bluuebunny/crossref_metadata_2025 huggingface dataset:
Numerical Simulation on the Performance of Vertical Jet Flowmeter of Natural Gas
Authors: Wang Xiao Hua , Xiao Zhe , Zhang Kai
Published: July 2014

In this paper, SimpleC algorithm and Realizable turbulence model are applied to simulate the detailed flow field of oscillator, which is the key component of the vertical drainage jet flowmeter. Based on analyzing the pressure fluctuation of fluid in the feedback channels of the oscillator at different flowrates, the results indicate that there is an obviously linear relationship between velocity and oscillation frequency of static pressure in the vertical feedback channels within a certain range of flowrate. The achievements can be helpful to the optimization the design of vertical drainage jet flowmeter.
FEM-Based Topological Optimization on the Spindle Box of Heavy Duty CNC Lathe Machine
Authors: Gao Chang Shui , Liu Zhuang , Zhao Jian She , Zhang Le Ping , Zhao Yi Shun
Published: July 2014

A topological optimization on the spindle box of a heavy duty lathe was studied. The objective of the work was to seek optimum material distribution and lighter mass of the spindle box, while maintain its original stiffness, strength and natural frequencies. Firstly, static and modal analyses were carried out. Then, the topological optimization was conducted through constraints of spindle hole’s displacement and lower-order natural frequencies, with minimized material volume as objective. Finally, a spindle box with optimized structure was obtained.
Fault Diagnosis of Rolling Bearing on the Basis of Wavelet Neural Network
Authors: Wu Song Lin , Liu Jian Xin , Li Li
Published: July 2014

In this paper, the feature vector of the roller bearing signals are extracted on the basis of wavelet analysis and a fault diagnosis experiment is carried through wavelet neural network in detail. The method and the theory of fault diagnosis based on BP neural network and the radial basis function neural network are studied and the results of diagnosis based on relax-type Neural-Networks and close-type Neural-Networks are compared.
A Study of TMF Characteristics of Ni-Base Superalloy IN738LC
Authors: Lee Dong Keun , Lee Jeong Min , Koo Jae Mean , Seok Chang Sung , Kim Jae Won
Published: July 2014

A gas turbine blade operates under severe conditions including high temperature, high speed rotation, and frequent starts and shutdowns. Under such operating conditions, a blade is exposed to a thermo mechanical fatigue environment. These conditions shorten the life of the turbine parts and reduce the reliability of the gas turbine. Therefore, research on the characteristics of blade material is necessary. In this study, thermo-mechanical fatigue (TMF) tests were conducted for IN738LC, which is base a material for turbine blades. Tests were conducted under both the IP (in-phase) and OP (out of-phase) conditions, and tests results were compared in terms of fatigue life. After obtaining the ε-N curves, additional TMF tests were conducted according to variations in fatigue life. The purpose of the TMF test is to observe the change in mechanical properties of materials damaged during TMF and how these relate to fatigue life. For this purpose, an indentation test was conducted and the relationship between hardness and fatigue life were obtained.
Iterative Taguchi Analysis: Optimizing the Grain Boundary Carbide in Hadfield Steel
Authors: Hosseini Shabnam , Limooei Mohammad Bagher
Published: July 2014

Manganese steel (Hadfield) is one of the important alloys in industry due to its special properties. High work hardening ability with appropriate toughness and ductility are the properties that caused this alloy to be used in wear resistance parts and in high strength condition. Heat treatment is the main process through which the desired mechanical properties and microstructures are obtained in Hadfield steel. Iterations of Taguchi designed experiments and analysis were used to determine optimum heat treatment for minimizing grain boundary carbide content in Hadfield steel. Experimental variable chosen for this study included austenitizing temperature and time and rate of quenching. The austenitizing temperature and the cooling rate by changing in quenched solution were seen to have the greatest influence on carbide content in Hadfield steel.
The Design of Sustainability Assessment Data Warehouse for Shanghai Airport
Authors: Yuan Guang Hui , Fan Chong Jun , Yang Yun Peng , Liu Wu Jun , Ran Xiang Lai
Published: July 2014

This article explored the design and implementation problems of Sustainability Assessment Data Warehouse for Shanghai Airport. According to the characteristics of Shanghai airport, the airport data collection platform layer and six theme databases were designed in this paper. This paper also designed the operator assessment models and the user evaluation models, which strong guaranteed and supported the validity of the evaluation of sustainable development at the airport.
Remove Mesh Self-Intersections Based on Light Projection Algorithm
Authors: Huang Zhi Wei , Dai Ning , Guo Chang Ye , Wu Chang You , Yin Wei , Tang Yue Hong
Published: July 2014

Offset in computer aided design and manufacturing (CAD/CAM) is a kind of important geometric operation, such as rapid prototyping technology, NC machining, the collision detection, etc. When offset distancedis greater than the minimum radius of curvature on the original surface, or part of the distance between parts of curved surface pieces, it causes self-intersection. Self-intersection makes distance between two models smaller than the offset distancer, leading to offset model local intersection or distortion. This paper proposes a method based on light projection algorithm to remove self-intersections and achieve good results. Firstly, set point coordinates on the original model as the light source locations and build the projection light according to adjacent plane vector weighted sum.Secondly, the projection light passes through the offset model. We extract the triangles on the outermost layer and load it into a list. Finally it is essential to filter the intersection points and construct triangle mesh. We use different discrete data models to do experiments and prove the validity and practicability of the algorithm.
Tuning Method of Fractional Order Controllers for Vibration Suppression in Smart Structures
Authors: Muresan Cristina I. , Prodan Ovidiu , Folea Silviu
Published: July 2014

