bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigating the Mechanical Properties of 0.5% Copper and 0.5% Nickel Austempered Ductile Iron with Different Austempering Parameters
Authors: Abdullah Bulan , Alias Siti Khadijah , Jaffar Ahmed , Rahim Farisol Abd , Ramli Abdullah
Published: November 2011

The purpose of this research is to investigate the mechanical and corrosion characteristics of Ni-Cu alloyed Austempered Ductile Iron before and after austempering process. Specimens of ductile iron and 0.5% Cu-Ni ductile iron were produced through conventional CO2 sand casting method. The specimens were then austenitized at 9000C before austempered at 3500C at three different holding times which were 1 hour, 2 hours and 3 hours subsequently. The corrosion characteristics of newly developed material were obtained by means of polarization test and the mechanical testing involved tensile test (TS 138 EN1002-1), Rockwell hardness test and Charpy Impact test (ASTM E23). Density test as well as microstructure and SEM observations were also done to ductile iron and Cu-Ni alloyed ductile iron samples. All the testing was done to both as cast and austempered specimens. Addition of copper and Nickel was found to slightly increased the mechanical properties due to solid strengthening effect of Copper and Nickel. The results also indicated that austempering process at 1 hour gives the optimum mechanical properties in term of tensile strength and impact properties compared to other specimens. Increasing the austempering holding times to 2 hours and 3 hours, in contrast had resulted in decrement of the mechanical properties. There are however only slight improvement in hardness properties and no significant effect on density properties of the specimens.
Deep Cryogenic Treatment on Aluminum Silicon Carbide (Al-SiC) Composite
Authors: Rasool Mohideen S. , Aripin Mohd Shukri Mohd , Thamizhmanii S. , Hasan Sulaiman B. , Sathiaraj Dan
Published: November 2011

Deep cryogenic treatment produces a significant enhancement in the mechanical properties of metals. In this research paper, the mechanical properties of Aluminium Silicon composite were studied when they were subjected to deep cryogenic treatment. Samples were prepared from two different compositions of Aluminum silicon composites (Al 2024_5%SiC & 10%SiC). The samples were given controlled cryogenic treatment at -186oC. Treated samples were compared with un-treated samples for their compressive strength, hardness and metallurgical changes. The treated samples have shown an improved compressive strength. The improvement is supplemented by the hardness survey and micro-structural changes.
Steel Slag as Neutralization-Adsorption Material for Treatment of Acidic Zn2+ - Containing Wastewater
Authors: Yang Hui Fen , Ou Qi Feng , Zhou Feng
Published: November 2011

Chemical and mineral compositions, the surface morphology of steel slag were evaluated in this study. On this basis, treatment effect of acidic Zn2+-containing wastewater was investigated using the slag as a water treatment material, and then mechanism of removal Zn2+ was discussed. The results showed steel slag was a suitable material for treatment of acidic heavy mental wastewater. Under conditions of slag size fraction of -1.2+0.15mm, slag concentration of 30 g∙L-1, stirring speed of 150rpm for 30 min, removal rate of Zn2+ was 98.59%, Zn2+ concentration in wastewater was reduced from 100 mg/L to 1.41 mg/L, and pH value was increased from 2 to 6.4. Filtrate after treatment reached the first discharge standard in integrated wastewater discharge standard (GB8978-1996). Appearance of Zn (OH)2 diffraction peaks in XRD pattern showed that Zn (OH)2 had covered on steel slag surface, and Zn2+ removal included four main processes: production of OH- from hydration reaction of aSubscript textctive calcium silicate in steel slag, generation of Zn (OH)2 precipitation in wastewater, adsorption and settlement of Zn (OH)2 on surface of steel slag and removal of Zn (OH)2 from wastewater by filtration.
Engineering Research on ECOSUNIDE Technique for Nutrient Removal from Municipal Sewage
Authors: Li Yan , Zhang Yan Qiu
Published: November 2011

For engineering research, ECOSUNIDE technique was applied in a sewage treatment plant under low temperature and low carbon resource. The whole experimental system has being running steadily after reasonable adjustments of influent distribution, returned sludge ratio and DO. The effluent qualities meet the Class I-B Criteria Specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB18918-2002).Effluent BOD5 and NH3-N meet the Class I-A Criteria. The results indicates that the treatment capacity could fluctuate within a range of ±3000 m3/d with DO properly controlled. In aerobic sections, the best DO was 2-3 mg/L. The optimal sludge emission amount could be attained through settlement ratio and sludge concentration with the present emission amount of sludge of 680 m3/d. It might be the restrictive factor that BOD/TN was less than 3 on TN removal which could not steadily achieve the Class I-A Criteria.
Multisensor Tracking of a Maneuvering Target in Clutter with Proposed Parallel Updating Approach
Authors: Gao Song , Gao Min , Xiao Qin Kun
Published: November 2011

