bluuebunny/crossref_metadata_2025 huggingface dataset:
Fault Diagnosis of Cascaded Converter Based on Wavelet Packet RBF Neural Network
Authors: Wang Xin , Xu Juan , Zhang Guo Dong , Qi Rui Min
Published: March 2013

To study the power component open circuit faults diagnosis method of the cascaded converter. Aiming at the insufficiency of the BP learning algorithm in the machinery fault diagnosis, such as the low learning convergence speed, the easily appearing local minimum, the instability learning performance caused by the initial value, to proposed a new method applied to the cascaded converter based on radial basis function (RBF) neural network. Experiments show that the method based on wavelet packet analysis and RBF neural network has better learning and fault identification capability, and it can meet the online real-time fault diagnosis of the cascaded converter.
The Research and Development of Water Jet Technology
Authors: Luo Shu De , Xu Yu Jiao
Published: March 2013

As a new manufacturing technology, a brief history of the development of the water jet technology is investigated. Several represenntive emerged jet technologies such as cavitating water jet technology, pulsed jet technology, abrasive jet technology and pure water jet technology, accompany with their characteristics are intoduced respectively. The applications of water jet technology in variety fields such as traditional cutting, medical science, and mining and so on are described. With the rapid development in recent years, this kind of technology is playing an increasing important role in national economy.
Part Roundness Errors Evaluation Based on Modified Simplex Method
Authors: Huang Xiang , Li Lin Shu
Published: March 2013

On the basis of establishing programming model of geometric error’s minimum regional evaluation, this paper applies modified simplex method to optimization evaluation of axial parts’ roundness measurement in order to improve the accuracy and speed of roundness error evaluation. The result shows that roundness error evaluation based on modified simplex method is of the following advantages such as high evaluation accuracy, fast calculation speed and good repeatability and so on. Practical examples prove that this method is of universality and practicality.
Study on the Composition and Control of Robot Structure
Authors: Feng Bo
Published: March 2013

Robot is a typical representative of high-tech research results. In a robot, the wisdom of human is applied throughout its whole structure, and also task commands are executed through an intelligent control system. Human society is always progressive and innovative. It is believed that great breakthroughs will be made to the future robots in structural combination, automatic control, working performance and so on. China is still a country in the developing stage, and therefore the research and manufacturing activities of robot products will be increasingly more. It is necessary for the research and development of robots at any period to give priority to "functional standards". On this basis, a study is made in this paper.
IoT-Based 4PL: Prospects and Business Models
Authors: Yang He , Zuo Yan Hong , Li Yan Ru
Published: March 2013

The purpose of this article is to find out the future business models and business model innovation methods of Internet of Things (IoT) industry. Through the analysis of IoT-based logistics information system features, it is clear that IoT-based supply chain integration must be dominated by fourth party logistics (4PL) providers rather than telecoms and technical manufacturers. Two implementation models of IoT-based 4PL are viable. Under the function of more rational policies, many enterprises including logistics providers, logistics management consultants and IT companies would be IoT-based 4PL enterprises, and enhance the logistics management of all society.
Design and Implementation of Remote Monitoring System for Drinking Water Quality in Country
Authors: Huang Ding Jin , An Tao , Chen Wei
Published: March 2013

In order to monitor the quality of drinking water in country, the system at fist acquires the data of monitoring parameters by the intelligent embedded terminal, later sends data to the monitoring center by GPRS wireless technology, at last the center implements the functions of the data analysis and control decision. The system had been used in the pipe modification project of rural drinking water in series towns in Wusu City of Xinjiang Province. So far the system had operated well and reliably, and undertaken the automatic, remote and informationized management of the whole process of drinking water supplying.
Design of Collecting and Processing System of GPS Information Based on ARM and Linux
Authors: En De , Wei Huang He , Wei Na Na , Shi Xiao Long , Zhou Chang Sheng
Published: March 2013

GPS information collecting and processing is an important part of the navigation and positioning system. Through the establishment of cross-compiler environment, using the ARM processor S3C2440A and Linux operating systems as the hardware and software platform and the GS87 is used as GPS receiver module, the NMEA-0183 communications protocol and serial asynchronous communication between the ARM platform and GS87 module are analyzed. Through the serial port programming, GPS information collecting and processing system is realized. By querying the GPRMC statement and the corresponding conversion, the useful information is separated. The final practice has proved that the system data is of high precision, real-time property and good practical value.
A Study of the Linear Quadratic Type’s Optimal Control over the Micro-Vibration of Coupled-Pendulums with the External Force
Authors: Shan Chang Ji , Luo Jun , Li Lin , Xu Nan , Shan Yu Qiong
Published: March 2013

This paper is aimed to reach such a conclusion that the result gained from the analysis of the micro-vibration of coupled-pendulums made by optimal control theory is as consistent and effective as with that from other approaches, by the virtue of writing out the Lagrange equation of the micro-vibration of coupled-pendulums with the external force and analyzing the system by using control theories.
Hybrid Electric Vehicle Energy Management and Control Based on Battery Energy Balance
Authors: Yan Bin , Hu Yan Qing , Yan Ting , Ma Pei Pei , Yang Lin
Published: March 2013

