bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Pretension Loss of Cables Applied in Mine
Authors: Wu Jian Xing , Ren Shuo , Wang Zi Yue , Li Jian Zhong
Published: October 2014

Pretension is the critical factor for cable supporting, but phenomenon of pretension loss exists in engineering practices. Tests of pretension loss carried out in Luan Zhangcun Mine show that the length and diameter of cables, anchorage, and degree of tension, tensioning equipments, and other factors will affect pretension loss of cables; the appropriate solution to reduce pretension loss is proposed. Ultra-tensioning 25% can ensure that the pretension meets the design requirements.
Composite Damping Circular Saw Blade Vibration Characteristics Analysis
Authors: Zhang Ming Song , Zhu Pu Xian , Cheng Lian Bing
Published: October 2014

Applying the method of finite element to research the composite damping vibration reduction effect of circular saw blade. Based on the structure of composite damping circular saw blade, contrast a composite saw blade and ordinary saw blade, to design and compare their vibration characteristics. Through research the vibration characteristics on the three kinds of saw blades found that the each order natural frequency of composite damping saw blade and composite saw blade is smaller than the corresponding order natural frequency of ordinary saw blade, and the each order natural frequency of composite damping saw blade slightly smaller than the corresponding order natural frequency of composite saw blade; The maximum displacement deformation of composite damping saw blade and composite saw blade is smaller than the corresponding order of ordinary saw blade. Through study the damping characteristics found that the modal damping ratio of composite damping saw blade is greater than others; and research the dynamics characteristics found that composite damping blade's vibration attenuation faster than others, and it illustrate the good effect of damping saw blade.
A Low Noise Power Design for Electrical Impedance Tomography System
Authors: Guo Yan Yan , Chen Xiao Yan , Yang Yong Zheng
Published: October 2014

This paper describes a quality power module design for Biological Electrical Impedance Tomography (BEIT) system based on FPGA. As the electrical signals on the boundary of subject are too weak to measure effectively, it is essential to design a data acquisition system with high SNR and extremely low noise. This paper is focus on the power module design because the quality of the power module impacts the performance of the data acquisition system directly. The BEIT system needs several kinds of power supply to work effectively, such as 12V, 5V. In this paper, the power module is supplied by DC18V, using Buck-type DC/DC and LDO technologies, a set of independent power supply scheme is carried out, and provides stability and low noise power sources. The expected powers with ripple less than 20mV are achieved, which can preferably meet the BEIT system power supply requirements.
Inverse Identification of Nonlinear Boundary for a Pile Using Time Domain Multi-Point Approximations Method
Authors: Sun Yuan Gui , Sun Guo , Gao Yuan Jun
Published: October 2014

A inverse identification method is proposed to deal with the nonlinear boundary parameter identification problem. The boundary condition is modeled as unknown equivalent substructure applied on the initial linear structure and the parameter identification inverse problem is translated into a linear-model based equivalent force identification problem. Based on a given multi-point approximations method, the time history of the equivalent force is identified using the measured dynamic response. The unknown dynamic forces due to substructure are parameterized by combination the base functions on a series of space-time points. Using the moving least squares method, a matrix is derived to extract the force time history from the measured dynamic response. Then, the boundary stiffness and damping are identified using the input-output data of the equivalent substructure. The proposed approach has been demonstrated by some numerical examples and the boundary parameters are successfully identified.
Power System Fault Diagnosis Method Summary
Authors: Zhao Yu , Xiong Wei , Li Huang Qiang , Yang Shi Yong
Published: October 2014

Combined with the power system fault diagnosis current situation, fault diagnosis methods are important to shorten fault outage time, prevent accident expanding and restore power quickly. We summed up expert system, artificial neural network, Petri network and Bayesian network fault diagnosis methods. The diagnosis principle, advantages and disadvantages of different methods were discussed.
Random Sampling Approaches for Implementation of FPGA in Signal Processing
Authors: Li De Xin
Published: October 2014

Nowadays, digital front-end devices are widely used in large number of fields such as electronic appliances. Signals must be presented in an appropriate format, for example, the original analog signals must be converted into digital formats that can be recognized and used by digital equipment. In this paper, the random sampling technique is implemented by original design of a Pseudorandom Signal Sampler circuit for controlling ADC to relax constraints of receiver circuits supporting multiband signal processing. This new idea of using non-uniform sampling technique for multiband signals sampling allows the main advantage of suppressing spectral aliases at integer multiples of sampling frequency produced by conventional uniform sampling technique. This approach could reduce the constraints on the anti-aliasing filter, relax the automatic gain control dynamic range, and decrease the ADC dynamic power consumption. Experiments show that this approach achieve good performance and it could be implemented in FPGA in signal processing successfully.
Underdetermined Blind Separation for Bearings Faults Based on the Improved Morphological Filter
Authors: Jun Zhou , Xing Wu , Chi Yi  Lin , Nan Pan
Published: October 2014

