bluuebunny/crossref_metadata_2025 huggingface dataset:
Post Occupancy Evaluation with Green Facades of Elementary and Junior High Schools in the Yilan Area
Authors: Hsieh Hung Ren , Yeh Fang Jyun
Published: February 2012

This study has focused on post occupancy evaluation of green facade for elementary school classroom in Taiwan to appreciate the actual situations and usage problems for green facades. This study has chosen three schools for case study. Based on field measurement, and user interview and user questionnaire, they are being used to clarify the environment improvement contributed by green facade establishment and its effectiveness of environment education of each case. This study also found usage and maintenance and management problems derived from green facade installed. Results show that the effectiveness of green facades on the classroom indoor environment improvement is partial significant, on the environment education is not as good as anticipated and on the maintenance and management have many problems and some unexpected negative effects. According to the above results, this study proposes relative planning and designing suggestions as a reference for schools that are willing to have green facades establishment in the future.
The Usage of Appropriate Technology in Green Architecture -Take Village Homes Green Community for Example
Authors: Qiao Feng
Published: February 2012

Combined with the modern appropriate technology to fix the architectural destruction brought with the earth environment is one of the development directions of green architecture. According to the technological and social research achievements and the relational proposal of technology, nature and society, the research not only put forward suggestions on theory and practice of green architecture and technology, but also rethink the applicability of current technological and social concept by the case of American Village homes green community, in order to open up the communication cooperation space and explore the feasibility for remolding the modern society.
Influence of Concrete Strength Grade and Age on Three Tensile Strengths
Authors: He Xi Xi , Fang Ping
Published: February 2012

Uniaxial tensile strength is one of the important strength parameters of concrete. In this study, two test methods were applied to determine direct tensile strength, splitting tensile strength and flexural strength of fly ash concrete specimens with the same cross section and different strength grades. Relationship among the uniaxial tensile, splitting tensile and flexural strength of concrete were researched. Furthermore, the influence of concrete strength and age to the three tensile strengths were specifically analyzed in the paper.
Theoretical Analysis of Chloride Ion Migration Tests in Cementitious Material Research
Authors: Yang Jin Bo , Liu Reng Guang
Published: February 2012

Chloride ion migration tests, or so called electrical accelerated tests, for testing chloride diffusion coefficient of cementitious materials are reviewed. The ion migration theory of electrical accelerated tests is presented. Four main representative measures, chloride penetration test, steady state migration test, unsteady state migration test and salt saturated conductivity test, are introduced and their theoretical calculations of chloride diffusion coefficient are described. Through analysis of the theoretical calculations, it could be found that all electrical accelerated tests are based on ion migration theory although different suppositions are adopted. Steady state migration test is the most suitable measure to determine chloride diffusion coefficient among the migration tests. DCIPT, DRCM and DSSCT calculated by chloride penetration test, unsteady state migration test and salt saturated conductivity test could be used to identify the resistance to chloride ion penetration of cementitious materials but are not the real diffusion coefficient.
Process Research of 1-(3,4-Dichloropheny)-3-Methyl-Pyrazolone-5-one Synthesis
Authors: Yu Hui Qun , Mo You Bin , Liao Yan Fang , Zhou Hai , He Zhi Peng
Published: February 2012

The new process of 1-(3,4-dichloropheny)-3-methyl-pyrazolone-5-one (34DCPMP) synthesis had been discovered, which using 3,4-dichloro phenylhydrazine hydrochloride(DCPH) and ethyl acetoacetate as the raw material , The product was obtained by the route during cyclization in aqueous medium. The structure of products was confirmed by 1HNMR, 13CNMR and IR. The effects of factors on the yield of products were investigated. It was found that the yield of 34DCPMP can reach 98.7% under the optimal reaction condition of n(34DCPH):n(ethyl acetoacetate) with 1:1.1, n(34DCPH):n(Na2SO3) with 1.3:1 at 80°C, and pH 7.5 for 3h. The chromatographic purity can be higher than 98.2%.
Effect of Strain Rate on the Compressive Mechanical Properties of Concrete
Authors: Sun Ji Shu , Ma Li Jie , Dou Yuan Ming , Zhou Ji
Published: February 2012

Concrete is one of the most widely used construction material throughout the world. But the properties of concrete under different strain rates differ from each other greatly. In order to investigate the effect of strain rate on concrete compressive mechanical properties, compressive experiments of concrete specimens (C35) are carried out on MTS, with the uniaxial strain rates ranging from 10-5/s to 10-2/s. The compressive mechanical properties of concrete under different stain rates, which include compressive strength, elastic modulus, peak strain and Poisson's ratio are studied systematically. The formulas which can describe the change laws of the compressive properties of concrete under different the strain rates are proposed. The test results show that the compresseive strength and elastic modulus of concrete would increase with the strain rate increasing. The effect of strain rate on peak strain and and Poisson's ratio is not significant. These research achievements can contribute to grasp the dynamic properties and build the dynamic constitutive models of concrete.
Effect of Polymer to early Mechanical Property of the Fly Ash Slurry
Authors: Lin Yue Zhong
Published: February 2012

