bluuebunny/crossref_metadata_2025 huggingface dataset:
A New Algorithm to Compensate Ionosphere Phase Contamination
Authors: Ai Hui , Hu Jin Feng , Li Wan Ge , Lin Zhi Rong , Zhang Ya Xuan
Published: September 2014

The echo signals of sky-wave over-the-horizon radar involve ionospheric phase contamination with spectrum expansion. The bragg peaks expand and cover the frequency spectrum of low speed target. So ionospheric phase decontamination is necessary before coherent integration. The traditional Hankel Rank Reduction (HRR) phase decontamination method constructs the Hankel matrix by folding the echo signal, estimating instantaneous frequency through singular value decomposition. But HRR method requires the prior information of signal components. The estimation is invalid without priori information. The algorithm presented in this paper does not require the priori information. The algorithm based on matched fourier transform can accurately estimate the phase contamination function for the clutter noise ratio is high. Simulation shows that the proposed algorithm has better performance in phase decontamination.
Nonlinear Filter Smoothing for Aeromagnetic Vertical First-Order Derivative Contour Mapping on the Scale of 1:250,000
Authors: Tong Jing , Dong Li Na , Zhang Wan , Xia Ling Yan
Published: September 2014

By the analysis of two filter smooth method principle on the platform of Oasis Montaj software,the author of the thesis selected one dimension nonlinear filter method to remove the noise signal of aeromagnetic vertical first-order derivative data, not only smoothing the contour but also enhancing the geological structure edge signal effectively.
Design of Reconfigurable Carrier NCO and PN Code NCO in Satellite Navigation Receiver
Authors: Gong Ping , Wu Xing Cun , Fu Gang
Published: September 2014

The compatible receiver for satellite navigation is the trend of the receiver along with appears a variety of satellite navigation system. The basic structure of carrier NCO and PN code NCO was designed according to the parameters which are determined on the basis of the introduced theory of reconfigurable carrier NCO and PN code NCO. The hardware testing of the designed carrier NCO and PN code NCO had finished in the end, and the result shows that the carrier NCO of and PN code in accordance with the design parameters; therefore ,the design can process dissimilar navigating signal, which is used in the channel processing of reconfigurable navigating signal directly. It is a firm base of researching and exploiting compatible receiver for a variety of satellite navigation system in the future.
Real-Time Positioning Accuracy Analysis of Single-Frequency GPS Based on Ionosphere Grid Products
Authors: Zhou Jian , Wu Xing Cun
Published: September 2014

Firstly, this paper introduces the common methods and accounts for the advantage of ionosphere grid products for correcting ionosphere errors with single-frequency GPS, according the analysis that ionosphere grid product can effectively ameliorate errors of single-frequency GPS navigation and positioning. In detail, this article gives the establishment, forecast and operation methods of ionosphere grid products, and introduces the method that calculates the VTEC (Vertical Total Electronic Contents) values of the geocentric latitude of the ionospheric pierce point, the VTEC values of four-point interpolation models and the single-layer mapping function. It’s also compares different pairs of ionosphere correction data and satellite ephemeris which use to analyze the impact of real-time positioning accuracy of single-frequency GPS. The experiments prove that the predicted ionosphere grid products can obviously improve the precision for single-frequency users, and have some practical values for single-frequency positioning and orbit determination.
The Application of a Linear FM Interference Suppression in DSSS Technology Systems
Authors: Fu Gang , Lin Jian Hua , He Qian
Published: September 2014

Spread spectrum communication system wideband interference suppression technique has drawn increasing attention. In this paper, the typical broadband interference signal interference LFM (Linear Frequency-Modulated, LFM), for example, the results of research focus and reviews the current direct sequence spread spectrum (Direct Sequence Spread Spectrum, DSSS) system wideband interference suppression.
Algorithm of Video Decomposition and Video Abstraction Generation Based on Face Detection and Recognition
Authors: Wu Xiao Kang , Xie Cheng Gang , Lu Qin
Published: September 2014

ion generation based on face detection and recognitionXiaokang Wu1, a, Chenggang Xie2, b, Qin Lu2, c1 National University Of Defense Technology, Changsha 410073, China;a172896292@qq.com, bqingqingzijin_k@126.com,Keywords: face detection, face recognition, key frame, video abstractionAbstract. In order to facilitate users browse the behaviors and expressions of interesting objects in a video quickly, need to remove the redundancy information and extract key frames related to the object interested. This paper uses a fast face detection based on skin color, and recognition technology using spectrum feature matching, decompose the coupling video, and classify frames related to the object into different sets, generate a different video abstraction of each object. Experimental results show that the algorithm under different light conditions has better practicability.
An Improved QIM Watermarking Algorithm
Authors: Lin Zhen Xian , Li Yuan Sheng , Li Jian Tao
Published: September 2014

Put forward an improved QIM watermark embedding algorithm. The carrier image is transformed into YCbCr space, lifting wavelet transform the three components, then using the QIM quantization method embeds watermark into high frequency coefficients of Cb and Cr component, and Y component of low frequency coefficients. The experimental results show that embedded watermark which using improved algorithm has good invisibility. Anti attack test results show that after using common attack method attack the image embedded watermark, it can still extract the watermark completely. The anti-attack performance of improved QIM algorithm is much better than texture watermarking algorithm based on DCT.
The Application of Panoramic Technology in the Protection of Red Cultural Heritage
Authors: Kuang Yang , Jiang Jie
Published: September 2014

