bluuebunny/crossref_metadata_2025 huggingface dataset:
Distortion Analysis on Reflector Antenna Surface Using Non-Probabilistic Interval Method
Authors: Ma Hong Bo , Xu Xiao Feng
Published: August 2011

This paper studies the analysis technique for complex antenna structures considering non-probabilistic uncertainty parameters. A method, which combines the interval matrix perturbation algorithm with the interval truncation algorithm, is proposed to analyze the distorted interval information for complex structures. Through the analysis of relative uncertainty of interval parameters, the criterion to determine the interval truncation factor is obtained. Two numerical examples, including a truss structure and a complex reflector antenna structure, show that the method is rational and feasible.
Rigid-Flexible Coupled Modeling and Simulation Analysis of Printing Cylinder Based on ANSYS
Authors: Guo Jun Zhong , Yang Jun Ping , Cai Tian Tian
Published: August 2011

In order to analyze the influence on the printing graphics from the deformation of the printing cylinders and blankets, in this paper, offset printing unit was as the research object, the three-dimensional assembly model of printing cylinders was established by using SolidWorks , the model was imported into finite element software ANSYS, by using ANSYS nonlinear contact calculated functionality, the face-to-face contact of impression surface between plate cylinder and blanket cylinder, blanket cylinder and impression cylinder were established, the stress and strain distribution of blanket were obtained, and the elongation value of circumferential and radial direction of blanket were got, the dot enlargement value was received by simulation analysis.
Forming Limit Diagram of Magnesium Alloy ZK60 at Elevated Temperature
Authors: Liu Hong Wei , Yao Sheng Jie , Liu Wen Liang , Zhang Zhao Duo
Published: August 2011

The forming limit diagram of magnesium alloy ZK60 was developed with Hill’s instability criterion and M-K analysis. The relationship of forming limit with stain path, temperature and the thickness irregular coefficient were analyzed. The results show that the forming limit of ZK60 magnesium alloy increased little with the rising of strain ratio, but influenced greatly by the failure definition , and forming limit of is increased with the rising of temperature and thickness irregular coefficient, the most suitable value of f0 is 0.99, the fracture occur on the grain boundaries with significant cavities formation.
A Topology Optimization Approach and its Application in the Design of a Key Connecting Component of a Harvester
Authors: Chen Xiang , Liu Xin Jun
Published: August 2011

This paper focuses on an approach to topology optimization and its engineering application. Based on SIMP (Solid Isotropic Microstructure with Penalization) method combined with Guide-Weight method, an approach to solve topology optimization problems is proposed. Then the topology optimization is applied in the design of a key connecting component in a sorghum harvester by the use of proposed method. The derivation process of the iteration formulations demonstrates that the proposed approach has the advantages of easiness to derive and good universality. The result is satisfactory and the convergence speed is fast enough for engineering application.
An Improved Design Based on Smart Film for Monitoring Crack Width of Concrete Bridges
Authors: Li Xing Xing , Zhang Ben Niu , Zhou Zhi Xiang , Tang Lian
Published: August 2011

Structural health monitoring is a promising way for evaluating the integrity and safety of large-scale bridges, and crack monitoring is thought to be a challenging problem in this field. An improved design based on smart film for monitoring crack width of concrete bridges is proposed in this paper. Experiments are also implemented to verify the effectiveness of this design.
Optimization Design of Self-Balacing Torsion Bar Diameter
Authors: Huang Zhi Qi
Published: August 2011

The thesis builds the optimization model for the self-balacing torsion bar, On the basis of the Ant Colony Algorithm, designs the Ant Colony Algorithm procedure using C Language and optimizes torsion bar diameter. Results show the Ant Colony Algorithm is feasible and provides a new method choosing torsion bar diameter. The max difference value is 1.12% between optimizing results and theoretical results.
Optimizing to Memory Application in Embedded Multimedia Device
Authors: Wang Xiao Sheng , Yu Qian
Published: August 2011

