bluuebunny/crossref_metadata_2025 huggingface dataset:
System Design and ICT Adoption in Agricultural Extension Services Delivery in Tanzania
Authors: Sanga Camilius Aloyce , Tumbo Siza D. , Mlozi Malongo R. S.
Published: December 2013

The major purpose of this chapter is to explore the options of Information and Communication Technologies (ICTs) to complement conventional agricultural extension services in Tanzania. Group discussions and meetings were conducted to investigate the role of ICTs in extension services delivery using CATWOE framework of Soft Systems Methodology. The findings of the study reveal that the use of SSM helped the researchers to understand easily the problematic areas of the current situation of agricultural extension services. In addition, it was easy to plan feasible actions to be taken to improve the situation. The framework for the conceptual model towards improving the agricultural extension services in Kilosa District of Tanzania was developed. These results have been used in the development of an ICT-based system (Web- and Mobile-Based Farmers’ Advisory Information Systems) to supplement the conventional agricultural extension system. The roadmap developed as the implementation plan for this research can be used in any e-Government project. The need to improve the way agricultural extension is done in Tanzania through integration of relevant and affordable ICTs is well researched. This book chapter presents how this can be done using SSM approach in an action and participatory research. This is the first presentation of SSM intervention in agricultural informatics in Tanzania. The approach used in this study can be adopted by researchers doing any e-Government research.
E-Procurement System as an E-Government Platform
Authors: Jin Shin Young
Published: December 2013

This chapter introduces and analyzes the best practices and development methods for Information Communication Technologies (ICTs) in South Korea in the realm of e-Government. To the present, national informatization in South Korea has focused on e-Government. This is because e-Government can lead to transformation in national information infrastructure and the public services sector, leading to increased efficiencies. Thus, firstly, this chapter focuses on defining the key concepts of e-Government. Secondly, it analyzes public document systems for the best practices of e-Government in South Korea in the following categories: Government for Citizens (G4C), Government e-Procurement Systems (GePS), the governance system, the On-Nara Business Process System, and the Home Tax Service (HTS). E-Government has reduced the number of documents and therefore reduced costs. In particular, the e-Procurement system has proven effective. This chapter explains the theoretical concepts of e-Government in South Korea via a literature review. Finally, this chapter analyzes instances of success and suggests avenues for future e-Government growth.
Towards a Successful E-Government Implementation
Authors: Sagheb-Tehrani Mehdi
Published: December 2013

There are many different benefits that a government can obtain from encouraging the use of Information and Communication Technologies (ICTs) in its public sector delivery frameworks. Utilization of ICTs as a socio-economic stimulant has long been recognized by governments the world over. Electronic government utilizes ICTs to provide all the access to a wide range of public services. Today, different government departments and/or units at all levels of the governance hierarchy respond to millions of citizen demands electronically. The rising interest of many stakeholders in e-Government calls for a conceptual model that will guide implementation regardless of context. This chapter argues that several key success factors are appropriate and need to be considered for successful e-Government implementation. About one hundred e-Government Websites were examined upon those key success factors. Sixty-one university students took part in this investigation. Using t-test, the chapter investigates the appropriateness of the proposed model.
What is Needed to Advance Transformational E-Government and Why
Authors: Furlong Shauneen
Published: December 2013

Throughout the millennia, project management methodologies were developed, and as projects were completed, both theoreticians and practitioners contributed to the development of project management science and codification. Throughout this time, project management science grappled with the problem of delineating project activities from on-going operational activities. Projects require project management while operations require business process management or operations management (PMI, 2008). In the project methodology world, a project is defined as unique, temporary, a definite start and finish (PMI, 2008). Without this definition, the science of project management cannot be applied. It is this definition that provides the credence for the creation and application of project management processes, tools, and techniques. However, the science of project management exists irrespective of a project. In fact, it is the application of project management to any endeavor that creates a project. Effective project management that will drive the design and implementation of transformational e-Government must be enhanced. This chapter proposes project management enhancements to the design, direction, management, and implementation of e-Government projects that focus on project problems rather than methodological processes. The enhanced project management solution provides the tools and educates the user to take into account the impact of the holistic, synergistic challenges and barriers that surround and influence e-Government projects – heretofore, in an unmanageable way that has inhibited change instead of promoting it. The enhanced project management solution is “exogenous” of the e-Government solution; it is its external driver.
Democratic Deference in a Republican Primary
Authors: Lind Colene J.
Published: December 2013

U.S. political culture holds everyday citizens to be efficacious and sovereign, while elected elites are to be their public servants. Politicians draw on this cultural truth by speaking in a deferential style. This chapter examines the various registers of the language of deference in the 2012 Republican presidential primary and argues that this lexicon produces a tone that rhetorically constructs hierarchical social roles between citizens and leaders. This chapter finds that the candidates were more likely to speak appreciatively when hailing the citizenry but with accommodation and obligation when calling upon political leaders. The chapter concludes by considering how further study of the language of deference could improve leader-citizen relations in the United States.
Intermedia Agenda Setting in Business News Coverage
Authors: Ragas Matthew W.
Published: December 2013

