bluuebunny/crossref_metadata_2025 huggingface dataset:
A Portable Weather Station Design Applied in the Smart City
Authors: Liu Ren Jun , Ge Zhuo Chen , Lin Cheng Fan
Published: September 2013

A portable weather station which is a special made device could get current weather data and contact with the server is proposed. The device could make the weather forecast much more accuracy with the data from the weather forecast and current measurement. The humility sensor, pressure sensor, temperature sensor, GPS module and GPRS module are included in the device. With the GPRS network, the device could connect to server though the internet at any time to upload and download the weather documents. Also, government officials can access the data on the website to manage the current weather data and analysis the weather report on the website. Furthermore, this device could offer weather forecast which meets the special needs for the people in the remote or mountain area.
An Algorithm to Detect Noised Pixel in Image
Authors: Zhang Rui Dong , Hua Xing Xia , Chen Hai Ning , Xu Zhong Bing
Published: September 2013

In this paper, aim to salt and pepper noise, a new detect algorithm is proposed. GA-BPN algorithm uses Genetic Algorithm (GA) to decide weights in a Back Propagation neural Network (BPN)(GA-BPN).In this paper, we used Genetic Algorithm Back Propagation neural Network GA-BPN to do image noise detect work. Firstly, this paper uses training samples to train a GA-BPN as noise detector. Then, we utilize the well-trained GA-BPN to recognize noise pixels in target image. Experiment data shows that this algorithm has good performance.
Tollerance Coefficients of Stability in Linear Dynamic System Calculated in Matlab Environment
Authors: Halenar Robert
Published: September 2013

By the influence of changes in ambient parameters and operating conditions and changing parameter values LDS is changing their properties (behavior), reflected also in changes in characteristics, it is also possible to formulate an opposite role: "To what extent can be changed system parameters, to reached its behavior (under certain criteria) remained preserved ? " The answer to this question deals with the task of determining allowable changes - tolerance parameters for the desired behavior. Criteria for the behavior may be different. We will build on the stability criteria by Routh - Schur. Methodology makes use of computer simulation of classical mathematical analysis.
Design and Calculation of the Cam Mechanism Profile Curve Based on MATLAB
Authors: Liang Sheng Long
Published: September 2013

This paper discusses the design and calculation thinking of the cam mechanism profile curve, using MATLAB method, programmed the design and calculation of the cam mechanism profile curve , solved the large amount and complicated calculation data processing in design of the cam mechanism profile curve. Provided a practical calculation method of the cam design to the factory.
A Healthcare Service System Based on Internet of Things
Authors: Xiao Zheng Rong , Lv Bang Guo , Wang Xin , Zhao You Jun
Published: September 2013

With the development of networking technology and cloud computing technology, low-cost, high level of general practitioners of public health services and basic health service support, as well as the effective supervision of the centralized management and control of public health and primary health care can be achieved. A health cloud service system based on Internet of Things is provided, which is divided into six modules. The system can be used to subordinate all hospitals and medical institutions to provide hospital management and health of residents file management application services using a mobile terminal to collect community and clinical health data entry, upload the community, the region's public medical health data.
Establishment of E-Cooperative-Research-and-Development-Work Platform for Knowledge Alliance
Authors: Zhang Shao Jie , Ma Qiang
Published: September 2013

With the development of information technology, the mode of manufacturing R&D was heading for internet-based, integrated and globalized direction, which makes it more difficult and complicated for product R&D of knowledge management and collaboration in alliance under internet environment. Through a research on knowledge management system and platform, this paper establishes a cooperative-research-and-development-network platform for knowledge alliance under the internet environment, and apply the cooperative-work platform into practice of product H.
Magnetic Suspension Research and Design of Real-Time Display Based on the Internet of Things
Authors: Sun Ning , Wang Wei Liang , Xu Chao
Published: September 2013

Focus on poor dynamic of magnetic levitation control,the maglev real-time information display system was designed.This system was made of magnetic base,STM32 controller,maglev display.Aim at defects and poor of the suspension stability control and anti-disturbance ability,bulid the model of the system,the fuzzy PID integrated control solution was implemented in STM32 controller,to achieve control of magnetic screen.And give control system hardware construct and software flow. Experimental testing results show that the system has good stability and dynamic performance.
Research on Business Process Management System Based on SOA
Authors: Geng Jun Cheng , Ma Jian Wei
Published: September 2013

Business process management (BPM) is considered to be an effective way to improve their business agility for the enterprises. But after analysis, it found that the existing BPM system has been difficult to meet the needs of enterprises development. It analyzed the theory and technology of Service-Oriented Architecture (SOA) and BPM, and presented the BPM system solution based on SOA. Finally, it took case with a process improvement, which described the process of implementing a BPM system based on SOA. Practice has proved that the combination of SOA and BPM can greatly improve the business agility.
Dynamic Simulation of Small Crawler Chassis Turning Based on RecurDyn
Authors: Yang Huai Feng , Lv Xiao Rong
Published: September 2013

