bluuebunny/crossref_metadata_2025 huggingface dataset:
Sustainability Indicators for Concrete Formwork System
Authors: Taher Ahmed Mohammed , Zakaria Rozana , Mohamad Zin Rosli , Hussien Ahmed Rania
Published: February 2014

As the premier construction material across the world, concrete has a major determining role on the effects, good or bad, of construction on the environment, meanwhile the formwork system is one of the important construction methods in building construction, which eventually will lead to more sustainable construction. This study is about the sustainability elements that respond to formwork system and their contribution to the main factors of sustainability using questionnaire survey distributed among construction experts. The economic factor had the most contribution to sustainability performance of formwork system; the environmental factors come second and at final come the social factors. Furthermore, the economic factor had seven elements effect formwork system performance and the environmental factor include six elements while social factor had only three elements.
Development of the Hexagonal Structure in the Processes of Improving Vibration Insulating Properties of Products
Authors: Cekan Pavol , Balog Karol , Kuracina Richard , Szabova Zuzana , Harangozó Jozef
Published: February 2014

This paper deals with noise and mechanical vibration reduction by optimization and proper application of the hexagonal cell structure formed on the surface of oscillating bodies. This structure can be applied in a broad spectrum of products like home appliances, industrial machines and devices, drives etc. It stems from the knowledge of the area of human health protection against the negative effects of noise and vibrations as well as psychological comfort, performance and optimization of psychoacoustic perceptions. The authors present the design of a suitable parametric model which makes it possible to change the basic structure parameters and by means of numerical simulations approach the achievement of optimal structure parameters.
The Critical State Constitutive Model and Strain Localization for Hostun Sand
Authors: Hu Ping , Huang Mao Song , Wu Deng Gao
Published: February 2014

Aiming at the limitation of traditional constitutive theories which can not explain the decrease of inclination angle of shear bands correctly when confining pressure increases, a state-dependent critical state model is employed to analyze strain localization of Hostun sands. Firstly, the critical state formulation and model parameters are calibrated through available drained triaxial test results of Hostun sand. Then an analysis of strain localization is performed on the drained plane strain tests. The results show that the state-dependent critical state model is capable of simulating the effect of initial effective confining pressure on inclination angle of shear bands.
Welding Process Optimization for Orthotropic Compound Bridge Plates
Authors: Li Yong Zhi , Yu Fu Yi
Published: February 2014

Compound plates of stainless steel is used to weld under construction in the Southern links railway bridge for the first time in China, but there occurs weld warpage of the convex parts and roughness appears excessive on the overall composite plate and severe deformation in the early phase of construction and the quality of railway bridge is affected seriously. Reasons of the impacting weld quality are analyzed and specific measures are proposed, and the construction program is optimized,too. A good foundation for the compound plate welding is layed and the efficiency and quality of welding can be improved .All of these will be contribute to ensure the overall quality of the welding quality of railway bridge.
The Influence of Alcohol Amine Admixtures on the Macroscopic Properties of Portland Cement Paste
Authors: Huang Tian Yong , Wang Dong Min , Liu Ze
Published: February 2014

It is studied the influence of triethanolamine (TEA), diethylenetriamine (DEA), Triisopropanolamine (TIPA), aminoethyl ethanolamine (AE), and polyvinyl alcohol ammonium phosphate (PAAP) at different dosages on the properties of fresh and hardened cement pastes and mortars prepared by Portland cement, including standard consistency water, setting time, the cement paste fluidity, and compressive and flexural strength. It is showed that the high polarity alcohol amine molecules exhibit strong chemical interactions with cement matrix, which are reflected in modified macroscopic properties of the cement system. All alcohol amine admixtures increased the standard consistency water and decreased cement paste fluidity of Portland cement. TEA significantly shortened the initial setting time and final setting time of Portland cement. On the other hand, TIPA, DEA, AE and PAAP extended the initial setting time of cement but shortened the cement final setting time. All alcohol amine admixtures except TIPA at 0.2 and 0.5 dosage increased the compressive and flexural strength of the Portland cement mortars at 3 days. Especially when the dosage of PAAP is 1, the compressive strength of the Portland cement mortars at 3 days is increased 10.5MPa. All alcohol amine admixtures except AE at 0.2 and 0.5 dosage increase the compressive and flexural strength of the Portland cement mortars at 28 days, Especially when the dosage of TIPA is 1, the compressive strength of the Portland cement mortars at 28 days is increased 8.8MPa.
Research on Ratio Selection of Mixed LiBr-CaCl2 Solution for Liquid Desiccant Cooling System
Authors: Zhao Xiao , Li Xiu Wei , Wang Fang
Published: February 2014

