bluuebunny/crossref_metadata_2025 huggingface dataset:
The Design and Implementation of Revise System on Frequency Response about Power Amplifier of Shortwave Transmitter
Authors: Shan Hong Chang , Gao Jun , Qu Xiao Xu , Gan Xi
Published: January 2015

A revise system on frequency response based on power amplifier of shortwave transmitter is designed to solve the problem of nonlinear response at different frequencies on power amplifier. This system is able to guarantee the output of power amplifier to fluctuate slightly around the rated power though the two processes named pre-revise on frequency response of power amplifier and current revise on frequency response of power amplifier. A modified variable step and multi-rate updated LMS algorithm is put into use to reduce the calculated amount and boost the rate of the revise. It is demonstrated by experiment that the revise system of this paper is able to guarantee the output of power amplifier around the rated power with the deviation of dB at a high convergence rate.
The Limitation of Maximum Detectable Deformation Resolved by Differential SAR Interferometry
Authors: Li Jian Long , Xu Hua Ping , Wang Bi Jun
Published: January 2015

Differential SAR interferometry (DInSAR) provides a new tool for detecting deformation in the line of sight (LOS) of Earth’s surface. However, not all deformation can be detected. In order to get the maximum detectable deformation, the decorrelation in terms of coherence and deformation has been proposed. The influence of deformation on decorrelation is then discussed for both registering drifted pixels method and registering fixed method. Based on aforementioned analysis, the limitation of maximum detectable deformation has been derived for these two cases. Furthermore, computer simulations are carried out to confirm the detectable deformation discussion as the coherence equals to 0.5. The result of registering drifted pixels method shows that the detectable limitation does not only depend on coherence but also on other factors such as beamwidth. The result of registering fixed pixels method, however, shows that the detectable deformation and baseline have an inverse relationship.
Active Contour Model Coupling Local and Global Information
Authors: Wang Zhi Feng
Published: January 2015

The local region term and global region term are combined for image segmentation. Intensity information in local regions is utilized by adding a kernel function in the data fitting term. Experiments have been done on different images to compare the effectiveness of our methods with that of the classic CV model, Li’s Local Binary Fitting (LBF) model. Experiment results show that the new model maintain more satisfactory segmentation results.
Spectral Synchronization Reveals Community Structure
Authors: Zhou Ming Yang , Fu Zhong Qian , Zhuo Zhao
Published: January 2015

Practical networks have community and hierarchical structure. These complex structures confuse the community detection algorithms and obscure the boundaries of communities. This paper proposes a delicate method which synthesizes spectral analysis and local synchronization to detect communities. Communities emerge automatically in the multi-dimension space of nontrivial eigenvectors. Its performance is compared to that of previous methods and applied to different practical networks. Our results perform better than that of other methods. Besides, it’s more robust for networks whose communities have different edge density and follow various degree distributions. This makes the algorithm a valuable tool to detect and analysis large practical networks with various community structures.
Subjective Comparison Experiments of DMS and Conventional Stereo
Authors: Zhao Wei , Huang Guo Pin , Zhang Qin
Published: January 2015

Multi-channel dynamic matrix sound system (DMS) is a multi-channel input and output sound system which is based on source synthesis and Huygens' principle. The sound sources are recorded by microphone array and multi-channel independent recording, instead of the field. This paper describes the results of the subjective evaluation experiments between DMS and conventional stereo system by the semantic differential (SD) method. Five parts of the audio materials and a training material, including the human voice, music, sound effects, were used as the stimuli. All of the stimuli were recorded by the DMS and conventional stereo system respectively. The results proof that the effectiveness of DMS, which has a higher level of sound quality and can give the audience the experience of dynamic subjective feelings compared with conventional stereo system. Furthermore, sound designers must carefully consider the influence of gender, age, preferences on the hearing impression.
Fabrication and Photocatalytic Activity of Photocatalyst Coatings by Mechanical Coating Technique and the Oxidation at Relatively Low Temperatures
Authors: Lu Yun , Hao Liang , Kobayashi Kohta , Sato Hiromasa , Yoshida Hiroyuki , Guan Su Jun , Chen Jin Xiang
Published: January 2015

Titanium (Ti) coatings on alumina (Al2O3) balls fabricated by mechanical coating technique (MCT) were oxidized at relatively low temperatures. Crystal structure and microstructure of the coatings were investigated. Photocatalytic activity of the coatings was evaluated and discussed. The results showed that TiO2 films on Ti or Ti/TiO2 coatings were fabricated by the MCT and subsequent heat oxidation. The TiO2 is anatase phase if the heat oxidation temperature is under 773 K. The TiO2 is the mixed phases of anatase and rutile if the heat oxidation temperature is in the range of 673–973 K. Besides, rutile TiO2 is formed if the heat oxidation temperature is beyond 1073 K. Photocatalytic activity of anatase TiO2 is higher than rutile TiO2.
Modeling and Simulation of a Roller Coaster
Authors: He Xiao Yao , He Han Wu , Hu Zhao Yong
Published: January 2015