Vibration suppression is a major problem in various domains, with applications ranging from medical devices to aerospace engineering. Several methods for suppressing vibrations have been proposed, but very few address this issue from the fractional calculus perspective. The emerging new fractional order controllers have the ability to meet more design specifications at the same time, behaving robustly against modeling uncertainties, external disturbances, etc. In this paper, a new tuning method for fractional order PDµcontroller is proposed in which the design directly addresses the problem of suppressing resonance frequency vibrations. The case study consists in an unloaded smart beam. The simulation results, considering an additional situation of the loaded smart beam, show that the proposed method is simple and leads to a robust closed loop behavior.
Some Kinds of Pseudo-Intelligent Control Systems for Selecting Trajectories of Flight Vehicles
Authors: Proletarsky A.V. , Neusipin K.A. , Shen Kai
Published: July 2014

In order to effectively solve the problem of selection trajectories of flight vehicles, some pseudo-intelligent systems with functional structures were established. Moreover, systemogenesis of pseudo-intelligent control systems of flight vehicles was illustrated. Based upon the theory of P.K. Anoxin functional systems and self-organization algorithms, the perspective pseudo-intelligent control systems for all stages of systemogenesis can make a reality of the whole-life control of flight vehicles.
Optimal Combined Forecasting Method for Foreign Workers in Chiangmai
Authors: Rajchakit Manlika
Published: July 2014

This paper is concerned with the performance of combination method for forecasting the foreign workers in Chiang Mai, Thailand. The forecasting performance is compare among six combination method. i.e., Simple Average method (AVG), Variance-Covariance method (VAR), Harmonic Mean method (HARM), Simple Average Control (AVG-C) , Variance-Covariance Control method (VAR-C) and Harmonic Mean Control method (HARM-C). The results suggest that, the mean absolute percentage errors (MAPE) of the Variance-Covariance Control method (VAR-C) are the lowest. The Variance-Covariance Control method was optimal for forecasting the foreign workers in Chiang Mai, Thailand.
The Power Plant Bidding Strategy in Contract Market
Authors: Dong Fu Gui
Published: July 2014

Owing to the fact that the power can not be stored directly and the supply must meet the demand in real time, the price of electricity is more volatile than other commodities. In order to hedge the risk, the power plant can sign the power sale contracts with big customers by the promissory price. Using the Bayesian equilibrium theory, this paper establishes the bidding models on two power plants competing for selling the electricity to the big customer. The computing result shows that the power plant’s optimal bidding strategy equals to the mean of the competitor’s ceiling bidding price and its own marginal cost.
Research on Innovation of Archives Management under Cloud Service Model
Authors: Xia Zhong Hua , Zhan Guo Hui , Zhang Dong Liang , Geng Mei Li , Liu Bang Fan
Published: July 2014

Cloud services as a new product of the information age, is to archives service improvement and innovation of great significance and role. By the connotation of cloud services and cloud services archives, and then exploring the application value of cloud services in the archives services. Finally, based on the cloud technology, proposed innovative services of archives management, in order to achieve healthy development of archives management services.
SWOT Strategic Optimization of Government Portal under the Background of Web 2.0
Authors: Hua Yan Hui , Zhan Guo Hui , Geng Mei Li , Li Peng Fei , Liu Bang Fan
Published: July 2014

Defining the concepts of Web2.0 and government portal, applying SWOT analysis, the internal and external conditions to optimize China's government portal are analyzed. Meanwhile based on the practical conditions of China's government portal, the array of development strategies including SO, WO, ST and WT strategies is worked out.With the development of science and technology, humanity entered a new importance to the people text to a user-centric government portal in Web2.0 era of e-government construction in the growing concern, for a variety of theoretical and practical research focus of government building portals help the government build a good image of the tree, raise the prestige and promote open government and clean and efficient, reduce administrative costs and improve the effectiveness of government services and therefore, how to face the opportunities and challenges brought by the government portal optimized properly handle its advantages and the relationship between disadvantage of building a service-oriented government has great practical significance.
Conformance Testing for SGSF-064-1
Authors: Kim Intaek , Awan Tayyab Wahab , Abed Ahmed Mahdi , Jang Hyuk Soo
Published: July 2014

A common conformance testing is needed before the modules equipped in the vehicle to ensure their design meet the standard requirements and capability to work together. In this paper SGSF-064-1 have been followed and its conformance testing items are described. SGSF-064-1 is the standard which provide communication interface for DC fast charging in Korea. We specially focused on the conformance testing when the vehicle is fully charged. We used TTC-3 language to perform simulation.
Dynamic Experiments on a 1/4 Scale New-Styled Korean Traditional Wooden House
Authors: Kim Yeong Min
Published: July 2014