The modern embedded multimedia electronic devices rely on dynamically-allocated data structures to store and process their data, as a result, the demand of its memory capacity and dynamic are increasing unceasingly. In order to better solve the memory application optimization in embedded device, this paper represents multimedia application’s dynamic data structures optimization flow and improved or modified NSGA-II multi-objective evolutionary algorithm (MNSGA-II), and uses three objective functions: embedded device’s memory accesses, memory use and energy consumption. The MNSGA-II algorithm adopts repeat crowded distance sorting tactics to improve NSGA-II based on keeping the advantage of the original NSGA-II for multi-objective optimization problem. The experiment results show that MNSGA-II has better performance of the convergence and the diversity of solutions than original NSGA-II, and the optimal dynamic data structure implementation is successful by performing our method for one real embedded multimedia device’s memory application.
Min-Max Partition Method of Product Modularization Based on Fuzzy Clustering
Authors: Chen Yan Hui , Zhou De Jian
Published: August 2011

This paper presents a new method of product module partition based on the fuzzy clustering analysis. This method demonstrates the relevant definitions and calculation methods of the initial partition, min-max partition, submodule relevancy and module aggregation etc., and establishes the incidence matrix to respectively carry out the initial partition for the products and calculation of min-max partition according to various incidence relations between parts and components. Taking the submodule as computing unit in each module set, this paper carries out the fuzzy cluster analysis to obtain the module partition results of the products, and finally demonstrates the rationality and effectiveness of this method by taking the example of the working units of the wheel loaders.
Displacement of Elevator Boom Interference and Suppression on Rated Capacity
Authors: Lin Gui Yu , Li Wei Tao , Chang Da Shuai
Published: August 2011

According to the effective of the displacement of crane boom to rated capacity, establishing a mechanical model with a prototype. After calculation and analysis, take drastic measures to ensure the rated lifting capacity. And the measures are worth popularizing.
Application of Optimization Algorithms in Injection Molding Process Parameters
Authors: Hu Ze Hao , Wei Wei , Liu Juan , Liu Kun
Published: August 2011

The data of process parameters and quality index from CAE simulation orthogonal test is used as training samples, the BP neural network is trained and the neural networks ensemble approximate calculation agent model of the relations between processing parameters and the quality index of product are obtained. The agent model with a clear mathematical formula calculates quickly and accurately, so it can optimize globally by the genetic algorithm. The best group of process parameters is obtained and a multi-objective optimization of the quality index of products is realized.
Research on Dynamic Characteristic of Planetary Gear Train by Visualization Technology
Authors: You Xiao Mei , Meng Lei , Ma Xing Guo , Wen Bang Chun
Published: August 2011

Based on the multi-body dynamics theory and visualization technology, a planetary gear train system is studied in RecurDyn. The multi-body dynamics model of the 2K-H planetary gear train system is built to do the visual analysis on dynamic characteristic of the planetary gear system severally in the ideal steady-state condition and the random-load condition, than the real-time dynamic contact stress and some other meaningful results of the key components are gained. Compared the related simulation results with that of the theoretical analysis, it is known that two kinds of results are consistent and the simulation analysis on the planetary gear train system is correct and accuracy. From the research above, the new idea and analytical tool are provided for the traditional, static, "redundancy" design method of the gear system, and also the effective technical mean is provided in conceptual design of complex mechanical products to predict the performance, then to reduce the "birth defects" in design stage and also an effective and efficient technical means for engineering applications is offered for optimal design and developing new product on gear train system.
Numerical Simulation Method for 3D Low Speed Micro Flapping-Wing with Complex Kinematics
Authors: Yang Wen Qing , Song Bi Feng , Song Wen Ping , Li Zhan Ke , Zhang Ya Feng
Published: August 2011