While business news coverage has risen around the world in recent decades, scholarly research into this area has been limited. Scholarship on media coverage of public affairs topics has generally found that coverage patterns converge across news media outlets. This study probes for evidence of intermedia agenda setting among seven elite business news outlets in their coverage of transformational events: corporate proxy contests. The results find that the amount of news stories each outlet devoted to coverage of 25 large proxy contests in the U.S. stock market over a five-year period was highly similar. Intermedia convergence across this news content was also found to a lesser extent regarding issue and stakeholder salience but not, for the most part, with peripheral media favorability. This moderate overall overlap in coverage across media outlets suggests that the notion of a complementary media agenda remains largely intact. The theoretical and practical implications are discussed.
Organizational Identity in Nonprofit Communication about Disability
Authors: Lellis Julie C.
Published: December 2013

This chapter describes the research process used to uncover and describe the organizational identities of ten nonprofit organizations that serve persons with disabilities. Identities were measured by examining the values used in a variety of marketing and public relations materials. This chapter 1) describes how DICTION was selected as a viable option for data analysis, 2) reveals the process of augmenting and building upon a previously tested values instrument with custom dictionaries, and 3) explains how the results were interpreted and used to describe the organizational identities of ten nonprofit organizations. The challenges of data collection and analysis are discussed. Future directions for values-based research are proposed. Discussion relates the results to the challenges inherent in disability-related communication.
DICTION and the Study of American Politics
Authors: Karpowitz Christopher F.
Published: December 2013

A powerful tool for content analysis, DICTION allows scholars to illuminate the ideas, perspectives, and linguistic tendencies of a wide variety of political actors. At its best, a tool like DICTION allows scholars not just to describe the features of political language, but also to analyze the causes and the consequences those features in ways that advance our understanding political communication more broadly. Effective analysis involves helping academic audiences understand what the measures being used mean, how the results relate to broader theoretical constructs, and the extent to which findings reveal something important about the political world. This involves exploring both the causes and the consequences of linguistic choices, including by attending closely to how those texts are received by their intended audiences. In this chapter, the authors review ways in which DICTION has been used and might be used to better understand the role of political leadership, the meaning of democracy, and the effects of political language on the political behavior of ordinary citizens.
DICTION as a Tool for Studying the Mass Media
Authors: Holbert R. Lance
Published: December 2013

This chapter offers a systematic assessment of DICTION’s ability to address a wide range of media content. Each of the media-related works in this volume reflects a unique mix of communication inputs, and DICTION proves itself able to generate valid and reliable insights on a diverse range of material. In addition, the chapter focuses on a series of challenges (e.g., Message Tailoring, Hypertext, Interactivity) and opportunities (e.g., big data) for DICTION in relation to the study of media content. The program and the researchers who utilize it need to continue to evolve with the changing media landscape in order to generate practical knowledge that is relevant to improving communication.
Language Independent Summarization Approaches
Authors: Hmida Firas
Published: December 2013

In this chapter, the authors introduce monolingual and multilingual summarization and present the problem of dependence of language and linguistic knowledge of the process. Then they describe the most influential works and techniques in the field of automatic multilingual and language-independent summarization. This section is presented as a solution to solve the problem already explained. The authors present several language independent approaches and used techniques. In the next section, they study the behavior of these methods by discussing their limitations and perspectives.
Study on Microstructural Evolution of Binary Alloy Crystal Growth in Directional Solidification Process
Authors: Chen Dong Sheng , Chen Ming , Wang Rui Chang
Published: December 2013

PFM (phase field method) was employed to study microstructure evolution, and considering the effect of solute concentration to the undercooling, we developed a phase field model for binary alloy on the basis of pure substance model. In the paper, the temperature field and solute field were coupled together in the phase field model to calculate the crystal growth of magnesium alloy in directional solidification. The simulation results showed a non-planar crystal growth of planar to cellular to columnar dendrite, the comparison of different dendrite patterns were carried out in the numerical simulation, and with the increasing of the anisotropy, the second dendrite arms became more developed.
Nonlinear Static Pushover Analysis for Shear Wall Structures in SAP2000 Program
Authors: Su Zhi Bin , Han Tao , Sun Sheng Nan
Published: December 2013