Hybrid electric vehicle has better power and economy than conventional vehicle attributed to power efficiency range is optimized by battery energy. So making battery energy balance not only can ensure hybrid power system operate normally, but also is the key role in meeting vehicle drivability and improving fuel economy effectively. This paper analyze of the regenerating and using of battery energy. Real-time control and global optimization is used to adjust energy management strategy, the adaptive control strategy also introduced to making energy power balance on the basis of maximum fuel economy in the driving cycle.
New Compound Method for Target Recognition and Tracking
Authors: Sun Kang
Published: March 2013

In this paper, we propose compound target detection and tracking method that combines Bayesian local features classification and global template tracking. During target initialization phase, we convert local features recognition problem into Semi-Naive Bayesian classification theory to avoid computing and matching complex high-dimension descriptor. During tracking, detector hands over tracking task to the template tracker, which imposes temporal continuity constraints across on-line frames in order to increase the robustness and efficiency of the results. In typical application scenarios, once the tracker loses target, it requires the detector for reinitialization. Experiment results confirm the efficiency of our approach at last.
Assessment of the Three-Dimensional Surface Roughness Parameters
Authors: Liu Bo , Yu Hai Yin , Ye Fan , Guo Jian Ying
Published: March 2013

With the improvement of mechanical processing automatic level, the measurement of the surface roughness requires the ever-increasing demands, including the improvement of measurement methods, improve measurement accuracy and roughness parameters assessed. Around these requirements, this paper is the research to 3D surface roughness parameters, gives the method to determine the datum and 3D roughness assessment parameters.
Effect of Large Cross-Section Oxygen-Propane Flame Cutting on Microstructure in Heat-Affected Zone
Authors: Wang Zhi Xin , Han Yong Kui , Chen Yong Qiu
Published: March 2013

Many metal-manufacturing industries include oxyfuel gas cutting among their manufacturing processes because cutting was often used in metal-cutting processes, specifically in the large castings and forgings and the fabrication of pressure vessels. The oxyfuel gas cutting process uses controlled chemical reactions to remove preheated metal by rapid oxidation in a stream of pure oxygen. Previous research has demonstrated microstructure in heat-affected zone varied depending on the gas used for the combustion as well as the cutting speed (Vc) used during the process. In this research, 34CrNiMo6 steel of 900 mm in thickness and 45 carbon steel of 450 mm in thickness were cut using an oxygen-propane flame cutting process. Then, macroscopic morphology and microstructure test were done to analyze the influence of the thickness of cutting cross-section. The results showed, in general, the width of heat-affected zone increased with the thickness of cutting cross-section. Also, it was demonstrated that heat-affected zone in the bottom and top section was wider than others.
Study on Risk Assessment of Amusement Ride
Authors: Xiao Yuan , Ye Jian Ping , Chen Ruo Meng , Qian Jian Jun
Published: March 2013

The probability of hazard of amusement rides is divided into 5 categories according to characteristics, and the degree of risk hazard is divided into 5 categories. The risk matrix of amusement ride was created according to risk matrix model. The risk categories were created according to the values of matrix elements. The risk knowledge table was created according to all links of life of amusement ride.
The Constant Current Charging Analysis Super Capacitor
Authors: Zhang De Di
Published: March 2013

Super capacitor charging voltage changes linearly: the initial stage of charge, the super capacitor voltage rises quickly, the middle of change is relatively flat, after the rise again accelerated phase voltage fluctuations in charge of the initial and end of charge; charge currentthe larger the full charge time is short, to verify the characteristics of high current fast charge of the super capacitor.
A Study on Semi-Physical Simulation for Marine Gas Turbine Generator Set Based on Hardware Agent
Authors: Wang Zhi Tao , Li Tie Lei , Li Shu Ying , Ying Yu Long , Huang Xiao Xia
Published: March 2013

The simulation research on gas turbine generator set has the important practical significance for its main development direction in marine power plant. The research object is semi-physical simulation for marine gas turbine generator set. This paper presents a new type of semi-physical simulation scheme based on “hardware agent” through reviewing the existing the structure characteristics and deficiency of semi-physical simulation system of gas turbine device. The theoretical basis and operation control strategy and framework of the new project were discussed. The experiments on sudden load-up and load rejection were made based on new type of semi-physical simulation system for marine gas turbine set and had a good test effect.
Optimized Fuzzy Logic Control Strategy for Parallel Hybrid Electric Vehicle Based on Genetic Algorithm
Authors: Zhou Mei Lan , Lu Deng Ke , Li Wei Min , Xu Hui Feng
Published: March 2013

For PHEV energy management, in this paper the author proposed an EMS is that based on the optimization of fuzzy logic control strategy. Because the membership functions of FLC and fuzzy rule base were obtained by the experience of experts or by designers through the experiment analysis, they could not make the FLC get the optimization results. Therefore, the author used genetic algorithm to optimize the membership functions of the FLC to further improve the vehicle performance. Finally, simulated and analyzed by using the electric vehicle software ADVISOR, the results indicated that the proposed strategy could easily control the engine and motor, ensured the balance between battery charge and discharge and as compared with electric assist control strategy, fuel consumption and exhaust emissions have also been reduced to less than 43.84%.
Researching in Shallow Parsing Based on Function Invariance of Maximum Likelihood Estimation
Authors: Zhang Shuang , Zhang Shi Xiong
Published: March 2013

