bluuebunny/crossref_metadata_2025 huggingface dataset:
Analysis on Seismic Behavior of Structures Supported by Foundations with Different Locations
Authors: Wang Li Ping , Zhong He Ping , Huang Lin Qing
Published: May 2013

In order to know more about the seismic behavior of structures supported by foundations with different locations, using the elastic and static elastic-plastic analysis method, the research is respectively from the aspects of the distribution characteristic of elastic inter-story displacement angle, the distribution law of story shear, and the distribution characteristic of elastic-plastic displacement angle and the sequence of plastic hinges. In the end, it is got that the characteristics of force and deformation of structures supported by foundations with different locations. It is found that the position of weak story would change along with the change of story stiffness. In order to guarantee the structures supported by foundations with different locations to have good seismic behavior, it needs to take the necessary internal force adjust measures and details of seismic design.
Energy Conservation Technology in BedZED and the Enlightenment for China
Authors: Xue Ya Wen , Meng Cong Ling
Published: May 2013

This article demonstrated the necessity of building energy-saving design in our country. Analyzed the advanced building energy conservation technology applied to the BedZED in United Kingdom, such as solar energy technology, ventilation technology and water-saving technology. In accordance with the practice in Residential area in China, the realization way of building energy conservation technology is presented, in order to achieve the aim of sustainable development.
Paying Attention to the Application of Ecological Strategy to Construction Design
Authors: Du Zheng , Zhang Yong Sheng
Published: May 2013

Construction affects ecological environment as well as mankind. It continuously influences the surroundings, user’s life and especially highly developed cities in our country. Ecological construction will become the main stream in the 21st century. Construction is closely related to the sustainable development which is composed of three important aspects, namely, environment protection, economic development and social progress. Ecological construction should be a part of sustainable development. Facing the main problems in ecological environment and construction design in China, this paper suggests that in the construction design the application of ecological strategy should be paid attention to, and that to promote the ecological construction design should rely on the enhancing of the ecological consciousness of whole society, the strengthening of the communication between man and the natural environment, and the perfecting of laws on the ecological building design.Building in the people, nature and social - economic compound ecological system, not only affects the earth's ecological system, and directly related to the survival and development of the human being. The rapid development of construction industry in our country, the neglect building, and the natural ecological environment, the coordination between the various technical equipment in use, the improvement of people's living environment, give people bring convenient and comfortable at the same time, also produced many negative effect and harm, such as the construction of environmental pollution, building materials the harmful elements, noise, "air conditioning syndrome" trapped around the people's life and health. Therefore, we must pay attention to ecological strategy application in architectural design.
Production of Concrete Blocks with Residues for Civil Construction
Authors: Camargo Marília Martinês de , Lintz Rosa Cristina Cecche , Gachet-Barbosa Luisa Andréia , Pires Marta Siviero Guilherme
Published: May 2013

The Construction is recognized as one of the most important activities for the economic and social development, and on the other hand, behaves also as a major generator of environmental impacts, either by consumption of natural resources, the modification of the landscape or the generation of construction and demolition waste (CDW). Investing in an implementation of managed clean and healthy in the area of CDW is essential for the environment and for the economy of the cities, who are spending less resources on the collection, cleaning of drains and treatment of diseases. Nowadays, the amount of waste generated is considered large, occupying much space in landfills, and its transportation, depending on the volume and weight, is quite expensive. Recycling and reuse of these wastes are extremely important to control and mitigate environmental problems, as well as produce various materials value-added. Over 90% of waste can be recycled, reused and transformed into aggregates with characteristics very similar to the original product, thus creating environmentally friendly products such as sand, gravel, pebbles. This research concerns the study of the properties of concrete containing CDW, aiming its use in the manufacture of concrete blocks to seal without structural function. Blocks have been molded with partial replacement of natural aggregates by recycled aggregates and later were performed tests of compressive strength in accordance with the standards to prove the technical feasibility of the material for the trait studied.
Temperature Distribution of Multi-Crystalline Silicon Ingots in the Directional Solidification Process
Authors: Ma Xiang Rong , Zan Wu , Zhang Xin Liang
Published: May 2013

In order to better understand the casting process, we carried out global simulations of heat transfer to investigate the temperature distributions in furnace at 80 mm of insulation cage elevation and 40% of silicon melt solidification for multi-crystalline silicon (mc-Si) ingot using an industrial directional solidification furnace capable of producing 500 kg silicon ingot. The effect of heater position and the crystallization state of silicon melt on temperature distribution and interface shape are discussed as well to provide the essential knowledge for system optimization.
Cathode Material Li [Li0.2 Mn0.44Ni0.18Co0.18]O2 Synthesized by Molten Salt Method
Authors: Fan Guang Xin , Li Hui Lian , Dai Shu Pu , Zhang Chuan Xiang , Guan Xue Mao , Chang Zhao Rong
Published: May 2013

