bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Research of Ultrasonic Motor Characteristics in Micro EDM
Authors: Lin Hai Bo , Yang Guo Zhe
Published: May 2011

On ultra precision cutting, grinding and non-traditional machining, there is a hard problem between long travel and high precision. A new multi-dimension, low speed, nanometer level precision minute electric spark forming system driven by ultrasonic motors was built. A study of the basic characteristics of the ultra-precision platform driven by the ultrasonic motor was conducted in this paper. The control method of digital PID combined with bidirectional static error compensation enables the platform to realize the submicron accuracy in a stroke of hundreds of millimeters, with the minimum speed of 0.1μm/s and the minimum closed loop step of 100nm. All the achievements would provide theoretic reference to the design of these kinds of ultra precision platform.
Preparation of Zero-Valent Iron Nanoparticles and Study of Dispersion
Authors: Ding Qing Wei , Qian Tian Wei , Liu Hong Fang , Wang Xue
Published: May 2011

Zero-valent iron (ZVI) nanoparticles are prepared by wet chemical method, unlike conventional methods, we applied a water-soluble dextrin、CMC and starch in the preparation. The starch serves as a stabilizer and dispersant that prevents the resultant nanoparticles from agglomeration, and characterized by XRD、SEM and USP. Compare the dispersion of particles and particle size in progress of reducing. According to the characterization results, the nanoparticles can be dispersed more efficiently, maintained the activity of it owned and kept the stability longer with the dispersing agent. Based on the results obtained, the starch as a dispersion agent on the preparation of Zero-valent iron (ZVI) nanoparticles is an ideal approach.
Approximation Theory on the Electromagnetic Fields in Metal Cavity
Authors: Wu Liang Neng , Xu Jiang Feng , Jiang Li Zhen , Zhou Yun
Published: May 2011

A new method in perturbation theory of electromagnetic fields in metal cavity has been proposed in this paper. When a medium is introduced in metal cavity, the electromagnetic fields and oscillating frequency will be changed. The changed fields can be expanded as the fields of all modes in the original empty metal cavity. The expressions of the fields and the frequency in the various orders of approximation have been derived, that is important for such applications as the precise measurement of high permittivity of microwave materials.
The Effects of Nano Pt/Carbon Black Compound Coating on the Electro-Catalysis Properties of the Graphite Electrode
Authors: Lou Bai Yang , Zhou Han , Xu Bin
Published: May 2011

The modification of Nano Pt and carbon black compound coating on the fuel cell’s graphite electrode by the method of vacuum ion plating and ethanol catalytic combustion. The microstructures and the electro catalysis properties of the electrode surface before and after the modification were analyzed and tested with the methods of scanning electron microscope(SEM), transmission electron microscope(TEM), electrochemical workstation and so on. The effects of nano Pt and carbon black on the electrode’s electro catalysis properties were investigated. The Study results have shown that carrying on electrochemical properties test to the graphite electrode which has been treated with nano Pt and carbon black compound surface modification, there will be three oxidation peaks in its cyclic voltammograms and the background current will be higher. Compared with the nano Pt surface modification, the electrode which has been treated with nano Pt and carbon black compound surface modification has better ethanol electro catalysis properties. The high specific surface area acquired from the nano carbon black surface modification and the synergic action of the catalytic material Pt can improve the ethanol electro catalysis properties of the electrode effectively.
A New Hybrid Optimization Algorithm and its Application in Job Shop Scheduling
Authors: Cao Xian Zhou , Yang Zhen He
Published: May 2011

In this paper, a dual-resource constrained job shop scheduling problem was studied by designing a hybrid genetic algorithm based on Genetic Algorithm (GA) and Simulated Annealing (SA). GA is used to search for a group of better solutions to the problem of minimizing production cost and then SA is applied to searching them for the best one. The combination of GA and SA utilizes the advantages of the two algorithms and overcomes their disadvantages. The operation-based encoding and an active schedule decoding method were employed. This hybrid genetic algorithm reasonably assigns the resources of machines and workers to jobs and achieves optimum on some performance. The results of numerical simulations, which are compared with those of other well-known algorithms, show better performance of the proposed algorithm.
A Computer Simulation on Human Injury during the Aircrew/Seat Through-the-Canopy-Ejection
Authors: Li Zhi Qiang , Yao Xiao Hu , Zhao Long Mao
Published: May 2011

For through-the-canopy-ejection-saving system with miniature detonation cord (MDC), screw/seat system has penetrated canopy to successfully escape after the strength of canopy weaken by MDC in the case of emergency. Injury of human head and spine is serious due to striking between aircrew/seat and canopy during the ejection. In the paper, considering MDC installed along all-around of canopy, the initial cut slot is used to model the damage of canopy impacted by detonation wave from MDC. Simplified finite element model of through-the-canopy-ejection-system has been established according to ergonomics. In FEM, canopy as PMMA employs elastic viscoplastic material model combined with continuum damage mechanics, crew is modeled as 50% deformable dummy. FEM is solved using nonlinear dynamics explicit code LS-DYNA3D. Head impact force and dynamic response index (DRI) of spine are obtained, and meet the requirement of nation army standard. Simulation results indicate that MDC installation way is avail to reduce physiology damage of airscrew. It also provides science foundation for safe design and manufacture of through-the-canopy-ejection-system.
Artificial Intelligence Optimization and Experimental Study of Auto Panel Stamping Process
Authors: Zhou Lin , Cheng Xiao Min
Published: May 2011

