bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on the Ultimate Bearing Capacity of Soil about Push-Extend Multi-Under-Reamed Pile at the Compression
Authors: Qian Yong Mei , Xie Xue Wen , Wang Ruo Zhu
Published: July 2013

Due to setting of the bearing push-extend reamed of the Push-extend Multi-under-reamed Pile, the stress of soil that the upper and bottom of the bearing push-extend reamed changes at the state of compression. So there are unreasonable parts in the present formula of ultimate bearing capacity of the single pile. The ultimate bearing capacity of the soil around the Push-extend Multi-under-reamed Pile is decided, in the article, according to the failure principle of soil and the theory of sliding line, at the same time, to combine the theory of plasticity potential energy with the principle of imaginary. So the calculating model of calculating end resistance and side friction resistance of pile is corrected and perfected and the up-to-date formula of ultimate bearing capacity of the single pile is put forward at the compression.
Change Rule of Blasting Vibration Peak Velocity in Brick-Concrete Building
Authors: Wang Hai Liang , Xue Xian Bin , Zhang Zhen Huang , Wang Jun Tao
Published: July 2013

In this paper, the background is Qingdao Cross-harbor Tunnel Guide Line Project. The research on blasting vibration peak velocity was carried out by monitoring a 6-layer brick-concrete building. According the research, we discover that vibration peak velocity in the vertical direction reaches a maximum on the roof of the building. In the horizontal radial and tangential horizontal direction, the maximum appears at the 1st or 2nd floor. Third, within certain distance from blasting center, the value of horizontal vibration peak velocity is larger than vertical vibration peak velocity.
Vibration Test and Analysis for Indoor Steel Stair in Public Region
Authors: Ma Ying Qian , Gong Chang Qing , Ren Xiao Song
Published: July 2013

ndoor steel stairs, which are usually designed by professional construction companies, are controlled by the stiffness and strength. However the vibration problem is not considered and may lead to the problem of comfortability and even safety. This paper focuses on vibration of steel stairs by a case study. Both the vertical and the lateral vibration are concerned in the study by site test and numerical analysis. Based on the test and analytical results, the vibration evaluation is done for it. Finally some suggestions for indoor steel stair are given to reduce the problem of vibration.
Study on Thermal Decomposition of AP/HTPB Base Bleed Propellant after Depressurization and Flameout Conditions
Authors: Shen Hui , Yu Yong Gang , Xue Xiao Chun
Published: July 2013

In order to analyze the characteristics of secondary ignition of AP/HTPB base bleed propellant, the quenched samples of AP/HTPB base bleed propellant are made under the condition of transient depressurization, and experiments on thermal decomposition of this micro sample are carried by means of differential scanning calorimeter (DSC). The experimental results are obtained under two heating rates of 20°C/min and 40°C/min. They are analyzed and compared with the original sample of AP/HTPB. The kinetic parameters are estimated according to thermal decomposition rate equation and thermograms.
The Development of Intrusion Detection System Based on Improved BP Neural Network
Authors: Yuan Jin Song , Wang Yi
Published: July 2013

BP neural network is a multilayer feed-forward neural network, it achieved from input to output arbitrary nonlinear mapping, and weights are adjusted by using the back propagation learning algorithm. Intrusion detection systems using the learning ability of neural network to extract the network data profile, and it also can use the neural network has the ability of self-learning and parallel processing ability, through the construction of intelligent neural network classifier to identify abnormal, so as to achieve the purpose of detecting intrusion behavior. The paper proposes the development of intrusion detection system based on improved BP neural network. Experimental results show that the proposed algorithm has high efficiency.
Cross Layer Optimization for Lifetime Maximization in Wireless Sensor Network Based on Particle Swarm Optimization
Authors: Liao Chuan Zhu , Jiang Ming Yan , Shang Kun Kun
Published: July 2013

Network lifetime is a critical metric in the design of energy-constrained wireless sensor networks. In this paper, we consider the joint cross layer optimization of the physical layer, medium access control layer and routing layer to maximize network lifetime of a multi-sources and single-sink wireless sensor network with energy constraints. We focus on synchronous small-scale sensor network with interference-free link scheduling and practical MPSK link transmission scheme. As the network lifetime maximization problem is a constrained non-convex optimization problem that is difficult to be solved, and the particle swarm optimization algorithm is a good intelligent algorithm, we employ it to solve the problem mentioned above effectively in this paper. The penalty function technique is brought in to work out the constrained optimization problem by converting it to an unconstrained optimization problem. Simulation results show the effectiveness of the proposed algorithm in energy saving and network lifetime maximization, and the particle swarm optimization can solve the network lifetime maximization problem fast and efficiently.
Wavefront Sensing by Digital Holography in Optical Sparse Aperture Imaging System
Authors: Zhou Zhi Wei , Wang Da Yong
Published: July 2013

The optical sparse aperture imaging system consists of several small apertures for high resolution imaging. The incoherent light from each small aperture will form an image together strictly at the same focal plane, while the phase error will destroy such co-phase condition. The phase error is caused by deployment of small aperture and should be diminished. We applied digital holography technology to detect the wavefront of this system. The theoretical analysis and experiment are presented to demonstrate successful reconstruction of phase error.
An Improved BP Algorithm and its Application
Authors: Peng Ju Ping , Li Yue Guang
Published: July 2013