In this paper, different polymer dosage in case of early mechanical properties of fly ash slurry, through testing studies have shown that it can increase 7d flexural strength of fly ash slurry in low dosage, result in lower intensity in high dosage. But overall, the compressive –breaking ratio is reduction, polymer can improve flexibility of fly ash cement, it has a certain elasticity and resistance to deformation, in particular, can be used to prevent wind and fire damage for coal road .
Experimental Research on the Separation and Recycle of Waste Concrete
Authors: Zhang Ri Hua
Published: February 2012

Concrete is the largest amount of artificial building materials in the world today. According to incomplete statistics, the construction waste produced in china each year can reach about one hundred million tons, and it can reach hundreds of millions of tons due to the long accumulation, which has become a serious social and environmental issues. In this paper, the technology of separation and recycle of waste concrete is studied, and the components of waste concrete are separated effectively, which provides a technical guarantee for the recycling of waste concrete. The waste concrete is disposed through the process of crushing, shelling and sieving and so on, the coarse aggregate and fine aggregate are separated effectively, the properties of coarse aggregate are nearly the same as natural aggregate. When the shelled fines is milled into ultrafine powder and used as concrete admixture, the performance of concrete can be improved. These all provide a new effective way for the recycling of waste concrete.
Research on Life Cycle Cost Model of Drainpipe Network
Authors: Hao Gui Zhen , Wang Li Min , Wang Shu Na
Published: February 2012

The cost model for optimal design of drainpipe network was formed, according to the conception of total life cycle management,and the functional relation of drainpipe construction cost and tube diameter and burial depth was fitted, according to the quota of index of estimate,this made that it is possible to estimate total life cycle cost of drainpipe network accurately.
Effect of Superplasticizer Type and Dosage on early-Age Shrinkage of Portland Cement and Rice Husk Ash Pastes
Authors: Sua-Iam Gritsada , Makul Natt
Published: February 2012

In this work, the effect of superplasticizer type and dosage on early-age shrinkage of ordinary Portland cement (OPC) and rice husk ash paste (RHA) was investigated. The OPC and RHA pastes with a water/binder materials ratio (W/B) by weight of 0.22 and various dosages of polycarboxylate ether-based superplasticizers (PCE) and sulphonated naphthalene formaldehyde condensates (SNF) were investigated. RHA was partially substituted of 0%, 10% and 20 % by weight of OPC. Volumetric shrinkages of the pastes at the first 72 hours of hydration have been found to range from 0.28 to 12.26 mm3/g and from 0.20 to 9.04 mm3/g of binder materials for SNF-based and PCE-based superplasticizers, respectively. The PCE-based superplasticizer can decrease an increase in shrinkage of the OPC and RHA pastes higher than those of containing the SNF-based superplasticizer.
Study of Pervious Concrete in Aggregate Gradation Structure
Authors: Zhao Fang Ran , Ding Zhao Lu
Published: February 2012

The influence of the accumulated structure formed by the aggregate particles on permeability and strength of permeable concrete was investigated by three-dimensional geometry method, which was proved by theoretical analysis and experimental study. In theoretical analysis, the accumulation structure of the aggregate was in a steady or quasi-steady state, particle size distribution was optimized to obtain the desired permeability coefficient and sufficient strength. The results showed that it is more appropriate that the ratio of the secondary particle size is 0.2d - 0.4d when the large particle size is d. To obtain good permeability in experimental study, the large voids have a large proportion in all kinds of voids statistics distribution of aggregate accumulation of structure in pervious concrete. The percentage of fine particles needs to be controlled to achieve the desired permeability and concrete strength.
A Class of Stochastic Control Problem Governed by a Poisson Process
Authors: Tian Shao Lin , Li Ji Chun , Liu Kun Hui
Published: February 2012

In this paper, we examine an optimal impulse control problem of stochastic system, whose state follows a Brownian motion. Here we want to maximum the objective function. The main feature of our model is that the controlled state process includes an impulse control governed by a Poisson process. In other words, the set of possible intervention times are discrete, random and determined by the signal process. Here we not only present a theorem giving a sufficient condition on the existence of an optimal control and its corresponding objective function, but also provide an explicit solution obtained under some simplified conditions.
Numerical Simulation for Karst Water Drainage of an Iron Mine
Authors: Wang Yu Shan , Chen Zhi Hua , Zhang Fu Cun
Published: February 2012

An iron mine in Fujian that is mining a hydrologically complicated deposit with karst water, faces the problems of high water pressure and unclear inflow. Therefore, it’s imperative to predict mine discharge exactly. The 3D finite element simulation model is established basing exploration data and theoretical analysis results, which gives exact generalization of special hydrogeology elements such as fault zone, karst springs, surface water leakage and chamber for dewatering. At last, the effect of dewatering scheme are evaluated for +300m.
Poly Silk Peptide Film PH Sensor Based on Zero Current Potentiometry
Authors: Ma Ming Ming , Tong Zhi , Wen Yong
Published: February 2012