Taking roller coaster as the research object, select segmentation fitting to get the curve equation of the track based on the discrete points on the track, use Solidworks and Eon Studio to make model and simulation. Providing a reference for the modeling and simulation of reptile rides by studying track modeling and motion simulation of roller coaster.
Speed Control System for Variable Speed Fixed-Pitch Wind Turbine Based on Internal Model Control
Authors: Zhang Gan Sheng , Xie Wei , Li Xiang Jun , Li Bo
Published: January 2015

The paper deals with speed control system design for variable speed fixed-pitch (VS-FP) wind turbine based on improved internal model control. The design procedure includes two steps: first nominal controller is considered that the VS-PF wind turbine works well around its operating point; second, a stable compensator is designed to reject the influence of external disturbance on the control performance when external disturbance occurs. Finally, a numerical simulation is presented to illustrate the efficiency of the proposed method.
Penetration Efficiency Evaluation of Missile with Jammer
Authors: Liu Jing Shu , Jiang Wen Zhi , Liu Tao
Published: January 2015

Abstract: In order to improve the penetration efficiency of missile, an effective suggestion is fixing jammer in missile. The jamming can decrease the radar detection range of air-defense missile weapon system, so the intercept frequency is lessened. In this paper, it builds the intercept model of ship-to-air missile with radar detection range. Thus, the penetration probability of missile is presented. Finally, the simulation illustrates that the jamming is effective, and the results can provide suggestion on the jammer parameter design.
Research on Power Balance Control of Multi-Motor Driving Belt Conveyor System Based on Controlled Transmission Device
Authors: Wang Xin Huan , Zhang Hong Wei , Fu Zi Yi
Published: January 2015

According to the existing problems of driving equipment for belt conveyor, a novel design scheme of controlled transmission which uses hydraulic transmission system driving worm gear to control the output speed of planetary gear mechanism is proposed. The control strategy of multi-motor drive power balance which adopts master-slave structure is designed. The master driver adopts speed closed-loop control with current limiting and the slave drivers adopt power closed-loop control. The given power signal of slave pulley is decided by the master motor. The control system offers multiple communication interfaces which enable the belt conveyor to integrate in coal mine information platform and realize information resource sharing. The controlled transmission device and its power balance control system have characteristics of compact, reliable and high efficiency.
An Educational Platform for Cascade PWM STATCOM
Authors: Zhang Yan Jie , Xu Zhi Heng , Zheng Zhuang Zhuang , Wang Ji Xin , Liu Yu Hai
Published: January 2015

This paper presents a training system based on low-voltage cascaded PWM STATCOM.It is intended to train the employee in power grid companies.The system is characterized by load disturbance in 380-V power grid and imaginary power compensation of transformerless cascade PWM STATCOM with star-configuration. A two-hierarchy DC voltage balance strategy is adopted to stabilize the H-bridge capacitors in the compensation procedure. Simulation and experimental waveform indicate that a 380V-20kvar cascade STATCOM with star-configuration compensate the the imaginary power shortage within 20ms.
Design of Digital Cymometer Based on EDA Technology
Authors: Sun Hao , Duan Xin Wen , Liu Yuan
Published: January 2015

To overcome the shortcoming that the traditional cymometer has a relatively large delay, small measuring range, low precision, poor reliability and complicated circuit; A design of digital cymometer based on EDA technology is proposed. The design is programmed with the hardware description language of VHDL. And it takes full advantages of Max+PlusII software to compile and simulate. All the functions are downloaded into and debugged on the chip of EP1K100QC in ACEX1K series from Altera Company. The experimental results show that this system has a very high reliability and small measuring error. The function of this system completely satisfies the demand of the design.
Application Research of JTAG Standard Based on ARM Debugging System
Authors: He Hui Qin
Published: January 2015

Currently, the JTAG debugging is the most popular technology in the embedded ARM system. After providing a perfect JTAG debug method based on the GPIO pins of ARM chip, the paper analyzed the inner technology by which JTAG standard was accomplished. At last, the focus has been put on the analyses of the Boundary-Scan Chain working processes.
SFP + High-Speed Channel Performance Simulation and Measure
Authors: Jiang Pan , Zhou Run Jing , Zhou Jia Lu
Published: January 2015

The 10Gbps high-speed serial interface has been used in data transmission widely. As the bandwidth demanding for high-speed communication network sharply increases, it is increasingly important to investigate the interconnection of high-speed serial interface. In this paper, the SFP+ interface signal integrity (SI) were analyzed with EM simulation and the lab measurement. The 2.5D and 3D modeling methodologies were introduced for the interest transmission line in the frequency domain. We measured its differential mode (DM) reflection and transmission coefficients, subsequently observed the variation of DM impedance and analyzed the causes of impedance discontinuity by the utilization of TDR measurement, and finally put forward several methods to improve the SI. It is notable that the simulation results of the 2.5D and 3D model are almost identical by comparison, which means that 2.5D modeling methodologies also can achieve high accuracy around 10Ghz. Additionally, we optimized the SI simulation results by varying the output voltage and pre-emphasis parameters. Finally, the SFP+ compliance test shows the simulation has good agreement with lab measurement in the time domain.
Implementation of Vehicle Safety Distance Warning System Based on FPGA
Authors: Wang Yu Xue , Xu Yi Nan , Ma Yong Hu , Jin Chang Shou
Published: January 2015

