bluuebunny/crossref_metadata_2025 huggingface dataset:
3D CAD Model Retrieval Based on Oriented Bounding Box and Normals Distribution
Authors: Chen Qiang , Yu Yong Mei
Published: January 2014

Shape Distribution (SD) describes the global feature of 3D CAD model which can be used to distinguish one model from others. But sometimes, different models may have the similar SD features. In this case SD is not suitable for 3D CAD model retrieval. Although two models have the same SD features, their oriented bounding box (OBB) and normals distribution may differ from each other. In this paper, a new algorithm based on OBB and normals distribution is proposed to tackle this problem. SD feature is used for initial retrieval, then OBB and normals distribution are used for fine retrieval. Experimental results indicate the efficiency and feasibility of the proposed method.
Construction and Enumeration of Steiner Triple Systems with Order V
Authors: Xu Zhao Di , Li Xiao Yi , Chou Wan Xi
Published: January 2014

This paper describes the basic concept of constructing the large sets of Steiner triple systems of order v. It proposes a method of constructing the large sets of Steiner triple systems by using permutation of original matrix, and it presents entire procedure of constructing the large sets of Steiner triple systems of order 7. It verified the number of disjoint Steiner triple systems.
Research on the Architecture of Shaanxi IoT Industry Chain
Authors: Yang Xiao Xun , Li Jia Jun
Published: January 2014

The paper analyzes the development status of Shaanxi IoT industry based on PEST method. Then, the paper delves into Shaanxi IoT industry chain architecture, and points out the problems of Shaanxi IoT industry chain, and finally puts forward proposals to improve Shaanxi IoT industry chain.
Methods of Constructing and Enumerating the Spanning Tree of a Connected Graph
Authors: Xu Zhao Di , Li Xiao Yi , Chou Wan Xi
Published: January 2014

A definition concerning the spanning sub graph and spanning sub graph circle is given. Use the enumerating methods of spanning sub circle; seek out the spanning sub graph of spanning trees. The theorems of constructing and enumerating the spanning trees are proved. The methods of enumerating and constructing connected graph spanning tree are proposed. The application examples of construction theorem and enumerating theorem are given. the spanning sub graphs number of five plane graph and the construction of Constituent sub-graph are introduced, thus verifying constructing and enumerating theorem are useful and effective. This method Is a Simple and easy method to construct the spanning tree of connected graph.
Mechanical Performances of Aluminum Cellular Metal with Kelvin and Cubic Structure
Authors: Dang Xiao Bing , He Kai , Li Jiu Hua , Feng Wei , Du Ru Xu
Published: January 2014

The mechanical performances are studied for the aluminum cellular metal through finite element analysis (FEA) method in the paper. Cellular metal is a kind of complex structure with good performances using in many fields. The paper analyzes three different kinds of regular cellular metal structures, including two Kelvin structures and one cubic structure. The models of the three structures are established in CAD system. The mechanical performances under different directional forces - namely normal, 45-degree and shear forces - are simulated through FEA. Both the elastic and plastic performances are taken into consideration. The result shows that the stiffness of the cubic cellular structure is the strongest among the three structures. All the three structures could hold more normal force than the other two directions. The yield stress of the cubic structure is bigger than that of the staggered Kelvin structure.
A Resistance Model of Carbon Fiber Composite Materials Based on Interfacial Effect
Authors: Wu Jing , Xu Ai Qin
Published: January 2014

Based on the single fiber pull-out testing, the resistance of carbon fiber cement increases during the tensile test in elastic stage. Through the experiment, The fiber embedded length shorter, sample pullout strength is greater. But the resistance change rate is smaller, the lower the sensitivity of the sample. So, considering the fiber length and interface set interface effect of carbon fiber reinforced cement based composite resistance model. A simple model was proposed to explain the mechanism of compression sensitivity of carbon fiber reinforced cement-based composites based on interface effect. The results showed that the content of carbon fiber and interface strain can change the sensitivity of CFRC.
The Development and Application of Superfine Shaped Acrylic Fiber on Bedclothes
Authors: Tian Xiao Di , Ge Cai Hong , Bi Jian Wei , He Rong , Zhang Hong Xia
Published: January 2014

The paper use new environmentally friendly raw materials superfine shaped acrylic fiber as weft and silk as warp to design the weaves and patterns on fabric .The products designed is suitable for developing into bedclothes fabrics with good air permeability and thermal performance.
Test Study on Interface Properties between Different Geogrids and Clay
Authors: Zhu Xu Fen , Wei Jun Yang , Wang Bao Tian , Zhang Yong Li
Published: January 2014

