检索结果-南通市图书馆

基于后悔理论-VIKOR法的微电网规划评价方法

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

电气传动 2024年第2期54卷 65-73页

作者：李睿哲吴鸣刘诗语上海电力大学电子与信息工程学院上海200090 中国电力科学研究院有限公司北京100192

针对现有微电网规划评价方法在评价过程中未能充分考虑系统与环境中不确定因素对于评价结果影响的问题,提出一种基于后悔理论-多准则妥协解排序法(VIKOR)的微电网规划评价方法。首先,考虑微电网规划阶段的需求,构建了包含系统经济性、... 详细信息

针对现有微电网规划评价方法在评价过程中未能充分考虑系统与环境中不确定因素对于评价结果影响的问题,提出一种基于后悔理论-多准则妥协解排序法(VIKOR)的微电网规划评价方法。首先,考虑微电网规划阶段的需求,构建了包含系统经济性、环保性与技术性等在内的微电网规划评价指标体系;而后,顾及专家主观经验与指标客观数据所包含的信息,采用层次分析法(AHP)-相关性定权法(CRITIC)对指标体系进行主客观组合赋权;最后,考虑不确定因素对评价结果的影响,基于后悔理论在评价过程中引入欣喜-后悔函数与状态变量对VIKOR法进行改进,建立了基于后悔理论-VIKOR法的微电网规划评价模型。算例分析表明,所提评价方法考虑系统与环境中不确定因素以及决策者心理预期对于规划方案评价结果的影响,贴近于实际的微电网的规划方案决策需求。

关键词：微电网综合评价后悔理论 VIKOR法

在线全文

学校读者我要写书评

暂无评论

牦牛基因组拷贝数变异研究进展

畜牧兽医学报 2024年第3期55卷 933-943页

作者：徐东辉徐宇辉李瑞哲成海建马志杰青海大学畜牧兽医科学院西宁810016 农业农村部青藏高原畜禽遗传育种重点实验室西宁810016 青海省高原家畜遗传资源保护与创新利用重点实验室西宁810016 山东省农业科学院畜牧兽医研究所济南250100 山东省畜禽疫病防治与繁育重点实验室济南250100

拷贝数变异(copy number variation, CNV)是基因组结构变异(structural variation, SV)的重要组成部分。与SNP(single nucleotide polymorphism)相比,CNV显示出更丰富的复杂遗传变异,在家畜重要经济性状遗传机理、疾病诱因和物种进化等... 详细信息

拷贝数变异(copy number variation, CNV)是基因组结构变异(structural variation, SV)的重要组成部分。与SNP(single nucleotide polymorphism)相比,CNV显示出更丰富的复杂遗传变异,在家畜重要经济性状遗传机理、疾病诱因和物种进化等研究方面具有重要意义。牦牛作为青藏高原的重要牛种,近年来随着高通量测序技术的快速发展和参考基因组的不断升级,其全基因组水平上CNV的研究获得重要进展。本文在阐述基因组CNV的形成原理、作用机制和检测方法基础上,综述了近10年来牦牛基因组CNV的研究现状,分析探究了存在的一些问题与不足,并对其未来的发展和应用趋势进行了展望,以期为深入开展牦牛基因组研究和加速牦牛遗传资源的分子育种进程提供参考。

关键词：牦牛基因组拷贝数变异(CNV)

Metal–Organic Gel Leading to Customized Magnetic‑Coupling Engineering in Carbon Aerogels for Excellent Radar Stealth and Thermal Insulation Performances

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2024年第3期16卷 36-52页

作者： Xin li ruizhe Hu Zhiqiang Xiong Dan Wang Zhixia Zhang Chongbo liu Xiaojun Zeng Dezhi Chen Renchao Che Xuliang Nie Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle Nanchang Hangkong UniversityNanchang 330063People’s Republic of China School of Environmental and Chemical Engineering Nanchang Hangkong UniversityNanchang 330063People’s Republic of China Laboratory of Advanced Materials Department of Materials Science and Collaborative Innovation Center of Chemistry for Energy Materials and Collaborative Innovation Center of Chemistry for Energy MaterialsFudan UniversityShanghai 200438People’s Republic of China School of Materials Science and Engineering Jingdezhen Ceramic UniversityJingdezhen 333403People’s Republic of China College of Chemistry and Materials Jiangxi Agricultural UniversityNanchang 330045People’s Republic of China