Aiming at BP algorithm convergence slow and be prone to plunge a partial basis, an improved BP algorithm------ACBP Algorithm is proposed in this paper, it has better diversity and global search capacity. The ability of optimization for the algorithm is tested through numerical computation, the experimental demonstrates that the improved BP algorithm has better diversity and global search capacity than genetic algorithm, BP algorithm, ant colony algorithm and simulated anneal algorithm.
A Study of Cavitation Bubble Temperatures in Room Temperature Ionic Liqiud
Authors: Yang Yue Tao , Gao Bin , Liu Xiao Jun , Zhang Shu Yi
Published: July 2013

Room temperature ionic liquids (RTIL) have been developed to a central point of interest in both academia and industry. RTIL is non-volatile, thermally stable and non-flammable solvent. These properties can offer a green opportunity for sonochemical reactions. In this work, the cavitation bubble temperatures have been measured using methyl radical recombination (MRR) method. The temperatures measured in ImPF6 are in the range of 3000 4000 K. Additionally, based on the bubble dynamic equation with the consideration of liquid surface tension, viscosity and radiative resistance, numerical simulations have been carried out to investigate the cavitation bubble dynamics. The difference of the temperatures obtained from the experiment and numerical simulations has been interpreted.
Insulator Image Denoising Based on the Simplified PCNN Model
Authors: Li Dan , He Hong Ying , Cao Yi Jia , Luo Dian Sheng
Published: July 2013

A new denoising method was proposed in the paper according to the characteristics of insulator infrared image with impulse noise. First, based on the pulse coupled neural network (PCNN) to detect the location of the impulse noise pixels, while maintaining the same non-noise pixels. and then according to the characteristics of the impulse noise, the window size of the filter was adaptively determined by calculating the noise intensity of the image. The pixels with maximum and minimum gray value in filtering window are excluded, using the left pixels similarity calculation out weights. A new weighted filtering algorithm is used to filter noise pixels. The experiments show that the method is better than the median filter in peak signal-to-noise ratio (PSNR), and has better image edge details protection ability.
The Research of Cancer Imaging by X-Ray In-Line Phase Contrast Imaging Technique
Authors: Tao Qiang , Luo Shu Qian
Published: July 2013

The hard X-ray in-line phase contrast imaging (HXILPCI) is a phase contrast technique that generates excellent contrast of biological soft tissues compared to conventional X-ray absorption radiography. We explore the application of HXILPCI in the diagnosis of gastric cancer and pancreatic cancer. These nude mice cancer samples were checked by HXILPCI to obtain projection contrast images of 9μm image resolution with CCD camera. The texture extraction was based on gray level co-occurrence matrix (GLCM). The corresponding morphological features of abnormal and normal tissues are analyzed. The produced phase contrast images of nude mice cancer samples show clearly biological tissues architectures and the size of cancer. The paper results show that HXILPCI can be a potential noninvasive technique to diagnose early cancer.
Quasi-Static Indentation Test on Composite Sandwich Panels with Foam Core
Authors: Xie Zong Hong , Yan Qun , Tian Jiang , Liu Xiao Yu
Published: July 2013

In accordance to ASTM test standards, this paper presents experimental studies on quasi-static indentation tests on sandwich panels with carbon fiber reinforced facesheet and foam core. The indentation force vs. displacement curves were obtained. A series of tests with different indentation depth were carried out to study the damage modes and damage propagation process of foam core sandwich panels under quasistatic indentation force.
A Simplified 3D Reconstruction Technique for Tomographic Particle Image Velocimetry
Authors: Quan Bao , Nan Jiang
Published: July 2013

Tomographic particle image velocimetry (Tomo-PIV) is a newly developed technique for three-component three-dimensional (3C-3D) velocity measurement based on the tomographic reconstruction of a 3D volume light intensity field from multiple two-dimensional projections. A simplification of 3D tomographic reconstruction model, which reduced from a 3D volume with 2D images to a 2D slice with 1D lines, simplify this 3D reconstruction into a problem of 2D plane reconstruction by means of optical tomography, is applied in this paper . The principles and details of the tomographic algorithm are discussed, as well as the study of ART and MART reconstruction algorithm is carried out by means of computer-simulated image reconstruction procedure. The three-dimensional volume particle field is reconstructed by MART reconstruction algorithm base on the simplified 3D reconstruction model which made a high reconstruction quality Q=81.37% prove that the way of simplification by MART reconstruction is feasible, so it could be applied in reconstruction of 3D particle field in tomographic particle image velocimetry system.
The Research of Graph Compression
Authors: Wang Hai Tang , Li Min
Published: July 2013

With the development application of image processing, the image compression has an important role in the future area. In order to more save memory space and more be used as a compressed representation of a image, a image is mapped into a graph, we give a new graphs compressed representation.
Deep Web Data Extraction Based on Regular Expression
Authors: Lin Tao , Qiang Bao Hua , Long Shi , Qian He
Published: July 2013