With the rapid development of reinforced earth technology, different reinforced materials are also gradually applied to Reinforced earth. In this paper, we focus on the need for the study of interface characteristics between different reinforced materials and clay, by making indoor drawing test with two kinds of reinforced materials commonly used in engineering and the same clay. The test results show that: the drawing strength between the two reinforced materials and clay both increase with the normal stress increasing, both of their strength envelopes are straight lines; In the drawing test between the warp knitted geogrid and clay, the cohesive strength is 6.65kPa, the friction angle is 21.03°; while the drawing test between the geonet and clay, the cohesive strength is 2.9kPa, the friction angle is 10.96°; The average tensile strength of warp knitted geogrid is 26.4% of genet's, while the drawing strength of warp knitted geogrid in the test is about 48.1% of genet's, so when chosing reinforced materials in some engineerings, it is an important factor that we must consider the particle size and gradation of the filled reinforced materials, selecting the most appropriate size effect.
The Influences of Different Temperature Histories on the Assessment of Cracking Resistance Based on the Concrete Thermal Stress Test
Authors: Song Xue Feng , Wang Ying Fei , Li Chao
Published: January 2014

This paper studied the influences of different temperature histories on the assessment of cracking resistance based on the thermal stress tests, and also initially considered and discussed the effects of several empirical tests on thermal stress tests, including approximate adiabatic heating mode, temperature control mode, archived data matching mode, followed by some proposals regarding the standardizing research of thermal stress test of concrete.
Seismic Performance Research of Viscous Dampers under Different Arrangement
Authors: Zhong Teng Fei , Yu Bai , Wu Guo Qiang
Published: January 2014

This paper introduces a variety of viscous damper installation form, including brace, herringbone and cantilever wall installation. By an example, install the bracing form, herringbone installation form and type cantilever wall installation condition are compared, And to calculate the results of its damping effect has carried on the comparative study, The superiority of the cantilever wall type layout pattern is obtained.
Compressive Strength Tests of Recycled Green Concrete Containing Ground Granulated Blast-Furnace Slag
Authors: Sun Jia Guo , Gu Yan Ling
Published: January 2014

This study used waste concrete as a recycled coarse aggregate and added an appropriate proportion of groundgranulated blast-furnace slag (GGBFS) to formulate recycled concrete. Based on the recycled coarse aggregate and GGBFS content, 24different mixture ratios were formulated, and then an experimental study of the slumpand compressive strength of the mixtures was conducted. The results showed that because slag can improve the physical and mechanical properties and performances of ordinary concreteand can compensate for certain natural deficiencies occurring in recycled coarse aggregate,GGBFS and recycled coarse aggregate can form recycled aggregate green concrete with a slump of 170mm and a 28-day compressive strengthof 50MPa.
Analysis on Ground Vibration Induced by Subway under Three Track Structures
Authors: Shen Dao Ming , Zhang Lai Dong , Xia Jin Hong , Xue Song Tao
Published: January 2014

On the purpose of investigation for damping effect of different track supporting, In-situ experiments of vertical ground vibration acceleration induced by underground railway traffic under three track structures were performed at line 8 in shanghai. Time history and 1/3 octave for ground vibration were analyzed and the variation between ground vibration and track supporting structure as well as train velocity was summarized. The results show that reducing vibration effects of different track structure is determined to its own stiffness, various track velocity has little influence to VLzmax of ground vibration. The study result in this paper has important theoretical significance and reference value for the application of track structure in vibration reduction of subway.
The Importance of the Appearance Image and Cognition of Green Building
Authors: Su Ying Ming , Tsai Yi Ping
Published: January 2014

When global climate change becoming a problem that is getting worse nowadays, Green Buildings have become one of the major solutions to maintaining a sustainable environment. Because most of the public interpret the messages sent by their environment through visual appearance and images, This study aims to analyze the appearance effects of U.S. LEED and Taiwan EEWH Green Building rating systems by conducting surveys on the publics cognition of green building appearances and green building rating systems, and analyzing the relationship between green building appearance and environmental cognition. The results indicate that building appearance is a key judgment reference for identifying green buildings. However, there has been no significant relationships found between green building rating system and green building appearances so far, which may cause confusion as to the publics cognition and image of green buildings. Therefore, it is recommended that building's appearance image should be included in future revisions of the green building rating systems.
The Study on Digital Fabrication System in the Construction Process
Authors: Liang Shuang , Gao Ming , Wang Shao Jun , Zhang Lian Zhen
Published: January 2014

Generating complex forms with the computer has become easier however a challenge still lies in the realization of these forms. Realize the digital fabrication face two challenges: first, how to evaluate the assembly ability of the design; second, how to realize digital fabrication combine with the Traditional technology. This paper introduces that the assembly ability evaluation ideas on design by the method of the combination of System Dynamics and association graph, and it needs to pay attention to the value added chain process fusion with the traditional mode of production in the process of evaluation.
Empirical Study on Highway Subgrade Construction Scheme Design
Authors: Zhang Xiao Yan
Published: January 2014

The construction organization design is the engineering design of infrastructure projects in the bidding and construction phase of the technical documentation must be submitted. Whether the construction organization design for high-quality, efficient, timely, low consumption of tasks to complete highway construction plays a decisive role.
Analysis of Apple’s Design Management Policy
Authors: Pei Hui Ning , Yu Sui Huai , Tian Bao Zhen
Published: January 2014