Distance is usually obtained by ultrasonic wave. This research breaks the rules. Here the information of distance is got by visual range, which has been one of popular fields for many years. In this paper, the advance alarm system uses image processing technology to calculate distance between two vehicles. The system can accurately obtain distance and alarm effectively. The system is implemented by FPGA (Filed Program Gate Array), ARM and image sensor and calculate the distance through visual range technology. The simulation environment is built by HBE-SoC-EXPERT II development platform.
An Information Collection and Transmission Strategy of Vehicle State-Aware System Based on OBD Technology and Android Mobile Terminals
Authors: Wei Zhi Qiang , Wang Xiao Wen , Jia Dong Ning , Liu Hao
Published: January 2015

To provide the Traffic Regulatory Authority with detailed driving status of vehicles when an accident occurs, this paper proposes an information collection and transmission strategy based on OBD technology and Android mobile terminals. This strategy records the representative detailed operation parameters and location information of traveling vehicles. It removes the drawbacks of server load existing in the conventional vehicle state-aware systems, due to collect and upload the data in real-time. At last, we achieve a highly efficient transmission process by compressing the uploaded data.
A Test Rig for Smart Substation Training System
Authors: Zhang Yan Jie , Xu Zhi Heng , Zhang Hai Bo , Wang Xing Qiao , Shi Xue Hua
Published: January 2015

The concept of smart substations has been widely used in power systems. Since the variation in interfaces and communication manner, the operating& maintenance methods for smart stations have changed a lot compared with the traditional substations. In this paper , a training system based on virtual substation primary equipment combined with real secondary devices is developed for accident management and operating work in smart substations. The training system is also used to test the relay protection algorithms、Ethernet switch functions、fault recorder actions ,and so on.
A Solar Irradiance Data Acquisition System Based on Labview
Authors: Duan Xin Wen , Zhang Yue
Published: January 2015

The application of virtual instrument technology to design solar irradiance acquisition system, an ideal combination of software and hardware, is aimed at collecting, storing and analyzing data of external temperature and solar irradiance.The data proves helpful in assessing whether the solar energy resource deserves to be developded economically.The system is reliable and has been verified by simulation software proteus.
A Detecting Method of Electric Shock Signal Based on Chaotic Theory
Authors: Xu Yan Chun , Chen Guo Xun
Published: January 2015

It is difficult to detect and judge a weak electric shock signals in the leakage current accurate in the low-voltage power grid .A novel chaotic detection of the electric shock current and Lyapunov exponent is introduced in this paper .Electric shock current component is extracted according to the characteristics that chaotic system’s bifurcation action from chaotic state is sensitive to the weak signals and immune to noise .The largest Lyapunov exponent is proposed as the judgment criterion of phase transition of chaotic system. It can automatically recognize the critical state before and after electric shock.
A Content-Based Routing Algorithm in WInternet Pipe Communication Protocol
Authors: Zhi Hai Bang , Ye Chen
Published: January 2015

In this paper, we propose a content-based routing algorithm for WInternet Pipe Communication Protocol. A filter model based on a multilevel index structure is established to judge the covering relation between two subscription criteria. Furthermore, our routing algorithm takes advantage of covering relations and link status among nodes to build a virtual message distribution tree for each OutGate. Meanwhile, it supports nodes join and leave dynamically without impacting the routing accuracy. Analysis result shows it can reduce the message matching costs, keep the load balance among nodes and improve the transmission performance of WInternet to some extent.
Realization of Signal Tone Detection in Power Line Carrier Terminal
Authors: Gu Zhi Ru , Liu Da Wei , Liu Hong Li , Xu Kun
Published: January 2015

—when the noise cancellation system ( NC ) is used in the down link of the power line carrier terminal, it can cancel the background noise and narrowband interference, but the downlink signal tone distorts at the same time. This is because the VAD algorithm of the NC system is sensitive to dramatic changes in the power of signal tone. Through detailed researches on time frequency characteristics of signal tone and error factors of network transmission, a new signal tone detection algorithm that applicable to downlink NC system was put forward, The algorithm detects signal tones through changes of frequency-domain power and time-domain signal period of every frame. After theoretical evaluation and practice tests, it is observed that the above-mentioned algorithm can correctly detect signal tones without influence on functions of the NC system, so as to avoid the occurrence of distortion.
Churn Influence Diffusion in a Multi-Relational Call Network
Authors: Olle Olle Georges , Cai Shu Qin , Yuan Qian , Jiang Shi Miao
Published: January 2015

Customer Churn is a pesky problem that continues to haunt telecommunication companies. Social influence analysis has recently been introduced in churn prediction, motivated by the fact thatsome users can churn due to accumulated churn influence that they’ve received from other churners.We’ve collected call data records of about 10 thousands mobile phone users of one the largest mobile network operators in China,and have built a Multi-relational call network which is a graph constructed by mobile phone users considered as nodes and the interactive calls between them considered as the relationships or edges. We’veapplied Linear Threshold (LT) to model the diffusion of churners influence in theobtainedsocial network, in order to analyze the relevance of social affinities in the diffusion of churn influence.The results indicate that churn influence diffusion depends not only on the number of initial churners but also on the existingaffinities between users.
The Application of Cloud Computing in the E-Government Data Management
Authors: Li Yan , Wan Fen Fen , Hu Xiao Qiang
Published: January 2015

