bluuebunny/crossref_metadata_2025 huggingface dataset:
Using Biomass Ashes in Concretes Exposed to Salted Water and Freshwater: Mechanical and Chemical Properties
Authors: Barbosa Rui , Dias Diogo , Lapa Nuno , Mendes Benilde
Published: November 2012

The main aim of this work was to assess the possibility of using biomass ashes as substitutes for cement and natural aggregates in concretes without compromising their mechanical and chemical properties. Thirteen concrete formulations were prepared with different percentages of bottom and fly ashes produced at a forest biomass power plant. These formulations were submitted to mechanical compressive strength assays, after 28, 60 and 90 days of maturation. The reference formulation F1 that was produced without biomass ashes and one formulation incorporating fly and bottom ashes, F4, were selected for further characterization. After 90 days of maturation, the selected formulations were submitted to the leaching test described in the European Standard EN12457-2 (L/S ratio of 10 L/kg, in a batch extraction cycle of 24h) by using two different leaching agents: a synthetic marine medium (ASPM medium) and a synthetic freshwater medium (ISO 6341 medium). The eluates produced were submitted to chemical characterization which comprised a set of metals (As, Sb, Se, Cu, Zn, Ba, Hg, Cd, Mo, Pb, Ni, Cr, Cr VI, Al, Fe, Mg, Na, K and Ca), pH, SO42-, F-, dissolved organic carbon, chlorides, phenolic compounds and total dissolved solids. The substitution of 10% cement by fly ashes has not promoted the reduction of the compressive strength of concrete. The new formulation F4 has presented emission levels of chemical species similar or even lower to those observed for the reference formulation F1.
The Effect of Chemicalattack of some Organic Acidic Solutions to Self Compacting Concrete (SCC)
Authors: Al Khafaji Jabbar Abbas Jabir , Al Maimuri Najah Mahdi Lateef , Al Sa'adi Abdul Hadi Meteab Hassan
Published: November 2012

A study of a mechanical performance(Compressive strength, flexural strength, and splitting tensile strength)of self-compacting (SCC) and conventional (NCC)concretemixes and some physical properties of the mixes made of Portland cement under the effect of acidic solution attackare made. Trichloroacetic and Salicycilic acids are selected and used in this study. It is found that the reduction percentage in compressive strength is about 6% and 3% under the effect of Trichloroacetic acidic solution whereas itisabout 8% under the effect the salicycilic acidic solution attackfor both SCC and NCC mixes after 62 days of treatment for bothSCC and NCC mixes respectively. The reduction percentage in flexural strengthisabout 27% and 37% under the effect of the Trichloroacetic acidic solution attack whereas itis about 59% and 79% under the effect the salicycilic acidic solution attackfor both SCC and NCC mixes respectivelyafter 62 days of treatment. The reduction percentage in splitting tensile strength is about 60% and 63% under the effect the Trichloroacetic acidic solution attack whereas it is 70% and 88% under the effect of the salicycilic acidic solution attack% for both SCC and NCC mixes after 62 days of treatment. At the age 90 days, the SCC and NCC mixes have a reductionpercentage in the cubes weight of 3% and 4% whereas there is an increasing in volume of 0.3% and 0.4% respectively under the effect of salicyclic acid solution attack.It is observed that SCC mixes offer more resistant and less deterioration against acidic solutions attack.
Design of Portable Fault Diagnosis System for Reciprocating Machinery
Authors: Wang Li Yong , Gu Yu Hai , Wu Guo Xin
Published: November 2012

This paper discusses disadvantages of existing diagnosis fault system for reciprocating machinery, and based on structural characteristics and operating principle of the reciprocating machinery, it also presents that a portable fault diagnosis system of reciprocating machinery shall be composed of three parts: sensor, data acquisition device and hand-held terminal, in which the data recorder is mainly prSovided for signal conditioning, A/D for data conversion and transmission, and hand-held terminal for data receiving and processing, fault diagnosis, display and storage. The experiment and tests show that this portable fault diagnosis system is feasible for field online monitoring of status and fault diagnosis for reciprocating machinery.
The Application of Tunnel Monitoring and Measurement in Yanjia Tunnel of Guzhu Expressway
Authors: Duan Bao Fu , Zhu Ying Lei , Mao Xiang Pu , Liu Bo
Published: November 2012

Fault fracture zone with rich water has some bad geological conditions such as low strength, deformation, strong water permeability, poor water resistance. This paper is based on Yan-jia Tunnel in HuBei-Guzhu Highway. WSS is taken as the advanced support method and has improved the construction condition. the construction method of meshshotcreting firstly is adopted. The result of numerical simulation with ABAQUS is basically consistent with the field measurements, which has significance on the subsequent design and construction of underground projects with similar geological conditions.
Real-Time Monitoring Unit of Traffic Flow
Authors: Zhang Ting , Song Zhan Wei
Published: November 2012

