bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on BAF Lipid Phosphorus Biomass and SOUR Active Tests
Authors: Yu Xin Gang , Wu En Shen , Han Zeng Min
Published: February 2012

By taking the fillings from the wastewater treatment reactor of a practically stable operation of the BAF, it is to test the lipid phosphorus biomass both in the bio-film and floc in the fillings, and active changing laws of microbes. The experiments show that BAF sewage treatment results from the joint action of bio-film and biological floc. The experiments provide theoretical foundations for the operating mechanism of BAF, packing height and the optimization of backwash time. Due to its high efficiency, energy saving, small area, easy operation and management, Biological Aerated Filter (BAF) technology has become a research focus[1] of a biological wastewater treatment technology in recent years. BAF process is characterized of a lot of filler in the activated sludge, besides the bio-film on the fillings. This sludge contains active living organisms, shed bio-film, suspended matters from the raw sewage and other adsorptions from the wastewater. They are collectively referred to as biological floc. When oxidating and decomposing organic matters in the sewage, it intercepts and adsorb sunken substances. Throughout BAF operation process, it is as irreplaceable as the bio-film.
Optimized Utilization of Station Arrival and Departure Tracks for Passenger Dedicated Lines
Authors: Qiao Rui Jun , Zhu Xiao Ning , Yan Wei
Published: February 2012

For running trains according to timetable, it is very important to arrange appropriate arrival and departure tracks to trains transacted by passenger dedicated line station. Builds optimized model of arrival and departure track utilization, the optimization objective is maximizing the sum of weights of trains using tracks, and having the most balanced utilization schedule. For constraints, it is different from existing railway station that the two turnaround trains share the same train-set must be arranged to the same arrival and departure track, and this paper considers the constraint seriously. Taking Beijing South Railway Station inter-city yard as an instance, use the method put forward in this paper to calculate the arrival and departure track utilization schedule. Compared with existing schedule, the result calculated makes the arrival and departure track utilization more balanced.
The Quadratic Trigonometric B-Spline Curve with a Shape Parameter
Authors: Li Jun Cheng , Chen Guo Hua , Yang Lian
Published: February 2012

A quadratic trigonometric B-spline curve analogous to the standard quadratic uniform B-spline curve, with a shape parameter, is presented in this work. The shape of the proposed curve can be adjusted by altering the value of the shape parameter while the control polygon is kept unchanged. With the shape parameter, the quadratic trigonometric B-spline curve can be closer to given polygon than the standard quadratic uniform B-spline curve. The proposed curve can be used to accurately represent the ellipse.
Synthesis and Inhibition Performance of Two Imidazoline Corrosion Inhibitors with Different Hydrophilic Groups
Authors: Fan Guo Dong , Cui Meng Ya
Published: February 2012

Imidazoline quaternary ammonium salt (IM) was synthesized in this paper by maize oil, 2-(aminoethylamino) ethanol and benzyl chloride. Then it was modified by urea and thiourea to obtain IM-O and IM-S respectively. The products were analyzed with IR spectrum and 1HNMR spectrum. The corrosion inhibition performance of IM-O and IM-S was evaluated by weight-loss measurement of A3 steel in hydrochloric acid. The compare research in the concentrations of the corrosion inhibitor, the concentrations of hydrochloric acid, the temperature of pickling, the time of pickling and the concentrations of Fe3+ were done. The results show that the two compounds are good inhibitors for A3 steel and the IM-O has stronger corrosion inhibiting ability than IM-S.
Semi-Physical Simulation Experiment System of Fuel Control System for an Aeroengine
Authors: Gao Shuang Lin , Zhang Shi Ying , Luo Lei , Gao Peng
Published: February 2012

Abstract. The thermodynamic model of an aeroengine was established. The laboratory working condition of the fuel controller, fuel flow proportioner and low-pressure fuel-feed system of an aero-engine were built. The mathematic model of the aeroengine was run in the computer. Using RS422 Bus technology, the semi-physical simulation experiment system of the fuel control system for the aeroengine was established with engine model. And then the experiment results demonstrate that the semi-physical simulation experiment system can simulate the transient state and steady state for the aero-engine effectively. These results lay a solid foundation in the further research of the FADEC system for engine and the application of advanced control theory to control system of engine.
CFD Studies on Velocity Distribution of Air in a Swirling Fluidized Bed
Authors: Faizal Mohd , Suzairin Md Seri , Al-Hafiz Mohd , Raghavan Vijay Raj
Published: February 2012

This paper presents computational fluid dynamics (CFD) studies to characterize air velocity distribution for various bed configurations in a swirling fluidized bed (SFB). Unlike conventional fluidized beds, a SFB provides radial mixing which is desirable is fluidization. Three velocities components were observed, the tangential velocity, radial velocity and axial velocity. These velocities were created as a result of using annular blade type distributor which mimics the turbine blades. In actual industrial applications, the axial velocity will create fluidization while the tangential velocity provides swirling effect. The presence of radial velocity can be explained as a consequence of centrifugal force generated by the swirling gas. Understanding these velocity distributions will enable optimization of the annular blade distributor design towards a high efficient fluidized bed system.
Risk Analysis of BOT Finance Mode on Hydropower Projects Based on Analytic Hierarchy Process – Case Study of Xi He Hydropower Station in Anhui Province
Authors: Wang Yan , Wang Song Jiang
Published: February 2012

