bluuebunny/crossref_metadata_2025 huggingface dataset:
A 2D Numerical Model for Simulation of Two-Dimensional Circular Dam-Break
Authors: Liu Ming Qin , Liu Y.L.
Published: October 2011

The purpose of this paper is to present a 2D depth-averaged model under orthogonal curvilinear coordinates for simulating two-dimensional circular dam-break flows. The proposed model uses an orthogonal curvilinear coordinate system efficiently and accurately to simulate the flow field with irregular boundaries. As for the numerical solution procedure, The SIMPLEC solution procedure has been used for the transformed governing equations in the transformed domain. Practical application of the model is illustrated by an example, which demonstrates that the mathematical model can capture hydraulic discontinuities accurately such as steep fronts, hydraulic jump and drop, etc.
Fault Diagnosis of Micro-Grid Based on Advanced Petri Net
Authors: Shi Ji Ying , Sun Wen Shan , Li Chun Ling
Published: October 2011

Micro-grid is next generation of distribution system. The paper mainly investigates fault diagnosis issue of Micro-grid by using advanced Petri net technology. The paper puts forward diagnosis model of micro-grid based on Timed-colored Petri Net embedded object-oriented. The approach encapsulates each protection information, the associated breaker information and electrical components information and creates corresponding database tables. When the protection or breaker action occurs, through the means of communication to obtain the corresponding action information, use protection information as the keyword to search the database table to read the records and pass the record which has been encapsulated into object to the micro-grid diagnosis sub-module. The paper raises three delay levels, by adding time delay to achieve the priority of the corresponding logic. At last, example and verification show that Fault Diagnosis of Micro-grid based on Timed-Colored Petri Net (T-CPN) is valid.
The Evaluation of Lightness and Chroma Difference for Images According to Color Difference Formulae
Authors: Liu Hao Xue , Chen Yuan Dou , Hao Yun Long , Zheng Ning Ning , Jiao Ao
Published: October 2011

The computation and evaluation of color difference for images is a hot topic. In order to explore the calculation method of evaluating color difference sensation for similar images, 68 pairs of test images were made, which were made from ISO SCID 400 color images by altering their lightness and chroma respectively to cause different color difference scales, and tested by psychophysical experiment. The experiment results showed that the calculated color difference by each formula had a relation to the color difference sensation and the color difference formulae were optimized based on the experimental data.
Research of Scalability Model Based on Cloud Storage System
Authors: Ge Jun Wei , Deng Yong Long , Fang Yi Qiu
Published: October 2011

Scalability is one of the most important indicators to for performance of cloud storage system. In this paper, firstly, we pointed out limitations of three classical scalability evaluation methods with conditions of iso-speed, iso-efficiency and iso-ratio of parallel overhead to computation, when describing scalability. Then, we proposed a new scalability evaluation model which was suitable for cloud storage environment and named as EP scalability model. The EP scalability model directly reflected the performance of cloud storage system when the system scale and storage tasks expand.
An Image De-Noising Method Using Directions of Wavelet Decomposition Sub-Bands
Authors: Cai Zheng , Tao Shao Hua
Published: October 2011

In this paper, an image de-noising method using directions of wavelet decomposition sub-bands is proposed. Wavelet coefficients are correlated in a small area, and the wavelet transform uses wavelet coefficients in three directions to describe image information, so in each sub-band the proposed method only calculates neighboring wavelet coefficients in a certain direction rather than in eight directions. Compared with other wavelet de-noising methods, the proposed method can achieve higher peak signal to noise ratio.
Research of Workflow Based PDM System under the Circumstances of Concurrent Engineering
Authors: Ding Shu Hui , Wang Hai Xia , Meng Xiao Jun , Zhong Pei Si
Published: October 2011

According to discussion of process management, workflow technology and the requirement of CE to PDM system, workflow based PDM system is built in this thesis, which takes process management as the main line to implement the projects management, parts management and documents management. PDM prototype is built and workflow based process management in PDM system is validated.
Solution of Constraint Force of Frame with Shape of T by Principle of Conversion Method
Authors: Yu Xiao Jin
Published: October 2011

Owing to lack of geometric method for calculating frames with the shape of T, the conversion method is used to resolve the frames in which no joint has lateral displacement. It puts forward the analysis steps of the solution of the frame. The concrete process of calculation belongs to primary computation of algebraic equation. It gets analytic solution. The calculation sequence of an example of a frame is advanced.
Fatigue Life Prediction Based on Strengthening and Damaging
Authors: Song Li , Lu Xi
Published: October 2011

Based on moving S-N curve, a new method of fatigue life prediction for vehicle component in random loading spectra was put forward. In the new method, both strengthening and damaging of loads are fully considered in fatigue life prediction of vehicle component. The results of fatigue life prediction showed that the new method was more exacter than that of other life prediction models, such as Miner's rule, modified Miner's rule, Manson's bilinear theory and Corten-Dolan's theory. Only this new method could exactly predict the fatigue life of vehicle component in original or slightly strengthened loading spectra.
Numerical Simulation of 3-D Chemical Non-Equilibrium Flow in the Afterburning Chamber of Solid Ducked Rocket
Authors: Cui Li Kun , Zhang Yong Zhi , Li Zhuo
Published: October 2011