This research performed dynamic tests on a 1/4 scale test model of a new-styled Korean traditional wooden house to study its dynamic characteristics. The dynamic tests were performed both by the impact hammer test and the shaking table test of an El-centro N-S seismic wave. Together with these dynamic tests, structural analysis was also performed and the results were compared. The natural frequency from the impact hammer test was slightly higher than that from the shaking table test. The natural frequency from the eigenvalue analysis was about 16~33% lower than that from both the impact hammer test and the shaking table test. It can be deduced that the rotational stiffness of joints of analysis model were somewhat underestimated than those of experiment model.
Spatial Structure of Land Use Based on Fractal Theory: Taking Shaoguan as an Example
Authors: Wei Wang , Chen Xiao Yuan
Published: July 2014

Based on fractal theory, this paper analyzed spatial structure of land use and calculated fractal dimension and stability in Shaoguan. And then the paper revealed the various types of land use spatial differentiation. The results showed that the spatial mosaic structure of woodland patches was the smallest on complexity, but strongest stability. Spatial mosaic structure of urban town rural settlements was smaller on complexity, but stronger stability. Spatial mosaic structure of cultivated land and orchard and grassland and unused land were large on complexity, but poor stability. Spatial mosaic structure of industrial land and transportation and water were larger on complexity, but less stability. The complexity and stability of each land use type spatial mosaic structure was obvious differences. The biggest difference was transportation land, followed by cultivated land, water, grassland, unused land, woodland, urban town rural settlements and orchard, industrial land spatial differentiation minimum.
Tunable Nanostructures and Sers Activities of Sputtered Thin Silver Films
Authors: Yin Chen Yue , Xu Li Na , Gu Ning
Published: July 2014

A series of silver films were fabricated on silicon by magnetron sputtering method, which enables us to finely tune silver nanostructures by adjusting sputtering process. We studied the evolutional nanostructures obtained from sputtering time, and investigated their corresponding SERS effects. Results show that nanogroove-structured thin silver films have strongest Raman signal enhancement. This work provides a very fast, simple and reproducible way to fabrication of SERS-active substrate with tunable nanostructures.
Preparation of (BaSr)0.5Sm0.5C0.8Fe0.2O3-δ and (BaSr)0.5Nd0.5C0.8Fe0.2O3-δ Cathodes for IT-SOFCs
Authors: Aquino Flávia M. , Marques Fernando M.B. , Melo Dulce M.A. , Macedo Daniel A. , Yaremchenko Aleksey A. , Figueiredo Filipe M.
Published: July 2014

The development of electrochemical devices towards clean energy generation has been intensified in the last years. In this context, fuel cells, and especially intermediate temperature solid oxide fuel cells (IT-SOFC) have received much attention. Perovskite type materials of composition Ba1-xSrxCo1-yFeyO3-δ, doped or not with rare earth ions, have been quite promising because they have good ionic conductivity and operate at relatively low temperatures (500 750 °C). In this study, powders of compositions (BaSr)0.5Sm0.5Co0.8Fe0.2O3-δ (BSSCF) and (BaSr)0.5Nd0.5Co0.8Fe0.2O3-δ (BSNCF) were prepared using commercial gelatin powder as a polymerizing agent for its use as cathode. The as-prepared powders were calcined at 1000 oC and characterized by X-ray diffraction and scanning electron microscopy. Screen-printed symmetrical cells were sintered 1150 °C and studied by electrochemical impedance spectroscopy in order to assess the cathode kinetics for the oxygen reduction reaction. The best area specific resistance was found for the BSSCF cathode sintered at 1150 °C for 4 h (0.157 Ω.cm2 at 750 °C), demonstrating that this novel composition is suitable for application as SOFC cathode material. key words: Cathode, microstructure, impedance spectroscopy, IT-SOFC.
Development of Novel Photoelectrode Materials with Improved Charge Separation Properties
Authors: Sheppard Leigh Russell , Lamo Marta Bello , Dittrich Thomas , Wuhrer Richard
Published: July 2014

This investigation was aimed at identifing the scope for exploiting segregation phenomena to improve the ability of doped TiO2 to separate photo-generated charge carriers. By applying several controlled conditions of temperature and oxygen activity during the annealing of Nb-doped TiO2 (0.65 at. %), compositional gradients were imposed within the surface and near-surface regions due to solute segregation. These compositional gradients were characterised using secondary ion mass spectrometry (SIMS) and Xray photoelectron spectroscopy (XPS), and then tested for charge separation abilities using surface photovoltage spectroscopy (SPS). This investigation has revealed that processing Nb-doped TiO2 under conditions that favour the depletion of Nb from the surface and near-surface region yields stronger charge separation. While this is attributed to the formation of a homo-junction that is providing additional driving force for charge separation, the altered impact of Nb5+ and related defect disorder may also play a role. This investigation has provided encouraging preliminary outcomes to stimulate further investigations.
PZT Dielectric Ceramic Characterization for Application in Nonlinear Transmission Lines
Authors: Silva Neto Lauro Paulo , Rossi Jose O.
Published: July 2014

Nonlinear dielectric lines have been tested for use in RF generation. Although they have presented a reasonable success in the frequency range between 250 and 400 MHz, their main limitation is the dielectric losses of barium titanate (BT) tiles used as nonlinear medium in these lines, which prevents from achieving higher frequencies. The solution for this appears to be the search for a new dielectric. Herein, we are proposing the use of a piezoelectric titanate-based ceramics known as PZT (lead zirconate titanate), which appears to have lower dielectric losses than BT slabs. In this paper, loss characterization tests of the PZT ceramics are compared with BT in the MHz frequency range. Also, we have investigated and compared the nonlinearity properties of the dielectrics by varying the DC applied voltage and temperature.
Titanium K-Edge XAS Study on Local Structure of Pb1-xCaxTiO3 Ferroelectric Ceramics
Authors: Mesquita Alexandre , Estrada Flavia Regina , Mastelaro Valmor Roberto , Eiras José Antônio , Garcia Ducinei
Published: July 2014