A poly silk peptide film pH sensor has been developed using zero current potentiometry system. A poly silk peptide film coated pencil graphite electrode is connected in series between the working and counter electrodes of a potentiostat, and immersed in solution together with a reference electrode. When the solution pH varies, the resulting zero current potentiometry is linear with the values of the solution pH in the range of 1.81 to 11.58. This pH sensor shows high stability, accuracy, selectivity and reproduction.
A New Interaction Integral Method for Nonhomogeneous Materials
Authors: Jia Jie , Chen Yuan Yuan , Yu Ling , Li Ming Bao
Published: February 2012

A new interaction integral technique is derived for computation of mixed-mode stress intensity factors (SIFs) in nonhomogeneous materials with continuous or discontinuous properties. This method is based on a conservation integral that relies on two admissible mechanical states (actual and auxiliary fields). In the equivalent domain formulation, the integrand does not involve any derivatives of material properties. Moreover, the formulation is proved to be still valid when the integral domain contains material interfaces. Therefore, its applicable range is greatly enlarged. The method is combined with the extended finite element method (XFEM) to calculate the SIFs for different integral domains. Numerical results show that the interaction integral has excellent convergence for material nonhomogeneity and discontinuity.
Estimating Floor Area Ratio of Urban Buildings Based on the QuickBird Image
Authors: Wu Yi Zhou , Li Bo
Published: February 2012

Floor area ratio (FAR) is fundamentally important for urban economic development and for urban design, planning and management. This paper tried to enhance the texture information of the QuickBird image by using HIS and PCA transform methods in Yiwu city as a case study. An object-based method was proposed to process the enhanced QuickBird image for the shadow of buildings and building object areas, and the building heights were accurately calculated based on the shadow of buildings. The building object areas and heights were integrated with an administrative district map in Yiwu city to estimate FAR. Tests with this above method demonstrated excellent accuracy in terms of FAR estimation. The high spatial resolution images have great potential in quickly and accurately estimating FAR, providing a scientific basis to policy makers and urban planners.
Mechanical Performance Research on Modified Cement Concrete with Recycled Plastic Particles
Authors: Di Jian Hong , Liu Zhan Liang , Li Jun Jun
Published: February 2012

In order to improve the concrete performance and research the greenmaterial, the recycled ABS/PC plastic particles will be added into the cement concrete as a modifier. In this research, the C30 cement concrete was taken as the basic material, the fine aggregate in cement concrete was substituted by different amounts of recycled plastic particles. The change law of mechanical performance indexes（including cubic compressive strength. Splitting tensile strength，bending strength）were researched. The research result showed the recycled plastic particles, as a modifier, can improve mechanical performance of the cement concrete greatly. In the five addition amounts，including 0%, 2%, 5%, 8%, 11%，the three mechanical strengths will all increases at first then decreases with the addition amount increasing. When the addition amount is 5%, the three mechanical strength indexes will all reach the maximum.
A Study of Recycled Polystyrene for Structural Concrete Application
Authors: Outzen Sarah Kayfetz , Chen Cheng
Published: February 2012

Concrete has one of the highest carbon footprints of building materials in use, and is also one of the most often used building materials in modern construction. Polystyrene is a non-biodegradable polymer in continued use. This paper examines the feasibility of using polystyrene beads in structural concrete. Recycled polystyrene beads were used as a coarse aggregate in concrete mixtures to explore possible structural application. Two samples apiece of three experimental mixes of concrete as well as control concrete mixtures were tested in the laboratory for density and compressive strength at 14, 28, 56 and 70 days curing. The laboratory testing showed one experimental mixture was of comparable compressive strength to the control concrete mixture. The experimental results demonstrated that recycled polystyrene concrete in volumetric percentages below 18.75% could be a feasible green concrete mixture.
Theoretical Study on Optimal Design of Thermal Performance of Aerated Concrete-Based Composite Thermal Insulation Wall
Authors: Yang Fang , Sun Lin Zhu , Xie Zi Ling
Published: February 2012

A wall of aerated concrete only can hardly meet the requirements for energy-saving architectural design. If both sides of the wall are provided with thermal insulation mortar to form a composite wall, the heat transfer performance of the wall will be significantly improved. In this Paper, we established an optimization model for the thermal economy of a thermal insulation composite wall according to heat transfer theory and in consideration of the depreciation and maintenance costs of the wall during use, and took the average heat transfer coefficient and index of thermal inertia of the wall as restricted conditions to calculate and analyze the economical thickness of the thermal insulation layer. We expect the optimization model be valuable reference in promoting the application of aerated concrete-based composite thermal insulation walls.
Influence of Reduction Time of SSI on Nitrite Removal from Wastewater
Authors: Li Jun Guo , Li Shou Zhang , Tian Wei
Published: February 2012

