bluuebunny/crossref_metadata_2025 huggingface dataset:
The Spectral Analysis of Vibration Signal on Wire Bonder
Authors: Lu Xue Jun , Wang Zhi Gao
Published: September 2011

This paper discusses the method of vibration spectral analysis to get characters of wire bonder, based on the work principle and character of wire bonder. Vibration signals are acquired by vibration sensors, and Dewetron data-acquisition system has been used for the data analysis to get spectrum. From the spectrum of vibration signal, the main frequency and corresponding amplitude have been acquired. Amplitude of main frequency at different working condition on the same machine is compared by figures. The results show that machine 1&2 has almost the same vibration at the workbench, although machine 2 has bigger local vibration than machine 1. It can be concluded that the much bigger local vibration has less effect on the quality of parts in this case.
Biomechanical Evaluation of Two Rowing Training Methods
Authors: Geng Rui , Li Jian She , Gu Yao Dong
Published: September 2011

This study is trying to find kinematics differences between on-water rowing and its simulation on Concept2 ergometer, and explain biomechanical differences between on-water rowing and its simulation on Concept2 ergometer, which can affect the rowers motor control pattern and their on-water rowing technique. Positions of the handle, seat and trunk, shell acceleration were measured in single scull on both machines and on-water in four female rowers. It was found there is about 60-80% similarity between on-ergo and on-water rowing, the drive length on Concept2 ergometer is 10%-12% shorter than on-water, the stroke rate on-water is 10-15% higher than on Concept2 ergometer, legs drive was 4-6% longer on Concept2 ergometer than on-water. Significant differences were found in the handle velocity and shell acceleration profiles. Machines should be considered as a cross-training for rowers and can’t replace on-water rowing.
Wave Propagation Modeling in One-Dimension Structures by the B-Spline Wavelet on Interval Finite Element
Authors: Yang Zhi Bo , Chen Xue Feng , Zhang Xing Wu , He Zheng Jia
Published: September 2011

The conventional modal methods become inefficient when expanded to the high frequency region. This leads to a large number of degrees of freedom (DOF) even for one-dimension structures. Meanwhile, a short computational time is also the requirement of on-line structural health monitoring. This paper presented an application of B-spline wavelet on interval (BSWI) finite element for one-dimension elastic wave propagation problems. By using central difference method in time domain, numerical results involving wave propagations in crack free rod and beam were obtained and compared with results calculated by classical finite element method. Numerical examples validated the good performance of BSWI. BSWI could provide a accurate and efficient solution for wave propagation problems. The proposed method provides a good reference for structural health monitoring.
Research on Dynamic Response with Complicated Structure System
Authors: Qiang Yue , Jian He , Li Li
Published: September 2011

With the complex high-rise and extra-high buildings construction, dynamic characteristics of these structures are more and more paying close attention and researching. At the same time, the dynamic response of high-rise building with complicated structure system is always a hot and difficult research, and it is going to be further developed on the research of dynamic features, displacement and internal force. Selecting a complicated systematical structure of a city, using finite element to establish the model and inputting rare earthquake wave, this paper carried out an analysis on the natural vibration characteristics, relative storey displacement and maximum shear of the structure by applying dynamic elastoplastic time history analysis method, drawing the conclusion that the structure design is safe and putting forward the corresponding improvement measures.
On the Basis of Fuzzy and PID Double Control of Honing Machine Reciprocating Motion
Authors: Zhao Jia Li , Chen Shan Shan , Hu Chi Bing , Gong Jun
Published: September 2011

As the improvement of honing velocity, acceleration and accuracy, corresponding requirements about control technology are put forward to meet the improvement of high machining efficiency. While the honing machine spindle reciprocating reversing control is the key control link, directly affects the ability of the machine abilities and quality. Aim at the traditional honing machine reciprocating motion cannot satisfy the requirement of high speed, high acceleration and high reversing accuracy. According to the characteristics of honing machine mechanism of reciprocating movement, establish its mathematic model and the system of fuzzy and PID double control model, and then the control system was conducted by using the tool of Simulink. The simulation result showed that using fuzzy and PID double control can make overshoots reduced compared with conventional single fuzzy control and PID control, and can well satisfied the system performance index.
Flutter Analysis of Hypersonic Wings Subject to Thermal Load
Authors: Niu Yao Bin , Wang Zhong Wei
Published: September 2011

Aeroelastic analysis plays a vital role in the design of hypersonic wings. The thermal flutter of hypersonic tail under different materials at different temperature is analyzed by using MSC.NASTRAN, and the hypersonic piston theory is used for the modeling of supersonic aerodynamic loads. The research results showed: nature frequency is reduced as temperature increased, elevated temperature tend to reduce model stiffness due to changes in material properties and development of thermal stresses. Increased temperature will decrease the flutter velocity, flutter speed of tail is different with different material of titanium, but the trend and the value of variety of flutter speed are same as temperature increase. When material is different, the value of variety of flutter speed is also different.
Study on Dynamic Simulation of 4-Bundle Ice-Coated Conductor Galloping Based on 3-D Model
Authors: Wu Shi Jing , Zhang Zeng Lei , Liu Zhen Hao , Hu Ji Cai
Published: September 2011

