bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis And Properties Of Magnetic Nanoparticles With Tunable Magnetic Anisotropy Energy
Authors: Dupuis Vincent , Gavrilov-Isaac Véronica , Neveu Sophie , Aouadi Merwen , Abramson Sébastien
Published: May 2014

In this paper, we discuss several strategies to tailor magnetic properties related to the magnetic anisotropy energy, such as the blocking temperature or the low temperature coercivity, of magnetic nanoparticles or materials made with magnetic nanoparticles. We describe a first approach that consists in synthesizing and dispersing bi and tri-magnetic core-shell nanoparticles that include a core made of a material with a weak anisotropy energy density and a shell made with a material with a large anisotropy energy density. This approach is a promising route to tune the blocking temperature of low temperature coercivity of a particle without altering its magnetization and with a good control of its size. Additionally, we also explore another route for the control of the shape of the hysteresis loop of material made with magnetic nanoparticles that consists in the simple mixture of magnetically soft and hard magnetic nanoparticles to create binary mixtures. In this case, it is the mixing ratio that allows one to adjust the properties of the final material.
Chemistry at the Dirac Point of Graphene: Diels-Alder Approach to Reversible Band Gap Engineering and High Mobility Graphene Devices
Authors: Sarkar Santanu
Published: May 2014

The Diels-Alder (DA) pericyclic chemistry is one of the most powerful reactions in synthetic chemistry. We have recently shown that the unique zero-band-gap electronic structure of graphene at the Dirac point facilitates the band-gap-dependent DA reaction of graphene, although graphene is the thermochemical reference for carbon. We have shown that in the DA reactions, graphene can function either as a diene or a dienophile (dual nature). Such DA functionalization of graphene when applied to graphene-FET devices allows balanced functionalization (creation of a pair of new sp3 centers or divacancies) at both A and B graphene sublattices, allowing the fabrication of high mobility DA-functionalized single-layer graphene devices (DA-SLG) with acceptable on/off ratio. The chemistry is thermally reversible via retro-DA chemistry, thus allowing reversible engineering of graphene devices.
On the effect of grain boundaries on the electronic and transport properties of graphene
Authors: Elias Watheq , Elliott M. , Matthai C. C.
Published: May 2014

In studying large scale graphene structures it is necessary to consider the grain boundaries between the many single-crystal domains. The disruption of the crystallographic structure has consequences for both the electronic and transport properties. Although there has been much interest in this area in recent years, the size of system makes it difficult for ab initio methods to be applied to large structures and tight-binding models have provided some interesting results [1]. The semi-empirical Extended Hückel Theory (EHT) has advantage of being able to take account of charge reordering and to study very large systems. We have already applied this approach to study electrical transport across organic molecules and carbon nanoribbons. In this paper, we report on the results of EHT self-consistent calculations carried out to investigate the effect of grain boundaries on both the electronic structure and the electrical transport.
Meeting-or-Beating, Earnings Management, and Investor Sensitivity after the Scandals
Authors: Byun Sanghyuk , Roland-Luttecke Kristin
Published: May 2014

SYNOPSIS

We contribute to the literature investigating the market reaction to firms' small positive earnings surprises following the large accounting scandals in the early 2000s. While prior studies provide evidence that the market no longer rewards firms for meeting-or-beating (MBE) in the post-scandal period, their efforts to address the rationality of the market response invite additional analysis. We demonstrate that the change in the market reaction to MBE is consistent with temporary over-skepticism. Specifically, we show that the market does not differentiate between MBE achieved operationally versus through earnings management, despite previously documented differences in future performance. We explore the relation between MBE, earnings management, and future performance in the post-scandal period and find evidence of mispricing consistent with the market underreacting to small positive earnings surprises earned by firms that do not appear to have manipulated earnings to MBE. Our study provides evidence of a potential market anomaly, which should be of interest to financial managers, researchers, and investors, and speaks to capital market regulation.

Data Availability: Data are available from sources identified in the paper.
Comparison of Five Svd-Based Algorithms for Calibration of Spectrophotometric Analyzers
Authors: Wagner Jakub , Morawski Roman Z. , Miękina Andrzej
Published: May 2014

Spectrophotometry is an analytical technique of increasing importance for the food industry, applied i.a. in the quantitative assessment of the composition of mixtures. Since the absorbance data acquired by means of a spectrophotometer are highly correlated, the problem of calibration of a spectrophotometric analyzer is, as a rule, numerically ill-conditioned, and advanced data-processing methods must be frequently applied to attain an acceptable level of measurement uncertainty. This paper contains a description of four algorithms for calibration of spectrophotometric analyzers, based on the singular value decomposition (SVD) of matrices, as well as the results of their comparison - in terms of measurement uncertainty and computational complexity - with a reference algorithm based on the estimator of ordinary least squares. The comparison is carried out using an extensive collection of semi-synthetic data representative of trinary mixtures of edible oils. The results of that comparison show the superiority of an algorithm of calibration based on the truncated SVD combined with a signal-to-noise ratio used as a criterion for the selection of regularisation parameters - with respect to other SVD-based algorithms of calibration.
Improved Accuracy of Damage Index Evaluation in Concrete Structures by Simultaneous Hardware Triggering
Authors: Lamonaca Francesco , Carrozzini Antonio , Grimaldi Domenico , Olivito Renato Sante
Published: May 2014