Spherical sponge iron (SSI) with high activity and intension could be prepared through direct reduction by hydrogen. To optimize the reduction technology of SSI and its removal ability for nitrate from wastewater, the influence of reduction time of SSI on nitrate removal percentage was investigated. Because the specific surface area was impact smartly by the reduction time of SSI, it was suggested that nitrate removal ability of SSI should declined with the increasing of reduction time once the reduction time longer than the optimized reduction time. When the reduction time was t1, nitrate removal percentage reached to the maximum. When the nitrate original concentration was 5mg-N/L, the reaction order was closed to 0.7 and the apparent reaction rate constant was 0.323 to 0.359 h-1. When nitrate original concentration increased to 50 mg-N/L, nitrate removal reaction appeared to be the pseudo-first-order reaction, and the apparent reaction rate constant was 0.314 to 0.248 h-1.
Public Service Evaluation Based on Fuzzy Analytic Hierarchy Process
Authors: Zou Rong
Published: February 2012

Public service evaluation based on fuzzy analytic hierarchy process is presented in the paper. Firstly, evaluation indexes of public service are analyzed,and the three-layer evaluation indexes structure is composed of these evaluation indexes of public service. A certain public service organization is employed to study the evaluation performance of the proposed fuzzy analytic hierarchy process method,and the evaluation values of second-level evaluation indexes are given.By analyzing based on fuzzy analytic hierarchy process,the evaluation values of the public service are given.The experimental results indicate that the evaluation level of the public service organization is consistent with the actual situation.
Flow Field Distribution and Transmission Effect Based on the Flats-Delivered Device of Friction Spinning
Authors: Ding Shang Yun , Chen Guo Hua , Han Guang Ting
Published: February 2012

The flats-delivered device of friction spinning is based on the rotated airflow delivery. Its basic design principle and flow field distribution are reported in this paper. The paralleled agglomeration effect of the fibers is investigated both theoretically and experimentally.
Research of Protection Technology of Ancient Building’s Information Digital Base on GIS
Authors: Xu Wu Di , Su Kai
Published: February 2012

The one of the ancient building’s important values is the historical and cultural information, in some sense, the protection of ancient building is to protect this information. Take advantage of the technology of information, we collect the information of ancient building, and in the way of database to save the information, achieve the protection of ancient building’s information. Relative to the protection of the actual ancient building, the protection of information could rapid to achieve the goal and reduce the cost. Unexpected disasters often cause serious damage to ancient buildings, only the protection of information could keep the information of ancient building for long time. The information of ancient building including information of the graph and attributes, there are the same properties with the geographical information. Take advantage of the technology of GIS, create 3D graph of the ancient building’s unity, component and structure, and collect the information of material, paint, dimension for each component, establish attribute table, connect the graph with attributes, achieve the integrative management of the ancient building’s graph and attributes. The database which is formed by the protection of ancient building’s information, it is the base which produced 3d virtual and digital ancient building through computer technology, meanwhile, digital information for the purpose of research and protection of the actual ancient building has important reference value.
Study on Key Technology of Frame Structure Building Monolithic Movement
Authors: Zhao Dong Mei , Yao Yan Hong
Published: February 2012

The technology of building monolithic movement is widely used increasingly because it has many advantages, such as low cost, short period and environmental protection. By means of the monolithic movement of frame structure of some teaching building ,under the situation that do not destroy the whole of structure and the function of structure the key technology scheme is introduced,which can offer the technological reference to the simlar movement of buildings.
The Research on Residential Program Design and Energy-Saving Control
Authors: Wang Fu Rong , Fan Ling Chao , Wen Liang
Published: February 2012

In the stage of residential program design, the Energy-saving will be able to serve as an important factor influencing design, the use of computer simulation aided analysis, help architects intuitive judgment the affect of program design on building energy. In combination with the actual case of transformation simulation analysis and design, discuss the Energy-saving control method on the stage of program design.
The Architecture Strategies of Organized Urban Construction
Authors: Zhang Yi Zhong , Zhang Da Wei
Published: February 2012

The organized urban construction often manifests itself in many ways such as patency and ordering to get a clear path. Architecture is a basic frame of the urban formation .This article analyzes some factors that influent the urban organization from the architectural perspective , and explores some architectural strategies to make the construction organized distinctly ,including natural organization , formal organization and contextual organization .
Research on Dwellings with Renewable Materials under Different Geographical Conditions and Climate
Authors: Li Li Ping
Published: February 2012

Field tests for indoor thermal environment of dwellings of different renewable materials under different geographical climate conditions were carried out, and more specifically, the indoor temperature of dwellings with different renewable material walls as well as the surface temperature of building envelope were tested and comparatively analyzed. The test results show the current situations and features of indoor temperature changes of the dwellings of different materials, which may provide a basis for improving the thermal environment of dwellings.
Study on Children's Outdoor Recreational Site Design in Urban Residential Areas
Authors: Xiao Zhe Tao , Gong Wen Ye , Hao Li Jun
Published: February 2012

