检索结果-南通市图书馆

冷烧结技术的研究进展及其在电工领域的潜在应用

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电工技术学报 2022年第5期37卷 1098-1114页

作者：康晟淋赵学童张洁心郭靖杨丽君输配电装备及系统安全与新技术国家重点实验室(重庆大学) 重庆400044 金属材料强度国家重点实验室(西安交通大学) 西安710049

采用传统烧结方法实现陶瓷材料致密化,通常需要1000℃以上的高温,导致陶瓷材料在物相稳定性、晶界控制及复合烧结等方面受到极大的挑战。最近提出的冷烧结技术可将烧结温度降低至300℃以下,在短时间内,利用过渡液相和单轴压力,通过陶瓷... 详细信息

采用传统烧结方法实现陶瓷材料致密化,通常需要1000℃以上的高温,导致陶瓷材料在物相稳定性、晶界控制及复合烧结等方面受到极大的挑战。最近提出的冷烧结技术可将烧结温度降低至300℃以下,在短时间内,利用过渡液相和单轴压力,通过陶瓷粉体的溶解-再沉淀过程实现陶瓷的致密化。低温、快速烧结等特点使冷烧结技术在陶瓷烧结领域具有诸多优势。该文从冷烧结机理及其在电工领域的潜在应用两个方面对冷烧结技术的研究进展进行了综述,主要介绍了冷烧结陶瓷的致密化过程和制备工艺,并着重分析了过渡液相的分类及其对冷烧结过程的辅助作用。阐述了冷烧结技术在新型电工材料如陶瓷-聚合物基功能材料(压敏、热电、储能电解质)、陶瓷-二维材料(热电)、高电位梯度ZnO压敏陶瓷以及陶瓷-金属多层陶瓷(储能电容器)共烧中的应用,并进一步分析了冷烧结和其他烧结技术结合的可行性。冷烧结技术的提出为陶瓷低温烧结的机理研究、新型陶瓷和陶瓷基复合材料的开发及其在电工领域的应用提供了新的思路和参考。

关键词：冷烧结技术过渡液相复合材料共烧

液相对ZnO陶瓷放电等离子体烧结过程的影响

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2021年第10期50卷 3634-3639页

作者：张洁心康晟淋赵学童孙健杰梁杰陈晗杨丽君廖瑞金重庆大学输配电装备及系统安全与新技术国家重点实验室重庆400044 国网四川电力公司成都供电公司四川成都610000

采用放电等离子体烧结技术制备了ZnO陶瓷,主要研究了液相(醋酸溶液)的添加对烧结过程的影响。结果表明,通过对初始粉料添加约10%的2 mol/L的醋酸溶液,在等离子体烧结过程中,ZnO陶瓷试样在52℃开始收缩,115℃开始致密化,160℃致密度可达... 详细信息

采用放电等离子体烧结技术制备了ZnO陶瓷,主要研究了液相(醋酸溶液)的添加对烧结过程的影响。结果表明,通过对初始粉料添加约10%的2 mol/L的醋酸溶液,在等离子体烧结过程中,ZnO陶瓷试样在52℃开始收缩,115℃开始致密化,160℃致密度可达95%以上,200℃即可完成致密化。在250℃烧结5 min后,晶粒尺寸从初始粉体的200 nm增长到600 nm。X射线衍射结果表明,在液相辅助等离子烧结过程中,ZnO陶瓷中未出现明显杂相,并且晶粒生长表现出沿外施压力垂直的方向取向生长。通过计算发现,液相辅助等离子体烧结ZnO陶瓷其晶粒生长活化能仅为78.8 kJ/mol,约为传统高温烧结的1/3。ZnO陶瓷试样的室温阻抗测试结果表明,晶界阻抗随烧结温度的升高而下降,从120℃烧结试样的9.82×10^(6)Ω下降到250℃烧结试样的2.75×10^(3)Ω。