Galloping of power transmission lines is a low frequency self-oscillation with large amplitude. The aerodynamic effect on each sub-conductor of 4-bundle conductor is different due to wake-flow-influence. In order to explore the reasons leading to galloping, a 3-D model for power transmission line is built. A two-node quadratic beam element in 3-D and a structure mass element are applied to establish the finite element model of iced 4-bundle conductor in ANSYS software. Then dynamic transient response calculations are made on this model. According to the results, difference in vibration of sub-conductors and frequency coupling of torsional and transverse vibration can be confirmed. The simulation results illustrate the wake-flow-influence effect and the coupled motions effect on galloping of 4-bundle conductor.
Application of Terrain Data Management in Driving Simulator
Authors: Tang Fang , Zhou Xiao Jun , Wei Yan Ding , Li Pei Xin
Published: September 2011

Fidelity of vehicle dynamics is directly affected by virtual terrain data in driving simulator, in order to satisfy both high fidelity and simulation frame rate, management of high resolution terrain data is necessary. Vehicle dynamics process and terrain data triangle grid structure are introduced firstly, then a data management algorithm is described, whole terrain data is divided into small terrain blocks identified by their row and column, according to driver’s view range, blocks around vehicle position are loaded rather than all terrain data, therefore dynamics calculation efficiency and simulation frame rate are improved. Finally, a simple driving simulator is created to test effect of this algorithm, the results show it is feasible and valid for driving simulator.
Quasi-Steady Marching-on in Time Approximation Technique of Numerical Simulation of Wind Pressures on Building
Authors: Yu Zhi Xiang , Yan Yan Jun , Wu Hao
Published: September 2011

Abstract. In order to improve the convergence of nonlinear simulation of wind pressure on buildings by turbulence theory pattern, QSMA technique is proposed based on full implicit marching-on in time method in CFX. During marching-on in time, the unit time step and non-convergence tolerance test are employed to approximate the steady state solution in this technique. Comparing with the traditional method, the proposed technique can reduce the restriction for time step and requirement for the target tolerance significantly. It is mathematically proved that the time discretization scheme is stable and the error transfer tends to zero with QSMA technique. Through numerical analysis for flow around Marakami 3D cubic, the research result indicates that solution accuracy and time consumption of QSMA are consistent with traditional steady state method, but the convergence is better.
The Study of the Correlation between Technical Standard and Administrative Decree Based on System Dynamics
Authors: Yin Qin , Dong Bo
Published: September 2011

According to the statistics and analysis of the situation that administrative decrees reference technical standard, this paper find that there are several conclusive interactive relations between these two terms. Paper simulate the inner mechanism of the relationship between technical standard and administrative decree in the way of system dynamics and identify the key factors which has great impact on the correlation, point that there are three associated states of "strong, weak, zero" between technical standard and administrative decree and give the way of how to define them. Finally it makes a conclusion in the paper that we should construct an appropriate correlation depending on their needs.
On the Applicability of New Symplectic Approach for Exact Bending Solutions of Moderately Thick Rectangular Plate
Authors: Hu Bo , Li Rui
Published: September 2011

The exact bending solutions of moderately thick rectangular plates with two opposite sides simply supported are derived based on the symplectic geometry method. The basic equations for the plates are transferred into Hamilton canonical equations. Then the whole state variables are separated. According to the method of eigenfunction expansion in the symplectic geometry, the exact bending solutions of the plates are obtained. Since only the basic elasticity equations of the plates are used and there is no need to select the deformation functions arbitrarily, the approach utilized is completely reasonable.
The Finite Element Analysis and Optimization for the Steel Structure of Gantry Bucket Wheel Stacker-Reclaimer
Authors: Zhou Zhen Ping , Jiang Di , Li Jia Liang
Published: September 2011

Gantry bucket wheel stacker-reclaimer belongs to large complex steel structure. Once it is instability at the working time that will make a large accident. So we have to calculate its strength and stiffness. But its connection and the working condition are very complex. And the size of the model is so large which leads to debase the calculation efficiency. This paper use Pro/E software to create the model. And use Pro/Mechanical to make a finite element analysis. Through the properly simplified the model, we can increase the calculation efficiency. During the calculation result we find that the Pulley yoke, Rigid leg and Flexible leg appear big stress areas. We will give an optimization design for the irrational place and high stress areas. So that to improve the Gantry bucket wheel stacker-reclaimer on-site safety. And provide a certain reference for the subsequent design and improvement.
Blast Wave Effect on Apparatus and Propagation Laws in Dry Sand in Geotechnical Centrifuge Model Tests
Authors: Fan Yi Kai , Liang Xiang Qian , Huang Xin , Zhang Xue Dong
Published: September 2011

7 geotechnical centrifuge model tests for buried explosion in dry sand were investigated by using 450 g-t geotechnical centrifuge apparatus. Blast wave effect on apparatus and propagation laws in dry sand were studied under the conditions of different explosive charges and different centrifuge acceleration levels. 11 accelerometers were buried around the explosives for recording the acceleration response in sand. Other 1 accelerometer was installed on the centrifuge arm to monitor blast wave effect on centrifuge apparatus. The results demonstrate that: The effect of blast wave on centrifuge apparatus can be ignored. The peak acceleration is a power increasing function of the acceleration level. An empirical relation of exponent can be found between the proportional peak acceleration and the proportional distance.
Real-Time Monitoring Method for Five-Degrees-of-Freedom of the Extruder’s Moving Parts
Authors: Wang Xian , Tan Jian Ping , Quan Ling Yun , Cheng Xiao Le
Published: September 2011