Non-invasive damage monitoring of concrete structures by means of Acoustic Emission (AE) requires multitransducers, multi-channel acquisition, high sampling frequency and long observation time. Owing to its propagation in concrete, the signal from AE reduces its amplitude during the propagation, and, consequently, some events can be lost due to lower signal intensity than the trigger level set on one sensor only. The innovative proposal discussed in the paper consists in the introduction of a Flat Amplifier and Trigger generator block (FAT) in order to generate a logical trigger when the AE is detected by any transducer. Experimental tests confirm the effectiveness of the FAT to acquire all the AE events and to increase the evaluation accuracy of damage indexes.
Space-Time Estimates of Mild Solutions of a Class of Higher-Order Semilinear Parabolic Equations in Lp
Authors: Sandjo Albert N. , Soh Célestin Wafo
Published: May 2014

We establish the well-posedness of boundary value problems for a family of nonlinear higherorder parabolic equations which comprises some models of epitaxial growth and thin film theory. In order to achieve this result, we provide a unified framework for constructing local mild solutions in C
Influence of human activities on the soils of Debrecen, Hungary
Authors: Sándor Gábor , Szabó György
Published: May 2014

Soil profiles of the city centre of Debrecen were investigated in order to examine their properties and investigate the vertical distribution of heavy metals as a measure the anthropogenic activity. During the laboratory work the basic soil features were identified (texture, artefact content, pH, CaCO3, and amounts of organic matter). Furthermore, contents of Pb, Zn, Cu and Co in the soils were measured. Most of the metals showed a strong positive correlation with the humus content and the silt fraction. The soils of the city centre are exposed to a significant anthropogenic effect, therefore the original soil morphologies are usually difficult to identify. The soil profiles are greatly disturbed, which is traceable in the vertical distribution of certain soil features and metal contents.
Editorial: The Rise of Interdisciplinarity
Authors: Pun Min
Published: May 2014

DOI: http://dx.doi.org/10.3126/ctbijis.v1i1.10462 Crossing the Border: International Journal of Interdisciplinary Studies Vol.1(1) 2013
Globalization and its Impact on the Third World Economy
Authors: Sharma Neelam Kumar
Published: May 2014

Globalization is a controversial issue in the third world countries. ! is study tries to determine the factors associated with this controversy and explained the economic impacts of globalization in the third world countries on the basis of some of the scholars' arguments expressed on the subject. In the recent past, there have been the pros and cons of globalization in developing countries. Some argue that globalization is indeed a necessary evil to the third world countries that it can neither be rejected nor fully applied to its national policy. However, many others suggest that globalization should be looked at in all its manifestations and from different angles. In order to address this issue, when considered from the economic point of view, the negative economic impacts of globalization should be minimized and exportable capacity of the third world economy in the global market should be increased in a step by step manner. DOI: http://dx.doi.org/10.3126/ctbijis.v1i1.10465 Crossing the Border: International Journal of Interdisciplinary Studies Vol.1(1) 2013; 21-28
Point-of-care Diagnostic Tools to Detect Circulating MicroRNAS as Biomarkers of Disease
Authors: Vaca Luis
Published: May 2014

MicroRNAs or miRNAs are a form of small non-coding RNAs (ncRNAs) of 19–22 nucleotides in length in their mature form. miRNAs are transcribed in the nucleus of all cells from large precursors, many of which have several kilobases in length. Originally identified as intracellular modulators of protein synthesis via posttranscriptional gene silencing, more recently it has been found that miRNAs can travel in extracellular human fluids inside specialized vesicles known as exosomes. We will be referring to this miRNAs as circulating microRNAs. More interestingly, the miRNA content inside exosomes changes during pathological events. In the present review we analyze the literature about circulating miRNAs and their possible use as biomarkers. Furthermore, we explore their future in point-of-care (POC) diagnostics and provide an example of a portable POC apparatus useful in the detection of circulating miRNAs.
Understanding Organized Retail Supply Chain Environment
Authors: Singh Rajwinder , Sandhu H. S. , Metri B. A. , Ghera R. S.
Published: May 2014

The organized retail is a sunrise industry in India. Managing organized non-livestock retailing (NLR): which is the retailing of agricultural and horticultural products, is a big challenge for the retail players. In this paper, the twenty two factors affecting supply chain (SC) performance have been classified into three groups using factor analysis i.e., strategic management, operations management, and environmental dynamics. A confirmatory model is also tested to know the effect of these factors/items on SC decisions. The results indicate that the focus on these factors shall help organizations to diagnose, manage and improve SC performance.
Finite Element Modelling of Stress-Induced Fracture in Ti-Si-N Films
Authors: Flores-Johnson E.A. , Shen Lu Ming , Annabattula R.K. , Onck P.R. , Shen Yao Gen , Chen Zhen
Published: May 2014

