bluuebunny/crossref_metadata_2025 huggingface dataset:
Calculation of Fundamental Mechanical Properties of Single Walled Carbon Nanotube Using Non-Local Elasticity
Authors: Saxena Kuldeep Kumar , Srivastava Vivek , Sharma Kamal
Published: November 2011

The non-local formulation of elasticity has been introduced as a correction to the local theory in order to account for long ranged inter-atomic forces. This elasticity theory is useful to estimate the in-plane stiffness of Single Wall Carbon Nanotube. The non- local effect is present in Single Wall Carbon Nanotube through the introduction of a non-local nanoscale which depends of the material and a molecular internal characteristics length. This non-local nanoscale goes to zero at macro scale and hence the non-local effect vanishes with reference to classical mechanics. The resulting from the non-local elasticity theory is verified through molecular simulations results. For this study of non-local theory in analysis of Carbon Nanotube, the value of scale coefficient is about 0.7nm.
Numerical Simulation of Multi-Pass Welding Distortion in Membrane Water-Wall
Authors: Zhang Xian , Tu Sheng Li , Tao Guo Xing , Zhao Zhang Feng
Published: November 2011

This work deals with the welding simulation by the Finite Element Method (FEM). For the tube plate welding structure features of Membrane water-wall, the numerical computation method is applied to do the real-time simulation research on the temperature field and stress field during the welding process. The implemented models include a moving heat source, temperature dependence of thermo-physical properties, elasto-plasticity, non-steady state heat transfer, and mechanical analysis. The thermal problem is assumed to be uncoupled from the mechanical one, so the thermal analysis is performed separately and previously to the mechanical analysis at each time step. The mechanical problem is based on the thermal history. A special treatment is performed on mechanical elements during the liquid/solid and solid/liquid phase changes to account for stress states. The established simulation analysis method of welding temperature and stress field can provide theory foundation and direction for optimizing the welding structure design and standardizing the welding parameter.
The Effect of Protective Coatings on the Oxidation Behavior of 6061Al/SiC Composite at High Temperatures
Authors: Udayashankar N.K. , Rajasekaran S. , Nayak Jagannath
Published: November 2011

This paper analyses the effect of protective coatings on the oxidation behavior of 6061Al/SiC composite material at temperatures ranging from 500 to 800 K. Aluminum and AlCrN coatings are employed as protective coatings in order to improve the oxidation resistance of the composite. SEM, EDAX, XRD and oxidation measurement techniques are used to study the oxidation behavior and to characterize the composite specimens. Oxidation of the composite material without protective coatings is seen to be very rapid during the initial stages of exposure to the high temperatures but subsequently slowed down due to the formation of a protective surface layer of oxide. The oxidation was especially severe above 600 K. The interface between the matrix and reinforcement particles and the grain boundary regions of intermetallic precipitates in the matrix enhance this oxidation process since they provided sites for oxidation initiation. Aluminum coating on the composite obtained by DC magnetron sputtering technique and AlCrN coating obtained by low voltage electron beam evaporation technique reduce the oxidation rate effectively since the interface regions between the matrix and reinforcement, grain boundary regions of the matrix are unexposed to the atmosphere. Aluminum coating provides better oxidation resistance for 6061 Al/SiC composites.
A Numerical Study on the Characteristics of How Heat and Cooling Transfer on the Leading Edge of a Film-Cooling Blade
Authors: Li Shao Hua , Du Li Mei , Dong Wen Hua , Zhang Ling
Published: November 2011

In this paper, a numerical simulation was performed to investigate heat transferring characteristics on the leading edge of a blade with three rows of holes of film-cooling using Realizable k- model. Three rows of holes were located on the suction side leading edge stagnation line and the pressure surface. The difference of the cooling efficiency and the heat transfer of the three rows of holes on the suction side and pressure side were analyzed; the heat transfer and film cooling effectiveness distribution in the region of leading edge are expounded under different momentum rations.The results show that under the same condition, the cooling effectiveness on the pressure side is more obvious than the suction side, but the heat transfer is better on the suction side than the pressure side. The stronger momentum rations are more effective cooling than the heat transfer system.
Removal of Neutral Red from Aqueous Solution by Pretreated Penicillium Sp
Authors: Zhang Li Fang , Wang Min
Published: November 2011

The biosorption of neutral red, from aqueous solutions by Penicilium sp. biomass was studied in a batch system with respect to pretreatment methods, contact time, pH, initial dye concentration and temperature. The NaHCO3- treated biomass exhibited maximum dye uptake at pH 5-6. A larger amount of dye was removed by the pretreated biomass in the first 10 min of contact time and the equilibrium was established in 60 min for 50 mg/L of initial dye concentration. The optimum biosorption temperature was determined as 40 °C. Biosorption played main role in dye removal from aqueous solution in this study. The results indicate that the pretreated Penicilium sp. biomass can be used as an effective biosorbent to remove neutral red from aqueous solution.
Design and Construction of a Yeast Gene Bayesian Regulatory Network
Authors: Zhou Mei Chen , Zhu Fei
Published: November 2011