The article introduces three-dimensional panoramic technology, and take Fang Zhimin martyr’s cemeter for instance, meanwhile, the process of using panoramic technology to create three-dimensional red tourist sites is described here in detail. It is thought that three-dimensional panoramic technology makes great sense in the protection of red cultural heritage.
Research on a Kind of Processing Equipment of Complex Intersecting Line
Authors: Zhang Zhen Jie , Chen Zhi Ping , Xu En Dao , Shi Hu Li
Published: September 2014

In order to solving the problems in cutting complex intersecting line by traditional methods, this paper provides a kind of milling equipment for processing intersecting line, analyzing and verifies its feasibility, and thus lay the foundation for the intersecting line of curved pipes.
Quality Control of Camouflage Materials Development Project Using Super-Efficient C2GS2 Model
Authors: Liu Jun , Li Ling , Lv Xu Liang , Weng Xiao Di , Zhou Zheng
Published: September 2014

The proposed super-efficient C2GS2quality control model in this article aims at simplifying the assessment of efficient C2GS2decision making units (DUMs) during the process of quality control in camouflage materials project development. Firstly, based on the establishment of quality control index system, DUM itself are removed in reference set. Then DUMs could be sufficiently ranked, according to the compare among every DUM itself and other ones’ linear combinations. Simultaneously, projections of C2GS2quality control model are analyzed to complement the super-efficient theories and several experimental examples are provided.
Thermal-Structural Analysis of Ni-Based Alloy Panel with Active Cooling Thermal Protection System
Authors: Sun Guo , Sun Yuan Gui
Published: September 2014

In hypersonic environments, the development of aircraft engine presents the mitigation of the extreme thermal environment inside the combustion chamber. This paper establishes the capabilities for combustor panel design. By given the key loading and boundary conditions of the panel structure, the thermal structural analysis determines temperatures and stresses and the optimization improves panel’s robustness subject to thermal mechanical loads. A parametric sweep analysis is carried and the results give the optimal value of the panel face thickness.
Finite Element Analysis of Stiffened Composite Panels Subjected by Low-Velocity Impact
Authors: Zhang Wen Chao , Guo Yuan , Guan Zhi Dong , Guo Xia , He Wei , Tan Ri Ming
Published: September 2014

In this paper, the low-velocity performance of stiffened composite panels is investigated experimentally and numerically. In order to illustrate the effect of the stiffener, a number of plain laminates with same lay-up of the skin were impacted in various energies. Progressive damage models based on continuum damage mechanics (CDM) were used in combination with cohesive interface elements to predict the structural response and fracture mechanics of stiffened composite panels. The constitutive mode was implemented into the ABAQUS/Explicit FE code by user-defined material subroutines (VUMAT). The developed FE model made a good prediction about the structural impact response of stiffened panels over the rang of impact energies examined. Very good agreement was achieved between the extent of damage predicted around the impact site and the damage detected by non-destructive technique (NDT) ultrasonic C-scan of the panels.
Changes of Endothermic Peak of Expanded Graphite Based Chemical Heat Storage Materials CaxZny(OH)2(x+y)
Authors: Zheng Mao Sheng , Sun Shi Min , Shi Pei Yi , Hu Jun
Published: September 2014

Expanded graphite is used as framework material in inorganic or organic heat storage materials commonly, of which the function is to improve thermal performance of the relevant materials. However, its negative effect is unclear. In this paper, the change of endothermic temperature of chemical heat storage material CaxZny(OH)2(x+y) by graphite addition is reported. Differential scanning calorimetry (DSC) is employed to perform the measurement. The result shows that the initial temperature and width of the endothermic peak decrease due to the action of the added graphite slightly; Along with the increase of graphite content, the endothermic peak moves to lower temperature further, the width and height of the peak reduce simultaneously.
Study on Surface Composites of In Situ Synthesis V8C7 Particle Reinforced Iron Matrix
Authors: Wang Kai , Wang Liang Liang , Xu Yun Hua , Han Yong
Published: September 2014

This article uses the cast-penetrated-heat treatment process produce V8C7 particle on the surface of iron base composite material, and analyze its organizing appearance using methods such as XRD, SEM, measured its hardness with micro hardness tester of type TUKON2100, operate wear test under different load with wear test machine of ML-100. Results show that the surface of the particle reinforced iron matrix V8C7 composite sample maximum microhardness is 2333 HV0.05. At room temperature, when the load is 15N, its average abrasive resistance is about 13 times that of it of grey cast iron, which improves the wear resistance of the iron substrate to a great extent.
Diversity of Cell Wall Composition and Saccharides Production with NaOH Pretreatment in Bioethanol Material: Miscanthus
Authors: Xu Ning , Dai Ben Lin , Wu Zhen , Mu Fei Hu , Xu Ji Ming
Published: September 2014

