bluuebunny/crossref_metadata_2025 huggingface dataset:
Unipolar Switching Behavior in Highly Crystalline Hexagonal Boron Nitride
Authors: Jain Nikhil , Jacobs-Gedrim Robin B. , Yu Bin
Published: May 2014

We observed resistive switching in highly crystalline layered insulator hexagonal boron nitride (h-BN) under electric field in a nano-device configuration. Two distinct resistive states were observed in the 2D material heterostack. Electrical characterization using capacitance-voltage approach further revealed the role of h-BN as the active switching element. The switching behavior could be attributed to substitutional doping of h-BN under electric field present in the active region, possibly resulting in the formation of multi-element complex in which electrical conductivity depends on the amount of substituted dopant in the boron nitride crystal lattice. Since switching is observed independent of the direction of electric field, it is unipolar in nature. The observed memristance phenomenon in layered insulator may be potentially used in the form of NVM, providing possible direction to implement information storage or reconfigurable logic applications.
Grupos de Interação Social (GIS): estratégia de empowerment para pessoas com epilepsia
Authors: Fernandes Paula T. , Min Li Shih , Ling Li Hui , Correa Carlos , Barros Nelson Felice , Li Li Min
Published: May 2014

INTRODUÇÃO: O manejo da epilepsia vai além de controle das crises e, para uma abordagem integrativa, começamos a trabalhar com os Grupos de Interação Social (GIS) na epilepsia. OBJETIVO: Realizar grupos em profissionais da saúde e educação para que eles possam se apoderar desta dinâmica para depois aplicá-los em suas comunidades, locais de trabalho, com seus pacientes e equipe de trabalho. METODOLOGIA: foram realizados dois GIS - com 21 profissionais da área social, saúde e educação na cidade de Pedreira. Para avaliar mudanças, foram aplicados questionários validados (Questionário de Autoestima, Questionário de Resiliência, Inventário de Habilidades Sociais e Escala de Estigma na Epilepsia) antes e depois dos GIS. RESULTADOS: Os grupos permitiram aprender mais sobre epilepsia, trocar experiências e contribuir para o crescimento pessoal e profissional, reforçando a solidariedade e a prática da cidadania. Além disso, o uso da Medicina Tradicional Chinesa reforçou a visão do ser humano como ser integral. Os questionários aplicados no início dos grupos (pré-teste) e ao final (pós-teste) mostraram mudanças positivas. CONCLUSÕES: Pôde-se observar uma melhora em todos os itens avaliados, mostrando que os sujeitos, mesmo sendo profissionais, puderam melhorar suas habilidades sociais e com isso, seu poder de resiliência. A aplicação do GIS é prática, com baixos custos de operacionalização, o que permite sua utilização em locais diversos e pode ser útil para outras situações ou condições crônicas com impacto semelhante ao da epilepsia.
Weight Charts of Infants Dying of Sudden Infant Death in England
Authors: Scheimberg Irene , Ashal Husna , Kotiloglu-Karaa Esin , French Paul , Kay Philippa , Cohen Marta C.
Published: May 2014

The organ weights in cases of sudden infant death syndrome (SIDS) and undetermined deaths in previously healthy infants do not correspond to “the normal range” of organ weights in international standard charts for infants currently in use in some institutions. The aim of our study was to ascertain the organ weights of infants dying suddenly and unexpectedly in England and for whom a cause of death was not found, therefore falling under the category of SIDS or undetermined. We collated the organs weights from 2 institutions covering between them the South East and North of England including London, Yorkshire, and Derbyshire. The cases from The Royal London Hospital were autopsied between 1997 and 2013, and the cases from Sheffield Children's Hospital were autopsied between 2006 and 2013. There were 188 babies who had been born at term (62 female and 126 male) and 26 ex-premature babies (15 female and 11 male). Organs of male babies were slightly heavier than those of female babies but as there was no significant differences male and female babies were considered together. Comparison with standard charts (from 1932 and 1962) and with more recent charts confirmed the discrepancy between the older charts commonly in use with more recent measurements, including ours. The main reason for these differences is that babies in the recent charts were previously healthy babies with no long term disease and improved in the health of the population.
Evaluating the Efficiency of Methods to Recruit Asian Research Participants
Authors: Park Hyunjoo , Sha M. Mandy
Published: May 2014

Few empirical studies have evaluated the efficiency of recruitment methods to recruit non- English-speaking research participants. We attempt to fill this research gap by conducting a systematic evaluation using recruitment data from a large cognitive testing study that pretested the translations of the American Community Survey. In our study we contacted 1,084 Chinese and Korean speakers to identify those who spoke little or no English. We measured the efficiency of the recruitment methods (newspaper advertisements, flyers, online communication, and word of mouth) using four criteria: time spent, outreach capacity, screener completion, and eligibility rate. We also examined differences in recruitment efficiencies by recruiters and sublanguage groups. Among the recruitment methods examined, newspaper advertisements were most efficient in reaching a larger number of Asians while using the least amount of recruiters’ time. For recruiting non-English speakers, word of mouth by recruiters with strong ties to the ethnic community worked best.
Testing Of Energy Meters Under Three-Phase Determined And Random Nonsinusoidal Conditions
Authors: Olencki Andrzej , Mróz Piotr
Published: May 2014