With the sustained growth of vehicle ownerships, traffic congestion has become obstacle of urban development. In addition to developing public transport and accelerating the construction of rail transit, use scientific managing and controlling method in real-time monitoring traffic flow to divert the traffic stream is an effective way to solve urban traffic problems. In this paper, cross-correlation algorithm is used to obtain real-time traffic information, such as capacity and occupancy of a lane, so as to control traffic lights intelligently.
Use Electron Micro Technology to Study Microcosmic Structure and Mechanical Properties of Si3N4/Nanon SiC Multiphase Ceramics
Authors: Li Qing Tian
Published: November 2012

The microstructure characteristics of Si3N4/nanometer SiC multiphase ceramics material was studied by electronic microscopy, and the different of the nanometer multiphase and the single-phase Si3N4 ceramics microstructure was analyzed. The relations of the multiphase ceramics material mechanical properties and the microstructure were discussed. The nanometer grain in material restrain Si3N4 crystallinity, improve the mechanical properties of material. Nanometer multiphase ceramics is a new kind of ceramics material which developed in several years, in which Nanometer crystalline grain is smaller than 500nm, because of its small crystalline grain and interface out of order, it has much better feature than that of traditional ceramics materials, it is one of directions on which ceramics material develop in future[1]. The study shows, the temperature indoor strength and toughness is higher 2-3 times than single set material in nanometer multiphase ceramics, at temperature indoors, toughness, strength and anti-creep etc improve a lot[2]. Use high resolving power analyzing technology and electron diffraction analyzing technology of transmission electron microscope can distinguish crystal size, appearance distribution form, dislocation and crystal boundary phase of different material in one sample, in the order to study deeply the relation between microcosmic structure feature of the material and mechanical properties and valuable information to improve material.
A Local Feature Based Fusion Algorithm for Fire Detection Image
Authors: Yang Yun , Liu Sheng Peng , Fang Shu
Published: November 2012

Image fusion is an very important process for fire detection, it generates a single combined image that contains a more accurate description of the fire scene than multiple images from different sources. In this paper, a local feature based fusion algorithm for fire detection image is proposed. Using the non-subsampled contourlet transform (NSCT), each of the visual and infrared fire detection images is decomposed into a low frequency and a set of high frequency subbands. Then the fused coefficients are generated by applying different local feature measure to the low frequency and high frequency subbands, respectively. And the fused image is obtained by taking inverse NSCT. Experimental results indicate that the proposed method outperforms other methods in both of fire target enhancement and background detail preservation.
Research on Precision Measuring System for Motor Speed
Authors: Gu Yu Hai , Han Qiu Shi , Xu Xiao Li , Zhang Hai Tao
Published: November 2012

In order to improve accuracy of measuring motor speed in precision motor control systems, a method of precise measurement of speed with CPLD is proposed, which measures the truncated parts of the measured pulse on the basis of measuring raster count pulse within the equal period, and takes them as compensation, thus improving accuracy of measuring the raster pulse. In this paper, a speed measuring formula is given. Measuring system is provided with parallel and serial communication interfaces for output of measurement results.
Design of Vehicle Dynamic Weighing System Based on S3C2440
Authors: Wang Wei Tao , Zhang Hai Ning , Chen Chao Bo , Li Bin
Published: November 2012

In order to satisfy the need for vehicle dynamic weighing in over-loading detection, the software and hardware of system are designed. The system uses CS5530, which can achieve 24-bit performance, as its AD converter. Apply with the technology of the radio frequency(RF) and embedded operate system, the system can collect, send, display, store and print the information of vehicles in time.
The Design of Power Quality Online Monitor Device under Smart Grid
Authors: Chen Zhen Ping , Liu Huai Xia
Published: November 2012

With the development and construction of smart grid, more and more attentions have been paid to the detection of power quality. Study the disadvantages of wired communication network, applied wireless sensor network technology to power quality online monitoring system. Introduced the hardware and software architectures, designed the detection node and gathering node based on CC2430 and LPC2214 respectively, introduced the establishing process and algorithms of WSN based on ZigBee technology. Experimental results show that, the system can remotely monitor power quality of monitoring points on the power grid, can optimize the power grid operation, and provide enterprises with a reliable basis for energy conservation and emissions reduction.
Research of Rail Pressure Characteristics of Common Rail Fuel System
Authors: Qiu Tao , Peng Jing , Yu Cong Wei , Lei Yan , Li Xu Chu
Published: November 2012

The control of the rail pressure is quite important for a common rail (CR) fuel system since the precise rail pressure control is the basis of optimization for many controlling parameters for CR fuel system, and has a great impact on engine power and emissions. This paper presents the experimental investigation of rail pressure characteristics of a CR fuel system. The rail pressure was tested in varied operation conditions with different boundaries and control parameters. The transient rail pressure characteristics were acquired. Furthermore, the pressure fluctuation was analyzed by means of frequency-domain method. This research shows that the pressure fluctuation in the fuel rail is induced by fuel pump and injectors but not the flow measurement unit.
The Influence of General Disturbances on the Hammerstein Model Identifications
Authors: Yao Jie , Zhu Yong Hong , Wang Jiang Hong
Published: November 2012