In order to reveal the complex turbulent combustion processes in the afterburning chamber of Solid Ducked Rocket (SDR), Based on the fundamental equations of hydrokinetics and elementary principles of radical reaction kinetics, using multi-component chemical reaction equation of containing Mg and Al components, the numerical simulation of chemical non-equilibrium flow in the afterburning chamber of SDR is processed and effects of the air inlet angle on the afterburning chamber is studied by using Fluent software. The results show that pressure distribution is more balanced, temperature distribution is very uneven and flow is extremely complicated in the afterburning chamber. Combustion efficiency can be increased by improving the air inlet angle.
Digital Image Stabilization Algorithm Based on Mean Shift Corner Tracking
Authors: Peng Jian , Min Qing , Xu Zhi Qiang
Published: October 2011

The core technology of electronic ois is the motion estimation techniques, such as, BPM, RPM, FTA ,PA, BM and so on[1]. Based on the excellent tracking performance of Mean Shift algorithm in complicated scene, this paper proposed a target tracking method based on corner, and then work on motion compensation and motion estimation.
A New Multi-User Beamforming Algorithm
Authors: Wang Yan Wen , Yin Zhi Wei
Published: October 2011

In R9 version of LTE system, the double multi-user beamforming is proposed. To suppress inter-user interference of multi-user multiple input multiple output (MU-MIMO) system, a new algorithm is presented in this paper: on condition that current user eliminates the interference to other users, it designs its own transmit beamforming vector; if all users take such measures, the interference that each user suffers from others will be reduced to a minimum, which improves the performance of the system. Simulation shows that, as the number of user increases, the algorithm used in this paper can reduce the bit error rate (BER) of the system more obviously than the traditional signal-to-leakage-and-noise ratio (SLNR) algorithm.
A Knowledge Based Threat Analysis in Trustworthy Software Engineering
Authors: Li Xiao Hong , Liu Feng Xu , Feng Zhi Yong , Xing Jin Liang
Published: October 2011

In recent years, the security of software becomes one significant feature of software. This paper improves trustworthy software engineering through a knowledge based expert system. We propose the knowledge collection and organization method, and threats analyzing algorithm in detail which are the kernel of the expert system. The software threat information is divided into threat state and exploit, and stored in the knowledge database together with the state production and exploit production representing the relationships between threat state and exploit. The threat analysis calculates the threat degree quantitatively of an application based on this knowledge in a formal way and give security advice to mitigate threats. Our method can reduce the work of an experienced security expert which is time consuming and economic costly, therefore popularizes the trustworthy software engineering.
Research on Properties of PZT Piezoelectric Ceramics by Finite Element Softeware ADINA
Authors: Guo Chen Jie , Zhang Chang Song
Published: October 2011

In this paper, the finite element model of piezoelectric ceramics in line with the experiment results was established according to piezoelectric structure field and the coupling of the electric field, deformation of representative PZT piezoelectric ceramics under the voltage was analysed in using finite element analysis software ADINA according to establishing geometric model, defining boundary conditions and materials, Coupling calculation. Consistency between simulation results and experimental results is improved and lay the foundation for the realization of the piezoelectric ceramic shapes and vibration control.
Research on Differential-Mode Conducted EMI of Three-Phase PWM Rectifier AC Side
Authors: Wei Ke Xin , Duan Rui Xia , Liang Bin
Published: October 2011

Taking three phase PWM rectifier as the research object, according to interference mechanism of the rectifier bridge, this paper describes the equivalent circuit of AC side differential mode interference and calculates the interference source voltage and differential mode interference voltage of the three phase PWM rectifier AC side in 150KHz-30MHz frequency band. Then we analyze the model of the equivalent circuit diagram using the Saber software and verify the validity of the model and the accuracy of the calculation through experiments.
Target Tracking Based on Particle Filter with Multi-Path Particles
Authors: Sun Qi Yuan , Li Liu Sheng , Chao Zuo Liang
Published: October 2011

Visual tracking is a key issue for autonomous navigation, intelligent monitoring system and so on. While a Particle Filter for tracking is designed, the target in image may be out of range, and the tracked target will be lost since the target image size keeps changing. A method for tracking a mobile target with visual image, Particle Filter with multi-path particles (PFWMP), is proposed to solve the above problem in this paper. Here, the method is based on the wavelet transform incorporated in traditional Particle Filter, and particles are made to move in original image and the image processed by wavelet transform. The results show that the improved approach using multiple particles can enhance the robustness of tracking algorithm and improve tracking accuracy.
Modulus and Internal Friction of W-Doped VO2 Thin Films
Authors: Li H.Q. , He X.X. , Liu T. , Nie Z.H. , Lv X.Q.
Published: October 2011

The thin films of W-doped VO2were synthesized onto Mo substrates using reactive DC and RF magnetic co-sputtering deposition techniques. The effects of W dopant on the semiconductor to metal phase transition of bare VO2were investigated with measuring X-ray diffraction (XRD) , QJ31Wheatstone Bridge and the internal friction and modulus vs temperature. The transition temperatures of VO2thin film from monoclinic semiconductor to tetragonal metal are decreased from 68°C to 40°C with the curves of resistance vs temperature and modulus vs temperature. In addition to, the size of grains W-doped VO2is more than that of un-doped VO2, but more smoother.
Research on Self-Generated Voltage of Friction Pair in Dry Wear Process
Authors: Huang Zheng , Shi Tie Lin
Published: October 2011