With the thorough development and utilization of electronic government information resources, some phenomena are presented, such as: a large amount of data and data concentration, insufficient sharing of information resources and unsafe data exchange and so on. The construction and operation of traditional e-government data management can't meet those needs. Cloud computing is mainly aimed at intensive work load of mass data. It can allocate resources dynamically and adjust the load. This paper mainly deals with how to use cloud computing model to reduce the cost and risk of information sharing in e-government data management, so as to improve the operational efficiency of e-government data management.
Application and Discussion of Cloud Computing in Academic Libraries
Authors: Zhang Chun Hong
Published: January 2015

Beginning with the meaning and characteristics of cloud computing, author discusses the library is integrated with cloud computing technology. Cloud computing plays a very important role in resource development and services for the library. Cloud computing provide the sharing of hardware and software on the data storage, data management, it also has the capabilities with the database resource sharing, unified digital resources, one-stop entrance, a full range of user interactive services, the expansion of the complex network applications and services. This paper proposes several suggestions about the characteristics of cloud computing technology in library applications.
Application of Orthogonal Experimental Method in the Sealing Design of a Bolted Flange Connections
Authors: Lv Xiang Kui , Li Jun , Huang Xiao Ming , Xu Guo Liang
Published: January 2015

The paper aims to provide a theoretical method of multi-parameter optimization collocation for sealing structure design. Based on the tightness analysis method, the paper analyzed the effects of several major influence factors on the maximal gasket contact stress. Some sensitive parameters were chosen according to the tightness analysis results. Orthogonal experiment method was applied in the current work to find the optimum combination of parameters which will contribute to a better sealing performance of the connections. The theoretical way proposed in this paper can effectively shorten the design period and is helpful to improve the quality of the design and reduce the design cost.
A New Approach to Calculate Shutdown and Restart Pressure of Waxy Crude Pipeline
Authors: Zhang Jing Nan , Lan Hao , Li Jia Jun , Cui Bo , Diao Hong Tao
Published: January 2015

On the basis of Tianyou Liu start-up pressure calculation model, the restart pressure model was divided into three parts. Considering the pressure drop caused by elevation difference along the pipeline, friction pressure drop was solved by pipe regional discretization and Houska thixotropic model was used in the pressure drop caused by thixotropic factor. A new calculation method of waxy crude oil pipeline restart pressure was set up and Qin-Jing Pipeline data were substituted into corresponding analog computation. Calculation results are in conformity with the actual situation and the new calculation method is more widely applicable.
Analysis of Loads and Response on Flexible Riser under the Combined Effects of Wave and Current
Authors: Wu Zi Xin , Zhu Ren Qing , Gu Si Qi , Xia Zhi Ping , Luo Yang , Li Hong Yan , Wang Ling
Published: January 2015

A three dimensional computational model is established for the analysis of loads and response of flexible riser in a wave-current coexisting environment. The viscid fluid is assumed incompressible. The flow field is described by continuity equation and Reynolds Average Navier-Stokes equations and solved with the discretization of Finite-Volume Method. The structure responses are analyzed employing finite element method based on three dimensional solid element. The loads and response are calculated through the CFD module System Coupling in software package ANSYS14.5. The results show that the vibration equilibrium position of riser offsets along with the direction of current when wave and current are in the same direction, the response of the riser is larger than that only in wave, the vibration amplitude increases with the current and the results are opposite to the above when wave and current has the opposite direction.
Initial-Boundary Value Problem on Unsteady Flows in a Canal
Authors: Nie Da Yong
Published: January 2015

In this paper we consider initial-boundary value problem on unsteady flows in a canal, which is an important model in hydrodynamics, under certain assumptions, the global resolvability of classical solution is obtained by using the method of global extension.
Study on the Design of Wetland Based on Hydrodynamic Condition - A Case of Candle Lake Wetland at Qingxiu Mountain Scenic Spot in Nanning City
Authors: Liao Qiu Lin , Li Gen , Shen Shou Yun
Published: January 2015

Candle Lake wetland at Qingxiu Mountain scenic spot is one of the most important parts of the 'China Water Town' program in Nanning city. In order to figure out the scientific rationality of the situation and design of wetland system, five pilot programs are set up based on flow velocity of three inlets, quantity and position of five outlets and the shape of center island to simulate the flow field and velocity of Candle Lake wetland by using two-dimensional numeral simulation. The results indicated that as follows: 1. The flow field and velocity of Candle Lake wetland can't be improved by increasing the velocity of inlets in the wetland system, so that the problem of large standing water can’t be solved. 2. The flow field and velocity of Candle Lake wetland are influenced by the position and quantity of outlets, especially the outlet 2, outlet 4 and outlet 5, which can improve the flow field and velocity effectively. 3. The flow field and velocity of Candle Lake wetland are also influenced by the shape of shoreline. Optimizing shoreline of Chengxiang Island can improve the flow field and velocity of Candle Lake wetland near the island very well. The flow field and slow velocity of Candle Lake wetland can be improved effectively by the optimizing shape of the Chengxiang Island and the position of outlet 4 and outlet 5, and the problems of large standing water and circulation can be solved very well.
Active Set Algorithm Applied to Discrete Mechanics and Optimal Control for Constrained Systems
Authors: Gao Lei
Published: January 2015