Auto panel stamping is a complicated plastic deformation process with geometry nonlinear, material nonlinearity and numerous process parameters. The stamping process of a typical auto panel wheel wrap was studied by artificial intelligent optimization and physical experiment. The prediction model of object function was established using artificial neural network. In object function, blank-holder force, drawbead height and fillet radius were selected as the optimized variables and prevention of rupture was considered as the optimization objective. Process parameters optimization was performed with genetic algorithm. The optimized process parameters were used to guide die design and testing, and the result of wheel wrap stamping showed that the forming quality was obviously improved. So the process optimization based on artificial neural network and genetic algorithm is feasible and efficient for auto panel stamping.
Study on the Fault Diagnosis of Turbine Based on Support Vector Machine
Authors: Liu Bao Ling
Published: May 2011

The paper presented the improved “one to many” classification algorithm in the basis of analyzing the shortcoming of the two traditional multi-classification algorithm, and established multi-fault classifier based on SVM to class the turbine typical faults. The results shows that the classifier may get satisfied effect.
The Study of Risk Assessment on the Ship Oil Spill Diffuseness
Authors: Sun Yong Ming
Published: May 2011

Ship oil spill is one of the most serious marine pollutions. By assessing the risk of oil spill’s diffuseness, revealing the complex rules of its occurrence and taking appropriate preventive and emergency measures, we can minimize the pollution. With Yangshan’s waters in Shanghai as the background, this paper, using hierarchic analysis, gives a model of risk assessment on the oil spill’s diffuseness in Yangshan and a risk assessment on the oil spill’s diffuseness on the real ship, providing a scientific basis to effectively avoid pollution caused by oil spill diffuseness.
Fault Diagnosis System Based on Dynamic Bayesian Network
Authors: Wang Hong Bo , Ma Zhong Gui , Tu Xu Yan
Published: May 2011

The paper focus on dynamic bayesian network (DBN) inference system and its application on the natural gas transmission and distribution network for the system fault diagnosis which is including time restriction (that is the earliest start time and the latest end time) for task. DBN is a graphic model which can describe the relationships between variable data, and used for reasoning. After we research the basic model of DBN, and the maximum depend algorithm is improved which which can increase the feasibility of natural gas transmission and distribution network system. we can see the new model is more accuracy than the traditional technical fault diagnosis clearly. Also, simulation result can verify the design of DBN is effectively and valuable.
A Relative Colorimetric Rending Mapping Method Based on BP Neural Network
Authors: Zhao Lei , Chen Guang Xue
Published: May 2011

There are very complicated nonlinear relations between input value and presentation color of digital prepress devices, as well as in the gamut mapping among different devices. Not all the relations can be described by linear model properly. In recent years, neural network and black box theory are introduced to describe the relations. In this research, the printer gamut is divided into micro space sections, a relative colorimetric rending mapping method is proposed based on BP neural network theory to complete the gamut mapping from monitor gamut to color printer. Experimental results show that the model reduces the color error of color blocks between the two devices, and the color rendering method can be used for gamut mapping of image with less continuous tone.
Improving Genetic Algorithm Based Parameter Optimizing LSSVM Model for Tyre Regression
Authors: Zhang Xiao Long , Li Liang , Song Jian , Sheng Dan Dan
Published: May 2011

According to the requirement of vehicle dynamics' accurate simulation and control, the paper studies the tyre regression algorithm based on the tyre bench test data. Due to the tyre test's characters of few data and big discreteness, the method of least squares support vector regression (LSSVM), which has the superiority of structural risk minimization, was selected to find the nonlinear mapping between input and output variables of tyre test data. Removing data gross error and improving the sparsification measures were taken to increase the calculation real time of standard LSSVM algorithm. An adaptive genetic algorithm (AGA) with global searching ability was chosen to determine the kernel function and regularization parameters of LSSVM. Test data set’s regression root mean square error (RMSE) was taken as the fitness function of AGA. Finally, the tyre test data under steady state sideslip condition was provided to simulate and verify the effectiveness of tyre regression algorithm, according to the precision and real time requirements of vehicle dynamic simulation and control.
Research on Approximation Measurement of Enterprise Information System Based on Object-Based Knowledge Mesh
Authors: Cao Hai Wang , Xue Chao Gai
Published: May 2011

