bluuebunny/crossref_metadata_2025 huggingface dataset:
3D Numerical Simulation of Stratified Mixture Formation of DI LPG Engine
Authors: Xu Juan , Zhou Zhong Hai , Hao Zong Rui , Xu Bo Yan
Published: June 2013

Low-carbon economy is a necessary requirement for sustainable development. LPG Direct Injection (DI) method can greatly improve the engines power performance, fuel economy and emission characteristics, hence a new wall-guided combustion system with a specially designed piston cavity used to form lean stratified mixture for DI LPG engine was proposed. In this paper, the stratified mixture formation process of a DI LPG engine was simulated. Before this, the model and method used in the simulation was firstly validated by simulating mixture formation process in an optical engine with conventional piston. The simulation results of the stratified mixture formation showed that, the mixture could gradually move upward along the combustion chamber wall under the guide of the spray induced entrainment vortex and the wall. At the same time, the rich mixture would diffuse to its surroundings. Finally, by the time to ignition, the ignitable stratified lean mixture could be formed.
Simulation of Metal Material Quasi-Static Tensile Test Based on ABAQUS
Authors: Yu Duo Nian , Wang Yuan , She Jun Wei
Published: June 2013

As the rapid development of metal material science, various kinds of metal materials have emerged. The strain and stress characteristics of materials are prerequisites of its application in the actual production. So it has to take many experiments which will cost a lot of manpower, materials, time and equipments to get the characteristics. In this paper, we simulate the process of a metal material quasi-static tensile test based on ABAQUS to discuss the accuracy of simulation data with experimental data. The simulation data is compared with the quasi-static tensile test data of a new kind of aluminum and the verification of accuracy is based on numerical fitting method.
Simulation for Composite Forming Infusion from both inside and outside at same Time
Authors: Du Wei Xiao , Shan Zhong De , Liu Feng
Published: June 2013

Impregnation quality is vital to the whole composite. To improve it a new approach-infusion from both inside and outside at same time is supposed. Some comparison simulation studies, based on PAM-RTM software, are performed in this paper about the new composite forming method and traditional infusion method including flow behavior and filling time. Filling time via the two methods are compared, and the following results are obtained-It takes less time to fill the mold with infusion from both inside and outside at same time than traditional one; higher fiber volume fraction is, more favorable the new forming method is. The new infusion method is proved to be an effective and novel forming method about parts with high-thickness or high fiber content in composite forming area. The results will contribute to researches on the whole composite forming and bring prospect to provide more usages of three dimensional composites in high rank field.
Study on Sports Ecologicalization of Manufacturing Engineering
Authors: Du Xue Gong
Published: June 2013

The paper analyzes and concludes the achievements and characteristics on sports ecologicalization of Manufacturing Engineering. It finds that the quantity soared up the highlights lie in interaction between sport and environment, sports culture ecological development, sports ecology construction, sports ecological resources exploit and school sports teaching ecological exploration. Finally it concludes the characteristics these researches have, such as research methods become diverse gradually, ignore society sports and competitive sports, excellent researches become more but in systematical, researchs topics keep the same meaning although lacking of the same topic special words.
Experimental Study of Pumping and Shunting Pump under Pressure in Water Injection Station
Authors: Shao Dong Bo , Wang Yong , Zhang Sui Wang
Published: June 2013

At present in the process of water injection station operation, starting and stopping the pump caused system pressure fluctuations, and the fluctuations caused many problems about downstream injection wells. In order to eliminate the fluctuations and reduce problems, taking start pump, connect pump test under pressure in the water injection station installed the rotor frequency control system Changqing oil field developed. During the experiment, by progressively increasing the pressure pump to verify start pump with pressure feasibility test , the result shows when the pressure in the 0-25MPa pressure start and connect pump can be realized, and forecast the maximum pressure of the current start of the station with pressure pump. Start pump with pressure achieve the elimination of pressure fluctuations, provide the prerequisites about realizeing stable water injection pressure, and ultimately realize oil field water injection station to be automatic water injection laid a foundation.
Study on Influencing Factors and Improved Measures of Turbine Heat
Authors: Miao Zhi Qiang
Published: June 2013

By the study on the commissioning and performance testing of 600 MW steam turbine unit, this paper gives a detailed analysis of the unreasonable problems of modern large turbine operation mode prevalent in the actual operation and other issues, as well as the impact on the economy of the unit, and some suggestions for improving power plant running.
The Study on the Uniform Drying of Microwave Heating System with Multiple Waveguides
Authors: Che Woo Seong , Ma Jun
Published: June 2013

Microwave heating is an important heating method that is widely used in industries. Developing a uniform electromagnetic field inside the cavities might be a crucial challenge to avoid localized overheating. The uniformity of the electromagnetic field is governed by the configurations of the waveguides. To better understand the design of cavities, the simulations are carried out. This paper discussed the comparison in result between two configurations of waveguides and introduced the use of uniformity objective function in order to evaluate the temperature uniformity. As conclusion, it was found out that using the perpendicular type of waveguides had better uniform temperature than using the parallel type.
Monitoring and Warning System of Highway Environmental Parameters Based on GSM
Authors: Shen Zhuo Jun
Published: June 2013