A numerical simulation method is presented in this paper for 3D low speed micro flapping-wing with complex kinematics. The main characteristics for the numerical simulation of Flapping-wing Micro Air Vehicle (FMAV) include: low speed, big range of wing motion, and complex kinematics. The low speed problem is solved by preconditioning method. The big range of wing motion problem is solved by chimera grid system. The problem of complex kinematics is solved by decomposed into three main motions, i.e. plunging, pitching, and swing respectively. The numerical method is solving the Reynolds Averaged Navier-Stokes equations for the viscous flow over micro flapping-wing. The numerical method of this paper is validated by good accordance with experimental results of reference. This method can used to simulate the aerodynamic performance of micro flapping-wing with complex kinematics in low speed and is helpful to the FMAV designers as a design tool.
3D Coordinate Measurement System Using Single Camera and IMU
Authors: Shah Syed Ghafoor , Xu Gui Li , Ni Wei Ji , Ye Yong Qiang
Published: August 2011

This paper proposes a new method for measuring 3D coordinates of a point using a single camera vision system. The contact point is determined by using 3D force sensors. In addition, the force limiting system has also been incorporated to improve accuracy of the results. 3D point is captured when the touching probe senses the force up to certain limit and subsequently recording of that point is initiated. The points being recorded are then processed for the required feature calculation such as distance between planes, angle, radius etc. The IMU (inertial measurement unit) initially estimates the target plane position which enables the whole system to perform the required task quickly. Hence, this system can be used for continuous scanning of any surface.
Application Research on TRIZ Physical Contradiction Solving Principles in Armored Vehicles
Authors: Cui Yu Lian , Wu Wei , Tang Dong Hong
Published: August 2011

TRIZ theory is a new method of creative design which provides systematic theory and tools for inventive problem discovering and solving. In this paper, physical contradiction solving principles is discussed and its application in armored vehicles is also presented to illustrate its significant value in engineering practical problem solving.
Research on Extended Design Platform Recognition Method
Authors: He Ji Li
Published: August 2011

Nowadays a general platform has played an important role in the product design process. As the traditional similarity measure used in module division is to the design stage in which the features and set are static, it is impossible to find the similar components in alterative design stages. For this reason, a new common platform design method on extension-distance is presented. According to build the relative function, the threshold used in the key module recognition is easy to generate. Then the tolerance-constraint function in the customized components division for the common platform generation. Then the adaptability measure is used to find the optimal case in the database. The measure has been used in the gasoline saw common platform design process.
Noncontact Angle Measuring System Based on Laser and Capacitive Sensor
Authors: Feng Yu Jun , Xiong Zheng Ye , Li Yong Qiang , Huang Cun You , Shi Wen Qing , Chen Jing Min
Published: August 2011

Based on laser and capacitive sensor, a method of measuring deflectable angle is presented, and a noncontact angle measuring system is established. This system has the advantages of simple constitution, real-time, on-line measuring, non-contact and high precision. It can be widely used in engineering, especially in blade angle detection of knife and scissors.
Research of the Optimal Propulsion System for a Polar Scientific Icebreaker
Authors: Yang Yong , Zhang Gui Chen , Tang Wen Yong , Che Chi Dong , Ma Jie
Published: August 2011

It’s very impending for our country and scientists to build a new polar scientific icebreaker in order to take the place of the scientific icebreaker “Snow Dragon”, which is not suitable for more and more scientific researches in the polar areas in future, because many latest technologies and equipments, which improve icebreaker performances and research abilities, have appeared in recent years. To ensure icebreakers break ice and sail normally in atrocious polar environment, propulsion systems must be analyzed and designed particularly. According to the relative classification rules, many propulsion systems for a new polar scientific icebreaker are analyzed and compared with each other carefully in the process of project designs. And with a view to the vessel specification and work assignments in the polar areas, Azipod units are selected as the optimal propulsion systems for the icebreaker at last.
An Advanced FEA Based Analytical Strategy for the Milling of Overall Thin-Walled Workpieces
Authors: Ji Wei , Qin Guo Hua , Ye Hai Chao
Published: August 2011