When friction pair contact with each other, self-generated voltage is a macroscopic potential difference manifested in the face of friction pair as a result of the interaction of diversified factor. It is consisted of contact potential between two different materials, thermal electromotive force in the friction process between two different materials, potential difference created by charge change in the contact and abruption process of friction pair and potential difference created by material transfer in the friction process. Self-generated voltage is measured in the paper through measuring system, and then the relation between self-generated voltage and frictional characteristic is analyzed. It is concluded useful to study observation and diagnosis of equipment friction with self-generated voltage signal of metal friction pair.
Stray Losses Study for a Power Transformer Based on 3D FEM
Authors: Song Zhan Hai , Wang Yi Fang , Mou Shuai , Wu Zhe , Zhu Yin Hui , Xiang Bing Fu , Zhou Ce
Published: October 2011

Base on three dimension (3D) finite element method (FEM), a electromagnetic model for a power distribution transformer is established. The core loss, stray losses in structural components are simulated, the effects of magnetic shunts on tank losses are studied, then compared with experiments. The core loss, the decrease of stray losses when using magnetic shunts are in accordance with experiments. Studies indicate that tank loss is the most impartment part of stray losses in this model, magnetic shunts are effective in reducing stray losses.
Fabrication of 10Gbps TOSA Packaged EML Module Based on Optimized CPW Feed Line
Authors: Xu Cheng Zhi , Lu Kun Zhong , Liu Wei Hua , Fan Shi Bing , Xu Yuan Zhong
Published: October 2011

We fabricated and analyzed the 10Gb/s EML TOSA packaged module. An optimized CPW feed line was employed for the module, and greatly improved the performance of the module compared to the module with the conventional CPW. With this optimized CPW feed line, a clear back to back (BTB) eye opening of optical output waveform with mask margin of 20% and extinction ratio was 10.45dB.
Design of Intelligent Electrode Design System
Authors: Wang Lv Yuan , Li Huan , Huang Jun , Xu Yue Lan , Gao Ying
Published: October 2011

Lots of information including vary raw materials components and mechanical properties should be involved in the electrode design process. It was very difficult to manage them. In this article, an effective solution by simulating the artificial design process of electrode was presented in the design of intelligent electrode design system (IEDS). That successfully realized series functions such as electrode formula management, electrode intelligent design. Shared file, named pipe, and file mapping were proposed to solve the communication problem between design module and prediction module which were developed by using different languages and platforms.
Model Predictive Control for Multilevel Inverters in Microgrids
Authors: Bo Huai Shi , Yang Jian Feng
Published: October 2011

Power electronics converters play an important role in realization and performance improvement of electrical power system. With the demand for new power resource and better power supply quality, more and more distributed energy resources (DERs) come into practice. As a new network configuration, microgrid attracts much attention, consequently lots of new power electronics devices and engineering experiments are brought forward. The paper focus on the multilevel inverters in microgrid, discusses its topologies and characteristics. A model predictive controller is designed to decrease common mode voltages and errors between the capacitor voltages and their reference values. Finally, simulation diagram, parameters and results using software PLECS are provided to demonstrate the merits of multilevel inverters and the validity of proposed control method.
MPPT of Photovoltaic Power Generation Based on Double Fuzzy Controllers
Authors: Wang Yun Liang , Xie Jun Di
Published: October 2011

This paper mainly discussed the non-linear characteristics of photovoltaic cell and the importance of maximum power point tracking (MPPT) strategy. Most of MPPT control methods had the shortcomings of inaccuracy, tardiness, complexity and big fluctuations nearby the MPP which greatly reduced the efficiency of large photovoltaic power generation system. Double fuzzy logic control (DFLC) method can solve this problem The judgment condition of choosing FLC was listed in which FLC 1 targeted to less shake and made the curve become more smooth and steady nearby the MPP, FLC 2 was combined by fuzzy control and PID algorithm, and both of them aim to realize the optimization control of PV system. The results of simulation show that the proposed control strategy can track the MPP of PV system very accurately and quickly along with the rapid change of the ambient environment.
Nonlinear Inertia Weigh Particle Swarm Optimization Combines Simulated Annealing Algorithm and Application in Function and SVM Optimization
Authors: Jiao Bin , Xu Zhi Xiang
Published: October 2011

This paper proposes an improved particle swarm optimization algorithm (PSO) for the global and local equilibrium problem of searching ability. It improves the iterative way of inertia weight in PSO, using non-linear decreasing algorithm to balance, then PSO combines with simulated annealing (SA). Finally, the optimization test experiments are carried out for the typical functions with the algorithm (ULWPSO-SA), and compare with the basic PSO algorithm. Simulation experiments show that local search ability of algorithm, convergence speed, stability and accuracy have been significantly improved. In addition, the novel algorithm is used in the parameter optimization of support vector machines (ULWPSOSA-SVM), and the experimental results indicate that it gets a better classification performance compared with SVM and PSO-SVM.
Simulation of an Improved Method of Maximum Power Point Tracking for Photovoltaic Array
Authors: Zhao Gang , Jiang Hui
Published: October 2011

