bluuebunny/crossref_metadata_2025 huggingface dataset:
Synthesis & Evaluation of Antitubercular Activity of Novel Mannich Bases of imidazo[2,1-b][1,3,4]thiadiazoles
Authors: P.Badiger Naveen , Khazi I.M.
Published: September 2013

A series of 2-(4-methoxybenzyl)-6-aryl-5-pyrrolidin/piperidin/morpholin-1-ylmethyl-imidazo [2,1-[1,3, thiadiazoles (3a-e, 4a-e & 5a-e) were synthesized by Mannich reaction by condensing 2-(4-methoxybenzyl)-6-arylimidazo [2,1-[1,3,thiadiazoles with pyrrolidine, piperidine and morpholine. The title compounds were screened for antitubercular activity against Mycobacterium tuberculosis H37Rv using the BACTEC 460 radiometric assay. Mannich bases with pyrrolidine substitution were found to be most active antitubercular agents. It proves that as the ring size decreases it becomes much potent in its activity. Pyrrolidine being 5 membered ring structure & further combined with imidazothiadiazole nucleus enhances the pharmacological activity.
The Replacement of Refrigerating Unit Operation by Natural Air Cooling during the Winter and Relevant Transformation
Authors: Bao Xi Chun
Published: September 2013

This paper introduces the principle of heat transfer based on the surface cooler ,analyze the power consumption of cooling between surface cooler and refrigerating unit and the parameters of air-condition,redesign a set of energy conservation equipment, which is for air cooling during the winter, within the limitations of straight-flow ultra-low humidity air conditioning thermal load, local climate condition and relative information, and analyze the prospect of the replacement in this situation.
Corrosion Behaviors of 25CrMnVA Steel in CO2 Flooding Enhanced Oil Recovery System
Authors: Sun Chong , Sun Jian Bo , Wan Yong , Su Xin , Zhang Yong
Published: September 2013

Influences of temperature and CO2 partial pressure on CO2 corrosion behaviors of 25CrMnVA steel were investigated in the simulated oil field environments. The corrosion rates were measured under high temperature and high pressure condition. SEM, EDS and XRD were used to analyze the morphologies and characteristics of corrosion scales on the steels. The results shows that the corrosion rates of 25CrMnVA steel change little below 65°C, the corrosion feature is uniform corrosion. The corrosion rates increase rapidly after 65°C, mesa corrosion is found on the surface of steel. The corrosion rates decrease firstly and increase subsequently with the rising of CO2 partial pressure, and the minimal corrosion rate presents near CO2 critical pressure. The compactness of corrosion scale improves with the increase of CO2 partial pressure below 8MPa, which causes uniform corrosion rate reduced. Under supercritical CO2 condition, the local defects in the surface of corrosion scale increase, and the compactness of corrosion scale reduces,which cause the increase of corrosion rate sharply. The corrosion rate and corrosion morphology are closely related to the state of corrosion scale.
Short Term Wind Speed Forecast Revision Method Based on Volatility Characteristics and Confidence Level
Authors: Wang Shi Qian , Di Li , Huang Jing Hui , Tian Chun Zheng
Published: September 2013

Accurately forecasting short-term wind speed can effectively reduce the adverse effects of wind power in power systems and improve the competition of wind power in power markets. Because of the wind randomness, there are huge forecasting errors existing in those commonly used forecasting methods at wind mutation points, and through improving the forecasting method itself can merely provide positive effect. From the angle of revision, a new method is going to be proposed and applied to revise the forecasted wind speed in this paper, which is based on the historical data fluctuation characteristics and confidence level. Under this method, we can turn the original forecasted wind speed into the optimized wind speed. The revision method can be applied on all short-term wind forecast methods. The validity and feasibility of this method are going to be verified through a wind speed forecasting method based on the Grey model GM(1,1).
Study on Bioaugmention Technologies of Eutrophication Landscape Water
Authors: Yang Zong Zheng , Zhang Huan , Zhang De Qiang , Pang Jin Zhao
Published: September 2013

This inoculation method inputting photosynthetic bacteria, nitrifying bacteria, compound bacteria etc into the water, to degrade pollutants of the urban lakes in this paper. The results show that, the removal rates of organic substance, chlorophyll-a and nitrogen compounds were 60%, 90% and 50% respectively .Moreover, dissolved oxygen (DO) content increased from 1 to 7 mg/L by adding microbes. The conclusion can be drawn that its feasible for adding microbes into eutrophication water to decontaminate water.
Investigation of Micro-EDM Input Parameters on Various Outputs in Machining Ni-Ti Shape Memory Alloy Using Full Factorial Design
Authors: Rasheed Mohammed Sarvar , Abidi Mustufa H. , El-Tamimi Abdulaziz M. , Al-Ahmari A.M.
Published: September 2013

Micro Electric Discharge Machining (μ-EDM) is a non-traditional machining process which is used for drilling micro holes in a high strength-to-weight ratio advanced engineering materials like shape memory alloys that have many applications in the field of aerospace and medical sciences. However, in order to achieve the desired output responses the process control parameters of the machine have to be set at an optimal setting. In this research work, an investigation has been made to study the influence of the input parameters (such as capacitance, discharge voltage and electrode material) on the micro-EDM process output responses (such as MRR, TWR, Ra and circularity of the micro-holes) while drilling the micro-holes on Ni-Ti shape memory alloy. The full factorial design based study resulted in a set of recommended values for input variables to obtain the desired output. Mathematical predictive models have also been developed, which predict good values for the output responses.
Numerical Investigation on Bending Stiffnes of Several Composite Joints
Authors: Du Jun Min , Wang Tai Kun , Sun Juan Juan
Published: September 2013