Miscanthus is a high yielding bioenergy crop. In this study, we selected four typical pairs of Miscanthus samples which presents different cell wall compositions. After different concentration pretreatment of NaOH (0.5%, 1.0%, 4.0%), four species shows significant difference in saccharine production. Much more xylose was extracted in the supernatant solution; the average glucose yield of all samples was about 2.0% in the concentration of 4.0%, which while the xylose yield was 12.0%. Direct enzymatic hydrolysis of the NaOH presoaked biomass was found to give higher glucose yields of 11–26%, and low xylose yields of 11–15%.Lower concentration of NaOH resulted in distinct differences in both glucose and xylose hydrolysis yields.
A Coordinative Steering Control Method Based on PID Compensation for an Electric Vehicle
Authors: Qiu Hao , Liang Song Feng
Published: September 2014

This paper presents a coordinating steering control method in an Electric Vehicle with Four-in-Wheel-Motors Drive and Four-Wheel Independent Steering. This control method applied a PID compensation to solve the absonant steering problem. This research builds a mathematic model for the control system and uses the Matlab simulation to verify the feasibility and control effect. Then it is applied in a real car environment for further experiment in which the paper studies the control effect with varied control parameters. According to the analysis of the experiment, a practical solution for steering System is proposed with excellent control effect.
Preparation and Characterization of GNP/TPU Composites
Authors: Xu Bao Feng , Lai Sheng , Lin Zhi Dan , Chen Jiang Ming , Lin Jun
Published: September 2014

Graphene nanoplatelets (GNP) and thermoplastic polyurethane (TPU) have been often used as filler and matrix, respectively, to produce composites. In this work, TPU/GNP composites were prepared via a melt blending method. The mechanical properties and frictional properties of TPU/GNP composites were investigated. Because the GNP is very expensive, we investigated to use graphite as the filler, to use PP-g-MAH as the compatibilizer and examined the characteristics of the prepared composites. Frictional properties and mechanical properties of GNP/TPU composites remarkably improve when adding PP-g-MAH as the compatibilizer. Tensile strength of composite containing 10wt % of GNP and 10wt% PP-g-MAH was measured as 25.5MPa. When the graphite was used to replace for GNP, the frictional properties of composites decreased, but the mechanical properties improved.
The Grain Growth of Austenitic Model Steel during Fast Heating
Authors: Yuan Shao Qiang , Liang Guo Li , Yang Yue Hui
Published: September 2014

The metallographic observation, thermo-simulation test and quantitative statistics were used to investigate the grain growth on different parts of the samples for Fe-40Ni-Ti alloy. The experiment results demonstrate that: near the center of the sample corresponding to the summit point of the temperature, the grain grows rapidly in 5s when the temperature reaches 1350°C, whose size is about 180μm; While the grain size of parent metal and HAZ (4mm to the welding line) remains nearly unchanged, whose size is about 80μm. The size of TiN particles in the welding line is fine than that of the parent metal obviously and the hinder to the grain boundaries can be observed. With the aid of Fe-40Ni-Ti alloy, the austenitic grain growth in the steel can be simulated.
Project Application in the Field of Composite Materials in Badminton
Authors: Liu Yang
Published: September 2014

In this article, through the rapid development of badminton, detailed introduces the evolution process of badminton racket, through the use of the badminton racket composites badminton flying speed, also become more and more wonderful and exciting game.
Phase Field Simulation of Dendrite Growth of Coupling Coefficient Effecting
Authors: Li Shu Ting , Yuan Xun Feng
Published: September 2014

The phase field coupling with the temperature distribution field is used to simulate the dendrite growth during isothermal solidification. The effects of coupling coefficient on the dendrite growth are studied. The results indicate that grain shape is hypertrophy dendritic crystal When the coupling coefficient is low. As coupling coefficient increases, the main branch of dendritic crystal become long and thin, and has the stable front interface. When the coupling coefficient is large, the dendrite growth becomes very complicated and the front interface of it is very unstable. Meanwhile, the temperature distribution field of main branch tip increases slowly first, then decreases; in addition to the main branch ,the temperature field increases monotonously.
Analysis for the Computation Method of Crown on Hot Strip Production Line
Authors: Cao Xiang Ping , Chen Yan , Liu Mei Xing
Published: September 2014

In this paper, the computation method of the strip crown is analyzed using the measured strip thickness data on a hot strip product line. The better quality of the strip is achieved for the smaller crown and the closer of the mean thickness to the nominal thickness. The polynomial approximation method for the transverse thickness distribution of the strip is used, and the different degrees of the polynomial are selected for calculating the strip crown. The calculated results are compared with the output of the measuring system in a rolling factory.
The Determination of Low Consumption Repairable Air Materiel Consumption Quota
Authors: He Ya Qun , Li Ji Jun , Wang Tao , Hou Sheng Li
Published: September 2014

Aiming the problem of low consumption air materiel repairable parts consumption quota, the paper creates a calculation model, gives the methods and processes solving the model, and explain the solving process with examples specifically, for the development of air material consumption quota provides an effective approach for air force air materiel system.
Study of Financing Policy on the Development of Strategic Emerging Material Industry
Authors: Liu Cun Ping , Yuan Yong Fu , Yang Yan Xiong , Guo Sheng
Published: September 2014