Mobile network signal is the basic coverage along the highway, and the GSM mobile communication technologies provide a powerful and reliable short message service and data transmission services, a variety of applications based on GSM data transmission platform is also being developed. The paper focuses on highway visibility detection and speed detection, system is constitute of a communication unit that uses the TC35i module and STC89C54 single chip, As well as hardware and software design of the method, GSM precautions in the design process of the highway system are briefly described.
Road Power Generation System Based on Piezoelectric Effect
Authors: Zhang Hao , Song Xin Ran , Feng Jing
Published: June 2013

To meet the needs of the development of new energy sources and demand ,this paper introduces a kind of piezoelectric power generation system design, describes the constitution of a piezoelectric power generation system, and emphatically introduces piezoelectric brick, power conversion and collection system, monitoring system design of the road piezoelectric power generation system. Finally the actual operation results are analyzed and studied. This design has the advantages of energy saving, green and pollution-free which has good development prospect.
Friction Process Analysis and Ring Structure Improvement of Piston Rings in MTU396 Diesel
Authors: Ye Zi Bo , Qu Sheng Guan , Fu Xing Feng , Hu Yong , Wang Guang Hong , Luo Zhong Hui
Published: June 2013

Based on combustion pressure, the dynamic model was established by using AVL Excite Piston and Rings. Relative axial position and wear loss of rectangular piston ring in a work circulation were analyzed. Based on the shape of the rectangular ring outer side after abrasion, the piston ring cross sections were designed to barrel and tapered shape. Results indicate that improved gas rings are suffered substantially decreased friction. The friction of the first gas ring is less than 100N, and the second ring is even less than 20N. At the upper dead point in the compression stroke, the oil film thickness reaches the minimum value and the piston rings do not pump oil to the cylinder combustion chamber.
Overhead Power Line Fault Positioning System
Authors: Dong Ai Hua , Geng Xin Lin , Yang Yi , Su Ying , Li Meng Yao
Published: June 2013

Aimed at the situations of the low accuracy of overhead line fault detection and the high cost of line fault information transmission with the aid of GSM correspondence network, this paper introduces overhead line fault detection and location system as the core of industrial computer. The combination of software and hardware, the methods of current rate of change and zero current detection are used, and so the accuracy of short circuit fault detection is improved. The features of ground phase voltage drop and the 5th harmonic current are integrated, and the accuracy of ground fault detection circuit is improved. Zigbee wireless communication technology is used to make into independent signal transmission system, which not only reduces the system's operating costs but also ensures the reliable transmission of signals. Taking Kingview 6.51 software as development platform, the monitoring program and display with many functions are designed. The system has been put into operation, running in good condition, and passed concluding and acceptance smoothly.
Study on Crushing and Separation of Coal and Gangue
Authors: Xiao Jing Hao
Published: June 2013

In this paper, the pressurization of irregular ores was first discussed so as to make an analysis on the causes for the great difference between measured result and actual ores, and then a preliminary pressure experiment was made on a certain quantity of coal and gangue samples extracted from Du'erping Coal Mine through electronic universal testing machine. Therefore, the selective crushing and separation of coal and gangue was preliminarily tested through the testing machine so as to obtain the selective crushing pressure distribution curves of coal and gangue, and then the curves were drawn based on its numerical distribution. The two curves drawn in this way were placed in the same coordinate, and the optimized control of the separation and selection of coal and gangue was made according to the probability values in the coordinate, so as to find a reasonable pressure boundary value and also prove that the separation and selection of coal and gangue are with certain feasibility.
Design of Current Adjusting Device
Authors: Zhou Lei , Zhao Hong , Zhao Qing
Published: June 2013

The Temperature Rise Test of Low Voltage Switchgear Assembly has rather high requirements for the test equipment; however, the present test equipment commonly has the problem of complicated test circuits, current regulation difficulty, high power consumption etc [. Therefore, in order to raise the present test level, we have devised new test methods and designed a new type of current adjusting device for the Temperature Rise Test. This new type of device has the advantages of easy operation, compact structure, flexible motion, low power consumption, low cost, high precision etc. Practical application has proved that it can meet the technical requirements for the Temperature Rise Test of Low Voltage Switchgear Assembly.
An Intelligent Malfunction Detection System for Ammunition Loading and Feeding Systems of Ammunition Carrier
Authors: Li Ying Shun , Xu Chang Qing , Zou Xiang , Wang De Biao
Published: June 2013

