bluuebunny/crossref_metadata_2025 huggingface dataset:
The Difference of Physiological Indicators of Ground and Underground Subway Workers: A Preliminary Field Study
Authors: Ma Qing Guo , Zhou Xiao Lin , Zhao Lun , Bian Jun , Dai Wei Hui
Published: October 2014

Underground mining has traditionally been one of the most hazardous industries, and various accidents happen with high frequency in recent years, highlighting the need for explicit attention to safety management in the course of industrialization in China. Researchers and practitioners tend to overlook the physical and mental load of the front-line workers, which gives rise to the potential hazard in production. By investigating the workers physiological and psychological states, the research could enlighten management practice including formulating new production plan and reducing industrial hazards caused by fatigue, lagged responsiveness and misreading. The current study adopted physiological measurement techniques to study the differences of subway construction workers’ physiological and psychological states between two conditions—on the ground and underground, and contributed to the research on safety management of underground construction projects from human-oriented perspective.
Real Estate Abroad: How to Make the Right Choice
Authors: Vatin Nikolay , Gamayunova Olga
Published: October 2014

Last years more and more Russians are buying property abroad, not only in order to obtain from her rental income or resale, but also for a family holiday by the sea in a favorite of the country. The article describes the main criteria for the choosing of foreign real estate. Particular attention is paid to the specifics of buying property in countries such as Turkey, Egypt, Greece.
Comparison of Chinese and American Product Injury Features
Authors: Feng Yong Qin , Yin Yan , Zhang Xiao Rui , Xie Zhi Li
Published: October 2014

Based on the product injury data provided by the National Electronic Injury Surveillance System (NEISS) in the US and the National Injury Surveillance System (NISS) in China, different features of Chinese and American product injuries have been analyzed. American product injuries are mainly focused on children, teenagers and senior citizens, while Chinese product injuries are mainly focused on working-age population. In the US, the percentage of men injured by products is close to that of women. But in China, the percentage of men injured by products is almost twice that of women, showing a distinct gender difference. In the US, the percentage of people injured by product treated and recovered is higher than in China, while the percentage of the hospitalized and dead is lower than in China.
Shaping the Image of the Enterprise in the E-Commerce Network's Times
Authors: He Hui
Published: October 2014

Network as a new carrier of information dissemination, has gradually become the important channel of network enterprise image. This paper discusses the times of electronic commerce. Enterprise network's image meaning, analyzes the transmission characteristics of the network, the author put forward the strategy of the enterprise website image creation.
The Research of Peer-Reviewed Mode and Evaluation Standards Based on Online Published Papers
Authors: Fu Zhao Xia
Published: October 2014

Peer review is a new phenomenon in the process of internationalization of academic journals, but also a worldwide problem. In this paper, the development and practical application of peer review system are sort out, which are based on objective data research of domestic and international academic journals; the problems of network online published papers in practice are analyzed and explored by modern advanced network technology as the application tool, and how scientific orientation are they to play an effective role. The purpose of paper is in order to ensure the impartiality of the academic council, spread rapidly and use information resources, and further promote to enhance the overall level of academic journals.
Design of Digital Teaching Platform of the Internet of Things
Authors: Huang Bin Wen , Li Jie Yu
Published: October 2014

Design of digital teaching platform of the Internet of Things (IOT) is to solve the technical problem about how to provide all-digital, high-simulation and feature-rich digital teaching platform of IOT. This design includes the operating terminal, the master node of IOT, slave node of IOT, RFID Read/Write modules and RFID labels. Compared with the existing technology, this design can simulate the operation and usage of IOT in various application environments, it is very convenient for students to study and master the basic technology of IOT, it can be widely used in all kinds of school teaching and scientific research.
The Synthesis and Characterization of Oxide Free Tin Nanoparticles
Authors: Pan Zhi Long , Ao Shi Liang , Jia Jian Ping
Published: October 2014

Oxide free Tin nanoparticles were synthesized from a chemical reduction method. Their morphological and thermal characterizations were studied in this paper. The X-ray diffraction (XRD) study showed that no oxides of Tin nanoparticles were formed. The thermal characterization by differential scanning calorimetry (DSC) exhibited the size dependency of the melting points. The melting point was as low as 202.16°C.
Research of Aluminosilicate Refractorial Erosion Process on the HCL in Blast Furnace Gas
Authors: Hu Bin Sheng , Hu Xue Wu , Gui Yong Liang , Han Xiao Guang
Published: October 2014

According to the study on blast furnace refractory erosion caused by HCl gas, it was found that HCl gas can promote for the silicate glass phase and the recessive aluminum silicate to transform into mullite and christobalite in the alumina brick, so that it can increase the porosity in the alumina brick. Hcl gas reacts with non-carbon elements to form the chloride which causes the brick to be loose and porous in the carbon brick. Thus the brick loss is accelerated.
Experimental Study on Comparison about the Modifiers of Rubber Cement Concrete
Authors: Li Wei , Huang Zhen , Wang Xiao Chu , Wang Jun Wei
Published: October 2014