As the core of modern economy, finance plays a vital role in the development of strategic emerging industries. A rapid progress of these industries demands a well formed financial support system and a full play given to the role financial support. According to emerging industries life cycle theory, the characteristics of new industry and its law of development determine its funding requirement in various stages of development. This paper analyzes the characteristics of strategic emerging material industries and proposes financing policy in its different stage.
The Turbocharger Exhaust Gas Regulator Design and Analysis
Authors: Qiu Li Jun , Xu Su Ying
Published: September 2014

In order to adapt to the needs of internal combustion engine speed variation of the turbocharger. Using waste gas regulator control exhaust gas inlet device. The effect of exhaust gas regulator is for adjusting the gas flow velocity and direction. When the internal combustion engine running at low speed raising the impeller speed. Exhaust gas regulator and axial moving blades rotating blades of two kinds of structure. The axial moving blade structure is changing the way nozzle ring opening work. Rotating blade structure is working on changing the way of blade Angle. Exhaust gas to adjust the turbocharger is a control of internal combustion engine air pressurization value of the speed changes.
Study on Hot Deformation Behavior of a New Titanium Alloy
Authors: Zheng Qun Hui , Wang Ke Lu , Lu Shi Qiang
Published: September 2014

Two-phase titanium alloy sample which initial microstructure is equiaxed have been tested by the Gleeble-3500 thermo-analogue machine with the isothermal and constant strain rate, the constitutive relationship of the titanium alloy was constructed by analyzing true stress-strain curve under different hot deformation conditions and considering the effect of the strain rate, deformation temperature and strain on flow stress synthetically. Error analysis shows that the constructed constitutive relationship has good accuracy, in the range of 900 ~ 1150 °C the error is less than 10% of the data points are accounted for 97.4% of all data points, can conform the requirements of plastic processing.
Reliability of the FDS Simulating on Fire Extinguishing with Straight Stream of Compressed AFFF
Authors: Su Lin , Wang Li Jing , Xue Lin
Published: September 2014

By utilizing the fire dynamics simulation software FDS, simulate the fire extinguishing process of the diesel oil fire and gasoline fire with the compressed air foam agent, and compare it with the actual fire extinguishing test. Verify the reliability and the accuracy of the simulation implemented by FDS software on compressed air foam agent fire extinguishing process under the direct injection.
Strength Analysis of Corn Combine Harvester Chassis
Authors: Hu Dong Fang , Du Yan Ping
Published: September 2014

As the installed base of all other assemblies, the corn combine harvester chassis supports a variety of loads from the harvester and ground, so its reliability directly affects the quality and safety of the corn combine harvester. The analysis of corn combine harvester chassis was carried out with finite element analysis software. First, the 3D part of the chassis was established and simplified in accordance with the relevant principles. Second, the stress distribution and displacement of the chassis in the no-loaded and full-loaded conditions were calculated by meshing,applying loads and constraining boundary conditions. The analysis result is of great significance to enhance the quality and reliability of the chassis.
Application of Study on Liquid Ablation in Laser Propulsion
Authors: Cui Cun Yan
Published: September 2014

It was found that evaporation and thermal elastic stress wave and cavity were dominant phenomenon in laser-induced ablation propulsion with liquid propellant according to our perceptual knowledge established in relative experiment and by analysis of physical mechanism of laser-induced ablation of liquid. The research result of the above phenomenon was introduced in this paper in order to give some elicitations to the researchers who were interested in the mechanism of laser propulsion with liquid ablation.
Investigation on the Electrochemical Micromachining of Micro Holes with Variable Cross-Section
Authors: Wang Kun , Gao Meng , Shen Qi
Published: September 2014

Based on the principle of electrochemical, the processing mechanism of electrochemical machining (ECM) micro holes is analyzed and discussed, the processing model is established and the quantitative relationship is presented between the machining side gap and the electrochemical machining parameters (pulse width and pulse period, pulse frequency, duty ratio, etc.), workpiece material parameters and the parameters of the electrolyte, the electric double layer equivalent circuit constant with mathematical expression. On the basis of the analysis of the effect of processing parameters on the electrochemical machining accuracy and stability, process out the variable cross-section micro hole at an appropriate processing parameters of variable pulse width.
Effects of Zirconium on Impact Toughness for the Hull Structure Steel Plate
Authors: Qi Tie Li
Published: September 2014

The Gleeble3500 combined with SEM, TEM and other experimental methods are employed in this paper to investigate the effects of zirconium content on impact toughness of heat affected zone (HAZ) of hull structure steel plate during the large heat input welding. The results showed when 0.01% zirconium were added in the steel, the impact energy reached 224 J at-60°C experienced 150 kJ/cm welding heat input. But the large-size rectangular inclusions are found in CGHAZ when 0.02% zirconium were added in the steel, the impact energy fell to 38 J at-60°C experienced 150 kJ/cm welding heat input, the large-size inclusions, especially rectangular inclusion, were the main cause for the sharp decline of low temperature toughness after welding.
Magneto-Thermal Simulation Analysis of the Sheet Metal in the Transverse Flux Induction Heating Process
Authors: Zhang Yue Hong , Chen Ya Juan
Published: September 2014

