检索结果-南通市图书馆

Dual modulation of homogeneous nanomaterialization and electrochemical activation enhancing zinc ion storage

Science China Chemistry 2025年第1期68卷 385-393页

作者： jianwei Wang Huan Wang Kangning Wang Wenhui Wang Wenlin Zhang Yanzhong Zhen School of Chemistry & Chemical Engineering Yan'an University

Vanadium-based electrode materials are widely investigated,but the low specific capacity and slow electrochemical kinetics in aqueous zinc-ion batteries still limit their commercial ***,the VS2/Ca V4O9material with the morphology of nanoflower was synthesized by a one-step hydrothermal *** to the blocky structure of pure VS2material,the VS2/Ca V4O9material is composed of thinner homogeneous *** open structures could provide abundant electrochemical active sites and ion transport channels,and then promote the electrochemical reaction *** addition,they can also buffer the bulk strain during the reaction *** improve the utilization of vanadium elements,an in-situ electrochemical activation strategy is used to explore the storage performance of the VS2/Ca V4O9material,the different activation voltage range of 0.4–1.6 and 0.4–1.4 V are selected,*** with the longer activation plateau of activated-VS2,the VS2/Ca V4O9cathode could quickly reach the activation state in the range of 1.4–1.6 V and cause the release of additional Zn storage sites *** VS2/Ca V4O9cathode delivers a higher power density of 37,000 W kg-1and a significant energy density of 423 Wh *** the high current density of 15 A g-1,the VS2/Ca V4O9cathode still has a discharge capacity of 183.9m Ah g-1after 5,000 cycles,and the capacity decay rate per cycle is only 0.0042%.Continuous cyclic voltammetry （CV） curves,electrochemical impedance spectroscopy （EIS） measurements,density functional theory （DFT） calculation and galvanostatic intermittent titration technique （GITT） measurements demonstrate that the VS2/Ca V4O9cathode has a faster ion diffusion/charge transfer ***,the assembled flexible device has an excellent mechanical stability.

关键词： dual modulation homogeneous nanomaterialization electrochemical activation zinc ion storage

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

A Cross Attention Transformer-Mixed Feedback Video Recommendation Algorithm Based on DIEN

引用

Computers, Materials & Continua 2025年第1期82卷 977-996页

作者： jianwei Zhang Zhishang Zhao Zengyu Cai Yuan Feng Liang Zhu Yahui Sun College of Software Engineering Zhengzhou University of Light IndustryZhengzhou450000China Faculty of Information Engineering Xuchang Vocational Technical CollegeXuchang461000China College of Computer Science and Technology Zhengzhou University of Light IndustryZhengzhou450000China College of Electronics and Information Zhengzhou University of Light IndustryZhengzhou450000China

The rapid development of short video platforms poses new challenges for traditional recommendation *** systems typically depend on two types of user behavior feedback to construct user interest profiles:explicit feedback(interactive behavior),which significantly influences users’short-term interests,and implicit feedback(viewing time),which substantially affects their long-term ***,the previous model fails to distinguish between these two feedback methods,leading it to predict only the overall preferences of users based on extensive historical behavior ***,it cannot differentiate between users’long-term and shortterm interests,resulting in low accuracy in describing users’interest states and predicting the evolution of their *** paper introduces a video recommendationmodel calledCAT-MFRec(CrossAttention Transformer-Mixed Feedback Recommendation)designed to differentiate between explicit and implicit user feedback within the DIEN(Deep Interest Evolution Network)*** study emphasizes the separate learning of the two types of behavioral feedback,effectively integrating them through the cross-attention ***,it leverages the long sequence dependence capabilities of Transformer technology to accurately construct user interest profiles and predict the evolution of user *** results indicate that CAT-MF Rec significantly outperforms existing recommendation methods across various performance *** advancement offers new theoretical and practical insights for the development of video recommendations,particularly in addressing complex and dynamic user behavior patterns.

