bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Failure Criterion of Concrete under Multi-Axial Stress
Authors: Liu Guo Jun , Wei Zhao Lan
Published: September 2013

In the actual structure, the concrete materials are mainly in multi-axial stress state. Because of the rapid development of concrete structures and the continuous improvement of structural engineering analysis theory, engineers have put forward higher requirements for concrete performance under multi-axial stress research. Based on stress space, this paper studies strength failure criterion of concrete, analyzed its limitations, and proposed concrete strength failure criterion research directions. It plays a strong practical role in scientific research.
Preparation of Continuous Electrospun Nanofiber Yarn with an Auxiliary Rotating Circular Plate
Authors: Gao Wei Jie , Wang Xiao E , Wang Kun , Fan Jie , Liu Yong
Published: September 2013

Nanofiber yarn, since it might be used in weaving and knitting, has been of great interest recently due to the potential application in many fields. A modified method to produce continuous nanofiber yarn using two oppositely spinnerets system with an auxiliary rotating circular plate is suggested in this work. The influence of process parameters, such as applied voltage, spinneret-plate distance and the angle between the two spinnerets, on the morphologies and properties of nanofiber yarn were investigated in detail. The optimum process parameters obtained include that the applied voltage was 15kv, the spinneret-plate distance was 7cm and the angle between the two spinnerets was 130o. The mechanical properties of these yarns have been evaluated, including twist and tensile strength. This work can provide a novel and general approach to design and produce nanofiber yarns for textiles, biomedical and industrial applications.
Production Quality Control of Moderate Heat Portland Cement and Analysis of Application Effect in Roller Compacted Concrete
Authors: Yang Yong Min , Cai Jie Long , Chen Ze Peng
Published: September 2013

Moderate Heat Portland Cement is not only frequently-used cement for dam but also one of the largest amount of special cement as a main cementitious materials of concrete in hydraulic structure in China. Due to the high quality requirement and the complicated technology in the construction of dam, a series of measures are adopted to control the production quality of Moderate Heat Portland Cement used in the dam construction. In this paper, the measures of production quality control of the Moderate Heat Portland Cement are introduced, including controlling the raw materials such as the cement raw meal, fuel, clinker and gypsum, managing the discharge from the mill and the entrance test, which ensure that the various targets of physical and mechanical indexes are in accordance with the standard requirement. Moreover, the engineering quality of Roller Compacted Concrete (RCC) for the dam is effectively guaranteed through the lower pot temperature and the less hydration heat. The construction experience is available for the like-kind engineering interiorly.
Effect of Copper Slag on Properties and Structure of Cement and Concrete
Authors: Song Jun Wei
Published: September 2013

In this paper, the effects of using copper slag wastes on hydration, gelling properties, mechanical properties, pozzolanic activity and durability aspects of concrete are studied.. It has been found that copper slag have micro pozzolanic effect in the study. The concrete batches with copper slag addition presented greater mechanical and durability performance. The mechanism of copper slag powder in composite cementitious materials is filling effect, activity effect and acceleration effect. The filling effect of copper slag can make matrix denser and the accelerating effect can accelerate the early hydration. At the same time, the problems existed in the comprehensive utilization of copper slag have put forward, and the key research direction has been raised for the future study, and an entry point has been provided for future copper slag utilization research.
Exquisite Representation in Peter Zumthor's Works
Authors: Jia Jiao Jiao , Liu Song Fu
Published: September 2013

The article is based on the refinement of Peter Zumthor's works, through analyzing and researching the works, to know the relation of time and tradition, form and technology, function and space, explore the connotation as well as the unique view for contemporary architecture.
The Construction of the SGW-Based Bar-Beam Elements
Authors: Liu Yan Xin , Wang Han Xiang , Fu Qian Qian , Yang Xiang Xiang , Ding Guo Dong
Published: September 2013

PsdVoigt2 function was used to fit SGW function and a series of bar beam elements based on the theory of SGW and wavelet finite element were constructed. Traditional finite element polynomial interpolation was replaced by the SGW scaling function and transformation matrix was utilized to transform wavelet interpolation coefficients to physical space. Thereby the shape function and element were constructed. The precision of a series of bar beam elements constructed with the SGW scale function as the interpolation function were verified by the calculation cases. The calculation results showed that the precision of the SGW-based element constructed was higher in calculating the deformation and strain. And the SGW-based bar beam element constructed enriched the element library of wavelet-finite element method.
Photocatalytic Activity of Titania Nanowire Arrays by Sol-Template Method
Authors: Li Ming Li , Yu Qiong , Qian Kun Ming , Zhou Yu Song
Published: September 2013

The template method combined with sol-dipping deposition or sol-electrophoresis was used to prepare titania (TiO2) nanowires with shape of rod or string of beads. When irradiated under ultraviolet (UV) light for 1 hour, the degradation rate of methyl orange (MO) using nanowire arrays reached 98.5% which was 1.84 times as much as that of the thin film on glass plate, and when irradiated under visible light for 6 hours, the degradation rate reached 96.7% which was 4.17 times as much as that of the thin film.
A Numerical Study of the Impact of Tunnel Depth on Surface Displacement in Shield Tunnel Construction
Authors: Zhan Hui Ting , Yuan Hong , Wu Jia Yu , Yuan Yu Sen
Published: September 2013