Using the finite element software “ANSYS” to establish the three-dimensional coupled model in magnetic field and temperature field during the process of transverse flux induction heating of ring-shaped heater and Square-shaped sheet steel, this paper studies the distribution laws of the magnetic and temperature fields in the induction heating process. Through studies, the calculations show: 1) The distribution of the magnetic fields and eddy cavities in the sheet workpiece is in the shape of ring; has close ties with the shapes of the coils; 2) The intensities of the coils’ magnetic field and eddy cavities reach the strongest in the projection of sheet metal, and the temperature in the projection part also rises the fastest. For the purpose of verification, the induction heating experimental plat is established to measure the changes of temperatures of numerous points in the plat and to compare the changes with the calculations. Via the comparison between the simulation results and the experimental measurements, the results of numerical simulation are confirmed reliable, and can be used as the theory and the experimental basis for the design of the induction heating system.
Applications of 3D Printing Technology in the Mechanical Manufacturing
Authors: Ma Wan Li , Tao Feng He , Jia Chang Zhi , Yang Jian Chun
Published: September 2014

3D printing technology is one additive manufacturing technology which involves mechanical, electronics, optics, materials and other disciplines. The domestic and foreign research status are introduced. The applications in the mechanical aspect are especially analyzed. The problems in the applications and the prospect are discussed at last.
Panoramic Vision System for Autonomous Driving Vehicle
Authors: Zhou Yu Bin
Published: September 2014

High effective vision system is important for autonomous driving vehicles. A panoramic vision system based on FPGA+DSP with 6-camera for intelligent vehicles is presented in this paper. The system includes digital image acquisition module and high image processing module which work independently to each other. The including two C6416 DSP chips and one high-performance Virtex-4 FPGA to achieve the complex real-time image processing during autonomous driving, such as cylindrical panoramic image rebuilding, lane detection and tracking. The proposed algorithm was also optimized according to the specific characteristics of the hardware for high parallel processing in FPGA and pipelined in DSP.
The Linear Monitoring Analysis of PC Continuous Beam Bridge
Authors: Yang Ya Xun , Gong Gao
Published: September 2014

According to the structure and construction characteristics of prestressed concrete (PC) continuous beam bridge and combined with the construction monitoring method of continuous beam bridge, this paper introduces the girder deflection test technology and method of prestressed concrete continuous box girder bridge, also analyzes the various factors which affect the linear monitoring. And draw the conclusion through the analysis of the deflection and linear monitoring of LinGang big bridge.
Temperature Field Analysis of Concrete Filled Steel Tube Reinforced Concrete Columns in Fire
Authors: Liu Xue Feng , Ren Qing Xin , Jia Lian Guang
Published: September 2014

In this paper, temperature field analysis of concrete filled steel tube reinforced concrete columns in fire has been carried on. A finite element model for concrete filled steel tube reinforced concrete columns in fire is developed by ABAQUS. The cross-sectional temperature field distribution regularity of concrete filled steel tube reinforced concrete columns in fire has been obtained. Parameter analysis such as fire duration time and steel ratio on the column section temperature field is conducted, and this provide the reference for the further analysis of concrete filled steel tube reinforced concrete columns.
Soil Pressure Test and Numerical Analysis on Reinforced Earth Retaining Wall of Green Gabion
Authors: Yang Xiao , Yang Guo Lin
Published: September 2014

Based on reinforced earth retaining wall of green gabion which is built at the site of seventh project Shaoxing-Zhuji Expressway, the research for soil pressure in a cross section which locate at the site of K38+398kmare made by field test and numerical analysis. The horizontal and vertical earth pressure are studied in the construction, The pressures between field test and numerical analysis which depend on FLAC3D are rough similar. With increased of height in filling soil, the earth pressures on the wall toe in 3 direction such as horizon , vertical, 45°are increased ,and then gradually come to stability after construction. With increased of height in filling soil, the vertical earth pressures is increased, but the distribution for earth pressure at the same height is non-uniform. The horizontal earth pressure on the back of wall surface increases fast at first then decreases a little, which is a single peak-shaped, it distributes along the wall height in non-linear form, the maximum occurs at 1/3H. The result between field test and numerical model are different, because the flexible wall surface has a great affection on unload.
Study on the Nonlinear Flow Percolation Law in Low Permeability Carbonate Reservoir of HF Oilfield
Authors: Jiang Shuai , Yang Zheng Ming , Liu Xue Wei , Wang Meng Ting , Zhang Qian
Published: September 2014

With the development of the global oil industry,the production of the normal or high permeability reservoirs decline rapidly. Therefore, more and more low permeability reservoirs are used to the production stimulation. The oilfields overseas make great contribution to CNPC. The HF oilfield is one oilfield that the CNPC have in overseas. The HF oilfield is mainly the low permeability carbonate reservoirs which make it not easy to economically exploit. Due to the reason that the low permeability carbonate reservoirs present small porosity and the fluid’s flow situation in the low permeability carbonate reservoirs, the flow doesn't obey the Darcy's law. Thus it is greatly necessary to study the non-Darcy percolation characteristics. In this paper, the HF ‘s low permeability is tested and the threshold pressure gradient test is finished ,according to the experiment results, the nonlinear percolation ‘s law ,which is suited to HF-oil field , is illustrated and the reservoir classification is achieved.
Comprehensive Evaluation of Low Permeability Sandstone Reservoir Based on Entropy-Weighting AHM
Authors: Lu Xue Fei , Dong Feng Juan
Published: September 2014