This paper deals with an approach to the approximation measurement on the enterprise information system (EIS) based on its formal representation. To explore the approximation between modules in EISs and lay foundation for the reconfiguration of EIS, an approximation measurement on the object-based knowledge mesh (OKM) and information transfer relationship mesh (ITRM) corresponding to EIS is proposed. Firstly, based on the definitions of the approximation on atom knowledge point (KP) and relationships, the approximation measurement on OKM with only atom KPs is proposed. Then, the approximation measurement on ITRM is also given, with the steps of the approximation measurement on EIS presented in detail as well. Finally, based upon the above, the approximation measurement on EISs is illustrated by an example to show the application of the proposed method.
Study on Dynamic Performance of Step--Down DC-DC Converters
Authors: Wang Yuan Bin
Published: May 2011

Closed loop converters are strongly nonlinear system. Dynamic behavior is difficult to investigate by traditional approach. For some PWM controlled converters, low frequency ripple may occur in the output voltage and results in unsteadiness to the system. In this paper buck converter is taken as an example to investigate the stability feature. A delay in the feedback loop is related with stability closely, so the converters with delay and without delay are analyzed in detail, respectively. The second-order differential equation for output voltage profile is established. Characteristic equations are deduced from the differential equations. Based on Hurwitz Stability Criterion, stability requirement is derived from characteristic equations. It is shown that converters without delay in the feedback loop are steady. On the other hand converters with delay in feedback loop may produce low frequency ripple in some cases. Regulating parameters can avoid the low frequency ripple phenomenon. The frequency and amplitude of the low frequency ripple voltage are determined by using zero-pole analysis method. The proposed approach is verified by simulation and experiment. The simulation and experiment results demonstrate that the analysis is correct.
Management Effectiveness Calculation Model and Method of Government Performance Evaluation
Authors: Bu Wen Bin , Xu Yan Li , Liu Jing , Feng Ying Jun
Published: May 2011

A new method is presented in this paper in order to depict the effective effort level of the managers in quantity. The concept, model, and specific calculation method of management effectiveness are given through performance evaluation analysis in different time. As an example, government management effectiveness is calculated. The results indicate that this method is fair and effective.
Game Analysis between Principal and Agent under Principal-Agency Relationship
Authors: Meng Fan Sheng , Sui Xin , Xu Yan Li
Published: May 2011

The problem that principal can effectively supervise the agent has not been solved. Based on principal-agent relationship, mathematical game model is constructed and backward induction method in game theory is used to obtain the equilibrium between the principal and agent. Discussion of the equilibrium solution will reveal some features of the principals about monitoring behavior. The supervision of the principal will be increased with the strength of institutional constraints. When the institutional constraints are complete, principal will choose complete supervision to the agent. But when the institutional constraints are not fully complete, the principal's supervision is not entirely complete. The principal and agent tend to choose collusion to some extent. Therefore, certain measures should be taken to improve the supervision motive from principal and reduce the degree of collusion.
Dynamic Properties of Hydraulic Excavator’s Simulation and Analysis Based on ADAMS
Authors: Zhao Chun Hua , Chen Shi Jun , Zhong Xian You , Zhao Mei Yun , Tan Zhong Qi
Published: May 2011

This paper used Pro/E and ADAMS to build the virtual prototype of a hydraulic excavator. After the co-simulation, which joined ADAMS with Pro/E, forces of the bucket’s joints were recorded. This study succeeded in the application of Virtual Prototyping Technology and laid a basis for further studies of the excavator.
Application of Progressively Statistical Discriminant Models
Authors: Fan Bing Chen
Published: May 2011

Discriminant analysis is an important multivariate statistical analysis, and plays an important part in pattern classification, data mining, machine learning et al. In this paper, based on principle of progressively statistical discriminant analysis under Fisher rule, a progressively statistical discriminant model is set up. The authors analyzed the data about the occurrence of the second generation of the corn borer in 21 years from 1985 to 2006 (except 1990) at Linyi, Shandong Province, and then set up three graded recognition pattern. The results tested the pest data showed that the fitting rate is 95.24%, 92.31% and 100% respectively, and that accuracy of forecast is satisfactory.
Influence of Composition and Hot Rolling Conditions on Microstructure and Texture of Nb-Ti Stabilized FSS
Authors: Liu Yan Dong , Yang Yi Qiao
Published: May 2011

In this paper, the influence of chemical compositon on the formability of γ-fibre texture, and the hot band microstrcture has been studied. Experiments have been conducted to investigate the effect of hot rolling conditions. Nb-Ti added and Nb-Ti free specimens hot rolled in differencd hot rolling conditions have been compared. The results show that, the change in band width is dependent on hot rolling tempreture. When the hot band are rolled at the temperature of 1150-950 °C, large sizes on ferrite grain are observed, and this character is presented more obviously in the specimen with no Nb-Ti. As the incresaing of the hot rolling temperature, the intensity of γ-fibre texture decreases. γ-fibre texture presented in Nb-Ti added specimen is stronger under three hot rolling conditions.
Seismic Response Analysis Method of High Core Rockfill Dam
Authors: Zhang Jing Kui , Zhang Liao Jun , Di Sheng Jie
Published: May 2011

