario electric power replacement is developed, and prediction is made to the energy consumption with the grey prediction model. The relevant theoretical research is utilized to realize prediction analysis on the potentiality amount of multi-scenario electric power replacement.

Random fluctuation of active power output and wide variety of reactive power equipment are some of the typical characteristics of large scale wind farms cluster (WFC). In view of these characteristics, this paper proposed a coordinated strategy for reactive power and voltage control of WFC considering the influence of the wind power fluctuation. The control model of this strategy was built according to the wind power prediction, the present operation information and the historical operation information. By utilizing the automatic voltage control capability of wind farms and central substations, this strategy could achieve differentiated management between the discrete devices and the dynamic devices of WFC. The simulation results of an actual WFC in North China showed that the proposed strategy could not only improve the voltage control performance of the pilot bus, but also coordinate the operation between discrete devices and the dynamic devices and maintain the static voltage stability as well.

Orchard target-oriented variable rate spraying is an effective method to reduce pesticide drift and excessive residues. To accomplish this task, the orchard targets' characteristic information is needed to control liquid flow rate and airflow rate. One of the most important characteristics is the canopy density. In order to establish the canopy density model for a planar orchard target which is indispensable for canopy density calculation, a target density detection testing system was developed based on an ultrasonic sensor. A time-domain energy analysis method was employed to analyze the ultrasonic signal. Orthogonal regression central composite experiments were designed and conducted using man-made canopies of known density with three or four layers of leaves. Two model equations were obtained, of which the model for the canopies with four layers was found to be the most reliable. A verification test was conducted with different layers at the same density values and detecting distances. The test results showed that the relative errors of model density values and actual values of five, four, three and two layers of leaves were acceptable, while the maximum relative errors were 17.68%, 25.64%, 21.33% and 29.92%, respectively. It also suggested the model equation with four layers had a good applicability with different layers which increased with adjacent layers.

An AVC strategy coordinating the wind farm substation central compensation devices and doubly fed induction generators (DFIGs) is proposed to solve the voltage and reactive power issue caused by large scale wind farm integration. The first goal of this strategy is to bind the voltage of the point of interconnection of wind farm to the reference value given by the higher level control, and the second goal is to give priority to the reactive power output of DFIGs to ensure the dynamic compensation devices could have enough reactive power reserves and meanwhile equipoise voltage reserves among all the controlled DFIGs. The strategy is based on the real time monitoring and control platform, and the interior point filter algorithm is used to solve such a multi-objective optimization model. The simulation results of a wind farm in North China validate the proposed model and strategy.

To investigate the issue of the Internet public opinion mining. To show how to get web page information from the Internet, purify and convert the web page to appropriate format processed by computer. To find topic based on a new clustering algorithm which need not calculate all similarity and is more effective than the traditional clustering algorithm. At last discuss the hotspot detection and tracking technology.

HVDC Light is a new-type HVDC based on Voltage Sourced Converters Technology, applicable to small power transmission. HVDC Light using IGBT build up voltage source converter(VSC) and using microcomputer controlling PWM control technology, with simple operation pattern and output wave. The VSC technology have many more superiorities, such as small cubage, strong function, decreasing filter device an simplifying conversation structure. For these reasons, this technology is named HVD Light. Besides the superiorities of traditional HVDC, HVDC Light can be used for supplying to the isolated and distanced load, economically transmitting power to center load and connecting separated sources. Also, the control method of HVDC Light is much more flexible and multivariate. The voltage drop in the transmission line will be decrease and the voltage quality will be increased by using HVDC Light technology. In this paper, the control method and its application of HVDC Light will be most studied. Firstly, the mathematical model of HVDC Light and the DQ model of VS are established. Then the structure of control system and the basic control method are introduced for designing VSC controllers. The VSC controller is based on dual-close-loop control strategy. For validating the VSC controller, the MATLAB simulation models are established. It is demonstrated by simulation results that the controller is convenient flexible and efficient; moreover, the power flow and the stability of HVDC Light system can be controlled easily, all the basic control method can be achieved by this controller.