The linear dynamic Hammerstein model presents some static nonlinearity. The predominant method to estimate the components of this model is to minimize the error between the simulated and measured outputs. Taking the Gaussian input signals into account, we can estimate the linear part of the Hammerstein model by using the Buss gang’s classic theory. Accordingly, considering the case in point with the general disturbances, we come up with the maximum likelihood methodology.
Application of Human-Computer Speech Interaction in Dispatching System
Authors: Yang Liu Qing , Jiang Bao Chen , Wang Cheng You , Wang Jian Gong
Published: November 2012

With the rapid development of power market, the intelligent dispatching plays a central role, so that the dispatchers are in the presence of a great quantity of challenges. In order to lessen the dispatchers’ burden and raise the working efficiency, this paper proposes a project of integrating the speech technology into the intelligent dispatching system. The project is designed and implemented on the Microsoft Speech API (SAPI) platform. The main components of the system are speech training, grammar compilation, speech recognition, keyword extraction, inquiry backstage and speech synthesis. In the next stage, optimizing grammar and building high performance will be paid more attention.
Research on the Diagnosis Method of the High-Speed Rolling Bearing
Authors: Tian Ying Zhong , Zhang Ming , Li Ming
Published: November 2012

The rolling bearing is the common component in machinery, especially the high-speed rolling bearing. The running state will influence the performance of the whole machine directly. In this paper, it will analyze the design of filter and the fault characteristics frequency. And, through the examples, the paper designs the testing system and verifies the method effectively and reliably.
Study on Simulating Characteristic Parameters of PEMFC Using MATLAB/SIMULINK
Authors: Han Cong , Liu Pei , Wang Tong
Published: November 2012

A computer simulation program is presented for simulating the characteristic parameters of proton exchange membrane fuel cells (PEMFC) by using the MATLAB/SIMULINK and Visual Basic (VB). The simulation program is developed based on the empirical models for PEMFC. The simulation results show that the developed simulation program can be used as a useful tool for simulating the characteristic parameters of PEMFC.
Research of Substation Visualization Based on 3D Panoramic and Geometric Modeling Technology
Authors: Zhao Chun Lin , Yuan Hao , Wang Jian Gong , Wang Liang
Published: November 2012

By combining three-dimensional panorama technology with geometric modeling technology, the models of the primary and secondary equipment of substations are built to get a three-dimensional (3D) virtual environment. This method makes it easy to view the equipments and improves the integration of substation monitoring information. This paper analyzes and discusses two kinds of solutions which are based on Virtual Reality Modeling Language (VRML) and Open Scene Graph (OSG) together with Qt as the main technologies.
Numerical Simulation of Different Schemes’ Influence on Coastal Areas for Groundwater-Source Heat Pump Engineering
Authors: Pan Jun , Li Shi Xiao , Liu Chang , Li Yang
Published: November 2012

More and more people have take more attention on the problem like Seawater intrusion, The same floor recharge and "heat transfixion". This article has established the groundwater flow and solute transport and temperature coupling numerical model,to simulate the underground water temperature’s change by changing the wells’ spacing manner. Simulation results show that the two kinds of disposing Wells solutions are not cause seawater invasion, the second disposing Wells scheme help to prevent the occurrence of seawater invasion.
The Application Research on Voxel-Based Expression of the Virtual Geographical Environment
Authors: Jiang Bing Chuan , Xia Qing , You Xiong
Published: November 2012

Due to the nature of the two-dimensional features of traditional “surface model” method for building the virtual geo-graphic environment, it is difficult to realistically simulate the real world of three-dimensional body. In this paper, fully understanding the basic concepts of voxels and features, based on the analysis of octree voxel model and rendering, we focus on the voxels in a virtual three-dimensional topography of the geographical environment for the simulation of natural phenomena, the expression of geographical process, spatial analysis and its research in the application. Also we discuss the virtual geographic environment which is based on “volumetric model”.
3D Creation Methods Based on User Coordinate System of AutoCAD
Authors: Hu Feng Ju , Liu Ji Xin , Wang Na
Published: November 2012

This paper mainly introduces the methods and advantages of creating three-dimensional entity by the user coordinate system (UCS). The example of the operation details the operation method and skill of the UCS entity . This makes the creation process of the 3D entity clear, simple, and quick.
Joint Modeling of DFIG-Based Wind Turbines for Structural Load Characteristics Analysis
Authors: Song Zhan Feng , Geng Qiang
Published: November 2012

To study the structural loads of wind turbines under grid faults, this paper introduces the concept of co-simulation in the load characteristics analysis of wind turbines under voltage dips and a complete model including both mechanical and electrical parts is constructed. A combination of different simulation packages is used to model the electrical and mechanical aspects of a wind turbine respectively. To demonstrate the co-simulation modeling method can be applied to analyze wind turbine structures, a reference model based on the industry-accepted wind turbine analysis code is also established. A side-by-side comparison of response predictions is further performed between co-simulation strategy and industry-accepted wind turbine analysis code.
A Novel HCI Platform for Power Control System
Authors: Li Xiang , Liu Yue , Yang Tao , Xie Jing Hui
Published: November 2012