To be the result of assessment of the low permeability sandstone reservoir more objective, the new method-- entropy-weighting AHM, and six parameters which reflect the macroscopic properties, micro-structural characteristics and Oil-bearing property: Porosity, permeability, oil saturation, saturation in the value of pressure, back efficiency and clay content of mercury, have been selected to divide flow units of Sanjianfang reservoir in Qiuling oilfield. Reservoir flow units of the research area can be divided into I, II, III3-type reservoirs. The research indicated thatI, II, III3-type reservoirs are always located in different faces positions, and its physical property and oil-bearing properties decrease successively; Evaluation results are well consistent with the actual production of gas and oil. The entropy-weighting AHM method offers a new way for the division and evaluation of reservoir, which is a simple mathematic model with easy operation, but without consistency test and be adjusted to determine the matrix ,and the result of evaluation not only embodies the science, without losing the subjectivity . Hence it offers a brand new way for the evaluation of reservoir because of getting a good assessment result for the multifactor and multi-hierarchy complicated problems.
Variable-Permeability Well Test Model and Pressure Response of Non-Darcy Flow in Low-Permeability Reservoirs
Authors: Lei Xiao , Wu Mu Wang , Zhang Feng Bo , Liu Shuang Qi , Xiang Yao Quan , Lan Wei Xing , Yu Hai Yang
Published: September 2014

Considering the variable-permeability effect of non-Darcy flow in low-permeability reservoirs, this work set up a two-dimensional model with boundaries. The implicit finite difference algorithm was employed to solve the well test model, and typical curves in log-log scale by considering the effects of variable-permeability and non-Darcy flow were obtained. The results show that, in reservoirs with impermeable boundary, the upturned part of the pressure derivative curve caused by boundary effect will be covered by that of non-Darcy effect, indicating boundary effect is postponed to appear. The more of the non-Darcy effects result in less obvious upturn of the typical curves. The upturn of typical curves and the effect of boundary are enhanced by increasing the numbers of impermeable boundaries or by decreasing the distance from the well to the boundary.
Numerical Calculation of Micro-Plie in Slope Engineering
Authors: Tang Xiao Song , Xin Jian Ping , Zheng Ying Ren
Published: September 2014

In order to conduct the numerical simulation of rock and soil slope strengthened by the micro-pile with reinforced bar, FEM strength reduction is combined with the program of FLAC which possesses the function of analyzing tensile and shear failure. The micro-pile is under plastic state due to its mechanic features. Solid element and ideal elastic-plastic constitutive model of Mohr-Coulomb are applied as the rock and soil mass and pile. The calculation model can work out the safety factor of slope, the dynamic changing process of pile deformation and failure, the failure mode of slope after strengthened by micro-pile. Then the structural element of pile is used to simulate piles, which can obtain the bending moment and shear force. The beam element is used to simulate the coupling beam. So the layout principle of inner force before the failure can be calculated.
Scientific and Technological Progress to Promote the Development of Olympic Construction
Authors: Yang Xiao Yan
Published: September 2014

Ever since Pierre GuBaidan and his colleagues restored the Olympic Games at the end of the19th century, the modem Olympic Games have evolved for a. hundred years during which they experienced both hard and exciting moments. Although according to the history, the 1916's, 1940's and 1944's Olympic Games were cancelled because of the war, although frequently chaotic arose from the inside of the organization of the Olympic Games and some external pressure arose from outside of the organization, the modem Olympic Games are still regarded as one of the few successes which elaborate the internationalism. Starting from a humble, indefinite beginning, the Olympic Games gradually grow into a marvelous sporty event in the world; nowadays, not any other event can compare with it in the style, scale or in the complexity of the organization. Each past Olympic Games is an important opportunity for exchanging the ideas in science and cultural, and it also provides a giant stage to the hosting city, demonstrating the hosting city's history, culture as well as the resident's expectation to the audience of the world.
The Evolution of Olympic Venues Construction and Overall Layout
Authors: Yang Xiao Yan
Published: September 2014

The dissertation targets on the evolvement of the Olympic architectures together with the analysis of some concrete historical cases. The dissertation has been divided into two halves, which are logically related. The first half is organized as follows: first, the historically evolvement of the Olympic Games over the past 100 years was illustrated via 4 important phases. Then it concluded the characteristics on the space layout of the Olympic architectures. Finally the technical and economical influences on the Olympic architectures were analyzed in detail. Within the second half, for each of the four characteristic stages, detailed elaborations were launched to cover the unique characteristics of the Olympic architectures in each stage chronologically.
Research on the Extraction and Antibacterial Activity of Tea Polyphenols
Authors: Sun Fei Long , Chen Guo Ni , Wu Bing , Zhu Wei Na , Yan Yang
Published: September 2014

