检索结果-南通市图书馆

Co_(2)N Nanoparticles Anchored on N-Doped Active Carbon as Catalyst for Oxygen Reduction Reaction in Zinc–Air Battery

在线全文

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2022年第3期5卷 935-943页

作者： Xianli Wu Guosheng Han Hao Wen Yanyan Liu Lei Han xingyu cui Jiajing Kou Baojun Li Jianchun Jiang Research Center of Green Catalysis College of ChemistryZhengzhou University100 Science RoadZhengzhou 450001China National Engineering Laboratory for Biomass Chemical Utilization Institute of Chemical Industry of Forest ProductsChinese Academy of ForestryNanjing 210042China College of Science Henan Agricultural UniversityZhengzhou 450002China Davidson School of Chemical Engineering Purdue University480 Stadium Mall DriveIN 47906United States State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University28 Xianning West RoadXi'an 710049China

The development of efficient catalytic electrode toward oxygen reduction reaction(ORR)is still a great challenge for the wide use of zinc–air ***,Co_(2)N nanoparticles(NPs)anchored on N-doped carbon from cattail were verified with excellent catalytic performances for *** onset and half-wave potentials over the optimal catalyst reach to 0.96 V and 0.84 V,*** retention rates of 96.8%after 22-h test and 98.8%after running 1600 s were obtained in 1 M methanol *** functional theory simulation proposes an apparently increased electronic states of Co_(2)N in N-doped carbon layer close to the Fermi *** charge density,favorable adsorption,and charge transfer of intermediates originate from the coexistence of Co_(2)N NPs and N atoms in carbon *** superior catalytic activity of composites also was confirmed in zinc–air *** novel catalytic property and controllable preparation approach of Co_(2)Ncarbon composites provide a promising avenue to fabricate metal-containing catalytically active carbon from biomass.

关键词： catalytically active carbon Co2N nanoparticles N-doping oxygen reduction reaction zinc–air battery

A Multi-population Coevolution Multi-objective Particle Swarm Optimization Algorithm

在线全文

学校读者我要写书评

暂无评论

A Multi-population Coevolution Multi-objective Particle Swar...

Multi-subpopulation coevolutionary algorithm with adaptive Cauchy-Polynomial mutation

第40届中国控制会议

作者： Jiawei He Huifeng Zhang xingyu cui Institute of Advanced Technology Nanjing University of Posts and Telecommunications

In this paper, a multi-population coevolution multi-objective particle swarm optimization（MPCMOPSO） algorithm is proposed. In the proposed algorithm, multiple subpopulations and an inferior population are used to search jointly, which strengthens the utilization of inferior particles and not only improves the efficiency of the algorithm, but also effectively improves the convergence and searching ability of the algorithm. Archive set is used to retain non-dominated paticles to realize information exchange between subpopulations and the inferior population, where non-dominated particles in the archive set are used to replace the inferior particles. Moreover, a strategy to prevent particles from falling into local optima is proposed. Finally,experiment results on ZDTs series functions and comparison with other algorithms are given to validate the proposed algorithm.

关键词： multiple subpopulations inferior particles cooperative convergence archive set ZDTs

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Multi-subpopulation coevolutionary algorithm with adaptive C...

表观扩散系数和MRI体素内不相干运动参数值在肝外胆管癌病理分级中的价值

第40届中国控制会议

作者： xingyu cui Huifeng Zhang Jiawei He Institute of Advanced Technology Nanjing University of Posts and Telecommunications

In order to solve the difficulties of multiobjective optimization problems（MOPs） such as high dimensionality and complex calculation, this paper designs a multiobjective optimization algorithm of multi-subpopulation coevolution. In this paper,the MOPs is divided into several sub-problems, and multiple sub-populations are used to optimize the sub-problems separately,and an information exchange strategy is designed for coevolution among multiple subpopulations;Aiming at the problem of multiobjective particle swarm optimization easily falling into local optima, an adaptive Cauchy mutation is designed to enhance the diversity and convergence of the algorithm.