In this paper, LiOH·H2O and Li2CO3, which were widely used in industry and (Mn0.533Co0.233Ni0.233) (OH)2prepared by ourselves selected as starting materials, series materials of lithium-rich layered material Li [Li0.2Mn0.44Ni0.18Co0.18]O2were obtained by a molten salt method. Their structures and properties of the materials were investigated by X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET) and constant current charge/discharge methods. The effects of different LiOH and Li2CO3molar ratios on the Li [Li0.2Mn0.44Ni0.18Co0.18]O2structures and properties were characterized. The results of the experiments indicate that The structures of the material such as crystal structure, the specific area, particle size distribution, tap densities were controlled by adjusting the proportion of the two lithium sources. Forthermore , when the molar ratio of LiOH and Li2CO3was 3:7, the maximum discharge capacity (214.77 mAhg-1) of the cathode was obtained.
Fabrication of Micro DMFC Stack Using MEMS Technology
Authors: Suo Chun Guang , Zhang Wen Bin , Su Shi
Published: May 2013

This paper presents two kinds of direct methanol fuel cell (μDMFC) stack in planar array. The silicon-based DMFC stack is designed in a flip-flop configuration using MEMS technology, and the stainless steel stack is fabricated using stamping technology. Compared to stainless steel stack, the flip-flop silicon-based stack may reduce the connection space and lower the contact resistance between the membrane electrode assembly and the plates. The electrical characterization of this μDMFC stack was carried out by tests. The experimental results showed the prototype was able to generate an open-circuit voltage of 2.7V and a maximum power density of 2.2mW/cm2 at room temperature, demonstrating the feasibility of this new configuration. Application of μDMFC stacks as portable power sources were demonstrated using small electric devices powered by this stack.
A Technological Method to Improve the Filtration Efficiency of Fiber Materials
Authors: Fu Wan  Jun , Liang Wei
Published: May 2013

Fiber is a new and efficient water treatment and environmental protection material. The key to improve the filtration efficiency of fiber materials is that water pass through the fiber bed, the porous structures of fiber in-depth bed is controlled by the internal construction, fiber arrangement, and fiber zigzag degree. This study presented a method to improve the removal capacity of fiber filtration materials. There are three kinds of porous structures discovered here: Tubular water passage hole (T-pass), Curvilinear water passage hole (C-pass), Labyrinth water passage hole (L-pass). The T-pass let water more easily go through but less sediment and rush strongly off suspensions deposit on the surface of filter materials. The L-pass has resistance to flow and suspension intend to deposit at backside area of filter materials, where not advantage to rush but sediment easily. The function of C-pass is between that of T-pass and L-pass. The experiment shows that C-pass filter bed is the idea structure which can be increased the efficiency of 5-10 times than others.
Kinematics Simulation for the Baler's Locking Device Based on ADAMS
Authors: Xu Ping , Cheng Ming , Liu Jun , Xie Xin Ping
Published: May 2013

By using Solid Edge, the virtual prototype of the steel stripe locking device of the baler can be set up. The kinematics analysis can be accomplished through ADAMS. According to this joint modeling method, the simulation of the parts of the power input and output are analyzed. According to this kinematics simulation analysis, the foundation for the mechanical optimized design of steel stripe locking device will be laid. By this joint virtual prototype simulation, complex virtual prototype mechanism design has a certain practical reference value.
Study on Fast and Precise Measurement of Three-Dimensional Displacement Using Hall Sensors
Authors: Sun Yu Ting , Hu Jin Chun , Zhu Yu , Chen Long Min
Published: May 2013

Based on permanent magnet (PM), lots of redundant position information can be achieved only by using few sensors. The redundant information is used for not only decoupling multi-dimensional displacement, but also reducing the measurement uncertainty. However, it is difficult to decouple the magnetic intensity and multi-dimensional displacement. On this point, this paper builds the measurement system consisting of hall sensors and a cylindrical PM. Secondly, the mathematical model of magnetic intensity and displacement is established with the help of finite element simulation. Thirdly, three-dimensional measurement algorithm is proposed based on the method of symmetry and linearization. The experiment results demonstrate the measurement system has satisfactory performance. In addition, without complex calculation, the system has the advantage of fast measurement.
The Establishment of the Fingerprint of Bangduling Oral Liquid by the High Performance Liquid Chromatography-Diode Array Detector
Authors: Wang Hong Jun , Zhou Tie Zhong , Jiang Hong , Yao Dan , Wang Tie Liang , Zhang Hua , Hou Yan Jie
Published: May 2013

Bangduling (BDL) oral liquid, which is a new research and development herbal preparation, comprises four traditional Chinese medicines (TCM): Radix Scutellariae, Cortex Phellodendri Chinensis, Folium Isatidis, and Radix et Rhizoma Rhei. A simple, reliable and reproducible method, based on a high performance liquid chromatography-diode array detector (HPLC-DAD) method, for establishing fingerprint of complex herbal medicine BDL oral liquid was described firstly. In order to develop and validate this HPLC-DAD method, Kromasil C18 column (S-5μm, 4.6 mm × 250 mm) was used with gradient mobile phase at the column temperature of 30°C. The mobile phase was consisted of methanol and water containing 0.1% phosphoric acid. UV wavelength was set at 254 nm. Ten batches of BDL preparations were used to establish the HPLC fingerprint. In addition, the contents of baicalin in the preparations were also determined. Validation of the analytic method was evaluated by stability, precision and repeatability test. Calibration curve for baicalin showed good linearity with R2 = 0.9992. The relative standard deviations (RSDs) value of the relative retention time and peak area in the stability, precision and repeatability test, were less than 1% and 5%, respectively. The similarity of 10 batches of BDL oral liquid was more than 0.958, which showed the preparations from different batch productions were consistent. This established determination method could be efficient to the quality control of BDL oral liquid.
Study on early Warning System of Coal and Gas Outburst
Authors: Liu Xiang Lan , Zhao Xu Sheng , Dong Gui Gang
Published: May 2013