Using AHP method, this paper proposes a risk evaluation index system to analyze the risky factors concerning the BOT financing mode for Xi He Cascade hydropower station on the basis of an quantitative and qualitative analysis. Research shows that the AHP methods can serve as an effective tool to risk evaluation and management of hydropower projects.
Study on Calculation Method of Two-Part Heat Price
Authors: Wang Li Mei , Wang Zhen Hai
Published: February 2012

Two-part fee originated in managerial economics, variable costs and fixed costs through the data can be calculated based on the price of two thermal heating costs and measurement of the ratio of heat costs and final heat price.
Research on Plasticity Shaped Technology of Rear Axle Gear of Motorcar
Authors: Yu Jin Wei
Published: February 2012

Rear axle spiral bevel gear of motorcar, as its special shape structure , alveolar much deeper than straight bevel gear , and has spiral angle effect , therefore, extrusion of rear axle gear than extrusion of straight bevel gear is much more difficult , deal with the problems, have made closed extrusion new technology of rear axle gear , designed new type die structure, die adopt fluctuateing concave model level bisection ， pre-stressed composite concave model structure , concave model and model core floating , parts have no fly side , tooth surface can reach the level of rough milling ,higher production efficiency and life of die , satisfied production requirements. Process test showed that compared with the open die , required extrusion distortion force reduced 50% , increase material utilization 15%, debase electric power consumption 50%, with significant economic benefits .
Research on Technology of Variable Spindle Speed Noncircular Turning
Authors: Cao Hui , Liang Ning , Zhang Na
Published: February 2012

To improve the stability and precision of noncircular manufacture process, the variable spindle speed turning is applied to noncircular turning process. The variable spindle turning system is designed. The character of variable spindle speed is analyzed. The linear servo unit available for variable speed noncircular turning process is designed. An active disturbance rejection control technique is applied to servo unit. The experiment results show that surface quality and tracking error of variable spindle speed noncircular turning are better than constant speed machining. The linear servo unit is able to track the desired trajectory of cutting tool motion.
The Research of Motion Detection and Shadow Elimination in Video Surveillance
Authors: Qing Zhi Li , Chen Yue Lin
Published: February 2012

This paper studies the moving objects detect and shadow eliminate in video surveillance. Completed the background generated on the video image by study the mixed Gaussian background model, by transforming the image to hsv color space for processing, which achieve the elimination of shadows. The experimental results show the approach this paper use is effectively on the background generated and shadow remove.
Probabilistic Access Based Call Admission Control in Multi-Traffic CDMA System
Authors: Luo Xing Guo , Wang Shan Shan , Li Peng
Published: February 2012

An efficient Call Admission Control (CAC) arithmetic is essential to guarantee QoS for enhancing the utilization of radio resource in multi-traffic CDMA systems. This paper presents a Multi-Class Services Dynamic Mixed Judgment CAC arithmetic. This arithmetic judges a new coming call whether to accept or not based on the remaining resource, the priority of all services and the resource reservation for high priority. When self-similar service is coming, it uses probabilistic access. The results show that this arithmetic can keep better performance.
Pull-in Instability Behaviour of Nanoscale Actuators Using Nonlocal Elasticity Theory
Authors: Peng Jian She , Luo Guang Bing , Yang Liu , Yang Jie
Published: February 2012

This paper modified the linear distributed load (LDL) model for cantilever nano-beams . A linear load model which suits boundary conditions was proposed to approximate with nonlinear intermolecular and electrostatic interactions. In the modified LDL model, under considerating the effect of the small scale, the pull-in instability behaviour of nano-actuators subjected to an electrostatic force and intermolecular force had been investigated. The results showed that the modified LDL model is more consistent with the actual situation than LDL model.
Study on Construction of Close-to-Nature Man-Made Plant Landscape Based on Natural Plant Communities: the Case of West Lake Scenic Area in Hangzhou
Authors: Lu Shan , Chen Bo , Hu Shao Qing , Zhang Jing Jing , Jiang Jun Hao , Shen Shan Shan
Published: February 2012

Urban close-to-nature plant community is a sustainable design and construction philosophy of landscape greenbelt planning. However, there is no explicit guide for constructing close-to-nature plant community Based on the analysis of community structure and characteristics of 10 typical natural plant communities in the West Lake Scenic Area in Hangzhou and summary of the features of natural community, as well as the analysis of plant landscape of Hangzhou Huagangguanyu Park to prove that the close-to-nature man-made plant community and natural plant community are interrelated in respect of vegetation composition and community structure, this paper puts forward to the essential construction methods of the close-to-nature landscape community, providing theoretical basis for research and construction of urban close-to-nature landscape plant community in China.
An Advanced Vehicle Night Driving Assistance System Based on the DaVinci Platform
Authors: He Jia , Ren Rui Qiang , Rong Hui
Published: February 2012

