bluuebunny/crossref_metadata_2025 huggingface dataset:
Grey Relational Analysis to Assess Algebraic Reasoning Test of the Pictorial Pattern
Authors: Ma Hsiu Lan , Wu Der Bang , Jen Chin I , Cheng Yu Kuang
Published: August 2013

This study uses Grey relational analysis (GRA) to evaluate a portion of the algebraic reasoning that uses multiple-representation of pictorial patterns. Current results of this study not only identify the easiest and hardest questions for students, but also show how proposed GRA provides a novel approach to educational testing.
PHD Filter for Multitarget Tracking with Range Ambiguity
Authors: Tan Shun Cheng , Wang Guo Hong , Wang Na , Yu Hong Bo
Published: August 2013

It is difficult to track multitarget of which the number is unknown and time varying, especially with range ambiguity. The probability hypothesis density (PHD) filter propagates the first order moment of the posterior multitarget density, from which the number of targets as well as their individual states can be extracted. However, when tracking multiple targets via the middle or high pulse repetition frequency (PRF) radar, the problem of range ambiguity has to be solved. In this paper, a novel method for joint range ambiguity resolving and multitarget tracking is proposed. The feasibility and effectiveness of the proposed method are verified by simulation results.
Numerical Simulation of Conical Pick Cutting Coal and Rock Process Based on ABAQUS
Authors: Liu Chun Sheng , Song Yang , Ren Chun Ping
Published: August 2013

Aimed at investigating efficient cutting method with a lower energy consumption, higher reliability and life, and researching the intrinsic relationships between ability of picks' breaking coal rock and related factors, this paper simulates the dynamic process of conical pick cutting coal rock by using ABAQUS/explicit, analyzes cutting load statistics, and evaluates the similarity of simulation results and test results quantitatively using Pearson correlation coefficient. The results indicate that the simulation results are in good agreement with the test and the theoretical results (the error is within 10%), the description of the variation law and influence degree of the cutting force, propelling and lateral force along with the pick cone angle and installation angle, the average gradient of three force variation, the ratio range of propelling force to cutting force (0.18~0.34) and variation tendency along with the installation angle and the cone angle. Positive or negative alternating direction of lateral force proves that cutting slots on both sides of coal rock existing non-simultaneous avalanche phenomenon in cutting process. The study provides the reference for the simulation of pick cutting and cutting mechanism broking coal and rock under considering the anisotropy of coal rock and beddings and joints.
Influence of the Driver Style in the Inlet Parking Process on the Energy Consumption of the EV Bus
Authors: Yan Ying , Zhuang Ji Hui , Zhu Dao Wei
Published: August 2013

The relationship between the difference of the driver behavior and energy consumption in the same bus line was studied through analyzing the inlet parking process of the driving cycles in order to solve the problem that the practical benefits in endurance mileage of the electric buses differed a lot. It showed that the energy recycled in the inlet parking process differed 21% between the best driver and the worst one and the energy difference was influenced dramatically by the accuracy of vehicle speed prediction and the tendency of deceleration of drivers.1.
Recovering of Iron from Feebly-Magnetic Iron Tailings Containing High Silicate
Authors: Xie Xian , Wang Xiao , Tong Xiong
Published: August 2013

In this study, the main aims were to recovery iron from iron tailings containing high silicate and reduce the tailing grade by using combined separating technology. Experimental studies were carried out on the iron tailings in Dahongshan samples, which contain 27.78% of iron. Through the experiment, the first is pre-classification by high-frequency vibrating, and then the iron is recovered by strong magnetic separation of one rough, one scavenger and a gravity concentrating with Slon and chute. The iron concentrate which the grade of Fe is 53.08% and the recovery of 68.45% is obtained and the grade of tailings reduce from 27.78% to 13.80%. Iron tailings get a comprehensive utilization, which has a better effect.
Analysis the Vegetation and Soil Moisture in Beijing-Tianjin Area to Prevent Desertification by Long-Term Satellite Remote Sensing
Authors: Li Jun , Dai Feng Zhi , Li Yuan , Yu Chun Yu , Hirose Nozomu
Published: August 2013

The desertification to Chinas Beijing-Tianjin area is analyzed by using the state of vegetation, soil moisture and meteorological data that are collected by the satellites. The state of vegetation, soil moisture and long-term changes of temperature and precipitation in the selected study areas (that are near Beijing-Tianjin area) is analyzed and compared, from which the trend of desertification is predicted. Thus the effective long-term protection and control strategy can be set up.
Collapse Simulation of Bricklaying Arch Based on 3D Distinct Element
Authors: Ou Yi Hong , Qian Hai Bing , Wu Ying , Wang Dong , Du Yang , Jiang Xing Sheng
Published: August 2013

In order to numerical simulate the transition process from continua to discontinua and even to structural collapse,the collapse of bricklaying arch built by two-layer stone material is analyzed based on the deformable distinct element method (DEM).The simulation results are consistent with that of experiment. The research results shows that not only the load-displacement response of the arch under uniform fracture energy can be appropriately predicted through the method, but also the collapse behavior when the system partially or completely reaches failure can also be simulated
Flaws Simulation of Cave Depot in the Process of Explosion
Authors: Ou Yi Hong , Qian Hai Bing , Wang Dong , Wu Ying , Liang Jian Jun , Du Yang
Published: August 2013

