bluuebunny/crossref_metadata_2025 huggingface dataset:
Road Roughness Measurement and Analysis for Vehicle Bench Test
Authors: Yu Jun Wei , Liu Nan , Wang Bin
Published: July 2014

Road roughness, the most direct automotive input, is a kind of basic data. Its analysis and applications have important effects on vehicle performance. Several methods such as wavelet analysis, amplitude-domain analysis, frequency-domain analysis are used to analyze the road elevation series of a highway. Through some disposal of the original survey data, a series of representative data has been taken to reproduction test in a 4-poster road simulator. Both analyses and test results show that, the proposed methods can be used for the actual data process of road roughness and in the vehicle bench test.
Design and Applications of Embedded System in Video Surveillance
Authors: Yan Zhang Cheng , Fen Pang Xiao
Published: July 2014

In this paper, we select the ARM11 S3C6410 processor and embedded Linux system using the system needs to build a development environment. Studied in the embedded Linux operating system USB video capture device driver modules, collecting network video surveillance system implemented by V4L2 driver framework. Video capture program primarily through ioctl system function calls to access V4L2 driver framework. Completion of real-time video transmission via RTP / RTCP protocol. In addition, the Web server development platform porting.
Research on Attenuating Variable-Rate Reaching Sliding Mode Control Strategy for Three-Phase Current Source Inverter
Authors: Bai Jing , Lu Shi Qi , Dong Xiao , Liu Jian
Published: July 2014

A sliding-mode attenuating variable-rate reaching control strategy for three-phase current source inverter is presented. The proposed control strategy significantly improves solve the exist issues that the slow dynamic characteristic and the output waveform distortion using linear control technology in three-phase current source inverter. In order to facilitate the analysis and design of sliding mode controller, a new mathematical model of three-phase current source inverter is built, and it is further simplified through the spatial coordinate transformation. The switching surfaces and the attenuating variable-rate reaching control law are deduced. Finally, the simulation results verify the effectiveness and feasibility of the control strategy for three-phase current source inverter.
The Research of Furnace Temperature Control Technology Based on Model Free Adaptive Control System
Authors: Chen Jian , Han Xue
Published: July 2014

According to the analysis of furnace temperature control, a new control process which is based on the technique of model free adaptive control, is proposed against the defects of traditional control system. Through the analysis of the characters of MFAC and its utility for continuous and non-linear multivariable control system of glass furnace, a satisfied result indicates the good application of MFAC on temperature control of glass furnace.
The Integrated Automation Solutions Research of Zhengzhou North Station
Authors: Chang Zheng , Zhu Hai Pao , Zhang Xing Chen
Published: July 2014

This paper compares two kinds of Marshalling station integrated automation systems: SAM and CIPS, combining with the practical condition of Zhengzhou north station, analyzing from various angles such as safety and efficiency, finally choose the appropriate solution. In doing this, it will help to provide a strong support for the safe production and efficient transportation of Zhengzhou North Station.
Optimal Reserve Distribution Model for Power System with Large Scale Wind Power Integration
Authors: He Chen , Liu Ji Chun , Li Jia Yi , Wu Yun Xia , Li Xia , An Xiang Yang , Chen Hong Hui , Zheng Xiao Li
Published: July 2014

Firstly, taking into account the load forecasting error and uncertainty of wind power, the coal saving benefit and network loss of the reserve are combined into integrated coal consumption of thermal units. Then, the consistency constraints of reserve capacity are derived. On the basis of the work mentioned above, the optimal reserve distribution model for power system with large scale wind power integration is proposed. This model is used to compare the network loss, integrated coal consumption and the allocation of reserve before and after adding consistency constraints. Finally, simulation results on the IEEE-RTS24 system verify the effectiveness of the algorithm in solving reserve transfer between units, ensuring the fairness of market and providing a reference to dispatchers.
Simulation Research on the Magnetic Field of the Positioning Permanent Magnet for MEMS inside Human Body Based on Ansoft
Authors: Liu Xiu Quan , Li Yan Hong
Published: July 2014

the magnetic dipole model of the cylindrical permanent magnet was introduced. Then, based on Ansoft software, the simulation model of the cylindrical permanent magnet was established, and the influence of some parameters, such as the height, radius and magnetization direction on the magnetic induction intensity ,were studied; at the same time, under these two models the calculation was compared, the result shows the the magnetic dipole model is applied on condition that distance is nine times greater than the cylindrical permanent magnet size.
Realization of FCB Function in 350MW Subcritical Units with 35% Capacity Bypass
Authors: Wang Li , Li Gen , Zhang Ci Yun , Zhang Liang , Bi De Zhong
Published: July 2014

In this paper, a new designed FCB (Fast Cut Back) control strategy has been applied in a 350MW subcritical coal-fired unit. The FCB test carried on 350MW units under 50% load and 100% load condition is presented.The result of test shows that the units can realize the FCB function without any manual involvement and the safety of units is effectively improved.
Research on Microgrid System in the DC-Building
Authors: Yuan Ya Ning , Meng Ming
Published: July 2014

