bluuebunny/crossref_metadata_2025 huggingface dataset:
Hemicelluloses Extraction of Bagasse and Bagasse Pith
Authors: Liu Yu Xin , Sun Bing , Chen Ke Li
Published: February 2012

In this paper, bagasse (de-pithed bagasse) and bagasse pith were treated respectively, the process of hemicelluloses extraction was optimized, and some parameters which may affect the hemicelluloses yield were discussed, such as alkali charge, temperature and time of extraction. The results showed that the hemicelluloses yield of bagasse was obviously affected by the alkali charge and temperature of extraction increasing at the same liquid-to-solid ratio and time, and the maximum reached 18.47% (base on o.d.) . To bagasse pith, it could obtain hemicelluloses of 15.37% by the same treatment with bagasse. Therefore, both bagasse and bagasse pith were the good materials for hemicelluloses extraction.
Preparation of Low Cost Ti-6Al-4V Alloy by Gelcasting
Authors: Ye Qing , Hao Jun Jie , Guo Zhi Meng , Ru Min Chao
Published: February 2012

Ti-6Al-4V alloy was prepared by gelcasting. Plasma rotating electrode and hydrogenation-dehydrogenation Ti-6Al-4V powders were mixed used to meet both high performance and low cost objectives. The morphological properties were investigated by SEM. The results showed that the gelcasting green body with mixed powders has advantages of high solids loading and excellent sinterability. After sintered at 1400°C for 2h, the relative density reached 98%. The bending strength and hardness were 313MPa and 49.8(HRC).
Modification of Aminosilicone Oil with Long Side-Chain and its Application on Fabric Finishing
Authors: Cai Lu , Li Zhan Xiong , Du Li Ping
Published: February 2012

In the current work, aminopropyl silicone oil was prepared by condensation reaction followed by chemical modification with high reactive carbon-17 mono-isocyanate. The stability of the emulsion of modified silicone oil was found to be excellent as compared with the untreated silicone oil. The modified silicone oil afforded better yellowing resistance, softness and laundry endurance, with stiffness change only 6.94% and handle retention rate 88.89% after ten launderings.
Multi-Level Block Information Extraction in Engineering Drawings Based on Depth-First Algorithm
Authors: Zhang Jia Yi , Zhao Long Fei , Hao Yong Ping
Published: February 2012

The problem of multi-level block reference is analyzed for the process of information extraction in engineering drawings. And the relationship of reference blocks has been established. By using depth-first algorithm, the multi-level reference path of blocks and the parameter transformation can be searched. Based on the algorithm, an arithmetic flow is proposed. And the method of coordinate transformation of reference blocks is expounded. The new method has important significance for comprehensiveness and accuracy of information automatic extraction of engineering drawings which contains multi-level reference blocks.
Modal Analysis of Flip Chip for Solder Bump Defect Detection
Authors: Liu Jun Chao , Shi Tie Lin , Wang Ke , Zeng Miao , Liao Guang Lan
Published: February 2012

Flip chip technology is one of the fastest growing segments of microelectronics packaging because of its ability to satisfy the increasing demands of high input/output density, package miniaturization, and reduced cost. A critical element in the successful application of flip chip technology is the reliability of solder bumps. In this paper, a nondestructive inspection method combining ultrasonic excitation with modal analysis is proposed for flip-chip solder bump defect detection. The signal generator and power amplifier are utilized to drive the capacitive air-coupled ultrasonic transducer to produce continuous ultrasonic waves for exciting the test chips. The vibration velocities of the chips are measured by the laser scanning vibrometer to extract the modal shapes and resonance frequencies. The results prove that the defective chips can be distinguished from the good chip by the modal shapes, and the resonance frequencies of the chips decrease with the increase of the open solder bumps. Therefore, this detection method may provide a new path for the improvement and innovation of flip chip on-line inspection systems.
Multi-Level Blended Learning Exploration and Practice on Experimental Teaching System
Authors: Yang Heng Fen , Zhao Ga , Wang Xiao Jun , Shu Ping Ping , Yang Jun
Published: February 2012

Student is the subject of the experimental teaching activities, cultivating the ability of independent study and technological innovation is the main aspect in experimental teaching reform. This paper analyzed the problems of traditional teaching model, explored and practiced the multilevel experimental teaching pattern which is based on the blended learning, it made the teachers fully play the leading role, and it fully reflected the subject status of students, it also roused the enthusiasm of students by the use of multi-platforms, media and environments. The multilevel experimental teaching pattern which is based on the blended learning can effectively cultivate the innovation ability of students, and it has achieved good results in practice.
Moisture Comfort Property of Fine Denier Polypropylene Fiber in Different Environmental Temperature Conditions
Authors: Yang Kai , Jiao Ming Li , Tu Hong Yan
Published: February 2012