A multi-level finite element analysis approach is introduced to investigate force-induced deformations in milling of overall thin-walled structures. This prediction algorithm takes into account the deformation of the workpiece in different points of the tool path. The machining conditions are modified at each analysis step when the cutting force and deformation achieve a local equilibrium. The effects of feed rates on the workpiece form deformation can be predicted using a theoretical workpiece model. In addition, this methodology can be used to compensate the machining error taking into account the predicted workpiece deformations.
A Novel Complete Analytic Way to Fixed Machined Joint
Authors: Tian Hong Liang
Published: August 2011

A concept of virtual material was suggested when the flexible joint could be considered as a virtual material with the same cross area. The virtual material is rigidly connected with 2 components situated in two sides of flexible joint. Introducing an element, a complex assembled part including a joint may be equaled as a simple component without any joint in order to simplify the complicated problem about flexible joint. The interaction between normal and tangential characteristics of fixed joint taken into account, a lot of closed-form analytic solutions of elastic modulus, shear modulus, Poisson ratio and density were deduced from virtual material through Hertz contact theory and fractal theory.
A Method on the Decision of Tolerance Grade Based on Cost and Lifetime
Authors: Li Wei Qi , Hong Jun , Li Yun Long , Zhang Yi , Li Zong Bin
Published: August 2011

Product tolerance is one of the important factors which affect the quality and cost of product. However, influenced by many complicated factors, there are still many problems which need to be resolved compared with other research works in CAD field. How to determine tolerances of product effectively is still a big problem. Based on exponent model of tolerance-cost, the relationships between tolerance and other characteristics influencing processing cost are studied in this paper. A relational model of tolerance-cost is come up with based on the above relationships. And then, internal relation between tolerance and lifetime is discussed. Meanwhile, along with the lifetime converted into the cost, the compensated relational model of tolerance-lifetime is presented. Finally, the method on the decision of tolerance grade is analyzed. This paper realizes the organic combination of tolerance, lifetime and cost, and effectively decides how to generate tolerance grades.
Study on a Large Opening in a Pressure Vessel
Authors: Wang Wei , Shi Jing Bao , Luo Ming Fu , Wang Yu Fang
Published: August 2011

In this paper ,we ared study on the reinforcement of a large opening with which the opening ratio is (W)0.8 with numerical calculation. We analyzed the Mechanical characteristics of opened shell It shows the stress concentration is seen clearly on point A which is between Connecting Inside surface of pipe and shell ,and point B, which is between Connecting outside surface of pipe and shell. And the stress concentration on point A is more than on point A when the opening ration(W) is 0.8.And it is calculated reinforcing effect and analyze the limitation when the opening ration by pressure area method（Referred to PAM）.It is obtained the limitation of PAM by comparing numerical calculation to PAM.
Synthesis and Properties of Novel Asymmetrical Porphyrin with [p-(4-Flourobenzoyloxy)-M-Ethyloxy]phenyl and its Lanthanide Complexes
Authors: Cui Xiao Ling , Shi Xin Ming , Li Shi You
Published: August 2011

A series of lanthanide complexes with acetylacetonate and a new asymmetrical 5-[p-(4-fluorobenzoyloxy)-m-ethyloxy]phenyl-10,15,20-triphenylporphyrin were prepared and characterized by elemental analyses, molar conductance, UV-Vis, IR, 1H NMR, luminescence spectra and themal analysis. Quantum yields of Q band fluorescence are in the region 0.073-0.097 at room temperature. Complexes have higher stability (decompose until 211°C). The structure that both the porphyrin behaved as a tetradentate ligand and acetylacetonate as a bidentate ligand are coordinated to a rare earth ion also has been proposed.
Research on the Face Finder and Behavior Decoding Technology in Synchronous Modeling
Authors: Liu De Fang , Tao Jie , Wang Bin , Wang Jin
Published: August 2011