Coal and gas outburst is an extremely complex and serious gas dynamic phenomenon. Therefore, building an early warning system based on computer system, safety monitoring systems of coal mines and local area network is a precondition for effectively preventing coal and gas outburst. Combining the hardware conditions, organization management structures and characteristics of preventing outburst technology systems, this paper discusses the principle, logic structure and implementation process of gas outburst warning, devises the software and hardware structure of the warning system and therefore offers theoretical thought and methods for the forecasting of coal and gas outburst.
Gear Fault Diagnosis Method Using EEMD Sample Entropy and Grey Incidence
Authors: Zhang Wen Bin , Pu Ya Song , Zhu Jia Xing , Su Yan Ping
Published: May 2013

In this paper, a novel fault diagnosis method for gear was approached based on morphological filter, ensemble empirical mode decomposition (EEMD), sample entropy and grey incidence. Firstly, in order to eliminate the influence of noises, the line structure element was selected for morphological filter to denoise the original signal. Secondly, denoised vibration signals were decomposed into a finite number of stationary intrinsic mode functions (IMF) and some containing the most dominant fault information were calculated the sample entropy. Finally, these sample entropies could serve as the feature vectors, the grey incidence of different gear vibration signals was calculated to identify the fault pattern and condition. Practical results show that this method can be used in gear fault diagnosis effectively.
Study of Double-Sided Welding Defect Detection Technique Based on the Method of Magnetic Flux Leakage
Authors: Dai Guan Ga , Cui Wei , Wang Xue Zeng
Published: May 2013

This paper presents a new approach based on the method of magnetic flux leakage (MFL) for the double-sided butt weld (DSBW) of the welding equipment such as the pressure vessel in order to detect and identify the weld defect. In this approach, a new magnetization structure is adopted whose magnetization direction is perpendicular to weld line, also, a new continuous non-contact scanning method is used, what aims to solve the problems about complex leakage magnetic field (LMF) space distribution. Then, the LMF distribution laws with non-defect (ND) and laws with precrack from heat affected zone (PFHAZ) are obtained through using these methods such as theoretical analysis, numerical simulation, and experimental study. Afterwards, this paper reviews the recognition analysis of the above-mentioned two kinds of state (ND and PFHAZ) by binding the contrastive curves. The outcomes indicate that the suggested method of MFL has realized the recognition of ND and PFHAZ; The numerical simulation results and experimental results match each other well and their correlation coefficient R is 0.9729. Furthermore, the results verify the feasibility and the validity for the suggested method. This is a new way for exploration detection of the double-sided butt weld.
The 3D Magnetic Field Analysis of Excitation Unit of Drill Pipe MFL Testing Based on ANSYS
Authors: Ma Yi Lai , Lin Li , Jiang Kai Wen , Zhao Xu Lin
Published: May 2013

Magnetic flux leakage is one type of electromagnetic nondestructive testing (NDT) which is widely utilized in the testing the integrity of drill pipe in the field. In this paper, the 3D model of excitation unit is completely built and analyzed by ANSYS software. The magnetic field of drill pipe in the combination of full excitation device is showed by ANSYS software instead of the physic experiments which increases the efficiency tremendously and decreases the cost and achieves the anticipated desire. It is considered that this technique can provide the theoretical basis of drill pipe excitation device and the magnetic flux leakage testing of drill pipe.
Development of an In Situ Analyzer for Iron in Deep Sea Environment
Authors: Jin Bo , Chen Zhi Wei , Zhu Shi Qiang
Published: May 2013

This study presents the development of an in-situ analyzer, ‘IonConExplorer’, which can detect iron concentration in deep seawater at maximum 4000 meters with the method of spectrophotometry coupling with liquid waveguide capillary cell. The detection of limit is 27.25nM (n=20) for Fe(II) at 562nm, while the linear range is 100 nM - 1 μM. On the whole linear range, relative standard deviation of the seven replicate measurements is less than 2%. IonConExplorer is composed of pressure house and equipressure house containing control unit and fluid system, respectively. Via TCP protocol of network communication protocol(TCP/IP) when connecting to the ocean observing network, IonConExplorer transfers abundant real time data instantly to the shore-based station, demonstrating high temporal and spatial distribution resolution of iron.
Automatic Monitoring System for Forest Fire Based on Wireless Sensor Network
Authors: Zhu Bi Hua , Zhu Da Qing
Published: May 2013