Aiming at the condition of the strong background noise, many interference sources and unknown the number of sources in the actual industrial field, a method based on multi-scale multi-structure close-open average combination morphological filtering(C-OACMF) and sparse component analysis (SCA) was proposed to deal with the blind source separation problem of rotation machines. First, the C-OACMF was used to filter out background noise signals and extract the characteristic signal of observation signals, then using the simulated annealing genetic algorithm of fuzzy C-average clustering algorithm estimates the mixing matrix, the linear programming is finally used to estimate the source signals. Through the actual environment composite rolling bearing fault vibration signal extraction experiments verify the effectiveness and accuracy of the proposed algorithm.
Air Quality Condition Assessment Based on Point Check and Benchmark
Authors: Xia Yan Chun
Published: October 2014

The indoor air quality is very important at any workplace. The air quality accidents and problems are analyzed. Based on the air quality standard and benchmarks, the test and monitor data can be compared. So the air condition system operation status can be evaluated based on the data, the potential causes can be drawn, and the improvement actions and suggestions can be recommended in the paper.
Roundness Error Evaluation Based on Differential Evolution Algorithm
Authors: Jin Long , Chen Yue Ping , Lu Hai Yan , Li Shu Ping , Chen Yi
Published: October 2014

A new approach for roundness (circularity) error evaluation based on the differential evolution (DE) algorithm is proposed.The mathematical model of the roundness error under the condition of the minimum zone is derived. The background and advantages of DE are introduced, the fundamentals and implementation techniques are also given.The approach is verified by two examples.Compared with other methods, the results show that the proposed method makes the roundness error evaluation more accurate.
Control Method for Vehicles on Base of Natural Energy Recovery
Authors: Pshikhopov Viacheslav , Medvedev Mikhail , Gaiduk Anatoly
Published: October 2014

This paper is devoted to vehicle movement control method based on the natural energy recovery [1] and position-path control approach [2,3,4]. This method ensures the fullest use of kinematic energy of the controlled vehicle. Method is applied for path profile with variable height. Vehicle velocity is changed to minimize kinematic energy losses. The time of the path passage is accounted in the designed method. In this report typical profiles of the controlled vehicle are considered. In general case the vehicle velocity program is developed on base of solutions for typical profiles. The vehicle velocity program is changing while vehicle is moving. The developed method is applied for control of trains implemented with electrical power drives. On base of train model studying it is proved that optimal mode of trains acceleration is maximal traction. The maximal traction ensures minimum energy consumption of train drives. But the traction of trains is extreme function of the speed wheel slip [5, 6]. Therefore the new extreme control for the train drives is developed. This method supports trains traction in extreme value. The developed method is implemented in simulator based on Matlab and Universal Mechanism. Movement of a freight train on a real track section is simulated.
Output Switching Control of a Class of Time-Delay Fuzzy Systems
Authors: Yang Hong , Lü Huan Huan , Zhang Le
Published: October 2014

For a class of T-S fuzzy time-delay systems, the problem of designing a static output feedback controller is considered via the parallel distributed compensation (PDC) approach. Namely, when one controller can not assure the stability of system, a controller switching strategy in certain set of controllers may stabilize the system. Moreover the adoption of this strategy often improves the performance of system even in the case that a single controller can stabilize the system. By defining multiple Lyapunov functions, the sufficient condition for the existence of the static out put feedback controller is presented in terms of linear matrix inequality (LMI), which guarantees the stability of the close-loop system for the switching cases. The simulation results demonstrate the effectiveness of the proposed method.
A Tracked Robot for Complex Environment Detecting
Authors: Wu Fan , Liu Shi , Mu Wen Jing
Published: October 2014

The complex geographical environment put forward grand challenge to most current detecting robot on the problem of communication control and moving obstacle avoidance.This paper proposed a crawler robot for complex environment detecting.Information acquisition was achieved by Labview programming,the collected sensor information was debugged by fusing and displaying in the Labview interface , in order to realize the stability of the system.The positioning part adopted wireless location technology of ZigBee networks,which can support a large number of network nodes, fast, and reliable security etc.In addition, the upper part of the robot body was equipped with camera and mechanical arm to achieve target capture, carrying something and other tasks. According to the situation of accident, remote control terminal through wireless control function can control the further action of the robot. Through experimental tests, this paper proposes this kind of detection robot had great advantages in detection, search and rescue, it can complete the search under complex and dangerous environment.
The Construction of Biorthogonal High Dimensional Wavelet Packets
Authors: Yang Wei Qing
Published: October 2014

In this paper, the concept of biorthogonal nonseparable high dimensional wavelet packets which is the generalizaion of biorthogonal univariate wavelet packets is introduced. A new method for constructing them is presented by iteration method. The biorthogonality properties of high dimensional wavelet packets are discussed. Three biorthogonality formulas concerning these wavelet packets are estabished.
Design and Implementation of Network Leave Examination and Approval System Based on CRP Digital Campus Information Management Platform
Authors: Huang Bin Wen , Jiao Yuan
Published: October 2014