Apple Inc. is a famous American multinational corporation. It has unique corporate culture and design management policy. Apple creates iPod and iTunes, Mac laptop and desktop computers, and the revolutionary iPhone and iPad. In 2007, Apple achieved widespread success with its iPhone, iPod Touch and iPad products which are popular worldwide and sought after by a great number of consumers around the world. Author holds that Apples successful corporate culture and design management policy are the success reasons. Therefore, this paper attempts to extract the successful experience of Apple's design management through in-depth summary and analysis.
Customized CAD System Design Based on GMDH Method for Racing Bikes
Authors: Cheng Xu Qi , Liu Hai Yun , Yang Cun Li , Wang Jian Hua
Published: January 2014

A set of customized CAD application system based on GMDH method for racing bike frame is developed by summarizing the characteristics of man-machine engineering principle and bike sports, taking self-organizing data mining method of using Group Method of Data Handling (GMDH) as well as AutoCAD as platform. The system with functions of customized design of bike, parametric design drawing and rapid automatic modeling improves the design level and efficiency of bike frame.
A Study of the Innovative Design of Picture Book Creation Using Mixed Media
Authors: Lin Rui Lin
Published: January 2014

This study performed the creation using mixed media of innovative technology combining hand drawing and computer graphing, with the learning topic being the picture books from the basic design curriculum for the students from the Department of Commercial Design of a Technology University. The works were presented orally by the students and the results were exhibited. The works were evaluated by two teachers with specialties in design. The work with the best performance was Best Memory. The story was about how a girl had grown up. This book is suitable for parents to read with their children and educate their children using this opportunity. The images in the book are colorful and vivid, showing the family members love and best wishes for the newborn. This story can be used to teach children to care about and help newborns, making this book both entertaining and educational.
Connector Structure-Based Modeling of Assembly Sequence Planning
Authors: Su Ying Ying , Liang Di , Dong Hai
Published: January 2014

Assembly Sequence planning is one of the important stages during the product manufacturing process. For the purpose of effectively reducing the degree of complexity and improving the efficiency, the modeling method of assembly sequence planning based on connector structures is proposed. The concept of connector structure is presented, which is regarded as basic assembly units to cover features of assembly parts and package functional parts and connectors. The model of assembly sequence planning is built, which represents the precedence constraint relationship among connector structures. Finally, an example is studied and the model of assembly sequence planning based on connector structure is built to illustrate the effectiveness of the modeling method.
Risk Assessment of Cascading Failures in Power System Based on Fuzzy Theory
Authors: Zhang Fu Chao , Huang Jia Dong
Published: January 2014

This paper makes a grading of the probability of cascading failures using the theory of fuzzy C-means clustering to implement the level of risk assessment. Then from the perspective of power system transient security, use the specific severity functions to grade the probability of cascading failures, and the synthetical severity is graded by fuzzy theory. Finally, synthesizing the probability of cascading failures with the severity of failure, and the level of risk assessment is determined according to the principle of the maximum membership. Finally, taking IEEE 39 system for example, to assess the level of the risk of cascading failures in power grid, thus the rationality and effectiveness of the proposed algorithm are verified.
A Model of the Driving Fault Tolerance of Traffic Management and Control Facilities at Urban Intersections
Authors: Chen Mei Ru , Pei Yu Long , Hu Li Wei
Published: January 2014

This paper presents a solution to calculate the traffic management and control facilities fault tolerance ability to driving mistakes due to drivers fault in perception, judgment and operation. Firstly, according to Shannon information theory, the information volume of eight types of contents on transportation management and control facilities are calculated. The total information volume of these eight types of contents is the basic driving fault tolerance of the facilities. Then, the right rate that facilities set and designed, driver conditions and transportation conditions are screened out for correction coefficients. Finally, the actual driving fault tolerance is given by the product of the basic driving fault tolerance and the three correction coefficients. The solution is useful to evaluate the intersection safety level.
Consideration of Planning a Mobile Hybrid Operating Room
Authors: Zhao Xiu Guo , Xu Xin Xi , Niu Fu , Liu Zhi Guo , Wang Hui Jie , Ren Xu Dong
Published: January 2014

Mobile operating room plays a very important role in treating patients in natural disasters such as earthquake and tsunami. However, development of surgical technology in the 21st century provides the opportunity for constructing a mobile operating room, which is also increasingly dependent on demonstrating safety, efficacy and cost effectiveness. Success in planning an efficiently mobile hybrid operating room many factors must be considered including pace limited, workflow, protocols, equipment and ergonomics. This paper will present several considerations of setting up a mobile hybrid operating room.
The Impact of Initial Allocation of Carbon Emission Rights on Power Generation Replacement Analysis Model
Authors: Tan Zhong Fu , Lei Tao , Li Huan Huan , Ju Li Wei , Chen Zhi Hong
Published: January 2014

Rational scheme of initial allocation of carbon emission rights is the key to the smooth running of carbon trading market. Based on the traditional carbon emission rights allocation mode, this paper combining China’s actual development of power industry and characteristics of the distribution of generation resources, put forward the impact of initial allocation of carbon emission rights on power generation replacement analysis model. By studying the impact of initial allocation of carbon emission rights on power generation rights trade, and comparing the different results of power generation rights trade, respectively, based on installed capacity allocation and power generation allocation, it is found that the mode that based on power generation allocation can better promote the power generation rights trade.
A Study on Semantic Design of Speakers
Authors: Han Jun , Peng Peng , Li Xiang Wen
Published: January 2014