At present, biological data provide possibility to further data analysis data, improving deep understanding on complicated regulatory model. Thanks to the study of model organism yeast and the construction of its gene regulatory network, we can improve the diagnosis and treatment level of the human polygene hereditary diseases which are similar to yeast genes. Among a variety of gene regulatory network models, the one constructed by Bayesian Network corresponds to Biology's reality most. So we choose Bayesian Network to construct yeast gene regulatory network, of which process involves Bayesian Network structure learning and parameter learning. We gather and integrate the yeast data, by which we determine the network nodes. We learn the structure using MMHC algorithm, and use the simulated annealing algorithm to rating search so that we can get the best solution. Finally we use Bayesian algorithm or MLE algorithm to learn and determine the parameter. With the help of this regulatory network, researchers are able to have more acquaintance with the complex regulatory relationships in the gene regulatory network.
Experimental Study of Biological H2S Removal in Biogas
Authors: Fan Xiao Lin , Li Zi Fu , Wang Ting Ting , Jin Xin , Yin Fu Bin
Published: November 2011

Removal of hydrogen sulfide from waste and energy-rich gases is required not only because of environmental health and safety reasons, but also because of operational reasons. Biotrickling filter is one of the most promising clean technologies for removing H2S. This study attempted to remove H2S in biogas using a laboratory-scale biotrickling filter. The performance and the influence caused by different concentrations of pH, CODCr, sulfate, external nitrate source in the nutrient solution were systematically analyzed. Optimal operating conditions were obtained by the following: pH 2.0~8.0, COD 400~500mg/L, cumulative sulfate concentration 250mg/L, external nitrogen concentration 7.5mg /L.
Utilization Biomass from Bagasse Ash for Phillipsite Zeolite Synthesis
Authors: Patcharin Worathanakul , Sriamporn Kittipalarak , Kanokkan Anusarn
Published: November 2011

Bagasse ash is one of the agricultural wastes and valuable biomass by-products in sugar milling. It was treated hydrothermally with hydrochloric aqueous solution at 100 °C and burned at 600°C for 2 hours under oxygen feeding. The obtained white ash was further used as natural silica source instead of silica sol because of highly silica content from an abundant supply of sugar industries in Thailand. Aluminosilicate precursor gel was prepared from alumina source and silica source via sodium silicate preparation. Different crystallization time was studied for the molar ratio of SiO2/Al2O3 = 2 at 100°C crystallization temperature. The phillipsite zeolite synthesized was characterized using various techniques; X-ray diffraction, Scanning electron microscopy, Fourier Transform Infrared Spectroscopy, and BET-N2 adsorption method. The results can be used as value added for bagasse ash utilization, minimize the environmental impact of disposal problems and further application for heavy metal removal.
A Critical Analysis on Efficacy of Clinical Decision Support Systems in Health Care Domain
Authors: Raza Perwez Mohammad , Ahmad Naveed , Sajid Javaid Muhammad , ul Haq Muhammad Ehsan
Published: November 2011

Clinical Practice guidelines strongly relies on evidence based medical literature. In Health care domain decision support systems are playing a competent role in diagnosis and treatment from multiple diseases. Among different Hospitals all over the world the Information technology domain emphasis key roles in improvement of patient health care to great extent. The Concept of Data Mining (DM) and Decision Support systems (DSS) in medical domain provides an efficient mechanism to extract the multiple records of patient treatment diagnostics from previously stored records in Data base (DB) or Data Ware House (DWH) and compare these guidelines to perform strong analysis that results in efficient decision making. Along the previously mentioned techniques the era of Telemedicine has also being developed that results in generation of multiple techniques in diagnosis of multiple diseases and health improvement using Mobile Health care systems specially worth full for the rural areas where latest medical facilities are unavailable at the point of need. The required information in Database or in Data Ware House might be the historical data of patient or the health based summery of different patients in diverse stages. Now these days the emergence of distributed decision support systems in health care domain covers the health care treatment procedures in more comprehensive manner including surgical procedures and radiological treatment. In this paper we are going to analyze the multiple health care diagnosis procedures and treatment techniques using various decision support systems designed and implemented by various researchers all over the world and compare the effectiveness and efficiency of each decision support system in health care domain. Our research study is also helpful for physicians and health care practioners in analyzing multiple scenarios related to interesting pattern recognitions and intelligent decision making.
Visual Evaluation of Cast Dental Alloys Welds Discontinuities in the Field of Fixed Prosthodontics
Authors: Porojan Sorin , Sandu Liliana , Topală Florin
Published: November 2011