The paper will mainly work for the establishment of advanced vehicle night driving assistance system based on the DaVinci™ platform., which including the adaptive front lighting subsystem, the infrared night vision lighting subsystems and the embedded processing platform. The implementation and system integration applications of the adaptive front lighting technology based on driving behavior and the infrared night vision technology are main research objects. Through intelligent auxiliary lighting and enhance vision, driver awareness at night and road safety are significantly improve.
Research for the Risk Structure of Large Design Enterprise’s Projects Based on Hard System Methodology
Authors: Yin Qin , Dong Bo , Wang Liang
Published: February 2012

In this paper, we use the analysis of the time, knowledge and logic attributes of the risk, furthermore, to define, recognize and classify it based on the identification of the risk of large design enterprise project. We also put forward the thought and basic methods of building hall structural system of complex project risks, using it to establish hall structure system of large design enterprise project risks and point out the support that the system will provide for the risk assessment and strategy choice.
Research of Core Characteristics of Search Coil Magnetometer
Authors: Yu Qun , Zhang Hou Bo , Lin Guan Nan
Published: February 2012

In this paper, the theory of apparent permeability and effective permeability of the core is described. The apparent permeability with coil in different positions of the core is investigated and simulated by HFSS. The best location of the coil is determined according to the curves of the apparent permeability. The relationship between the effective permeability and aspect ratio of the core is investigated and compared with the theoretical derivation, verifying the accuracy of theoretical analysis. Specification of core in shape is solved. Core losses are further discussed. Quantitative analysis of core losses is obtained.
The Empirical Identification and Analysis of Key Risk Factors of Inventory Financing
Authors: He Juan , Liu Miao Miao , Wang Qun Zhi
Published: February 2012

Considering that there lacks study on the empirical identification and analysis of key risk factors of inventory financing, this paper uses SPSS to analyze the reliability and the validity of research data, revising the original index variables and sorting out the main risk factors, and finally establishing an ideal risk evaluation index system. The results of this paper provided a new research framework for risk identification of inventory financing.
Application of Remote Sensing on Monitoring of Forest Fire
Authors: Zhang Jian Huan , Lin Shan , Kong Ling Hua , Chen Yan Ping
Published: February 2012

Remote sensing (RS) technology plays a most important role in forest fire monitoring. This paper reviews the application of satellite remote sensing, and introduces sensors which are commonly used for fire monitoring. The advantages and disadvantages are discussed by comparison and the paper specifically focuses on the application of RS based pre-fire forecast and pro-fire evaluation. With the help of this paper, the development of this technology could be well acknowledged, and it can therefore be believed that remote sensing would play a more important role in fire monitoring in the future.
Research on Efficiency of Physical Capital and Human Capital in China's Economic Growth
Authors: Li Xing , Wang Liang , Wu Bang Yuan
Published: February 2012

Research on economic growth in the past concerns only with physical capital and human capital in the absolute amount of effects at the expense of the efficiency of the present situation, we use the 1981-2008 China's annual time-series data, with uniform measurement to build econometric models to study China's economic growth in the efficiency of physical capital and human capital. Our research results indicate that in the long term, human capital is of much higher output efficiency than physical capital; In the short term, increased input ratio of human capital causes average labour output to grow sustainably, and increased input ratio of physical capital only between the 1th and 2nd period dues to rapid increase in average labour output and then declined rapidly.
Research on Automobile Transmission Comprehensive Performance Test Experiment Equipment
Authors: Qiao Feng Li
Published: February 2012

Automobile transmission is a very important part of automobile, and the comprehensive experimental Testing Bed of automobile transmission has realized the comprehensive performance test of four kinds of types’ automobile transmissions. This text has recommended design, operation principle, characteristic and how to realize the system of comprehensive experimental testing Bed of automobile transmission. This testing Bed adopts electromechanical unify principle. It realizes four manual transmission being changed into given and stock automatically. Meanwhile it adopts Labview software as the developing testing Bed, realizing be controlled frequency conversion speed regulator, Step-servo motor, magnetic particle loader, clutch, etc. by computer at the same time. This testing Bed also measures torque, rotational speed in real-time on input axle and output axle of the transmission.
Research on Consumer Credit Assessment of Power Enterprises Based on FAHP
Authors: Jia Zheng Yuan , Huang Zhi Wei
Published: February 2012

For the shortcomings of AHP, this paper has come up with a method of fuzzy analysis hierarchy process based on triangular fuzzy number. This assessment method uses fuzzy numbers to reflect the ambiguity of expert evaluation, to weaken the subjectivity of the simple use of AHP method and to quantify the weight of power customer credit property calculation, and the evaluation results becomes more objective. Through examples, it is shown how to practically apply the method.
Research on Identification Technology for Weak Signals’ Development Trends of Crop Leaves’ Water Potential Based on Wavelet Theory
Authors: Zhang Cui Min , Wang Jing Hua
Published: February 2012