Abstract. Shallow parsing is a new strategy of language processing in the domain of natural language processing recently years. It is not focus on the obtaining of the full parsing tree but requiring of the recognition of some simple composition of some structure. It separated parsing into two subtasks: one is the recognition and analysis of chunks the other is the analysis of relationships among chunks. In this essay, some applied technology of shallow parsing is introduced and a new method of it is experimented.
Study on Corrosion Resistance of 00Cr13Ni7Co5Mo4W Maraging Stainless Steel in Seawater
Authors: Jiang Yue , Ai Ying Ying , Wang Qi Ting
Published: March 2013

The seawater corrosion resistance performances of 00Cr13Ni7Co5Mo4W maraging stainless steel were contrastively investigated by using electrochemical measurements and chemical immersion tests. The results show that breakdown potential of specimen in aging-state is reduced due to R phase precipices during aging. The difference between breakdown potential and protection potential of maraging stainless steel is little, and the restorability of the passive film is strong with small-scale shallow pits. After solution treated at 1100°C for 1h followed by aged 490°C for 8h,the breakdown potential and the annual corrosion rate of 00Cr13Ni7Co5Mo4W maraging stainless steel were 230 mV and 1.5091µm/a , respectively, showing a good resistance to seawater corrosion.
Simulation on Cutting Temperature during Milling Aluminum Alloy 7075- T7451
Authors: Ge Jiang Hua , Yang Guang Qi , Wang Ya Ping , Zheng Jun Qiang , Wang He Long
Published: March 2013

Based on the finite element analysis software AdvantEdge, a simulation model for the milling process of aluminum alloy 7075-T7451was established to research the cutting temperature. This simulation model predicts the temperature distribution of work-piece and cutting tool, and the temperature variation trend along with the milling speed and rotational speed. The simulation results provide valuable references for researching on machining mechanism.
Experimental Study on Axial Compression Performance of High-Strength Aluminum-Alloy Columns with H-Section
Authors: Fan Feng , Wang Yu Jin , Lin Li , Qian Hong Liang
Published: March 2013

This paper presents an experimental investigation of aluminum alloy H-type sections subjected to axial compression between two pinned ends. The specimens were fabricated using 6082-T6 heat-treated aluminum alloy. 26 material tensile tests were performed then a test program included 12 column tests which were separated into 6 test series of different geometry and ranged from 990 to 1840 mm in length in order to obtain a column curve. All the observed failure modes for the column tests were overall buckling and the axial capacities were obtained.
An ALB Model of Eco-Industrial Parks
Authors: Liu Fang Liang , Yu Xiu Juan
Published: March 2013

The design and management of Eco-Industrial Park (EIP) should be conducted based on quantitative analysis. In this paper, A model for EIP decision is developed. Industry ecological chain is introduced into the model, so that the decision in the course of EIP design and management can be formulated as an assembly line balance (ALB) model. It is easy to use, modify, reuse the model, and can be used as the optimization models in EIP decision-making or choosing members. A case study of a prototype EIP in Harbin City in China is illustrated. Two scenarios are studied. The ALB model is solved by LINGO software.
The Length Optimization of Non-Stayed Cable Segment to Low-Pylon Cable-Stayed Bridge
Authors: Bi Hong Tao , Wu Liang
Published: March 2013

In this paper, combined with the background engineering, according to the cable-stayed bridge's design theory, through the adjustment of cable force to change the structure's internal force by using the big general finite element method software which is named Midas/Civil, and then analyzed the related parameters affecting to structural internal force and distortion, which obtained the reasonable length of non-stayed cable segment to this kind of bridge.
A Research on Analytical Life Prediction Model of Gas Well Pipe in CO2 Corrosion
Authors: Wu Rui , Chen Pei Fu , Zhao Xin Tong
Published: March 2013

The analytical life prediction model of natural gas well pipe in CO2 corrosion is established based on the research of CO2 corrosion. The residual life of the pipe, which will provide foundation for pipe examining and replacing decision can be calculated by the model. The research is valuable in terms of theory and practice.
Papermaking Waste Water Resource Recovery - A New Approach of Preparation of Coal Water Slurry
Authors: Zhao Zhong Xia , Lv Wei , Li Rui Yang , Wang Xin Hai , Zhang De Li
Published: March 2013

Papermaking waste liquid instead of water to prepare coal water slurry, which aim is turning waste into treasure. Not only can the waste fundamentally eliminate environment pollution, but also saving a lot of water resources. Because the waste contains large amounts of sodium, which is one of the main reasons of heating surface slagging of boiler. So it is necessary to improve and increase the soot blowing device of heating surface of boiler.
Optimization for Matching Absorption of Infrared Radiation Heating in whole Wavelength Region
Authors: Liu Xing Jia
Published: March 2013