This paper adopts the program Ansys and its secondary exploit platform tools to construct three-dimensional model to simulate the destroy process of cave depot. The method that damage surface and yield surface are dealt separately, and dispersion model is forward to simulate flaws. And the results of numerical simulation have been debated to find the laws of flaws growth and distribution with increasing of explosion pressure. It can be found that with the the linear increase of explosion pressure, flaws and distribution regions of flaws grow and expand. Tension flaws are precede to shear flaws. Flaws regions appear in the order , namely, the center of the arch--arch foot-- flaws in the center arch propagation - flaws in other else regions propagation. The research result has important value for online monitor, maintain and reinforce of cave depot. And the technology that has been forwarded in this paper also supplies for the numerical simulation researcher.
Design of Flare Gas Flow Measurement System on Offshore Oil Platform
Authors: Gao Qiang , Zhao Hong Ye
Published: August 2013

Aiming at the problems of flare gas flow monitoring on offshore oil platform, a flare gas flow measurement system is designed. This system is integrated in the whole flare control system and reaches the effective monitoring of flare gas flow. Besides it adopts ultrasonic flow-meters for the more accurate flow-meter data and adopts hot-cap method for the realization of being installed without halting production. Results indicate that the design could offshore oil platform improve the efficiency and safety of production in offshore oil platform.
Numerical Simulation and Structure Optimization on the Corrugated Tubes of a Double Pipe Heat Exchanger
Authors: Han Jian Huang , Liu Yang , Wang Zun Ce , Li Sen
Published: August 2013

The combination of numerical simulation and orthogonal experimental design method can reduce the test number. Structural parametric modeling research on corrugated tube of heat exchangers in our work to establish the fluid flow and heat transfer numerical simulation model. A scheme of orthogonal test of a corrugated tube, which includes 4 factors and 3 levels and has taken heat exchange quantity, resistance of the internal tube and annular gap as evaluation indexes, was designed. A method combining with the difference and the variance analysis was taken to analysis the result of orthogonal test, and the effect of different structure parameter on corrugated tube was achieved. Finally the optimal structure parameter of the corrugated tube was obtained by a comprehensive balance method, and those methods above-mentioned provide a reference for the design or promotion of the corrugated tube of tube heat exchanger.
Water Film Detection in Water Distribution Test of PCCS
Authors: Li Xiao Feng
Published: August 2013

In the passive containment cooling system (PCCS), water distribution tests are essential to verify the water distribution devices performance. Without regular boundaries and homogeneous intensities, images of water film acquired from these tests are hard to be detected by conventional approaches. We propose an improved segmentation method to identify the water film areas from the complex background. Considering the gray distortion resulted from asymmetric illumination, the method combines the modified motion segmentation and optimal threshold method. Detection results show that this method is hardly affected by the illumination change, and also insensitive to noise.
The Intelligent Synthesis Testing System for LB-703 Dint Arm
Authors: Zeng Xian Lin , Zhang Wei Dong , Zou Tao
Published: August 2013

At present, the trouble rate of the new crystal dint arm equipped on the new battle plane is very high, we can’t use the dint arm experiment equipments we have now to do function test to it, so we have designed the dint arm intelligence synthesis test system With Embed machinery control as its core, adoption unit wooden blocks type construction, programmed with VB, circulated in WINDOWS98. Those made the automatic apparatus have lots of advantages, such as high measure precision and autoimmunization, good reliability and universal, the machine can be expanded, the software can be enlarged and advanced, the man-machine interface is friendly, it can also be operated simply. By being tested, this machine is well-found, holding advanced techniques and predominant capabilities. It has important significance for improving the fine rate, duty rate and increase combat effectiveness.
Design of a Pan-Tilt System for Substation Inspection Robot
Authors: Xiao Peng , Wang Hai Peng , Luan Yi Qing , Li Li , Wang Tong Bin
Published: August 2013

The performance of pan-tilt system is very important to substation inspection robot when performing inspection tasks, but the existing products cannot fully meet the requirements in this application field. To solve this problem, a pan-tilt system designed for inspection robot is illustrated in this paper, and the hardware and software designing process are discussed briefly. In order to verify the control quality of this system, an experimental test has been carried out, and the pan-tilt system designed in this paper has enough ability to help inspection robot fulfill inspection tasks.
The Design and Implementation of the Expert System for Cutting Parameters Based on CLIPS
Authors: Liu Xue Bin , Wang Xi Bin , Li Chong Ning , Deng San Peng
Published: August 2013

Three core content of CLIPS expert system are researched on, namely rule base, fact base and inference engine. Using the production rules, in accordance with CLIPS syntax express the knowledge of cutting parameters, and according to the CLIPS syntax of the fact base, the rule base and the inference engine, knowledge bases of the cutting parameters expert system is built. In Visual C + + programming environment, combined with the CLIPS dynamic link library, by the interactive communication between Visual C + + and CLIPS, the software, cutting parameters expert system, has been developed successfully while has laid a good foundation for the selection of the cutting parameters to optimize.
The Application Study of Image Recognition Technology in Substation Sequential Control
Authors: Wang Zhen Li , Sun Yong , Wang Bin Hai
Published: August 2013