5-8 mesh rubber granules was mixed with an equal volume instead of fine aggregate, and the content of rubber was 5%, 10%, 15% and 20%. Compared with the influence of silane coupling agent, latex and silica fume to the mechanical properties of rubber concrete, it studied the mechanism of rubber-modified to the rubber concrete. The test results proved that the silane coupling agent, latex, and silica fume could improve the compressive strength, splitting and flexural strength. Latex could significantly improve the bond strength of cement-based materials and the integrity of the concrete. Coupling agent made rubber bond with cement-based materials to form a stable connection, and silica fume filled the pore in concrete, so it optimized the gradation. Latex was the best, silane coupling agents was second, and silica fume was the last about the improved effect of three kinds of modifiers.
Influence of Several Calcareous Compounds on the Performance of Sulphoaluminate Cement Paste
Authors: Tong Yu , Zhang Jun Nan , Wang Lin , Li Ming , Zhao Wei Jian
Published: October 2014

In order to clarify the adaptability of sulphoaluminate cement (SAC) and to improve the quality of SAC construction, several common calcareous compounds including calcium chloride, calcium sulphate and calcium hydroxide in designed content were introduced to SAC paste, respectively, following by the investigations of the corresponding fluidity degree and setting time. The experimental results show that calcium chloride in relative high content (no less than 1%) accelerates the cement setting, along with an enlarged degree of fluidity. As a comparison, the involvement of calcium sulphate in SAC paste does simply play a role of setting retarder by prolonging the setting time and enlarging the fluidity degree simultaneously. On the other hand, the presence of calcium hydroxide in SAC paste results in a state of being “neither setting nor flowable”, since the corresponding SAC paste shows a prolonged setting time and a remarkably lowered degree of the initial fluidity degree. All the phenomena can be explained from the viewpoints of hydration mechanism of dehydrated calcium sulphoaluminate.
The Structure Design of Continuously Reinforced Concrete Pavement in Shi Ji Road
Authors: Zhou Ming Hui , Yang Jian Ming , Zheng Ming
Published: October 2014

At junction of Heng dong Count Shi Ji Road and Zang Qing Road, its subgrade soil is almost miscellaneous fill. Based on the analysis of the basic characteristics of miscellaneous fill subgrade and the local climate and traffic load, we apply the Dynamic compaction method consolidate to the Miscellaneous fill foundation and replace the conventional road with continuous reinforced concrete pavement (CRCP). This paper provides the Continuous reinforced pavement design method and a reference for similar projects.
Deformation Characteristics of Concrete under Uniaxial Compression
Authors: Liu Guo Jun
Published: October 2014

Depth study of deformation characteristics of concrete can reveal failure mechanism of concrete materials based on strain. This paper studies the deformation characteristics of concrete under uniaxial compression, and draw conclusions that deformation can cause the expansion of internal micro cracks, in accordance with the expansion of micro cracks, the law of cracks development of concrete under uniaxial loads is divided into three stages, micro-cracks relatively stable, stable crack development period and unstable crack development period. The research results can provide valuable reference for future research work.
Research Status of Concrete Strength Theory Based on Stress and Strain
Authors: Liu Guo Jun
Published: October 2014

In the civil engineering structures, when concrete structure withstand external loads, internal defects such as micro-cracks gradually developed, eventually will lead to the destruction of the concrete. Currently, there are two types of strength failure criterion of concrete, strength failure criterion based on stress-space and strength failure criterion based on strain-space, both of which have advantages and disadvantages, this paper introduces the research status of the two strength failure criteria of concrete, and the problems need further study in the future. It plays a strong practical significance in scientific research.
Influence Analysis of Cold Formed Steel Members on Thermal Characteristics of Building Envelopes
Authors: Kashevarova Galina , Kosykh Pavel
Published: October 2014

The article in question presents the comparison of thermo-protective characteristics of building envelopes constructed on the basis of cold formed steel members according to the results of computer modeling, engineering methods and full-scale experiment. Two comparative parameters were chosen: the coefficient of uniformity and the difference in temperatures of the construction internal surface. The influence of various “input” parameters (thickness, insulation thermo conduction and etc.) on thermo-protective characteristics has been analyzed. The asymptotical character of connection between thermo resistance of non-uniform building envelope and insulation thermo conduction has been deduced.
Effect of Temperature on the Mechanical Property of the Film-Substrate Interface of Diamond Coatings
Authors: Jian Xiao Gang , Zhang Yun Hua
Published: October 2014

Model of the film-substrate interface of diamond coatings is built with the method of molecular dynamic, and the molecular dynamic simulation is applied to study the mechanical property of the model based on the Morse potential function and Tersoff potential function with temperature ranging from 0K to 800K. The results show that the adhesive strength of the interface between the diamond coatings and the cemented carbide substrate behaves a downward trend when the temperature rises from 0K to 800K and the downward trend is sharp when the temperature increases from 0K to 300K and the downward trend is smooth when the temperature rises from 300K to 800K. Meanwhile, the varying trend of the energy with the temperature is similar to the adhesive strength.
Fabrication of Microstructure on Nickel Template by Femtosecond Laser
Authors: Zhang Lei , Cao Xiao Wen , Li Shun Guang , Xiang Ru Yi , Sun Hui Chao
Published: October 2014