With the weight-reduction requirement for transportation tools, more and more plastics and composite materials will be applied. However, the connection between plastics, polymer-based composite and traditional metal, such as steel or aluminum, possibly become the weakest region and thus decrease the structural safety, therefore, its mechanical properties should be investigated. In this paper, a typical single-lap joint was analyzed experimentally and numerically under the three-point-bending loads, and the results were compared and finite element model was updated. Based on the validated simulation technology, three other joints were simulated and all joints were compared, and suggestion for design of composite joints was provided.
New-Technique Drilling with Modulated Rotation Spindle Machine
Authors: Inoue Takashi , Hagino Masahiro , Kurita Yuuki , Watanabe Kimitoshi , Ueda Kazuya , Shimizu Yasumitu
Published: September 2013

In drilling deep holes with small-diameter tools in particular, chip shape is a major problem along with tool rigidity. In this study, we developed a spindle machine that has regularly repeating acceleration and deceleration regions in each drill rotation (called modulated rotation) as a new drilling spidle machine that can improve chip discharge ability. For an analysis of the cutting mechanism based on the basic principles of this device and its drilling characteristics, holes were drilled in CFRP, and Ti alloy (Ti-6A1-4V) materials using a straight shank drill. The relationship between the torque and thrust of cutting resistance force was obtained to show the relationship between cutting chips shape and cutting force. The characteristics of drilling with the developed spindle device were evaluated in comparison with regular drilling methods. It was found that the torque with this device was reduced by about 10% compared with general drilling. Outstanding chip breakup was seen with Titanium alloys in particular, as a result of which chip discharge could be improved.
Influence of Al2O3 as Filler Loading on the Fracture Toughness of Light-Cured Dental Resin Composites
Authors: Alsharif Saad Omar , Akil Hazizan Md , El-Aziz Nasser Abbas Abd , Ahmad Zainal Arifin Bin
Published: September 2013

The purpose of the present study was to evaluate the effect of filler loading on the fracture toughness of light-cured dental resin composites (DRCs). The monomer Bis-GMA and TEGDMA (75/25 wt/wt) were mixed with treated micro-sized aluminum oxide (Al2O3) particles ranging from 40-60 wt% as filler. The composite samples were cured with LED for 80s. The bulk density (g/cm3) and apparent porosity (%) of the samples were determined according to the ASTM standard. The fracture toughness (KIC) values of the composites were determined using a single edge notched specimen in the three-point bending test. There was a significant difference in KIC of the composites with different loading of Al2O3 particles (p < 0.05). The highest amount of filler (60 wt%) reduced the KIC value to 1.5 MPa.m1/2. As a conclusion, the Al2O3 particles used as filler loading does have an effect on the mechanical properties of DRCs.
Titania Nanotubes for Energy Applications
Authors: Menon Latika
Published: September 2013

Titania (or titanium dioxide) nanotubes are advanced materials with diverse functionalities. They have a variety of applications ranging from biology, food, cosmetics, energy and related areas. In this paper, we provide a brief description of electrochemical routes that may be used to synthesize such nanotubes rapidly over large areas. We also provide a brief overview of their energy-related.
Research on Vibration and Heat Transfer Characteristics of an Optimized Structure of Elastic Tube Bundle
Authors: Jiang Bo , Tian Mao Cheng , Cheng Lin
Published: September 2013

Combined with the structure and operating characteristics of the original type, an optimized structure of elastic tube bundle is proposed. The mechanical properties of the end region of the elastic tube bundle are derived theoretically, and researches are carried out on the vibration and heat transfer characteristics by adopting the method of combination of experiment and numerical simulation. The results show that there exist noticeable improvements for the optimized structure in the four aspects as follows: 1. the bending moment endured in the end section is only 0.159 times of the original tube bundle; 2. the natural frequency is lower than that of the original type; 3. the mean heat transfer coefficient of which is 26% higher than that of the original one; 4. the heat transfer area per unit volume increases by 24.7%. Furthermore, a comprehensive analysis is made on heat transfer performance improvement of the optimized structure
Study on the Friction Characteristic of a Water-Lubricated Hybrid Bearing
Authors: Xiong Xian Zhi , Xu Hua
Published: September 2013

In this paper, a water-lubricated hybrid with four stepped recess supporting a high-speed spindle system is studied. A two-dimension finite element method considering turbulence effect and the relationship between temperature and viscosity is developed to solve the Reynolds equation to obtain different bearing performance. This paper mainly discusses the influence of the water supply pressure, rotating speed, and load carrying capacity on the power loss, friction coefficient and temperature. The results presented in this study are expected to be useful for the design of water-lubricated hybrid bearing used to support high-speed spindles.
The Development and Research of the Special ELID Grinding Machine
Authors: Guan Jia Liang , Wang Zhi Wei , Zhu Li Li , Chen Zhi De , Wang Wen Chang
Published: September 2013

