检索结果-南通市图书馆

Preparation of grain size controlled boron-doped diamond thin films and their applications in selective detection of glucose in basic solutions

引用

Science china Chemistry 2010年第6期53卷 1378-1384页

作者： ZHAO JianWen1,2.WANG JinLiang3,ZHI JinFang3 & ZHANG ZhiMing4 1College of Chemistry and Chemical engineering,Jishou university,Jishou 416000,{2. 2.chools of Materials Science and engineering,Nanyang Technological university,639798,Singapore 3Laboratory of Organic Optoelectronic Functional Materials and Molecular engineering,Technical institute of Physics and Chemistry & Graduate university of Chinese Academy of Sciences,Beijing 100080,{2. 4Research institute of Micro-Nano Science and Technology,Shanghai jiao tong university,Shanghai 2.0030,{2. 1. College of Chemistry and Chemical engineering Jishou University Jishou 416000 China2. Schools of Materials Science and Engineering Nanyang Technological University 639798 Singapore Singapore3. Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering Technical Institute of Physics and Chemistry & Graduate University of Chinese Academy of Sciences Beijing 100080 China4. Research Institute of Micro-Nano Science and Technology Shanghai Jiao Tong University Shanghai 200030 China

Boron-doped diamond (BDD) thin films with different crystal grain sizes were prepared by controlling the reacting gas pressure using hot filament chemical vapor deposition (HFCVD).The morphologies and structures of the prepared diamond thin films were characterized by scanning electron microscopy (SEM) and Raman *** electrochemical responses of K4Fe(CN)6 on different BDD electrodes were *** results suggested that electron transfer was faster at the boron-doped nanocrystalline diamond (BDND) thin film electrodes in comparison with that at other BDD thin film *** prepared BDD thin film electrodes without any modification were used to directly detect glucose in the basic *** results showed that the as-prepared BDD thin film electrodes exhibited good selectivity for detecting glucose in the presence of ascorbic acid (AA) and uric acid (UA).The higher sensitivity was observed on the BDND thin film grown on the boron-doped microcrystalline diamond (BDMD) thin film surface,and the linear response range,sensitivity and the low detection limit were 0.2.–10 mM,189.1 μA mmol-1 cm-2.and 2. μM (S/N=3) for glucose in the presence of AA and UA,respectively.

关键词： diamond thin films electrochemical properties selective glucose detection

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

Lie Point Symmetries of Differential-Difference Equations

引用

Communications in Theoretical Physics 2004年第5期41卷 645-648页

作者： DING Wei~1 TANG Xiao-Yan~(2.3) 1 Department of Applied Mathematics,Shanghai jiao tong {2.,Shanghai 2.0030,china2.Department of Physics,Shanghai jiao tong {2.,Shanghai 2.0030,china3 State Key Laboratory of Scientific and engineering Computing,institute of Computational Mathematics and Scientific engineering Computing,Academy of Mathematics and System Sciences,the Chinese Academy of Sciences,P.O.Box 2.19,Beijing 100080,china State Key Laboratory of Scientific and engineering Computing Institute of Computational Mathematics and Scientific Engineering Computing Academy of Mathematics and System Sciences the Chinese Academy of Sciences P.O. Box 2719 Beijing 100080 China

In this paper,the classical Lie group approach is extended to find some Lie point symmetries of differential-difference *** reveals that the obtained Lie point symmetries can constitute a Kac-Moody-Virasoro algebra.