It is essential for a weld to satisfy the requirements of certain standards in the field where it is applied. The aim of the study was to highlight the discontinuities which can appear in the joints achieved by laser and microplasma welding of base metal dental alloys used in fixed prosthodontics. All types of discontinuities which are visible from visual inspection were searched: inclusions, inadequate joint penetration, incomplete fusion, undercuts, overlaps, underfills. Recognizing the defects and discontinuities and their delimitation was essential in determining the weld quality. The obtained results were satisfactory for the purpose both for microplasma and laser welding. Using these methods, welds without defects, which meet minimum acceptable standards for each case, could be obtained.
Fabrication and Characterization of Injectable Biomaterials for Biomedical Applications
Authors: Champa Jayasuriya A. , Mauch Kristalyn J. , Ebraheim Nabil A.
Published: November 2011

The aim of this study is to evaluate the injectable cross-linked chitosan (CS) microparticles (MPs) to apply for biomedical applications specifically for bone regeneration. The CS MPs were fabricated by emulsification method and formed the cross-links between the amide groups in the CS and phosphate groups in the sodium tripolyphosphate (TPP) ionic cross-linking agent. The MPS were analyzed for morphology by Scanning Electron Microscope (SEM). The fabricated CS MPs were in the spherical shape with the size range of 20-100 m. These CS MPs were analyzed for biodegradation by immersing in phosphate buffered saline (PBS, pH = 7.4) at 37°C for 30 weeks. The biodegradation of CS MPs in PBS was initiated at week 25. Mesenchymal stem cells (MSCs) were harvested from the bone marrow of mice tibia and femurs. The MSC attachment on CS MPs was tested using LIVE/DEAD cell sassy with a Fluorescence Microscope. The murine MSCs attachment onto CS MPs at day 2 was confirmed by visualizing fluorescence images. The CS MPs were also analyzed for the injectability and retainability at the site using a subcutaneous injection in a rat model. The fabricated CS MPs possess injectability, biodegradability and biocompatibility. Therefore, these CS MPs have a great potential to apply for various biomedical applications including bone regeneration by injection.
The Design of the Supervisory System Based on the SOPC
Authors: Zhang Ming
Published: November 2011

System on a programmable chip is designed for the development of embedded system．By embedding a micro_ processor in FPGA．SOPC not only takes the advantage of micro-processor system which is rich in software and hardware resource．it also is a part of FPGA system which has fast logic．So SOPC is considered to be the direction of the future in embedded filed. Meanwhile．This thesis has interpreted the application of SOPC in the monitoring system, and tries to find the advantage and features of the SOPC system by practical designs.
Power-Fail Detection and Data Storage Design for Control System
Authors: Wang Liu Min , Mo Bo
Published: November 2011

The purpose of power-fail protection design is to ensure the certainty and integrity of system information. The key point of design includes: the signals of power-fail detection and data treatm- ent; real-time clock circuit design which is synchronous with the system or as a mark of time; using non-volatile memory (such as FRAM) or using battery backup to maintain trade volatile memory (eg RAM) power to ensure the information integrity and non-volatile storage when the power is removed.
Modeling of Fuel Supply for Ethanol-Gasoline Engine Based on Fuzzy PID Control
Authors: Feng Wei Bin , Wang Xi Hui , Liang Rong Guang
Published: November 2011

It is complex to simulate the system with continue controlled object and discrete controller, in order to avoid the complexity, a new method to describe the continue controlled object of internal combustion engine with discrete model was given, which is based on the principle of the total energy of an isolated system is constant and the theory of heat transfer in the cylinder, for the internal combustion engine has the special cycle of operation. In the paper, an example of ethanol-gasoline internal combustion engine was given to prove the modeling way is feasible. The digital fuzzy PID controller is design and the simulation results show that the controller is workable. The discrete model will be used in digital controller design and simulation for the fuel supplying control.
Research on Design Key Technologies for High-Power Submersible Motor
Authors: Xu Yong Ming , Meng Da Wei , Tan Jin
Published: November 2011

The effect of stator and rotor subsection’s characteristic to the motor design and the performance established on the basis of the structure characteristic of submersible motor has been researched in this paper. The leakage reactance which is caused by the magnetic isolated segment has been calculated by solving the three-dimensional magnetic field, the ingenuity design of rotor sheet displays a skew slot role. Some methods such as Simpson’s algorithm, layered algorithm has been used in the calculation of part of the submersible motor, so the design method has been improved. An imitation experiment model machine has been designed and manufactured on the basis of this. This method was proved to be right and practicable by comparison of design result with experiment data.
Cooperative Area Coverage Reconnaissance Method for Multi-UAV System
Authors: Long Guo Qing , Zhu Xiao Ping
Published: November 2011

Aiming to find a solution, the method of cooperative area coverage reconnaissance for Multi-UAV system is proposed by combining centralized preplanning with distributed partial online replanning. In the preplanning, grid disintegration is applied to divide the area to be reconnoitered into task sequence of nodes and fuzzy C-means clustering algorithm is applied to conduct space distribution of task nodes; the online partial replanning is that the left UAVs automatically complete the unfinished task of the failed UAV, using the membership matrix got by clustering algorithm as a unified standard, which ensures that so long as one UAV does not fail, the reconnaissance task can be normally carried on. The simulation results show that this method, simple yet with a high robustness, can effectively solve the problem of multi-UAV cooperative area coverage reconnaissance.
A Research on Ultrasonic Range Finder Based on Encoding Technology
Authors: Qiu Ying , Gao An Li
Published: November 2011