This paper studied on the key technology of synchronous modeling- face finder and geometry index and flexible and rigid solve on platform of NX 6 and windows. This technology supports modeling by identify a range of input faces and geometric conditions of a group faces to search, find and choose faces by face finder, and solving surface-related acts of movement at the same time. While the technology was theoretical analyzed, the practical examples was also employed to testify the efficiency of the technology. Parametric or non-parametric 3D models were modified by the operation of face moving, face copying or face choosing, and face transforming to revise the position relationship among faces. Thus the topology structure of the model is altered, and product model design and modification work is completed efficiently.
Optimization on the Bottleneck Process of 63PF2 Conveying Chain Assembly
Authors: Meng Ai Ying
Published: August 2011

Aiming at the problem of more difficult and low efficiency to assembly 63PF2 conveying chain, the work measurement, action research and production line balancing method are studied, and the data of 63PF2 conveying chain assembly lines is obtained. Taking 63PF2 conveying chain assembly lines for example and using industrial engineering foundation of stopwatch time study, two-handed operation analysis, process flow analysis and quality management of fishbone diagram, the problems existing in 63PF2 conveying chain assembly process are analyzed. And then the work site preliminary optimization is carried out. The bottleneck process of assembly process is optimized and improved. And the balance of assembly line is optimized, so as to improve the transmission chain assembly efficiency.
Properties of PE-Coating Steel Pipes Used for Water Supply in Severely Cold and Salty Regions
Authors: Liao Dong Mei , Chen Yan Ming , Jiang Jin , Zou Pin Guo , Zhao Xun
Published: August 2011

Recently, polyethylene coating steel pipe has been extensively applied to water delivery in south-east China. However, similar applications in the north-west district where is severely cold and salty are seldom reported. This paper designed the refrigeration experiment, the freeze-thaw cycle experiment and the chemical immersion experiment after freeze-thaw, to test the PE coating steel pipe's reliability in the severely cold and salty region. The result showed that, after freeze-thaw or a period of refrigeration, a small number of dark spots appeared in the coating but didn’t change with the increase of freeze-thaw cycle times and the erosion of salt. The compositions were proved to be carbon and oxygen which indicated that the spots might be relative to the cryogenic stability of the coating rather than the corrosion of matrix steel. A crack and corrosion spot also appeared in test due to the excessively thick coating and the burr in steel substrate which can be eliminated by manufacturers through improving the coating formulas, surface pretreatment and coating process.
Preparation of High Oil-Absorbing Materials by Using Modified Microcrystalline Cellulose
Authors: Tan Feng Zhi , Cao Ya Feng , Wang Da Zhi
Published: August 2011

Abstract. In this paper, high oil-absorbing resin is prepared, using microcrystalline cellulose as base material, and acrylate as grafting monomer. Effect of mass ratio of microcrystalline cellulose/monomer, the amount of cross-linking agent, initiator dosage, reaction temperature, and reaction time on oil-absorbing properties of the products is investigated. The optimized conditions are as followed: reaction time 6 hours, reaction temperature 70 °C, mass ratio of microcrystalline cellulose to monomer 1:1.5. The oil absorbing ratio of the product prepared under these conditions is up to 12.9 g/g for toluene, and 14.6 g/g for kerosene oil.
Application of Automobile Lightweight Alloys and the Development of its Die-Casting Technology
Authors: Liu De Fang , Tao Jie
Published: August 2011

With the development of lightweight vehicles, lightweight alloy materials has been increasingly used in automotive industry, automobile manufacturers are therefore looking for thinner and stronger materials so that the higher requirements has became a challenge to lightweight alloy die-casting technology. The paper summarized the applications of lightweight alloys in the automotive industry, and the new advances of lightweight alloys die-casting technology, such as low pressure die-casting, semi-solid die casting, oxygenation die-casting and the combination of different die-casting technologies, and discussed the development trend of the lightweight alloy die-casting technology.
A Feature-Based Process Planning Approach for Fineblanking-Forming-Stamping Parts
Authors: Wang Yi Lin , Long Hui Cai
Published: August 2011