In order to characterize the local structure of Pb1-xCaxTiO3(PCT) samples, Ti K-edge XANES measurements were performed and showed that Ca incorporation to PbTiO3structure leads to a decreasing of local distortion of Ti atoms in relation to oxygen atoms at the TiO6octahedra. Moreover, according to EXAFS measurements, the local structure around Ti atoms exhibits tetragonal symmetry withP4mmspace group for samples with x 0.475, whereas orthorhombic symmetry withPbnmspace group was observed for x equals to 0.50 and 0.55.
Effect of Manganese Dioxide Addition on the Cubic Phase Stability, Densification and Electrical Conductivity of Scandia-Stabilized Zirconia
Authors: Santos Emanuelle Z. , Muccillo Reginaldo
Published: July 2014

Zirconia stabilized with 8-12 mol% scandia shows the highest value of oxide ion conductivity among zirconia-based oxides. However, the cubic-rhombohedral phase transition at approximately 600 °C prevents its use as high temperature solid electrolyte. To circumvent this problem, additives have been proposed. In this work, ZrO2:10 mol% Sc2O3 was mixed to MnO2
and sintered at 1200 oC/2 h + 1450 °C/2 h with addition of 1, 1.5, 2 and 2.5 mol% MnO2. All specimens were analyzed by X-ray diffraction for structural phase evaluation and dilatometry for densification. Polished and thermally etched surfaces were observed in scanning electron microscope and scanning probe microscope. Impedance spectroscopy measurements were carried out in the frequency range 5 Hz-13 MHz in the 300-500 oC temperature range. The main results show that the manganese dioxide addition prior to sintering leads to the formation of single cubic phase, to the reduction of the maximum shrinkage temperature, and to an increase in the value of the total oxide ion conductivity.
External Memory Interface Verification Based on VMM
Authors: Xu Rui , Jiang Zhan Peng , Dong Chang Chun , Lu Xue Bin
Published: July 2014

With the growth of the scale of SoC, function verification becomes more and more complicated. Traditional functional verification method is confronted with some challenges. This paper achieves coverage-driven, constrained-randomization and assertion verification methodology based on SystemVerilog and VMM, to build verification platform by taking example of EMI (external memory interface). As result of verification, we can monitor coverage, control the platform, optimize testbench and testcase, finish function coverage 100%. These applications can simplify complex function verification, improve the platform reuse, and meet the needs of chip verification.
Numerical Simulation of Rapid Solidification Process for Micrometer Level Solder Ball Used in BGA Packaging
Authors: Li Shu , Huang Jian Wei , Wang Fei , Liu Wei
Published: July 2014

We numerically simulated the containerless rapid solidification for micrometer level solder ball used in BGA packaging, based on prior models for heterogeneous droplet nucleation and non-equilibrium solidification, to predict the solidification microstructure of solder ball. Results of simulations for Sn-5mass%Pb solder ball produced under different conditions are discussed.
Research on Reusable Software Process Model Based on Petri Net
Authors: Tang Guang Yi , Yao Deng Ju , Cui Li Jie
Published: July 2014

Software process reuse can improve the quality of software products and save the cost of software development, in order to make it more convenient for software organization to build software process model rapidly and efficiently, a method was proposed to analyze the value model which is based on the Petri net, introduces the concept of time and the implementation of value, through a specific algorithm design to provide guidance and decision-making basis for assessing the reuse of software process.
New Solution for Small File Storage of Hadoop Based on Prefetch Mechanism
Authors: Zhou Hui Xiang , Wen Qiao Yan
Published: July 2014

Hadoop performance a significant advantage in dealing with large files, but it is ineffective if we use Hadoop to handle a large number of small files, because the physical address of the Hadoop file is stored in a single Namenode. Suppose that the size of a small file is 100Byte, if there are such a large number of these small files, it may lead to greatly reduce the utilization of Namenode memory, and due to the large number of small files make the index directory increase, it also lower the rate of user accessing to files. To solve the problem described above, this paper propose a new solution for small file storage of Hadoop based on prefetch mechanism, experiment shows that this solution can effectively improve the memory utilization of Namenode and significantly improve the speed of user accessing.
Adaptive Pixel Crosstalk Compensation for CMOS Image Sensor
Authors: Zhao Chang Rui , Chi Xiao Ming , Wang Zhen Yu , Yan Wei , Li Dong
Published: July 2014

A new algorithm for removing pixel crosstalk in CMOS image sensors with Bayer color filter array was proposed. The algorithm can estimate low/high frequency image and provide adaptive threshold based on the human visual characteristics. By simulation experimentation on Macbeth color checker, resolution checker and real image, the experimental results revealed that this algorithm can remove the pixel crosstalk effectively.
Analysis of the Tongue Body Fat and Thin Based on the Neural Net
Authors: Zhang Kang , Ding Cheng Hua , Du Jian Qiang , Wang Can Hua , Shi Jin
Published: July 2014