Data extraction is an important issue in Deep web data integration. In order to extract the query results of the Deep Web, it is firstly required to locate the target data block correctly. Due to the html source code of web pages can be parsed as well structured DOM, we proposed an effective algorithm for discerning the common path based on hierarchical DOM. Based on the common path and our predefined regular expression, the target data of the Deep Web can be extracted effectively. The experimental results on real websites show that our proposed algorithm is highly effective.
Multi-Scale DEM Generalization Processing in Different Landform Areas
Authors: Chen Yu Min , Wan Qiao , Gao Xiang , Li Ya Juan , Bi Xiao Mei
Published: July 2013

As a special kind of image, the grid-based digital elevation model (DEM) is directly related with the landform and topography feature. In the real word, there are various landforms, and the results of different methods for DEM processing vary greatly. However, the discussion of using different methods in different landform areas in DEM generalization is needed. Numerous methods have been proposed previously for DEM generalization without taking topographic factors into consideration, and the setting of threshold value of most algorithms is very subjective. Therefore, we investigate the DEM generalization, using two methods (z-tolerance method and compound method) in different landform areas and propose a new way for threshold values setting in generalization. The results show that the method we proposed is feasible and the compound method offers a better performance over z-tolerance method in most conditions, especially when comparing their performances of keeping streamline shape.
Segment of Tongue and Tongue's Venation Based on OpenCV
Authors: He Yang Ming , Du Jian Qiang
Published: July 2013

Characterization of tongue diagnosis is one of important content of the modernization of traditional Chinese medicine (TCM).Tongue image is acquired by camera. Then OpenCV, which is the tool for analyzing image, is used to process tongue image in the environment of Visual C++. Firstly, by some algorithms OpenCV is used to make color tongue image into gray image, and gray image into binary image. Then algorithms are used to extracts tongue target. From the tongue target, some features are extracted. These features combining with traditional Chinese medicine, diagnosis can be given.
Research on Clone Algorithm Applied in Edge Detection of Retinal Vessels
Authors: Cui Dong , Liu Min Min , Zhang Guang Yu , Qing Jiao , Chen Di , Guo Yong Xin
Published: July 2013

A marginal clone algorithm is proposed in order to make edge detection of retinal vessels image have better edge continuity and less detection points. It is applied in edge detection of retinal vessels with a combination of edge connectivity and noise removal algorithm based on analyzing image edge cloning theory and algorithms. Simulation results show that the edge image detected by the algorithm has solved problems of traditional edge discontinuities and too much noise. Moreover, it has better edge recognition performance.
A New Fast Computation Method in Mean Filter
Authors: Yang Hang Song , Wang Zeng Sheng , Gao De Feng
Published: July 2013

Mean of neighbor pixels is usually computed in image process, its computation cost is very high, which lead to the executing speed. A fast computation strategy is applied to get the mean of neighbor pixels. In our approach, the means of neighbor pixels located in fist column and line are computed, after that the iterative solution methods is adopted to compute neighbor means of pixels located in neighbor pixels of current pixel. The proposed approach do not change the filter result, but which can accelerate the running speed, especially for large image, finally, we used several image to test the approach, the experiment results indicate that the approach do not change the filtering premise and effectively reduce the computational complexity.
Artificial Immune Network in the Recognition of Yunnan Herbal Medicine
Authors: Huang Chao , He Jin , Zhao Ji Yong
Published: July 2013

Concerning simple and unscientific of Yunnan herbal medicine identification method, a kind of identification method based on Artificial Immune Network was proposed in this paper. Using high performance liquid chromatography extracts fingerprints from Yunnan herbal medicine,and then the data of fingerprints were trained by the Artificial Immune Network. In comparison with the traditional K-means algorithm,the experiment results show that Artificial Immune Network has higher classification and recognition ability.
Clustering Based on NMTF Algorithm
Authors: Huang Lei , Wu Chan Le
Published: July 2013

NMTF(Normalizing Mapping Training Framework) operates by mapping initial cluster centers and then iteratively training points to clusters base on the proximate cluster center and updating cluster centers. we regard finding good cluster centers as a normalizing parameter estimation problem then constructing the parameters of other normalizing models yields a space of novel clustering methods. In this paper we propose the idea using abstract of a text to members of a data partition in place of estimation of cluster centers. The method can accurately reconstruct meaning representation group used to generate a given data set.
A Power Analysis System for Cryptographic Devices
Authors: Ren Yan Ting , Wu Li Ji
Published: July 2013

In order to test the security of cryptographic devices against Side Channel Attacks (SCA), an automatic general-purpose power analysis system (TH-PAS-01) is designed and implemented. TH-PAS-01 is scalable and can be applied to many cryptographic devices when specific modules are installed. Using the system TH-PAS-01, correlation power analysis (CPA) are carried out on an AES chip under two working models: normal and shuffling mode. The security level of the countermeasure provided by the target chip is verified by TH-PAS-01. The experimental results show that the correct key of the AES chip is obtained with around 50,000 power traces when the chip was working under normal mode, while the whole key bits are not obtained with 960,000 power traces when the chip works under shuffling mode. The automatic general-purpose system TH-PAS-01 is feasible for security analysis on power analysis for cryptographic devices.
The Real-Time Transmission System of Computer Screen Based on Intranet
Authors: Chen Yu Ke , Ma Yu Long , Bai Yang
Published: July 2013