A multi-body dynamics model and ground model of a small crawler chassis was built on software RecurDyn/Track (LM). The simulations of the small crawler chassis turning on hard and soft terrain are implemented respectively, and the results are analyzed and compared. The steering properties of crawler chassis turning on soft terrain are emphasized. The simulation results can provide some theoretical guidance for crawler chassis steering performance.
Seamless Safe Supervision System of Edible Agricultural Products
Authors: Zhang Shu Hai
Published: September 2013

In order to resolve the gap in domestic Edible agricultural products safety supervising and decline the probability of Edible agricultural products accidents, this paper puts forward seamless theory and related information sharing theory to construct information sharing platform for seamless supervising of Edible agricultural products safety. Firstly, analyzes the significance of domestic Edible agricultural products safety and the current study situation of Edible agricultural products information platform. Through the analysis of the responsibilities of Edible agricultural products safety supervising department and according to the characteristics of seamless theory and the requirements of information sharing, puts forward the targets and contents of constructing information sharing platform for seamless supervising of Edible agricultural products safety, and designed the functional module and service items of information sharing platform for seamless supervising of Edible agricultural products safety.
Measuring the Satisfaction of Implementing Assistive Input Devices for Disabled People with InLinPreRa
Authors: Shih Ching Tien , Hsu Shu Chen
Published: September 2013

This study applies the Incomplete Linguistic Preference Relations (InLinPreRa) analytical framework to measuring the satisfaction of Assistive Input Devices (AID) for disabled people implementation as well as to verify the feasibility of this proposed approach. The main objective of this study is helping the organizations become aware of the essential factors affecting the AIDs for disabled people, and identifying the actions necessary before implementing AIDs for disabled people. Then predicted success/failure values are obtained to enable organizations to decide whether to initiate AIDs for disabled people, inhibit adoption or take remedial actions to increase the possibility of a satisfaction AIDs for disabled people.
An Optimization Design Method for the Acceleration and Deceleration Curves of Detachable Ropeway
Authors: Gu Xiao Long , Xiang Dong , Huang Peng Zhi , Li Yue Xiu
Published: September 2013

It will influence the comfort and safety of passengers when the cabins accelerating and decelerating in the detachable ropeway station. A dynamic model was built for the acceleration and deceleration process of detachable ropeway. And the optimal S acceleration and deceleration curves were designed. Then a physical model of detachable ropeway was built and imported into Adams to make a motion simulation. In order to ensure a small swinging angle when the cabins accelerating or decelerating to a constant velocity, it was compared with the swinging angle and swing in the condition of uniform acceleration and uniform deceleration. And the swinging angle and swing were reduced clearly in the condition of S acceleration and deceleration curves. It can greatly improve the comfort and safety of passengers under the S acceleration and deceleration curves.
Research on the Recycling Question of Electronics Manufacturers Implementing EPR Based on Differences in Consumer Demand
Authors: Kong Zhen Huan , Wang Yu Yan
Published: September 2013

According to consumer different preferences for new products and recycled products, considered on the differences in product demand, the recycling question of electronics manufacturers implementing EPR is studied in this paper. Firstly, the recovery rate of electronics manufacturers under the unconstraint of EPR is studied. Then, a reasonable recovery rate under the constraint of EPR is analyzed. The study shows that a reasonable recovery rate under the constraint of EPR should be constraints in the range between that electronics manufacturers actively implemented and forced to treat EPR. And the production costs is higher, the recycled goods costs is lower, and the waste products recycling difficulty is smaller, which reasonable recovery should be ordered greater. Finally, the policy and recommendations for implementation of EPR is given which EPR should be Implement sub-period phases and sub-enterprises.
Precision of Weights in Weapon Estimating
Authors: Xie Zhi Jian , Yu Cheng Bo
Published: September 2013

the optimal solution of weights can be solved through the mathematical programming model. The precision of weapon estimating can be improved via substitution of the solution for the subjective or objective weights which are regularly used in system estimate methods.
Analysis of NPD Performance Based on a Meta-Analysis and Structural Equations Modeling Examination
Authors: Gao Peng Bin , Wu Wei Wei , Yu Bo
Published: September 2013

The structure dimensions and the interactions of new product development performance have stimulated debate lasting many years. To synthesize accumulating research findings, meta-analytic structural equation modeling was employed. Product advantage, time efficiency, cost efficiency and product success were used to measure the performance based on past literature. The correlation matrix of four performance variables was included in the meta-analysis based on 44 studies. The results of structural equations modeling show that the one-factor model is proposed as best-fitting alternative model of NPD performance, and the internal performance including product advantage, time and cost efficiency variables are positively associated with external performance.
Quantitative Study on the Risk Level of Human Factor for Drilling Process
Authors: Zhou Ai Tao , Wang Kai , Zhang Hong
Published: September 2013