This paper presents an experimental investigation into microfabrication of nickel template by femtosecond laser in air at atmospheric pressure. The laser pulses used for the study are 800 nm in wavelength, 100fs in pulse duration, and the repetition rate used is 1KHz. Micro-hole ablation experiments are carried out in air by focusing the femtosecond laser beam on the nickel target surface at normal incidence with the long-focus objective lens of enlargement factor 50 and NA=0.7. Dependence of the diameter, depth and depth-to-diameter ratio of the fabricated holes on the laser power and number of pulses are revealed experimentally. Microgrooves with good uniformity are fabricated on nickel template with femtosecond laser by optimizing the process parameters.
Simulation of Grinding Surface Roughness by End Face Grinding Wheel with Phyllotactic Abrasive Pattern
Authors: Li Xing Shan , Shao Mei Li , Wang Jun , Lu Yu Shan
Published: October 2014

In order to improve the performance of end face grinding wheel, the phyllotaxis theory is introduced into the design of the wheel. Meanwhile the movement track equation of the end grinding is established, and the effects of the phyllotactic coefficient on the grinding surface roughness are studied. The simulation results show that the lower surface roughness values can be obtained when choosing reasonable phyllotactic coefficient. It will provide theoretical basis for the ordered abrasive patterns of the end grinding wheel.
Uniaxial and Biaxial Tensile Properties and Resilience of a Weft Knitted Modal Fabric
Authors: Ma Zheng Yu , Jiang Jin Hua , Zhuo Dong Fang , Chen Nan Liang
Published: October 2014

This paper is mainly to study the tensile and resilience performance in a knitted plain Modal fabric by uniaxial and biaxial experimental. The results indicated that under uniaxial tensile, the breaking strength along warp direction of the knitted plain Modal fabric was higher about 75% than the strength in weft, while weft elongation was higher about 60% than in warp. The strength-strain curves under uniaxial tensile and biaxial tensile of the fabric were made up of approximately three stages: a linear stage and two nonlinear stages. A set of parameters and a serial mathematical fitting model functions of the strength-strain curves were obtained by experimentally. It could be predicted stress and strain of knitted fabrics under some given certain elongation or load to meet certain clothing pressure comfort for underwear fabrics or garment.
Aerodynamic Characteristics of an Airfoil with Boundary Layer Ingestion in Subsonic Flow
Authors: Wu Jiang Hao , Li Xue Mei
Published: October 2014

The influence of boundary layer ingestion (BLI) on the aerodynamics of airfoil RAE2822 in subsonic is investigated by numerical method. Based on the calculation, it is found that the mass flow ratio (MFR), intake height, cowl length and intake position in the chord can affect on the lift, drag and pitching moment remarkable. Considering a maximum lift-over-drag, intake position in the chord should be rearward as possible with a certain high MFR at a small angle of attack and a considerable intake height. There is a proper MFR which makes drag lowest.
Conformal Invariance and Conserved Quantity of Mei Symmetry for Appell Equations in a Holonomic System with Mass Variable
Authors: Zhang Yao Yu , Sun Xian Ting , Xue Xi Chang , Jia Li Qun
Published: October 2014

For a holonomic system with variable mass, the conformal invariance and the conserved quantity of Mei symmetry of Appell equations are investigated. First, by the infinitesimal one-parameter transformation group and the infinitesimal generator vector, the Mei symmetry and the conformal invariance of differential equations of motion for Appell equations in a holonomic system with variable mass are defined, and the determining equation of Mei symmetry and conformal invariance for Appell equations in a holonomic system with variable mass are given. Then, the Mei-conserved quantity corresponding to the system is derived by means of the structure equation to which the gauge function satisfies. Finally, an example is given to illustrate the application of the result.
Control Problems for the MHD Equations under Inhomogeneous Mixed Boundary Conditions
Authors: Brizitskii Roman , Tereshko Dmitry
Published: October 2014

The new control problems for the stationary magnetohydrodynamics equations under inhomogeneous boundary conditions for the magnetic field are considered. In these problems we use velocity and magnetic field boundary controls to minimize functionals depended on velocity and pressure. We study uniqueness and stability of solutions to these control problems and discuss some computational results.
Equilateral Triangle Grid Cylindrical Shell Parametric Design
Authors: Lu Xiao Yang , Wang Qiao Sha , Zhao Xiao Wei , Lu Shao Bo , Liu Feng Cheng , Xin Jing , An Ran , Liu Xiu Zhi , Su Ya , Li Long
Published: October 2014

