bluuebunny/crossref_metadata_2025 huggingface dataset:
In Situ Mechanical Property Measurement of Titania Nanowires
Authors: Chang Ming , Deka Juti Rani , Lin Chia Hung , Chung Chin Chung
Published: June 2010

One-dimensional (1D) nanostructure such as nanowires (NWs), nanobelts and nanorods have attracted tremendous attention in recent years due to their exceptional micro-structural properties and novel potential applications. In the present investigation, titania (TiO2) nanowires are synthesized by microwave hydrothermal process (MHP) treating TiO2 nano powder with NaOH inside a microwave oven for 5h at 210°C and 350W. The mechanical properties of as synthesized TiO2 nanowires are determined by bending it with a nanomanipulator inside a scanning electron microscope (SEM). Young’s moduli of the nanowires are measured to be approximately 11.870.923GPa.
Achieving Traceability of Industrial Computed Tomography
Authors: Bartscher Markus , Neukamm Marko , Hilpert Uwe , Neuschaefer-Rube Ulrich , Härtig Frank , Kniel Karin , Ehrig Karsten , Staude Andreas , Goebbels Jürgen
Published: June 2010

Achieving traceability is crucial for complex measurement techniques, especially for coordinate measuring machines (CMMs). For CMMs using tactile probes, traceability can for certain measurements be achieved using model-based uncertainty budgets. Up to now, uncertainty simula-tions could be used applicable only for tactile CMM measurements of regular geometries, but are available as an add-on for different CMMs. This procedure is accepted by guidelines and inter-national standards (VDI/VDE 2617-7, supplement 1 [1] to GUM). Furthermore, empirical ap-proaches to assess the measurement uncertainty by means of calibrated workpieces or prior know-ledge exist or are under development. These approaches can as a matter of principle also be used for CMMs featuring computed tomography (CT). In this paper, the empirical assessment of the mea-surement uncertainty of the upcoming measurement technology CT [2, 3] will be discussed uniting the present approaches and the current knowledge, with the focus being on the applicability of con-cepts for users in industry. For this purpose, the influences on dimensional CT measurements are analyzed and evaluated, taking the measurement data of a current industrial micro CT system as a basis.
Developments in Homodyne Interferometry
Authors: Schott Walter
Published: June 2010

The trend in many fields of enabling technologies, such as microelectronics, communications, microsystems, and micromechanics, toward imposing increasingly stringent demands upon precision continues. Those types of technologies allow creating micromechanical components having dimensions of a few micrometers that have to be accurately measured, positioned relative to one another, and assembled. In that conjunction, laser-interferometric metrology provides unique opportunities that combine measurements over large ranges at extraordinarily fine resolutions with traceability of measurement results to international length standards. Laser-interferometric metrological systems may be used for measuring displacements ranging from subnanometers to several meters, without need for reconfiguring the optical or electronic systems involved or their component devices.
Grinding of Arc-Sprayed Tungsten Carbide Coatings on Machining Centers - Process Configuration and Simulation
Authors: Biermann Dirk , Mohn T. , Blum H. , Kleemann H.
Published: June 2010

This paper describes the special demands placed on the grinding of arc-sprayed WC-Fe coatings on a conventional machining center. Basic process configuration, experimental results, measurement methods and an approach for a hybrid simulation system are presented.
Determination of the Effective Film Mechanical Properties in the Impact Test Imprint of Coated Specimens
Authors: Bouzakis Konstantinos D. , Skordaris G. , Bouzakis Emmanouil , Lili Eleftheria
Published: June 2010

If the film of a coated component deforms plastically because of operational loads, residual stresses are developed in the coating material after the load removal. In this way, material mechanical properties changes occur due to endogenous reasons i.e. induced by the coating crystalline structure plastic deformation. In this case, the determination of the effective film mechanical properties has been introduced in a recent publication [1]. Moreover, if the loading conditions lead only to a substrate plastic deformation, the coating remains elastically deformed during the relaxation, due to the substrate residual stresses. Thus, the associated material mechanical properties changes are caused by exogenous parameters related to the permanent substrate deformation. In the present paper, a novel experimental-analytical method based on FEM calculations is introduced to determine the effective film mechanical properties when the coating is stressed elastically due to a plastic substrate deformation. The perpendicular impact test is a convenient experimental procedure to investigate such an effect because under appropriate loading conditions, the substrate deforms plastically and the coating elastically. The pristine constitutive law of the applied PVD film was determined by nanoindentation and FEM supported results evaluation. Impact tests were conducted at various loads and loading cycles. The impact test was simulated by a two dimensional FEM model. Additionally, the developed elastic residual stress fields in the coating and the plastic ones of the substrate in the imprint were determined. In these calculations, a rate-independent anisotropic plasticity with kinematic hardening material law was considered and the film as an anisotropic material with variable mechanical properties in three main directions. Finally, by a FEM supported simulation of the nanoindention, the coating’s load-displacement behaviour in various areas of the impact imprint were predicted and the effective coating mechanical properties as well.
Suspension Plasma Spraying of Triboactive Coatings for High Temperature Applications
Authors: Erne Martin , Kolar Daniel , Möhwald Kai , Bach Friedrich Wilhelm
Published: June 2010