Nanocomposite coating films have been increasingly used in industrial applications because of their unique mechanical and physical properties. Residual stresses generated during the growth of sputter-deposited thin films due to a strain mismatch between the film and the substrate may lead to significant failure problems. Large residual stresses may generate buckling, delamination and film fracture. Although buckles with cracks in thin films have been experimentally observed, their origins are still not well understood.
Fundamental Studies of Vortices Induced by a Vortex-Generator for Automotive Applications
Authors: Islam Asiful , Doig Graham
Published: May 2014

For automotive applications, passive flow control devices can be used to reduce, delay or prevent flow separation. This study explores the nature of vortex generation and behaviour, numerically and experimentally, for a simple geometry at a Reynolds Number (Rex) of 5×105 and 1.945×106. The setup comprised a triangular vane vortex-generator mounted on a shallow ramp referenced from literature. Flow over the isolated ramp was validated with past experimental particle-image-velocimetry (PIV) data, which also highlighted the relative performance of various turbulence models. A parametric study was undertaken with the vane orientation defined by an angle-of-attack (β) and stream-wise location (xedge/xVG). These results revealed relationships between geometric parameters of the vortex generator, as well as the influence of the boundary layer thickness (hVG/δ), on the spatial trajectory of induced vortices.
The Contrast of Two Kinds of Microwave Antenna SAR Simulation
Authors: Nan Qun , Guo Xue Mei , Zhai Fei
Published: May 2014

Abst
r
a
c
t. Specific Absorption Rate (SAR) represents the electromagnetic radiation sorption ability of the biological organisms. It is a hotspot issue in thermal ablation. Different antenna structure can get the different SAR in clinical treatment. This study use simulation software HFSS which based on finite element method simulate the SAR of two microwave antenna (ETW antenna and Cap-Choke microwave antenna). Obtain the curves of SAR distribution, predict the temperature field more accuracy and provide method to design microwave antenna. The ratio of the long axis and short axis of Cap-Choke antenna is about 3:2, while the ratio of ETW antenna is 4.7:1.7. So Cap-Choke antenna is suitable for the ablation of tumor, while ETW antenna can meet to the requirement of linear ablation area in atrial fibrillation ablation therapy.
High Velocity Impact Modelling of Sandwich Panels with Aluminium Foam Core and Aluminium Sheet Skins
Authors: Liu Cheng Jun , Zhang Yi Xia , Qin Qing Hua , Heslehurst Rikard
Published: May 2014

A finite element model is developed in this paper to simulate the perforation of aluminium foam sandwich panels subjected to high velocity impact using the commercial finite element analysis software LS-DYNA. The aluminum foam core is governed by the material model of crushable foam materials, while both aluminium alloy face sheets are modeled with the simplified Johnson-Cook material model. A non-linear cohesive contact model is employed to simulate failure between adjacent layers, and an erosion contact model is used to define contact between bullets and panels. All components in the model are meshed with 3D solid element SOLID 164. The developed finite element model is used to simulate the dynamic response of an aluminium foam sandwich panel subjected to projectile impact at velocity ranging from 76 m/s to 187m/s. The relationship between initial velocity and exit velocity of the projectile obtained from numerical modelling agrees well with that obtained from experimental study, demonstrating the effectiveness of the developed finite element model in simulating perforation of sandwich panels subjected to high velocity impact.
Effect of Textile Architecture on Energy Absorption of Woven Fabrics Subjected to Ballistic Impact
Authors: Yang Cheng , Tran Phuong , Ngo Tuan , Mendis Priyan , Humphries William
Published: May 2014

Woven fabrics are widely used in various protective applications. The effects of different woven architectures (such as plain, basket, twill and satin) on impact resistance performance have not been adequately studied. In this work, high-speed impact testing on single layer plain weave structures has been carried out using a gas gun experimental setup. Ballistic resistance performance of the woven fabric is evaluated based on the resultant velocity of the projectile, as well as the post-mortem failure analysis. Finite element computational models are presented in this research, thereby providing predictive capability for the manufacturer and designer in order to minimise field testing, as well as shedding light on to the damage mechanisms of composite fabrics subjected to ballistic impact. The numerical model is validated with the experimental results in terms of dissipated energy and resultant velocity. Numerical investigation is conducted on other woven structures of identical areal density for comparison, revealing the importance of fabric architecture. The influences of yarn-yarn and yarn-projectile friction properties on the ballistic performance of various textile structures are also presented.
FEM/DEM Modelling of Hard Body Impact on the Laminated Glass
Authors: Chen Xu Dong , Chan Andrew H.C. , Yang Jian
Published: May 2014

Laminated glass is widely used for structural members in industry. Among all loading types, impact is one of the most adverse forms due to its dynamic effect. In order to investigate how laminated glass fractures under hard body impact and the subsequent fragmentation, the combined finite-discrete element method (FEM/DEM) was employed in this paper. This method discretises a single discrete element in finite elements, giving a more accurate estimate of the contact forces and deformation of the elements.
This paper presents the transient responses of a laminated glass beam under impact by using a simple mixed-mode (I + II) elasto-plastic fracture model developed for the FEM/DEM program. The results from this mixed-mode model has been compared and validated with that from Mode I fracture model. A parametric study on the laminated glass is performed based on the mixed-mode model, showing its better energy absorption capacity than monolithic glass and the influence of the interfacial strength on the damage behaviour, demonstrating that laminated glass is safer than the monolithic glass. It also shows that the FEM/DEM modelling and the new mixed-mode (I+II) model is applicable and provides realistic simulations.
Finite Element Analysis for the Upper Beam of 21MN Ceramic Press
Authors: Pan Yuan
Published: May 2014