By using ANSYS software parameter of design language APDL the parametric design macro program of two types of equilateral triangle cylindrical lattice shell are given with the given parameters of the span S, the length L, the rise F, the number of lattice in the span direction the model of equilateral triangle cylindrical lattice shell would be obtain easily. Thus offer convenience for force analysis and optimization design about this structure. The force analysis of the two type equilateral triangle cylindrical lattice shell is done. By contrast with the five typical cylindrical shells, the two type equilateral triangle cylindrical lattice shell has good rigidity and strength, and has application value in practice engineering.
High Arch Dam Reservoir Basin Deformation & Effect on Dam Operating Status
Authors: Zhao Er Feng , Jiang Yu Feng , Gu Yan Ling
Published: October 2014

With the development of 300m super-high dams are built in the southwest of China, reservoir water gravity will make the settlement of the reservoir basin, which will make dam tilt upstream. In the paper, reservoir settlement will be studied in-depth on the basis of monitoring data analysis and numerical simulation comprehensively. First, reservoir basin will be sinking with the rising of the upstream water gradually according to level monitoring data. Second, those affect factors of FEM calculation have been explored comparatively, such as displacement modes, element geometry and boundary conditions. Third, reservoir, dam and foundation are integrated into a whole to establish a wide spread finite element model. At last, reservoir deformation and its influence factors are determined through the simulation of the bedrock depth, the extending length of the upstream and downstream and different water levels. Those methods have been applied into an engineering project and analysis results show that the settlement of the reservoir will make high arch dam tilt upstream, the higher of the water level, the larger of the horizontal displacement. Accordingly, reservoir deformation should be considered deeply on the appraisement of super-high arch dam operating status in future.
Influence of Cylindrical Inclusion on the Elastic Field of Soft Material Loaded by Wedge Indenter
Authors: Tan Xiao Hua , Qiu Wei , Xiao Xia
Published: October 2014

In this work, the influence of a rigid cylindrical inclusion on the elastic field in a transparent soft material is studied by an embedded-grating technique. The same experimental procedure was implemented on two specimens, a homogeneous bulk soft material and the same material containing a rigid cylindrical inhomogeneity. Under the indentation of a rigid wedge, two kinds of deformation sectors underneath the contacting boundary are observed from experimental results. Furthermore, the shape of the deformation sectors is horizontally expanded due to the inclusion. A local fluctuation of contact stresses between the soft matrix and rigid inclusion are discussed.
Numerical Investigation of the Minimum Roof Thickness of Mining Stope in Bailing Copper-Zinc Mine
Authors: Ma Jiang Feng , Zhang Xiu Li , Jiao Yu Yong , Tian Hu Nan
Published: October 2014

A three-dimensional numerical model of the rock mass including ore body is established by FLAC3D software, and then the surface subsidence caused by backfilling under different roof thicknesses of mining stope (the vertical distance between upper mining limit and surface) are calculated and analyzed. By comparing the surface displacement, the stress distribution, and the damage zone under different conditions, the minimum roof thickness is determined.
Numerical Simulation of Groundwater Flow in Strata with Argillation Weak Permeable Media in Long Deep Buried Tunnel Site
Authors: Deng Ying Er , Peng Xin , Jiang Huan Huan
Published: October 2014

This paper focused on groundwater flow in certain a tunnel site under conditions of high ground stress and high water pressure (referred to as “two high conditions”). Three-dimensional conceptual model was established for groundwater flow in porous strata with argillation weak permeable media in a long deep buried tunnel site. Groundwater flow field was studied by means of three-dimensional numerical simulation. Results show that there is good agreement between numerical simulated and observed groundwater table and that the conceptual model and the numerical simulation are reliable. Prevention measures should be adopted for a long deep buried tunnel construction. The results can provide evaluation of engineering safety of a long deep buried tunnel construction with scientific basis.
Superficial Discussion on New Framework of Static Equilibrium
Authors: Zhang Xiang Ming , Zhu Li Bao , Wang An Wen , Yang Shao Hong , Hu Ming Yong
Published: October 2014

Statics is set up on the basis of 4 axioms of statics. Although these axioms are distillate and summarizing of the accumulated humankind's experience in long-range production and life, introduction of these axioms to statics seems a bit abrupt, especially the critical axiom "resultant of two forces" far fetched. This article was an attempt to present the embodying description of the effect of force and force system, based on the nature of effect of force and the equivalent and equilibrium of force systems. On this basis, theorem of two forces resultant and the theorem of two forces balance were proved, and the theorem of force systems equivalent was brought up. A new framework of static equilibrium system was built up to try to make a more perfect and more reasonable description for static equilibrium.
The Influence of the Flight Aerodynamic for Interactions of Wings and Body of the Honeybee
Authors: Zhao Hong Yan , Zhang Peng Fei , Ma Yun
Published: October 2014

The flight mechanism of flapping-wing was studied by using the translation-rotation model. We established the flapping-coordinate of the wing, gave the equation of the motion, and simplified the flapping-wing model. The aerodynamic and vortices were simulated by the CFD software of Fluent. The leading-edge vortex generated in the translation phase, and delayed stall mechanism had an important effect on the high lift. In the rotation phase, lift peaks appear due to the wing rapidly rotating and rotational circulation mechanism. The aerodynamics were obtained in different amplitudes, frequencies, angles of attack, the locations of rotating axis and timings of rotation. The influence of these parameters on average lift coefficient is obvious, while it can be ignored to average drag coefficient. Keywords: wing, aerodynamics, vortices, numerical simulation.
Establishment and Simulation of Nonlinear Dynamic Model of Finished Automobile
Authors: Li Li Yun
Published: October 2014