To solve the problem of measurement original uncertainty, we present a proposed parallel updating approach for tracking a maneuvering target in cluttered environment using multiple sensors. A parallel updating method is followed where the raw sensor measurements are passed to a central processor and fed directly to the target tracker. A past approach using parallel sensor processing has ignored certain data association probabilities. Simulation results show that compared with an existing IMMPDAF algorithm with parallel sensor approach, the IMMPDAF algorithm with proposed parallel updating approach solves the problem of measurements' origins and achieves significant improvement in the accuracy of track estimation.
Parameter Tuning for Sensorless Induction-Motor Drive Use Stator-Current-Based MRAS Estimator
Authors: Yang Li Yong , Shuo Liu
Published: November 2011

This paper proposes an analysis of the vector-controlled induction-motor (IM) drive with a novel modelreference adaptive system (MRAS)-type rotor speed estimator .In this scheme which stator-current-error-based MRAS is used instead of the rotor-ﬂux-error-based MRAS scheme,an stator-current-error-based MRAS is used for estimate the IM rotor speed ,and this is used as feedback signals for the indirect field oriented control technique (IFOC),which is a widely used control method for Induction Motor drive (IM). For improving the dynamic characteristic of the system, it is very improtant for vector control to proceed parameter tuning.Some experimental results based on TMS 320F2812 DSP are provided to verify the proposed system performance in a low speed at no-load and load conditions.
A FLC-PID Controller for Variable-Pitch System of Wind Power Generation
Authors: Li Shou Hao
Published: November 2011

A FLC-PID controller is designed to solve parameter time changing and nor-linear problems of variable-pitch syetem. The FLC-PID control metod can improve the derivation responses of system. Control simulation are carried out to indicates that it is superior to the traditional PID and FLC controller.
Study on MPPT Control of the Single-Stage Grid-Connected Photovoltaic System
Authors: Wang Yan , Tian Feng Lan
Published: November 2011

The fuzzy control can react to the environment change quickly and keep the photovoltaic system work on its maximum power point all the time. However, the limitation in the fuzzy control itself and the characteristic of self-optimization lead to serious concussion of the system around the maximum power point. Whereas the PID control method is effective in the elimination of concussion and is easy to be realized. To tackle the problem, the fuzzy parameter self-tuning PID control method is adopted in the paper to achieve the MPPT control of PV system. The method can effectively eliminate the concussion around the maximum power point and improve the stability of the system; and achieve grid-connected operation with a high power factor in combination with the harmonic elimination PWM control of inverter. Simulation results show that the scheme has merits of simple structure, high power factor and reliable operation, etc. and is worthwhile to be popularized.
A Method for Water Quality Remote Retrieva Based on Support Vector Regression with Parameters Optimized by Genetic Algorithm
Authors: He Tong Di , Li Jian Wei
Published: November 2011

In order to improve water quality retrievals of multi-spectral image accurately, this paper puts forward a method for water quality remote retrieva based on support vector regression with parameters optimized by genetic algorithm. The method uses SPOT-5A data and the water quality field data, chose four representative water quality parameters, support vector regression are trained and tested, the parameters of support vector regression are optimized by genetic algorithms. The result of experiment shows that the method has more accuracy than the routine method. It provides a new approach for remote sensing monitoring of environment.
A Study on the New Grid Integration Solutions of Offshore Wind Farms
Authors: Zhang Xin Yin , Wu Zai Jun , Hao Si Peng , Xu Ke
Published: November 2011

Offshore wind farm is developed in the ascendant currently. The reliable operation, power loss, investment cost and performance of wind farms were effect by the integration solutions of electrical interconnection system directly. Several new integration configurations based on VSC-HVDC were comparative analyzed. For the new HVDC topology applied the wind farm internal DC bus, the Variable Speed DC (VSDC) system that is suitable for those topologies was proposed. The structure of VSDC was discussed and maximum wind power tracking was simulated on the minimal system. It is clear that new integration configurations based on VSC-HVDC has good prospects.
Design of Solar-Wind Complementary Grid-Connected Power Generation Monitoring System for Teaching
Authors: Sun Rong Xia , Wang Jian Li , Huang Pan Pan , Kang Jian , Chen Xiao Feng , Tian Yi
Published: November 2011

With the development of new energy industry, the technicians in the area of solar-wind complementary grid-connected power generation are urgently needed. For this reason, the monitoring system of 10kW solar-wind complementary grid-connected power generation was designed. Hardware system includes field device, communication network and monitoring host. Software design includes operation monitoring, application analysis, video surveillance, information issuing. It realizes functions of supervise and control, equipment events and alarm, report forms and print, energy management and forecasting, remote monitoring and so on. This research can be used to demonstrate experimental teaching in high shool and train power enterprise technicians.
Variational Data Assimilation for Renewable Wind Energy Predictions: China Inner Mongolia Case Study
Authors: Wang Hai Feng , Yin Wen Jun , Zhang Meng , Dong Jin
Published: November 2011

Advanced data assimilation method is used for the short-term wind power forecasting based on a meso-scale model. Considerable forecast error reduction is concluded from a case study in China, where a better resolved high-resolution initial condition is introduced via assimilating various in-situ observations.
Environmental Impact of Waste Slurry in Pile Foundation Construction of High-Speed Railway Bridges and its Countermeasures
Authors: He Yu Long , Xiong Chun Mei
Published: November 2011