In recent years, liquid desiccant cooling system has shown its potential research value for its low-grade heat using and energy-saving. Thermal properties of liquid desiccant, especially its vapor pressure greatly affects the dehumidification efficiency of this system. Here comes the problem to find a liquid desiccant with better dehumidification effect and lower cost. To solve this problem, a local composition model: nonrandom two-liquid (NRTL) theory could be used to calculate a mixed solution of LiBr-CaCl2, and calculates the ideal mixing ratio of this solution in a working environment. The best mixing ratio with cost-effectiveness can be worked out by taking into account the initial cost of the solution. Study shows that: compared to single LiBr solution, the dehumidification effect could be raised by more than 8.2% and the costs could be reduced by 20% with mixed LiBr-CaCl2 solution.
Study on Characteristics of Ultrasonic Descaling and Heat Transfer Enhancement in Sewage Source Heat Pump System
Authors: Qian Jian Feng , Liu Ya Yuan , Xu Ying , Tan Yan Kun
Published: February 2014

sewage heat exchanger is important to collect heat energy in sewage source heat pump system. Heat transfer enhancement effect is not obvious while the chemical methods and manual cleaning is applying to remove the heat exchangers fouling in the long-term operation. Here sets an ultrasonic incrustation removal physical model in heat exchanger structure to antiscaling and descaling simultaneously. The acoustic cavitation technology can be used in sewage source heat pump systems for the experimental results and decontamination rate reaches 50%.
Simulating Design of Central Air Conditioning Control System in Office Buildings Based on PLC
Authors: Sun Xue Jing
Published: February 2014

In this paper, based on the Siemens S7-200 programmable controller in the central air conditioning control system, hardware and software of the central air-conditioning control system is designed. In hardware design PLC controller is used as controlling core to control temperature and humidity of the entire process. In the software design, control programming and multi-loop control of temperature, humidity PID algorithm are completed by using PLC programming software STEP7 because of its characteristics that it is easy to read and easy to achieve complete control. Lastly, Related parameter is set and the information is displayed by touching screen.
Energy-Saving Analysis of Reversible Ventilation System
Authors: Ren Yong , Mu Zhen Ying , Zheng Hong Tao , Chen Shi , Peng Li Jun
Published: February 2014

A new IAQ improved ventilation system-reversible ventilation system was designed. This system's working principle was introduced. For analyzing the superiority of reversible ventilation system, the conceptions of effective fresh air ratio and minimum effective fresh air ratio were described. The formula of effective fresh air ratio was deduced. The formula can be used to analyze the different air outputs of reversible ventilation system and conventional general ventilation system, in rooms with the same degree of fresh air. It can be taken as the guide for design and actual applications of reversible ventilation system.
A Note on Vertex-Neighbor-Integrity of Sequential-Joined Graphs
Authors: Wei Zong Tian , Mai An Chan , Liu Yong
Published: February 2014

The graphical parameter vertex-neighbor-integrity was introduced by Cozzens to measure invulnerability of networks. Dündar and Ozan discussed this parameter's properties of sequential-joined graphs. Unfortunately, the authors considered some special cases only and many mistakes appeared in their work. In this paper, based on our works done in 2005, we correct Dündar and Ozan's mistakes and discuss some related questions.
Ethernet Communication Interface Design Based on C8051F040
Authors: Guo Yu Xi , Li Guo Hong , Li Shuai , Li Ming
Published: February 2014

Based on 51 series of 8-bit microprocessor of Silicon Laboratories Inc. Designed and implemented Ethernet communication hardware and software interfaces. In the embedded operating system architecture, use the chip integrated IEEE 802.3 MAC and 10Base-T PHY's Ethernet interface chip CP2200 and the network development protocol stack, to achieve the drive programming for the underlying hardware and the protocol stack interface, complete Ethernet transmission of industrial network system data information.
Robust H2/H∞Control Strategy for Linear Markovian Jump Systems
Authors: Bian Min , Guo Qing Yun
Published: February 2014

The robust H2/H∞ control strategy for a class of linear continuous-time uncertain systems with randomly jumping parameters is investigated. The transition of the jumping parameters is decided by a finite-state Markov process. The uncertainties are supposed to be norm-bounded. It is desired to design a linear state feedback control strategies such that the closed-loop system satisfies H performance and minimizes the H2 norm of the system. A sufficient condition is first established on the existence of the robust H2/H∞controller bases on the bounded real lemma. Then the corresponding state-feedback law is given in terms of a set of linear matrix inequalities (LMIs). It is showed that this condition is equivalent to the feasible solutions problem of LMI. Furthermore, the control strategy design problem is converted into a convex optimization problem subject to LMI constraints, which can be easily solved by standard numerical software.
A Study on the Application of Learning Vector Quantization Neural Network in Pattern Classification
Authors: Ding Shuo , Chang Xiao Heng , Wu Qing Hui
Published: February 2014

Standard back propagation (BP) neural network has disadvantages such as slow convergence speed, local minimum and difficulty in definition of network structure. In this paper, an learning vector quantization (LVQ) neural network classifier is established, then it is applied in pattern classification of two-dimensional vectors on a plane. To test its classification ability, the classification results of LVQ neural network and BP neural network are compared with each other. The simulation result shows that compared with classification method based on BP neural network, the one based on LVQ neural network has a shorter learning time. Besides, its requirements for learning samples and the number of competing layers are also lower. Therefore it is an effective classification method which is powerful in classification of two-dimensional vectors on a plane.
Application of GQJS in Analysis of Bridge Structure
Authors: Zhou Man , Chen Jing Xi , Yu Meng Sheng
Published: February 2014