Discrete mechanics and optimal control for constrained systems (DMOCC) is a new developed solution for mechanical control. The formulation of DMOCC is attributed to nonlinear equality constraints for the minimization of an appointed cost function. Traditionally, the equations are solved by standard sequential quadratic programming (SQP) algorithm, which suffers for relatively slow convergence speed. In this paper, active set algorithm is introduced to the numerical solution of DMOCC. By comparison of these two algorithms for the example of transferring of the rigid sphere, the efficiency of active set algorithm is validated.
Study on the Strength of Different Door-Type Structure of Attached Type Lifting Scaffold
Authors: Xu Hong Wei , Zhang Hang , Liu Bang Li , Wen De Gang
Published: January 2015

Attached type lifting scaffold is an important engineering machine which is used for building construction. In this paper, the strength of door-type structure of attached type lifting scaffold is studied. The diagonal brace is removed in the new structure and replaced with two short braces. The two type structure elastic FE models are founded and ANSYS software is used to compute the stress and deformation. The results are compared. The comparison study shows the new structure’ strength and stiffness are both better than the old one. Therefore, the new structure of door-type frame is much better than the old structure not only in cost-saving but also in easy through.
Finite Element Model Updating of T Beam Bridge Based on ANSYS
Authors: Li Yan Wei , Zhang Lin Hai
Published: January 2015

Setting up a model for the structural finite element, there are inevitably differences between the model and the real bridge .To make the model accurate it is necessary to update the model by using static performance results. In this paper, the optimization function of ANSYS is used to update the real bridge’s model. The final updated finite element model for the real beam is able to produce natural frequencies closer to the real ones .The updated is useful for the reference model to structure damage and condition assessment.
Heterogeneous Shrinkage of High-Strength Concrete by the Volume of Large-Size Structural Elements
Authors: Korsun Volodymyr I. , Vatin Nikolai , Korsun Artem , Nemova Darya
Published: January 2015

The article introduces results of the experimental research of the influence of the scale effect on the shrinkage strain of high-strength concrete of C70/85 class as well as recommendations for accounting in practical calculations of the scale effect influence on the characteristics under research.
Synthesis of Pure Thaumasite
Authors: Gemrich Jan , Jiroušková Kateřina , Kulísek Karel
Published: January 2015

In this work, synthesis procedures to obtain thaumasite and different influences on its formation were revised. Theoretical background is compiled in this paper from published sources with focus on synthesis of pure thaumasite in laboratory environment.
Mechanical Properties and Surface Morphology of Diamond-Like Carbon Films with SiNx Interlayer
Authors: Chen Qing Yun , Shih Kai Min , Duan Man Yi , Wang Lie Lin
Published: January 2015

Diamond-like carbon (DLC) film has remarkable physical, mechanical, biomedical and tribological properties that make it attractive material for numerous industrial applications needs of advanced mechanical systems. In this study, deposition process of DLC films on Si (100) are performed by direct-current (DC) magnetron sputtering method. The effects of interlayer on the compositions, structures and mechanical properties of DLC films are studied. The scanning electron microscopy (SEM) and atomic force microscopy (AFM) studies reveal the creation of high uniform surface morphology and low roughness DLC films with SiNxinterlayer. For comparison, DLC films with different interlayers are also grown. The Raman spectra are analyzed in order to characterize the film compositions. Indentation test was performed to value the mechanical properties of DLC films. Raman, SEM, and AFM analyses are correlated with the mechanical properties of the DLC films.
The Synthesis and Properties of Metal Selenide Nanostructures
Authors: Zhang Ya Hui , Cheng Xi , Wang Qing
Published: January 2015

Metal selenide has been the subject of considerable interest because of its potential applications in many fields. In this paper, the synthesis of metal selenide nanostructures is described. The Morphologies of as prepared metal selenide nanostructures are summarized. And the applications and prospects of metal selenide in this field also are analyzed.
Atomic Structure and Diffusion Properties of Liquid Cu45Zr48Al7 Metallic Glasses
Authors: Xia Ji Hong , Gao Xue Mei , Xiao Xu Yang , Cheng Zheng Fu , Jiang Yan
Published: January 2015

The microscopic structure and diffusion of liquid Cu45Zr48Al7 alloys were investigated by means of molecular dynamics simulations. We obtain the structure and diffusion properties including partial pair-correlation function, and Voronoi indices and the time-dependent mean-square displacement (MSD). We found that the icosahedra and the distorted icosahedra around Cu, Zr and Al are differentthe and the atom moves quickly Zr, Cu and Al in the order.
Ammonia Leaching Study on Carbonate Oxidised Copper Ores in Yunnan
Authors: Bi Ke Jun , Fang Jian Jun , Jiang Tai Guo , Li Guo Dong
Published: January 2015