Electric energy meters are designed to account energy under sinusoidal and nonsinusoidal conditions, because both, old and new standards for energy meters require testing their accuracy under different conditions. The latest EN 50470 standard increases the range of meter testing under nonsinusoidal conditions, introducing new shapes of test signals such as the phase fired waveform or the burst fired waveform. This paper discusses calibration problems of electronic revenue energy meters for direct connection and for connection through current transformers, and it proposes a new calibration procedure which reproduces normal operating conditions better: three-phase configurations of measurement systems, load range during meter testing or shapes of test signals. Recently, modern Electrical Power Standards, also known as Power Calibrators, enable automatic testing of various types of electrical devices, including electricity meters in their normal operating conditions. This article presents examples of single and multi position fully automatic test systems, which employ Power/Energy Calibrator from Poland as the precision source with programmed waveforms of three phase voltages up to 560 V and currents up to 120 A conforming to EN 50470, or with random waveforms generated by PC software random wave generator. Measurement uncertainty of the energy meters under different nonsinusoidal conditions using a test system with reference to accuracy of the power calibrator or to the reference meter, are discussed.

Comparative analysis of test results for different shapes of voltage and current signals is presented in the conclusions of this paper.
High-Efficiency Carrier Frequency Estimation Algorithm for Real-Time Multi-Domain Communication Signal Analysis
Authors: Wang Qian , Yang Xiaomei , Yan Xiao , Qin Kaiyu
Published: May 2014

Based on real-time multi-domain communication signal analysis architecture, a high-efficiency blind carrier frequency estimation algorithm using the power spectrum symmetry of the measured modulated signal is presented. The proposed algorithm, which utilizes the moving averaged power spectrum achieved by the realtime spectrum analysis, iteratively identifies the carrier frequency in according to the power difference between the upper sideband and lower sideband, which is defined and revised by the estimated carrier frequency in each iteration. When the power difference of the two sidebands converges to the preset threshold, the carrier frequency can be obtained. For the modulation analysis, the measured signal can be coarsely compensated by the estimated result, and the residual carrier frequency error is eliminated by a following carrier synchronization loop. Compared with previous works, owing to the moving averaged power spectrum normalization and the smart iterative step variation mechanism for the two sidebands definition, the carrier frequency estimation accuracy and speed can be significantly improved without increasing the computational effort. Experimental results are included to demonstrate the outstanding performance of the proposed algorithm.
Dual-Axis Test Rig for Mems Tilt Sensors
Authors: Łuczak Sergiusz
Published: May 2014

The paper addresses the problem of experimental studies of miniature tilt sensors based on low-range accelerometers belonging to Microelectromechanical Systems (MEMS). A custom computer controlled test rig is proposed, whose kinematics allows an arbitrary tilt angle to be applied (i.e. its two components: pitch and roll over the full angular range). The related geometrical relationships are presented along with the respective uncertainties resulting from their application. Metrological features of the test rig are carefully evaluated and briefly discussed. Accuracy of the test rig is expressed in terms of the respective uncertainties, as recommended by ISO; its scope of application as well as the related limitations are indicated. Even though the test rig is mostly composed of standard devices, like rotation stages and incremental angle encoder, its performance can be compared with specialized certified machines that are very expensive. Exemplary results of experimental studies of MEMS accelerometers realized by means of the test rig are presented and briefly discussed. Few ways of improving performance of the test rig are proposed.
Velocity Measurement using the Fdoa Method in Ground-Based Radio Navigation System
Authors: Sadowski Jarosław
Published: May 2014

Velocity is one of the main navigation parameters of moving objects. However some systems of position estimation using radio wave measurements cannot provide velocity data due to limitation of their performance. In this paper a velocity measurement method for the DS-CDMA radio navigation system is proposed, which does not require full synchronization of reference stations carrier frequencies. The article presents basics of FDOA (frequency difference of arrival) velocity measurements together with application of this method to an experimental radio navigation system called AEGIR and with some suggestions about the possibility to implement such FDOA measurements in other kinds of asynchronous DS-CDMA radio networks. The main part of this paper present results of performance evaluation of the proposed method, based on laboratory measurements
Field Observations with Laser-Induced Fluorescence Transient (LIFT) Method in Barley and Sugar Beet
Authors: Raesch Anna , Muller Onno , Pieruschka Roland , Rascher Uwe
Published: May 2014

The laser-induced fluorescence transient (LIFT) method is a non-invasive remote sensing technique for measurement of photosynthetic performance of plants under laboratory and field conditions. We report here a long-term comparative study to monitor the performance of different cultivars of barley and sugar beet during the growth season of these crops. The LIFT measurements provided useful results about photosynthetic light use efficiency on selected leaves in the canopy of the studied crops. The different canopy architectures, with different optical properties, influenced the LIFT measurements.
Designation of Environmental Impacts and Damages of Turbojet Engine: A Case Study with GE-J85
Authors: Altuntas Onder
Published: May 2014

