检索结果-南通市图书馆

Composition effect on elastic properties of model NiCo-based superalloys

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第2期29卷 381-389页

作者： Weijie Li chongyu Wang Department of Physics Tsinghua UniversityBeijing 100084China Institute of Applied Physics and Computational Mathematics Beijing 100088China

NiCo-based superalloys exhibit higher strength and creep resistance over conventional *** effects on elastic properties of the γ and γ' phases in newly-developed NiCo-based superalloys were investigated by first-principles calculation combined with special quasi-random *** lattice constant,bulk modulus,and elastic constants vary linearly with the Co concentration in the NiCo *** the selected(Ni,Co)3(Al,W)and(Ni,Co)3(Al,Ti)model γ' phase,the lattice constant,and bulk modulus show a linear trend with alloying element *** addition of Co,Ti,and W can regulate lattice mismatch and increase the bulk modulus,simultaneously.W-addition shows excellent performance in strengthening the elastic properties in the γ' *** become unstable with higher W and Ni contents,e.g.,(Ni0.75Co0.25)3(Al0.25 W0.75),and become brittle with higher W and Co addition,e.g.,Co3(Al0.25 W0.75).Furthermore,Co,Ti,and W can increase the elastic constants on the whole,and such high elastic constants always correspond to a high elastic *** anisotropy index always corresponds to the nature of Young's modulus in a specific direction.

关键词： NiCo-based superalloys elastic constants special quasi-random structures(SQS) directional Young's modulus

Multifunctional Polymer-Protein Conjugates Generated by Multicomponent Reactions

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2021年第8期39卷 2287-2295页

作者： Tengfei Mao chongyu Zhu Lei Tao State Key Laboratory of NBC Protection for Civilian Beijing 102205China The Key Laboratory of Bioorganic Phosphorus Chemistry&Chemical Biology(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing 100084China Department of Materials Science Fudan UniversityShanghai 200433China

Recently,multifunctional polymers for protein conjugation have been facilely synthesized through the multicomponent reactions(MCRs).In this mini-review,current progress in the generation of multifuncti onal polymers with protei n-reactive groups via MCRs is *** mult functional polymers react with model therapeutic proteins,forming multifunctional polymer-protein conjugates,which are prototypes of sophisticated theranostic agents and antibacterial vaccine *** comparison with the traditional multi-step synthesis,the preparation of multifunctional polymers for protein conjugation through MCRs is straightforward and *** to these properties,MCRs have the potential to become a new general strategy to achieve polymer-protein conjugates for biological and medical applications.

关键词： Protein modifications Conjugation Poly(ethylene glycol)(PEG) Multicomponent reactions Polymers

Optical experimental solution for the multiway number partitioning problem and its application to computing power scheduling

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

Science China(Physics,Mechanics & Astronomy) 2023年第9期66卷 15-22页

作者： Jingwei Wen Zhenming Wang Zhiguo Huang Dunbo Cai Bingjie Jia chongyu Cao yin Ma Hai Wei Kai Wen Ling Qian China Mobile(Suzhou)Software Technology Company Limited Suzhou 215163China Beijing QBoson Quantum Technology Co. Ltd.Beijing 100015China

Quantum computing is an emerging technology that is expected to realize an exponential increase in computing power. Recently,its theoretical foundation and application scenarios have been extensively researched and explored. In this work, we propose efficient quantum algorithms suitable for solving computing power scheduling problems in the cloud-rendering domain, which can be viewed mathematically as a generalized form of a typical NP-complete problem, i.e., a multiway number partitioning *** our algorithm, the matching pattern between tasks and computing resources with the shortest completion time or optimal load balancing is encoded into the ground state of the Hamiltonian;it is then solved using the optical coherent Ising machine, a practical quantum computing device with at least 100 qubits. The experimental results show that the proposed quantum scheme can achieve significant acceleration and save 97% of the time required to solve combinatorial optimization problems compared with classical algorithms. This demonstrates the computational advantages of optical quantum devices in solving combinatorial optimization problems. Our algorithmic and experimental work will advance the utilization of quantum computers to solve specific NP problems and will broaden the range of possible applications.

关键词： quantum algorithm coherent Ising machine multiway number partitioning problem

First-principles study of the effects of Si doping on geometric and electronic structure of closed carbon nanotube

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2005年第17期50卷 1823-1828页

作者： ZHOU Junzhe WANG chongyu Department of Physics Tsinghua University Beijing 100084 China International Centre for Materials Physics Chinese Academy of Sciences Shenyang 110016 China

The effects of Si doping on geometric and elec-tronic structure of closed carbon nanotube (CNT) are stud-ied by, a first-principles method, DMol. It is found that the local density of states at the Fermi level (EF) increases due to the Si-doping and the non-occupied states above the EF go down toward the lower energy range under an external elec-tronic field. In addition, due to the doping of Si, a sub-tip on the CNT cap is formed, which consisted of the Si atom and its neighbor C atoms. From these results it is concluded that Si-doping is beneficial to the CNT field emission properties.