Some shortcomings exist in analysis of GQJS including: camber table generated in construction, nonlinear calculation in seismic analysis, simulation of complex elements such as corrugated steel webs, etc. This paper improved these disadvantages by analyzing practical cases. Some improvements are achieved: camber table can be obtained through adding an additional stage at the last step and distributing load on the entire bridge; GQJS can interact with ANSYS to employ its strong nonlinear analysis; it can discretize complex sections, and some other improvements are also carried out.
Strong Consistency of Maximum Likelihood Estimators in Extreme-Maximum-Value Distribution Model
Authors: Yin Chang Ming , Chen Bo Hong , Liu Shuang Hua
Published: February 2014

For the extreme-maximum-value distribution model, we show that maximum likelihood estimates of regression parameter vector is asymptotically existence and strongly consistent under mild conditions
What are the Resistances that Hamper the Application of BIM in China?
Authors: Wei Hai Min , Hu Wen Jia
Published: February 2014

This paper analyzes the obstacles of BIM development in China, through the comparison of the CAD and BIM application promotion speed and their characteristics, analyzes the reasons that the difficult development of BIM in China, and puts forward the corresponding strategies, and hope to help the engineering construction company.
Image Fusion Algorithm Based on Contrast Pyramid and its Performance Evaluation
Authors: Dong Yu Bing , Li Ming Jing , Li Jie
Published: February 2014

Contrast pyramid algorithm is put forward in this paper. The human visual system is sensitive to contrast information of image, so contrast pyramid algorithm would outstanding the contrast of image. The algorithm consists of creation process of Gauss Pyramid, the process of creating contrast Pyramid and reconstruction process of clear image. Simulation by MATLAB was completed in multi-focus image, multi-modality image and color image. Objective evaluation index such as mean, standard deviation, entropy and average gradient was calculated Simulation results and index show that the contrast pyramid algorithm has advantage of projecting the contrast of image, especially in color image fusion.
Image Fusion Algorithm Based on Gradient Pyramid and its Performance Evaluation
Authors: Li Ming Jing , Dong Yu Bing , Wang Xiao Li
Published: February 2014

Image fusion algorithm based on gradient pyramid is one of the multi-scale, multi-resolution decomposition algorithms. Original image was decomposed into Gauss pyramid, after that, gradient decomposition was completed on each layer in four directions, and fusion effect was evaluated by taking using of entropy, average gradient, mean and standard deviation. Simulation results show that gradient pyramid algorithm is effective to multi-focus image and color image.
Dynamic Intelligence Scouting and Monitoring System
Authors: Liu Ru , Liu Yan Jun , Zhang Lu Ji
Published: February 2014

In the present under the uncertain and change prevailing environment atmospheres influence, competitive intelligence without well-grounded methodologies and system for scouting and monitoring dynamic intelligence has become impossible. Dynamic intelligence process refers to continuous process of gathering, analyzing and reporting information about specified topics to users. The dynamic intelligence process should always be anchored to four key factors (IndustryTechnologyKey Person and Customer) within which information will be used. Whats more, we also need to know how to set up systems and models to identify and analyze competitors first of all.
Influences of Tennis Shoe Sole with Different Materials on Athletes’ Movement
Authors: Zhu Zi Xin
Published: February 2014

Different sole materials impose very important influences on athletes movement effects. Sole materials of tennis shoes to a large extent decide athletes start and sudden stop etc. Through the study of the influences of common abrasion resistant rubber, DRC abrasion resistant rubber and adiWEAR composite of tennis shoe soles on non-slip performance of the tennis shoes, it is concluded that DRC abrasion resistant rubber has the best effect on sudden stop of athletes; common abrasion resistant rubber is more beneficial to abrupt changes in athletes movement than adiWEAR composite, but in terms of start and acceleration, common abrasion resistant rubber is worse than adiWEAR composite. Meanwhile, common abrasion resistant rubber has better support effects for long-time competitions and is more beneficial to diversified movement changes of athletes.
A Case Study on Coal Industry of Shanxi Province in China: Empirical Analyses of Holding Power of the Resource-Based Region-Leading Industry over Regional Employment
Authors: Du Wei Hua
Published: February 2014

The paper made unary linear regression and structure deviation degree analyses with the data of Shanxi province in China from 1992 to 2010. The results show that when the coal output increases by 1% , the employment will increase by 1.202%. And the structure deviation degree in the coal industry fell from-0.11 to-0.56 between 1992 and 2001, then it aggrandized to - 0.15 in 2010. Which presented a note of discord surfaced during industrial structure and employment structure adjusting in Shanxi province. This suggests that there are the disguised unemployment within the coal industry. So this paper emphasizes that the government should implement the coal property right reform policy, and simultaneously develop effective measures to guide the workers to flow from the coal industry to the other secondary industries or the third industry.
Employee Satisfaction of Oil Industry Evaluation Based on Fuzzy TOPSIS
Authors: Li You Jun , Wang Jin Xin
Published: February 2014