The mechanism of ultrasonic ranging has the advantages of being simple in structure, low cost, high measurement speed, and free from the environmental constrain, such as severe whether. It has been widely adopted even through there are still some shortcomings in the measurement range, such as the measurement interval limitation, wave beam over wide , poor resolution in direction, and unexpected reflection phenomenon in mirror[1-3].The main principle of ultrasonic ranging is to measure transit time that ultrasonic emits through launched probe, more specific, is the total travel time of the ultrasonic wave from the probe passing the target, reflected by the target , and then coming back to the received probe in the same route. The distance between sensor and the target is calculated by the half value of the arithmetic product between the transit time and the speed of propagation of the ultrasonic wave in the medium. The measurement for the transit time includes: Pulse-echo method, Phase difference method, and Frequency difference method [4-6]. Among the methods, the accuracy of the Pulse-echo method is always related to the size of the echo signal amplitude, which is influenced easily by environmental elements. However, it has the advantages of simple measurement circuit, easy implementation, and low cost, which leads to its wide application. Considering the problems of cross interference and aliasing effect, as well as the occasional false triggering phenomenon in the occasions of multiple ultrasonic ranging, this study designed a special ultrasonic ranging finder to avoid them by employing the technology of codec. The experimental conclusion shows that it can be reliably applied to the occasions that multiple ultrasonic range finders are adopted used at the same time.
The Control Strategy Of V2G Participating in Peak Regulation in Power System
Authors: Tian Wen Qi , He Jing Han , Jiang Jiu Chun , Du Cheng Gang
Published: November 2011

With the increase of new energy power generation, the requirement of smart grid and the popularity of electric vehicles, the research focus on V2G. With Electric vehicles being distributed energy storage or distributed generation, peak regulation in power system is involved in important functions of V2G. In order to achieve peak regulation function, the paper has analyzed the control relationship between the electric vehicles, V2G station and electric vehicle charge\ discharge control center, presented charge and discharge control strategy based on the two levels of electric vehicle charge\discharging control center and V2G station control layer and introduced algorithms and examples to achieve these strategies.
Research on Fuzzy Control System of the Water Level for Steam Generator
Authors: Zhang Yong Sheng , Ma Yun Yi
Published: November 2011

In order to improve the control quality of the water level for steam generator, a fuzzy level controller for steam generator is designed based on the fuzzy logic principle. The fuzzy logic toolbox and Simulink module of Matlab software are used for the modeling of the water level control system of steam generator. The operating condition of reducing load is calculated. Simulation result shows that the fuzzy control has such virtues as smaller overshoot, shorter regulating time and stronger robustness than the conventional three-element PID control. Fuzzy control is especially effective for nonlinear system like steam generator with multivariable, large time lagged and strong coupling. It is a very effective control method with widely application prospect.
SINS Installation Error Calibration Based on Multi-Position Combinations
Authors: Wang Zhen Huan , Chen Xi Jun , Zeng Qing Shuang
Published: November 2011

A new method is proposed to calibrate the installation errors of SINS. According to the method, the installation errors of the gyro and accelerometer can be calibrated simultaneously, which not depend on latitude, gravity, scale factor and earth's rotation rate. By the multi-position combinations, the installation errors of the gyro and accelerometer are modulated into the sine and cosine functions, which can be identified respectively based on the least squares. In order to verify the correctness of the theoretical analysis, the SINS is experimented by a three-axis turntable, and the installation errors of the gyro and accelerometer are identified respectively according to the proposed method. After the compensation of the installation error, the accuracy of the SINS is improved significantly.
Investigation of G4-73 Centrifugal Fan Airfoil Stall Characteristics
Authors: Wang Song Ling , Liu Zhe , Zhang Lei
Published: November 2011

It’s of great significance for safe and reliable operation of fan to research on the stall characteristics of the airfoil. The 2D non-compressible Reynolds-Averaged Navier-Stokes equations was built to simulate the flow around the airfoil of G4-73No.8D centrifugal fan, a detailed numerical simulation under different angles has been carried out which based on the Realizable turbulence model with Fluent. The numerical results show that the smaller of the flow rate, the bigger incidence angle is, when the incidence angle is bigger than the critical incidence angle, the suction side stall appears. According simulation the airfoil stall appears when the incidence angle is -28°, with the increasing of the negative incidence angle, the separation point gradually moves to the leading edge. There is a strong vortex which locates at suction side =0.5,the alternating stress on the blade which caused by vortex will make the blade fatigue. If the incidence angle is less than -20°,there is no flow separation, therefore, to ensure the safe operation of the fan, the incidence angle should be less than -20°.
Hand Flat Knitting Machine Speech Counter System Design - Based on Single-Chip Microcomputer
Authors: Kang Li
Published: November 2011