In this paper we present a novel HCI (human-computer interaction) system and develop a prototype based on the characteristics of the power control system. This system includes multi-touch input module, laser pointer input module and arc projection-based tiled display module. Users can use their fingers, gestures and laser pointers to control the multi-touch platform; they can also use laser pointers to control the arc projection display system and see the feedback results through the multi-touch projection display and arc projection display. The system can make the power control system more effective and convenient because of its natural and comfortable interaction mode as well as its multi-user feature.
The Knowledge Sharing Based Reinforcement Learning Algorithm for Collective Behaviors of Mobile Robots
Authors: Song Yong , Liu Bing , Li Yi Bin
Published: November 2012

Reinforcement learning algorithm for multi-robot may will become very slow when the number of robots is increasing resulting in an exponential increase of state space. A sequential Q-learning base on knowledge sharing is presented. The rule repository of robots behaviors is firstly initialized in the process of reinforcement learning. Mobile robots obtain present environmental state by sensors. Then the state will be matched to determine if the relevant behavior rule has been stored in database. If the rule is present, an action will be chosen in accordance with the knowledge and the rules, and the matching weight will be refined. Otherwise the new rule will be joined in the database. The robots learn according to a given sequence and share the behavior database. We examine the algorithm by multi-robot following-surrounding behavior, and find that the improved algorithm can effectively accelerate the convergence speed.
The Vehicles ESP Test System Based on Active Braking Control
Authors: Zhang Lu , Wang Guo Ye , Chen Guo Yan , Zhang Zhong Fu
Published: November 2012

This paper proposes an active braking control dynamical system in order to establish a safe and efficient vehicle driving stability control test system. Aiming at Chery A3 sedan, set up the active braking control dynamic simulation system base on MATLAB/Simulink. Adopting the brake driving integration ESP control strategy, analyze and verify the stability control performance of independent vehicle system and vehicle ESP test system based on active braking control respectively in under steering and excessive steering two test conditions. The analyzing results indicate that the test system based on active braking control can effectively assist vehicle travelling in the absence of ESP control or ESP control system failure; when vehicle has ESP control system, the driving stability control performance of this system and independent vehicle system has remarkable consistency. The active braking control system provides a basis for research of vehicle driving stability control test.
Studying on Expert Control System Used in the Electromagnetic Drying
Authors: Wang Zheng Shun , Dou Yu , Zhou Chang Jian
Published: November 2012

Starting with single loop, on the base of electromagnetic drying system, simple mathematical model for paper-drying control was studied by experimental modeling and an model for drying loops of dryer was gained. The interrelation among each loops was analyzed, and a bridge among them was set up combing with worker’s experience. The coordinated control between single drying loop and several drying loops under expert control was summarized, and the system design and the program of the whole paper-drying control loops were designed.The studying of the application has shown that expert control is advanced and effective on both equipment and control precision.
The PID Control System for the Electric Buses Battery Swap Robot
Authors: Tan Lin , Zhao Jin Long , Huang De Xu
Published: November 2012

In order to meet the development of the domestic electric car and to adapt to changes in the height of the bus to avoid damage to the battery and the body of the bus in the process of changing batteries, this paper designs a robotic system based on dynamics visual servo control system for the electric buses battery swap robot following the target, The robot consists of X, Y, Z three freedoms and the R-axis, T-axis freedoms which can adjust the battery angle relative to vehicle chassis and follow the changes of the height of the bus. In this paper, we design the robot using of robot dynamics visual servo technology, path planning, multi-axis motion control technology, multi-sensor technology and PID control theory. The system is stable, reliable and can rapidly follow the changes of the height of the bus by the system debugging and trial operation, achieving a rapid supply of energy to electric buses.
The Design and Implementation of Orchard Long-Distance Intelligent Irrigation System Based on Zigbee and GPRS
Authors: Hou Jia Lin , Hou Rui , Gao Dong Sheng , Shu Huai Rui
Published: November 2012

Combining with the modern orchards’ large-scale development mode and requirements of precision agriculture construction, we designed an orchard long-distance intelligent irrigation system. GPRS network and ZigBee wireless sensor network composed of microcontroller, soil moisture sensor, zero-pressure solenoid valve and CC2430 are used in this system to transmits and control the data. By analyzing the soil’s water content of the sample and combining the advanced setting threshold, the system can send order to control the zero-pressure solenoid valve so that the long-distance control and intelligent irrigation are achieved. When puts into practice, the system shows a stable performance. It meets the design requirements in data acquisition, data transfer and long-distance control and deserves better promotion.
Study of Direct Torque Control System of Matrix Converter Multiple Voltage Vectors
Authors: Yue Zhou
Published: November 2012

In order to reduce torque ripple. Studied direct torque control of motor that fed by matrix converter. Illustrated control strategy the multiple voltage vector of matrix converter. Full utilize big and small input voltage of matrix converter synthesis long, short and zero voltage vector based on direct torque control of motor that fed by matrix converter, through the rational use of long, short and zero voltage vector to reduce torque ripple. The simulation results demonstrated that the validity of theoretical analysis and modulation strategy presented.
Multi-Period Discrete-Time Repetitive Control for Permanent Magnet Linear Synchronous Motor
Authors: Yang Ying Zhen , Cui Chen , Wang Huan , Sun Yi Biao
Published: November 2012