Employee satisfaction is the key factor that affects oil industry employee performance and compensation management. Oil industry has high employee flowing problem, low manufacture efficiency problem, small employee loyal problem, etc. To solve the problems that exist in the oil industry employee satisfaction plays an important role, and the research staff satisfaction evaluation has a certain practical significance. This paper cites a new method -- fuzzy TOPSIS method to evaluate the employee satisfaction, can overcome the problem of evaluating indexes that are difficult to quantify, it has easy operation, high efficiency, less the required data, clear reveals problems, feasibility and applicability, etc. The evaluation results provide the basis for the human resource management department to develop staff satisfaction promotion strategy.
Analysis and Simulation of Stepper Motor Disturbance Considering Structural Coupling
Authors: Chen Jiang Pan , Cheng Wei , Han Wei
Published: February 2014

The disturbance mechanism of a two-phase hybrid stepper motor driving a rigid load with a transmission shaft is introduced, and its active disturbance and electromagnetic coupling disturbance are obtained by theoretical analysis and building the mathematical model of stepper motor output torque respectively. Then the simplified dynamic model of the whole mechanical system is given, and stepper motor disturbance considering structural coupling is obtained by building the vibration function of the dynamic model. Matlab/Simulink toolbox is used to simulate the analysis results. All the conclusions obtained establish a foundation for analyzing the solar array drive assembly disturbance.
Modal Analysis of Transient Liquid Sloshing in Partially-Filled Tanks
Authors: Zheng Xue Lian , Li Xian Sheng , Ren Yuan Yuan , Cheng Zhu Qing
Published: February 2014

To investigate the dynamic characteristics of liquid sloshing in partially-filled tanks, FLUENT simulation for liquid sloshing in cylinder tanks with the 40% liquid fill level and subject to lateral accelerations of 0.1 g-0.4 g were carried out. By the observation of transient sloshing force and the liquid free surface, it was found that the liquid sloshing is a periodic oscillation. Fourier transform was utilized to transform the sloshing forces in the time domain to the signals in the frequency domain. By spectrum analysis, it was found that the first-order oscillation that has the biggest amplitude is the most important one for liquid sloshing. For further command on liquid sloshing, modal shapes for the first sixth modal were acquired by ANSYS. It is drawn that the odd modals have anti-symmetrical shapes and the first-order oscillation makes the biggest contribution on liquid sloshing, the even modals have symmetrical shapes and could not contribute to liquid sloshing.
Cracked ITO on Polyester Film Substrates for Electro-Optic Applications
Authors: West John L. , Lee Da Wei
Published: February 2014

Vacuum deposited indium tin oxide, ITO, is the material of choice for producing the transparent conducting electrodes used in a wide variety of electro-optic applications, including flat panel displays and solar cells. In addition to rigid substrates such as glass, ITO can be coated on flexible substrates for the production of flexible devices. Because the ITO is brittle it easily cracks if the flexible substrates are bent. The cracking of the ITO is therefore viewed within the industry as a major problem. Here we demonstrate how we can control the cracking of the ITO to produce uniform electrodes. This is accomplished by bending the film around a tight radius of curvature. The electrodes are narrow having a width of 5~10 μm. The cracks separating the electrodes are much narrower with a width of less than 0.05 μm. We demonstrate the use of these substrates using a polymer dispersed liquid crystal switchable window that can be switched in individual lines creating an electronic venetian blind effect. The addressed lines in the PDLC are defined by the contact electrode and by the applied field. Because the cracks are much smaller than the thickness of the active PDLC material they are not visible. In addition to switchable windows these substrates can be used to make passive matrix displays and touch screens. Uni-axially cracking can be easily integrated into a roll-to-roll manufacturing process.
Finite Element Analysis on Inputting Cantilever of Bucket-Wheel Reclaimer Based on CATIA and ANSYS
Authors: Jiao Zhi Yong , Liu Xi Yang , Zhang Mei Yu
Published: February 2014

In order to verify whether the inputting cantilever of bucket-wheel reclaimer will be cracked and plastic deformation, in this paper, with inputting cantilever of modeling and finite element analysis, 3D entity model of inputting cantilever is established by using CATIA software. With the transmitting data interface of ANSYS software, it imports the inputting cantilever model, which is established in the environment CATIA, into ANSYS software. Through the static analysis on the inputting cantilever by the finite element software ANSYS, we can get static deformation diagram and von stress distributing diagram. From the analysis results, we can find the weakest spot according to the displacement cloud chart, and find the stress most centralized spot according to the stress analysis cloud chart, then carry on the intensity examination to it, and make description and mark on the maximum deformation and the maximum stress spot, and put forward the improvement plan to improve the service life. This method is a efficient path for the design and intensity examination of inputting cantilever, and it provides theoretical basis for further optimization design.
Analysis on Shaft Failure of the Twin Screw Pump
Authors: Jiang Jian Sheng , Zhao Zhi Yong
Published: February 2014