Full-automatic hydraulic press is widely used in ceramic industry for pressing the adobe of all kinds of specific ceramic tiles, so it is also referred to as ceramic press. The upper beam is one of the most critical stressed members of the ceramic press. The paper took 21MN ceramic press as the research object, completed the finite element static analysis of its upper beam. First established the three-dimensional model of the beam by CAD software Pro/ENGINEER, and then imported the model into CAE software ANSYS and analyzed the stress and strain distribution in detail. The results can provide some useful reference for ceramic press design and optimization.
Research on Special Purpose Machine Tool Used for Ladder-Shaped Micro-Hole Automation Machining
Authors: Zhou Yang , Fu Xiao Dong , Feng Pei , Yang Chong Chang
Published: May 2014

this paper introduced the existing ladder-shaped micro hole machining method, analyzed the existing problems of present micro hole machining equipment; solved some key problems such as how to clean up the iron filings in micro blind holes rapidly and completely, compensate tool wear and other problems; And finally developed a special purpose machine tool for machining ladder-shaped micro hole, which can achieve fully automated machining.
Effect of Biomimetic Surface Morphology on Bending Fatigue Properties of Gear
Authors: Lv You , Sun Li Na , Zhang Xiu Fang , Xiu Wen Cui , Lei Li Qun
Published: May 2014

In this paper, an experimental research on the influence of the biomimetic surface morphology on the bending fatigue resistance of gear is carried out. The biomimetic surface morphology was prepared on the gear surface by a 4.5-kW Nd:YAG pulsed laser. The results showed that the fatigue lives of all of the biomimetic gears were much longer than that of the as-received gear. The bending fatigue resistance was improved by the biomimetic surface morphology. The bending fatigue resistant mechanism of biomimetic gear is discussed.
Study on the Design of Venturi Scrubber on Metal Mine
Authors: Wang Shi Bin , Chen Ri Hui , Meng Xiang Yun
Published: May 2014

Venturi scrubber is a high-efficiency wet dust collector,and has a high capture efficiency for small solid particles. Applied to metal mines, the venturi scrubber not only eliminate the mine dust in the processes of mining and driving, but also can capture the diesel exhaust particles effectively in theory. Then the air in the mine has been purified and the staff can keep away from the harm of mine dust and diesel exhaust particles. Based on the results of this research from the predecessor, the paper design a reasonable set of pilot programs for mine workers.
Calculation and Analysis of Minimum Turning Radius of Articulated Electric-Wheel Material-Carrier Based on ADAMS
Authors: Li Shuang Long , Xiong Wei
Published: May 2014

Calculate the minimum turning radius of articulated material-carrier in theory, and establish a full-vehicle model for motion simulation to obtain the minimum turning radius with the application of virtual prototype software ADAMS, then compare the theoretical value with simulation value. Analyze the relationship between the position of articulated point in the material-carrier and the minimum turning radius.
Improved Structure of Intermediate Shaft Device of JC-300 Winch
Authors: Xie Huai Bei , Wei Chao Kun , Jiang Hong , Hu Ya Lin
Published: May 2014

JC - 300 winch is applicable to many transportation vehicles scheduling when loading and unloading of goods ,it also can be used for hauling heavy objects.but as the working process position of intermediate shaft opinion is uncertainty ,top phenomenon between slider and intermediate shaft pinion during the meshing process may be easily occurred,this will make the slide block jammed while the intermediate shaft pinion is unable to rotate properly.the paper propose to add guide wheels in intermediate shaft pinion and slide block respectively, and use ansys software to analysis the strength of guide wheel shaft after scheme feasible analysis.
Design of Combined Switching Valve of High Pressure Abrasive Jet Mixing System
Authors: Chen Lei , Wang Cheng Jun , Song Hai Lang , Han Dong Dong , Chang Juan
Published: May 2014

In order to simplify the structure of switching valve groups and reduce the failure rate in the high pressure abrasive jet mixing system, a combined switch valve for the system has been designed. The combined switching valve can implement a motor to drive four spools for two open and two closed electric control switch of high pressure abrasive jet mixing system, which has the advantages of compact structure, small space occupation, convenient control and high reliability.
Thermal Analysis Based on Finite Element Analysis for Motorized Spindle
Authors: Yu Dong Man , Hu Yan Hui , Wang Di , Li Xiao Jing
Published: May 2014