Using 3d finite element method can simulate the process of shield tunnel construction. The paper studies the impact of different tunnel depth on the deformation of soil, when considering different excavation steps in the process of tunnel construction. The results show that the shallower the tunnel depth, and the greater the amount of the surface displacement during the tunnel construction. In the process of the tunnel excavation, the soil surface displacement in front of the shield machine is the result of superposition of the uplift and subsidence. When the tunnel depth increases, the surface displacement curve becomes smoother, and the rate of change becomes slower.
Experimental Research on Shrinkage Properties of Cement Stabilized Iron Tailings Sand Mixture
Authors: Pan Bao Feng , Shi Hong Yu , Zhou Chang Hong
Published: September 2013

Variation laws of cement stabilized iron tailings sand mixtures loss of water, dry shrinkage strain and temperature shrinkage coefficient have been obtained by the indoor shrinkage test, which are compared with cement stabilized gravel. Results of test show that its dry shrinkage strain are greater than cement stabilized gravel. There is no significant difference of temperature shrinkage coefficient between two mixtures above 273.15K, but this index of cement stabilized iron tailings sand mixture is significantly larger than that of cement stabilized gravel below 273.15K, which provides theoretical references for promotion and application of iron tailings sand in road engineering.
An Inductive Method for Soil Mechanics
Authors: Qin Hong Fei , Liu Yan Ke
Published: September 2013

Soil Mechanics, as one of the most important basic courses in civil engineering, hydraulic engineering and other courses, mainly analyzes the questions of deformation and stability of the soli body. The undergraduates begin to learn soil mechanics after finishing advanced mathematics, college physics, theoretical mechanics and mechanics of materials. The objects researched in the above-mentioned courses are idealised, so the rigorous mathematic deduction is feasible and only a few hypotheses are needed. Soil is different from other materials, so inevitably the methodology and thinking mode in soil mechanics are special compared with other mechanical courses, which makes students feel confused at the beginning stage of this course. It is necessary to let students know the teaching idea, research method, common problems during the instruction of soil mechanics, which is also helpful to their further studies and researches. Based on these factors, an inductive teaching method is put forward, which summarizes the essential ideas and important questions in soil mechanics.
Thermodynamics Coupling Analysis of Grid-Controlled Electron Gun
Authors: Song Fang Fang , Xu Sha , En Yun Fei
Published: September 2013

This paper carried out temperature analysis in the working state of the electron gun structure, the thermal deformation under high temperature and thermal stress analysis. Firstly, from the steady state temperature cloud chart of the electron gun we can see the cathode temperature is 985 °C, shadow grid temperature is same as cathode temperature, and the controlled-grid temperature is as high as 540 °C. Secondly, on the basis of thermal analysis, the coupled thermo-mechanical simulation technology is broken through; further thermal stress and thermal deformation at high temperature are analyzed. Thermal stress analysis results show that the maximum stress point is at contact area of cathode and its supporting tube. And the thermal deformation result shows that at high temperature under the action of thermal deformation, the axial distance of cathode-grid distance reduced 0.078 mm. Based on thermal deformation, the development personnel of microwave tube can use simulator to analysis the influence of thermal deformation to the electron gun design parameters, which can provide theoretical basis for tube design.
Internal Force Evaluation of Non-Uniform Beam in Portal Frame
Authors: Jia Wen Wen , Wang Deng Feng
Published: September 2013

To simplify the internal force evaluation of portal frame being composed of non-uniform members, the force method was used to solve internal force of every key section of the non-uniform beam in portal frame with single-span. Gauss numerical integration method was used to simplify the complex integration when the deformation energy was calculated. Under the precondition of satisfied accuracy, the direct expressions of bending momentshear force and axial force of every key section of beam were obtained. The research work can be used as reference for the evaluation and design of portal frame members.
The Effect of Nonlinear Isolator on Diesel Engine Vibration Isolation System
Authors: Song Yu Chao , He Zhao Qi , Li Zhen Zhong
Published: September 2013

A flexible isolation system of diesel engine was modeled to deeply study the effect of nonlinear isolators on the system response, and some cases of two-layer isolators were analyzed in ADAMS. The results show that when there are only the upper isolators with nonlinearity, the acceleration of engine block is decreased by 18.75% than that with linear isolators, and the acceleration of middle raft is decreased by 66.96% at the same time. However, when only the lower isolators are nonlinear, the acceleration of engine block is increased by 53.13%, and the acceleration of raft is decreased by 90.44%. The performance of system with all nonlinear isolators is similar to that of system only with upper nonlinear isolators.
Research Overview of Full Aero-Engine Dynamic Response Caused by Blade-Off
Authors: Ye Dong , Xuan Hai Jun , Liu Lu Lu
Published: September 2013