In recent years, suspension plasma spraying (SPS) was investigated regarding the spraying of functional coatings with deterministic abilities. In this contribution the possibilities are discussed to achieve oxide ceramic coatings based on titania by SPS, which show a reduction of their coefficient of friction under dry sliding conditions. Besides the possibility to mix different feedstock suspensions in the process, the achievable low thickness and homogenous microstructure of suspension-sprayed coatings shall allow an operation in fields, where high demands towards the adhesion, cohesion and near net shape are made.
Surface Zone Modification by Atmospheric Plasma-Nitriding (APN) with the Aid of the Transmitted Plasma-Arc
Authors: Hassel Thomas , Birr Christoph , Bach Friedrich Wilhelm
Published: June 2010

Current research activities at the Institute of Materials Science of the Leibniz Universität Hannover are engaged with the development of a new nitriding-process. This process has the convenience that a nitridation of surfaces is possible under atmospheric conditions so that the device treatment may be performed fractional. With the aid of the transmitted plasma-arc, diffusion able nitrogen is applied at the workpiece surface. This atomic nitrogen diffuses into the device and constitutes special- and iron-nitrides which raises the abrasion- and corrosion resistance.
Influence of Malonic Acid on the Corrosion and SCC Behaviour of Anodic Coated 1050 Al-Alloys
Authors: Spathis Panayotis , Papastergiadis Efthimios , Stalidis Georgios , Papanastasiou Georgios
Published: June 2010

Aim of the present work is the study of corrosion and stress corrosion cracking behaviour of 1050 Al-Alloy anodised in a 3M H2SO4 anodising bath with the presence in it of malonic acid, in various concentrations and anodising current densities. The investigation was carried out by SCC (Stress Corrosion Cracking) tests and electrochemical measurements. The influence of applied potential on SCC behaviour was also examined. The corrosion and SCC behaviour of anodised 1050 Al-Alloy was found to vary with malonic acid concentration, anodising conditions, applied potential and stress level. In SCC conditions all prepared coatings protected the bare alloy, with better protective properties in the case of 0.015M concentration of malonic acid prepared with a 6 A.dm-2 anodising current density. The coating prepared in these conditions had better mechanical properties as indicated from the increased protection at a high stress level and also the better behaviour in corrosion, without stress, conditions of coatings prepared in different conditions of malonic acid concentration and anodising current density. For the interpretation of the results, properties of the anodic coatings as thickness, packing density, coating ratio, roughness, were also studied. The anodic coating formed in a electrolytic bath of 0.015M concentration of malonic acid and a 6 A.dm-2 anodising current density was found to be less porous, more compact and rough, with better oxide structure. Prepared coatings were found to increase protective properties in an area of applied potentials slightly more anodic than the free corrosion potential values.
Pre PVD-Coating Processes and their Effect on Substrate Residual Stress in Carbide Cutting Tools
Authors: Denkena Berend , Breidenstein Bernd
Published: June 2010

Cohesive damage of PVD-coated cemented carbide cutting tools is ascribed to the residual stress state of the substrate subsurface. The present paper shows the formation of the substrate residual stress in the process chain as well as the stability of the single process steps referred to the scattering of the residual stress values. Depth resolved residual stress measurements across coating and substrate subsurface show a layer in the substrate, where possibly tensile stress occurs, from where cohesive damage may be initialized during tool use. Results of experiments are presented, where the influence of parameter variations in pre coating processes on the residual stress state is investigated. The characteristics of compressive residual substrate stress during the final PVD-process is presented as well as a correlation between coating and substrate stress.
Simulation of Dynamic Lubricant Effects in Sheet Metal Forming Processes
Authors: Ludwig Manuel , Müller Cecile , Groche Peter
Published: June 2010

Tribology plays an important role in sheet metal forming processes relating to near net shape production processes and achievable surface qualities. Nearly every process is realized by using characteristic lubricants affecting the tribological system to achieve the desired results. Deterministic structures on sheet surfaces can result in less friction and higher drawing ratios. This is caused by hydrostatic pressures build up in closed lubricant areas and hydrodynamic pressures due to the lubricant motion especially in thin fluid films [1, 2, 3]. Friction mechanisms in the mixed lubrication regime are not fully understood till today. The numerical simulation of flows in lubricant pockets and their influence on surface evolution are promising ways to gain more knowledge of the lubricant behavior in tribological systems. Therefore, this paper shows results of combined numerical and experimental approaches. The described simulations of closed lubricant pockets on surfaces identify influencing parameters. Strip drawing experiments are done to verify the simulations. The influence and the importance of local pressures due to viscous effects in the lubricant are considered as well as the necessity to use fluid-structure-interactions to simulate the behavior of lubricants in the tribological system.
Performance of γ-Al2O3-Based Coatings and Environmentally Friendly Lubricants in Cutting Operations of Difficult-to-Machine Materials
Authors: Klocke Fritz , Cordes Susanne Eva , Gerschwiler Klaus
Published: June 2010