Moisture handling property of clothes using fiber is an important factor determininig clothes comfort property. In this paper, the moisture comfort property of fine denier polypropylene fiber fabric in different environmental temperature conditions was studied. By Textile-Microclimate Measuring Instrument, five kinds of test fabrics' dynamic experiments were performed in four different environmental temperature conditions. And fabrics' dynamic comprehensive index was obtained to characterize fabrics' dynamic moisture comfort property. Then, grey system theory was introduced to establish models that could describe the relationship between the static parameters and the dynamic comprehensive index. Results show that the dynamic moisture comfort property of fine denier polypropylene fiber fabric is the best. And fabrics with lower thickness, lower weight, and higher vertical wicking height will be more moisture-comfortable.
Nano-AAO-Based Microsensor for Monitoring Process Carbon Monoxide
Authors: Chang Hsing Cheng , Hung San Shan , Lai Chi Chih , Chen Ya Hui , Chang I Nan , Lin Jung Chih , Liu Tze Chun
Published: February 2012

This study developed a porous nano anodic aluminum oxide (AAO) based gas microsensor for detecting process carbon monoxide (CO) at room temperature. The small sensing microdevice has stable response with high sensitivity which includes porous AAO structures, gas sensing membrane, interdigitated sensing electrode, heater and temperature sensor. The tungsten oxide (WO3) sensing membrane covers AAO to enlarge total gas sensing surface area to enhance gas sensing response. The Pt interdigitated sensing electrode can also improve the sensitivity. The experimental results showed that the CO gas concentration sensitivity is proportional to temperature. As compared with the sensor without AAO, the concentration range of CO sensed by this microsensor is 100~1000 ppm, the gas sensing resistance change rate can be increased by 87.4 %.
Modeling Method of Assembled Structure Coupling the Characteristics of the Joints
Authors: Guo Tie Neng , Yu Xue Li , Li Fu Ping , Cai Li Gang , Cui Ya Hui
Published: February 2012

Mechanical properties of the joints have impacted on the whole mechanical characteristics. Coupling the joint characteristics in the modeling of the machine tool is an important problem in machine mechanics analysis. In order to solve the joint modellings in the assembled structure, this paper presents a new method to creat beam elements between two symmetrical nodes on the contact surface of the joint. The stiffness and damping matrices of the elements are valuated according to the characteristics of the joint. To validate the accuracy of the proposed method, the modeling of an assembled structure with and without the joints is obtained and some corresponding experimental investigations are implemented. The error between the simulated and experimental results of the finite element model is less than 8.8%, while the error of the contact model often used in the existing literatures is one times bigger than the proposed model.
Theoretical Analysis and Experimental Research on Emergency Release Devices of Loading Arm
Authors: Wang Jie , Wang Ye Mu , Wang Qin Guo
Published: February 2012

This paper introduces the components and structure characteristics of Loading arms Emergency Release Device(ERD). It establishes mathematic model and carried on theory analysis and test analysis of the ERD. The theory analysis is identical with test results so that it can provide the theory basis for optimum design.
Using Multi-Buffer Mode to Improve Performance of Encryption Card
Authors: Zeng Rong , Zhang Tao , Lin Wei Min , Chen Ya Dong
Published: February 2012

This paper proposed a method to improve encryption card performance by multi-buffer mode. Compare original single-buffer mode, multi-buffer mode can reduce the time wasted that data transmission in PCI bus, can make encryption chip work at full capacity, can maximize the efficiency of encryption chip, and can improve performance of encryption card greatly. This paper also gives the scheduling algorithm to achieve multi-buffer mode. Finally, the result of comparing test proved that multi-buffer mode can indeed greatly improve the performance encryption card.
A Novel Force Sensor Based Multi-Function Take-Off Board
Authors: Chen Pei , Zhao Yu Long , Wang Bao Jin , Chen Shan Ping , Yan Zhen Long
Published: February 2012

In order to detect the take-off forces of athletes in long jump, a novel force sensor based take-off board is designed. The take-off board consists of a standard take-off board, two novel force sensors, two support plates and a base. The working mechanism of the strain beam in the force sensor is analyzed and the finite element method(FEM) is used to investigate the structural deformation and stress distribution. Then the sensor is tested. The calibration experimental results demonstrate that the sensor has an excellent measurement linearity (0.6%) and can meet the requirements of practical applications. Then the multi-function take-off board based on the force sensors is designed and manufactured which can make the daily long jump training more scientific.
Numerical Simulation Research on Vortex Characteristics of Centrifugal Pump Inlet Recirculation
Authors: Yuan Jian Ping , Sun Wei , Wang Long Yan , Liang Yun
Published: February 2012

