bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Implementation of FPGA-Based JPEG Decoding IP Core and its Application in Digital Watermarking
Authors: Yu Qun Xiu , Zhang Shou Ming , Wang Chao , Xie Li Zhi
Published: March 2015

In this paper the digital watermarking algorithm deep into the field of integrated circuits combined with the JPEG image watermarking processes and SOPC technology, Verilog HDL language is used to design and implement of a reusable JPEG decoder IP core which can be embedded, realizing the JPEG decoding on FPGA platform and further completing the watermark embedding. The JPEG decoder is tested through the Modalism simulation software and would be revised until the simulation results become correct. Finally, the Altera development board EP2C70F896C6N of CycloneII series is used to complete the system design. The results prove that the system can run well, the program which can obtain a larger increase speed in exchange for consuming a little hardware resource does work.
Health Monitoring Research Based on Fiber Bragg Grating Sensing Technology in Concrete Pouring
Authors: Zhu Kai , Zheng Si Guo , Liu Gang , Zhang Qing Chao
Published: March 2015

Aiming at the problem of hard to monitor features such as temperature, strain in time in large concrete pouring construction process during the construction of urban underground substation, this paper presents applying fiber Bragg grating sensors to collect temperature and strain data in the process of concrete pouring, then demodulating them, and transmitting them to the computer terminal, finally proceeding the real-time online monitoring. Moreover, this paper establishes the 3D models of temperature field and strain field on the basis of one pouring pile, then proceeds dynamic simulation and real-time observation, which can provide certain theoretical support and technical guidance for the site construction, further improve work efficiency, safety and reliability.
Research of License Plate Recognition System Based on Labview
Authors: Hu Zhong Hua , Tang Chen
Published: March 2015

The vehicle license plate recognition system is the intelligent traffic management system based on the image and the character recognition technology, which is an important part of the intelligent transportation system. This paper introduces a method of vehicle license plate location based on edge detection and morphological operations, virtual instrument is combined with machine vision of the license plate recognition method [1]. Finally the license plate number of the vehicle is get. Experiment results show that such method can simplify the algorithm and has some correct location rate.
Research on the Vibration Condition On-Line Monitoring System for EHV Power Transformer
Authors: Li Wan Qing , Wang Wei , Lin Le Ting , Xie Bei Min , Xia Ming Chao , Liu Ping Zhu , Ma Wei
Published: March 2015

The paper introduces a design scheme for the Extra High Voltage (EHV) transformer condition on-line monitoring system, which is based on the collection and analysis of the transformer winding and core vibration signals. This system is composed of vibration acceleration signal sensors and the signal analyzing computer where the collected vibration signal is saved and processed. The analyzing computer can accomplish the missions of data acquisition control, data analysis and the historical data query. Vibration characteristic values of transformer winding and core include peak to peak value, spectrum, kurtosis, and the amplitude 100Hz component and its higher harmonic components. They are extracted, and the characteristic trend curves are drawn by data analysis, so that EHV transformer on-line monitoring and fault diagnosis are accomplished.
Static Reactive Power Compensation of Generator Design Based on TMS320LF2407
Authors: Liu Yong Tao , Wang Hui Jun , Liu Jia , Xu Wei Wei
Published: March 2015

In this paper, we study a kind of method which using DSP processor to control the reactive power compensation of generator. In the main circuit, power electronic switching devices on all control type (IGBT) is used as the main device of inverter, and controlled by SVPWM technology on and off to produce pulse. The generator to a digital signal processor as the core processor, the processor can quickly complete the data processing and real-time data sampled signal calculation tasks, the power system to achieve a fast response of the dynamic compensation, given the various modules of the system program flowchart.
The Design and Implementation of Condition Monitoring and Decision Support System in HVDC Converter Station
Authors: Jin Wei Wei , Yu Cun , Yang Xing Chao , Geng Zhan Xia , Zhang Hao Ran , Li Feng Long , Yan Jing Wei
Published: March 2015

The shortcomings of current on-line condition monitoring system include: the research was concentrated in AC substation; the function was single and completely independent; the protocols were not compatible and the interface was not unified. To improve these disadvantages and better satisfy the needs of the condition monitoring in converter station, the design and implementation of condition monitoring and decision support system in HVDC converter station was realized. By studying of condition monitoring method, decision support technology and engineering application of HVDC project, the system design principle was discussed, the software structure was shown and the function realization was given in detail. The implementation realized real time monitoring for running equipments, provided reliable gist for maintenance and reduced the costs of resources. The implementation is applied to HVDC project witch has a great significance in improving the operation efficiency and promoting the smart grid construction.
Based on LabVIEW Three-Stage Current Computer Protection Experimental System
Authors: Tian You Wen , Zhao Hua Song
Published: March 2015