Metal–organic gel(MOG)derived composites are promising multi-functional materials due to their alterable composition,identifiable chemical homogeneity,tunable shape,and porous structure.Herein,stable metal–organic hydrogels are prepared by regulating the complexation effect,solution polarity and curing speed.Meanwhile,collagen peptide is used to facilitate the fabrication of a porous aerogel with excellent physical properties as well as the homogeneous dispersion of magnetic particles during calcination.Subsequently,two kinds of heterometallic magnetic coupling systems are obtained through the application of Kirkendall effect.FeCo/nitrogen-doped carbon(NC)aerogel demonstrates an ultra-strong microwave absorption of−85 dB at an ultra-low loading of 5%.After reducing the time taken by atom shifting,a FeCo/Fe3O4/NC aerogel containing virus-shaped particles is obtained,which achieves an ultra-broad absorption of 7.44 GHz at an ultra-thin thickness of 1.59 mm due to the coupling effect offered by dual-soft-magnetic particles.Furthermore,both aerogels show excellent thermal insulation property,and their outstanding radar stealth performances in J-20 aircraft are confirmed by computer simulation technology.The formation mechanism of MOG is also discussed along with the thermal insulation and electromagnetic wave absorption mechanism of the aerogels,which will enable the development and application of novel and lightweight stealth coatings.

关键词： Metal-organic gels Heterometallic magnetic coupling Radar stealth Thermal insulation Computer simulation technology

基于mtDNA D-loop序列分析青海省果洛州牦牛遗传资源的母系遗传多样性及群体遗传结构

在线全文

学校读者我要写书评

暂无评论

中国农业大学学报 2024年第8期29卷 134-146页

作者：曹萍梅萨陈生梅李鸿康郭卫兴李瑞哲达桑才加莫延新官却扎西忠尕李文浩刘书杰崔宏伟马志杰青海大学畜牧兽医科学院/青海省高原家畜遗传资源保护与创新利用重点实验室/农业农村部青藏高原畜禽遗传育种重点实验室青海省果洛州班玛县畜牧兽医站青海省牦牛繁育推广服务中心青海省果洛州久治县索乎日麻乡畜牧兽医站青海省果洛州玛多县花石峡镇措柔村拉泽生态畜牧业专业合作社青海省畜禽遗传资源保护利用中心青海省果洛州农牧和科技局

为从分子水平上对青海省果洛藏族自治州牦牛遗传资源进行系统评估，分析其母系遗传多样性、群体遗传结构和群体遗传分化，本研究对甘德、班玛、久治和玛多牦牛群体共152头个体进行线粒体DNA(mtDNA)Dloop区测序，并从GenBank下载已公布... 详细信息

为从分子水平上对青海省果洛藏族自治州牦牛遗传资源进行系统评估，分析其母系遗传多样性、群体遗传结构和群体遗传分化，本研究对甘德、班玛、久治和玛多牦牛群体共152头个体进行线粒体DNA(mtDNA)Dloop区测序，并从GenBank下载已公布的37条达日牦牛和32条玛沁牦牛的相应序列，对这6个牦牛群体mtDNA D-loop序列进行综合分析。结果表明：1)221条牦牛mtDNA D-loop序列（636～638 bp）比对分析共检测出57个变异位点，包括8个单一多态位点和49个简约信息位点。根据D-loop序列间核苷酸变异共确定了45种单倍型，其中班玛、达日、甘德、久治、玛多、玛沁牦牛群体分别拥有1、6、5、4、7、6种特有单倍型。2)6个牦牛群体总的单倍型多样度和核苷酸多样度为0.901和0.014，表明其母系遗传多样性丰富。其中，甘德牦牛的单倍型多样度最高（Hd=0.951），久治牦牛的单倍型多样度最低（Hd=0.818）。3）遗传分化和基因流分析表明，除久治牦牛与班玛、甘德、玛沁牦牛群体间分化程度均呈中等遗传分化水平（0.05≤FST<0.15），基因交流相对贫乏外，其他牦牛群体间FST值较小（0更多还原AbstractFilter('ChDivSummary', 'ChDivSummaryMore', 'ChDivSummaryReset');