Based on the analysis of the absorption spectrum of dried object and the radiation spectrum of heater, the concept of Matching Absorption Degree in Whole Wavelength Region (MADWWR) and its design optimization method are put forward. The corresponding mathematical model is established. Taking soft-base coat drying for example, design optimization of MADWWR is carried out in different temperatures. The optimal values of MADWWR and surface temperature of heater are obtained. The effectiveness of the results is verified by the engineering example. The calculation method and the corresponding calculation program of optimal matching degree are universal, which can provide useful guidelines for the energy-saving design of infrared heating and drying.
A Signal Conditioning Preposing Circuit for Portable Wheel Load Measure Plate
Authors: Zhao Xin Tong , Lu Xiao Dong , Lu Wen Sheng , Jin Cheng Jun , Zhang Xi Jun , Zhang Guo Dong
Published: March 2013

Portable wheel loads measure plate is force sensor based on strain measure and it can bear multidimensional force simultaneously. It is able to recognize radial wheel load through decoupling. Signal conditioning of the sensor will affect the measure accuracy. There are many strain-gauges in the plate. So the signal of measure plate will include CM noise, thermal noise and high shift. The signal conditioning aimed at these disadvantages should be high gain, high accuracy, low noise, low shift, high CMRR. Multisim is adopted to analyze the signal conditioning including strain measure amplifying circuit, instrumentation amplifier AD620, operational amplifier OP07. It is turned out to be low linear distortion and is able to satisfy practical application through the experiment.
Nonlinear Dynamic Analysis Model for RC Shear Wall
Authors: Zhang Pin Le
Published: March 2013

Shear wall systems are the most commonly used lateral-load resisting systems in high-rise buildings. The building of nonlinear dynamic analysis model is the basis for calculating earthquake response. The work further investigates several nonlinear dynamic analysis models at home and abroad for RC shear wall. Classified and brief comments about the existing drawbacks of these models are conducted. Hysteretic rules, relative parameters and the applicability of these models are also discussed in detail. Lastly, some useful suggestions are proposed for the further research.
Research on Calculation Formula of Retaining Wall for Structural Reliability Program Design
Authors: Song Yun Lian , Li Si , Cao Jian Ran
Published: March 2013

Stability problem of gravity retaining wall structure was researched, and a simplified formula of the active earth pressure Ea was turned out for the convenience of the program design. The anti-slide safety factor K0 and anti-overturning safety factor Kc were derived based on different positions of slip plane of retaining wall. This work is the basis of the reliability calculating and program design, for these formulas must be used in anti-slide and anti-overturning safety failure mode in program compiling. On the basis of the known parameters such as wall type, wall dimensions, material parameters, external load, and so on, the program can automatically calculate K0 and Kc, their corresponding failure probability Pf and reliability index β can easily be calculated in later analysis. The research content provide a convenient calculation method, which is used to calculate the Ea and K0 and Kc and Pf and β of the actual retaining walls engineering.
Lateral Stiffness Optimization in Structural Scheme Design of a Super High-Rise Building in 0.30g Seismic Fortified Regions
Authors: Duan Xiao Nong , Tang Neng , Chen Xue Ting , Yang Zhu Juan
Published: March 2013

It was optimized that the lateral stiffness of an under-designed super high-rise building located in 0.30g seismic fortified regions, with 58 stories above the ground and 235.80 meters total structural height. By having adequately adjusted the wall thicknesses of the core-wall and the cross sectional dimensions of the frame columns, a more reasonable structural scheme was obtained. It was then discussed the suitable numbers and heights of the strengthening stories set for controlling the building’s story drifts. Finally, it was explored that the efficiency of seismic input energy dissipation via viscous dampers installed at the right places of the structure.
Triaxial Test and Numerical Analysis on the Fiber Reinforced Laterite Clay
Authors: Zhang Jin Li , Yuan Man , Jiang Zheng Guo , Yang Qing
Published: March 2013

Triaxial compressive tests were performed on laterite clay(LC) reinforced with different fiber contents and lengths. It was observed that the curves of stress-strain have a segmented characteristic at the critical strain. The stress-strain curves of fiber reinforced laterite clay(FRLC) were expressed by the combination of hyperbola and straight lines. The parameters of stress-strain curves were obtained by linear and nonlinear fitting method with experimental results. A three-dimensional calculation model of triaxial tests was developed on the basis of ABAQUS software. To express the stress-strain relationship of hyperbola-straight lines, user’s subroutine was established through secondary development. Based on the test conditions, a large number of calculations were conducted. There is a good agreement between the results of numerical calculations and tests. It shows that the stress-strain relationship of FRLC can be described by the hyperbola-straight line combination model.
Super Arch Dam Seismic Generalized Damage
Authors: Wang Ya Jun , Zuo Zheng , Gan Xiao Qing , Dong Zhi Hong
Published: March 2013

Super concrete dam is threatened by dynamic brittle damage. In this paper, the fuzzy stochastic damping function was established for the seismic damping computation. According to the simulation results, there lives high level of fuzzy stochastic damage stress at the abutments and slope concrete sections of Xiluodu arch dam. Particularly, the stress level in downstream direction and transverse direction is higher than that in vertical direction.
Recent Development of Self-Centering System for Seismic Design of Bridge Piers: Experimental and Theoretical Investigation
Authors: Liu Hui , He Ming Hua , Xin Ke Gui , Guo Jia , Liu Wen
Published: March 2013

