检索结果-南通市图书馆

A Property of g-probabilities

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2010年第4期26卷 567-574页

作者： Dong-mei Guo zeng-jing chen School of Economics Central University of Finance and EconomicsBeijing 100081China School of Mathematics Shandong UniversityShandong 250100China Department of Financial Engineering Ajou UniversityKorea

Most work on capacities has focused on the 2-alternating and sub *** this paper we consider the capacities-g-probabilities derived from peng＇s *** g satisfies some conditions,we show that the g-probabilities fail to ... 详细信息

关键词： BSDEs g-expectations g-probabilities 2-alternating capacities sub 2-alternating capacities

A New Comparison Theorem of Multidimensional BSDEs

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2015年第1期31卷 131-138页

作者： Pan-yu WU zeng-jing chen Qilu Securities Institute for Financial Studies Shandong University School of Mathematics Shandong University

In this paper, we first study a property about the generator g of Backward Stochastic Differential Equation （BSDE） when the price of contingent claims can be represented by a multidimensional BSDE in the no-arbitrage financial market. Furthermore, motivated by the behavior of agents in finance market, we introduce a new total order q on Rn and obtain a necessary and sufficient condition for comparison theorem of multidimensional BSDEs under this order. We also give some further results for q

关键词： backward stochastic differential equation comparison theorem viability property

Laws of Large Numbers of Negatively Correlated Random Variables for Capacities

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2011年第4期27卷 749-760页

作者： Wen-juan LI zeng-jing chen School of Mathematics Shandong University Jinan 250100 China

Our aim is to present some limit theorems for capacities. We consider a sequence of pairwise negatively correlated random variables. We obtain laws of large numbers for upper probabilities and 2-alternating capacities, using some results in the classical probability theory and a non-additive version of Chebyshev＇s inequality and Boral-Contelli lemma for capacities.

关键词： law of large numbers 2-alternating capacity negatively correlated random variables upper probability

基于谱聚类和增量学习的运动目标物体检测算法研究

在线全文

学校读者我要写书评

暂无评论

西北工业大学学报 2017年第1期35卷 170-176页

作者：黄伟杨文姬曾璟曾舒如陈光南昌大学信息工程学院江西南昌330031 江西农业大学软件学院江西南昌330045 华中光电技术研究所湖北武汉430223 西安通信学院陕西西安710072

运动目标物体检测是计算机视觉领域的热门研究方向之一。该方向的一些复杂问题,例如:环境光照变化、目标物体部分/全遮挡、目标物体刚性/非刚性形变等,仍极具挑战性,并制约检测算法效果的进一步提高。为此,提出了一种新颖的运动目标物... 详细信息

运动目标物体检测是计算机视觉领域的热门研究方向之一。该方向的一些复杂问题,例如:环境光照变化、目标物体部分/全遮挡、目标物体刚性/非刚性形变等,仍极具挑战性,并制约检测算法效果的进一步提高。为此,提出了一种新颖的运动目标物体检测算法。该算法采用了增量学习技术,融合了视频相邻帧在空间和时间上的高相关性,在每个测试帧上都利用其相邻帧的训练数据进行模型的自学习与更新,从而保证了模型在不同环境或复杂背景下能自动调整。为了实现模型学习,还提出并采用了一种新颖的谱聚类技术。该算法通过一个由1 000多帧的视频数据库验证,采用统计学中的方差分析和多重对比等实验手段,综合分析了该算法与其他同类经典算法的效果。通过大量统计分析,结果表明,该新颖检测算法比传统算法在运动目标物体检测的准确性和鲁棒性上都有明显提高。

关键词：算法谱聚类增量学习运动目标物体检测

Highly conductive and stable iodine doped argyrodite electrolyte for all-solid-state lithium batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 50-58页

作者： Gaozhan Liu jing Zhang jing Yang jinghui chen Xingyue Xiao Xiayin Yao Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences

Lithium argyrodites with high ionic conductivity and low cost are considered as one of the most prospective solid electrolytes for all-solid-state lithium ***,the poor chemical stability and compatibility with lithium metal limit their ***,Li5.4PS4.4Cl1.4I0.2solid electrolyte with high ionic conductivity of 11.49 m S cm-1and improved chemical stability is synthesized by iodine *** ultra-thin Li5.4PS4.4Cl1.4I0.2membrane with thickness of 10μm can be obtained by wet coating process,exhibiting a high ionic conductivity of 2.09 mS cm-1and low areal resistance of 1.17Ω***,iodine doping could in-situ form LiI at the lithium/electrolyte interface and improve the critical current density of Li5.4PS4.4Cl1.6from 0.8 to 1.35 mA *** resultant LiCoO2/Li5.4PS4.4Cl1.4I0.2/Li battery shows excellent cycling stability at 1 C,with a reversible specific capacity of 110.1 mA h g-1and a retention of 80.5% after 1000 *** addition,the assembled LiCoO2/Li5.4PS4.4Cl1.4I0.2membrane/Li pouch cell delivers an initial discharge capacity of 110.4 mA h g-1and 80.5% capacity retention after 100 cycles.

关键词： Argyrodite electrolytes Iodine doping Ionic conductivity Stability All-solid-state lithium battery

高速列车转向架构架动应力计算与疲劳全寿命预测

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

交通运输工程学报 2017年第1期17卷 62-70页

作者：卢耀辉向鹏霖曾京陈天利西南交通大学机械工程学院四川成都610031 西南交通大学牵引动力国家重点实验室四川成都610031

建立了车辆结构的刚柔耦合动力学模型,对比了刚性构架和柔性构架的振动响应,计算了构架的载荷谱;分析了应力谱转化方法,利用有限元方法与多项式拟合方法计算了构架的动应力谱;基于动应力谱与相关标准,运用线性累积损伤理论与疲劳裂纹扩... 详细信息

建立了车辆结构的刚柔耦合动力学模型,对比了刚性构架和柔性构架的振动响应,计算了构架的载荷谱;分析了应力谱转化方法,利用有限元方法与多项式拟合方法计算了构架的动应力谱;基于动应力谱与相关标准,运用线性累积损伤理论与疲劳裂纹扩展寿命Paris方程计算了构架的疲劳全寿命。计算结果表明:相比于多刚体车辆系统动力学模型,采用考虑构架柔性的车辆系统动力学模型计算的构架振动加速度响应在构架固有频率36.94~95.53Hz范围内的幅值较大,因此,构架的模态对振动响应的贡献显著;将载荷谱转化为应力谱的多项式拟合方法与瞬态分析方法相比较,应力误差最大值为1.16MPa,相对最大误差为3%,满足工程分析5%的计算精度要求;基于疲劳损伤理论计算的可靠度为95%的构架疲劳寿命为1.82×106 km;构架危险关注点裂纹由1mm扩展到2mm的寿命为1.76×106 km,满足中国高速列车车辆检修标准中制定的五级检修周期为1.2×106 km的要求。可见,构架模态参与下的动态应力谱计算方法与构架的疲劳全寿命预测方法可靠,有益于构架的动态设计与维修周期的制定。

关键词：转向架构架动应力模态疲劳损伤裂纹扩展寿命 S-N曲线

Induction of gynogenesis in red crucian carp using spermatozoa of blunt snout bream

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2007年第2期17卷 163-167页

作者： SUN Yuandong, TAO Min, LIU Shaojun, ZHANG Chun, DUAN Wei, SHEN Jiamin, WANG jing, zeng chen, LONG Yu and LIU Yun (Key Laboratory of Protein Chemistry and Developmental Biology of State Education Ministry of China, College of Life Sciences, Hunan Normal University, Changsha 410081, China) Key Laboratory of Protein Chemistry and Developmental Biology MOE College of Life Sciences Hunan Normal University Changsha 410081 China

Gynogenetic diploid was induced in red crucian carp (RCC) ( Carassius auratus Red Variety) eggs using UV-irradiated spermatozoa from blunt snout bream (B) (Megalobrama amblycephaia) or from mirror carp (C) (Cyprinus carpio. L) . Spermatozoa were genetically inactivated by an appropriate UV dosage, and then the maternal DNA was duplicated with cold shock at 0-4℃. When using the spermatozoa of B, the fertilization rate, hatching rate and survival at first feeding were 52. 6±3. 0 %, 23.6±4.1 % and15.7±3.4 % , respectively, and the survival at first feeding was significantly higher than that (11.3±2.2%) when using the spermatozoa of C (Cyprinus carpio. L). According to the morphological characteristics, the chromosome number and the degree of gonadal development, gynogenetic RCC could be distinguished from the control hybrids of RCC♀×B♂. The individuals with red body color, 100 chromosomes and normal gonadal development were successful gynogenetic RCC, while the individuals with 124 or 148 chromosomes and delayed gonadal development were hybrids of (RCC×B). The triploid hybrids (RCC×B) (2 years old) were sterile, but the tetraploid hybrids (RCC×B) were sexually mature age of two. In the present study, compared to the spermatozoa of C, the advantages of spermatozoa of B as the activation source were that could increase the survival at first feeding of gynogenetic individuals and simplify the confirmation of gynogenetic status, which suggested that the sperm of B was an effective activation source for inducing gynogenesis in crucian carp.

