检索结果-南通市图书馆

Optimal Configuration Planning of Multi-energy Microgrid Based on Source-load-temperature Scenarios Deep Joint Generation

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2023年第3期9卷 1090-1102页

作者： Nantian Huang wenting wang Guowei Cai School of Electrical Engineering Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology(Northeast Electric Power University)Jilin 132012China

An optimal configuration method of a multi-energy microgrid system based on the deep joint generation of sourceload-temperature scenarios is proposed to improve the multienergy complementation and the reliability of energy supply in extreme ***,based on the historical meteorological data,the typical meteorological clusters and extreme temperature types are ***,to reflect the uncertainty of energy consumption and renewable energy output in different weather types,a deep joint generation model using a radiation-electric load-temperature scenario based on a denoising variational autoencoder is established for each weather *** the same time,to cover the potential high energy consumption scenarios with extreme temperatures,the extreme scenarios with fewer data samples are ***,the scenarios are reduced by clustering *** normal days of different typical scenarios and extreme temperature scenarios are determined,and the cooling and heating loads are determined by ***,the optimal configuration of a multi-energy microgrid system is carried *** show that the optimal configuration based on the extreme scenarios and typical scenarios can improve the power supply reliability of the *** proposed method can accurately capture the complementary potential of energy *** the economy of the system configuration is improved by 14.56%.

关键词： Deep joint generation denoising variational autoencoders multi-energy microgrid system optimal configuration planning

A dual-use probe for nano-metric photoelectric characterization using a confined light field generated by photonic crystals in the cantilever

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第11期14卷 3848-3853页

作者： Yaoping Hou Chengfu Ma wenting wang Yuhang Chen Department of Precision Machinery and Precision Instrumentation University of Science and Technology of ChinaHefei230027China Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of ChinaHefei230027China

We propose a plasmonic atomic force microscopy (AFM) probe, which takes a part of the laser beam for monitoring cantilever deflection as the excitation light source. Photonic crystal cavities are integrated near the cantilever’s free end where the laser spot locates. The transmitted light excites surface plasmon polaritons on the metal-coated tip and induces a confined hot-spot at the tip apex. Numerical simulations demonstrate that the plasmonic probe can couple a tilted, linearly polarized beam efficiently and yield a remarkable local electromagnetic enhancement with the intensity being around 21 times stronger than that of the original probe. For demonstration, we employ the plasmonic probe in electrostatic force microscopy and scanning Kelvin probe microscopy to study the impact of local light field on the photoelectric characteristics of SiO_(2) and Au nanoparticles. Compared with the original probe, obvious differences are observed in the electrostatic force gradients on SiO_(2) nanoparticles and in the surface potentials of Au nanoparticles. The plasmonic probe can enable AFM as a powerful tool for simultaneous optical, mechanical and electrical characterizations.

关键词： atomic force microscopy near-field scanning optical microscopy plasmonic probe photoelectric characterization surface plasmon polaritons

A Concise Overview on Solar Resource Assessment and Forecasting

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2022年第8期39卷 1239-1251页

作者： Dazhi YANG wenting wang Xiang'ao XIA School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150006China Key Laboratory for Middle Atmosphere and Global Environment Observation(LAGEO)

China’s recently announced directive on tackling climate change,namely,to reach carbon peak by 2030 and to achieve carbon neutrality by 2060,has led to an unprecedented nationwide response among the academia and *** such a directive,a rapid increase in the grid penetration rate of solar in the near future can be fully *** solar radiation is an atmospheric process,its utilization,as to produce electricity,has hitherto been handled by *** that,it is thought important to bridge the two fields,atmospheric sciences and solar engineering,for the common good of carbon *** thisüberreview,all major aspects pertaining to solar resource assessment and forecasting are discussed in *** the size of the topic at hand,instead of presenting technical details,which would be overly lengthy and repetitive,the overarching goal of this review is to comprehensively compile a catalog of some recent,and some not so recent,review papers,so that the interested readers can explore the details on their own.

关键词： review solar forecasting solar resource assessment

Performance Study Based on Inner Flow Field Numerical Simulation of Magnetic Drive Pumps with Different Rotate Speeds

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2012年第1期25卷 137-143页

作者： KONG Fanyu SHEN Xiaokai wang wenting ZHOU Shuiqing Research Center of Fluid Machinery Engineering and Technology Jiangsu UniversityZhenjiang 212013China Wuxi Diesel Engine Works Faw Jiefang Automotive Co.Ltd.Wuxi 214026China

Magnetic drive pump has gotten great achievement and has been widely used in some special fields. Currently, the researches on magnetic drive pump have focused on hydraulic design, bearing, axial force in China, and a new magnetic drive pump with low flow and high head have been developed overseas. However, low efficiency and large size are the common disadvantages for the magnetic drive pump. In order to study the performance of high-speed magnetic drive pump, FLUENT was used to simulate the inner flow field of magnetic drive pumps with different rotate speeds, and get velocity and pressure distributions of inner flow field. According to analysis the changes of velocity and pressure to ensure the stable operation of pump and avoid cavitation. Based on the analysis of velocity and pressure, this paper presents the pump efficiency of magnetic drive pumps with different rotated speeds by calculating the power loss in impeller and volute, hydraulic loss, volumetric loss, mechanical loss and discussing the different reasons of power loss between the magnetic drive pumps with different rotated speeds. In addition, the magnetic drive pumps were tested in a closed testing system. Pressure sensors were set in inlet and outlet of magnetic drive pumps to get the pressure and the head, while the pump efficiency could be got by calculating the power loss between the input power and the outlet power. The results of simulation and test were similar, which shows that the method of simulation is feasible. The proposed research provides the instruction to design high-speed magnetic drive pump.

