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基于模糊DSVM控制策略的异步电机直接转矩控制

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中南大学学报（自然科学版） 2008年第1期39卷 166-171页

作者：奚国华张艳存胡卫华喻寿益桂卫华中南大学信息科学与工程学院

针对传统的异步电机直接转矩控制系统低速转矩脉动大、磁链轨迹内陷、电流畸变严重以及开关频率不固定等缺点,基于离散空间电压矢量调制(DSVM)技术和模糊控制技术提出一种改善异步电动机直接转矩控制系统低速运行性能的控制策略。将一... 详细信息

针对传统的异步电机直接转矩控制系统低速转矩脉动大、磁链轨迹内陷、电流畸变严重以及开关频率不固定等缺点,基于离散空间电压矢量调制(DSVM)技术和模糊控制技术提出一种改善异步电动机直接转矩控制系统低速运行性能的控制策略。将一个控制周期细分为m个时间片,每个时间片输出1个电压矢量,可以合成多个等效的空间电压矢量,供控制策略选择,优化了开关选择表。采用模糊控制器选择电压工作矢量,取代传统的滞环比较控制器。仿真结果表明,改进的DSVM控制策略及模糊控制算法的应用,有效改善了直接转矩控制的低速运行性能。在开关频率恒定的前提下,低速时磁链轨迹趋于圆形,电流谐波分量明显减少,平均转矩脉动降低为3.1%。

关键词：直接转矩控制模糊控制离散空间矢量调制低速性能

Selection of Oxygen Pressure in BOF Steelmaking

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Journal of Iron and Steel Research International 2011年第11期18卷 12-16页

作者： WANG Ming-lin LU Ying-hua YANG Wen-yuan LI Shu-gui XU Xiao-wei Central Iron and Steel Research Institute Beijing 100081 China Sinosteel Anshan Research Institute of Thermo-Energy Co Ltd Anshan 114044 Liaoning China Ma＇anshan Iron and Steel Co Ma＇anshan 243100 Anhui China

Based on the on-site investigation and the principle of compressible flow, the working oxygen pressure should be matched to the Mach-number at the nozzle in designing nozzle and oxygen supply schedule so that the higher penetration depth and the more blending energy can be obtained for reducing energy loss by shock wave in the ultrasonic oxygen jet in the normal BOF steelmaking. For some special BOF blowing technologies, such as steelmaking with high phosphorus hot metal, post combustion oxygen lance, hot metal pretreatment, etc, the difference between working oxygen pressure and designed diffusion pressure which is related to Mach-number is necessary, so that the velocity of the oxygen jet will be decreased because of shock wave for expected metallurgical results.

关键词： oxygen pressure Mach-number steelmaking penetration depth

Isolated atomic catalysts encapsulated in MOF for ultrafast water pollutant treatment

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Nano Research 2021年第7期14卷 1287-1293页

作者： Shuailong guo Hao Yuan wei Luo Xiaoqing Liu Xiantao Zhang Haoqing Jiang Feng Liu Gary J.Cheng The Institute of Technological Sciences Wuhan UniversityWuhan430072China Birck Nanotechnology Centre School of Industrial EngineeringPurdue UniversityWest LafayetteIN47906USA School of Power and Mechanical Engineering Wuhan UniversityWuhan430072China Center for materials research and analysis Wuhan University of TechnologyWuhan430072China

Atomic noble metals stand as one of the most advanced catalysts because of their unique properties and interaction with the ***,due to their high activity,noble atomic catalysts tend to aggregate and deactivate in practical ***,supports aimed to disperse these atomic catalysts often suffer from weak confinement and poor porosity,thus limited the catalytic efficiency of noble ***,we report the facile encapsulation of atomic noble catalyst in cheap cerous metal-organic framework(Ce-MOF)crystals to create a robust catalyst that could deliver high catalytic performance for the reduction of 4-nitrophenol without decay in long-term cycling ***,Au atoms encapsulated in Ce-MOF exhibited ultrahigh turnover frequency(TOF)of 131 min−1 for the reduction of 4-nitrophenol in minutes,consuming only 10%precious metals compared with state-of-the-art catalysts operated under same condition.