A dynamic constitutive model is suggested based on dynamic triaxial test data of dam materials. Combining with construction of a high core rock-fill dam, several key issues, such as dam seismic response, dam permanent deformation, filter layer anti-liquefaction, dynamic strength of the core wall are analyzed by using 3-D dynamic effective stress analysis method. And some useful conclusions and regularity are obtained in the aspects of seismic response and anti-seismic properties. The analysis method and conclusions could be referred to the analogous engineering.
Optimal Management of Multi-Campus University: A Case in Jiangxi
Authors: Guo Ya Xiong
Published: May 2011

The research of multi-campus university management, which is specific for a particular region, in particular to the Jiangxi Province of, is still blank. This paper traces the formation and development of multi-campus University in Jiangxi, carding the management status of multi-campus University in Jiangxi, analyzes the problems of multi-campus university development in Jiangxi, and on this basis, puts forward the measures of optimal management.
On the Reasons of Social Security System Right Absence for Migrant Workers in China
Authors: Sun Lei
Published: May 2011

Compared to the China's urbanization and increased speed of rural workers’ group size, the author analyzes the reasons of social security system right absence for migrant workers from the perspective of both macro-and micro-urban, where dual urban-rural social structure decided by dual economic base is the basic reason that causes the social security system right absence. Besides, the existing social insurance system against those migrant workers and the weak awareness of migrant workers all have no adverse effect on the social security system right absence .
BP Neural Network Fitting for Spectra of Blast Furnace Raceway
Authors: Yang Bo , Li Ning , Lei Liang , Wang Xue
Published: May 2011

Three-layer BP neural network, particularly using Levenberg-Marquardt back-propagation with early stopping algorithm, is widely used in curve fitting, attributing to its fast speed and free from over-fitting. Hence, the trained network by Levenberg-Marquardt back-propagation was used for curve fitting of the radiation spectrum of blast furnace raceway. The results showed that Levenberg-Marquardt back-propagation with early stopping algorithm presented a better fitting ability. Additionally, the results of spectral fitting model showed that the blast furnace raceway had an effective radiation spectrum in the wavelength range from 420nm to 880nm, where the raceway could be considered as the gray body radiation.
Functionary Mechanism of Technology Innovation on Industrial Competitiveness
Authors: Hu Yu Chen
Published: May 2011

This article utilized the technological innovation theory to analyze the functionary mechanism of technology innovation on industrial competitiveness thoroughly, this was: The technological innovation enabled a state industry to have a more obvious superiority in the international market compared to the competitor, thus seized the bigger market share by reducing the operating cost of the industry, promoting the differentiation of the product, enhancing industrial productivity and the quality of the product and promoting the advancement of the industry’s internal structure.
The Empirical Analysis of Market Performance of Automobile Industry Market in China
Authors: Xu Wen Jie
Published: May 2011

This text finds that the concentration ratio of automobile industry market in China overall takes on rising trend, which is based on the calculation of automobile industry market's concentration ratio in China between 2001 and 2008, the characteristics of market structure is similar to oligarch competition since 2008. According to industrial organization theory, people come up with the theoretical model of automobile industrial performance, including the variables of industry concentration ratio, profit ratio, research and development intensity, product differentiation, entry barriers and so on. Empirical evidence shows that the relation between profit ratio and the concentration ratio of automobile industry market is remarkably positive, while it is negatively related with research and development density and product differentiation. It also finds that the key point to improve profit ratio of China's automobile industry is enhancing central technical level.
Research Development of Biomedical Titanium Alloy
Authors: Li Yong Hua , Liang Xin Jun , Fan Tao
Published: May 2011

Biomedical titanium alloys can be used for replacement and repair surgeries of human hard tissues. In recent years, the new b type titanium alloys with low elastic moduli and excellent biocompatibility have been developed by choosing low cytotoxic elements. Furthermore, new type of porous titanium alloys can lower elastic modulus effectively and contribute to the ingrowth of tissues. The present research status of new b type titanium alloys and porous titanium alloys have been introduced in this literature, the future research trend has also been discussed.
Stability Analysis and Performance Evaluation of a Feedback Controller for Local Control of Sound
Authors: Tseng Wen Kung
Published: May 2011

This paper investigates the performance and stability of a virtual microphone feedback controller for local control of sound through theoretical analysis and simulations. A novel method to design a stable feedback controller for the local control system is also presented in this paper. The local control system is designed to attenuate a broadband disturbance at a point near the listener’s ear, i.e. the virtual microphone, rather than at the control microphone, i.e. the physical microphone. The results showed that if a good performance was to be achieved the controller would be unstable. This is because the magnitude of the response of the virtual plant is lower than that of the physical plant. The feedback controller in this work is designed to minimize the noise at the virtual microphone, with a virtual plant response used in the performance objective. However the physical plant is used in the stability constraint. Therefore there is a trade-off between the performance and controller stability.
An Approach for Lean Product Innovation Management
Authors: Wang Lei , Ming Xin Guo , You Jing , Kong Fan Bin , Li Dong
Published: May 2011