The 3-D steady turbulent flow in a centrifugal pump under different conditions was simulated by ANSYS CFX software. The intensity, location and the morphology of the inlet recirculation vortex were analyzed using standard k-ε turbulent model through steady simulation. Based on the results, the turbulent flow in the impeller inlet was simulated by Large Eddy Simulation. The dynamic characters and the whole changing process of the recirculation vortex during the rotation of the impeller were analyzed. The results indicate that the critical flow rate of the recirculation onset is 0.7Qd. As the flow rate decreases, the size and the intensity of the recirculation vortex increase and the vortex partially block the flow passage. The vortex first appears in the passage which passes by the outlet section of the volute. During one rotating, the vortex undergoes a whole process of onset, developing, decreasing and disappearing. As the relative speed and the pressure gradient change under different conditions, the vortices present different morphologies.
Numerical Simulation of Gas Exchange Process in Two Stroke Reverse-Loop Scavenging Engines
Authors: Zhu Qing , Yuan Zhao Cheng , Guo Wen Cui , Yu Ying Xiao
Published: February 2012

For developing free-piston diesel engine, The two stroke Reverse-Loop scavenging diesel engine E150 was taken as the prototype and a simplified model was built by using CATIA software. Based on the influence of different factors about the gas exchange process，several layouts of scavenging air belt to be built in different schemes. Then the influence of the main structure parameters of scavenging air belt to the gas exchange process were analyzed and a better scheme of structural parameters was obtained.
The Research of Round Raster Readheads Scheme
Authors: Cong Jun Feng
Published: February 2012

The round raster is extensively applied in all kinds of high accuracy angular displacement measurement and control system.With the development of precise mechanotronics measuring instrument, machining center, CNC machine and various precise location testing technology, a higher request is put forward to the accuracy and the function of raster measurement system. In this article it is concluded that double readheads is the most reasonable configuration scheme through tests of single readhead scheme,two readheads and four readheads.
Control System Design of a Humanoid Robot Head
Authors: Guan Hao , Yan Xu Dong , Lan Jian
Published: February 2012

The steering engine is a import execute component in controlling of humanoid robot、manipulator and model aircraft . In this paper, with the single chip processor STC89C52 as the core, and adopting the timer interrupt through serial communication way of real-time control system to produce PWM waves. This method has low cost and simple hardware design, can achieve more independent PWM waveforms output.
Novel Acoustic Source Localization Method in WSN Based on LSSVR Regression Modeling
Authors: Zhang Xiao Ping , Wang Yang
Published: February 2012

To solve the problem of acoustic source localization in wireless sensor networks (WSN) under interference of environmental noise, a novel acoustic source localization method in WSN based on Least Square Support Vector Regression (LSSVR) modeling (ASL-LRM) was proposed. The ideal measured values of acoustic sensors were used to compose feature vector at first. Then LSSVR models were built by LSSVR modeling on the mapping relation between feature vector and acoustic source coordinate. The acoustic source was then located by inputting feature vector composed of real measured values of the sensors into LSSVR models. The modeling parameters optimization method based on localization effect in sample locations was also discussed. Experiments were performed in 100 test locations. RMSE values by ASL-LRM method in 72-76 test locations were less than MLE method and reduced by 60%-74% at most. In lower signal-to-noise ratio case, there were 87 test locations where RMSE values by ASL-LRM method were less than 2 meters, while there were only 12 test locations by MLE method. It shows ASL-LRM method achieves better localization effects in a large part of the region surrounded by sensor nodes. It especially has advantage on the occasions like lower signal-to-noise ratio or high precision localization.
Non-Oscillatory Solutions of Odd-Dimensional System of Functional Differential Equations
Authors: Yan Xin Zhou
Published: February 2012

In this paper, we consider the non-oscillatory problems of odd-dimensional system of linear delay functional differential equations. Based upon the corresponding characteristic equations, we get some criteria for non-oscillatory solutions by utilizing the matrix measures.
Study of Water Freezing and Thawing Process inside the PEMFC Stacks during Cold Start
Authors: Zhou Su , Zheng Lan , Chen Feng Xiang , Zhai Shuang
Published: February 2012

Cold start is a necessary function for PEMFC systems. In order to investigate the water freezing and thawing process inside PEMFC stack under subzero temperature, a 2-D transient model containing 40 cells has been developed. This model approximately estimates freezing and thawing time of each cell and shows the spatial distribution of water and ice for the purpose of analyzing the differences between single cells as well. As simulation examples, two processes under 260K ambient temperature have been studied in this paper and the results show as follows: (1)after the stack shut down, first of all, the outermost layer cell of the stack freezes before the inside cells and the freezing duration of each cells is almost the same, secondly, the freezing interval time of the outer cells is longer than the inside cells and the innermost cells almost freeze at the same time; (2) before the stack start up, heating up the membrane under two situations, one with the residual water inside and the other one has been purged after it shut down, the temperature rise of the stack with water is slower than that without water, this result indicates that the residual water would influence the cold start process.
Optimization Design of the Thread Joint in Gelin Column of Die Casting Machinery Based on FEM Analysis
Authors: Zheng Zhen Xing , Zhang Hua Wei , Wu Zhi Heng , Jing You Yan
Published: February 2012

