检索结果-南通市图书馆

Origin of enhanced electrochemical performance in lithium-rich cathode materials via the fast ion conductor Li_(2)O-B_(2)O_(3)-LiBr

引用

Particuology 2024年第11期94卷 245-251页

作者： Yang you Hanhui Liu Mingliang Yuan School of Mineral Processing and Bioengineering Central South UniversityChangsha410083China

Lithium-rich cathode materials have garnered significant attention in the energy sector due to their high specific ***,severe capacity degradation impedes their large-scale *** employment of fast ion conductors for coating has shown potential in improving their electrochemical performance,yet the structural and chemical mechanisms underlying this improvement remain *** this study,we systematically analyze,through first-principles calculations,the mechanism by which Li_(2)O-B_(2)O_(3)-LiBr(Hereafter referred to as LBB)coating enhances the electrochemical performance of the lithium-rich layered cathode material 0.5Li2MnO3·0.5LiNi1/3Co1/3Mn1/3O2(Hereafter referred to as OLO).Our calculations reveal that the LBB coating introduces a more negative valence charge(average−0.14 e)around the oxygen atoms surrounding transition metals,thereby strengthening metal-oxygen *** interaction mitigates irreversible oxygen oxidation caused by anionic redox reactions under high voltages,reducing irreversible structural changes during battery ***,while the migration barrier for Li+in OLO is 0.61 eV,the LBB coating acts as a rapid conduit during the Li+deintercalation process,reducing the migration barrier to 0.32 eV and slightly lowering the internal migration barrier within OLO to 0.43 *** of binding energies to electrolyte byproducts HF before and after coating(at−7.421 and−3.253 eV,respectively)demonstrate that the LBB coating effectively resists HF *** electrochemical performance studies corroborated these *** OLO cathode with a 2%LBB coating exhibited a discharge capacity of 157.12 mAh g^(−1) after 100 cycles,with a capacity retention rate of 80.38%,whereas the uncoated OLO displayed only 141.67 mAh g^(−1) and a 72.45%capacity *** a 2 C rate,with the 2 wt%LBB-coated sample maintaining a discharge capacity of 140.22 mAh g^(−1) compared to only 107.02 mAh g^(−1) for the unco

关键词： First-principles calculations Li_(2)O-B_(2)O_(3)-LiBr coating Fast ion conductor Lithium-rich cathode materials

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

Schemes for Probabilistic Teleportation of an Unknown Three-Particle Three-Level Entangled state

引用

Communications in Theoretical Physics 2006年第2期45卷 275-278页

作者： ZHAN you-Bang Department of Physics Huaiyin Teachers College Huaian 223001 China

In this paper, two schemes for teleporting an unknown three-particle three-level entangled state are proposed. In the first scheme, two partial three-particle three-level entangled states are used as the quantum channels, while in the second scheme, three two-particle three-level non-maximally entangled states are employed as quantum channels. It is shown that the teleportation can be successfully realized with certain probability, for both two schemes, ira receiver adopts some appropriate unitary transformations. It is shown also that the successful probabilities of these two schemes are different.

关键词： probabilistic teleportation three-particle three-level entangled state unitary transformation

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

A new 3D plastoelastohydrodynamic lubrication model for rough surfaces

引用

Friction 2024年第6期12卷 1176-1193页

作者： Shengyu you Jinyuan TANG Qiang WANG State Key Laboratory of Precision Manufacturing for Extreme Service Performance Central South UniversityChangsha 410083China

Plastoelastohydrodynamic lubrication of rough surfaces(R-PEHL)is a cutting-edge area of research in interface fluid-structure coupling *** existing R-PEHL model calculates the elastic-plastic deformation of rough surface by the Love equation in a semi-infinite space smooth surface,which deviates from the actual ***,it is an innovative work to study the exact solution of elastic-plastic deformation of rough surface and its influence on the solution results of R-PEHL *** this paper,a new contact calculation model of plastoelastohydrodynamic lubrication(PEHL)with three-dimensional(3D)rough surface is proposed by integrating numerical method of EHL and finite element *** new model eliminates an original error introduced by the assumption of semi-infinite space in contact calculation,providing wide applicability and high *** the given rough surfaces and working conditions,the study reveals that:(1)the oil film pressure calculated by the new model is lower than that of the smooth surface in semi-infinite space by 200–800 MPa;(2)the Mises stress of the new model is 2.5%–26.6%higher than that of the smooth surface in semi-infinite space;(3)compared with the semi-infinite space assumption,the rough surface plastic deformation of the new model is increased by 71%–173%,and the local plastic deformation singularity may appear under the semi-infinite space assumption;(4)the plastic deformation caused by the first contact cycle on the rough surface of the new model accounts for 66.7%–92.9%of the total plastic deformation,and the plastic deformation of the semi-infinite space accounts for 50%–83.3%.This study resolves the contradiction between the smooth surface assumption and the rough surface in the existing R-PEHL model,establishing a solid logic foundation for the accurate solution of R-PEHL model.