Between the troposphere and stratosphere layers of the atmosphere is a critical zone for collecting emissions and negative effects on the Earth (ecological, humanity, and resources). Aircrafts are the main causes of the impacts in this layer. In this study, environmental effects (Damages, Specific Fuel Consumption Impact-SFCI and Thrust Environmental Impact-TEI) of different fueled (Jet-A and Liquid Hydrogen-H2) jet engines (a case study with GE-J85) are investigated. This comparison was made between 7000–10,000 m altitude and 0.7–1.0 Mach. The maximum damages were found to be 82.44 PDF∙m2∙yr (Potentially Disappeared Fraction from one m2 area during one year), 1.75 × 10−3 DALY (disability-adjusted life years), and 8100 MJ Surplus for Ecosystem Quality, Human Health and Resources, respectively, at Jet-A fueled aircraft, 1 Mach, and 7000 m altitude. Additionally, the maximum SFCI was calculated as 344.03 mPts/kg at H2-fueled, 0.7 Mach, and 10,000 m; the minimum TEI was calculated as 13.78 mPts/N at H2-fueled aircraft, 0.7 Mach, and 9000 m. The best environmental (low specific fuel consumption and thrust impacts) flight situations were found in this study at a high altitude and a low Mach number.
Applications of Liquid-Phase Microextraction in the Sample Preparation of Environmental Solid Samples
Authors: Prosen Helena
Published: May 2014

Solvent extraction remains one of the fundamental sample preparation techniques in the analysis of environmental solid samples, but organic solvents are toxic and environmentally harmful, therefore one of the possible greening directions is its miniaturization. The present review covers the relevant research from the field of application of microextraction to the sample preparation of environmental solid samples (soil, sediments, sewage sludge, dust etc.) published in the last decade. Several innovative liquid-phase microextraction (LPME) techniques that have emerged recently have also been applied as an aid in sample preparation of these samples: single-drop microextraction (SDME), hollow fiber-liquid phase microextraction (HF-LPME), dispersive liquid-liquid microextraction (DLLME). Besides the common organic solvents, surfactants and ionic liquids are also used. However, these techniques have to be combined with another technique to release the analytes from the solid sample into an aqueous solution. In the present review, the published methods were categorized into three groups: LPME in combination with a conventional solvent extraction; LPME in combination with an environmentally friendly extraction; LPME without previous extraction. The applicability of these approaches to the sample preparation for the determination of pollutants in solid environmental samples is discussed, with emphasis on their strengths, weak points and environmental impact.
Structure of Microgels with Debye–Hückel Interactions
Authors: Kobayashi Hideki , Winkler Roland
Published: May 2014

The structural properties of model microgel particles are investigated by molecular dynamics simulations applying a coarse-grained model. A microgel is comprised of a regular network of polymers internally connected by tetra-functional cross-links and with dangling ends at its surface. The self-avoiding polymers are modeled as bead-spring linear chains. Electrostatic interactions are taken into account by the Debye–Hückel potential. The microgels exhibit a quite uniform density under bad solvent conditions with a rather sharp surface. With increasing Debye length, structural inhomogeneities appear, their surface becomes fuzzy and, at very large Debye lengths, well defined again. Similarly, the polymer conformations change from a self-avoiding walk to a rod-like behavior. Thereby, the average polymer radius of gyration follows a scaling curve in terms of polymer length and persistence length, with an asymptotic rod-like behavior for swollen microgels and self-avoiding walk behavior for weakly swollen gel particles.
A Measuring System for Well Logging Attitude and a Method of Sensor Calibration
Authors: Ren Yong , Wang Yangdong , Wang Mijian , Wu Sheng , Wei Biao
Published: May 2014

This paper proposes an approach for measuring the azimuth angle and tilt angle of underground drilling tools with a MEMS three-axis accelerometer and a three-axis fluxgate sensor. A mathematical model of well logging attitude angle is deduced based on combining space coordinate transformations and algebraic equations. In addition, a system implementation plan of the inclinometer is given in this paper, which features low cost, small volume and integration. Aiming at the sensor and assembly errors, this paper analyses the sources of errors, and establishes two mathematical models of errors and calculates related parameters to achieve sensor calibration. The results show that this scheme can obtain a stable and high precision azimuth angle and tilt angle of drilling tools, with the deviation of the former less than ±1.4° and the deviation of the latter less than ±0.1°.
A Pediatrician's View
Authors: Hoekelman Robert A
Published: May 2014

Woe Is Me! What Can We Do About Drugs?
Analysis of Soil Penetration Problems by High-Order Elements
Authors: Nazem Majidreza , Carter John Phillip , Kardani Mina
Published: May 2014

This paper addresses the application of high-order elements in the analysis of soil penetration problems, particularly those involving inertia forces and large deformations. Among others, 15-node triangular elements are formulated within an Arbitrary Lagrangian-Eulerian finite element method. Preliminary studies indicate that high-order elements can significantly decrease the analysis time without significant loss of accuracy.
Molecular Dynamics Simulation of the Deformation of Single Crystal Gallium Arsenide
Authors: Chen Y.H. , Huang Han , Lu Ming Yuan , Wu Y.Q. , Fang Feng Zhou , Hu X.T.
Published: May 2014