While tracking the periodic input signal, the position-dependent periodic thrust ripple caused by ending effect, load disturbance and the friction of the permanent magnet linear synchronous motor (PMLSM) will reduce the servo performance of the system. Especially when the periods of the reference input signal and thrust fluctuation interference signal are not synchronous, the precision of periodic signal tracked by the servo system is reduced, which lead to the reduction of the servo system’s periodic signal tracking precision. Therefore, a multi-period discrete repetitive controller using two improved prototype repetitive controllers which are incomplete parallel to restrain\track the multi-period input signal was designed. Theoretical analysis and simulation results show that the proposed scheme can improve the precision of the system tracking periodic signals and restrain the periodic thrust fluctuations effectively.
One-Step Synthesis of Thin Graphite Layers Supported CNTs in Porous Copper by CVD
Authors: Meng Di , Shi Chun Sheng , Liu En Zuo , He Chun Nian , Zhao Nai Qin
Published: November 2012

A novel method is described to synthesize carbon nanotubes (CNTs) –thin graphite layer hybrid materials by a one-step catalytic chemical vapor deposition of acetylene on porous copper bulk. In porous copper, graphite thin layer grows uniformly on the surface of the pores while CNTs sprout out to form a network. As observed by scanning and transmission electron microscopy, the obtained CNTs exhibit bamboo-like multiple-walled structures.
Research on Cutting Force and Surface Roughness in Face Milling Ni-Based Superalloy
Authors: Wang Hui , Zhou Feng , Han Rong Di
Published: November 2012

The machinability of Nickel-based superalloy GH4169 is poor, the traditional methods to machining is application of cutting fluids with the active additives which cause environmental pollution and health problems. In this paper, the water vapor was applied on milling instead of cutting fluids for the aim of green milling GH4169. The effects of water vapor, oil emulsion and dry cutting on milling force and the surface roughness have been examined with carbide tools YG6A. The results of experiments indicated that application of water vapor produced lower milling force, the values were reduced about 7 percent compared to dry cutting, and it is advantage in surface roughness. The research results show that clean production was achieved in metal cutting associated with water vapor cooling and lubricating.
Research Developments on Improvement of Spray Cooling Performance
Authors: Wang Yu Qiang , Liu Ni , Xu Xiao Jiao
Published: November 2012

Spray cooling is considered to be one of the most promising electronic cooling methods, since it has several unique advantages such as high heat dissipation, small ﬂuid inventory, and uniformity of heat removal. However the spray cooling performance could be further improved, which can be expressed by the combination of a better heat removal capability, a higher cooling efficiency, and the more uniform surface temperature distribution. In this paper, recent research developments on spray cooling characteristics under different working conditions are reviewed, possible approaches to improve the spray cooing performance are also proposed. Especially spray cooling systems with both enhanced surface and lower system pressure would be be full of attraction.
Mathematical Model Establishment of Prefabricated Hole Flange-Forming of Equal Diameter Tee Pipe
Authors: Yuan Wen Sheng , Wang Zhong Lei , Li Zhao Dong , Cheng Gang
Published: November 2012

For the difficult problem of the flange-forming prefabricated hole size design for tee pipe, based on the principle that in the deformation zone the length of bore plain wire does not change, make the establishment of a mathematical model of the prefabricated hole flange-forming of tee pipe, and by value solving methods to solve the mathematical model, establish a software system for prefabricated hole flange-forming of equal diameter tee pipe. In order to verify the reliability of this article to build the mathematical model and its solution, taking engineering for example, apply the method of finite element simulation to verify the mathematical model and the solving system, and the results show that the mathematical model constructed in this paper can relatively accurately make calculation of prefabricated hole size of flange-forming of equal diameter tee pipe.
Shape and Size Optimization Design of Finned Brass Tube on the Central Air Conditioning
Authors: Chen Shuang , Zhang Bing Yan , Zhong Jian Hua
Published: November 2012

Finned tube heat transfer process was analyzed in this thesis, the optimal mathematical model of the fin efficiency and fin volume which was acted as the objective function is established based on the model of heat transfer theory. The heat exchanger numerical simulation of finned tube is taken by the ANSYS finite element program in heat transfer process, and the finned tube structure parameters ( fin spacing , fin thickness , fin height) were analyzed , the optimum structure parameters of a set of finned tube were obtained at the same time. These studies will have some guidance on the application of finned tubes.
Film Cooling Adiabatic Effectiveness for Cylindrical Holes Embedded in Multi Trench Configuration
Authors: Abdala Antar M.M. , Elwekeel Fifi N.M. , Zheng Qun
Published: November 2012

In this study, computational simulations were made using ANSYS CFX to predict the improvements in film cooling performance with multi trench. Multi-trench configuration consists of two trenches together, one wider trench and the other is narrow trench that extruded from the wider one. Several blowing ratios in the range (0.5, 1, 2 and 3) were investigated. By using the multi trench configuration, the coolant jet impacted the trench wall two times allowing increasing the spreading of coolant laterally in the trench, reducing jet velocity and jet completely covered on the surface. The results indicate that this configuration increased adiabatic effectiveness as blowing ratio increased. The multi trench configuration increased adiabatic effectiveness up to 100% near the hole, 43% at X/D = 40 and 31% at downstream X/D = 137 for blowing ratio of 3 and no observed film blow-off at this blowing ratio. The adiabatic film effectiveness of multi trench configuration outperformed the narrow trench at different blowing ratios
CT Image Analysis on the Meso-Damage of Construction Waste Recycled Brick
Authors: Han Guo Song , Yang Hai Yan , Jiang Xin Pei
Published: November 2012