In order to achieve the objectives of energy-saving and emission reduction for modern buildings and provide high quality power supply, a DC microgrid system of thermoelectric energy comprehensive control is proposed. The system includes two subsystems of electric energy and heat energy system, and realizes electric and heat energy transformation and combination through cogeneration unit and electronic heating device. To achieve efficient use of energy, integrated management strategies is also proposed. Distributed generations are controlled by the maximum power tracking strategy, and the hybrid energy storage system uses droop control strategy to stabilize DC bus voltage. In the connection point between the grid and microgrid, the bidirectional converter uses vector decoupling control strategy with double closed loop for pulse width modulation (PWM) to solve the problem of bidirectional power flow with the grid. The simulation results indicate that the system can provide high quality, energy saving, stable power for the modern building.
User-Defined Governor Model Based on PSCAD and Analysis of Low Frequency Oscillation Mechanism
Authors: Xiao Shi Wu , Wang Cong
Published: July 2014

Based on PSCAD software, a user-defined governor model is set up. Single machine infinite bus system and four machine two regional system are taken as examples based on PSCAD and the elements’ parameters are set on the test results of a power plant in southern China. By analyzing the model of speed governing system and changing governor parameters’ value, mechanistic study leading to low frequency oscillation is studied in the paper.
Methods to Establish the Fault Tree of Substation Automation System Based on HAZOP
Authors: Han Bin Bin , Wang Yue , Guo Fu Yan
Published: July 2014

Because of it’s complexity of substation, once the control system failure will cause huge losses, according to the fault characteristics, established the HAZOP method combined with the method of fault tree model, and the substation and protection and control system as an example, the modeling process complete sample. This method can standardize and establish fault tree, provides a scientific, reasonable means to discover substation system inherent or potential risk factors.
Research for Short-Term Load Forecasting Based on Linearization Meteorological Factors
Authors: Zhang Shun Hua
Published: July 2014

With the development of economy in recent years, rapid growth of electricity demand, the cooling and heating load gets more and more big proportion of the total electricity load; the power load is influenced by meteorological factors which become more and more big. This topic will be based on short-term load forecasting in ANN (Artificial Neural Networks), conduct further research on the relationship between meteorological factors and power load, find the impact of the core meteorological factors of power load, and linear core meteorological factor model to establish the suitable for load forecasting based on ANN, make the forecasting to correctly reflect the meteorological conditions, improve the prediction accuracy of short-term load forecasting.
Identification of Lightning Strike and Short-Circuit Fault Based on Wavelet Energy Spectrum and Transient Waveform Characteristics
Authors: Gao Yan Feng , Zhu Yong Li , Yan Hong Yan , Yan Hong Wei
Published: July 2014

The transient traveling waves generated by linghting can be used to linghting location, in order to improve fault identifiaction ability of current traveling wave location device, an identification method of lightning strike and short circuit fault based wavelet energy spctrum and transient waveform characteristics was presented in this paper. Through researched the current signals generated by non-fault lightning strike, fault lightning strike and short-circuit fault on 220kV transmission line, compared of the energy distribution of different transient signals in each prequence band, realized the identification of lightning strike and short-circuit fault; for lightning identification, by waveform characteristics calculated obtaining eigenvalue to identify the non-fault and fault linghtning. PSCAD/EMTDC simulation results identicate that the proposed method is correct and effective.
Design and Simulation Analysis of the Mirror Current Source Circuit Based on Multisim10
Authors: Wang Hao , Yang Wei , Li Ben Hong , Liu Xiao Chu , He Quan Peng
Published: July 2014

The mirror current source, with the characteristics of small static resistance and dynamic resistance, has been widely used in the analog integrated circuits, commonly used as a bias circuit and active load [1]. Aiming to the problem of the output signal waveform saturation distortion, which caused by the drift effect when the temperature rises in the fixed bias circuit, this paper provides a circuit design of replacing the collector load resistance of by the mirror current source and carrying out simulation analysis by multisim10 software, compared with the theoretical calculation to verify the rationality of the design circuit.
Design of Intelligent Public Transportation Vehicle Terminal Based on S5PV210
Authors: Sun Hai Ping , Gao Zhi Gang , Chen Li Na
Published: July 2014

When the GPS signal or the wireless communication signal is weak, the vehicle will disappear in the map of the control center. In order to solve this problem, an intelligent public transportation terminal system which is cored by S5PV210 microprocessor is designed. The system uses BD2 and GPS dual-mode positioning module. Compass can provide short-message communication service. When the wireless communication signal is weak, we can use this service to communicate with the monitoring center. This design solution will make sure that the vehicle will never disappear in the map of the control center.
Research Based on Fuzzy Control of Electric Power Steering System
Authors: Cao Yan Ling , Yang Zi Bin
Published: July 2014

For electric power steering (EPS) system to the requirement of real-time and stability of the control system, a fuzzy control algorithm applied to the EPS was proposed, and composed a fuzzy controller for appling to the EPS controller. Taking into account both portability and stability of steering, testing the designed fuzzy controller on EPS experiment platform and adjusting fuzzy control parameters online to make the EPS steering feel the best. Experimental results showed that the proposed fuzzy control algorithm had good tracking performance, can meet the requirements of EPS fast and frequent start-stop and the portability and stability of steering.
Research on Traffic Behaviors and Psychological Characteristics of Pedestrians within the Comprehensive Hub
Authors: Li Bing , Li Min
Published: July 2014

