检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

基于颗粒流理论的充填体细观参数敏感性分析

金属矿山 2016年第12期45卷 165-169页

作者：程爱平谭春森王为琪聂东青李恩赐武汉科技大学资源与环境工程学院湖北武汉430081

基于颗粒流理论,借助PFC程序建立充填体试样模型,进行单轴压缩数值模拟试验,利用控制变量法分别对充填体试样平行黏结强度、颗粒刚度比、颗粒级配、摩擦系数等细观参数进行敏感性分析,研究以上细观参数对充填体力学特性的影响。研究结... 详细信息

基于颗粒流理论,借助PFC程序建立充填体试样模型,进行单轴压缩数值模拟试验,利用控制变量法分别对充填体试样平行黏结强度、颗粒刚度比、颗粒级配、摩擦系数等细观参数进行敏感性分析,研究以上细观参数对充填体力学特性的影响。研究结果表明:平行黏结强度主要影响充填体强度,对其弹性模量影响较小;颗粒刚度比变大会使颗粒间的刚性接触效应增加,从而削弱平行黏结作用,试验过程中会出现试样产生张拉破坏;摩擦系数对充填体试样强度影响较大,摩擦系数越大,颗粒之间的胶结力越大,试样在发生破坏后残余强度越大;平行黏结强度对充填体单轴抗压强度影响最大。研究成果对充填体抗压强度、弹性模量等宏观参数与细观力学参数的匹配具有指导意义,可为后期细观参数的调试和建模奠定基础。

关键词：充填体颗粒流细观参数敏感性 PFC

Electronics based on two-dimensional materials:Status and outlook

在线全文

学校读者我要写书评

暂无评论

Nano Research 2021年第6期14卷 1752-1767页

作者： Senfeng Zeng Zhaowu tang chunsen Liu Peng Zhou State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai200433China School of Computer Science Fudan UniversityShanghai200433China

Since Moore’s law in the traditional semiconductor industry is facing shocks,More Moore and More than Moore are proposed as two paths to maintain the development of the semiconductor industry by adopting new architectures or new materials,in which the former is committed to the continued scaling of transistors for performance enhancement,and the latter pursues the realization of functional diversification of electronic ***-dimensional(2D)materials are supposed to play an important role in these two *** More Moore,the ultimate thin thickness and the dangling-bond-free surface of 2D channels offer excellent gate electrostatics while avoiding the degradation of carrier mobility at the same time,so that the transistors can be further scaled down for higher *** More than Moore,devices based on 2D materials can well meet the requirements of electronic systems for functional diversity,like that they can operate at high frequency,exhibit excellent sensitivity to the changes in the surroundings at room temperature,have good mechanical flexibility,and so *** this review,we present the application of 2D materials in More Moore and More than Moore domains of electronics,outlining their potential as a technological option for logic electronics,memory electronics,radio-frequency electronics,sensing electronics,and flexible electronics.

关键词： More Moore More Than Moore two-dimensional materials transition metal dichalcogenides(TMDs)

Contact engineering for temperature stability improvement of Bi-contacted MoS2 field effect transistors

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(Information Sciences) 2024年第6期67卷 172-179页

作者： Zizheng LIU Qing ZHANG Xiaohe HUANG chunsen LIU Peng ZHOU State Key Laboratory of Integrated Chip and Systems School of MicroelectronicsZhangjiang Fudan International Innovation CenterFudan University Frontier Institute of Chip and System Shanghai Key Lab for Future Computing Hardware and SystemFudan University Shaoxin Laboratory