This paper probes the design and realization of the real-time transmission system of computer screen based on intranet and its focus problem is on screen catch and dynamic image real-time transmission by VC++. This system is able to realize loads balance and minor resource occupancy, so it is especially useful to multi-network classroom teaching.
Follow-Based Forward Obstacle Detection Using Vision Insensitive Feature for Road Cycling
Authors: Yang Jing , Gou Ming
Published: July 2013

Paper proposes a method for detecting general obstacles on a road by subtracting present and past in road cycling camera images. The image-subtraction-based object detection approach can be applied to detect any kind of obstacles although the existing learning based methods detect only specific obstacles. To detect general obstacles, the proposed method first computes a frame-by-frame correspondence between the present and the past in-road cycling camera image sequences, and then registries road surfaces between the frames. Finally, obstacles are detected by applying image subtraction to the redistricted road surface regions with a vision insensitive feature for robust detection. Experiments were conducted by using several image sequences captured by an actual in-road cycling camera to confirm the effectiveness of the proposed method. The experimental results shows that the proposed method can detect general obstacles accurately at a distance enough to avoid them safely even with different situations.
Formability Analysis with Precise Surface Building for the Automobile Outer Clutch Shell
Authors: Gobu Solomon Tiruneh , Cai Yu Jun , Yu Qiang
Published: July 2013

Majority of automobile and appliance components are made by deep drawing sheet metal process. So these growing needs demand a new design methodology based on metal forming simulation. With the help of metal forming simulation we can identify the problem areas and solutions can be validated. The aim of this research is to develop techniques that would reduce the amount of time spent during the tool qualifying stage. In this paper the draw tools on Automobile outer clutch shell surface are designed by the precise die surface at different dimensions and draw processes is analyzed with appropriate simulation parameters. From this we got the most reliable results. The compression with the tryout part shows that the simulation process can accurately predict the formability problems.
Research on the Construction and Testing of Typical Driving Cycles for Refuse Truck
Authors: Wang Chang Yuan , Qin Kong Jian , Gao Jun Hua , Yan Jia , Liu Xue Hao
Published: July 2013

In this paper, the driving trajectories of refuse transfer truck and collector truck are tested by GPS data logger. Afterwards, the 15 characteristic values of refuse truck and 12 characteristic values of typical driving cycles are analyzed by velocity fragment characteristic value analysis. Finally, we find that if the highway cycle of C-WTVC is canceled and the ratio of velocity interval 20-60km/h is extended, this driving cycle can be used as the testing cycle of refuse transfer truck. The CCBC cycle can be used as the testing cycle of refuse collector truck.
Medical Cable Assembly Line Planning and its Optimization Based on Product Service System
Authors: Xu Wei Tao , Miao Rui , Yang Wen Jun
Published: July 2013

The thesis adopts the SLP (System Layout Plan) to analyze the collected data of new PMS medical cable assembly product, manufacturing process and production material flow with the use of different tools, combined with constrained conditions related of the new facility to plan the process layout of the PMS medical cable assembly line, then adoptscorrelation analysismethods from production line balance theory and material flow project theory to improve layout of production line, so that the material transit distance could be shortened, the cost could be reduced and the balance rate of the production line could be improved. This thesis will be introduced by presenting the way of gathering solution for an example step by step.
Research on Assessment of Equipment Maintenance Training in Machine & Electric Company
Authors: Wen Jin Hua , Zhang Wen Yu , Chen Yan
Published: July 2013

To accumulate human resources and strengthen the core competitiveness in an company, the assessment method of maintenance training effectiveness based on cloud models is provided. This method blends together the subjective and objective information. At the same time, the method integrates the fuzzy and random completely, achieves the mutual conversion of qualitative and quantitative assessment, and deals with the uncertainty of the system assessment indexes effectively. On the other hand, the final results of the assessment can provide explicit improvement suggestions to ensure the continuous improvement of the training. Combined with an example, the method is validated finally.
Thermodynamic Analysis and Observation of Inclusions in RE-Austenitic Stainless Steel
Authors: Liu Xiao , Liang Jing Long
Published: July 2013

The effect of RE on modifying inclusions of 21Cr-11Ni austenitic stainless steel was studied by SEM and electron spectroscopy. Thermodynamic calculation was used to analyze the formation of RE inclusions in 21Cr-11Ni stainless steel. The result shows that sulfide and other irregular inclusions are modified to round or oval-shaped RE2O2S and RES.
Actors Affecting Housing Rental Affordability of Newly-Graduates in Metropolises in China
Authors: Hu Xiao Long , Qiu Zhi Yi
Published: July 2013

The purpose of this paper is to determine the factors affecting housing rental affordability of newly-graduates in metropolises in China. Social survey of questionnaire, analytic hierarchy process (AHP) and Delphi interview are the three main approaches applied in this paper. Factors affecting housing rental affordability of newly-graduates in metropolises are determined upon the sample of 4 biggest cities in China
Conceptual Model for the Evaluation and Optimization of Sustainable Land Use
Authors: Liu Dao Xin , Zhao Lu
Published: July 2013