To study the nonlinear mechanical characteristics of reinforced concrete shear wall structures under rare earthquakes, a single reinforced concrete shear wall model is established in SAP2000 program, which is simulated by nonlinear multi-layer shell element. Nonlinear static pushover analysis of the model is presented by uniform acceleration lateral load pattern and inverted triangle lateral load pattern. The relationship curve between base shear and top displacement of shear wall, and the stress distribution diagrams of the concrete layer and rebar layer are obtained. It may be concluded that, the yielding of rebar layer and the cracking of the concrete layer may be observed by stress distribution diagrams. SAP2000 program is feasible to nonlinear simulation of shear wall structures.
A Study on the Estimation of Economic Loss Costs due to Seismic Damage of Low Rise Steel Structures
Authors: Lee Seung Won , Yang Won Jik , Yi Waon Ho , Kim Hyung Joon
Published: December 2013

Economic losses due to seismic structural damage are growing up due to urbanization, civilization, etc. Recently, quantitative evaluation methods for direct and indirect seismic structural damage have been increasingly studied. A Hazus system developed by the FEMA provides a methodology that can predict direct and indirect economic seismic losses of various building types using probabilistic approaches. Based on the Hazus system, an Earthquake Disaster Response System (EDRS) has been developed in Korea considering the unique characteristics of domestic buildings and seismic environment of Korea Peninsula. This paper presents the methodology that can calculate direct economic losses resulting from structural damage due to earthquakes potentially occurring in Korea Peninsula. This study explains the process computing direct economic losses causing from structural seismic damage and then presents how to obtain data required for the process and how to manage the obtained data. Finally, low-rise steel moment-resisting buildings is selected as an example in order to specifically present a stepwise process for the calculation of direct economic losses due to structural seismic damage.
Advance of Research of Unbonded Flexible Risers
Authors: Zhang Xin Jie , Chang Zong Yu
Published: December 2013

Unbonded flexible risers are widely used in offshore oil and gas production due to excellent mechanical performance, Research achievement and advance in recent ten years are reviewed, the existing problems and trend are proposed.
Nonlinear Response of C/C Composite Laminated Panels with Temperature Gradients under Guassian Pressure Waves
Authors: Sha Yun Dong , Jie Xiao Bo , Zhu Lin
Published: December 2013

Carbon-Carbon composite material is widely used as the thermal protection systems (TPS) of hypersonic vehicles for its special mechanical and heat-proof capabilities. The thin-walled structures with this kind of materials would exhibit large displacement response under high-level acoustic loads. Usually, the external heating is non-uniform. In the paper, a finite element model for analyzing nonlinear random dynamic behaviors of Carbon-Carbon composite panels with temperature gradients under Guassian sound excitation is founded. The total system response is decomposed into the time-independent component and the time-dependent component, using the equivalent linearization technique. Numerical results include root mean square (RMS) values of maximum deflections, time histories and power spectrum densities (PSD) of the deflection response. The results obtained in this paper can contribute to the thorough understanding of thermo-acoustic response of composite thin-walled structures.
Research on Vibration Isolation and Thermal Insulation of the Polystyrene-Filled Sandwich Panel with Cross-Shaped Periodic Ribs
Authors: Shi Gao Shan , Yu Gui Lan
Published: December 2013

This paper is aimed to study the vibration isolation and thermal insulation of the polystyrene-filled sandwich panels with cross-shaped ribs. Based on Blochs theorem, band structure of the sandwich panels can be obtained by Comsol Multiphysics software. According to the Fouriers law and the minimum resistance law, the equivalent thermal resistance can be calculated both numerically and theoretically. The studies show that this periodic sandwich panels exhibit a good performance on vibration isolation and thermal insulation.
Comparative Seismic Risk Analysis of Existing Low-Rise RC Buildings Retrofitted by Metallic Energy Dissipating Devices
Authors: Shin Dong Hyeon , Park Jin Young , Kim Hyung Joon
Published: December 2013

Existing non-seismically detailed low-rise RC buildings have higher seismic risks that are dependent on their seismic capacities and demand of building sites. Seismic risk analysis can be performed considering probabilistic characteristic of the structural damage. Structural damage is more accurately quantified by the damage indices than by a single engineering parameter. This study carries out comparative seismic risk analysis of a prototype building with and without metallic energy dissipating devices. Based on the probability distribution of damage index, it is demonstrated that the application of well-designed MEDDs to low-rise RC building can reduce its potential seismic risk.
Experimental Research on Compression/Compression Fatigue Performance of Impacted Composite Laminates
Authors: Zhang Jian Yu , Li Ming , Hong Hai Ming , Fei Bin Jun
Published: December 2013

Low velocity impact tests were carried out on T300/QY8911 and CCF300/QY8911 composite laminates, which led to similar impacted damage characterized by dent depths on laminates. Compression/compression fatigue strength tests of the impacted laminates were further conducted. The comparison of the compression/compression fatigue performance between the two types of composite laminates with similar impacted damage shows the compression/compression fatigue behaviors of T300/QY8911 and CCF300/QY8911 are similar. It follows that the CCF300/QY8911 is an effectively alternative to the T300/QY8911 in damage tolerance behavior.
Construction of the Macro-Mesoscopic Yield Criterion of Concrete Based on the Technique of Energy Density Supporting Function
Authors: Jiang Qun , Xia Xiao Zhou , Zhang Qing
Published: December 2013