There is an increasing interest in tea polyphenols, as natural plant compounds, in food products and also in pharmaceutical products due to their multiple health care functions. In this paper, a microwave-assisted extraction method was employed for the extraction of tea polyphenols. The effects of microwave power, heating time, and ethanol concentration on extraction of tea polyphenols were investigated by single factor experiments and an orthogonal experiment [L9(3)3]. Results showed that the optimum extraction conditions were that the microwave power was 560W, the heating time was 30s, and the ethanol concentration was 40% (v/v). The antimicrobial properties of tea polyphenols were also discussed. Tea polyphenols had bacteriostatic activity against Escherichia coli and Staphylococcus aureus. This study may be valuable for the extraction and application of tea polyphenols.
The Study of Typical PWR Nuclear Fuel Cycle
Authors: Hong Yue , Jiang Lan Lan , Niu Dong Xiao , Liu Fu Yan , Wang Xiao Yu , Wu Ling Nan
Published: September 2014

This paper analyzed two different types of nuclear fuel cycle which refferred to one-through fuel cycle and close fuel cycle (uranium-plutonium fuel cycle). Based on specific economic elements related to each cycle process, this paper built a model to evaluate PWR nuclear fuel cycle’s economy. Then, for given data of PWR, empirical analysis and sensitivity analysis were carried out. The result showed the superiority of the close fuel cycle compared to the one-through cycle.
Performance Analysis of PEM Fuel Cell Using Pulsation Approach
Authors: Xiao Yan , Jia Qiu Hong , Li Chao , Chang Ying Jie
Published: September 2014

Fuel cell operation with a dead-ended systems anode reduces fuel cell system cost, weight, and volume because the anode external humidification and recirculation hardware can be eliminated. However, water accumulation is one of the key factors which influence the stability of its performance. Generally, the anode flooding of PEMFC with anodic dead-end operating mode can be avoided by using periodic purge process. But such an operating method can lower the utilization efficiency of hydrogen because small amount of hydrogen is expelled out of fuel cell and wasted. In order to improve the utilization efficiency of hydrogen, the pulsating technique at anode has been proposed. In this paper, the investigation of the hydrogen pulsation effects for PEMFC stack has been made, with only continuous hydrogen supply, with between continuous hydrogen and pulsation hydrogen at different positions, such as the inlet or outlet of anode. The results shows that the performance of a PEMFC stack has been improved significantly when the pulsation hydrogen flow introduced from the outlet at anode.
Identification of Important Proteins in Protein Interaction Network Based on SVM
Authors: Zha Yan Li , Luo Wan Cheng
Published: September 2014

Importance of proteins are different to perform functions of cells in living organisms according to the relevant experiment results, and more essential proteins is the most important kind of proteins. There are recently many computational approaches proposed to predict essential proteins in network level through network topologies combined with biological information of proteins. However it is still hard to identify them because of limitations of topological centralities and bioinformatic sources. And more it is the challenge is to perform better with less resources. Therefore in this paper, we first examine the correlation between common topological centralities and essential proteins and choose a few particular centralities, and then to build a SVM model, names as TC-SVM, for predicting the essential proteins. The new method has been applied to a yeast protein interaction networks, which are obtained from the BioGRID database. The ten folds experimental results show that the performance of predicting essential proteins by TC-SVM is excellent.
Study on Spatial Distribution of UVA Radiant Intensity for Ballast Water Treatment
Authors: Zhang Man Xia , Yuan Cheng Yu , Shi Lei , Shi Wen , Zhu Yi Min
Published: September 2014

UVA is seldom applied in UV inactivation or disinfection, however, it may be more suitable for underwater photo-catalysis treatment. Since the wavelength of UVA is longer than UVC, the former has higher transmission ability and encounter less disturbance of suspending substances in water. Also, the exciting wavelength of UVA is between 365nm and 413nm which coincides with the wavelength of UVA. Hence, the spatial distribution of UVA radiation is studied for a 15W UVA lamp. The decaying tendencies of UVA radiation intensity were probed over horizontal and vertical distance, behind large amounts of experimental data. Optimal radiation conditions plan to be detected based on the research to guide the UVA treatment.
Determination of Rhodium in Rhodium Octanoate Organic Waste Liquid Using Teflon Pressure Vessel-Assisted Sample Digestion and ICP-OES
Authors: Pan Jian Ming , Wei Xiao Juan
Published: September 2014

A novel method for the determination of rhodium in rhodium octanoate organic waste liquid samples was established by inductively coupled plasma atomic emission spectrometry after samples digested by Teflon pressure digestion vessel with aqua regia. Such experiment conditions were investigated as the influence of sample dissolution methods, digestion time, digestion temperature and interfering ions on the determination. Under the optimized conditions, the linear range of calibration graph for Rh was 0 ~ 150.00 mg L-1, and the recovery was 96.20% ~ 102.36%. The relative standard deviation (RSDs) for Rh was 1.75 %. The proposed method was applied to determine the same samples with atomic absorption spectrometry with the results consistently, which is suitable for the determination of rhodium in rhodium octanoate organic waste liquid samples.
Hydrodynamical Analysis on the Arrow
Authors: Zhou Ji He , Long Xiao An
Published: September 2014