Screw pump as kind of displacement pump is suitable for transporting high-viscosity crude oil in a stable operation and high working efficiency. But over the past few years, one oil company has suffered from more screw pump failures which greatly impacted the normal crude oil pipeline delivery operation. Through a deep investigation into two times of shaft rupture incidents, the present paper performs a root cause analysis and provides the corresponding countermeasures.
Dynamic Update Mechanism in Wireless Sensor Networks
Authors: Pan Wu Min
Published: February 2014

Many researches use diff environmental conditions or application requirements in WSN. In the default Deluge mechanism, it will recover a sensor node from an updating error by reloading the stored full image again or waiting for the host machine to retransmit the full image again. This strategy is easy to implement and intuitive, but replacing the current executing image by retransmitting a full image file again is resource-consuming. To avoid retransmitting the full image when performing recovery, at the time when diff-based updating procedures have been finished, sensor nodes using our recovery mechanisms will backup the received patch files (i.e. diff script) in flash memory. Our mechanisms would effectively utilize flash memory space to store several backup patch files. When recovery is needed, our mechanismswould incrementally recover a failed node by patching up the system with each of the backup patch files. In the design of our recovery mechanisms, the failed sensor node will first try its best to recover itself without the assistance of the host machine, in order to avoid affecting the operations of other normal nodes when performing recovery procedures. Thus, compared with the full image replacement strategy, our mechanisms can save many computing resources.
Object's Centroid Localization Using Hu-Flusser's Moments Invariant
Authors: Wanchat Sujin , Plermkamon Supattra , Chetchotsak Danaipong
Published: February 2014

A combination between two components generally requires screws for assemble them together with high precision and accuracy that is need in industrial application. This research proposes the machine vision technique using Hu-Flussers moments invariant to locate centroids of target screws from a tray for loading instead of the current human vision in manual operation. To validate precision and accuracy template matching is tested in parallel with Hu-Flussers moments invariant. The results show that Hu-Flussers moments invariant is better in terms of precision and have robust ability to exclude outlier too.
IEEE 802.15.4 Performance with Wi-Fi Interference
Authors: Wang Fu Qiang , Wu Xiao Ming , Pang Yong , Liang Yan , Hu Yi Fan
Published: February 2014

This The IEEE 802.15.4 devices are proposed to operate in the 2.4 GHz industrial, scientific and medical (ISM) band. The other devices that use IEEE 802.11 b, g and n share the same frequency band. The interference caused by these technologies can degrade the performance of an IEEE 802.15.4 based wireless network. In this paper we study such degrading effects on a network equipped with IEEE 802.15.4 devices that is exposed to interference in turn with IEEE 802.11 b, g and n. The performance measure in this paper is the link Packet Receive Rate (PRR). Measurements are performed with real-life equipment, in order to quantify coexistence issues. We test all 16 channels of IEEE 802.15.4 in 2.4G band and the results show the decrease of PRR when suffering in close frequency with IEEE 802.11. The connection between energy detection and PRR is also exhibited in this paper.
Research of the Surface Changes in the Modification Process of Activated Carbon
Authors: Wang Xiao Pin , Li Yi Hui , Zhu Cou Hua
Published: February 2014

This paper studied the changes in the surface morphology and microcrystalline structure of GAC modified using the original activated carbon, HNO3, FeCl2·4H20, KMnO4. The micro pore structure on the surface is damaged after being treated by HNO3, and the transition pores increase; after being treated by FeCl2·4H20 and KMnO4,the carbon surface is irregular, and there is a protuberance, which is due to the irregular loading of manganese ions on the activated carbon surface. Then the roughness of the activated carbon increases and the size of graphite crystallite of GAC is also greatly reduced, showing obvious trend of fine grains. Meanwhile, the studies of the effect of removing the trichlorophenol from water after modification indicate that the results basically match. On this basis, the modified model is put forward.
Study of Method for Determination of Thermal Conductivity of Automotive Interior Materials
Authors: Zhang Li Xiong , Gao Rong Gang
Published: February 2014

Based on the traditional theory of transient plane source for thermal conductivity measurement, this paper designed and developed a new pattern of heating and temperature sensing probe, presented the study of transient heat conduction of half-infinite plane while being heated, established a modified mathematical model of transient plane source method, and achieved the measurement of thermal conductivity of automotive interior material sample by the data processing method of mathematical iteration and liner regression using the modified transient plane source probe. According to the data of experiments, the instrument which this paper designed has a high precision of 5% and a wide range of 0.003-1W/(mK).This paper provides a practicable way for heat capacity determination of automotive interior materials.
A Novel Method to Fabricate Silicon-Beam with Polygon Section Based on Thermal Oxidation Layer Protection Technique
Authors: Zhou Ze Long , Mei Chen , Su Xiang Yong , Li Tao , Tao Yi
Published: February 2014