Urban residential areas are the first communication space that children enter society. Recreational site are integral part of urban residential areas. In the specific planning and design, it is often to be ignored, or adult. This paper analyzes the design requirements of the children's recreational site and studies the site design elements. It hopes to provide a reference for the design of children's outdoor activities in urban residential areas.
Study of the Oxygen Transfer Efficiencies in the Different Methods Used in the Technique of Hypolimnetic Aeration
Authors: Mostefa Gafsi , Ahmed Kettab , Djehiche Abdelkader
Published: February 2012

Thermal stratification of lakes and reservoirs can result in substantial hypolimnetic oxygen depletion, which may have a negative impact on the cold-water fisheries, the drinking water treatment process, and water quality downstream of hydropower reservoirs. Several techniques of aeration are presented in this study, to describe their effectiveness in control of physical and chemical parameters, that compromising the balance ecological and the thermal stratification in water supplies. As a result, we demonstrate that the most efficient hypolimnetic aeration system is the bubble plume diffuser; although an accidental destratification may occur. In hypolimnetic aeration systems, the aeration system by bubble plume appears to be the most economic and perhaps the simplest among the systems used in Stanley lake (Colorado, U.S.A), even as other researches select Speece Cone aeration system, or the full airlift systems, or the TVA line diffuser. The purpose of this study is to show the oxygen transfer efficiencies in the different methods used in the technique of hypolimnetic aeration, and their effect on the preservation of the thermal stratification. As well, this study concentrate on the economic and technical sides associated to these aeration systems.
The Discussion on Service Quality Evaluation Based on SERVQUAL Model Application
Authors: Yang Han Tao
Published: February 2012

Service quality is good or bad is dominated by the many intangible factors. The measurement and evaluation of service quality has been a challenge. The paper is based on the SERVQUAL model which can be used to evaluate service quality. In addition, the paper discusses how to use this method measuring and evaluating the service quality in practice
Game Analysis of People-Post Matching among the Middle Managers in Enterprises
Authors: Liao Te Ming , Du Xiao Mei
Published: February 2012

The middle managers shoulder the important responsibility in the enterprise. The middle managers stress executive capability. But the executive result affects business performance directly. In order to realize strategic objectives, the enterprises must strengthen management and development of the middle managers on the base of people-post matching.The paper analyses the game between the enterprise and the middle managers on the base of the meaning and status of people-post matching. The paper builds the game matrix and portfolio strategy game. The game analysis provides decision basis for the people-post matching and development of the middle managers.
Research for Effects of Product Placement Advertisements Regarding Consumer’s Value
Authors: Lin Sheng Liang
Published: February 2012

This paper aims at exploring consumer’s life value on effects of product placement advertisements in the Chinese film “No Thieves in the World”. In terms of BMW cars in this film, great talent and bold vision, neatness and joyfulness and comfort and vigor of consumer’s values exert great influence on the effects of product placement advertisements while others are not. Great talent and bold vision of consumer’s value exerts the most remarkable influence on the effects of product placement advertisements. It may be that BMW is concerned by those who own social positions to some degree.BMW’s brand personality may play a role in the influence on effects of advertising. We can resort to these three kinds of values in priority when we carry out branding communication of BMW.
A Study on Wear Reliability of Mechanism Based on Performance Degradation
Authors: Cai Jing , Xu Yi Ming , Lin Hai Bin
Published: February 2012

Because mechanism always has the characteristic of high-reliability, long-life and small-sample, performance degradation theory is adopted to study the wear reliability of mechanism. So, firstly the degradation failure standard of mechanism is analyzed; then the distribution of performance parameters is verified by the K-S test; Furthermore, the failure probabilities are calculated based on degradation failure standard and distribution of performance parameters, in order to confirm the wear reliability distribution of mechanism; finally, an example is given to show the validity of this method.
Dynamic Modeling of Ionic Polymer Metal Composite Using Equivalent Passive Electric Network Components
Authors: Samaranayake B.G.L.T. , Preethichandra D.M.G. , Alahakoon A.M.U.S.K. , Kaneto K.
Published: February 2012

This paper presents dynamic modeling of Ionic Polymer Metal Composites (IPMC) using passive electric network components. The dynamic model using standard electric network components is a novel approach to model the transient and steady state voltage and current characteristics of IPMCs. This leads to a global model for IPMCs with fine tunable parameters, which depend on the material properties, the manufacturing process and the physical dimensions of the actuator. The dynamic model has been verified by simulation, system identification and experimental studies.
Characteristic Parameters of Dynamic Crack Growth along the Interface between the Two Orthotropic Materials
Authors: Djokovic Jelena M. , Nikolić Ružica R.
Published: February 2012