Based on industrial CT technique, Meso-mechanical experiment was conducted on construction waste recycled brick to get the real-time CT image and stress-strain curve of brick during the loading process. Box counting method was used to calculate the fractal dimension of the inner pore transfixion and crack evolution. The results showed that lots of pore in the interfacial transition zone mainly resulted in the damage of the brick. With the increase of stress, the opening through-pore appeared and crack expanded, and the fractal dimension increased.
Consequences of Land Use in an Intensive Region in North China Plain
Authors: Yan Jun Xia , Zhang Jian Feng
Published: November 2012

Land use changes and land intensification has played a more and more important role in food production. The environment has been influenced by it greatly. Land use data were derived from several sources: aerial photographs, current land use maps, Second National Soil Survey (SNSS) map, and fieldwork. The aerial photographs, 1:50,000 for both 1980 and 2006 were obtained from the Department of Surveys and Mapping (DSM). Bulk soil samples were collected at 79 sites across Quzhou district. Samples were collected again at the same locations in 2000 and 2006. To compare the soil data of 2006, 2000 and 1980, latitude and longitude of the sampling locations were recorded using the Global Position System at the time of soil collection. The samples site selection was done on behalf of the Second National Soil Survey. A great change had taken place in land use and land use intensification. The changes, which have converted natural landscapes into the use for human, have made a large proportion of the Quhzou’s landscape change greatly.
Blasting Vibration Signals Time-Frequency Analysis Based on S-Transform
Authors: Li Dong Tao , Yan Jing Long , Zhang Le
Published: November 2012

Introduced the theory of S-transform, designed simulation experiment and the frequency components distribution versus time was, verified that the S-transformation method is suitable for blasting vibration signal time-frequency analyzed. Applied it to the time-frequency analysis of measured blasting vibration signals at situ, the results show that S-transform has excellent time-frequency representation ability and higher resolution, reveals the detail information of blasting vibration wave changing with time and frequency, and provides a new way for blasting vibration research. Determined the desired delay intervals through comparing the energy of signal and the time duration of the waveform at characteristic frequency between two-hole blasting vibration signals with different delay intervals.
Design of Photonic Crystal Fibers Based Polarization Splitter with Hollow Ring Defects
Authors: Li Jian Hua , Wang Jing Yuan , Zhang Bao Fu , Xu Zhi Yong , Zhou Hua
Published: November 2012

A novel photonic crystal fibers (PCFs) based polarization splitter is proposed in this paper. It is designed by highly birefringent dual-core PCFs which hollow ring defects are used in its one direction to break the structural symmetry. Compared to the previous methods achieving high birefringence, this new type of PCFs can partly overcome the design and fabrication limitations for the PCF-based polarization splitter. Its transmission properties, coupling lengths for the two orthogonal polarizations and the performance of the proposed polarization splitter are investigated respectively. The results show that a 0.676-mm-long polarization splitter can be obtained. When the splitting ratio is better than -15dB, its bandwidth is about 45.8nm.
Numerical Analysis on Steel Reinforced Concrete Beam-Concrete Filled Steel Tubular Column under Cyclic Loading
Authors: Zhao Chi Yun , Li Hua , Li Li Yun
Published: November 2012

The nonlinear behavior of the full scale test of the composite joint between steel reinforced concrete beam and concrete filled steel tubular column under low cyclic reversed loading are simulated by using finite element software ANSYS. A separated model was used, element concrete solid 65, element shell 181 and element link 8 were used to model concrete material, steel members and steel bars respectively. The numerical analysis results are compared with the data of the experimental research. The advantages and shortcoming of the finite element model are given. A better numerical simulation method and a use for reference to the similar case are expected to be afforded.
Construction of Regulatory Boolean Networks Based on Expression Profiles Data Noise
Authors: Wang Li Qin , Chen Gui Qiang , Zhao Hong Hai
Published: November 2012

After while the “Human Genome Project” proposes, the people complete measures the foreword plan after the multi-gene genome team, also starts to change to these genes and their reciprocity function understanding research. Varieties of gene regulation Boolean networks algorithms have been proposed of the gene expression profiles, however, the problem of noise could always be found in creating a Boolean network. Due to gene expression data are always noisy. In this paper, it show that after the Boolean networks logic function are learned from noisy data, some noise in the Boolean function could be restructure Karnaugh Maps. It could find logic relationships between protein and protein and restructure protein logic networks. It find logic relationship among proteins as well as COGs (clusters of orthogous groups) and build the logic network of protein.
The Global Attractor of the 3D Complex GL Equation and the Estimate of its Dimensionality
Authors: Li Ben Tu , Yuan Zhi Chao
Published: November 2012