The effects of oxidized copper ores which came from Yunnan province were carried out by using ammonialeaching methods in the laboratory.In order to seek the optimum leaching conditions under normal temperature and pressure,we conducted a series of validation experiments. Theoptimum conditions were obtained as follows: ammonia concentration 2.5mol/L, ammonium sulfateconcentration 2.5mol/L,grinding fineness about 80% -0.074mm, liquid-solid ratio 2.5:1and leaching time was 2.5h. Under these experimental conditions, the copper leaching rate could reach 69.91%.
Attenuation Characteristics of Stress Wave Propagation in a Polycarbonate Rod Using Wavelet Packet Analysis
Authors: Li Lin , Hu Wen Jun , Tao Jun Lin
Published: January 2015

In this paper, a method of wavelet packet decomposition and multi-frequency band analysis is considered to study the amplitude attenuation characteristics of stress wave propagation in a viscoelastic polycarbonate (PC) rod. The reconstruction coefficients of different frequency bands could be acquired through wavelet packet decomposition and reconstruction. Associate conjugate gradient method with modified Sadaovsk formula to fit the curve of peak amplitude for each frequency band, from which the amplitude attenuation characteristics and attenuation rates of each frequency band with the increasing of the propagation distance were obtained. Predicted the waveform in the light of viscoelastic attenuation behavior of different frequency bands, it gives better mean square error (MSE) compared with the actual waveform. This result indicated that this method can effectively predict the propagation disciplinarian of the viscoelastic stress wave.
Molecular Dynamics Study of Thermodynamic Properties of Cu-Pd Clusters
Authors: Huang H. , Cheng Z.F. , Xiao X.Y. , Xia J.H. , Liu T.Z. , Long Lin , Zhang Ya Lin
Published: January 2015

This paper studies the melting of Cu-Pd bimetallic clusters with different Pd positions by using molecular dynamics simulation with a general embedded-atom method. The melting of clusters with 55 Pd atomic distributing different positions where the core-layer, second-layer, third-layer, fourth-layer and mixed. It is found that the changing of melting point is strongly related to the position of Pd atomic. The results indicate that the Pd atoms doped in the core layer and surface layer, below the melting point of the second layer and third layer. Meanwhile, this indicate that the Pd atomic doped in the second layer and third layer, the structure of cluster is relatively stable. The irregular phenomena of the melting were induced by the Pd position. This gives a new method to tune the melting point in bimetallic clusters.
An Experimental Research on Generalized Prandtl-Ishlinskii Model for Modeling Asymmetric Hysteresis of a Piezoceramic Actuator
Authors: Feng Shi Peng , Li Dong Xu
Published: January 2015

A piezoceramic actuator is widely employed in micropositioning and MEMS. However, the piezoceramic actuators are limited due to the natural hysteresis nonlinearity which affect the accuracy of the actuators in applications. In order to revise the hysteresis nonlinearity, lots of hysteresis models have been proposed such as the Preisach model, the classical Prandtl—Ishlinskii model and so on. While some drawbacks still exist with these models, a generalized hysteresis model for asymmetric hysteresis basing on the classical Prandtl—Ishlinskii model is devised. In the modified model, the exponential functions which contain the amplitude and the frequency of the input voltage and its gain factor are introduced into the NLPO (nonlinearity play operator). As a result, the generalized model in this paper applies to modeling asymmetric hysteresis. This model was identified and simulated using the experimental data by other researchers. At last, the validity and the accuracy of the given model were tested through the experiment of the piezoceramic control.
Numerical Simulation on the Whole Co-Extrusion Process of Tread Rubber
Authors: Li Jun , Liu Qi Wen , Liu Li Sheng
Published: January 2015

The Phan-Thinen and Tanner (PTT) model was used to describe the co-extrusion behavior of tread rubber which is made up of two components. To investigate the effects of upper and lower channels on simulation results, two kinds of Finite Element (FE) models were established. One of them contained the upper and lower channels, while another did not. Comparison between the computational results and corresponding test data illustrates that the difference of these two models is obvious, which suggests that the consideration of upper and lower channels play an important role in analysis on polymer’s co-extrusion process. Besides, we also analyzed the effects of wall slip coefficients on co-extrusion products. The results show that the decreasing of wall slip coefficients can reduce the extrusion swell phenomenon effectively, but it may bring out the distorting of the corner parts of co-extrusion section shape. Therefore, various factors need to be comprehensive taken into account in the selection of wall slip coefficients.
Experiment on Recovery of Multi-Metal from Zinc Volatile Kiln Slag in Xining
Authors: Li Guo Dong , Fang Jian Jun , Jiang Tai Guo , Bi Ke Jun
Published: January 2015

For the comprehensive recovery of copper, zinc, silver and iron from the zinc volatile kiln slag in Xining, exploratory experiments were conducted by adopting single flotation, magnetic separation and combined process of magnetic separation and flotation. The results showed that the above process cannot effectively recover copper, zinc and silver from the ore. The recovery of iron is better by single magnetic separation. The grade of iron concentrate reaches 69.05% and the recovery is 41.86%.
Progress on Research of Machining of Difficult-to-Machine Materials Using CBN Cutting Tools
Authors: Gao Shi Long , An Li Bao , Wang Xiao Chong , Gao Song
Published: January 2015