On the basis of systematic study on the existing measurement methods of multi-degrees-of-freedom, A real-time monitoring method for five-degrees-of-freedom of the extruder’s moving parts was proposed based on laser beam measurement reference and machine vision. Simultaneously measuring multi-degrees-of-freedom is implemented by two-collimated laser beam and three-point measurement in this method, laser dispersion technology is used for several measuring points using the same basis simultaneously, the baseline errors are initial adjusted and real-time monitored, the method of machine vision is used for precise extraction of the position signals. Position signals are collected and selected by a Charge Coupled Device (CCD) sensor and a high speed Digital Signal Processor (DSP), long-distance propagation and reconciliation of multi-channel data is implemented by an industrial Ethernet. Experiments indicated the method is effective and steady.
Active Vibration Control for the Flexible Spacecraft Structure Based on an ATMD/PPF Strategy
Authors: Li Yang , Qiu Yuan Ying , Peng Fu Jun
Published: September 2011

There are some problems in the control for a large flexible spacecraft on orbit such as the coupling, destabilization, and performance of the control system. To solve the problems, an active tuned mass damper (ATMD) is developed utilizing the piezoelectricity smart material, and an optimal output feedback control strategy is proposed based on the positive position feedback (PPF) method. The numerical simulations show that the developed ATMD/PPF method can suppress the flexible structural vibration induced by disturbances effectively. Using the method, the stability of the control system can be ensured and a good performance can be maintained even in case that the ATMD is in failure.
Vibration Fault Diagnosis of Aero-Engine Rotor System Based on Recurrence Quantification Analysis
Authors: Li Le Xi , Hou Sheng Li , Bo Ren Heng , Qiao Li , Wang Tao
Published: September 2011

Aero-engine rotor system is the core component of engine. Aim at difficulties of fault diagnosis of engine rotor system, a method to detect the fault feature is proposed, which is based on recurrence plot (RP) and recurrence quantification analysis(RQA) by research of the characteristics and the mechanism of faults. An experiment is used to detect the fault of rotor system by using this new method. The results showed that the RQA is an effective way to extract features from vibration signal and by the use of quantitative features it is possible to identify and classify different types of rotor. Comparing with classical statistical features, the proposed algorithm has better classification rate. The research will be helpful in the further study of fault diagnosis of rotor system.
Real-Time Model Method Research in Ship Pipeline System Leakage Detecting
Authors: Yin Hong Hao , Chen Hui , Peng Zhong Bo
Published: September 2011

Leakage of ship pipeline system has become a great hidden danger, which affects safe operation of ship and causes environmental pollution. In order to isolate leaking pipeline safely in emergency conditions, Real-time monitoring of ship pipeline system leakage is very important. In this paper, the real-time models of ship isothermal and thermal pipeline were established with a set of equations which is running synchronized with the actual execution pipeline, and the real-time model method was used to monitor ship pipeline system leakage. If the difference between measured values and calculated values is greater than a certain range, pipeline leakage is identified. The location of leakage is calculated based on pressure gradient. Only pressure, flow and temperature of the first and second end of the pipeline were needed, can this method achieve leakage detecting and locating. According to the analysis and verification from the experimental data, this method has high leakage resolution and positioning accuracy.
Research on Active Control of Driver’s Seat Suspension System
Authors: Pan Gong Yu , Hao Xue Ling
Published: September 2011

In order to improve the driver confortness, the 5-DOF analysis mathematical car model with the active seat air-spring suspension system was built. Based on the linear stochastic optimal control theory (LQG), the signal of road’s input as excitation source was used to design the optimal law of this seat active control system. MATLAB simulation programming language was applicated for the response simulation. The results show that the control strategy on the road excitation system has a good applicability on controlling the vibration of the driver’s seat and active seat suspension can more effectively reduce the driver’s vertical vibration acceleration than passive seat suspension.
Active Vibration Isolation System for Free Space Optic Communication: Virtual Prototyping Using LabVIEW-SolidWorks
Authors: Rahim Syazwani A. , Muthalif Asan G.A. , Turahim Khairiah K.
Published: September 2011

In Free Space Optic (FSO) communication, the alignment between transmitter and receiver telescope is very important. The line of sight of their optics must be aligned during the entire communication time; this is crutial in large distance data transmission. One of the factors that causes misalignment is vibration, either at the transmitter or the receiver. In this work, active vibration isolation (AVI) system is designed and developed to tackle this issue. An AVI system isolates FSO devices from direct disturbances or ground vibrations. The LQR controller is proposed and implimented with LabVIEW. A mathematical model of the isolator is derived and the prototype model of the AVI system is designed in SolidWorks. This prototype model is integrated with LabVIEW software to perform virtual prototyping.
Research on B/S Mode-Based Rotating Machinery Remote Status Monitoring and Fault Diagnosis System
Authors: Wang Li Guo
Published: September 2011