This paper proposes a method based on image recognition technology to identify the status of the isolation Switch and Breaker in Substation. It is based on Smart robot, and can replace operator to identify the status of the Switch or Breaker after switching operation. It crates conditions for one-key-sequence-control through the research of the SIFT algorithm, Hough algorithm and KNN algorithm. The application of the Lanxi substation proved that it has a high practical value.
Research on Parameters Optimization of Biodiesel Engine Combustion System
Authors: Xu Yin Sheng , Zhu Hua , Lu Ke Jiu
Published: August 2013

This paper researches on the optimization of the effective thermal efficiency of diesel engines for the target optimization on the test bench to investigate the economical efficiency impact of combustion system parameters of diesel engine fueled with biodiesel to determine the optimum value of these parameters in order to improve the burning biodiesel combustion efficiency of the diesel engine. Results show that the system parameters through the optimization of combustion can meet the standard of the diesel calibration power levels up to the original machine, combustion efficiency can be achieved for more than 32%.
Application of Auto-Control and Measurement System for Three Gorges Shiplocks Model
Authors: Yan Dong Hong
Published: August 2013

This paper mainly introduces the automatic control and measurement system of the TGP's double line five consecutive model. The water valve of locks must have multiple forms of open/close function, the control system uses microcomputer control multi-channel power stepping motor driven system, accomplish precise control according to the model test for the requirements of the valves open means .Measurement system, the real-time monitoring method, from all kinds of measuring sensor signals collection, for lock chamber filling drain hydraulic characteristic parameters and other parameters are automatically synchronized measurement. The test results show that the system is reliable, control and measurement accuracy satisfies the requirement of test.
Nonlinear Coordinated Control of STATCOM and Generator Excitation Based on Improved Dynamic Surface Control Method
Authors: Li Wen Lei , Lin Wei Xing
Published: August 2013

For the single machine connected to infinite bus power system with uncertainties, one nonlinear coordinated control scheme for Static Synchronous Compensator (STATCOM) and excitation is proposed in this paper. Firstly, in order to avoid solving the differential algebraic equations (DAEs) model of system, we simplify the DAEs into the classical differential equations, and then a new nonlinear parameter strict feedback model is given. Secondly, in order to make the system achieve the desired results, the controller is designed in two parts based on improved dynamic surface control method (IDSC) and passive control techniques. The theoretical analysis shows that the derived controller can not only attenuate the influences of external disturbances, but also has strong robustness for system parameters variety. The control law obtained is more effective and the system globally and uniformly ultimately bounded can be achieved using full nature of nonlinear dynamic. Lastly, the further simulation results indicate that the proposed controller can ensure transient stability of the power system under large sudden fault.
Analysis on Improved Dijkstra Algorithm in Intelligent Transportation System
Authors: Wang Hao Yu , Ji Chao Jun , Ji Xiao Juan
Published: August 2013

Intelligent transportation system (ITS) is a complicated system, and selecting the shortest path is the core of the system. In order to ease traffic congestion of the city, through solving the shortest path, the key technology in realizing the function of ITS, and based on the analysis of traditional Dijkstra algorithm, the paper puts forward the improved algorithm. The new algorithm includes two parts, that is, preprocessing and real-time pruning research, and the effect of pruning totally depends on the division of specific diagram.
Finite-Time Chaos Synchronization of Lorenz Chaotic System Based on the Passive Control Teachnique
Authors: Wei Yi Feng
Published: August 2013

Finite-time chaos synchronization of Lorenz chaotic system applying the passive control method is investigated in this paper. Based on the finite-time stability theory and the passive control technique, the passive controller are proposed to realize finite-time chaos synchronization of Lorenz chaotic system. The controller is simple and robust to noise. Both theoretical and numerical simulations show the effectiveness of the proposed method.
Research on the Improvement of OCT Used in Power System
Authors: He Hong Peng , Liu Jun
Published: August 2013

Smart grid puts forward higher requirements for measurement equipments, so optical current transducer (OCT) used in power system possess broad application prospects. In this paper, magnetism gathering technology is applied in the design of OCTs optical structure and the magnetism gathering optical structure based on solenoid coil is proposed. Compared with traditional bulk optical structure, this structure simplifies the optical structure significantly. Results of simulation and field operation indicate that this structure can not only enhance the magnetic field created by the measured current significantly, but also improve the long-term operation stability of OCT.
Extended Kalman Filtering and its Application to Intelligent Missile Formation Flight Mechanics
Authors: Zhang Xu , Cui Nai Gang , Wang Xiao Gang
Published: August 2013

Aimed at the needs of intelligent missile cooperative engagement mission, a relative navigation method based on INS/Vision is presented, and the relative inertial equation between leader missiles and attack ones is derived. The line of sight measurement is acquired by observing the beacons on the attack ones using the vision navigation equipment on the leader missiles. The extended Kalman filter is used to estimate the relative attitude, relative velocity and relative position by fusing the inertial navigation information and the line of sight measurement. Simulation results verify the effectiveness of the relative navigation method. Improve the estimated accuracy of missile in formation flight mechanics.
Fluid Structure Interaction Simulation on the Bionic Airfoil of the Small Unmanned Plane
Authors: Qiao Zeng Qiang , Yang Yong Bo
Published: August 2013