Simplex wet etching method to fabricate silicon-beam has limited the categories of silicon-beam, it has confined the design and fabrication of silicon-beam with polygon section. Moreover, due to the side-etching of sidewalls and arris during the process of wet etching, the sections of the fabricated silicon-beam are not identical, which will induce the mechanics characters of silicon-beam to be altered, depressing the quality of silicon-beam; In order to avoid the shortages above, a novel method to fabricate silicon-beam with polygon section based on thermal oxidation layer technique is proposed, thermal oxidation SiO2 layer is utilized as the protection layer of the sidewalls of the silicon-beam instead of the mask layer as usual for the first time. Combining the wet etching technique with the thermal oxidation technique innovatively, several varieties of silicon-beam with polygon section, which can hardly be obtained only by the use of wet etching technique, can be manufactured, respectively. Based on such an innovative method, this paper proposes and develops five varieties of silicon-beam with novel structure by means of adjustable mask layer, extending the application field of wet etching. The subsequent fabrication experiment of silicon-beam with hexagonal section has been taken as an example to validate the technique principle. The dimension parameters of silicon-beam have been tested precisely and the arris angle error between the theoretic value and the experimental measurement is less than 1.5%; The SEM photos with the amplifier of 100 and 250 have been obtained through HITACHI S-4800 field emission scanning electron microscope (FE-SEM), the SEM results have demonstrated the clear sidewall arris without undercut. Through this fabrication method, the sidewall arris of silicon-beam can be maintained due to the protection layer of thermal oxidation SiO2. In this manner, the arris disfigurement of the silicon-beam decreases dramatically, the process of etching can be controlled precisely, and the quality of the silicon-beam has been improved greatly.
Study on the Effects of the Preparation Conditions on the Combination of Eosin Dye and TiO2
Authors: Liang Hui Rong
Published: February 2014

The absorption law of the eosin dye on the nanomaterials TiO2was researched in this paper. The effects of three factors as the absorption time, the initial dye concentration and the absorbed TiO2amount on the absorption efficiency were examined. The absorption amount Q and the absorption rate E increase in direct proportion to the absorption time and the absorbed TiO2amount, and while decrease with the rise of the initial dye concentration. The appropriate ranges of the three variables have been obtained in the paper.
Mechanic Models for Structure Health Monitoring Based on Wireless Sensors Networks Positioning
Authors: Fang Wei Hua
Published: February 2014

In order to fully utilize the advantages of indoor 3-D positioning of wireless sensor networks, according to the needs of large, complex structural health monitoring, combined with fracture mechanics and continuum mechanics theory, corresponding mechanical models based on wireless sensor network positioning are provided. The models provide health diagnostic criterion for crack stability, as well as large and complex structure. The investigation lays the foundation for three-dimensional positioning technology for wireless sensor networks applications in structural health monitoring and has very important significance.
Measuring Natural Frequency of Large Control Moment Gyroscope
Authors: Li Xue , Cheng Wei
Published: February 2014

As an actuator of spacecraft attitude control, the large control moment gyroscope (CMG) produces significant output torque and exhibits excellent linearity features for control, anti-disturbance, and rapid response functions. The large CMG is globally preferred for the execution mechanism of long-life spacecraft. This gyroscope is characterized by massive moving parts and distinct natural frequency between working and halting modes. Based on these features, this study measures the natural frequency of the large CMG by using both hammering and CMG startup testing.
Nanowelding of Single Walled Carbon Nanotubes onto Electrodes Using Molecular Dynamics Method
Authors: Liu Xuan , Liu Ze , Sun Pu , Wang Ya Rong , Wu Ying
Published: February 2014

Nanowelding system is set up to investigate the welding process of nickel electrodes to single walled carbon nanotubes (SWCNTs) with molecular dynamics method. This system consists of C-C, C-Ni, Ni-Ni subsystems. The interaction of C-C, C-Ni Ni-Ni are modeled by adaptive intermolecular reactive empirical bonder order (AIREBO) potential, Lennard-Jones (LJ) potential, as well as embedded atomic method (EAM) model respectively. The dynamic process of nanowelding at different temperatures and times is analyzed and described completely at atomistic length scales. The simulation results indicate that the nanowelding could be accomplished at 1450k which is far lower than the melting point of nickel.
Research of Front-End Modeling Design for a SUV Based on Self-Piercing Riveting Anti-Fatigue Design
Authors: Wang Xing , Liu Rui Jun , Dang Xiang Wen
Published: February 2014

By analyzing the modeling characteristic of ground and front-end impact areas, the modeling control strategy is proposed with regard to ventilation cover plate, engine hood, engine hood leading edge, fender and radiator grille, front bumper. The Riveting point support area concept is presented accordingly. Furthermore, the optimal position relationship of bumper modeling support area is obtained using the ADMAD under a given stiffness of bumper components. The result indicates that the optimized modeling can control the manipulation easily and helps to improve performance of driver assistance.
Solving the Deflection Problem of Laptop Casing Structure by Finite Difference Method
Authors: Hu Hao , Tang Wen Cheng , Huang Hui Xiang
Published: February 2014

Due to its large length/thickness ratio, the casing structure can be treated as plates andshells,thus the classical plates and shell theories can be applied. A general MATLAB program wasdesigned to solve the deflection problems of the isotropic casing with simple support usingdifferential method. To test its precision,two different load conditions as well as two materials wereused and their results was made comparison with that of finite element method and Navier solution.The results were in good agreement with each other and the method was efficient in solving thedeflection problems of a casing structure
Numerical Studies on the Performance of Saccardo Ventilation System in Emergency Fire Scenarios
Authors: Ganjiazad Rouhollah , Kazemipour Ali , Afshin Hossein , Farhanieh Bijan
Published: February 2014