关键词：牦牛 mtDNA D-loop区遗传多样性遗传分化群体结构系统发育

lightweight foam-like nitrogen-doped carbon nanotube complex achieving highly efficient electromagnetic wave absorption

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 Materials Science & Technology 2024年第1期168卷 114-123页

作者： Zongcheng li Jin liang Zhiheng Wei Xin Cao Jiahui Shan Chunwei li Xiaoyi Chen Dong Zhou ruizhe Xing Chunjia Luo Jie Kong MOE Key Lab of Materials Physics and Chemistry in Extraordinary Conditions Shaanxi Key Laboratory of Macromolecular Science and TechnologySchool of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Key laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical UniversityNingbo 315103China Polymer Materials and Engineering Department School of Materials Science and EngineeringChang’an UniversityXi’an 710064China

With the increased electromagnetic wave(EMW)threat to military and human health,the develop-ment of EMW-absorbing materials is crucial.Metal-organic framework derivatives containing magnetic nanoparticles and a carbon matrix are potential candidates for designing efficient EMW-absorbing mate-rials.Herein,a zeolitic imidazolate framework-67(ZIF-67)-embedded three-dimensional melamine foam is pyrolyzed to afford carbon foam-based nitrogen-doped carbon nanotube composites,named 3D foam-like CoO/Co/N-CNTs.Magnetic CoO/Co particles are confined in the dielectric carbon nanotube skeleton.The carbon nanotubes provide considerable conductive loss,while CoO/Co magnetic particles are con-ducive to providing magnetic loss and adjusting impedance matching.Moreover,the numerous defect structures introduced by heteroatomic doping(nitrogen)cause dipole polarization and simultaneously adjust impedance matching.Meanwhile,the unique porous nanotube structure promotes multiple re-flections and scattering of EMWs,further optimizing impedance matching.CoO/Co/N-CNTs composites exhibit a minimum reflection loss of−52.3 dB at a matching thickness of 2.0 mm,while the correspond-ing effective absorption bandwidth is 5.28 GHz at a matching thickness of 2.2 mm.This study reports a novel approach to fabricating a lightweight high-performance EMW-absorbing material.

关键词： lightweight porous carbon materials Carbon nanotubes CoO/Co magnetic particles Electromagnetic synergistic effect Impedance matching

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

天祝白牦牛全线粒体基因组母系遗传多样性

青海大学学报 2024年第2期42卷 28-34页

作者：曹萍徐宇辉刘瑞林陈生梅李瑞哲薛斌马志杰青海大学畜牧兽医科学院青海省高原家畜遗传资源保护与创新利用重点实验室青海西宁810016 农业农村部青藏高原畜禽遗传育种重点实验室青海西宁810016

为从基因组水平上揭示天祝白牦牛的母系遗传多样性、群体遗传结构和母系遗传背景,本研究利用基因组重测序技术,测定42头天祝白牦牛的全基因组序列,获取其线粒体基因组全序列,并从GenBank中下载1条已公布的天祝白牦牛线粒体基因组全序列... 详细信息

为从基因组水平上揭示天祝白牦牛的母系遗传多样性、群体遗传结构和母系遗传背景,本研究利用基因组重测序技术,测定42头天祝白牦牛的全基因组序列,获取其线粒体基因组全序列,并从GenBank中下载1条已公布的天祝白牦牛线粒体基因组全序列,对共计43条天祝白牦牛线粒体基因组全序列进行综合分析。结果表明:从43条天祝白牦牛线粒体基因组全序列中共识别出971个变异位点,包括25个单一多态位点和946个简约信息位点;通过序列间核苷酸变异确定了20种单倍型,单倍型多样度和核苷酸多样度分别为0.907和0.013,表明天祝白牦牛拥有较为丰富的母系遗传多样性。与野牦牛及环湖、雪多、玉树、青海高原、帕米尔等牦牛品种相比,天祝白牦牛母系遗传多样性相对较低。利用美洲野牛作为参考外群进行系统发育分析,20种单倍型分布于5种单倍型组(A、B、C、E和G)中,归属于3个母系遗传支系(Mt-Ⅰ、Mt-Ⅱ和Mt-Ⅲ),以Mt-Ⅰ支系为主,推测其有3个母系起源。

关键词：天祝白牦牛线粒体基因组遗传多样性群体结构系统发育

Effect of Support on Catalytic Performance of Photothermal Fischer-Tropsch Synthesis to Produce Lower Olefins over FesC2-based Catalysts