The machining of difficult-to-cut materials such as nickel-based alloys and austenitic steels are focus in a lot of investigations for a long time. When machining these materials, different effects are overlapping. Approaches to overcome the several problems when machining these materials can be an appropriate coating system for the cutting tool as well as innovative lubricants. Coatings are one of the most common possibilities to improve the cutting performance of tools, notably the tool life as well as the material removal rate. Aluminium oxide coatings made by Physical Vapour Deposition (PVD) technology is a promising coating material for cutting operations. Due to its outstanding characteristics, such as high hardness, high thermal stability and low tendency to adhesion aluminium oxide is a predestined material for the machining of difficult-to-cut materials. In combination with innovative environmental friendly lubricants, the performance of cutting tools is increasing significantly. The objective of this work is to study the wear mechanisms and the cutting performance of aluminium oxide based coated tools in turning, drilling and milling operations.
Diamond Cutting of FeN-Layers on Steel Substrates for Optical Mould Making
Authors: Brinksmeier Ekkard , Gläbe Ralf , Osmer Jen
Published: June 2010

The mass production of glass or plastic components by replication techniques, like hot pressing or injection moulding, requires inserts made of temperature resistant and hard materials. Generating an optical surface finish in these materials is time consuming and difficult. By using thermo-chemically treated steels as mould materials diamond cutting processes generating high form accuracies and low surface roughness can be applied without significant tool wear.
Nanostructured Bionic PVD-Coatings for Forming Tools
Authors: Tillmann Wolfgang , Vogli Evelina , Herper Jan , Haase Matthias
Published: June 2010

It is very important to minimize wear and friction in forming processes in order to avoid adhesion between work piece and tool. For the realization of these requirements, the PVD-coating system CrAlN was deposited and tested on substrates made from high speed steel 1.3343 by means of a reactive sputter process. The coatings were deposited as single- and multilayers with a metallic Cr-interlayer. Prior to realizing the appropriate coating design, the substrates were pre-structured. For this purpose natural surfaces were used as a pattern and tested in this research work. The skin of an insect serves as a model and its fine structures were reproduced on the substrate surface by milling. The generated specimens were analyzed with a scanning electron microscope, nanoindenter and ball on disc tester to compare the performance of the coating systems.
Characterization of Heat Transfer Coefficients of Tool Materials and Tool Coatings for Hot Stamping of Boron-Manganese Steels
Authors: Wieland Michael , Merklein Marion
Published: June 2010

One characteristic of hot stamping of ultra high strength steels is the high wear rate of the used tools which leads to shorter tool life. Coatings improving wear resistance can increase the lifetime of the used tools but process relevant data such as the heat transfer capability of coated tool steels are missing. Within this paper the heat transfer capabilities of coated tool steels for the hot stamping processes are determined. Therefore different coating systems based on AlCrN are applied on the tool steels and the pressure dependent heat transfer coefficient is determined using process relevant conditions. As semi-finished blank the hot stamping steel 22MnB5 with an aluminum-silicon pre-coating is used. With respect to a finite element analysis of the forming operation of the hot stamping process the heat transfer coefficient represents an important input data for the process layout.
Comparison of Nitride and Noble Metal Coatings for Precision Glass Molding Tools
Authors: Klocke Fritz , Dambon Olaf , Georgiadis Kyriakos
Published: June 2010

The complexity of optical components increases steadily in recent years, while their dimension de-crease. This situation makes the production of state of the art optical components by grinding and polishing very difficult and expensive. However, the technology of precision glass molding can be used to replace these traditional manufacturing methods by a single step replicative process. To achieve economies of scale with precision glass molding, a long molding tool lifetime is necessary. This can only be realized by applying protective PVD coatings on the molding tool surfaces. Well known thin hard coatings like TiAlN or CrN, as well as noble metal coatings are possible candidates. However, practical testing of carious coating-glass combinations in precision glass molding machines is not feasible due to long process times that make such testing very expensive and time consuming. In this work, these coatings are compared with each other and in combination with various glass types by performing oxidation and contact angle tests. The results of these tests are compared to the results of practical tests, in order to determine to which extent such model tests can replace practical testing.
Interlaboratory Comparison of Friction Conditions in Hot Stamping Operations
Authors: Borsetto Francesca , Ghiotti Andrea , Bruschi Stefania , Stoehr T. , Lechler J. , Merklein Marion
Published: June 2010

The paper presents results obtained at two labs, on in Germany and one in Italy, in terms of friction coefficient as function of hot stamping process parameters. Even if the testing procedures and analysis tools to evaluate tribological conditions are different for the two labs, both the approaches show a similar trend as regards the friction coefficient dependence from the process parameters.
A Kind of JIT Management Mode for Discrete Machining Job Shop
Authors: Song Yu Chuan , Dong Xiao Lei , Lei Qi
Published: June 2010