Traffic terminal is a spot of high density for people’s traffic activities,the pedestrian transportation in the traffic terminal can be considered as a bunching density un-sure and nonlinear stochastic dynamics problem of interaction between each individual.pedestrian,as the primary part that composed all activities in the traffic terminal,has a significant influence on traffic behaviors and psychic properties.In this paper,we proposal a series of rationalized improvement measures to relief congestion and promote pedestrian security in the traffic terminal,by analysis on travel environment and traffic behaviors properties of pedestrian and deeply studying their traffic psychic properties
Design and Implementation of USB Coordinator Based on Z-Stack
Authors: Jiang Zhi Cheng , Lee Shu Dan , Chen Jin Ying , Qin Zhang Jian , Yu Ren Fei
Published: July 2014

Ecological agriculture is increasingly relying on mobile technologies to monitor the growth of plants, however, the traditional management efficiency is low and waste resources. So, a USB coordinator based on ZigBee-Stack is designed. ZigBee is a low rate, low power consumption wireless communication technology, which can be commonly used in Wireless Sensor Network (WSN). WSN is composed of hundreds sensor nodes, all of the information from these nodes will be sent to the coordinator, so the coordinator undertakes the task to collect and process data information, and also as the interface of the network with users. The design of the coordinator is based on CC2530 chip, and RFX2401C chip is superposed on it. A software was compiled to test the data transmission distance. The results show that the distance was increased by 40-60 meters and RFX2401C chip uses only two pins of CC2530 chip. So the improved coordinator is more cost-savings and efficient.
Electromagnetic Coupling Reduction in Microstrip Antenna Arrays Using Single-Negative Electric Waveguided Metamaterials
Authors: Hu Li Zhong , Wang Guang Ming , Wu Guo Cheng
Published: July 2014

A single-negative electric waveguided metamaterial (WG-MTM) is proposed using folded complementary split single ring resonator (FCSSRR) to reduce mutual coupling in antenna arrays for MIMO applications. The WG-MTM is investigated numerically, which proved to exhibit electric resonance and band-gap property. Two antenna arrays have been designed, fabricated and measured. By inserting the electric negative metamaterial, a mutual coupling reduction of 9.2dB has been achieved with an edge-to-edge distance less than 0.17 (where is the operating wavelength). Moreover, the metamaterial loaded antenna has better far-field radiation patterns compared with the reference antenna. Thus, this novel structure not only has good coupling reduction ability, but also can optimize the performances of the antennas.
Equivalent Electromagnetic Properties of Composite Media
Authors: Pang Xiao Fen
Published: July 2014

This paper selects the dielectric properties of materials science, soil science, geophysics and other areas of computing model, comparative analysis of the applicability of various computational models. Mainly in the particle dispersion mixing model based validated multi-group model were compared and analyzed to establish the feasibility of centralized computing model. And the model is modified, and the results show modified model of the original model has greatly improved results.
Development of Computer-Aided Manufacturing System for a Jewelry-Making CNC Machine
Authors: Miao Ya , He Kai , Fang Hai Tao , Zhou Zhi Min , Du Ru Xu
Published: July 2014

Abstract. This paper designs a CAM system for a jewelry-making CNC machine. The CAM system not only provides a human-computer interface for setting machining parameters, but also can generate special NC programs automatically and realize the simulation for the machining process. In addition, the paper gives an efficient application for machining an ellipsoidal gold bead. The basic design of the jewelry-making CAM system and the experimental results are presented.
An Evolving GPSR Protocol in Urban Roundabout Scenario
Authors: Yu Hai Yang , Yang Hua Min , Di Xiao Qiang , Qu Liang Dong
Published: July 2014

According to the research of VANET routing protocol, an improved protocol SN-GPSR has been proposed. It is based on the sensitive nodes. The nodes select routing through a special position and steady speed under GPSR protocol. In a crossroads scenario, we designed a vehicular mobility model and simulated it using NS-2. By analyzing the results, the network performance parameters of SN-GPSR have improved above the GPSR, such as delay, packet loss and others.
Complex Network Evolution Model Based on Node Attraction
Authors: Sun Rui
Published: July 2014

This paper studied the evolution law of the real-world networks, and then proposed a complex network model based on node attraction with tunable parameters in order to solve the problems existing in BA model and the original node attraction model. The model considered the effects of preferential attachments by the changes of degree and node attraction in the evolution process of networks. Theory research and simulation analysis show that we can more flexible adjust the evolution process of network through adjusting model parameters, therefore make it more accord with the network topology and statistical characteristics of real-world networks.
QoS Routing Protocol Based on Resource Optimization for Aerospace Networks
Authors: Wu Wei Qiang , Luo Bing Ni , Chen Pei Pei , Zhang Qin Yu
Published: July 2014