The forest is considered as a precious and indispensable nature resource, but forest fire which can destroy forest resource safety and threaten human-living environment is considered as one of the severest disasters. How to monitor and collect information of forest fire at any time, it is a difficult problem for Forest Fire Prevention Departments to urgently solve. With the development of sensor technology, MEMS and wireless communications, wireless sensor network (WSN) has wide application in all kinds of fields. In order to prevent forest fire occurrence, this paper designs a monitoring system for forest fires based on wireless sensor network and GPRS network. The system gives the hardware design of wireless sensor nodes and software implementations, and chooses CC2530 to achieve the process of data acquisition and transmission, then sends the data through GPRS module to the remote monitoring center. By means of WSN and GPRS network, the system accomplishes data acquisition and long distance transmission.
The Design and Realization of CNC System Test Board Based on STM32
Authors: Wang Xian , Wang Zhe , Wang Tai Yong , Lin Fu Xun , Ge Yin Ming
Published: May 2013

According to the complicated operation,time-consuming limitations of traditional CNC system test equipment,a test board with STM32 as the central controller is designed.The board has RS232 serial communication function,together with input and output channels of CNC system interface signals.Firstly, this paper introduces the whole structure and hardware interface circuit of the test board. Secondly,in the MDK programming platform,the test programs of data receiving, processing, control and communication are designed. Finally,the system test is accomplished through the joint debugging of the software and hardware system. The test board has been proved to have good stability and scalability,and successfully applied to the practical production.
Design and Implementation of the Environment Monitoring System Indoor Based on RFD5800
Authors: Wang Chang Tao , Kan Feng Long , Zhao Lan Guang
Published: May 2013

As the characteristic of the indoor, Environment monitoring system is not suitable for wiring, It be designed an indoor environment detection system based on RFD5800 which is wireless transmission module in this paper, and completed the hardware and software design of the system. The hardware system consists of the main control module, the detection module, display module, wireless transmission module and control module. Software includes acquisition program and transfer procedures, and application of fuzzy control algorithm for data integration to improve the measurement accuracy. The system achieved the purpose of real-time monitoring of the indoor environment by detecting
Photogrammetry Technology of Three Dimensional Coordinate in the Construction of Curved Surface
Authors: Chen Jian Min , Gao Ping Mei , Hao Xiao Dong , Lu Chun Yv
Published: May 2013

To solve the problem that the workload of measuring complex and large components of platforms is large during offshore platforms constructing, this paper puts forward 3d photogrammetry. With the help of the matlab calibration software tooibox_calib, we calibrate the intrinsic and extrinsic parameters of camera. Then through the measurement of intersected binocular vision, we reconstruct the 3d model of the curved surface.
Research on Three-Position and Parallel System of Inspecting the Automotive Piston Rings
Authors: Zhao Na , Wang Zhong , Lan Tai Ji
Published: May 2013

The paper proposes an efficient system to inspect the automotive piston rings. The width of end gap and the degree of light leakage are two significant parameters of the piston ring that must be controlled in a certain range. Due to the small size of automotive piston rings and the large quantity, the paper uses the vision system and image processing tools to detect the piston rings with 80.5mm diameter. The uncertainty of inspecting end gap and light leakage can reach 0.01mm and 2° respectively. In order to improve the inspection efficiency, the paper uses three-position and parallel system, end gap and light leakage are inspected at the same time, it can detect 10 pieces/min.
GSM Modem and Industrial Camera Aided Unattended Automatic Fatigue Testing Technology
Authors: Liu Jia Jun , Sun Zhen Guo , Zhang Wei Ming , Chen Qiang , Xu Ji Min
Published: May 2013

In order to reduce the time and labor cost, an unattended testing system which can be monitored remotely for fatigue crack growth threshold test was developed. Compliance technique is used to measure fatigue crack length automatically. GSM modem and industrial camera are utilized to realize remote monitoring. Fatigue crack growth threshold test on J2 steel, which is used on the wheel of high-power locomotive, has been carried out with the developed system. The testing process and results demonstrated the safety and efficiency of the system.
A Nonlinear Heuristic-Optimized Neural Network Modeling Approach for the Prediction of Natural Disasters
Authors: Wan Yu Qiong , Liang Jun You
Published: May 2013

The disaster early-warning and corresponding prediction based on the nonlinear models is one of the important research aspects in the scope of natural disaster prediction and prevention. In this paper, the principle of applying heuristic algorithms to modify the classical neural networks so that some improved models with more efficiency can be achieved is proposed. The detailed structure and implementation of such model is also provided by building a heuristic-optimized neural network (HNN) model. Some regional flood data of China is then applied to conduct the prediction with the proposed model. Simulation results demonstrate that the proposed model can achieve higher accuracy and find an appropriate trade-off between the cost of processing time and precision, compared to the normal nonlinear models.
Radar Emitter Signal Feature Extraction Based on Time-Frequency Atom Decomposition
Authors: Li Jun Gang , Chen Zhu Yu , Yang Ji
Published: May 2013

In this paper, a novel approach based on time-frequency atom decomposition is presented to recognize the radar emitter signals. To decompose the signals into a linear expansion of time-frequency atoms, a fast matching pursuit (MP) algorithm, which is optimized by composite differential evolution (CoDE) algorithm, is introduced. The feature vectors of radar emitter signals are extracted based on the atoms generated in the process of decomposition. The Directed Acyclic Graph SVM (DAGSVM) is selected as the classifier to classify the feature vectors of different radar emitter signals.
Monitoring and Diagnostics Systems Application at 35-110 kV Substations
Authors: Khalyasmaa Alexandra I. , Dmitriev Stepan A. , Kokin Sergey E.
Published: May 2013