The concrete can be taken as a composite material consisting of mortar matrix, aggregates and the bond between them in mesoscopic. And the shape of aggregate is assumed to be sphere and the mortar matrix is supposed to satisfy the D-P yield criteria. The energy density support function is introduced to reflect the yield surface of mortar matrix. In order to solve the non derivability on the yield boundary, the function approaching series is constructed to substitute for the energy density function. Finally, a macro-mesoscopic yield criterion of concrete material is derived by nonlinear homogenized technique. Through this macro-mesoscopic yield criterion, the influence regularity of the bonding status of interface and the fraction of aggregate on the macro friction coefficient is explored. // <![CDATA[
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Influence of Thermal Effect on Electrochemical Corrosion Behavior of T2 Copper in Simulated Seawater Environment
Authors: Li Ji Nan , Chen Gang , Zhang Peng , Su Qian , Luan Dong , Guo Bin
Published: December 2013

This paper has designed electrochemical corrosion experiment of T2 copper in 3.5% NaCl solution to investigate influence of thermal effect on electrochemical corrosion behavior of copper in simulated seawater. Solution temperature was 20°C, 30°C, 40°C and 50°C. The water quality parameters and polarization curve have been measured and analyzed. Corrosion morphology and composition of corrosion products have been observed and analyzed. Thermal effect would lead to water quality variation which influenced the corrosion behavior of copper samples and corrosion potentials would fluctuate with temperature rising. Sample surface of 30°C was neatly covered with fine, uniform and granular corrosion products. There're Cu2O and CuCl on both samples of 20°Cand 30°Cand trace corrosion product of CuC2O40.5H2O and CuCl2 of only 30°C.
Bright Line Defects of Hot Rolled Plate for 2205 Duplex Stainless Steel
Authors: Zhang Hui , Zhang Yong Jun , Han Jing Tao , Dong Yuan , Hu Jie Ren
Published: December 2013

In hot rolling process of 2205 duplex stainless steel, it was found that bright line defects are mainly located at where is about distance of 200 mm from two sides of hot rolled plate. The forming reason of bright line defects is studied by means of metallographic microscope, scanning electron microscope (SEM) combined with energy dispersive spectrometer (EDS). It is concluded that the formation of bright line defects has associated with sticking and that the temperature reduction on the edge of hot rolling plate causes a high percentage of austenite phase which is network structure. In order to prevent or avoid the happening of the sticking phenomenon, it is necessary to uniformly distribute the oxide on the strip surface by controlled rolling process.
Numerical Solution of Temperature Field for Stress Analysis of Plate Structures
Authors: Čajka Radim
Published: December 2013

In the paper is described the solution of unsteady temperature field of multilayer plane structures. Nonlinear material and thermal properties of each layer for high temperature and fire is used. Defining the boundary conditions and calculation of the temperature at the contact material layers of the conditions of equality thermal flux is performed. The compiled program NONSTAC programmed numerical solution of differential equations modified heat conduction Euler and Runge - Kutta method with a variable integration step length. This computer program solves one dimensional temperature distribution. It is possible to input appropriate thermal characteristics as a function of temperature and to take into account heat of hydration development and variation of environment temperature. Calculated temperatures can be used for stress and strain analysis of shallow foundations with slide joint in footing bottom and fire resistance of plate structures.
Effect of Fiber Surface Modification with Different Functional Groups Silane Agents on Mechanical Properties of Hemps/Polypropylene Composites
Authors: Han Hong Chang , Gong X. Lu
Published: December 2013

In this paper, we firstly treated the hemp fiber with alkali solution, followed by chemical modification with silane agents: 3-(Trimethoxysilyl) propyl methacrylate (MPS), N-[3-(Trimethoxysilyl) propyaniline (PAPS) and (3-Aminopropyl) triethoxysilane (APS), respectively. These treated fibers were then blended with polypropylene (PP). SEM morphology and FT-IR spectra confirmed the successful modifications of MPS, PAPS and APS with hemp fiber. The tensile tests results showed that APS improved the mechanical properties of composite, due to the amino of APS could react with maleic anhydride forming amide covalent bond which is benefit in the stress transferring from PP matrix to fiber. In contrast, since the incompatibility of aniline with propylene, PAPS modification decreased the fracture stress composites. The existences of ester and vinyl groups in MPS contributed to the increase of composite fracture strain caused by chain slips.
Time Series Modeling of Earthquake Ground Motions Using ARMA-GARCH Models
Authors: Lin Jeng Hsiang
Published: December 2013