It needs to track the maximum power point for enhancing the output power of the photovoltaic power generation systems. Perturbation and observation (P&O) method is one of the control algorithms to realize maximum power tracking, which has extremely wide range of application because its tracking method is simple, the control circuit is easy to digitize and it is not strict to the accuracy requirement of sensor, etc. Comparing with traditional constant-step perturbation and observation method, which has disadvantages of power oscillation and slow tracking speed, this paper presents an improved method. The system is established in Matlab/Simulink, and the simulation results show that this method can track the maximum power point of the photovoltaic array quickly and accurately and the power oscillation is feeble.
Application of Accelerated Iterative Method in Calculating Wave Length in Harbor Engineering
Authors: Wang Shou Jun , Wei Ming Wei
Published: October 2011

In this paper, a specific application accelerated iterative method is presented for calculating wave length in harbor engineering, which includes calculation method of wave length and specific implement in Excel. Different wavelengths into the iteration formula to calculate the same result can be obtained, but the calculation speed of different methods have significant differences to arrive at the fastest method . Calculated by accelerating the iteration method can significantly increase the computing speed and calculation steps. After the derivation of several methods and calculations show that Newton iteration is the fastest way to convergence speed, in the practical range of about 10 steps through the iterative convergence results can be obtained.
Anti-Rear-End Collision Warning System Based-on Zigbee for Highway Vehicle
Authors: Li Wen Jun , Feng Kui , Zhang Hong Kun
Published: October 2011

The majority of traffic accidents on the highway is rear-end collision. According to statistics about ninety percent rear-end collision can be avoided if there is 1 second pretreatment time for drivers. So it is necessary to develop automotive rear-end collision warning system to prevent the occurrence of accidents. The anti-rear-end collision warning system based on Zigbee technology is designded in this paper. Vehicle speed, acceleration and other traffic information among the nodes can be exchanged on real-time by using self-organizing wireless sensor networks consisted by Zigbee network nodes. A vehicle safe distance model is established after considered the effects of other traffic safety factors, and then, the actual distance measured by radar is compared with the safe distance so as to provide early warning, alarm and other driving information to drivers. The experiment results show that the system can effectively provide early warning, avoid rear-end collision, and improve active safety of vehicles.
Behaviour and In Situ Tests of Self-Drilling Prestressed Anchors
Authors: Xie Xin Yu , Zhu Kai , Hua Jin Yao , Ying Hong Wei , Liu Kai Fu
Published: October 2011

The self-drilling prestressed anchor is a type of ground anchor used to transmit the applied tensile load into soil or rock through cement grout. The paper outlines a general construction procedure using a special self-drilling bit. Based on the load-transfer mechanism, the construction procedure is presented for load-dispersed ground anchors. In-situ pullout tests were carried out for three self-drilling prestressed anchors of the load-dispersed compression type. The test results showed that the ultimate pullout capacity could reach 800 – 1,000 kN. After prestressing, the displacement of the anchor head was decreased by 50 % – 70 % for a low load level and 30 % – 40 % for a high load level, and the displacement induced by elastic deformation was much smaller than that induced by plastic deformation. These results demonstrate that this anchor type is suitable and economical for practical engineering needs.
MHD Flow of Shear-Thinning Fluid over a Rotating Disk with Heat Transfer
Authors: Ming Chun Ying , Zheng Lian Cun , Zhang Xin Xin
Published: October 2011

This paper studied the Magneto hydrodynamic (MHD) flow and heat transfer of an electrically conducting non-Newtonian fluid over a rotating disk in the presence of a uniform magnetic field. The steady, laminar and axial-symmetric flow is driven solely by the rotating disk, and the incompressible fluid obeys the inelastic Ostwald de-Waele power-law model. The governing differential equations were reduced to a set of ordinary differential equations by utilizing the generalized Karman similarity transformation. The nonlinear two-point boundary value problem is solved by multi-shooting method. Numerical results show that the magnetic parameter and the power-law index have significant effects on the swirling flow and heat transfer.
Research on the Changing Regularity of Ionic Current and Cylinder Pressure when the Gasoline Engine Knocks
Authors: Sun Yue Guo , Yuan Zhao Cheng , Li Li Ying , Li Shi Yu , Liu Meng
Published: October 2011

Theoretically speaking, we can achieve the detection and control of the parameters of engine knock and ms-PULSE etc effectively and accurately by analysis the ionic current signals. But in actual application, it is difficult to detect the ionic current signals because of the interference of high pressure from high-tension ignition system. At present, the application of ionic current signal in the detection and control of engine knock is still in the initial early stages. We optimized the signal acquisition system, interference the suppression, achieve the effective detection of ionic current signal in the tests we mentioned in the topic, and then, we analysis and compared the character of ionic current and cylinder pressure signals we collected under different working conditions, exploration and testing is carried out for the further recognition and control of engine knock using the ionic current signals.
An Improved High-Accuracy CORDIC Algorithm for DSC in Endoscopic Ultrasonography System
Authors: Li Yan , Hao Yun Xia , Li Ming , Wang Yi , Chen Xiao Dong , Yu Dao Yin
Published: October 2011