The quality and dependability of the small unmanned plane is more and more important currently. For the small unmanned plane under the conditions of Low-Reynolds, the air viscosity has relatively greater influence on its aerodynamic performance. This is one of the greatest difficulties to design a small unmanned plane. The aerodynamic performance of bionic aerofoil and NACA 4412 is contrastively analyzed while the Reynolds-Number is and by the Fluent. The computational result and the analysis show that the fluid-structure interaction is an important issue to consider while designing the small unmanned plane.
The Civil Airports Machinery and Equipment Innovative Design Preferred
Authors: Xue Zheng Yu , Yu Xiao Qing , Lin Mao , Wei Na
Published: August 2013

In order to give full play to the airport for civil aviation security performance of the machinery and equipment, improve military efficiency as the goal, the whole life cycle of the product, a set of evaluation criteria and the guidelines by using mathematical methods to quantify, the establishment of a mechanicalinnovative design program evaluation preferred method and model.
The Optimum Adaptive Cooperative Control of the Vehicle Steering and Anti-Lock Braking System
Authors: Li Guo , Liu Huan
Published: August 2013

In this paper, a new two-level cooperative control system is proposed for the vehicles steering antilock braking stability fields. The architecture is composed with the execution layer with anti-lock brake control system and the cooperation layer developed on a new cooperative error model. It is quite feasible because of its analytical form. Finally, the stability and the validity of the control algorithm are validated by simulation results.
Design and Performance Analysis of Digital Pressure Relief Valve of Water-Based Hydraulic
Authors: Jia Tian Chi , Wu Zhang Yong , Wang Juan , Feng Ru Guang , Qin Yan Jin
Published: August 2013

this paper use the stepper motor as driver, designed the structure of a digital pressure relief valve of water-based hydraulic, and establishment mathematical model of the valve element cavitation flow field, simulated and analyzed the different the valve element cavity volume and rounded of water pressure relief valves cavitation flow field by use Fluent software. The results showed that: It can suppressed cavitation that appropriate increases cavity volume and reduced the spool fillet.
Energy-Saving Switch - Boost Converter
Authors: Han Chun Juan , Rui Fa Cheng
Published: August 2013

High-efficiency, energy-saving and environment-protection have become the current consensus of the world. The basic requirement of energy-saving for domestic appliances and electronic products has been accomplished to reduce the power on standby. The key point of energy-saving is to decrease the loss damaged in the switch. Boost converter (DC/DC) is a lower-loss, higher-efficiency module with the 90% conversion rate.
Research on Fluid Mechanics with Slip Flow of Viscoelastic Fluid in the Micro Channel
Authors: Liu Zheng , Zhu Jing , Zheng Lian Cun
Published: August 2013

Stagnation flow, an import research branch of fluid mechanics, describing the fluid motion near the stagnation region, exists on all solid bodies moving in a fluid. And stagnation point boundary layer flow problems described by partial differential equations have attracted many scholars attention nowadays. These problems have become difficult and hot in the study of applied mathematics, mechanics and materials engineering. This paper has transformed the governing boundary layer equations into a system of nonlinear differential equations through the similarity transformation, and the analytical approximations of solutions are derived by homotopy analysis method (HAM). In addition, the effects of physical factors (such as the slip parameter, Magnetic field parameter and Reynolds number) on the flow are examed and discussed graphically. They have a great impact on the speed.
Numerical Study of Fluid Flow and Heat Transfer Enhancement of Nanofluids over Tube Bank
Authors: Wahid Mazlan Abdul , Gholami Ahmad Ali , Mohammed H.A.
Published: August 2013

In the present work, laminar cross flow forced convective heat transfer of nanofluid over tube banks with various geometry under constant wall temperature condition is investigated numerically. We used nanofluid instead of pure fluid ,as external cross flow, because of its potential to increase heat transfer of system. The effect of the nanofluid on the compact heat exchanger performance was studied and compared to that of a conventional fluid.The two-dimensional steady state Navier-Stokes equations and the energy equation governing laminar incompressible flow are solved using a Finite volume method for the case of flow across an in-line bundle of tube banks as commercial compact heat exchanger. The nanofluid used was alumina-water 4% and the performance was compared with water. In this paper, the effect of parameters such as various tube shapes ( flat, circle, elliptic), and heat transfer comparison between nanofluid and pure fluid is studied. Temperature profile, heat transfer coefficient and pressure profile were obtained from the simulations and the performance was discussed in terms of heat transfer rate and performance index. Results indicated enhanced performance in the use of a nanofluid, and slight penalty in pressure drop. The increase in Reynolds number caused an increase in the heat transfer rate and a decrease in the overall bulk temperature of the cold fluid. The results show that, for a given heat duty, a mas flow rate required of the nanofluid is lower than that of water causing lower pressure drop. Consequently, smaller equipment and less pumping power are required.
Early Flame Development in the Combustion of Droplet and Vapour Mixtures
Authors: Saat Aminuddin , Wahid Mazlan Abdul , Mohd Farid Muhamad Said
Published: August 2013

