检索结果-南通市图书馆

Constant-round auction with insulated bidders

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Science China(Information Sciences) 2022年第4期65卷 264-266页

作者： Jie MA bin QI Kewei lv State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of Sciences Data Assurance and Communication Security Research Center Chinese Academy of Sciences School of Cyber Security University of Chinese Academy of Sciences

Dear editor,In recent years, online auction has gained widespread popularity as a primary characteristic of electronic commerce among masses. It has also become a primary topic of research interest. Cryptographic primitives such as secure multiparty computation(MPC) [1], zero-knowledge proof(ZKP) [2] and commitment scheme [3] are being effectively utilized for the proposal of various schemes. Therefore,

关键词： Auction Commitment Integer Comparison Protocol Constant-round Blockchain

Recent progress of in-situ characterization of LiNi_(1−x−y)Co_(x)Mn_(y)O_(2) cathodes for lithium metal batteries: A mini review

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Nano Research 2024年第3期17卷 1384-1401页

作者： Huanzhu lv Xiaoqi Zhu Jun Mei Yuanhua Xia bin Wang Institute of Fundamental and Frontier Science University of Electronic Science and Technology of ChinaChengdu 611731China Chengdu Development Center of Science and Technology China Academy of Engineering PhysicsChengdu 610200China Key Laboratory of Neutron Physics and Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics(CAEP)Mianyang 621999China

In the context of the gradual popularity of electric vehicles(EVs),the development of lithium battery systems with high energy density and power density is regarded as the foremost way to improve the range of EVs.LiNi_(1-x-y)Co_(x)Mn_(y)O_(2)(NCM)cathodes have been the focus of researchers due to their high energy density,excellent power performance,and low-temperature resistance.However,the elaboration of the decay mechanism of NCM cathode based on lithium metal batteries(LMBs)is still being restricted to the primary level.In the past decades,the development and application of advanced in-situ characterization tools have facilitated researchers'understanding of the internal operation mechanism of batteries during charging and discharging.In this minireview,the latest progress of in-situ observation of the NCM cathode by X-ray diffraction(XRD),fourier transform infrared(FT-IR)spectroscopy,Raman spectroscopy,atomic force microscopy(AFM),transmission electron microscope(TEM),optical microscope,and other characterization tools is summarized.The mechanisms of structural degradation,cathode-electrolyte interfaces(CEIs)composition,and dynamic changes of NCM,electrolyte breakdown,and gas production are elaborated.Finally,based on the existing research progress,the opportunities and challenges for future in-situ characterization technology in the study of the mechanism of LMBs are discussed in depth.Therefore,the purpose of this minireview is to summarize recent work that focuses on the outstanding application of in-situ characterization techniques in the mechanistic study of LMBs,and pointing the way to the future development of high energy density and power density LMBs systems.

关键词： lithium metal batteries(LMBs) In-situ characterization LiNi_(1-x-y)Co_(x)Mn_(y)O_(2)(NCM)

Composite separator based on PI film for advanced lithium metal batteries

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Journal of Materials Science & Technology 2022年第7期102卷 264-271页

作者： bin Sun Zili Zhang Jing Xu Yanpeng lv Yang Jin Research Center of Grid Energy Storage and Battery Application School of Electrical EngineeringZhengzhou UniversityZhengzhou 450001China

Lithium(Li) metal batteries have received extensive research focusing on the dendrite growth issue on account of the high chemical activity of Li anode. While, thermal safety, as one of the important security concerns facing the further application, gets little attention. Here, the high-performance polyimide film is successfully developed to enhance the safety margin based on the excellent mechanical strength and heat resistance corresponding to the traditional separator. And, the polyimide film with the Mo S2 coating made by spraying method as the composite separator can not only improve the wettability to the electrolyte, but also in-situ form an artificial layer with the low nucleation barrier for the Li ions. When used in both the coin cell and the pouch cell, all achieve the outstanding cycling stability and the coulombic efficiency. Specially, the in-situ Li ions nucleation behaviors are investigated by optical microscopy in the capillary cell. The electric field intensity at the Li anode surface is also simulated by COMSOL Multiphysics to further elucidate the effect of the coating.

关键词： Polyimide film Composite separator Lithium anode Molybdenum sulfide Thermal safety

Improved Algorithm for Solving Discrete Logarithm Problem by Expanding Factor

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China Communications 2020年第4期17卷 31-41页

作者： bin Qi Jie Ma Kewei lv State Key Laboratory of Information Security Institute of Information EngineeringChinese Academy of SciencesBeijing 100093China Data Assurance Communication Security Research Center Chinese Academy of SciencesBeijing 100093China School of Cyber Security University of Chinese Academy of SciencesBeijing 100093China

The discrete logarithm problem(DLP)is to find a solution n such that g^n=h in a finite cyclic group G=,where h∈G.The DLP is the security foundation of many cryptosystems,such as RSA.We propose a method to improve Pollard’s kangaroo algorithm,which is the classic algorithm for solving the DLP.In the proposed algorithm,the large integer multiplications are reduced by controlling whether to perform large integer multiplication.To control the process,the tools of expanding factor and jumping distance are introduced.The expanding factor is an indicator used to measure the probability of collision.Large integer multiplication is performed if the value of the expanding factor is greater than the given bound.The improved algorithm requires an average of(1.633+o(1))q(1/2)times of the large integer multiplications.In experiments,the average large integer multiplication times is approximately(1.5+o(1))q(1/2).