An Improved High-Accuracy CORDIC (COordinate Rotation Digital Computer) algorithm for digital scan conversion is presented in this paper to enhance the accuracy and speed of coordinate conversion for Endoscopic Ultrasonography. Several optimization methods are carried out to make coordinate conversion implemented more exactly with fewer resources of FPGA. In the paper, the Cartesian coordinates are re-demarcated to save LE (Logic Element) resources of FPGA. The bit width of data, the scale factor correction and the convergence range are all optimized to improve the accuracy of the algorithm. Further more, a special processing for the near-field data is carried out to reduce the errors of digital scan conversion. With a full pipeline structure implemented on FPGA, the Improved High-Accuracy CORDIC algorithm is validated by both simulation and real-time ultrasound imaging experiment, making the accuracy enhanced and the image quality improved.
Data Stream Frequent Closed Item Sets Mining Based on Fast Sliding Window
Authors: Chen Zhi Hua , Luo Jun
Published: October 2011

According to the mobility and continuity of the flow of data streams，this paper presents an algorithm called NSWR to mine the frequent item sets from a fast sliding window over data streams and it meets people’s needs of getting the frequent item sets over data that recently arrive. NWSR, using an effective bit-sequence representation of items based on the data stream sliding window, helps to store data; to support different support threshold value inquiry through hash-table-based frequent closed item sets results query method; to offer screening method based on the classification of closed item sets for reducing the number of item sets that need closure judgments, effectively reducing the computational complexity. Experiments show that the algorithm has better time and space efficiency.
Stochastic Traffic Assignment Model Based on Travel Time Reliability
Authors: Cheng Yi Ran , Han Yin , Jiang Xin Kai , Gu Jia Lei
Published: October 2011

Considering the un-deterministic transportation networks, the paper proposes the change of the route choice decisions under the stochastic transportation networks. The route choice behavior is described as a choice for a time shortest route which is subject to a time-reliability level. The paper also considered this new route choice behavior in the stochastic user equilibrium model, and proposed stochastic user equilibrium model based on the optimized reliability travel time route choice behavior in the stochastic networks. The equivalence and uniqueness of the solution of the model are demonstrated. Numerical results of a small network show that the proposed model can reflect the real traveler’s route choice behavior in stochastic transportation networks.
Relationship between Output Parameters and DOF of Single Loop Mechanism, Link Group
Authors: Zhang Yi Tong , Zeng Da Xing , Yang Yan Dong , Lu Wen Juan , Mu De Jun , Yi Ya Li
Published: October 2011

Deficiencies are existed for currently formulae of mobility calculation for single loop mechanism. It doesn't reflect the constraint imposed to output components by link group. By analyzing the kinematic parameters of link groups, this paper proposes a new method to calculate the mobility of link group, which is the difference of the sum of the degree of freedoms (DOFs) of all the kinematic pairs and the rank of the kinematic parameters of link groups. Also the DOF can be obtained by the total DOFs of link groups and the rank of kinematic parameters of basis point of the output link. It can be concluded that the new method can not only express the move state of the output link, but the constraint imposed to output components by link group also be reflected. The research results can provide a reference for the structural analysis of the single loop.
Spatial Distribution of Heavy Metals in Surface Soil of Zhejiang Pinghu
Authors: Li Qiong , Hao Chun Ming , Liu Hui Lin
Published: October 2011

In this paper, the spatial structure of heavy metals were quantitatively described to soil in Zhejiang Pinghu City based on statistical methods, and the main factors of the spatial structure of heavy metals were discussed in the study region. The results showed that the soil experimental variogram model fitted better in the study area in the 7 heavy metals of As, Cr, Cd, Cu, Ni, Pb, and Zn. Principal component analysis reflected the elements Pb, Zn, Cu, As, Cr and Ni distribution in a same component; and elemental Hg and Cd each a separate component.
Decolorization Effect of Mycelium Pellet on Saline Azo Dye Wastewater
Authors: Zeng Jian Zhong , Lin Jun Yue , Zhou Song , Yi Xiu Guang , Zeng Shi Sheng
Published: October 2011

A fungus with efficient dye decolorization and that generates a microbial flocculation agent was isolated from a wastewater environment and screened. This bacterial strain imposed a significant decolorization effect on azo dyes. On the basis of morphological and microscopic features, the fungus was identified and named A-6. The results show that the decolorization process of the fungus exhibited two types of actions: adsorption decolorization of mycelium and flocculated decolorization of extracellular products in the dyes. The decolorization ratio reached 99.20%
Analysis for the Uncertainty and Changeability of Groundwater Causticity
Authors: Wei De Jian , Zhang Xin Gui
Published: October 2011