Slurry is a necessary material in high-speed railway pile foundation construction. A lot of waste slurry which is harmful to the eco-environment will be generated after the construction is finished. If the slurry isn’t disposed properly, it will cause serious pollutions to the environment. This paper analyses environmental impact of waste slurry through four aspects: surface water, crops, soil and wastewater treatment system etc. Finally, it gets the conclusion that there are four methods to reduce the environmental pollutions of waste slurry: the first one is using the environment-friendly slurry in pile foundation construction; the second one is raising the slurry use efficiency; the third one is decreasing the amount of slurry usage and the output of waste slurry; the last one is developing the more eco-friendly waste slurry treatment methods.
Edaphic Characterization, Water and Salt Translocation in Saline Marsh at Local Scale in Songnein Plain, Northeast China
Authors: Wang Yong Jie , Luo Jin Ming , Wang Wen Feng , Gao Zhong Yan , Pang Shi Liang
Published: November 2011

The degradation of saline marsh in Songnen plain was controlled by many factors. Based on in-situ observation and laboratory analysis, soil properties and matters translocation in Zhalong wetland at local scale as affected by freeze and thaw action was explored. Results show that within the study plot, 1500 m in distance, but varying only 80 cm in altitude, existed four types of soils i.e. Shallow-horizon Alkalic Halosols (SAH), Crust Alkalic Halosols (CAH) and Para-alkalic Dark-Aquic Cambosols (PDC) and Sodic Hapli-Orthic Gleyosols (SHG). High content total porosity with amounts to 62% in surface horizon in marsh would help to water conservation and wetland formation. In contrast, large rate of silt or clay in texture in alkali soil and meadow soil constrain the water content in topsoil, i.e. the saturated water content 0-30 cm horizon of meadow soil and alkali soil were merely 0.83 and 0.7 m3 m-3. Residues & roots in surface layer of SHG expand the period of freezing phase as long as 9 months comparing to 7 months in SAH, and maximum freezing fringe in the former was 24 cm deeper than the latter (178 cm versus 154 cm). Seasonal freeze and thaw action has obvious influence on water storage in topsoil in saline marsh, leading different of soil succession therein. Soil moisture content in the surface layer of marsh increased from 2.05 to 2.62 m3 m-3(over-saturated), but no obvious change in PDC and Alkali soils. In contrast, electrical conductivity of saturated paste in SAH and CAH increased from 6.5 to above 10 dS m-1. Therefore, it did not accord with the practical situation of Northeast China as that of strong evaporation was the only cause that caused saline marsh alkalinization. Protecting the vegetation or restoring surface coverage by plant in saline land in spring may help land dealkalization in high latitude arid & semiarid regions.
Ultrasound Frequency Impacts on the Removal of Indigenous Blue-Green Algae Taken from Lake Taihu
Authors: Qiu Ye Jing , Rong Fei , Yang Fei , Li Jiang Ping , Long Hai , Wu Wei
Published: November 2011

This paper studied the ultrasonic removal of indigenous blue-green algae taken from Lake Taihu. The results showed that higher ultrasound frequency benefited the removal of indigenous algae. But in consideration of complex condition of the natural lakes and reservoirs such as the lack of powerful electrical supply system, low sound frequency is more suitable. Because of slightly improvement in the algae removal rate constants among the low frequency range (20-100 kHz), 20 kHz is the best ultrasound frequency for indigenous algae removal. Moreover, little change in the microcystins concentration was found with sonication at 20 kHz, 2W for 60s, which was compared with the increased microcystins from 2.67 to 2.851 mg/L after sonication at 1000 kHz, 2W for 60s. the concentration of chlorophyll.
Experimental Study of Magnetism Dependence on the Grain Size in some Ferreous Magnetic Nanoparticles
Authors: Zhu Yu Hua
Published: November 2011

The influence of grain size on the magnetism in some ferreous magnetic nanoparticles was studied in experiment. It is found that the γ-Fe2O3 nanoparticles present the superparamagnetism. The coercivity and the remnant magnetization approach to zero. Moreover, the pure nanoparticles γ-Fe2O3 and Fe, under the normal temperature, the specific saturation magnetization decreases along with the grain size reduces. According to the basis magnetic domain structural theory, the grain size of the samples is all below the critical dimension ds.
Effect of Nano-Silica on Flexural Properties of Epoxy Resin
Authors: Liu Fang , Wang Zhen Qing , Liang Wen Yan , Qu Yong Wei
Published: November 2011

Based on Zwick/Roell,this paper had carried on flexural experiments of epoxy resin filled with nano-silica particles, obtaining related mechanical properties.Microstructures of nanocomposites were analyzed by scanning electron microscopy (SEM) in the meanwhile. The flexural experiments revealed that nano- silica particles strengthened epoxy resin very well, and flexural modulus of modified matrices rised due to rigid silica particles, compared with pure epoxy matrices. Flexural strengths of epoxies modified by silica nanoparticles improved significantly.
An Investigation toward the Nano-Crystallization of Fe55Cr18Mo7B16C4 Bulk Amorphous Alloy
Authors: Ahmadi S. , Shahverdi H.R. , Saremi S.S.
Published: November 2011