Current microcomputer protection experimental system is created based on LabVIEW. Each module was created based on the modular thinking (data acquisition module, start module, algorithm module). Functions of microcomputer protection were implemented. Fault data was generated by fault simulation software MATLAB. LabVIEW controls and loop structure achieved simulating a variety of action logical relationship of computer protection. This system had many advantages, such as visibility, controllability, authenticity and flexibility. The system was able to verify the performance of computer protection at different fault. The system was also able to analyze the situation of computer protection maloperation and misoperation, thus it further provided teaching platform for the three section current microcomputer protection experiment.
Power System Adequacy Exploration Based on UC Simulation Model
Authors: Li Zhen Bin , Zhai Xiao Lei
Published: March 2015

This paper takes Unit Commitment with Wind Power Electric Systems for instance and studies the application of relevant indicators in the short run adequacy decisions. It first conducted running adequacy assessment of the RBTS system, and then given unit combination solutions in the ample index constraints. The results show that the relevant indicators can be more accurately to depict the influence of random factors on system operation adequacy, and Unit Commitment decisions based adequacy index is able to give a unit commitment program at different adequacy levels. The research results provide a set of assessment indicators and assessment methods for short running adequacy problems of random fluctuations power accessing to large-scale power systems..
Coordinate Measurement System for Copper-Clad Plate
Authors: Hou Li Juan , Mao Fu Xin
Published: March 2015

For getting the coordinate of contactor on CCL, the measurement system transformed resistance into voltage by providing constant current on CCL. The system includes MCU, 3A constant current source, MOSFET switch circuit, signal amplifier circuit and A/D converter. By the curve-fitting method, the equipotent lines of CCL were simulated with MATLAB according to the discrete data. The equations of equipotent lines were obtained with second-order polynomial fitting method. The two curves which the contactor located in were acquired with local linearization method, and the coordinate was gained by calculating solving equation groups.
Maximum Power Point Tracking for the Micro-Scale Photovoltaic Power System
Authors: Han Lei , Wang Xia , Wang Guang Wei
Published: March 2015

In this paper, we give a comprehensive consideration on the maximum power point tracking (MPPT) algorithm for micro-scale solar energy harvesting system. Basing on the comparison analysis the MPPT algorithm of fractional open circuit voltage (FOCV) is certificated to be the simplest method among all the algorithms focus on small size photovoltaic devices. As a validation, an example is given to demonstrate the effectiveness of the proposed idea.
Properties of Sputtered-n-nc-Si:Er/p-Si Heterojunction Solar Cells
Authors: Wang Guang Wei , Lu Sheng Li , Zhao Xin Wei
Published: March 2015

Nanocrystalline Si:Er (nc-Si:Er) films were sputtered on p-Si (100) substrates and diffused with phosphorus to form PN heterojunction diodes. The I-V properties of these diodes were characterized. And the properties of diodes without Er were compared with n-nc-Si:Er/p-Si. It was found that n-nc-Si:Er/p-Si diodes had better characteristics. Solar cells based on n-nc-Si:Er/i-nc-Si/p-Si were fabricated and characterized. The photoelectrical conversion efficiency of 18.13% for n-nc-Si:Er/i-nc-Si/p-Si solar cell was achieved.
Research of Electronic Forensics Model and Key Technology for Intelligent Terminal
Authors: Wan Guo Gen , Tie Ling
Published: March 2015

The present study about forensics technology intelligent of electronic terminal is mainly in utility demand, and there are many shortcomings in the point of view of forensics mode, evidence standard, forensics technology comprehensive etc.. This article conducts the research from the legal standard, technical standard, technical model, key technology and other aspects of the intelligent terminal of electronic forensics. Firstly , the characteristics and requirements of the intelligent terminal in electronic evidence are analyzed, the status of the domestic and foreign research about intelligent forensic is also analyzed. Then the electronic forensics model of intelligent terminal is proposed in terms of legal standards, technical standards, technical model, key technologies, and in the model as a guide, the related technologies of electronic evidence extraction, evidence analysis, evidence preservation, and other in the intelligent terminal are studied. Forensic Model and related techniques are proposed in this paper have important theoretical and application value for the Judiciary to electronic forensics in intelligent terminal.
A Ultra -Super Efficiency Induction Motor Based on the Finite Element Analysis
Authors: Liu Chang Qi , Xu Yu Fa , Li Quan Feng , Bian Jin Hua
Published: March 2015

In order to increase the cost and material conditions as little as possible for improving the efficiency of the motor, and reduce the losses of the motor. This paper have YE3-132S-6X3 super-efficient motor loss analysis first. According to the characteristics of its loss analysis, this paper change the motor slot coordination, and through the finite element analysis, further has carried on the design of slot type and winding. Finally, in order to further reduce iron loss, this paper uses the new type of silicon steel, and then by comparing with the finite element analysis and experimental tests found YE3-132S-6X3 motor efficiency have achieved the purpose of the ultra-super efficient, and other performance parameters can also meet the requirements.
Model Reduction of Potential Transformer Based on Revised Minimum Information Loss Method
Authors: Liang Gui Shu , Liu Xi Xiao , Zhang Shu Wei
Published: March 2015