The present paper is devoted to the issue of the monitoring and technical diagnostics systems of 35-110 kV substations equipment. The primary task of this paper is to prove the possibility of using the system analysis data of technical diagnostics equipments for the integral estimation of substation equipment in cases there is no possibility to establish a monitoring system for technical, economic or other reasons. As an example, an analysis of state of electrical equipment and the technical diagnostics data of real large load center are performed. In this paper the main data analysis methods of technical diagnostics are presented.
Safe Test System for the Turning Vehicles ESP Control Performances on the Lateral Restricted Vehicle System
Authors: Zhao Jian Zhu , Zhang Lu , Wang Guo Ye , Chen Yan , Zhang Zhong Fu
Published: May 2013

Project the lateral restricted vehicle system to establish a safe and efficient vehicle driving stability control test system. Aimed at Chery A3 car, based on Matlab/Simulink, establish the lateral restricted vehicle dynamic simulation system. Used the braking and driving integrated ESP control strategy, separately analyze the ESP control performances of the independent vehicle system and the lateral restricted vehicle system on three test conditions including neutral steering, under steering, over steering. The research results indicate that the ESP control performances of the lateral restricted vehicle system and the independent vehicle system have great uniformity on the three test conditions, provide a basis for the vehicle driving stability control test research.
Study on the Application of FPGA in Magnetic Flux Leakage Acquisition System
Authors: Chai Ming Gang , Hai Xia , Gong Xun Wu
Published: May 2013

Embedded CPU in traditional magnetic flux leakage detection system was used as the master controller. CPU is serial processor, which making it difficult to collect the large amounts of real-time data. While FPGA has the advantages of high integration, high speed processing, parallel processing. FPGA is applied to magnetic flux leakage acquisition system to solve data acquisition problem. It comes up with the designs of a multi-channel magnetic flux leakage signal selection control module, A/D conversion module and communication module in VHDL language on QuartusII. The experimental results show that each module of the magnetic flux leakage acquisition system based on FPGA can meet the requirements, and can correctly collect magnetic flux leakage signal, convert and transmit data. Design of FPGA-based is programmable in the field, magnetic flux leakage collection system can be flexibly designed for different occasions, and has independent intellectual property rights.
Modeling Dynamic Laser Speckle Patterns of Plant Leaves
Authors: Zhong Xu , Wang Xue Zhi , Farrell Peter , Cooley Nicola , Moran Bill
Published: May 2013

t is known that dynamic speckle patterns can be used to identify the temporal evolution of an active sample and some desired properties of the sample may therefore be detected via the dynamic laser speckle analysis. Mathematically understand the structure of sample surface which gives arise to the dynamic speckle patterns is crucial to the analysis. In this paper, a simulation model of the dynamic speckle patterns for plant leaves is proposed. The developed model is derived from the principle of coherent electromagnetic wave scattering off a randomly textured and time varying surface and is demonstrated via the simulation of dynamic speckle patterns of a fresh unattached leaf surface along the true laser speckle measurements. Both simulated and true measurements of the dynamic speckle patterns of the leaf are analyzed via several statistical techniques and a consistent agreement between the results of the two is observed. The proposed statistical model is helpful to gain the insight of the relationship between speckle dynamics and the activity of the leaf surface which is supposed to be an measurement of plant water stress and water status.
Optimization Design of Sugarcane Planter’s Frame Based on ANSYS Workbench and UG
Authors: Li Jing , Pu Ming Hui , Lu Yu Hai , Li Zhao Long , Xu Lei , Li Ming
Published: May 2013

The parameterized model of one type of Sugarcane Planter’s frame was created in UG, then it was imported into ANSYS Workbench by Proprietary program interface. The frame was static analyzed in two kinds of working condition, and the Strength and stiffness was checked according to the calculation results. Finally, the frame was optimized by Design Exploration module in ANSYS Workbench.
40-GHz Pulse Generation Based on Two Cascaded Electro-Absorption Modulators Driven by 20GHz-Sine-Wave Signal
Authors: Hu Cheng , Zheng Qi , Xiong Xiao Yong
Published: May 2013

A 40-GHz optical pulse train is generated by using of one optical delay line and two cascaded electro-absorption modulators driven by 20GHz-sine-wave signal at very low bias voltage (-0.8V) in conjunction with a tunable distributed feedback (DFB) semiconductor laser. An approximate transform-limited optical pulse, with pulse duration of width less than 7ps, the spectral width of 0.3nm and the side-mode suppression ratio (SMSR) of about 17dB was obtained in experiment. Keywords: OTDM, EAMs, optical pulse, less cost.
An Efficient Detail-Preserving Random-Valued Impulse Noise Filter
Authors: Hu Ji Bao
Published: May 2013