Experimental investigations of combustion of droplet and vapour mixtures under quiescent condition have been conducted in a closed combustion vessel. Droplet and vapour mixtures or aerosol mixtures were generated by expansion of iso-octane gaseous pre-mixture to produce a homogeneously distributed suspension of fuel droplets. The aerosol mixtures were ignited centrally in the combustion vessel and the flame development was recorded by schlieren photography. The effect of fuel droplets in the early stage of flame propagation was investigated by comparing the flame structure and flame speed of gaseous mixtures at identical conditions. Comparison between gaseous and aerosol flame have shown quantitatively that the presence of fuel droplets causes earlier onset of instabilities and cellularity than for gaseous flames, particularly at rich conditions. This difference was shown to be a function of droplet size and overall equivalence ratio. It is suggested that these factors lead to vary the local equivalence ratio which increases the initial burning rate of lean aerosols, but decreases that of rich ones.
Design of a Four-Stroke Homogeneous Charge Compression Ignition Engine
Authors: Perang Mohd Rozi Mohd , Zulkarnain Abdul Latiff , Aziz Azhar Abdul , Mokhri Mohamad Azzad
Published: August 2013

This research is to study the operation of the four-stroke HCCI engine. The design and analysis works have been performed using computer software which is GT-Power and Solidwork to study on the engine performance simulation work and 3-D modelling on the combustion chamber designed respectively. The design is based on 4-cylinder passenger car, 2000 cc and a four-stroke cycle engine. The compression ratio used is 10. The fuel used is ethanol in which the air-fuel ratio (AFR) is 9. The parameters selected have typical range of value based on the previous study and research done. With the use of GT-power, the analysis will consider two parameters which are the cam timing angle and the injection timing angle to get the optimum result for the HCCI engine. The typical angle of cam timing angle is between 2600 – 2700 since this is the moment of the compression cycle of the engine. For the injection timing angles, the angles that will be studied for this project are 50, 00, -50, -100,-150 and -200 relative to Top Dead Centre (TDC). The objective is to obtain the maximum torque and brake power when the engine speed is in between 4000 rpm to 5000 rpm and 6000 rpm to 7000 rpm respectively. Finally, the optimum conditions for the engine to perform better are at 2640 of cam timing angle for the valve and at -50 before TDC for the injection timing angle. The maximum torque and brake power achieved is 37.60 Nm at 4000 rpm and 23.46 kW at 7000 rpm.
Simulation of Corrected Mass Flow and Non-Adiabatic Efficiency on a Turbocharger
Authors: Ibthisham A. Mohd , Rajoo Srithar , Darus Amer Nordin , Wahid Mazlan Abdul , Sies Mohsin Mohd , Saat Aminuddin
Published: August 2013

The aim of this project is to evaluate turbine’s performance based on its actual condition. Holset H3B nozzles turbine geometry was used as simulation model. Turbine’s actual working condition was simulated using finite volume method (FVM). Three-dimensional Navier Stoke equations with heat convection loss via turbine volute are solved. The parameters studied are corrected mass flow and turbine’s efficiency at different heat transfer coefficients. Temperature difference within turbine’s volute is the major factor that deteriorates turbine’s efficiency. It is found that the higher the heat transfer coefficient, the lower turbine’s efficiency will be.
Investigation of Vortex Reacting Flows in Asymmetric Meso Scale Combustor
Authors: Khaleghi Mostafa , Wahid Mazlan  A. , Seis Mohsin M. , Saat Aminuddin
Published: August 2013

In the current study computational and experimental investigations of a turbulent asymmetric vortex flame is presented. The three dimensional flow fields have been described using a computational methodology that impalements the kε turbulence model. The computational model is validated for isothermal flow. Moreover, the visible flame structure was captured by direct photography at a wide range of equivalence ratios in order to emphasize the exceptional stability of such flame. The mechanism of flame stability and interaction with the forced vortex field is preliminarily discussed. Finally, the basic characteristics of the asymmetric vortex flames are concluded.
Entropy Generation in Turbulent Swirl-Stabilized Flame: Effect of Hydrogen Enrichment
Authors: Saqr Khalid M. , Wahid Mazlan  A.
Published: August 2013

A set of numerical simulations were conducted to estimate the change in entropy generation in swirl stabilized CH4/air flames due to H2 addition to the fuel. A robust finite volume computational model solving the Reynolds Averaged Navier Stokes with a first order turbulence closure and laminar flamelet combustion model was used to compute the flow and energy fields in the flame. Hydrogen enrichment resulted in an increase in the entropy generation rate of the flame. Such increase was attributed to the increase in heat transfer irreversibilities due to flame temperature rise.
Pulse Detonation Engine Research Development at High Speed Reacting Flow Laboratory - HiREF, Universiti Teknologi Malaysia
Authors: Wahid Mazlan A. , Dairobi Ahmed G. , Saat Aminuddin , Sies Mohsin Mohd , Mohammed Hussein A. , Darus Amer Nordin , Mohd Faizal H. , Ibthisham A. Mohd , Fairus M.Y.
Published: August 2013