It is one of the effective way to apply JIT (just in time) mode in the management of discrete job shop to improve the productivity of job shop. A kind of JIT management mode for discrete job shop is proposed in this paper. The machining tools such as cutters and frocks are distributed with materials in JIT mode, so that the inventory of machining tools is reduced, and productivity is improved. The process of distribution plan under this mode is studied. The JIT distribution management information system is developed based on the proposed studies, and is applied in a traditional machining job shop with satisfactory result.
The Ego-Motion Detection Algorithm for Digit-Writing Hand Gesture Recognition
Authors: Li Bo , Zhang Er Liang
Published: June 2010

This paper addresses digit-writing hand gesture recognition using ego-motion detection algorithm. In training stage, according to the manual labeled feature points, the ego-motion detection algorithm is constructed and the corresponding average feature is obtained. In recognition stage, the interesting digit-writing hand gesture region is firstly segmented by skin and movement cues. Secondly, the models are fitted to the image that includes the hand gesture, and the relative features are extracted. Thirdly, the classification is done by comparing the extracted features and average features.
Determination of Trace Manganese in the Source Water by Oscillographic Polarography
Authors: Zhou Ji Hong , Lian Yan Jun
Published: June 2010

Manganese in water has low toxicity. The product will form the yellow stain when the industrial water content is high. There are many ways to monitor it. The determination of trace Manganese in the YangjiaoPu source water by oscillographic polarography is introduced in this paper. The result indicate that the standard deviation of this method is 0.001~0.002 mg/L, the relative standard deviation is 2.3~2.5% and the mark-on recovery ranged from 96.8%～105.8%. At the same time several problems needing attention about experiment process are posed in this paper.
The Biorthogonality Property of the Multidimensional Wavelet Packets with Multi-Scale Factor
Authors: Zhou Jian Feng , Wang Ping An
Published: June 2010

In this article, we introduce a sort of vector-valued wavelet packets with multi-scale dilation of space , which are generalizations of multivariaale wavelet packets. A method for designing a sort of biorthogonal vector-valued wavelet packets in higher dimensions is presented and their biorthogonality property is characterized by virtue of time-frequency analysis method, matrix theory, and operator theory. Three biorthogonality formulas regarding these wavelet packets are established. Furtherore, it is shown how to obtain new Riesz bases of space from these wavelet packets.
The Properties of a Class of Higher-Dimensional Composite Wavelet Packet Bases
Authors: Li Hong Wu , Liao Dong
Published: June 2010

In this paper, we introduce a class of vector-valuedwavelet packets of space , which are generalizations of multivariate wavelet packets. A procedure for constructing a class of biorthogonal vector-valued wavelet packets in higher dimensions is presented and their biorthogonality properties are characterized by virtue of matrix theory, time-frequency analysis method and operator theory. Three biorthogonality formulas regarding these wavelet packets are derived. Moreover, it is shown how to gain new Riesz bases of space from these wavelet packets. obtained.
The Character of Multiple Affine Pseudoframes with Filter Banks Based on a Pyramid Decomposition Scheme
Authors: Zhang Tong Qi
Published: June 2010

In recent years, frames have been the focus of active research, both in theory and applications. In this paper, the notion of multiple affine pseudoframes for subspaces of space is introduced. The concept of a generalized multiresolution structure(GMRS) is proposed. The sufficient condition for the existence of a class of multiple pseudoframes with filter banks is obtained by virtue of a generalized multiresolution structure. An approach for constructing one GMRS of Paley-Wiener subspaces of is presented based on the pyramid decomposition scheme The characteristics of affine pseudoframes for subspaces of space is provided.
A Novel Approach for Constructing a Class of Orthogon Vector-Valued Wavelets with Finite Support
Authors: Guo Shui Wang , Shi Jin Chang
Published: June 2010

In this paper, the notion of orthogonal vector-valued wavelets is introduced. A necessary and sufficient condition on the existence of orthogonal vector-valued wavelets is presented by using paraunitary vector filter bank theory, time-frequency analysis method and matrix theory. A new method for constructing a class of orthog- -onal finitectly supported vector-valued wavelets is presented.
The Research of Multiple Subspace Pseudoframes with Integer Translation
Authors: Shi Jin Chang , Guo Shui Wang
Published: June 2010

Wavelet analysis has been a powerful tool for exploring and solving many complicated problems in natural science and engineering computation. The definition of multiple pseudofames for subspaces with integer translation is proposed. The notion of a generalized multiresolution structure (GMS) of is also introduced. The construction of a GMS of Paley-Wiener subspaces of is investigated. The pyramid decomposition scheme is derived based on a GMS. As a major new constribution the sufficient condition for the existence of multiple pseudoframes for subspaces is derived based on such a GMS.
Specific Properties of a King of Trivariable Wavelet Packets with Respect to an Integer-Valued Dilation Matrix
Authors: Han Jin Cang , Li Yang
Published: June 2010