Engineers are well aware that, due to the stochastic nature of earthquake ground motion, the information obtained from structural response analysis using scant records is quite unreliable. Thus, providing earthquake models for specific sites or areas of research and practical implementation is essential. This paper presents a procedure for the modeling strong earthquake ground motion based on autoregressive moving average (ARMA) models. The Generalized autoregressive conditional heteroskedasticity (GARCH) model is used to simulate the time-varying characteristics of earthquakes.
The Numerical Simulation of Blasting Demolition on the Solid Pier
Authors: Feng Jian Ping , Huang Ping Ming , Zhu Zheng , Wang Di , Sun Wei Gang
Published: December 2013

Reinforced concrete is the main material of the bridge structure, a lot of reinforced concrete bridges in service are needed to be demolished. Firstly, the numerical simulation of blasting demolition of reinforced concrete was introduced; secondly, the separate model of common nodes of the reinforced concrete solid pier was built by using the software ANSYS/LS-DYAN; lastly, the effect of numerical simulation of blasting demolition on the solid pier was analyzed.
Effects of the Mould Temperature on the Properties of Graphite/Carbon Fiber/Copper/Phenolic Resin Composites
Authors: Li Mi Dan , Lu Yao , Guo Xin
Published: December 2013

Natural graphite, carbon fiber and copper powder as fillers are incorporated into phenolic resin to fabricate conductive polymer composites by hot compression moulding. The effects of the preparing method and mould temperature on the density, electrical conductivity and hardness of composites are investigated. It is found that the density, electrical conductivity and hardness of composites increase as mould temperature increase from 150 °C to 180 °C. Up to 200 °C, the hardness of composite shows a large decrease. At 170 °C, the density, electrical conductivity and hardness of composites are 1.904 g/cm3, 3.43 × 103 S/m and 54 HS, respectively. Oxidation action occurring in the phenolic resin could be the main reason for the large decrease of hardness as temperature increases up to 200 °C.
First-Principles and Experimental Study on Cu Doped SnO2 Structure
Authors: Shan Lin Ting , Ba De Chun , Han Xiao Bo
Published: December 2013

SnO2 and Cu-SnO2 thin films were fabricated by the sol-gel method. The influence of annealing temperature and copper addition on the morphology and microstructure of the films was studied using X-ray diffraction (XRD) and UV-Visible, respectively. The results show that the tetragonal rutile phase is evidenced by XRD with no other phases observed. The crystallinity of SnO2 and Cu-SnO2 thin films had been improved with the increasing annealing temperature. The grain size decreased after Cu doping. On theoretical, Pure and Cu-SnO2 were calculated by first-principles full potential linearized augmented plane wave ultra-soft pseudo-potential method to investigate band structure.
Thermal Analysis of Lithium Ion Batteries Using in HEV
Authors: Fofana Gaoussou Hadia , Zhang You Tong
Published: December 2013

The lithium ion battery, thanks to their high density and high power, became promotes element for hybrid and EV vehicles. After several recent researches, it has been proved that lithium ion batteries are currently confronts a problem of temperature rise during their operation discharge, which affects the batteries performance, efficiency and reduces the life of lithium ion battery. However, this work is set to access the three dimensional analytical modeling based on Greens Function technique to study the thermal behavior of lithium-ion battery during discharge with different discharge rates (0.3C, C/2,1C, 2C,) and strategies natural convection cooling on the surface of the battery is performed.
Nonlinear Analysis of Rotary Sealing Performance of Rubber O-Ring
Authors: Chen Shao Hua , Jiang Guo Zhang , Li Gong Fa , Xie Liang Xi , Qian Wen Qiang
Published: December 2013

The two-dimensional O-ring seal nonlinear axisymmetric finite element model are established which is used for swinging hydraulic cylinder. Some factors influencing rubber O-ring sealing performance were taken into account, such as rotating shaft diameter, O-ring seal section diameter. The results indicate that when medium pressure is zero, the two factors influence Von Mises and maximum contact stress of sealing face greatly. Under medium pressure (P=10Mpa), the two factors have a little influence to Von Mises and maximum contact stress.
Static Bending Strength Analysis of the New Self-Healing Composite Gear Based on ANSYS
Authors: Zhang Li , Ma Yan Miao , Nie Guang Yuan
Published: December 2013