To guarantee the QoS of the various traffics and take good advantage of the network resource, the QoS routing protocol based on resource optimization is proposed. By the network state information dynamic update and the QoS routing optimization model design, the QoS routing protocol can provide the optimal path for real-time traffic, broadband traffic and best effort traffic in time with low control message cost. Simulation shown that, compared to the traditional shortest path routing, the QoS routing can satisfy the demand of traffics and can improve the network performance.
Rumor Propagation Model for Complex Network with Non-Uniform Propagation Rates
Authors: Sun Rui , Luo Wan Bo
Published: July 2014

Considering propagation characteristics and affecting factors of rumor in real-world complex networks, this paper described different propagation rates of different nodes by introducing the rumor acceptability function. Based on mean-field theory, this paper presented a rumor propagation model with non-uniform propagation rate, and then simulated the behaviour of rumor propagation on scale-free network and calculated the propagation thresholds by corresponding dynamics equation. Theoretical analysis and simulation results show that nodes with different rumor acceptability could lead to slowing the spread of rumors, make positive propagation threshold arise, and effectively contain the outbreak and reduce the risk of rumors.
A New Method for High Speed CAN Protocol Conversion Circuit
Authors: Li Qi , Liu Yan Fei , Luo Da Cheng , Yang Jing Jing
Published: July 2014

Due to high correspondence speed, great real-time performance and good expansibility, CAN bus has been used widely in aerospace, large-scale equipments and other fields these years .This paper introduces a kind of CAN Bus Test Instrument based on PXI bus and FPGA, which is used to test and monitor the CAN bus equipment. The result of test shows that this kind of test instrument has great advantages in reliability, stability and extensibility.
A NHPP-Based Reliability Model of Wireless Sensor Networks
Authors: Zhao Bo , Yang Jian Feng , Zhao Ming , Li Qi , Liu Yan
Published: July 2014

As the Wireless Sensor Networks (WSNs) are widely applied to various fields recent years, the quality of WSN has been increasingly concerned. Since reliability is the most important factor of quality, how to evaluate reliability of WSN through failure counting is our main subject. In this paper, we try to utilize NHPP theorem in the failure process of WSN and propose a reliability model based on NHPP. And also, the model validation is conducted by simulation.
Implementation of USB in Embedded Systems Based on ARM Microprocessor
Authors: Li Xin Li
Published: July 2014

S3C4510B is a cost-effective 16/32 bit RISC microcontroller based on Ethernet application system, and ISP1161 is a chip which is designed to implement USB protocol in an embedded system. Here, we design and implement embedded systems USB with ISP1161 chip based on ARM microprocessor S3C4510B. This paper describes the basic working principle of ISP1161 chip and hardware design of the system, and presents the software implementation process of USB in embedded systems.
A Discussion on the Electromagnetic Compatibility of Data Center
Authors: Zhao Xiao E
Published: July 2014

Electromagnetic compatibility refers to the “coexistence of each electric equipment and system without causing the unexpected performance degradation in the condition of limited space, time and spectrum resources.” As the rapid development of electrical & electronic technology and the broad application of electromagnetic equipment and system, the radio technologies like communication and broadcast have been widely applied by people. They gradually discovered the severe impact of the electromagnetic equipment on the related environment during their application of such appliances, and also further focus on the contradiction that appears between equipment, conflicts between equipment and system, incompatibility between systems, clash between equipment and system, and human and natural environment.
Modeling Software Architecture Evolution for Electronic Commerce System Based on Graph Representation
Authors: Jiang Huo Wen , Kuang Gui Juan
Published: July 2014

With the rapid development of mobil internent and internet of things,most of electronic commerce systems need to be improved.Software architecture evolution for electronic commerce system provides an important technology measure for its improvement work. This paper try to model software architecture evolution of e-commerce based on graph representation.Firstly the paper apply a graph to represent SA of a e-commerce system,and give its formulazation description.Then establish some basic evolution rules for software architecture evolution of electronic commerce system on the basis of defining graph transformation rule,software architecture evolution operations for electronic commerce can be carryed out according to these evolution rules.Finally through an evolution case, the sophisticated process of software architecture evolution for the electronic commerce system is described.This research work can help to upgrade the electronic commerce. system.
IOT Application Research between Digital Publishing and Traditional Publishing
Authors: Chen Zhi Wen
Published: July 2014

Internet of Things (IOT) used in the field of traditional publishing and digital publishing is studied, which not only can enhance the information capability of publishing industry, but also protect the security of the publication. Comparison from RFID tag of traditional publishing, digital publication tag based on IOT has more advantages in position, visibility, environmental impact and cost etc.. Application issues in the publishing field are analyzed and suggestions are discussed from standard to technology, which includes standard system construction, system security, RFID tag cost of traditional publishing, digital rights and industry research of watermark technology for digital publishing.
Orthosis for Surgery Procedures
Authors: Torres Mauricio Plaza , Aperador William
Published: July 2014