关键词： Megalobrama amblycephala Carassius auratus red variety gynogenesis tetraploid triploid.

Co-production of hydrogen, oxygen, and electricity via an integrated solar-driven system with decoupled water electrolyzer and Na-Zn ion battery

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 621-627页

作者： Fei Lv Longjie Liu Jiazhe Wu Pengfei Wang Lixia Pan Dengwei jing Yubin chen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University

Combining water electrolysis and rechargeable battery technologies into a single system holds great promise for the co-production of hydrogen （H2） and ***,the design and development of such systems is still in its ***,an integrated hydrogen-oxygen （O2）-electricity co-production system featuring a bipolar membrane-assisted decoupled electrolyzer and a Na-Zn ion battery was established with sodium nickelhexacyanoferrate （NaNiHCF） and Zn2+/Zn as dual redox *** decoupled electrolyzer enables to produce H2and O2in different time and space with almost 100%Faradaic efficiency at 100 mA ***,the charged NaNiHCF and Zn electrodes after the electrolysis processes formed a Na-Zn ion battery,which can generate electricity with an average cell voltage of 1.75 V at 10 m A *** connecting Si photovoltaics with the modular electrochemical device,a well-matched solar driven system was built to convert the intermittent solar energy into hydrogen and electric energy with a solar to hydrogen-electricity efficiency of 16.7%,demonstrating the flexible storage and conversion of renewables.

关键词： Hydrogen Electricity Decoupled water electrolyzer Na-Zn ion battery Solar energy

Dielectric-ion-conductive ZnNb2O6 layer enabling rapid desolvation and diffusion for dendrite-free Zn metal batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 693-701页

作者： Haifeng Yang Jian Wang Panpan Zhang Xiaomin cheng Qinghua Guan jing Dong Bixian chen Lujie Jia jing Zhang Yongzheng Zhang Yunjian Liu Hongzhen Lin School of Materials Science and Engineering Jiangsu University i-Lab & CAS Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Helmholtz Institute Ulm (HIU) Karlsruhe Institute of Technology (KIT) School of Materials Science and Engineering Xi'an University of Technology State Key Laboratory of Chemical Engineering East China University of Science and Technology

Rechargeable aqueous zinc-metal batteries （AZMBs） are promising candidates for large-scale energy storage systems due to their low cost and high ***,their performance and sustainability are significantly hindered by the sluggish desolvation kinetics at the electrode/electrolyte interface and the corresponding hydrogen evolution reaction where active water molecules tightly participate in the Zn（H2O）62+solvation ***,learnt from self-generated solid electrolyte interphase （SEI） in anodes,the dielectric but ion-conductive zinc niobate nanoparticles artificial layer is constructed on metallic Zn surface （ZNB@Zn）,acting as a rapid desolvation *** zincophilic and dielectric-conductive properties of ZNB layer accelerate interfacial desolvation/diffusion and suppress surface corrosion or dendrite formation,achieving uniform Zn plating/stripping behavior,as confirmed by electronic/optical microscopies and interface spectroscopical measurements together with theoretical ***,the as-prepared ZNB@Zn electrode exhibits excellent cycling stability of over 2000 h and robust reversibility （99.54%） even under high current density and depth of discharge ***,the assembled ZNB@Zn-based full cell displays high capacity-retention rate of 80.21%after 3000 cycles at 5 A g-1and outstanding rate performance up to 10 A *** large-areal pouch cell is stabilized for hundreds of cycles,highlighting the bright prospects of the dielectric but ion-conductive layer in further application of AZMBs.

关键词： Zn metal battery Dielectric artificial layer Rapid ion diffusion Zincophilic diffusion Active water inhibition