Sustainable land use plays a vital role in the process of regional development. To pursuit the sustainable use of land resources will be the effective approach to address the conflictions among farmland conservation, social development and environment protection. This paper reviewed the relevant research and studies on the field of sustainable land use including its various definitions, the sustainability evaluation and optimization of land resources, got some conclusions about the prospects in the study on sustainable land use and finally addressed the conceptual model for evaluating and optimizing sustainable land use.
Effects of RE on Inclusions and Mechanical Properties of H13 Die Steel
Authors: Liu Xiao , Liang Jing Long
Published: July 2013

The effects of RE on the inclusions and the mechanical properties of H13 die steel were studied. The results show that the morphologies and sizes of inclusions in H13 steel are changed, and RE played a very good role of modifying inclusions. Fracture is changed from cleavage to ductile fracture by adding RE to H13 steel. And the mechanical properties of H13 steel are improved. In comparison with H13 steel without RE, the transverse impact toughness of H13 steel with RE is increased 33.61% at 0°C, and the tensile strength and reduction of area have been improved 10.74%, 6.3%, respectively.
Three-Dimensional Sedimentary Microfacies Modeling in Chunguang Oilfield - A Case of P2 Block
Authors: Dong Chen Qiang , Li Xue
Published: July 2013

Reservoir microfacies is an important factor affecting the reservoir heterogeneity, and it is significant to accurately predict reservoir microfacies distribution in order to improve oil and gas recovery. The stochastic reservoir modeling method has a strong geological suitability. The reasonable choice of the stochastic modeling method can effectively improve the accuracy of modeling. During the sedimentary facies modeling, sequence indicator simulation is used to characterize the spatial distribution of different microfacies with different variogram,to reproduce the complex microfacies spatial distribution.
Multi-Angle Digital Holographic Profilometry for Precision Measurements
Authors: Luo Xing , Jia Shu Hai , Xu Yong , Zhang Ye , Qu Wei Hong
Published: July 2013

A novel digital holographic interferometry used for measuring the 3D shape is proposed. The theory analysis and simulation of multi-angle interferometry are described. General holographic interferometry are not able to measure the discontinuous object because of the phase unwrapping. However, in this method, holographic interferograms are generated by object beam and reference beam with different incident angles. Height information of every point at the object surface is extracted independently without the phase unwrapping. The results of simulation demonstrate that this method can be used for measuring the complicated and discontinuous object. It will be useful for the measuring the large and complex discontinuous surfaces often exist in mechanical machining.
Changes of Structure and Magnetic Properties of Fe66Co24Si3B7 Amorphous Alloy under Heat Treatment
Authors: Kotvitckii Aleksandr , Kraynova Galina , Frolov Anatoly
Published: July 2013

In this paper features of structure at the atomic level, magnetic properties, and mechanisms of structural relaxation during thermal annealing of melt-spun ribbon Fe66Co24Si3B7(ribbon thickness is 28 microns) will be discussed. By means of differential scanning calorimetry and X-ray diffraction analysis of melt-spun alloy it has been shown that structural relaxation processes have complex multi-step nature, primarily related with instability of alloy. Using this data it has been shown that magnetic structure-sensitive properties, such as coercivity and magnetic moment, can be considered as structural relaxation indicators in amorphous alloys. The original amorphous material when heated to crystallization temperature partially passes to the crystalline state, causing the increase in residual magnetic moment and coercivity.
Solid Mass Flowrate Measurement System Using the Double-Elbow Method
Authors: Zhao Yan Jun , Meng Fan Wei , Qu Bin
Published: July 2013

The gas-solid flow is widely used in the enterprises. The real-time solid mass flowrate measurement is an important role to the enterprise production. Based on the gas flowrate measurement principle of the Elbow, the new Double-Elbow real-time solid mass flowrate measurement method in the gas-solid flow is brought out in this paper. The new method can finger out the mass flowrate directly and need not measure the mixture density in advance. The instrument on measuring the solid mass flowrate is developed based on the new method; the instrument is using the 8031 as the MCU; the measurement result can be displayed on the LED. The experiment on measuring the solid mass flowrate is carried out in the pneumatic conveying system. The experimental results prove that the instrument can be real-time on-line measuring the solid mass flowrate.
Analysis and Synthesis of 6-DOF Robot Measurement Errors
Authors: Qiu Ning Jia , Li Ming Zhe , Sui Zhen , Zheng Cheng Xiang , Li Ren Jun , Yao Wei
Published: July 2013

Robot motion accuracy plays a vital role in the production which makes use of industrial robots. This paper takes advantage of iterative algorithm to calibrate the robot joint parameters on the basis of setting up mathematical models of 6-DOF robot crossed technology on the mathematical model. It puts forward the method obtained by measuring the pose compared with the theoretical and the robot absolute posing deviation. It provides the basis of surface sheet metal precise scribing work on the next stage.
High Temperature Corrosion of Superheater Materials in Chlorination-Oxidation Atmosphere
Authors: Sang Sheng Huan , Duan Yu Feng , Chen Hui Chao , Zhao Chang Sui
Published: July 2013