This paper discusses the composition and structure of B/S mode-based rotating machinery remote status monitoring and fault diagnosis system, builds the system network model, makes detailed introduction of fault diagnosis mode, system hardware composition, software platform and system realization process, and carries out laboratory simulation on the feasibility of remote monitoring diagnostic system.
Effect of Fire on Self-Excited Vibration Characteristic of Composite Beams of the Overall Structure
Authors: Lv Jun Li , Dong Yu Li , Sun Jian Dong
Published: September 2011

The study shows that, the vibration of structures and members has very obvious self-excited vibration characteristic under the action of fire. Random signals for acceleration distribution of composite beams of the overall structure under the action of fire are collected and auto-spectrum analyzed in this paper. The result shows that: the fire causes self-excited vibration of composite beams of the overall structure. As the internal forces cause re-distribution and structure connections are damaged, amplitude, frequency and vibration characteristic excited by external forces of composite beams are different, and fluctuating decrease occurs to vibration frequency of composite beam in the test. Test results provide data support for the establishment of fire vibration theory and healthy detection of structures in case of fire.
Irregular Structure of the Metal Energy Dissipation Wrest Resistant Performance Analysis
Authors: Teng Xiao Fei , Chen Si Yang , Luo Bin
Published: September 2011

To make a top local adding stories of “L” flat facade irregular frame structure with good resistance to twist and integrity, can better satisfy the requirements of local seismic fortification intensity,using metal damper to this after-adding-stories framework model for processing. Using SAP2000 finite element analysis software modeling and in its install metal damper dynamic time-history analysis before and after. Results show that the structure using metal consumption technology in consume earthquake input energy at the same time can enhance structure rigid and floor wrest resistant and strengthen the lateral stiffness integral structure seismic performance.
Reliability Analysis and Numerical Simulation on Time-Dependence of RC Free Beams
Authors: Tan Wen Hui , Pei Yong Gang , Li Da
Published: September 2011

Load effects and resistance are supposed to constant in traditional reliability theory. In fact, load effects and resistances change with time because some influent factors of structures change in long working life. Thus, only structures are safe at every moment in working life are structures safe. A synthetical method of qualitative and quantitative analysis is proposed in this paper to study the time-dependence problem of a RC free beam. Firstly, the time-dependence character of a free beam is simulated by ANSYS program. Then, a time-dependent reliability model of the free beam is established, and a program is edited to get values of resistance and index of reliability in different years, thus, the time-dependent reliability of the RC free beam is assessed. The results showed that the value of the resistance decreased 20 percent and the reliability index cut half down after 50 years, so time-dependence should be considered to achieve correct results when the reliability of in-service structures is estimated and new structures are designed.
Analysis of Creep Characteristics of Shallow Mined-Out Areas Roof under Low Stress Conditions
Authors: Wang Shu Ren , Jia Hui Hui
Published: September 2011

Under low stress conditions, when the load exerting on the mined-out areas roof is less than the rock long-term strength, the rock roof will generate some creep deformation. In order to prevent the roof of the mined-out areas suddenly collapse, and to ensure the operator and construction equipment above the mined-out areas safety, it is an important security technical problem to reveal the creep characteristics of the shallow mined-out areas roof. Taking the mined-out areas of Antaibao Surface Mine as background, considering the rheological properties of rock roof, and assuming the roof was a rectangular thick plate, the creep characteristics of mined-out areas roof were analysed by applying the thick plate theory and Kelvin creep model. The regression equation of the roof deflection increment over time was given, and the creep characteristics of the shallow mined-out areas roof were revealed also.
Curved Box-Girders with Corrugated Steel Webs under Torsion Loading
Authors: Yang Bing Wen , Zhang Jian Dong , Wan Shui
Published: September 2011

It is known that coupled bending and torsional effect is a distinct characteristic of curved girders. According to mechanical characteristics of box girders with corrugated steel webs and theory of box girders, warping normal stress of box girders with corrugated steel webs caused by Torsion Loading is studied. On the basis of second theory of Wu, restrained torsion differential equation of box-girders with corrugated steel webs is proposed. Corrugated webs are assumed as orthotropic plates. Constraint torsional normal stress and shear stress are deduced using Initial parameters method. The results demonstrate that the method is more accurate compared with conventional ones, and it is connected with existing bridge calculation theory. The method is then a practical one in this respect.
An Study on the Flexural Performance of Reninforced Concrete Beams Considering Loading History with Pre-Stressed Cfrp Sheets
Authors: Li Zhe , Li Gang , Zhao Qin , Zhang Shuai
Published: September 2011

For the effect of nonpre-stressed carbon fiber reinforced polymer (CFRP) Sheet Strengthening concrete beams to improve bending stiffness and crack resistance is not satisfactory, and it is difficult to totally unloading on the actual reinforcement, so in this paper, ANSYS is used to research the strengthened effectiveness and impact factors of pre-stressed CFRP reinforced concrete beams considering the secondary load.
Analysis and Computation Method of Prestressed Concrete Bridge in Construction Control
Authors: Tan Sui , Yu Zhi Wu , Zhang Hua Shuai
Published: September 2011