Aim at leave examination and approval requirements of digitization and networking, we use J.Office cooperative office platform as developing platform of design and implementation of network leave examination and approval system of CRP digital campus network information platform (CRP), we use leave examination and approval process of Hainan Vocational College of Political Science and Law as an example to give specific implementation steps and demo about network leave examination and approval system.
Effect of Fiber Orientation on Vibration Characteristic of Composite Laminated Plates
Authors: Peng Hui Fen , Wang Cheng , Wang Peng
Published: October 2014

To describe vibration characteristic of composite laminated plates with various fiber orientations, a composite laminated finite element, which follows classical lamination theory, was constructed. In each ply of rectangular composite laminated plates, the fiber orientation changes with respect to the horizontal coordinate. Natural frequencies and mode shapes of composite laminated plates were studied. The first six natural frequencies and mode shapes of composite laminated plates with various fiber orientations are obtained. The accuracy of this composite laminated element is verified by comparing numerical and theoretical results. The results show that the changes of fiber orientation bring a greater degree of flexibility for structure design of composite laminated plates, which can be used to adjust frequencies and mode shapes of composite laminated plates according to practical engineering need.
Applying Neuroscience to Tourism Management: A Primary Exploration of Neurotourism
Authors: Ma Qing Guo , Hu Lin Feng , Pei Guan Xiong , Ren Pei Yu , Ge Peng
Published: October 2014

Nowadays it is a heated interest to apply neuroscience knowledge to social sciences. Following the neuromanagement, neurotourism is coined and discussed by the authors. Neurotourism mainly explores the neural mechanism underlying tourists’ behaviors and aims to advance tourism research. Neuroscience tools can obtain objective neurophysiology data from human body, serving as potential measurements of some constructs such as happiness, tourism satisfaction and revisiting intention. Besides, neuroscience tools can also capture and record the cognitive and emotional process in real-time during tourism experience and this application helps the tourism manager achieve better monitoring and scheduling. Thus we suggest that neurophysiology data should be added to management information system. Finally a pilot event-related potential techniques (ERPs, one of the cognitive neuroscience tools) experiment was conducted to support our ideas.
A Comparative Study on Silica Sands as Absorbents for the Removal of Hexavalent Chromium Ions from Aqueous Solutions
Authors: Zhang Yun , Liu Shi Quan
Published: October 2014

Silica sand is the main material in glass production. It can also be used for water purification. In this work, two types of silica sand used for the glass production were directly applied in the removal of Cr6+ from aqueous solutions. The chemical composition, loss-on-ignition, acid solubility and surface area of the two sands are compared. The results indicate that both sands are quite similar in chemical and mineral compositions. However, sand B has a higher organic content, a smaller crystalline grain size, a larger surface area and acid solubility. As a result, sand B shows a larger absorption of Cr6+ than sand A. In addition, both sands exhibit declined absorption of Cr6+ with increasing the pH of the solution from 1 to 3. No absorption occurred when the pH was higher than 3.
Dyeing of Mulberry Silk Using Natural Safflower Yellow Pigment
Authors: Jia Yan Mei , Jiang Hong Wu
Published: October 2014

A natural yellow pigment is extracted from carthamus tinctorious and the stability of the pigment on metal ions and the pH change are studied by visible spectra analysis. The extracts are applied to dye silk fabric and the dyeing properties are tested. Results show that the maximum absorption wavelength of the extract changed with pH value and metal ions. The safflower yellow pigment has good property for silk dyeing, the mordant dyed silk fabrics can obtain a deeper color yield and a better washing and rubbing color fastness.
Microstructure and Corrosion Resistance of TiO2 Films on 316L Using Hydrothermal Method
Authors: Wang Jun , Huang Long
Published: October 2014

TiO2 films were prepared on glass and 316L stainless steel (316L SS) using hydrothermal method. The microstructures of the films were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It indicated that the films crystallized as anatase phase with mirror-like surface morphology. The optical properties of the TiO2 film were studied by Ultraviolet Visible Spectroscopy (UV-Vis). The results showed that the film was transparent in visible range. The cut-off point of the sample was red-shifted after annealed treatment. The corrosion resistance of the film was evaluated by using Tafel polarization curve in simulated body solution. The corrosion current density was decreased from 8.556 μA/cm2 (316L SS) to 1.421 μA/cm2 (TiO2 film/316L SS). While, the corrosion potential was increased from-0.402 V (316L SS) to-0.325 V (TiO2 film/316L SS). The 316L SS with TiO2 film has better corrosion resistance.
The Function of PEG in the Synthesis of Nanomaterials
Authors: Zhu Qi Wei , Ou Mei Gui
Published: October 2014

PEG (polyethylene glycol) have been widely used in the synthesis of nanomaterials due to its special structure and performance. In this paper, the role PEG played in the preparation of nanomaterials, such as dispersion and stabilization, structure-directing, modification and functionalization were summarized.
Study on Tension and Compression Ratio and Discount Ratio of Rubber Modified Silica Fume Concrete
Authors: Li Wei , Huang Zhen , Wang Xiao Chu , Zhang Jian Peng
Published: October 2014