Corrosion experiments were carried out with metals 20G, 15CrMoG and 12Cr1MoVG under the simulated atmosphere (N2-5%O2-1500μL/L HCl) of superheaters in waste plastic boilers to choose appropriate materials preventing high temperature corrosion. Corrosion dynamic curves were plotted by mass gain per unit area. Metal specimens after corrosion tests were analyzed by SEM-EDS and XRD. The results show that 20G has the poorest anti-corrosion abilities among the three materials; the corrosion process is involved in activation oxidation of chlorine. Addition of Cr in alloys can improve their corrosion resistance in the mixed atmosphere.
Defect Parameter Determination for Cylindrical Products
Authors: Hao Kai Yu , Miroshnikov Vadim
Published: July 2013

A calculating model is proposed to determinate the size of defect for extended product. The developed design of through-coil eddy current converter enable the output signal to determinate the parameter of defect. The analytical expression depending on the volume of identifiable defect is obtained.
Effect of Test Mode on Stress Sensitivity Evaluation of Full-Diameter Volcanic Rock
Authors: Wang Juan , Guo Ping , Peng Cai Zhen , Wang Fang
Published: July 2013

some reservoir property change which occurs during reservoir development has been studied, however, the study about the effect of test mode on stress sensitivity evaluation of full-diameter volcanic rock is few since the volcanic gas reservoir in Da-qing is buried deeply and the properties and flow mechanics are extremely complex. Therefore, there are two different test modes for stress sensitivity to study the effect of test mode on stress sensitivity evaluation. One of the test modes is to keep the internal pressure constant and change the confining pressure and the other is to change the internal pressure and keep the confining pressure constant. The study results are as follows: (a) the permeabilitys variation law at different test mode is similar when the net stress varies. There are two type, one is sensitive with high permeability since for well development of micro-fracture and pore connectivity, the other is not sensitive with high permeability since for the weak pore connectivity and micro-fracture; (b) the permeability could decrease with times of pressure cycling , so, the times of flow/shut in operation should be decreased as few as possible; (c) the relative variation of permeability in the mode of changing confining pressure is smaller than it in changing internal pressure, which means the stress sensitivity of changing confining pressure is weaker; (d) the results of changing internal pressure should be used since the test mode is more similar with the actual operation. The results are significant for gas-water RPs accurate determination and efficient development of volcanic reservoirs.
Specular Surface Measurement Based on Fringe Reflection
Authors: Zhu Rong Gang , Zhu Ri Hong , Li Jian Xin , Song Qian
Published: July 2013

This paper describes the principles and methods of specular surface measurement which is based on fringe reflection technique (PMD). This technique is based on incoherent imaging and phase shfit. CCD camera was used to record images of sinusoid fringes pattern which is generated by computer monitor and reflected respectively by reflector tested. The phase of modulated fringes that test the mirror collected by CCD can be obtained through the phase shifting algorithm, and the phase of the reference mirror can be calculated according to the structure, so the altitude difference between the two surface shape mentioned above can be obtained by the phase difference between them. The experiment fit the tested surface by 36 zernike polynomial and substitute the gradient data into equations to obtain the measured surface shaped by the least squares solution.
Zenith Wet Delay Estimation and Radio Source Sky Coverage
Authors: Zhang Zhi Bin , Liu Xiang , Gao Jin Ning
Published: July 2013

This paper investigates some approaches to improve the accuracy of parameter estimation in geodetic Very Long Baseline Interferometry (VLBI). By analyzing the radio source Sky Coverage (SC) for each antenna, a new approach, the method of condition number is proposed to find out reasonable time ranges for zenith wet delay (ZWD) estimation. The relative accuracy of Earth Orientation Parameters (EOP) is tested after implementing the method of condition number and the result shows that the relative accuracy of EOPs could be improved by ~3% with compared to the equal time range of 20min for ZWD estimation for CONT sessions.
Dielectric Loss Measurement Method based on the Energy Moment and Quasi-Periodic Interpolation
Authors: Liu Yun Peng , Zhang Jun Qiang , Su Zhi Ming , Zhao Tao
Published: July 2013

Harmonic analysis method for measurement of dielectric loss, due to the impact of fluctuations in grid frequency and higher harmonics, it is difficult to do the synchronous sampling, which reduces the accuracy of the measurements (especially the phase).In order to improve measurement accuracy, this paper presents a new method of calculation based on the energy moment of quasi-periodic interpolation algorithm. First, using a high frequency to sample the original signal, and then using the energy moment balance theory accurately measure the fundamental frequency, further calculating the integral period sampling rate and integral period samples, and last making integral period re-sampling and FFT calculation after interpolation. The simulation results show that this algorithm is high accuracy, good stability, less affected by the frequency fluctuation, harmonic proportion and initial phase.
A Remote Monitoring System of Three-Client/Server Architecture
Authors: Tao Ling Yang , He Ling Song , Zhu Jun Jiang , Zhang Chang Fan
Published: July 2013