The original concept of self-centering system was first proposed under the PRESSS research project in 1991 in UC San Diego. The particularly promising and effective structural solution was initially defined as hybrid system in literature and then self-centering system recently. In the ductile connection of self-centering system, inelastic demand is accommodated through the opening and closing (control rocking) of a pre-existing gap at the critical interface, with no consequent damage such as the plastic hinges in traditional structural elements. This paper provides an overview of the recent advances of self-centering system, especially for bridge piers, to summarize several analytical models and experimental tests that were widely recognized. Besides, a brief introduction of the study conducted by Tsinghua University is presented, including a stiffness degrading analytical model and a series of experimental tests.
Seismic Response Analysis of a Large Span Bridge with Inconsistent Inputs
Authors: Wang Liang , Tao Xia Xin , Liu Hai Ming , Gao Wen Jun
Published: March 2013

Seismic response of a large span cable based bridge with inconsistent inputs is analyzed in this paper. The bridge model is built by the function of finite element software ANSYS. The free vibration characteristics of the bridge are analyzed by Lanczos Vector Iterative method. The first and the twentieth free vibration frequencies are 0.06808 Hz and 0.54392 Hz respectively. A set of motions of consistent, traveling wave and synthesized (inconsistent) are adopted as inputs at the two supports. The lengthwise, lateral and vertical displacements at the span center and quarter span of the main girder, at the tops of the supporting towers, and the internal forces in the girder and at the base of the towers are calculated. The result shows obviously the necessity to take into account inconsistent input in seismic response analysis of large span bridge.
FLAC3D Simulation for Dynamic Response of the Western Slope in Buzhaoba under Explosion
Authors: Xiao Jian Qiang , Luan Long Fa , Wang Jian Guo
Published: March 2013

To study the dynamic response rule of the western slope in Buzhaoba under explosion, a vibrational wave was imposed on the slope. The FLAC3D program was utilized to simulate the rule. The distribution of stress field and the response of velocity were analyzed after blasting. The simulation result shows that the compressive stress increase step by step with the increase of the depth of slope, and as the elevation increases, the particle velocity appears an amplification effect, and the slope is mainly affected by the self-weight stress, and the blasting has little effect on the slope.
The Experimental Research on the Bag-Grouting-Pile Composite Foundation in Coastal Soft Foundation Treatment
Authors: Wang Dong , Cao Jia
Published: March 2013

As a new ground treatment technology, the bag-grouting-pile composite foundation is used in railway soft soil reinforcement. In this paper, the application effect of bag-grouting-pile in coastal soft foundation treatment was studied in this experimental research; the deep settlement and the deep horizontal displacement of embankment edge in bag-grouting-pile composite foundation are tested in the research. The results of research show that the bag-grouting-pile composite foundation is a cost-effective ground treatment technology using in coastal soft foundation treatment.
The Experiment of Deformation and Internal Force of Soft Pipeline Caused by Subsoil Settlement
Authors: Zhang Xu , Bai Xiao Hong , He Wu Bin
Published: March 2013

Through the model test in soil slot,the process of deformation and destruction of soft pipeline caused by subsoil settlement is simulated and observed in lab. Based on the experimental data, the curve as the internal force of pipeline is first drawn out and discussed, in turn the characteristic of stress distribution and destruction rule of pipeline are analyzed and summarized, which may be referred for designer to take appropriate measures. The experimental results show that the internal force and deflection of the pipeline increase with the depth and width of the hole below the pipeline. When the hole depth (h)/ pipeline diameter (D) =2.5, internal force and deflection changes only associate with the width of the hole (b). And when b/D =6, the pipeline can not work normally and even be destroyed. The experimental conclusion can provide the basis for the security of underground pipeline.
Numerical Investigation on Passing through Goaf in Coal Mine Failurezone
Authors: Deng Bao Ping , Liu Shuai , Wang Chen , Jiang Yao Dong , Wang Hong Wei
Published: March 2013

Random mining by small coal mines left many destruction districts with a large range in Fenxi mining district. According to incomplete statistics, the destroyed areas by small coal mines amount to nearly one hundred square kilometers and have over three hundred million tons of resource reserves in Xinliu, Xinyu and Xinyang these three fields. Small coal mines tend to use outdated techniques such as replacing mining with advancement, small excavation with large stoping and room pillar mining technique, which have a stoping rate of only 10% to 25%. Some of the wellheads were not closed seamlessly, which resulted in self-combustion; some were damaged due to the mining of the lower coal seam. A serious security risk existed during the mining of the lower coal seam due to the uncertainty of gas, water and roof pressure. In addition, the destructed area by small coal mines is badly large in Shanxi Province and even the whole country which remains a huge amount of resources. The implementation of this subject is significant.
Coupled Numerical Simulation Research on Dewatering and Land Subsidence in Deep Foundation Pit
Authors: Zhang Dong Dong
Published: March 2013