A new kind of self-healing composite gear, namely the short glass fiber reinforced nylon 6 composite gear with 3.5wt% microcapsules, is studied in this paper. Its 3D model is built through the parameterized modeling function of Pro/E software, and then its stress distribution under a certain load is analyzed based on ANSYS, through which the maximum bending stress of the self-healing composite gears is obtained and the dangerous position is located. At the same time the same analysis is conducted on the composite material with no microcapsules. By comparing the analysis results of these two kinds of composite gears it shows that after adding 3.5wt% microcapsules the maximum bending stress of the composite gears decreased by 0.72% which can be seen basically unchanged, and their stress is almost in the same distribution with invariant dangerous position. The above result shows that the self-healing microcapsules have little influence on the static bending strength of composite gears.
Design Research of Steel Pipe Combination of Angle Steel Tower of XiYue 220kV Cross Section
Authors: Ju Yan Zhong , Fu Xiao Xu , Zeng Neng Xian
Published: December 2013

Given the path situation of Xiyue substation 220kV four outlets project crossing Shunde waterway section,this article applies of Dao Heng tower full stress analysis software and the finite element analysis software ANSYS to two steel pipe combination of angle steel towers to carry on design research,contrast axial stress of two kinds of software,analyse the reasons of axial stress difference.
Shield Lining Segments Design Research Based on Characteristic Parameters
Authors: Li Li Xin , Zhang Shuang , Zou Qi Yun , Shi Qing Xue
Published: December 2013

As we all know, the thickness of the shield lining segments, reinforcement ratio and other parameters of the design have a direct impact on the economics of the project. We have taken a model of parametric analysis simulation and by the way of changing the parameter of lining segments to research their deformation and stress. Finally, we get the relationship between the characteristic parameters and the deformation and stress of the lining segments, and summed up the characteristic parameters which are more influential.
Study on Dedicated Test Bed for the Sealing Performance of Metal Rubber Seal
Authors: Yan Hui , Zhang Wen Jing , Jiang Hong Yuan , Li Yuan Chao
Published: December 2013

Dedicated TestBed (DTB) for detecting the sealing performance of Metal Rubber (MR) was designed and manufactured based on Siemens S7-200 PLC. The experiments, such as high temperature and large temperature difference experiment, could be conducted with real-time monitoring by DTB. The general design including mechanical and control part of DTB is introduced in detail.
Study on the Influences of Datum Precedence on Functional Tolerance Analysis
Authors: Li Chun Li , Yang Jian Xin , Sun Jian Wei
Published: December 2013

Tolerance analysis plays an important role at the stage of product design and has great influences on the assembly quality and manufacturing costs. A positioning mechanism composed of two parts with cylindrical and planar junction is chosen for studying the influences of datum precedence on functional tolerance analysis. For different cases, the tolerance specification is specified with ISO tolerance language and the analysis line method is applied to obtain the analytical expression between the possible displacement on functional feature and geometric deviation on each part. The results for different datum precedence are summarized in this paper.
An Approach to Investigate Dynamic Parameters of Bearings Joint Surfaces Based on the SDOF System
Authors: Wang Lian Bao , Hu Xiao Qiu , Dong Xiang Long
Published: December 2013

As commonly supporting parts of the spindle and the feed systems on the high-end grade CNC machine tool, the dynamic characteristics of angular contact ball bearings had been a research hot spot in the current. Aiming at solving the problem that obtained dynamic stiffness and damping of angular contact ball bearings, an approach to investigate dynamic parameters of bearings joint surfaces was proposed based on the single degree of freedom (SDOF) system, and several groups of modal testing were carried out. The dynamic characteristics of bearings joint surfaces were viewed as several viscoelastic units of spring and damper. Then, models of bearings dynamic parameters in the axial and radial directions were established, and several groups of modal simulation were carried out. The comparison of experiment and simulation results showed that the proposed approach could accurately identify dynamic stiffness and damping of bearings under different load conditions, and the errors were controlled within 7.6%.
The Impact Analysis of Tire Parameter for Tire Wear When Monorail Vehicle Curve Driving
Authors: Du Zi Xue , Wen Xiao Xia , Shen Zheng
Published: December 2013

monorail spatially coupled dynamic modeling which has three directions attached contacts wheel have been established. According to the simulation and experimental results, dynamic model was validated. based on the dynamic coupling modeling , the tire parameter influence trends for the tire wear of walking wheel’s tires were analyzed when monorail vehicle curve driving. The analysis result revealed that because the contact of straddle-beam monorail is special, with the cornering stiffness increases of walking wheel tire, by the impact of the contact radial force from guide wheels and stabilizing wheels, the lateral forces of walking wheel is gradually increasing. tire wear speed increases at a constant when monorail vehicle curve driving.
Preparation and Characterization of Aqueous Polyurethane Polyol Used in Waterbore Two-Component Polyurethane Coating
Authors: Geng Xiao Yi , Hu Zhi You , Yang Fei , Zhang Li Juan , Li Meng Qian , Geng Yao Zong , Xiao Ji Jun
Published: December 2013