At present, the agriculture in China is severely short of water, which turns water-saving agriculture into a must due. The basic principal of water-saving agriculture is to monitor the crop water potential on time and establish a closed-loop control system. The reality of accurate irrigating is due to the water requirement of the crop. In this way, obtaining the accurate water potential is the key technology for water-saving agriculture. However, the crop water potential and sophisticated field surroundings are relatively weak signals. In this paper, the signals are pretreated. Then the authors identify the signals of the crop water potential from the noised-signals and predict the grow trends by wavelet decomposition and reconstruction. The simulation result proves that the method could basically reflect the trend of desired signals, which is an effective analysis.
Research on the Movement Effect of Coal Group’s Industrial Structure
Authors: Yang Chang Hui , Cao Feng Juan
Published: February 2012

As the non-renewable resources, coal plays an important function in economic development. Just because of the non-renewable nature, coal enterprise will adjust its industrial structure in development process. Based on the calculated model，this paper present the calculation and analysis of the movement effect of Coal Group’s industrial structure, and the dynamic process has been pointed out.
Study on Flight Command and Training Simulation System about Aircraft
Authors: Hu Chao Jiang , Liu Chang Wei , Ma Qiao Bing
Published: February 2012

A scheme of Flight Command and Training Simulation System about Aircraft has been put forward and a prototype has been developed based on the technique of three-dimensional digital terrain elevation, flight simulation and automatic generation of flight route. One can not only study and grasp preliminary knowledge about flight command and training independently with the automatic generation function of flight route of the system, but also can get almost real flight command and training experience when flight mission routes are generated with the fight simulation platform of the system. So the system can meet one’s requirement of learning and grasping flight command and training knowledge very well.
Research on International Standards of Gas and Material Compatibility in Cryogenic Vessels
Authors: Fan Shu Ling , Zhang Lan Zhu , Hu Hui , Shi Feng Ping , Teng Jun Hua , Zhou Wei Ming
Published: February 2012

To ensure cryogenic vessels working safely and efficiently is a common focus for governments, manufacturers and customers. Chinese national standard system of gas and material compatibility in cryogenic vessels has still not be build. It is necessary to make a research on international standard about it. In this paper, the main international standard of gas and material compatibility in cryogenic vessels and the international standards of ignition test methods were described.
Research on Microcomputer Control System for Spherical Surface Grinder of Engine Valve Tappet
Authors: Hao Jian Jun , Cheng Chang , Zhang Zhi Gang , Ge Shuai Shuai
Published: February 2012

We propose a new control scheme based on analyzing the problems existed in the original machine tool. We use single chip Microcomputer as controller, stepper motor to drive machine table, and power monitor for grinding contact detecting. The principle of grinding contact detection was elaborated, the structure of computer hardware and software are presented. The developed control system has been used for machine. The results show that the control system runs properly and achieves the desired effect.
Stresses of Existing Pavement Induced by Widened Embankment over Soft Soils
Authors: Zhao Min
Published: February 2012

Widening of existing highway embankments can improve their capacities and ease the high traffic pressures, but it may cause a series of engineering problems including longitudinal pavement cracks, drop off or even local or global instability of embankments especially those on soft soils. How to prevent severe cracks occurring on pavement induced by widening of the existing embankments has been a great concern of geotechnical engineers. A numerical analysis by using a commercial FEM program was conducted to investigate the influence of the thickness of foundation soils on the development of transverse stress in the pavement of the existing and widened embankments. The effect of widening time on the stress was also discussed. The results indicate that compressive stress will be caused in the existing pavement prior to the widening, while considerately lager tensile stress will be induced in the existing pavement after widening. In the view of reducing pavement tensile stress, a most suitable time to begin widening was proposed for engineering practice.
Adaptive Internet-Based Online Courses Research
Authors: Wang Yu Hong , Tang Yan Xia , Liu Jia Jun
Published: February 2012

[Purpose] This paper explores the problems in online courses. It gives suggestions which are self-adaptive courses generation, network concepts, content, learning content and composition of the learning process requirements. [Method] These methods are used, which are theoretical research, systems analysis, functional development and design, environmental testing, experimental control and other methods etc. [Results] The existing online courses follow the traditional mode of teaching and the learning content can not differ from person to person. The course content and network resources can separate from each other, limiting the learner's learning behavior and effects, limiting the learner's effective use of network resources. Therefore, the network self-adaptive courses are the online courses which can meet the requirement of learners who have different cognitive and learning styles. If a learner can learn according to their existing cognitive structures and learning experience, his/her learning effect and probability of success is significantly larger than the external imposition of learning. [Conclusions] Adaptive network is a kind of new course format which is Internet-based content dissemination activities, according to different learners at different levels of cognitive structures generated for different learners to learn the content, to maximize the use of a variety of learning tools to support different learning styles and different learning behavior.
Analysis and Attack of Two Ring Signature Schemes
Authors: Wu Lei
Published: February 2012

