bluuebunny/crossref_metadata_2025 huggingface dataset:
An Efficient Semidefinite Relaxation Method for Energy-Based Source Localization in Sensor Networks
Authors: Ai Wen Bao , Deng Hui Jun , Yuan Jian Hua
Published: June 2013

This paper addresses the energy-based localization problem in wireless sensor networks. Since the objective function of the weighted least squares (WLS) formulation is nonconvex, its global solution is hard to obtain without a good initial estimate. In this paper, An approximate solution to the (WLS) problem is presented, by relaxing the minimization problem into semidefinite programming form. One can obtain an optimal solution of the (SDP) by rank-one decomposition of matrices. Numerical results show that the proposed method is indeed efficient.
Study of Data Fusion Mechanism Based on the WSN
Authors: Liu Wei , Du Qin Sheng , Wang Le Le
Published: June 2013

Wireless sensor networks integrated four technologies including sensor, embedded computing, network technology and wireless communication. It is a new type of non-infrastructure wireless network. In this paper, a data fusion method has been brought forward based on wireless sensor networks, and through an algorithm simulation test, It is proved that the algorithm is effective to reduce the energy consumption of the network, and extend the lifetime of the network.
Random Vibration Properties of High-Speed Railway Vehicle Considering Random Parameters of Track Structure
Authors: Li Bin , Liu Xue Yi
Published: June 2013

Applied theory of vehicle/track coupled dynamic, random vibration properties of high-speed railway vehicles are researched in random parameters of fastener and ballast stiffness obeyed normal distribution and track irregularity combined the sample of artificial shortwave and the sample of low disturbance irregularity of high-speed railway in German with train speed increase. The results show that dynamic interaction of vehicle/track system and vibration responses of railway vehicle are increased with train speed increase, but the increase of wheel-set acceleration is much more. The parameters of high speed railway track structure (especially fastener and ballast stiffness) had much more impact to random vibration responses of vehicle/track system, so they should be optimized and remained in a narrow range.
The Study of Luminous Flux Method for Rapid Measurement of Micro-Aperture Area
Authors: Ye Ming , Xu Dong Jing , Ni Zhi Qiang
Published: June 2013

This paper presents a new method for micro-aperture measurement based on luminous flux. The principle and the structure of micro-aperture measurement system are introduced in detail. Compared with previous measurement methods, the proposed method has several advantages: The measuring head with array line structure can measure several apertures’ area directly at the same time. The shape of the aperture is not limited to a circle or any other shape. It is a measuring technique with high precision and low cost. The test results show that the uncertainty is mm of a circular 0.5 mm diameter aperture, and the average linearity value is 3.47% to the aperture which diameter in the range from 150 to 500um.
Azimuths Scan Servo System Design of the Radar
Authors: Yu Bi Qiong
Published: June 2013

For the special requirements of the radar antenna, a servo system was designed to drive a certain type of weather radar azimuth scan. The control segment consists of the PC and the stepper motor motion control card, in which the stepper motor was used as the actuator and the motor drive circuit was built by the specific integrated driver chips of the stepper motor. By testing the vibration, the shock and the temperature of system, it shows that the designed azimuths scan servo system can meet the requirements of the weather radar azimuth scan.
Study on Motion Measurement of Human Upper Limb Based on Electromagnetic Tracking System during the Activities of Daily Living
Authors: Song Hai Yan , Zhang Jian Guo , Wang Fang
Published: June 2013

The measurement and analysis of human motion during the Activities of Daily Living (ADLs) is widely used in rehabilitation, ergonomics, diagnosis, and bionics etc. By using American PolhemusTMelectromagnetic tracking system, the human upper limb motions of 6 objects performing 12 basic actions of ADLs were measured. Then the joint angle ranges of human upper limb were obtained by upper limb motion analysis system developed by ourselves. The results can provide reference for complete, standardized Chinese adult human upper limb kinematics parameters.
Experimental Study on the Relationship between Tongue Temperature and the Lingual Circulatory System
Authors: Xie Hai Wei , Zhang Yan
Published: June 2013

To study the relationship between tongue temperature and the lingual circulatory system, the blood stasis and blood deficiency syndrome of traditional Chinese medicine (TCM) syndromes were researched by making animal model and vascular cast experiment. The influence of blood stasis and blood deficiency syndrome on tongue temperature and the lingual circulatory system were studied and analyzed. The experimental results indicated that the lingual circulatory system of blood stasis syndrome and that of blood deficiency syndrome were distinctly different in blood flow rate, vascular diameters and the density of small vessel. These differences in circulatory system could induce a change on lingual temperature. This result proves that the tongue temperature has relations with the change of lingual circulatory system.
Electroencephalagram Analysis in the State of Attention
Authors: Zhao Jun Chang , Zheng Zheng Zhong , Huang Xiao Lin , Wang Jun
Published: June 2013