High-speed motorized spindle is a key device of modern industry and has been widely used in numerical control machine. Temperature distribution, speed control loading characteristics, precision maintenance, liberation intensity and circumgyration error are not only the key demand of motorized spindle's capability but also an important index to evaluate it's performance. Therefore, this study has detailed described the main structure of motorized spindle. The basic structure and working principal was introduced, and then demonstrated a series of models and specifications of motorized spindle. The finite element model of high-speed motorized spindle was built up and carried out thermal analysis to study the heat generation and heat transfer. With the help of ANSYS finite element software, the temperature field distribution and the temperature rise condition for motorized spindle were analyzed. The result shows that the front bearing has a higher temperature than that of back bearing. The maximum temperature of inner ring is bigger than that of outer ring. The results contribute to selection of appropriate bearing for motorized spindle system.
Optimization Design of Muffler Based on the Theory of Orthogonal Test
Authors: Xu Xiao Mei , Jia Han , Zhu Yun Peng , Shi Jing
Published: May 2014

The theory of orthogonal test provides a new design idea for the design of muffler with complicated structure. The second baffle plate position, outlet pipe perforation rate, connecting pipe diameter and perforation rate of a heavy vehicle exhaust muffler are chosen as the level factors. The sum of the transmission loss in the frequency range from 510Hz to 640Hz is chosen as the evaluation index. Based on the orthogonal test theory, GT-POWER software is used to analyze the evaluation index under different level factors. According to the orthogonal analysis table, optimization of the internal structure for the muffler is carried out. The optimized results show that attenuation performance of the optimized muffler in the optimized band is superior to the original muffler and the frequency bands allowing noise to pass through is significantly reduced.
Research on Vibration with Advanced Lubricants for Chiller
Authors: Cui Hai Hong
Published: May 2014

Reducing noise and vibration is an increasingly important objective for designers and users of a wide range of mechanical system. Lubricant can contribute to reduction of overall noise and vibration generated by machines, both by reducing generation of acoustic energy in lubricated contacts and by modulating the transmission of vibration through the lubricant. This paper outlines various mechanisms by which the lubricant may affect the generation and transmission of acoustic vibration. Examples from the area of refrigeration compressor lubrication are presented, demonstrating that correct design and selection of lubricant can have a significant impact on noise and vibration.
Reliability Assessment Calculation of the Automobile Transmission System
Authors: He Xue Hong , Zhang Guo Wei , Liu Guo Peng , Xie Li Yang
Published: May 2014

In order to improve reliability of automobile transmission system and its running stability, this paper raises a reliability assessment calculation method. This method considers dependent failure of the parts, material strength degradation with increasing load times and uncertainty of load times in micro and macro scopes to explore main factors affecting the system reliability. The feasibility of this method has been validated by the example analysis. As a result , material properties of each gear parts, torques and load times play key parts in reliability of the system.
Design and Simulation of Pedal Simulator in Brake by Wire System
Authors: Zhu Wen Bo , Ji Fen Zhu , Zhou Xiao Xu
Published: May 2014

Wire of the brake pedal is not directly connected to the hydraulic environment in the braking By-wire system so the driver has no direct pedal feel. Then pedal simulator is an important part in the brake-by-wire system. A pedal force simulator was designed based on the traditional brake pedal curve of pedal force and pedal travel, AMESim and Matlab / Simulink were used as a platform to build simulation models and control algorithms. The simulation results show that the pedal stroke simulator and the control strategy meet the performance requirements of traditional braking system. It can be used in brake by wire system.
Design of Quasi Free Surface Secondary Optical Lens for LED Auto Taillights
Authors: Wang Kun , Li Jian
Published: May 2014

Owing to its high energy efficiency, high color rendering and long life, LED lamps are promising in the field of Lighting. However, it is much more important to design a secondary optical lens for the LED lamps to obtain good output efficiency and a good light distribution pattern than to light the lamps. In the field of auto lamps, LED has more advantages than the traditional lamps. In this paper, we proposed and developed a secondary optical lens design blueprint for LED auto taillights. A quasi free surface based on the cone lens for auto taillights was designed and the desired illumination was achieved. We present the design procedure of the lens. The simulation of the auto tail-lights is carried out in Tracepro 7.0. The results show that the lens can rearrange the luminous flux accurately and reasonably. An auto taillight with a uniform and rectangular luminous flux distribution is obtained
Design and Implementation of Data Acquisition System Based on FPGA and High-Speed AD
Authors: Li Zhi , Chen Da Hua
Published: May 2014

High speed analog signals output by test object in the field of testing and controlling is typical. This paper designed a high-speed AD data acquisition system responding to this situation. In the design of the system, data is first conditioned by the analog channel. FPGA is then employed to receive, decelerate, reorganize and store the high-speed LVDS data output by AD. Data is displayed in computer after being collected by ARM from FGPA. Real circuit designing demonstrated that the high-speed data acquisition system of AD based on 100M bandwidth of analog channel is workable.
Lightning Overvoltage Analysis and Calculation of 330kV Overhead Transmission Line
Authors: Zhang Xiu Bin , Wen Ding Jun , Sun Ya Ming , Chen Hong Gang
Published: May 2014