This paper presents an efficient detail-preserving random-valued impulse noise filter. The proposed method introduced an image statistic, the decision-based rank ordered absolute differences (DROAD for short), to distinguish image details from impulses. This reduces the probability of detecting image details as impulses. Besides, in order to search for suitable thresholds at noise detecting phase, we present the Q-estimate of variance in noisy image. According to image variance, we define a threshold for each pixel. This makes more impulses can be identified. Experiments results show that our filter provides a significant improvement over many other existing techniques.
Optimization of the Hinge Point Position of Luffing Mechanism in Reach Stacker for Container
Authors: Tian Ming Hua , Hu Shi Cheng
Published: May 2013

The luffing mechanism of reach stacker is the core of big arm lifting mechanism. The hinge point position in it influences directly the comprehensive performances. The mathematical model of three hinge points was established through the force analysis of luffing mechanism, which aims to reduce the maximum force of hydro-cylinder and decrease the oil pressure of hydraulic system. A hierarchical ordering method was utilized to optimize the multi-objective problem. The optimization calculation was presented by using the genetic algorithm in Matlab. Experimental results indicate that the optimization enhance the comprehensive performance of reach stacker. And this also provides important foundation to the parameters design of luffing mechanism.
The Design and Construction of Planar Array Modulation Collimator
Authors: Lin Lin , Zhang Huai Ling
Published: May 2013

A design of planar array modulation collimator is proposed for intensity-modulated radiotherapy. Target area is constructed by planar array of rectangle modules which support flexible adjustment. The structure and operation principle of collimator has been introduced in detail. Combination of this equipment with standard modern linear accelerators and MLC will be an ideal method to improve boundary conformity, reduce penumbra and dose leakage.
Application Boundary Element Approach to Compute the Electric Field Intensity of the Oblique Four-Needle Electrodes
Authors: Zang Ming Chang , Wang An Ling , Liu Fu Ping
Published: May 2013

According to the electric field intensity of oblique four-needle electrodes (OFNE) in biological tissue, the discrete equations based on the indetermination linear current density were established by the boundary element integral equations (BEIE). The non-uniform distribution of the current flowing from four-needle electrodes to conductive biological tissues was imaged by solving a set of linear equations. Then, the electric field intensity generated by OFNE in biological tissues at any point can be determined through the boundary element method (BEM). It means that this method has an important referenced significance for computing the electric field intensity generated by OFNE in bio-tissue.
The Run-Time Configuration of Operating Parameters for Improved Performances of a Laser Annealing System
Authors: Li Dai , Yan Li Ren , Zhou Wei , Zhang Wei , Wang Quan
Published: May 2013

A laser annealing system for the CMOS IC processing is setup, consisting of a solid-state laser, a beam delivery system, a 2D movable wafer stage, an auxiliary heating system, and a chamber that holds all the above modules. The complexity of the system makes it much difficult to achieve a stable performance. Each related process factor is deliberated, and the strategies controlling of theses process parameters are then determined. A reconciling control method to balance the effect of laser energy density and laser beam shape is considered to maximize total production and reliability. A piece of Matlab code is programmed to assess the controlling effect. We found from running the system that after combining these strategies, system stability is improved, and desirable laser annealing process effects can be promised.
Source-End Layout Influences on MOSFET ESD Protection Devices in a 0.35um 5V Process
Authors: Chen Shen Li , Lee Min Hua , Wu Tzung Shian
Published: May 2013

An nMOS transistor in input/output pad as the ESD protection element is usually in the form of multi-finger layout. This paper will show simple but effective ways to improve an nMOSFET’s ESD robustness or LU immunity for use in I/O pads, i.e., the source-end layout influences on the protection components in ESD/LU capabilities of the input/output pads will be investigated. In other words, they are used to increase the effective ESD or LU capability of the ESD protection elements. Here, the different source-end layout types will be carried out the important snapback parameters. We focus on exploring the secondary breakdown current (It2) and holding voltage (Vh) for the ESD discharge capability and the latch-up immunity, hopefully, it does effectively enhance ESD/LU robustness.
Research on Practical Control Circuit of SVG in Single-Phase Low Voltage Field
Authors: Zha Cong Mei , Dong Yan
Published: May 2013

For the use of Static Var Generator (SVG) in dynamic reactive power compensation of low voltage field, this paper proposes a reactive current control strategy suitable for single-phase bridge voltage source SVG and gives the main control circuit of this control method. The experimental results verify the effectiveness and practicality of this control strategy and the circuit design.
The Research of Closed Loop Control of AC Motor Based on J-M Transformation Control
Authors: Shen Jun Min , Zhu Gui Ying
Published: May 2013

There are two classic strategy for AC motor control, they are vector control and direct torque control. In this paper, a new closed-loop control method based on vector control is proposed. We first introduce the basic formula of the J-M transform strategy. Secondly, the control block diagram of closed loop control based on J-M transform is analyzed in detail. Finally, the results of simulation are carried out. The simulation results show that the method of closed loop control based on J-M transform strategy can control AC motor effectively.
Research Based on the Simulink Excavator Hydraulic System Dynamic Simulation
Authors: Du Qiao Lian , Chen Xu Hui , Chen Wei Zheng
Published: May 2013