With the development of aviation industry, more and more performance requirements are submitted to aero-engines, and structure response and safety problem of aero-engine is concerned. Overview is made of the recently years full engine vibration response due to blade-off. And summary about case containment and rotor dynamic response caused by sudden unbalance in blade-off situation is presented. Then the analysis technologies and modeling methodologies of full engine blade-off structure response are focused. According to the trend, the field of couple vibration analysis should be paid more attention to in the research of full engine dynamic response during blade-off.
Finite Element Analysis of Diamond Wire Saw Slicing SiCp-Al Composites
Authors: Zhang Chun Yan , Sun Yuan , Zhao Li Gang
Published: September 2013

In order to study the physical nature and basic rule of diamond wire saw slicing SiCp-Al composites, the slicing mechanism was studied in theory first. There are different ways of slicing Al and SiC particles respectively: Al is sliced in plastic way and SiC particles are sliced in brittle ways such as being cut off or pulled out or pressed into matrix or burst. Then based on the finite element software Abaqus, the process of diamond wire saw slicing SiCp-Al composites was simulated. The distribution of internal stress and surface topography was discussed: The internal stress in SiC particles is far high than that in Al. The surface topography of sliced SiCp-Al composites is determined by SiC particles states mainly. The research results provide reference and guidance to the optimization of actual process of diamond wire saw slicing SiCp-Al composites.
Enhanced Photocatalytic Performance of Iodine Doped Bi2WO6 Nanostructures under Visible-Light Irradiation
Authors: Cao Bao Wei , Xu Yun Hua
Published: September 2013

Bi2WO6 doped with iodine ions were synthesized using hydrothermal method and their photocatalytic activities to degrade Rhodamine B (RhB) under visible-light was investigated. The successful incorporation of I ions in Bi2WO6 was proved by XRD and XPS. UV-vis absorption spectra results show that I ion was successfully doped into Bi2WO6 and a red shift for I-doped Bi2WO6 appeared when compared to pure Bi2WO6. The photocatalytic activities of the photocatalysts were evaluated by the decolorization of RhB under visible-light irradiation. The results showed that the photocatalytic activity of I-doped Bi2WO6 was much higher than the undoped Bi2WO6.
Improved Transfer Matrix Method in Analysis of Cylindrical Shell with Partially Covered Constrained Layer Damping
Authors: Wan Hao Chuan , Li Yi Nong , Zheng Ling
Published: September 2013

The transfer matrix method in analysis of cylindrical shell with partially covered ring-shape constrained layer damping is improved. In this new method, state vector and boundary condition vectors are independent, so the computation of state vectors first derivative is simplified. An association matrix is introduced to connect state vectors and boundary condition vectors. In the uncovered section, the parameters of damping layer and constrained layer are considered as constant and leaded into state vectors and boundary condition vectors, so the transfer matrixs dimension of uncovered and covered section are same and the total transfer matrix can be obtained easily. The validity of this method is proved by an example.
Numerical Simulation of Boiling Flow in LNG Releasing Underwater Process
Authors: Zhang Bin , Zhang Jian Wei , Wu Wan Qing , Yu Gui Feng
Published: September 2013

The boiling flow of LNG releasing underwater was numerically simulated by establishing liquid-liquid boiling flow transfer models and using multi-fluid model in FLUENT. The effects of quenching, average bubble diameter and turbulencemodel on the characteristics of hydrodynamic, heat and mass transfer processes were demonstrated. The results showed that in the progress of heat transfer between LNG and water, surface quenching makes an important role. The heat and mass transfer rate was influenced by valuing average bubblesdiameter. Because of per-phase turbulent flow making an equilibration important role in boiling flow process, turbulence models must be simulated respectively.
Study on Water Spraying System in Wet Electrostatic Precipitator
Authors: Xiao Li Chun , Ding Zhi Jiang , Li Qiang
Published: September 2013

The dust collected in the polar plates can be washed out by a spraying system in the wet electrostatic precipitator. It is important to keep the spraying system having a high efficiency lest the dust returns to the gas again. The performance of the spraying system in the electrostatic precipitation and its influence on the dust collection efficiency are presented in the paper. The atomization characteristic of the spraying nozzle is measured by changing the water pressure and operating voltage. The results show that: Collection efficiency of the electrostatic precipitation is over 99.5 % when the water pressure is 0.4 MPa.When the spraying mists diameter is 100 μm, the collection efficiency is 92 % for the dust diameter under 10 μm. It will provide a basis for the design of spraying system in wet electrostatic precipitation by this analysis.
Numerical Simulation of Rayleigh-Taylor Instability with Large Density Ratios Based on RKDG Method
Authors: Tian Jun Wu , Yuan Xiang Jiang
Published: September 2013