In this paper, first detect the edge of the tongue, to obtain the edge of tongue body coordinates. Then split the tongue using a variety of curve fitting function to analysis plumpness and slenderness of tongue, and compare the accuracy of different curve fitting. Finally, classify the fat tongue and thin tongue by using the neural network.
The Beidou Satellite High-Precision Timing Applied Research
Authors: Hu Zhao Peng , Hua Yu , Li Shi Feng
Published: July 2014

The Beidou (BD) satellite navigation & orientation system is so important of national information infrastructure for our country. After research the BD system in the timing area, whlie analysed the advantage of the Beidou satellite timing technology compared with other conventional timing method, combined with high precision timing experiment and depending on the Common-view experimental results proved that the beidou statllite navigation & orientation system has high research value.
Simulation of FBG Wavelength Signal Demodulation Based on Sideband Filter
Authors: Ren Nai Kui , Xiong Yan Ling , Wu Ming Ze , Xu Hao , Ma Zhen Yu , Zou Ji Yun
Published: July 2014

The wavelength of Fiber Bragg grating (FBG) sensor signal demodulation simulation system based on the quasi-linear relationship between the transmission side band of optical filters and wavelength was established by the simulation software of MABTLAB. The simple system only consists of broadband source, sideband optical filters, couplers, a FBG, data acquisition and processing system. The relationship between the information of FBG central wavelength and the transmitted light intensity of sideband filter were obtained when the alternating and gradually varying signal applied to the FBG sensors, respectively. The FBG wavelength demodulation can be achieved by sideband filtering, and results are consistent with the theory.
Corrected Differential Evolution Particle Filter for Nonlinear Filtering
Authors: Zhang Chao Zhu , Li Lin
Published: July 2014

Particle filter is the most successful nonlinear filter for nonlinear filtering. However its resampling process has the critical problem existing is the particle impoverishment problem. In this letter, we propose a new corrected differential evolution particle filter for solving this problem. In this algorithm, the particles sampling from the importance distribution are regarded as the initial population of the Corrected Differential Evolution (CDE) algorithm, and the corresponding weights as the fitness functions. The optimal particles are obtained by the process of the CDE algorithm. Experiment results indicate that the proposed method relieves the particle degeneracy and impoverishment and improves the estimation precision.
Effectiveness Evaluation Model for Collaborative Command and Control System
Authors: Xiao Yu Jie , Qiu Zhi Ming , Shi Zhang Song
Published: July 2014

Based on the theory of information and structure entropy, this paper analyses the influence of collaborative command and control system on information flow. Two concepts, time-effect and equality of information flow, are introduced, and the time-effect quality model is established, which can be used for evaluating the order degree of collaborative command and control system. Centralized, recursive and network cooperative structure and its time and space complexity respectively discussed. Study has shown that the recursive cooperative structure under the control of the command center is a relatively good structure.
Microwave Performance Simulation of RF-MEMS Switch
Authors: Wu Rui , Song Ming Xin
Published: July 2014

This paper presents the calculation model of capacitive RF-MEMS switch for the isolation and insertion loss, and then adopts CST software to simulate microwave performances. The simulation results show that return loss can reach-21.5dB and isolation can reach-0.26dB when the distance between contacting metal and dielectric layer adopts 2ڌ̏̽, 6×?103ڌ̏̽2 of contacting area and 20ڌ̏̽ of groove depth.
A New Sensor for the Electrical Equipment Leakage Current
Authors: Wei Xin Lao , Zheng Wen Lei
Published: July 2014

To achieve the accurate and non-contact detection of the electrical equipment leakage current at the millampere level, this paper presents a new single-turn cored clamp-type sensor named the Microcrystalline-alloy Rogowski coil. The creative construction technique of the new sensor remedies the disadvantage of the Rogowski coil with the structure of microcrystalline alloy core. The experimental test of the prototype was carried out to show the superior performance and the excellent practical value in the application of the faint current measurement.
A Measuring Method of Liquid Food Conductivity Based on Pulse Response Measurement Method
Authors: Wei Xin Lao , LI Yu Long
Published: July 2014

The food conductivity is one of impact factors on pulsed electric field sterilization. Abnormal breakdown of high conductivity liquid is also one of the bottlenecks in pulsed electric field sterilization technology. The conductivity of liquid food should be accurate calculated for searching the mechanism of abnormal breakdown deeply. An accurate measuring method of conductivity of liquid food is proposed based on pulse response method. Conductivity can be calculated by data recorded from oscilloscope with electrical pulse treating on the conductance cell. This method can decrease the impact of stray capacitance and polarization phenomenon on measured results.
Analysis of Data Mining Method for Near Infrared Spectral Data of Dairy Products Based Orthogonality
Authors: Wang Li Jie , Zhou Zhen , Qin Yong , Yin Jin Ying , Guo Jian Ying , Dong Wen Ning , Wang Dan
Published: July 2014