A feature-based process planning approach for fineblanking-forming-stamping parts is discussed in this paper. To reduce the dependence of experience designers and improve the design efficiency and quality, a prototype of feature-based process planning system has been established. The system consists of four major modules: forming process recognition, feature representation, operation sequence design and parametric feature modeling. The graph-based process recognition and feature representation methods are introduced. The knowledge-based methods are also used for process planning. An application example is illustrated.
Preparation and Properties of Nanocomposites Consist of Carbon Black N220 and Epoxy Resin
Authors: Jiao Jian , Liu Pan Bo , Zou Liang , Wu Guang Li
Published: August 2011

The nanometer carbon black (CB) N220 of different content was employed to prepare carbon black N220/epoxy resin (CB N220/EP) composites by filling-mixing method. The structure of CB N220 and its dispersion in epoxy resin were analyzed by TEM and tensile fracture surface of the composites was analyzed by SEM. Experimental results showed that CB N220 was dispersed in epoxy resin homogenously in the form of CB particles and it formed a good interface with epoxy resin in the presence of coupling agent (KH-550). Using of CB N220 enhanced the mechanical and thermal properties of the composites, for tensile strength, elongation at break, impact strength and ﬂexural strength of the composites ﬁlled with 2 wt% CB N220 reached a maximum values( 82Mpa、3％、20 KJ•m-2、107Mpa), a rise of 32.3％、39.6％、88.7％、10.3％, respectively, compared to pristine epoxy resin.
A Novel Air Cushion Press Nanoimprint Lithography
Authors: Duan Zhi Yong , Gong Qiao Xia , Zhang Hui Min , Liang Er Jun
Published: August 2011

nanoimprint was developed quickly in decades because of its ultrahigh resolution, low cost, high throughput. It has demonstrated the ability to pattern 5 nm line-width and 12 inch wafer, and is one of the support technology in NGL. This paper reported a novel nanoimprint to improve the pressure uniformity with air cushion press. The chamber is sealed by a SiO2 window with an elastic ring membrane, on which the mold is fixed . Ultraviolet light solidify resist on the wafer through this window. When air in chamber bleeded the window falled and the mold is pressed into the resist. If air leading into the chamber again, the mold separate from substrate by the elastic ring membrane, then the patterns on mold are translated onto the substrate. Experiments exhibit that this nanoimprint system can replicate features with high fidelity over a large patterning area.
Analytical Analysis of Three-Roll Bending of Thin-Plate
Authors: Cai Zhong Yi , Lan Ying Wu , Li Ming Zhe
Published: August 2011

In this paper, an analytical solution for the three-roll bending process of thin-plate was presented. Based on the theoretical analysis on continuously loading and unloading deformation of the plate during roll-bending, the curvature equations governing the bending behavior of thin-plate were set up and then solved by integration. Combing the solutions with the geometrical relationships in three-roll bender, the deflection and bending angles occurring during the steady continuous bending period were obtained by an iterative scheme. Numerical examples were given to illustrate the application of the solutions. The variation of the top roll’s position with the intended bend radius, the curvature and deflection distributions on bent plate were shown in graphically and discussed.
Design of a Novel Multifunctional Rehabilitation Aid Based on Ergonomics
Authors: Zhang Jian Guo , Liu He Rong
Published: August 2011

A novel aid with self-care and rehabilitation function has been designed based on ergonomics, according to the functional demand of ADL (Activities of Daily Living) and the requirements of rehabilitation training for disabled people or elderly. The overall design process and the main functions of the aid were introduced in this paper. Its concept design and motion simulation is finished by using Pro/E software. The aid can meet the ADL demand of the disabled people and elderly such as getting up, going to the toilet etc.
Steel-Bonded Cemented Carbide Cladding Prepared by Technological Combination of Powder Explosive Compaction and Liquid Sintering
Authors: Gao Zhi Guo , Wang Hua , Feng Yan Qing , Zhao Yi Sheng
Published: August 2011