关键词： discrete logarithm algorithm pollard’s kangaroo algorithm jumping distance

Smart Fibers for Self‑Powered Electronic Skins

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Advanced Fiber Materials 2023年第2期5卷 401-428页

作者： Xiaoshuang lv Yang Liu Jianyong Yu Zhaoling Li bin Ding Shanghai Frontier Science Research Center for Modern Textiles College of TextilesDonghua UniversityShanghai 201620China College of Information Science and Technology Donghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 200051China

Smart fibers are considered as promising materials for the fabrication of wearable electronic skins owing to their features such as superior flexibility,light weight,high specific area,and ease of modification.Besides,piezoelectric or triboelectric electronic skins can respond to mechanical stimulation and directly convert the mechanical energy into electrical power for self-use,thereby providing an attractive method for tactile sensing and motion perception.The incorporation of sensing capabilities into smart fibers could be a powerful approach to the development of self-powered electronic skins.Herein,we review several aspects of the recent advancements in the development of self-powered electronic skins constructed with smart fibers.The summarized aspects include functional material selection,structural design,pressure sensing mechanism,and proof-to-concept demonstration to practical application.In particular,various fabrication strategies and a wide range of practical applications have been systematically introduced.Finally,a critical assessment of the challenges and promising perspectives for the development of fiber-based electronic skins has been presented.

关键词： Smart fibers Electronic skins Self-power Piezoelectric effect Triboelectric effect

Transition Metal Boride-Based Materials for Electrocatalytic Water Splitting

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Chinese Journal of Structural Chemistry 2022年第9期41卷 8-44页

作者： Feng-Ge Wang Xin Liu Qian-Xi lv bin Liu Yong-Ming Chai bin Dong State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China

Electrocatalytic water splitting to produce hydrogen is an eco-friendly way to achieve sustainable utilization of renewable energy.The industrial application of water electrolysis, which is severely limited by slow kinetic reactions on electrode surfaces, requires the development of highly reactive, low-cost and stable electrocatalytic materials. Transition metal borides/borates have recently emerged as promising electrocatalytic materials for catalyzing hydrogen/oxygen evolution reactions(HER/OER) in inexpensive electrolyzers. However, so far, there has been little comprehensive summary of transition metal borides/borates. Here, this review provides the latest research progress on transition metal borides/borates for electrocatalytic water splitting. The structural characteristics of transition metal borides/borates and their synthesis methods in recent years are discussed. Then, the theoretical and experimental progress of transition metal borides including single-metal borides, multi-metal borides, borate derived and other nanocomposites containing boron(boron-doped nanocomposites/substrate with boron) in electrocatalytic reaction and the role of boron in regulating electrocatalytic performance are further emphasized. Finally, the potential challenges and future prospects of transition metal borides/borates in electrocatalysis are presented.

关键词： transition metal borides/borates electrocatalysts hydrogen evolution reaction(HER) oxygen evolution reaction(OER) overall water splitting

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城市生态隔离区规划管理对策

规划师 2016年第7期32卷 45-51页

作者：唐婷吕斌张文新北京大学城市与环境学院成都市规划设计研究院规划五所

随着生态文明建设上升到国家战略、城市规划走向城乡规划,城镇建设区以外地区的规划管理向标准化、法制化转变成为一个迫切需要解决的问题。但是,目前该类地区的规划管理体系还未建立,而且该类地区规划管理的内容和机制与现有的规划管... 详细信息

随着生态文明建设上升到国家战略、城市规划走向城乡规划,城镇建设区以外地区的规划管理向标准化、法制化转变成为一个迫切需要解决的问题。但是,目前该类地区的规划管理体系还未建立,而且该类地区规划管理的内容和机制与现有的规划管理体系并不相容。为此,成都市在生态隔离区内开展了一系列的探索,从区域资源条件和管理目标出发,围绕规划管理的手段和该类地区的特点,提出了规划管理的技术体系和核心内容,为类似地区的规划管理提供了重要的经验。

关键词：生态隔离区规划管理技术体系生态格局成都市

Hetero‑Interfaces on Cu Electrode for Enhanced Electrochemical Conversion of CO_(2)to Multi‑Carbon Products

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Nano-Micro Letters 2022年第8期14卷 181-193页

作者： Xiaotong Li Jianghao Wang Xiangzhou lv Yue Yang Yifei Xu Qian Liu Hao bin Wu Institute for Composites Science Innovation(InCSI)and State Key Laboratory of Silicon Materials School of Materials Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Electrochemical CO_(2)reduction reaction(CO_(2)RR)to multi-carbon products would simultaneously reduce CO_(2)emission and produce high-value chemicals.Herein,we report Cu electrodes modified by metal–organic framework(MOF)exhibiting enhanced electrocatalytic performance to convert CO_(2) into ethylene and ethanol.The Zr-based MOF,UiO-66 would in situ transform into amorphous ZrOx nanoparticles(a-ZrO_(x)),constructing a-ZrOx/Cu hetero-interface as a dual-site catalyst.The Faradaic efficiency of multi-carbon(C2+)products for optimal UiO-66-coated Cu(0.5-UiO/Cu)electrode reaches a high value of 74%at−1.05 V versus RHE.The intrinsic activity for C2+products on 0.5-UiO/Cu electrode is about two times higher than that of Cu foil.In situ surface-enhanced Raman spectra demonstrate that UiO-66-derived a-ZrO_(x)coating can promote the stabilization of atop-bound CO^(*)intermediates on Cu surface during CO_(2)electrolysis,leading to increased CO^(*)coverage and facilitating the C–C coupling process.The present study gives new insights into tailoring the adsorption configurations of CO_(2)RR intermediate by designing dual-site electrocatalysts with hetero-interfaces.

关键词： CO_(2)reduction reaction Metal–organic frameworks Copper Hetero-interfaces Multi-carbon products

Research on Weapon Equipment Civil-Military Integration Development Mode Based on Fuzzy Petri Net

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Research on Weapon Equipment Civil-Military Integration Deve...