In the work, the concept of orthogonal vector-valued trivariate wavelet packets, which is a
generalization of uniwavelet packets, is introduced. A new method for constructing them is developed, and their characteristics is discussed by using time-frequency analysis method, matrix theory and finite group theory. Orthogonality formulas are established.
The Orthogonality Character of Matrix Univariate Wavelet Packets Concerning an Integer Factor
Authors: Han Jin Cang , Li Yang
Published: June 2010

The notion of matrix-valued multiresolution analysis. A procedure for designing orthogonal matrix-valued univariate wavelet packets is presented and their orthogonality properties are discussed by means of time-frequency analysis method, matrix theory and functional analysis method. Three orthogonality formulas concerning these wavelet packets are obtained. Finally, one new orthonormal basis of are obtained by constructing a series of subspaces of orthogonal matrix-valued wavelet packets.
A Study of Matrix-Valued Trivariate Wavelet Packets Associated with an Orthogonal Matrix-Valued Trivariate Scaling Function
Authors: Zhang Jian , Guo Shui Wang
Published: June 2010

Wavelet analysis has become a developing branch of mathematics for over twenty years.
In this paper, the notion of matrix-valued multiresolution analysis of space is introduced. A method for constructing biorthogonal matrix–valued trivariate wavelet packets is developed and their properties are discussed by means of time-frequency analysis method, matrix theory and functional analysis method. Three biorthogonality formulas concerning these wavelet packets are provided. Finally, new Riesz bases of space is obtained by constructing a series of subspaces of biorthogonal matrix-valued wavelet packets.
Research on Web Service-Based Image Processing for Mobile Commerce
Authors: Yu Xiao Gao
Published: June 2010

The resource limitation of mobile commerce systems cause the problem that the existing image processing software based on the centralized computing mode had difficulty in running in mobile commerce systems. This paper gives a solution for the problem by adopting web service-based image processing approach. The solution reduces the resource consumption of mobile commerce systems by distributing image processing tasks to service providers, service registry centers and service requesters. Furthermore, a web service discovery algorithm called WBSD is presented. Service providers adopt the WBSD to provide efficient services and increase image processing speed. Compared with traditional methods of image processing, Web service-based image processing method has the advantages of loose coupling and component oriented and can take full advantage of the computing resources in heterogeneous network. Thus web service-based image processing approach can effectively solve the resource bottle-neck that traditional image processing software had.
The Description of Two-Direction Biorthogonal Finitely Supported Wavelet Packets with Poly-Scale Dilation
Authors: Du Shu De , Yuan De You
Published: June 2010

Wavelet analysis has become a popular subject in scientific research during the past twenty years. In this paper, the notion of biorthogonal two-direction compactly supported wavelet packets with poly-scale is developed. A new method for designing two-direction biorthogonal wavelet packets is proposed and their properties is investigated by algebra theory, means of time-frequency analysis methodand, operator theory. The direct decomposition relationship is provided. Finally, new Riesz bases of space are constructed from these wavelet packets. Three biorthogonality formulas regarding these wavelet packets are derived.
The Nice Feature of Orthogonal Vector-Valued Bivariate Wavelet Packets with Arbitrary Integer Dilation Factor
Authors: Zhao Jian Tang , Li Jie
Published: June 2010

In this paper, the notion of orthogonal vector-valued bivariate wavelet packets, which is a generalization of uni-wavelet packets, is introduced. A procedure for constructing them is presented. Their characteristics is investigated by using time-frequency analysis method, matrix theory and finite group theory. Orthogonality formulas are established. Orthonormal wavelet packet bases are obtained.
Noise Reduction of ECG Signal Based on Morphological Filtering and WT
Authors: Zhang Dan , Sui Wen Tao
Published: June 2010

In order to eliminate the noise in ECG signal and increase the diagnosis efficiency, a method based on morphological filtering and wavelet algorithm is proposed. The morphological filters is used to filter out the baseline interference signal, and the wavelet transform is applied to remove high frequency interference. The experiment proves that the algorithm is effective.
Research on Straight-Line Extraction for Aerial Images
Authors: Li Chang , Hu Min , Liu Peng Cheng
Published: June 2010

Line and plane feature can provide more information than point feature, thus 3D reconstruction based on high-level features, such as line and plane, is an important development trend in Digital Photogrammetry and Computer Vision. Several methods for extracting straight line are researched, and the main procedures can be introduced as follows. Firstly, image is preprocessed by Wallis filtering that is used to enhance the image contrast and reduce the noise, so it is easy to extract more lines. Secondly, Laplacian of Gaussian operator (LoG) and Canny operator algorithms are compared to locate the edge by detecting discontinuity variation in image. Thirdly, Hough transform or perceptual organization based on hypothesis testing are compared and tested for combining and fitting fractured short line segments into a whole line. Lastly, the least square template matching algorithm (LSTM) is done to get higher precise (sub-pixel) located lines. In the experiment, different algorithms for straight line extraction of aerial images are realized and compared, in order to faster achieve richer and higher accurate straight line information, which can pave the way of image understanding and image matching.
The Review of Cache Partitioning in Multi-Core Processor
Authors: Li Shuo , Xu Gao Chao , Dong Yu Shuang , Wu Feng
Published: June 2010