Three-dimensional molecular dynamics (3D MD) simulation was carried out to investigate the deformation of single crystal gallium arsenide (GaAs) during nanoindentation. Tersoff potential was used to simulate the atomistic interaction under an extremely low load of indentation. The coordination number and atomic displacement were studied and the cross-sectional profiles of the simulated indent were examined. The simulation results revealed that the lattice deformation of GaAs was influenced by polarity, showing distinct patterns on different crystalline planes. Slip band and dislocation were found to be the dominant deformation phenomena.
Hygro-Thermal Modelling of Concrete Exposed to High Temperatures
Authors: de Burgh James M. , Valipour Hamid R. , Foster Stephen J.
Published: May 2014

As part of an ongoing research project into the numerical prediction of high temperature hygral processes in concrete and fire induced spalling, a fully coupled hygro-thermal model has been formulated for predicting the behaviour of concrete at high temperatures. The hygro-thermal model is a mathematical model for predicting the behaviour of concrete at high temperatures, treating the concrete as a multi-phase semi-saturated porous material. A numerical simulation of a one-dimensional heating experiment performed on an unreinforced concrete slab is presented, demonstrating the effectiveness of the model. A brief discussion of the main hygral processes is presented, in addition to a discussion of numerical challenges arising from the numerical implementation.
An Efficient Finite Element Modeling of Composite Stiffened Shells
Authors: Sheikh Hamid , Huang Liang
Published: May 2014

This paper presents an efficient finite element modeling technique for stiffened composite shells having different stiffening arrangements. The laminated shell skin is modeled with a triangular degenerated curved shell element having 3 corner nodes and 3 mid-side nodes. An efficient curved beam element compatible with the shell element is developed for the modeling of stiffeners which may have different lamination schemes. The formulation of the 3 nod degenerated beam element may be considered as one of the major contributions. The deformation of the beam element is completely defined in terms of the degrees of freedom of shell elements and it does not require any additional degrees of freedom. As the usual formulation of degenerated beam elements overestimates their torsional rigidity, a torsion correction factor is introduced for different lamination schemes. Numerical examples are solved by the proposed finite element technique to assess its performance.
Application of PDS-FEM for Simulating 3D Wing Crack Growth
Authors: Wijerathne M.L.L. , Hori Muneo , Okinaka T. , Sakaguchi Hide
Published: May 2014

3D wing crack growth is not a well understood phenomenon, although it is one of the key mechanisms of the failure of brittle materials under compression. Using PDS-FEM, we simulated the growth of 3D wing cracks emerging from pre-existing cracks in blocks of brittle linear elastic solids, under compression. The complex 3D wing crack profiles are reproduced with PDS-FEM, which uses non-overlapping shape functions of conjugate geometries to approximate functions and their derivatives. PDS-FEM provides numerically efficient failure treatment for modeling 3D cracks, making use of the numerous discontinuities in the approximated displacement field. Large scale models with several million elements are used to reproduce the experimentally observed details of wing crack profiles. The bending of crack surfaces at the tip of mode-I regions, extension of wing cracks and the growth of tensile openings or petal cracks at mode-III regions are reproduced, demonstrating the applicability of PDS-FEM for studying 3D wing crack growth phenomena.
Automated High Quality Isosurface Modeling Technique for Iterative Two-Phase Problems
Authors: Chang Che Cheng , Li Qing
Published: May 2014

While smooth isosurface and the subsequent body mesh construction is a well-developed modeling technique and widely used in medical imaging and engineering modeling, it is rarely performed in transient analysis and other iterative procedures due to relatively high computational cost. Voxelized modeling is often used as an alternative for simplicity at a cost of numerical accuracy. To overcome this problem, an isosurface modeling technique is developed in this paper to enable its seamless integration into iterative processes. This approach involves a rapid construction of closed isosurfaces using the Marching Cubes methods and a selective clean-up operation to smooth the surface mesh. This technique generates high quality isosurface meshes with clearly defined 3D domains and boundaries, which in turn provide a suitable foundation for the finite element analysis of two-phase problems. Its robustness, flexibility and suitability for applications in medical imaging and topology optimization are also demonstrated in this paper.
Application of Evolutionary Structural Optimisation; Reinventing the (Bicycle) Wheel
Authors: Merten Errol A.
Published: May 2014

This paper reports the application of Evolutionary Structural Optimisation (ESO) to minimise the weight of a bicycle wheel rim. Two finite element models were developed to analyse the rims internal structure. The internal structure of a bicycle wheel rim consists of two walls connected by a rounded spoke bed, and a horizontal spar. One model was constructed with linear plate elements and suggested material should be distributed around the spoke bed and away from the rim walls, however inaccuracies were found in the spar section. ESO of the second model, consisting of linear brick elements presented similar results but modeled the spar section accurately. Results suggested that ESO applied to bicycle wheel rims can improve the performance of the wheel through weight reduction. These findings present a simple example to engineers who wish to use ESO for improvements to the material distribution of any hollow shell structure.
Prepared Patterned Magnetic Composite Microspheres by Emulsion Polymerization
Authors: Yin Rong , Zhao Ji Li
Published: May 2014