This paper established the nonlinear dynamic model of finished automobile to study the influence of suspension structural parameters, automotive braking and steering on the vehicle driving comfort and handling stability. The simulation results show that in the vehicle steering process, the body roll changed indirectly the tire lateral force, which had the impacts of yaw and lateral movement, and the interaction between the suspension and steering between systems is very significant especially under condition of the uneven road excitation. When the peak of the tire steering angle increased, the roll angle of vehicle body became larger and larger, followed by the change of body posture and the deterioration of ride comfort. With the increase of the steering angle, the lateral acceleration of the vehicle became larger and larger, and even resulted in tire skidding, thus reducing the driving safety of the vehicle.
Modified Wavelet-Based Multilevel Discrete-Continual Finite Element Method for Local Structural Analysis - Part 2: Reduced Formulations of the Problems in Haar Basis
Authors: Akimov Pavel A. , Mozgaleva Marina L. , Aslami Mojtaba , Negrozov Oleg A.
Published: October 2014

The distinctive paper is devoted to wavelet-based discrete-continual finite element method (WDCFEM) of structural analysis. Discrete-continual formulations of multipoint boundary problems of two-dimensional and three-dimensional structural analysis are transformed to corresponding localized formulations by using the discrete Haar wavelet basis and finally, with the use of averaging and reduction algorithms, the localized and reduced governing equations are obtained. Special algorithms of localization with respect to each degree of freedom are presented.
Study on Vortex Evolution Processes of Transient Driven Flow in a Square Cavity
Authors: He Shi Hua , Zhang Li Xiang , Hu Ji Min , Shen Chun Ying
Published: October 2014

The transient vortex structure evolution process of two-dimensional flow in a driven square cavity with one moving end was studied. The time curves of flow field variables, the flow patterns of different specific moments and the required times of flow field from static to statistical steady state were comparatively analyzed for different Reynolds numbers. Transient simulating results show that the nascent vortices always appear near the boundaries in the initial driving stage, then gradually move away from the boundaries to form a large vortex almost occupying entire cavity and two secondary vortices in left and right corners of the cavity bottom. The greater the Reynolds numbers, the longer the required times of the flow field reaching by the statistical steady state, also, the more complex of the vortex structure evolution.
The Buckling Analysis of Drill String in Inclined Wellbore with a Concave Curved Geometric Defect
Authors: Zhu Bing Kun
Published: October 2014

Some inclined boreholes have to be drilled in directional wells, but the track of inclined borehole is impossible to be a ideal straight line, there are always some geometric defects such as bending, thus the drilling string in it is bound to have initial bending due to the constraints of borehole, hence the drilling string in inclined borehole is usually a curved compressed rod. Its buckling nature is quite different from straight compressed rod, it is necessary to analyze it specially. In this paper the buckling problem of drill string in inclined borehole with a concave curved geometric defect is studied by energy method, the computing formula of buckling load for it was obtained. And the influence of initial concave bending on buckling load was discussed. The research indicates that when drilling string in inclined well bore has a initial concave bending, the greater the degree of initial bending of drill string, the greater its buckling load.
Calculation of Long Span Structures to Seismic and Accidental Impacts in Nonlinear Dynamic Formulation
Authors: Andreev Vladimir I. , Mkrtychev O.V. , Dzhinchvelashvili Guram A.
Published: October 2014

This article suggests methods of calculations of buildings and structures responsible for specific effects on the basis of nonlinear dynamic methods. Example of calculations wide-span structures in the time domain by direct integration of equations of motion, taking into account the nonlinear nature of the structures.
Dynamical Study of a Structure: The Case of Al Hoceima’s Earthquake / Morocco
Authors: el Ghoulbzouri Abdelouafi , el Alami Zakaria , el Hannoudi Sabrine , el Youbi Mohamed Salaheddine
Published: October 2014

This work consist to make a dynamic study of an actual structure sized before applying Moroccan seismic regulations RPS2000, the study will be made using the SAP2000 software and exploiting accelerograms of Al Hoceima’s earthquake occurred on 24th February 2004, this earthquake was recorded at several Spanish stations this analysis will first identify some dynamic characteristics of the studied frame like eigenmodes of the frame and the maximum displacement of the terrace. The use of several accelerograms will highlight the influence of distance on the intensity of the earthquake and will give some information about sol-structure interaction
Determination of Settling Velocity of Suspended Sediment in Estuary
Authors: Huang Hui Ming , Chen Da Ke , Zhang Wei Na , Chen Cheng
Published: October 2014