Lighting is one of the important reasons of transmission line trip accident. For 330kV and above ultra high voltage transmission line, lighting flashover more frequently occur. To reduce tripping rate effectively and fundamentally, lightning over voltage level should be analyzed besides anti-pollution flashover. In this paper, a simplified equivalent circuit model of a 330kV overhead transmission lines is established. The lightning over voltage of the transmission is analyzed and calculated. Method to reduce the lightning overvoltage is discussed.
The Classification of Grounding Method on the Low-Voltage Distribution System
Authors: Liu Chen Lei
Published: May 2014

Electricity is the foundation of modern industrial and people’s daily life,as the most basic energy. The higher desire for power supply quality and reliability has been advanced along with the rapid development of national economy.Given the importance of electrical safety in the application of electric energy,it’s necessary to be aware of electricity protective measures,especially the protective earthing ways as the indirect contact protective measures.
Orthogonal Pulse Design Based on Sinusoidal and Cosinusoidal Functions
Authors: Zhou Heng Jun , Zhao Zhi Yong , Liu Xi Guo , Mao Zhong Yang
Published: May 2014

In order to improve the bandwidth efficiency for the communication system effectively, a designing method for orthogonal pulse based sinusoidal and cosinusoidal functions is put forward. The orthogonal pulse is designed by parameter setting, sub-band division, parameter solution and pulse solution from the point signal character. The orthogonal pulse’s spectrum is mixed or overlapped in frequency domain. It can not only be formed little relative bandwidth signal, but also large relative bandwidth signal. The system bandwidth efficiency can reach 2Baud/Hz when the orthogonal pulse is used in information transmission.
Dynamic Condition Assessment of Electrical Equipments Based on Markov Prediction
Authors: Li Jian Sheng , Liang Jun , Yun Zhi Hao , Zhang Li , Zhang Feng
Published: May 2014

A novel method for electrical equipments condition assessment is proposed based on Markov prediction. Firstly, the condition representation parameters are induced according to the general volt-ampere characteristics, which can be identified by least square method. Secondly, the number of samples falling into different intervals is counted and the state transition probability matrix is calculated. Last, the distribution of parameters in future detection periods is predicted and the equipments condition is assessed by the ratio of the length of current operation time and the estimated life. Take a single phase two-winding transformer as an example, Monte Carlo simulation is used to generate the leakage inductance data and the electrical data is derived by PSCAD. The equipment condition assessment results verify the effectiveness and feasibility of this proposed method.
The Research of the Photovoltaic DC Grid-Connected Converter Applied in Flexible DC Grid
Authors: Ju Chang Bin , Wang Huan , Feng Wei , Xu Hong Hua
Published: May 2014

With the rapid development of flexible HVDC technology in China, the demand for the DC grid of new energy generation projects growth. This paper studies the topology of the DC grid photovoltaic converter, a topological scheme is proposed and detailed analysis of the topology of the work mode is presented. For the device extension problem of equipment used in high-voltage direct current power level, a connecting scheme based on modular IPOS program and a control strategy of uniform duty cycle are given. In this paper, the equivalent controlled source method for small-signal dynamic modeling is established, and the stability of the control scheme is analyzed using Bode diagram. Finally, a 10kW prototype platform topology programs is built and control strategies experimentally is verified. This paper has important reference value for the HVDC grid-connected research of new energy power generation and the research of small power scale AC-DC hybrid microgrid network.
The Test Equipment Based on Single Chip Micro (SCM) of Volt-Ampere Characteristic of CT
Authors: Liu Bai Fen , Gao Ying
Published: May 2014

Nowadays, various test equipment tend to be more intelligent, the test equipment of the volt-ampere characteristic of CT is so too. As the development of the electronics, VLSI(SCM) is manufactured. The purpose of our project is to scheme out a intelligent test system by the computer technique and the test technique. This equipment is mostly made of the SCM system and the peripheral equipment. We control the output of the digital transformer by SCM. The output voltage can make the TL494 create PWM wave. The wave is the control signal of the main circuit. The output wave of the main circuit is the sine wave, and the value of the output can be amended automatically. Compared with the traditional equipment, this equipment is smaller and use less energy, but its function is more powerful. It can be programmable. We can take it more expediently. So, this kind of equipment can be used widely in the future.
Electromagnetic Compatibility of PCB Based on Electromagnetic Simulation Methods
Authors: Yao Zhu Ting , Ge Jing Jing
Published: May 2014

With the circuit fabrication technology continues toward high-speed, high-density, low-power direction, modern circuit design techniques have changed radically. The speed improvement of digital system means rise and fall time of signals as short as possible, the improvement of frequency and edge rates will bring a series of high-speed design problems, these problems bring great challenges to the system hardware design, the correct design from logical point of view, if there is improper in the actual PCB design will lead to failure of the entire design. EMI radiation of PCB is analyzed, EMC simulation of PCB and optimizing improved are finished. The PCB electromagnetic compatibility is analyzed by using Protel 99SE and Ansoft Designer 2.2 software, and simulation result indicates optimizing design is correct and effective.
Study on Compressing Data for Three-Phase Power Based on Adaptive Two-Dimensional Wavelet Packet
Authors: Liu Mei Ju , Zhang Xu , Bai Zi Long , Gu Meng Hua
Published: May 2014