The circuit model of potential transformer (PT) is indispensable in accurately simulating the electromagnetic characteristic under the lightning overvoltage and very fast transient overvoltage in power systems. This paper utilizes a reduction algorithm for potential transformer based on revised minimum information loss method (RMIL). First, we measured a 10 kV single phase potential transformer using the Agilent 4395A network/spectrum/impedance analyzer. Second, we obtained the rational approximation of two-port circuit parameters by vector fitting (VF). At last, revised minimum information loss method is applied to reduction the state equation of circuit parameters. Comparisons between the reduced and original are given to illustrate the approximating performance of RMIL.
Positron Annihilation in ZnO Based Varistor Doped with Semiconductor Additives
Authors: Yang Tie Zhu , Zhu Qi Tao , Wei Juan Juan , Zhang Zhi Qiang , Zhang Rui Rui , Meng Shu Sheng , Wang Xiu Zhen
Published: March 2015

Coincidence Doppler broadening spectra measurements on ZnO-based varistor doped with semiconductor additives have been investigated, and the proposed samples exhibit different characteristics. The peak of the ratio curve of pure zinc is the highest, the Positron Lifetime in sample a03 doped with ZT is the longest. The maximum probability of the positron-3d electron occurs in sample doped with semi-ZnO (sintered at 1300 °C for 2h with conventional ceramic processing method). The electrical characteristics of the samples and the behavior of positrons in ZnO-based varistor have been discussed.
Shielding Effectiveness Analysis of a Spherical Shield Made of Medium Conductivity Material against Low-Frequency Electric Field
Authors: Li Ming Yang , Jiao Chong Qing , Nie Jing Kai
Published: March 2015

With quasi-static field approximation, an analytic formula is derived for shielding effectiveness analysis of a spherical shield made of medium conductivity material (10 S/m-1000 S/m) against low-frequency electric field. The effects of frequency, material conductivity, and shield dimensions on shielding effectiveness are investigated. It is shown that the shielding effectiveness decreases at first and then increases with the frequency increasing from DC to MHz if the thickness of the shield is large. However, the shielding effectiveness decreases versus the increase of frequency continuously if the thickness is small. The shielding effectiveness can be enhanced by increasing either the material conductivity or the shield thickness. This research is helpful for the evaluation of composite conductive material for electromagnetic shielding applications.
Step-Up DC/DC Transformer Based on LLC Resonant Full Bridge
Authors: Xiong Ze Cheng , Yin Qiang , Luo Zhi Jun , Pang Hao
Published: March 2015

In view of the LLC series resonant converter topology, it is well known as suitable for small and medium power application, the stabilization of output voltage and the environment of step-dowm. The scheme is proposed for a kind of the step-up DC/DC transformer based on LLC resonant full bridge. The detailed design method is given. The 3KW prototype is built. The experimental results show it has the characteristics of the constant current discharge, wide working frequency and high power desity, as well, the feasibility is verified.
The Output Filter Identification of Three-Phase PWM Converter Using Weighted Least Square Method
Authors: Zhang Yi Long , Zhang Xue Guang
Published: March 2015

This paper proposed the Weighted Least Square method (WLS method) to identify the output filter of three-phase PWM converter, which incorporates the signal processing as well as mathematical techniques into conventional Least Square method. It sets different weights to different measurements according to the phase where it locates, based on the discovery of the correlation between accuracy and phase of current. The algorithm is tested in both simulation and experimental environment, and the results validate that proposed method gives accurate estimation in steady state, and can response within 10ms in when grid voltage drops. This method can work under both balanced and unbalanced operating conditions, therefore provides a powerful tool for various control strategies to better understand the operating conditions. Compared with the invasive method, which intentionally inject a series of white noise in the system, proposed WLS method does not bring any turbulence, while compared with conventional Least Square method, it possesses better stability as well as higher accuracy.
Research on Power Quality Assessment Improvement of Marine Electric System
Authors: Song Yan Qiong , Zhong Bi Liang , Bai Ming
Published: March 2015

In order to enhance ships' security and stable energy efficiency,there are new challenges about the means on power quality assessment improvement of marine electric system. This paper analyzed the importance to the ship’s safety for quality of electricity,and discussed present situations about the question of poor power quality in marine electric system; moreover,especially proposed reasonable means on power quality assessment and more effective and practical means on improvement of marine electric system,through massive studies the experiment repeatedly using the mature control theory and computer simulation technology,as well as instance of three-phase harmonic filter for controlling harmonic distortion,based on the Matlab simulation software to establish the 12 pulse (AC - DC) converter simulation model; finally emphasized the future research directions and prospects of the electric utilization and marine engineering technology development.These important means may promote energy conservation and reliability enhancement to more deeply research on power quality assessment improvement of marine electric system.
The Modeling and the Stability Control of the DC Converter Based on the Matlab/Simulink
Authors: Li Fu Long , Zhang Wen Zheng , Liu Xiao Peng
Published: March 2015