Prolonged standing at work has been linked to health problems including foot, leg and back pain, varicose veins, circulatory problems, including a possible increased stroke risk. [1]. There are many other potentially very serious health concerns. Worsening of existing coronary heart disease as well as varicose veins and chronic venous insufficiency has been associated with prolonged standing. Pain in the lower limbs and feet are also associated. [2] Studies suggest back pain associated with long surgery is about twice as common in those who stand compared to those medical staff who usually work sitting, even after controlling for age and lifting weights. The main reason is the back position must to be inclinate in the most part of the surgery.
The design of orthesis for the lower extremity with chest support represents an alternative to medical staff health problems who standing for long periods on surgical procedure. The surgical orthesis system proposal in this research is positioned on middle side of the leg and is designed such that support the body weight during the surgical procedure. The system can be used for release pressure on ankle, knee and hip joints.
Integration of Crashworthiness Aspects into Preliminary Aircraft Design
Authors: Schwinn Dominik B.
Published: July 2014

Crashworthiness proof is a certification requirement by aviation authorities for new aircraft types. The objective of static design is a sufficiently stiff and strong structure to carry bending and torsion during flight and ground maneuvers. High stiffness, however, is critical for good crashworthiness behavior. Therefore, crashworthiness investigations should be included at early design stages of the overall aircraft design process. This paper introduces the crash analysis tool AC-CRASH and shows an approach of integrating it into the preliminary design phase.
Exit Geometry Effect on Jet Mixing
Authors: Mitruka Jatin , Singh Pranav Kumar , Rathakrishnan E.
Published: July 2014

An elliptical nozzle of 3:1 aspect ratio (AR) issuing a Mach 1.5 jet has been used to investigate its mixing promoting efficiency under over-expanded and under-expanded conditions at the nozzle exit. Azimuthal asymmetry of the elliptical shape is interpreted as a benefit to the mixing process, which is significantly enhanced in comparison to an equivalent circular jet under identical conditions. The elliptical jet decays faster than its circular counterpart throughout the jet field. It is found that continuous variation in the size of the mixing promoting vortices shed from the nozzle exit, as a result of its azimuthal asymmetry, is responsible for faster decay of elliptical jet. The visualization of elliptic jet corroborates the fact that the waves prevailing in the elliptical jet are significantly weaker than those in the circular jet.
Modeling of a Wind Turbine Blade Coupled with Aerodynamic Loads in Passive Damping Control
Authors: Guo Da Wei , Xie Zheng Chao , Zhang Long
Published: July 2014

For a wind energy generator, the most significant factor which decreases the working life of it is the vibration from the rotating turbine blades under wind. In this paper, we do modeling and simulating in the constrained layer damping (CLD) approach, which is called passive control. Here, we use software PRO/ENGINEER to design and model a wind turbine blade before using COMSOL to simulate the dynamic motion of the wind turbine blade and its interaction with aerodynamic force of wind in finite element method. Some different models are built, the original turbine blade and the turbine blade with damping patches on different location and quantity. Then, according to the simulation results, we compare the effects of passive damping control in defferent patches locations and quantities under different wind speed. This research can provide us foundation and comparision with our future study which is related to the piezoelectric layer damping (PLD).
The Research of Five-Axis NC High Efficient Machining Technology for UAV Integral Impeller
Authors: Zhao Hui , Cai Yu Jun , Li Guo He
Published: July 2014

In this paper, a very detailed process analysis for UAV integral impeller was made. According to the specific processing requirements, the appropriate CNC machine, blank and cutting tools have been choosing. In the rough machining process, various machining strategies have been used for comparing and analyzing, finally a more efficient roughing method with the accurate machining parameters will be obtained. At the same time the machining method have been improved and the processing parameters also have been determined in the semi-finishing process. Through the simulation processing in VERICUT, the possibility of the existence of interference which is usually occurred in the actual processing can be ruled out and the program optimization will be finished in the meantime. Finally, using intelligent three-coordinate measuring machine the consequence will be verified and inspected in the actual machining process.
A New Method of Stress Linearization for Design by Analysis in Pressure Vessel Design
Authors: Li Hong Jun , Ding Qiang , Huang Xun
Published: July 2014

Stress linearization is used to define constant and linear through-thickness FEA (Finite Element Analysis) stress distributions that are used in place of membrane and membrane plus bending stress distributions in pressure vessel Design by Analysis. In this paper, stress linearization procedures are reviewed with reference to the ASME Boiler & Pressure Vessel Code Section VIII Division 2 and EN13445. The basis of the linearization procedure is stated and a new method of stress linearization considering selected stress tensors for linearization is proposed.
Effect of Excitation Waveforms on Biomimetic Cilia-Based Micromixing
Authors: Kongthon Jiradech
Published: July 2014

This article presents the effect of excitation waveforms on the rate of micromixing evaluated using biomimetic cilia-based microfluidic devices (soft cantilever-type, vibrating devices that are excited by the oscillations of the piezoactuator with different trajectories). The main contribution of this article is to experimentally evaluate the mixing excited by different waveforms and to report that (i) the mixing time is significantly decreased through employing the cilia when compared to the case without employing the cilia; (ii) the mixing time in case of employing the cilia is additionally decreased through the application of the symmetric triangular waveform with sharper turnarounds when compared to the case of the symmetric sinusoidal waveform (with smoother turnarounds); (iii) furthermore, the mixing time in case of employing the cilia is reduced further through applying asymmetric excitation waveforms with greater asymmetry when compared to the case of applying asymmetric excitation waveforms with less asymmetry.
Numerical Prediction of the Magneto Plasma Dynamic Thrusters’ Performance
Authors: Tahsini Amir Mahdi
Published: July 2014