Based on solving the problems of pre-camber of the prestressed concrete bridge in construction, the calculation principle of the bridge model constructed in each stage is studied, the relation between forward and backward analysis method is illustrated, and the influencing factors related to characteristics of pre-camber and each controlled point are analyzed. Considering the influencing factors such as the establishment of new elements, the stressing of reinforcement, the shrinkage and creep of concrete in construction, the calculation model is established in accordance with the characteristics of prestressed concrete bridge constructed in each stage. The deformation of each construction segment is calculated with the forward and backward analysis method respectively, so that the pre-camber of each cantilever construction segment is gotten,which is the basis of construction control.
Theoretical Analysis and Model Experimental Research on Single-Layer Hyperbolic Paraboloid Latticed Shell
Authors: Deng Peng , Wang Lai , Han Na
Published: September 2011

Single-layer hyperbolic paraboloidal latticed shell dome is adopted in the gymnasium of China University of Petroleum. And the center part of the dome employs crossed web bars in order to increase stiffness of the structure. The 1:12 scale model has been made according to the construction drawings, and the mechanical properties of the model are studied under self-weight load and design load. The regularity of the members' axial force and joints' displacements are obtained. And the results show that the deflection of dome under design load conforms to the requirement of specifications, which verified the correctness of the structure design. It is found that there is no overall instability and local instability, and the behavior of the structure is almost linear.
Optimal Design of Double Bottom Structure Filled with Liquid Resisting Underwater Explosion
Authors: Tang Ting , Wang Li Jun , Ma Jin Bo
Published: September 2011

Liquid filled double bottom structure is a usual type for large surface vessel, so the optimal design of which has important significance for viability of vessels in war. Appling a FEM process of MSC.Dytan, and changing the depth of liquid cabins, the thickness of bottoms and the thickness of stiffening, the response of different double bottom structures to underwater explosion were studied. After comparing and analyzing the deformation, the optimal design method of double bottom structures filled with liquid resisting underwater explosion was achieved. The best depth of water in water cabins is 90%, the best ratio of thickness of inner bottom and outer bottom is 11/9, and the stiffening should be thicker than outer bottom and thinner than inner bottom.
Chloride Binding of Self-Compacting Concrete with Different Crack Depths under Electric Migration Test
Authors: Mu Song , Ma Bao Guo , de Schutter Geert , Jian Shou Wei
Published: September 2011

Cracks can form a shortcut for transport of chloride ions in concrete structure, and provide more opportunities for chloride ions to contact and bind with cement matrix. Following the NT BUILD 492 chloride migration test method, chloride content were determined on cracked concrete samples which were prepared by artificial crack method. The results shows crack depth increased from 0 mm to 31.4 mm almost did not exert pronounced effects on chloride binding of concrete under the migration test.Besides, the binding parameter of linear binding isotherms almost did not change.
Study on the Distributed and Non-Stationary Dynamic Load Being Transformed into Several Equivalent Centralized Loads for Aerocraft
Authors: Chang Xiao Tong , Yan Yun Ju
Published: September 2011

Missiles always undergo non-stationary and continuously distributed load. However, only some centralized loads can be adopted in the ground for their vibration experiments. In this paper, the theoretical analysis and numerical simulation computations programs are established for the distributed and non-stationary airdynamic load being translated into several equivalent centralized loads for high-speed missile. The researches showed that, under the equivalent rule of structural modal responses, the average responses error in both domains time and frequency is within 1.5dB, so it is possible to provide a feasible method for the vibration test on the ground for missile structures.
Based on Spectral Analysis of Voice Controllable Surveillance System Using Normalized Mean Square Error
Authors: Jakub Peksinski , Grzegorz Mikolajczak
Published: September 2011

In the article the authors present an algorithm to recognize the human voice, whose operation is based on the analysis of spectra using a measure of the quality of NMSE (normalized mean square error) used to compare digital images. Proposed in the article of voice recognition algorithm has been applied practically to voice control a visual surveillance system.
Improved Electroluminescence from nc-Si Film Embedded in p-i-n Structure LED
Authors: Ma Z.Y. , Xia G.Y. , Jiang X.F. , Li W. , Xu L. , Chen K.J. , Feng D.
Published: September 2011

Intensive electroluminescence (EL) visible to the naked eyes is observed from p–i–n structure light emitting diodes with nanocrystalline Si (nc-Si) film as the luminescent layer. It is found the luminescence intensity increases by 20 times compared with that of nc-Si film without p-i-n structure and the turn-on voltage is sharply reduced. Combined with I-V and TEM analysis, the improved EL is attributed to the enhancement of carrier injection probability of nc-Si inserted in p-i-n structure.
Treatment of Dye Wastewater by Zero Valent Iron Composited Organobentonite
Authors: Ma Jian Feng , Yu Jian Ming , Cui Bing Ying , Li Ding Long , Dai Juan
Published: September 2011

A novel material, zero valent iron composited organobentonite (NZVI-OB), was synthesized to adsorb dye from wastewater and to degrade the dye for avoiding secondary pollution. The crystal structure was characterized with X-ray diffraction (XRD). The effect of initial Orange II concentration and reaction time on the removal of Orange II by the NZVI-OB was studied. And the removal mechanism of Orange II was discussed. The results show that the Orange II can be removed by NZVI-OB efficiently. The maximal adsorption amount is 112.66 mg/g. The iron can effectively degrade the organic compounds after adsorption pollution, the carbon contents of organic pollutions after catalyzed and oxidized by the iron are lowered to the 19% of the original.
A Localization and Extraction Method Research for Phalange ROI and Carpal ROI from Left Hand Radiography
Authors: Ran Long Ke , He Ling , Chen Zhong
Published: September 2011