There is an important practical value of the state space average method in the modeling of the DC/DC converter. Compared with the state space average method, the equivalent circuit modeling method is more intuitive and the physical meaning is clearer. Under the assumptions of the ideal switch, small signal, small ripple and low frequency, taking Cuk converter as an example, the equation of state and the equation of state of the Ac small signal are deduced. The correctness and rationality of the two methods are proved by using the Matlab / Simulink software, and the stability of the system is improved by designing a PI controller.
Centralized Inter-Network Resource Allocation Scheme in Wireless Body Area Network
Authors: Zhang Li , Shi Tian Tian , Xu Chang Biao
Published: March 2015

In this paper, a centralized inter-network resource allocation scheme is proposed aiming at the inter-network interference problem in Wireless Body Area Networks (WBAN). To achieve the goal, a centralized inter-network resource allocation algorithm called CRAS is proposed. Extensive simulation results show the effectiveness of CRAS in ensuring the normal communication of WBAN users and reducing allocation failure number, comparing with RAN.
Design and Implementation of Classroom Intelligent LED Lighting Control System
Authors: Li Min , Lu Sheng Li , Wu Rong Rong , Wang Guang Wei
Published: March 2015

A new type of classroom intelligent LED lighting control system is proposed, because of the energy waste, inconvenient management and other issues. This system achieves a good control and adjustment of classroom intelligent LED lighting, by taking PC as the central controller, microprocessor as control unit and using POWERLINK Industrial Ethernet as the communication network.
PLC-Based Street Lighting Energy-Saving Equipment and its Remote Monitoring System
Authors: Guo Yuan Bo , Du Shu Ming , Luo Jin , Wang Zi Ru , Zhang Xiao Hua
Published: March 2015

PLC (programmable logic controller)-based street lighting energy-saving and remote monitoring system is designed to improve energy-saving technology and management level. The designed illumination economizer contains PLC-based controller unit and compensating transformer unit, which can realize closed-loop voltage control at the stage of voltage stabilization, and reduce the negative influence of power line voltage fluctuation upon lamp service life and visual luminance. On the basis of the illumination economizer, a GPRS-based street light remote monitoring and control system is designed with configuration software. The whole system has been operating reliably in Harbin, China for many years with an over 50% energy-saving rate, decreasing the illumination management cost and promoting the intelligent management level.
The Design of Intelligent Lighting Control System
Authors: Li Jin Qiang
Published: March 2015

The traditional lighting system has such shortcomings as wiring troubles, bad energy-saving effect, and inconvenient management and control and, with the rapid development of modern electronic technology, communication technology and computer network technology, can not meet the higher requirements on the the comfort, safety and energy saving aspects of modern buidings. The intelligent lighting control system originates from the organic combination of electronic technology, communication technology and computer network technology can effectively cantrol and manage the traditional lighting system. This paper mainly introduces the main technical aspects in intelligent lighting system including CAN bus technology application, system network design, intelligent relay, a control panel, a sensor and infrared remote control technology.
Performance Appraisal Amongst Contractors in Construction Project in Malaysia
Authors: Mat Yahya Siti Hafiza , Ismail Syuhaida
Published: March 2015

Contractors are one of the important parties in completing a construction project as they directly involved in the construction works execution. Therefore, contractors’ performance should be monitored and assessed on a regular basis to ensure the success of the project, particularly by identifying the failures and shortfalls, as well as any delays and losses that might occur due to the poor productivity of the contractors. A systematic performance appraisal is one of the endeavours in ensuring that the contractors’ performance is as per the expectation of the stakeholders, particularly the client. Hence, this paper provides a review on the contractors’ performance appraisal practices in construction industry in Malaysia. Questionnaire survey on 214 respondents from construction industries, ranging from contractors to project managers, was undertaken where the results showed that contractors’ performance appraisal in a particular construction project is very essential as it drives the project towards better improvement and ultimate success.
Comparative Study on Design of Experiment in Frequency-Based Response Surface Methodology for Damage Detection
Authors: Umar Sarehati , Bakhary Norhisham , Mohd Yassin Airil Yasreen
Published: March 2015

This paper investigates the performance of design of experiment (DOE) in response surface methodology (RSM) for vibration-based damage detection. The ability of three major types of DOE, namely central composite design (CCD), Box-Behnken (BBD) and D-optimal (Dopt) for damage detection based on modal frequency are investigated and compared. A procedure comprising three main stages—sampling, response surface (RS) modelling and model updating—are employed for damage localisation and quantification. By considering Young’s modulus and modal frequency as respective input and output, a set of samples is generated from each DOE. Full quadratic functions are considered in RS modelling while model updating is performed for damage detection. The performances of DOE are compared based on damage detectability. A numerical simply supported beam is used as case study by considering several single damage cases. The results show that CCD provides better prediction compared to other DOEs.
Return Periods of Extreme Meteorological Droughts during Monsoon in Bangladesh
Authors: Alamgir Mahiuddin , Shahid Shamsuddin , Mohsenipour Morteza , Ahmed Kamal
Published: March 2015