The patterned magnetic composite microspheres with Fe3O4as core and styrene polymer as shell have been prepared by emulsion polymerization, while the size of microspheres is about 150-200nm. The composite microspheres were characterized by FT-IR, TEM, and TG et al. The measurement results showed that: the magnetic composites were orderly arranged to form a straight line, rhombus, triangle, five-rings-shaped, plum-shaped, six-membered ring geometry by own magnetic action. The structure of microspheres was spherical, the size was uniform and performance is stable.
Localized Model to Segmentally Estimate Miles per Gallon (MPG) for Equipment Engines
Authors: Luo Jiu Lin , Luo Hao Jing , Li Ai Min , Wang Hao Han
Published: May 2014

In this paper, we built a localized regression model to estimate the miles per gallon (MPG) characteristic for equipment engines based on a serious physical features of this engine. First, we statistically viewed these parameters to build up a basic understanding of the data we collected. Then, with the belief that engines with similar characteristics will perform similarly, we proposed a novel localized model with a novel optimal function based EM algorithm and a novel self-adjusted optimal clustering algorithm to estimate MPG based on the other fully studied engines with similar physical features.
Research on the Influence of NС Quick-Point Grinding Parameters to Complex Rotator Surface Roughness
Authors: Wang Kai , Sun Wan Chen , Nie Feng Ming , Wu Qing Tang , Wu Huan , Li Shan
Published: May 2014

It studies the influence of linear speed of grinding wheel and rotational speed of workpiece to complex rotator surface roughness. Using self-designed NC quick-point grinding machine do the grinding test at different linear speeds of grinding wheel and different rotational speeds of workpiece, gained the relationship curve between the linear speed of grinding wheel, rotational speed of workpiece and complex rotator surface roughness. The test results show that using quick-point grinding technology can grind multiple external cylindrical and cone-shaped surfaces by only one time fixing, it can get 0.025um surface roughness in a reasonable condition of the grinding parameters. During point grinding process, higher wheel speed gets better surface roughness, higher workpiece shaft speed gets worse surface roughness.
Structural Strength and Modal Analysis of Heavy Truck Driving Axle Housing
Authors: Ma Teng Fei , Wang Kai Song
Published: May 2014

The automobile drive axle housing is an important safety component in vehicle. The 3D model of the drive axle housing is established in CATIA,Based on the actual use conditions for a heavy truck drive axle housing, this paper used finite element analysis software ANSYS to analyze the strength, stiffness and modal of the axle housing, which results show that the design of the axle housing is rational. These results of static analysis and modal analysis can provide some references for the development of new products and the structure optimization design in the future.
Simulation of New Wet Duster’s Nozzle Based on Fluent
Authors: Tang Shan Shan , Wang Kai Song , Wei Chao Kun , Ma Teng Fei
Published: May 2014

Overweight of dust concentration is a common problem happened in most coal mine that not only affects workers’ normal work ,but also brings a great potential safety hazard to mine.New wet duster’ operating principle is that wind pressure and water pressure which generated in working surface pipeline network go through the nozzle jet and produce negative pressure leading the dust into dust catching pipe, and then the dust removed.According to optimizing the nozzle structure can increase spray’s cone Angle inside the shower nozzle,then the dust removal ability will be improved.The paper built the nozzle’ 3D model and the water’ the river basin model in SolidWorks ,then meshed them in Gambit and finally analysis the pressure and nozzle size’s influence on fluid’s pressure and velocity with Fluent’s flow field simulation.
Optimizing Parameter of Cutting Anchor-Bolt by Orthogonal Experiment
Authors: Jiang Hong , Wei Chao Kun , Hu Ya Lin
Published: May 2014

Anchor bolt is widely used in coal production, but it is uneasy to unload the anchor bolt sometime while the common cutting methods have lots of inferiors. The paper proposes the application of pre –mixed abrasive water jet abrasive water jet technology to the cutting of anchor bolt for this problem. According to the experiment of cutting anchor bolt, studying the selected parameters’ cutting impact by orthogonal experiment, the cutting parameters are optimized.
Finite Element Analysis for Supporting Structure Based on COSMOS
Authors: Yu Dong Man , Li Cheng Si , Wang Di , Li Xiao Jing
Published: May 2014

Hydraulic components are key components of hydraulic press, its design quality directly affect the performance of the host and service life. If the improper design, premature failure will cause large economic loss. So the modern design method to structure design, hydraulic components can improve the service life, increase the economic benefit is of great significance. Then Solidworks software is employed to establish the geometric model, through the interface with finite element software input into the finite element analysis software, the corresponding finite element analysis model is established. At last, through the software to the linear static analysis, the model to obtain the mechanical properties of the hydraulic components, it has reference significance to improve the design.
Dynamic Simulation and Structure Optimization of the Folding Hoistable Mast Based on Adams
Authors: Gao Qi Sheng , Gu Hai Tao , Hu Zhi Qiang , Zheng Rong , Lin Yang
Published: May 2014