ELID grinding technology applied to difficult-to-machine materials’ precision and ultra-precision processing has obtained good results. Based on the existing experimental results of ELID grinding, according to the structure characteristics of the existing grinding machine, we designed and developed a special ELID grinding machine in order to greatly improve the machining precision and automation degree of the existing grinding machine and achieve precision and ultra-precision processing of difficult-to-machine materials.
Theoretical Model of Monitoring and Control Systemin Stage Hydraulic System
Authors: Dong Yue , Xu Li Li , Yang Qi , Wang Chun Zhi , Zhao Yu , Zhang Xin Xiang , Xu Liang
Published: September 2013

Hydraulic system has been used very widely in the modern stage system, through the hydraulic system of the stage, we can realize many function of the stage, such as lifting and revolve, and this makes the effect of the performance even better.[1] But the hydraulic stage system is relatively huge, failure is inevitable, and the causes of system failure are varied. In recent years, the casualties caused by the system are abounding. We can set up the mathematical model, to provide theoretical support for the monitoring and control system in the hydraulic system of the stage.
Study on Pressure Control Strategy for a Environmental Simulation System
Authors: Qu Hong Quan , Li Guo Xiang , Yang Jie , Pang Li Ping
Published: September 2013

A high-altitude multi-parameter environmental simulation system can simulate a high-altitude flying environment for aircraft on ground. It has a very important effect on researching aircraft Environment Control System (ECS) and testing its working performance. However, it is very difficult for a traditional experimental system to realize a pressure decoupling control in a real multi-parameter simulation because the pressure control is strongly coupling with the temperature and humidity control. Therefore, a multi-parameter environmental simulation experiment is not very fast and precise currently. In order to meet the high-altitude experimental requirements, it needs to develop a new experimental method and the corresponding strategy. In this paper, an experimental method is used and it controls the pressure in the environmental simulation cabin only by using an air exhaust valve. Further, a two-degree-of-freedom PID pressure control strategy with a nonlinear compensation is also presented to control the air exhaust valve. The control strategy can realize a pressure decoupling control from the temperature and humidity control. The nonlinear flow character of the air exhaust valve can be compensated by introducing a nonlinear compensation part and the pressure control overshoot can be overcome by the two-degree-of-freedom PID controller. Simulation results show that this presented control strategy can realize a real-time environmental control and improve the control precision and respond speed greatly.
Self-Erected Inverted Pendulum
Authors: Nasim Shahzad , Javeed M. , Shafiq M. , Liaquat Faraz , Ali Zain Anwar
Published: September 2013

The basic theme of this research paper is self-erecting the inverted pendulum by via ARDUINO controller and stabilizes the system through PID algorithm of linear control system. ARDUINO controller acquires the data from the sensors in terms of position and angle of the pendulum and commands the motor through PWM signal after that swing the pendulum from rest position to get and balance the inverted position. Controller read the pendulums angular position through potentiometer then calculates and removes errors via PID algorithm. MATLAB-Simulink and LABVIEW sent and receives runtime information from controller.
Research on the Liquid Level in Tin Bath Based on Application of Capacitance Sensor
Authors: Zhang Yao , Liu Xiao Ya
Published: September 2013

Based on the analysis of the production technology and present status of online glass coating production, a non-contact measurement capacitance sensor, which is adaptive to the high temperature condition and enjoys a novel structure, is proposed in the paper. The online measurement of molten tin surface position in the CVD coating production process under the condition of 700°C can be realized with the sensor. The reliability and feasibility of the dynamic measuring system have been proved by the experiment. The dynamic accuracy is better than 0.1mm within the effective range of 25mm.
Effect of Temperature on H2S/CO2 Corrosion Behaviors of P110-3Cr Steel
Authors: Su Xin , Sun Jian Bo , Sun Chong , Han Bin
Published: September 2013

Flowing solution environment containing H2S/CO2 was simulated by high temperature and high pressure autoclave. Corrosion behaviors of P110-3Cr pipeline steels were investigated by Weight loss, Scanning electron microscopy (SEM), X-Ray diffraction (XRD) and Energy dispersive spectrometer (EDS). Effect of temperature on corrosion rate and corrosion product was discussed. The results showed that corrosion rate of P110-3Cr steel decrease at the beginning and then increased with rising temperature. The corrosion types are general corrosion. P110-3Cr has resistance to local corrosion. Mackinawite (FeS0.9) is formed as corrosion product in low-temperature condition. With temperature increasing the corrosion products are dominated by mackinawite (FeS0.9) and Cubic iron sulfide (Fe3S4). When temperature increased to 150 ¡æ, the corrosion products are made up of Hexagonal iron sulfide (Fe0.96S) and Orthorhombic Marcasite (FeS2). No siderite (FeCO3) is detected, the corrosion is controlled by H2S; Cr is rich in the corrosion scale.
Water Depth Extraction in Minjiang Estuary Using Remotely Sensed TM Data
Authors: Ma Jiang , Zhu Shou Xian , Zeng Wen Hua , Zhang Wen Jing
Published: September 2013