Assessment the distinction of different brain working conditions is very important for brain function study. For the first time, detrended cross-correlation analysis (DCCA) was applied to analyze different brain working conditions. It were compared the difference of DCCA values for EEG signals under count number state and close eyes state. It was found that the DCCA values of count number state EEG signals decreased compared with close eyes state EEG signals which can be helpful for studying different brain state.
The Research on Hardware Design for the Automatic Verification System of Late-Model Fuel Dispensers
Authors: Jun Lin
Published: June 2013

According to the requirement of JJG443-2006 ,the solution of hardware design of late-model fuel dispensers automatic verification system is introduced in this paper, which makes use of four wire PT resistance and AD7712 as the acquisition circuit for getting temperature of oil tank and oil gun. In order to achieve the automatic verification of fuel dispensers, it also designs the measuring circuit for the flow rate of oil gun based on AD620 chip and the automatic camera module driven by stepper motor.
The Application of Radar Oil Spill Monitoring System in the Management of Marine
Authors: Qu Liang , Zheng Lin , Bu Zhi Guo , Wang Juan , Zhang Ting
Published: June 2013

For the characteristics of all-weather monitoring and high accuracy, X-band radar develops into the new technical means of monitoring marine oil spill. This paper presents the principle, workflow and components of radar oil spill monitoring system, as well as its application in marine management and its development trend.
Gas Concentration Monitoring System Based on Soft Redundancy and ZigBee
Authors: Huang Bo , Liu Kang , Zhang Liang Dong
Published: June 2013

The scheme based on soft redundancy and ZigBee is introduced due to the inadequacy of existing mine gas concentration monitoring system. The system is divided into underground and aerial parts. The gas concentration of mine working site can be tested automatically by underground part, which can transmit the data to the ground using ZigBee wireless communications technology. Two sets of identically configured PLC control system constitute the aerial part, which can meet redundancy requirements by procedures and directives. The solid technical support in mine safe operation can be provided based on the system, which improves the stability and reliability of the gas concentration monitoring.
Application of Wireless Sensor Networks on Power Plants Monitoring
Authors: Huang Shou Zhi , Zhao Xue Zeng
Published: June 2013

The traditional wired monitoring system for power plants is complex and hard to detect when the system faces some problems. The idea of monitoring the environment of power plants wirelessly is proposed to solve this problem. The feasibility of applying wireless sensor networks to power plants monitoring is analyzed. Then a wireless monitoring system based on XBee modules which are using ZigBee technology is designed. The temperature and electrical current data are gathered by sensors attached to the XBee modules and transferred to the PC controller through mesh network. An interface between coordinator and controller is designed utilized LABVIEW software to read data and send commands. In the end, a three nodes demo system is built up to testify the design.
Factors Influencing the Performance of Porous Wind Shields
Authors: Xu Yi Zhong , Virk Muhammad S. , Knight Jason , Mustafa Mohamad Y. , Haritos G.
Published: June 2013

Porosity, porosity distribution, porous shape, porous size, thickness of shield, shield height &width, and shield orientation are the factors that influence the performance of porous wind shields. Among them, porosity is the most important factor in determining the performance of porous shields. However shield height & width have major impacts on the performance of shields. The remaining factors play less significant influences on the performance of the shield, but they remain researching interests to be further studied.
Simulation and Analysis on the Best Range of Lift-Off Values in MFL Testing
Authors: Wu De Hui , Zhang Zhong Yuan , Liu Zhen Liang , Xia Xiao Hao
Published: June 2013

As a nondestructive testing method, the magnetic flux leakage (MFL) testing technique is widely used for the testing of surface and near-surface areas in ferromagnetic materials. The MFL field is influenced by parameters of defects, strength of excitation, sensor lift-off value and electromagnetic noises etc. A 2-D finite element method (FEM) simulation model is established in this paper to analyze the influence of lift-off values under the condition of mechanical vibration and electromagnetic noises. The distribution of the MFL field peak for different lift-off values and different depth defects is presented. The defect quantization errors caused by the mechanical vibration and electromagnetic noises are introduced to analyze the influence of lift-off values and electromagnetic noises. The best range of lift-off values can be determined from the results of error analysis. It is effective to improve the measuring accuracy in practical MFL testing.
A TOA Location Method Using ROS Scattering Model in NLOS Environment
Authors: Xie Li Ying , Ruan Jin Xin
Published: June 2013

In most cellular propagation environments, a LOS propagation path does not exist to all of the BSs that participate in locating a target MS. The signal received by the receiver is a multipath and interference mixed signal, which is NLOS signal. In NLOS conditions, the traditional location algorithms perform poorly. Therefore, a scattering-model-based location method for cellular network was proposed in this paper. Based on the Ring of Scatters (ROS) model, with the use of the mean value of the TOA measurements, the method mitigated the effects of NLOS.
CPN-Based Modeling and Analysis of Shared Multi-Channel Cache CMP Architecture
Authors: Tian Xiao Qing , Liu Cai Xia , Wei Feng Qi
Published: June 2013