Rayleigh-Taylor instability problem with large density ratios is simulated by RKDG method which is developed for Euler equations with an additional body force corresponding to the gravity. The interface capturing ability of RKDG method is testified, while the density ratio (heavy to light) ranges from 3 to 20. Numerical results show that RKDG method has capability to pursue contact discontinuity in Rayleigh-Taylor instability with large density ratio. In the late stage of Rayleigh-Taylor instability problem, the contact line begins to crash, but the numerical solution is still smooth near the interface and has high resolution.
Reconfiguration Modules Based Displacement Group Propagation
Authors: Zhang Li Ping , Jin Zhi Yuan , Bu Fan Ling , Pang Gui Bing , Zhou Mao Jun
Published: September 2013

This paper investigates a metamorphic mechanism that can be decomposed and expressed by group chain corresponding to the kinematic equivalence leading to equivalent kinematic function but with different configurations. The metamorphic process is implemented through metamorphic module combinations and corresponding reconfiguration operations. However, metamorphic module is a constitution of a group using intrinsic geometrical entities instead of frame-dependent motion matrices and considering the available kinematic pair structures, which has potential ability to degenerate as inherent components. Moreover, the kinematic sequencing can set up a model for metamorphic configuration characteristics and the topology variation can be operated by metamorphic module variation with the displacement group transformation and propagation. A metamorphic mechanism can be converted into various topological configurations with respect to kinematic metamorphosis of joints and links in terms of metamorphic modules based on set theoretic.
Cycling Comfort Levels for Recumbent Exercise Bicycles
Authors: Yen Chien Cheng , Wei Wan Li , Tao Liu
Published: September 2013

This study used recumbent exercise bicycles as the target of investigation and adopted the subjective comfort level assessment results for users after riding to determine the optimal seat position for recumbent exercise bicycles. A total of 16 healthy female participants with heights between 155 and 165 cm were recruited. Participants were required to ride the exercise bicycle at six different seat positions for 1 minute at 65 revolutions per minute (rpm). A 7-point Likert scale was used to conduct the overall comfort-level assessment. The results were as follows: 1) A significant variation in the overall comfort level of the subjects occurred for different seat positions; 2) for women with heights between 155 and 165 cm, the optimal seat position was when the seat center was 629 mm (horizontal distance) from the crankshaft center and 467 mm from the ground surface; and 3) by using regression analysis, the optimal seat position for various heights when riding was derived as follows: seat center position from the crankshaft center (horizontal distance; mm) is equal to 357.729 + 0.687 body height (cm), and seat center position from the ground surface (vertical distance; mm) is equal to 153.018 + 3.005 body height (cm).
Investigations on the Fatigue Property of the High-Strength and Toughness 211Z Casting Aluminium Alloy
Authors: Zhang Xiao Min , Mao Jian , Che Yun , Zhang Zhong Ke
Published: September 2013

211Z is a new type of high strength and toughness Al-Cu-Mn casting aluminum alloy. With the aid of GPS-100 high-cycle fatigue testing machine and DDL100 multifunction tensile testing machine, conventional mechanics performance tests and high-cycle fatigue tests were carried out in this paper. The conventional mechanical property results show that the tensile strength is 477.5 MPa, the theory yield strength is 397.5 MPa and the elongation is 6.625%. Fatigue experiments were performed with load control at room temperature and R =-1 in ambient air. The tensile and compression fatigue strength is 130 MPa under ten million times fatigue test, and S-N fatigue life curve of this alloy was also given in the investigations. 211Z casting aluminum alloy possessing high fatigue strength can be attributed to the fact that it owns high strength and good plasticity simultaneously. The microstructure analysis of fatigue fracture appearance shows that, the fatigue crack initiation behavior of this aluminium alloys depends mainly on the region possessing defects under the surface, there has only one crack source, which means it is belongs to low nominal stress unidirectional bending. In the crack growth stage, the width of fatigue striations decreases with the increase of stress, and a few secondary cracks were found in this stage. When cracks finally losed stability, an instantaneous fracture occured in the investigated samples. Shear lips and dimples were found in the fracture appearance and the final fracture is belongs to ductile fracture.
The Fuzzy Reliability Calculation for Cylinder Liner Wear Life of Internal Combustion Engine
Authors: Liu Xiao Xu , Chen Min
Published: September 2013

The concepts of fuzzy reliability are introduced, and the model of fuzzy reliability calculation for cylinder liner wear life is set up. A fuzzy reliability calculation example of cylinder liner wear life for vehicle engine with 4 cylinders is given. The different of reliability calculation between the sample reliability and fuzzy reliability are discussed, and point out that the key for fuzzy reliability calculation is to decide the fuzzy range properly.
Analysis and Comparison of Seal Ability of Premium Tubing Connections under Axial Alternating Load
Authors: Huang Long Cang , Cao Yin Ping , Yu Yang , Dou Yi Hua
Published: September 2013