A ring signature scheme enables a signer, in an ad-hoc manner, to sign a signature on behalf of a group of users including himself such that a verifier can be convinced that one of the identified users actually generated the signature but he can not identify the signer. In this paper, we analyse and attack two ring signature related schemes, including a ring signature scheme and a ring signcryption scheme, we prove that they can not satisfy the property of unconditional anonymity, and are all insecure.
Design and Development of a Test Platform for Performance of Variable Speed Control Switches in Power Tools
Authors: Yu Wang , Pu Jue , Ye Jun Rong , Li Qian Kun
Published: February 2012

The characteristics of switches have great influence on the performance of power tools. A test platform was designed and developed to test the performance of variable speed control switches in power tools, in which 3 kinds of modes can be conducted, i.e., life cycle test, lock rotor test and current step test. The test results showed that the platform was feasible, and very helpful for understanding and furthermore improving the characteristics of switches during different working situations.
Calculation Method of Mechanical Face Seal Temperature Based on Heat Conduction Angle
Authors: Gao Jie , Song Peng Yun , Hu Xiao Yun , Ma Fang Bo
Published: February 2012

It is a key technology in the design and application of mechanical seals as how to determine and control its face temperature. According to the explicitly defined heat conduction angle, supposed the surfaces of the stator ring are insulation, and the heat produced by friction of seal faces transfers only through the rotor ring along the heat conduction angle, an approximate analytical method calculating the end face temperature distribution of mechanical seal was developed for mixed friction condition in this paper. The heat conduction angle, angular velocity, contact pressure and other factors and its law on end face temperature distribution have also been analyzed in this paper. The results of this method for calculating the end face temperature are much closer to the reality, compared with other approximate analytical methods.
Allelopathy and Preliminary Separation of Allelopathic Substance in the Extracts of Wheat Seed Germination
Authors: Bai Jing Wen , Wang Jing , Tao Bo , Teng Chun Hong
Published: February 2012

One variety of durum wheat (Triticum durum L.), ‘Longfu 30’, was choosen to study the allelopathic effects of seed germination extracts on other plants. The allelopathic effects of different polarity extracts were measured in terms of germination rate and germination speed on a test cucumber variety ‘Jinyou No.2’ (Cucumis sativus L.), and the allelopathic substance in chloroform extract was preliminarily separated with HSCCC and determined by GC-MS. The results showed that the allelopathy of wheat seed germination extracts varied with the polarity of solvent, and the substance in chloroform phase was the most active and showed a significantly inhibitory effect on seed germination of cucumber by 80.7% under Petri dish culture. The major allelopathic substance in wheat seed germination extracts were phenol, amine, piperazine, alcohols, esters and ketones.
Comprehensive Evaluation of Wind Turbine Type Selection Based on GA-SVR Model
Authors: Sun Wei , Shen Le
Published: February 2012

Aiming at the current situation of wind turbine type selection in China, this paper has built a more scientific and systematic index system for comprehensive evaluation of wind turbine type selection, and also applied the Support Vector Regression machine evaluation model with parameters optimized by Genetic Algorithm. Through automatic global optimization for parameters, this model has reached an extremely high accuracy required for evaluation of type selection. Empirical analysis shows that the application of this model has a realistic popularized significance for improving the method of the wind turbine type selection and enhancing its efficiency.
Changes and Upgrading of Township Industrial District: the Comparison of Two Musical Instrument Manufacturing Industrial Districts
Authors: Zhu Hua You , Yue Li Ying
Published: February 2012

The musical instrument manufacturing industrial district is not only general but also unique for China's specialized industrial districts. This paper takes Yangzhou Chinese zither (Chinese musical instruments) industrial district and Xiqiao violin (Western musical instruments) industrial district as two typical examples to do a comparison, deliberating on the directions and paths of the transformation and upgrading of these two industrial districts from two perspectives, that is, the similarities and differences between their characteristics of changes.
Application of Water Immersion Ultrasonic Phased Array Technology in Wheel Rim Inspection
Authors: Jiang Qiu Yue , Gao Xiao Rong , Peng Chao Yong , Li Jin Long
Published: February 2012

Rim is an important part of the wheels. It is often over loaded and has a complicated stress in use. Specially, at high speed circumstances, the quality of the work piece is closely connected. This paper combines the water immersion technology with the ultrasonic phased array technology to wheel detection. It introduces the basic principle, current situation at home and abroad of the water immersion ultrasonic phased array technology, and the comparison with the contacted ultrasonic phased array detection technology. According to the feature of the rim flaws, the methods to detect rim flaws with water immersion ultrasonic phased array technology are analyzed and tested. This system can finish the whole scanning in one time, improve the work efficiency and satisfy the testing requirements.
Design of the Recognition and Decoding System of PDF417 Barcode Based on LabVIEW
Authors: Song Qian , Liu Li , Wang Yuan , Bao Ya Ping
Published: February 2012