关键词： magnetic drive pump simulation power loss pump efficiency

Experimental and numerical study on hysteretic performance of SMA spring-friction bearings

在线全文

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2016年第4期15卷 597-609页

作者： Zhuang Peng Xue Suduo Nie Pan wang wenting School of Civil and Transportation Engineering Beijing University of Civil Engineering and Architecture Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials Beijing University of Civil Engineering and Architecture College of Architecture and Civil Engineering Beijing University of Technology

This paper presents an experimental and numerical study to investigate the hysteretic performance of a new type of isolator consisting of shape memory alloy springs and friction bearing called an SMA spring-friction bearing （SFB）. The SFB is a sliding-type isolator with SMA devices used for the seismic protection of engineering structures. The principle of operation of the isolation bearing is introduced. In order to explore the possibility of applying SMA elements in passive seismic control devices, large diameter superelastic tension/compression NiTi SMA helical springs used in the SFB isolator were developed. Mechanical experiments of the SMA helical spring were carried out to understand its superelastic characteristics. After that, a series of quasi-static tests on a single SFB isolator prototype were conducted to measure its force-displacement relationships for different loading conditions and study the corresponding variation law of its mechanical performance. The experimental results demonstrate that the SFB exhibits full hysteretic curves, excellent energy dissipation capacity, and moderate recentering ability. Finally, a theoretical model capable of emulating the hysteretic behavior of the SMA-based isolator was then established and implemented in MATLAB software. The comparison of the numerical results with the experimental results shows the efficacy of the proposed model for simulating the response of the SFB.

关键词： sliding isolation bearing SMA helical spring hysteretic performance quasi-static test theoretical model

Morphological characteristics of the lumbosacral spinal cord urogenital center in Sprague Dawley rats

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2009年第12期4卷 1099-1103页

作者： Mouwang Zhou wenting wang Qingshan Chen Department of Rehabilitation Medicine Peking University Third Hospital Beijing 100191 China Department of Anatomy and Histology & Embryology Peking University Health Science Center Beijing 100191 China

BACKGROUND： Studies have demonstrated that selective innervation of the sacral nerve tract to the bladder plays an important role in bladder functional reconstruction following spinal cord injury. However, there are very few studies reporting detailed morphological characteristics of urogenital center and lumbosacral nerve roots. OBJECTIVE： To analyze the spinal cord segment of the lumbosacral spinal cord urogenital center, and to observe morphological characteristics. DESIGN, TIME AND SETTING： A neuroanatomical study was performed at the Laboratory of Neuroanatomy, Peking University Health Science Center between September 2007 and March 2008. MATERIALS： Horseradish peroxidase-conjugated cholera toxin B subunit （CB-HRP） was purchased from Sigma, USA; surgical microscope was purchased from Zhenjian Zhongtian Optical Instrument, Jiangsu Province, China; BCL-420 biological and functional experimental system was purchased from Taimeng Science and Technology, Sichuan Province, China. METHODS： A total of 36 adult, Sprague Dawley rats were randomly assigned to groups A （n = 10）, B （n = 10）, C （n = 10）, and D （n = 6）. CB-HRP （3%, 10-15 μL） was injected into the bladder detrusor muscle （group A）, external urethral sphincter （group B）, and perineal muscles （group C）, respectively. Rats in group D were not given any treatments. MAIN OUTCOME MEASURES： At 72 hours after CB-HRP injection, CB-HRP-positive neurons were analyzed in lumbosacral segments using 3, 3＇, 5, 5＇-tetramethylbenzidine staining and an Olympus optic microscope, while anatomical structures in the respective spinal nerve tract were observed using a surgical microscope. RESULTS： CB-HRP-positive neurons were distributed in the L6-S1 segments of the spinal cord, and neurons primarily innervating the bladder detrusor muscle were located at the sacral parasympathetic nucleus and the intermediolateral nucleus. In addition, neurons that primarily innervate the external urethral sphincter and perineal muscles were observ

关键词： urogenital center morphology microsurgical anatomy Sprague Dawley rats

The mass of our Milky Way

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2020年第10期63卷 1-46页

作者： wenting wang JiaXin Han Marius Cautun ZhaoZhou Li Miho N.Ishigaki Department of Astronomy Shanghai Jiao Tong UniversityShanghai 200240China Kavli IPMU(WPI) UTIASThe University of TokyoKashiwaChiba 277-8583Japan Leiden Observatory Leiden UniversityPO Box 9513NL-2300 RA Leidenthe Netherlands Astronomical Institute Tohoku UniversityAoba-kuSendaiMiyagi 980-8578Japan