In order to quantifying human factor initial risk level in drilling process, the types of work activities involved in drilling were identified, the major accident risk types of human errors were selected, the probability and severity levels of risks associated with each activity were quantified, and the human factor risk level of major work activities involved in drilling process were calculated. Quantitative results show that the relatively highest risk types during drilling process are struck by object (risk value is 3.9171 S/w-h), injury by machine (risk value is 2.8916 S/w-h), overexertion (risk value is 1.5091 S/w-h), etc. Contrarily, the relatively lowest risk types are exposure to harmful substances or environments (0.7379 S/w-h), fire and explosion (0.2750S/w-h), and othersi0.2261 S/w-h), etc. The relatively highest risk activities are associated with penetration drilling (risk value is 2.7475S/w-h), trip in and out (risk value is 2.0206 S/w-h), and hoisting and lifting operation (risk value is 1.7064 S/w-h), etc. Contrarily, the relatively lowest risk activities are auxiliary operations (risk value is 0.3706S/w-h), well logging and mud logging (risk value is 0.2059 S/w-h), equipment inspection and maintenance (risk value is 0.1510 S/w-h), etc. The total risk value of all main drilling activities is 11.3947 S/w-h.
Simulation and Analysis of Rail Eddy Current Brake System of High-Speed Train
Authors: Wu Meng Ling , Zhang Xiang Jun , Tian Chun , Lu Xiao Shan
Published: September 2013

The paper used theoretical analysis and simulated method to study eddy current brake force and temperature rise which are two of the most concerned questions about rail eddy current brake. The simulation of brake force coincided with theoretical analysis to prove it reasonable. The simulation of temperature rise simplified the process of modeling and calculating, which could be significant to further research about the eddy current brake. It is concluded that how the brake force and temperature rise changed with the train's velocity increasing.
Vibration Simulations of Double-Walled Carbon Nanotubes by Finite Element Method
Authors: Jia Yu , Chen Li Jie , Zhao Qi
Published: September 2013

Finite element (FE) method is used to study the vibration behavior of armchair and zigzag double-walled carbon nanotubes (DWCNTs). In the analysis, nonlinear spring elements and the Lennard-Jones potential function are used to simulate the Van der Waals' force between non-bond atoms of different tube layers. We systematically analyze the effects of aspect ratio, double-atom vacancy defects and Van der Waals' force on the vibration behavior of DWCNTs. The simulation results show that the first order natural frequency decreases with the increase of length-to-diameter ratio (aspect ratio), the existence of Van der Waals' force causes the increase of natural frequency, and double-atom vacancy defects results in the decrease of each order natural frequency.
Use and Maintenance of CNC Machine Tools
Authors: Wang Huan Yun , Su Yi Hua
Published: September 2013

CNC machine tools are advanced, complex and intelligent processing equipment. In order to ensure that the CNC machine tools can operate smoothly and safely, we should pay more attention to the reasonable application and maintenance so as to generate greater efficiency and prolong its service life. In the article the author sorts out some rules and problems in the usage and maintenance of CNC machine tools and provides some reference for the rational use, maintenance of CNC machine tools.
Simulation Study on Biomechanics of Knee Joint in Running
Authors: Yue Hui
Published: September 2013

The study of the forces that act on the body and the body movements during running provide an insight into how certain changes in running technique influence running performance, and how a number of biomechanical parameters can predispose a runner to injury. This paper will describe the biomechanics of running, focusing on the movement of the lower limb segments and the forces encountered during each foot strike with the ground. The effect of running speed and running surface on specific biomechanical parameters and their subsequent influence on running injuries will be reviewed, and the implications of these findings for the design of appropriate footwear disscussed.
Analysing for Flow Field of Water Displacing Oil in Microscopic Pore
Authors: Zhao Li Jun , Li Qing Sheng , Wang Xu Sheng
Published: September 2013

At present, most of the oil fields have already got in high water cut period. For the problem of enhancing oil recovery, the impacts of pressure gradient, the width of the runner, the height of the oil film, the interfacial tension between oil and water, and viscosity on velocity distribution and stress distribution are considered. Using the constitutional equation of generalized Newtonian fluid under the isothermal condition, the flow equation of the water is set up which can describe the flow of the water flowing in the microscopic pores. A numerical simulation for the model is carried out by using Polyflow. The results show that the more pressure gradient, the greater of the oil film height, the smaller interfacial tension between oil and water, there is the better displacement efficiency.
Flow Field Numerical Simulation and Performance Study of Two-Stage Superheated Electrical Steam Trap
Authors: Li Shu Xun , Hou Ying Zhe , Zhang Jian Hua , Li Lian Cui
Published: September 2013

In order to promote the localization of critical valve in ultra-supercritical thermal power generating unit, a two-stage superheated electrical steam trap was designed and developed. Its structure and operation principle was introduced. Three-dimensional numerical simulation of the internal turbulent fluid field was performed by using Fluent of computational fluid dynamics software. The results show that the superposed design of associated reaction with multiaperture equalizer and guide sleeve was adopted in the two-stage superheated steam trap. The internal flow field become more uniform, local maximum velocity reached 37.2m/s. The brush erosion of valve seat is reduced and the service life is increased. Success rate of the first sample's trial-manufacture is greatly improved by using CFD simulation experiment in the process of design. Development cycle is shortened and the cost is reduced, which can provide a reference for two-stage superheated steam trap design.
Non-Steady State Moisture Diffusion Flow in Homogenous Pineapple Leaves Particleboard
Authors: Jamaludin Mohd Ariff , Taib Mohamad Nurul Azman Mohammad , Zakaria Mohd Nazarudin , Kassim Masitah Abu , Zainuddin Nurul Syazana
Published: September 2013