The water tunnel and wind tunnel test carried on the arrow aims to have a better understanding of the hydrodynamics performance of arrows and to improve the technical knowledge of the archery movement Through the experimental research, we can draw conclusions as follows: within the range of angle of attack ( -6°---6°), the arrow can keep the state of attached flow: The state of flow of the arrow with spiral plastic pinna is better than that of arrow with straight one; Within the experimental angle of attack, the lift coefficient Cy will become larger with the pitching moment coefficient Mz getting smaller with the increase of the angle of attack. The arrow has the vertical static stability; with or without arrow feather will have great impact on lift force Y and pitching moment coefficient Mz; the feather rolling will have some impact on lift coefficient Cy, The arrow feather is the main components to produce lift force Y and to give the arrow body relatively great static stability.
Research on the Flotation Experiment of a Low-Grade Barite Ore in Myanmar
Authors: Wang Hong Jun , Dai Hui Xin , Yang Wei Lin , Li Ting Ting
Published: September 2014

This paper introduces the research on the beneficiation of a low-grade barite ore taken from Myanmar.Through the analysis of the ore properties and research on the flotation experiment, the optimum flotation conditions are determinedwhile the ore sample assays 64.32% BaSO4.Under the flotation conditions of the grinding fineness-200 meshes 80%, sodium oleate 800g / t and sodium silicate 500 g / t, “two-time roughing,one closed cleaningand open in the second cleaning operations” is applied, and two marketable barite concentrates can be obtained. The concentrate 1 and 2 contain 96.32% and 91.26%BaSO4 at the recoveries of 91.94% and 5.25%, respectively.
A Learning Method for Predicting the Binding Strength in RNA-Protein Complexes
Authors: Wang Tong , Xue Jian Xin , Xia Tian
Published: September 2014

Hydrogen bond and van der Waals interactions between protein and RNA are important. We have developed a set of algorithms for predicting RNA-Protein binding strength by analyzing hydrogen bond and van der Waals interactions between protein and RNA. Firstly, we must identify the RNA-Protein binding sites. In this study, we use features including Pseudo Position-Specific Score Matrix (PsePSSM) computed by PSI-BLAST and Dipeptide Composition (DC) as feature vectors. Then, the classifier is employed to identify the residues that interact with RNA in RNA-binding protein. Then, take into account the number of amino acids hydrogen bonding and van der Waals forces to any nucleotide, the binding strength is calculated. Finally, fuzzy sets method is adopted to predict the binding strength is strong or weak. Our experiments show that the above methods are used effectively to deal with this complicated problem of predicting RNA-protein binding strength.
Temporal and Spatial Distribution Pattern of Carbon Sink in Forest Vegetation of Jiangxi Province
Authors: Zhang Qiu Gen , Wang Shi Fen , Zhang Yang Jian , Wu Jing Yi
Published: September 2014

Forest ecosystem has a huge carbon sink function and plays an inhibitory effect on global climate warming. The carbon storages of Jiangxi province forest vegetation between 1984 and 2003 were estimated by an age-based volume-to-biomass method according to the forest resource inventory data of the homologous periods. The results showed that the total vegetation carbon storage of Jiangxi province forest vegetation in the four periods was 101.86TgC, 124.1TgC, 157.3TgC and 188.78TgC respectively. The total vegetation carbon storage of Jiangxi province forests had increased 86.92TgC and accumulated about 4.35TgC per year from 1984 to 2003. The average forest vegetation carbon density was between 22.77t/hm2 and 25.94t/hm2. The spatial pattern of forest vegetation carbon storage in Jiangxi province was studied according to forest resources survey data during 10th five-year plan. The results showed that the largest forest vegetation carbon storage was the Ganzhou city (62.36TgC) and the least was Nanchang city (1.72TgC). The average carbon intensity of all city forest vegetation in Jiangxi province was roughly from 20.641t/hm2 to 32.930t/hm2. The smallest carbon density was Nanchang city (20.641t/hm2) while the biggest was Jingdezhen city (32.930t/hm2).
Study on the Mechanism of Resonance Inducing V-Shaped Notch Tip Crack
Authors: Zhang Li Jun , Li Le Le
Published: September 2014

In low-stress precision cropping, a method by which the tiny crack in metal bar V-shaped notch tip can be induced by resonance has been proposed. The critical loading acted on the bar is obtained. The amplitude of bar is calculated under the action of critical loading. The experiments for resonance inducing V-shaped notch tip crack is also carried out. The results show that the V-shaped notch tip can engender tiny crack under the action of resonance force.
Effect of Hg in Jiaozhou Bay Waters-Transfer Processes
Authors: Yang Dong Fang , Min Suo Tian , Ge Hong Guang , Song Feng Min , Liu Zhi Feng
Published: September 2014

Jiaozhou Bay is located in the south of Shandong province, and is around by economic developed cities such as Qingdao, Jiaozhou and Jiaonan etc. Previous studies showed that this bay had been polluted by mercury ( Hg) in certain level. This paper is a summary of previous studies, in order to reveal the transfer process of Hg, including 1) the variation of Hg content, 2) the pollution sources of Hg, 3) land transfer process of Hg, 4) aquatic transfer process of Hg, and 5) settling process of Hg. The results of this paper were meaningful to the control of Hg pollution.