With the construction of deep and large foundation pit, land subsidence disasters caused by dewatering in deep foundation pit become very serious. Using the coupled model of foundation pit dewatering and land subsidence and putting it into foundation pit dewatering construction, analyzes and summarizes the effect of land subsidence in space and time, which will provide references for the design and construction of foundation pit dewatering.
Study on the Remediation of Mud-Pumping
Authors: Liu Dong , Fu He Lin , Zhu Xian Zhen , Liu Yun Si , Rao Jun Ying
Published: March 2013

In this paper, we had a field test study in mud-pumping of the subgrade. During the experiment, from the process and the parameters, and based on the laboratory tests, a series of tests on the soil at the mud-pumping of the subgrade have been done before and after the improvement of the physical parameters.Studies show that the adopted materials, processes and parameters to be successful.
Ionic Liquid 1-Butyl-3-Methylimidazolium Chloride/FeCl3 Pretreatment of Sugarcane Residue for Second Generation Bioethanol Production
Authors: Li Qiang , Fei Juan Juan , Gu Xu Ding , Ji Geng Sheng , Liu Yang , Shi Jun , Wu You Ting
Published: March 2013

This study aims to establish a natural cellulosic biomass pretreatment process using ionic liquid (IL) for efficient enzymatic hydrolysis and second generation bioethanol. The IL 1-Butyl-3-methylimidazolium Chloride/FeCl3 ([Bmim]Cl/FeCl3) was selected in view of its low temperature pretreatment ability and the potential of accelerating enzymatic hydrolysis, and it could be recyclable. The yield of reducing sugars from sugarcane residue pretreated with this IL at 80 oC for 1 h reached 46.8% after being enzymatically hydrolyzed for 24 h. Sugarcane residue regenerated were hydrolyzed more easily than that treated with water. The fermentability of the hydrolyzates, obtained after enzymatic saccharification of the regenerated sugarcane residue, was transformed into bioethanol using Candida shehatae. This microbe could absorb glucose and xylose efficiently, and the ethanol production was 0.38 g/g glucose within 30 h fermentation. In conclusion, the metal ionic liquid pretreatment in low temperature shows promise as pretreatment solvent for natural biomass.
Preparation of Ammonium Polyphosphate by Melamine as Sole Condensing Agent
Authors: Liu Yue Long , Chen Wen Yan , Liu Gou Sheng
Published: March 2013

Ammonium polyphosphate (APP) is usually synthesized by heating diammonium hydrogen phosphate and phosphorus pentaoxide at ammonia atmosphere, in which phosphorus pentaoxide is used as condensing agent. In this paper, a new process is pointed out in which APP is synthesized by heating diammonium hydrogen phosphate and melamine to a certain temperature at ammonia atmosphere, melamine is used as the sole condensing agent, the XRD patterns of synthesized product are investigated and discussed in detail. The results are informative for controllable preparation of APP in industrial production.
A Novel Simplified Model Approach for Fiber Modified by 1-D Nano Techniques
Authors: Zou Qiang , Liu Wen Tao , Zhu Zhe , Ma Jian Guo
Published: March 2013

A novel combination of optical fibers and one dimensional (1-D) ZnO nanobelts is presented. Three samples were produced in different heat treatment (300°C and 600°C). A new model was introduced to study silica optical fibers. It was found that the green photoluminescence (PL) of samples is obvious but shows some changes in respective atmosphere. Different buffer layers of polyvinly alcohol (PVA) and ZnO thin film are main factors leading to the differences in PL spectrum. These results support that the novel optical fibers obtained by 1-D ZnO nano-material are available and may lead us another road to self-luminous optical fibers.
Preparation and Properties of Carbon Nanotubes Reinforced Cu Matrix Composites for Electronic Packaging Application
Authors: Xu Long Shan , Chen Xiao Hua , Liu Xing Jun
Published: March 2013

Multi-walled carbon nanotube (MWCNT) reinforced copper nanocomposites were prepared using a unique spherical MWCNT-implanted copper composite powders. The MWCNTs are homogenously ‘locked’ in the composite and tightly bonded to the matrix, which makes them play excellent reinforcement role on the microhardness compared with the unreinforced pure copper. Although the thermal conductivity is not enhanced for the thermal resistance between the carbon nanotubes and the copper matrix; it is still high enough to be used as electronic packaging materials even the concentration of MWCNTS in the composite is up to 5 wt%. Furthermore, the thermal expansion of the composites decreased apparently with the addition of the carbon nanotubes.
Analysis on Affecting Factors of Slab Surface Transversal Corner Crack for Medium-Carbon Steel with Boron in Continuous Casting
Authors: Peng Qi Chun , Tong Zhi Bo , Fan Dan Ping
Published: March 2013

Based on the production practice of boron microalloyed medium-carbon steel, oscillating curve, cooling water flow in mould, secondary cooling system and arc alignment precision, rolling gap precision on transversal corner crack in slab was analyzed, and the corresponding control measures were put forward. Such as: Stabilizing the [S] and making w(S） less than 0.015%; Increasing Mn/S, and making the Mn/S was not less than 37.6 in A36-LB; Strictly controlling the w(Ca)/w(Als) was more than 0.09. Decreasing stroke 1mm and improving frequency to reduce negative sliding time 32%; Stabilizing cooling water around 4000/380 L/min, less cooling, reduce the total water cold water and 50% Side water; Testing rolling gap termly, strengthening maintenance and Replacing bad roller column to make sure precision in the reasonable scope, the measures above suppressed the corner crack in slab effectively, and it’s degradation ratio and quality disputes were below that of Q235B in the mouth production level.
Calculation of the Mg-Gd-Y Alloy Equilibrium Phase Diagram and its Verification at 450°C
Authors: Guo Yong Chun , Sang Ying Ming , Li Jian Ping , Yang Zhong
Published: March 2013