Non steady state diffusion flow is unstable movement of moisture in a material which changes with respect to time. Diffusion coefficient describes the rate at which water moves from the interior to the surface of the materials. Absorption and desorption are the variables that are used to determine the diffusion coefficient. Understanding of the water absorption and desorption is important since it affects the mechanical properties of materials such as strength and durability properties. Water absorption and desorption of the materials or products intended for drying are important for the design and operation of dryers such as kiln drying and other processing system. Nowadays, the processing of solid wood into finish product is decreasing due to increase in the cost of solid wood and insufficient supply of quality logs. Agricultural waste such as pineapple leaves is one of the potential raw materials that can be used in particleboards manufacturing. Pineapple leaves particleboards were produced and the diffusion of coefficient of water absorption, percentage thickness swelling and percentage thickness shrinking were determined. Diffusion coefficient was determined based on the absorption and desorption rate. The particleboards manufacturing followed BS EN 326 and testing of samples was in accordance with BS EN 317. The difference in thickness of particleboard has great influence on physical properties. In this study the particleboard made of 1 cm has the lowest water absorption compared with 2 cm particle board and has highest thickness shrinking.
Mathematic Model of Displacement Control Unit for Screw Distributor of Asphalt Paver
Authors: Mi Zhi Nan , Chen Long An , Tang Jia Tao
Published: September 2013

Displacement control unit is an important part of hydraulic system for screw distributor. By adjusting the angle of swashplate, it can change the flow rate of pump and rotating speed of screw distributor. The rotating speed of screw distributor has influence on quality of road. The mathematical model of displacement control unit is presented. Its dynamical characteristics are analyzed. The mathematical model includes a reset spring gradient. The reset spring gradient is much smaller than the hydraulic spring rate, the effect of the reset spring gradient can be neglected. So an inertial element can be substituted by an integration element.
Topology Optimization of Passive Constrained Layer Damping on Plates with Respect to Noise Control
Authors: Lei Ying Feng , Zheng Wei Guang , Huang Qi Bai , Li Chuan Bing
Published: September 2013

The square of normal surface velocity of a thin plate with a harmonic excitation is minimized by optimizing the topologies of attached passive constrained layer damping (PCLD) treatments. An extended solid isotropic material with penalization model for topology optimization is introduced based on a simple interface finite element modeling for viscoelastic layer of PCLD patch. For the purpose of illustrating the proposed method, a clamped square plate is used in the numerical study. Significant reductions of the objective functions are achieved by the optimal distributions.
Study on Electromagnetic Vibration Pump
Authors: Lu Zhan Xiong
Published: September 2013

Electromagnetic vibration pump is one type of first proposed new household positive displacement pump.It is mainly used to transport water and other low viscosity liquid. It has many advantages including small flow, high head, simple structure,good self-priming performance. Electromagnetic driving method was combined with displacement pump in vibration pump for the first time. Its specific speed can reach below 10,and this is a breakthrough in super-low specific speed pump design.
The working principle of electromagnetic vibration pump and its performance were studied in the paper. each of these problems is further discussed and explained in order to point out the research field for the development of electromagnetic vibration pump later.
Application of Bernoulli Equation in Fluid Mechanics
Authors: Zhang Li , Li Lin
Published: September 2013

Through toppling Bernoulli equation, gain the application of Bernoulli equation in fluid mechanics. Pay close attention to solve the problem concerning how to use it to calculate the engineering data,and how to explain some common phenomenon in our daily life .
Effects of Liquid Properties on Acoustic Gas Bubble Radial Oscillation
Authors: Cai Jun , Chen Xiao Qian , Chen Yong , Huang Yi Yong
Published: September 2013

To analyze the radial oscillation of forced acoustic gas bubble in liquid, a revised model including the effect of compressibility is mathematically formulated. Based on proposed model, the effects of fluid viscosity and temperature are discussed respectively. Numerical study demonstrates that gas bubble oscillation may change from nonlinear chaos into linear one due to the augmentation of fluid viscosity. Meanwhile, the stable oscillation may diverge with a sensible rise in temperature.
Design of Pneumatic Transmission System Base on FSC Car of South China University of Technology
Authors: Li Jie , Li Yong Zhuo , Lu Run Qiang , Yu Shan Hu , Huo Shi Chao , Xia Xin , Zhu Gang
Published: September 2013

The FSC racing pneumatic transmission system of South China University of Technology realize shift semi-automatic, drivers can be more convenient and completed shift operation in a shorter period of time,so as to improve the results of the competition. According to the preset program driving shift cylinderand clutch cylinder ,compressed carbon dioxide under the manipulation of electronic control unit complete whole transmission process. This paper detailed discusses actuator and electronic control unit design process, at the same time on debugging problems arising from the car, put forward the optimization direction of the system.
Prediction of Remaining Useful Life for Used Gas Turbine Blades
Authors: Baheta Aklilu Tesfamichael , Johanis Brilianto Brioann Boni , Jasmani Mohd Shahrizal
Published: September 2013