According to the malfunction detection difficulties of the ammunition loading and feeding systems of ammunition carrier in transport, an intelligent malfunction detection system for the ammunition loading and feeding systems of ammunition carrier is designed, so that the automatic and efficient detection on the malfunction of the ammunition loading and feeding systems of ammunition carrier is realized. In this paper, using fuzzy expert system as the basic method of solving fuzzy problems, the overall structure design and hardware design are expounded, and the system is divided into analog signal input module, modulus conversion module, and digital signal input/output module according to the characteristics of input and output signals, and also the design on the software core (fuzzy expert system) of the system is specifically introduced. The results show that the intelligent malfunction detection system for the ammunition loading and feeding systems of ammunition carrier not only can effectively detect the malfunction of the ammunition loading and feeding systems of ammunition carrier, but also can provide an effective method for the precise malfunction diagnosis of the ammunition loading and feeding systems of ammunition carrier, and therefore it owns a wide military application prospect.
Design of Multi-Channel Temperature and Humidity Sensor Acquiring System
Authors: Zang Xue Yan
Published: June 2013

In this paper, the design of remote multi-point temperature and humidity control system consists of two parts of the master and slave, Responsible for the display and control of the host system. Responsible for the collection of temperature data and humidity data from the local system, Between the master and slave data transmission RS-485 communication interface chip, can be realized in a remote control room to monitor the scene of multiple monitoring points.
Simulation of Closed-Loop Paper Tension Control System
Authors: Sun Yu Qiu , Zhao Ji Bin , Sun Jian Xin , Cai Ji Fei
Published: June 2013

Paper tension is the most important control parameter in roll material production that directly impacts the printing quality of the web offset. Based on the closed-loop paper tension control theory, by conducting a research into the simulation of paper tension control system with MATLAB/SIMULINK, presented the closed-loop control diagram about the paper tension control system. Under different control parameter, the value of the overshoot, respond speed and residual of the system varies. As a result, the quantitative research on the simulation of the system offers a valid means in improving the control accuracy.
Development of Welfare State under Automation Control
Authors: Liu Fang , Wu Qi
Published: June 2013

This article has embedded welfare triangle paradigm in empirical research by social exclusion and social policy. Starting from the situation in Sweden and Finland, it has analyzed the convergence and the differences in paradigm content. At the same time, by using the social research to quantitative analysis the data, it has drawn the economic recession and recovery. Based on the above analysis, it is necessary to build a welfare system that in line with the national condition, to select a long-term welfare system mechanism, and to constantly improve the prototype of the welfare system that has begun to take shape.
Self-Adaptive Control Synchronization Research of Double Exciting Motors
Authors: Li Xiao Hao , Huang Ying , Zhao Qun Chao
Published: June 2013

Based on the single-mass nonlinear vibration system that driven by double exciting motors, the harmonic vibration adaptive control synchronous strategy for the double exciting motors had been designed in the paper. Based on the motion feedback of the double exciting motors to adaptive modify the control parameter of the synchronization controller, make the multi-exciting motors to realize the angular speed equal and phase difference constant synchronous movement. And during the synchronous motion process, adjust the adaptive law to improve the synchronously motion stability margin. The simulation experiments had been carried out based on the simulation model that established in the paper and the experimental results showed that the harmonic vibration synchronization control strategy can achieve satisfactory control accuracy and robustness.
3D Face Modeling Adjustment Based on Kriging
Authors: He Fang Yuan
Published: June 2013

3D face modeling has been an important offset of computer graphics. It can be used in many fields. Modeling reality face of a given person is a difficult task because of the complexity of face surface. To improve the modeling results, kriging was used in 3D face modeling adjustment . The general face model is personalized using the space interpolation technology of Kriging. To improve the result of Kriging, the 3D model is smoothed by interpolating once again in a local area near every feature point, and then a better natural result is achieved. The final model is more human and natural.
Analysis and Measure of Coal and Gas Outburst Based on Matter Element Model
Authors: Li Jun Tao , Wang Shi Chao
Published: June 2013

For the problem of coal and gas outburst danger prediction, this paper combines the Extenics theory and analytic hierarchy process method to construct the matter element analysis model. It uses AHP to determine the coal and gas outburst weight coefficient of each factor, and uses the euthenics method to establish the degree of risk of coal and gas outburst prediction model. It highlights the degree of risk prediction by a mining seam of coal and gas, and obtains the degree of risk to prove the feasibility of the method.
Spatial-Temporal Association of Duration of Peak Period at Signalized Intersections
Authors: Qian Liang Hui , Zhang Hua , Chen Xiao Hong
Published: June 2013

In the case of peak spreading, the traditional static analysis on the duration of congestion using peak 15 minutes of hour has lost its meaning. To deal with congestion, we need dynamic analysis on the onset and dissipation of congestion. This paper aims to reflect the severity of congestion, even the spatial interaction of congestion, by the relative size of peak period. Two thresholds, the minimum value in the peak hour and 95 percent of peak hour volume respectively, were chosen to define the peak using archived stop-bar detector data. The thresholds and the time-granularity of the data were cross-compared to choose appropriate threshold and data time interval, and the result is 95 percent of peak hour volume under 10min interval data. Then the measures of duration of peak period, including the length of peak period, the beginning and ending time of peak period, were calculated for different signalized intersections inlet approaches. Further, the measures of peak period of different intersections in the same direction of the same radial road were presented to find out the commute traffic patterns. Lastly, the spatial-temporal association pattern of the measures of peak period of different intersections in downtown Shanghai was performed by ArcGIS.
Thermogravimetric Study of the Effect of Particle Size on the Spontaneous Combustion of Indonesian Low Rank Coal
Authors: Saleh Muksin , Nugroho Yulianto Sulistyo
Published: June 2013