Some engineering materials have excellent performances, but the machining of these materials is a problem. It is very inadequate to meet machining requirement only using traditional cutting tool materials. Therefore, exploring the machinability of difficult-to-machine materials and applying appropriate cutting tool materials have drawn much attention in metal cutting industry for guarantied product quality and productivity. Cubic boron nitride (CBN) has been recognized as one of the most suitable cutting tool materials due to its high hardness, high wear resistance, high chemical inertness, and excellent chemical stability in high temperature. Research on various aspects of CBN cutting performances has been conducted in recent years. This paper presents the progress on machining difficult-to-machine materials using CBN cutting tools.
Thermal Analysis of Concrete Structures with Pipe-Cooling System by a New Algorithm
Authors: Zhu You Ping , Feng Shu Rong , Shi Qing Chun , Su Jun An
Published: January 2015

In this paper, we proposed a new algorithm to calculate the temperature field of concrete structures with pipe-cooling system. As we know, the pretreatment of pipe model is hard and the calculation will be time-consuming. However, in this algorithm, the computing information of pipes will be included in the exist nodes of elements, so the workload of pretreatment would be reduced. Meanwhile, the finite element method (FEM) format and the formula of water temperature along pipe have been established in this paper. Iteration was not required in this method, so the computing speed will be improved too. An example has shown that this algorithm can response temperature gradient near the pipe and have good efficiency to calculate temperature field of concrete structures with pipe-cooling system.
Damage Identification of Plane Truss Structure According to Square Difference in Elemental Modal Strain
Authors: Liu Wei Ran , Du Shou Jun , Zhang Li Mei
Published: January 2015

A method based on the square difference of elemental modal strain was proposed to determine the damage location and damage degree. The square difference of elemental modal strain was expressed damage before and after. Simulation results show that: this method is effective to locate the single, multiple damages and light, severe damage with low-order modal information. Damage degrees can be initially determined by the values of the square difference of damaged-element modal strain. Furthermore, the result also shows that this method can accurately identify the damage location of plane truss structures with noise.
The Similar Relationship Research of the L-Type Eccentric Structure Model on Vibration Test
Authors: Chen Ai Jun , Jiang Xiao Mei , He Guo Jing
Published: January 2015

Vibroplatform test is an important means of testing the dynamic characteristics of the laboratory sim-ulating structure under seismic action. For structure whose volume and weight exceed the limits of vibroplatfor-m tests is usually carried out through model test according to the similarity theory. So how to deal with the simil-ar relationships among the test model and how to verify thethe rationality of vibration control strategy through testing results become the key and fundamentalproblems. 1:15 scaled models will be made through the dimensional analysis based on a 4 layersL-shaped frame structure as the proto-type , which are made from micro-concrete, aluminum alloyand plexiglass. SFMT sap2000 is used to make a dynamic analysis to get the values of period,acceleration, velocity, etc. Comparing the results of prototype inferred from model through similarrelationship with theoretica-l values of prototype to get the correct formula and confirm the bestscaled model and then provide references f-or model test later.
Research of the Vertical Vibrations of Tandem Mill Based on Wavelet Analysis
Authors: Ren Chun Hua , Ma Xu , Li Ze Ming , Ding Yan Hong
Published: January 2015

In this paper, the defect sheet was captured coincidentally. According to the defective product’s characteristics, we suspected to be caused by the vertical vibration of the roll. When the rolling speed reached a certain value, the vibration of the fourth stand can be feel. The experiment of the vibration data collection was taken to compare the vibration parameters of rolling operating side with those of drive side by wavelet analysis. The result states that the abnormal vibration signal features can be extracted in a special frequency segment of wavelet decomposition, and the vibration frequency to the roll is confirmed which appeared product defects.
Research on Vibration Parameters of Tamping Operation
Authors: Zhou Tao Yong , Hu Bin , Peng Yong Xin , Yan Bo
Published: January 2015

Tamping operation is an important work of railway maintenance. There are many factors that can influence the tamping effect. This paper mainly studies the influence of vibration frequency and amplitude on the porosity of railway ballast. In order to obtain the minimal porosity, the response surface method was used to seek the optimal vibration parameters. Using an optimization method, the optimum vibration parameters were obtained that gives the minimal porosity. The obtained results are consistent with those of other similar studies, which mean that the response surface method is an effective analysis method of multi-parameter optimization problem under tamping operation.
The Measure of Missile’s Capture Performance Based on the Geometric Counts under HPM Damage
Authors: Ran Ling Sheng , He Song Hua , Lu Da Wei
Published: January 2015

In order to measure capture performance of the seeker in the typical terminal guidance scene under HPM damage effect, the paper proposes a new method to model the dynamic capture state in different ballistic position. The proposed missile-target geometry count can be used to process multiple data generated in multiple Monte Carlo simulations under the same scene, which facilitates capture performance comparative analysis between different scenes. Simulations validate proposed counting measure, so that it can be applied for measuring the performance of missile capture.
Instability of Sleeve Member with High and Ordinary Strength Steel
Authors: Bai Zheng Xian , Guan Hong Yang , Chen Ming Fei
Published: January 2015

Ultimate instability of sleeve member with Q460 inner pipe and Q235 outer pipe was analyzed. Numerical models of one-ring and three-ring sleeve members were established and calculated by ANSYS. By analyzing relationship between ultimate load and stiffness ratio & slenderness ratio of sleeve members, the influence of stiffness ratio and slenderness ratio on the stability capacity was studied. Instability capacity of one-ring sleeve member was also compared with that of three-ring sleeve member. The results show that sleeve member can make good use of the high strength of inner tube, and the effectiveness is improved by increase of the slenderness ratio.
A Symplectic Method for Dynamic Response of Structures
Authors: Li Wei Hua , Sun Hong Ying
Published: January 2015

