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Finite 2-Groups Whose Number of Subgroups of Each Order are at Most 2^(4)

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Communications in Mathematics and Statistics 2018年第2期6卷 207-226页

作者： lifang wang Mathematics Department Shanxi Normal UniversityLinfen 041004ShanxiChina

Assume G is a group of order 2^(n),n≥*** s_(k)(G)denote the number of subgroups of order 2^(k) of *** classify finite 2-groups G with s k(G)≤2^(4),where 1≤k≤n.

关键词： Minimal nonabelian p-groups Subgroup’s enumeration Central extension

The differential fault analysis on block cipher FeW

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Cybersecurity 2023年第2期6卷 62-74页

作者： Haiyan Xiao lifang wang Jinyong Chang School of Computer Science Northwestern Polytechnical UniversityXiAn 710055People's Republic of China Engineering University of PAP XiAn 710055People's Republic of China School of Information and Control Engineering XiAn University of Architecture and TechnologyXi'An 710055People's Republic of China State Key Laboratory of Information Security(SKLOIS) Institute of Information EngineeringChinese Academy of SciencesBeijing 100089People's Republic of China

Feather weight(FeW)cipher is a lightweight block cipher proposed by Kumar et *** 2019,which takes 64 bits plaintext as input and produces 64 bits *** Kumar et ***,FeW is a software oriented design with the aim of achieving high efficiency in software based *** seems that FeW is immune to many cryptographic attacks,like linear,impossible differential,differential and zero correlation ***,in recent work,Xie et *** the security of *** precisely,they proved that under the differential fault analysis(DFA)on the encryption states,an attacker can completely recover the master secret *** this paper,we revisit the block cipher FeW and consider the DFA on its key schedule algorithm,which is rather popular cryptanalysis for kinds of block *** particular,by respectively injected faults into the 30th and 29th round subkeys,one can recover about 55/80~69%bits of master *** the brute force searching remaining bits,one can obtain the full master secret *** simulations and experiment results show that our analysis is practical.

关键词： Differential fault analysis Block cipher FeW Side channel attack

Research on human gait sensing based on triboelectric nanogenerator

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Nanotechnology and Precision Engineering 2024年第2期7卷 32-40页

作者： Gang Yang lifang wang Jiayun Tian School of Communication and Information Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China

To address the problem of frequent battery replacement for wearable sensors applied to fall detection among the elderly,a portable and lowcost triboelectric nanogenerator(TENG)-based self-powered sensor for human gait monitoring is *** main fabrication materials of the TENG are polytetrafluoroethylene(PTFE)film,aluminum(Al)foil,and polyimide(PI)film,where PTFE and Al are the friction layer materials and the PI film is used to improve the output *** the ability of TENGs to monitor changes in environmental conditions,a self-powered sensor based on the TENG is placed in an insole to collect gait *** a TENG does not require a power source to convert physical and mechanical signals into electrical signals,the electrical signals can be used as sensing signals to be analyzed by a computer to recognize daily human activities and fall *** results show that the accuracy of the TENG-based sensor for recognizing human gait is 97.2%,demonstrating superior sensing performance and providing valuable insights for future monitoring of fall events in the elderly population.

关键词： Triboelectric nanogenerator Sensor Gait monitoring

Representation of elliptic Ding-Iohara algebra

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Frontiers of Mathematics in China 2020年第1期15卷 155-166页

作者： lifang wang Ke WU Jie YANG Zifeng YANG School of Mathematics and Statistics Henan universityKaifeng 475004China School of Mathematical Sciences Capital Normal UniversityBeijing 100048China

We define a vector representation V(u)of elliptic Ding-Iohara algebra u(q,t,p).Furthermore,we construct the tensor products of the vector representations and the Fock modulesF(u)by taking the inductive limit of certai... 详细信息

关键词： Elliptic Ding-Iohara algebra vector representation partition

A model-based driving cycle test procedure of electric vehicle batteries

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High Technology Letters 2014年第3期20卷 308-314页

作者：李勇 wang lifang Liao Chenglin wang Liye Key Laboratory of Power Electronics and Electric Drive Institute of Electrical EngineeringChinese Academy of Sciences University of Chinese Academy of Sciences

The battery test methods are the key issues to investigate the energy-storage characteristics and dynamic characteristics of electric vehicle(EV) *** this paper,the research advances of existing battery test methods as well as driving cycles are *** electric vehicle model that consists of EV dynamics model,battery model and electric motor model is *** dynamic characteristics of the battery in frequency domain are *** on the EV model and the frequency domain characteristics of the battery,a driving cycle test procedure of EV battery is *** battery test procedure is able to reflect the real-world characteristics of EV batteries,and can be used as a universal EV battery test method.