Remote sensing provides explicit images covering Earth surface. Thus, remote sensing can be applied in water depth extraction. In this paper Minjiang Estuary has been chosen to be the study area for spectral analysis of correlation index between TM image and the water depth in charts. The result shows that in the whole single spectra TM3 provides the largest absolute correlation index and in other band ratios TM1/TM3 offers the larger absolute correlation index. Then TM3 and TM1/TM3 are applied in some models using linear, logarithmic, power exponential and exponential equations in pursuit of obtaining water depth inversion. Among these models, exponential model using TM3 is certified to be the best one.
An Advanced P2P Multicast Algorithm Based on Scribe
Authors: Wang Yan
Published: September 2013

This paper presents an advanced multicast algorithm to the question of low multicast efficiency and poor game states synchronization in the SCRIBE algorithm based on P2P for MMOG. This algorithm constructs a multicast tree mainly considering node heterogeneity on bandwidth resource, computing resource and storage resource, moreover it approximately balances multicast tree by looking for a sub-tree which its high is lower. The experiment results show this algorithm can reduce message redundancy and multicast delay to a greater extent, and greatly improve game state synchronization.
Crime Detection with ICA and Artificial Intelligent Approach
Authors: Junoh Ahmad Kadri , Mansor Muhammad Naufal , Ya'acob Alezar Mat , Adnan Farah Adibah , Saad Syafawati Ab. , Yazid Nornadia Mohd
Published: September 2013

The Rise of Crime in Malaysia reported that violent crimes comprised only 10% of reported crimes each year and the majority of crimes, 90%, were classified as property crimes. However, the ratio of police to population is 3.6 officers to 1,000 citizens in Malaysia. This lack of manpower sources ratios alone are not a comprehensive afford of crime fighting capabilities. Thus, we proposed an Artificial Intelligent Techniques to determine the behaviour of the burglar with Independent Component Analysis (ICA), Linear Discriminant Analysis (LDA) and k Nearest Neighbor (k-NN) Classifier. This system provided a good justification as a monitoring supplementary tool for the Malaysian police arm forced.
A Study of Simulation Model of Doubly-Fed Motor Based on Matlab/Simulink
Authors: Chen Xian Biao
Published: September 2013

This paper introduces the characteristics of doubly-fed motor. The mathematical model in the two-phase synchronous rotating coordinate system d-q of doubly-fed motor is given, and a simulation model is constructed by Matlab S-function based on the model. Simulation of doubly-fed motor on stator unity power factor vector control is carried out through the model and simulating waveforms are given. The simulation results illustrate that the doubly-fed motor simulation model by S-function has the characteristics of simple, fast and high precision. It provides a convenient pathway for the research of doubly-fed speed regulation system.
Complex Method in Kinematic Analyses of a Mechanism
Authors: Wang Lin , Shi Wen Pu
Published: September 2013

Complex analytical method is employed to study the motion of a kind of mechanism. The angular velocities and the angular accelerations of the connecting rod and the rocker are deduced. The motion trajectory and linear velocity of a key point are also given. The results of the given example show the feasibility and the effectiveness of the method and conclusions here.
Kinetics of Photochemical Oxidation of Glucose by Chloramine-T in Acidic Medium: A Mechanistic Approach
Authors: Wadhwani Meena , Jain Shubha
Published: September 2013

A simple, convenient and accurate method for the kinetic study of photochemical oxidation of glucose by chloramine-T in acidic medium is described. The kinetic investigation shows the first order dependence of reaction rate on chloramine-T. With excess concentration of other reactants the reaction rate follows fractional order kinetics with respect to substrate. The reaction is catalyzed by H+ ions as well. A small salt effect and increase in reaction rate with increasing the intensity of light source is also observed. Addition of p-toluene sulphonamide retards the reaction rate. A suitable mechanism in agreement with observed kinetics has been proposed
Micro-Shear Properties of Welded Joints of ASTM4130 Steel
Authors: He Qing Kun , Sun Chong
Published: September 2013

The effect of soaking time and temperature of post weld heat treatment on the micro-properties of the welded joints of ASTM4130 steel was investigated by using micro-shear test. The results show that micro-shear test can be adopted to evaluate the mechanical properties of uneven materials such as the welded joint. The micro-strength of the weld, fusion line and base metal is not obviously affected by the soaking time. The width and strength loss of the softened zone slightly decrease with increasing soaking time. The micro-shear strength of the weld firstly decreases and then significantly increases with increasing PWHT temperature. But the BM shows the opposite trend. The width and strength loss of the softened zone are not obviously affected by PWHT temperature. At PWHT temperature of 590 °C, the width of softened zone and the strength loss rate are the largest. In terms of hardness, width and degree of the softened and toughness, 640°C/165min PWHT is preferred.
Based on Object-Oriented Centrifugal Pump CAPP System
Authors: Li Ke Wang , Li Qiang , Niu Xing Hua , Zhang Zhen Tao
Published: September 2013

This paper introduces an industrial pump CAPP system which is based on feature modeling development and object-oriented technology. Establishing product expression of the characteristics at different levels; discussing the implementation of an object-oriented mechanism, expression of characteristics and design method; achieving the information exchange of system between the characteristics object models and database.
Design on Elevate Mechanism of Large-Scale Multi-Stage Direct-Acting Hydraulic Hoist
Authors: Luo Jing , Liu Xue Chun
Published: September 2013