Low-temperature oxidation of two Indonesian low rank coals was characterized by Thermogravimetric analysis (TGA). The effect of particle size on the spontaneous combustion of coal was examined. Coals were classified to-599+299, -299+249, -249-150, -150+76 and-76 μm size groups and through non-isothermal method scanned from 24 to 600°C at heating rate 5°C/min with air flow rate 50 mL/min. DTA thermogram shows that the transition temperatures decrease by decreasing the particle size. Furthermore, the weight loss increases by decreasing particle size. It is indicated that the propensity of coal to spontaneous combustion increase with decreasing particle size. The moisture loss activation energy and oxidation activation energy were calculated by an integral method using the Coats-Redfern formula. The results show that the propensity for spontaneous combustion of two coal samples (judged by the activation energy) increases by decreasing particle size.
Design of the Steiner Minimal Tree
Authors: Huang Zhong Yu
Published: June 2013

Steiner minimal tree is one of the most important combinatorial optimization problems, it has extensive application prospects. In this paper, we will present an algorithm for the Steiner minimal tree under the condition that the known points are less than 5 based on some elementary properties and the results on Steiner ratio. Moreover, we obtain some design figures with certain points distributed in the apexes of some equilateral triangles.
An Efficient Broadcasting TDPA Protocol for Ad Hoc Networks with Directional Antenna
Authors: He Zhao Ran , Shi Hai Bin
Published: June 2013

Directional antenna has tremendous potential in improving the network capacity and anti-jamming compared with omni-directional antenna for ad hoc networks. In this article, a novel MAC protocol called TDPA based on TDMA was presented for ad hoc networks with directional antenna. It improved the spatial reuse by adaptively selecting interference-free angle according to communicating nodes positions, and increased the network throughput and broadcasting efficiency by piggyback retransmission technique. Analysis and simulation results showed that it can significantly improve network performance.
The Tectonic and Uplift History of the Kuruketage Area in the North-East Edge of the Tarim Basin, China: Constraints from Detrital Zircon and Apatite Fission Track Data
Authors: Xiao Hui , Han Wei , Guo Feng
Published: June 2013

This study uses the application of zircon fission track (ZFT) and apatite fission track (AFT) thermochronometry technique to investigate the tectonic and uplift history of the Kuruketage area, north-east edge of the Tarim Basin. Based on measured ZFT, AFT and equivalent vitrinite reflectance measurements of samples in sedimentary rocks in Kuruketage area, the temperature time evolution history from early Paleozoic strata was modeled. The results show that the youngest peaks of ZFT at 371-392Ma and 328 - 305.7Ma record Hercynian tectonic and uplift event; the AFT peaks at 134.5 - 164Ma, 73 - 100Ma and 35.4Ma mainly represent the Late-Cretaceous tectonic and uplift event in Kuruketage area. The AFT thermal modeling results from the early Paleozoic strata indicate that the maximum paleo-temperature (at 140 215°C) experienced in late Silurian to early Devonian, and the strata temperature decreased to about 120°C before the Late-Cretaceous.
Model Test on Disruptive Mode of Sandy Soil
Authors: He Ting Yin , Yan Fu Rong , Li Qing Bo
Published: June 2013

Based on similarity theory, the paper has studied the strip foundation the disruptive mode and the load bearing mechanism. One model test has been designed to simulate the sandy soil foundation entire process begin to deform until to destruct. The diversity place earth pressure and the distribution rule have been analyzed, and shear belt formation and the developing process has been observed. The results show that the model test could reflect the ground deformation to destruction entire process, the subsidence distortion characteristic, the foundation stress distribution, the destruction shape and mechanism, which will be an effective way in studying the foundation disruptive mode and the load bearing mechanism.
Effect of Surface Play on the Quality of the Hole when Drilling Multi-Directional CFRP Composites
Authors: Eneyew Eshetu D. , Ramulu M.
Published: June 2013

The effect of surface ply on the quality of the hole produced when drilling multi-directional carbon fiber reinforced plastic (CFRP) composite laminates was investigated. A series of drilling experiments are performed using a carbide drill tool on two multi-directional CFRP composite laminates. The two composite laminates have similar stacking sequence except the surface plies, namely woven fabric and fiberglass scrim. The thrust force and torque was collected during the drilling process. The quality of the drilled hole was examined through surface roughness measurement, fiber pull out, and delamination. Thrust force was found to be higher for the composite laminate with woven fabric surface plies. The exit delamination factor measured from the holes with woven fabric surface plies found to be lower than the holes with fiberglass scrim surface plies.
Stress Analysis of Photo-Elastic Orthotropic Composite Material and Measurement Fringe Value of Shear Material
Authors: Jiang Yun , Zhang Hua Dong , Hu De Ben , Fan Xiao Chun
Published: June 2013