With the development of microelectronics technology, Chip Multi-Processor (CMP) or multi-core design has become a mainstream choice for major microprocessor vendors. But in a chip-multiprocessor with a shared cache structure , the competing accesses from different applications degrade the system performance , resulting in non-optimal performance and non-predicting executing time. Cache partitioning techniques can exclusively partition the shared cache among multiple competing applications. In this paper, we first introduce the problems caused by Cache pollution in multicore processor structure; then present the different methods of Cache partitioning in multicore processor structure¬ －－categorizing them based on the different metrics. And finally, we discuss some possible directions for future research in the area.
Fault Detection of Bridging Faults in Digital Circuits by Shared Binary Decision Diagram
Authors: Chen Ling , Pan Zhong Liang
Published: June 2010

A new test generation method for the bridging faults in digital circuits is proposed in this paper, the method is based on shared binary decision diagram. The shared binary decision diagram can represent many logic functions simultaneously by sharing isomorphic subgraphs, it is used to represent the digital circuits with multiple primary outputs. The binary decision diagram is constructed respectively for the normal circuit and faulty circuit having a bridging fault. The test vectors of the bridging fault can be produced by a XOR operation of the two binary decision diagrams. The experimental results on a lot of benchmark circuits demonstrate that the test method proposed in this paper can get the test vectors of the bridging faults if the faults are testable.
Detection of Crosstalk Faults in Digital Circuits by Testability Evaluation
Authors: Chen Ling , Pan Zhong Liang
Published: June 2010

The increase in dense interconnect as well as the clock frequency of digital circuits has led to an increasing number of crosstalk faults. A new test approach for crosstalk faults in digital circuits is presented in this paper, the approach aims at the faults of crosstalk induced pulse, uses controllability and observability measures of the signal lines to produce the test vectors of crosstalk faults. Choose a lot of paths from the fault site to the primary outputs of circuit, and carry out forward tracing and backward tracing, until every signal line is assigned a logic value and no conflict arises. Experimental results on a lot of digital circuits show that the test approach proposed in this paper can generate the test vectors of crosstalk faults, and can obtain high fault coverage.
Anti-Synchronization of Chaotic System by Sliding Mode Control and Observer
Authors: Li Qiao Ping , Li Wen Lin
Published: June 2010

The Anti-synchronization of chaotic systems with uncertainty by sliding mode control is studied. Using the principle of poles assignment method, the switching function is designed to guarantee Anti-synchronization of slide mode with nonlinearity terms. Using exponent hitting condition of sliding mode, a robust anti-synchronization controller is proposed. In contrast to the previous works, sliding mode of this controller is free from the influence of disturbance, and the system has both better robustness and quick tracking. Therefore the computation is simple and the conservation is smaller. Finally, Simulation results verify the effectiveness of the proposed scheme.
A Provably Secure Certificate-Based Signature Scheme with Bilinear Pairings
Authors: Zhang Jian Hong , Chen Hua , Yang Yi Xian
Published: June 2010

Traditional public key cryptosystem (PKC) requires high maintenance cost for certificate management. Although, identity based cryptosystem (IBC) reduces the overhead of management, it suffers from the drawback of key escrow. Certificate-based cryptosystem solves certificate revocation problem and eliminate third party queries in the traditional PKI. In addition, it also solves the inherent key escrow problem in the IBC. In this paper, we proposed an efficient certificate-based signature and the result shows that the scheme is provable secure against two game attacks of certificate-based signature in the random oracle model. The security is closely related to the difficulty of solving the discrete logarithm problem.
The Design and Implementation of Team Cost Accounting System Based on Dynamic Data Collection
Authors: Guan Hong Jun
Published: June 2010

With the development of information technology, as the basis of economic accounting of the companies, it is possible for team cost accounting to be provided with various of basic data collection, data processing and sharing of such data. First of all, the related technology is introduced, then combined with the production process of C4 workshop, it described the analysis result and scheme. In this process, obtaining dynamic data from production equipment is the first step, then according to different devices and various requirements of product cost accounting, calculate the cost for each team, and finally realize the need for assessment of the teams.
Existing Condition Analysis on Bad Faith of Auto Bidding for Search Engine Keywords
Authors: Zhang Qing Hua
Published: June 2010

With rapid development of search engine users, the auto bidding for search engine keywords is stealthily rising and such kind of service is now essentially being conducted on the majority of existing search engines. For merchants, users and even the search engine service suppliers, auto bidding is of many advantages, which is also thought it has brought forth serious phenomenon of bad faith in terms of such kind of similar search websites, leading to a crisis of confidence. This text is intended to give it a full analysis on the various problems of bad faith resulted from the auto bidding for search engine keywords. And it is in consideration of the huge controlling forcing and social influence of the search engines, there lies a great need in strengthening the closer government supervision. While guaranteeing a healthy and orderly development of search engine, our purpose is to render back an honest and clean searching environment of internet information to the public.
Schumann Resonance Measurement Based on Nonlinear Interaction
Authors: Cao Bing Xia , Qiao Xiao Lin
Published: June 2010