This paper designed a set of counter system to hand flat knitting machine based on single-chip microcomputer, for the inconvenient of counter of traditional ones. It used a shading photoelectric switch sensor converted the output of the sensor into standard electrical signal of single-chip microcomputer with converter, then dealed with single-chip microcomputer, and the count value was output by speech at the end . The hardware simulation results show that the design is practical, achieving the schemed requirements.
The Leak Detection System of Air-Conditioning Pipeline Based on LabVIEW
Authors: Wang Ya Ping , Zhu Mu Cheng , Tang Lin , Liu Shi Jie
Published: November 2011

Air conditioning refrigerant leakage is often in the course of one fault occurs, the event of leakage, in a very short period of time cooling system will be unable to function properly. In order to realize the reign of air pipelines leak detection, this article is brought forth new ideas that pipe leak detection of air conditioning is achieved by the stress wave technology and by programming in the development environment of LabVIEW. Experimental results show that this new method is quick, accurate and reliable to detect and to locate the leak source occurred, the system measures the absolute positioning error is less than 0.3% and the relative error is better than 1.5%.
Overview of the Low Voltage Ride-Through Technology for Direct-Drive Permanent Magnetic Wind Power System
Authors: Huo Xin Zhang , Xiao Xiang Ning
Published: November 2011

In recent years, the proportion of the wind power in the grid is increasing rapidly. In addition, the penetration of wind power in grid has been rising. It will lead adverse effect to grid, if the wind turbine off-grid during the fault of network. Wind power technology-leading countries have issued the quantitative standards of fault through which requires on-line operation .In this paper, the influence of wind turbines off-grid on the grid and turbines during the fault of grid is analyzed firstly. Meanwhile, the control objective of the low voltage ride through (LVRT) is proposed. Several types of LVRT technology for the Permanent Magnetic wind Power System are summarized and evaluated respectively. Finally, the developing direction of this technology is drawn from the above discussion.
Automatic Control System for the Process Parameters of the Soakage Agent in Glass Fiber Production
Authors: Zhu Mu Cheng , Nie Shi Liang , Wang Ya Ping , Jiang Yong , Guo Jiong
Published: November 2011

Soakage agent in glass fiber production is critically, the stability of its quality is directly related to the stability of the glass fiber quality. According to the characteristics of the soakage glass in fiber agent production process, this paper is mainly introduced the multi-sensor information collection for the soakage agent process parameters, and is proposed to use PLC programming, PID control and fuzzy control harmony methods to achieve the real-time automatic control preparation process of the soakage agent in adding water of amount, adding oil of amount, temperature control, liquid level control, viscosity test and many other parameters . The practical application of the automatic control system is reliable, accurate, real time.
Study on Reliability Analysis of Distributed Control System of Nuclear Power Plant
Authors: Wang Hu , Li Shao Hua , Qi Guang Cai , Lai Fu Sheng
Published: November 2011

The reliability of the nuclear power plant DCS is analyzed using Markov process to establish a mathematical model. And the initial use of the model on the three indicators of reliability parameters of nuclear power plants is calculated. The results showed that the model is correct,reliable and error rate is 9×10-10.DCS applies to preliminary analysis of the reliability of nuclear power DCS. Nuclear power plant DCS reliability is high enough, the minimum time of continuous operation is up to 66667 h, compared to conventional control methods more safe and reliable.
Construct an INLP Mathematical Model to Solve the Two-Sided Assembly Line Balancing Problem of Type-3
Authors: Lan Chun Hsiung , Ma Su Yee
Published: November 2011

This study discusses construct an Integer Nonlinear Programming (INLP) mathematical model is presented to solve the Two-Sided assembly line balancing problem (TALB) of Type-3. The mathematical models proposed in this paper are constructed by the syntax of Lingo, and the built-in “global solver” is selected as the solving method to conduct the searching of global optimum solutions. Therefore, the Type-3 of TALB for optimal distribution by the mathematical models proposed in this study to be solved. This study creates a highly repeated characteristic because of the adoption of Lingo packaged software. Finally, the tests are carried out on a well-known benchmark set of problem, and experimental results demonstrate that the proposed model is efficient.
Scheduling the CAN Bus with Rate Monotonic Techniques
Authors: Chen Zai Ping , Guo Yan Lei
Published: November 2011

Controller Area Network (CAN) is widely used in real-time automobile control and is gaining wider acceptance as a standard for factory automation. This paper discusses the applicability of Rate Monotonic (RM) techniques to the scheduling of CAN messages. Rate Monotonic can guarantee higher network utilization, but it is difficult to implement in periodic data networks or local buses. The paper mainly analyzes the RM scheduling algorithm and then establishes the simulation model about the algorithm based on CAN bus, and analyzes the effect in this situation of experiment.
An Intelligent Monitoring System for Agriculture Based on Zigbee Wireless Sensor Networks
Authors: Lin Yuan Guai
Published: November 2011