关键词： Particle swarm optimization multiple subpopulations information exchange strategy adaptive Cauchy mutation

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

中华放射学杂志 2015年第12期49卷 917-921页

作者：邢春华陈宏伟崔兴宇南京医科大学附属无锡市人民医院医学影像科 214023

目的探讨DWI的ADC值及体素内不相干运动（IVIM）相关参数值在肝外胆管癌（EHCC）病理分级中的价值。方法回顾性分析经手术病理证实为EHCC，术前行上腹部常规MRI平扫和DWI检查，且病灶最小直径〉5mm的38例患者资料。将扫描原始图像导入I... 详细信息

目的探讨DWI的ADC值及体素内不相干运动（IVIM）相关参数值在肝外胆管癌（EHCC）病理分级中的价值。方法回顾性分析经手术病理证实为EHCC，术前行上腹部常规MRI平扫和DWI检查，且病灶最小直径〉5mm的38例患者资料。将扫描原始图像导入IVIM图像后处理软件，每例患者各放置3次ROI，3次时间间隔均为1周，在病灶最大层面实性部分同一位置选取尽可能大面积的ROI,测量病灶ADC、血流量（BF）、体素内真性水分子扩散（D）、体素内微循环灌注（D^＊）、灌注分数（f）值，取3次的平均值。对手术标本按照消化系统肿瘤WHO分类分级法，分为Ⅰ、Ⅱ、Ⅲ级。采用Spearman相关分析评价ADC值及IVIM参数与EHCC病理分级的相关性，采用ROC曲线分析ADC、BF、D、D^＊、f值诊断EHCC病理分级的效能。结果38例EHCC中，Ⅰ、Ⅱ、Ⅲ级分别为11、15、12例。Ⅰ、Ⅱ、Ⅲ级EHCC的ADC值分别为（1．33±0．22）×10^-3、（1．21±0．18）×10^-3、（0．98±0．10）×10^-3mm／s^2，BF值分别为（2．40±1．01）×10^-3、（2．37±1．19）×10^-3、（1．64±0．46）×10^-3mm／s^2，D值分别为（1．30±0．13）×10^-3、（1．15±0．13）×10^-3、（0．87±0．11）×10^-3mm/s^2，D^2值分别为（5．67±0．70）×10^-3、（6．58±1．82）×10^-3、（5．43±2．82）×10^-3mm／s^2，f值分别为（38．03±10．02）％、（31．36±8．34）％、（22．04±7．93）％。ADC、D、f值和病理分级具有相关性（r值分别为0．624、0．809和0．580，P值均〈0．01）；BF、D^＊值和病理分级间无相关性（r值分别为0．27l、0．017，P值分别为0．099、0．920）。ADC、BF、D、D^＊、f值诊断EHCC病理分级的ROC曲线下面积分别为0．785、0．603、0．889、0．421、0．781。结论随着EHCC分化程度的降低，ADC、D、f值均降低。f值与病理分化程度相关性较低，ADC、D值相关性好，D值的相关性最高。

关键词：胆管肿瘤磁共振成像病理学

MR动态增强联合DWI对肝外胆管癌T分期的诊断价值

在线全文

学校读者我要写书评

暂无评论

临床放射学杂志 2015年第6期34卷 912-917页

作者：邢春华陈宏伟崔兴宇南京医科大学附属无锡市人民医院医学影像科无锡214023

目的探讨MR动态增强联合扩散加权成像（DWI）对肝外胆管癌（EHCC）T分期的诊断价值。方法回顾性分析经病理证实的39例EHCC患者术前MR动态增强和DWI扫描资料。依据病变的形态、部位、胆管浸润范围、周围血管、邻近器官或组织的侵犯情况... 详细信息