This paper first to the excavator bucket rod of hydraulic circuit based on the establishment of basic hydraulic components of the mathematical model, using the Simulink simulation software to build the overall hydraulic circuit simulation model; according to the actual situation of module parameters to the appropriate value, the complex and changeable load is simplified into four different operating conditions, by inputting different signals to simulate different operating condition simulation, finally through the study of the parameters on the dynamic characteristics of hydraulic system of excavator working device effects, the results of the simulation analysis, put forward the corresponding improvement measure.
The Calculation of Winding Inductance in Slotless Permanent Magnet Brushless DC Motor
Authors: Wang Xing Hua , Li Ming Hui , Zhang Xin Yi , Chen Yu , Zhang Cheng Hui
Published: May 2013

The winding inductance is an important parameter to analyze the characters of the slotless PM motor. In this paper an analytical energy method is introduced. By the method, the conductor inductance in the slotless motor can be figured out. Furthermore, an analysis method of the end winding inductance is presented in this paper. The calculation results are identical with the results of FEM and the actual measured value. It proves the calculation method of winding inductance in slotless motor is valid.
Hysteresis Compensation Control Strategy for Pneumatic ABS System of Commercial Vehicle and HIL Test Validation
Authors: Han Jong Chol , Zong Chang Fu , Zheng Hong Yu
Published: May 2013

A control strategy for pneumatic ABS(Anti-lock Braking System) of commercial vehicle has been developed and validated by combining with Trucksim simulation software and by using hardware-in-the-loop test bench for hysteresis characteristics compensation. The test results show that the ABS control strategy satisfies the control requirements for system hysteresis characteristics, and improve the performance of pneumatic ABS system for commercial vehicle effectively, thus vehicle active safety is increased.
Design of New MEA Structure for Mciro Direct Methanol Fuel Cell
Authors: Zhang Wen Bin , Wang Da Da
Published: May 2013

A novel double-catalyst layer MEA using CCM-GDE (Catalyst Coated Membrane,CCM;Gas Diffusion Electrode,GDE) fabrication method is provided. The double-catalyst layer is formed with an inner catalyst layer (in anode side: PtRu black as catalyst, in cathode side: Pt black as catalyst) and an outer catalyst layer (in anode side: PtRu/C as catalyst, in cathode side: Pt/C as catalyst). By study of the catalyst loading in the double-catalyst layer, an optimization of the catalyst layer structure is obtained, that is the cell may perform best when the ratio of the inner catalyst and outer catalyst is 1:1 (both in inner and outer catalyst layer, the catalyst loading is 1.5mg/cm2). As the hydrophilicity and pore structure are important to the MEA performance, they are optimized by adding pore former and Nafion in the GDL and outer catalyst layer, respectively. Thus three gradients from the PEM to the GDL are formed in the novel MEA: catalyst concentration gradient, porosity gradient and hydrophilicity gradient. These gradients may increase the mass transfer and quicken the electrochemistry reaction in MEA. The CCM-GDE technology may enhance the contact properties between the catalyst and PEM, and increase the electrode reaction areas, resulted in increasing the performance of the μDMFC.
Study on Motion Simulation of HOV
Authors: Liu Feng , Han Duan Feng
Published: May 2013

It will be to bear several forces when Human Occupied Vehicle (HOV) moves underwater, So the movement performance forecast and research becomes more difficult when HOV under environment disturbances,this paper regards a certain HOV as the research object,researches the HOV actual situation, the comprehensive consideration of the hydrodynamic force, gravity, propeller thrust, environmental interference force for HOV motor effects, establishes the six degrees of freedom equations of motion for HOV, several typical motion states are studied , finally the simulation work is carried out, the simulation results can reflect the HOV motion characteristics , provide important basis for HOV motion control system design.
Structure and Hydrodynamics Optimizations of Landing Autonomous Underwater Vehicle
Authors: Zhang Hong Wei , Hao Liang
Published: May 2013

Autonomous underwater vehicle (AUV) has become effective equipment in exploring and researching oceanic resources. Due to the limitation of the loading capacity of energy, the working ability of AUV is restricted. In this paper, we optimized the structure and hydrodynamics of the landing AUV II to improve the endurance. By decreasing diameter and increasing length, the resistance of the vehicle can be decreased with the same displacement. Although this may sacrifice the maneuverability, the vehicle is verified to have approving attitude controllability. In order to reduce landing impact, the AUV is conducted to dive to the predetermined depth close to seabed via controlling the attitude and then open water intake valves to get weight and land on sea bottom. Moreover, with the establishment of the dynamic model, the maneuverability and dynamic stability is analyzed and the equilibrium rudder angle is calculated. Sea trial indicates that the AUV could fulfill bottom-sitting and depth-setting exploration successfully.
A Collision-Free Trajectory Planning Method for Redundant Manipulator Spraying for Inner Surface of Pipe
Authors: Miao Dong Jing , Wu Liao , Chen Ken , Wang Guo Lei
Published: May 2013