This paper conducted all kinds of performance testing of different rubber particle size and different dosage of silica fume rubber modified cement concrete under the condition of 10% the silicon ash content, such as: analysis research of compressive strength, splitting tensile strength, flexural strength, and pull off the pressure ratio and pressure ratio. Experimental results show that silica fume can improve rubber concrete compressive strength, splitting, bending strength, the folding ratio, adding silica fume concrete fracture pressure ratio and compression ratio are improved; the silica fume can effectively improve large brittleness and lack toughness of concrete, and improve the compactness of concrete.
The Enhancement Effect of Hydrated Lime on Glassphalt Concrete
Authors: Liao Yi Ping , Wu Heng Shan , Yi Ling Zhi
Published: October 2014

Adding the glass will make the cohesion property of HMA (Hot Mix Asphalt) worse. we often improve the antistrip performance of conventional HMA by the means of adding hydrated lime. In this article, we compare the effect of two different patterns of adding hydrated lime. The test reveals that: replacing the mineral power with hydrated lime can improve the overall performance of mix; With respect to mixing the hydrated lime with asphalt in advance, the water stability of concrete increase more, if the mineral power is replaced by equivalent; Although it can’t do a favor to the mix’s low temperature performance, mixing the hydrated lime with asphalt in advance can significantly improve the high temperature performance, it can be used in high temperature region while it rains rarely.
Research on Mechanism of Concrete Creep
Authors: Liu Guo Jun
Published: October 2014

Under sustained loads with a fixed value, the deformation of concrete will continue to increase as time increases; this phenomenon is called creep of concrete. Currently, there are several theories to explain the phenomenon of concrete creep, viscoelasticity theory, seepage theory, viscous flow theory, plastic flow theory, micro-fractures theory and internal forces balance theory. Above models mostly studied linear creep of concrete under low stress status. This paper mainly research on concrete creep mechanism, and pointed out the advantages and limitations of the various theories, which has a guiding significance for theoretical research.
Comparison Research on Mechanical Properties of High Temperature Alloy after Laser Peened and Ultrasonically Peened
Authors: Shen Xiao Jun , Wang Cheng , Sun Dong , Lai Zhi Lin , Yao Dong Ye
Published: October 2014

For comparative study of the influence of laser shock peening and ultrasonic shot peening on the mechanical property of superalloy K403, untreated, ultrasonic shot peening with 850°C heat preservation, laser shock (heat preservation, Hp), the fatigue testing of samples under four states were conducted at room temperature, and the analysis of two techniques’ influence on the mechanical properties of K403 was done by hardness tester, profile tester, scanning electron microscopy (SEM). The results indicated that LSP with Hp, LSP, USP with Hp can improve the fatigue life of K403 respectively for 2.4, 2.25, 1.4 times more longer than untreated sample; the increase of micro-hardness gradient after LSP were smaller than after USP. The SEM studies showed that the γ' phase distortion was elongated and the plastic deformation of samples by LSP was larger than by USP.
About Application Prospectivity of Rocks with Different Geological and Morphological Features as Basic Raw Component for Free-Cement Binder Production
Authors: Pavlenko Natalia Viktorovna , Strokova Valeria Valerievna , Kapusta Mariana Nikolaevna , Netsvet Daria Dmitrievna
Published: October 2014

The opportunity of production of effective non-cement binders with using of different morphological and structural types of aluminosilicates and silicates is studied on the basis of data of phase and structural features of natural raw materials – perlite and quartz sand.
Flank Wear Mechanism of WC-5TiC-10Co Cemented Carbides Inserts when Machining HT250 Gray Cast Iron
Authors: Chen Jian , Gong Man Feng , Wu Shang Hua
Published: October 2014

WC–5TiC–10Co cemented carbides inserts were prepared and used for the cutting tool for HT250 gray cast iron. The objective was to investigate the wear mechanism when machining HT250 gray cast iron with WC–5TiC–10Co cemented carbides inserts. WC–10Co cemented carbides with the same sintering technology and grain size were prepared for comparison. wear mechanism was examined at the same cutting parameters. The cutting tests were performed at a speed of 120 m/min with feed rate of 0.2 mm/rev and a constant depth of cut of 0.2 mm under dry conditions. Tool wear mechanism is analyzed by SEM and EDS. Adhesive and built-up-edge were found to be the predominant tool wear for WC–5TiC–10Co cemented carbides inserts. However, Attrition was the main wear mechanisms observed in WC–10Co cutting tools. The results obtained indicated that WC–5TiC–10Co cutting tools performed better than WC–10Co cutting tools, in terms of tool wear with current parameters.
Performance of a Waterproof Glass-Ceramic Coating
Authors: Zhang Wei , Yang Tong , Liu Shi Quan
Published: October 2014

The surface of a porous silica ceramic substrate was coated with water impermeable lithium aluminosilicate glass-ceramic layer by sintering a slurry consisted of fine glass powder. The coating was 600~800 microns thick. It is demonstrated that the glass-ceramic coating consists of β-Li2Al2Si3O10 crystallites. The coated sample has an excellent water proof performance. After the coating, both the dielectric constant and loss increase. The coating protected the substrate from ablation under 1700°C.
Research on Surface Treatment Technologies of Ti6Al4V Alloys
Authors: Liu Yong , Yao Shi Wei , Ke Han Bing , Liu Zhou Yang
Published: October 2014