Based on the analysis characteristics of orthotropic composite material under antisymmetric force, a new measurement method is established which can independently measure the fringe value of optical shear orthotropic material by pure-shear experiment. Two orthotropic photo-elastic composite material beams with rectangular cross-section which fiber orientation is 0 °, 90 ° respectively are loaded anti-symmetric force, so that the anti-symmetric section is in a pure shear stress state. The fringe value of orthotropic photo-elastic shear composite material is measured . The results agree with three stripe specimens tensile experiment.
Gold Recovery from WEEE by Chlorine System
Authors: Assadian Mahtab , Idris Mohd Hasbullah , Shahri Seyed Morteza Ghaffari , Gholampour Babak
Published: June 2013

This work compared the effect of nitric acid and chloride acid systems on dissolving precious metals of Electrical and Electronic Equipments (EEE). As a result of the revolution of informatics technology, the production of EEE is rapidly increasing in the world. Due to economic growth, technological innovation and market expansion of EEE there is a significant increase in waste of EEEs (WEEE) that presents a new environmental challenge.The results show that the best recovery of gold can be obtained via aqua regia (3HCl=HNO3), with concentration of 1/10 gr/L. The reaction temperature has little effect on the extent of extraction.
Research on Ultra-High Performance Concrete with Rice Husk Ash
Authors: Tian Er  Bu , Zhuang Yi Zhou , Wang Feng Chao
Published: June 2013

Tests were carried out on the properties of Ultra-High Performance Concrete (UHPC) by partially or completely replacing Silica Fume (SF) by Low-temperature Rice Husk Ash (L-RHA) .The results show that the activity and adsorptive capacity of L-RHA is greater than SF; The compressive strength of UHPC is increased by both the filling effect and the secondary hydration effect for L-RHA, but only by the filling effect for SF. However, more than 10% dosage of L-RHA or SF reduces the early compressive strength of UHPC. The compressive strength of UHPC with two blends of L-RHA and SF with less than 10% dosage of each ingredient is higher than the one with only a blend of ingredient, L-RHA or SF.
The Comparative Study on Influence on the Northeast China UHV Planning Power Grid Induced by Different Kind Geomagnetic Storms
Authors: Cheng Yan , Wang Kai Rang , Sun Shu Min , Ge Hai Yang , Li Guang Lei
Published: June 2013

Along with the UHV construction scheme, China will form a large number of transmission lines which have the characteristics of the ultra-high voltage, large-capacity, long-distance. Because the UHV power grid transmission line parameters and the structure of the grid and the transformer are different from the other power net, Geomagnetic storms will affect the UHV power grid more, the work have important significance to the assessment of the ultra-high voltage power grid level and influence. The impact of different storms on the grid are also different .Based on the power flow mechanism of the GIC, different data and network parameters of geomagnetic storms, the evaluation model of the GIC is established ,we assess the result of the GIC induced by the geomagnetic storms happened on November 2004 and December 2006 in the 2020 planning ultra-high voltage power grid, find out the greatest impact transformer substation and the timing analysis results of the grid compare the different impact of different storm.. The comparison of the analysis results is helpful for understanding the different kind geomagnetic storms and the regional features of GIC.
Innovative Method to Achieve Product Quality Convergence and Optimal Electrical Energy Consumption by Changing Motor Frequency in Batch Annealing
Authors: Mollagoli Hamidreza , Heydarian Meysam
Published: June 2013

The batch annealing process is used for heat treatment of coils output of the cold rolled process. In this process, high speed fan motors are used to generate strong convection currents and thermal heat convergence in all coil layers. Several factors could affect product quality grade. In this work by changing the motor speed, optimal frequency is reported to have the highest quality convergence and lowest energy consumption. For testing, frequencies of 45, 55, 65 and 75 Hz were tested. The results showed that there is highest quality convergence and lowest electrical energy consumption in frequency of 55 Hz. The practical solution represented in this work can be used to achieve optimal frequency for each condition.
The Construction and Development of Comprehensive Test Centre Based on Real Transmission Line
Authors: Yang Xiao Hui , Yan Dong , Zheng Yu Sheng , Kou Xiao Kuo
Published: June 2013

Galloping of overhead transmission line is a low-frequency, large amplitude, wind-induced vibrations of both single and bundle of overhead transmission lines, which have been one of the largest threaten for the security and stability of power grid operation. On account of the uncertainty and probability of galloping events happening, most of the study on transmission line galloping had still stayed on simulation or model test, only less of the study were in accordance with the accident records on-site. Several ten years study on conductor galloping had been proved that the laboratory built on real transmission line was the essential foundation and the effective condition for the systemic study on galloping. Comprehensive Test Centre based on Real Transmission Line (CTC for short) is the first laboratory focus on the study of conductor galloping and ice-accretion. whose content of tower type,conductor arrangement and transmission line length, currently have been the most abundant in worldwide. The establishment of the Comprehensive test centre have been very important on promoting the fundamental and systemic study in the relative field. Since the frequent conductor galloping under the condition of natural climate achieved successfully, CTC have developed several essential and valuable scientific projects. In this paper, CTC would be introduced from the aspects of basic facilities configuration, mainly function design and implementation, focal capabilities and some study outcomes at moment.
Increasing Efficiency of Overshot Waterwheel with Overflow Keeper Double Nozzle (OKDN) by Using Hydraulic Ram System
Authors: Wahyudi Bagus , Faizin Akhmad , Soeparman Sudjito
Published: June 2013