On the basis of business status of some trust and investment corporation in Beijing, this paper classifies risks of trust and investment corporations, and then establishes an indicator system, finally evaluates and monitors risks quantificationally

In order to rank and cluster the economic status of Household Consumption Expenditure in 31 provinces, cities and autonomous regions, the MATLAB software is used and the principal component analysis and the K-M cluster analysis are conducted on the data reflecting the economic status of each area. The results show that the provinces or cities with high comprehensive, scores are Shanghai Municipality, Beijing Municipality, according to priority; the provinces or autonomous regions with low comprehensive scores are Tibet, Xinjiang, Qinghai, Gansu, Hainan, Shaanxi, Yunnan, Sichuan. The economic status of Household Consumption Expenditure in the 31 provinces and autonomous regions are partly parallel with the comprehensive economic development. The improvement of the economic status of Household Consumption Expenditure is helpful for the overall economic elevation. Therefore, the government should coordinate the economic development of urban and Residents of towns and villages areas, industry and agricultural, developed region and undeveloped region, and coastal areas and central and western areas to maximize the social welfare of the whole nation.

First, the three-dimensional model of NDCT with flue gas injection and the boundary conditions was established by GAMBIT2.3 on the basis of structural parameter. On theFLUENT6.3 technology platform with self-designed program, it was found that: The new type NDCT with flue gas injection avoids a roll of low pressure zone created by smoke flue arrangement of conventional NDCT with flue gas injection. The throat corrosion of NDCT with flue gas injection was reduced, Uplifting performance of mixed gas be made up by the smoke and hot and humid air was improved. It provides some guidelines about optimizing structure of NDCT with flue gas injection and arranging flue reasonably.

This paper describes the electric power company manage the enterprise risk with the tool of risk chain management. First, it illustrates the concepts of risk chain of electric power company, risk management of the company and risk management with risk chain of the company. Then a process of risk handling with risk chain is offered and demonstrated to by an example. The result shows the risk chain management can point out more important focus to handle, advance the treatment order of risk management, and so improve the efficiency of risk management.

In this paper, we describe a modified algorithm based on the multi-scale morphological derivative (MMD) transform. By introducing the 'wing' function and by delineating the time interval over which the location of the T-wave end are searched, the T wave pattern and T wave length can be determined. According to the different lengths of T waves, different scales are calculated to perform the MMD transform. According to our experiments, we find the formula to calculate the transform scales which is significant for the MMD detector processing lots of signals with various waveforms effectively in real time system.

In this paper, a new modified method based on the multi-scale morphological derivative (MMD) transform technique is described for the detection of QRS onset in ECG signals. According to our experiments, we find the criterions of wave classification, the appropriate value of threshold and transform scales. When these are all settled down, this algorithm can set different scales to perform the MMD transform according to different lengths of QRS waves. By testing our method with ECG data from CSE database, we prove that our method can process lots of signals with various waveforms efficiently.

In order to describe propeller slipstream interactions with other components and assess the capability and applicability of different methods in propeller slipstream simulation, the flow fields and aerodynamics of propeller/nacelle and propeller/wing models at different work status are calculated. Numerical methods used for comparisons are unsteady method in which propeller is accurately simulated with body-fitted grid and quasi-steady approach where propeller is modeled as an actuator-disk. The solver used is based on unstructured embedded grid technique and OMP parallel method, Reynolds averaged Navier-Stokes equations associated with the one-equation Spalart-Allmaras turbulence model are solved and the governing equations are discretized by a second-order upwind finite-volume scheme and dual time-stepping scheme. The results for propeller/nacelle and propeller/wing configuration in axial flow conditions, which contain the induced velocity in axial and azimuthal directions and aerodynamics obtained by different methods, are compared. Meanwhile, effect of propeller installation to wing loads under differentincidence flow angles is discussed further, and some meaningful conclusions are drawn.

By combining two groups of three-phase power lines, a modeling that can induce power frequency electromagnetic fields has been presented. Charge simulation method and Biot-Savart law have respectively been adopted to compute the three-dimensional electric and magnetic fields in exposed environment of the modeling. Simulations indicate that the intensity of electric field can reach up to 5 kil-volt per meter (kV/m) at ground level, and the magnetic flux density can amount to 15 microtesla (microT). A comparison has been conducted between the environments that mice and human bodies are exposed to. The paper concluded that the modeling can be utilized in studying white mice simultaneous exposure to power frequency electric field and magnetic field emitted from transmission lines.