关键词： Lie point symmetry differential-difference equation Kac Moody-Virasoro algebra

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

Experimental Study of Motion of Nitrogen Taylor Bubbles and Liquid Slugs in Inclined Tubes

引用

Chinese Journal of Aeronautics 2009年第4期22卷 349-354页

作者： Zhang Hua,Wang Shuhua,Wang Jing institute of engineering Thermo-physics,Shanghai {2. tong university,Shanghai 2.02.0,china [a]institute of engineering Thermo-physics Shanghai Jiao Tong University Shanghai 200240 China

This article studies rising velocity of Taylor bubbles and liquid slugs in liquid nitrogen at different axial positions in upward inclined tubes by means of a high speed motion analyzer. The bottom-closed tubes in the experiments are 1.0 m long with an inner diameter of 0.014 m or 0.018 m. The tube inclines upward from 0~ to 50~ with respect to the normal. Statistical method is used to analyze the data of the Taylor bubble and the liquid slug velocity. Reflecting the effects of the inclination angle on the rising velocity of Taylor bubbles and liquid slugs, the experimental results indicate the similar trend the Taylor bubble velocity and the liquid slug velocity have： it increases first, and then decreases with the increase of the inclination angle. Moreover, with the increase of the inclination angle, the liquid slug velocity becomes greater than Taylor bubble velocity.

关键词： cryogenic two-phase flow rising velocity high speed motion analyzer liquid nitrogen Taylor bubble liquid slug inclined tube

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

Global optimization of tool path for five-axis flank milling with a cylindrical cutter

引用

Science china(Technological Sciences) 2009年第8期52卷 2449-2459页

作者： DING Han1 & ZHU LiMin2.1 State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong university of Science and Technology, Wuhan 430074, china 2.School of Mechanical {2., Shanghai jiao tong university, Shanghai 2.02.0, china State Key Laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China School of Mechanical engineering Shanghai Jiao Tong University Shanghai 200240 China

In this paper, optimum positioning of cylindrical cutter for five-axis flank milling of non-developable ruled surface is addressed from the perspective of surface approximation. Based on the developed interchangeability principle, global optimization of the five-axis tool path is modeled as approximation of the tool envelope surface to the data points on the design surface following the minimum zone criterion recommended by ANSI and ISO standards for tolerance evaluation. By using the signed point-to-surface distance function, tool path plannings for semi-finish and finish millings are formulated as two constrained optimization problems in a unified framework. Based on the second order Taylor approximation of the distance function, a sequential approximation algorithm along with a hierarchical algorithmic structure is developed for the optimization. Numerical examples are presented to confirm the validity of the proposed approach.

关键词： five-axis flank milling tool path optimization tool axis trajectory surface surface approximation distance function minimax optimization

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

Computational model for perception of objects and motions

引用

Science china(Life Sciences) 2008年第6期51卷 526-536页

作者： YANG WenLu1,2. ZHANG LiQing1 & MA LiBo1 1 Department of Computer Science and engineering, Shanghai jiao {2. university, Shanghai 2.02.0, china 2.Department of Electronic engineering, Shanghai Maritime university, Shanghai 2.0135, china 1. Department of Computer Science and engineering Shanghai Jiao Tong University Shanghai 200240 China 2. Department of Electronic engineering Shanghai Maritime University Shanghai 200135 China

Perception of objects and motions in the visual scene is one of the basic problems in the visual system. There exist 'What' and 'Where' pathways in the superior visual cortex, starting from the simple cells in the primary visual cortex. The former is able to perceive objects such as forms, color, and texture, and the latter perceives 'where', for example, velocity and direction of spatial movement of objects. This paper explores brain-like computational architectures of visual information processing. We propose a visual perceptual model and computational mechanism for training the perceptual model. The compu- tational model is a three-layer network. The first layer is the input layer which is used to receive the stimuli from natural environments. The second layer is designed for representing the internal neural information. The connections between the first layer and the second layer, called the receptive fields of neurons, are self-adaptively learned based on principle of sparse neural representation. To this end, we introduce Kullback-Leibler divergence as the measure of independence between neural responses and derive the learning algorithm based on minimizing the cost function. The proposed algorithm is applied to train the basis functions, namely receptive fields, which are localized, oriented, and bandpassed. The resultant receptive fields of neurons in the second layer have the characteristics resembling that of simple cells in the primary visual cortex. Based on these basis functions, we further construct the third layer for perception of what and where in the superior visual cortex. The proposed model is able to perceive objects and their motions with a high accuracy and strong robustness against additive noise. Computer simulation results in the final section show the feasibility of the proposed perceptual model and high efficiency of the learning algorithm.