As a formal modeling and analysis method, colored petri nets (CPN) fits to construct formal model for software/hardware system with lots of communication and parallel/synchronous sharing behavior. Then behavior analysis of system function and performance based on the CPN model can be unfolded to verify the system feasibility. The CPN model of a kind of new CMP architecture shared multi-channel L2 Cache (AUMCC) is constructed in this article. Processing simulating of instruction set is deeply penetrated on the AUMCC CPN model, and analysis based on simulating results well verifies the feasibility of AUMCC architecture.
Adaptive Projective Synchronization of the New Three-Dimensional Chaotic System
Authors: Huang Su Hai
Published: June 2013

This paper deals with the finite-time chaos synchronization of the new chaotic system [with uncertain parameters. Based on the finite-time stability theory and adaptive technique, a controller has been designed to realize finite-time chaos projective synchronization and parameter identification. Moreover, numerical simulation result is included to demonstrate the effectiveness and feasibility of the proposed synchronization scheme.
Design of Moving System for Pico-Satellite Deployer
Authors: Zheng Jun Hua , Wu Chang Ju
Published: June 2013

Pico-satellite’s potential use is increasingly gaining nation’s recognition. Because of its small volume and light weight, it is necessary to develop the special deployer. The key technologies of Zhejiang University Pico-Satellite Deployer (ZDPSD) are, cutter unlocking the door, conical spring driving the pico-satellite, oriented rail restricting the direction and locking shaft fixing the door. In September 2010, the two pico-satellites were launched and deployed successfully at the predetermined orbit. The paper includes designing and analyzing of the moving system, mode analyzing of the deployer and the experiments on ground and in-orbit. The key process of the development is summarized, which can be regarded as reference for the further developing.
A Novel Spherical Parallel Manipulator with Circular Guide
Authors: Fang Hai Rong , Chen Zhi Hong , Fang Yue Fa
Published: June 2013

In this paper, a novel 3-degree-of-freedom (DOF) parallel manipulator that can perform three rotations around the remote centre is presented. The theory of screws and reciprocal screws is employed for the analysis of the geometric conditions. In particular, using circular guide to instead of R joints, so that has the advantage of enabling continuous 360° revolute around Z-axis. The inverse kinematics of mechanism is given and the workspace has a good performance. To compare with the machine constructed with traditional joints, it has the advantage of high rigidity and precision.
Screening for the Strain Galactomyces sp. Producing Bioflocculant by UV Mutagenesis
Authors: Wan Ying Xin , Shi Lei , Wu Li Ping , Tang Pei Jing
Published: June 2013

Strain Galactomyces sp. M-2 from activated sludge was used as parent strain and then UV mutation breeding was performed. Finally we obtained a quality strain UVM8 suitable for the production of bioflocculant which flocculating activity is 92.8%. It showed there is excellent stable flocculating activity for stain UVM8 in the flocculating stability experiment. Further studies showed the best flocculation effect was obtained when C/N ration is 20:2 and pH is 8 in the initial culture medium.
The Key Predistribution Mechanism for Wireless Sensor Networks
Authors: Shi Fa Ming , Hu Zhi Hua
Published: June 2013

For symmetric key-based key distribution techniques will not completely solve the security problem of key distribution in wireless sensor networks, a public key with certificate-based key pre-distribution scheme, the base station using a series of original public key and a single collection to the hash function to produce a public key, and for each node were randomly assigned to a subset of public and private key and public key set. Private key only, the program can not only improve the safety performance of the network, but also improve the storage overhead of the network. The program compared with the traditional key pre-distribution scheme, both to ensure the security of the network, both network and node resources are limited practical under the premise of constant connectivity, network security and network scalability margin to improve.
Indoor Wireless Positioning Utilizing WSN and Machine Vision
Authors: Wang Zeng Yu , Xu Yuan , Li Qing Hua
Published: June 2013

It is a challenging issue to develop optimal real-time target tracking methods for automobile in the small areas such as urban and indoor environments. In order to get comprehensive navigation information, a target tracking system utilizing ultrasound and machine vision is proposed. In this system, the position, velocity and the yaw in the relative coordinate are used as the state variables, the ultrasound is used to measure the distance between the reference node and the blind node, and the yaw of the automobile is measured by the machine vision. Then, the extended Kalman filter is used to fuse the information measured from local estimators in the proposed method. Simulations show that the position error of the proposed approach is about 0.2m and the velocity error of the proposed approach is about 0.1 m/s.
RETRACTED: Deploying Robots and Online Algorithms
Authors: Sun Peng , Zhao Teng
Published: June 2013

Retracted paper: The improvement of 802.11 mesh networks is a robust quagmire. In this work, we show the construction of link-level acknowledgements. In order to answer this grand challenge, we use linear-time epistemologies to disconfirm that 802.11 mesh networks and architecture can collaborate to fix this riddle.
Human Upper Limb Robotic System Experimental Analysis by Using CONTEMPLAS Motion Software
Authors: Copiluși Cristian , Grecu Valentin , Dumitru Nicolae
Published: June 2013