Product innovation is the pivotal factor for enterprise to keep advantages of competition, and the effective product innovation management is the impetus for the enterprise about keeping having the energy of innovation. The situation, research background and requirement of product innovation management as well as lean management are introduced firstly. Based on the wonderful applied foreground and predominance of lean management in product innovation, a lean product innovation framework is proposed in this article. The framework is in favor of establishing the lean management mode and evaluation system of lean innovation, which helps to promote the innovation capability of enterprise finally.
Displacement Analysis of the 3SPS-3CCS Mechanism Based on Hyper-Chaotic Three-Step Iterative Method
Authors: Luo You Xin , Che Xiao Yi , Liu Qi Yuan , Zeng Bin
Published: May 2011

The forward displacement analysis of parallel mechanism is transformed into find the solutions of complicated nonlinear equations and it is a very difficult process. Taking chaotic sequences as the initial values of the three-step iterative method, we can find all the solutions of equations quickly. Making use of existing chaos system and discovering new chaos system to generate chaotic sequences with good properties is the key to the three-step iterative method based on Chaos sequences. Based on utilizing hyper-chaotic Hénon mapping to obtain initial points, a new method of finding all real number solutions of the nonlinear questions is proposed. Using cosine matrix method, the author established the mathematical model of forward displacement for the generalized 3SPS-3CCS parallel robot mechanism and a numerical example is given. Compared to the quaternion method building mathematical model, the result shows cosine matrix method building mathematical model and hyper-chaotic three-step iterative method to find solution is brief and high calculation efficiency as the calculation is done in real number range. The proposed method has universality which can be used in forward displacement of other parallel mechanism.
Displacement Analysis of the 3SPS-3CCS Mechanism Based on Hyper-Chaotic Damp Least Square Method
Authors: Luo You Xin , Liu Qi Yuan , Che Xiao Yi , Zeng Bin
Published: May 2011

The forward displacement analysis of parallel mechanism is attributed to find the solutions of complicated nonlinear equations and it is a very difficult process. Taking chaotic sequences as the initial values of the damp least square method, we can find all the solutions of equations quickly. Making use of existing chaos system and discovering new chaos system to generate chaotic sequences with good properties is the key to the damp least square method based on Chaos sequences. Based on utilizing hyper-chaotic Hénon mapping to obtain initial points, a new method of finding all real number solutions of the nonlinear questions is proposed. Using cosine matrix method, the author established the mathematical model of forward displacement for the generalized 3SPS-3CCS parallel robot mechanism and a numerical example is given. Compared to the quaternion method building mathematical model, the result shows cosine matrix method building mathematical model and hyper-chaotic damp least square method to find solution is brief and high calculation efficiency as the calculation is done in real number range. The proposed method has universality which can be used in forward displacement of other parallel mechanism.
Study on the Finite Element Numerical Simulation of Automobile Crossbeam Stamping Forming
Authors: Ma Xiao Chun , Shen Wei Bing , Zhuang Yi Qiang
Published: May 2011

This paper is concerned with the quantitative effect of design parameters on the stamping process of automobile crossbeam. The considered parameters in this paper are the friction coefficient, the die fillet radius and the blank holding force, which greatly affect the metal flow during stamping. Based on the finite element numerical simulation, the stamping shaped process of the automobile crossbeam is numerical simulated with the explicit finite element method with various parameters by dint of Dynaform software. According to the simulation results, the forming limit diagram(FLD) and the wall thickness distribution of cloud on the stamping processes are technologically analyzed, the reasons and control methods of wrinkling are also pointed out, and then the optimal parameter combination of the automobile crossbeam is obtained by orthogonal experiments. It is noted that the parametric study of design parameters such as µ , BHF and RD are very important in the process design of the complicated member.
Study of the Bearing Capacity of Single Gravelly Pile
Authors: Han Xiao Bin , Yuan Dong Xia , Bao Chun Sheng
Published: May 2011

There is no a united formula about how to calculate the bearing capacity of a single gravelly pile yet. Recent years, the engineers had developed several theory or experience formulas through many experiments and much studying. But every one has its drawback in calculating. The writer of this paper expresses a new formula bases on Brauns theory to choose by designers.
Research on Construction Method of Optimization Model between Customer Requirements and Product Technical Characteristics Configuration
Authors: Yang Xiao An , Chen Hao , Wang Bing Bing , Liu Xiao Hong , Zhang Wei She
Published: May 2011

The degree of satisfying the customer requirements was determined by the diversity of product function and form, in order to improve the satisfaction, the mapping relation between customer requirements and technical characteristics should be analyzed to construct configuration optimization model. This paper integrated triangular fuzzy number, BP network and GA to propose a method of constructing optimization model of product technical characteristics configuration corresponding to customer requirements, the model was established based on customer transaction data history. This method acquired the information of customer requirements and preference and that of purchased products’ function and form characteristic by analyzing and extracting customer transaction information, then applied BP network to express the mapping relations between customer requirements and product technical characteristics. The optimization model took the cost and time as constraint with the customer requirements as target, finally used genetic algorithm with MATLAB to solve. The electric bicycle was taken to illustrate the build process.
Research of Embedded Internet Technology for Internet of Things
Authors: Pang Yu Jun , Wang Jun , Wei Li Feng
Published: May 2011