The nonlinear contact mathematic model is constructed for the bolt joint structure on the fixed end of the Gelin column of die casting machinery and the FEM model and optimization mathematic model for the bolt joint structure are realized by software of ANSYS and the APDL language embedded in it. The structural parameters of different type of thread in Gelin column are optimized. After the comparison of equivalent contact stress in the region of the different type of the bolt joint in Gelin column, it is shown that there is more even load-bearing characteristics with the trapezoidal thread than zigzag thread and the maximum of the equivalent contact stress with the trapezoidal thread is decreased about 41% of that in zigzag thread which can effectively improve lifecycle and anti-fatigue performance of the threaded joint in the gelin column.
Coupling Model Analysis on Fluid Structure Interaction in Lifting Pipeling Based on ADINA
Authors: Wang Zhao , Zhou Zhi Jin , Lu Hao , Wen Ze Jun , Xia Yi Min
Published: February 2012

Using finite element software ADINA, three coupling models on fluid-structure interaction among internal fluid—pipe—external fluid in the lifting pipeline were researched. Firstly, coupling finite element model on fluid structure interaction of lifting pipeline was established and the first sixth order natural frequencies and principal vibration modes were attained at different ore conveying volume concentration and cross-section size of pipeline;Then natural frequencies of three couplings were compared with two couplings and no coupling according to the above condition, and FSI effect on natural frequency of pipeline was discussed. The calculation results were shown that the natural frequency of the pipe and its relative error reduced with the volume concentration and the relative wall thickness increased, which explain the reason that has better accuracy considering three couplings than other .These results have certain directive significance on the dynamic response, structure design and study of reduction vibration of lifting pipeline.
Study on Hydro-Geochemical Action during Seawater Intrusion
Authors: Ren Jia Guo , Wu Qian Qian , Han Zuo Zhen , Li Li , Wang Qi Fang
Published: February 2012

On the basis of hydrogeology investigation, the groundwater, river water, seawater and the medium in the lower reaches of the Dagu River were collected respectively, their compositions and nature were determined, then the permeability and the regularity of the main ions were determined during simulating seawater intrusion with transfusion installment. Finally, hydro-geochemical action was studied with the numerical simulation method during seawater intrusion. The result indicts that the mineral dissolution and precipitation take place with ion exchanges, Calcite is in a supersaturated situation after the percent of seawater reaches 40％; the saturation index of Gypsum arises gradually at first, and then decreases after the peak, finally it increases again but it is always in unsaturated condition from beginning to the end.
The Comprehensive Evaluation of UIG Regional Cooperative Innovation Effect Based on Sustainable Development
Authors: Guo Xiao Feng , Wu Zhi Gong , Li Yan
Published: February 2012

UIG regional cooperative innovation could integrate the resources of Universities, Enterprise and government, Complement each other, and achieve sustainable development. This paper analyses the effects of UIG regional cooperative innovation based on sustainable development, builds a comprehensive and integrated evaluation system, and evaluates the effects comprehensively by using rough sets theory and support vector machines method. The results show that, the mode of UIG cooperative innovation is suitable for China's current economic and social development, adapts to the need of national innovation system construction, and has a good development prospect.
Research on Modeling of Compressor Characteristics for Sichuan-East Gas Transmission Pipeline Project
Authors: Pu Hong Bin , Zheng Yun Ping , Wang Yu Chun , Cai Bai Song , Liu Qi
Published: February 2012

Optimized operation of compressor stations is of great importance for energy saving of Sichuan-East transmission pipeline at high flow rate. However, it is difficult to build an accurate mathematical model to describe the performance curves of centrifugal compressor due to the wide range of rotary speed. The achievements of this thesis are shown as follows. Firstly, the mathematic models for performance curves of the Euramerican centrifugal compressors were established. The optimized regression coefficients were solved rapidly and accurately by Zhan Chong-xi method. Secondly, the compressor ratio, polytropic efficiency, shaft power, outlet pressure, polytropic head and outlet temperature of centrifugal compressors at different flow rates and rotating speeds were calculated accurately. These results provides excellent modeling methods and reliable mathematics models of operating and managing compressor of Sichuan-East gas transmission pipeline. It was found that the lowest correlative index of six optimized models was 0.9772, and the maximum error is 4.2869%.
The Design of DDR-SDRAM Controller Based on Spartan3
Authors: Yan Lu , Feng An Song
Published: February 2012

The controller of DDR-SDRAM was designed with Spartan 3 of Xilinx.The design of the controller is made of the initialized program for power on and read/write control program.The design that uses state machine designing method was realized by VHDL language .The design was verified by software simulation of modelsim first,then it was verified by the PCB.The result of test indicates that the design of the controller for DDR-SDRAM met the demand of design and realized the control of the read/write DDR-SDRAM.
Study on Image Retrieval Method Based on Color and Location
Authors: Ji Lai Tang , Chen Tian Huang
Published: February 2012