The performance of the magnetoplasmadynamic thruster is predicted using numerical simulation. The thruster mode is self-induced magnetic field with cylindrical electrodes. The dependence of the thrust level, specific impulse, and the mass flow rate in different total electric currents is investigated. The AUSM+ scheme is utilized to develop a numerical procedure and the accurate method is used to simulate the propellant injection rate. Besides the performance curves prediction, the results show the importance of the effect of inlet modeling on the thruster’s actual specific impulse.
Characterizing and Modeling Mechanical Properties of Circulating Tumor Cells by One-Way Fluid Structure Interaction Simulation
Authors: Gao Feng , Li Gang , Nagasaka Takanori , Hayase Masanori , Okada Hiroshi
Published: July 2014

The objective is to study on inverse analysis for the mechanical properties of circulating tumor cells and estimate the mechanical properties. For the adsorbed cells in the micro flow path, experimental image of cell deformation under flow was obtained. The strain is defined based on the image and it is shown for the relationship with flow rate. The fluid analysis was performed to compute the stress acting on the spheres in the micro flow path. The amount of deformation of the cells was examined with changes in the Young's modulus. It consists combining experimental results with a numerical finite element model in order to find out the mechanical properties of circulating tumor cells. The procedure proposed may be also applicable in estimating other physical and mechanical properties of cells.
Ground-Based Study on Distribution of Fire Parameters and Installation of Fire Detectors in Space-Confined Microgravity
Authors: Wang Xiao Wei , Hu Hai Bing , Qin Jun , Zhang Yong Ming
Published: July 2014

The manned spacecraft is a typically confined space in microgravity and it suffers severe fire risks. This paper studies on the distribution of the fire parameters in space-confined microgravity to find a more rational way to install the fire detectors. The experiments are carried out in the ground simulation experiment platform for fire based on the International Space Station. Based on the functional simulation principle, this paper maintainsGr(Grashof number) and increasesRe(Reynolds number) to simulate microgravity environment in such a full-scale platform. The results show that Fire Detector 5 on the center of the side wall and Fire Detector 7 on the corner of the ceiling are the best installing locations for smoke detection. And, temperature detection is not appropriate in manned spacecraft. Namely, the way to install the fire detectors in manned spacecraft should be different from that in normal gravity.
An Epoxy-Based Micro-Structure Surface for Improving Anti-Reflection Efficiency of a Solar Cell Module
Authors: Tsai Ming Jong , Chen S.Y. , Chen J.W. , Huang R.B. , Lin T.L.
Published: July 2014

This paper proposes an epoxy-based anti-reflective micron structure layer for solar cell modules. A Solidworks software is used to design the micro-structure layers with different size and shapes (inverted pyramid and micro-lens). Then, An optical simulation software, Tracepro, is used to simulate the anti-reflection efficiency under the standard lighting source of AM1.5G. The difference between the flat layer and micro-structured layer has been analyzed to obtain the best micro-structure layer for solar cell modules. From the simulated results, the inverted pyramid textured layer that each pyramid’s width is 10μm and height is 5μm can improve the flux increment rate up to 13% compared with the flat layer at normal incidence. However, the best efficiency for micro-lens structure layer increases about 10% with radius of 25μm and height of 18.75μm and 25μm at 15o incidence. In addition, the thinner the Epoxy layer is, the better the anti-reflection efficiency is. Therefore, the proposed Epoxy-based micro-structure can improve the solar module for obtaining higher efficiency and best qualities.
Efficiency Enhancement of Organic Solar Cells with Process-Optimized Silver Nanoprisms
Authors: Zhang Qiang , Qin Wen Jing , Cao Huan Qi , Yang Li Ying , Yin Shou Gen
Published: July 2014

We fabricated silver nanoprisms (AgNPs) on ITO by immersing ITO substrates in AgNPs solution for a series of immersion times. The amount of adsorbed AgNPs increased with immersion time. The AgNPs showed plasmonic absorption in the range of 400 – 600 nm and were used in organic solar cells (OSCs). The device performance was the best when the immersion time was 30 min, corresponding to AgNPs coverage of 68%. Under this condition, the device showed short-circuit current density (JSC) of 10.10 mA cm-2(18% improved), and power conversion efficiency (PCE) of 3.88% (23% improved).
The Viability of Composite Membrane in Treating Produced Water from Oil and Gas Field in Malaysia
Authors: Shahruddin Munawar Zaman , Adnan Azizal , Tengku Mohd Tengku Amran , Alias Nur Hashimah , Ghazali Nurul Aimi
Published: July 2014