关键词： rough surface plastoelastohydrodynamic lubrication(PEHL) asperity plastic deformation semi-infinite space

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

Jackknife Model Averaging for Composite Quantile Regression

引用

Journal of Systems Science & Complexity 2024年第4期37卷 1604-1637页

作者： you Kang WANG Miaomiao ZOU Guohua School of Mathematical Sciences Capital Normal UniversityBeijing 100089China School of Chinese Materia Medica Beijing University of Chinese MedicineBeijing 100105China

In this paper,the authors propose a frequentist model averaging method for composite quantile regression with diverging number of *** from the traditional model averaging for quantile regression which considers only a single quantile,the proposed model averaging estimator is based on multiple *** well-known delete-one cross-validation or jackknife approach is applied to estimate the model *** resultant jackknife model averaging estimator is shown to be asymptotically optimal in terms of minimizing the out-of-sample composite final prediction *** studies are conducted to demonstrate the finite sample performance of the new model averaging *** proposed method is also applied to the analysis of the stock returns data and the wage data.

关键词： Asymptotic optimality composite quantile regression cross-validation model averaging

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

Coordinated multicast and unicast transmission in V2V underlay massive MIMO

引用

Science China(Information Sciences) 2022年第3期65卷 235-245页

作者： Xinxin NIU Li you Xiqi GAO National Mobile Communications Research Laboratory Southeast University Purple Mountain Laboratories

This paper investigates coordinated multicast and unicast transmission for vehicle-to-vehicle(V2 V) underlay massive multiple-input multiple-output(MIMO). First, the achievable ergodic multicast rate for the cellular link and the achievable ergodic unicast rate for all the V2 V links are summed with weight to formulate the rate optimization problem, with the assumption that the statistical channel state information(CSI) is known at the base station and the transmitters of the V2 V communication pairs. We then derive the optimal transmitting directions in closed-form for the cellular link and all the V2 V links,respectively, which converts the original optimal problem to a simpler power allocation problem in the beam domain. Via invoking the concave-convex procedure, an efficient iterative algorithm with guaranteed convergence is proposed for the power allocation problem. Furthermore, we replace the objectives which contain high-complex expectation operations with their deterministic equivalents in each iteration of the proposed algorithm to achieve lower algorithm complexity. Simulation results show the fast convergence speed of the proposed power allocation algorithm and the significant performance gains of the proposed transmission design for V2 V underlay massive MIMO.

关键词： coordinated multicast and unicast transmission V2V underlay massive MIMO statistical CSI

来源：

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

Nonlinear Standing Waves in a Tube

引用

Chinese Physics Letters 1993年第6期10卷 343-346页

作者： MAA Dah-you Institute of Acoustics Academia SinicaBeijing 100080

Theory of lossless nonlinear standing waves in tubes is extended to the case when dissipation exists due to the boundary layer inside the *** the viscous loss is taken care of with a complex wave *** solutions thus obtained for the nonlinear standing wave satisfy exactly the hydrodynamic *** unusual situations encountered in developing the formulae of the field parameters into their frequency components are discussed and solutions proposed.