Development of Internet of things, the application of embedded Internet technology will be wide. This paper introduces characteristic of embedded Internet technology, concludes and compares resolutions of how to connect embedded equipment to Internet. At the same time, this paper analyses characteristic of embedded TCP/IP protocol and present method for developing embedded TCP/IP protocol.
Optimization Allocation Research of Enterprise Resources Based on Dynamic Programming
Authors: Zhang Mei , Wen Jing Hua , Xiao Wei
Published: May 2011

Dynamic programming algorithm is classical strategy to solve the optimization problem. The distributing of enterprise resource is a multistage decision problem, having the characteristic of dynamic programming algorithm. We establish distribution of mathematical model of planning target, using dynamic programming principle and method to divide enterprise resource allocation stage reasonably, and then we use the recursion method to structure dynamic programming equation from the bottom up. Using VC++6.0 development platform is to compute the optimal decision-making sequence and maximum of profit. Dynamic programming makes optimum resource allocation for an enterprise, and it is high application value in resource allocation.
Research and Realization Based on Content Video Retrieval
Authors: Chen Li Wei , Gao Yong Li
Published: May 2011

Along with the multimedia technological development and the large-scale database widespread application, the content video retrieval technology obtains the rapid development, at the same time, the algorithms were also proposed. This article has carried on the induction summary to these new theory technologies based on the content video retrieval demonstration system. This article first introduced based on the content video retrieval essential technology including regards the lens the boundary examination and the division, the essential frame selection the characteristic withdraws, the similar match and the video frequency gathers the kind and so on. Simultaneously provided video frequency retrieval essential technology some algorithms,and carried on the summary regarding the recent years based on the content.
The Analysis and Study of Methods of Calculating Oblique Edge Shear Force
Authors: Yang Zhan Yao , Yuan Hong Ling
Published: May 2011

In existent reference material on stamping, a range of application of the calculating formula of shearing force of die of inclined edge is not limited. This gives rise to misunderstanding very easily. Now this paper from different points of view just analyses and discusses the Calculation method for shearing force with different rake angle of inclined edge, so it is very practical and significant.
Effects of Exterior Window on Temperature Distribution and Thermal Comfort of Commercial Buildings with Radiant Floor Heating System
Authors: Cai Wei , Wu Zhao Hui , Li Jun Ming
Published: May 2011

The purpose of this study is to investigate the effect of boundary conditions on the temperature distribution and thermal comfort of a radiant floor heating system and their practical application to commercial buildings. Indoor thermal environment, along with human response, was studied by means of CFD. The three-dimensional temperature distribution was numerically simulated with the zero-equation turbulent model. And two typical operating models, which there is and there is no windows in the room were analyzed in detail. The results show that the radiant floor heating system can meet the demand of comfortable degree, and that the temperature field is enormously influenced by boundary conditions. It is necessary to install curtains to decrease the radiant heat transfer of the cooling glass surface and other control methods to ensure the room to be a thermal comfortable environment.
Variable Parameters of Military Electronic Components in High Temperature
Authors: Xu Jian Jun , Zhang Ya , Li Bo
Published: May 2011

Military electronic components apply in high temperature conditions has become one of the hot research field of reliability field, then the temperature characteristics of the military electronic components are known by designers is key to guarantee high reliability of military equipment under high temperature conditions. So, a scheme of the high temperature dynamic test based on low consumed power test circuits and PC is worked out in this paper. It can be used for test the temperature performance of the military electronic components, and feasibility of the schemes are tested and verified by experiment. And the changing law of the components parameter are got in this conditions which found out components parameters approximate linear in 25°C～200°C, of nonlinear in large range in the very high temperature of 200°C～350°C conditions, which can offer some reference value to prolong lifetime of military electron device.
ГУЧТЬЯР Method to Determine the Base Circle Radius of Cams
Authors: Liu Hu Ran
Published: May 2011

This paper presents a new way to determine the base circle of a cam by using the displacement and velocity graphs. This is a simple method to guarantee the obtained pressure angle aless than the allowed pressure angle [a], while the work of calculation is reduced dramatically.
Determination and Distribution of Heavy Metals in the Municipal Waste Incinerator Slags from Guangdong Province
Authors: Liu Jin Yong , Sun Shui Yu , Zhang Rong Xue , Zhong Sheng
Published: May 2011