As the oil and gas industry grows rapidly worldwide over the years, the production of produced water is also increasing. Million barrels of water are produced each day worldwide. This situation has become a major problem and a to the environment and ecosystem. Produced water contains many constituents such as dispersed oil, metals and chemicals that have a high toxicity and very harmful to the marine life. Therefore, it must be treated prior disposal to the environment or reinjection into the well and formation. There are many methods of treatments such as liquid-liquid hydrocyclone, floatation technology and membrane technology. Membrane technology is quite a new technology for the treatment of produced water in oil and gas industry. This paper is focused on the viability of using composite membranes which are Polysulfone (PSU), Polysulfone-bentonite (PSU-bentonite), PSU-PVP (Polysulfone-Poly vinyl pyrrolidone) and Polysulfone-Poly vinyl pyrrolidone-bentonite (PSU-PVP-bentonite) for the treatment of produced water. The objectives of this study are; 1) to characterize the produced water, 2) to prepare and cast the composite membrane and 3) to investigate the membrane performance in treating the produced water. The performance of the composite membrane were tested by using the produced water as wastewater feed and the best composite membrane is determined by the membrane performance. In the membrane preparation process, a method have been used namely phase inversion method. This research found that technically composite membrane have a good potential to be used in treating produced water from Malaysian oil and gas field. Thus, further technical and economic study on this treatment method is suggested for industrial scale application.
Development of a Radioisotope Heated Hollow Cathode
Authors: Mboyi Kalomba , Ren Jun Xue , Liu Yu
Published: July 2014

A new type of hollow cathode using a radioisotope heat source instead of a conventional sheathed heater was introduced and it achieved thermionic emission performances similar to the ones of conventional hollow cathodes. Strontium-90, Plutonium-238 and Curium-244 were chosen as radioisotope heat sources and a thermal reductive layer was also used to obtain precise thermionic emissions. A new system design methodology called the Self-Sufficiency Principle was introduced and was applied by powering the keeper electrode with the radioisotope decay heat using a radioisotope thermoelectric generator (RTG). The heater supply of the hollow cathode power configuration was replaced with a RTG supply and the mode of operation of the device was modified because radioisotope heat sources cannot be switched off. This hollow cathode was then benchmarked against two ion thruster configurations and a maximal overall power saving of 3% was achieved. Its advantages are its power saving capability and scalability but it can however be voluminous, heavy and potentially hazardous. Further research in this field ought to explore the range of applications of this new power-free electron emission technology.
Collector Design of Tracking System Based on PLC
Authors: Lu Yan Qing , Hu En Dian , Yuan Zhong Xian
Published: July 2014

This article describes the Parabolic trough solar collector design of single-axis tracking system based on PLC, Siemens S7-300 as a controller, using a complex mathematical model, based on the special climate of Western Region, select the single-axis design process, greatly reduced cost, collectors need only be completed that automatically tracks the sun azimuth. Feedback device selection angle sensor, light intensity sensor and sun sensor, strain two conditions that cloudy and sunny, which greatly improves the efficiency of the collector, the better to achieve real-time tracking grasp the situation.
Development of the Multimethod Genetic Algorithm for the Strip Packing Problem
Authors: Chekanin Vladislav A. , Chekanin Alexander V.
Published: July 2014

The actual in industry strip packing problem which is NP-hard in strong sense is considered in paper. To the strip packing problem comes down solution of a large number of different practical problems, including problems in logistics, scheduling and planning. The new heuristics intended to pack a given set of rectangular two-dimensional objects in order to minimize of the total length of the filled part of container with an infinity length and fixed width are offered. The proposed multimethod genetic algorithm is investigated on well-known standard benchmarks of two-dimensional strip packing problems.
Automatic Discovery Approach of Digital Image Topic
Authors: Jin Cong , Jin Shu Wei
Published: July 2014

A topic discovery approach of the image has been proposed. First, the training images are segmented into some blocks. After clustering blocks, we obtained class set generated by cluster centers, and extracted all nouns from text annotation of each training image to obtain a keyword set. Secondly, the un-label testing image is also segmented into some blocks as same as training images, we calculated the correlation between the block and keyword, and the keyword set for each block may be obtained. Finally, the number of the same keyword appearing in the each block is calculated, we let the keywords with maximum to appear times be as the topics of the image. The experimental results confirm that proposed approach for the image is effectiveness and has good performance.
An Effective System Identification Method of Small-Scale Unmanned Helicopter
Authors: Liu Yu Zhu , Hu Fei
Published: July 2014

In order to control an unmanned helicopter accurately and reliably, it is necessary to have a precise mathematical model of its dynamics. This paper presents a new timedomain identification method and process for full state space model of small-scale unmanned helicopters. The identification method is called ISAcwPEM (Improved Simulated Annealing combined with Prediction Error Method), which is not sensitive to initial point selection and doesn’t require frequency-sweeping inputs. Firstly, the primary parameters to be identified are selected by model sensitivity analysis. After that, the improved simulated annealing algorithm runs in a distributed computing platform to figure out a 13-order state space model of the SJTU T-REX700E small-scale unmanned helicopter (consisting of a cruise modal and a hover modal). Then the iterative Prediction Error Method (PEM) is used to optimize the model. In addition, the time-delay term and the trim term are estimated and added to the model. Finally, the effectiveness of the identification method is well validated by real outdoor flight experimental results.
New Type of Takagi-Sugeno Fuzzy Inference System as Universal Approximator
Authors: Anikin lgor , Zinoviev lgor
Published: July 2014