The settling velocity of sediment is a hot issue and a basic problem in study of sediment transport and estuarine engineering. According to field hydrodynamics and sediment data around the South Passage of the Changjiang River in China, this paper detected the characteristics of sediment particle size and vertical distribution pattern of suspended sediment concentration, and further estimated the settling velocity of suspended sediment in three methods. The results show that the sediments including suspended and bed load can be categorized into cohesive sediments and the sediment concentration profile agree well with logarithmic distribution. Furthermore, by comparison, it is found that the Rouse formula is more reasonable for estimating the settling velocity of fine sediment, but the Zhang Ruijin and Stokes formula obviously underestimate the values of settling velocity, caused by do not taking into account the flocculation of fine sediment in estuary.
Analysis of Sealing Properties of Coupled Gas Film Flow Field and Cantilever-Type Foil Deformation
Authors: Ma Gang , Du Yun Long
Published: October 2014

Aimed at cantilever-type foil cylinder film seal system, finite element method analysis model was established to calculate the deformation of cantilever foil under the gas pressure based on the theory of plate bending. The paper proposed a method to solve fluid-solid interaction problems in cantilever-type foil cylinder film seal system based on the numerical analysis method of cylinder gas film seal. The calculation program using the finite element method to solve fluid-solid interaction problems was developed. Calculation simulation of the film mechanical properties and steady-state performance of sealing system was realized which improved the accuracy of the sealing system performance analysis and provided the basis for the multi-parameters matching design of sealing system. The impact of adding cantilever foil support structure to the steady-state performance of sealing system and the influence of flexible support parameters on the steady-state performance of the sealing system was calculated through the method.
Critical Cooling Rate of Y36Nd20Al24Co20 Bulk Amorphous Alloy
Authors: He Shi Wen
Published: October 2014

A new bulk amorphous alloy, Y36Nd20Al24Co20, with a diameter of 5 mm was successfully fabricated by the method of equiatomic substitution for the Y element in Y56Al24Co20amorphous alloy. The values of the supercooled liquid region ∆Tx(=Tx-Tg), the reduced glass transition temperature Trg(=Tg/Tl) and the parameter γ (=Tx/(Tg+Tl)) for Y36Nd20Al24Co20bulk amorphous alloy are 60K, 0.605 and 0.415, respectively. The critical cooling rate of the Y36Nd20Al24Co20bulk amorphous alloy was determined to be 40 K/s, providing an indication that this alloy has a high glass-forming ability.
Comparison of Static and Dynamic Analysis on KJYF96/8 Mobile Refuge Chamber
Authors: Zhang An Ning , Gu Yu Ming
Published: October 2014

This paper studied the difference between the static analysis and dynamic analysis on the mobile refuge chamber. The structure strength static analysis of KJYF96/8 mobile refuge chamber was made by the finite element software SolidWorks Simulation and the stress cloud chart and the displacement cloud chart were obtained. The corresponding relation between the dynamic analysis result and the static analysis result was obtained based on the comparison with the result of the dynamic analysis. The results indicate that the values of the max stress and displacement by static analysis with a uniform external pressure of the dynamic pressure peak value are greater than those by dynamic analysis. And the weighting method of static analysis can be used in the coal mine mobile refuge chamber structure design process instead of dynamic analysis.
Development and Design of Cold Radiation Refrigeration Energy Saving Technology of Comfort Air Conditioning
Authors: Li Mao Ren
Published: October 2014

This project is mainly used in the comfort air conditioning system, replacing the conventional indoor air conditioning using fan convection cooling form, directly to the traditional air conditioning evaporator by convection heat transfer to type into the radiation heat transfer form, using modern new polymer composite material as the main body of the evaporator, the refrigerant cycle, in the mature theory of refrigeration the design of conventional air conditioning operating conditions of vapor compression on the overall setting of air conditioning design, exploration and design with the radiation air conditioning system technical requirements, the radiant cooling refrigerant system the data acquisition, development and design of intelligent controller and related problem of air conditioner indoor dew point control, thus the formation of completely based on the prototype structure of energy-saving radiation cooling technology of comfort air conditioning.
CFD Study on the Factors Influencing the Performance of PV-Integrated Double-Skin Façade Channel
Authors: Chen Lei , Shou Qing Yun , Pei Xiao Mei
Published: October 2014

Several factors influencing the performance of PV-integrated double-skin façade were analyzed. We used CFD numerical method to investigate the influence of width, height, outlet size and the angle of photovoltaic plate on the performance of PV channel based on the summer typical meteorological parameter. The PV-integrated double-skin façade were installed at east orientation in Shanghai. The recommended value of height and other factors were obtained. Height and the angle of photovoltaic plate were two most important factors which should be considered specially in the design of PV-integrated double-skin façade.
The Research and Application of Vertical Wells Multilayer Fracturing Technology
Authors: Zhang Li Wei , Fan Li Hua , Chang Yu Lian
Published: October 2014