For the requirements of volume of cage, load and lifting height, Elevate mechanism of large-scale multi-stage direct-acting hydraulic hoist are adopted when construction hoist lifts material and staff in high-rise construction. Multi-stage expansion of hydraulic cylinder can cause towing oil pipe frequently. Friction and wear between oil pipe and framework is appeared, and oil pipe bursting is occurred. It directly influences both the constructing progress and safety operation. With the ingenious design of hydraulic cylinder and pipe connecting mode, oil pipe towing is avoided telescoping hydraulic cylinder. It provides a new way in other connecting mode of hydraulic system.
Simultaneous Optimization of Ge Doping Profile and Layout in Multi-Finger Power SiGe HBTs for High Thermal Stability
Authors: Hua R.X. , Jin D.Y. , Zhang W.R. , Lu D. , Fu Q. , Zhu X.F.
Published: September 2013

Considering the effect of electro-thermal feedback on the thermal stability of multi-finger power SiGe HBT, optimization of SiGe HBT on both Ge doping profile (electrical aspect) and layout (thermal aspect) is demonstrated in this paper. A novel stepped Ge doping profile of SiGe HBT with a grading Ge concentration in base region is proposed to improve the temperature coefficient of current gain, meanwhile, the cut-off frequency of HBT is also increased considerably due to the accelerated electric field caused by the Ge concentration grading. However, there is still an uneven temperature distribution. Therefore, the layout of multi-finger HBT with nun-uniform emitter finger length is optimized to compensate the thermal coupling effects and hence the uneven temperature distribution is improved obviously. It is shown that the device with simultaneous optimization of Ge doping profile and layout could be in thermal stability over a wide temperature range, which presents useful guideline to design microwave power HBTs.
Kinematic Analysis of a Novel 3-DOF Parallel Mechanism with Actuation Redundancy
Authors: Niu Xue Mei , Gao Guo Qin , Bao Zhi Da
Published: September 2013

Kinematic analysis plays an important role in the research of parallel kinematic mechanism. This paper addresses a novel forward kinematic solution based on RBF neural network for a novel 2PRRR-PPRR redundantly actuated parallel mechanism. Simulation results illustrate the validity and feasibility of the kinematic analysis method.
Analysis of the Motion of Shipboard Missiles under the Excitation of Sea Waves
Authors: Wang Yun Long , Lv Wei Min , Feng Jia Chen , Jin Yong Chuan
Published: September 2013

Waves in different sea conditions are simulated by the Bretscheider double parameters spectrum using randomly chosen discrete frequencies as its parameters. Ship motion model of six degrees of freedom is established under the Ship coordinates system. As the ship system is linear, the ship motion under irregular waves can be calculated through the amplitude-frequency response function obtained by solving the model when the input is the superposition of regular waves. Finally according to the coordinate transformation between the ship coordinates system and the missile coordinates system, the motion of the shipboard missiles under excitation of sea waves can be analyzed to support the environmental analysis of its combat duty process.
Auction-Based Resource Allocation in Computational Grids
Authors: Ding Li Li , Wang Zheng Wei , Wang Xiao Ling
Published: September 2013

Auction techniques have been becoming the key methods in grid resource allocation. In this paper, we propose the multi-attribute reverse auction models for computational grid resource based on the designed satisfaction degree function. The fairness is also introduced into the models and protocols to match the reality. Two auction-based protocols are presented, i.e., the offline multi-attribute auction-based protocol and the on-line multi-attribute auction-based protocol. The goal is to help the resource user make multi-attribute decisions with complete information or incomplete information. Results from simulation experiments show that these two protocols can achieve market efficiency and fairness in most instances.
Simulation Analysis of High Strength Thrust Bearing Shell
Authors: Huang Bing Yang , Wang Huan Jie
Published: September 2013

Based on main structural features of the high strength thrust bearing shells, ANSYS has been applied, in this paper, to establish a finite element model and simulate the combined stress and deformation of the high strength thrust bearing shells and connecting bolts between them.
Simulation results show that strength of high strength thrust bearing shell and the connecting bolts between the shells can meet the design requirement of the structure form with heavy thrust load and high strength.
A Novel Quantum Genetic Algorithm for Continuous Function Optimization
Authors: Li Hao , Li Shi Yong
Published: September 2013

In this paper, a novel quantum genetic algorithm is proposed. This algorithm compares the probability expectation of the quantum chromosome with the best binary solution to determine rotation angle of rotation gate. Different individual in population evolve with different rate to complete local search and global search simultaneously. Hε gate is used to prevent the algorithm from premature convergence. After analyzing the algorithm and its global convergence, applying this approach to the optimization of function extremum, and comparing with the simple genetic algorithm and the quantum genetic algorithm, the simulation result illustrates that the algorithm has the characteristic of quick convergence speed and high solution precision.
IT Architecture Evaluation of Telecommunication Company Using Analytical Hierarchy Process
Authors: Gou Ru Xin , Lu Ting Jie
Published: September 2013