Waterwheel has been developed over two millennia to be efficient hydraulic machine but have weaknesses due to his inability to increase the torque although the flow of water has been increased - because the efficiency of this water wheel is only dependent on the volume of buckets and gravitational those are always constant. In this study demonstrated a new method to improve the torque of overshot waterwheel (OWW) by recapturing overflow of water from the buckets and the excess flow from the channel to be converted into kinetic energy through the nozzle and then squirt against to the curve vane in the buckets by using hydraulic ram pump system. The result of performance test proved that OKDN using hydraulics ram able to improve their efficiency more than conventional overshot wheel.
Study on Inverter Based Regenerative Braking Energy Feedback and Utilization Scheme in Urban Rail Transit
Authors: Tang Ping , Wang Cun Ping , Yin Xiang Gen
Published: June 2013

In order to restrict the boosting of the voltage of the DC bus in the urban rail transit during the regenerative braking and enhance the utilization rate of the regenerative braking energy, two kinds of inverter based regenerative braking energy feedback schemes are studied, the features and application occasions of which are analyzed in detail. The simulation results verify that this method could effectively restrain the boosting of the DC bus and achieves the goals of energy conservation and reactive compensation.
Radionuclide of Process of Carbon Decomposition and Anneal of Liquor after Desilication from Nepheline
Authors: LI Yong Jia , Lei Ting , Yang Da Jin
Published: June 2013

Carbon decomposition of liquor afger desilication from nephine was investigated, aluminium oxide was prepard by anneal of Al (OH)3 separated out from carbon decompositon, and analysis of radionuclide of both above process was performed. The results show decomposition rate of sodium aluminate can be obtained when experiments of carbon decomposition of liquor after desilication using CO2 of hight concentration, and it is beneifit for the crystal growth of Al (OH)3, filtration and separation. Great mass of nuclide exists in the mother solution of carbon decomposition, and few into Al (OH)3, which could be regarded as wiout radioactive contamination.
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A Simple Double-Star Positioning System Positioning Algorithm
Authors: Li Yi De , Lin Xue Yuan , Guo Li Long
Published: June 2013

Double-star navigation and positioning system use Double-star positioning system which basic principles are the intersection of three balls. Two measurements relate to the distance of the two satellites and the user, and the third measurements which relate to the user elevation are the critical factor to determine the positioning precision. For this reason, based on the Earth ellipsoid geometry and geodetic latitude knowledge, this paper derives the accurate model of the third measurement, and establishes a user location algorithm. The algorithm is simple and easy to understand, and simulation tests show that the algorithm has fast convergence and accurate positioning.
Damage Identification Research for Steel Plate Based on Lamb Wave
Authors: Li Xin Gang , Chen Qiang , Chen Shu Hua , Wang Yue Min , Song Guo Zhi
Published: June 2013

According to the characteristics of wave propagation in steel plate, choosing the suitable excite mode and frequency. Based on the wave structure of A0S0, obtaining its displacement discipline, then arriving at the sensitivity effect for different depth of defect in different frequency. Making different depth circular damage in the steel plate, calculating the law of lamb wave in different damage by using continuous wavelet transform.
Research on Reliability of Equipments Based on Interval Prediction Method
Authors: Liu Jian Fang , Yang Jian Hua
Published: June 2013

While reliability is an important aspect of equipment quality, it has a remarkable effect on the usability of equipments. Reliability can reflect equipments' ability of keeping performance. As a method of design, reliability prediction is the fundamental of design decisions. In this paper, the grey system theory is used to deal with the data of reliability, and the method of interval prediction to predicate the reliability of equipments and analyze how to improve its reliability.
The Effect of Welding Angle for Acoustic Emission Propagation in Offshore Jacket Platform
Authors: Wang Long , Yang Guoan , Jia Le Le , Jia Guang
Published: June 2013

Considering the requirement of NDT for offshore jacket platform, the effection of welding angle to the propagation characteristic of acoustic emission (AE) is studied. Amplitude and energy are the main analysis parameters for the experiment. As used wildly in jacket structure, the 90 and 45 degrees welding angle are discussed. The research result can provide references for engineering application of AE technique to locate the damage source and analyse the failure feature.
The Choice and Application of Binder in New Energetic Matierals
Authors: Wang Hong Jie
Published: June 2013

This paper via choosing and testing the binder used in PBX explosive with basic of LLM-105. Then the experiment comes out a feasible choice using EPDM as binder to pack LLM-105 simple substance.
Creep Life Prediction of T91/12Cr1MoV Dissimilar Welded Joint
Authors: Chen Hu , Zhu Jin Dan
Published: June 2013