This paper proposes a remote monitoring system that consists of three clients and servers. A web server is adopted to supply a remote visiting interface for browsers from Internet. A video server is installed to capture the live streaming video, and broadcast it to video clients that are embedded in browsers. More ever, a TCP DAQ (Data Acquisition) server is designed to acquire data from sensors, and then transmit them to VI (Virtual Instrument) clients that are also embedded in browsers. To support VI clients that are designed by different languages, such as C++, Flex or HTML5, multiple protocols are integrated in the TCP DAQ server. Through identifying the type of virtual instrument client that is connected to it, the TCP DAQ server can select a protocol automatically.
Non-Destructive Test of the Steel Bar by Using Piezoceramics Sheets
Authors: Zheng Zhu Peng , Lei Ying , Cui Xue Peng , Yu Song
Published: July 2013

Piezoelectric ceramics sheets are used to excite and receive ultrasonic guided waves in a steel bar. The multi-modes and disperse characteristics of guided waves within that are investigated theoretically and experimentally. The results show that ultrasonic guided waves can be generated and received by piezoelectric ceramics sheets which can be used to measure the length of the steel bar and detect the defection in it.
A Highly Selective Chemosensor Probe for Ag+ in 50% THF/H2O
Authors: Zhao Liang Rong , Shen Ping , Zhan Xu Qin , Yan Ming Xun , Yang Chang Ying
Published: July 2013

A highly selective chemosensor for Ag+ based on heterocyclic compound Diethyl 6-anilino-5H-2,3-dithia-5,7-diazacyclopenta (cd) indene-1,4-dicarboxylate (D1) was investigated. The deprotonation of N-H was observed easily in spectra of D1 (2.5×10-5 M) in 50% H2O/THF solution after NaOH addition, and the deprotonated D1 could interact with Ag+, resulted in the sharp decrease of deprotonated absorption. The addition of other metal ions would not produce an obvious change, which means quite extreme selectivity for Ag+ compared with other metal ions. The LOD of the method to detect Ag+ was 8.07×10-8 M. It is indicated that a novel high selective chemosensor for Ag+ was build up.
Research on the Digital Metering System and Verification Method of Digital Electrical Energy Meter
Authors: Chen Hao , Chen Fu Sheng , Xiang Jie , Shen Li Man , Li E Ying
Published: July 2013

The digital energy metering system applied in the smart substation are quite different from the traditional meter system, so its nessary to do some research on the digital metering system. With comparing the digital metering systems to traditional metering system, the application structure and characteristics of digital metering system is discussed, the traceability model of the digital electrical energy meter based on IEC 61850 protocol is also given.In the next part,we designed the verification system for digital energy meter, besides the standard digital power source in the test device, calibration device and the general controller are expounded. The performance of the verification system designed in this article shows that the method could be an effective solution to the verification and traceability of digital energy meter.
The Design of Lock-in Amplifier Based on DSP Builder
Authors: Zheng Qiang , Ma Cheng
Published: July 2013

Lock-in amplifier is widely used to detect weak signals from significant background noise. In this paper, an FPGA-based Lock-in amplifier is implemented on the DSP Builder platform to measure impedance between biological cells and electrodes. To improve the measuring accuracy, a narrow band low pass filter with low cut off frequency was implemented. This low pass filter consists of a five-stage cascaded integrator-comb filter, two half band filters and a FIR low pass filter. Simulation shows that with a system clock of 10MHz, the cut off frequency of the low pass filter is lower than 20Hz. Experiments demonstrate that the implemented lock-in amplifier is able to detect weak signal with strong noise, making it an attractive approach to implement lock-in amplifiers which is more flexible and can meet the needs for specified measurements.
Temperature Correction for Ceramic Powder X-Ray Diffraction at a Higher Temperature
Authors: Lu Da Yong , Cheng Wei , Chen Peng Yuan , Sun Xiu Yun
Published: July 2013

For powder XRD measurement at a higher temperature, there is a great difference (ΔT) between the temperature (T) detected by a thermocouple in a specimen stage and the actual temperature (Ta) of the ceramic powder surface irradiated by X-ray. The BaTiO3 ceramic powder was employed to make an temperature correction on heating in light of the change of the ~ 45º characteristic peak in the vicinity of its tetragonal-cubic phase transition point (TC = 130 °C). The thermal relaxation of BaTiO3 is considered. When the BaTiO3 ceramic powder was measured at TC, the phase transition occurred at T = 170 °C and ΔT was determined as 40 °C, which is 10 °C higher than that of the ceramic bulk. The error of temperature correction is less than ± 3 °C at TC. The approximation of a linear dependency Ta - T was given as a temperature correction line between 25 and 130 °C (Ta here).
Gear Fault Diagnosis Based on Time Domain Indexes on Harmonic Wavelet Reconstruction Signal
Authors: Chen Man , Ma Biao , Zheng Chang Song
Published: July 2013

The vibration character is analyzed with the methods of harmonic wavelet and time domain indexes of reconstruction with simulation signal and test data. Using harmonic wavelet compactly supported characteristic and box spectrum, the data is rebuild with some specific frequency wavelet coefficients. This not only realized the frequency domain filtering, the time domain information is also retained. The analysis of time domain indexes shows the method can identify the vibration amplitude growth derived from the noise or from the useful signals. The simulation and experimental results confirm that, with the harmonic wavelet reconstruction signal time domain indexes, the gear fault detection and diagnosis can be achieved under the condition of strong noise.
Research on the Methods of Reducing Carbon Emissions in Airspace Optimization
Authors: Zhu Dai Wu , Liu Zhi Heng , Yang Shu , Xu Jian Guo
Published: July 2013