We perform an extensive review of the numerous studies and methods used to determine the total mass of the Milky *** group the various studies into seven broad classes according to their modeling *** classes include:i)estimating Galactic escape velocity using high velocity objects;ii)measuring the rotation curve through terminal and circular velocities;iii)modeling halo stars,globular clusters and satellite galaxies with the spherical Jeans equation and iv)with phase-space distribution functions;v)simulating and modeling the dynamics of stellar streams and their progenitors;vi)modeling the motion of the Milky Way,M31 and other distant satellites under the framework of Local Group timing argument;and vii)measurements made by linking the brightest Galactic satellites to their counterparts in *** each class of methods,we introduce their theoretical and observational background,the method itself,the sample of available tracer objects,model assumptions,uncertainties,limits and the corresponding measurements that have been achieved in the *** the measured total masses within the radial range probed by tracer objects and the extrapolated virial masses are discussed and *** also discuss the role of modern numerical simulations in terms of helping to validate model assumptions,understanding systematic uncertainties and calibrating the *** measurements in the last two decades show a factor of two scatters,recent measurements using Gaia DR2 data are approaching a higher *** end with a detailed discussion of future developments in the field,especially as the size and quality of the observational data will increase tremendously with current and future *** such cases,the systematic uncertainties will be dominant and thus will necessitate a much more rigorous testing and characterization of the various mass determination methods.

关键词： Milky Way dark matter stellar halo dynamics satellite galaxies

Long-term trends of precipitation and erosivity over Northeast China during 1961-2020

在线全文

学校读者我要写书评

暂无评论

International Soil and Water Conservation Research 2023年第4期11卷 743-754页

作者： wenting wang Shuiqing Yin Juan Yu Zeng He Yun Xie College of Education for the Future Beijing Normal University at ZhuhaiZhuhai519087China State Key Laboratory of Earth Surface Processes and Resource Ecology Faculty of Geographical ScienceBeijing Normal UniversityBeijing100875China College of Arts and Sciences Beijing Normal University at ZhuhaiZhuhai519087China Zhixing College Beijing Normal University at ZhuhaiZhuhai519087China

Northeast China(NEC)is one of the vital commercial grain bases in China and it has suffered from soil erosion due to prolonged cultivation and lack of *** determine long-term trends of precipi-tation and rainfall erosivity over NEC during the latest decades,daily precipitation for the entire year during 1961-2020 and hourly precipitation for the warm season(May to September)during 1971-2020 were collected for 192 and 126 stations,*** seasons,including the cold season(October to April),early warm season(May to June),and late warm season(July to September)were divided according to the combination of precipitation and *** demonstrate:(1)Daily precipita-tion reveals total precipitation and rainfall erosivity in the cold season and early warm season increase significantly at relative rates of 3.1%-6.1%compared with the average during 1961-2020,and those in the late warm season decrease insignificantly.(2)Hourly precipitation reveals storms occurring in the early and late warm seasons have undergone significant increasing changes,which shift towards longer storm duration,larger amount,peak intensity,kinetic energy,and rainfall erosivity during ***,the frequency of extreme storms increased.(3)Rainfall erosivities estimated from daily pre-cipitation during 1971-2020 increase insignificantly for the early and late warm season,whereas those from hourly precipitation increase significantly(6.1%and 5.5%,respectively),which indicates daily precipitation may not be able to capture the trend fully under the warming background,and precipi-tation at higher resolutions than the daily scale is necessary to detect trends of rainfall erosivity more accurately.

关键词： Rainfall erosivity Climate change Storm characteristic Hourly precipitation Northeast China

Optimal Designs of Wound Field Switched Flux Machines with Different DC Windings Configurations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CES Transactions on Electrical Machines and Systems 2022年第4期6卷 359-367页

作者： wenting wang Yuankui wang Enlin Ma Lijian Wu IEEE Zhejiang University Hangzhou3100005 China China State Shipbuilding Corporation Ltd.

Wound field switched flux(WFSF)machines exhibits characteristics of the simple robust rotor,flexible flux-adjustable capability,and no risk of ***,they suffer from a poor torque density compared with permanent magnet machines due to the ***,in this paper,two WFSF machines with single-and double-layer DC windings,respectively,are optimized for the maximum *** end-winding(EW)lengths differ in these two machines,which can affect the optimal *** parameters including the DC to armature winding copper loss ratio,slot area ratio and split ratio are optimized when two machines have the same copper loss and overall *** addition,the influence of the flux density ratio,total copper loss,air-gap length and aspect ratio on the optimal split ratio is investigated using the finite element method and results are explained through the analytical model accounting for the *** is discovered that the EWs have no effect on the optimal copper loss ratio,which is *** terms of the slot area ratio,the machine with single-layer DC windings prefers smaller DC slot areas than armature slot *** the WFSF machine with longer EWs,the optimal split ratio becomes ***,compared with other parameters,the flux density ratio can significantly affect the optimal split ratio.

关键词： Design End-winding Optimization Split ratio Wound field switched flux machine