This paper presents a method based on adaptive two-dimensional wavelet packet for three-phase power quality data. In this paper, we shall briefly introduce the method of dq0 transformation. First, the original data is converted by the method of dq0 transformation, its purpose may be to eliminate redundancy between the three-phases alternating data, then change the one-dimensional date converted into a two-dimensional matrix by the integral multiple of cycles, which aims to eliminate redundant between cycles. Finally, use the method of two-dimensional adaptive wavelet packet decomposition, image SPIHT coding and DEFLATE coding to compress the data. The simulation result shows that the algorithm effectively compress the three-phase power quality data, and it has a good compression effect.
The Researching of a Power Supply Design Scheme for T/R Assemblies
Authors: Wang Wei Chang , Zhao Jin Cheng
Published: May 2014

This paper presents a distributed power supply scheme for T/R assemblies which are the key pate of the active phased radar. Based on the analysis of the characteristics and design difficulties of T/R assemblies, the power supply uses the energy storage capacitor to provide the high peak current during the pulse, and uses the way of distributed power supply scheme to improve the reliability of power supply system. The power supply designed using this method can achieve load sharing for power supply Assemblies and effectively improve the accuracy of supply voltage.
Research on EMC Evaluation of Shipborne Electronic Equipment
Authors: Mao Jian Zhou , Wang Yan Hui , Si Nan , Xia Hui Cheng
Published: May 2014

The paper addresses the central issues of electromagnetic compatibility (EMC) evaluation of shipborne electronic equipment. The mutual disturbance between equipments would show important influence on the capability of the devices, slight interferer may degrade the performance, severe interferer would make the equipment out of work even cause false action of weapon system, therefore, how to quantitatively describe the EMC state of equipment and harmonize the EMC assessments correctly is the key consideration of the warship’s commander and the combat system designer. Take the advantage of norm theory this paper proposed a method to evaluate the EMC state of the shipborne electronic equipment quantitatively, which would meet the requirements both warship’s EMC design and commander’s campaign operation.
Study on Mercury Emission Control of Dust Removal System for 300MW Coal-Fired Units
Authors: Wang Fan , Zhu Jin Wei , Cao Qing , Wang Xiang Feng , Zhang Fan , Li Ying Ri , Wang Hong Mei
Published: May 2014

In this study we researched on the gaseous mercury removal performances of fabric filter (FF), electrostatic precipitator (ESP) and wet flue gas desulfurization (FGD) technologies on 300 MW coal-fired boilers, gaseous mercury sampling was conducted according to US EPA Method 30B and Method 29, and the changes of various forms of mercury before and after the dust removal treatment were analyzed. The results show that FF is the most effective for fine particles removal, and more than 99.5 % of the particulate mercury was removed; the gaseous mercury removal efficiency of ESP was only 30%, while the efficiency of FF was 45% or higher; the combination of FF and wet FGD could remove 63.65 % of the gaseous mercury.
Electric Vehicle Battery Pack Voltage Detection Circuit and its Error Research
Authors: Wang Yu Ming , Li Li , Lu Gao Lei , Li Chen , Tian Shao Peng
Published: May 2014

The circuit structure and the sampling principle of single battery voltage detecting circuit were introduced. Switching network timing of single voltage sampling was described, and voltage conditioning circuit parameters were calculated. There were some errors in the measurement results. Through the analysis of the main sources of the errors, corresponding correction strategy was given. The test results showed that experimental results after correction were more accurate and stable.
Study on Streaming Media Tentative Rate Control Algorithm Based on TCP-Friendly
Authors: Xu Peng , Yu Zhi Chao
Published: May 2014

In TCP-IP network environment that can’t provide a reliable guarantee of QoS, congestion and insufficient bandwidth becoming a major bottleneck in network applications, in order to prevent multimedia streaming occupied too many network resources ,leading to the traditional TCP flow can’t be normal transmission, the paper analyzes the RTP protocol QoS control and TCP congestion control mechanism ,directs the phenomenon of multimedia streaming flow seizing the traditional network resources, and proposes a tentative for streaming media rate control algorithm, effectively ensuring the multimedia streaming and traditional TCP flows to friendly coexist and fair competition.
Sensorless Control for PMLSM Based on Fuzzy Sliding Mode Observer
Authors: Lu Hua Cai , Ti Juan , Yuan Yi Ming , Wei Li Sheng
Published: May 2014

In this paper, a new sensorless control method is proposed for a permanent magnet linear synchronous motor based on Fuzzy sliding mode observer, which combines the advantages of sliding mode observer and Fuzzy controller respectively. The difference between the current estimated value and the actual current value is regarded as sliding mode function; sliding mode function (current error) and variation of the error are used as the input of fuzzy controller, and the width of the boundary layer as the output, adjusting the width of the boundary layer dynamically in real time. The simulation results show that Fuzzy sliding mode observer is able to find a balance between soft chattering and steady-state error, keep the system robustness and control precision.
Adaptive PID Switched Reluctance Motor Controller Based on Fuzzy Logic
Authors: Song Ai Juan , Lv Jiang Tao
Published: May 2014