In the process of oil and gas well production, tubing connection stand the axial alternating load during open well, shut well and fluid flow. In order to know premium connection seal ability under the loading, two types of P110 88.9mmx6.45mm premium tubing connections which called A connection and B connection are performed with finite element analysis, in which contact pressures and their the regularities distribution on sealing surface are analyzed. The results show that with the increasing of cycle number, the maximum contact pressures on sealing surface of both A connection and B connection are decreased. The decreasing of the maximum contact pressures on B connection is greater than those on A connection. With the increasing of cycle number of axial alternating compression load, the maximum contact pressure on sealing surface of A connection is decreased, and the maximum contact pressure on sealing surface of B connection remains constant. Compared the result, it shows that the seal ability of A connection is better than B connection under axial alternating tension load, while the seal ability of B connection is better than type A connection under axial alternating compression load.
Plasticization of Trunk Lid and Molding Parameter Optimization
Authors: Yu Duo Nian , Shao Chang Ming , Zhang Ben Yan , Han Lu , Zhou Lu Yao
Published: September 2013

A trunk lid plate was taken as an example and Fiberglass-reinforced PET material was used to replace steel for weight-saving in this paper. According to the thin plate stiffness theory, thickness of suitcase cover plate is 3 mm approximately, using finite element simulation analysis to verify its stiffness and mode meet requirements exactly. Injection molding was chosen as plates forming method. Plastic parts warpage had closely relationship with various process parameters, orthogonal experiment was used to find the optimal parameter in the given range.
Dynamic Characteristics of a Horizontal Milling Machine with Hybrid Guideway Systems
Authors: Hung Jui Pin , Lin Wei Chu , Luo Tzou Lung , Lai Yu Sheng
Published: September 2013

This study was aimed to investigate dynamic characteristics of a milling machine with horizontal spindle tooling system, which was feed through the linear feeding mechanism combined with the sliding guides and linear roller guide modulus. To predict the dynamic characteristics, we created finite element model of the milling machine with the introduction of the contact stiffness defined at the sliding and rolling interface, respectively. The results of the finite element simulations reveal that linear guides with different preloads greatly affect the dynamic responses of the horizontal spindle tool. The maximum dynamic compliance can be increased by 7.4 % in X-axis direction and increased by 12 % in Y-axis direction, respectively when the linear guides are changed from low to high preload. Overall, current results clearly illustrate that the proposed modeling approach of feeding mechanism can quantify the preload effect of the guideway system on the dynamic performance of a milling machine.
On the Modern Service Industry to Separat from the Manufacturing Industry in Hebei Province
Authors: Liu Bang Fan , Xu Shui , Ma Xiu Li
Published: September 2013

On the whole, the road that the modern service industry of Hebei province from manufacturing stripping is still not clear, many obstacles still exist, especially prominent in the performance of enterprises, mainly the following three aspects: Manufacturing companies are reluctant to divest its productive service industry. The manufacturing industry production service industry does not have the ability to peel. The concept that cannot be stripped is still outstanding. The separated mode of the producer services of the Hebei manufacturing industry is that: step-by-step separating, step-by-step integration, o the enterprise production service outsourcing as the starting point, come true vigorously construction of Hebei province service outsourcing base.
A Study of Environmental Risk Comparison Based on Set Pair Analysis Theory
Authors: Wang Lin , Ma Zhong Qiang , Yu Shu Ping , Zhu Jing Hai
Published: September 2013

The unreasonable plan and layout on Petrochemical Park will increase environmental risk. Based on conception for identity degree in Set Pair Theory, environmental risk on Petrochemical Park of multiple planning schemes was compared. The paper formed the Set Pair Analysis model on scheme comparison and introduced a case of Petrochemical Park. The identity degree of three alternative schemes for the case was calculated. The identity degree of A scheme is 0.949, B scheme is 0.984 and C scheme is 0.945.The identity degree of B scheme is maximum which can be the optimum selection for the Petrochemical Park in case.
Preparation of Ti3Al Based Alloy Expansion Part for Nozzle by Powder Metallurgy
Authors: Lang Ze Bao , Yin Zhong Wei , Shi Jin Liang , Zhao Feng
Published: September 2013

Ti3Al based alloy has performed a comprehensive properties of low density, high tensile strength and excellent oxidation resistant at high temperature, which results in a good potential application in aerospace areas. In this paper, technologies relevant to preparation of Ti-23Al-17Nb expansion part for nozzle have been studied, and main properties of the part have been test and evaluated. The result revealed that Ti3Al based alloy prepared by powder metallurgy can replace nickel based alloy to be a candidate materials for high temperature structures.
Dynamic Context-Aware System Based on Multi-Level Material Data Control Model
Authors: Xue Dong Juan , Pan Ying
Published: September 2013

Context-aware applications can sense and explore the context of production processes to provide proper and useful services to managers in workshop. Firstly, a multi-level ontology model of materials is found which is expressed in OWL as an ontology collection of describing places ages and events and associated properties among them. Secondly, a multi-level context-aware control model and its mechanism are produced. In this model, data integration is controlled by the demand state transitions at different levels including workflow levels, control levels and data levels, which incorporates dynamic context information. And context is classified based on the analysis of demand into five main categories, which is further categorized as simple condition and composite condition to form a multi-level context. And the data integration model is implemented dynamically by checking the context constraint associated with each application task at the time of the specific request submission. Finally, a case study is developed within a manufacturing enterprise to show the benefits of the model.
ATC Estimation Approach Applying Co-Evolutionary Strategy
Authors: Chai Ai Ping
Published: September 2013