Based on the creep test results of T91/12Cr1MoV dissimilar welded joint at different conditions, the creep curves of this dissimilar welded joint were established by modified θ projection concept. Low stress creep life was predicted by this curve and the established creep curve shows a good agreement with the experimental data. For computation, Larson-Miller parameters method was also used in creep life forecasting of T91/12Cr1MoV dissimilar welded joint. The resu lt showed that the modified θ projection concept was more accurately in predicting the creep life than Larson-Miller parameters method in allusion to T91/12Cr1MoV dissimilar welded joint.
Experimental Study on the Effect of Adding Carbon Black Powder on Tensile Strength of LDPE Films under Artificial Weathering Condition
Authors: Rezavand S.A.M. , Falah Kordi S. , Azdast Taher
Published: June 2013

The properties of plastic parts that used for outdoor applications are changed under weathering conditions. Weathering involves considering the effects of solar radiation, temperature, humidity, pollutants. By adding some additives such as carbon black, TiO2, Hals and Tinuvin, the weathering effect could be decreased. In this study, LDPE films by adding different percentages (0.1, 0.5 and 1%) of carbon black (C.B.) with 0.2 mm thickness were produced by extrusion process. Samples were cut according to ASTM D882 and to accelerate the tests, samples located in accelerated artificial weathering device up to 1400 hour. The device was set at 40°C and humidity of 50%. Required samples for tensile strength test bring out of device at selected period and tensile strength was done by 350 mm/min strain rate. The results show that samples containing carbon black have tensile stress and elongationmore than the clear films. Carbon black absorbs UV light and heat that causing to delay in broken links and destroying the molecular. The optimum percent for tensile stress was 0.5 and for elongation was 1% C.B.
Study on Irrigation Model Based on Plant Ultrasonic Acoustic Emissions
Authors: Wang Jian Xin , Gao Xian Wei , Sui Mei Li , Li Xiu Ying
Published: June 2013

Produced by cohesion between water molecules or adhesion to the conduit wall, the plant cavitation is accompanied by the vessel walls vibration which is the indicator of the water stress. The ultrasonic acoustic emissions (UAEs) are used to detect the plant cavitation events which are the transmission of vibration. The UAEs could be detected in ultrasonic frequencies between 100K Hz and 1 MHz. The PCI-2 data acquisition (DAQ) equipment and R15 sensors are used to improve the precision of cavitation detection. When the water stress and dehydration gets heavier, the UAEs rate gets higher. Use the tomato practice data with the empirical deduction under the modern greenhouse conditions, the UAEs and Transpiration Index (UAETI) and the UAEs Irrigation Index (UAEII) irrigation model are draw from the relationship between transpiration and UAEs. UAETI can be used to analysis the transpiration, and UAEII can be used to analysis the irrigation time. It is better to use UAEs technique to carry out automatic and precise irrigation for the plant and to improve the effect of Water-saving irrigation.
Truss Structure Health Monitoring Based on Electromechanical Impedance Method
Authors: He Cun Fu , Cai Xiao Ming , Yang Shen , Liu Zeng Hua , Wu Bin
Published: June 2013

Truss structure is widely used in civil engineering applications for its advantages of easy transportation, convenient assembly and uniform loading. However, it is difficult to achieve real-time health monitoring because of connection diversity and complexity of truss structures. As a novel structural health monitoring technique, electro-mechanical impedance method could monitor the health state of one structure by measuring the spectra of impedance or admittance of the piezoelectric elements, which are bonded on the surface of this structure. This approach has the advantages of nonparametric model analysis, easy sensor installation and high local sensitivity, especially in sensitive frequency range. The damage information, which is tested and recorded by using electromechanical impedance method, could convert into intuitive results through neural network because of its good ability for nonlinear mapping. In this paper, a three-layer assembly truss structure was chosen as experimental object, piezoelectric elements were bonded on structure joints to measure structural impedance spectra, the change of these structural impedance spectra was tested and recorded under high frequency excitations when different truss bars were loosed, and then, one back-propagation (BP) neural network was built and trained by this damage information, which were treated as input samples. These results show that the sensitivity of impedance method is not the same to different frequency range and trained neural network could quickly identify loosen truss bars.
An Investigation for Surface Integrity of Al2O3/A356 Composites Using Roller Burnishing Process on a Milling Machine
Authors: Ibrahim A.A.
Published: June 2013

Roller burnishing process was applied to Al2O3/A356 composite specimens. The process was carried out on vertical milling machine. Effects of the burnishing process with varying process parameters on the characteristics of the machined surface and sub-surfaces were investigated. Residual stress distribution at different depths beneath the burnished surfaces, microhardness distribution, surface roughness were used as criteria to obtain the optimum burnishing conditions that give burnished surfaces with high integrity for the Al2O3/A356 composite. Results showed an improvement in surface characteristics of Al2O3/A356 composites using burnishing process. The better surface roughness was obtained with double passes burnishing, depth of penetration of 0.12 mm, and burnishing speed of 72 mm/min. Increase of number of burnishing passes increases the value of residual compressive stress and the microhardness at the burnished surface and subsurface. The microhardness slightly decreased with the increase of burnishing speed.
The Development of Rock Failure Electromagnetic Emission Monitoring System
Authors: Huang Song Ling , Zhu Fu Rong , Zhu Hong Xiu , Wei Zheng , Wang Shen
Published: June 2013