Obstacle avoidance is an important content in the research of redundant manipulator. To automate spraying forinnersurface in a complex curved pipe, its a challenge to plan collision-free trajectory for the manipulator. A hybrid planning algorithm based on genetic algorithm and pseudo-inverse method is presented in this paper. Firstly, the collision problem between the manipulator and curved pipe is simplified to collision detection problem between polyhedron. The manipulator joints are represented by bounding volumes, and the curved pipe is deemed to polyhedron. Secondly, in the hybrid genetic algorithm, the initial population is obtained by using the pseudo-inverse method, by establishing the distance relationship between the vertices of the bounding volume and its cross-sectional plane polygon. The fitness function is constructed to evaluate the collision situation between the manipulator and pipe. Via the continuous evolution of the population, the collision-free trajectory is obtained finally.
Research on PID Linear Motion Control Strategy of Self-Balanced Two-Wheeled Vehicle
Authors: Li Ying , Wang Da Zheng , Zhang Xiao Hua , Bian Peng Bo
Published: May 2013

Abstract. The self-balanced two-wheeled vehicle is a special kind of mobile robot, this typical under-actuated system is multivariable, nonlinear, strong coupling and parameter-uncertain; the structure characteristics is its small size, simple structure, less energy consumption, flexible movement. This paper selects Lagrange equation as dynamics modeling method for this tricyclic system, and determines the dual closed-loop PID as control scheme, finally completes the study of its linear motion control. By discussing the robustness, transient performance, steady-state performance of the system, this paper uses classical control theory to complete the dual closed-loop PID controller design and simulation with MATLAB / Simulink.
Master-Slave Teleoperation Method of Redundant Manipulator
Authors: Chen Yang , Chen Peng
Published: May 2013

This paper introduces a master-slave control method of teleoperating a redundant manipulator with double handles. The master handles send motion commands in the form of increments. The mapping module transforms the commands into homogeneous matrices. And the slave manipulator links discrete motion commands in the mode of PVAT automatically, by inverse kinematics and fifth-order polynomial interpolation. Simulations and experiments are taken to prove the effectiveness of the control method in the paper.
Research on Suspended Fire Fighting Robot Prototype
Authors: Li Lu , Shi Qiang , Jiang Hua
Published: May 2013

A suspended fire fighting robot was presented, and the prototype was developed. The robot changed its posture by the blowing forces from the fans; the PID algorithm was analyzed and applied to control the rotating speeds of the fans in order to realize posture adjustment. A high speed propeller driven by an engine pushed the robot approach to the target; the relation between steering angle and thrust force was studied; a sliding table structure was developed to make the robot move steadily by changing the gravity position; the control algorithm of the propulsion system was analyzed.
Bending Analysis of Cantilever Micro-Beams Based on Strain Gradient Elasticity Theory
Authors: Kong Sheng Li
Published: May 2013

The bending deformation problem of cantilever micro-beams is solved analytically on the basis of strain gradient elasticity theory. The governing equations and boundary conditions are obtained by using Hamiltons principle. The size effect on deflections of the cantilever micro-beams is analyzed. It is found that the deflections of the cantilever micro-beams predicted by the newly model are size-dependent. The difference between the natural frequencies predicted by the newly established model and classical beam model is assessed.
The Kinematic Parameters Optimization for a New Type 3-DOF Parallel Manipulator
Authors: Zhang Jian Jun , Wang Xiao Hui , Li Wei Min , Zhang Shun Xin , Fan Shun Cheng
Published: May 2013

Parallel manipulators have the advantages of high stiffness and fine precision but the shortage of low workspace. A new type 3-DOF parallel manipulator with limbs of embedding structures is proposed. The peculiar topological structures make the mobile platform rotate continuously. The kinematics of the parallel manipulator is developed. Two kinematic parameters are decided to be optimized. The evaluation indexes about Jacobian’s conditional number are deduced and the optimization model with constraint conditions is constructed. With the optimized kinematic parameters, a graph denotes the Jacobian’s conditional number distributed in the workspace.
Mechanism Design and Analysis of a Foot Massage Robot
Authors: Xiao Shi Yu , Wang Hong Guang , Ma Dong Hua , Jiang Yong , Chang Yong , Cong Pei Tian
Published: May 2013

Combining the traditional Chinese-medicine theory and the modern robot technology, a new type of massage robot that can accurately locate the acupuncture points and implement the acupuncture point-matching treaatment has been proposed. A serial-parallel mechanism is adopted as the main mechanism of the massage robot that has the merits of not only compact structure and dexterous movement, but also realization of the motion decoupling from the force control of the massage mechanism. Based on the introduction of the foot massage robot system and its function, both the analysis of the mechanism and the optimal design have been completed to meet the design requirements. The kinematics model has been established. The simulation and experimental research have been carried out and verified the rationality of the design and the feasibility of the scheme.
The Both Eyes Stereo-Identity System in the Bomb-Disposed Robot
Authors: Fu Wei , Ou Yang Zhen Guo
Published: May 2013

This paper sets out to given a geometric method for solving three-arm five degrees of freedom manipulator kinematics inverse problem. With the both eyes stereo-identity system, the bomb-disposed robot accomplished the Explosive Ordnance Disposal mission in a completely open environment. using image recognition technology, estimation about producing weight and clamping width in the image of the suspicious explosive object is obtained. The project is proved feasible by experiment.