The Mg-Gd alloy, Mg-Y alloy equilibrium phase diagram has been characterized using the multiple phase equilibrium calculation software (Pandat) and the magnesium alloy thermodynamic database. The Mg-Gd and Mg-Y diffusion couples were made by the rivet method. According to the local balance principle, these diffusion couples were processed using an equalization treatment at 450 °C, followed by EDS analysis with a scanning electron microscope. The results show that a concentration gradient resulting from atomic diffusion is apparent in the Mg-Y and Mg-Gd diffusion layer, showing that the diffusion layers belong to different phases. There are 5 two-phase regions and 2 single phase regions in the Mg-Gd diffusion layer and 4 two-phase regions and 2 single phase regions in the Mg-Y diffusion layer. These results are consistent with the data from the phase equilibrium calculation. This research can provide experimental support for the Mg-Gd-Y three element alloy phase diagram calculation.
TEM Study of FePt and FePt:C/FePt Composite Double-Layered Thin Films
Authors: Jin Ling Fang , Li Xing Zhong
Published: March 2013

New functional nanocomposite FePt:C thin films with FePt underlayers were synthesized by noneptaxial growth. The effect of the FePt layer on the ordering, orientation and magnetic properties of the composite layer has been investigated by adjusting FePt underlayer thickness from 2 nm to 14 nm. Transmission electron microscopy (TEM), together with x-ray diffraction (XRD), has been used to check the growth of the double-layered films and to study the microstructure, including the grain size, shape, orientation and distribution. XRD scans reveal that the orientation of the films was dependent on FePt underlayer thickness. In this paper, the TEM studies of both single-layered nonepitaxially grown FePt and FePt:C composite L10 phase and double-layered deposition FePt:C/FePt are presented.
Experimental Study on Frost-Resistance Property of Waste Rubber Aggregate Concrete
Authors: Yu Qun , Yang Chun Feng , Ye Wen Chao
Published: March 2013

The experimental using quick frozen method to study the frost-resistance property of waste rubber concrete. Sand was replaced by waste rubber at equal volume substitution ratio divided into 5%, 10%, 15% and 20%; and rubber particle diameter is divided into 2-4mm, 60-80 mesh and 30-40 mesh. The test results show that: the frost-resistance property of waste rubber concrete could meet the specification of design requirements, the antifreeze level is higher than the matrix concrete, and the frost-resistance property improve with the reduce of rubber particle size, the best substitution ratio of rubber aggregate is about 10%.
Compressive Strength and Flexural Properties of High Performance Nano-Binder Cementitious Composites
Authors: Gao Xiang , Li Qing Hua , Xu Shi Lang
Published: March 2013

High performance nano-binder cementitious composites (HPNCC) are ultra-ductile fiber reinforced cementitious composites with special matrix. The compressive strength and flexural properties of HPNCC containing nano-SiO2 particles were investigated at age of 3d, 7d, 14d and 28d. According to the results, HPNCC exhibited excellent mechanical properties in the test. The compressive strength, flexural strength and first crack strain of HPNCC were all increased obviously at early age except the ultimate strain. In the flexural test, both crack extension width and the number of fine cracks decrease along with the curing age. However, the average crack spacing has no remarkable changes. Nano-SiO2 particles in HPNCC acted as ultra-fine fillers and catalyzers to strengthen the interfacial bond between the matrix and PVA fiber which improved the mechanical properties and would make HPNCC be widely used in the engineering.
Analysis of Phosphogypsum’s Physical and Chemical Properties and Making of Anhydrite Cement from Phosphogypsum
Authors: Zhou Jie , Yang Lin , Lin Qian , Cao Jian Xin
Published: March 2013

The phosphogypsum (PG) sample produced as the waste of the phosphoric acid fertilizer plant from Guizhou, China was studied for its properties and as a material for anhydrite cement. The impurity content, type and distribution, as well as thermal behavior and solubility of the PG were carefully studied by XRD, DTA techniques and gravimetric determination. The China Standard GB175-2007. The mineralogical studies were physical properties of the sample were studied as per the determined by XRD. The results showed that the impurities of PG are mainly water-soluble P2O5, F, organics and P2O5 and F in the gypsum lattice which has entered in to solid solution with gypsum as well as the insoluble Ca3(PO4)2 and CaF2. Experimental datum showed that a suitable anhydrite can be produced by heating PG at 1000 °C and PG up to 60% used can be as a main raw material in production of anhydrite cement.
Analysis of Fused Magnesia Production Process with 3000kVA Electric Arc Furnace
Authors: Qi Guo Chao , Shan Feng Jun , Li Qiang , Yu Jing Yuan
Published: March 2013