In this paper a human upper limb robotic system is analyzed through an experimental study. The experimental analysis aim is to validate this robotic system type in order to use it in some kinetotherapy programs for the human upper limb recovery. The robotic system experimental research was performed by using special equipment called CONTEMPLAS which enables to evaluate angular variations in 3D environment. The equipment used in this research has two high-speed cameras which can record and establish the angular variations developed at the robotic system joints level. This paper consists of three main parts. In the first part there is an actual study of the robotic systems specially designed for the human upper limb rehabilitation, where the robotic system proposed for this experimental research is described. The second part includes some literature aspects regarding the movements developed by the human upper limb, and in the third part the experimental research is described in detail.
Research and Implement of a Robot Networking Method Based on Jini Techniques
Authors: Wang Mei
Published: June 2013

The principle of Jini technology is introduced briefly first. The approach of introducing Jini technology into robot networking is presented and corresponding design is given out. Protocols used in Jini Network to perform robot remote manipulation were analyzed. Several main technologies for the implementation of Jini-based robot networking, including the usage of Jini Technology Starter Kit were discussed in detail. In the end, taking improved Siasun robot as an example, an implement method of the design scheme is described and the validity of the approach is shown by experiments.
Model Research of Supercritical CO2 Extraction Tillering Onion Essential Oil Based on Differential Mass Conservation Equation and BP Neural Network
Authors: Lin Xiao Mei , Zhang Li Sheng , Tian Ye
Published: June 2013

According to supercritical CO2 Extraction and characteristics of tiller onion crush the processing, we have established a differential mass conservation model, Extraction rate was accurately obtained in the differential mass conservation model based on the characteristics of the BP neural network. Through further training, we got the network training and simulation figures. Finally, the differential mass conservation model was solved.
A Control Device for Distribution Transformer Neutral Current and Loss
Authors: Liu Dong , Liu Yong , Zhao Kuo , Guo Min Yi , Zhao Hui , Zhang Zhan Long
Published: June 2013

This paper develops a control device for distribution transformer neutral current and loss caused by unbalanced loads. Due to multi-objective optimization, its control strategy is designed, considering the reliable operation of distribution transformers and its performance. This device can gather power quality parameters, calculate the optimal regulation and control capacitor switching, which consists of power quality acquisition unit, central processing unit (CPU), capacitor control cabinet and power supply. After simulation and experiment, the result shows device can achieve target by dynamic adjustment.
A Remote Intelligent Control System for Split Air Conditioning System
Authors: Ding Jie Ming , Li Zhen Zhong , Li Wei Bo , He Pin , He Yang
Published: June 2013

Combined wireless sensor network technology (WSN) and infrared control technology this paper designs an intelligent control system for split air conditioner (ACSS). The system adopts the SimpliciTI protocol and a highly integrated chipset, CC1110, as wireless sensing node, which it has high efficiency and lower power. The intelligent remote control unit of the system is capable of signal conversion, wireless communication as well as infrared control ability. In order to suit different air conditioners, the system establishes a control code library by learning a variety of air-conditioning infrared control signals. The control parameters optimized by the system server are transmitted to the intelligent terminal and then fires the infrared control signal to the air conditioner. Therefore, the system achieves the purpose of the remote intelligent controlling.
PID Parameters Tuning of Proportional Directional Valve Based on Multiple Orthogonal Experiments Method: Method and Experiments
Authors: Jin Bo , Zhu Ya Guang , Li Wei
Published: June 2013

This paper presents a method to tune the PID parameters of controller for proportional directional valve without modeling and priori knowledge of the system. The optimization of the PID parameters is achieved through statistic analysis by using the proposed method. The principle and the implement of the method is explicitly introduced first. Then, the experiment is executed, and Ziegler-Nichols method is also applied in PID tuning for comparison. The results show that the presented method performs better and is proved to be effective. And the method is also straightforward to carry out.
Unfragile Passive Control of Uncertain Sampling System
Authors: Liu Qing Zhi
Published: June 2013

The unfragile passive control problem of a class of uncertain state-delay sampling system is discussed. Applying Lyapunov method, and combining the properties of matrix inequality, the sufficient condition of robust stability is given, and the unfragile passive controller is designed. Finally a numerical example illustrates the effectiveness and the availability for the design.
Index Terms - Uncertain State-delay Sampling System , Linear Matrix Inequility , Unfragile Passive Control .
Nonlinear Control Law Design for Lateral Aircraft Dynamics at High Angles of Attack
Authors: Ene Costin
Published: June 2013

In this paper, an adaptive backstepping type design is proposed to control the complex nonlinear behavior of the wing rock phenomenon. This method, based on Lyapunov stability theory, can simultaneouslyachieve parameters identification and control.Finally numerical simulations are presented to justify the effectiveness of the proposed controller.
Fault Tolerant Stabilizing Controller for a Quadrotor UAV
Authors: Adîr Victor G. , Stoica Adrian M.
Published: June 2013