Under electricity market environment, it is very important how to calculate available transfer capacity (ATC) of power grids with high speed and precision, and how to ensure its safety and stability. In order to resolve the issue more effectively and operate the power systems more efficiently, in this paper an co-evolutionary strategy is proposed for ATC estimation based on particle swarm optimization (PSO) and artificial fish swarm algorithm (AFSA), where PSO and AFSA are respectively improved to boost the efficiency. In the end, simulation studies show that the proposed method is capable of estimating ATC with high speed and sufficient precision.
Optimization of a Novel Micro-Hotplate for Gas Sensor
Authors: Li Chang Chun , Zhang Xiao Bo , Liu Li
Published: September 2013

A novel design of micro-hotplate is proposed for micro-structural gas sensor. The simulation results of ANSYS reveal that higher temperature and more uniform temperature distribution was achieved in the micro-hotplate when the thickness of SiO2, thickness of Si substrate, electrode width and electrode space were designed to be 100, 200, 20 and 230 μm, respectively. The new micro-hotplate is benefit for the improvement of sensor sensitivity.
Health Condition Prognostics of Complex Equipment Based on Discrete Input Process Neural Networks
Authors: Ding Gang , Lei Da , Yao Wei
Published: September 2013

Considering the problem of health condition prognostics of complex equipment, a discrete input process neural networks (DPNN) model based on process neural networks (PNN) is proposed in this paper. DPNN utilizes vector inputs together with convolution operator to gain the capability of time and spatial aggregation operation, which is implemented with continuous function inputs and integral operator by PNN. Different from PNN, DPNN can use discrete samples as inputs directly, thus can avoid precision loss during procedures of data fitting and function expanding required by PNN. The application of DPNN to health condition prognostics of complex equipment is described through the prediction of the future health state of the civil aircraft engines, where the short-term and long-term predictions of the health condition represented by the exhausted gas temperature time series are conducted. Moreover, the performance of DPNN is compared with common artificial neural networks (NN) and PNN. The results show that DPNN has satisfied performance for health condition prognostics of civil aircraft engines, and DPNN performs better than both NN and PNN, which prove that DPNN is suitable for health condition prognostics of complex equipment.
Bulk Unloading Crane Monitoring System's Design and Development Based on Kingview
Authors: Pang Xue Song , Su Zeng Rong
Published: September 2013

The paper analyzes the main functions and equipment structure of bulk unloading crane monitoring system. Then we design and develop the monitoring system based on Kingview software, describing the operation processes and monitor screens in detail. The monitoring system we developed is successfully used at Fangcheng Port bulk unloading crane No.14 and No.15, and bring in good operation effectiveness to Fangcheng Port.
A Multi-Degree of Freedom Laser Scanning Simulation Platform
Authors: Sun Hua Jie , Huang Jin , Guo Ge , Hu Ying
Published: September 2013

The multi-degree of freedom laser scanning simulation platform used for simulating most on-line scanning and measuring equipments in manufacturing fields is beneficial to raise the design efficiency and save the design time of dedicated measurement equipment. The measuring model of the system is established by combining the D-H kinematics model with the linear structured light model in the article. The system model parameters are calibrated via various calibration methods. The results obtained have been analyzed by scanning criterion sphere in different angle and position. The experiments show that the system can meet the requirements of ordinary complex workpiece inspection and the measuring precision can achieve approximately 0.1 mm.
Research on the Algorithm of Adaptive Loop Filter Based on Flexible Quadtree
Authors: Wang Gang , Chen He Xin , Chen Mian Shu
Published: September 2013

The algorithm of adaptive loop filter based on flexible quad tree (Q-ALF) is put forward targeting the problem that deblocking loop filter used by H.264/AVC cant further improve video coding quality. This algorithm, through the original image and the image after deblocking filter, works out wiener filter and selects a wiener filter with optimal size by taking the SAD of the image after Wiener filtering and the original image as RDO cost and based on RDO model, then uses this filter to filtrate the area that needs filtration. Simulation result shows that Q-ALF algorithm can improve the PSNR of the reconstructed image and decrease bit rate; meanwhile, Q-ALF algorithm can better eliminate blocking effect, improving the subjective performance of the reconstructed image.
Research on Panorama Generation Based on Homography Estimation
Authors: Ying Jie , Song Yan Bin , Lu Lin Li
Published: September 2013

An improved panorama generation method based on homography estimation was proposed. Corners detection were realized using FAST algorithm. After corner detection, the related corners were matched and homography estimation was established. Using random sample consensus related estimation, we got accurate interior points to estimate parameters. Image fusion was realized using hybrid filter operator. Experimental results showed that the panorama generation method based on homography estimation is effective and robust.
Faulty Insulator Diagnosis for UAV Videos Based on Repetitiveness Feature
Authors: Lin Lan , Li Bing Feng , Wang Ling , Cong Yang , Tang Yan Dong
Published: September 2013