The Objective of the Present Study is to Characterize Extreme Droughts during Monsoon (June to September) when Rain-Fed Crops are Grown in Bangladesh. Fifty Years (1963-2012) Rainfall Data Recorded at Twenty-Nine Stations in Bangladesh is Analysed Using Standardized Precipitation Index (SPI) to Reconstruct the Historical Droughts during Monsoon with Various Severities. the Extreme Droughts Events are Identified from the Reconstructed SPI Time Series and their Distribution in Time is Recognized by Fitting Various Frequency Distribution Curves. Finally, the Best Fitted Distribution is Used to Calculate the Return Periods of Extreme Droughts. the Results Show that Extreme Droughts during Monsoon Occur once in Every 18 Years in Northwest Bangladesh. it is Expected that the Study will Help in Planning Adaptation Strategies to Mitigate the Impacts of the Droughts.
Metallic Biomaterials for Medical Implant Applications: A Review
Authors: Zaman Hainol Akbar , Sharif Safian , Idris Mohd Hasbullah , Kamarudin Anisah
Published: March 2015

Stainless steel, titanium alloys and cobalt chromium molybdenum alloys are classified under the metallic biomaterials whereby various surgical implants, prosthesis and medical devices are manufactured to replace missing body parts which may be lost through accident, trauma, disease, or congenital conditions. Among these materials, cobalt chromium molybdenum alloys are the common cobalt base alloy used for orthopedic implants due their excellence properties which include high corrosion resistance, high strength, high hardness, high creep resistance, biocompatibility and greater wear resistance. This paper summarises the various aspects and characteristic of metallic biomaterials such as stainless steel, titanium and cobalt chromium alloys for medical applications especially for orthopedic implant. These include material properties, biocompatibility, advantages and limitations for medical implants applications.
Statistical Downscaling of Rainfall in an Arid Coastal Region: A Radial Basis Function Neural Network Approach
Authors: Ahmed Kamal , Shahid Shamsuddin , Harun Sobri
Published: March 2015

Downscaling Global Circulation Model (GCM) output is important in order to understand the present climate as well as future climate changes at local scale. In this study, Radial basis function (RBF) neural network was used to downscale the mean monthly rainfall in an arid coastal region located in Baluchistan province of Pakistan. The RBF model was used to downscale monthly rainfall from National Center for environmental prediction (NCEP) reanalysis dataset at four observation stations in the area. The potential predictors were selected using principal component analysis of NCEP variables at grid points located around the study area. Power transformation method was used to remove the bias in the prediction. The results showed that the RBF model was able to establish a good relation between NCEP predictors and local rainfall. The power transformation method was also found to perform well to correct errors in prediction. It can be concluded that RBF and power transformation methods are reliable and effective methods for downscaling rainfall in an arid coastal region.
A Review on Filter-Antennas
Authors: Nyangwarimam Obadiah Ali , Hamid Mohamad Rijal , Rahim Mohamad Kamal Abd , Murad Noor Asniza
Published: March 2015

A review on the recent advancements made on filtennas are presented in this paper. RF fronts ends continue to generate a lot of research attention in communication systems due to the effect it has on the overall bit error rate and SNR. Issues such as compactness, interference and noise are addressed by embedding the bandpass filter into the antenna to form a filtenna. Designing a filtering antenna has its own challenges also. Various techniques (synthesis approach, T shaped resonator or slots.) are being used to design filtennas in order to achieve “weak coupling between the feed and the radiating structure” hence yielding better selectivity. The filter-antenna gain results compared to that of the conventional antennas show better rejection of the out of band gain. This helps reduce interference with adjacent frequency band. This paper presents a review of the techniques, challenges faced and potential research trend in filtering antennas.
On the Application of Well Stimulation Method in Improvement of Oil Recovery
Authors: Gharibi Abdoullatif , Zoveidavianpoor Mansoor , Daraei Ghadikolaei Farshad
Published: March 2015

Hydraulic Fracturing, Proppant, Acid FracturingAbstract. Increase in the price of oil and gas during recent years have motivated oil and gas companies to focus on the methods that lead to increasing in the oil and gas production. Oil well stimulation as one of these methods includes a variety of operations that performed to improve productivity of the well. The main objective of a stimulation treatment is to increase the rate at which the formation delivers hydrocarbons naturally. Today’s well stimulation method is converted to the appropriate method in the oil and gas industry to maintain or increase of well productivity. Injection of acid to partially dissolve the rock, and hydraulic fracturing to split the rock and prop it open with proppant are two common techniques for stimulating of the wells. Deciding about selection of the best method for stimulation of the wells is related to the comprehensive evaluation of capabilities of each technique and conditions which are governed on specific job intended. In this article, we are trying to present a description about well stimulation method, methods that are employed to execute well stimulation, and application of these different techniques for stimulating of wells.
Computer Aided Design and Analysis of Conical Forming Dies Subjected to Blast Load
Authors: Alipour Roozbeh , Frokhi Nejad A. , Izman S. , Tamin M.N.
Published: March 2015