Nano- crystallization of Fe55Cr18Mo7B16C4 bulk amorphous alloy has been analyzed by X- ray diffraction, differential scanning calorimetric test, and TEM observations in this research. In practice, crystallization and growth mechanism were evaluated using DSC tests in four different heating rates (10, 20, 30, 40 K/min) and kinetic models. A two -step crystallization process was observed in the alloy in which α – Fe, Fe23B6, and Fe3C phases were crystallized in the structure after annealing process. In addition, activation energy for the first step of crystallization process (i.e. α – Fe phase) was measured to be 276 (kj/mol) and 290 (kj/mol) according to Kissinger and Ozawa models respectively. Avrami exponent calculated from DSC curves was 2 and a three -dimensional diffusion controlled mechanism with decreasing nucleation rate was observed in the alloy. Further, it is known from the TEM observations that crystalline α – Fe phase nucleated in structure of the alloy in an average size of 10 nm and completely mottled morphology.
Experimental Study of Failure Performances of 51306-Coated Bearings under Lubricant Interruption Condition
Authors: Lu Ling , Yang Yu Lin
Published: November 2011

Some terrible disasters of aircrafts were caused by inadequate lubrication or interruption of lubricant delivery of the gas turbine engine mainshaft bearings. This paper introduces the design of the test equipment, performs the experiments of failure performance for 51306 coated bearings to respond to oil interruption under the actual situation. The main failure performance of test coated bearings has been demonstrated to be the cage damage of the test coated bearing. The failure mechanism model of the damaged cage of test coated bearings under oil interruption condition is established for the failure analysis of damage cages. The failure mechanism of the damaged cages is revealed. The main reason for the damages of test coated bearing cages under lubricant interruption condition is that the perpendicular component force acted on the cage increases continually to go with the increase of the friction force between the balls and the cage due to inadequate lubrication until the cage is broken.
Primary Study on Overtopping Erosion of Non-Viscous Embankment and Assessment of Discharge through Breach
Authors: Yu Ming Hui , Liang Yan Jie
Published: November 2011

Combined with the flume experiments and 1D unsteady flow numerical model, the paper has investigated the overtopping breach process of the non-viscous embankment. The breach expansion and the variation process of water level above the breach gate have been studied by series of experiments. Considering the difficulty to monitor the discharge through the breach, 1D unsteady flow numerical model has been applied to simulate discharge variation process. It is found that the width of breach gate and water level above the breach gate are the two key factors which influence the discharge through the breach significantly. Discharge variation process through the breach gate is consistent with the flow rule of side weir. The calibrated flow coefficient is from 0.389 to 0.696. The investigation results can provide scientific basis for disaster prevention and evaluation of embankment burst.
A Novel Thermal Insulation, Sound Absorption and Decoration Material
Authors: Zhu H.B. , Wang P.M. , Wang C.S. , Yan G.T. , Cheng Y.S. , Wu L.M.
Published: November 2011

Both of noise and building energy efficiency are attached importance to in the world. A novel material is developed to control noise, save building energy and decorate for buildings. Porous absorber, cavity resonator resonance sound absorber, film resonance sound absorber, functional absorber and high sound absorber are utilized to improve the sound absorbability. Perlite, Ordinary Portland cement, silicon fume, re-dispersible emulsion powder or emulsion, air-entraining agent, superplasticizer, short fiber and mesh fabrics are used to prepare novel material. Organic silicone waterproof material is used to prevent it from destroying, assist for sound absorbability and decorate for surface. After designing wedge sound absorber by mould, forming cavity resonator resonance sound absorber by air-entraining agent, and controlling compression ratio, diameter of perlite grain and cement dosage, final performances of sound absorbability and heat preservation can meet requirements of ASTM C423-84A and GB/T 20473-2006 respectively.
Improvement of Surface Roughness of Al-Si Alloy Cast Strip by Vertical Melt Drag Process
Authors: Nishida Shinichi , Fukudome Kazuki , Furusawa H. , Motomura M. , Watari H.
Published: November 2011

Strip casting process is possible to shorten for producing strip. Strip is produced from molten metal continuously and directly by strip casting process. Melt drag process is one of the single roll strip casting process. Melt drag process is simpler than general twin roll strip casting process. One of defect of cast strip is surface conditions, for example surface roughness. Cast strip surface roughness is larger than hot rolled strip. Large strip surface roughness is negative effect for cold rolling after strip casting or hot rolling. The aim of this study is improvement of cast strip surface roughness by melt drag process. We suggested vertical melt drag process. And investigations were operated such us producing conditions of Al-Si alloy strip, surface roughness of cast strip and microstructures.
Research on the Mechanical Properties for Medical Stainless Steel
Authors: Wen Ming , Li Wei , Cao Xiao Ming
Published: November 2011