In order to improve the safety and the dynamic stability of the hoistable mast, the method of parametric optimization was introduced and the dynamic model was established by the multi-rigid-body dynamic analysis soft of Adams in the beginning of the product design. Then, the dynamic simulation and the structure optimization were carried out. It was shown that the maximum force on the primary oil cylinder was reduced by 10%, the maximum force on the secondary oil cylinder was reduced by 8%, the structure layout of the mast was more reasonable and the dynamic stability were improved. Also, it was proved that the optimized structure of the hoistable mast was reasonable and feasible by simulation results.
Effect of Silica Promoter on Performance of CuO-ZnO-ZrO2 Catalyst for Methanol Synthesis from CO2 Hydrogenation
Authors: Jia Miao Yao , Gao Wen Gui , Wang Hua , Wang Yu Hao
Published: May 2014

Various CuO-ZnO-ZrO2(CZZ) catalysts for methanol synthesis from CO2 hydrogenation were prepared by co-precipitation method. Small amount of silica was incorporated into CZZ catalyst to produce these modified ternary CZZ catalysts. The effects of silica on physicochemical and catalytic properties were studied by TG-DTG,XRD,BET,N2O chemisorption,H2-TPR,NH3-TPD and CO2-TPD techniques. The results show that the properties of catalysts were strongly influenced by the content of SiO2 used as promoter. The catalytic performance for methanol synthesis from CO2 hydrogenation was evaluated. The test results show that the CZZ catalyst modified with 4 wt.% SiO2 exhibits an optimum catalytic activity. The silica improves the dispersion of CuO and its modified CZZ catalysts exhibits higher specific surface area, which were confirmed to be responsible for excellent performance of the catalysts for methanol synthesis from CO2 hydrogenation.
Structural Design and Finite Element Analysis for Planet Wheel Gear System
Authors: Li Xiao Jing , Li Cheng Si , Wang Di , Yu Dong Man
Published: May 2014

Calculation the gear bottom bending strength and the gear surface contacting stress are traditional wheel gear design method. It takes a long time to design and works out parameters for gears system. Nowadays, the optimization design and reliability theory are introduced into modern engineering, we can make full use of the calculator tool to look for the best design parameter. Modern powerful finite element analysis software packages such as ANSYS are now not only an analysis tool but a design tool as well. This kind of technology makes planet wheel gear system design quantified precisely combining with physics principles in one. In the study, we designed a planet carrier with traditional method and built three dimensional full-scale model in Pro/E software. Based on finite element analysis, the finally result of stress distribution and deformation distribution is obtained. The results indicate that the design can meet the requirement.
Experimental Research on Preliminary Docking in Replenishment at Sea Using Flexible Manipulator
Authors: Yu Ying , Liu Gui Zhen , Yin Bao Lin , Yu Bo , Wu Jan Jun
Published: May 2014

In order to fulfill the requirements of docking successfully, a scheme of step-by-step docking is proposed, the implementation methods to realize initial connection and accurate docking are given, the preliminary docking mechanism of a double flexible manipulator is designed, a testing system for RP flexible manipulator is established, corresponding experimental prototype is developed, and the mechanical model for relevant flexible regulation is made up to do experimental study. The result shows that the established RP flexible system can well satisfy the requirements of initial connection in the step-by-step docking, thus proves the feasibility of the proposed scheme.
Structural Analysis of Transmission Frame of Coal-Mining Tubular Belt Conveyor
Authors: Li Xiang Xiang , Ma Qi Jiang , Wu Zi Heng
Published: May 2014

This article introduces the structure of the transmission frame, analyzes the force the frame bear and ensures the loading conditions in the strength analysis of transmission frame. In allusion to the stress situations on transmission frame of coal-mining tubular belt conveyor , this article uses the ANSYS software to analyze the stress and strain of transmission frame in given-working conditions. And the result showes strength and stiffness of transmission frame satisfy the design requirements, providing the theoretical basis for the next design and optimization of transmission frame.
Analysis and Research of Automotive Brake Performance Based on MATLAB
Authors: Zhao Chen
Published: May 2014

Based on the application of the vehicle parameters, the article analyzed the brake process and its performance by MATLAB. The article proposed analytical method and process of automotive brake ideal conditions by simulation software MATLAB. And through drawing the ideal front and rear brake force distribution characteristics, calculated and analyzed the wheel brake force, adhesion coefficient and brake strength. Also the article provided the foundations of convenient calculation method and visual analysis for automotive brake performance.
Design of the Portable Abrasive Water Jet Rescue and Fire-Fighting Device
Authors: Hu Ya Lin , Sun Zhen Zhen , Jiang Hong
Published: May 2014

In recent years, with the deepening of China's reform and opening up policy, the rapid development of the national economy and urban high-rise buildings and underground engineering increasing, many kinds of malignant fire have become increasingly complex and frequent. In the event of a fire, it may cause great loss of life, serious injuries and state property. In the absence of the necessary rescue equipment, fire brigade and emergency departments in fire and explosion engineering, engineering rescue and various natural disasters will delay the rescue, even can do nothing to rescue. This proves the forcible entry tools play a significant role in fire fighting and rescue. Therefore, the fire brigade and rescue departments should equip with efficient forcible entry tools for rescue as soon as possible.
Analysis of Electrical Field of Overhead Line
Authors: Zhou Jia , Tan Xiao Long , Wang Wen Bin
Published: May 2014