During wet season and dry season, the groundwater quality analysis results of one engineering site in Nanning indicated that the causticity of groundwater mainly included acid causticity (pH value), calcareous causticity (corrosive CO2) and leaching causticity (HCO3-). Though the twice analysis results of water causticity are both moderately corrosion, the types of decomposed corrosion are different. It indicated the uncertainty and changeability of decomposed corrosion. In actual projects, some special ingredients in groundwater, the site natural environment and hydrologic geologic conditions should be considered together to define the groundwater’s causticity. Moreover, the change of site hydrologic geologic conditions caused by the construction should be considered, because this change can also influence the groundwater’s causticity. In addition, the groundwater’s causticity will influence the selection of cement types and the type of cement will influence the type of foundation, then all these will influence the construction cost finally. So, the change of groundwater’s causticity caused by the site hydrologic geologic conditions should be considered at engineering design time.
Development and Application of PCBN Tools Used in High-Speed Milling 30CrMnSiA
Authors: Ding Zhi , Yang Hai Dong
Published: October 2011

Aiming at the problems of coated carbide cutting tools used in Quenched 30crMnSiA steel milling such as poor cutting performance and shot service life.We have designed and produced a new type of PCBN tools as cutter head by welding. After high-speed milling and testing the Quenched 30CrMnsiA steel, we have optimized the process parameters and improved production efficiency. The experiment proved that the new type of PCBN tools can replace the carbide coated tools completely, It not only increases the tool life, but also reduces the tool costs, and fully demonstrated that the PCBN tools also have good application prospect in high-speed milling.
A New Approach to Determine Water Influx Rate for Reservoir with Bottom Water
Authors: Zhang Wen Zhong , Wang Jian Ping
Published: October 2011

The average reservoir pressure and water influx rate are two important parameters for reservoir with active bottom water. The paper, based on the model of KEITH, provides a solution by inversion of Laplace and Hankel, and obtains the relation between the average dimensionless reservoir pressure and water influx. If one is known, then the other can to be confirmed correctly. Compared with solution method of material balance, the affection of anisotropy is considered. In addition, sensitivity analysis of affecting factors on reservoir pressure is presented.
Simultaneously Monitoring of Chromatic Dispersion and Polarization Mode Dispersion for DPSK Signal Based on RF Spectrum Analysis
Authors: Zhao Jian , Lu Chao , Ma X. R.
Published: October 2011

We have demonstrated a method to monitor CD and first order PMD simultaneously of DPSK signal based on the RF spectrum analysis. The monitoring sensitivity can reach 56.7ps/nm/dB and 3.1ps/dB for CD and DGD, respectively.
Performance Analysis of Application Layer FEC to Disaster Warning Distribution Based on COMPASS/Beidou
Authors: Xue Rui , Cui Rui Xue , Li Xiao Ru , Zhou Tong
Published: October 2011

The COMPASS/Beidou Satellite Navigation System is no-blind zone for China and limited transmission capacity. It is critical for increasing the performance of disaster warning distribution by the COMPASS/Beidou system. By further analyzing the characteristics of transmission of COMPASS/Beidou, we find the method of solving that problem and also introduce some optimizations into the algorithm. The algorithm is based on application layer FEC to achieve the warning transmission probabilities. Simulation results show that the new scheme can efficiently be used disaster warning distribution system.
Experiment Techniques of Mechanical Properties of Brittle Materials with Pre-Existing Cracks
Authors: Wang Ming Li , Yang Xiu
Published: October 2011

Rock mass is a multi-fractured body. Regardless of the size of these flaws, they can reduce the strength of rock materials [1]. As rock is not a transparent material, the process of deformation to failure is difficult to observe. Transparent brittle materials are able to solve this problem. This paper provides a production method of prefabricated defects. And the results prove that the frozen PMMA and glass are very similar with rocks in breaking process and mechanical properties.
The Design of CAN/USB Embedded Adapter
Authors: Luo Yong Gang
Published: October 2011

In order to realize high-speed and real-time communications between canbus and usb bus, a can/usb embedded adapter is designed in this paper. The hardware of the system consists mainly of AT89S51 as the local processor and PDIUSBD12 as the USB interface device, the sja1000 as the canbus interface device. Data communication is operated by the firmware and drivers. Adapter completely satisfies the needs of the CAN bus with its highest speed of 1Mps and it will be widely used in future for its high efficiency and low cost.
Offset Optimization Method of Arterial Traffic Control
Authors: Lu Bin , Niu Hui Min
Published: October 2011

By analyzing the limitations of existed offset optimization models about arterial control system, and according to the random distribution of road travel speed, we obtain the offset optimization algorithm and optimal signal timing parameters based on multi-attribute decision making methods, where road travel speed, delay and queue length are considered and inequality. Finally, the algorithm is applied to an arterial control system, and the simulation and the analysis of results are given by using Vissim. Results show that the optimized model can provide a new approach for offset optimization of arterial coordinate control system．
Inspection and Test System of the Lighting Inspection Machine
Authors: He Wei Hua , Liu Gui Xi , Chang Peng Ju , Liu Rui , Huang Zeng Jian
Published: October 2011

Currently one of the most important, time-consuming and costly phases of PDP production is the inspection process. The lighting inspection machines play a very important role in this process. The inspection and test system of the lighting inspection machine whether good or not decides the inspection effectiveness. This paper mainly describes the function and design method of every important part of the lighting inspection machine’s inspection and test system.
Switched Controller Design for DC /DC Converter
Authors: Wang Xia , Tang Yu Jun , Wang Jian Li
Published: October 2011