Steel-bonded cemented carbide sheet considered as cladding was successfully bonded with carbon steel plate by a technological combination of powder explosive compaction and liquid sintering. The microstructural interface between steel-bonded cemented carbide cladding and carbon steel plate was characterized by SEM, EDS analysis and hardness testing. The results showed that the gradient distributions of the elements Fe, C and W were found in the normal direction of the interface. The element W permeated about 100μm in depth through the side of carbon steel. The improved hardness of about 600～700HV of cladding was attributed to multiple carbides.
Design of the Centralized Power Management Based on the MOST Networks
Authors: Jin Yu Shan , He Xing Ran , Liu Rui Kai , Huang Yong Ping
Published: August 2011

MOST bus protocol is a high speed multimedia transmission protocol which applies to the in-vehicle entertainment system to solve wiring difficulty, EMI and so on. However, with the increasing number and complexity of the in-vehicle entertainment devices, the energy consumption of system grows continuously. In the paper, a kind of the centralized power management based on the MOST networks is designed. The PowerMaster function in the MOST Master node can control and change the status of every device node by monitoring the running situation of the whole MOST networks. At last, the experiment indicates that the PowerMaster can manage the power supply of the MOST networks effectively. Under the control of the PowerMaster, the system energy cost is lower than before.
Preparation and Properties of Rigid Cross-Linked PVC Foam
Authors: Shi Ai Hua , Zhang Guang Cheng , Pan Heng Tai , Ma Zhong Lei , Zhao Chen Hui
Published: August 2011

High performance rigid cross-linked PVC foam has been prepared by molding process and boiling foam process with the main materials including polyvinyl chloride paste resin (PVC), liquefied methylene bis-phenyl diisocyanate (MDI-L) and methylhexahydrophthalic anhydride (MHHPA). The chemical structure, cellular structure and thermal properties were respectively characterized by fourier transform infrared spectrometer (FTIR), scanning electron microscopy (SEM), thermomechanical analyzer (TMA) and thermogravimetric analyzer (TGA). Results showed that the foam had a uniform cellular structure, and cell size was about 760μm. The glass transition temperature (Tg) was 81°C and 5% weight loss temperature (T5d) was 252°C.
Effect of Temperature and Frequency on Dynamic Mechanical Properties of Poly(Methyl Methacrylate)
Authors: Zhao Rong Guo , Li Hong Chao , Chen Chao Zhong , Luo Xi Yan , Li Xiu Juan , Tan Dun Hou , Li Jun Fei
Published: August 2011

The temperature sweep tests at defferent frequencies and heating rates, and frequency sweep tests at various temperatures for the samples of poly(methyl methacrylate) are carried out on a dynamic mechanical thermal spectrometer EPLEXOR® 500N-Gabo. The effects of temperature, frequency and heating rate on dynamic mechanical properties of poly(methyl methacrylate) are investigated. The results indicate that the glass transition temperature of poly(methyl methacrylate) increases with increasing frequency from 1 to 100Hz, and increases with increasing heating rate from 3 to 8°C/min as well. The temperature sweep curves at various heating rates suggest that the storage modulus of poly(methyl methacrylate) is non-sensitive at heating rate 3°C/min or 8°C/min, while heating rate is 5°C/min, there exists a critical temperature, within which the storage modulus versus temperature curves depart from each other, and beyond which the curves overlap one another. The glass transition temperature determined by the peak of loss modulus curve is smaller than that defined by the peak of loss tangent. The frequency sweep curves at a constant temperature show that a drop in storage modulus and a peak in loss tangent appear at a certain critical frequency, and the critical frequency increases with increasing temperature. For amorphous polymer, a competitive mechanism between frequency and temperature is observed. Higher temperature accelerates molecular motion, while higher frequency restrains molecular motion, so that the critical frequency corresponding to the peak of loss tangent shifts toward the direction of high temperature.
Design of Floating HPMC Matrix Tablets: Effect of Formulation Variables on Floating Properties and Drug Release
Authors: Sungthongjeen Srisagul , Sriamornsak Pornsak , Puttipipatkhachorn Satit
Published: August 2011