The difficulties in oil mining is increasing and the quality of the remaining oil reduced gradually after Daqing oil field came into the late high water contamination stage. There are several factors that prevent the convention from single layer fracturing technology to multilayer fracturing technology. Firstly, about 20% of fracturing rate could be achieved by elevating the K Series packer 3 times in the 5 fracturing techniques, but the performance of the plastic tube cannot be guaranteed. Secondly, the fracturing success rate is not guaranteed if Y series are elevated 4 times to complete the 5 layer fracturing, besides consistent intervals between the five layers must be maintained, which is very difficult. To further enhance the vertical well fracturing multilayer capability, we carry out multi-layered vertical well fracturing technology research, and have achieved good results in the field application.
Maximum Integration Capacity Analysis of Distributed Generator in Distribution Power System
Authors: Zhou Feng , Piao Zai Lin , Liu Ke Yan , Sheng Wan Xing , Meng Jia
Published: October 2014

The integration of distributed generator (DG) will bring a series of influence in distribution power system. With the trend of a large number of DG penetration, researches on the maximum integration capacity of DG become a hot research topic. A multi-objective optimization model with objective functions of the maximum DG output, network losses and voltage stability index are formulated. Particle swarm optimization (PSO) algorithm is adopted with variable inertia weight to calculate the maximum DG output. IEEE 33-bus test system with DG units is taken as one example to compute the maximum integration capacity. The results show that the proposed method is reasonable and effective.
Optimal Power Flow Considering Generator Number Constraint on Regulation of Active Power Output
Authors: Yang Yu De , Qu Pei Xian
Published: October 2014

Operation number constraint of control means isn’t considered to traditional optimal power flow model, and at optimal solution all the control variables often be changed, which causes a tedious dispatching plan and is difficult to operate. In this paper, Optimal Power Flow (OPF) with constraints limiting the number of control actions was discussed, and 0-1 discrete variables of model was transformed to complementary constraint, then modern interior point algorithm was used for solving. Through simulation the relationship between generator number constraint on regulation of the active power output and optimization objective was explored, which could obtain best balance point on two, and close to conventional OPF optimization objective with reducing the number of regulation.
Optimization of Relay Graph Splicing Based on Repulsion-Tension Algorithm
Authors: Gao Xu , Du Li Yan , Li Xue Dong
Published: October 2014

At present, distributed integration setting calculation mode is widely used in power system. However, there are cross and overlap issues in protection relay model splicing process. Deeply researched in the characteristic of integrated relay splicing, according to power system network topology, an intelligent substation locating method based on the repulsion tension algorithm is applied in this paper. Finally, an example is used to verify the feasibility of the method.
Quantitative Analysis of the Fluctuation Reasons of Grid Line Loss Rate
Authors: Zhang Yu Ze , Liu Wen Ying , Wang Wei Zhou , Zheng Jing Jing
Published: October 2014

While analyzing the line loss, power supply enterprise always encounters circumstances in which the line loss rate swings heavily, especially during the months when there exists season alternate or long vacations, the fluctuation range of the line loss rate grows larger, and it will be apparently on the high side or on the low side. This text figured out the major factors influencing the fluctuation of the line loss rate, quantitatively analyzing three factors’ effects on line loss rate, which respectively are non-correspondence electric quantity for supplying and selling, the dedicated line which large consumer load transfers and the change of electric quantity which is nondestructive for sale, thus facilitating the grid enterprises dynamically analyzing the line loss in time, providing authentic line loss data for electric power departments at all levels, electricity board, power supply station, improving the accuracy of line loss analysis, dismissing the human factors during the fluctuation of line loss.
Smoothness Prior Approach to Removing Nonlinear Trends from Signals in Identification of Low Frequency Oscillation Mode
Authors: Wang Yu Jiang , Li Jian , Xu Hui , Yan Hai Ou , Yuan Jia , Li Jun Hua , Liu Xiao Hui , Zhou Qi , Li Na
Published: October 2014

The online identification of low frequency oscillation mode based on measured signal from PMU is the base of damping control. Removing nonlinear trend from the signal effectively can ensure the precision of mode identification. A method named smoothness prior approach (SPA) is proposed to remove the nonlinear trend from measured signal. In order to meet the demand of removing nonlinear trend for identification of low frequency oscillation based on analyzing the basic principle of smoothness prior approach, it determines regularization parameter of smoothness prior approach according to its characteristic of frequency response. It is used to analyze the simulation signals from IEEE-39 bus power system and the measured signals in some power grid, and compared with empirical mode decomposition and digital filter method. The results demonstrate that this proposed method can successfully remove nonlinear trend from the signal and improve the speed of computation, as well as the precision of mode identification, which has a relatively high practical value.
Study on Power Flow Calculation Using PSASP
Authors: Zhang Xin Rui , Zhi Li
Published: October 2014

The power flow calculation is a basic electrical calculation which is to study the steady state operation of power system. Its task is to decide the whole system running state according to the given operating conditions and the network structure. The power flow calculation is the basis of the stability calculation and fault analysis of power system. In this paper, through a four machine 11 node example, we shows that the influence of generator node type on power flow calculation.
The Analysis Method of Potential Loss in Gansu Power Based on DEA
Authors: Sun Ya Lu , Liu Wen Ying , Liu Fu Chao
Published: October 2014