Quadrotors are becoming very popular because of their potential to be applied in a large variety of missions. In order to increase their reliability when actuator faults are present a fault tolerant stabilizing controller is designed. The presented approach can handle multiple actuator faults without needing to identify them. The effectiveness of the controller is demonstrated by carrying out numerical simulations.
DC Capacitor Voltage Balancing Control for Cascaded STATCOM
Authors: Li Sheng Qing , Xu Wen Xiang , Li Wei Zhou , Zeng Huan Yue
Published: June 2013

Through the DC side capacitor voltage unbalance problem of cascaded static synchronous compensator. Put through a theory of active voltage average distribution to balance DC capacitor voltage, using master slave controller to realize controlling requirements. The main controller calculates each phase AC side of H bridge required total active and reactive voltage and grid voltage phase information etc, The slave controller complete each cascade module for active voltage average distribution control. The simulation results show that the method is feasible and effective.
A Study on Variable Frequency Control of Precooling Pump Motors
Authors: Jin Xing , Jiang Chang Hong , Li Xiang Guang
Published: June 2013

Based on the energy-saving principle of variable frequency and energy adjustment, problems on application of the optimization table method of voltage vector in AC frequency control of motor speed adjusting are mainly emphasized by analysis on precooling system of air separation in this paper. With the help of Matlab/Simulink simulation software, the simulation model of the control system of the AC induction motor is built, and a method of frequency and speed adjusting control of the motor based on dsPIC is put forward. Furthermore, this technology is applied in the precooling pump system of air separation, and a full digital SPWM variable frequency and speed adjusting system with low energy consumption, high efficiency and good dynamic is constructed.
Asymptotic Backstepping Stabilization of SISO Nonlinear DAE Subsystems Using Artificial Neural Networks
Authors: Zang Qiang , Zhou Ying
Published: June 2013

The problem of robust stabilization for a class of SISO uncertain nonlinear Differential-Algebraic Eqyatuion subsystems is considered in this paper. The robust stabilization controller is proposed based on backstepping approach using two-layer Artificial Neural Networks (ANN) whose weights are updated on-line. A new adaptive algorithm is proposed to update the weights of ANN such that all signals in the closed-loop systems are bounded and the states are convergent asymptotically to the equilibrium through the proposed controller.
Accurate Pressure Management of Parallel Choke Manifold
Authors: Zhu Zhong Xi , Liu Ying Biao , Wang Zhao Fei
Published: June 2013

The conventional valves used in the choke manifold for well control usually have intensely nonlinear characteristic of the match between pressure choking and vale opening. Therefore, it is difficult to achieve the precise choking pressure that is essential to the managed pressure drilling (MPD) through a single throttle within the scope of full opening. However, the parallel choke manifold proposed in this paper, i.e. a program of parallel throttling, can enhance the accurate choking wellhead backpressure for MPD. The fine linear choking principle and feasibility of the parallel choke manifold were analyzed in detail by calculating the resistance modulus of bypass valves. The formula calculated the resistance modulus of each valve under different working state. Furthermore, the laboratory tests shown the parallel throttle method can achieve the control of fine choking pressure by switching one or more valves in the branch pipes. Therefore, the proposed parallel choke manifold system can reduce the requirements for the linear capability of valves and provide some references to further study the surface fine choking pressure system for MPD.
The Utility Model of Early Warning System for Train Operation
Authors: Yi Shi
Published: June 2013

The utility model of early warning system for train operation detects and analysis all the information from the weather detection, photoelectric detection, vibration sensor and signal of the tracks comprehensively. It determines the position of the train by the weighted coefficients and controls the interval signal and locomotive signal accurately. This system should be barely affected by the weather conditions, the results detected by this system are reliable, and it can ensure the train operates safely.
Pilot-Induced Oscillations Prevention Using Anti-Windup Compensation in the Presence of Time-Delay
Authors: Pană Valentin
Published: June 2013

The paper presents a compensator design technique for systems with saturating actuators in order to recover as much as possible the performance of the unsaturated case. This anti-windup scheme is obtained using H-infinity optimization methodology. The proposed design approach allows to obtain a anti-windup controller that accounts for time-delays in the control system. Comparative result are presented for the two design methods and time simulation of the nonlinear system are used to analyze the performances of both designs. A reduced order anti-windup controller procedure is also investigated.
Keywords: PIO, anti-windup, rate saturation, compensator.
A Vision Detection Algorithm for LIGA Part Assembly
Authors: Gao Jun , Ye Xin , Zhang Zhi Jing , Tang Yong Long , Jin Xin
Published: June 2013

This paper proposes a vision detection algorithm to acquire LIGA part’s edges based on an in-house multi-DOF manipulator for LIGA part assembly. Feature recognition based on maximum information entropy is proposed to solve the problem that high precision edge recognition under backlight source. In order to further improve vision recognition accuracy, edge feature recognition algorithm based on symmetrical edge is proposed to recognize the center line of the symmetrical parts when the quality of the image is poor.
LS_SVM Based on DTW and Sliding Window Pruning Algorithm and its Application
Authors: Sun Xin , Gao Xue Jin
Published: June 2013