In the research of Automatic bone age assessment,the most efficient location and successful extraction of regions of interest(ROI) from hand radiographs is one of the most difficult and important key technologies. Based on using shape information for phalanges and carpals, a background prediction method is propoesd , which uses a two-dimensional third order polynomial linear regression to fit background. And we also localize the key points of carpal and phalange ROI by usingK-cosine algorithm, finally we extract the carpal and phalange ROI successfully and properly. Through experiments, the proposed method resulted in over 93% correct extraction from more than 60 left hand radiograph data. The proposed method is robust to gray value variation of background and the position and orientation of the hand, so it can be used directly for automatic bone age assessment in the following study.
Isolation and Identification of Ammonibacteria and Ammoniation Characteristic Analysis
Authors: Zhang Wen Yi , Tan Fang Yuan , Zhao Ting Ting , Lu Li Qiao , Han Ning
Published: September 2011

Two strains of T1, Z1 ammonibacterium were isolated from the biofilm of the BAF reactor. According to the morphologic observation and physiological biochemistry test, the strains T1, Z1 were preliminarily identified asProteusandMicrococcus respectively. The research of the strains T1, Z1 for ammoniation characteristics indicated that the suitable temperature was 30°C, the suitable pH value was 7.0 and the best inoculum quantity was 5%. The strain T1 was strictly aerobic bacteria and Z1 was facultative aerobic bacteria. In these operating parameters, two strains of T1, Z1 were good of the degradation of organic nitrogen and the growth rate of ammonia nitrogen could respectively reach up to 86.91% and 69.98%. The strains T1, Z1 had a certainly practical value for treating the waste water with the high concentration of organic nitrogen.
Studies on SiO2/TiO2 Complex Film of the Filter Material Carrier and its Photocatalytic Features
Authors: Zhang Wen Yi , Han Ning , Yao Li Rong , Fan Pei Cheng , Chen Rong
Published: September 2011

The nano-SiO2/TiO2complex film was used to implement modification of the surface on the sintered filter material of coal refuse. In the photocatalytic reactor, methyl orange was taken as the response substrate to test the photocatalytic activity and the influence of the different Si/Ti ratios of the complex film on the photocatalytic activity of modified filter material. The Langmuir-Hinshelwood dynamics model was applied to describe the dynamic process during which multiphase photocatalytic modified filter material disassembled the methyl orange. The results indicated that the initial concentration, pH value, aeration illumination condition and the Si/Ti ratios of the complex film were the major influence factors of the efficiency of photocatalytic degeneration. In the acidic environment, and on the illumination and aeration conditions, when the initial concentration of the methyl orange solution was 6mg/L and the Si/Ti ratio was 1/39, the SiO2/TiO2complex film was used to decolor the methyl orange, then the decolorization rate was over 99.8% after 2h.
Study on the Extraction and Purification of Microcystins (MC-LR)
Authors: Zhang Wen Yi , Han Ning , Yao Li Rong , Qiu Xiao Lan , Chen Xiao Liang
Published: September 2011

The MC-LR from the the blue-green algae of Taihu Lake was extracted, at the same time, a set of microcystins extraction method with methanol as extraction solvent and purification method with C18-SPE as purification workstations were established. The extraction solvent concentration, extraction time, extraction solvent amount, leacheate concentration and eluent concentration were used to research the extraction efficiency of MC-LR. Finally, 80% methanol was used to wash microcytins to make MC-LR high purity and the purity was over 85%. This research presented a method of low cost and high efficiency. It provided the foundation for the further research of microcytins.
Deproteinization of Polysaccharide from the Stigma Maydis by Sevag Method
Authors: Li Xia , Zhao Rui , Zhou Hong Li , Wu De Heng
Published: September 2011

The aim of this work is to deproteinize crude polysaccharide from the Stigma maydis by sevag method. According to deproteinization rate and polysaccharide residual rate, the optimized process was deproteinization number (4 times), time of oscillating (11min), the volume ratio of sample to sevag reagent (2:1), the volume ratio of chloroform to n-butyl alcohol (5:1), deproteinization rate was 64.2%, the polysaccharide loss rate was 34.3%, and the purity of polysaccharide was increased from 11.5% to 32.3%.
Treatment of Dye Wastewater by Adsorption with Bentonite-Supported Magnetic Materials
Authors: Chen Xiao Ming , Ma Jian Feng , Li Ding Long
Published: September 2011

Bentonite-supported magnetite particles (MagBt-p) were prepared by co-precipitation. The adsorption capacity of Bentonite-supported magnetic particles on waste water containing OrangeⅡ was tested. Some influence factor such as the dose, the initial concentration of OrangeⅡ, the pH, the contact time and the presence of surfactant were studied. Results showed that cation surfactant (CTAB) greatly enhanced the adsorption of OrangeⅡ. The maximum removal efficiency was 96.6% at 180mg/L (CTAB) and beyond this concentration there was almost no adsorption. Besides, the removal efficiency was affected by pH and contact time, the maximum removal efficiency was found at pH 2.1-3, the adsorption was rapid during the first 120 min and then equilibrium within 180min.
Dynamic Adaptive Weight Multi-Scale and Multi-Structure Morphological Edge Detection in Anterior Chamber OCT Images
Authors: Huang Si Wei , Zhang Ang , Tian Xiao Lin , Sun Yan Kui
Published: September 2011