The content of heavy metals (Cu, Cr, Cd, Pb, Zn and Ni) was determined by Atomic absorption spectrophotometer (AAS) and their distributions were analyzed in various waste incineration slags. The results showed that the particle size less than 5mm were a major component in the slag, which were about 59.42% in all the incineration slags. The content of heavy metals was different in the incineration slags. The content of heavy metals Zn, Cr and Cu were significantly higher than that of other heavy metals and that of Pb was in second, followed by Ni, and that of Cd was in the least. The contents of these heavy metals were higher than that of the soil environmental quality standards (GB15618-1995) and the background values in soil of Guangdong. The distribution of heavy metals in different particles of the slag were very different, in which the content of Cr, Zn, Cd and Ni were higher in the small particle sizes, but that of Cu and Pb was not obvious in various particles. In all, the content and distribution of heavy metals were mainly with composition of the waste and the heavy metal characteristics.
ARM7-Based File System Design
Authors: Zhang Zheng Yuan , Li Jing Yin
Published: May 2011

ARM is the newest 32-bite RISC microprocessor. Its high performance, low power consumption and flexible extension make ARM particularly suitable for designing embedded system. Therefore, the realization of the FAT16 file system with ARM can satisfy the demand of file storage in embedded system. This article descripts the simple realization of FAT16 file system with ARM 7.
Spectra Modeling of Blast Furnace Raceway by Neural Network
Authors: Yang Bo , Li Ning , Wang Xue , Lei Liang
Published: May 2011

Neural network with Levenberg-Marquardt back-propagation training is widely used in curve fitting, according to its fast speed and free from over-fitting. In order to solve the issue on local minimum that may be found in Levenberg-Marquardt back-propagation with early stopping, and to get optimum number of hidden neurons, the least mean test errors algorithm was used in repeatedly training the three-layer feed-forward network with variable structure. Furthermore, the trained network was used for curve fitting of the radiation spectrum of blast furnace raceway. The results on spectra modeling of blast furnace raceway showed that this algorithm presented a better fitting ability, characterized by the reservation of the details of the original spectra and better generalization ability.
Integrating RE/RP for Rapid Product Development Based on Haptic Modeling
Authors: Cheng Si Yuan , Liu Jun Hua , Zhang Xiang Wei
Published: May 2011

As product varieties increase and life cycles shorten, the need for rapid product development becomes critical to maintain competitiveness in the market. Reverse engineering technology enables us to quickly create the CAD model of product. Rapid prototyping is another technology that can shorten the product development time by fabricating the physical prototype of a part using layered manufacturing technique. And how to integrate these two technologies to facilitate rapid product development is an important issue. Haptic modeling has the advantages of allowing the user to touch, feel, manipulate, and model point cloud in a 3D environment that is similar to a natural setting. A high-quality STL file can be obtained from the haptic modeling system which is ideal for rapid prototyping. In this paper, a novel method of integrating RE/RP for rapid product development based on haptic modeling is presented, which can increase the efficiency for RE/RP integration and promote product innovative design. Case study is also given to demonstrate the feasibility of the proposed method.
Effects of Global Climate Change on Water Resources in Rwanda: Lake Kivu Case Study
Authors: Habiyaremye Gabriel , Ge Ji Wen , Mupenzi Jean de la Paix , Balogun Waheed O. , Jerop Sitienei Anne
Published: May 2011

Climate change is emerging as one of the most miscellaneous expressions of the global change nowadays. It potentially affects ecosystems including water resources. The change of climate also has significant impacts on the availability of water, as well as the quality and quantity of water that is available and accessible. Aiming at studying the effect of climate change on water resources, 25 years collected secondary data of both climatic and hydro-meteorological stations were used and Statistical analysis was performed using ORIGIN PRO 8.0 Software. The study linked the surface elevation of Lake Kivu variation with respect to climate change where the level of the lake matches to pluviometric and anomalies values. Finally, the statistical analysis could not directly link the temperature variation with that of surface water level in the lake. Climate change is real and happening now and surely affects water resources among others making an urgent need to control anthropogenic inputs into the atmosphere, one of the factors forcing climate change.
The Variation Coefficient Method for Reliability Sensitivity Analysis of Cylindrical Helical Spring
Authors: Liu Feng Chen , Geng Lei
Published: May 2011

For mechanical reliability design with more random variable parameters, if the parameters are queued with their impact on the sensitivity of mechanical reliability, which will be as random variables with relatively high impact, while low-impact will be determined variables, thus would simplify reliability analysis due to the random variable number reduced. With cylindrical helical spring as an example, applying the variation coefficient method, the reliability sensitivity calculation of shear stress and deformation is discussed, and the impact on the reliability of cylindrical helical spring by changing the random variables is also studied. Using the variation coefficient method we can obtain the reliability sensitivity of cylindrical helical spring quickly and accurately, which provides a theoretical basis for the reliability design of cylindrical helical spring, and has greatly improved the reliability analysis efficiency of cylindrical helical spring.
The Effect of Interphase Modulus and Thickness on Stress Transfer of Short-Fiber-Reinforced Composites
Authors: Zhang Bin , Gu Bo Qin
Published: May 2011