The Pulse detonation Engine (PDE) research program has been started at High Speed Reacting Flow Laboratory (HiREF), Universiti Teknologi Malaysia (UTM) since 2005. The studies began with a single pulse detonation study for detailed investigation of detonation characteristics of various fuels and followed by development of repetitive PDE engine, performance study and augmentation of thrust using various types of ejectors. This paper summarizes the laboratory facilities, research activities conducted and the output from all of the related research programs.
The Effect of Fuel Additives on Gasoline Heating Value and Spark Ignition Engine Performance: Case Study
Authors: Latiff Zulkarnain Abdul , Aziz Azhar Abdul , Mohd Perang Mohd Rozi , Abdullah N.
Published: August 2013

Today fuel additives had been used widely for the enhancement of fuel economy and engine performance. Fuel additives are substance that acts as catalysts for the completeness combustion of fuel in order to increase the heat released and hence the work output will be improved. The purpose of this paper is to investigate the effect of the additives on fuel heating value and engine performance. In this study, three different additives available in the market have been chosen to determine the effect on heating value and engine performance when mixed with fuel. Two types of test were conducted, namely the calorific value and engine performance test. The first test was conducted using a bomb calorimeter with test method in accordance with the DIN 51900 and ASTM D240. The later test was done using engine test bed and with the agreement of BS 5514 (Parts 1 to 6), Reciprocating Internal Combustion Engines: Performance, and SAE 1349 Standard Engine Power Test Code. The study shows that fuel additives can cause a standard fuel to have higher heating value up to 5%. As for the engine performance, the engine brake thermal efficiency and brake mean effective pressure were increased up to 8% and 10% respectively. The specific fuel consumption can be reduced up to 9%.
The Influence of Temperature in Wear Resistance Characteristic of Palm Fatty Acid Distillate
Authors: Syahrullail Samion , Abdul Rahman Muhammad Amirul
Published: August 2013

Palm fatty acid distillate (PFAD) has potential to be used as a lubricant. PFAD is a by-product from palm oil refinery, and it is classified as non-edible oil. However, vegetable oil has poor thermal performance and high oxidation rate. In this paper, the tribological performance of PFAD in different working temperature was investigated by using four-ball tribotester. Tests were conducted at temperatures 50oC, 75oC, 100oC and 125oC, under a normal load of 40 kg for one (1) hour. The rotational speed was set at 1200rpm. Similar tests were conducted using industrial hydraulic oil as a comparison lubricant. Analyses were focused on the coefficient of friction (CoF), wear scar diameter (WSD) and worn surface observation. Results show that coefficient of friction and wear were increased with the increment of temperature. However, palm fatty acid distillate show a better performance in term of friction reduction compared to industrial hydraulic oil.
A Study on the Kinetics of Propane-Activated Carbon: Theory and Experiments
Authors: Ismail Azhar , Loh Wai Soong , Thu Kyaw , Ng Kim Choon
Published: August 2013

Experimental kinetics results of propane in Maxsorb III activated carbon is obtained at temperatures of 10°C and 30°C, and pressures up to 800kPa using a magnetic suspension balance. A multi-gradient linear driving force (LDF) approximation is used for adsorbate uptake as a function of time. The LDF mass-transfer-rate coefficients were thus determined. Using this approach, the experimentally derived LDF coefficients based on independently measured kinetic parameters for propane in the activated-carbon bed agree very well with experimental results. The computational efficiency is gained by adopting this extended LDF model.
Collaborative Filtering Recommendation Based on User Character
Authors: Quan Zhi Chao
Published: August 2013

Traditional collaborative filtering recommendation system put emphasis on data but ignores the users. The recommendation of the similarity analysis emphasizing too much from the data perspective lacks depth analysis of the users without regarding the similarity from the users perspective. In this paper, user character is introduced to improve the user model, and two character-based collaborative filtering recommendations will be proposed: one is to compute user similarity from the user character perspective and select nearest neighbor, and then generates recommendation; another is based on the character-item rating matrix, and then make recommendation to the prospective users. These two ideas can well make up for the inadequacies of the current collaborative filtering recommendation system.
The Application of State Overhaul in Power System Plant Based on IOT
Authors: Wang Zu Min , Sun Hui Lin
Published: August 2013

The state overhaul is not only a kind of maintenance system, but also a kind of management system, which is especially important and widely used in power system. However, in recent years, along with the power system in large-scale development of high parameters and automation, only relying on the traditional sate maintenance already cannot satisfy the power system safe and stable operation requirements, and the emergence of the state overhaul based on Internet of things technology can well solve the problem. After the review of the application of state overhaul in power system based on Internet of things technology in this paper, emphatically expounds the applications of state overhaul based on Internet of things technology in power plants, transmission and substation equipment. Pointed out that state overhaul based on Internet of things technology is the key to realize the fusion between smart grid and IOT . Finally, make outlook the related research of state overhaul in power system based on Internet of things technology.
Biodiesel Production through Direct Transesterification of Waste Cooking Oil with Alcohol via Ultrasonic Wave
Authors: Kang Yong Feng , Shi Hua Jin , Yang Lin Ge , Kang Jun Xia , Zhao Zi Qi
Published: August 2013