The symbol structure of PDF417 barcode was introduced in detail, and a recognition and decoding system of PDF417 barcode based on software development platform of the LabVIEW virtual instrument was designed and implemented. The system can process and analyze the images containing PDF417 barcode collected by camera in real time, achieve the fast and omnibearing decoding of the barcode.
3D Detection and Reconstruction of Worn Parts for Flexible Remanufacture
Authors: Yin Zi Qiang , Zhang Guang Jun , Yuan Xin , Zhao Hui Hui , Wu Lin
Published: February 2012

In recent years, flexible remanufacture has become new research focus because of the requirement of rapid repair and reuse worn parts. 3D modeling of the worn parts is the precondition of flexible remanufacturing system. According to the random position and the various forms of worn parts, 3D detection and reconstruction are necessary. First, this paper establishes a 3D detection and reconstruction system based on linear laser. The mathematic model, work principle and composition of this system are introduced, and then, according to the analysis of this system, a two steps rapid calibration algorithm is proposed. When the system parameters are calibrated, it is able to acquire 3D information on surface of worn parts in the form of scattered point data clouds. Finally, take a coupler kunckles as the worn part, 3D detection and reconstruction verifying experiment is carried out.
Calcination Effects on Texture and Porosimetric Properties of Regular and Nano-Structured Alumina Utilized as Catalyst Support for the FT Synthesis
Authors: Hemmati Mahmoudi Mohammad Reza , Kazemeini Mohammad , Zarkesh Jamshid , Khorasheh Farhad
Published: February 2012

Samples of regular gamma and nano-structured alumina were prepared and their porosimetric properties evaluated by N2 porosimetry method. Moreover, cobalt based catalysts for Fischer-Tropsch (FT) Synthesis were prepared by loading cobalt under two calcinations using these alumina supports. Then the porosimetric properties of these materials as well as; their reactor behaviors assessed. Although the nano-structured favored the gamma alumina from pore volume and surface points of view, comparison of porosimetric properties of fresh alumina samples with corresponding catalysts prepared revealed that calcination effect in decreasing those factors was more pronounced for the nano-structured compared to gamma alumina. Also adsorption/desorption isotherms revealed that both materials were mesoporous. Catalytic activity assessment of both catalysts made by these supports showed that nano-structured alumina was more appropriate from activity and liquid hydrocarbon production points of view.
Detection Technology of Roll Attitude Based on Geomagnetic Signals and Inertial Trajectory Study
Authors: Cao Hong Song , Du Ye , Wang Jin Hu , Wang Quan
Published: February 2012

The intensity and direction of the geomagnetism vector is a function of geography position. The roll attitude of flying ammunition can be calculated by detecting geomagnetism. In the paper, the chief scheme and implement method of roll attitude detection system are suggested. The result of the geomagnetic detection unit can be used to resolve attitude by inertial trajectory. After experiments on 2-axis turntable are implemented, the results show that by the geomagnetic solution the angle error is of no cumulative characteristics, and the absolute error at different rotating speeds are controlled within 2 deg.
Design for Low Power Loss HART Transducer
Authors: He Lin , Jia Kun Ning , Fan Zun Qiang
Published: February 2012

Low power loss is the key of loop powered transducer design. The methods for reducing power loss are discussed in this paper. By selecting the appropriate device, and ultimately achieve the purpose of reducing energy loss. By the measured, the design fully meets the system requirements.
Design on Interferometric Sensor Demodulation System of OMAP-Based Asymmetrical 3x3 Coupler Output
Authors: Wang Feng , Wang Jin Hai , Wei Chun Hua
Published: February 2012

Based on the asymmetry characteristic of 33 coupler output signal, the improved demodulation arithmetic of 3x3 coupler was studied and deduced. To satisfy the requirement of fiber-optic sensor for real time, high accuracy and net work processing, a design method for embedded signal processing based on dual-core microprocessor OMAP is provided. The results of the experiments show that the system can meet the requirements of processing accuracy and real-time property and it has very high practical value.
A Neural Network Method for Miniature Unmanned Helicopter Heading Control
Authors: Bai Meng , Li Min Hua
Published: February 2012

A neural network control method for heading control of miniature unmanned helicopter is proposed. For the complexity of miniature helicopter aerodynamics, it is difficult to identify the unknown parameters of yaw dynamics model. To design heading controller of miniature helicopter without modelling yaw dynamics, BP neural network is designed as heading controller, which is trained by collected flight data. By training, the neural network controller can learn the artificial operation strategy and realize the heading control of miniature unmanned helicopter. Simulation results demonstrate the validity of the proposed neural network control method.
Study on Measurement Data Fusion of Mat Temperature Based on Weighted Least Square Algorithm
Authors: Yu Hai Ying , Hua Jun , Chen Xi
Published: February 2012

