检索结果-南通市图书馆

Thermoelectric effect of silicon films prepared by aluminum-induced crystallization

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2012年第10期19卷 957-963页

作者： qing-run Hou Bing-fu gu Yi-bao Chen Yuan-jin He Department of Physics Tsinghua UniversityBeijing 100084China

Aluminum-induced crystallized silicon films were prepared on glass substrates by magnetron sputtering. Aluminum was added in the silicon films intermittently by the regular pulse sputtering of an aluminum target. The amount of aluminum in the silicon films can be controlled by regulating the aluminum sputtering power and the sputtering time of the undoped silicon layer; thus, the Seebeck coefficient and electrical resistivity of the polyerystaUine silicon films can be adjusted. It is found that, when the sputtering power ratio of aluminum to silicon is 16%, both the Seebeck coefficient and the electrical resistivity decrease with the increasing amount of aluminum as expected; the Seebeck coefficient and the electrical resistivity at room temperature are 0.185-0.285 mV/K and 0.30-2.4 Ω.cm, respectively. By reducing the sputtering power ratio to 7%, however, the Seebeck coefficient does not change much, though the electrical resistivity still decreases with the amount of aluminum increasing; the Seebeck coefficient and electrical resistivity at room temperature are 0.219-0.263 mV/K and 0.26-0.80 Ω·cm, respectively.

关键词： polycrystalline materials thin films silicon thermoelectric effects Seebeck effect electrical resistivity magnetron sputtering

BIVARIATE LAGRANGE-TYPE VECTOR VALUED RATIONAL INTERPOLANTS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2002年第2期20卷 207-216页

作者： Chuan-qing gu Gong-qing Zhu Department of Mathematics Shanghai UniversityShanghai 200436China Department of Mathematics Hefei Polytechnic UniversityHefei 230009China

Focuses on a study that presented an axiomatic definition to bivariate vector valued rational interpolation on distinct plane interpolation points. Definition; Existence and uniqueness; Connection.

关键词： bivariate vector value rational interpolation determinantal formula

Transition-layer of coreerim structures andβ→a transformation in SiC ceramics

在线全文

学校读者我要写书评

暂无评论

Journal of Materiomics 2023年第2期9卷 299-309页

作者： qing-qing Shao Hui gu Materials Genome Institute School of Materials Science and EngineeringShanghai UniversityShanghai200444China

Similar to Si_(3)N_(4)ceramics,β→a phase transformation in SiC ceramics plays a key role in tailoring the microstructures thus optimizing related *** microstructures are dominated with the core erim structures by AlN-solution,and by EBSD analysis,a-lamellae were revealed as stacking-faults(SF)and twin-boundaries(TB)in b-grains,co-existing with the coreerim structures asα/β→α’/β’transformation by *** structural transformation can proceed much further by gas-pressuresintering than hot-pressing with only RE2O3 agents,while the latter retain a high-density of SF/TB in the metastable b-SiC *** high-angle secondary-electron imaging,nanoscale transition-layer(TL)was observed as an inter-phase to fully separate the core and rim,which is created by a transitory equilibrium in the solutionereprecipitation *** enrichment of AlN or RE in TL demonstrates their segregation to core surface until reaching the super-saturation and before the growth of *** higher AlN or RE solution and after sintering,a shear stress can develop from TL contour to drive the expansion of SF/TB in Martensitic transition,especially under an external isotropic *** combinations ofβ→a transformation,coreerim structures and viscous liquid-phase enable the comprehensive assessment of sintering-microstructure-property-performance relationship of SiC ceramics,as demonstrated for their creep behaviors and fracture toughness.

关键词： SiC ceramics Coreerim structures Transition-layer Martensitic transition Creep behaviors

Effect of pH values on the extracellular polysaccharide secreted by Acidithiobacillus ferrooxidans during chalcopyrite bioleaching

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

International Journal of Minerals,Metallurgy and Materials 2014年第4期21卷 311-316页

作者： run-lan Yu Jing Liu Jian-xi Tan Wei-min Zeng Li-juan Shi guo-hua gu Wen-qing Qin guan-zhou Qiu School of Minerals Processing and Bioengineering Central South University Key Laboratory of Biometallurgy Ministry of Education Hunan Entry-Exit Inspection and Quarantine Bureau

The pH value plays an important role in the bioleaching of sulphide minerals. The effect of pH values on the extracellular poly-saccharide secreted by Acidithiobacillus ferrooxidans was investigated in different phases of bacterial growth during chalcopyrite bioleach-ing. It is found that extracellular polysaccharide secretion from the cells attached to chalcopyrite is more efficiently than that of the free cells in the bioleaching solution. Three factors, pH values, the concentration of soluble metal ions, and the bacterial growth and metabolism, affect extracellular polysaccharide secretion in the free cells, and are related to the bacterial growth phase. Extracellular polysaccharide secretion from the attached cells is mainly dependent on the pH value of the bacterial culture.

关键词： chalcopyrite bioleaching polysaccharides acidity Acidithiobacillusferrooxidans

Review of Some Advances and Applications in Real-time High-speed Vision: Our Views and Experiences

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2016年第4期13卷 305-318页

作者： qing-Yi gu Idaku Ishii Robotics Laboratory Graduate School of Engineering Hiroshima University Higashi-Hiroshima Hiroshima 738-8527 Japan

The frame rate of conventional vision systems is restricted to the video signal formats （e.g., NTSC 30 fps and PAL 25 fps） that are designed on the basis of the characteristics of the human eye, which implies that the processing speed of these systems is limited to the recognition speed of the human eye. However, there is a strong demand for real-time high-speed vision sensors in many application fields, such as factory automation, biomedicine, and robotics, where high-speed operations are carried out. These high-speed operations can be tracked and inspected by using high-speed vision systems with intelligent sensors that work at hundreds of Hertz or more, especially when the operation is difficult to observe with the human eye. This paper reviews advances in developing real-time high Speed vision systems and their applications in various fields, such as intelligent logging systems, vibration dynamics sensing, vision-based mechanical control, three-dimensional measurement/automated visual inspection, vision-based human interface, and biomedical applications.