关键词： ZnO陶瓷等离子体烧结晶界阻抗

Temperature-responsive polymers： Synthesis, properties, and biomedical applications

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第10期11卷 5400-5423页

作者： shenglin Qiao Hao Wang CAS Center for Excellence in Nanoscience CAS Key Laboratory for Biomedical Effects of Nanomatefials and Nanosafety National Center for Nanoscience and Technology (NCNST) Beijing 100190 China University of Chinese Academy of Sciences (UCAS) Beijing 100049 China

Interest in temperature-responsive polymers has steadily grown over the past several decades, and numerous studies have been dedicated to developing temperature sensitive polymers that can be constructed into new smart materials for biomedical applications. Phase behavior of a temperature-responsive polymer plays a pivotal role in determining its biological performance in certain conditions. In addition to the additives （such as salts and proteins） in aqueous solutions, molecular weight, molecular weight distribution, and structural or compositional factors can also significantly affect the transition temperatures of the polymers. This review comprehensively describes well-established and newly developed synthetic strategies for preparing temperature-responsive polymers. The structural and compositional parameters that affect the transition temperatures and self-assembly behavior are discussed. Finally, the biomedical applications of the temperature-responsive polymers in drug delivery, immunotherapy, tissue engineering, and diagnosis are summarized.

关键词： temperature-responsive polymer phase transition self-assembly nanomaterial nanomedicine

On 2-(v,k,λ)Designs with Flag-Transitive Automorphism Groups of Product Action Type

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Algebra Colloquium 2023年第2期30卷 351-360页

作者： Zhilin Zhang shenglin Zhou School of Mathematical Sciences South China Normal University Guangzhou 510640China School of Mathematics South China University of Technology Guangzhou 510640China

In this paper we present two new families of 2-(v,k,λ)designs with a flag-transitive and point-primitive automorphism group of product action *** sur-prisingly,one of them is still a family of 2-(v,k,λ)designs with ... 详细信息

关键词： flag-transitive 2-(v,k,λ) design O'Nan-Scott theorem product action type

Flag-transitive 2-(v,5,λ)designs with sporadic socle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Mathematics in China 2020年第6期15卷 1201-1210页

作者： Jiaxin SHEN shenglin ZHOU School of Mathematics South China University of TechnologyGuangzhou 510640China

We state that the flag-transitive automorphism group of a 2-(v,5,λ)design D is primitive of affine type or almost simple type.W e also find that there are up to isomorphism 202-(v,5,λ)designs admitting flag-transiti... 详细信息

关键词： 2-design primitivity flag-transitivity sporadic simple group

Mixed transition-metal oxides@carbon core-shell nanostructures derived from heterometallic clusters for enhanced lithium storage

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2022年第1期33卷 486-490页

作者： Yanting Chu shenglin Xiong School of Chemistry and Chemical Engineering State Key Laboratory of Crystal MaterialsShandong UniversityJi'nan 250100China

Multicomponent binary metal oxide-involved hybrid structures with unique physicochemical properties have received extensive attention due to their fascinating electrochemical ***,a flexible strategy,which involves the preparation of dual-functional heterometallic Fe_(2)M clusters and their subsequent sintering treatment,is developed to engineer novel 3D hierarchical porous structures assembled with MFe_(2)O_(4)(M=Co,Mn,Ni and Zn)nanoparticles confined within carbon outer shell(denoted as MFe_(2)O_(4)@C HPSs).In this intriguing construction,it can be observed that MFe_(2)O_(4)@C HPSs comprised of carbon coated secondary MFe_(2)O_(4)nanoparticles with an interconnected carbon *** as-prepared MFe_(2)O_(4)@C HPSs possess combined advantages of high capacity of MFe_(2)O_(4)and high conductivity of *** expected,the MFe_(2)O_(4)@C HPSs offer a high reversible capacity,high cycling stability and superior rate *** interconnected conductive carbon shells facilitates fast ion and electron transport and accommodates the mechanical *** addition,nanosized MFe_(2)O_(4)particles,which shorten the ion-transport path and provide extra electroactive sites,also improve the reaction ***,these MFe_(2)O_(4)@C HPSs exhibit good structural integrity during repeated charging and *** research perspective and strategy reported here are highly versatile and shed new light on the synthesis of other advanced electrode for various applications.