In this paper, the stress distribution of short-fiber-reinforced composites (SFRC) using representative volume element (RVE) approach based on the finite element analysis (FEA) was presented. A three-phase model was built, in which loads were applied to the matrix. The influences of interphase parameters like Young’s modulus and thickness were studied. The FEA confirms that interphase Young’s modulus and thickness control stress distribution in SFRC. The stress concentration at the fiber interface becomes greater with high interphase Young’s modulus and thin interphase thickness. The FEA results were also compared with those obtained by analytic method.
A New Reduced-Reference Image Quality Assessment Method Based on SSIM
Authors: Huang Lian Fen , Cui Xiao Nan , Lin Jian An , Shi Zhi Yuan
Published: May 2011

Because human visual perception is highly adapted for extracting structural information from a scene, but the existing SSIM index is a full reference method which needs entire information of reference images. In this paper, we develop a reduced reference SSIM method and evaluate its performance through a set of assessment criteria, as well as comparison to both EPSNR and SSIM methods on a database of images compressed with JPEG and JPEG2000.
A Methodology of Data Translation for Collaborative Design
Authors: Hou Jun Ming , Yang De Xu , Wang Wan Shan
Published: May 2011

Collaborative design is a new method for mechanical design and manufacture, how to improve the ability of design is the point problem. Data translation is a key problem for collaborative e design. In the paper, the problem of data translation is solved. Different design software for designer can complete the same task, which is based on the data transition and translation. The XML style of data is established, which is applied to express the relationship of data. The XML to STEP style is presented for system. Data can be transmitted among different software. The integration of system is established. At last, a prototype system is presented to demonstrate the methodology.
Assignment Problem Based on Improved Ant Colony Algorithm
Authors: Gao Zhi’e , Zhang Gong Jing
Published: May 2011

Assignment problem is a combinatorial optimization problem.In this paper,a improved ant colony algorithm is proposed to solve the assignment problem.According to the rule of state-shift and strategty of updating pheromone, parameters of the ant colony Algorithm are optimized and changed,the best solution can be found rapidly,the simulative results show that the improvement strategies can well improve convergence speed and quality.
Blind Source Separation of Convolutive Mixtures by Using Time-Delayed Statistics and Exact Diagonalization
Authors: Yang Jie , Wang Zhen Li
Published: May 2011

The convolutive blind source separation (BSS) problem has been received much more attentions in recent years. This paper investigates a convolutive BSS algorithm via employing the time-delayed second-order statistics information and exact diagonalization without any a priori knowledge on the mixtures. This decorrelated second-order statistics and its multi-sample delayed copies, which form two positive-definite symmetry matrices, are obtained from whitened mixtures. By using a set of transforms such as Cholesky decomposition and singular value decomposition (SVD) to these two matrices, a unitary matrix is obtained and utilized to diagonalize them exactly. It attributes the estimates of source signals to this matrix. The similarity between the estimated and original signals is quantified by calculating their correlation coefficients (CC). For the mixtures of speech and noise, ItakuraSaito distance (ISD) is applied to measure the intelligibility of estimated speech signals. Better performance of the investigated algorithm is demonstrated in experimental results compared with the previous algorithm.
Loads Transfer in the Adhesively Bonded Patch
Authors: Her Shiuh Chuan , Sun Chien Hsien
Published: May 2011

The main objective of this research is to study the reinforcement role of the adhesively bonded patches in the structure. In order to evaluate the mechanical behaviour of the structure reinforced with external patches, a shear lag model was adopted to investigate the load transfer from the host structure to the adhesively bonded patches. Closed-form solutions of the shear stress in the adhesive and longitudinal forces in the reinforcement patch and host structure were obtained. The theoretical predictions were validated with the numerical analysis using the finite element method. The effect of the adhesive on the load transfer was presented through a parametric study.
Analysis of Urban Environment: Case Study of the Spatial Integration of Rwandan Cities
Authors: Mupenzi Jean de la Paix , Ge Ji Wen , Li Lan Hai , Habiyaremye Gabriel
Published: May 2011

This paper presents the results of the study undertaken in Rwanda to investigate the spatial integration of cities. It was revealed that the economic subordination degree appears to be very low because the economy of all cities in country depends on Kigali City, the capital of Rwanda that detains more than 70% of national economy.
Dielectric Tunability in Ferromagnetic-Ferroelectric Composite System
Authors: Zhou Yun , Ye You Xiang , Wu Liang Neng , Yu Sen Jiang
Published: May 2011

A new kind of lead-free ferromagnetic-ferroelectric (FM/FE) composite was successfully prepared by incorporating the dispersed 0.15Ni0.98Co0.02Fe2O4 (NCF) ferromagnetic nanoparticles into 0.85(K0.5Na0.5)NbO3-LiSbO3 (KNN-LS) ferroelectric micromatrix. The relative dielectric constant (εr) of the ceramic as a function of frequency (0.1 -200 kHz) under different dc bias electric field strengths was investigated in detail. εr increases with increasing dc bias electric field, while tanδ decreases with the increase in frequency. At room temperature, the high dielectric tunability (KD=11.41%) and high figure of merit (FOM=15.66) under the low dc electric field of 3 kV/cm, clearly imply that these ceramics are promising materials for tunable microwave device applications.