An edge detection algorithm which is applied to anterior chamber OCT images has been proposed. The algorithm firstly uses multi-structure elements to detect edge on gray level value differences on the same scale, and introduces dynamic adaptive weight to make re-fusion of pixels to gain a multi-structure element morphological edge detection image on the same scale, then confirms weight value and makes multi-scale fusion according to the noise immunity of different scale structure elements to gain the final edge detection image. The simulated results have obvious edge features,it can effectively avoid the occurrence of mutational pixels on the OCT image edge results, compared to traditional edge detection algorithms.
Effect of Functionalized MWCNTs on the Tribological Properties of Polyimide Film
Authors: Liu Lin , Zhu Yun Qing , Song Jing , Chen Si
Published: September 2011

Multi-walled carbon nanotubes (MWCNTs) are incorporated into Polyimide (PI) film in both pristine and functionalized forms through in-situ polymerization. MWCNTs and NH2-MWCNTs lead to improved mechanical properties such as better tensile strength and elongation at break, as well as increased surface friction coefficient. The NH2-MWCNTs can reduce the total wear weight loss of the composite to a larger extent compared with MWCNTs. 1.0 wt% NH2-MWCNTs/PI has the lowest weight loss of 20.6 % of pure PI. Mechanism of two-stage wear procedure is discussed. We found that PI composite films with lower friction coefficient tend to lose less weight in the first stage, and the ones with better mechanical properties show better wear resistance in the whole wear procedure. Owing to the low surface energy, Natural mica is employed as the substrate for PI film.
The Study of Automatic Counting of Coal and Gangue Based on the DaVinci Video Image Processing Technology
Authors: Zhao Yi Ding , Sun Ming Feng
Published: September 2011

In this paper, an image processing and recognition system of the coal and gangue has been studied, which is made up by the chip DM6437 and some peripheral auxiliary equipment. The image processing arithmetic is realized by the CCS programming environment, and loaded into the target board through the simulator XDS510. The system takes advantage of the high performance of the chip to process the real-time image collected by the CCD camera, and makes count of coal and gangue. In this paper, we mainly use the coal and gangue’s trend of contours to make count，and we achieved to make count of the continuous and irregular coal and gangue in the rapid movement of the belt.
The Influence of Gas Metal Arc Welding Parameters on the Carbon Steel ss400 Grade by Using 23 Factorial Design
Authors: Peasura Prachya , Chaisri Mongkol
Published: September 2011

The experimental observation reveals that the influence of gas metal arc welding process on physical properties. The specimen was carbon steel ss400 grade sheet of 6 mm. The experiments with 23 factorial design. The factors used in this study are voltage at 20 and 23 V, travel speed at 5 and 7 mm/sec and wire feed rate were set at 80 and 110 mm/sec. The welded specimens were tested by penetration, width of weld metal and high of weld metal. The result showed that the voltage, travel speed and wire feed rate had interaction on penetration, width of weld metal and high of weld metal at 95% confidential (P value < 0.05). Factors affecting the penetration are the most voltage of 23 V, travel speed 7 mm/sec and wire feed rate 110 mm/sec. were penetration of 31.68 mm. The width of weld metal was most at 9.9 mm. on voltage of 23 V, travel speed 5 mm/sec and wire feed rate 110 mm/sec. The factors affecting the high of weld metal are most voltage of 20 V, travel speed 5 mm/sec and wire feed rate 110 mm/sec. were penetration of 4.51 mm. This research can bring information to the foundation in choosing the appropriate parameters to gas metal arc welding process.
Comparative Experimental Study on Explosion Characteristics of Nano-Aluminum Powder and Common Aluminum Powder in the Explosive Device of a Long Pipeline
Authors: Zhang Chao , Lin Bai Quan , Li Wen Xia , Zhai Cheng , Zhu Chuan Jie
Published: September 2011

In order to study the explosion characteristics of nanometer aluminum, comparative experimental studies on explosion characteristics of nanometer aluminum powder and common aluminum powder with different grain diameters have been carried out by using the horizontal pipeline explosive test device. After analyzing both the explosion process and the data of explosion characteristics of two aluminum powder during the experiment, some explosion characteristics of nanometer aluminum powder different from common aluminum powder can be concluded. Research result expressed: The maximal duration of explosion pressure of nanometer aluminum powder in its explosion process is much longer, which is about 3 to 4 times longer than non-nanometer aluminum; In the nanometer range, the scope of explosion pressure is much wider (between the 40~750kPa) than others, and as a whole, explosion pressure of the nanometer aluminum powder is much higher than the micron aluminum powder; In the process of explosion propagation of aluminum powder, flame combustion wave and explosion pressure wave show the positive feedback mechanism, which is interacting with each other and accelerating each other.
Influence of Temperature and Stress Factors on Warm Compaction Process of Molybdenum Powder Density
Authors: Li Jian , Yang Bin Ting
Published: September 2011