Semimetallic bismuth（Bi） is one of the most effective strategies for reducing the contact resistance of two-dimensional transition metal dichalcogenide field effect transistors（FETs）. However, the low melting point of Bi contact（271.5℃） limits its reliable applications. In this study, we demonstrated that the temperature stability of Bi-contacted electrodes could be improved by inserting a high-melting point semimetallic antimony（Sb） between the Bi contacting layer and the gold（Au） capping layer. The proposed Bi/Sb/Au contact electrodes tended to form a metal mixture with a continuous surface during the heating process（Voids appeared on the surface of the Bi/Au contact electrodes after heating at 120℃）. Because of the improved contacting layer formed by the semimetal Bi/Sb alloy, the fabricated Bi/Sb/Au-contacted molybdenum sulfide（MoS2） FETs with different gate lengths demonstrated higher on-state current stability after heating treatment than the Bi/Au contact. Because of the Bi/Sb/Au contact and poly（methyl methacrylate） package, the MoS2FETs demonstrated time stability of at least two months from the almost unchanged transfer characteristics. The electrical stability indicates that the insertion of semimetallic Sb is a promising technology for reliable Bi-based contact.

关键词： temperature stability semimetallic bismuth contact semimetallic antimony contact MoS$_{2}$ FETs time stability

3D Motion Parameters Determination Based on Binocular Sequence Images

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2006年第1期9卷 32-37页

作者： ZHANG Jianqing ZHANG chunsen HE Shaojun School of Remote Sensing and Information Engineering Wuhan University 129 Luoyu Road Wuhan 430079 China

Exactly capturing three dimensional (3D) motion i nf ormation of an object is an essential and important task in computer vision, and is also one of the most difficult problems. In this paper, a binocular vision s ystem and a method for determining 3D motion parameters of an object from binocu lar sequence images are introduced. The main steps include camera calibration, t he matching of motion and stereo images, 3D feature point correspondences and re solving the motion parameters. Finally, the experimental results of acquiring th e motion parameters of the objects with uniform velocity and acceleration in the straight line based on the real binocular sequence images by the mentioned meth od are presented.

关键词： binocular sequence image camera calibration image matching motion parameter

Implementation of an in-house flow cytometric analysis of DNA fragmentation in spermatozoa

在线全文

学校读者我要写书评

暂无评论

Asian Journal of Andrology 2020年第3期22卷 246-251页

作者： Anne Sofie Rex chunsen Wu Jorn Aagaard Jens Fedder Centre of Andrology and Fertility Clinic Odense University HospitalOdense 5000Denmark Aagaard Gynaecological Clinic Skejby 8200AarhusDenmark Research Unit of Gynaecology and Obstetrics Faculty of HealthUniversity of Southern DenmarkOdense 5000Denmark.

An increased amount of DNA fragme ntation in the spermatozoa(SDF)is linked to male in *** Sperm Chromati n Structure Assay(SCSA)is widely used for analysis of ***,the current software(SCSASoftR)linked to this assay is licensed and often located within larger diagnostic *** this study,we present a protocol for using other types of software than SCSASoftR to determine the SDF index(DFI)with clinical *** protocol is engineered after collect!ng and analyzing 254 samples from fertility patients and sperm donors over a 15-month *** is analyzed using a strict protocol where the spermatozoa are treated with a strong acid(pH 1.2)followed by acridine *** is determined by a standard flow cytometric software,FACSDiva *** of the outcome of the fertility treatment is included for 137 patients receiving either intrauterine inseminations(IUI)or timed coitus(TC).The results show that the chance of pregnancy decli nes as DFI in *** also found that the male DFI affects the chanee of pregnancy independent of the female *** have shown that a standard flow cytometric software can be used when determi ning a clinical releva nt *** findings are a sign ificant step toward impleme nting the an alysis as a part of the routi ne,in・house diag no sing of the male fertility patient and subseque ntly optimizing the treatme nt course of the couple with reduced human and financial costs.