A switched controller is designed for the Boost DC /DC converter. The proposed switched controller takes advantage of both min-projection-controller (MPC) and integral modulated pulse-width controller (IMPWC), in which the MPC deals with the transient process and the IMPWC is in charge of the steady state. Smooth switching is ensured by resetting the integral value of IMPWC according to the static average model and steady output voltage. Simulation results proved the control effect of the switched controller.
Design and Implementation of Real-Time CNC Interpolation ASIC for Pythagorean Hodograph Curve Based on FPGA
Authors: Guo Jing Jie , Tang Wei , Wang Xue Ling
Published: October 2011

In this paper, a novel architecture of a real-time CNC interpolation ASIC for Pythagorean Hodograph curve based on FPGA is proposed. The ASIC built on a single FPGA chip contains a NikosⅡprocessor core. It uses a two-stage interpolation scheme to reduce the computational burden of PH curve interpolation. Firstly, the 1st-stage interpolation program is operated on the NikosⅡprocessor. The FPGA hardware logic performs the 2nd-stage interpolation and outputs two groups of pulses for the motion control of actuators (two stepper motors)
Performance Analysis of CAES Power Plant Energy Storage Sub-System for Wind Power
Authors: Liu Wen Yi , Xu Gang , Yang Yong Ping
Published: October 2011

Compressed Air Energy Storage (CAES) is besides pumped hydropower, the other solution for large energy storage capacity. It can balance fluctuations in supply and demand of electricity. It can meet the challenge of load fluctuations of wind power especially. In CAES technology, air is compressed with a motor/generator using low cost, off-peak or discarded electricity from wind power and stored underground in caverns or porous media. This is called energy storage subsystem. The energy storage subsystem of CAES include: compressing air process and air lose heat process. The equipments of it are organized with different schemes in this paper. Optimization and performance simulation of it are made. The performance data are contrasted.
A Novel Slot-Ring Coupling Antenna with Switchable Polarization
Authors: Gao Shun , Wang An Guo , Pei Jing , Zhao Guo Huang
Published: October 2011

In this paper, a novel slot-ring coupling antenna with reconfigurable circular polarization is presented. The antenna consists of Wilkinson power divider and a slot-ring with perturbations. By controlling the states of the switches, the antenna can achieve right-hand circular polarization (RHCP), left-hand circular polarization (LHCP) in the same direction, respectively. The proposed antenna is designed and simulated using Ansoft HFSS. The measured results of the fabricated antenna are in good agreement with the simulated. Both measured and simulated results of the antenna are presented and discussed.
Design of GPRS Based on MCU STC12C5A60S2
Authors: Long Guang Li
Published: October 2011

The MCU has the smaller volume, low cost, face control, antijamming ability strong and so on merits, GPRS is based on the GSM development foundation in data traffic. one kind of GPRS system Has been designed by using MCU STC12C5A60S2, it including correspondence transformation connection, SIM300 module, MCU, display circuit, keyboard electric circuit, RS232 exterior serial communication connection and so on. The related hardware welding on the PCB, the software programming after-burning writes in the MCU, inserts the liquid crystal display monitor and the SIM card, joins the receiver and the microphone, connects the good GPRS antenna. On the electricity, the establishment correspondence transformation connection, may realize the close-down, the dial and the answering telephone, transmits and receives the SMS, to receive and dispatch E-mail, carries on the Internet to glance over and so on, indicated that has achieved the design requirements.
Multi-Wavelength Fiber Laser Based on a High Finesse Fiber Ring Filter and Multimode FBG
Authors: Pan Hong Gang , Yang Xiu Feng , Yu Jin Long , Tong Zheng Rong , Wei Fang Fang
Published: October 2011

A multi-wavelength fiber laser with a narrow bandwidth based on an erbium-doped fiber ring filter and multimode fiber Bragg grating (MM-FBG) has been proposed, a high finesse fiber ring filter are introduced .The fiber ring filter consists of two optical couplers and a section of weak pumped erbium-doped fiber (EDF）. Thanks to the delay of cavity length and the gain generated by the EDF, the filter has spectral response with a high finesse. The incorporation of the fiber ring filter leads to the suppression of undesirable mode and makes the output laser narrower bandwidth. With 980 nm LD pumped, at the room temperature, the space of the two wavelengths is 0.07nm, which improved the effect of the filter.
A Silicon Capacitive Seismic Accelerometer with a Simple Fabrication Process
Authors: He Qing , Qiao Dong Hai
Published: October 2011

In this paper, a single-crystal silicon capacitive accelerometer is put forward. The accelerometer is composed of a single-crystal silicon vibration head and two backplates, forming a sandwich structure. With damping holes fabricated on backplates, the squeeze-film damping effect is reduced and a Q factor around 0.7 is obtained. This accelerometer has a simple fabricating process including wet and dry etching and ambient pressure packaging. Its tested sensitivity is 22.6pF/g and calculated noise level is lower than 100ng/√Hz, thus meets the demand of seismic applications.
The Application of Particle Swarm Optimization Algorithm in the Production Scheduling Modeling of ERP-Based
Authors: Zheng Jun Jia , Liu Hong Jun , Zeng Shao Yong
Published: October 2011