Information systems had been built to meet the requirement of enterprise operations, But the ever-changing market environment leads to unceasing adjustment on enterprise goals, organization structure, business processes of telecommunication companies .The IT architecture should also be adjusted to meet the requirements of enterprise operations. This paper try to investigate on the method of build an evaluation model on IT architecture of a telecommunication company using Analytical Hierarchy Process (AHP). The evaluation of the IT architecture is based on a number of criteria (e.g. Completeness, effectiveness, compliance), Measurements need human judgments to estimate their importance and from that importance to develop order and measures priorities, but the pertinent data are difficult to be quantified. The Analytic Hierarchy Process (AHP) is an effective approach in dealing with this kind of decision problems. Based on experiential knowledge and also by the views of several experts, we can construct a hierarchy model for the evaluation, and a well researched methodology has been adopted for the synthesis of priorities and the measurement of consistencies.
Study on the Cooperative Learning in the Teaching of Civil Engineering
Authors: Zhang Jin Tuan
Published: September 2013

At present, in the field of education, there are more and more attention have been paid on the theory and practice of the autonomous and cooperative learning. The implementation of the cooperative learning mode has been in-depth studied, so as the role of teachers. By defining the conception of autonomous and cooperative learning, we combined it with the characteristics of civil engineering course to study the use in the civil engineering course. The application of cooperative learning in the teaching of civil engineering is necessary, and the result is also significant.
Communication Module of 3D Camera Pan Tilt Zoom
Authors: Dong Yue , Yang Zhuo Min , Xiao Huai Yu , Zhao Yu , Wang Chun Zhi , Cai Fang Wei , Xu Liang
Published: September 2013

The purpose of this selected topic is for researching and designing a 3D TV high-precision camera PTZ (Pan/Tilt/Zoom) in order to have the functions of Remote double machine level shift, ticket reservation in any angle rotation.In this communication module design, NEC encoding infrared remote control decoding chip is used as a source for the remote control signal to make it possible for a photographer, within 5 meters ,to send the infrared signal to the integration of the infrared receiving head. The Infrared signals contain such information as the stepper motor direction, the rotating ring number and the working state.
An Insight into the Analytical Models of Granular Particle Damping
Authors: Wang D.Q. , Wu C.J. , Yang R.C.
Published: September 2013

Granular particle damping technique is a means for achieving high structural damping by the use of metal particles filled into an enclosure which is attached to the structure in a region of high vibration levels. The particle dampers are now preferred over traditional dampers due to the stability, robustness, cost effectiveness and the lower noise level than the impact damper. Such a promising technique has been used successfully in many fields over the past 20 years. In this paper, a state-of-art review on the development of modeling for particle damping is presented. The fundamentals and individual features of three main mathematical models of the granular particle damping are briefly summarized, i.e. the lumped mass model, the Discrete Element Method (DEM) and the approach based on the multiphase flow (MPF) theory of gas-particle. It is worth noting that an improved analytical model of the particle damping based on MPF theory is also introduced. The co-simulation of the COMSOL Multiphysics live link for MATLAB is conducted using this improved model. It can be shown that this model makes the complicated modeling problem more simply and offers the possibility to analyze the more complex particle-damping vibrating system.
The Research on Modular Adaptable Design Platform for Non-Standard Waste Detection Equipment
Authors: Cheng Bing , Wang Tai Yong , Xiao Xin Hua
Published: September 2013

The design of non-standard waste detection equipment costs much manpower and material resources. The company need reduce unnecessary duplication of work to respond quickly to market needs. The equipment can be designed on the modular adaptable design platform. The function analysis of waste detection equipment brings the base type of product. Modules are the basic units in product design on the platform. A new product can be quickly designed based on the base type by reconfiguring, upgrading general modules and replacing special modules on the platform.
Approach to Weak Signal Extraction Based on Empirical Mode Decomposition and Stochastic Resonance
Authors: Zhang Pan , Wang Tai Yong , Liu Lu , Jin Lu Yang , Fang Jin Xiang
Published: September 2013

The empirical mode decomposition (EMD) of weak signals submerged in a heavy noise was conducted and a method of stochastic resonance (SR) used for noisy EMD was presented. This method used SR as pre-treatment of EMD to remove noise and detect weak signals. The experiment result prove that this method, compared with that using EMD directly, not only improve SNR, enhance weak signals, but also improve the decomposition performance and reduce the decomposition layers.
Approach to Extraction of Incipient Fault Features on Unstable Rotating Rolling Bearings Based on Time-Frequency Order Tracking and SPWVD
Authors: Song Long Long , Song De Gang , Cheng Wei Dong , Wang Tai Yong , Su Kai Kai
Published: September 2013

Frequency-smear phenomenon caused by fierce rotating speed variation made it difficult to extract the fault features of the rolling bearing. An approach based on time-frequency order tracking and SPWVD was proposed in this paper. The influence of speed variation was reduced by resampling the time-domain non-stationary signal at constant angle increments with order tracking analysis. The precision of instantaneous frequency estimation (IFE) in time-frequency order tracking was improved by the use of Smoothed Pseudo Wigner-Ville Distribution (SPWVD). The simulation signal and experiment on test-rig revealed that the proposed method was more effective than the traditional order tracking in clarifying incipient fault.
The Design of IPC Chassis Structure Based on CNC System
Authors: Liang Ruo Yu , Chen Dong Xiang , Wang Tai Yong , Wu Kai Fa , Lin Fu Xun , Li Yi Chao , Xu Xiao Feng
Published: September 2013