关键词： Real-time high-speed vision target tracking abnormal behavior detection behavior mining vibration analysis 3D shapemeasurement cell sorting.

Trinuclear gold-catalyzed site-selective alkylation of peptides

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期 249-256页

作者： qing-Yun Fang Chengyihan gu Yinghan Chen Wencheng Yan Yong Liang Weipeng Li Chengjian Zhu Jie Han Jin Xie State Key Laboratory of Coordination Chemistry Jiangsu Key Laboratory of Advanced Organic Materials Chemistry and Biomedicine Innovation Center (Chem BIC) School of Chemistry and Chemical Engineering Nanjing University Green Catalysis Center College of Chemistry Zhengzhou University State Key Laboratory of Natural Medicines China Pharmaceutical University

Selective modification of peptides has always been a challenging issue. The selective alkylation of peptides can alter the biological activity and physical properties of molecules, and it has gained significant research interest. We herein disclose an intriguing gold-catalyzed alkylation of peptides using bench-stable unactivated alkyl bromides under photoredox catalysis. A wide range of structurally diverse primary, secondary and tertiary alkyl bromides serve as effective coupling partners to precisely connect with the α-C(sp3)–H in glycine residue of peptides. This protocol demonstrates an exceptionally broad scope for alkyl halides and excellent tolerance for a wide range of useful functional groups. A series of relay transformations to construct cyclic peptides, to proceed click reaction and to realize peptide fluorescence labeling further enhance its synthetic practicality. In addition, mechanistic studies and density functional theory(DFT) calculations reveal an inner-sphere and subsequent outersphere single electron transfer(SET) mechanism.

关键词：

同方期刊数据库

Bond-associated non-ordinary state-based peridynamic model for multiple spalling simulation of concrete

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2021年第7期37卷 1104-1135,I0002页

作者： Siyang Yang Xin gu qing Zhang Xiaozhou Xia Department of Engineering Mechanics College of Mechanics and MaterialsHohai UniversityNanjing 211100China

The non-ordinary state-based peridynamic(NOSB PD)model has the capability of incorporating existing constitutive relationships in the classical continuum *** the present work,we first develop an NOSB PD model corresponding to the Johnson–Holmquist II(JH-2)constitutive damage model,which can describe the severe damage of concrete under intense impact ***,the numerical oscillation problem of the NOSB PD caused by zero-energy mode is analyzed and hence a bond-associated non-ordinary state-based peridynamic(BA-NOSB PD)model is adopted to remove the ***,the elastic deformation of a three-dimensional bar is analyzed to verify the capability of BA-NOSB PD in eliminating the numerical ***,concrete spalling caused by the interaction of incident compression wave and reflected tension wave is *** dynamic tensile fracture process of concrete multiple spalling is accurately reproduced for several examples according to the spalling number and spalling thickness analysis,illustrating the approach can well simulate and analyze the concrete spalling discontinuities.

关键词： Non-ordinary state-based peridynamics Bond-associated horizon-Johnson-HolmquistⅡ(JH-2)model Wave propagation Multiple spalling

Correlations between characteristics of maximum influence and degree distributions in software networks

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) 2014年第7期57卷 25-36页

作者： gu qing XIONG ShiJie CHEN DaoXu National Key Lab of Novel Software Technology and Department of Computer Science and Technology Nanjing University National Laboratory of Solid State Microstructures and Department of Physics Nanjing University

Software systems can be represented as complex networks and their artificial nature can be investigated with approaches developed in network *** maximization has been successfully applied on software networks to identify the important nodes that have the maximum influence on the other ***,research is open to study the effects of network fabric on the influence behavior of the highly influential *** this paper,we construct class dependence graph(CDG)networks based on eight practical Java software systems,and apply the procedure of influence maximization to study empirically the correlations between the characteristics of maximum influence and the degree distributions in the software *** demonstrate that the artificial nature of CDG networks is reflected partly from the scale free behavior:the in-degree distribution follows power law,and the out-degree distribution is *** the influence behavior,the expected influence spread of the maximum influence set identified by the greedy method correlates significantly with the degree *** addition,the identified influence set contains influential classes that are complex in both the number of methods and the lines of code(LOC).For the applications in software engineering,the results provide possibilities of new approaches in designing optimization procedures of software systems.

关键词： software network scale free influence maximization power law complex network

Energy Saving for Automatic Train Control in Moving Block Signaling System

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

China Communications 2014年第A2期11卷 12-22页

作者： gu qing MENG Yu MA Fei School of Mechanical Engineering University of Science and Technology Beijing Beijing 100083 E R. China

With rapid development of the railway traffic, the moving block signaling system （MBS） method has become more and more important for increasing the track capacity by allowing trains to run in a shorter time-headway while maintaining the required safety margins. In this framework, the tracking target point of the following train is moving forward with its leading train. This paper focuses on the energy saving tracking control of two successive trains in MBS. Nonlinear programming method is used to optimize the energy-saving speed trajectory of the following train. The real-time location of the leading train could be integrated into the optimization process. Due to simplicity, it can be used for online implementation. The feasibility and effectiveness are verified through simulation. The results show that the new method is efficient on energy saving even when disturbances present.

关键词： moving block signaling (MBS) energy saving automatic train protection (ATP) automatic train operation (ATO) tracking train speed trajectory