A new type of fuzzy inference systems (FIS) is presenting. It is based on Takagi-Sugeno fuzzy inference system. New FIS has been called the enhanced fuzzy regression (EFR). In opposition to the Takagi-Sugeno, new type of FIS has fuzzy coefficients in right parts of the fuzzy rules. Fuzzy approximation theorem has been proved for the EFR. We have suggested learning procedure for EFR inference system.
Application of Remote Sensing Data on Dynamic Monitoring of Coastline in the Yellow River Delta
Authors: Chang Jun , Li Tao , Liu Wei
Published: July 2014

As one of the efficient means of data acquisition, remote sensing data play an important role in many areas of life through the development of technology and the improvement of spatial resolution. In this paper, the application of remote sensing data on dynamic monitoring of coastline in the Yellow River Delta was analyzed. The results indicate that the using of remote sensing data was more scientific and efficient than the traditional methods, and the analysis results can provide a theoretical basis for the ecological protection in the Yellow River Delta.
Use Improved Gradient Descent in Irregular Boundary Conditions in Molecular Dynamics
Authors: Su Fang , Tissera Shirosh , Lukas Tomas , Munjiza Ante
Published: July 2014

An improvement is made on the adaptive step size of the gradient Descent (GD). We propose that the improved GD can be used in Molecular Dynamics (MD) to determine the shortest distance between an irregular curve (described in high-order equation) and a point outside the curve, that we show that it can solve the problem with affordable computational power and high accuracy (an average of 1% error in around 30 iterations).
Prediction of Aeroacoustic and Control over a Cavity by Delayed Detached Eddy Simulation
Authors: Liu Yu , Tong Ming Bo
Published: July 2014

In the present study CFD simulation with delayed detached eddy simulation (DDES) are performed to investigate an open cavity at Mach 0.85. Two cavity configurations, clean cavity and cavity with a leading-edge saw tooth spoiler, are modeled. The results obtained from clean cavity prediction are compared with experimental sound pressure level (SPL) data from QinetiQ, UK. Furthermore, comparisons are made with the predicted SPL between the two configurations. The main focuses of this investigation are to obtain a further understanding of the cavity aeroacoustics and test the noise suppression effect by a saw tooth spoiler.
Attitude Control of a Quadrocopter Using Adaptive Control Technique
Authors: Ibarra R. , Florida S. , Rodríguez W. , Romero G. , Lara D. , Pérez I.
Published: July 2014

This paper presents an application of the MRAC (Model Reference Adaptive Control) techniques to achieve the attitude stabilization in an unmanned aerial vehicle (UAV) type quadrotor when there exists disturbances and/or uncertainties in the parameters due to changes in the payload, variations in battery voltage during flight, etc. This is achieved by performing an online adaptation of the controller parameters, which are obtained by showing the stability property of the closed loop control system using Lyapunov theory. Simulation results using Matlab-Simulink platform are presented to demonstrate the convergence of the controller parameters.
Base on Real Time Temperature Monitoring and Sprinkler Cooling Control to Achieve Energy Conservation of Air-Conditioning Systems
Authors: Hung San Shan , Chang Hsing Cheng , Lee Huan Hao
Published: July 2014

If the air conditioning usage situation cannot be effectively improved, the energy consumption process will be accelerated, exacerbating the energy crisis. Despite scientists’ efforts to find alternative energy sources to solve the energy crisis, the most immediate solution is to reduce energy consumption.In this study, the energy-conservation system was designed by setting up several temperature sensors, transfer modules, and water sprinklers on rooftops and external walls that were exposed to the most sunlight; the temperature sensor modules regularly measured the roof temperature and used radio frequency (RF) technology to transfer the temperature data to the indoor receiving set. The measured temperatures were then compared with the indoor temperatures, after which the monitor program analysed and sent commands to control and activate the water sprinkler system. This allowed timely sprinkling using the proper water amount to lower the surface temperature of the roofs and external walls, which also slightly reduces the indoor temperature, achieving energy-conservation objective. Actual examples were then used to investigate the energy-saving effectiveness of the proposed system.
Numerical Control System Research and Development of Acrobatic Stage
Authors: Cao Peng Xian , Cui Hong Bin , Liu Xin Yu , Yu Xue Song , Liu Chang Long
Published: July 2014

With the continuous development of CNC technology, its application is more and more extensive. In recent years, the application of CNC technology in the area of stage also made great achievements. This paper detailed a scientific and reasonable scheme of acrobatic stage machinery and its control part, using CNC technology in acrobatic stage, through the corresponding algorithm and software realizing the operation and control of any trajectory in 3D space, taking advantage of intelligent editing function of screen running track, and compared with the traditional acrobatic stage , it gets more flexible, stronger strain capacity.