Schumann Resonance relates with global temperature variations, new geophysics phenomena in the low ionosphere and short-term earthquake prediction etc. In this paper based on the nonlinear modulation model of high frequency and extreme-low frequency electromagnetic waves in low ionosphere, the Schumann Resonance observing is researched. Taking the fair weather electric field in account, the cross modulation index was 4.2×10-4. At the first Schumann Resonance observatory of China, the first 4 peaks of Schumann Resonance respectively at 7, 14, 20, 26Hz were obtained in demodulation spectra of the high frequency time service signals. The parameter characteristics of Schumann Resonance in the low ionosphere were analyzed under the geographical condition of middle latitude area. The feasibility of Schumann Resonance measurement by demodulating the spectra of HF has been verified. The non-linearity between Schumann Resonance and very low frequency signals also was discussed.
The Design of an Enterprise Information Resource Management Platform Based on IRP
Authors: Du Jiang Yi , Niu Yan
Published: June 2010

Information Resource Planning (IRP) is a comprehensive planning for the information that enterprise management activities needed which from the production, acquisition, to processing, storage, transmission and use and is the information construction foundation. Information Resource Standard Management Platform (STP) is based on the IRP standards and the model results and provides the tools of data element management and the platform of results demonstrated platform for IRP implementation.
Study on the Integrated Modeling of the Entire Rider-Vehicle-Road System
Authors: Zhang Yong Lin , Guo Wei Feng , Zhang Yun Qing , Yu Qun
Published: June 2010

The demands of high-quality dynamic performance and short development time for vehicle production can only be fulfilled by the application of advanced design, simulation and optimization technologies. Virtual prototyping (VP), the analysis and simulation technology based on a fully developed computer model, represents a future way for cost and time efficient design of vehicles and can perform the same as those on the physical prototyping. This paper describes an integrated modeling method, based on the topological structure of a heavy vehicle and oriented to ride dynamics, of a human-vehicle-road system. A multi-body simulation model was chosen as the integration platform for the virtual prototyping since it provided the flexibility to integrate all relevant aspects such as rigid body movement, road-induced vibration and the driver’s responses to the vibration. The time domain model of the stochastic excitation from the road irregularities was numerically reconstructed as input data to VP and the feeling evaluation model in time domain, equivalent to conditional frequency evaluation, was used to the vehicle’s riding comfort simulation. Through integrating the sub-models in VP and combining the data of the sub-models it became possible to predict dynamic performance of vehicles by virtual prototyping technology.
Test Investigation of Velocity Distribution Considering Snow Particles Participating
Authors: Yan Ke Qin , Zhou Xuan Yi , Gu Ming
Published: June 2010

This paper presents the fitting expressions of mean velocity profile and turbulence intensity for wind-snow coupling conditions. Different materials were adopted to simulate the roughness of saltation snow particles to get the distribution of wind velocity in the simple wind tunnel. Test results indicate that velocity profile obeys the logarithmic distribution; the turbulence intensity obeys power law distribution. The influence height of saltation snow particles to the velocity profile limited to 10 cm above from the bed surface.
Comprehensive Assessment of Bridge Based on a New Tool: Clear Mathematics
Authors: Li Yan Cang , Liang Xing Ming , Wang Du
Published: June 2010

In order to find a more effective method for the safety assessment of the bridge, a new mathematic, the clear mathematics was proposed. First, the basic knowledge of the clear mathematic was introduced. Second, the assessment model was set up. Finally, the model was employed to the assessment of a bridge. Engineering practice shows the efficiency and the rationality of the method. This study provides a new method for the safety assessment.
A Note on an Enhanced Three-Party Authentication Key Exchange Protocol
Authors: Tan Zuo Wen
Published: June 2010

Recently, Chen et al. proposed an efficient three-party encrypted key exchange protocol based upon Schnorr’s digital signature scheme with fewer rounds. However, J.H. Yang and C. C. Chang showed that Chen et al.’s protocol still has the high computation cost and communication cost. Moreover, Chen et al.’s protocol suffers from stolen-verifier attacks. Then J.H. Yang and C. C. Chang proposed a three-party authenticated key exchange protocol without password by using elliptic curve cryptography. Their improved protocol requires smaller transmitted message size and less communication times, which is well suitable for resource-limited environments such as mobile communication and mobile commerce. Unfortunately, we find that Yang et al.’s protocol is vulnerable to replay attacks, denial-of-Service attacks and impersonation attacks.
Impact of Different Turbulence Models on Air Pollutant Flow and Distribution
Authors: Wang Peng , Mu Hai Lin
Published: June 2010