In three-dimensional space, by using the method of a priori estimation, we have studied the complex-valued GL equation, which has the 2 -th power of the nonlinear term. We have proved that the existence of the global attractor of this equation with the problem of period and border value, and we have studied the dimensionality of Hausdorff and fractal of the global attractor.
Predicting Urban Runoff under Different Surface Conditions in Xi’an, China with DRAINMOD
Authors: Quan Quan , Luo Wan , Shen Bing , Zhang Gao Feng , Dong Li Yuan
Published: November 2012

Increasing impermeable surface area has become a serious burden for drainage of urban stormwater. It is thus important to know how much surface runoff may be generated by storms of varying intensity and duration, especially on a continual daily basis. In this paper, the field hydrology model-DRAINMOD was used to simulate daily surface runoff under different surface condition in Xi’an, China. As a major hydrological components in DRAINMOD, daily evapotranspirations were calculated with the FAO Penman-Monteith method and read into the model. Infiltration parameters were considered as calibration factors in the modeling process. Available data from a local rainfall-runoff experiment were used for model calibration by matching the model predicted surface runoff with the measured values on an event basis. The calibrated model was then used for long term simulations in order to examine the impact of varying climatic conditions and land cover on urban runoff. The modeling results may provide a practical guidance for city storm water management.
Attitude Change on the along Track Interference Baseline and Moving Target Velocimetry in the Distributed Satellite SAR System
Authors: Huang Bo
Published: November 2012

In the distributed satellite SAR system, satellite attitude change bring on baseline error between physical baseline and effective baseline and echo phase error. If the errors aren’t corrected, it may induce velocity-measure error. In this paper, we first respectively analyze the Influence of the satellite attitude to effective baseline and velocity-measure precision, and build the corrected model of baseline. Then we also analyze the synthetical Influence of that. The simulation results show that the validity and the necessary of the corrected model of baseline, and it is presented that the correctional curves of the baseline error and the velocity-measure error.
Predicting Duct Height in Atmospheric Duct by Neural Network
Authors: Zhao Xiao Long
Published: November 2012

The experimental data show that Southeast China Sea has a higher occurrence probability of atmospheric duct. Based on modified refractivity, Neural Network was introduced to predict the duct height of evaporation duct and analyze the anomalous propagation of electromagnetic wave in marine evaporation duct. By Neural Network, Refractivity from Clutter (RFC) is used to predict and forecast the refractive index profile of evaporation duct.
Stability Performance Study on the Conversion Track Wheel Loader
Authors: Pan Xiao Chun , Yao Kai , Tian Xin Min
Published: November 2012

The wheel loader in the muddy, slippery, ice and snow, soft ground condition working that has slippage, subsidence, instability phenomenon, at the same time efficiency and loss of work capacity. Developed a kind of the conversion track wheel,It can replace the tire. Study on the conversion track wheel loader stability performance.The track wheel loader longitudinal running stability, ramp driving horizontal stability theoretical analysis, obtains the loader in slope driving max gliding angle relate the friction coefficient between the tire or track and the ground. The max tilting angle related to the loader barycenter closely. Because loader track wheel is used in rubber track, and the coefficient of friction between the tire and the ground is basically the same, so replacing track wheel loader max transverse glide angle and longitudinal glide angle essentially unchanged. Combined with the SolidWorks the conversion track wheel loader barycenter analysis position results, the conversion track wheel loader barycenter and the wheel loader compared under various working conditions are reduced, so the the conversion track wheel loader stability has improved.
Attitude Stability and Control of the System Coupled with Main Rigid Body, Elastomer and Tip Rigid Body
Authors: Xu Jian Guo , Qu Liang Hui
Published: November 2012

The dynamic model of a class of the system coupled with main rigid body, elastomer and tip rigid body is established. The control law of the system is given, and the attitude stability of the complex controlled system is studied in infinite dimensional functional spaces by means of the modern mathematics and large scale system analysis.
Investigation of the Effect of Fuel Reactivity on Dual-Fuel PCI Combustion
Authors: Ou Li Jun , Wang Chun Mei , Wang Hui Chun , Zhu Su Wei , Qian Ye Jian
Published: November 2012

The potential of controlling premixed compression ignition (PCI) combustion by two fuels with different ignitability and volatility was studied numerically by a three-dimensional computational fluid dynamics (CFD) model. The results indicate that the addition of gasoline to diesel fueled PCI engine can retard the ignition timing, lower the in-cylinder temperature, and reduce the exhaust emissions.
Motion Performance Analysis and Experiment Research of the Hooke’s Joint-Gear Mechanism of Differential Velocity Vane Pump
Authors: Hu Ming , Yuan Wei Dong , Chen Wen Hua , Chen Ming , Zhang Yao , Qian Ping
Published: November 2012