In this paper, we proposed a faulty insulator diagnosis method for insulator faulty detection based on repetitiveness feature from UAV video sequence. The repetitiveness feature which describes the relationship of each structural element of insulator is employed for the insulator faulty diagnosis, and is robust to noise, camera motivation and complex backgrounds. Base on the repetition of structural element, our method can not only deal with single insulator with multi-faults, but also work on double insulator strings. The recognition results on insulator dataset and UAV video show the effectiveness of our method.
Design of High Power RGB White Light Emitting Diodes
Authors: Chen Wei , Wang Lang , Yang Lian Qiao , Zhang Jian Hua
Published: September 2013

In this paper, thermal performance of RGB white LED packages was optimized by thermal simulation using the Finite Volume method. A Monte Carlo photon simulation method was utilized for the analysis of optical performance of LED in quantitative terms. It was found that the distribution of RGB chips has great effect both on the thermal and optical performance of the RGB white LEDs. The tilted angle, material of the reflection cup, and the shape of encapsulant were found to be the key factors which determine the extraction efficiency of LED package. It is demonstrated that the combination of optical and thermal simulation provides a comprehensive optimization approach for a design of high efficient RGB white LED package.
The Application of Data Radio Broadcasting Station Base on GPRS
Authors: Zheng Feng , Lu Han Rong , Guo Le Jiang
Published: September 2013

Data transmission networks based on GPRS has become a rapid rising data transmission way with its high reliability, networking convenience, low costs and other advantages. Advanced communications systems also involve a digital data radio communication technique as a promising technology that may bring many benefits to the communication community. This article makes a comprehensive comparison and analysis on the transport mechanism, networking and many other aspects, providing a network promotion scheme from data radio based on GPRS.
Ethernet Controller and Serial Interface Conversion Technology Based on FPGA
Authors: Zhang Jie Fei , Zhan Peng Fei , Zhang Gang
Published: September 2013

The FPGA-based 10/100M Ethernet MAC controller and universal asynchronous serial communication controller are designed and connected on chip in this paper. Such functions as writing data transmitted by the serial interface to the Ethernet controller and sending them to the network, and serially outputting network data received by the Ethernet controller are implemented and interconnection communications between Ethernet and the serial are achieved, possessing great practical values in system test. Modularization design is performed on the whole system with VHDL in this study, whose hardware application is verified on Xilinx Virtex2P XC2VP30 development board. The simulation results prove that the design has reliability, stability and good applications in the data transmission test.
Analysis of a New Design of FSS
Authors: Song Yi Chao , Tan Kang Bo , Wang Xiang Ping , Su Tao , Lu Hong Min
Published: September 2013

In this article, a new structure of dual band pass FSS is simulated and analyzed. The improved FSS structure, which satisfies the requirement of miniature, is much simpler than traditional one and has lower working frequency band, and it provides a new way to solving the problem of the coupling effect of dual bands. Besides, its response towards electric field is invariant. The response has no obvious change when the incident angles change a lot.
Dynamic Delegation Approach in the Electronic Evidence Storage of Cloud Platform
Authors: Wang Yan Fei , Xie Jun , Xian Zheng Guang
Published: September 2013

The trustworthiness of the web resources is very important for secure cloud platform of electronic evidence storage calculation. In this paper, I analyzed the possibility of classes of delegation and trust level of authorization access. I used CGRS resource selection algorithm which is based on the K-means clustering algorithm in digital forensics analysis of cloud platform resources, and the algorithm is used to scalable environment for digital forensics analysis platform in substantive departments. The algorithm is proved effective and correct by the analysis and the experimental results.
Buddy Algorithm Optimization in Linux Memory Management
Authors: Meng Zhao Fei , Zhang Shu Dong
Published: September 2013

Buddy algorithm is one of the classical algorithms for Linux Memory Management. In buddy algorithm, free memory blocks, even if they have the same size and consecutive address, they cant be combined into a larger memory space because they dont have a partnership. For these shortcomings of the algorithm, this paper proposes an improved buddy algorithm which mainly include in the main data structure adding an array and a variable respectively to record the starting address and the number of two adjacent free memory blocks which are in the linked list of last order and do not meet the partnership, at the same time, improving memory allocation management and memory recovery management.By experiment, when the memory space is insufficient and memory allocation request is frequent, the improved algorithm can effectively reduce the number of failed memory requests and improve the memory utilization.
Design and Simulation of Five-Fingered Hand with Linkage Mechanism
Authors: Yin Bao Lin , Yan Bing Bing , Wang Jun Fa
Published: September 2013

In this paper, the five-fingered hand with linkage mechanism is presented. Four-link mechanisms are used in the design of the finger. Based on the analysis on the geometrical constraint to linkage mechanisms and mechanically coupled, the mathematical model of the linkage parameters for the finger is obtained. An example is given, and motion simulation is carried out, which demonstrate the effectiveness of the mathematical model.
Full Software CNC System Based on RTLinux
Authors: Wang Kun Qi , Liu Le , Fan Jing Qi , Yang Bao Chen
Published: September 2013