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2020年第6期36卷 1006-1012页

作者： li Yuan li ruizhe li Zhenhua WEI Weiqin OUYANG Shuxin YUAN Hong ZHANG Tierui College o f Chemistry Central China Normal UniversityWuhan 430079P.R.China

Photothermal Fischer-Tropsch synthesis(FTS)has been extensively studied,but few reports were focused on systematically exploring the influence of support on catalytic performance.Herein,a series of Fe5C2-based catalysts with different supports was fabricated via a one-step wet-chemical method for photothermal conversion of syngas to lower olefins.Under light irradiation,the optimized FesC2/a-Al2O3 catalyst demonstrated remarkable photothermal FTS activity,delivering selectivity to lower olefins of 50.3%with a CO conversion rate of 52.5%.Characterization studies using X-ray diffraction and Mossbauer spectroscopy analysis revealed that the active catalyst mainly contained FesC2 nanoparticles on a-AbO3 support.It was found that the weak interaction between active phase and a-AhO3 could promote the formation of FesC2,which contributed to the high selectivity to lower olefins.

关键词： x-FesC2 catalyst Fischer-Tropsch synthesis Metal-support interaction Photothermal catalysis

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

中美外商投资统计制度比较及启示

国际贸易 2023年第3期 11-17页

作者：李睿哲张威商务部国际贸易经济合作研究院

当前,我国利用外资的国内外形势发生了深刻变化,现行外商投资统计制度已不适应我国《外商投资法》的相关规定和新发展阶段利用外资的重点和方向,客观上要求加快调整和完善外商投资统计制度。美国按照OECD发布的《外国直接投资基准定义(... 详细信息

当前,我国利用外资的国内外形势发生了深刻变化,现行外商投资统计制度已不适应我国《外商投资法》的相关规定和新发展阶段利用外资的重点和方向,客观上要求加快调整和完善外商投资统计制度。美国按照OECD发布的《外国直接投资基准定义(第四版)》(BD4)和IMF发布的《国际收支和国际投资头寸手册(第六版)》(BPM6)规定的统计原则、统计方法和统计内容,构建了国际收支与直接投资头寸统计、跨国企业活动统计和新增外商投资统计三套外商投资统计制度,在统计调查制度、统计内容以及统计发布和制度修订等方面对完善我国现行外商投资统计制度都具有借鉴意义。我国应针对现行外商投资统计制度存在的不足,积极借鉴美国的经验和做法,并根据新形势下我国外商投资管理的重点和方向,完善与利用外资新发展阶段相适应、与国际接轨的“全口径”“全周期”“全流程”外商统计体系。

关键词：外商投资统计制度新增外商投资统计收益再投资

A study on coupling technique and implementation of the wave-circulation coupled model

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

High Technology Letters 2014年第1期20卷 82-87页

作者：张志远 liu li Zhou Yufeng Zhang Cheng li ruizhe Chen Yushu Song Guojie Yang Guangwen Department of Computer Science and Technology Tsinghua University Ministry of Education Key Laboratory for Earth System Modeling Center for Earth System ScienceTsinghua University Hydro-Meteorological Center of Navy

The coupler is fundamental for a coupled model to realize complex interactions among component models.This paper focuses on the coupling process of Wave-Circulation(W-C) coupled model which consists of MASNUM(key laboratory of marine science and numerical modeling wave model)and POM(Princeton Ocean Model).The current coupling module of this coupled model is based on the inefficient I/O file,which has already become a performance bottleneck especially when the coupled model utilizes a large number of processes.To improve the performance of the W-C model,a flexible coupling module based on the model coupling toolkit(MCT) is designed and implemented to replace the current I/O file coupling module in the coupled model.Empirical studies that we have carried out demonstrate that our online coupling module can dramatically improve the parallel performance of the coupled model.The online coupling module outperforms the I/O file coupling module.When processes increase to 96,the whole process of EXP-C takes only 695.8 seconds,which is only 58.8%of the execution time of EXP-F.Based on our experiments under 2D Parallel Decomposition(2DPD),we suggest setting parallel decomposition strategies automatically to component models in order to achieve high parallel efficiency.

关键词：耦合模型联用技术重点实验室环流性能瓶颈并行分解耦合模式相互作用