Used turbine blades are replaced by new once based on manufacturers recommended useful life. However, depending on the turbine operating conditions the blades might have different creep service life. Thus, the aim of this study was to predict the remaining creep life and investigating the microstructure of used gas turbine blades. This was done by using Larson-Miller parameter and Robinson life fraction rules under certain conditions of stress and temperature. The change in microstructure of the materials was analyzed by using the Field Emission Scanning Electron Microscope (FESEM). The result shows that turbine blades suffered from several microstructure changes based on their service life. The method used to predict the remaining useful life of used turbines could be an input to a decision to repair or replace used turbine blades. Keywords: Larson-Miller parameter,life fraction rule, microstructure, creep life, turbine blades.
Flow Behavior of Polymer Viscoelastic Fluid in Complex Channel
Authors: Li Wen Ting
Published: September 2013

A finite volume method for the numerical solution of viscoelastic flows is given. The flow of a differential Phan-Thien-Tanner (PTT) fluid through an abrupt expansion-contraction channel has been chosen as a prototype example. Through the results of numerical simulations, the contours of velocity and stream function are drawn. Numerical results show that the viscoelasticity of polymer solutions is the main factor influencing the sweep efficiency. With increasing elasticity, the flowing area in the channel is enlarged significantly, thus the area with immobile zones becomes smaller, the microcosmic sweep efficiency increases. The visco-elastic nature of the displacing polymer fluids can ingeneral improve the displacement efficiency in pores compared to using Newtonian fluids. This conclusion should be useful in selecting polymer fluids and designing polymer flooding operations.
A Research on Modular Training System of Automobile Engine
Authors: Song Li Min
Published: September 2013

The multifunctional modular training system for electric-controlled engine, which consists of disassembly and assembly module, wiring module of sensor and actuator and controller, detection module of electric controlling system, can achieve the function of machinery system and electric controlling system disassembly and assembly and engine fault diagnosis and analysis. It can meet the need of making real training and improve research capabilities for the teachers and students in related specialty of vocational colleges.
The Research of Damping Adjustable Isolators Control Method
Authors: Jiang Bo
Published: September 2013

The mechanical model of the electro-rheological fluid damping adjustable isolator is established. Then the two degree of freedom vibration adjusting system of engine and car frame is built. The PD fuzzy control method is used to control the damping characteristic of the damping adjustable isolator. Simulation analysis is executed by using Matlab software. The datum of simulation analysis indicates that the isolation capability of the PD fuzzy control electro-rheological fluid damping adjustable isolator is well.
Hardware in the Loop Platform with Brake-by-Wire and Steer-by-Wire System
Authors: Yin Wei Qiao , Li Jing , Li You De , Wei Qing
Published: September 2013

This paper describes an overview of the general structure and working principle of brake-by-wire and steer-by-wire platform at first. We design a real-time hardware and software the system. And we use Matlab/xPC Target real-time platform to build the hardware in-the-loop platform for brake-by-wire and steer-by-wire system, we select typical operating conditions to conduct the hardware-in-the-loop test, the results show that the by-wire system testing capabilities of the platform.
Vehicle Stability Control Based on Generalized Predictive Contol
Authors: Yin Wei Qiao , Li Jing , Li You De , Wei Qing
Published: September 2013

For the uncertain environmental factors existing in the vehicle systems, in this paper we established linear two degree-of-freedom vehicle dynamics state-space model which considering lateral interference, and designed the vehicle chassis coordination controller based on generalized predictive control, utilized combined steering and braking control to strengthen the vehicle yaw and lateral stability. Simulation and Analysis for the controller in MATLAB/Simulink environment were conducted, the results verified the feasibility and effectiveness of the control methods.
Research on Approaches to Aluminum Alloy Automotive Wheels' Lightweight Design
Authors: Yang Baoan , Ye Ya Ping
Published: September 2013

Wheels should meet strength requirements and achieve lightweight design. The analysis of structure characteristics of the aluminum alloy automotive wheels that are widely used was done. Based on the wheel radial fatigue test, the wheel's load was determined. The analysis of the wheel was done applying 3D modeling technology and FEA (finite element analysis) theory, and the results can be used as the theoretical basis of aluminum alloy automotive wheels' lightweight design.
Unloading Behavior Study on FRP-Concrete Interface under an Exponential Softening Law
Authors: Liu San Xing , Yuan Hong , Han Jun
Published: September 2013

Loading behavior studies on FRP-concrete interface are refined enough. Because of the complexity of the problem, there exist relatively few unloading behavior studies. Occurrence mechanism of unloading needs to be clarified. Through a combination of theory and finite element method, this paper studied the unloading behavior involved in interfacial failure process under an exponential softening law, clarified when and where unloading occurred and estimated the effect of unloading.
Studies of Carboxyl-Functionalized Multi-Wall Carbon Nanotubes and Mechanical Properties of its MWCNTs-OPC Cement Composites
Authors: Yang Jing Xin , Xu Yong Zhi
Published: September 2013