The aim of this study is to provide a simulation of air pollutant in a street canyon and investigates the impact of different turbulence models on the flow structure and air pollutant dispersion. Three studied k-ε turbulence models are evaluated to determine the most optimum turbulence model and the most suitable parameters of inlet boundary velocity and turbulent kinetic energy for simulating the pollutant dispersion in the present street canyon. The calculated data of the numerical model are then validated by comparing the extensive experimental database obtained from Kastner-Klein and Plate. Compared with the measured results, it can be concluded that modified RNG model with the inlet velocity profile and turbulent kinetic energy and turbulent dissipation rate provides the best calculated results, while standard and RNG k-ε turbulence models under-predict the pollutant concentrations.
Direct Drive Volume Control Electro-Hydraulic Servo Ship Rudder
Authors: Su Wen Hai , Jiang Ji Hai
Published: June 2010

Direct drive volume control（DDVC）electro-hydraulic servo system has synthesized the advantages of high power of hydraulic system and flexible control of the motor. It also has other features such as energy saving, high efficiency, small bulk and high reliability. On the background for application to the ship steering system, DDVC electro-hydraulic servo system for the control actuator of ship is designed and the mathematic model is made and simulated with Matlab/Simulink. The steering gears closed-loop system’s simulation obtained the perfect dynamic performances; verify the correctness of the design with its control strategy. It can satisfy the ships request of boat to steering gears system and the DDVC electro-hydraulic servo system will be a extensive prospective power equipment of the control actuator of ship in future.
Dynamic Force Measurement of Model Container to Centrifuge Nacelle Used in Centrifuge Model Explosion Test
Authors: Yue Xiao Hong , Mao Yong Jian , Pu Hao , Niu Bao Liang , Wang Lei , Wang Song , Wu Dai Rong , Yu Yi
Published: June 2010

The technique of centrifuge model test has been widely used in geotechnical mechanics and engineering because of its low cost and low test scale. In order to investigate the dynamic behaviors of the geotechnical model under explosion, we are developing an explosion geotechnical centrifuge. The dynamic environment of explosion is necessary to be determined for the strength design of the centrifuge nacelle. This paper presents the dynamic force measurement of the model container to the centrifuge nacelle under a typical explosion. Firstly, three cylindrical supports were designed and calibrated by quasi-static compressive tests. The force-strain relations are measured and linearly fitted. Secondly, an explosion test was performed and the dynamic strain histories of the supports were measured. Then the dynamic force histories were obtained combined with the calibration results. The investigation provides an understanding of the dynamic environment for the centrifuge nacelle design.
A Novel Method for Palmprint Recognition Based on Tensor Subspace Learning
Authors: Xiao Yong Liang
Published: June 2010

Recently, palmprint identification has been developed for security purpose. In this paper, we propose a novel palmprint recognition scheme which has three features: 1) representation of palmprint images by Local Binary Pattern (LBP); 2) dimensionality reduction by tensor subspace learning; and 3) recognition by multiple kernel classification method based on tensor analysis. LBP can effectively capture substantial palm features while keeping robustness to illumination. Then we reduce the dimensionality of each palmprint samples based on tensor subspace learning which can preserve the spatial structure of LBP. Tensor multiple kernel SVM classifier is finally employed for palmprint recognition. Experimental results on PolyU palmprint database show the effectiveness of the proposed method.
The Application Study of E-Books Resources Integrated System
Authors: Yu Xue Dou
Published: June 2010

By analyzing the structure of PDF files as well as the characteristics of CORBA technology and taking the information dump from PDF files to SQL Server as an example, the paper illustrates the achievement of integrated system of E-book resources. The paper shows the system framework and process design. With a view to the integration of electronic resources, this paper can play a reference role to the integration of E-books resources.
ARRA: An Associated Replica Replacement Algorithm Based on Apriori Approach for Data Intensive Jobs in Data Grid
Authors: Jiang Jian Hua , Ji Hui Fang , Xu Gao Chao , Wei Xiao Hui
Published: June 2010

Creating many replicas in the processing of data-intensive jobs in data grid is an efficient strategy. Replica replacement is the crucial step to this strategy. Economic model, popularity model and hybrid model etc. have been proposed to solve this issue of replica replacement with analysis and prediction based on each data file, however, these models neglect association relationships among different data files. To find out these association relationships hidden in data-intensive jobs, Apriori algorithm in data mining field is adopted to analyze behaviors of each data-intensive job. An associated replica replacement algorithm based on Apriori approach in data grid is proposed in this paper. This algorithm has two major steps: 1) associated behavior analysis and classification of data files in each node; 2) generation and application of replica replacement rules. Our proposed algorithm is simulated in Optorsim to be compared with LFU algorithm. The experiment shows that there is a relative advantage compared with LFU in mean job times of all jobs, number of remote file access and effective network usage perspectives.
Design and Implementation of Multilayer Situation Decision Support System for Regional Economy
Authors: Wan Hou Chong , Dong Yi Bing , Jiang Xiu Hua
Published: June 2010

In this dissertation, the theory, mathematical model and algorithms on the Multilayer Situation Decision-making are firstly introduced. And then the design and implementation of the Multilayer Situation Decision Support System based on MATLAB GUIDE are presented. In order to achieve the purpose of both testing the performance of the DSS and solving the optimization problem of the Hebei Provincial economic system, the empirical analyses are put forward afterwards. In the end, some suggestions for the policymakers are also proposed.