There are advantages such as real time, quick, multi-constituents simultaneous measurement, green and no pollution, and so on, of using near infrared spectral method to detect concentration information of dairy products constituents. From time domain and frequency domain, near infrared spectral data mining methods based on orthogonality were separately researched to realize noise filtering and useful information extracting. For milk spectrum, methods in the time domain including Orthogonal Signal Correction and Direct Orthogonalization, Wavelet Transform de-noising method in the frequency domain, were separately explored and used in spectral preprocessing, PLS method was used to build calibration model, and processing effect of different data mining methods was compared with and analyzed. It is showed that in the time domain, using the orthogonality methods to make data mining for milk spectrum, the complex interfering signal and noise information uncorrelated with the measured constituents can be can reduced effectively, and the correlated information with the measured constituents is reserved in maximal limitation, prediction capability of calibration model is improved, furthermore, the Orthogonal Signal Correction method is better than the Direct Orthogonalization method, moreover, in the frequency domain, wavelet de-noising is better than the orthogonality methods within the time domain.
A Bandgap Reference with Temperature Coefficient of 13.2 ppm/°C
Authors: Ren Ming Yuan , Zhao En Ming
Published: July 2014

This paper presents a design and analysis method of a bandgap reference circuit. The Bandgap design is realized through the 0.18um CMOS process. Simulation results show that the bandgap circuit outputs 1.239V in the typical operation condition. The variance rate of output voltage is 0.016mV/°C? with the operating temperature varying from-60°C? to 160°C?. And it is 3.27mV/V with the power supply changes from 1.8V to 3.3V.
Study on Low Frequency Oscillation of Wind Power System Based on HHT
Authors: Xie Hong Ling , Yue Ting
Published: July 2014

For the output of wind power system has the characteristics of randomness, volatility and intermittence, the voltage of wind power system low frequency oscillation is one of the most common fluctuations in the system. For the problem of low frequency oscillation, the limitations of the detection methods such as the Lyapunov linearization method, the Prony method, wavelet transform method are summed up, and a new detecting method named Hilbert-huang Transform (HHT) is put forward in this paper, which can detect the oscillation accurately and timely. To solve the problem of end effect in the process of empirical mode decomposition (EMD), B-spline empirical mode decomposition based on support vector machine is applied in dealing with the end issue. an extension of the original signal is applied. Then, calculating the average curve of the signal by B-spline interpolation method. Finally getting the intrinsic mode function (IMF) by empirical mode decomposition (EMD). The practicality of the method is verified by Matlab simulation.
Operational Capability of Ship-to-Air Missile Weapon System
Authors: Lu Yong Hong , Dou Ji Hua , Yang Xing Bao , Zhu Chuan Wei
Published: July 2014

As operational capability of the weapon system can be varied with each fire, it proposes operational capability evaluation method for the weapon system, afterwards it proposes operational capability evaluation method for the weapon fire taking the impact indicators such as single target detection probability of shipborne early-warning radar into account.
Synthesis of CdS-Capped CdSe Nanocrystals without any Poisonous Materials
Authors: Zhou Wu Lei , Cai Tuo , Chen Yun , Chen Xuan Lin , Qu Yu Qiu , Huang Xing Bin , Dai Wen Jiang , Xiao De Hang , Yu Chang Bin , Wei Hong , An Li Min
Published: July 2014

CdS-capped CdSe nanocrystals (NCs) which show high luminescence quantum yield are synthesized without any Poisonous Materials in aqueous solution. The synthesis in an aqueous medium without any poisonous materials is attached importance to. The absorption spectroscopy and photoluminescence spectroscopy are employed to analyze the NCs. It takes 78s that the intensity decreases to the half for bare CdSe NCs, but 442s for CdSe/CdS core/shell NCs. The photo stability of CdSe NCs under 325nm laser irradiation is enhanced greatly after CdS overcoating.
The Preparation and Characteristics Analysis of ZnO/Ni/ZnO Schottky Junction TFTs
Authors: Shan Yue , Wu Yan Hong , Wang Dong Xing , Zhang Yue , Chen Jia Bin , Yin Jing Hua , Zhao Hong
Published: July 2014

Using radio frequency magnetron sputtering deposition deposit ZnO films on SiO2glass, and prepare vertical structure ZnO-based thin film transistor. By means of measurement, obtain the static output characteristics, the output current can achieve the order of milliampere, get the transfer characteristics of ZnO TFTs; transconductance which get the largest value gm=0.0061S when source-drain voltage VDS=3V, source-gate VGS=0.4V; output resistance and voltage amplification coefficient, the smallest voltage amplification factor is μ=1.16056,still have voltage amplification effect.
The Preparation of Alq3/CuPc Heterojunction Organic Electroluminesence Diodes
Authors: Wu Yan Hong , Shan Yue , Wang Dong Xing , Meng Cai Min , Yang Yan Wei , Fu Jian , Deng Shi Kun
Published: July 2014

With the method of vacuum dc sputtering and vacuum evaporation,the green light double organic light-emitting devices (OLED) of ITO/CuPc/Alq3 / Al structure were prepared, the electrical characteristics and electroluminescent properties of the device were measured. Devices show good luminous performance, light intensity reaches 600000 cps, when the wavelength of luminescence spectrum is 510 nm, luminance is 2641I/a.u.
Optimized Technical Characteristics of Polysilicon Nanofilm
Authors: Lu Xue Bin , Cui Lin Hai , Ren Ming Yuan
Published: July 2014