In this paper design and analysis a die meant to cone explosive forming have been investigated. Since the explosive forming dies are subjected to blast loading, failure is too likely to pass. Likewise, the special geometry such as existing the several holes, sealing grooves, vacuum channel and fillets of this type of dies under explosion wave makes their analysis complicated. In the present work, the die was designed according to the final product dimension assisting a design software. In the next step the die under blast loading was analyzed using finite element method utilizing FEM software. The outcomes exhibit that the die is capable to withstand the explosion load. Besides, the trend of this paper is recommended as a routine for the designers who are going to design these types of dies.
Effects of Halloysite Nanotubes on Mechanical and Thermal Stability of Poly(Ethylene Terephthalate)/Polycarbonate Nanocomposites
Authors: Jamaludin Nurul Ain , Hassan Azman , Othman Norhayani , Jawaid Mohammad
Published: March 2015

The objective of this study is to investigate the effect of halloysite nanotubes (HNTs) loading on mechanical and thermal properties of poly(ethylene terephthalate)/polycarbonate (PET/PC) nanocomposites. Nanocomposites containing 70PET/30PC and 2-8 phr HNTs were prepared by twin screw extruder followed by injection moulding. As the percentage of HNTs increased, the flexural modulus increased. However, the flexural strength decreased with increasing HNTs content. The impact strength also decreased when HNTs increased. Thermogravimetry analysis of PET/PC/HNTs nanocomposites showed higher thermal stability at high HNTs content. However, on further addition of HNTs up to 8 phr, thermal stability of the nanocomposites decreased due to the poor dispersion of HNTs.
Study on Temperature Distribution in the Jointing Fittings for Polyethylene Natural Gas Pipes
Authors: Avrigean Eugen , Hunyadi Laszlo Jozsef
Published: March 2015

The present paper aims to approach from a theoretical and experimental point of view an important topic in terms ofoperational safety of the polyethylene pipes used in natural gas distribution.
A Study about Single-Photon Transport Controlled by Dipole-Dipole Interaction in a One-Dimensional Coupled Waveguide Cavity
Authors: Tian Wei
Published: March 2015

In this paper, by regulating the dipole-dipole interaction between atoms, we can successfully control the behavior of single-photon transport in one-dimensional waveguide cavity. Our findings indicate that the dipole-dipole interaction is equivalent to the positive detuning. Furthermore, we also found that there is a competition between dipole-dipole interaction and the atom-cavity coupling. In addition, we also studied the influences of dipole-dipole interaction on transport spectrum under extreme conditions of high and low energy.
Shape Synthesis for Skeletal Structures Using а Genetic Algorithm and Delaunay Tetrahedron Partition
Authors: Alekseytsev Anatoliy Victorovich , Kurchenko Natalia Sergeevna
Published: March 2015

Method of searching for rational shapes of skeletal structures based on the use of Delaunay tetrahedron partition algorithms with constraints and evolutionary modeling has been developed. Topology of load-bearing rod system is synthesized on specified multitude of nodes at fixed number of rods. Established structures are considered redundant and are optimized by means of excluding individual members. Optimization is performed with the modified genetic algorithm pursuant to criterion of minimum weight of structure. An example of synthesis of rectangular rod structure showing performance of suggested approach in terms of shape synthesis of trusses has been given.
Modification of Mechanisms from Database for Task Based Conceptual Design Method
Authors: Darbinyan Hrayr
Published: March 2015

In a novel approach of task based conceptual design method by proper synthesis and analyzes tools mechanism and function entities are modified, turned into and considered as extendable and squeezable ones , so systemized search of optimal structural solutions inside those entities leads the designer to satisfaction of prior given set of functions. Conceptual design generation procedure includes task simplification phase where a key function (s) based mechanical model is composed and its further development into final concept requires gradual satisfaction of remained pre given functions. Two major sources of mechanical solutions are used for function satisfaction. First is existing knowledge on mechanism available as database and the second source is self-generation of mechanisms by granting DOF action, both procedures strictly implemented in a function targeted manner. The database itself is available in different formats depending on application, tutorial or systemizing purposes. Current study discloses the approaches and methods of modification of mechanisms from database into models and formats applicable and suitable for being used in proposed task based conceptual design method.
Magnetic Field-Driven Manipulation System and its Applications in Micromixing and Microablation
Authors: Chang Ming , Gabayno Jacque Lynn , Chang Ming Yi , Lin Yu Hao , Huang Ke Wei
Published: March 2015

This study showcases two independent magnetic manipulation systems to remotely control the movement of Fe3O4 nanomaterial in microfluidic chips. One system utilizes a homogeneous rotating magnetic field to carry out magnetic stirring in 100 μm and 300 μm flow channels. The mixing results of this system revealed that adding Fe3O4 nanoparticles to the solution enhances the efficiency of the micromixer by twice as much that of a device without the nanomaterial. The second manipulation system utilizes oscillating magnetic field for rapid microablation of thrombus in a microchannel. A customizable magnetic platform using 3D-printed material is also constructed. This is proposed as a feasible low-cost and portable magnetic manipulation device that can implement both applications.
Investigation of Simulation Parameters for Cross Wedge Rolling Titanium and Bainitic Grade Steel
Authors: Blohm Thoms , Stonis Malte , Behrens B.A.
Published: March 2015