目的探讨MR动态增强联合扩散加权成像（DWI）对肝外胆管癌（EHCC）T分期的诊断价值。方法回顾性分析经病理证实的39例EHCC患者术前MR动态增强和DWI扫描资料。依据病变的形态、部位、胆管浸润范围、周围血管、邻近器官或组织的侵犯情况等进行T分期,并与术后病理学分期结果进行对照。结果 39例EHCC病理分期为：T1期8例,T2期14例,T3期15例,T4期2例。MR动态增强评价T分期结果为：T1期7例,T2期17例,T3期14例,T4期1例,MR动态增强诊断准确率为84.62%（33/39）;DWI评价T分期为：T1-2期23例,T3期14例,T4期2例,诊断准确率为79.49%（31/39）;两者联合评价T分期为：T1期8例,T2期13例,T3期16例,T4期2例,总诊断准确率为94.87%（37/39）,与病理学T分期间一致性检验好（Kappa=0.924,P〈0.001）。结论 MR动态增强联合DWI扫描可以提高EHCC T分期诊断准确性。

关键词： T分期扩散加权成像磁共振成像动态增强肝外胆管癌

在线全文

学校读者我要写书评

暂无评论

优化原理图逻辑清晰度的启发式布局布线算法

华中科技大学学报（自然科学版） 2024年第11期52卷 50-57页

作者：王刚崔星语冯朝芃李桢荣南开大学计算机学院天津300350 北京华大九天科技股份有限公司北京100102

针对电路自动化设计(EDA)领域中如何将网表文件转化成原理图,以便设计人员迅速理解电路结构这一问题,提出一套高效的优化原理图逻辑清晰度的启发式布局布线算法(HALCS),由解析网表文件、布局、布线和绘图这4个部分组成.在布局和布线两... 详细信息

针对电路自动化设计(EDA)领域中如何将网表文件转化成原理图,以便设计人员迅速理解电路结构这一问题,提出一套高效的优化原理图逻辑清晰度的启发式布局布线算法(HALCS),由解析网表文件、布局、布线和绘图这4个部分组成.在布局和布线两个重点部分,提出双向值传播布局优化策略、基于动态规划的列内伸展留白布局优化策略和以通线为基本单位的布线策略.实验结果表明:HALCS算法对于数个到数百个元件的电路能在0.05~75 ms的时间内输出结果,有效满足了实时展示电路结构、排查错误等工程需求.

关键词：电路布局布线原理图电路自动化设计(EDA) 值传播算法逻辑清晰度

在线全文

学校读者我要写书评

暂无评论

纳米NaY分子筛的合成优化

石油学报（石油加工） 2016年第3期32卷 477-485页

作者：常彦斌王健崔杏雨陈树伟李瑞丰太原理工大学化学化工学院山西太原030024 太原理工大学精细化工研究所山西太原030024

以工业级水玻璃为硅源,在无模板剂、无导向剂、无添加剂的条件下,成功地合成了粒径小于100nm的NaY分子筛,并采用XRD、FT-IR、SEM、粒度分析、N2吸附-脱附、ICP、29Si和27 Al NMR等手段对其进行表征。考察了合成体系中n(Na_2O)/n(Al_2O_3... 详细信息

以工业级水玻璃为硅源,在无模板剂、无导向剂、无添加剂的条件下,成功地合成了粒径小于100nm的NaY分子筛,并采用XRD、FT-IR、SEM、粒度分析、N2吸附-脱附、ICP、29Si和27 Al NMR等手段对其进行表征。考察了合成体系中n(Na_2O)/n(Al_2O_3)、n(H2O)/n(Al_2O_3)及初始凝胶陈化温度与陈化时间对NaY分子筛晶粒大小的影响,并与常规工业NaY进行比较。结果表明,增大n(Na_2O)/n(Al_2O_3),有利于减小NaY分子筛的晶粒尺寸,但同时也降低了其相对结晶度,当n(Na_2O)/n(Al_2O_3)大于17时,导致NaY分子筛向P型分子筛转变;降低n(H_2O)/n(Al_2O_3),有利于生成小晶粒NaY分子筛,但当n(H2O)/n(Al_2O_3)低于240时,就会出现P型杂晶。NaY分子筛的平均粒径随着初始凝胶陈化温度的升高而减小,但当陈化温度达到70℃时,得到P型分子筛产物;随着初始凝胶陈化时间的延长,NaY分子筛的粒径逐渐变小,陈化时间长于5h时,就会出现P型杂晶。在n(Na_2O)/n(Al_2O_3)为16、n(H_2O)/n(Al_2O_3)为360、65℃陈化4h的优化合成条件下,合成了平均粒径在80nm左右且粒度分布较窄的NaY分子筛,其骨架nSi/nAl=2.18。