In content-based image retrieval technology,color has been widely used as a kind of important image visual information.Compared with the geometrical character of image, color has certain stability and strong robustness to zoom, parallel move and rotate.Currently there are a lot of image retrieval technologies which own their own limitations.This paper puts forward an image retrieval method based on color and location,which is available for mobile platform.This paper adopts a histogram method in color characteristics and uses block color method to solve the color space distribution.Combined with the location-based service(LBS),this method can effectively improve the performance of image retrieval on the mobile platform.
Parametric Optimization of Micro Drilling Using Machine Vision Technique Combined with Taguchi Method
Authors: Liang Yu Teng , Chiou Yih Chih
Published: February 2012

The objective of this study is to optimize the micro drilling of PMMA (Polymethyl methacrylate) polymer with multiple performance characteristics. In Taguchi method, a three level orthogonal array has been used to determine the S/N ratio. Analysis of variance was used to determine the most significant process parameters affecting the holes roughness. Coated deposition, spindle speed and feed rate are optimized drilling parameters when the performance characteristics, which include tool life and surface roughness, are taken into consideration. The results indicated that the TiAlN-coating drills generate least wear and best holes quality. Finally, confirmation experiments were conducted to confirm the validity of the results.
Research on the Sports Development in China's Ethnic Minority Region
Authors: Li Xiao Jing
Published: February 2012

This article introduced the development of sports enterprise in China’s Ethnic Minority Region, summarized the significance of its development and analyzed the problems along its development, such as insufficient awareness of local government towards sports enterprise; still weak foundation of sports facilities; restriction to the further development due to its unique natural and geographical conditions and so on. It further put forward the developing strategies of succeeding the road of combining innovation and development, increasing investment constantly, accelerating the implementation of “Peasants Sports Fitness Project” and strengthening the development of minority sports resources to promote a better development of sports in minority nationality regions.
Outlier Detection for Soft-Sensor Modeling Data Based on k-Nearest Neighbor
Authors: Yang Qiang Da , Liu Zhen Quan
Published: February 2012

The on-line estimation of some key hard-to-measure process variables by using soft-sensor technique has received extensive concern in industrial production process. The precision of on-line estimation is closely related to the accuracy of soft-sensor model, while the accuracy of soft-sensor model depends strongly on the accuracy of modeling data. Aiming at the special character of the definition for outliers in soft-sensor modeling process, an outlier detection method based on k-nearest neighbor (k-NN) is proposed in this paper. The proposed method can be realized conveniently from data without priori knowledge and assumption of the process. The simulation result and practical application show that the proposed outlier detection method based on k-NN has good detection effect and high application value.
Performance Evaluation of the Upside Air-Supply Bottom-Side Air-Return Air Distribution Mode
Authors: Li Jiu Ru , Jia Shu Ling , Wang Yan , Kong Xiang Peng , Xu Ming Tao
Published: February 2012

It took the air-conditioned room as a object of study, and established indoor air flow three-dimensional physical and mathematical models on the basis of the two-equation turbulence model and wall-function. By the numerical simulation of two different forms of upside air-supply bottom-side air-return air distribution modes, indoor air temperature field, velocity field and molecular trace field were obtained, whereby we evaluated the ventilation characteristics of the two kinds of air distribution modes.
Study on Rockmass Deterioration Model Based on the Unified Strength Theory
Authors: Zhang Xue Ying
Published: February 2012

Strain softening model;Unified strength theory;Rockmass deterioration model;FLAC3D Abstract:Aiming at the problem that traditional elasto-plastic constitutive models have not been successful in predicting the depth and extent of brittle failed of hard rocks under high geo-stress condition, a new rockmass deterioration model(RDM) based on the unified strength theory is put forward in the basis of strain softening model and cohesion weaking and friction strengthening (CWFS)model. In the new model, the influence of intermediatemain stress to characteristic of rockmechanics is considered. Based on the method of lagrangian finite difference, a finite difference format of unified strain- softening elastoplastic model with strength parameters of c and φ is established. The constitutive unified elastoplastic model is imported into FLAC3D using a dynamic-link library file developed by VC++.Based on the new model, the traditional triaxial tests (with different confining pressure) and true triaxial tests (with intermediate principal stress ratio) are simulated in FLAC3D, and the measured data are compared with the results that are are simulated by strain softening model and CWFS model. The analytic results suggest that the rockmass deterioration model based on the twin shear unified strength theory has more strong applicability
Parse Mechanism of Manufacturing Information Needs Based on Workflow Context
Authors: Du Lei
Published: February 2012

In this paper, the definitions of workflow context and its formal description for manufacturing information based on RDF/S (Resource Description Framework/Schema) are studied. And then, the logical structure and structure storeage of the independent context space are built. On the basis above, the parse mechanism of the information needs and the search mechanism of manufacturing information are studied. The algorithms of semantic search and user requirement extraction based on workflow context are developed.
The Research of Dalvik Virtual Machine on the Andriod Platform
Authors: Li Ting Shun , Jing Shu Gang , Xu Jiao Hui , Cheng Yong Qiang
Published: February 2012