In order to meet the real-time performance of the full software CNC system, the full software CNC based on RTLinux is designed. Linux+RTLinux system is used as development platform, the timer parameter is changed by the method of hardware interrupt, and the real-time requirement of the CNC system is solved. The idea of modular design is used on CNC system to divide the function module, and the software design of the full software CNC system based on RTLinux is completed. C language is used as the main development language, the development of functional modules of the system management layer and the control layer is realized. Linear, circular interpolation function of CNC system can be realized.
Research on High Power Direct Drive Differential Volume Control Electro-Hydraulic Servo System
Authors: Zhang Zhu Xin , Xu Xin Yun
Published: September 2013

For traditional direct drive volume control electro-hydraulic servo system, the servo motors rotary inertia is limited strictly, the speed of response is slow and the actuators reciprocating motion characteristics are not consistent. In order to solve these problems, this paper designs a kind of high power direct drive differential volume control electro-hydraulic servo system. It is instructive for design of hydraulic system which demands high output power, changes direction of motion frequently, needs high response frequency and requires the speed of reciprocating motion keep consistent.
Freeway Ramp Metering Based on Cell Transmission Model and Single Neuron
Authors: Ye Yan Di , Liu Yan Yan , Liang Xin Rong , Dong Chao Jun
Published: September 2013

In this work, we apply single neuron method to relieve freeway traffic congestion. We consider a freeway composed of cells and entry/exit ramps, and formulate the ramp metering problem as a density tracking process. The cell transmission model (CTM) is firstly formulated and ramp control objective is determined. Based on CTM and single neuron, a freeway ramp metering system is then designed, and the learning algorithm of single neuron is given in detail. Finally, the ramp metering system is simulated in MATLAB software. The results show that this method can effectively deal with this class of control problem, and can achieve a perfect density tracking performance. This ramp metering can eliminate traffic congestion and maintain traffic flow stability.
Dynamic Infrared Scene Simulation Study Based on DMD Imaging System
Authors: Ding Yi Yuan , Xiao Shu Chen
Published: September 2013

Dynamic infrared scene generator is one of the important means to test the detection,track and anti-interference performance of the infrared seeker. The article to a certain type of air-to-air missile seeker loop simulation application object, based on the micro-mirror array (DMD), Vega Prime software and its infrared module for the development of tools,Real-time infrared images with vary objects and backgrounds in different conditions are generated to simulate the infrared radiation at the pupil of the guide system.The radiation of blackbody is reflected and modulated by digital micro mirror device based on infrared video signal,which is used to test and evaluate the performance of infrared seeker.The results indicate that the system has the advantages of compact structure,high real-time performance,high frame frequency,high resolution,and great dynamic range.
Benchmarking the Industrial Expectations of Civil Engineering Students through Internship Placements
Authors: Leong Lau Teck , Goh Boon Hoe , Liew Chung Lian , Choong Wee Kang
Published: September 2013

In view of the importance of undergraduate students professional attributes development in higher education, this study was conducted in order to investigate the effectiveness and relevancy of the two years undergraduate studies pre-requisite for industrial internships. The outcomes indicate that the two years conducing learning environments provided have been effective in stimulating cognitive learning and motivate students for ethical practice that fulfilled the industrial expectations.
Java Course Teaching System Based on Practice and Innovation Ability Training
Authors: Yang Li Ping , Wang Wei
Published: September 2013

This paper introduced the framework of the lightweight J2EE based on Struts2+Spring+Hibernate (SSH),and then discussed the application to the design of the Java course teaching system based on practice and innovation ability training by the integration of the three technologies. This paper introduced the system architecture,functions and development process.
Study on Evaluation Methods of Disciplines in Universities
Authors: Rao Cong Jun
Published: September 2013

The level and status of disciplines are the important indexes in universities. The evaluation of multiple disciplines plays an important role in the disciplines development. This paper mainly studied the problem of disciplines evaluation in higher education. Firstly, it established the evaluation index system with eight first-grade evaluation indexes, i.e., discipline construction, teaching award, research funding, the scientific research achievement award, team construction, scientific research, talent training, and initial investment, and then used the method of Analytic Hierarchy Process (AHP) to solve the weight of each index. Thirdly, it established a disciplinary evaluation model based on fuzzy comprehensive evaluation method, and analyzed the rationality of the model. The study in this paper provides a new way for the evaluation of university disciplines.
Study on Adhesion Properties of Poly (sodium acrylate)-Polyvinyl Alcohol Super Absorbent Resin
Authors: Du Zhi Hong , Huang Hong Jun , Wan Hong Jing , Jiang Lei , Wan Guo Shun
Published: September 2013

A poly (sodium acrylate)-polyvinyl alcohol superabsorbent resin is synthesized from acrylic acid (AA) and polyvinyl alcohol. A new method is established to measure the adhesion properties. Then the influence of different experimental conditions on the adhesion properties of the resin is discussed. The results indicate that the adhesion properties of super absorbent resin have some variation with the water absorption increased, the initial pressure and the separation rate. It can be explained by the theory of polymer structure, mechanical interlock and stress relaxation.