Based on the analysis of its motion performance about Hooke’s joint-gear mechanism, the Hooke’s joint-gear mechanism of differential velocity vane pump is brought forward. By analyzing its motion rule on the driving system of the differential velocity vane pump, the design parameters of the Hooke’s joint-gear mechanism of differential velocity vane pump are shown. The overall structure and its principle prototype are designed. Based on the principle prototype of the differential velocity vane pump, the experimental platform is established to testify the draining and trapping fluid. The results are shown that Hooke’s joint-gear mechanism of differential velocity vane pump can achieve the function of draining and aspirating fluid, and the design on the driving system and the pump structure are correct.
Static Behavior Analysis of a New Space Beam-String-Structure with Outer Truss Torus
Authors: Ma Guang Ying , Yao Yun Long , Zhang De Sheng
Published: November 2012

The development and engineering applications of beam-string-structure are introduced and a new space beam-string-structure with outer truss torus is proposed. The new structural system is to reduce the space occupied by roof structure and could be laid by the rigid roofing material easily. Three types of annular tensile cable-truss structure were given. Sunflower-patterned space beam-string-structure was taken as an example and its static behavior under full-span load and half-span load was analyzed. The efect of prestress level on static behavior of the structure was studied. The results will provide a reference for a further design and project application of such structure.
Study of Normal Force-Displacement Relationship in Spherical Joints
Authors: Gao Zheng Ming , Jia Jun Bo , He Sheng Ping , Wang Bin
Published: November 2012

In order to analyze the structural characteristics or calculate the support force of large-scale complex systems with spherical joints, an approximated method was raised simplifying the force of inner bodies to contact pressure with a hypothesis that the contact zones is ideally spherical. The contact pressure distribution is obtained and normal force-displacement relationship is simulated with finite element methods (FEMs). Finally, the goodness of fit is calculated with statistical hypothetical test theory treating the FEM results as the sample data.
An Experimental Investigation on Engine Exhaust Emissions of a Low Heat Rejection (Mullite Coated) Single Cylinder Diesel Engine
Authors: Shrirao Pankaj N. , Shaikh Parvezalam I. , Zafaruddin Farazuddin , Pawar A.N.
Published: November 2012

Tests were performed on a single cylinder, four stroke, direct injection, diesel engine whose piston crown, cylinder head and valves were coated with a 0.5 mm thickness of 3Al2O3.2SiO2(mullite) (Al2O3= 60%, SiO2= 40%) over a 150 µm thickness of NiCrAlY bond coat. The working conditions for the conventional engine (without coating) and LHR (mullite coated) engine were kept exactly same to ensure a comparison between the two configurations of the engine. This paper is intended to emphasis on emission characteristics of diesel engine with and without mullite coating under identical conditions. Tests were carried out at same operational constraints i.e. air-fuel ratio and engine speed conditions for both conventional engine (without coating) and LHR (mullite coated) engines. The results showed that, there was as much as29.41% and 24.35% decreasing on CO and HC emissions respectively for LHR (mullite coated) engine compared to conventional engine (without coating) at full load. The average decrease in smoke density in the LHR engine compared with the conventional engine was 13.82 % for full engine load. However, there was as much as 20% increasing on NOx emission for LHR engine compared to conventional engine at full load. Also the results revealed that, there was as much as 22% increasing on exhaust gas temperature for LHR engine compared to conventional engine at full engine load.
Study on the System Disturbance Rejection Method Used in the Gimbal Servo System of Magnetically Suspended Control Moment Gyro
Authors: Wang Zong Sheng , Fang Jian Cheng , Meng Xiu Zhi
Published: November 2012

In order to suppress the impact of the friction torque and the magnetic levitation high-speed rotor system on the stability of gimbal servo system output angular rate, a self-adaption compensation method with no modeling for disturbance torque is presented. The interference suppressor calculates the disturbance compensation based on the torque motor current and the angular rate measured real-time by the current detection circuit and the frame angular detection circuit in the gimbal servo system, then feedbacks to the frame servo system controller to regulating the torque motor output current. 500Hz and 50Hz sinusoidal disturbance torque are introduced into the system to test the role of the interference suppressor. The result proves the interference suppressor has the same significant inhibition of effect for disturbance torque of different frequencies by MATLAB simulating framework output angular rate waveform.
Fault-Tolerant Control Research of Vehicle-Mounted 5-Phase Inverters
Authors: Zhang Jing Ming , Yuan Yi Yue , Wang Hao Min
Published: November 2012

As the electricity conversion switch of electric vehicles, the inverters play an important role in vehicle’s driving and regenerative braking process. Therefore, the research in fault-tolerant control of inverters has important significance. This article applied a 5-phase fault-tolerant inverter into the electric vehicles, and researched its single-phase and double-phase fault-tolerant control. The experiment results prove that the 5-phase fault-tolerant inverter can assure the vehicles run as usual with single-phase or double-phase fault.
High Pressure Suspension Injector Electromagnetic Valve Drive Circuit IR2110 Design Application
Authors: Deng Bei Bei
Published: November 2012

This paper designs a kind of IR2110 based on high voltage suspension of driving circuit for electromagnetic valve, using the IR2110high pressure suspension characteristics, the boost circuit to meet the rapid opening stage and maintain the electromagnetic valve stages required for high voltage. The IR2110 based high voltage suspension driving circuit to realize electromagnetic valve is closed quickly, with a control signal frequency range, starting current, maintain the current size, PWM signal frequency and duty cycle can be adjusted advantages.