Utilization of finite element method (FEM) and warm compaction process, study on mechanical theory and FEM simulation of molybdenum powder processing. The typical warm compaction process of molybdenum powder was simulated and analyzed with MSC.Marc FEM software. Via calculating, stress field, relative density distribution of molybdenum powder and temperature field were obtained. The result show that when velocity is 5mm/s and pressure is 1000MPa densification is the best. In the molybdenum powder compaction process volume percent of densification zone is 75%.
Smooth GaAs (110) Surface Fabrication Using the Ga-Assisted Deoxidation Method
Authors: Liu Jian Qing , Chen Yong Hai , Xu Bo , Wang Zhan Guo
Published: September 2011

We have practiced the Ga-assisted deoxidation method on GaAs(110) surface. When the deposit amount of Ga is suitable, flat GaAs(110) surface without any thermal deoxidation induced pits and excrescent GaAs islands obtained with the Ga-assisted deoxidation method. The obtained results suggested that, 9ML Ga was optimized dose for GaAs(110) surface, which is a little more than GaAs(001) surface indicating a thicker oxide layer of GaAs(110) surface.
Powder Mixed Micro Electro Discharge Milling of Titanium Alloy: Analysis of Surface Roughness
Authors: Mohammad Yeakub Ali , Adesta Erry Y.T. , Rahman Nur Atiqah Binti Abdul , Aris Erniyati Binti Mohamad
Published: September 2011

This paper presents effects of silicon carbide SiC powder concentration on micro EDM parameters on average surface roughness (Ra). The aim is to achieve minimum Ra value on titanium alloy (Ti-6Al-4V) machined with tungsten electrode for various level of concentration of SiC powder and discharge energy (E). By using two-parameter and four-level factorial design of experiment sixteen experiments were conducted. The measured surface roughness values were analyzed with input parameters using by Design Expert software. The minimum Ra value obtained was 0.75 µm for 16.8 g/L SiC powder concentration and 57.8 µJ energy discharge. The analysis of variance revealed that powder concentration is the most influential parameter.
Automatic Classification of Dayside Aurora in All-Sky Images Using a Multi-Level Texture Feature Representation
Authors: Han Shen Miao , Wu Zhen Sen , Wu Guang Li , Tan Jun
Published: September 2011

In this paper, we propose an aurora classification method using a multi-level feature representation aimed to capture both global and local texture information, and to reduce the feature space dimension substantially. First-order and second-order statistics are computed for an input image and its low-frequency scaled images at three lower levels obtained using wavelet decomposition. The features include gray level distribution, co-occurrence matrix features, and run-length matrix features. A support vector machine (SVM) classifier was trained and tested on a Chinese Arctic Yellow River Station dayside aurora image dataset. Classification performance was evaluated and compared with those of k-nearest neighbor (KNN) classifiers and back-propagation neural networks (BPNN). To explore the possibility of using a smaller feature space, we used a Minimum-Redundancy Max-Relevance feature selection strategy. The result shows that there is only indistinct performance decrease by reducing the feature vector from a total of 88 to the most discriminatory 38 features. This proves that our multi-level feature representation is very robust.
Numerical Simulation on Thixocasting Process of Auto Box-Like
Authors: Dao Van Luu , Zhao Sheng Dun , Lin Wen Jie , Chen Yu Qiu
Published: September 2011

Semi-solid metal processing (thixoforming) is a potential forming technology, which can realize near-net-shape forming process with good quality in one forming step. In this study, semi-solid casting (thixocasting) was used to form the auto box-like. Based on Power Law Cut-Off (PLCO) model and finite element code Procast software, the thixocasting process was modeled and simulated. The impact of main process parameters such as initial billet temperature, ram speed as well as die temperature on the thixocasting process was studied. The results show that thixocasting process can be used in forming auto box-like.
Correlation between Na2SiO3/NaOH Ratio and Fly Ash/Alkaline Activator Ratio to the Strength of Geopolymer
Authors: Al Bakri Abdullah Mohd Mustafa , Kamarudin H. , Ismail Khairul Nizar , Bnhussain M. , Zarina Y. , Rafiza A.R.
Published: September 2011

Geopolymer requires an alkaline activator to induce it pozzolanic property and to accelerate the geopolymerisation process. The geopolymerisation process occurs due to the mixing of fly ash, sodium silicate and sodium hydroxide as the alkaline activator, which produces aluminosilicate gel that acts as a binder. As such, the ratios of fly ash to alkaline activator and Na2SiO3/NaOH play an important role in obtaining desirable compressive strength; the concentration of NaOH used in this study was 12 M. Different ratios of fly ash to alkaline activator (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0) and Na2SiO3/NaOH (0.5, 1.0, 1.5, 2.0, 2.5 and 3.0) were investigated in order to determine the maximum compressive strength. The alkaline activator was mixed with fly ash with different ratio as mentioned above and the samples were cured at 70°C for 24 hours and tested on the seventh day. The maximum compressive strength was obtained when the ratios of fly ash to alkaline activator and Na2SiO3/NaOH were 2.0 and 2.5 with compressive strength 73.86 MPa.