During hot pressing of the wood-based panels, the technological conditions, environment noises and performance of the sensors often result in errors in the temperature measurement. To improve the precision and reliability of data, multi-sensor technology is used for measurement data processing. The data consistency checking is performed by computing the confidence distance between adjacent sensors, and therefore the valid data fusion collection is determined. The weighted least square algorithm is applied to acquire high accuracy of overall estimation value by determining the information weight coefficient with the corresponding measurement variance of each sensor. The results of experiment demonstrate that the precision of overall estimation value is preferable than the partial estimation of each sensor and show the effectiveness and reliability of the algorithm.
Effect of Machining Parameters on Nano-Cutting of SiC Ceramics
Authors: Zhang Ke , Liu Guo Zhi , Gao Hai Yan , Sun Hong , Tang Yu Lan , Tang Yu Lan , Wu Yu Hou
Published: February 2012

SiC ceramics is very promising to be widely applied due to the excellent physical and chemical properties.However, the very difficult process of SiC ceramics hinders its application. In this paper, the nano-cutting of SiC ceramics is simulated based on molecular dynamics. The influences of the tool rake and cutting depth on the cutting force, the kinetic energy and potential are analyzed. The results show that the cutting force, system kinetic energy and potential energy increase firstly,reach the maximum, and then decrease in the process; with the increase of the tool rake, the cutting force and the kinetic energy decrease; with the increase of the cutting depth, the cutting force increases, and the kinetic energy and the potential energy decreases. These results are very helpful to understanding the process mechanism of SiC ceramics and increasing its process efficiency
Research on the Machining Behaviors in High Speed Milling Cellular Aluminium Alloy
Authors: Yang Fa Zhan , Zhuang Xin , Zhao Wan Hua , Yang Yong
Published: February 2012

The purpose of this investigation is to examine the machining behavior of cemented carbide tools in dry hard milling of cellular aluminium alloy (6N01) by experiments and finite-element analysis. From the machining point of view, Cellular aluminium alloy are often considered as poor machinability materials. Milling tests were carried out by using a three-head milling machine and a milling force measuring device. For this purpose, both microscopic and microstructural aspects of the tools were taken into consideration. Meanwhile, the cutting forces and the noise intensity are also considered in the experiment. Results show that cutting forces vary greatly with the experimental cutting parameters. Additionally, the noise field intensity increased greatly as the feed rate increased. Analysis indicated that the major tool wear mechanisms observed in the machining tests involve adhesive wear and abrasion wear.
Mechanism of Welding Test Pieces in Tensile Property Anomaly
Authors: Chen Yu , Chen Xing Hua , Wang Shuang
Published: February 2012

Aiming at the mechanical property abnormality of a certain cylinder test piece for aerospace application, scanning electron microscope and metallographic microscope were used to observe and analyze the fracture and weld structure of test pieces under tensile test, and the reason of property abnormality was determined. On the fracture of welding test pieces under tensile test formed two evident characteristic zones, one of which was the initial zone looking like arc ribbons alternating with each other. More obvious texture structure formed in the welding heat affected zone, with the direction consistent with that of the fracture in the up arc zonal fracture region. The reason of the abnormality was that relatively significant texture structure formed in the welding heat affected zone, while its formation was related to the temperature field and stress during the process of welding.
SH-CCT of High-Strain Pipeline Steel X80
Authors: Hu Mei Juan , Wang Peng , Lin Wei Ping , Wang Xiao Yan , Ji Ling Kang
Published: February 2012

Simulated heat affected zone continuous cooling transformation curve was measured by means of Gleeble 3500 thermal simulator. According to the results of microstructure observation and hardness measurement, influence of cooling rates on the microstructure and hardness in coarse grain zone of high-strain pipeline steel X80 was studied. The results illustrated that softening in coarse grain zone was ubiquitous problem for high-strain pipeline steel X80. There were mainly four types of phase transformation in coarse grain zone of high-strain pipeline steel X80. Polygonal ferrite(PF) and a small quantity of pearlite, granular bainite, bath bainite and bath martensite were obtained after different cooling time.
Experimental Study on Limiting Temperatures of Circular Hollow Sections
Authors: Kwon In Kyu , Kim Heung Youl , Kim Hyung Jun
Published: February 2012

Fire resistance is required to sustain the structural stability when building elements are exposed to a severe fire condition. To evaluate the fire resistance of structural members such as columns and beams, fire engineers can apply either prescriptive methods or performance-based fire design. These two kinds of fire resistance evaluation methods have been developed independently and performance fire design consists mainly of an advanced and simple methods. The simple method stipulated in New Zealand and the U.K. use the limiting temperature. The values of the limiting temperatures of structural steel members were shown in the BS, SNZ, etc but the temperatures of individuals were not classified. In general steel columns were made of H-section but recently the hollow section is inclined to increase for its higher resistant of structural stabilities than any other sections. But the hollow section shows different pattern when it carry out the loads in the cold and is expected to show different behavior when it is exposed to fire. Therefore the limiting temperature of the hollow section is required for evaluation of fire resistance. The paper is to make the limiting temperature of the circular hollow section (CHS) with or without filling of concrete and variance of applied loads.
Research on the Interface Bonding Conditions of Bimetallic Rolls Manufactured by Liquid-Solid Bonding Method
Authors: Li Wan Ming , Jiang Zhou Hua , Yi Gao Song , Feng Hao , Geng Xin
Published: February 2012