关键词： atomic catalysts metal-organic framework reduction of 4-nitrophenol porous

Efficient micrometer-scale thick-film perovskite solar cells with superior stability

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Rare Metals 2024年第4期43卷 1647-1657页

作者： Jian-Fei Hu Gang Chen Shun-Zhang Yu Yue-Xin Lin Kai-Yu Wang Zong-wei Li guo-Dong Zhang Teng-Fei Pan Ya-Jing Li Ming-Jie Li Ying-Dong Xia Yi-Fan Lv Yong-hua Chen Key Laboratory of Flexible Electronics(KLoFE)and Institute of Advanced Materials(IAM) School of Flexible Electronics(Future Technologies)Nanjing Tech University(NanjingTech)Nanjing211816China Department of Applied Physics The Hong Kong Polytechnic UniversityHong Kong999077China Shenzhen Research Institute The Hong Kong Polytechnic UniversityShenzhen518057China Optics Valley Laboratory Hubei430074China

It is essential to enhance the thickness of the absorber layer for perovskite solar cells(PSCs)to improve device performance and reduce industry ***,thick perovskite films(>1μm)are difficult to be fabricated by employing traditional solvents,such as N,N-dimethylformamide(DMF),dimethyl sulfoxide(DMSO).Besides,it is a challenge to fabricate thick-film perovskite owing to the deteriorated surface morphology and serious defect ***,a simple method was reported to deposit uniform pinhole-free perovskite films with a thickness of more than 2μm utilizing the methylamine acetate(MAAc)ionic liquid as the *** with methylammonium chloride(MACl)as an additive,thick-film perovskite with~2μm in grain size and few grain boundaries(GBs)was prepared,which dramatically improved the perovskite crystal quality and enhanced carrier transport *** final PSCs exhibited a power conversion efficiency(PCE)of 20.16%.The device showed improved stability with 95%of its initial efficiency in a nitrogen environment over 5000 *** work provides an alternative strategy to produce extremely efficient and stable thick-film *** can be believed that this device has great potential in the application of large areas and laminated PSCs.

关键词： Perovskite solar cells Thick-film Stability Ionic liquid

Computational systems pharmacology reveals anantiplatelet and neuroprotective mechanism of Deng-Zhan-Xi-Xin injection in treatment of ischemic stroke

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中国药理学与毒理学杂志 2019年第10期 857-858页

作者： ZHAO Jing LYU Chao WU Qiu-ling ZENG hua-wu guo Xin YANG Jian TIAN Sai-sai ZHANG wei-dong Institute of Interdisciplinary Integrative Medicine Research Shanghai University of Traditional Chinese Medicine School of Pharmacy Fujian University of Traditional Chinese Medicine School of Pharmacy Second Military Medical University

Herbs are typically prescribed in traditional Chinese medicine(TCM) to treat complex diseases. The multicomponent nature of herbal drug ingredients makes it difficult to readily understand their mode of action. To decipher their molecular mechanisms, here we proposed a novel computational systems pharmacology based approach, which consisted of transcriptome profiling,data collection, statistical analysis, network algorithm,bioinformatics analysis and pharmacological *** network algorithm called signed random walk with restart(SRWR) was used to simulate the propagation of drugs effects on networks. This algorithm could identify proteins either positively or negatively regulated(activated or inhibited) by drugs on human signaling networks. To establish proof of principle, the herbal product Deng-Zhan-XiXin injection(DZXXI), which exhibits pharmacological effects in ischemic stroke but its mechanism was unclear,was analyzed. Eighty-three targets were predicted with high confidence for DZXXI′s active compounds in plasma,and 87 differentially expressed genes(DEGs) were identified in MCF7 cells treated with DZXXI. These target genes were further found to be associatedwith pathways involved in neuronal apoptosis in ischemic stroke, such as NF-κB signaling, TNF signaling, and PI3K-Akt *** analysis between DZXXI’s putative targets with ischemic stroke-associated genes identified two important targets(PTGS1, PTGS2) corresponding to four DZXXI compounds, which were further validated using in silico and in vitro/in vivo models. The most inhibited genes identified by the SRWR algorithm were significantly enriched with ischemic stroke-associated disease genes,antiplatelet associated pathways, and their encoded proteins were enriched in brain, vascular endothelium and platelets. The CMAP analysis based on DEGs suggested that DZXXI could function as both an anti-inflammatory and anti-platelet agent. Taken together, the computational analysis suggested

关键词： ischemic stroke Deng-Zhan-Xi-Xin injection computational analysis

Role of Epithelium Sodium Channel in Bone Formation

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Chinese Medical Journal 2016年第5期129卷 594-600页

作者： Ruo-Yu Wang Shu-hua Yang wei-hua Xu Department of Orthopedics Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan Hubei 430022 China

Objective：To review the recent developments in the mechanisms of epithelium sodium channels （ENaCs） induced bone formation and *** Sources：Studies written in English or Chinese were searched using Medline,PubMed and the index of Chinese-language literature with time restriction from 2005 to *** included ENaC,bone,bone formation,osteonecrosis,estrogen,and *** from published articles about the structure of ENaC,mechanism of ENaC in bone formation in recent domestic and foreign literature were *** Selection：Abstract and full text of all studies were required to *** those were not accessible and those did not focus on the keywords were ***：ENaCs are tripolymer ion channels which are assembled from homologous α,β,and γ *** structure of ENaCs suggests that ENaC has a central ion-channel located in the central symmetry axis of the three *** are protease sensitive channels whose iron-channel activity is regulated by the proteolytic *** opening probability of ENaCs is regulated by proteinases,mechanical force,and shear *** molecules are involved in regulation of ENaCs in bone formation,including nitride oxide synthases,voltage-sensitive calcium channels,and ***：The pathway of ENaC involved in shear stress has an effect on stimulating osteoblasts even bone formation by estrogen interference.