Android is a software platform used for mobile collection, which includes operating system, middleware and key applications. The paper describes the differences between Android and Dalvik, the main features of Andriod, the compare of Dalvik and JVM. For the mobile platform, Android becomes the most popular mobile platform operating system because of more optimization.
Performance Optimization Based on Genetic Algorithm of Double Suction Centrifugal Pump
Authors: Zhou Jian Song , Zhang Shu Jia , Mao Peng Zhan
Published: February 2012

The object is based on 150S-50 double suction centrifugal pump. At first establish the objective function which is based on the smallest hydraulic losses using the loss extremum method, and build constraint relationship between the parameters of impeller using geometry relationship. In order to get the geometric parameters, it is important to go for optimal calculation for the function using the software called matlab which is based on genetic algorithm. At last modeling, solving the internal flow field and comparing with the previous performance. The result shows that the pump hydraulic efficiency has increased by 0.7% under the normal conditions.
Temporary Supporting Role of Micro Steel Pipe Piles in Landslide Emergency Treatment
Authors: Xiao Jin
Published: February 2012

Landslide emergency treatment refers to the engineering technology which makes the landslide deformation under control by taking effective mechanical control measure before sliding. Landslides extensively exist in southwestern China, which represent a direct threat not only to the safety of people and facilities in the landslide front areas, but also to that of the major facilities or houses in the slope or the trailing edge areas. While the landslide now has been in the limit equilibrium state, which is very sensitive to external factors; mechanical control measures, such as earth-retaining walls and anti-slide piles, with the disadvantages of mass excavation volume, low construction speed and great interference to the slope, is not conducive to seize the preemptive opportunities of landslide emergency management, to protect the stable and keep the landslide from sliding and temporality protect the major facilities or houses. Hence micro steel pipe pile may after all be accepted as a productive mechanical control measure to, which is simple and easy to carry out and economic and reliable. Taking the example of Wenjialiang landslide emergency repair, this paper studies the important role of micro steel pipe pile in the landslide emergency treatment.
Two-Stage Evaluation of Life Insurance Industry in Taiwan Using Data Envelopment Analysis
Authors: Lin Hsien Ta
Published: February 2012

This study sourced the 2010 data of 25 Taiwanese life insurance companies, and conducted data envelopment analysis (DEA) to evaluate their operating efficiencies. The results can provide references for insurance companies and relevant institutions. The findings showed that there are nine DMUs with an overall efficiency of 1 under DEA at the single stage. Under DEA production efficiency evaluation, there are 15 DMUs with an overall efficiency of 1. Under second stage investment efficiency evaluation, there are 8 DMUs with an overall efficiency of 1. The management matrix diagram classifies 25 life insurance companies into four types, and suggestions are provided for each type of companies for improvements. The evaluation model of two-stage DEA can help measure operational performance and determine the different operations of each stage. The findings indicated that most companies are high product efficiency and low profit or lower product efficiency and profit than other insurance companies. The result can serve as decision references for relevant supervisory authorizes and investors, and in particular, provide reference indicators for life insurance companies, or the supervisory could modify relevant law under not affecting inventors’ benefits.
Study on City Hydrology Ecosystem System Influence Suffered from the Urbanization
Authors: Hu Yuan Dong , Wu Yan , Da Liang Jun
Published: February 2012

In this paper, it probes into the basic characteristics of the relationship between water and city persons, aims at the widespread existing hydrology and ecosystem problems in urbanized regions and the city residents’ environmental protection concepts. Finally, it calls on to control the city hydrology ecosystem system, achieve the sustainable development of socio-economic and water resource, create more fine living space for the city residents.
Properties for Solutions of Differential Equations with Variable Delay on Time Scales
Authors: Yan Xin Zhou
Published: February 2012

In this paper, we consider properties for solutions of the differential equations with variable delay on time scales, and obtain some sufficient conditions for properties of solutions.
Punching Process and Technical Equipment of High-Density Sub-Mesh Plate
Authors: Cheng Jun Hong , Liang Mu , Liang Dong Kai
Published: February 2012

According to the problems in the process of high-density mesh plate that mesh holes of plate is too density and the device screw bar is not long enough for the original equipment, a set process is used to overcome the problems of lying out and fixing for punchers. A simple special tool is designed. Fixed and slide ruler mechanisms are installed in the original machine. Repeat-orientation and several division methods are used, and the stroke of the original machine is increased two times, which successfully solves the processing problems and creates good economic benefits.
A Simple Method to Detect the Initial Position for Sensorless SRM
Authors: He Lin , Sun He Xu , Gao Jie , Bai Jie
Published: February 2012