In this study, the influence of volumetric flow rate and inclination angle of air jet is evaluated on the performance of a Saccardo ventilation system in a straight rectangular tunnel in case of fire. Simultaneous effects of volumetric flow rate and inclination angle of jet exiting the Saccardo nozzle on the behavior of smoke plume is considered by studying the structure of velocity profile before the fire source. It is found that this factor has a remarkable influence on the behavior of smoke plume and therefore, on the temperatures experienced near the fire. Besides, the influence of tunnel slope on the performance of the Saccardo system to sweep the plume is investigated. It is shown that the slope effect on the behavior of smoke plume and temperature profiles is completely different for locations before and after the fire, in both negative and positive slopes. Finally a range of volumetric flow rates and inclination angles is proposed as the optimized range of performance in an emergency fire scenario.
Experimental Verification of the Suppression Effect of Ship Shaft-Rate Electric Field
Authors: Zhang Hai Peng , Chen Xin Gang , Ao Chen Yang , Gong Wen Chao
Published: February 2014

To reduce the impact of shaft-rate electric field (SRE) on the concealment of the ship, The electric field immunity test is simulated with the laboratory scale model ship based on the analysis of the energy source of SRE. Experimental results show that the ship SRE can be suppressed effectively by the system, and the concealment of the ship is enhanced.
Comparative Study of Motion Control Card Based on NI PXIe and cRIO Platform for Three-Axis Turntable
Authors: Liu Guan Da , Mo Bo , Tang Bo , Li Yang Hua
Published: February 2014

In this paper, the Brushless DC motor (BLDCM) and reducer are used to drive each axis of three-axis turntable. In real-time servo control systems, the position loop parameters are designated by the software CME2, and the frequency band of the middle frame with the specified amplitude can be measured. Then, the drive model is alternated to the velocity loop, and two frequency bands will be got by using the controller of NI PXI-7344 and NI 9514 separately. The reason why the three frequency bands are different can be given by analyzing the data of the three sweep tests. In addition, both advantages and disadvantages of two NI motion controllers are illustrated. Finally, the paper points out the new motion control solutions to improve the performance of the servo system by autonomous intelligent control algorithm.
Design of Automatic Control System of Floating Dock
Authors: Guo Ting , Zhang Rui , Zhou Shao Hua
Published: February 2014

The ups and downs control is one of the important control functions of the floating dock.Using modern control technology, automatic control of the floating dock can not only reduce operation intensity, can also improve the execution efficiency, shorten the operation time, improve the safety of ships.Based on a certain type of floating dock,the article explains how the ups and downs of floating dock works and introduce the research and development process of automatic control of floating dock.
Study and Application of Sliding Mode Control Strategy for High-Power Current Source Inverter
Authors: Bai Jing , Lu Shi Qi , Liu Jian
Published: February 2014

For high-power current source inverter work object is a nonlinear time-varying systems, which could easily lead to the inverter voltage and current output waveform distortion, this paper firstly proposes a new variable-rate reaching sliding mode control scheme to solve the above problems existing in current source inverter system. In this scheme, we construct the variable structure model of the system, determine the sliding surface, give the variable-rate reaching control law and deduce the sliding domain. At last, the simulation result proves the validity and superiority of the scheme.
Design of a Communication Interface between the Controller and the Galvanometer
Authors: Wei Jun Chao , Zhang Guo Yuan , Chen Yao , Yan Xiu Tian
Published: February 2014

In a laser marking system, a laser marking controller should be designed to control several galvanometers through a certain interface using a certain protocol, such as the XY2-100 or SPI. The selection of the protocol depends on the configuration of the laser marking system. Using different protocols makes the controller design provide two types of interfaces. If different protocols have their own physical interfaces, the circuit becomes more complicated. In order to decrease the number of physical interfaces and ensure the protocol compatibility at the same time, two protocol signal generator modules based on FPGA are provided and the output signals of the two modules share the same physical interface, and only one of them can be chosen according to a flag set by users. This design makes the circuit simpler and decreases the design cost.
Reliability Evaluation of Main Electrical Connection of Substation Based on Graph Theory
Authors: Huang Yang Qi , Zhang Jian Hua
Published: February 2014

The main electrical connection of substation, consisting of transformers, bus bars, circuit breakers, isolating switches and other equipment connected with each other through cables, has an obvious characteristic in dots and lines, so graph theory is reasonable as the analysis method. Based on graph theory, the main electrical connection of substation is converted to the network model with nodes and branches. Connectivity between nodes on behalf of source points and load points is regarded as the reliability criterion, with the overload ability of transformer considered simultaneously. Non-sequential Monte Carlo is used to simulate the condition of equipment in the main electrical connection, along with the states of the system. The reliability of single-bus connection and sectionalized single-bus connection is calculated under given reliability criterion, and the results indicate the feasibility of graph theory method and correctness of the modified reliability criterion.
Capability Based Weapon System-of-Systems Evaluation Strategies Design Space and Exploratory Analysis
Authors: Li Zhi Fei , Li Zi Mo , Yang Feng , Zhu Yi Fan
Published: February 2014