Bimetallic rolls’ interfaces manufactured by liquid-solid bonding method have been studied in the manuscript. Effect of pretreatment method of roll core, pouring temperature and preheating temperature of core to the bonding of interfaces are analyzed. Line scanning to the element chromium is done with SEM, the effect of technology to the organize structure and element diffusion is researched; Shear stress experiment of interface is done to analyze the effect of technology to bond strength.
Research SMT Technology Parameter Optimize Based on NiPdAu PCB
Authors: Yu Jin Wei
Published: February 2012

In the era of lead-free solder joints, nickel palladium gold PCB for its superior reliability and economy, more and more favored by the market , because the coating is added to palladium , SMT technology parameters have to be changed , to get solder joints of high reliability , therefore, analyzed quality factors of affecting solder joint formation of SMT process , rationally designed experiment program , obtained relative experimental data , analysis of larger speciality signal noise ratios and means , obtained optimizing SMT technology parameter for new nickel palladium gold plating , according to optimize results, improving SMT technology parameter, successfully applied nickel palladium gold PCB to SMT process ,reduce cost, improve product quality, and achieved good economic benefit .
An Experimental Study on the Fire Resistance Performance and Spalling of 100MPa HSC Column Mixed with Fiber-Cocktail
Authors: Yeo In Hwan , Kim Heung Youl , Kim Hyung Jun , Kim Kyung Ok , Oh Chung Sup
Published: February 2012

As the fire-resistance performance of high-strength concrete has emerged as a social issue and Korean Ministry of Land, Transport & Maritime Affairs has announced the standard for the fire-resistance performance of the concrete, studies to improve its fire-resistance have been conducted actively. In this paper, the study to develop high-strength concrete mixed with fiber-cocktail, a hybrid of polypropylene fiber and steel fiber was conducted. The fire-resistance test of 100MPa high-strength concrete and the analysis of steel bar temperatures for finding the optimal cross-sectional condition showed that the larger the section size is, the lower the temperature of steel bars is. It was also shown that the concrete columns with section sizes of 600mm x 600mm and 800mm x 800mm secure fire-resistance performance and the former is the optimal section size in terms of economic efficiency. The analysis of steel bar temperatures of the column having section size of 600mm x 600mm showed that the polypropylene fiber to steel fiber ratio of 1.5 to 40 (㎏/㎥) is the optimal for the fiber cocktail.
Numerical Simulation of the Flow Field in Safety Valve
Authors: Ji Xiao Bin , Qi Xue Yi , Li Xiao Yan , Jin Wan Bin
Published: February 2012

By using the Reynolds stress turbulence model at big Reynolds number condition and computational fluid dynamics, the data simulating calculation was carried out to the safety valve inner flow field with different opening size and different valve structural parameters. The result were showed in visual graphics , and the study showed that the valve structural parameters impact on the flow field distribution , the cavitation creation and the flow noise greatly.
Market Risk Analysis to Hydropower Project Based on Monte Carlo Method - Case Study of Xiluodu Hydropower Station in Sichuan Province
Authors: Li Zi Yi , Wang Song Jiang
Published: February 2012

Hydropower project investment decisions facing the market risk mainly for electricity price volatility. In this thesis, we are using Monte Carlo method analyzes market risk of XiLuoDu hydropower project. Result shows the practicability and effectiveness of Monte Carlo method.
Revised Injection Mold Design and Flow Analysis Based on Pro/E
Authors: Huang Ying , Wang Ming Di , Li Jie , Chen Zheng
Published: February 2012

The selection of the mold parting surface, gating system, core-pulling mechanism, injection machine and computational problems of injection mold structure is described by analyzing the structural characteristics and requirements of the plastic thermos shell. In order to improve productivity and reduce production costs, Pro/E is applied to the design of injection molding mold. At the same time, Plastic Adviser is used in the liquidity analysis of shell .This method can reduce design time and production cycle.
A Smart Wiper System Based on Feedforward-Feedback Composite Controller
Authors: Ren Xian Zhong , Luo Mei Fu , Qiu Ya Nan
Published: February 2012

The velocity of the wiper arms is a key factor which can influence the clarity of the windshield and the comfort of the driver’s view. So how to control the velocity of the wiper arms is important. To solve the problem, a method is elaborated based on feedforward-feedback composite controller. It introduces the hardware and software design based on the feedforward-feedback algorithm, controlling the velocity of the wiper arms by adjusting the duty of PWM. The experimental results indicate that the smart wiper system is reliable, and has good accuracy and real-time performance.