The initial rotor position of SRM is the key to achieve no-reversing starter. There are some methods to detect the initial position of sensorless SRM. For example, phase current method, phase inductance method, test coil method and so on. In this paper we researched the relationship between the mutual inductance and rotor’s position in SRM. A new initial position detection method of sensor less SRM, which add a excitation pulse with a small value to the stator windings , then detect the value of the mutual inductance voltage of the two adjacent phase to determine the initial position of the rotor is given by this paper. And we designed the hardware to achieve this method. The feasibility and reliability of the method is proved by experiment of 8/6 pole four-phase switched reluctance motor.
Registration Algorithm of Time and Sensor System Errors for Multi-Platform
Authors: Zhang Pi Xu , Wang Hang Yu , Shi Zhang Song
Published: February 2012

Aiming at time and sensor system errors which are influential on detecting precision of sensors, the transfer relation of time and sensor system errors is modeled and a least square estimation algorithm is presented, based on navigation data with high precision and real-time observation of an aerial platform. Contrast among true value, observation and registered value by simulations show that the registration algorithm of time and sensor system errors for multi-platform can converge quickly with high precision.
Research of Flash Automatic Marking Based on Logical Formal
Authors: Zheng Wei , Wu Ya Ping , Chen Yao Fei
Published: February 2012

The author proposes a scheme of flash automatic marking based on animation effects. Describe the question's marking information by using the logical formal method. Achieve automatic marking by building the logical formal system. Focuses on two components of the scheme: logical formal description and SWF to XML. Describes the whole process of logical formal marking with example. Analysis of manual and automatic marking shows that: logical Formal automatic marking error is better than the manual average error.
The Research of Wireless Low Power Transmission System Based on Magnetic Resonant Coupling
Authors: Li Wei Xin , Zhang He
Published: February 2012

In order to study on the relationship between transmission parameters and transmission performance of wireless power transmission system based on the basic principles of magnetic resonant coupling, because of magnetic induction coupling with low-efficiency and short-distance, the basic circuit model of wireless power transmission system via Strongly Coupled Magnetic Resonances was analyzed. The expression of the parameters such as relationships between efficiency, frequency and distance was derived. Further more, the experiment of wireless power transmission system was designed based on the results of the analysis. At last, the results of experiment show that the theoretical derivation is correct and all the system is affected by the transmission parameters.
Research and Application of Full-Length Grouted Anchor in Roadway under Mining Face
Authors: Zang Chuan Wei , Ma Chuan Le , Zhuang Xue An
Published: February 2012

According to the difficult support problems of the roadway under the coal face on Dongtan Mine in China, a new reinforcing method using full-length grouted anchor is put forward. The strengthening principles are analyzed firstly, and the designing parameters are determined. At last the field construction is done in the north crosscut. The results show that the deformation is small and the roadway becomes stable. The good technical and economic results are obtained by the actual application.
Research of Information Extraction from SQL Server Based on SQL-DMO
Authors: Zheng Wei , Wu Ya Ping , Chen Yao Fei
Published: February 2012

This article describes the SQL Server object model SQL-DMO. Through the object model all information of SQL Server's internal objects can be obtained, including databases, data tables, stored procedures and triggers and so on. Analysis the method of the object’s information extraction. Get the child object by analyzing the parent object’s collection property and get internal information by analyzing the object’s properties. A visual basic procedure is designed to achieve the table’s structure information for all user tables in specified SQL Server database. This method is more complete and simple than the method based on system table.
The Application of Image Security to Electronic Commerce
Authors: Chen Yu
Published: February 2012

Information security in Electronic commerce is a very important, and image is one of the important information. Classic image encryption algorithms include Arnold cat transformation, magic square transformation, Hilbert transformation, and the Arnold cat transformation is widely applied and has the best scrambling effect effectively. It puts forward an algorithm of image encryption based on Arnold cat and chaotic map. The experiment results show that the key quantities and scrambling effect are improved obviously, and it is rapid and security.
Research of High Voltage Transmission Line Monitoring System Based on GPRS and ZIGBEE
Authors: Zhang Shu E , Wang Hao
Published: February 2012

The uncertainty of the geographical environment and climate in the power transmission lines leading to the safe operation of the power grid lines become an important indicator of reliability. Transmission line monitoring system monitors transmission line mechanical parameters and meteorological data in the operation. In order to realizing monitoring, prediction and positioning accurately in typical faults, ZIGBEE and GPRS are adopted to transmit mechanical parameters and meteorological data in monitoring system.
Research on Development Strategy of Sustainable Utilization of Water Resources in Northwest Hebei – Development Strategy of Sustainable Utilization of Water Resources and Vegetable Industry
Authors: Liu Shou Yi , Wei Dong Ling , Liu Jia Jun
Published: February 2012