In this paper is analyzed the behavior of parameters that characterize the process of a dynamic crack growth along the interface between the two orthotropic materials. The emphasis is placed on the application of the fracture mechanics concept for the interfacial crack that propagates dynamically, at high speed. In this work is considered the behavior of the oscillation index, the traction resolution factor and the energy factor depending on the crack tip speed and the stifnesses ratio. The oscillatory index increases with the crack tip speed and tends to infinity when the crack speed approaches the Rayleigh wave speed of the less stiff of the two materials. The traction resolution factor depends strongly on the crack speed but weakly on the stiffness ratio. The behavior of the energy factor is completely different from the behavior of the traction resolution factor. Results provided in this paper can be used as a guide for micromechanical modeling of materials.
Local Path Planning for Dual-Arm Mobile Robot Shuttling within Truss
Authors: Wu Wei Guo , Wu Peng
Published: February 2012

A new local path planning method for dual-arm mobile robot shuttling within the truss is presented. Like the probabilistic roadmaps method, this method proceeds in two stages: preprocessing stage and path planning stage. In preprocessing stage, the workspace is divided into a set of non-overlapping cubical cells. The nodes in the free workspace are stored in a matrix. In path planning stage, three query strategies are adopted to search the path from start point to goal point. Take use of vertex query strategy, the smooth path can be acquired in a fraction of a second. The algorithm is simple, and is applicable to any static environment with convex obstacles.
A Dynamic Model for Non-Linear Radial Forced Vibration of Unilateral Boring Tools and its Application to Improving the Accuracy of Boring Process
Authors: Li Peng , Gu Li Zhi
Published: February 2012

By analyzing factors affecting the accuracy of boring process on the precision boring machine, the article aims at putting forward a method of improving the accuracy of boring process by means of installing polymer elastic shock absorbers on unilateral boring tools. In addition, the situation of non-linear radial forced vibration is formulated by a dynamic model of second-order differential equation. Based on the model, vibration prevention principles of unilateral boring tools have been discussed and systematic parameters have been optimized for enhancement of the boring process accuracy.
A New Design Based on Common Structures for Indoor Computer Wireless Communication System
Authors: Liu Qi
Published: February 2012

From several basic structures for indoor computer wireless communication system, a new type of system structure was designed. Its conformation of optics system and achievement by module were described particularly through using Fresnel lens system. This system’s link could be transformed between directed LOS link and non-directed LOS link, which made the system communicate at a high-speed when there were no barriers between the emitter and receiver and keep a good convexity when barriers appeared. At last what should be noted for the analogue simulation was brought up.
Study on the Shifting Model of Edge Drop Control in Ultra-Wide 6-High Tandem Cold Rolling Mill
Authors: Cao Jian Guo , Wang Yan Lin , Li Hong Bo , Song Mu Qing , Jia Sheng Hui , Gong Gui Liang
Published: February 2012

Edge drop is an important quality evaluating index for strip cross-section with the increasing of requirement for higher gauge accuracy to meet customer's demand. The mathematical model of roll shifting system plays an important role in controlling the edge drop on modern tandem cold rolling mills. Based on the explicit dynamic finite element method, a 3D finite element simulation model of rolls and strip is established for a large ultra-wide 6-high cold rolling mill with the developed EDW (edge drop control work roll) and the matched CVC intermediate roll to investigate the effect of work roll shift on edge drop of strip. Considering on the characteristics of EDW work rolls, equivalent area compensated method has been put forward to build the shifting model for edge drop control. The results indicated that the values of edge drop are less than 7μm by using the proper shifting model and the shifting model can be used to guide the practical production.
Transient EHL of Two Surfaces under Elliptical Contact with Non-Newtonian Lubricant
Authors: Mongkol Mongkolwongrojn , Jesda Panichakorn
Published: February 2012

This paper presents the effects of a sudden load change and sudden speed change on the performance characteristics of two surfaces under elliptical contact with elastohydrodynamic lubrication. The non-Newtonian lubricant for the research work are modeled based on Carreau viscosity model. The time dependent modified Reynolds equation and elastic equation were formulated for compressible fluid. Perturbation method, Newton Raphson method and full adaptive multigrid method were implemented and solved to obtain the film pressure, film thickness profiles and friction coefficient in the contact regime at various applied loads and speeds. Simulation results show the friction coefficient increase significantly under sudden loads. The minimum film thickness and friction coefficient both decrease significantly as speed is decreased.
Coupled Analysis the Segmented SRM Internal Flow Field with Influence of Inhibitor Deformation
Authors: Gao Shuang Wu , Qiang Hong Fu , Zhou Wei , Wu Peng Peng
Published: February 2012

The coupled influence between structure and internal flow field will make the pressure oscillation during working process of the solid rocket motor. This coupled effect will bring the dynamic press on the payload and extremely destroyed the payload. For researching the influence of internal flow field by the deformation of inhibitor, the parallel fluid structure interaction method with the large eddy simulation model was used to analyze the solid rocket motor with segments. The results show that the deformation of inhibitor will influence the internal flow field parameter’s distribution and enhance the pressure frequency and amplitude remarkably. The partitioned method could solution the fluid structure interaction problems in the segmented solid rocket motor properly.
Optimization of a Hydraulic Damper Performance with the Use of Fluid-Structure Simulation
Authors: Jakubowski Dawid , Gnilka Jacek , Wszołek Grzegorz , Czop Piotr
Published: February 2012