Compared with the traditional SVM, LS_SVM improves the speed of the large sample study,however ,LS_SVM loses its sparsity, which is an advantage of the the traditional SVM . For LS_SVM,almost all of the samples are support vectors .When a new sample added all samples are re-involved in the calculation, and that greatly increases the amount of the computation. In response to these issues,this paper presents an algorithm called the LSSVM sliding window pruning algorithm,which is based on DTW. With the combination of local modeling ,the algorithm selects the most similar samples with the current sample point in the process of the establishment of the on-line model of the batch process as the training samples .It can remove those samples that are relatively ineffective,which can restore LSSVM 's sparsity.Taking the cell concentration in the fermentation process of E. Coli for example, this paper proves that the method can establish a more accurate on-line prediction model in the case of a smaller number of samples . Compared with the off-line LSSVM ,the on-line model has a higher accuracy and a better dynamic adaptability.
Recovery of Copper from Flotation Tailings by Leaching
Authors: Liu Dan , Wen Shu Ming , Xian Yong Jun , Shen Hai Ying , Deng Jiu Shuai , Wu Dan Dan
Published: June 2013

A technology route of Reverse flotation of acid-consuming gangue mineralsAcid leaching for copperExtractingElectrodepositing is proposed for recovery copper from a tailings with high content of calcium oxide and magnesium oxide and high content of combined copper oxide. The effect of H2SO4 concentration, leaching time and stirring speed on copper leaching was investigated. The leaching solution obtained under the optimal copper leaching conditions, was used to be proceeded for extracting and electrodepositing test. The best leaching conditions are stirring speed of 30 m/min, H2SO4 concentration of 150 Kg/t ore, leaching time of 30 minutes. Under the best conditions, the acid leaching test presented that the production of per ton copper consumes sulfuric acid of 17.31 t, and Cu leaching rate is 84.70%.
Analysis of NMPC Algorithm Based on Reduced Precision Solution Criteria
Authors: Wan Jiao Na , Zhang Ju Wen , Wang Zhi Qiang , Zhang Tie Jun , Wang Ke Xin
Published: June 2013

This paper studies the stability of nonlinear model predictive control (NMPC) based on sub-optimal solution obtained under reduced precision solution (RPS) criteria. NMPC needs to solve the optimal control problem (OCP) quickly and the input is injected into the controlled plant in time. Traditional convergence criteria in optimization algorithms usually cost excessive long computation time with little improvement of solution, which results in degradation of control performance eventually. RPS criteria are new convergence criteria for deciding whether the current iterate is good enough and whether the optimization procedure should be terminated. It can terminate the optimization process timely. This work gives the proof of the rps-NMPCs property. Simulations are done to analyze the effect of disturbance, especially when computational delay exists, on the closed-loop system controlled by rps-NMPC, and demonstrate that the algorithm owns good stability when disturbance exists.
Estimating Strength of Concrete Using a Genetic Algorithm Combining Operation Tree (GAOT)
Authors: Chen Kuan Ting , Chen Li , Fu You Rong , Chen Sing Han
Published: June 2013

The main purpose of this paper is to propose an incorporating a genetic algorithm (GA) into the Operation Tree (OT), called GAOT, and apply it to estimate the compressive strength of high-performance concrete (HPC). A large number of experimental data were used to compare accuracies of the model building technique. The results show that this novel model, GAOT, can obtain highly nonlinear mathematical equations with low estimating errors for predicting the compressive strength of HPC.
Acoustic Emission Activity Detector for Crack Location in Steel Structures
Authors: Li Li , Li Ji , Yu Xin Liang
Published: June 2013

In acoustic emission (AE) testing for steel structures, location of AE source is an important problem because the source is often related to micro-structure change or defects. In the paper, an activity detector was proposed to locate AE sources based on clustering analysis and AE statistical parameters. Firstly, a location plane, which may contain AE sources, was obtained by the technique of time difference of arrival (TDOA). And the plane was divided into some sub-planes base on clustering analysis. Then, the activity detector was established based on two AE statistical parameters of energy counts and ring-down counts. Finally, the detector value in each sub-plane was calculated and the sub-plane with the maximum value was identified the position of AE sources. Further, by applying the method to test crack sources in a steel structure experiment, the crack position was located correctly compared with actual crack sources. The results demonstrated that the method based on the AE activity detector can reduce ambiguity and locate AE sources accurately and effectively.
3D vs. 2D Modeling of Concrete Gravity Dam Subjected to Mining Tremor
Authors: Dulinska Joanna
Published: June 2013

The paper indicates the role of 3D modeling of concrete gravity dams in evaluation of dynamic response of dams to mining tremors which occur in mining activity regions. 2D and 3D models of a concrete gravity dam were prepared in order to compare two-and three-dimensional analysis of the dynamic response of dam to mining shock. Firstly, values of natural frequencies obtained for 2D and 3D models occurred to be very similar, but only the 3D model allowed to predict the dam behaviour under longitudinal kinematic excitation. Secondly, the comparison of the maximal principal stresses obtained for 2D and 3D models indicates that the simplified 2D analysis underestimates the values of dynamic response on about 20 %. Three-dimensional dynamic analysis allows to assess internal stresses resulting from mining shock more precisely, since the amplitudes of ground vibrations during mining tremors are comparable in three directions.
A Safety Evaluation Model of Large Space Building Based on AHP Algorithm
Authors: Sun Hui Ying , Wang Jia , Xiao Ze Nan
Published: June 2013