The stainless steel is more and more applications to the medical field; the most is the austenitic stainless steel. In this paper, 00Cr18Ni14Mo3 mechanical properties of austenitic stainless steel screw, compared to the solution of the former and the sample microstructure after solution treatment, energy spectrum and the torque angle reverse faults, compared to solution treatment found that mechanical properties of the samples after meet the standard can be applied to practice.
The Study on a New Type of Full-Voltage Starting Method of Asynchronous Motors
Authors: Li Xiao Ming , Wu Huan , Zhao Yun , Liu Shi Qi
Published: November 2011

For various problems in the procedure of high-power induction motor’s starting and disadvantages of traditional starting methods, this paper proposed a new type of full-voltage starting method of high-power induction motor—a full-voltage starting method with dynamic reactive power compensation, introduced its principle, studied the control strategy of full-voltage starting with dynamic var compensation emphatically, and established the simulation model for direct starting, soft starting and full-voltage starting with dynamic var compensation based on the Matlab/Simulink simulation software to do digital simulation and compared three methods. The simulation results indicated that the method proposed in this paper can make the high-power induction motor start fast and smoothly with both high-torque and low starting current, and it has a better starting performance than traditional starting methods and the advantage of not affecting power quality.
Predict Interactions between Protein Residues for Developing Antibody Therapeutics
Authors: Shu Wen Lung , Lee Chia Hsuan
Published: November 2011

Recently, protein-antibody therapeutics becomes a hot search topic. In this paper, all protein interaction data files are collected from INTERPARE. Protein sequence and its secondary structure both are used to build HMM mathematical model. We randomly take 80% data to train positive and negative HMM models and 20% data to test. The accuracy of this approach can reach to 79.80%. This model can further be used to predict protein function sites and predict if a protein interacts with other proteins.
Rough Sets Based Simplified Analysis of Energy Loss Indicators in Power Plant
Authors: Tian Song Feng , Wang Wei , Tian Yun Feng , Liu Shuang Bai
Published: November 2011

There are many kinds of energy loss indicators in power plant, and there are some relevance among the various indicators. So extraction of the key indicators plays an important role between in energy loss analysis of power plants and optimal management of thermal power plants. Based on the characteristics of these indicators, the idea of rough sets was applied to the energy loss analysis of thermal power plants, then we proposed a new algorithm -- use fuzzy C means algorithm (FCM) to discrete cluster the energy loss indicators of thermal power plant, and then analysis simplified the results with algorithm Johnson. Real experiments (Chaozhou 1,2 and Ningde 3,4 assembling units which of the same type in the SIS system under the THA working condition)’ results had proved high accuracy and valuable of the algorithm.
The Case Study for Diversity in Nuclear Plant Instrument and Control System
Authors: Fang Tao , Hu Jin Song , Lu Dao Gang , Liu Zhi Yin
Published: November 2011

This paper through describing the comparison between LingAo Phrase II ATWT and Tomari DAS (Diverse Actuation System) in some aspects which including function, structure, and so on. Through the comparison, the author finds the biggest difference between the systems is the manual analog devices are used in ATWT. And the author proves the full digital control system’s performance is used to defense the CCF (Common Cause Failure). Especially the Controller be detailed analyzed by FTA (Failure Tree Analysis) and unavailability, because of the controller’s important. At last the author proposes better solutions for coping with the requirement of the Defense in CCF.
The Multi-Humiture Monitoring System for General Storehouses
Authors: Zong Rong Fang , Tian Jing Ming , Fan Ji Shan
Published: November 2011

This paper discusses the design of the temperature and humidity monitoring system. It designs from software and hardware aspects in detail. The system included the three modules such as PC, FPGA and some peripheral circuit. Thereinto emphasis is laid on the introduction of hardware and software of communication interfaces of PC and FPGA. FPGA is core controller; PC is used to manage data acquisition and analysis. It introduces the data acquisition based on PXI bus and NI software LabVIEW. The system has the following advantages: its interface is friendly, its circuit is simple, its function is strong and its hardware system is integrated highly. The system realizes the monitoring the multi-humiture storehouses.
Transient Model of Short Circuit Fault on Subway Traction Power Supply System
Authors: Li Xia Qing
Published: November 2011

Accurate analysis and modeling of DC side short circuit transient is important for design of DC traction power supply system and assessment of the suitability of protection arrangement. In recent years, the overshoot and swing in short-circuit fault current profiles of subway traction power supply system can not be correct explained by the existing subway traction power supply system fault model. The second-order transient model on subway traction power supply system is presented by analyzing short-circuit fault current recorder, the commissioning test waveform and electrical parameters of subway train. Using this model, the simulation results are consistent with the fault recorder and the commissioning test current profiles. Also the origin of the overshoot and swing on the waveform is explained.
Experiment the Influence of Subsection on Leakage Reactance in Submersible Motor
Authors: Xu Yong Ming , Meng Da Wei , Tan Jin
Published: November 2011

Submersible motor is of lathy subsection structure of stator and rotor and the leakage reactance in subsection impact on motor performance. Three-dimensional finite element mathematic model of submersible motor magnetic isolated segment used to calculate leakage reactance corresponding to the leakage magnetic field in it is established in this paper. Simulation prototype is designed. The accuracy and feasibility of the method described here is directly verified by example comparison. This leakage reactance has bigger influence to performance parameter of the motor and must be taken into account in the design of submersible motor for the future.
Vibration Characteristic Analysis of Hoist Cage Excited by Steelwork Defects
Authors: Li Zhan Fang , Xiao Xing Ming , Ma Chi
Published: November 2011