关键词： MFe_(2)O_(4) Core-shell nanoparticles Heterometallic clusters Anode Lithium-ion batteries

Polysaccharide from Loquat Leaves to Prepare Hierarchical Porous Carbon as a Matrix for Active Sulfur

在线全文

学校读者我要写书评

暂无评论

Transactions of Nanjing University of Aeronautics and Astronautics 2018年第4期35卷 611-618页

作者： Luo Rui Xiong shenglin Key Laboratory of the Colloid and Interface Chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringShandong University

Fossil fuel exhaustion and overdevelopment usually lead to a recession,which is worsened by the environmental *** it is of high priority to develop high-efficiency energy storage ***,agreen and environment-friendly strategy is devised to fabricate carbon materials from *** water extraction and alcohol precipitation,polysaccharide is extracted from loquat *** calcining under high temperature,hierarchical porous carbon materials(HPCM)are obtained,possessing a variety of macropores,mesopores and *** ample and hierarchical pores enable the electrolyte infiltration and the buffering of the volume expansion of sulfur in repeated electrochemical *** structure stability of the entire electrode can thus be well *** evaluated as the scaffold for sulfur,the electrochemical performance of carbon/sulfur composite was *** after 500 cycles,the reversible capacity is retained as high as 485.4 mA·h/g at the current density of 1.6 A/*** also offers a notable rate capability,attaining the discharge capacity of 700.7 mA·h/g at 2 *** the electrochemical performance results prove the feasibility of the proposed strategy.

关键词： energy storage loquat leaves hierarchical porous carbon materials

A bottleneck-free model for P4P

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2015年第10期58卷 94-108页

作者： LIU Ying ZHANG shenglin LIU HongYing Institute for Network Sciences and Cyberspace Tsinghua University School of Mathematics and Systems Science Beihang University

Provider Portal for Applications(P4P) is a model aiming to incorporate(peer to peer) P2 P applications with Internet Service Providers(ISPs) and improve the performance of the both ISP and the P2 P applications. In this study, we have analyzed the relationship between the link traffic and the P-distance, which is the core interface of P4 P. In addition, the limitation of P4 P in dealing with network applications having bottleneck links is illustrated. Furthermore, taking link utility function as the optimization objective, we propose a Bottleneck-Free model for P4P(BFP), making the traffic produced by P2 P applications more homogeneous,which can reduce the peak link utilization, protect bottleneck links, and thereby improve both the network efficiency and the P2 P performance. We have built a simulation platform based on Bit Torrent and conducted extensive simulations. The simulation results demonstrate that BFP achieves a lower cost for ISPs and a better performance for P2 P applications than P4 P and native P2 P applications, both in intra-domain and inter-domain settings. BFP performs steadily in different topologies and swarm sizes, proving that it is scalable and easy to deploy.

关键词： subgradient method P2P traffic engineering cooperative model duality

On Smash Products of Transitive Module Algebras

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2010年第4期31卷 541-554页

作者： Caihong WANG shenglin ZHU School of Mathematical Sciences Fudan University Shanghai 200433 China School of Mathematics and Information Science Henan Polytechnic University Jiaozuo 454000 Henan China

Let H be a semisimple Hopf algebra over a field of characteristic 0, and A a finite-dimensional transitive H-module algebra with a l-dimensional ideal. It is proved that the smash product A#H is isomorphic to a full matrix algebra over some right coideal subalgebra N of H. The correspondence between A and such N, and the special case A = k（X） of function algebra on a finite set X are considered.

关键词： Semisimple Hopf algebra Smash product Transitive module algebra