In order to take good advantage of polysilicon nanofilm, optimized technical characteristics of the polysilicon nanofilm are very necessary to investigated. In this paper, the polysilicon nanofilms were prepared under different technical parameters, including thickness and doping concentration, which are very important for preparation of the nanofilm. The experimental results of piezoresistive and temperature characteristics show that the optimized technical characteristics are followed, the thickness is about 90nm, and the doping concentration is about 4.1×?1019cm-3 or between 2.0×?1020cm-3 and 4.1×?1020cm-3 from different point of view. The investigations of optimized technical characteristics are very useful for application of the polysilicon nanofilm to piezoresistive sensor.
Research on the Effects of Ultraviolet Aging of Polyethylene Trap Distribution
Authors: He Li Juan , Zhu Chao , Huang Huai Chong , Wang Shan , Xie Hai Ping , Chen Chun Tian
Published: July 2014

The photo-stimulating discharge (PSD) and ultraviolet-visible spectrometry were used to characterize the polyethylene (PE) and nano-hybrid PE trap before and after ultraviolet aging. In PE with the increasing of ultraviolet aging time, shallow traps reduce gradually and deep traps increase gradually, but for the nano-hybrid PE, shallow traps increase gradually and deep traps reduce gradually. Experiments show that: in the process of aging PE produces oxidation products such as carbonyl, hydroxyl etc. The incorporation of impurities can inhibit the injection of space charges, so as to achieve the purpose of improving electric field distortion in the body of the PE.
A New Type of EO Polymer Based on Polyphosphazenes
Authors: Zhang Ying , QIU Cheng Jun , Li You , Zhang Wen Long , Wang Xuan
Published: July 2014

Polyphosphazenes containing carbazole grafted by azo nitrobenzene is synthesized by microwave method in this paper. Its structure is characterized by infrared (IR) spectroscopy and UV-visible spectroscopy. This new polymer, with both electro-optic(EO) property and photoconductive property, has unique stability and can be easily processed. Terahertz(THz) wave can be detected using the device which is made with our new polymer. The time domain waveform and frequency spectrum of the THz wave are obtained.
Analysis of Financial Agglomeration Effect on Corporate Financing Behavior
Authors: Li Fei Fei , Huang Jie Yu
Published: July 2014

Financial agglomeration is the transfer and concentration of financial resources in space , this transfer and concentration can make the zone enterprises obtain financing at lower cost, particularly financial agglomeration can reduce the enterprise financing cost, time cost, and unstable financial risk cost ; then this paper uses the listing Corporation and the various provinces and cities in 2011 which issued A shares of the financial as the sample data, starting from the financial agglomeration effect on the enterprises' financing behavior as the point of empirical analysis, the results show that: the financial agglomeration degree and the enterprise financing cost is negatively related, namely the financial agglomeration reduces the financing cost.
Evolving Model Research of Layered Agri-Food Supply Chains Weighted Complex Networks
Authors: Li Yang , Du Zi Ping , Zhang Liang
Published: July 2014

In this paper, we analyzed the characteristics of the agri-food supply chain network, described the reasons of the network hierarchy generated. Based on the analysis we proposed a layered agri-food supply chains weighted complex network model. This model possess topological characteristics of the real network, and effectively depicted the mechanism of formation and evolution of the agri-food supply chain network. This has important practical and theoretical significance for the rational design of agri-food supply chain network.
Numerical Simulation of Rocket Nozzle
Authors: Srinivas G. , Potti Srinivasa Rao
Published: July 2014

The vent or opening is called nozzle. The objectives are to measure the flow rates and pressure distributions within the converging and diverging nozzle under different exit and inlet pressure ratios. Analytic results will be used to contrast the measurements for the pressure and normal shock locations. In this paper computational Fluid Dynamics (CFD) Analysis of various performance parameters like static pressure, the Mach number, intensity of turbulence, the area ratio are studied in detail for a rocket nozzle from Inlet to exit by using Ansys Fluent software. From the public literature survey the geometry co-ordinates are taken. The throat diameter and exit and diameter are same for all nozzles. After the simulation the results revealed that the divergence angle varies the mach number and other performance parameters also varies. For smaller nozzle angle the discharge coefficient increases with increasing pressure ratio until the choked condition is reached for varying the divergence angle.
Design, Fabrication and Experimental Analysis of Pandanus Fibre Reinforced Polyester Composite
Authors: Vigneshwaran G. Veerakumar , Jenish I. , Sivasubramanian Rajeshwaran
Published: July 2014

Due to the light weight, high strength to weight ratio, corrosion resistance and other advantages, natural fibre based composites are becoming important composite materials in mechanical engineering fields. The current project emphasizes the newly identified Pandanus Fibre (Pandanus Fascicularis) which is extracted from the stem of screw pine tree by the manual water treatment process. The mechanical properties of chopped Pandanus fibre by Polyester composites are investigated and compared with the similar natural fibres in the fibre reinforced composite material field. The composite plates were fabricated with raw pandanus fibres by compression moulding method with varying weight percentage and lengths of fibre.
Tribological Charecterization of Carbon Epoxy Composite Materials with Particulate Silane Treated SiC Fillers
Authors: Prabhu Stalin J.R. , Jenish I. , Indran S.
Published: July 2014