关键词： nonlinear satisfy standing

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

Superconducting X-ray detectors

引用

Science China(Information Sciences) 2020年第8期63卷 91-109页

作者： Can YANG Mengting SI Lixing you State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology (SIMIT)Chinese Academy of Sciences CAS Center for Excellence in Superconducting Electronics (CENSE) Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Zhejiang Photon Technology Co.Ltd. Guigu Science Park

Owing to their high sensitivity and low noise, superconducting detectors are used for photon detection from microwave to high-energy particles. X-ray detection plays an important role in materials analysis, astronomy, and medical radiography, which require high efficiency as well as high energy resolution. However, traditional semiconducting detectors cannot fulfill these requirements. In this article, we review superconducting quantum detectors for X-ray detection, including transition-edge sensor(TES), superconducting tunneling junctions(STJs), kinetic inductance detectors(KIDs) and superconducting nanowire single-photon detectors(SNSPDs), and introduce the physical structures, working mechanisms, and device behaviors of these detectors. We also review their performances regarding X-ray detection and analyze their respective characteristics. According to recent progress and the requirements of various applications, possible improvement of superconducting detectors for X-rays are discussed.

关键词： superconducting X-ray detectors transition-edge sensors superconducting tunneling junctions kinetic inductance detectors superconducting nanowire single-photon detector

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

Computation of Minimal Siphons in Petri Nets Using Problem Partitioning Approaches

引用

IEEE/CAA Journal of Automatica Sinica 2022年第2期9卷 329-338页

作者： Dan you Oussama Karoui Shouguang Wang IEEE School of Information and Electronic Engineering(Sussex Artificial Intelligence Institute) Zhejiang Gongshang UniversityHangzhou 310018China

A large amount of research has shown the vitality of siphon enumeration in the analysis and control of deadlocks in various resource-allocation systems modeled by Petri nets(PNs).In this paper,we propose an algorithm for the enumeration of minimal siphons in PN based on problem *** proposed algorithm is an improved version of the global partitioning minimal-siphon enumeration(GPMSE)proposed by Cordone et al.(2005)in IEEE Transactions on Systems,Man,and Cybernetics-Part A:Systems and Humans,which is widely used in the literature to compute minimal *** experimental results show that the proposed algorithm consumes lower computational time and memory compared with GPMSE,which becomes more evident when the size of the handled net grows.

关键词： Index Terms-Petri nets(PNs) problem decomposition resource-allocation systems siphons

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

Effect of pitched short blades on the flow characteristics in a stirred tank with long-short blades impeller

引用

Chinese Journal of Chemical Engineering 2022年第5期35卷 143-152页

作者： Yongjun Wu Pan you Peicheng Luo School of Chemistry and Chemical Engineering Southeast UniversityNanjing 211189China

This work focuses on the design improvement of the long-short blades(LSB)impeller by using pitched short blades(SBs)to regulate the flow field in the stirred *** mesh size evaluation and velocity field validation by the particle image velocimetry,large eddy simulation method coupled with sliding mesh approach was used to study the effect of the pitched SBs on the flow *** changed the inclined angles of the SBs from 30°to 60°and compared the flow characteristics when the impeller was operated in the down-pumping and up-pumping *** the case of down-pumping mode,the power number is relatively smaller and vortexes below the SBs are suppressed,leading to turbulence intensification in the bottom of the *** in the case of up-pumping mode,the axial flow rate in the center increased significantly with bigger power number,resulting in more efficient mass exchange between the axial and radial flows in the whole *** LSB with 45°inclined angle of the SBs in the up-pumping mode has the most uniform distributions of flow field and turbulent kinetic energy compared with other impeller configurations.

关键词： Stirred tank Computational fluid dynamics(CFD) Turbulent flow Long-short blades(LSB)impeller Pitched blades

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

PD-like finite time controller with simple structure for satellite attitude control

引用

Defence Technology（防务技术） 2023年第8期26卷 123-133页

作者： Li you Ye Dong Xiao Bing Xidian University Xi'an710126China Harbin Institute of Technology Harbin 150090China Northwestern Polytechnical University Xi'an710072China

A finite time controller with PD-like structure for satellite attitude control is proposed in this *** controller is constructed with simple structure based on standard PD *** fractional order term is designed hence system could both have strong robustness and finite time convergence rate,and the advantage of finite time control and PD control is combined in this *** convergence rate is discussed by Lyapunov method,and the constraint on control parameters is given by implementing the coupled term of angular velocity and attitude ***,the accuracy at steady stage depending on control parameters is given hence system could converge to this field within finite *** stability and performance is demonstrated by numerical simulation results.

关键词： Finite time control PD-like Simple structure Attitude control

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：