Biodiesel is prepared from waste cooking oil and methanol. The ester exchange reaction is conducted under ultrasonic conditions with alkali as the catalysts. Five factors influencing on the transesterification reaction of biodiesel production are discussed in this study, including the reaction time, reaction temperature, catalyst amount, methanol to oil molar ratio, ultrasonic power. A series of laboratory experiments were carried out to test the conversion of biodiesel under various conditions. The process of biodiesel production was optimized by application of orthogonal test obtain the optimum conditions for biodiesel synthesis. The results showed that the optimum reaction conditions were:molar ratio of oil to methanol 8:1,catalysts 1.2g KOH/100g oil,reaction temperature 70°C, reaction time 50 min,Ultrasonic power 400W. The conversion may up to 96.48%.
Small Wind-Solar Hybrid Generation Equipment Design
Authors: Luo Ping , Zhao Kai , Zhang Duo
Published: August 2013

Solar energy and wind energy is the important renewable energy source, a control strategy of small wind-solar hybrid generator equipment is present based on Programmable Logical Controller (PLC). A maximum power point tracking (MPPT) control method was used to increase the efficiency of the using of wind and solar energy.
Employing Ceramic Products to Design an Electrostatic Discharge Protection for High-Speed Signal Lines
Authors: Wang Jing Min , Lin Chun Ting
Published: August 2013

With the advance of microelectronics technologies and integrated circuits (ICs) processes, the electrostatic discharge (ESD) has become one of the most important reliability issues in IC products. But treating the ESD-related problems is a real challenge. The paper focuses on the influence of the using of Universal Serial Bus (USB) in plugging and/or unplugging impact arisen from ESD and also proposes an ESD protection design to improve the ESD robustness. This work utilizes off-chip protection along with the commercial ceramic products to achieve effective ESD protection. The impact of the ESD stress applied at the connector pins of USB is evaluated. The protection design for the high-speed signal lines is easily to implement and achieves the following attractive features: (1) Power trace protection, (2) Signals traces protection, (3) GND protection, and (4) Shield protection. Numerous tests have been made to demonstrate the effectiveness of the work.
Bulk-Sheet Forming Process for Products with Thin Wall and Thick Rim
Authors: Jung K.H. , Lee H.C. , Lee S. , Kim E.Z. , Song Jung Han
Published: August 2013

In this study, a novel process to forge thin walled products using bulk-sheet forming concept is developed to overcome drawbacks of a conventional multistage backward extrusion. A newly developed process design is suggested based on numerical analysis, and feasibility of one-stage forging process is discussed.
Study on the Influence of Low Temperature Plasma Treatment on the Interfacial Property of Thermoplastic Composite
Authors: Cui Xu , Liu Gui Long , Lu Chun , Wang Shuo
Published: August 2013

The roughness and stripe of the carbon fiber surface is increased, what is in favour of the combination of fiber and resin, and also increases the active ingredient of fiber surface, by using the low temperature plasma on carbon fiber surface treatment. In this paper, we research the influence of CF/PES-C material ILSS with low temperature plasma treatment. Experimental results show that the low temperature plasma treatment improves the interfacial adhesion performance of CF/PES-C composite material, so that it mends the interfacial property of the composites.
Purification Experiment Research of Quartz Sand
Authors: Nie Yi Miao , Lu Xiao Long , Niu Fu Sheng
Published: August 2013

In this paper, strong intensity magnetic flotation-acid leaching was used to separate feldspar, mica and quartz. And after the mixed acid leaching, the final quartz concentrate flotation was gained. After the sorting process of magnetic-flotation-acid leaching, the quartz concentrate was 99.19%, and the iron content was 0.016%. The quartz product quality meet the quality standards of the national concentrates level, and can be used as materials of glazed ceramic material, glass and other raw materials.
An Overview of Bioconcrete for Structural Repair
Authors: Irwan J.M. , Othman Norzila
Published: August 2013

In Malaysia and worldwidely, concrete is one of the most popular construction material because of its strong, durable and inexpensive material. It has speciality of being cast in any desirable shape but plain concrete however is porous, possesses very low tensile strength, limited ductility and little resistance to cracking. These problem become more complicated in various environmental condition like Malaysia to which concrete is exposed. Conventionally, a variety of sealing agent namely, latex emulsions suffer from serious limitations of incompatible interfaces, susceptible to ultraviolet radiations, unstable molecular structure and high cost. Therefore, a novel and more environmental friendly technique is proposed for treating concrete material in structure by employing bacteria induced calcium carbonate precipitation in the form of calcite
Progress in Research of Brønsted Acid Ionic Liquid Catalysts for Synthesis of Biodiesel through Esterification of Fatty Acids
Authors: Han Ben Yong , Deng Rong Qun , Li Tao , Xiong Xiang Feng , Chen Chao Yin
Published: August 2013