[Objective] By understanding the past and present development of water resources and development advantages of vegetable industry in Northwest Hebei, as well as exacerbated desertification caused by the conflict between water shortage and vegetable industry development conflicts. We recommend the development of sustainable utilization of water resources available for the vegetable industry sustainable development strategy. [Methods] Methods are taken as a combination of scientific research based on field surveys, questionnaires and statistical analysis, theory and practical testing. [Results] Northwest Hebei water resources development has gone from earth-rock wells and small-scale channels of human excavation, excavation of manual work and machinery to the rapid growth of vegetable irrigable land. As a consequence of insufficiency of average annual rainfall in the region and the limited capacity of the groundwater recharge, water shortage has become a bottleneck element as a constraint to the development of vegetable industry. The conflict between water shortage and vegetable industry has intensified desertification. [Conclusion] The vegetable industry development should base itself on the carrying capacity of water resources as a priority. Sustainable utilization of water resources and scientific development can ensure and promote the sustainable development of vegetable industry.
Analysis on Controlling Oil Pressure Regulating Performance of Hydro-Viscous Variable Speed Clutch
Authors: Jiang Xue , Bao Ji Hua , Li Jin Liang , Hao Ni Ni
Published: February 2012

Hydro-viscous variable speed clutch has been widely used in starting and speed regulation of large load. In order to change the friction disc gap and the oil film thickness, converter was adopted in this paper to drive the pump to adjust the controlling oil pressure. The performance of pressure regulating of the controlling oil was analyzed and the characteristic curve of frequency-oil pressure could be acquired. The research showed that the controlling oil pressure can be changed by adjusting the frequency of converter. Besides, the slope coefficient and starting frequency of performance curve will be influenced by the leakage of hydro-viscous variable speed clutch and pump, the resistance of oil filter and the throttle valve opening degree.
Research on Automatic Balance Control of Self-Elevating Offshore Wind Turbine Installation Vessel
Authors: Wang Ling Ling , Tang Wen Xian , Qi Ji Yang , Ma Bao , Cai Yun Di
Published: February 2012

Automatic balance control in the jacking process of the self-elevating offshore wind turbine installation vessel is the guarantee of the vessel’s safe operations. The automatic balance method in the movement of the wind turbine installation vessel is analyzed, and a leveling scheme by the proportion reversing valves as the actuator is proposed. Then, the leveling principle of heavy platform is studied; an automatic balance strategy which is the combination of displacement leveling strategy and angle leveling strategy is given. Also, an automatic balance control system of wind turbine installation vessel which is based on PLC and PROFIBUS-DP fieldbus is established. PLC is as the main controller. Fieldbus adopted to realize data transmission between master and slave. And the balance procedure based on PID is designed. The research shows that the control system has good control effect such as fast response, high precision and good stability.
The Method of Character Recognition Based on Projection Transformation Combined with LS-SVM
Authors: Li Guo Ping , Yan Zhao
Published: February 2012

A method of character feature extraction based on circular projection transformation is proposed. First, it transforms the Cartesian coordinates into polar coordinates using the centroid of character image as the pole. It makes circular projection calculation and generates character feature vector by transforming 2-D character image into 1-D projection curves. Based on circular projection transformation feature extraction, the least squares support vector machine (LS-SVM) is introduced into the small character set embossed concave-convex character recognition.It adopted LS-SVM training software in the experiment for the simulation of embossed concave-convex characters’ number set. It studied on the effect of different core function and multi-classifier method, and compared with the results of neural networks, pattern matching and other identification classification methods.The experiment results show that the character feature has the scale and rotation invariance by the method of circular projection transformation extraction. Which combined with LS-SVM method has high recognition rate and more practicability in recognition small character set .
The Exploratory Study and Research in Network Environment
Authors: Wang Feng Li , Liu Jia Jun , Peng Fang
Published: February 2012

[Objective] This paper investigates the characteristics of the network environment and the impact on inquiry-based learning and it explores the inquiry learning research, development, content and theoretical basis. [Processes and Methods] The process and methods of experimental control, theoretical studies and system testing ways are applied. [Results] The network environment for inquiry-based learning provides more open space and self-learning environment, providing adequate sources of evidence and a wealth of interactive tools to promote inquiry-based learning and more efficient. “Inquiry learning” is the social development and it emerged with information technology network, the need to generate creative personnel training. The question, exploring and knowledge are the main elements, the learner's thinking on the scientific study and research methods. The theory stems from constructivist learning theory. [Conclusion] “Inquiry learning” is based on students’ knowledge construction, the formation of scientific concepts, scientific method and scientists to comprehend the course of study or activities similar understanding of the formation of a progressive course of communication activities, new course format. Its application for the cultivation of innovative talents is of great significance.
Research on Loss and Temperature Rise of a Novel Dynamic Electromagnetic Induction Heater
Authors: Du Hai , Qu Yan Bin
Published: February 2012

A novel dynamic electromagnetic induction heater for water treatment system is introduced in this paper, and its structure and operation mechanism is given. The heater converts input mechanical energy into various forms of heat energy completely, including the hyseresis loss, eddy current loss, copper loss and so on, and the mathematical model of loss is established based on fundamental electromagnetic field theory. By the finite element analysis, the above three kinds of loss are calculated at different rotation speed, as well as each of the percentage of total loss. At last, the temperature field and heat flux distribution of heater are calculated.