The article introduces the new technologies and methods in chassis of IPC design. It elaborates the process from following four parts: electromagnetic shielding, anti-libration and anti-impact design, thermal design and other protective design. The last part summarizes the design procedure and looks ahead to the future of this field.
Method of Plugging Cylinder Selection for Leak Detection Equipment Design Based on Differential Pressure Decay
Authors: Xiao Xin Hua , Wang Tai Yong , Cheng Bing
Published: September 2013

In auto leak detection equipment based on differential pressure decay, plugging quality directly impact on its accuracy and reliability. Since the cylinder is usually used to provide plugging force, plugging cylinder selection is an important part the detection equipment design. The main mechanical structure of the detection equipment was described. The equilibrium equations of plug were established and the bore size calculation formulas were derived in line seal and in face seal. To acquire the parameters such as circumference, area, etc. of the irregular seal surface, the subsection curve fitting-integration method and distilling from CAD model method were studied.
Machined NURBS Surface Description Using On-Machine Probing Data
Authors: Lai Jin Tao , Yao Xin Hua , Yu Wen Li , Fu Jian Zhong
Published: September 2013

The error distribution of a machined NURBS surface is complex to describe since the machined surface isnt that easy to obtain. A new method for machined NURBS surface description based on inspection database of on-machine probing is presented. The main idea is to approximate the machined surface using the inspection data and the basis functions of the nominal NURBS surface and to get the error distribution of the surface. A virtual part with a NURBS surface is presented and its error caused by the interaction of the machine-tool-workpiece is obtained using the FEA method at the inspection points. A machined NURBS surface is achieved and the error distribution of the surface is expressed. This method provides a new way in error compensation and it will improve the machining accuracy of a NURBS surface.
Research on Coverage Path Planning of Mobile Robot Based on Genetic Algorithm
Authors: Deng San Peng , Wang Zhong Min , Zhou Peng , Wu Hong Bing
Published: September 2013

This paper presents a complete coverage path planning method, which combines local space coverage with global motion planning. It is realized by modeling mobile robot environment based on Boustrophedon cell decomposition method; and according to the characteristics of regional environment model, the connectivity of the traversing space is represented by a complete weighted connected matrix. Then Genetic algorithm (GA) is used to optimize the subspace traversal distance to obtain the shortest global traversal sequence of mobile robot.
Five-Axis NC Simulating Manufacturing of Titanium Alloy Integral Impeller
Authors: Wang Chao Tai , Zhang Jian Ping
Published: September 2013

In this study, technological difficulties of machining titanium alloy impeller were analyzed. Furthermore, machining process of a certain impeller was illustrated as an example. Firstly, the impeller model was built through UG software. Secondly, the virtual simulation software was utilized to achieve simulating machining of the titanium alloy impeller, simulate cutting trajectory of cutters, motion of the machine tool, and so on. Finally, all machining parameters were optimized.
Experimental Study of Assembly Stress Based on Manufacturing Characteristics
Authors: Chen Jian Feng , Jin Xin , Zhang Zhi Jing
Published: September 2013

Assembly stress exists in mechanical equipment and instrumentation widely. Especially for precision mechanical systems, assembly stress may influence the system accuracy and performance. In this paper, taking form error and assembly force into account, the assembly stress and deformation were studied. By employing numerical simulation technology, the contact state of the part combining surface and additional deformational error were obtained, and an experiment was performed to verify the simulation calculation.
The Secondary Development of Milling Forces Simulation System of Ball End Mill Based on UG
Authors: Ding Yun Peng , Liu Xian Li , Zhou X.Y. , Shi Hui Nan , Li Jiao , Zhang Rui
Published: September 2013

Milling forces simulation is a critical part in the NC processing simulation system, unstable milling forces not only affect tool life, but also can reduce the surface machining quality. Based on the existing milling forces model of ball end mill, this paper establishes a milling forces simulation system which makes seamless integration of geometric simulation and physics simulation come true on UG platform with Matlab and VC++ mixed programming technique.
Effect of Making Technology on Properties of Ni/TiO2/PAn Particles ER Fluid
Authors: Tan Suo Kui , Song Xiao Ping , Hu Lian Ka , Guo Hong Yan , Ji Song , Zhao Hong , Fei Liang Jun , Wu Min
Published: September 2013

This paper emphasis has researched the effect of particles scattering, surrounding thickness, heat treatment temperature and etc on microstructure, mechanics properties and macrostructure under different electric field of Ni/TiO2, Ni/TiO2/PAn Particles ER fluid, It is found that particles scattering, surrounding thickness, heat treatment temperature have major effect on shear stress and chain of particles.
Molecular Dynamics Simulation Study of Grinding Process of Mg-Al Alloy
Authors: Li Cai Xia , Luo Yu
Published: September 2013

A molecular dynamics simulation considered of chip deformation and force analysis for grinding process of Mg-Al alloy is presented. Hybrid potentials including embedded atom method (EAM) potential and Morse potential are applied in this model. The activities among atoms of Mg-Al Alloy material is described by EAM potential which is very suitable for metal materials. Morse potential is used to realize the interaction between Mg-Al alloy and abrasive grain made of diamond. Simulations of Different depths of cut (0.6nm, 0.8nm and 1.0nm) and different cut speeds (50m/s, 100m/s and 200m/s) are given. The experience result shows that with the same nanometric depth of cut, there is a little difference of ratio of the cut potential to the cutting speed. Moreover, with the same cutting speed, the cut potential is increased linearly with the depth of cut while reaching to stable cutting regime.
Practical Method for Estimating Corrosion Depth of Uncoated Carbon Steel Using Thickness of the Corrosion-Product Layer
Authors: Kainuma Shigenobu , Yamamoto Yuya , Hayashi Hideyuki , Ito Yoshihiro
Published: September 2013