Due to steelwork defects, there is undesired vibration of hoist cage in operation which will influence safety of hoist system. In this paper, 6 degrees of freedom vibration model of hoist cage excited by steelwork defects was established first. Then horizontal and vertical vibration characteristics under different defects as well as relationship between vibration amplitude and hoist load, defect size and hoisting velocity were analyzed through simulation. Finally, simulation model was verified by experiment.
Traffic Engineering for Provisioning Hose Model VPNs with Delay Requirements
Authors: Liu Yu Liang
Published: November 2011

Virtual Private Network (VPN) is a logic network established on top of a public packet switched network. Previous research works on VPN mainly focused on security issues, such as tunneling, encryption/decryption and authentication. To guarantee that customers’ QoS requirements specified by customers can be met, the network service provider needs to reserve enough network resources on the network, and allocate/manage them in an optimal way. Traffic engineering algorithms can be used by the network service provider to establish multiple VPNs in an optimal way, while meeting customers’ QoS requirements. Previous works on VPN traffic engineering focus on meeting bandwidth guarantees, however, for some network applications, such as VOIP and IPTV, meeting delay requirement is one of another vital issue. To our knowledge until now, issues about traffic engineering for establishing VPNs meeting both bandwidth and delay requirements have not been investigated. In this paper, we proposed a novel VPN traffic engineering algorithm for establishing hose model VPNs with delay requirements. According to experimental simulations conducted our algorithm achieved better performance compared to previous ones.
Attitude Control of Spacecraft Multibody System by Optimal Nonholonomic Motion Planning
Authors: Liu Yun Ping
Published: November 2011

The optimal nonholonomic motion planning for spacecraft multibody system is researched. The attitude motion equations of spacecraft multibody system take on nonholonomic constraint without outside force. The control of system can be converted to the nonholonomic motion planning problem for a driftless system. Based on modified-Newton method, the optimal control algorithm of controlling spacecraft to desired attitude is accepted by optimal control algorithm and Ritz approximation theory. Quaternion is used to describe the kinematics equation, which avoids the singularity and has the benefit of small calculation and high precision. At last, numerical simulations of spacecraft with two reaction fly wheels has proved of the approach to be effective.
Research on the Whole Process Cost Control Methods of the Chemical Piping Engineering
Authors: Jin Xia Jie , Lin Cai Xing
Published: November 2011

Piping engineering, which involves a plenty of materials and has a large-scale construction work quantity, is an important part of chemical engineering, and how to make a good cost control of it is very important for the success of chemical project. Based on the Cybernetics and Systems science, this paper has established a whole process covered cost control model and proposed the control system for the piping engineering, and the related control strategies have been also proposed on this basis. Finally, combined with some cases, this paper analyzed the application of the whole process covered cost control methods in the chemical piping engineering.
Development of the Full-Digital High Voltage Power Supply for Electronic Beam Welder
Authors: Fan Sheng Wen , Wang Ze Ting
Published: November 2011

A 60kV/6kW full-digital high voltage power supply for electronic beam welder (EBW) is designed. The power is composed of DSP, CPLD, IPM etc. It has realized the automatic adjustment of high voltage, over-voltage and over-current protection, and rapid recovery from high voltage self-discharge. The test proves that high voltage power supply has reached design goal and satisfied the actual requirements of welding technology.
Application of Improved RBAC in System Login Component Design
Authors: Cao Yi Bing , Hua Yi Xin , Zhang Jiang Shui , Liu Xiao Lin , Zhang Hui
Published: November 2011

With the development of computer technology, the importance attached to the security of computer application systems is increasing day by day. Access control, as an important security technology, has been applied in the operating system, the database management system, security management and network operating system etc. This paper adopt the system ideology of high cohesion and low coupling in software engineering, achieve the design of login component by improving RBAC model under .NET platform, the model increases mechanism of direct authorize the users and shield part of users’ authority based on authorize main role, enriches the old RBAC mode of controlling authority, avoids the illegal operation of users, make sure the security of the system. Meanwhile, the component is well designed, and can be easily used as login component in large systems.
A New Practical Fault Location Algorithm for Two-Terminal Transmission Lines
Authors: Ma Zhou , Li Xiao Ning , Zhang Xiao Ming
Published: November 2011

A new practical fault location algorithm using two-terminal electrical quantities is presented in this article, which takes into account the distributed parameter line model. The analytical expression of algorithm derives from Three-Phase decoupling. First, an analytical synchronization of the unsynchronized measurements is performed with use of the determined synchronization operator and the non-synchronizing angle is calculated with the two-terminal pre-fault electrical quantities. Then, the real-time transmission line parameters are calculated using two-terminal non-synchronized electrical quantities and the non-synchronizing angle. The algorithm overcomes the drawbacks of the traditional fault location algorithms, which does not exist the pseudo-root problem. Besides, it has the advantages of simple, practical, litter computation, no need to search and iterative and robustness. The algorithm has not influenced by fault types, the transition resistance and other factors. At last the developed fault location algorithm is tested using signals of ATP-EMTP versatile simulations of faults on a transmission line.
A Frequency-Domain Identification Algorithm for MIMO Fractional Order Systems with Time-Delay in State
Authors: Liao Zeng , Peng Cheng , Wang Yong
Published: November 2011