The paper develops a fuzzy logic controller (FLC) for the switched reluctance motor (SRM).The SRM is nonlinearity, time lag, inertia, uncertainty and so on .So the SRM is not use the general feedback theory or the conventional PID controller . So that , fuzzy logic controller (FLC) is a good way . The advantage of this method is that the proposed FLC has the characteristics of robustness. Fuzzy-PID control has better adaptability and stability, less overshoot, faster response and higher precision than PID-control and general feedback theory. Fuzzy-PID is adopted to control for switched reluctance motor to obtain a high performance.
Satellite Liquid Propellant Estimate Based on Virial Equation
Authors: Wang Yu Fei , Liu Xiao Peng , Zhang Xiao Gong
Published: May 2014

The remaining liquid propellant of an on orbit satellite is an important factor to evaluate satellite’s performances and the method is generally used to estimate the volume of the remaining liquid propellant. However, the method has some errors that influence the estimation. This paper takes Virial equation to ameliorate method. By using on orbit data of two satellites, this method based on Virial Equation is validated. And the results indicate the estimation error is less, more close to the true state, and could be put into practical use.
Simulation of Control Model Based on Optimal Structure of HOPFIELD Neural Network
Authors: Liu Jing
Published: May 2014

Carbon finance is the core module of the future development of low carbon economy; it is a new type of competitive force in the construction of long-term sustainable development strategy for global financial institutions. Its development degree directly restricts the healthy development of multiple fields related to carbon finance. In this paper we firstly analyze the market structure characteristics of carbon finance based on international experience, and summary Chinese problems of carbon finance according to the domestic status. On the basis we introduce artificial neural network of P.K.Simpson, and construct the carbon financial control model based on neural network prediction. In order to verify the scientific and practicability of this model, we build dynamic behavior simulation model of carbon financial system. The simulation results show that the model can make accurate predictions on scientific decision on carbon financial system application, and the simulation results are relatively complete.
Research of Fuzzy Control System of Temperature Control Fan
Authors: Wu Xiao Long , Ke Jian Hong
Published: May 2014

Using a programmable logic controller (PLC) technology and sensor detection system,this paper establishes dynamic ventilation control system,and studies the fuzzy temperature control system through PLC control fan [1,2].Intelligent temperature control fan system can drive ventilation motor automatic open and close according to the information input of greenhouse internal environment and external environment,it can achieve the dynamic control of temperature inside the greenhouse,make the temperature of the greenhouse reach the ideal state.
The Research of the Temperature Decoupling Control Based on QDRNN in Ammonia Synthesis Converter
Authors: Lu Xiao Qing , Hao Li Jun
Published: May 2014

Considering the coupling of the bed temperature control of sections in ammonia synthesis converter, by means of the analysis for quasi-diagonal recurrent neural network (QDRNN) and the gradient descent method (GMD), a dual-variable decoupling control scheme based on QDRNN is designed in temperature control system of ammonia synthesis converter. The structure and principle of the algorithm has been illustrated in this paper. Through the comparison of simulation results, it shows that the proposed scheme has better control effect than the conventional PID decoupling control scheme.
Overview of the Latest Method and Development Direction for Dynamic Load Identification
Authors: Guan Wei , Wang Cheng , Chen D.S. , Gou Jin
Published: May 2014

The accurate load identification can ensure the security and reliability of engineering structures. Recently, this technique has attracted much attention by many scholars. This paper concludes the latest load identification technologies at home and abroad, which include the machine learning methods based on neural network method, support vector machine (SVM) and optimization methods, and the wavelet transform method. In addition, their advantages and disadvantages and the applicable ranges are also discussed. Finally, the prospect of dynamic load identification was discussed, so as to extend the application area of load identification. n�GeZ����6�span>dentification
A Robust Algorithm for Multiple Moving Targets Tracking
Authors: He Yang Ming , He Yan Qiu , Xiong Guang Yao , Zhu Ming Feng
Published: May 2014

An algorithm for multiple moving targets tracking in computer vision is put forward in this paper. The association between the tracking chains and new targets detected is mainly discussed. There are four situations. Among them, the most complicated is that several tracking chains exist and several new targets are detected. The distance between new targets and old targets is used to determine whether they are the same targets. When the tracking chain is found broken, it is seen that the target has passed the monitoring area, and begins to count. In the paper, the program code is shown, too. In the end of the paper, real images on the spot are used to test the algorithm. Its good effect can be proved from practical spot.
A Randomly Permuted Fourier Measurement Matrix for UWB-PPM Signals
Authors: Yin Hai Bo , Yang Jun An , Wang Wei Dong
Published: May 2014

Compressed Sensing is likely to provide an effective way for lowering the extremely high sampling speed of UWB signal while the design of CS measurement matrix is of great significance for reducing the number of observations and hardware costs as long as improving the reconstruction accuracy. In this paper, with the combination of the structural features of the Fourier matrix and the idea of entry permutation of determined matrices, we propose a new measurement matrix of which the Fourier transformed entries are randomly permuted. Simulation results show that the same algorithm has a better reconstruction performance with the proposed measurement matrix rather than Gaussian/ Bernoulli matrix.