The research about electromagnetic emission (EME) during rock failure is very important to earthquake prediction and mine safety. A corresponding monitoring system has been developed according to the characteristics of EME signals during rock fracture, which include a wide frequency band and small amplitude of the inductive signals. The system is constituted by electromagnetic induction probe, signal-conditioning circuit and a computer for data acquisition. Among them, the electromagnetic induction probe can detect spatial magnetic field changes in a certain direction and convert it into electrical signals, the signal-conditioning circuit can magnify, filter and isolate signals acquired by the probe, and the computer for data acquisition is used for recording and displaying the detected signals. Several testing results have been achieved in rock failure experiments on marble that are carried out both by mechanical loading and expansion caused by chemical agents.
Computer Simulation of Lower Extremities Movement during Stair Climbing
Authors: Raspudić Vesna
Published: June 2013

Tracking of human body motion is applied in many fields, such as virtual reality, clinical biomechanics, the study of man-machine-environment relationship, the analysis of sports movements, etc. Nowadays, the preferred approach to tracking human body motion is based on the use of appropriate optical or magnetic markers, which are placed on specific landmark points, and real-time estimating of their spatial coordinates. With the improvements introduced in computerized monitoring of human motion kinematics, it is important to emphasize the significance of combining motion capture data with commercial CAD packages.
The aim of this research was to develop new interactive methods in creating virtual models within the highly sophisticated CAD computer technologies, as well as computer simulations for analyzing the various forms of human locomotion. Within this research, special attention is focused on the study of locomotion when climbing stairs, as an activity that requires large amount of metabolic energy, and thus represents great difficulty in performing daily activities for people with disorders of the musculoskeletal system, and particularly for people with lower limb amputation.
Distributed Feedback Fiber Laser Rosette for Acoustic Emission Detection
Authors: Huang Wen Zhu , Zhang Wen Tao , Ma Huai Xiang , Li Fang , Du Yan Liang
Published: June 2013

This study aims at providing a practical method in large structure health monitoring. A novel fiber optic rosette based on distributed feedback (DFB) fiber laser for acoustic emission (AE) detection and location is presented. The ultra-narrow line width of the DFB fiber laser will result in high resolution in AE wave detection using a fiber optic interferometric demodulation method. The directivity of the fiber optic rosette is investigated. A rosette with three DFB fiber lasers is tested in the experiment to determine the direction of propagation of AE waves.
Experimentation of Detecting the Talc-Containing Wheat Flour in Solution by Near Infrared Spectroscopy
Authors: Liu Cui Ling , Dong Xiu Li , Sun Xiao Rong , Wu Jing Zhu , Wu Sheng Nan
Published: June 2013

Do quantitative detection of talc-containing wheat flour using near infrared spectroscopy combined with BP neural network.Confect 50samples by adulterating talc to wheat flour,randomly selected nine samples as the prediction samples, formulated10 talc-free flour samples for qualitative analysis.The results show that:BP neural network combined with NIR for the determination of talc-containing flour is ideal, can be used for talc-containing flour; the result of cluster analysis should that it need to seek better methods for talc-containing wheat flour.
Rosette Eddy Current Sensor for Structural Health Monitoring
Authors: Ding Hua , He Yu Ting , Jiao Shen Bo
Published: June 2013

To monitoring of the crack damage located at the bolt hole of metallic bolted-joint structure in real-time, a fatigue crack monitoring scheme based on rosette eddy current sensor is put forward. The characteristics of sensor are analyzed via semi-analytic model, and feasibility of proposed scheme is verified through monitoring experiment using constructed fatigue crack monitoring system. The result of semi-analytic model shows that the magnitude of transimpedance is more sensitive to changing of conductivity and liftoff than phase of transimpedance, and the sensitivity of magnitude increases with the frequency. The result of fatigue crack monitoring experiment of 2A12-T4 aluminum alloy under constant load indicates that viewing the break point as indication of crack position, the rosette eddy current sensor achieves quantitative-monitoring capability of fatigue crack with precision of 1mm and the sensing-channels near fatigue source are capable of qualitative-monitoring of accumulated fatigue damage.
Research of Structural Health Monitoring System for the Crane Based on Wireless Strain Sensors
Authors: Li Na , Wang Zhi Jie , Ding Ke Qin
Published: June 2013

Research on the field of crane health monitoring has been conducted for the strain monitoring demand on the using of key components of crane and major safety monitoring requirements of crane in China. Strain monitoring nodes based on wireless transmission network have been designed, and crane structure health monitoring system has also been developed on the basis of this technology. The system has been taken contrast experiments with strain gauge acquisition equipment on-site, and the results of experiments show that this system could not only measure accurate strain, but also realize the real-time monitoring and reflect the stress state of crane on operation in time.