The system identification problem of Multi-Input Multi-Output fractional order systems with Time-Delay is studied. A Frequency-Domain identification algorithm is presented, which combines genetic algorithm and subspace method for fractional order systems with time-delay in state. The genetic algorithm is used to identify fractional differential order and Time-Delay parameter. And the state space model is obtained by using frequency-domain subspace method when fractional differential order and time-delay parameter are fixed. Numerical simulation results validate the proposed algorithm.
Neural Network with High-Dimension Multi-Input Layers Based on Production Control and its Application
Authors: Li Jin Ling
Published: November 2011

A new neural network with High-Dimension-Input Multi-Input layers based on production control is proposed; its construction figure and algorithm are given as well in this paper. Because the new neural network can be seen as the result of moving some input dot of BP neural network to its hide layers, it is of few weigh value. In addition as the position of input dots in new neural network may be chosen according to production flow, as long as the chose is suitable, it can obtain a better effect than BP neural network. This paper uses the new neural network to the modeling of hot steel rolling production quality and compares the result with that of BP neural network. The fact shows that as number of weight values is decreased, the new neural network is of fast leaning rate and simultaneously can get a better result than BP neural network.
Controller Design for Spinning Missile with the Actuator Limit
Authors: Liu Fang , Chen Wan Chun
Published: November 2011

A nonlinear two time-scale dynamic inversion controller is designed. Actuator saturation in the spinning missile will limit the control commands responses. And the periodic motion and the physical limits of the actuator’s angle and angular velocity would make the respondent pseudo fin deflection angles much different from the desired dynamics. So a kind of command shaping method which limits the fin deflection angle commands in the pseudo body coordinates before the actuator’s limiter is proposed. Meanwhile, a feedback compensation method is applied to eliminate the cross coupling between the pitch and yaw channels in the actuator due to the spinning of the missile. Finally the performance of the controller with the command shaping and decoupling treatment is analyzed.
Web Application for Virtual-Making of Cost Domain in Process of Civil-Project E-Management by Suggestive Algorithms
Authors: Haghighi Amir Reza Estakhrian , Safaee Sina
Published: November 2011

In this article, it is tried to study the role of IT powerful tools to change in identity of procedure in developmental project management from traditional space to virtual space (conversion of project traditional management to project electronic project) and also it is studied how to enforce electronic methods in managing projects and it’s effect on expense/time and quality factors with modeling a developmental project as a pilot project to exiting systems and procedures in projects. Since in accordance to PMBOK [6] viewpoint, project management process can be defined as management on multiple domains such as Communication, Provisions, Cost, Quality and time. Therefore, in this article, some suggestive algorithms will be introduced to show the feasibility of virtual making and web-based management of one of the domains of project management. (Cost domain)
Parametric Optimization of TIG Welding on 316L Austenitic Stainless Steel by Grey-Based Taguchi Method
Authors: Korra Nanda Naik , Balasubramanian K.R.
Published: November 2011

Gas Tungsten Arc Welding (GTAW) is one of the most widely used welding process in industry. The input parameters play a very significant role in determining the quality of a welded joint (geometry of weld bead). The joint quality can be evaluated by studying the features of weld bead geometry (output parameters) such as Bead Width (BW), Bead Height (BH) and Depth of Penetration (DP). Present study focused on welding of austenitic stainless steel sheets using GTAW process with 316L material. The output variables are determined according to gas flow rate, travel speed and current. Grey relational analysis is applied to optimize the input parameters simultaneously considering the multiple output variables. Finally, confirmation experiment has been conducted to validate the optimized parameters and found to be correlated.
A High-Performance Signal Processing System for Monopulse Tracking Radar
Authors: Hong Yong Bin , Xu Cheng Fa , Gao Mei Guo , Zhao Li Zhi
Published: November 2011

A radar signal processing system characterizing high instantaneous dynamic range and low system latency is designed based on a specifically developed signal processing platform. Instantaneous dynamic range loss is a critical problem when digital signal processing is performed on fixed-point FPGAs. In this paper, the problem is well resolved by increasing the wordlength according to signal-to-noise ratio (SNR) gain of the algorithms through the data path. The distinctive software structure featuring parallel pipelined processing and “data flow drive” reduces the system latency to one coherent processing interval (CPI), which significantly improves the maximum tracking angular velocity of the monopulse tracking radar. Additionally, some important electronic counter-countermeasures (ECCM) are incorporated into this signal processing system.
Noise Reduction Using Wavelet Transform in Ultrasonic Flaw Detection of Small-Diameter Steel Pipe with Thick Wall
Authors: Wang Shao Jiang , Hou Li , Wang Yu Lin , Zhang Jian Quan
Published: November 2011