This paper puts forward a safety evaluation model of large space building based on AHP (Analytical Hierarchy Process) algorithm. It is for the purpose of the electrical equipments zone control when on fire. This will make some safe areas in large buildings be able to use normal illumination and the elevators for personnel evacuation.
A Microscopic Study of Before-Arc Process in Metal Vapor Plasmas Proximal Cathode Region. Part I Formation of the Proximal Cathode Region
Authors: Li Jing , Yu Qiu Ting , Cao Yun Dong , Liu Xiao Ming , Xu Chong
Published: June 2013

Metal vapor arc in vacuum breaker is a very complex phenomena and the researches on the process of arc creating are the effective method to improve breaking ability. By the theoretical study and numerical simulation, exploring the formation of plasma sheath near the cathode, charged particles energy distribution and influence elements in before-arc process are the fundamentals of this paper. Before-arc process is the fundermental of arc energy and the proximal cathode region is the important area for vacuum arc forming, so before-arc process of metal vapor arc was simulated here. The modification to electron motion produced by the interaction between charged particles and plane electrodes and both elastic and charge exchange collisions between electrons and neutral gases were considered here. The copper cross section adopted here was related to the particle energy. The tracks of electrons were traced until they reached to the anode surface. Based on this method, the formation of proximal cathode region and some microscopic parameters were simulated here. The results show that the collision between charged particles with the electrodes is the necessary condition in proximal cathode regions formation.
A Microscopic Study of Before-Arc Process in Metal Vapor Plasma's Proximal Cathode Region. Part II the Influence of Macroscopic Parameters on the Proximal Cathode Region
Authors: Li Jing , Yu Qiu Ting , Cao Yun Dong , Liu Xiao Ming , Xu Chong
Published: June 2013

The moment of vacuum breaker contacts opening to arc creating process is an unbalanced gaseous breakdown process. This before-arc process is the foundation of studying arc process. The mechanism of the metal vapor arc is different from other gas medium and contains complex electrode process. The proximal cathode region is the important area for vacuum arc forming and it is affected by many factors. The influences of the different electrode separations, different secondary emission coefficient on electronic density, electronic temperature and electric potential, were analysed in this paper. The simulation results show that the change of electrode separations barely impacts the thickness of sheath and the decrease of electrode separations will lead to the decrease of electronic energy near the cathode sheath. The increase of secondary electron emission will increase charged particles energy, which is the important condition of forming cathode sheath.
Research on the Mechanism of Tectonic Stress Field Evolution for Coal and Gas Outburst
Authors: Song Wei Hua , Zhang Hong Wei
Published: June 2013

The geological characteristics of Pingdingshan mining area in China is fault block uplift and the depression in all around. The faults in the region are dominated by NW trending faults. Our researches show that most of faults experience different mechanics process and movement character because of the evolution of tectonic stress field. The regional distribution of coal and gas outburst is consequent on the regional distribution of regional tectonic stress, tectonic coal and gas storage. At the action of SW-NE extrusion stress by the effect of Qinling orogeny belt, the NWW strike structure and the NNE composite tectonics are prone to occur coal and gas outburst because of concentrated stress, low penetrability and good gas storage condition. Also incorporated with in situ stress measurements and the numerical simulation of regional tectonic stress field by using self-developed Rock Mass Stress-state Analysis System software, the mechanism of the tectonic stress field on coal and gas outbursts is analyzed. The results indicate that the distribution of rock stress depends upon the faults and is formed again because of superposition of the action of faults. Tectonic stress field and its uneven distribution provide dynamic conditions for the occurrence of coal and gas outbursts.
Experimental Investigation on Surface/Subsurface Damage in Rotary Ultrasonic Machining of Glass BK7
Authors: Huang Yan Hua , Lv Dong Xi , Tang Yong Jian , Wang Hong Xiang , Zhang Hai Jun
Published: June 2013

Experiments were carried out to study the effect of ultrasonic vibration on the surface roughness and subsurface damage (SSD) in rotary ultrasonic machining (RUM) of glass BK7. As a comparison, some conventional grinding (CG) experiments were also performed under the same process parameters with there of the RUM ones. The surface roughness of the RUM/CG samples was measured with a surface profilometer. The SSD of these specimens was assessed and characterized by a measuring microscope with the help of the taper polishing method. Also, the influence of process parameters (cutting depth, feed speed, and spindle speed) on the surface/subsurface quality was discussed. As a result, both the surface roughness and the SSD depth of the RUM/CG specimens were reduced with the increased spindle speed, while increased with the increasing of feed speed and cutting depth of the diamond tool. Compared with the CG process, the introduction of ultrasonic vibration resulted in the higher surface roughness and SSD depth, due to the fact that the max cutting depth of the abrasive in the RUM process increased by an amplitude compared with that in the CG process.
Numerical Analysis Method of Coke Pusher Ram Based on ANSYS
Authors: Wang Jian Xin , Zhao Guo Qi
Published: June 2013