For meeting the needs of the survey of agriculture environment communication in Hainan Province, an intelligent monitoring system was developed based on ZigBee which consists of four parts: wireless sensor networks, gateway, transmission network, remote monitoring center. A new type network structure which is composed of wireless sensor networks and the transmission network was proposed. This paper is devoted to explanation and illustration for our design of intelligent agricultural monitoring system. The system feasibility and superiority was verified in a simple star topology setup in a botanical garden in QiongZhou University. The sensor nodes can obtain the temperature, humidity and illumination information in real time, and then transferred to the remote monitoring center by the gateway via the transmission network. The test result shows that this intelligent agriculture monitoring system has the useful characteristics of low power consumption, low cost, large network capacity, flexible disposition, and minor influence on the natural environment. It has better actual application value.
A Nonlinear Compensation Approach for the Iron-Core Coils Based Electronic Current Transformers
Authors: Xie Yue , Shen Li Qing , Chen Jing
Published: November 2011

Iron-Core coils based electronic current transformer is often used with electrical measuring instrumnts and meters. However, the iron-core coils used as the primary current sensor have nonlinear behavior, and its magnetizing current can be considered as the main error source. Therefore, a nonlinear compensation approach for the iron-core coils based electronic current transformers is proposed in this paper. The approach depends on a linear hardware circuit and a nonlinear numeric control law. Theoretical analysis and experimental results have verified the correctness of the proposed method.
Control Limitations on Static Unstable Airframe Using Two-Loop Acceleration Autopilot
Authors: Wang Jiang , Lin De Fu , Fan Jun Fang
Published: November 2011

An analysis for controlling a static-unstable tactical missile using two-loop acceleration autopilot was detailed. The rate feedback loop was firstly presented. The equivalent actuator dynamics was introduced and examined. Thus an overall stabilization condition combined with both low and high frequency cases was proposed. The lever effect led by inertial measurement unit was of benefit to a great controllable range. The results show that the autopilot control capacity is dominated by actuator bandwidth, and a compromise should be determined between the flight performance and the actuator requirement for a static unstable tactical missile.
Distributed Control System of Line Reactive Power Optimization for Rural Power Network Based on Improved TS Algorithm
Authors: Xu Tong Yu , Zhou Yun Cheng , Tan Dong Ming , Piao Zai Lin
Published: November 2011

An improved TS algorithm is put forward on the condition that reactive power compensation location and capacity have been identified in rural distribution lines. The Algorithm is based on capacitor optimal on-off model aimed at a minimum network loss, it can control the capacitor on-off according to the load changing and the system operation status and keep real-time voltage qualified and network loss minimum. A distributed control system is designed by using the algorithm to realize reactive power optimization, which is composed of reactive power optimal terminals and background control center. The terminal is in charge of data collection and transmission, on-off instruction receiving and executing. The control center in in charge of receiving data from every compensation point, calling control algorithm to process data, forming and sending instructions. GPRS technology is adopted to realize the system’s foreground-background communication. The actual application in some experimental networks has proved that the system can realize global optimal control for distribution lines, and is suitable to be widely used in rural distribution network.
An Optimal Design Method Based on Feature Technology for Micro Device
Authors: Liu Zheng , Chen Hua
Published: November 2011

A method for generating fabricating information of micro device from a feature-based design model is presented. With cooperative design mode, the process model derivation and optimization are accomplished simultaneously. This work provides designer a more intuitive way to design product by means of process verification to improve manufacturability. The key enabling technologies are introduced briefly.
An Ultra-Wideband Antenna for Mobile Handset Applications
Authors: Zong Wei Hua , Qu Xiao Yun , Guo Yong Xin , Shao Ming Xin
Published: November 2011

A printed open-ended slot antenna is designed for mobile phone application. The slot has a hybrid structure of a rectangle and a circle cut out of a 60mm×115mm ground plane, and fed by a microstrip line with a circular patch connected to a bent strip on the upper part of the patch. The proposed antenna provides a wide -6dB bandwidth covering 1.73-11GHz. It can be used in DCS1800, PCS1900, UMTS2000, TD-SCDMA, Bluetooth, LTE2.5GHz, WiMax, and UWB
Research on Numerical Simulation of Gas Storage Field in Aquifer Based on Fully Implicit Method
Authors: Wang Bao Hui , Yan Xiang Zhen , Yang Xiu Juan
Published: November 2011

The mathematical model of Two-Phase flow of water and gas in aquifer is established based on the Darcy linear percolation law and law of conservation of mass of fluid mechanics. According to the fully implicit difference method, time and spatial discretization of the model lead to a set of nonlinear equations, which can be transferred into a group of linear equations. The linear equations can be solved using the Jacobi-iteration pretreatment because of its high stability and fast convergence speed of the solution positively. The distribution of the saturation and formation pressure with time in the process of gas injection is analyzed by using the mathematical model. The results show that the gas saturation increases with the gas injection rate, the permeability and reservoir thickness increasing whereas the formation pressure increases slowly under same cumulative gas injection rate. The formation pressure increases at first and then decreases to reach a steady value.
Electrical Energy Saving Based on Production Process Optimization for Steel Enterprise
Authors: Zhu Hai Nan , Shi Jia Chuan , Liang Li Ping
Published: November 2011