关键词： Video recommendation user interest cross-attention transformer

来源：

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

基于简易冲击分解模型的爆轰驱动硅橡胶数值模拟及实验解读

引用

爆炸与冲击 2025年第1期45卷 123-132页

作者：刘军殷建伟张凤国北京应用物理与计算数学研究所北京100094

为了反映爆轰驱动下硅橡胶发生冲击分解反应的物理过程,提出了一种简易的硅橡胶冲击分解模型。基于该模型,对爆轰驱动含硅橡胶夹层钢板实验进行了模拟,并分析解读了钢板的自由面速度。结果表明,实验中硅橡胶发生了冲击分解反应,导致钢... 详细信息

为了反映爆轰驱动下硅橡胶发生冲击分解反应的物理过程,提出了一种简易的硅橡胶冲击分解模型。基于该模型,对爆轰驱动含硅橡胶夹层钢板实验进行了模拟,并分析解读了钢板的自由面速度。结果表明,实验中硅橡胶发生了冲击分解反应,导致钢板的自由面速度曲线出现了首次起跳中间速度平台及首次起跳速度峰值降低的现象。受硅橡胶冲击分解影响,首次入射波压力将在临界冲击分解压力附近弛豫一段时间,再继续升高至最高压力。该压力波作用于钢板的自由面后,出现了自由面速度在中间速度平台停留一段时间,之后继续升高至速度峰值的现象。硅橡胶冲击分解后的气相物质可压缩性较高,首次加载波内较多的能量被用于压缩气体做功,导致首次波传播至自由面时能量衰减,峰值压力降低,首次起跳速度峰值降低。

关键词：硅橡胶爆轰驱动冲击分解分解压力

来源：

维普期刊数据库

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Progress of the Quantum Experiment Science Satellite(QUESS) Micius Project

引用

空间科学学报 2018年第5期38卷 604-609页

作者： Pan jianwei Department of Modern Physics and Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei 230026 CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Shanghai 201315

By using satellites, ultra-long-distance quantum communication and tests of quantum foundations could be achieved at a global scale. The Quantum Experiment Science Satellite(QUESS) in China, also called Micius, one of the scientific satellite programs in the Strategic Priority Program on space science, the Chinese Academy of Sciences, was launched on 16 August 2016. There are totally 4 scientific payloads. We give a brief overview of the quantum experiment science satellite project and present most recent science results. The main scientific goal of the quantum experiment science satellite was achieved in 2017. Here, we introduce the latest achievements in satellite-based quantum communication and large-scale tests of quantum foundations obtained by Micius.

关键词：科学卫星实验科学卫星工程中国科学院优先级测试通讯基础

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Coherence measures based on sandwiched Rényi relative entropy

引用

Chinese Physics B 2020年第1期29卷 113-118页

作者： jianwei Xu College of Science Northwest A&F UniversityYangling 712100China

Coherence is a fundamental ingredient for quantum physics and a key resource for quantum information ***,Cramer and Plenio established a rigorous framework(BCP framework)for quantifying coherence[Baumgratz T,Cramer M and Plenio M B ***.113140401(2014)].In the present paper,under the BCP framework we provide two classes of coherence measures based on the sandwiched Rényi relative *** also prove that we cannot get a new coherence measure f(C(·))by a function f acting on a given coherence measure C.

关键词： quantum coherence coherence measure sandwiched Rényi relative entropy

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

巷道高空作业机构的设计与模态分析

引用

煤矿机械 2025年第1期46卷 26-29页

作者：贾建伟中国煤炭科工集团太原研究院有限公司太原030006 山西天地煤机装备有限公司太原030006 煤矿采掘机械装备国家工程实验室太原030006

介绍了巷道架棚设备所用的高空作业机构的结构及其在使用过程中的受力状态,通过对2种工况的静力学分析得出了高空作业机构最恶劣的受力状态。最后对四级伸缩机械臂做了8阶模态分析,验证了四级伸缩机械臂不会与整机发生共振现象,为整机... 详细信息

介绍了巷道架棚设备所用的高空作业机构的结构及其在使用过程中的受力状态,通过对2种工况的静力学分析得出了高空作业机构最恶劣的受力状态。最后对四级伸缩机械臂做了8阶模态分析,验证了四级伸缩机械臂不会与整机发生共振现象,为整机结构设计提供了部分理论基础。

关键词：高空作业机构四级伸缩臂模态分析巷道架棚机

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear Schrdinger equations on compact Zoll manifolds with odd growth

引用

Science China Mathematics 2015年第5期58卷 1023-1046页

作者： YANG jianwei The Graduate School of China Academy of Engineering Physics

We study nonlinear Schr¨odinger equations on Zoll manifolds with nonlinear growth of the odd *** is proved that local uniform well-posedness are valid in the Hs-subcritical setting according to the scaling invariance, apart from the cubic growth in dimension two. This extends the results by Burq et al.(2005) to higher dimensions with general nonlinearities.