关键词：碳纳米管半导体添加剂硅元素电子结构

First-principles investigation of the alloying effect of Ta and Won γ-TiAl

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

Chinese Science Bulletin 2006年第22期51卷 2690-2695页

作者： DANG Hongli WANG chongyu YU Tao Central Iron and Steel Research Institute Beijing 100081 China Department of Physics Tsinghua University Beijing 100084 China International Center for Materials Physics Chinese Academy ofSciences Shenyang 110016 China

7-TiAl 的电子结构上的倔强的元素 Ta 和 W 的 alloying 效果被在密度的框架以内使用第一原则的分离变化方法调查功能的理论。杂质形成精力结果显示 Taand W 能通过替换稳定地呆在 TiAl 系统。Mulliken 人口，状态的密度和费用密度差别... 详细信息

7-TiAl 的电子结构上的倔强的元素 Ta 和 W 的 alloying 效果被在密度的框架以内使用第一原则的分离变化方法调查功能的理论。杂质形成精力结果显示 Taand W 能通过替换稳定地呆在 TiAl 系统。Mulliken 人口，状态的密度和费用密度差别结果证明 Ta 和 W 两个都产生在自己和附近的主人原子之间的强壮的相互作用。gamma-TIAL 上的二个元素的 alloying 效果是一样。

关键词：第一法则电子结构 TiAI 态密度

Hardness, quench sensitivity, and electrical conductivity of 7xxx Al alloys with high Zn concentrations

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2020年第6期63卷 953-959页

作者： PENG yingHao LIU chongyu MA ZongYi JIANG HongJie HUANG HongFeng Key Laboratory of New Processing Technology for Nonferrous Metal&Materials Ministry of EducationGuilin University of TechnologyGuilin 541004China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

In this study,7 xxx(Al-Zn-Mg-Cu)alloys with high Zn concentrations were fabricated by increasing the Zn contents of 7085 Al *** hardness,quench sensitivity,and electrical conductivity of the alloys and a 7085 Al alloy under peak-aged state were *** high Zn concentration alloys had higherη′phase densities and lower quantities of Mg solid atoms than the 7085 Al alloy and thus exhibited higher hardness and electrical *** high Zn concentration alloys also exhibited slightly higher quench sensitivity than 7085 Al alloy,and the depth of the quenching layer of the alloy with 11.27 wt%Zn content reached 100 *** work confirmed that the novel 7 xxx alloy with high Zn concentration showed balanced performance,exhibiting enhanced hardness and conductivity and reasonable quench sensitivity compared with the 7085 commercial Al alloy.

关键词： Al alloy hardness quench sensitivity electrical conductivity

Electronic structure and physical properties of stable and metastable phases in YN: Density-functional theory calculations

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2008年第20期53卷 3131-3137页

作者： GUAN PengFei WANG chongyu YU Tao Central Iron and Steel Research Institute Beijing 100081 China Chinese Center of Advanced Science and Technology (World Laboratory) P.O. Box 8730 Beijing 100080 China Department of Physics Tsinghua University Beijing 100084 China

Local density functional is investigated using the full-potential linearized augmented plane wave (FP-LAPW) method for YN in the hexagonal structure and the rocksalt structure and for hexagonal structures linking a layered hexagonal phase with wurtzite structure along a homogeneous strain transition path. It is found that the wurtzite YN is unstable and the layered hexagonal phase, labeled as ho, in which atoms are approximately fivefold coordinated, is metastable, and the rocksalt ScN is stable. The electronic structure, the physical properties of the intermediate structures and the energy band structure along the transition are presented. It is noticeable that the study of ScN provides an opportunity to apply this kind of material (in wurtzite[h]-derived phase).

关键词：氮化钇稳定相亚稳相相变电子结构密度泛涵理论计算

An Area Optimization Based Cooperative Localization Algorithm with Node Selection

在线全文

学校读者我要写书评

暂无评论

China Communications 2021年第12期18卷 178-195页

作者： Ke Han chongyu Zhang Huashuai Xing Yunfei Xu School of Electronic Engineering Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Information Photonics and Optical Communications(Beijing University of Posts and Telecommunications) Beijing 100876China

In recent years,position information has become a key feature to drive location and context aware services in mobile *** from all over the world have proposed many solu-tions for indoor positioning over the past several ***,due to weak signals,multipath or non-line-of-sight signal propagation,accurately and efficiently localizing targets in harsh indoor environments re-mains a challenging *** improve the perfor-mance in harsh environment with insufficient anchors,cooperative localization has *** this paper,a novel cooperative localization algorithm,named area optimization and node selection based sum-product al-gorithm over a wireless network(AN-SPAWN),is de-scribed and *** alleviate the high compu-tational complexity and build optimized cooperative cluster,a node selection method is designed for the cooperative localization *** experi-ment results indicate that our proposed algorithm has a higher accuracy and is less impacted by NLOS errors than other conventional cooperative localization algo-rithms in the harsh indoor environments.

关键词： cooperative localization node selection PDR indoor localization

Hot deformation behaviour and processing maps of AA6061-10 vol. % SiC composite prepared by spark plasma sintering

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2016年第6期59卷 980-988页

作者： LI XiaoPu LIU chongyu SUN XiaoWei MA MingZhen LIU RiPing State Key Laboratory of Metastable Materials Science and Technology Yanshan University Qinhuangdao 066004 China Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education Guilin University of Technology Guilin 541004 China Hebei Vocational and Technical College of Building Materials Qinhuangdao 066004 China

AA6061-10 vol.% SiC composite was successfully prepared by spark plasma sintering. The deformation behaviour of this composite was studied using the uniaxial compression test, which was conducted at temperatures between 300 and 500℃ and strain rates between 0.001 and 1 s^-1. Results indicate that the stress-strain curves of the AA6061-10 vol.% SiC composite typically feature dynamic recrystallization. The steady stress can be described by a hyperbolic sine constitutive equation, and the activation energy of the composite is 230.88 kJ/mol. The processing map was established according to the dynamic materials model. The optimum hot deformation temperature is 450-500℃ and the strain rate is 1-0.1 s^-1. The instability zones of flow behaviour can also be identified using the processing map.

关键词： AI matrix composite hot deformation processing map stress-strain curves spark plasma sintering