关键词： Bone Formation Epithelium Sodium Channel Estrogen Osteoblasts Shear Stress

Reconfigurable Threshold Logic Element with SET and MOS Transistors

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Chinese Physics Letters 2012年第2期29卷 225-228页

作者： wei Rong-Shan CHEN Jin-Feng CHEN Shou-Chang HE Ming-hua College of Physics and Information Engineering Fuzhou UniversityFuzhou 350108

A novel reconfigurable threshold logic element (TLE) using single-electron transistors (SETs) and metal-oxide semiconductor (MOS) transistors is *** proposed TLE is highly reconfigurable,which can perform all two-variable logic functions directly or indirectly,including OR,NOR,AND,NAND,XOR and *** reconfiguration of the TLE is realized by simply configuring the input bits without changing the device *** design methodology can also be applied in the design of a multi-variable *** reconfigurable TLE demonstrates good performance at room temperature with a compact structure and ultralow power *** reconfigurable TLE can be useful in high-density high-performance reconfigurable systems and artificial neural networks.

关键词： parameters figuration simply

Development of unconventional gas and technologies adopted in China

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Energy Geoscience 2020年第1期1卷 55-68页

作者： Yang Li De-hua Zhou wei-Hong Wang Ting-Xue Jiang Zhao-Jie Xue China Petroleum&Chemical Corporation Beijing100728China Sinopec Exploration&Production Research Institute Beijing100083China Sinopec Research Institute of Petroleum Engineering Beijing100101China

This study analyses the geological characteristics and development progress of unconventional gas in China,summarizes the development theories and technologies,discusses the prospects and challenges of unconventional gas development,and puts forward the future trends of development *** technologies of unconventional gas development are available in *** gas development technologies include comprehensive geological evaluation,volume fracturing of cluster horizontal wells under complex stress conditions,and factory-like operation of horizontal wells in complex mountainous area et *** gas development technologies include fluid identification and quantitative prediction,optimization of well patterns,multi-layer fracturing in vertical well,staged fracturing in horizontal well,and drainage gas *** methane(CBM)development technologies include the prediction of medium-high-and medium-low-rank CBM enrichment areas,rate-variable hydraulic fracturing,and quantitative drainage recovery with five stages,three pressures,and four *** economic and effective development of unconventional gas,further efforts should be ***,intensified studies should be conducted on high-precision prediction and fine characterization technologies of high-quality shale reservoirs in deep marine,continental,and transitional ***,key theories and technologies such as fast drilling and completion of wells with long laterals as well as large-scale volume fracturing should be developed to improve well ***,new technologies such as multiple well-type development,fluid injection,and nano-flooding should be developed to enhance the ***,effort should be made to identify the accumulation mechanism and large-scale effective development technologies for ***,the application of large amounts of data and artificial intelligence in the entire process of unconventional gas development should be considered to reduce the dev

关键词： Unconventional gas Geologic characteristics Development history Integrated development technology

Simulation of the regional climatic effect of irrigation over the Yellow River Basin

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Atmospheric and Oceanic Science Letters 2017年第4期10卷 291-297页

作者： CHEN Liang MA Zhu-guo ZHAO Tian-Bao LI Zhen-hua LI Yan-Ping CAS Key Laboratory of Regional Climate-Environment for Temperate East Asia Institute of Atmospheric Physics Chinese Academy of Sciences Global Institute for Water Security University of Saskatchewan

In this study, the authors developed a new irrigation scheme based on the Noah land surface model, and then coupled it with the Weather Research and Forecasting regional climate model. Two simulations （with and without irrigation） were conducted over the Yellow River basin for the period April to October 2000-2010. The results indicated that the WRF model is able to successfully capture the spatial pattern and seasonal changes in observed temperature and precipitation over the Yellow River basin. When irrigation was induced, the mean surface air temperature at 2 m （T2m） decreased by 0.1-0.4 K, and there was a correspond increase （decrease） in latent （sensible） heat flux over the irrigated areas, wherein the increase （decrease） reached more than 10 W m-2 over the largest irrigated areas. The cooling effect was consistent with the changes in evapotranspiration and heat fluxes due to *** changes in lifting condensation level and planetary boundary layer height led to a greater probability of cloud formation and bore a close association with surface fluxes and soil moisture, which then impacted the spatial distribution of T2rn and precipitation.

关键词： Irrigation WRF regionalclimate