Ellipse expression is difficult to be found directly. And the detail form which is important for electrical field analysis has not been described. The arrangement mode of lines affect electrical field significantly. Hence, simulation of triangular and horizon arrangement are proceeded in this paper. The terms include rotation track, rotation direction and initial phase angle.
Research of Single Phase APFC
Authors: Zhou Jia , Tan Xiao Long , Wang Wen Bin
Published: May 2014

DC voltage, input voltage and current need testing for control circuit of general PFC circuit that makes circuit complex and high cost. And using of sensors decreases the reliability of circuit. Hence, simulation analysis of single phase APFC without DC voltage sensor is present in this paper.
A 520MHz Wideband Variable Gain Amplifier
Authors: Zhang Jing Zhi
Published: May 2014

The design and realization of a wideband variable gain amplifier for RF system is presented. The cascade of LNA and controllable attenuation makes the design have a 0-90dB gain adjustment range. Special care is devoted to the solution of typical problems encountered in the design of the amplifier, such as signal shielding and power supply decoupling. The amplifier uses passive amplitude-frequency equalization, 0.1-460MHz band variation is less than 1dB, the 3dB bandwidth is up to 520MHz. The noise characteristic is low, the total input referred noise is less than 15.5nV⁄√¯Hz.
The Development Research of Solar Energy Power Supply Devices
Authors: Guo Hui Dong , Xue Ying Nan , Liu Yi Min , Mi Xiao Dong , Yan Jian Zhang , Du Xin Hui
Published: May 2014

According to the current energy trends, the paper designs a power supply device to keep the Power Supply Platform that the solar power as the main energy, meanwhile the Storage Battery and alternating current as the minor energy working normally. The device has the function of switching the power supply to achieve the uninterrupted power supply to loading in any environment so that will output DC stably and carry three charging to the Storage battery. Through the Ps-pice software simulation results show that the modules can meet the design requirements. It can achieve the results of switching power and select function of the Storage battery power charging module through controlling circuit by Proteus simulation software. The power supply device has the advantages of high reliability.
Design and Implementation of Intelligent Multi-Serial Ports Data Transmission System Based on NIOS II Using in Smart Home
Authors: Zhang Shan Shan , Chen Chao
Published: May 2014

In the need of intelligent multi-serial ports communication in smart home project, which ask for less consumption of resources. This paper introduces a NIOS II-based 6-way serial data communication, and it defines the corresponding data communication protocol.It makes PC could easily exchange data with FPGA and peripheral circuits. Experimental results show that the scheme has high reliability and stability. Serial number can be flexibly changed according to the actual needs, It could also be configured individually for each serial port, so it has good portability, flexibility and easy of implementation. At the same time reducing the hardware debugging time and saving hardware resources.
A Nested Folded 4f System for Ultra-Short Optical Pulse Shaping by Liquid Crystal Spatial Light Modulator
Authors: Duan Fang Zhen , Yang Xue Hua , Nie Yong Ming , Qi Jun Li
Published: May 2014

In order to modulate the spectral phase properties of the ultra-short optical pulse in two dimensions by the liquid crystal spatial light modulator (LC-SLM), a setup named quasi-zero-dispersion nested folded 4f system is proposed, in which a grating disperses the ultra-short optical pulse frequency components in the vertical direction and a prism disperses the ultra-short optical pulse frequency components in the horizontal direction. Because the frequencies are dispersed in two directions, the LC-SLM is utilized more effectively and the optical frequency resolution for arbitrary temporal waveform generation is higher than the conventional zero dispersion 4f system. In theory, the quasi-zero-dispersion nested folded 4f system can generate arbitrary desired temporal waveform ultra-short optical pulse. Based on the system, Femtosecond pulse beam with Gaussian temporal waveform is used for experimentation, and an optical pulse train and several other temporal profiles were obtained. All the experimental results indicated that the quasi-zero-dispersion nested folded 4f system is reliable for arbitrary ultra-short optical pulse waveform generation, which fit well with the theoretical analysis. In the future, if a proper high dispersive optical element substitutes the prism in the quasi-zero-dispersion nested folded 4f system, the setup we proposed here will be widely used in the optical pulse shaping areas.
Design and Research on a 24GHz Microstrip Array Antenna
Authors: Li Yu Jun , Li Bo Quan , Zhang Qian
Published: May 2014

A 24 GHz microstrip array antenna based on series and parallel combination feeding network is designed in this paper by theoretical and experimental study. The whole design process includes theoretical analysis, HFSS ( High Frequency Structure Simulator ) simulation and practical manufacture. The array antenna design mainly includes four parts, design of the microstrip patch element, determining the number of radiating patch elements, determining the distance between every two adjacent patch elements and design of feeding network. Then, the microstrip array antenna is simulated and optimized by HFSS. The simulation results show that the VSWR ( Voltage Standing Wave Ratio ) characteristics present good, the maximum gain reaches 21dB and E-plane together with H-plane half-power beamwidth is as small as about 11.8 o . Both of the first side lobe levels are about-14 dB reaching the design requirements. After practical manufacture, the testing results show that the various indicators coincide with the simulation results and the antenna is reliable with stable performance.
Study on Main Circuit Mathematical Model and Control Method of Advanced Static Var Generator
Authors: Zha Cong Mei , Xu Jia Yun
Published: May 2014