With the rapid development of modern society, human demands for the function and culture connotation of product are quietly changing. Product is not only the carrier of some function, but also the form of spirit and culture. Product semantics is established on the basis of semiotic theory. It emphasizes that product should not only have the physical function, but also be able to reveal or imply users to know how to use from its form. At the same time, product should have a symbolic meaning that can reflect the spirit and consumption cultural of consumer and make product have profound connotation. This paper researches speakers from product semantics in order to design the creative and connotative speaker to content people with deep demand.
Risk Analysis of Marine Riser Based on Improved Fuzzy AHP Method
Authors: Yu Shu Rong , Liu Xue
Published: January 2014

Abstract: Many marine riser risk factors in service were analyzed and the riser risk factor hierarchical structure was modeled, the weight of each riser risk factor was evaluated by the improved fuzzy analytic hierarchy process (AHP) method. The simulation results and accident statistics from both home and abroad are in good agreement. It proves that the method has good practicability, more scientific, reasonable and simple than the traditional fuzzy AHP. The results provide theoretical reference for maintenance and management, danger elimination and reinforcement of marine riser.
Study on Information Asymmetry and the Risks Initiated by it in the Supply Chain Finance
Authors: Qiu Guo Fang , Zhang Yun , Wang Chong
Published: January 2014

From the perspective of commercial banks, put the financial supply chain in the principal-agent relationship which is multi-agent and of multiple sections. This paper analyzed the principal-agent relationship between different subjects and commercial banks and information asymmetry. Secondly it also analyzes the information risk of supply chain finance caused by asymmetric information from in three aspects as risk types, risk behavior and risk loss. Finally it gives the Suggestions and countermeasures aimed to financial risk in supply chain information. It provides reference to main body understanding and the information risk of supply chain finance.
A Study on the Future Development Trend of Virtual Clay Technology
Authors: Suo Xin Yu , Hu Rui Bo , Xu Ren Ping
Published: January 2014

rapid and efficient product design nowadays is one of the crucial researching fields of design methodology. The invention of virtual clay technology FreeForm is absolute a beneficial supplement to computer-aided design. Therefore, this thesis finds its value in enriching the modeling method in computer-aided design, especially in the perspective of integration between surface and fast modeling and production, a quick response to the demand and change in market.
Postal Universal Service Fund Collection Study from the Express Industry in the Information Age
Authors: Han Jun Tao , Yuan Chun Hui
Published: January 2014

The express industry has developed rapidly as e-commerce is becoming to be more and more popular. The contradiction between express delivery industry and postal universal service obligation is inevitable. A collection standard of universal service fund currently has a larger dispute. This article constructs a stackelberg game model based on the dominant operator and competitive postal operator through the theoretical analysis with the postal and courier companies "asymmetric" competition, and the rationality of the fund is discussed according to the express delivery business to impose and standard, etc. Using the method of reverse solving equilibrium results, it shows that the scheme has certain feasibility, but levy must be relevant conditions.
Power System Cascading Failure Risk Assessment Model Based on Graph Theory
Authors: Zhang Fu Chao , Huang Jia Dong
Published: January 2014

In recent years, large-scale power blackouts occur frequently in power system, resulting in extremely serious economic losses and social impact [. Scholars from various countries have made various levels of analysis on the causes of widespread blackouts from different angles [2-.The results show that most of the fault are caused by the cascading failure, and the linkage and relevance between failures are typical of such events. Accordingly, to strengthen the analysis of cascading has important significances on preventing the occurrence of large-scale power blackouts.
Analyzing and Constructing the Operation Mechanism of Industry Technology Alliance
Authors: Cong Hai Bin
Published: January 2014

£oSince 1980s£¬ the industrial technology alliance has become an effective way of all countries to optimize technology resources and to promote the transformation of scientific and technological achievements1But in the actual operation process of industrial technology alliance£¬because of the lack of reasonable and efficient and sound operation mechanism of support£¬there is a widespread conflict in the industrial technology alliance about interest£¬ trust and management etc£¬ these factors caused the low inefficient operation of alliance and hindered the functions1Based on this£¬ the article from the meaning of operating mechanism to analysis and definition the connotation of the industrial technology alliance operational mechanism£¬ on this basis£¬in order to provide reference for the constructing of the industrial technology alliance operation mechanism£¬this article proposed constructing thought of the industrial technology alliance operation mechanism based on stage of development of the industrial technology alliance and elaborated its content.
The Effective Management of Chinese Enterprise Procurement through Research
Authors: Tian Mei Li
Published: January 2014

the specific content of enterprise purchasing management including, set procurement goals, develop procurement system, clear authority, hiring of procurement staff, design related purchasing process and form, and draw up plan and budget and so on. To strengthen the management of Chinese enterprise procurement needs from establishing modern enterprise purchasing management idea, standardize procurement process, procurement, developing e-commerce for procurement outsourcing, a purchasing alliance, strengthen the management of suppliers, strengthen procurement control, to speed up the purchasing information construction, etc.
Inactivation of Bioaerosol in Indoor Air by DC Corona Discharge
Authors: Kang Y. , Ying H.C. , Shao W.W. , Wu Z.C.
Published: January 2014