It is an urgently problem to be solved that how to test a weapon system-of-systems capabilities in a joint operational context. Firstly, based on the capability assessment of weapon system-of-systems, a procedure of weapon system-of-systems capabilities evaluation strategies design space is proposed. Secondly, supported by agent-based simulation tools, an exploratory analysis example is given which uses the fractional factorial design and stepwise regression fit. This paper makes a better try on the measures selected of the system-of-systems capabilities in the early period of weapon equipment acquisition.
Design of a Reconfigurable Extendible Real-Time Multi-Bus Simulation System on the Information Flow in the Control Systems
Authors: Wang Ling , Mo Bo , Gao Ke , Lin Jin
Published: February 2014

A simulation system on information flow is designed to emulate the data communication on the RS-485 bus, the 1553B bus and the Ethernet bus. This simulation system has a high requirement for the extendibility, and it must have an ability to regulate and reconfigure the information flow on the three buses. To deal with the above problems, the simulation system has to be designed as a reconfigurable extendible real-time multi-bus simulation system. In order to meet the real-time requirements for the simulation of the information flow and the universal property for the most systems, this simulation system must be carried out based on a real-time operating systems (VxWorks) and a common hardware platforms. Firstly, this simulation system will have a total emulation and a whole simulation for the information flow, the communication status, the monitor nodes and the control nodes on each of the three buses. Secondly, this simulation system defines an extendible protocol between the simulation sever and the simulation terminals, and strictly plan the information flow among the simulation terminals to achieve the design requirements of the actual system. And then the simulation system has to own a reconfigure software components and a complete database functions of recording and stacking the data.
Scene Classification Based on Improved Spatial Partition Model
Authors: Liu Zhi Yuan , He Jin , Wang Jin Long , Zhao Fei
Published: February 2014

In order to make full use of the spatial information of images in the classification of natural scene, we use the spatial partition model. But mechanically space division caused the abuse of spatial information. So spatial partition model must be properly improved to make the different categories of images were more diversity, so that the classification performance is improved. In addition, to further improve the performance, we use FAN-SIFT as local image features. Experiments made on 8 scenes image dataset and Caltech101 dataset show that the improved model can obtain better classification performance.
Study on the Production Decline Laws for Vertical Fracture Well in Low-Permeability Gas Reservoirs
Authors: Wang Yi Ning , Wu Xiao Dong , Wang Rui He , Lai Feng Peng , Qi Bei Lin , Zhang Zhuang
Published: February 2014

The vertical fracture was asymmetrical about the wellbore or two wings of a fracture are not certainly in a line for the complex geo-stress in the possession of fracturing of the gas reservoirs. In view of the low permeability reservoir after fracturing developing the asymmetrical vertical fracture and non-coplanar fractures, based on the non-steady seepage theory, using the potential function theory, superimposition principle and numerical analysis method, a performance prediction model for the vertical fracture in low-permeability gas reservoirs was deduced with pressure drop superposition principle. The production decline laws were analyzed by practical cases. The result shows that the initial production of the vertical fracture is relatively high but soon followed by a sharp decline. Then, the production keeps in a relatively stable state and declines slowly in the middle and later. The fracture asymmetry factor has little effect on the gas well productivity. The non-coplanar angles have greater effect on the oil well productivity in the initial stage. The more the fracture length and the bigger the flow conductivity, the higher the oil well production and the faster the decline rate will be. However, the increase amplitude will be getting smaller and smaller along with the fracture length and flow conductivity.
Design and Experiment of T-Shape Glass Micro-Nozzle for Preparation of Microcapsules
Authors: Li Zong An , Hou Li Ya , Zhang Wei Yi , Zhu Li
Published: February 2014

In order to study the fabrication of T-shape combined micronozzle used for preparation of microcapsules, a gravity based apparatus for glass micronozzle was designed. A novel method for glass micro hole was proposed. The impact law of pull force, coil temperature, delay time, coil width on pull process, heating time, feed distance on forge process, and heating area on micro hole fabrication process were experimentally researched. Sealed by UV optical glue, a kind of T-shape combined glass micronozzle was prepared. Orderly core oil emulsion in sodium alginate solution and core oil, poly microsphere (PS) and glass microsphere microcapsules were prepared based on combined pulse dispensing with the T-shape micro-nozzle. Results showed that the T-shape combined glass micronozzle had the advantage of simple structure, low cost, good bio-chemical and optical character and the T-shape micronozzle could be used to produce multiphase liquid flowing and dispensing. It is promising to be applied wildly in other areas.
Quality Control of Materials in Pressure Pipeline during the Installation
Authors: Li Ping
Published: February 2014

Quality control of construction materials is one of the entire pressure pipeline installation project an important part of quality control. The quality control includes the procurement, acceptance testing, storage, distribution and use during the installation.