In the matter of huge, widespread, and great workload when facing the issue of loss reduction, finding the wire line loss potential plays a very important role. In this paper data envelopment analysis of C2R model-based, gird line factors as a guide to build the analysis method of loss potential in Gansu power based on DEA, also calculating results according to 2012 Gansu wire line loss statistics. The result is combining with Gansu line loss situation, to discuss and test the validity and reliability of the method.
Divergence Law of Ground Current about DC Transmission System
Authors: Ren Zhi Chao , Wu Guang Ning
Published: October 2014

The calculation formula for divergence of DC grounding current was put forward. The divergence of DC grounding current at different directions in the earth was studied. The main factors include the pattern of electrode, distance between sending end area and receiving end area, earth structure, etc. Some important conclusions were discovered. When observation point is close to DC grounding electrode, the pattern electrode has a big effect on the divergence of DC grounding current. When observation point is far from DC grounding electrode, soil structure has an effect on the divergence of DC grounding current. When the distance between DC grounding electrodes in the sending end area and receiving end area is short, the interaction of two electrodes should be considered.
Optimal Planning on Reactive Power Compensation of Distribution Network Based on Back/Forward Sweep Method and Tabu Search Algorithm
Authors: Wang Xiao Wen , Zhao Yan Hui
Published: October 2014

This paper proposes the optimization method on reactive power compensation of distribution network. The objective is that total loss difference between before being compensated and after should get maximum. The method adopts back/forward sweep method for calculating power flow to obtain total active network loss. Then global neighborhood searching strategy and aspiration criterion for fixed parallel capacitor are established by tabu search algorithm. The optimal installation location and compensation capacity of fixed parallel capacitor are determined. Optimizing simulation on a 34 nodes distribution system is realized, and optimal planning scheme is obtained. Results show that the proposed method is feasible and effective in optimal planning on reactive power compensation of distribution network.
Research on Detection Technology of Distributed Grid-Connected Photovoltaic Power Generation
Authors: Yang Yong Biao , Huang Li , Chen Lu
Published: October 2014

The response, control and fault characteristics of the typical distributed grid-connected photovoltaic generation are described in this paper.And the whole experimental testing platform containing type testing platform, dynamic simulation testing platform and moving experimental process is structured, which describes composition and function of each testing platform. Finally the performance index test of distributed photovoltaic power generation system relying on Shanghai Electric Power Research Institute is carried out. And the experiment results reflect the performance of distributed grid-connected photovoltaic power generation comprehensively.
Fast Service Restoration of Multi-Source Active Distribution Network with Microgrids and Electric Vehicles
Authors: Fan Guang Min , Guo Ling Xu , Liang Wei , Qie Hong Tao
Published: October 2014

The increasingly serious energy crisis and environmental pollution problems promote the large-scale application of microgrids (MGs) and electric vehicles (EVs). As the main carrier of MGs and EVs, distribution network is gradually presenting multi-source and active characteristics. A fast service restoration method of multi-source active distribution network with MGs and EVs is proposed in this paper for service restoration of distribution network, which takes effectiveness, rapidity, economy and reliability into consideration. Then, different optimal power flow (OPF) models for the service restoration strategy are constructed separately to minimize the network loss after service restoration. In addition, a genetic algorithm was introduced to solve the OPF model. The analysis of the service restoration strategy is carried out on an IEEE distribution system with three-feeder and eighteen nodes containing MGs and EVs, and the feasibility and effectiveness are verified
Analysis of the Stator Current Change on QFQS-200 Synchronous Generator Loss of Field Procession
Authors: Lv Yan Ling , Teng Chong , Chen Wen Hai
Published: October 2014

Synchronous generator excitation failure can lead to loss of field, after field loss will lead to the generator lose synchronization. The slip is occurred on the rotor, the generator will absorb a large number of reactive powers from power grid. System voltage is reduced, may make some adjacent point voltage is lower than the allowable values, break the stable operation status between load and power supply, and even make the system voltage collapse; The increased stator current may cause other generator, transformer and circuit overload, make backup protection action, and increase the fault extent; From the perspective of the experimental, this article analyzes the change of stator current in the process of QFQS – 200 synchronous generator loss of field, which provides data for the practical operation of the generator.
The Establishment of Time-Varying Parameter Model of the Synchronous Generator Loss of Field
Authors: Lv Yan Ling , Bai Hong Zhe , Chen Wen Hai , Teng Chong
Published: October 2014

When synchronous generator operates steadily, the slip remains essentially unchanged, and the traditional first-order mathematical model can be used to analyze its operating procedures. But when it occurs asynchronously failure, the traditional model of a first-order mathematical operation can no longer be used accurately to analyze its state. This paper establishes time-varying parameter model considering the rotor eddy based on mutual leakage field winding and straight shaft damper windings resistance, and uses simulation analysis and comparison of experimental verification methods to verify the correctness of the model for synchronous generator asynchronous operation, which provides a theoretical basis.