In this paper ,a main circuit mathematical model of Advanced Static Var Generator (ASVG) is established. a direct current control method for SVG is put forward based on d-q transformation, this method is also analyzed from theory and made simulation model, the simulation results show that this control method is reasonable and effective.
Effect of Different Thicknesses of ZnS Thin Films on its Optical and Structural Properties
Authors: Duo Shu Wang , Ke Huan , Liu Ting Zhi , Zhang Hao
Published: May 2014

ZnS films have been deposited on glass by chemical bath deposition (CBD). The optical and structural properties were analyzed by UV-VIS spectrophotometer and X-ray diffraction (XRD). The results showed that different sides of glass substrate have different thicknesses of the ZnS thin films, which can affect the optical and structural properties of ZnS thin films. The ZnS films of the side of glass substrates back to the solution center are thicker than that of the other side, and the ZnS films from ZnSO4 are thicker than that from Zn (NO3)2. The transmittances lower with the thicknesses of ZnS films increasing. The band gaps exhibit blue response with the thicknesses of ZnS films increasing. From the sides of glass substrates back to the solution center, the (111) reflection of the sphalerite structure can be observed at about 2θ=29.1°, while from the other side toward the solution center showed no significant peak.
Simulation and Optimization of Muffler Based on GT-Power
Authors: Yu Miao , Yuan Shou Li
Published: May 2014

This paper with the provided conclusion of one muffler scheme and the experiment, use GT-Power software build muffler and the coupling model of engine to simulate its scheme and the characteristics of acoustic. Optimization scheme is put forward to increase the efficiency of the muffler and economical purpose.
The Transient Effectiveness Research of Ultra-High Voltage Short Tripping Fault to Large Region Grid Based on Hybrid Simulation
Authors: Zheng Wei Jie , Li Bai Qing , Chen Ge Song
Published: May 2014

The paper build the large region grid model of ultra-high voltage in electro-magnetic and electro-mechanical hybrid simulation system, and researched the effectiveness of ultra-high voltage transmission line to large region grid, especially the N-1 short tripping fault caused transient stability problems.
Study on the Specific Harmonic Suppression of Active Power Filter
Authors: Rui Xiong , Xi Zi Qiang , Zhou Miao
Published: May 2014

Aiming at the problems that the traditional active power filter (APF) which is with limited bandwidth and is difficult to realize zero steady-state error control, we use a strategy based on multiple synchronous rotating coordinate for each harmonic separation to achieve the detection of selective harmonic and proportion-integral (PI) control. Then it’s able to implement zero steady-state error compensation. After establishing the mathematical model of harmonic rotating coordinate for the APF, we proposed a simple strategy of current coupling and decoupling. The simulation results and the prototypes’ practical operations proved that the control strategy can compensate for the selective harmonic effectively and respond to the changes of the conditions in time. Meanwhile it has good characteristics in dynamic response.
Speeding up Based on the Process Optimization of High Voltage Business Expanding
Authors: Li Juan , Jiang Hai Ying
Published: May 2014

As the primary link and the accepting link of power supply and sale, the quality of business expansion is directly related to the economic benefits and social profile of the power company. By many measures, such as reducing the link of process and delayering business expansion process, realizing multi link synchronous operation and integrally operating all qualified links, the process of high voltage business expansion project is optimized. The practice proves that these measures effectively reduce the average time of power access, and improve the level of power supply service.
Keywords: power supply company; business expanding; process optimization; average power access time
Simulation and Optimization Design of the Heat Waveguide Optical Switch on Non-Fourier Heat Conduction Theory
Authors: Song Ji Yun , Zhang Xiao Min , Chu Zhong Xiang , Zhang Long
Published: May 2014

The temperature distribution of the heat waveguide optical switch with different cladding materials is simulated on Fourier heat conduction theory and non-Fourier heat conduction theory, discussing effect of the cladding materials on the power consumption and the response speed of the device. The main conclusions as follows: (1)The response speed of waveguide optical switch with silica as cladding is faster than that with PMMA as cladding. (2)Thermal relaxation time has significant influence on the temperature of the core layer: the variation of optical switch core layer temperature gets bigger with the increase of material thermal relaxation time.
Simulation and Research for Gas Boiler Based on the Vague Set PID
Authors: Zhao Gang , Li Jian
Published: May 2014

Gas hot water boiler is widely used as heating equipment in everyday life. Because gas hot water boiler has the characteristics of nonlinear, large inertia and disturbances, so it is particularly important to build a precise mathematical model. Then the difference equation model of the system is identified by the least square method according to the collected data in this paper. Writing M file in the MATLAB software to get the continuous transfer function, and setting up Vague Set PID simulation, fuzzy self-tuning PID simulation and conventional PID algorithm in SIMULINK. By comparing among the three kinds of adjusting method, We get that Vague Set PID not only in regulation time, overshoot and effect of dynamic performance is superior compared the other two controller models , but also enhance the robustness and adaptability of the system, has a good dynamic, static performance..