This study successfully grafted multiwalled carbon nanotubes (MWCNTs) with carboxyl group (MWCNTs-COOH) via concentrated nitric acid oxidation reaction. The morphologies of MWCNTs oxidized under various conditions and the extent of dispersion of the MWCNTs in the cement matrix were characterized using fourier transform infrared spectroscopy (FTIR). This investigation also optimized the mechanical properties of MWCNTs-OPC cement composites by utilizing pristine MWCNTs (P-MWCNTs) and modified MWCNTs (MWCNTs-COOH) through a combination of dispersion method. Micrographs of MWCNTs incorporated cement samples revealed uniform dispersion of MWCNTs in cement, good interfacial adhesion between MWCNTs and cement, and improved interfacial bonding between MWCNTs-OPC cement at 0.4 wt.% loading. An improved dispersion and hence an improved crosslink interaction between MWCNTs-COOH and cement lead to the stronger shift of the mechanical properties of the cement composites.
The Analysis of Aerodynamic Characteristics of the High-Speed Train in Different Railway Conditions under Crosswinds
Authors: Ye Kun , Li Ren Xian
Published: September 2013

The numerical calculation models of the high-speed train in the straight and different radius curve railway are established. Author calculated transverse forces (moments) acting on the three sections (first train, middle train and rear train). At the same time, under with the shelter wind wall and without the wall, the change trends of side forces coefficients and rolling moments coefficients of trains with the train speed and the transverse wind speed are analyzed. Results show that, in the straight railway and curve railway, transverse loads coefficients increase with the increase of the transverse wind speed and decrease with the increase of the train speed. The transverse forces (moments) of the three sections of the train with the shelter wind wall are opposite to that without the wall. Traffic safety under crosswinds focuses on the rear train with the shelter wind wall and focuses on the first train without the wall. At the same train speed and transverse wind speed, side forces and rolling moments of trains in curve railway is greater than that of trains in straight railway. Absolute values of transverse loads coefficients decreased gradually with the increase of the radius of the curve, and their relationship basically is the linear relation.
Interaction Relationship for High Aspect Ratio Semi-Elliptical Internal Surface Cracks in CO2 Pipelines
Authors: Jin Qiao
Published: September 2013

Surface cracks with aspect ratio can occur in pipelines subjected to corrosion attacks. There are few studies on interaction relationship for double semi-elliptical surface cracks with such high aspect ratio. This paper attempts to develop a finite element method to determine on interaction of two semi-elliptical internal surface cracks with high aspect ratio by analyzing two key fracture mechanics parameters, i.e., the stress intensity factor and the-stress. The numerical results prove that the existing flaw-interaction criteria are too general to lose the worthy of application especially in pipeline engineering.
The Temperature-Dependence of the Saturation Voltage for Molecular Assembly System with the Effect of the Intermolecular Spacing
Authors: Boudjella Aissa
Published: September 2013

Numerical simulations have been performed to investigate the effect of the temperature on the electronic transport through a small group of molecular assembly system (MAS). The model involves two 1,4-dithiolbenzene (DTB) molecular units stacked in one dimension (1D). The currentvoltage (I-V) and the conductance voltage (G-V) analysis are presented under the influence of the temperature associated with the π-orbital coupling interactions controlled by the intermolecular spacingd. TheMASwith reduceddaffects significantly the conductance which results in reducing the conductance gap and the saturation voltageVsat. In addition, the present results show that the temperature rise effect plays an important role in determining the current flow in the saturation region. In this region, it is important to note thatVsatincreases linearly whenTgoes from 50 to 325 K.. To conclude,Vsatcan be controlled either by changing the temperature or modifying its intermolecular spacing conformation.
Characterisation of the Precipitates in Aged Al-4.2Cu-1.5Mg Alloy
Authors: Quan Li Wei , Wang Chuan Cai , Wang Ying Ling
Published: September 2013

In this paper it is investigated the ageing dynamics of Al-4.2Cu-1.5Mg alloy aged at 170°C for different time. Vickers hardness and transmission electron microscopy were employed to test the hardness and microstructures of the aged alloy. It was found that there are two peaks in the curve. The first peak is attributed to the cluster hardening and the second peak is ascribed to the contribution of GPB zones.
Multiple Transfer Used on Repairing Transparent and Electric Film Based on CVD - Grown Graphene
Authors: Zhao Peng Fei , He Da Wei , Wang Yong Sheng , Fu Ming , Wu Hong Peng , Xu Hai Teng , Zhou Pan , Li Shu Lei
Published: September 2013

We optimized the CH4 and H2 gas flow rate of chemical vapor deposition (CVD) graphene growth and obtained larger area, fewer-layered graphene grown on Cu foils. After transfering to SiO2 substrate by PMMA more than 3 times to repair the defect of monolayer graphene film, we synthesized large area, transparent and continuous graphene film. The morphology and structure were characterized by SEM and Raman spectroscopy. Analysis of electrical properties and optical properties show that we obtained low resistance and high transparency of ~90%, which could be used on photoelectric device as solar cell and acceptable for replacing commercial ITO electrodes.
Analysis of the Movement Trajectory of Blasting Flyrock in the Bottom of Open Pits
Authors: Shi Jian Jun , An Hua Ming , Wu Chun Ping
Published: September 2013