Experiments were preformed to investigate the effects of micro-arc oxidation coating technology, nitrification technology and plasma spray technology on Ti6Al4V alloy. The morphologies on both exterior and section of the processed surfaces were analyzed. Characteristics of treated layers like thickness, hardness, roughness and friction coefficient were also studied and compared. The results show that these technologies can improve the surface hardness and friction coefficient by different degree, but also will destroy the smoothness.
Comparative Numerical Simulation of Natural Convection in a Porous Horizontal Cylindrical Annulus
Authors: Belabid Jabrane , Cheddadi Abdelkhalek
Published: October 2014

This work presents a numerical study of the natural convection in a saturated porous medium bounded by two horizontal concentric cylinders. The governing equations (in the stream function and temperature formulation) were solved using the ADI (Alternating Direction Implicit) method and the Samarskii-Andreev scheme. A comparison between the two methods is conducted. In both cases, the results obtained for the heat transfer rate given by the Nusselt number are in a good agreement with the available published data.
Immersed Boundary Lattice Boltzmann Method to Simulate Fluid Flows with Flexible Boundaries
Authors: Chen Yong Guang , Wan Li
Published: October 2014

The immersed boundary method (IBM) for the simulation of the interaction between fluid and flexible boundaries in combination with the lattice Boltzmann method (LBM) is described. The LBM is used to compute the flow field, the interaction between fluid and flexible boundaries to be treated by the IBM. To analyze the key factors of combination method and implementation process. An example is presented to verify the efficiency and accuracy of the described algorithm. These will provide a base for large scale simulation involving flexible boundaries in the future.
Similar Constructive Method of Solution for the Nonlinear Percolation Model in Composite Reservoir
Authors: Zhang Feng Jiu , Bao Xi Tao , Li Shun Chu , Gui Dong Dong , Dong Xiao Xu
Published: October 2014

This paper presents a percolation model for the composite reservoir, in which quadratic-gradient effect, well-bore storage, effective radius and three types of outer boundary conditions: constant pressure boundary, closed boundary and infinity boundary are considered. With Laplace transformation, the percolation model was linearized by the substitution of variables and obtained a boundary value problem of the composite modified zero-order Bessel equation. Using the Similar Constructive Method this method, we can gain the distributions of dimensionless reservoir pressure for the composite reservoirs in Laplace space. The similar structures of the solutions are convenient for analyzing the influence of reservoir parameters on pressure and providing significant convenience to the programming of well-test analysis software.
Numerical Investigation on Resistance Reducing Effect by Mass Injection through Porous Wall
Authors: Zhao Yong , Wang Tian Lin
Published: October 2014

A numerical study of flow in two-dimensional turbulent boundary layer flow with mass injection through a porous wall is conducted by Reynolds averaged numerical simulation (RANS) in this paper. Numerical results with available experimental data show that Wilcox (2006) k-w turbulence model can give good prediction in this complex flow. The comparison between mass injection and no mass injection for the local frictional resistance coefficient are performed. Numerical investigation indicates that mass injection may reduce the resistance significantly, which is confirmed by comparison of velocity profiles qualitatively.
Predicting the Influence of Microporosity on the Mechanical Properties and Fracture Behavior of High-Pressure Die-Cast AM50 Magnesium Alloy
Authors: Sun X. , Cao Z.Y. , Liu H.F. , Jiang W. , Liu L.P.
Published: October 2014

In this paper, experimental and finite element modeling methods were adopted to investigate the effects of microporosity on the tensile properties and fracture behavior of high-pressure die-casting (HPDC) AM50 alloy. By specimen-to-specimen fractographic analysis, the variability in tensile properties could be quantitatively correlated with the areal fraction of the porosity presented in the corresponding fracture surfaces by using a simple power law equation. Numerical models of synthetic microstructures with different pore sizes, areal fractions of pores and pore distributions were established. Based on the experimental and numerical simulation results, it could be concluded that the fracture will initially occur in the region where has the highest intensity of equivalent stress field (i.e., contains the most highly localized cluster of pores and shrinkage), and then, fracture crack will fast propagate through the adjacent regions which have the relatively high intensity of stress field.
Research on Bus Coupler Charging Protection Problem
Authors: Lin Gui Hua , Wang Yu Ying , Wang Tao
Published: October 2014

According to the relay protection rules, 110kV bus and 220kV bus and above, should be installed special bus protection. This paper do a separate research on bus coupler charging protection from the aspects of bus protection principle and logic of action. It was pointed out that the necessity of blocking differential protection in the process of coupling charging and the new problem of blocking differential protection. This paper puts forward improved bus charging protection after research the processing methods of different relay protection manufacturers, and it improves the reliability of bus coupler charging protection
Study on System Loss in Distribution Network with DG
Authors: Meng Jia , Piao Zai Lin , Zhou Feng
Published: October 2014