In order to ensure that small diameter steel pipes with thick wall have high intensity and high quality, ultrasonic immersion method with focusing probe was used to detect the flaw of the small-diameter steel pipes with thick wall. In practice, the echoes are often corrupted with external noise or internal noise, therefore, it is necessary to reduce the noise and to enhance the SNR of ultrasonic signals. A technique for improving the SNR of ultrasonic signals using wavelet transform is presented. In this method, WT, consider as one band-pass filter, is used to remove the noises. The performance of this technique has been verified by experimental, which is done by using a series of flaw ultrasonic echoes obtained from a specimen of the small-diameter steel pipes with thick wall. In particular we have found the processing of the ultrasonic signals using wavelet transform extremely useful for noise reduction. After processing, the SNR of ultrasonic signals are enhanced substantially. All experimental results show that this technique is effective for removing the white noise from the ultrasonic signals.
Analysis and Research on Optimization of Multi-Threading Load Balance under Multi-Core Architecture Based on OpenMP
Authors: Zhao Hui , Yuan Quan Bo , Qu Feng Juan , Wang Hui Juan
Published: November 2011

This paper presents OpenMP thread scheduling strategies by studying OpenMP load balance. In addition to analyze the defects of OpenMP load balance, an optimization program is proposed, and the ideas and methods of this program are described in this paper.
Numerical Simulation of Low-Current Vacuum Arc Plasma
Authors: Sun Peng , Yan Rong Ni
Published: November 2011

Three-dimensional magnetohydrodynamic(MHD) model of vacuum arc was built based on two-fluid model of ion and electron and Maxwell equation. In the MHD model mass conservation equation, momentum conservation equations, energy conservation equations of ion and electron, electric potential equations and magnetic equations were considered. With the aid of Computational Fluid Dynamics(CFD) software FLUENT and Re-development by visual C++, the important plasma parameters of low current vacuum arc , such as axial current density , ion temperature, electron temperature, mach number, were analyzed. The simulation results shown that the distribution of plasma parameters is consistent with that of the 2D axis-symmetric model.
The Research of Data Acquisition System about Flow Test in down Hole
Authors: Feng Ding , Xu Guan Jun , Zhou Yuan Hua , Zhang Hong , Chang Xiao Fei , Liu Li
Published: November 2011

The metering and controlling of down hole flow has became an important and indispensable technology in the development of oil field as well as the intelligent oilfield technology, the correlative data which measured by them can provide a reliable theoretical basis for the production and management of the oil-field. Develops a new flow measurement device which can adapt to the complex down hole environment is very important. This paper emphasis on the composition of the data acquisition system about flow test in the down hole, including the design of data acquisition system, the application of bus, the selected of core chip and the design of software, and super-induce some collecting data that get in the test, determining the most value information, as well as making a more rapid response to the oil deposit management, gets up a significant guiding sense to the heavy oil development and the intelligent well completion.
Wet Gas Flow Metering Based on Differential Pressure and BSS Techniques
Authors: Xu Peng Xia , Geng Yan Feng
Published: November 2011

Wet gas flow is a typical two-phase flow with low liquid fractions. As differential pressure signal contains rich information of flow parameters in two-phase flow metering, a new method is proposed for wet gas flow metering based on differential pressure (DP) and blind source separation (BSS) techniques. DP signals are from a couple of slotted orifices and the BSS method is based on time-frequency analysis. A good relationship between the liquid flow rate and the characteristic quantity of the separated signal is established, and a differential pressure correlation for slotted orifice is applied to calculate the gas flow rate. The calculation results are good with 90% relative errors less than ±10%. The results also show that BSS is an effective method to extract liquid flow rate from DP signals of wet gas flow, and to analysis different interactions among the total DP readings.
Research on the Electronic Strain Piezo Gauge Based on the Shell
Authors: Li Xin E , Zu Jing
Published: November 2011

Utilizing the characteristics of the special instrument of testing the chamber pressure—the electronic Piezo Gauge. Taking the electronic Piezo Gauge’s yend cover as the elastic sensitive component. a novel strain electronic Piezo Gauge is developed. In this paper, Theoretical analysis has been made about mechanical characteristics of the electronic Piezo Gauge shell. The simulation of stress, strain distribution and model of the elastic sensitive components has been conducted through finite elements software ANSYS. Meanwhile test experiments were carried out, and the experiment result prove that the electronic strain Piezo Gauge has good linearity and stability.
Experimental Investigation on Air-Solid Two-Phase Mixture Discharge under AC Voltage
Authors: Yao Wen Jun , He Zheng Hao , Deng He Ming
Published: November 2011

Multi-phase mixture (MPM) discharge has the common characteristics of randomness with air but more complex. How about the statistical rule of MPM discharge This is not only a fundamental problem for discharge research, but it has its own strong applied and practical characteristics. The air-solid two-phase mixtures(ASTPM) are employed to study and carry out some experiments for investigating the development and breakdown of MPM discharge under AC voltage. The results from experimental data show that the AC breakdown voltage and corona-inception voltage will drop when the solid particles are added to the discharge chamber with different permittivity and volume fraction. And there is no influence in gas flow and the corona current.