The main hazards caused by blasting include vibration, flyrock, air shock wave, noise and dust. And the blasting flyrock is one of the dangerous factors to surrounding environment. Small and medium open pits are usually surrounded with residential districts, so controlling the casting distance of flyrock is very important. It is difficult to predict the casting direction and flying distance of blasting flyrock because of its more influence factors. Based on Sihe stope of Fangmayu Iron Mine, the paper analyses the causes, movement rule and casting direction of the bottom flyrock of open pit caused by bench blasting, calculates the casting distance of bottom flyrock, obtains the actual casting initial velocity and the biggest safe distance of blasting flyrock in Sihe stope. The study results can provide references for reducing the flyrock harzards of open pit caused by bench blasting.
Synthesis of Macroporous FeS2 Nanotubes and their Electrochemical Properties
Authors: Liao Han Tao , Wang You Rong , Wang Jia , Qian Xiao Fang , Cheng Si Qing
Published: September 2013

The particle size and morphology have a strong influence on the electrochemical performance of FeS2electrodes. In this paper, a simple one-pot solvothermal method is reported for the synthesis of macroporous pyrite nanotubes for the first time. The phase composition, morphology and structure of the as-obtained products were studied by the energy dispersive spectroscopy (EDS), scanning electron microscopy, (high-resolution) transmission electron microscopy, X-ray diffraction. The electrochemical properties of the FeS2samples were also investigated. The results demonstrated that the macroporous pyrite nanotubes delivered a higher initial discharge capacity of 925.2 mAh g-1and had good capacity retention.
Fresh-Keeping Effect of Kojic Acid on Rape
Authors: Zhang Xi , Dong Yu Ting , Pei Jiang Sen , Han Tao , Guo Bei
Published: September 2013

Kojic acid is a metabolite from some common microbe, it is a natural preservative. The kojic acid has broad prospects in the storage and preservation of fruits and vegetables. In this study, using different concentrations of kojic acid sprayed the surface of rape and stored at room temperature, observed phenotypic changes. Then the CAT and POD activity, chlorophyll content and weight loss rate were determined in rape treated by kojic acid. From the overall trend, compared with the water, spraying 0.5% and 1% kojic acid to a certain extent reduce chlorophyll loss of rape, water evaporation and dry matter decrease was slowing down, and maintains the appropriate activity of CAT and POD. It means that the kojic acid has obviously effect on rape preservation.
Research on the Corrosion Behavior of TC4 Titanium Alloy by Scanning Kelvin Probe
Authors: Ai Yun Long , Liu Li , He Wen
Published: September 2013

The corrosion behavior and corrosion morphology of two typical TC4 titanium alloy with equiaxed structure and widmanstatten structure in hydrochloric acid solution were studied using scanning Kelvin probe techniques and observed by scanning electron microscope, respectively. The results show that along with the ongoing of corrosion, surface potential of equiaxed structure alloy is moving to positive direction and that of widmanstatten structure alloy is moving to negative direction after positive direction movement. The surface potential of two kinds structure alloy all present cathode and anode region in the corrosion process, which shows the characteristic of selective corrosion. Surface potential difference of widmanstatten structure alloy is greater than that of equiaxed structure alloy and its corrosion resistance is inferior to that of equiaxed structure alloy. Corrosion preferentially occurs in alpha phase of the two kinds structure alloy through corrosion morphology observation analysis.
Structure Simulation Analysis of Piezoelectric Energy Harvesting Device
Authors: Liu Hai Peng , He Yun Li , Gao Shi Qiao , Tan Yang Kang , Jin Lei
Published: September 2013

A low frequency energy harvesting structure was studied, describing the process of its manufacture. The natural frequency was obtained by modal analysis of the structure. It obtained the relationship between the magnitudes of the voltage generated from the piezoelectric energy harvesting device and the size parameters of structure, so that the energy harvesting structure can operate at the resonant frequency in order to obtain the maximum energy.
Numerical Simulation of Binary Alloy Crystal Growth of Multiple Dendrites and Direcitonal Solidification Using Phase-Field Method
Authors: Chen Ming , Jiang Yu , Sun Wen Long , Hu Xiao Dong , Liu Chun Li
Published: September 2013

Phase field method (PFM) offers the prospect of carrying out realistic numerical calculation on dendrite growth in metallic systems. The dendritic growth process of multiple dendrites and direcitonal solidification during isothermal solidifications in a Fe-0.5mole%C binary alloy were simulated using phase field model. Competitive growth of multiple equiaxed dendrites were simulated, and the effect of anisotropy on the solute segregation and microstructural dedritic growth pattern in directional solidification process was studied in the paper. The simulation results showed the impingement of arbitrarily oriented grains, and the grains began to impinge and coalesce the adjacent grains with time going on, which made the dendrite growth inhibited obviously. In the directional solidification, the maximum concentration gradient showed in the dendrite tip, and highest solute concentration existed at the bottom of the dendrites. With the increasing of the anisotropy, dendrite tip radius became smaller, and the crystal structure is more uniform and dense.
Double-Layered Cement Composites with Superior Electromagnetic Wave Absorbing Properties Containing Carbon Black and Expanded Polystyrene
Authors: Zhang Yue Fang , Hao Wan Jun , Li Bao Yi , Duan Yu Ping , Liu Shun Hua
Published: September 2013