The international community is increasingly concerned about saving energy and less carbon dioxide emissions. But with growing air passenger and cargo traffic, the airspace tension highlights would inevitably lead to the increase in carbon emissions. However, there is little research on the methods of reducing carbon emission in airspace optimization. So this paper does some research in this field. Firstly this paper provides and exemplifies the method for decreasing the carbon emissions in airspace optimization. Secondly it puts forward the BPR function model to estimating the amount of carbon emissions of the method of increasing the number of air routes and uses the Regression analysis to confirm the parameters αβ. At last utilizing the specific data testifies the huge contribution of reducing the amount of carbon emissions from airspace optimization.
Two-Side-Simultaneously-Observing Test System of Passive DMFC
Authors: Xu Long Yun , Ye Fang , Zhang Wei , Wu Shuo , Zhao Jian Fu , Guo Hang , Ma Chong Fang
Published: July 2013

In order to test passive direct methanol fuel cell and simultaneously observe anode and cathode of a fuel cell, we designed and built a test system. The test system consists of four units: temperature control unit, lighting unit, camera unit and test and data acquisition unit. With a two-floor placement design, we separated tested object and its close auxiliary components from other devices. The design is critical for changing inclination angle between outward normal of anode and gravity direction, which is important to the experiment. The control interface of the test system makes it suitable for a microgravity test system in NMLC (National Microgravity Laboratory Center). Considering the test system will be used for microgravity experiment besides routine normal gravity experiments, many specific issues have been taken into account.
Preliminary Application of Terrestrial 3D LiDar in Corridor Defects Detection of Overhead Transmission Lines
Authors: Chen Jin Mu , Zhang Chun Lin , Wang Ren De , Lu Xian Feng , Wang Wei , Wang Xun Feng , Shen Xiao Jun
Published: July 2013

Based on a brief introduction of the operational principle of terrestrial 3D LiDar, this paper describes some typical defects detection methods of security distance in the overhead transmission line with living examples. These tests are realized by the Z+F Imager 5010 terrestrial 3D LiDar and Polyworks. The research results show that terrestrial LiDar technology can achieve the defect evaluation of defect detection of security distance in the overhead transmission lines. And this technology has many advantages, such as portable, security, intuitive and high precision.
Research on Fault Diagnosis for Gear Based on Ensemble Empirical Mode Decomposition and Slice Bi-Spectrum
Authors: Tang Gui Ji , Wang Xiao Long
Published: July 2013

A new method on fault diagnosis for gear based on ensemble empirical mode decomposition and slice bi-spectrum is proposed. Firstly, fault signal was decomposed into a series of intrinsic mode function components of different frequency bands by EEMD, and then calculated the envelope signal of IMF component by Hilbert demodulation method. Finally, analyzed the envelope signal by slice bi-spectrum and extracted the fault characteristic frequency. The anti-alias decomposition capacity of EEMD and capabilities of noise suppression and non-quadratic phase coupling harmonic components elimination of slice bi-spectrum were verified by analyzing the simulation signal. The analysis results of gear pitting failure signal and gear wear fault signal showed that this method could judge gear fault type accurately and has a certainly degree reliability.
Preparation of Ultrafine Barium Sulfate Using Sodium Sulfate Content Wastewater
Authors: Li Pei Xin , Zhao Feng Qing , Liu Shao Jie
Published: July 2013

The wastewater from folic acid production contains a large amount of sodium sulfate. In this paper, this sodium sulfate wastewater was used to react with the industry black salt (barium sulfide) to prepare barium sulfate. By adjusting the feeding mode, reaction temperature, reactant concentration and stirring speed, the optimal experimental condition was determined. The barium sulfates particle size under this condition was 320 nm, with good whiteness but low energy consumption. The product not only turns the waste to useful product successfully, but also meets Chinese policy of energy-saving, emission reduction and sustainable development.
Posture Demodulation Study on Carriers Measured by a Novel MEMS Gyroscope
Authors: Wang Ling , Zhang Fu Xue , Song Xiao Hua , Chen Xiao Fang , Cai Xiao Qing , Zhang Yu Ying , Shi Xing Chun
Published: July 2013

Non-driven structure silicon micromechanical gyroscope can sense rolling, pitching and yaw angular rate of the rotating body at the same time, which is suitable for rotating body gesture detection. But this characteristic is not suitable for non-rotating flight carrier. So this study uses micro motor to provide spin angular velocity for non-driven silicon micromechanical gyroscope, and to further generate gyroscopic effect which is sensitive to the attitude information, including rolling rate, yaw angular rate and pitch angular rate of low-speed rotating or non-rotating object. The study analyses the output signals based on simulation rotating object experiments of three-axis moving of silicon micromechanical gyroscope, the study uses phase based method to determine deflection polarity, and uses double accelerometer multiplication algorithm to demodulate the output signals of gyro. All above results provide a basis research results for further realize the goal of real-time demodulation of gyro signals when silicon micromechanical gyroscope is applied to the non-rotating and rotating flight carrier.