A novel DC corona discharge technology was applied on inactivation of bioaerosol in indoor air. A wide range of initial concentration of microorganisms (from 35×104 CFU/m3 to 3×106 CFU/m3) was tested to show excellent germicidal properties for its high inactivation efficiency. Over 99.997% of microbe into the reactor were inactivated at t=150s, EP 2kV/cm and initial population was 3.0×106 CFU/m3. The effects of active species produced by a DC corona discharge on the inactivation of a mixture of bacteria in flowing aerosol were proved. The active radicals like OH radical which acted on microbes in the way of direct oxidation were the most significant factors influencing the microbe inactive efficiency through the assessment of heat variety, ultraviolet emission and ozones generation. The active radicals generation in the process of sterilization can be simply controlled by regulating applied voltage before ozone generated. The results indicate that use DC corona discharge technology in the future application of indoor air decontamination.
Research on Reliability of Urban Agglomeration Transport System after a Disaster
Authors: Wei Zheng Mao , Zou Xiang Li , Li Min , Li Wei , Li Cheng Bing
Published: January 2014

In view of the phenomenon that the affected area is broader, more severe losses and more difficult to relief in the urban agglomeration after major natural disasters,it is proposed that transport system reliability calculation method which based on BP neural network model.First of all,analyze the urban transport system network after a disaster, using the weight contribution rate analysis method to extract the key nodes in the network; Second, re-integrating the extracted nodes and establishing a new road network model which based on BP neural network;Then, using the cut set algorithm computing network reliability, and combined with the extent of damage of the road network after a disaster, putting forward the calculation method of urban agglomeration road network reliability after disasters; Finally, for example as changsha-zhuzhou-xiangtan urban agglomeration, examining the authenticity of the method.
An Area Growth Model of Eichhornia Crassipes with Application to Lake Ecosystem Restoration
Authors: Sun Ling , Zhu Ze Sheng
Published: January 2014

The aim of this study was to investigate the use of a model to determine growth properties of Eichhornia crassipes in lake ecosystem restoration, in particular Eichhornia crassipes area. A logistic model was constructed to eatimate the area of Eichhornia crassipes and tested in Eichhornia crassipes samples. The area of Eichhornia crassipes was measured nine times in experiment period using GPS and satellite remote sensing images. The measurements were shown to lead to a determination of the parameters of accurate logistic model with an overall Goodness of Fit Index of 0.9753. This indicates that there is a possibility of obtaining accurate Eichhornia crassipes area from the logistic model and suggests that it is possible to implement lake ecosystem restoration with harvesting Eichhornia crassipes to remove the nutrient in lake.
Comparison of Different Means to Determine Postcrash Velocity in a Real-World Vehicle-Pedestrian Accident
Authors: Su Sen , Liu Wen Jun , Wang Fu Ping , Li Kui , Yin Zhi Yong
Published: January 2014

In road traffic collisions, the majority of victims are pedestrians in many countries. Claims in vehicle-pedestrian collision often have to be settled in court. The most concern of vehicle crash accident reconstruction is to retrieve the postcrash velocity. In this study, the conventional methods and Event Data Recorder (EDR) were applied to determine postcrash velocity in a real-word vehicle-pedestrian accident. The study showed limitation and scientific rationality of the conventional methods, and the EDR data of this accident was verified at the same time.
Comparison of Constitutive Laws on the Modeling of Thermo-Viscoplastic Behaviour of an Aluminum Alloy
Authors: Chu Xing Rong , Leotoing Lionel , Guines Dominique , Gao Jun
Published: January 2014

The accuracy of simulation result depends greatly on the implemented hardening law. An appropriate hardening model should be able to describe the coupling effects of the strain, strain rate and temperature on the flow stress of the material. Based on the stress-strain curves obtained from uniaxial tensile tests, two different types of hardening models (power law and saturation) are proposed to describe the flow stresses of an aluminum alloy AA5086 under different temperatures (20, 150 and 200°C) and tensile speeds (1, 10 and 100 mm·s-1). The correlation results are compared to experimental data and the roles of the hardening models in predicting the material flow stress are compared and discussed.
Atmospheric Corrosion of AZ80 Magnesium Alloy
Authors: Zhu Li Ping , Zhu Yu Jin , Wang Chao Lun , Lu Chuang , Fang Xiao Zu , Cao Xue Jun
Published: January 2014

The atmospheric corrosion behaviors of AZ80 magnesium alloy are investigated by exposure test in different testing sites. After four months exposure test, the corrosion morphologies and the component of the corrosion products were observed by the scanning electron microscopy (SEM) equipped with energy-dispersive analysis of X-ray (EDAX). The corrosion rates of AZ80 magnesium alloys were calculated by mass-loss. The results indicated that the corrosion resistance of AZ80 magnesium alloy in the sea environment is the worst. The corrosion degree of the back surface is worse than the front side. The corrosion products are mainly formed by carbonate, and contain small amount of chloride in most environments, while in Xishuangbanna and Jiangjin area contain a little sulfate.
Effect of Sr Addition on Microstructure and Mechanical Properties of Semi-Solid 2024 Al Alloys
Authors: Khunbanterng Nisachon , Wisutmethangoon Sirikul , Plookphol Thawatchai , Wannasin Jessada
Published: January 2014