关键词： visual perception visual cortex computational model receptive fields simple cells complex cells

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

Fabrication and application of nanocrystalline diamond films

引用

金刚石与磨料磨具工程 2008年第S1期28卷 97-103页

作者： Sun Fanghong~1,Zhang Zhiming~2.Shen Hesheng~2.Guo Songshou~2.(1.School of Mechanical engineering,Shanghai jiao {2. university,Shanghai 2.02.0,china 2.Research institute of Micro/Nanometer Science & Technology, Shanghai jiao {2. university,Shanghai 2.02.0,china)

Nanocrystalline diamond films were deposited on Co-cemented carbide substrates using acetone/ H2.Ar gas mixture by bias-enhanced hot filament chemical vapor deposition（HFCVD） *** evidence of nanocrystallinity,smooth... 详细信息

Nanocrystalline diamond films were deposited on Co-cemented carbide substrates using acetone/ H2./sub>/Ar gas mixture by bias-enhanced hot filament chemical vapor deposition（HFCVD） *** evidence of nanocrystallinity,smoothness and purity was obtained by characterizing the sample with scanning electron microscopy（SEM）,X-ray diffraction（XRD）,Raman spectroscopy,atomic force microscopy （AFM ）,and field emission transmission electron microscopy（FE-TEM ）.The results show that nanocrystalline diamond films consists of nanocrystalline diamond grains with sizes range from 2. to 80 nm and contain a large amount of grain *** surface roughness of the films is measured as Ra<*** Raman spectroscopy,XRD pattern,and FE-TEM image of the films indicate the presence of nanocrystalline diamond.A new process is used to deposit composite diamond coatings by a two-step chemical vapor deposition procedure,including first the deposition of the rough polycrystalline diamond and then the smooth fine-grained nanocrystalline diamond *** composite diamond coatings not only display good adhesion and wear resistant properties,but also have smooth surfaces that are liable to *** coating technology can not only meet the requirement of the adhesion of diamond coatings,but also reduce surface roughness of diamond coatings effectively,thus remove the obstacles for the industrialization of CVD diamond *** diamondcoated dies with these composite coatings show obvious effect in the practical application.

关键词： Hot filament CVD Nanocrystalline diamond film Composite coatings Diamond-coated dies

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

Relations Between Characteristic Function,Positive P-Representation and Coherent Thermal State

引用

Communications in Theoretical Physics 2007年第7期48卷 67-70页

作者： FAN Hong-Yi XU Xing-Lei Department of Material Science and engineering,university of Science and Technology of {2.,Hefei 2.002.,{2.2.Department of Physics,Shanghai jiao tong university,Shanghai 2.0030,{2.3 Department of Physics,Heze university,Heze 2.4015,{2. Department of Material Science and engineering University of Science and Technology of China Department of Physics Shanghai Jiao Tong University Department of Physics Heze University

We employ the coherent thermal states(a kind of entangled states)in thermal field dynamics to establisha complete entangled state formalism expressing pseudo-classical representations of density operator for light ***,the relationship between the coherent thermal state and the characteristic function and the positive Prepresentation in quantum optics theory are obtained.