The access of DG changes the operation and structure of traditional distribution network. This study mainly focused on controlling DG output current to reduce network loss of the system. Select a simple radial distribution system as example for theoretical analysis and derive the expressions of load current and node voltage. Assuming that there exists a real number k between DG output current and load. Then list the network loss and voltage deviation expressions. For the purpose of operation optimization, k can be determined by mathematical calculations. It proves that the method has a certain rationality to be effective in controlling network loss.
Optimal Distributed Generator Allocation in Active Distribution Network Considering Reconfiguration
Authors: Yang Yu De , Xie Hong Bo
Published: October 2014

For the structure of active distribution network can flexibly adjust, an optimal distributed generator allocation model considering reconfiguration is proposed. This model is implemented in the GAMS software and solved using SBB solver based on branch and bound method, due to it is a 0-1 nonlinear mixed integer programming. IEEE 33 standard example is used to simulate for this model. Results show that reconfiguration can increase the capacity of absorbing DG, providing thoughts and guidance for confirming the capacity of DG, and for planning and operation of active distribution network.
Study on Coordinated Control of Multi-Distribution Static Var Compensator
Authors: Zhang Ming Jiang , Zhang Xi Lin , Wang Zhen Hao , Wang Ling
Published: October 2014

DFACTS devices can synthetically manage power quality problems. As one of the most DFACTS devices, the coordinated control of multi-distribution static var compensator should be considered. Controllers are separately designed aiming at different functions, that means the controllers are isolated even contradictory. In allusion to the problem that the separately designed DFACTS controllers exist interactions, the paper turns the coordination of the DFACTS controller into multi-objective optimization problem, takes the single-load infinite-bus distribution system with two DSVC as the research object, using the Non-dominated Sorting Genetic Algorithm with elitism approach (NSGA-II) for DFACTS controller parameters optimization, and the simulation results show the effectiveness of the algorithm.
Performance Comparison of Typical Built-In UHF Sensors Used for GIS PD Detection
Authors: Jia Yong Yong , Yang Jing Gang , Rong Lin , Tao Feng Bo
Published: October 2014

The UHF method is one of the most important partial discharge (PD) detection means for GIS, while sensor technique is the key factor of the UHF method. In comparison with external sensors, built-in sensors can achieve higher sensitivity. In this paper, two parameters were quoted to evaluate the performance of the sensor, which are He and S11. He refers to the PD detection sensitivity of sensor; S11 refers to the impedance matching property of the sensor. The paper firstly designed a simulation model of sensor performance evaluation, and then studied the performance differences of four typically used or researched built-in UHF sensors (i.e., disc-type, dipole-type, spiral-type and logarithmic-type) by simulation tools of CST. The conclusions of the paper can provide a reference for performance evaluation and type selection of UHF built-in sensor. Keywords: Gas Insulated Switchgear (GIS), Partial Discharge (PD), UHF, Sensor, Sensitivity
CIM Extensions for the Distributed Energy Resources Integration
Authors: Lv Guang Xian , Lu Yi Ming , Liu Hai Tao , Yu Hui , Chen Yu , Zhang Xin Hui
Published: October 2014

The Common Information Model (CIM) is an abstract data model that can be used to represent the major objects in Distribution Management System (DMS) applications. Because the CIM doesn’t modeling the Distributed Energy Resources (DERs), it can’t meet the requirements of DER operation and management for DMS advanced applications. Based on the DMS function requirements and IEC61850 DER data modal, the article established the corresponding DER information models in CIM for DMS applications integration.
The Controller Parameters Optimization for Droop Controlled Distributed Generators in Microgrid
Authors: Li Zhong Wen , Zang Chuan Zhi , Zeng Peng , Yu Hai Bin , Li He Peng
Published: October 2014

Microgrids are attracting a great deal of attention as integrated renewable energy resource can benefit both the utility and the customers. The droop-control method is popular for the microgrid stable operation as it avoids circulating currents among the converters without using any critical communication between them. The distributed generators should have high speed to follow the reference given by the droop controller, otherwise the system will fluctuate and even black out. Renewable energy powered Distributed Generators (DGs) are mostly inverter-interfaced and controlled by PI controllers. The Particle Swarm Optimization (PSO) was used to optimize the PI parameters with the objective of high tracking speed of the Inverter-interfaced DGs. Simulation studies in Matlab demonstrate the effectiveness of the optimized control parameters.
Security and Stability Control System Testing Platform for Guangxi Region Power Grid on RTDS
Authors: Sun Z.Y. , Ding Tao , Liu M.S.
Published: October 2014

There is a need to build power grid on RTDS in order to testing performance of security and stability equipment (SASE). The paper divide a large-scale province power grid into four region grid with present RTDS hardware capacity in a view to include all stations installing SASE in a single region grid and disconnect lines as few as possible between adjacent region grids. The paper gives method of manually calculating and modeling node’s power balance, keys of building region grid and matters needing attention transforming parameter format from BPA to RTDS, and then simulating results show that steady state error of some variables are less than one percent, all less than 10 percent and transient characteristics help SASE to start-up to some extent.
New Method of Overhead Line Icing Online Monitoring
Authors: Zhou Hua Min , Wu Hao , Quan Yu Sheng , Wang Zi Jian
Published: October 2014