Semi-solid 2024 Al alloys with strontium (Sr) addition of 0.15 wt% and 0.3 wt% were prepared by Gas Induced Semi-Solid (GISS) process. Effect of Sr addition on the microstructure and mechanical properties of the semi-solid 2024 alloy was investigated. It was found that the tensile strength and % elongation of the T6 heat treated alloy with the Sr addition were higher than those without Sr addition owing to the reduction of Mg2Si phase formation. The semi-solid 2024 Al alloy with 0.15%Sr addition obtained the average highest tensile strength of 382 MPa and elongation of 6.45%.
Recovery of Copper from Copper Smelter Slag by Flotation
Authors: Tong Xiong , Han Bin , Ren Shuai Peng , Yang Bo
Published: January 2014

The recovery of copper from copper smelter slag utilizing flotation has been studied. A copper smelter slag from the Wang Jiaqiao smelter in Yunnan Province of china, containing 2.76% Cu, 44.41% Fe, 2.34% Zn and 18.4g/t Ag and so on, has been used .The effective factors such as grinding fineness, pH, and the dosage and type of collector were examined. Under the ﬂotation condition of grinding fineness (90%-74μm), rougher pH 6, XT-53(80 g/t), and 2# oil (30g/t) , copper grade of 23.55 %, recovery of 85.61% was obtained. Besides, silver get a recovery of 76.2% and grade of 143.07g/t as associated metals.
Candida rugosa Lipase Adsorption on Nylon-6: Optimization, Kinetic and Thermodynamic Analysis
Authors: Liu Xue Ying , Zeng Hong Yan , He Ping , Peng Deng Hong , Gohi Bi Foua Claude Alain , Fan Bin , Yu Chao , Li Yu Qin
Published: January 2014

Candida rugosa Lipase was immobilized on the activated nylon-6 membrane using 0.5% glutaraldehyde as cross-linking agent. The immobilized lipase had an improved temperature and pH stability and exhibited good reusability. The adsorption process followed pseudo-second order rate equation and the biosorption isotherms correlated well with the Langmuir isotherm model. Negative ΔG indicated the adsorption process was spontaneous and the positive of ΔH indicated that the adsorption was endothermic.
Structural Optimization of Composite Panel with Lamination Parameters and Equivalent Stiffness Laminate Method
Authors: Zhong Xiao Ping , Jin Peng
Published: January 2014

Firstly, a two-level optimization procedure for composite structure is investigated with lamination parameters as design variables and MSC.Nastran as analysis tool. The details using lamination parameters as MSC.Nastran input parameters are presented. Secondly, with a proper equivalent stiffness laminate built to substitute for the lamination parameters, a two-level optimization method based on the equivalent stiffness laminate is proposed. Compared with the lamination parameters-based method, the layer thicknesses of the equivalent stiffness laminate are adopted as continuous design variables at the first level. The corresponding lamination parameters are calculated from the optimal layer thicknesses. At the second level, genetic algorithm (GA) is applied to identify an optimal laminate configuration to target the lamination parameters obtained. The numerical example shows that the proposed method without considering constraints of lamination parameters can obtain better optimal results.
Discussion on Finite Element Model for Three Dimensional Rolling Process Analysis
Authors: Shen Chi Chih
Published: January 2014

A three dimensional numerical simulation model of metal rolling formation is developed from the theoretical model. In this theoretical model, the two variables of element deformation and temperature variation are placed in a variable matrix. The thermal elastic plastic rigid matrix and heat transfer rigid matrix are placed in the same expansion rigid matrix. Furthermore, the numerical simulation analytical model developed in this paper was used to simulate aluminum strip rolling.
Analysis of Press-Extrusion Forming for Embossment on the Stamping Part
Authors: Lin Chong Chao , Wang Ke Sheng , Xu Ye , Zhang Li Han
Published: January 2014

Press-extrusion forming is a combined extrusion process for forming embossment on metal sheets. A series of simulations on embossment forming using the program DEFORM were carried out. It is shown that the optimal process, the suitable die structure and the friction conditions can form embossment on the stamping part with good dimensions. The experiments conducted in the present study not only validated the finite element analysis but also confirmed the efficiency of the suitable die structure in helping the embossment formation.
Research on Mechanical Properties and Appearance of Mulberry Silk Soaked with Clean Water
Authors: Huang Ji Wei , Hong Ji Wu , Huang Ling , Lin Bi Quan , Ling Xin Long , Lin Hai Tao , Jiang Fang , Yue Xin Xia
Published: January 2014

Mulberry raw silk is composed of sericin and fibroin and must be soaked before it is reeled. In this paper, the effect of soaking temperature and soaking time in clean water on mechanical properties and appearance of mulberry silk is studied. When soaking time is 40 min and soaking temperature is 55 °C, the resulting silk can satisfied with further operation.
An Improved Continuous Gas Lift Design Method with Variable Pressure Drop
Authors: Wei Luo , Liao Rui Quan , Li Yong , Feng Ren Dong
Published: January 2014