Biodiesel has attracted considerable interest in recent years as an alternative, biodegradable and nonpolluting transportation fuel. Conventional alkaline process for biodiesel production are energy consuming and generate undesirable by-products such as soaps, that make difficult the separation and purification of biodiesel. Ionic liquids as environmentally benign chemical solvent, had been used in diverse chemical reactions. Especially, they could be applied in biodiesel production. Preparation of biodiesel catalyzed by ionic liquids have many merits, such as no corrosion to equipment, no pollution to environment, and reusability. Ionic liquids can improve the catalytic activity and they have wide utilization prospect in biodiesel preparation. In this paper, the advances in the Brønsted ionic liquids catalysts and their application in biodiesel production through esterification of fatty acids were reviewed. In addition, the prospect for the application of the ionic liquids to catalyze biodiesel production was also stated. Since the cost of ionic liquid may be an issue, there are some challenges to be faced, such as the production of ionic liquids with low cost, easy recovery and with the possibility of reutilization of the catalyst for several cycles.
SAGE-ML Joint Estimation and Detection Algorithm in MIMO-OFDM Systems
Authors: Gao Jing Peng , Zhao Dan Feng , Wu Chao Qun
Published: August 2013

In order to improve the decoding performance of MIMO-OFDM system in the case of the channel state information is not accurate enough, a new algorithm is proposed, which combines SAGE algorithm, DFT-LS channel estimation and maximum likelihood detection algorithm. The algorithm utilizes joint iterative technology to achieve channel estimation and decoding effect, thereby enhances the reliability of the system. Theoretical study and simulation results show that the proposed algorithm can track the channel change correctly without increasing the system overhead, and the convergence speed is accelerated. Besides, the performance is superior to the commonly used joint detection algorithm. Moreover, comparing with the ideal channel estimation under the maximum likelihood detection algorithm, the new proposed algorithm only has a loss of 0.5dB with the same bit error rate.
Finite Element Analysis of Converter Tilting Mechanism Helical Gear Reducer in Abnormal Meshing Condition
Authors: Guo Zhi Qiang , Zhao Yue Fan , Ren Xue Ping , Liang Li
Published: August 2013

Considering abnormal meshing condition of converter tilting mechanism helical gear reducer,creating 3D helical gear models under normal meshing condition and abnormal meshing condition. By using the finite element method to perform a nonlinear contact analysis on helical gear, the results of gear contact stress under different meshing conditions was obtained. It provides a theoretical basis for the accurate analysis of the reasons for the failure, the optimum design and safe use of the gear.
Effect of Temperature Change on Capacitance of RF MEMS Clamped-Clamped Capacitive Switch
Authors: Cao Tian Jie
Published: August 2013

The effects of temperature change on the pull-in behavior and on the capacitance of the RF MEMS clamped-clamped capacitive switch are quite heavy because of the larger slenderness ratio of the MEMS clamped-clamped switch beam. A one-dimensional three-stage static model with temperature change for analyzing the beam was presented based on the small displacement assumptions, in which the clamped-clamped beam was subjected to both the electrostatic forces and the temperature change. First, the model was used to calculate the capacitance of the RF MEMS clamped-clamped capacitive switch in different states. Then , the effects of temperature change on the capacitance of the clamped-clamped capacitive switch for some different geometry dimensions were analyzed. From the analysis the effect of some geometry dimensions, such as the length of the beam, the depth of the beam and so on, at different temperature changes on the capacitance can be understood and some conclusions may be useful to the design of the MEMS clamped-clamped capacitive switch with the temperature change.
Research on Guide and Control Method of Air Launched Ballistic Missile
Authors: Zheng Xiao Long , Li Bang Jie , Shi Zhi Fu
Published: August 2013

In order to further improve the performance of the air launched ballistic missile, a full range of air launched method had been given. For the full range launch program faced initial roll angle and initial lateral speed problem, researched the initial roll angle control mode processing technology in the virtual body coordinates and correct the lateral initial velocity method used angle of sideslip flight procedures. Given the ballistic flight simulation Using the proposed method and technology, and verified the feasibility of the ballistic missile program of all-round air launched.
The Design and Implementation of Experimental Apparatus of Magnetic Levitation
Authors: Xiao Li Zhu , Xie Zhong , Gou Zhi Jian , Li Zhi Hong , Ou Zheng Wei
Published: August 2013

Completed the design of experimental apparatus of magnetic levitation based on ADuC832 microcontroller and discussed the experimental results, the relationship between the forces on permanent magnet and the velocity of non-ferromagnetic conductor can be measured with strain gauge position sensor and photoelectric sensor. A magnet can be non-contact driven to rotate around its central axis by moving conductor, the relationship between the rotational speed of permanent magnet and the velocity of conductor can measured with bias circuit, verifying the correctness of the theoretical analysis. The experimental apparatus of magnetic levitation is well applied in experimental teaching.
Design of Control System of Gemstone Processing Machine Based on CAN-Bus
Authors: Li Da Zhai , Jiang Zhe , Yang Chun Wei
Published: August 2013

Aimed at protecting synthetic gemstone processing workers from silicosis that caused by continuously working along machines, a remote-control machine based on CAN-bus is designed. This paper focuses on introducing the hardware and software of its control system. ARM processor STM32F103VET6 with Cortex-M3 core is selected as the MCU, and with the application of motor driver, touch screen and special software, the system can implement auto-operation and manual-operation flexibly. Test data indicates that the control system is stable, easy to operate and suitable to be promoted in factory.