The corrosion environments of individual parts of members in a steel structure vary significantly. Therefore, efficient maintenance requires accurately evaluating these environments and predicting corrosion damage over time. This research focused on comprehensively evaluating the corrosive environment of each part of members in the structures based on the mean corrosion depth of uncoated steel plates mounted on the members. Atmospheric exposure tests were conducted in four exposure fields in which the environments varied widely as a function of rainfall and airborne sea salt. Based on the test results, a practical method of estimating the mean corrosion depth using the thickness of the corrosion-product layer on the mounted plates that does not require removal of the corrosion product is proposed. Furthermore, a method for estimating the time-dependence of corrosion depth for parts of the members after deterioration of the paint coating is proposed.
Fatigue Performance of Copper Alloys in Seawater Environment
Authors: Aufrecht Jochen , Drach Andrew , Grohbauer Adolf , Hofmann Uwe , Theobald Stefan , Tsukrov Igor
Published: September 2013

Corrosion fatigue performance of two copper alloys (admiralty brass and cupronickel 90/10) is investigated by conducting fatigue tests in artificial seawater. Two different experimental setups are developed and used: immersed rotating beam bending of round wires and immersed flexural cycling of rectangular plates. For the second setup, two sets of specimens are used: as-manufactured and after 1-year exposure to natural seawater in North Atlantic. In addition, the fatigue performance is compared between the dry and immersed tests. It is observed that the fatigue life of copper alloys in seawater environment depends on their composition and manufacturing parameters. Immersion in seawater does not affect low-cycle fatigue, however, high-cycle fatigue behavior shows significant differences. It is also observed that one-year preliminary exposure to natural seawater (stress-free corrosion) results in up to three times reduction of fatigue life at stress amplitudes corresponding to high-cycle fatigue.
Balanced Energy Dissipation at Propagating Crack Tip in Quasi-Brittle Materials? - Analysis via Soft-Computing Methods
Authors: Veselý Václav , Frantík Petr , Sagar R. Vidya , Štafa Michal , Pail T.
Published: September 2013

Analysis on the aspects of the energy dissipation in the case of quasi-brittle fracture is presented. Dissipation both via cohesive forces at the crack faces and the one taking place within the volume of the fracture process zone is considered. Tools from the field of soft computing techniques are employed. The analysis is conducted on results from extensive experimental campaign.
Finite Element Analysis of the Mechanical Behaviour of the Different Cemented Hip Femoral Prostheses
Authors: Bouziane Mohamed Mokhtar , Benbarek Smail , Tabeti S.M.H. , Bachir Bouiadjra Bel Abbès , Serier B. , Achour T.
Published: September 2013

The designs of cemented hip femoral stems have an influence on both the quality of the metalbone cement contact and the failure rate of the cement mantle. Finite element stress technique has been used to optimize both design and material selection in load-bearing components in artificial hip joints based on the static load analysis, by selecting the peak load during the patient activity. In this study, two stem shapes (Ceraver Osteal and Charnley stems) for total hip arthoplasty (THA) were modelled. Static behaviour of these designed stem shapes were analyzed using commercial finite element analysis code ABAQUS. Linear elastic analysis is adapted; Von Mises stress and shear stress are the criterions that are of concern. Results show that, the stresses distribution in the femoral arthroplasty components depends on the material and design of the stem. In addition, the cement-bone and cement-stem interfaces seem to be crucial for the success of the hip replacement, hip prosthesis with Charnely stem induces the more stresses on the interfaces cement.
Modeling Fatigue Damage of Concrete
Authors: Pryl Dobromil , Mikolášková Jitka , Pukl Radomír
Published: September 2013

Numerical model for fatigue crack propagation within the framework of finite element smeared crack analysis is presented. It concentrates on modeling of fatigue behavior of material under tensile load which causes initiation and growth of cracks in concrete. The fatigue material model is an extension of existing static three-dimensional fracture-plastic material model, and as such it has been implemented into the ATENA Finite Element software package. The developed model has been used to model experiments with high-cycle loading of three point bending concrete specimens tested by collaborating institutions. Analysis results are compared to the measurements.
Experimental and Numerical Investigation of Delamination in Curved-Beam Multidirectional Laminated Composite Specimen
Authors: Michel Laurent , Garcia Sebastian , Yao Chen , Espinosa Christine , Lachaud Frédéric
Published: September 2013

Composite corners are generally tested under four point-bending to identify Inter-Laminar Tensile Strength design values. Hereafter several lay-ups have been defined in order to characterize very different damage evolution processes. Damage monitoring has been performed with the help of Digital Image Correlation, Acoustic Emission and Fast Video Recorder. The different processes leading to final failures have been identified. A deterministic continuous composite material model is used to investigate these phenomena. Initiation and evolution up to saturation and fracture are implemented for various damage mechanisms and for delamination. A first comparison between experiments and numerical simulations is presented.