As to three kinds of continuous gas lift design methods commonly used using surface casing pressure control all have several disadvantages when the pressure drop between the valves is small, and they have some deficiency when gas injection pressure is relatively inadequate on ground or want to play the affection of the gas injection pressure on ground as much as possible, therefore, the applied study is made in this regard. First, the precise calculation method of the top valve depth under different conditions was achieved based on the principle of U type tube, then an improved variable pressure drop design method was derived based on the basic principle of gas lift unloading and by using another set of gas injection pressure system on ground independently for designing the valve depth. The obvious advantages of the improved method were found by comparing the available maximum of the gas injection depth and the production rate of the existing methods and the improved method in the same condition of gas injection on ground and on the basis of ensuring the safety design principle.
Molecular Docking Studies on the Interaction of 2-Arylpropionate Esters with Candida rugosa Lipase
Authors: Liu Xue Ying , Zeng Hong Yan , Peng Deng Hong , Gohi Bi Foua Claude Alain , Huang Qing Jun , Yu Chao , Li Yu Qin
Published: January 2014

The interaction between ethyl 2-arylpropiolates andCandida rugosalipase was studied by enantioselective hydrolysis and molecular docking. The ethyl 2-arylpropiolates with the lowest binding energy was selected to investigate the molecular mechanism of enzyme mediated asymmetric catalysis mechanism.
Rapid Detection of H2S in Heart Blood by Chemical Method and GC / MS
Authors: Xu Pian , Tao Dai Qin , Liu Wen Wen
Published: January 2014

Objective To establish and verify analytical methods of hydrogen sulfide (H2S) detection in heart blood by Chemical Method and Gas Chromatography - Mass Spectrometry (GC/MS). Method Take 3-5mL of heart blood, placed in 20mL vial, adding 3-5mL of deionized water, 1mL of 2mol/L hydrochloric acid (HCl), stamped seal, and denatured at 60 °C water bath for 30min. Both Chemical Method and GC/MS were used to assay the headspace inside vial. Results These two methods are all detected H2S in the heart blood of the poisoning death. Conclusion These two methods are rapid, simple, reliable, and of high sensitivity, reproducibility, and suitable for rapid analysis of hydrogen sulfide in forensic and criminal casework.
Design and Manufacture of a Unilateral Permanent Magnet Linear Motor for Assembly
Authors: Liu Quan , Fei Yuan
Published: January 2014

Based on the analysis of structure characteristics of unilateral permanent magnet linear motors, two key points of assembling, how to avoid the stronger magnetic attraction and ensure dimensional precision of the air gap between primary section and secondary section, were discussed. Several new methods of designmachining and assembly process were presented, assured the accuracy and stability of unilateral permanent magnet linear motors. The measuring results met the performance requirements.
The Improvement of Complex Structure of Single Cylinder Double Acting Piston Pump
Authors: Dong Chao , Zheng Wei Gang
Published: January 2014

Now the single piston reciprocating pump generally be used on the ship has many disadvantages,especially the complex structure easy to be damaged and the uneven flow etc..Aiming at the disadvantages . the single cylinder piston reciprocating pump is improved and adjustment .So that it can solve the problem of damage and the unequal flow.The running efficiency of single cylinder piston reciprocating pump has been greatly improved
Study on Hull Deformation at Supports of Propulsion Shaft of a Large Container Ship
Authors: Ruan Xiang Kui , Yang Ping , Yan Xin Ping , Huang Zhe
Published: January 2014

The aim of the paper is to evaluate the hull deformation at propulsion shaft supports of a large container ship under different loading cases and wave parameters. From the results of the study some valuable conclusions can be drawn for reasonable shafting alignment of a ship.
A New Method to Extract Substructures for the Multi-Shaft Transmission
Authors: Tong Chun , Li Hua , Yao Jin
Published: January 2014

Dynamic substructure method has been widely used in analyzing the torsional vibration characteristics of multi-shaft transmission. However, the existing literatures extract substructures of the multi-shaft transmission by treating its gears and shaft as several rotors, resulting in complex displacement coordination relationships and making it difficult to build dynamic model for the whole system. In this paper, a new method to extract substructures of the multi-shaft transmission is proposed when analyzing its torsional vibration characteristics using the dynamic substructure method. The proposed method avoids analyzing the displacement coordination relationships for the gear meshing, making it easier and more effective to establish the dynamic model for multi-shaft transmission.
Effect of Welding Procedure on Main Girder Fatigue Property
Authors: Shen Gang , Xiang Dong , Liu Nan , Mou Peng , Yang Yong , Jiang Jing Min , Li Xiao Long
Published: January 2014