关键词： battery test methods lithium-ion battery electric vehicle (EV) model driving cycles

Atmospheric wet and dry deposition of dissolved inorganic nitrogen to the South China Sea

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Science China Earth Sciences 2020年第9期63卷 1339-1352页

作者： Ying GAO lifang wang Xianghui GUO Yi XU Li LUO State Key Laboratory of Marine Environmental Science Xiamen UniversityXiamen 361102China College of Ocean and Earth Sciences Xiamen UniversityXiamen 361102China Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies Xiamen UniversityXiamen 361102China Jiangxi Provincial Key Laboratory for Causes and Control of Atmospheric Pollution East China University of TechnologyNanchang 330013China

At the global scale,atmospheric inputs of nitrogen are an important source of the new nitrogen that supports new marine production,especially in oligotrophic open oceans and marginal *** study reports quantities of atmospheric deposition of dissolved inorganic nitrogen(DIN)to the largest marginal sea in the North Pacific(the oligotrophic South China Sea,SCS)based primarily on rainwater sampling in the open northwestern region(Yongxing Island)from 2013 to 2015,and aerosol sampling from the SCS basin in June *** wet and dry deposition of DIN and their potential contributions to productivity were *** volume-weighted mean rainwater concentrations during the wet and dry seasons were 4.9 and 18.1μmol L-1 for N+N(NO3-+NO2-),and 5.7 and 4.0μmol L-1 for NH4+,*** concentrations of DIN were lower in the marginal seas than in the open *** aerosol NO3-concentration was 1.15±1.18μg m-3 during the wet season,which is slightly lower than reported for the East China Sea and East Sea,but higher than in the Arabian *** wet and dry deposition rates ranged from 0.4-3.9 and 0.4-1.2 mmol m-2 mon-1 for NO3-,and 0.2-1.3 and 0.01-0.02 mmol m-2 mon-1 for NH4+,*** annual wet and dry deposition fluxes of DIN were estimated to be 16.8 and 10.1 mmol m-2yr-1,*** to other marginal seas,the SCS receives less atmospheric NO3-inputs than the Yellow Sea,East China Sea,East Sea,and northeastern Mediterranean *** total atmospheric DIN deposition may account for 1.8-11.1%of the nitrogen supporting new production and 0.7-1.8%of the nitrogen supporting primary production.

关键词： South China Sea Atmospheric deposition Wet deposition Dry deposition Nitrate NO3- Ammonium NH4+

Recursive modeling and online identification of lithium-ion batteries for electric vehicle applications

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Science China(Technological Sciences) 2014年第2期57卷 403-413页

作者： LI Yong wang lifang LIAO ChengLin wang LiYe XU DongPin Key Laboratory of Power Electronics and Electric Drive Chinese Academy of Sciences Institute of Electrical Engineering Chinese Academy of Sciences University of Chinese Academy of Sciences

For safe and reliable operation of lithium-ion batteries in electric vehicles,the real-time monitoring of their internal states is *** purpose of our study is to find an easily implementable,online identification method for lithium-ion batteries in electric *** this article,we propose an equivalent circuit model *** on the model structure we derive the recursive mathematical *** recursive extended least square algorithm is introduced to estimate the model parameters *** accuracy and robustness are validated through experiments and ***-road driving cycle experiment shows that the proposed online identification method can achieve acceptable accuracy with the maximum error of less than 5.52%.In addition,it is proved that the proposed method can also be used to estimate the real-time SOH and SOC of the batteries.

关键词： Lithium-ion battery battery model recursive identification recursive extended least squares (RELS) electric vehicle

Energetics and structures of hydrogen-vacancy clusters in tungsten based on genetic algorithm

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Science China(Physics,Mechanics & Astronomy) 2018年第10期61卷 100-103页

作者： lifang wang XiaoLin Shu GuangHong Lu Fei Gao Department of Physics Beihang University Department of Nuclear Engineering and Radiological Sciences University of Michigan

The behavior of hydrogen （H） in metals has been a long- standing research topic in materials science. One of the most compelling subjects is the deleterious effects of H on the microstructural evolution of materials; these effects include H embrittlement, superabundant vacancy formation, and blistering. Vacancies have been demonstrated through both experiments and computational simulations to have strong H trapping effects [1], resulting in increased H retention [2], gas-filled bubble formation [3-5], and surface modification [6-9]. In addition, at high temperatures and high H pressures, superabundant vacancy formation induced by H is observed [ 10,11 ]. Unfortunately, even though substantial research has been conducted on the interplay between H and vacancies [12-14], the detailed processes by which H-vacancy com- plexes nucleate, grow, and agglomerate remain unclear. In these processes, the energetics and structures of H-vacancy clusters are undoubtedly important.

关键词：微结构基因算法聚类氢材料科学计算模拟表面修正钨

Fairness in Admission:Voices from Rural Chinese Female Students in Selective Universities in Chinese Mainland

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Frontiers of Education in China 2016年第1期11卷 44-73页

作者： Yingyi MA lifang wang Department of Sociology Maxwell School of Citizenship and Public AffairsSyracuse UniversitySyracuseNY 13244USA Cultural Foundations of Education School of EducationSyracuse UniversitySyracuseNY 13244USA

As the Chinese mainland has transitioned from elite to mass higher education,the race to attend university has escalated to become a race to attend selective *** study focuses on rural female university students and explores how they make sense of their higher education admission *** rationalize that the inquiry into fairness is crystallized through examining rural female students’voices,which remain largely marginalized from the *** from in-depth interviews with 22 rural female undergraduates from five selective universities in northern China,we focus on their perspectives towards three key issues in higher education admission:entrance exams,region-based quotas that put them at distinct disadvantages,and new reform initiatives.

关键词： Chinese higher education reform and fairness university admission well-roundedness rural female students