This paper reported that, using the method of double layer composite successfully prepared high performance of electromagnetic wave absorption materials. Such a composite is composed of a cement matching layer filled with expanded polystyrene (EPS) beads and an absorbing cement layer made of EPS beads and carbon black. The samples were tested by arching method in the frequency range of 8~18GHz. The reflectivities were revealed to be excellent, the lowest being-17dB. The new material can be used for building indoor electromagnetic radiation protection.
Plasmon-Enhanced Cell Efficiency in Hybrid Solar Cell Based on CdS Nanorod and Poly (3-Hexythiophene)
Authors: Liu Xin Mei , Fu Feng Ming , Guo Wei Min
Published: September 2013

A bulk-heterjunction hybrid solar cell based on CdS nanorods as electron acceptor and conjugated polymers P3HT (Poly (3-Hexylthiophene)) as donor was fabricated through solution processing. Plasmon-active silver nanoparticle layers were introduced in the hybrid solar cell. Silver nanoparticle layers were fabricated using thermal evaporation deposition of 10 nm of silver thin layers on indium tin oxide (ITO) substrate followed by annealing. Under the surface plasmon excitation in Ag nanoparticles deposited on a semiconductor surface, increasing optical electrical field inside the photoactive layer led to an increased short circuit current density (Jsc) and improved fill factor (FF) of the cell. Consequently, under AM1.5G illumination (100 mW.cm-2), the plasmon-decorated cell based on CdS-nanorods/P3HT showed a four-times increase of the power conversion efficiency (PCE) compared with the undecorated one.
An Analysis of Degradation and Stability of Polyaniline Doped with Three Common Industrial Acids
Authors: Fu Ren Chun , Du Jun , Huang Hui , Guo Zhong Cheng
Published: September 2013

The nature of doping acid play important role on the stability of conductive polyaniline (PANI). Many recent investigations have focused on different organic acids. Most organic acids are expensive and difficult to synthesize. According to industrial application, it is important to quantify the stability of conductive polyaniline doped with common acids. Herein, three common industrial acids (hydrochloric acid (HCl), sulfuric acid (SA), methanesulfonic acid (MSA)) doped conductive polyaniline was reported. The degradation performance of polyaniline was investigated by XRD and thermogravimetric analysis (TGA). The mechanism of degradation of PANI was discussed. The result indicated that the stability of PANI-HCl was better than that of other two samples. The optimization processing temperature of PANI-HCl is 100°C~150°C.
Study on Site Measurement of Freezing Soft Aquifer in Cretaceous Strata
Authors: Zheng Tie Qi , Xue Hua Jun , Chen Jun , Ji Ming Nan , Zhen Zeng Lin
Published: September 2013

Artificial ground freezing is a time-varying dynamic and complex process. Traits of the frozen soil wall are influenced by the refrigeration system operating conditions, geological conditions, boundary cooling, construction conditions and many other factors. Nature of the frozen soil and the structural state of the frozen soil wall is a function of temperature, yet the temperature field of the frozen soil wall is changing with time. Further, it has a bad influence on the buildings nearby when Frost-heaving and Thawing-settlement happened during freezing process. it will be necessary to comprehend their real-time settlement and deformation as well as to keep sure the frozen soil wall and the buildings nearby are on regular service. The Lindong mine wellbore is located in the Cretaceous Stratum. A information technology of freezing construction method is used to ensure the safe and efficient construction of the wellbore. It made a great contribution to the lingdong mine yielding and other similar projects.
Impacts of N, N'-diphenyl-1, 4-phenylenediamine (DPPD) Antioxidant Additive in Jatropha Biodiesel Blends to Reduce NOx Emission of a Multi Cylinder Vehicle Type Diesel Engine
Authors: Palash S.M. , Kalam M.A. , Masjuki H.H. , Masum B.M.
Published: September 2013

To meet stringent exhaust emission norms worldwide, various exhaust pre-treatment and post-treatment techniques have been employed in modern engines. Using antioxidant additives in biodiesel fuels is a promising and effective NOx reduction technology. Non-edible jatropha oil based methyl ester was produced and blended with conventional diesel. Five fuel samples (Diesel, JB5, JB5DPPD0.15%, JB15 and JB15DPPD0.15%) were tested for their use as substitute fuel for a radiator-cooled four cylinder diesel engine. Experiment results show that DPPD antioxidant additive could be reduced NOx emission significantly with slight penalty on engine performance as well as CO and HC emission. However, when compared to diesel combustion the emissions of HC and CO were found nearly same or below. By addition of 0.15% (m) DPPD additive in JB5 and JB15 reduction of NOx emission were 12.68% and 13.36 % compared to biodiesel blends without additive at full throttle position. As conclusion, JB5 and JB15 with addition of 0.15% (m) can be used in four cylinder diesel engine to reduce NOx and consequently overcome the barrier to market expansion of biodiesel fuels.