关键词：纳米分子筛 NaY分子筛导向剂碱度合成

Research status and prospects of the fractal analysis of metal material surfaces and interfaces

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 20-38页

作者： Qinjin Dai Xuefeng Liu Xin Ma Shaojie Tian Qinghe cui Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China Beijing Laboratory of Metallic Materials and Processing for Modern Transportation University of Science and Technology BeijingBeijing 100083China Laboratory for Advanced Materials Processing of Ministry of Education University of Science and Technology BeijingBeijing 100083China School of Mechanical and Electrical Engineering Xinjiang Institute of EngineeringUrumqi 830023China

As a mathematical analysis method,fractal analysis can be used to quantitatively describe irregular shapes with self-similar or self-affine *** analysis has been used to characterize the shapes of metal materials at various scales and *** methods make it difficult to quantitatively describe the relationship between the regular characteristics and properties of metal material surfaces and ***,fractal analysis can be used to quantitatively describe the shape characteristics of metal materials and to establish the quantitative relationships between the shape characteristics and various properties of metal *** the perspective of two-dimensional planes and three-dimensional curved surfaces,this paper reviews the current research status of the fractal analysis of metal precipitate interfaces,metal grain boundary interfaces,metal-deposited film surfaces,metal fracture surfaces,metal machined surfaces,and metal wear *** relationship between the fractal dimensions and properties of metal material surfaces and interfaces is *** from three perspectives of fractal analysis,namely,research scope,image acquisition methods,and calculation methods,this paper identifies the direction of research on fractal analysis of metal material surfaces and interfaces that need to be *** is believed that revealing the deep influence mechanism between the fractal dimensions and properties of metal material surfaces and interfaces will be the key research direction of the fractal analysis of metal materials in the future.

关键词： metal material surfaces and interfaces fractal analysis fractal dimension homogeneity

在线全文

学校读者我要写书评

暂无评论

中孔ZSM-5沸石的制备及其催化裂解性能

石油学报（石油加工） 2020年第5期36卷 930-936页

作者：郭思敏高志虹崔杏雨刘宇键李瑞丰太原理工大学化学化工学院山西太原030024 中国石化石油化工科学研究院北京100083

采用碱处理脱硅制备了中孔ZSM-5沸石,考察了不同碱处理方式对ZSM-5沸石的酸性质和孔结构的影响,采用XRD、NH3-TPD、SEM、N2吸附-脱附、FT-IR等手段对碱处理ZSM-5沸石进行表征,研究了碱处理ZSM-5沸石对裂解正构烷烃nC14、1,3,5-三异丙基... 详细信息

采用碱处理脱硅制备了中孔ZSM-5沸石,考察了不同碱处理方式对ZSM-5沸石的酸性质和孔结构的影响,采用XRD、NH3-TPD、SEM、N2吸附-脱附、FT-IR等手段对碱处理ZSM-5沸石进行表征,研究了碱处理ZSM-5沸石对裂解正构烷烃nC14、1,3,5-三异丙基苯和轻柴油裂化反应的催化性能。结果表明:碱处理ZSM-5沸石的中孔比表面积、中孔孔体积以及酸量均比工业ZSM-5沸石有所增加,在催化裂解nC14时,促进了己烷的进一步裂解,提高了产物中戊烷的选择性;在催化裂解1,3,5-三异丙基苯时加深了裂解程度,提高了初级裂解产物二异丙苯和深度裂解产物苯的选择性;在催化裂解轻柴油时,增加了汽油收率。并且,加入TPA+阳离子与NaOH的混合碱液比加入单一的NaOH碱溶液更能促进ZSM-5沸石表面脱硅,使得表面富铝,促进了中孔结构的形成,进一步增大了中孔比表面积和中孔孔体积,增加了酸量,提高了ZSM-5沸石的催化裂解性能。

关键词： ZSM-5沸石碱处理裂解中孔酸量