关键词： Schrodinger equations Zoll manifolds Bourgain space

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Synergetic effect of secondary nucleation and growth on the lithium carbonate particle size in the gas-liquid reactive crystallization of LiCl-NH3·H2O-CO2

引用

Particuology 2020年第4期18卷 10-17页

作者： Menghua Tian jianwei Guo Zhi Wang jianwei Cao Xuzhong Gong Key Laboratory of Green Process and Engineering National Engineering Laboratory for Hydrometallurgical Cleaner Production TechnologyInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

In this study,the gas-liquid reactive crystallization of LiCl-NH3·H2O-CO2 was adopted to produce *** weakly alkaline nature of NH3·H2O in the absence of any recarbonation process resulted in a unimodal and easily controllable particle size distribution(PSD)of the obtained *** reaction temperature significantly influenced both the Li2CO3 particle size and *** increasing the temperature from 25 to 60℃,the volume weighted mean particle size increased from 50.5 to 100.5μm,*** Li2CO3 secondary nucleation rate and growth rate were obtained by focused beam reflectance measurements and a laser particle size analyzer,*** secondary nucleation rate of Li2CO3 reduced as a function of temperature,whereas the growth rate *** addition to improving the surface energy of the crystals to enhance the growth process,higher temperatures also reduced the supersolubility of Li2CO3,which also plays a role to decrease the secondary nucleation *** a constant temperature,supersaturation affects the Li2CO3 particle size through the synergistic effect of secondary nucleation and ***,with improved supersaturation,the mean particle size of Li2CO3 *** results provide a meaningful way to evaluate the crystallization process and to regulate the particle size.

关键词： Li2CO3 Gas-liquid reactive crystallization Particle size distribution Supersaturation Secondary nucleation Growth rate

来源：

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

Nickel-catalyzed regioselective B(3,4,5,6)-H tetra-alkylation of o-carboranes

引用

Science China Chemistry 2023年第10期66卷 2836-2841页

作者： jianwei Zhao Zuowei Xie Department of Chemistry and State Key Laboratory of Synthetic Chemistry The Chinese University of Hong KongHong Kong 999077China Shenzhen Grubbs Institute and Department of Chemistry Southern University of Science and TechnologyShenzhen 518055China

Though transition metal-catalyzed cage BH methylation has been well documented, catalytic alkylation of cage BH bonds remained elusive because transition metal alkyl complexes are prone to undergo β-H elimination. We report herein a highly efficient 8-aminoquinoline-assisted nickel-catalyzed regioselective cage B(3,4,5,6)-H tetra-alkylation of o-carboranes employing unactivated alkyl bromides as alkylating agents in the absence of any oxidants, leading to the preparation of a class of tetra-alkylated o-carboranes with a broad substrate scope in good to very high yields. This method opens new avenues for oxidant-free, direct, efficient, sustainable, and regioselective multiple B–H alkylation of carboranes via base metal catalysis.

关键词： nickel catalysis B-H activation carborane alkylation regioselectivity

来源：

维普期刊数据库

同方期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Asymmetric dearomatization enabled by chiral Bronsted acid activation of ynamides

引用

Science China Chemistry 2022年第1期65卷 3-4页

作者： Xingguang Li jianwei Sun Department of Chemistry the Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic ChemistryState Key Laboratory of Chemical EngineeringSchool of Chemistry and Molecular EngineeringEast China University of Science&TechnologyShanghai 200237China

Chiral Bronsted acid catalysis has evolved into a powerful synthetic tool in asymmetric synthesis in the past two decades or ***,despite the broad scope of reactions achieved by chiral Bronsted acid catalysis,they onl... 详细信息

关键词： chiral activation catalysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：