The iron and steel industry annually consumes about 10% of electricity in China, while the utilization efficiency is relatively low. A two-step energy-saving method for steel enterprise is proposed in this paper. The production plan is regulated to minimize the energy utilized in steel rolling. The electrical load is forecasted according to the optimized steel-rolling plan and the reactive power is compensated to minimize the active power loss and voltage fluctuation. Practical application in Jigang Group Co., Ltd shows the efficiency of the proposed method.
Processing Load Signal on Wheel Loader Transmission
Authors: Sun Li , Liu Yong Chen
Published: November 2011

To determine fatigue life of Loader transmission and to analyze machine power for different user, the torque loads of wheel loader transmission are tested and calibrated with the method of four sections per cycle. The disturbed signals are filtered by low-passed filter, and anomalous spikes are eliminated with the NSOFT. And contrastively analyzes the disposal effect of signal, then acquires pure random load-time course. It concludes that one Hz of the low-pass filter frequency is suitable, and the test signal is in line with the actual work of Loader. These provide the base for getting load spectrum and virtual test on wheel loader transmission.
The Development of Monitoring System in Breeding Center Based on Wireless Sensor Net
Authors: Yang Peng , Liu Song , Yang Ming Hui
Published: November 2011

The article realize the application in breeding center based on the technique of ZigBee and wireless sensor net. The monitoring system can track and monitor the environmental factors and production process which influence the growth of seedling in real-time and continuously. The article introduces the structure and composition of system, the design of software and hardware. The monitoring system is simple, stable in practical application process, which has a very important significance on the management to breeding center.
Progresses on Production Techniques of Gas Hydrate Slurry
Authors: Chen Wei Jun , Liu Ni , Li Ju
Published: November 2011

Because of a great many of advantages with gas hydrate slurry, it can be widely used in air-conditioning system as a candidate of conventional secondary refrigerants. In this paper, three methods of producing gas hydrate slurry expressed as continuous stirring, water spraying and gas bubbling are introduced and the characteristics are discussed. The progresses of hydrate slurry at home and abroad is also presented briefly.
The Application of the Niching Genetic Algorithm to Optimum Design of the YKK Series Induction Motor
Authors: Hu Zhi Qiang , Hu Guan Yu , Zong Ji Dong
Published: November 2011

In order to get the YKK series motors to the ultimate purpose of achieving energy-efficient, and to meet the various request constraints set forth in the in the actual production, the paper introduces the niche genetic algorithm to the optimization of the motor design. For the forming structure of medium-sized high-voltage stator coils and the actual situation of three round relative fixed size, this article makes a corresponding improvements to the niche genetic algorithm, the proposed approach surmounts effectively the local convergence problem of standard genetic algorithm. The experimental results demonstrate that: compared with the initial program, the ultimate design results of the electrical motors meet the technical specifications of the proposed efficiency motor. Furthermore, the size of motor has been reduced, which saves the effective materials of the motor. It prove the feasibility and advantages of niche genetic algorithm’ improvement, and more important is, it verify the practical engineering value.
Study on the Repair Methods Responding to Disturbance during Production Scheduling
Authors: Zhou Ya Qin , Yang Peng , Li Bei Zhi , Yang Jian Guo
Published: November 2011

Most of the literature on scheduling problem only focuses on how to obtain the optimal schedule in static environment. However, when the schedule is carried out in job shop, it always meets with varied disturbances. These disturbances will make the schedule’s performance different from the pre-obtained schedule, and make the original schedule invalid. In this paper, the varied disturbances which always appear during the performance of schedule are studied. The repair methods responding to these disturbances are analyzed which are classified into three typical kinds. Using these three kinds of repair methods, the usual disturbances during scheduling can be repaired. And a right shift rescheduling method is proposed to reschedule the initial schedule.
Mature Using and Innovation of Economic Management in Material Flow
Authors: Xiong Fu Rong
Published: November 2011

Innovation of economic management is the basic in the developing of material flow, we state the importance for material flow developing, and introduce the management of electronic commerce and it’s innovation, analyze the future developing and innovative concept for material flow, and supply the basic for strong developing of material flow. Along with great development of Chinese economy level and increase of the standard of peoples’ living, the volume of trade at home and abroad is constantly increasing, and the growth of trade items will provide good opportunity of development and wide space for domestic material flow market. The smooth operation of logistics mode needs management the theory support from economic management. With the feedback of practice, people further develop the innovation of logistics management theory, use the improving and perfecting of theories to form a powerful theory system so that we can repeatedly use it to guide practice and make our logistics mode tend to being perfect step by step from a wide level. The synchronous improvement of peoples’ living standard has provided good opportunity of development for the logistics enterprises and also provided convenience and tangible benefits for peoples’ life, which lay the foundation for another improvement of Chinese peoples’ life and the construction of harmonious society.
Fundamental Necessities of Knowledge Management in Project Based Firms
Authors: Mortazavi Seyed Mohammad
Published: November 2011