Present icing monitoring system mainly depends on detecting the meteorological parameters and dynamic characteristics of the structure of the overhead icing line. However, all these systems need additional equipments for data collection. This paper provides a new method based on voltage and current of both ends of the line and discriminates the icing region and its severity via the change of active power and reactive power. It requires the voltage and current serving as signal source which is provided by the data collecting device on the both ends of lines. In this way it can accomplish the Monitoring task of icing transmission.
Analysis on Power Grid Investment Base on Cointegration Theory and VAR Model
Authors: Deng Guo Jun , Mao Zhao Lei , Sun Ke , Zhou Hao , Zhang Tuo Ting
Published: October 2014

Based on the statistical data of US from the year 1977 to 2006, this paper examines the long-run equilibrium relationship and short-term fluctuations among power grid investment, economy and electricity consumption by employing the recently developed VAR model and cointegration theory. The results show that the electricity consumption has a positive effect on power grid investment while GDP has a negative impact. The development of electric power grid investment can be divided into three stages. To achieve the coordinate development of electricity and economy, the electric power industrial should develop in advance and try to be a new pillar industry.
Study on Dynamic Bayesian Game of Power Grid Crisis Management
Authors: Li Shi Hua
Published: October 2014

Power grid crisis happening at home and abroad warns the necessity of carry out power grid crisis management. Power-grid crisis management game is a zero sum game between power grid crisis manager and crisis event. Power-grid crisis game belongs to the “dynamic game of incomplete information”-“dynamic Bayesian game”. Dynamic Bayesian game process is just analogous to the process of crisis management of power grid, which fully demonstrates that the process of power-grid crisis management is a course of repeated game between crisis manager and power-crisis, also a constantly optimized process. This article mainly studies: the specific characteristics of dynamic Bayesian game of grid crisis management; the Dynamic game model of power grid crisis management; the calculation of refined Bayesian equilibrium principles.
Effects of Hydrothermal Pretreatment on the Content and Structure of Lignin Extracted from Corncob
Authors: Guo Xiao Ya , Zhang Li , Shu Si Tao , Hao Jin Yu
Published: October 2014

A systematic hydrothermal pretreatment of corncob has been conducted with an aim to trace the content and property of lignin during the pretreatment process. The result showed that the lowest content of lignin was obtained under the following condition: water-solid ratio is 3:1,180 °C for 90min with 0.4g auxiliary medium. TG and FTIR analysis has been conducted to investigate the thermal stability and structure of lignin, and the result indicated that hydrothermal pretreatment influenced the thermal stability and structure of lignin extracted from corncob.
The Tooth Profile Design and Examination of Circular-Arc Gear Pump
Authors: Zhou Yang , Hao Shuang Hui , Hao Ming Hui
Published: October 2014

This paper presents the circular-arc tooth profile that has no trapped-oil feature and flow fluctuations. The mathematical model of tooth profile and helical surface is obtained by gear engagement theory. The examination of helical surface is by coordinate measuring machining (CMM). The sections that perpendicular to the axis direction of gear are selected to obtain the trajectory of measuring ball by the starting points and end points of measuring ball. The examination process of CMM is simulated by Matlab in this paper.
Simulation Analysis on Dynamic Load of Air-Conditioning System of Ocean-Going Ship
Authors: Zhao Zhong Chao , Cheng Hua , Feng Wei Xian , Qin Bo Jin
Published: October 2014

In this paper, a dynamic load mathematic model for ship’s multifunctional cabins was developed using the “black box model” theory. The multifunctional cabins’ dynamic loads for a ship navigating in a typical Eurasian route were calculated through this mathematic model. The research results show that the air-conditioning load of cabins varies with navigation areas and sailing time significantly. Ventilation load accounts for 51.92% of the total load, while heat conduction and radiation load only account for 7.47% and 6.68%, respectively. For a same navigating area, the maximum load for different cabins is 2.648 times of the minimum load at the same time. In addition, the impact factors were analyzed by regression analysis method, and that the 91.72% of variation of the dynamic load results from the outside temperature changing
Analysis of Equilibrium and Carrying Capability of the Octahedral Truss Structure
Authors: Luo Ani , Kun Zhou , Song Jian Hua , Liu He Ping , Xiao Te , Kong Ling Ying
Published: October 2014

The truss structure has characteristics of small mass with high rigidity etc., so it is still practical in structures and researched by engineers and scientists. Here a truss structure with the paraboloid top surface is presented; several truss forms of the octahedral space units are connected into it. The equilibrium matrix is calculated by the force-density method. From the equilibrium matrix, number of the self-stress mode and number of the displacement mode of the structure is calculated. According to the obtained result, the structure is proved to be in equilibrium. Through the ANSYS software, the truss structure is researched for deformation under outer forces and it is proved that the structure has certain rigidity and withholding capacity.
Analysis of the Settlement in Rigid Pile Composite Foundation
Authors: Shan Ji Fei , Ge Xin Sheng
Published: October 2014