This article describes a numerical analysis method based on ANSYS used to simulate the whole working process of coke pusher ram. Works have done included the following aspects: the coke pushing resistance curve has been determined; the basic ideas and methods which can treat contact problem, moving loads and other problems in the ANSYS have been introduced, provides a reference for the solution of similar problems.
A Novel Intelligent Turn-Milling Machine for Processing Huge Workpiece
Authors: Chen Zhi Hong , Fang Hai Rong , Fang Yue Fa
Published: June 2013

This paper presents a novel intelligent turn-milling machine, which processes the plastic material on the surface of huge cylindrical aluminum tank equal-thickness. The workpiece is too huge and cannot be processed by traditional lathe for turning operation. In order to make the plastics smooth and equal-thickness, the distance between the cutter and the surface of the tank is kept constant according to the feedback of position sensor placed before the cutter. Via the position sensor, the data of the workpiece shape can be obtained real-timely and the cutter feeding can be controlled by NC system to trace along the workpiece parts figure intelligently. Finally, experimental results verify the effectiveness of the processing method.
Experimental Analysis of Hole Making in GFRP Composite Using Abrasive Water Jet Cutting Technology
Authors: Ibraheem Hussein Mohammed , Iqbal Asif , Hashemipour Majid
Published: June 2013

Machining of composite materials for the production of bolt holes is essential in the assembly of the structural frames of many industrial applications of GFRP. Abrasive water jet cutting technology has been used in industry for such purposes. This technology has procured many overlapping applications and as the life of the joint in the assemble structure can be critically affected by the quality of the holes, it is thus important for the industry to understand the application of abrasive water jet cutting process on GFRP composite materials. The aim of the present work is to to assess the influence of abrasive water jet machining parameters on hole making process of woven laminated GFRP material. Statistical approach was used to understand the effects of the predicted variables on the response variables. Analysis of variance (ANOVA) was performed to isolate the effects of the parameters affecting the hole making in abrasive water jet. The result shows that cutting feed, water jet pressure, standoff distance and abrasive flow rate are influential parameters upon the response variables of the abrasive water jet cutting process of GFRP composite, type 3240.
The Performance Analysis of Single Water Droplet Evaporative Supercooled Process for Ice Slurry Production
Authors: Yan Jun Hai , Zhang Xiao Song
Published: June 2013

To analyze evaporative supercooled process of single water droplet in the air with low temperature and low humidity ratio, a mathematical model was constructed to simulate the evaporative process of single water droplet. The droplet temperature during its evaporation process and the influence of different initial droplet diameter, initial water temperature, air temperature and air humidity ratio were analyzed. The evaporative process of droplet in supercooled stage was simulated through the mathematical model, results from modeling basically tallies with the experiment. The numerical results show that lower initial temperature of water droplet can lessen the supercooled time of reaching steady state evaporation stage. Additionally it can not only lessen the supercooled time but also acquire lower supercooled temperature of water droplet by reducing air humidity ratio or lowering air temperature. Furthermore, the smaller initial diameter of water droplet is, the shorter supercooled time of reaching steady state evaporation stage becomes.
Analysis on Selection of Water Ring Vacuum Pumps in the Chemical Industry
Authors: Yu Hong Mei
Published: June 2013

With the rapid development of the world economy, energy has become tighter. Industrial equipments play an important role in the development process of the world economy, at the same time they also consume a lot of energy. Equipment selections are related to the different working conditions, such as temperature, pressure, load, economy etc. Reasonable and scientifically select the equipment and the auxiliary devices can meet the specifications required, while also help on energy saving and consumption reduction. In this article, this paper discusses on the reasonable correct selection of the 2BE1 series water ring vacuum pumps in the chemical industry.
The Inertia Force of the Vanes in the Hydraulic Vane Pump with Advanced Hypertrochoid Curve in the Inner Surface of its Stator
Authors: Ebrahimi Mojtaba , Jazayeri Seyed Ali
Published: June 2013

The possibility of application of the advanced hypertrochoid curve in the inner surface of the stator of fixed displacement hydraulic vane pump, theoretically was studied in the last our work. By considering the properties of this curve, sealing action between pressure and suction sides of the pump can be improved. One of the important characteristics of a new profile must be improving of the inertial reaction of the vanes in each position where these vanes have a radial movement because it causes a smooth sliding motion of the vanes, and hence, a higher performance of the pump while attaining a longer life of it. Then at this paper, the effect of the inertial force of the vanes on the performance of the pump with this curve will be studied. The regular motion of the vanes on the inner surface of the stator with smooth profile suppresses the lateral reactional force applied to the vanes and results to diminish local wear of the vanes tip and noise.