In this paper the comparison of simulations of cross wedge rolling processes with real trials using flat cross wedge tools is presented. The investigated materials are titanium and bainitic grade steel. First simulations were used to find the suitable parameter combinations for the investigated materials. Afterwards tools were manufactured with these parameters and additionally with some variations to investigate a field of parameters around this range of parameter values. The purpose of these tests is to find geometrical and process parameters with which a stable cross wedge rolling process for bainitic grade steel and titanium is possible.
Software Development for Telehealth at Blood Donation Centers
Authors: de Oliveira Drielle Caroline , Rodrigues Paulo Henrique Aparecido , Soares Rafael Palma , Amate Flavio Cezar
Published: March 2015

Firstly, taking into account the increasing number of people with internet access in Brazil, that according to IBOPE, it reached 105 million in the second quarter of 2013. On the other hand, considering the importance of increasing awareness and people's participation in blood donation process, this work aims at developing software to assist in raising blood donors and facilitate the organization of donations and donors in blood banks. A web system was developed whose function is to provide a single regional database of blood donors, providing information about blood donation, improving the start of the donation process, with grounding in national and international standards. Another important aspect is the clarification of the safety and protection of the recipient and the donor, so that the system addresses the principles of information security. The development was done with the .Net platform using C # programming language and the Service Oriented Architecture (SOA), coupled with the use of ORM Entity Framework for data persistence. According to the obtained results, it can be concluded that the system assisted in the management of data relating to blood donors in addition to promoting distance learning through the provision of information concerning the standards of knowledge and aspects of telehealth and citizenship.
A Study on Precipitation Kinetics of an Al-Cu-Li Alloy
Authors: Jung Hyun Ho , Lee Ye Rim , Min Kyung Ju , Lee Ho Sung
Published: March 2015

Aluminum-Copper-Lithium alloys are of strategic important [1] in lightweight aerospace structures due to their high specific modulus and specific strength and are under consideration for one of the potential choices for Korea Space Launch Vehicle structure. However, this is one of the most complicated alloys due to the precipitation of a large number of second phase particles. In this study, the precipitation kinetics of an Al-4.3%Cu-1.2%Li alloy was studied by differential scanning calorimetry (DSC) technique since precipitation plays an important role for hardening of this alloy. Several models including Kissinger’s, Starink’s and Chaturvedi’s were used to obtain the activation energy and precipitation kinetics.
A Study of Palm Oil-Methanol Mixing in a Stirred Tank Equipped with a Fractal Baffles
Authors: Manshoor Bukhari , Asmayou Ali , Khalid Amir , Zaman Izzuddin
Published: March 2015

Palm oil and methanol do not form a single phase mixture in transesterification process in stirred tank due to a poor surface contact between them; hence give a relatively slow mixing process of the mixing. Introduction of new baffles in the stirred tank with a fractal pattern due to the fractal shape can give a high turbulent level when a fluid flow through the fractal pattern is the new idea in optimizing the using of the fractal pattern in engineering especially in mixing industries. Hence, in the present study, a new concept of baffles with a fractal design was proposed to enhance a palm oil-methanol mixing in stirred tank. In order to achieve the objective, the simulation of palm oil-methanol mixing was carried out by using ANSYS Fluent software. The simulation was carrying out primarily in the stirred tank equipped with the fractal baffles and the levels of mixing were observed at 60, 120, 180 and 240 seconds after the beginning of introduction of methanol in the stirred tank. An effectiveness of the fractal baffles will be evaluated by determining the Coefficient of Variation (COV). The simulation results also were compared in term of homogeneity level of palm oil-methanol mixing to the normal baffles in order to determine the significant effect of the fractal baffles. Based on the simulation results, the value of COV for the mixing process in the stirred tank equipped with fractal baffles at the selected time interval are 0.066, 0.0436, 0.0326 and 0.0226 respectively. Since the values of COV between 0.01 and 0.05 are a reasonable target for many industry applications, the results for new approach of stirred tank with fractal baffles represent completely homogeneous mixing for the palm oil-methanol simulated in this study. Definitely this new approach of fractal baffles gave better results because of lower number of COV compared to the stirred tank with normal baffles.
The Effect of Elastic Deformation on the Load-Carrying Capacity of Textured Sliding Surfaces
Authors: Zhang Bo , Wang Jing Qiu , Wang Xiao Lei
Published: March 2015

In order to study the differences in load-carrying capacity of surface-textured soft materials and stiff materials, a theoretical hydrodynamic model considering elastic deformation is developed for numerical simulation analysis. Minimum oil film thickness at a certain load is computed as an index to evaluate the load-carrying capacity of textured sliding surfaces made of soft materials and stiff materials. The results show that the elastic modulus affects greatly on the load-carrying capacity. In the case of the surface texture with a dimple aspect of 0.05, textured soft materials has a higher load-carrying capacity than that of the stiff materials. In the case of the surface texture with a dimple aspect of 0.01 and only under high loads, textured stiff materials provides a better load-carrying capacity than that of the soft materials.
Analysis of Residual Stress Distribution in Anisotropic Thermo-Elastic Bimorph Systems
Authors: Dobovšek Igor
Published: March 2015