关键词： DNA fragme ntation flow cytometry in-house an alysis in trauteri ne in semi natio n Sperm Chromati n Structure Assay spermatozoa

Nanoreactors derived from silica-protection-assisted metal-organic framework

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 Chemical Letters 2020年第9期31卷 2207-2210页

作者： Ling Jin Xiaxia Li chunsen Liu Huan Pang School of Chemistry and Chemical Engineering Guangling CollegeYangzhou UniversityYangzhou 225009China Henan Provincial Key Laboratory of Surface&Interface Science Zhengzhou University of Light IndustryZhengzhou 450002China

The construction of highly stable and regular nanoreactors is a major *** this work,we use a facile template protection method to obtain ZIF-67@SiO2(JS) and to encapsulate metal oxide nanoparticles(Co3O4) into nanoreactors(SiO2).ZIF-67 crystals provide a cobalt species;SiO2 was first used as a protective layer of ZIF-67 and then as a nanoreactor for metastable metal oxide *** this basis,Co3O4@SiO2 with dodecahedron morphology were synthesized by calcining JS at different tempe ratures,followed by a hydrothermal reaction to obtain Co3(OH)***,CoSx and CoP-SiO2 were fabricated through sulfuration and *** results in this work show that nanoreactors derived from metal-organic frameworks(MOFs) with a rational structure have broad development prospects.

关键词： Core-shell structure Metal oxide nanoparticles Co3(OH)4Si2O5 Nanoreactors Silicon shell

Association schemes of quadratic forms over a finite field of characteristic two

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第23期43卷 1965-1968页

作者： Yangxian Wang chunsen Wang Changli Ma Hebei Teachers Univ Dept Math Shijiazhuang 050091 Peoples R China

For the association schemes of quadratic forms over a finite field of characteristic two, the parameters of this association scheme are discussed by using matrix skill. For n=2, 3 , all the parameters are computed. For n≥3 , the formulas of parameters P * 2 -2j+1 and related recursion formulas of the general parameters P * ** are obtained.

关键词： finite field quadratic form association scheme.

Optimization of horizontal well staggered patterns

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2008年第4期5卷 348-352页

作者： Zhao chunsen Li Peijing Guan Dan Liu Qingjuan Department of Petroleum Engineering Daqing Petroleum Institute Daqing Heilongjiang 163318 China

Staggered line-drive patterns are widely used in oilfields. In this paper, to optimize a staggered pattern of horizontal wells, a 3D problem was divided into two 2D （x-y plane andy-z plane） problems with the pseudo-3D method, conformal transformation and superposition principle. A productivity equation for a horizontal well was deduced, which can be used to optimize the well pattern. A relationship between the length of horizontal wells and the shape factor of well patterns was established. The result shows that optimized well patterns can improve oil production from horizontal wells. This provides a theoretical basis for horizontal well applications to the development of oilfields, especially for overall development of oilfields by horizontal wells.

关键词： Horizontal well productivity calculation optimization of well pattern

In-memory computing to break the memory wall

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第7期29卷 28-48页

作者： Xiaohe Huang chunsen Liu Yu-Gang Jiang Peng Zhou State Key Laboratory of ASIC and System School of MicroelectronicsFudan UniversityShanghai 200433China School of Computer Science Fudan UniversityShanghai 200433China

Facing the computing demands of Internet of things(IoT)and artificial intelligence(AI),the cost induced by moving the data between the central processing unit(CPU)and memory is the key problem and a chip featured with flexible structural unit,ultra-low power consumption,and huge parallelism will be ***-memory computing,a non-von Neumann architecture fusing memory units and computing units,can eliminate the data transfer time and energy consumption while performing massive parallel *** in-memory computing schemes modified from different memory technologies have shown orders of magnitude improvement in computing efficiency,making it be regarded as the ultimate computing *** we review the state-of-the-art memory device technologies potential for in-memory computing,summarize their versatile applications in neural network,stochastic generation,and hybrid precision digital computing,with promising solutions for unprecedented computing tasks,and also discuss the challenges of stability and integration for general in-memory computing.

关键词： in-memory computing non-volatile memory device technologies crossbar array