On the basis of rigid pile composite foundation mechanism, This paper makes assumptions and establishes settlement calculation models, then applies shear displacement method to solve interaction flexibility coefficient of the pile-soil system and raises a rigid pile settlement calculation method, considering the effect of cushion.By calculating a certain experiment, it was found that theoretical and measured values of the relative error is smaller ,which can provide a reference for settlement calculation of rigid pile composite foundation in engineering.
Experimental Study on Additives for the Reduction of Alkalinity for Ecological Concrete
Authors: Zhuang Yan , Wang Meng , Zheng Li Kun
Published: October 2014

Concrete has been one of the most widely used materials in Engineering, which also induced the problems of vegetation destruction, soil erosion, and even deterioration for ecosystems. The ecological concrete was proposed to reinforce the slope due to its characteristics of high strength and large porosity to ensure the growth of plants. However the high alkalinity for ordinary portland cement constrained the growth of plants. An experimental test including 15 groups of samples was carried out to evaluate the effects of materials including polycarboxylate superplasticizer, calcium carbonate, ammonium bicarbonate, potassium dihydrogen phosphate, silica fume, ferrous sulfate and calcium lignosulfonate on pH value for ecological concrete. Under the condition that the compressive strength and porosity meet the requirement of ecological concrete, two sets of additives were proposed, which are suitable for the slope with high strength and the slope with low alkalinity requirements respectively.
An Improved Trace Method for Moving Target under Occlusion
Authors: Dong Yu Bing , Cheng Guang Liang , Li Ming Jing
Published: October 2014

Occlusion is a difficult problem to be solved in the process of target tracking. In order to solve the problem of occlusion, a new tracking method combined with trajectory prediction and multi-block matching is presented and studied,and a mathematical model of trajectory prediction of moving target is established in polar coordinates and verified through some experiments. The experimental results show that the new tracking method can be better to trace and forecast the moving target under occlusion.
Decomposing Complete 3-Uniform Hypergraph into 5-Cycles
Authors: Li Guan Ru , Lei Yi Ming , Jirimutu
Published: October 2014

About the Katona-Kierstead definition of a Hamiltonian cycles in a uniform hypergraph, a decomposition of complete k-uniform hypergraph Kn(k) into Hamiltonian cycles studied by Bailey-Stevens and Meszka-Rosa. For n≡2,4,5 (mod 6), we design algorithm for decomposing the complete 3-uniform hypergraphs into Hamiltonian cycles by using the method of edge-partition. A decomposition of Kn(3) into 5-cycles has been presented for all admissible n≤17, and for all n=4m +1, m is a positive integer. In general, the existence of a decomposition into 5-cycles remains open. In this paper, we use the method of edge-partition and cycle sequence proposed by Jirimutu and Wang. We find a decomposition of K20(3) into 5-cycles.
Gait Analysis and Trajectory Planning for Lower Limb Rehabilitation Training
Authors: Cao Fu Cheng , Xing Xiao Xue
Published: October 2014

In order to achieve lower limb gait rehabilitation of patients, the normal walking gait trajectory was analyzed fully. According to the analysis results, a health hip and knee gait trajectory planning method was presented. The computer data analysis results show that the gait trajectory analytical expressions proposed can represent a normal gait accurately.
Modeling of Content-Aware Based on Multi-Sources Heterogeneous Data Sensed in the Internet of Things
Authors: Yu Bin Bin , Hu Liang
Published: October 2014

In wireless sensor networks, raw data is just collected and stored as binary value in the relation databases. In the Internet of Things (IoT), it requires machine to understand these multi-sources heterogeneous data’s meanings in specific environment and the interoperable service to share these with other different machines. In order to address these issues, construction of content-aware model based on multi-sources heterogeneous data is necessary to be proposed in the paper, we discussed the IoT theory, new features and problems of the IoT data and based on semantic technology, we put forward the method of content-aware construction based on multi-sources heterogeneous data sensed in the IoT and explained in detail all parts of it. Finally, an experimental simulation platform was given to demonstrate the feasibility and validity of this method.
Method of Fuzzy Modeling in Reliability Prediction Algorithm
Authors: Tian Hong Xun , Wu Wen Fu , Wang Peng , Li Hong Zhong
Published: October 2014

To introduce a kind of method of fuzzy modeling based on the accuracy of data sources and accessibility of the interface which can predict the future system reliability. Data sources are from Reliability management system, distribution network planning detail and projects of overhaul, capital construction, technical transformation, business expansion. There is little reports of the reliability evaluation algorithm by now. This paper is based on the correlation analysis method of load forecasting to forecast the reliability index.
Research on Integrals of the Second Category Curved Surface
Authors: Xu Xia , Wang Li Na
Published: October 2014

In this thesis,surface integrals and the relationship between characteristics of the second class and second class double integral surface integrals, analyzes the application of the law of symmetry integral calculation, even if the integration region derived symmetric integrand is an odd function integral value characteristic is not necessarily zero. And pointed out that the feasibility of the method is definitely second class surface integrals.