Aqueous polyurethane(PU) polyols were synthesized from polyester polyol, toluene diisocyanate(TDI), dimethylolbutyric acid (DMBA) and diethanolamine(DEA). The structure of PU polyol and resulting polyurethane film were confirmed by the Fourier Transform Infrared Spectroscopy (FT-IR). The effects of NCO/OH and DMBA content on the particle size of PU polyol and resulting polyurethane films, which formed by the mixture of PU polyol and water-dispersible polyisocyanate, was investigated by dynamic light scattering analysis, dynamic mechanical analysis and measurement of the mechanical properties.The results show the increase in DMBA content or NCO:OH ratio may be used to decrease the particle size of aqueous polyurethane polyol, increase the Tg for two-component aqueous PU film and maybe adjust the mechanical properties of resulting film.
Kinematics and Dynamics Analysis of Piston-Connecting Rod Mechanism of Internal Combustion Engine
Authors: Jia Zhi Ning , Hao Cai Zhe , Sun Jian Bo , Liu Xiang Yu
Published: December 2013

The kinematic and dynamic performances of piston-connecting rod mechanism of internal combustion engine (ICE) were analyzed in detail. Taking standard slider-crank mechanism as study object, the kinematic and dynamic parameters (velocity, acceleration, angular acceleration etc.) of linkage were derived. Under no any simplification, the calculating method of each physical parameter was provided. Meanwhile, taking the factual force applied to connecting rod into account, the graphical method of vector equation was used to solve each load imposed on connecting rod. The research works were believed to be beneficial to subsequent finite element analysis (stress and train fields, fatigue of connecting rod) and size optimization design of connecting rod.
Research on the Dynamic Parameters Equivalent Model of Angular Contact Ball Bearings
Authors: Wang Lian Bao , Hu Xiao Qiu , Niu Wei Peng
Published: December 2013

Aiming at the key problem in determining the modal parameters of bearings finite element model (FEM), an equivalent model to investigate the bearings dynamic parameters was proposed based on the Sjoväs load integral formulae, and several unequal units of spring and damper were applied; an experimental device for testing the bearings dynamic parameters was developed. The comparison of experimental results and simulation results showed that the proposed modeling approach could accurately analyze the modal parameters of bearings, and the relative errors of corresponding vibration frequencies in the radial and the axial directions could be controlled within 3%.
Study on Engine Idling Torque and Speed Ripple Cancellation of HEV
Authors: Liu Xiao Hong , Zhang You Tong
Published: December 2013

According to the character of the torque and speed ripple of the engine idling analysed from its Fourier transformed, use motor torque to compensates the primary and second harmonics of Fourier transform of the output net torque during engine idle in HEV. The simulation results show that the engine torque ripple and speed ripple decrease greatly, so the system smoothness and economic efficiency were achieved.
Life Prediction of Two Rotor Steels under Creep-Fatigue Interaction at Elevated Temperature
Authors: Xu Hong , Zhang Wei Wei , Maile Karl
Published: December 2013

The fatigue tests with 16 hours hold time have been conducted for two rotor steels, 1CrMoV and 2CrMoNiVW at 550°C to investigate their creep-fatigue interaction behaviors, as well as those without hold time for contrast. And two life prediction methods are used to correlate the present creep-fatigue life data. It is shown that a significant reduction in fatigue life is observed with hold time in tension, and it is also observed that 1CrMoV steel exhibits a higher creep-fatigue life than 2CrMoNiVW when strain hold time is 16 hours, and 2CrMoNiVW seems to be more sensitive to hold time influence. In addition, both methods could give satisfactory creep-fatigue life predictions, but with their own limitations.
Analysis of Dynamic Characteristics of the Dual Ball Screw-Driven Linear Feed System in Z Direction
Authors: Huang Jun , Wang Zhen Hua , Yuan Jun Tang
Published: December 2013

The vibration modals and harmonic responses of the dual ball screw-driven feed system in Z direction are analyzed by the software ANSYS. In this paper, the equivalence of characteristics of fixed and rolling joints is emphasized, while the influence of joint faces on the dual ball screw-driven feed system is analyzed. In addition, the FEM results of spindle and spindle box connecting the feed system are compared with the modal testing value. The results show that the relative errors between corresponding order natural frequency and the test results are within 10%, which verified the accuracy of the modeling method, and the influence of combination on the analysis of the ball screw feed system can't be ignored. Depending on the above, weaknesses of dual ball screw-driven feed structure is found out, which provides the basis for structural optimization.
A Study on the Effect of Driver Model Parameters on the Performance of Driver-Vehicle-Road Closed-Loop System
Authors: Zhang Li Zeng , Guan Hsin , Jia Xin , Lu Ping Ping , Chen Yong Shang
Published: December 2013