A modified Hamilton’s principle corresponding to initial value problems of dynamics is presented. Based on this principle and combined with Lagrange interpolation method, a symplectic method is constructed. The evaluations of the stability and accuracy of the proposed method are also given in this paper. With some numerical examples introduced, the proposed method is performing well and is a powerful tool for practical dynamic analyses.
Characterization on the Precipitates in the Ti-Ni-Al-Zr Alloy during Heat Treatment
Authors: Sheng Li Yuan , Yang Fang , Xi Ting Fei
Published: January 2015

In the present paper, the Ti-15Ni-6Al-2Zr alloy is fabricated and heat treated at different temperatures. Its microstructure and morphology of Ti2Ni phase are investigated by SEM and TEM. The results reveal that the Ti-15Ni-6Al-2Zr alloy is composed of eutectoid and eutectic microstructure, which possesses fine Ti2Ni fiber in eutectoid region and fine α-Ti phase in eutectic region. With the increase of heat treatment temperature, the amount of α-Ti and Ti2Ni phases decrease gradually. When the heat treatment temperature is higher than 900°C, almost no α-Ti phase is left. The transformation temperature of α-Ti phase to β-Ti phase is about 850°C, and the transformation of α-Ti phase promotes the decrease of Ti2Ni phase. During the heat treatment, the Ti2Ni fiber phase experiences the refining, fragmentation, coarsening and granulating.
Application of Biological Contact Oxidation Process of Sewage Treatment in a Hospital Study
Authors: Sun Lei
Published: January 2015

Hospital sewage effluentwater quality similar to that of its integrated waste water, waste watercontent than the more complex chemical composition, the use of this treatmentis a biofilm of bio-contact oxidation process for the management of hospitalWaste water to run effective and save operating costs, facilitatethe management of operations, and achieved satisfactory economic benefits,social benefits and environmental benefits.
A Monte Carlo Method for Simulating Drying Temperature of the Gas-Sensing Material Based on Polyacrylonitrile
Authors: Semenistaya Tatiana , Plugotarenko Nina K. , Petrov Viktor
Published: January 2015

The calculations of the dimer, trimer and tetramer molecules of polyacrylonitrile (PAN) using the quantum-chemical method are carried out. The computer simulation of formation of a polymer PAN chain by the Monte-Carlo method taken with the Metropolis and Wang-Landau algorithm is done. Technology of fabrication of gas-sensing material based on metal-containing PAN is developed. Electroconductive metal-containing PAN films are fabricated by method of pyrolysis under the influence of incoherent IR-radiation. Their sensing properties are studied.
Study on Middle Annealing Process of Cu-Ag Alloy Applied to Motor Commuter
Authors: Peng Li Jun , Yang Zhen , Ma Ji Miao , Yuan He Feng , Liu Feng , Wang Dong Ya
Published: January 2015

The tensile strength, elognation and microstructure of alloy are respectively tested and observed after annealing treatment. The results show that the working rate the larger, the initial recrystallization temperature the lesser. The proper middle annealing process of Cu-Ag alloy with 80% deformation is 405°C×5h.
Effects of Continuous Casting Mould Vibration Feeding Strip on the Slab Structure
Authors: Yu Lin Hui , Li Ji Dong , Shevchenko Anthony , Shen Ming Gang , Zhang Bao Guo , Wang Yi Yong
Published: January 2015

Continuous casting mold feeding steel strip is a new technology to improve the organization and the equiaxed crystal ratio of casting slab. It is researched in one Steel Mill taking low carbon steel Q235B, 250 * 1600mm billet as the research object. Effects of the vibration feeding steel strip on the slab structure and performance is studied. Results show that, porosity in the center of cast billet and macro segregation of dispersion decreased through the continuous casting mould vibration feeding steel strip technology, which can improve the quality of macro structure and reduce the chemical heterogeneity shaft direction to the regional and then improve the plasticity in thick rolling plate.
Effects of Heat Treatment Process on Mechanical Properties of X70 Grade Pipeline Steel Bends
Authors: Zhao Shi Lu , Zhang Zhen , Qu Lian Chong , Zhang Jun , Wang Jian Ming , Wang Shuang Hong
Published: January 2015

Effects of heat treatment process of quenching and tempering under different temperature conditions on mechanical properties of X70 grade pipeline steel bends were studied. Brinell hardness, yield strength, tensile strength, elongation and impact absorbing energy of the bends were tested by using hardness tester, cupping machine and impact testing machine, respectively. It shows that the best heat treatment process of the X70 grade pipeline steel bends is quenching at 890 °Cand thermal insulation for 26 min then water cooling followed by tempering at 590 °C and thermal insulation for 60 min then air cooling. Furthermore, the resulting hardness, yield strength, tensile strength, yield ratio, elongation and impact absorbing energy reach HB230, 595 MPa, 725 MPa, 0.82, 28% and 300 J respectively, which has excellent comprehensive mechanical properties.