We present an analysis of residual stresses in longitudinal and transversal direction of a bimorph element induced by a change in external temperature field due to mismatch in thermal and elastic characteristics in dissimilar two-phase composite material with laminated structure. Representative Volume Element of the system is defined as a heterogeneous two-phase layered element bonded at an interface in a sense of coherent bi-layer, where each phase possesses distinct anisotropic material characteristics. We use a homogenization procedure with particular form of strain field, which satisfies compatibility equations in the bulk and at an interface. Special rule of mixtures derived from a spatial averaging principle yields explicit dependence of through-thickness residual stress on a compositional parameter defined as a volumetric fraction of one phase of the system.
Research on Pre-Load Treatment of Broadened Highway Subgrade
Authors: Zhu Bao Lin , Wang Tong , Shi Yang Zhao , Wei Dao Xin , Chen Jing
Published: March 2015

This paper determines deformation law of the new and old subgrade differential settlement by studying on subgrade deformation characteristics and control methods, mainly by using the method of numerical simulation under certain conditions. By comparing the subgrade differential settlement before and after preloading, it is confirmed that preloading treatment can be used to prevent the road structure from the effect of differential settlement during and after highway widening construction process.
Reduced Thermal Conductivity in ZrNiSn-Based Heusler Alloys
Authors: Wei Hong Yue , Huo De Xuan , Yang Wei Feng , Li Jin Wei , Zhang Yin Jing
Published: March 2015

Dual-site doped half-Heusler ZrNiSn alloys were prepared by arc melting. In order to diminish thermal conductivity of the alloys, as-casted ingots were sintered again by spark plasma sintering (SPS) technique after pulverizing and milling for several different periods of time. The electrical resistivity, thermoelectric powers and thermal conductivity of the sintered samples were measured from 4 to 350 K. A drastic reduction of thermal conductivity was obtained. The thermal conductivity decreased from about 17 to 1.5 W/K m and from 8.8 to 6.3 W/K m at 30 and 350 K, respectively. The dimensionless figure of merit of the half-Heusler alloys increased about 10%
Research on Electric Vehicle to Household Electricity Interactive Mode Considering Photovoltaic Power Generation
Authors: Liu Chang , Xia Lu , Bai De Sheng , Li Bin , Cai Liang
Published: March 2015

This template explains and demonstrates the interactive mode between electric vehicle and household electricity including photovoltaic power generation.The paper explores it from background and basic conditions, interaction analysis and control strategy, simulation and benefit calculation.
The Development Status and Trends of Air Conditioning on New Energy Vehicles
Authors: Guo Bao Sheng , Yan Guo Hai , Xiong Shu Sheng , Wang Ying Hui , Dai Ming Xin , Ye Jun
Published: March 2015

Today, new energy vehicles as low-power and clean means of transportation have been rapid development. Along with the people’s growing requirement for comfort, they should have a comfortable environment under different driving conditions. Therefore, the air conditioning system of high efficiency and energy saving is essential for new energy vehicles. This paper mainly introduces the present status and development trend of air conditioning system on new energy vehicles.
Curing Behavior for Microencapsulated Curing Agents on Epoxy Resin Systems
Authors: Wang Xi
Published: March 2015

Microcapsules containing a curing agent, 2-phenyl imidazole (2PZ), for a diglycidyl ether of bisphenol A (DGEBA) epoxy resin were prepared by a solid-in-oil-inwater emulsion solvent evaporation technique with poly (methyl methacrylate) (PMMA) as a polymeric wall. The former could take more than 3 months at room temperature, whereas the latter was cured after only a week. The values of the reaction order (a curing kinetic parameter) for DGEBA/2PZ and DGEBA/2PZ–PMMA microcapsules were quite close, and this showed that the curing reactions of the two samples proceeded conformably. The curing mechanism was investigated, and a two-step initiation mechanism was considered: the first was assigned to adduct formation, whereas the second was due to alkoxide-initiated polymerization.
Field Study on Human Thermal Adaptation in Summer of Tibetan Dwellings in Kangding, China
Authors: Song Xiao Ji , Zheng Wu Xing , He Quan , Ren Yi Mei
Published: March 2015

In order to study the human thermal adaptation in Tibetan dwellings of Kangding Tibetan Autonomous Prefecture, Sichuan Province, selected 4 dwellings in Tagong and Zhonggu village as the research objects and used the method of objective thermal environment parameters test combined with the subjective questionnaire, and got a total of 119 valid samples, the data analysis results show that indoor air temperature in this area was low, average clothing insulation was 0.75clo and it correlated with outdoor temperature was stronger than that with indoor temperature. The change rate of human thermal sensation changing along with outdoor temperature was 0.113 per temperature and it was 0.147 per temperature changing along with indoor temperature. Thermal neutral temperature was 18.5°C and preferred temperature was 20.65°C, neutral temperature was lower than preferred temperature but closer to average indoor temperature (17.36°C).