The polymeric matrix Composite Materials is widely used for automotive and aeronautical industry applications due to its superior properties. The tribological properties of the Carbon Epoxy Composites with 5% of silane treated SiC and 10% of silane treated SiC which were added separately and it has been investigated experimentally by the dry sliding wear test using the Pin-on-Disc type wear test rig. The main parameters Sliding Speed (S), Applied Load (L) and Sliding Distance (D) which were considered for the experimental investigation and evaluated the dry sliding wear characteristics of composites. Under increased levels of loads and sliding velocity conditions higher wear loss was noted. The coefficient of friction values from the result shown that the increased value with addition in load and also sliding velocity. It results was compared that the Carbon Epoxy Composites containing ST - SiC Fillers having lower Coefficient of Friction than plain Carbon Epoxy Composites. From the observations maximum wear resistance were found and discussed.
Thermal Analysis on Joining of Dissimilar Metals by Friction Stud Welding
Authors: Hynes N. Rajesh Jesudoss , Nagaraj P. , Tharmaraj R.
Published: July 2014

Friction welding is a solid state joining technique used for joining similar and dissimilar materials with high integrity. This new technique is being successfully applied to the aerospace, automobile, and ship building industries, and is attracting more and more research interest. Owing to the significance, thermal analysis on friction stud welding of mild steel and aluminium combination is carried out in the present work. In this study the temperature profiles at different locations are predicted mathematically by using one dimensional finite element method.
Optimization of Remaining Useful Life for Paralleled Battery Packs on Expansion Mode
Authors: Huang Sheng Jun , Zhang Yan , Zhang Tao , Guo Bo
Published: July 2014

Remaining useful life (RUL) is of great importance to energy supply systems, such as battery pack. In this paper, an optimization model of RUL for the paralleled battery pack on expansion mode is proposed based on the basic concept of RUL and the capacity fading model. genetic algorithm (GA) is adopted to solve the problem. Case study shows that the battery pack's RUL can be extended by using the optimization model and GA.
Research on the Lithium Battery Pack Cooling by Thermal Simulation
Authors: Chen Yi Ning , Li Ce Yuan
Published: July 2014

Batteries are used the energy storage of the pure electric vehicle. When the battery pack work in the high temperature environment for a long-term, permanent damage that high temperature does to the battery cannot be restored, the battery life will be drastically reduced. When the batteries temperature reaches a relatively high value, the battery pack will caught fire. This paper firstly analyzed the characteristic of the Lithium-ion Battery by batteries experiment. On the basis of the thermal experiment ,this paper do a lot of research of the cooling method by ANSYS and verified the accuracy of the model of the thermal model.
Analyze for Design Philosophy on the Route and Process for Gas Pipeline in the Middle-Asia District
Authors: He Wei , Wang Guo Xing , Ji Chang Hua , Gong Yun Feng
Published: July 2014

According the experience of gas pipeline project in the Middle-Asia district, the writer analyzes and concludes the design feature for the pipeline route and the process scheme for the gas pipeline project in the Middle-Asia district. For the requirement of code SNIP, ASME and Chinese specification, the writer analyzes the difference and design feature on the design requirement and draws the conclusion. The pipe grade, design parameter, wall thickness selection and the process design for station are detailed described in the article, which can expand the design thought and provide the reference for the similar project.
Design of the Voltage-Controlled Bandpass Filter Based on Current Feedback Op Amp
Authors: Ma Sheng Qian , Ji Yan Ping , Ran Xing Ping , Zhang Wei Zhao , Yang Yang
Published: July 2014

This paper puts forward structure and realization method of the voltage-controlled band-pass filter based on the current feedback operational amplifier (CFA) which uses bi-quad loop filter circuit model to design the new filter circuit. Input voltage signal is input to voltage-controlled band-pass filter circuit composed by an analog multiplier AD835 and a current feedback operational amplifier AD8001 which are the core. Using the voltage signal to adjust the center frequency of the filter, the filter has wide frequency band and good high-frequency performance. This paper describes the design principles, infers the design formulas and designs the circuit of the voltage-controlled first-order and second-order band-pass filter.Through the simulation, the filter can realize the scope of the center frequency from 200KHz to 10MHz.
Drive Circuit Design of H-Bridge Permanent-Magnet DC Moment Motor Based on HIP4081 Chip
Authors: Zhao Bing
Published: July 2014

In order to achieve reliable drive for Permanent-magnet DC moment motor and high-precision control, we use special chips designed HIP4081 H-bridge PWM motor drive circuit bipolar reversible, with DSP as the controller completed a two-way rotation and permanent magnet DC motor speed control . Experiments show that the circuit is safe, reliable, environmental adaptability, good thermal conductivity, high efficiency, applicable to Permanent-magnet DC moment motor powered a variety of control systems.
Synthesis and Performance Evaluation of Pour Point Depressants for Lubricating Oil
Authors: Zheng Wan Gang , Wang Shu Jun , Meng Fan Bin , Ma Huan Qing , Li Yan Shan
Published: July 2014

The paper describes synthesis and evaluation of polymeric additives for improving the flow properties of lubricating oils. The polymer (AAV) was prepared by the free-radical initiated polymerization of methacryl esters (A14) with acrylamide and vinyl acetate. A14 and AAV were characterized by infrared spectroscopy (IR). Three lubricating oils were selected as the test oil samples and the effect of solidification point depressant (ΔSP) with different mass fractions and other physicochemical characteristics of the samples with and without AAV added were investigated. In order to analyze the effect of AAV on the viscosity of lubricating oils, viscosity-temperature curves were plotted. The results showed that AAV not only had a good effect on dropping solidifying point for Yanshan lubricating oils, but also had a good effect on dropping viscosity; what’s more, other physicochemical characteristics of lubricating oil have little changes before and after AAV added.