Job shop scheduling in the production management module is one of the core of ERP system. To solve the problem, that is, to discretely manufacture the multi-process routes and the multi-objective job shop scheduling, this paper propose an optimized algorithm of the improved particle swarm that is used to establish the mathematical model which turns in the direction of the production scheduling system of ERP-based. And with the example of an engineering machinery manufacturing enterprise, it deduces a model’s realization process in the multi-objective shop scheduling in the discrete manufacturing of more complex product structures. It finally gives integration framework of production scheduling system based on the real-time capacity balance, which are based on the particle swarm optimization (PSO) algorithm, and together with the other modules of ERP system. It provides an important practical value for discrete manufacturing enterprises using ERP system to realize scientific and effective production operation management.
A Study on the Acoustic Characteristics of the Counter-Phase Muffler
Authors: Shao Ying Li
Published: October 2011

The exhaust noise, which falls into low-frequency noise, is the dominant noise source of a diesel engines and tractors. The traditional exhaust silencers, which are normally constructed by combination of expansion chamber, and perforated pipe or perforated board, are with high exhaust resistance, but poor noise reduction especially for the low-frequency band noise. For this reason, a new theory of exhaust muffler of diesel engine based on counter-phase counteracts has been proposed. The mathematical model and the corresponding experimental validation for the new exhaust muffler based on this theory were performed.
Two-Colour Mid-Infrared Optical Absorption under Electric Field in an InAs/GaSb-Based Type II and Broken-Gap Quantum Well
Authors: Wei X.F. , Ruan J.F. , Xie C.G. , Yuan H. , Song J.
Published: October 2011

The optical absorptions are calculated in an InAs/GaSb-based type II and broken-gap quantum well under applied electric field. Two absorption peaks were observed through intraband transitions within the same material layer. The absorption induced by the interlayer transition is rather weak due to the small overlap of electron and hole wavefunctions. The optical absorption can be significantly affected by the applied electric field. Our results suggest that InAs/GaSb-based type II and broken-gap QWs can be employed as two-colour photodetectors, which can be controlled by the applied electric field.
Design of Multi-Channel Temperature Acqusition System Based on MSP430
Authors: Dong Li Li , Qin Gang
Published: October 2011

The design of multi-channel temperature acquisition system based on MSP430 and temperature sensor DS18B20 is presented in this paper. The simulation can be realized by using Proteus. The system has the following advantages: the structure of system is specific; the circuit is simple and it’s easy to control. The system can complete the acquisition and display of multi-channel temperature, it also has other functions such as transferring data to PC, etc. The simulation shows that the system is low cost, high reliability and high practical value.
Research on Natural Gas Pipeline Leak Detection Based on Airborne Laser Remote Sensing
Authors: Xu Bin , Lv Xin , Wang Hong Chao , Tan Dong Jie , Chen Ying Jie
Published: October 2011

An airborne technology is proposed to detect in flight over natural gas pipeline with a high spatial resolution the presence of trace of methane on the ground. The principle and the architecture of the airborne laser remote sensing system are presented. Field test experiments are carried out on West-East Natural Gas Pipeline of China, and the results show that airborne detection method is suitable for detecting gas leak of pipeline on plain, desert, hills but unfit for the area with large altitude diversification.
The SMS Backhaul of WSN Monitor System in Landslide
Authors: Cui Zhen Ping , Yan Shu
Published: October 2011

Landslide is one of the most serious natural disasters, forecast and early warnings are important. The SMS backhaul of WSN monitor system is discussed in this paper. After analyzing the transmission system of WSN at present, this paper intend to combine GPRS-Internet, SMS-PP and SMS-CB to pass early warning back to inhabitants, so as to further ensure the reliability and instantaneity. In order to send early warning to every person in landslide zone, several situations are considered. With the real-time monitoring system and extensive early warning backhaul, the damages and losses would be reduced.
A Note on Stability and Instance Optimality in Compressed Sensing
Authors: Zhang Sheng , Ye Pei Xin
Published: October 2011

In this note, it is proved that every -sparse signal vector can be recovered stably from the measurement vector via minimization as soon as the restricted isometry constant of the measurement matrix is smaller than . Note that our results contain the case of noisy data, therefore previous known results in the literature are extent and improved. Also we obtain the results on the stability and instance optimality for some random measurement matrices.
Vibration Analysis of a Micromachined Modal Gyroscope Based on Elastic Body
Authors: Wang Zheng , Wu Xiao Sheng , Hu Xiao Jun , Chen Wen Yuan , Zhang Wei Ping
Published: October 2011

Micromachined modal gyroscope based on elastic body (MMGEB) is a novel kind of rotating rate sensor, which has large stiffness and robust resistance to shake and strike because there is no evident mass-spring component in its structure. In this paper, the model and working mechanism of MMGEB are proposed first. The modal analysis, the harmonic analysis and Coriolis analysis for the model by the finite element method (FEM) have been conducted. The research in the paper provides theoretical foundation for realizing this micromachined gyroscope.