The aim of this paper is to develop a method for optimizing the design of a spring valve system by reducing the aeration and cavitation effect which negatively influences the performance of a shock absorber. A fluid-structure interaction (FSI) model is used in order to modify the geometry of the valve interior and, in turn, to achieve better performance in shock absorbers. The paper analyzes the pressure distribution along the flow paths inside the valve cavity to reduce the risk of aeration and cavitation, while other important engineering aspects are omitted, e.g. durability of disc-spring valve systems as discussed in [1]. The objective of this work is to show key steps of the simulation process focusing on interactions between fluid and structure domain and to review relevant simulation results.
The Relationship between Tensile Ductility Loss and Microstructures for the Hot Exposed γ-Tial Alloys
Authors: Jing Yong Juan , Li Xiao Hong , Yue Xi Shan
Published: February 2012

In this paper, the relationship between the tensile ductility loss and the conditions including the exposure process and microstructures for the hot exposed TiAl alloys was researched. The critical temperature corresponding to the ambient tensile ductility loss to 0.8% was sensitive to the microstructure. It was 800°C/100h exposure for the near fully lamella microstructure. Due to the oriented lamella, the near fully lamella microstructure was benefit for forming the oxide layer rich in Al to present further oxidation of the matrix.
Analysis on Flow Behaviors of Stepped Horizontal Well through Multi-Independent Fault Blocks
Authors: Ren Lan , Zhao Jin Zhou , Hu Yong Quan , Li Nan
Published: February 2012

Based on the fluid dynamics and seepage mechanics, a mathematical analysis model in which the wellbore flow has been coupled with reservoir flow is established for the stepped horizontal well through the oil layers in three independent fault blocks. In the model, the reservoir flow is considered to be unsteady-state and wellbore pressure drop calculation model is established considering the influence of the on-way influx by using mass conservation principle and the theory of infinitesimal line congruence. Taking different curvature radius into account, a pressure drop calculation method is put forward for the layer-layer connective segments. With the mathematical analysis model, the flow behaviors of stepped horizontal well through multi-independent fault blocks has been analyzed and suggested by the calculation results, the optimal arrangement with good oil layer close to the heel side and the poor close to the finger is recommended for the minimum wellbore friction and the highest production.
Research on the Cleaning Technology of Sapphire Substrates Precision Process for LED
Authors: Zhou Hai , Bei Li Gang , Zang Yue , Xu Xiao Ming , Zuo Zi Guo
Published: February 2012

The signification of the cleaning of sapphire substrates in precision processing has been presented. The cleaning principles of sapphire substrates have been discussed. The cleaning solution and technology of the sapphire substrates for international production have been presented by cleaning experiments. The size of dust is smaller than 0.13 . The sum of dusts is less than 5 for every substrate. Sapphire substrates can be used in metal organic chemical vapor deposition of GaN without re-cleaning by this method.
Study on Bonding Properties of Copper and Aluminum in Nano Scale Using Molecular Dynamics Simulation
Authors: Hsu Quang Cherng , Cheng Yen Yu , Liu Bao Hsin
Published: February 2012

According to MD simulation results, pressing depth between two bonding materials will affect bonding strength. Alloy material (Al0.9Cu0.1) had void defect phenomenon in low bonding speed condition because the increasing chance of atom migration which will result in low bonding strength. High tensile speed causes material fracture phenomena earlier happen than low speed. Material stress in low speed is smaller than in high speed. Fracture morphology of material is different in different tensile speed. In low speed condition, material can be stretched thinner than in high speed condition. Material in high temperature has greater kinetic energy than low temperature; therefore, material in high temperature has better formability and behaves larger tensile strain than low temperature. For pure aluminum, when temperature raises to 900K which is close to melting point (933K), its crystal structure is no longer belongs to F.C.C. structure, so bonding strength is weaker than low temperature. Large size material has larger contact area than small size material; therefore, the tensile force and tensile strength of the former are larger than the latter. The order of bonding strength for these three materials is: binary alloy > pure copper > pure aluminum.
Wavelet Analysis of Transient Signals of Structural Responses to Impulsive Loads
Authors: Zhou Qing , Yang Xia , Mao Yong Jian , Deng Hong Jian
Published: February 2012

Based on a brief introduction to elementary theory of wavelet analysis, the disadvantages of wavelet method and wavelet packet method are given. A new wavelet analysis procedure is proposed for decomposition and reconstruction of measured transient signals. This method can search by specific frequency paths, then overcomes the shortcomings of uniform frequency intervals in pure wavelet analyses and of large computational costs in common wavelet packet analyses. As examples, a signal-noise separation and a weak signal extraction are given to show the effectiveness of the new procedure.
Modal and Seismic Analysis of ITER Soft X-Ray Diagnostic Camera
Authors: Wang Song Ke , Hu Li Qun , Song Yun Tao , Chen Ye Bin , Chen Kai Yun
Published: February 2012