关键词： coherent thermal state characteristic function positive P-representation

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

Analysis of Microstructure and Orientation in X80 Line Pipe Steels

引用

Journal of Iron and Steel Research International 2011年第S1期18卷 664-668页

作者： JI Ling-kang 1,2.LI Yang 2.3,MENG Li 3,LI He-lin 2.(1.School of Material Science and engineering,Xi’an jiao{2. university,Xi’an 710049,Shaanxi,china 2.CNPC Tubular Goods Research institute,Xi’an 710065,Shaanxi,china 3.School of Material Science and engineering,university of Science and Technology Beijing,Beijing 100083,china) Xi An jiao tong Univ Sch Mat Sci & Engn Xian 710049 Shaanxi Peoples R China CNPC Tubular Goods Res Inst Xian 710065 Shaanxi Peoples R China Univ Sci & Technol Beijing Sch Mat Sci & Engn Beijing 100083 Peoples R China

Microstructures in X80 line pipe were classified by SEM *** experimental results showed that the microstructures in X 80 line pipe steels were complicated consisting of polygonal ferrite,bainite and acicular *** relation within acicular ferrite was investigated systematically by means of *** sub-structures were observed maximum in acicular ferrite which gives high strength and high toughness to line pipe *** K-S orientation relation was generally observed between acicular ferrite and austenite during phase *** low energy CSL boundary characterized by Σ3 orientation relation according to Brandon criterion appeared with higher probability,which was benefit to improve the mechanical properties of line pipe *** orientations or texture of initial austenite grains could be deduced based on the Σ3 orientation relationship of acicular ferrite variants.

关键词： acicular ferrite EBSD K-S orientation relation TMCP

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

Accountable authority key policy attribute-based encryption

引用

Science china(Information Sciences) 2012年第7期55卷 1631-1638页

作者： WANG YongTao 1,2.,CHEN KeFei 1,3 ,LONG Yu 1,4 & LIU ZhaoHui 2.1 Department of Computer Science and engineering,Shanghai jiao {2. university,Shanghai 2.02.0,china 2.china Information Technology Security Evaluation Center,Beijing 100085,china 3 Shanghai Key Laboratory of Scalable Computing and Systems,Shanghai jiao {2. university,Shanghai,2.02.0,china 4 State Key Laboratory of Information Security,Graduate School of Chinese Academy of Sciences,100039,china 1. Department of Computer Science and engineering Shanghai Jiao Tong University Shanghai 200240 China2. China Information Technology Security Evaluation Center Beijing 100085 China3. Shanghai Key Laboratory of Scalable Computing and Systems Shanghai Jiao Tong University Shanghai 200240 China4. State Key Laboratory of Information Security Graduate School of Chinese Academy of Sciences Beijing 100039 China

We present an accountable authority key policy attribute-based encryption (A-KPABE) *** this paper,we extend Goyal's work to key policy attribute-based encryption *** first generalize the notion of accountable authority in key policy attribute-based encryption scenario,and then give a *** addition,our scheme is shown to be secure in the standard model under the modified Bilinear Decisional Diffie-Hellman (mBDDH) assumption.

关键词： accountable authority key policy attribute-based encryption standard model access structure

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

WATER ENTRY OF A WEDGE BASED ON SPH MODEL WITH AN IMPROVED BOUNDARY TREATMENT

引用

Journal of Hydrodynamics 2009年第6期21卷 750-757页

作者： GONG Kai LIU Hua WANG Ben-long Department of engineering Mechanics Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Ocean engineering Shanghai Jiao Tong University Shanghai 200240 China

The hydrodynamic problem of a two-dimensional wedge entering water is studied based on Smoothed Particle Hydrodynamics （SPH） model. A non-reflection boundary treatment for SPH method is proposed to reduce the reflection of sound waves. The boundary pressure is obtained using an improved coupling boundary treatment approach, which is validated by comparing the simulation results with experimental and analytical results in literature. A series of cases with different initial entering velocities are simulated. The maximum force on the wedge and the corresponding time required to reach it for the different cases of initial entering velocities of the wedge are obained and fitted into formulas against the initial entering velocity of the wedge. The maximum drag coefficients of the wedge for the different cases with Froude number greater than 2.are all near the value of 0.91.

关键词： water entry Smoothed Particle Hydrodynamics (SPH) non-reflection boundary

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：