Hoisting machinery is an important part of the equipment manufacturing industry, and the general bridge crane is the most widely used hoisting machinery. The main girder of bridge crane is the main load-bearing structure. Further, fatigue failure of main girder usually occurs not on the material itself but in the welding joint. The article has carried out three groups of experiments, which are experiment on fatigue property under vertical force, experiment on fatigue property under the comprehensive function of vertical force and horizontal force and experiment on failure mode of main girder under the prefabricated crack, to further discuss the effect of welding procedure on main girder fatigue property. Finally the following three conclusions are obtained. Firstly, the crack occurs closely to the middle position of welding place of the lower board and the main web, with the trend of scaling up along the main web perpendicular to the welding place. Secondly, the crack occurs on the main web close to the upper board, with the two-way expansion trend. Thirdly, fatigue failure cracks do not occur in the welding joint except the prefabricated crack position close to the square steel rail after the cyclic loading of two million times on main girder, which indicates that the uniformity of welding quality has an importance influence on the fatigue reliability of the whole main girder.
Causes of Surge of Turbocharger for Marine Diesel Engine and Measures against Surge
Authors: Liu Nan , Leng Yue
Published: January 2014

In order to avoid surge of turbocharger for marine diesel engine, extending service life of turbocharger, we find out some causes and preventive measures of surge of turbocharger for diesel engine due to our accumulation and research in practice. According to the practical test of our company, the causes of surge is accurate and the preventive measures are somewhat productive
Effects of Fuel Supply Advance Angles on Performance of Engine Fueled with Butanol Diesel
Authors: Xiao Ming Wei , Zhang Jun Han , He Jin Ge
Published: January 2014

The experiments of the fuel economy performance and emission characteristics of diesel engine fueled with butanol diesel were performed on a dual-cylinder direct injection diesel engine at different fuel supply advance angles. The results showed that whether the fuel supply advance angle is too large or too small, it will increase the fuel consumption. As the fuel supply advance angle is 20°CA, the brake specific fuel consumption is the best of the butanol diesel engine. When the supply advance angle becomes larger, the smoke and CO emissions can be reduced on the medium and high loads, but NOXemissions are significantly increased on a variety of load conditions. The engine will obtain the lowest HC emissions, as the fuel supply advance angle is 20°CA.
Study on Dynamical Simulation of Swing Movable Teeth Reducer
Authors: Wang Yan Fang , Yang Bo
Published: January 2014

Swing movable teeth reducer is a new type of small teeth difference planetary gear transmission. As a new product development technology, virtual prototype technology is a digital design method based on the product simulation model. It is important to carry on the performance simulation of the reducer and seek the optimization design of the products on virtual prototype technology. Based on the study on the principle and structure of the swing movable teeth transmission, it analyzed the motion of the system, carried on the dynamical simulation of the swing movable teeth reducer, which is established on the virtual prototype. At the same time, the paper analyzed the dynamical simulation on the rotational speed and force of the mainly parts.
Influence of Composition and Heat Process to Performance of End Forging with Flange
Authors: Shi Rong Gang , Wang Zhan Yong , Yan Xiu Ping , Li Juan
Published: January 2014

By adjusting the chemical composition, optimizing the heat process and using special quenching equipment, a extra-thick complicated end forging with flange is made. The result shows that the extra-thick complicated end forging obtains homogeneous mechanical property.
The Kinematics Modeling and Simulation of a Mechanical Arm in Nuclear Industry with Postpositional Drive
Authors: Zhao Rui Feng , Zhang Zhen , Cui Jiu Qiang
Published: January 2014

For the particularity of the environment in nuclear industry, this paper puts forward a modularized mechanical arm with postpositional drive. On the basis of structural characteristics and kinematic constraints, the kinematics of robotic arm is analyzed. The D-H method is used for describing the workspace, based on considering the kinematic constraints, the forward kinematics model is achieved. Using an improved search method, the inverse kinematics solution is obtained. Through the simulation on data processing software, the validity of positive kinematics model and inverse kinematic solutions are verified. Finally, the trajectory planning is completed on the three-dimensional modeling platform.
Hemispherical Parts Numerical Simulation of Deep Drawing
Authors: Su Bing Ling
Published: January 2014

Axisymmetrical hemispherical pieces belong, in considering plate thickness variation of normal anisotropy, hardening and friction, BHF on the basis of various factors such as the establishment of the different stages of the forming process of the mechanical model of the deformation zone is derived the calculation equation, the preparation process, the process for drawing the stress-strain state and the shape of the part thickness distribution for a complete numerical analysis.
The Key Technologies in Designing of a Special Machine for Heat Exchanger Tube Bundle Drawing and Assembling
Authors: Yang Ke , Guan Shang Jun , Jia Jian Bo , Wu Chang Zhong
Published: January 2014

The Key Technologies in Designing of a special machine for heat exchanger tube bundle drawing and assembling were discussed. Heat exchanger tube bundle drawing and assembling machine is a special equipment for maintenance of heat exchanger of petroleum, chemical and other enterprises,specifically for removal and installation of the heat exchanger tube bundle .This paper introduces a self-developed heat exchanger tube bundle drawing and assembling machine’s overall structure, driving principle, hydraulic system and electrical control system’s design. The bundle drawing and assembling machine has large force, drawing and assembling are stable, safe and high efficiency and low cost and so on advantages, it has been put into mass production and gets a good evaluation.