International thermonuclear experimental reactor (ITER) soft x-ray (SXR) diagnostic camera is an indispensible component used to measure signal intensity of SXR, which can reflect the internal properties of plasma. In this paper, the preliminary structural design and working principle of SXR camera is demonstrated, to investigate its seismic performance, modal analysis has been performed to obtain natural frequencies, effective mass and mode of vibration in first ten modes by means of ANSYS software. Then according to two parallel seismic analysis methods used in ITER, the calculations have been performed and the corresponding results have been illustrated respectively, the stress intensity and displacement are all within the allowable margin, which indicates that the design is reasonable and feasible. It will also provide beneficial reference for subsequent work.
Predicting Compressor of Gas Turbine Power Plant On-Line Washing Interval Using Proportional Hazards Model
Authors: Zhu Lei , Zuo Hong Fu
Published: February 2012

Due to compressor fouling, gas turbine efficiency decreases over time, resulting in decreased power output of the plant. To counteract the effects of compressor fouling, compressor on-line and off-line washing procedures are used. The present research is aimed to propose a method of mathematical modeling of offline washing interval which will be estimated as the RUL of compressor based on Proportional hazards model. Application of the proposed prediction method to the case of Civil Aero-engine proved its effectiveness.
Application of the Work Study to Balancing Hydraulic Component Assembly Lines
Authors: Li Wen Li , Song Chun Lei , Han Li Sha
Published: February 2012

This paper applies the methods of Work Study to a certain hydraulic component company. We apply the work measurement method to measure the work time of various stations of assembly lines, and to find out both the bottle neck stations and the superfluous capability stations effecting on the line assembly capability. Basing on the principle of ECRS (Eliminate, Combine, Rearrange, Simple) and the line balancing theory, this paper provides the line balancing schema, including the improvement of the existing equipment, the reallocation of the work content for relative stations, the adjustment of the equipment and workers of some stations, the reduction of machine working time of some stations and the change of assembly line layout etc. After being improved, the work time of the bottle neck and other processes are controlled near the Taking Time. Comparing with the former assembly line, the production capability of assembly line improved up 45.6% and workshop condition is also improved.
Permissible Deviation of Rotation Center Based on Fan-Beam Projection ICT System
Authors: Liu Feng Lin , Kang Quan , He Bing
Published: February 2012

For ICT wide fan-beam scanning, there is a geometrical supposition that the object rotation center and the radiation source center intersect the image reconstruction center. In practice, the existing intersection deviation has influence on the image reconstruction precision. The image reconstruction mathematical model for shifted rotation center was established, and the relationship between the deviation error and reconstructed image precision was studied by simulation. As a result, for 512×512 CT reconstructed image, there is no distinctive difference between the reference image and the reconstructed image with eccentricity 0.1 pixels; however, with 0.2 pixels or more, the difference is obvious. So, for 512×512 CT image, the maximum permissible deviation of the rotation center is within 0.1 pixel dimension.
Removal Characteristics of Hillock Defects on Silicon Substrate by Chemical Uniformity Etching Enhanced Polishing Slurry
Authors: Sun Ming , Wang Juan , Wang Ru , Liu Yu Ling , Yang Li Bing , Lin Na Na , Li Ying Zi
Published: February 2012

The thermally generated defects will lower the life time in bulk silicon and cause increasing in the leakage current of individual diodes in integrated circuits, that will finally cause the malfunction with advanced devices and IC chips. The removal characteristics of hillock defects on the single bare silicon wafer generated by the thermal process were experimentally analysed with respect to the chemical additives enhanced uniform chemical etching and mechanical abrasion of high pure nano sphere colloidal silica interplaying with the alkali based polishing slurry. During the polishing, it was found that the silicon surface contacted with high speed of rotated polishing pad under the down force pressure is chemically dissolved by the slurry containing FA/O organic polyamine(R(NH2)n) agent with adding proper proportional FA/O I non ions surfactant, which effectively lowered the surface strain of slurry contacted to the reactive surface of the wafer and slurry enhanced uniform chemical etch leading to the hillock region and no hillock region. However, by the process of chemical mechanical polishing，the results show it can eliminate the hillock defects on the surface of silicon wafer thoroughly with high removal rate, and achieve lower surface roughness than before process of polishing.
Research on Health Assessment of Hydraulic Pumping Source System for Civil Aircraft
Authors: Jia Bao Hui , Yang Zheng Qing , Sun Ze Dong
Published: February 2012

Aiming at the high fault rate and the problem of high fault harmfulness of civil aircraft hydraulic pumping source system, the fuzzy synthetic evaluation algorithm is researched. Aiming at the complex system, more influenced factors, the analytic hierarchy process (AHP) is presented to establish the weight set. Aiming at the real-time need of health assessment, the expert system is used to build membership function. Finally the method is validated by a set of data of that system.