The concept of DODF and other two evaluation indices based on DODF were proposed. Based on the optimal preview acceleration driver model, the effect of driver model parameters on the performance of driver-vehicle-road closed-loop system was studied by the closed-loop system simulation. The results show that the preview time of a driver who has good driving habits should be always larger than a certain value TP0, the increase of both nerve delay time td and muscle lag time Th lead to the increase of TP0, and td has more effect on TP0 than Th does. The increase of both td and Th lead to the decrease of DODF, and td has more effect on DODF than Th does. Furthermore, the increase of both td and Th also lead to the increase of both tracking index JEM and driving load index TCM, td has more effect on JEM than Th does, and Th has more effect on TCM than td does.
New Structural Design of Coal Mine Rescue Robot
Authors: Niu Shu Guang , Wang Xiao Lei , Jiang Xiao Mei , Hou Zhi Ya
Published: December 2013

Abstract: Based on the particularity analysis of coal mine accidents and fire occurred, a rescue robot is designed for coal mine and fire rescue. This robot adopts four tracks composite drive mechanism with front and rear machine hinged, and has good climbing, obstacle capability, the ground adaptability, mechanical properties, waterproof, fireproof, explosion-proof and other functions. It carries oxygen, food, lighting, water, self-help equipment and first-aid medicines to achieve effective relief.
The Research of the Monitoring and Control Device for Pneumatic Rock Drilling Machine Based on Configuration Software
Authors: Gong Bin
Published: December 2013

This paper presents the construction scheme of the monitoring and control device for pneumatic rock drilling machine. The system composition，design and functions of the device are described. The gas pressure control, data acquisition, data analysis and storage automation have been achieved though the electric proportional technology, PLC technology and Forcecontrol 7.0 configuration software. The device is characterized by remote monitoring and control functions, possesses a favorable man-machine interface system.
Nonlinear Model-Based Control for Vacuum Altitude Simulator
Authors: Li Gang , Li Bao Ren , Du Jing Min
Published: December 2013

Vacuum altitude simulator (VAS) is the key component of the hardware in the loop simulation (HILS) of the aircraft control system. Due to the compressibility of the air and the nonlinearity of the exhaust capacity of the vacuum pump, it is difficult to get a good performance with normal linear controller. In this paper, the nonlinear mathematical model of the system is established. A feedback linearization controller is developed based on the model. To handle the uncertain nonlinear dynamics, the integral control is introduced. Experiments indicate that the proposed controller can effectively improve the stability and the dynamic response of the system.
The Monitoring System on Energy Consumption of Device Based on Wireless Network
Authors: Fang Jin Xiang , Zhang Jing
Published: December 2013

In this paper, a monitoring system on industrial energy consumption is proposed. The system is composed of monitoring host, coordinator, data collection terminals which is connected to energy measuring instruments (such as electricity meters, water meters, heat meters, etc.) and yield counting sensors. Based on ZigBee protocol, a low-power wireless monitoring system is made of data collection terminals and coordinator. By accurately monitoring the production process, energy consumption can be saved and production efficiency can be promoted effectively.
Leakage Detection Method for Piping Network Based on BP Neural Network
Authors: Jin Tao , Zhou Ze Yuan
Published: December 2013

To solve the problems that the detection and location of the leak in water distribution network, the relationship between nodes is discussed, then the method according to the unsatisfied node to locate the leakage point. Based on the results, BP neural network is used to reflect the relationship between node systems pressure to decrease computation volume, it not only avoid unnecessary computation but also make the result more reliable according to real-time update of neural network. Simulation results show the effectiveness of the method, high coupling of the node system can be used in leakage location of the water distribution system.
Research on Customized Indoor Route Recommendation
Authors: Jia Hong Wei , Zhao Fang
Published: December 2013

Research in this paper focuses on route recommendation for customers in shopping malls for a LBS(Location-based service ) system. Besides the shopping places selected by a customer, this system can recommend shopping places according to customers history record and similar customers history record analysis. In addition, the length of all routes between two walking destinations, and the traffic density on the routes are two primary factors when route optimization is done in the system. The algorithm referred above have been implemented. A large number of testing showed that the algorithm was efficient to meet the actual need.
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Separation Test of Ilmenite in Guizhou
Authors: Ran Jin Cheng , Liu Quan Jun , Zhang Zhi Guo
Published: December 2013

The grade of the TiO2 in the crude ore is 5.84%, the grade of the iron is 28.38%, and the form of the TiO2 mainly is ilmenite. Because of the TiO2 dense symbiosis with the iron, so the difficulty of the study is the effective separation of TiO2 and iron. After testing we decided take the process of grinding the crude ore, then get the iron concentrate through the high gradient magnetic separation. After tailing by the spiral chute, the concentrate through the shaker for the final selection of titanium concentrates. As a result, we attained satisfying selecting targets through closed-circuit test: The grade of TiO2 is 45.38% and the recovery is 70.64% in the TiO2 concentrate. The grade of iron is 57.42% and recovery is 63.80% in iron concentrate.