The present study is related to a process development for producing high purity fused magnesia. A newly designed 3000 kVA electric arc furnace is used in the field experiment. The electric resistance characteristic of fused magnesia is analyzed and the effect of electrode diameters and electrode depth buried in molten magnesia on melting electric resistance and electric arc heat conversion are discussed in detail. It shows that, for the new 3000 kVA electric arc furnace, 350~450 mm diameter electrode and ~300mm depth in molten magnesia are suitable.
The Viscosity Model of Ti-6Al-4V Feedstocks in Metal Powder Injection Molding
Authors: Fu Jun Yu
Published: March 2013

Power Law Model and Cross Model are widely used in Metal Powder Injection Molding computer simulation analysis. The feedstock viscosity data of Ti-6Al-4V is got through field tests, regression analysis is used to calculate the model parameters, which provides the theoretical basis for the application of computer simulation analysis in metal powder injection molding.
The New Technical Research on Joining Veneer
Authors: Wei Wen Bang , Li Li Na , Xiang Liu , Zong Zhao , Heng Zhao , Li Xue Fei , He Chuan , Zhang Shuang Bao
Published: March 2013

Veneer horizontal consolidation machine new technology mainly adopts machine vision of some control detection method based on machine vision I tried to the detection device used in the production process of veneer joining together. The basic principle of this new technology is in veneer test, using image sensors to collect veneer size and defect status, again through the system of image sensor OCR size, shape, veneer characteristics, pixel parameters, such as calculated by measuring, discriminate veneer appearance of the manifestation of the specimen of veneer characteristics of processing judgments and will test results signal to PLC control system, by the system control device of crack and holes etc do not accord with the requirement of veneer for cutting, finally complete joining together.
An Experimental and Numerical Hybrid Technique for Analysis the Fracture Behaviors in Natural Fiber Reinforced Composites
Authors: Shen Min , Liang Dong Chao , Liu Yang , Duan Yan Li
Published: March 2013

Natural fiber reinforced composites have become excellent candidates for automotive applications and civil engineering facilities. The design procedures will require precisely evaluating the toughness of the materials, which demand accurate measurements of strain or displacement that are difficult to obtain for ductile materials. The primary objectives of this paper were to develop reliable experimental approaches which can effectively evaluate the fracture behaviors of random short natural fiber reinforced polypropylene (PP) composites. The digital image correlation method (DICM) was applied to compute the deformation fields around the crack tip of a compact-tension specimen in a process of loading. An experimental and numerical hybrid method was used to describe the fracture behaviors of the composites. The relationship between the micro-structure of random fibers and the macroscopic mechanical properties of the composites can also be understood.
Drilling Technologies of Golden Ore District at Victoria Lake in Tanzania
Authors: Zeng Shi You , Cai Ji Hua , Gu Tian Ben , Tian Min
Published: March 2013

Greenstone belt golden ore prospecting project at Victoria Lake in Tanzania consisted of seven boreholes and a total of 2500 meters of drilling. In fact, twelve boreholes were completed and a total of 3201.2 meters of drilling were realized. It created our record of maximum drilling meters and drilling production in five months using one drill rig. The paper introduces drilling technologies used on this district from the aspects of geographic and geological overview, drilling equipments, drilling technologies, drill bit, drilling mud and main economic indicators. It may offer guidance for drilling in similar districts.
Recognition of Coal and Gangue Based on X-Ray
Authors: Zhao Yi Ding , He Xiaoming
Published: March 2013

In this paper,a recognition method of coal and gangue based on x-ray is studied. With the different density , the coal and gangue on a belt can be detected by x-ray. After penetrated by x-ray, with the acquisition of ray signal and image analysis, the gangue can be accurately distinguished from the coal. As a result, the quality of coal is improved. Proved by experiment, this method is more efficient and accurate than other methods.
Review of Materials for Energy Saving Technology
Authors: Jiao Yan Hui
Published: March 2013

During the last 20 years, interest in the closed adsorption heat pump and refrigeration systems has increased steadily. In this paper, consideration is given to aspects of adsorption refrigeration in terms of existing materials used in adsorption refrigeration, heat transfer characteristics of materials, and cost of materials and manufacturing. The heat and mass transfer play very important roles in improving the cycle performances and their optimization is one of the technological challenges in developing adsorptionrefrigeration systems. In order to optimize an adsorber it is essential to control unconsolidated adsorbers; coated adsorbers and consolidated adsorbers. The paper is a general review of adsorption refrigeration technology and provides information of value to those involved with heat pump and refrigeration systems technology.
The Effects of Electrolyte on the Aluminum Laminate Foil and the Lithium Ion Battery Corrosion
Authors: Zheng Yu Ying , Fu Cheng Bo , Huang Wen Tao , Sun Ming
Published: March 2013

Lithium ion second battery has been grabbing an increasingly larger market share in recent years, and more lithium ion battery uses aluminum laminate foil to separate the cell from the environment. The adhesion strength of the Al layer and polypropylene layer will affect the battery quality, if the adhesion strength is so little that it should lead the battery delamiation in the process of heat sealing, and some of the aluminum laminate will corrosion in a short time and lead the battery scrap quickly.