This study seeks a model for Knowledge Management in project based firms. The work process in these firms is getting on a contract with a client over a project which is to be delivered in a certain period of time and with a certain amount of budget. Depending on the type and specification of the project, the firm achieves or creates some knowledge which is almost tacit. The concern here is that this tacit knowledge is lost by the end of the project, whether due to time limitations and rush for delivering the project which makes it impossible for the firm to turn this knowledge into explicit; or it goes away with the workers since they are generally project-loyal not company-loyal. Based on the literature this study reveals that KM can act as powerful instrument for increasing project-based firms’ performance and hence raise their chances for absorbing more projects. However this is a two-sided fact; clients have more faith in those firms with loaded with high-level experiences while the chances are higher for satisfying clients in those firms which manage their knowledge gained from earlier projects.
Failure Prevention on Application of Flexible Printed Circuits
Authors: Liu Ping , Gu Xiao Long , Liu Xiao Gang , Zhao Xin Bing
Published: November 2011

With the compact nature and the high electrical-connection density, flexible printed circuits (FPC) can achieve considerable weight, space and cost savings over the use of traditional rigid printed circuit boards. In recent years, it becomes impossible without flexible printed circuit technology in electronic products especially for Flip mobile phones. Whereas, its application is not always satisfied the engineering of assembly and reliability due to the existing of mechanical stress in soldering process and service environment. In this paper, through analyzing the common failures in mass production including via interconnection, trace crack and black pad, some preventions were suggested to improve the quality and reliability at the aspect of manufacture, process, mechanical design and dynamic stress distribution philosophy.
The Impact of Using Data Warehouse on Manpower Employment Decision Support System
Authors: Alasta Amro F. , Enaba Muftah A.
Published: November 2011

Since the use of computers in business world, data collection has become one of the most important issues due to the available knowledge in the data; such data has been stored in database. Database system was developed which led to the evolvement of hierarchical and relational database followed by Standard Query Language (SQL). As data size increases, the need for more control and information retrieval increase. These increases lead to the development of data mining systems and data warehouses. This paper focuses on the use of data warehouse as a supporting tool in decision making. We to study the effectiveness of data warehouse techniques in the sense of time and flexibility in our case study (Manpower Employment). The study will conclude with a comparison of traditional relational database and the use of data warehouse. The fundamental role of data warehouse is to provide data for supporting decision-making process. Data in data warehouse environment is multidimensional data store. We can simply say that data warehouse is a process not a product, for assembling and managing data from various sources for the purpose of gaining a single detailed view of part or all an establishment. The data warehouse concept has changed the nature of decision support system, by adding new benefits for improving and expanding the scope, accuracy, and accessibility of data. The warehouse is the link between the application and raw data, which is scattered in separate database but now is unified. The objectives of this work are to study the impact of using data warehouse on Manpower Employment Decision Support System, in the sense as far as the data quality concern. We will focus on the benefits gained from using data warehouse, and why it is more powerful than the use of traditional databases in decision making. The case study will be the Libyan national manpower employment agency. The data warehouse will collect database scattered from different sources in Libya in order to compare the performance and time.
Investigations on Fume Formation Rate in Shielded Metal Arc Welding Process Using Different Electrodes
Authors: Hameed M. Shahul , Sivapirakasham S.P. , Balasubramanian K.R. , Nagalakshmi R.
Published: November 2011

Welding is one of the major processes used in the manufacturing industry. The base materials, welding consumable materials and physical and chemical phenomena, which are connected with high temperature and UV radiation, are emission source of welding fumes. The particulate solid dust and various gases are included in welding fumes. This paper addresses the experimental investigation made to study the process parameters on formation and composition of fumes during shielded Metal Arc welding (SMAW) of stainless steel. The process variables include electrode diameter and welding current. It was observed that, the welding current and electrode diameter have a positive effect on the fume formation that is, increase in welding current and electrode diameter caused an increase in the concentration. All the metallic constituents attached to it also exhibited the same behavior.
Corrosion Behaviour of Electron Beam Welded AISI 304 and AISI 4140
Authors: Arivazhagan N. , Narayanan S , Surendra Singh , Satya Prakash , Reddy G. M.
Published: November 2011

In the present work hot corrosion studies were carried out on electron beam welded AISI 304 and AISI 4140 dissimilar weldment in molten salt (K2SO4-60% NaCl) environment at 800 °C for 50 cycles. The weight gain follows parabolic law in all the cases. It is observed that the scale formation was maximum on 4140 side as compared on 304 side. Moreover higher content of Fe2O3 and Cr2O3 on scale over weld zone may be due to enrichment of this zone with Fe and Cr. This could be attributed to diffusion of chromium towards AISI 4140 from the AISI 304 and diffusion of iron from AISI 4140 side towards AISI 304. Furthermore weld interface suffered accelerated corrosion behavior in the chloride and sulfate mixed molten salt environment in the form of intense spalling and sputtering of its scale. The cracking of oxide scale on the weldment might be attributed to different composition of base metals, weld metal and oxide formed.