Floating matrix tablets were designed and evaluated. Theophylline was used as a model drug. The system was prepared by mixing drug, matrix-forming polymer (hydroxypropyl methylcellulose, HPMC) and fillers together. The blended powder was compressed by hydraulic press. The effect of formulation variables such as type of matrix forming polymer (HPMC K100LV, HPMC K4M, HPMC K100M), amount of effervescent agent (0, 20, 30, 40% w/w) and compression force (0.5, 1 ton) on floating properties and drug release of floating matrix tablets were investigated. The results demonstrated that type of polymer affected floating properties of the floating matrix tablets. The floating matrix tablets prepared from lower viscosity HPMC (HPMC K100LV) showed faster drug release than those prepared from higher viscosity HPMC (HPMC K4M, HPMC K100M). Increasing amount of effervescent agent decreased time to float and increased drug release from the floating matrix tablets. Higher compression force did not affect time to float but decreased drug release from the floating matrix tablets. According to these results, floating properties and drug release of the floating matrix tablets could be modified by formulation variables. Some floating tablet formulations developed in this study showed good floating properties (time to float less than 15 minutes, floating time more than 8 hours) with sustained release as required. The system is promising as a carrier for gastroretentive drug delivery systems.
Development and Application of High-Valued Wood Products Made of Fast-Growing Poplar
Authors: Xu Wei , Wu Zhi Hui , Zou Yuan Yuan
Published: August 2011

In recent years, wood of greatly value are decreasing continuously. However, the percentage of low-grade wood or fast-growing species are increasing. The utilization of fast-growing species is one of the significant themes of investigation in wood industry. Fast-growing poplar (southern type poplar) which have been planted successfully and grown over a wide area in China are well known as famous fast-growing species of the most important commercial trees and industrial timber. In this paper, the distributions of plantation resources and methods of industrial utilization of fast-growing poplar in China were analyzed, respectively. High-valued wood products made of fast-growing poplar will be an inevitable trend in wood industry, including wood-based panel, engineered wood, solid wood door, curved laminated veneer lumber, and wood floor, in the 21st century. In this paper, varieties of poplar products inclued poplar composites board, poplar floor, poplar technological door, curved laminated veneer poplar molding components and poplar scientific wood were introduced. On the basis of research and application, the author emphatically analyzed multi-layer wood floorings made of fast-growing poplar veneer and MDF, curved furniture components made of poplar veneer, sofa frame maed from poplar composites board.
The Design of Electroporation Device Based on Dielectrophoresis with its Application on the Control of Monoplast
Authors: Zhe Wang , Xian Qin , Fan Jiao Rong
Published: August 2011

μTAS is aimed at applying the operation of biochemical analysis on microchips, and its advantages have drawn great attention. This paper demonstrates a different approach to realize the capture of single cells [1]. By exerting electrode on the bottom or the top of fluid piping, it can produce the non-uniform electric field required by dielectrophoresis device. As for the application, it mainly lies in three aspects: electroporation of monoplast, dynamic fostering of monoplast array, and cell graphical techniques [2].
Synthesis, Characterization and Performance of Ce0.8La0.2O1.9-ATP Composite Catalyst for Phenol Catalytic Oxidation
Authors: Zhao Xiao Bing , You Jing , Jin Chao , Li Xia Zhang , Chen Zhi Gang
Published: August 2011

Ce0.8La0.2O1.9-attapulgite (Ce0.8La0.2O1.9-ATP) nanocomposite materials were synthesized by co-precipitation method. The microstructure and phase composition of the as-prepared samples were characterized by X-ray diffraction (XRD), Laser Raman spectroscopy (LRS), energy-dispersive spectrometer (EDS) and transmission electron microscopy (TEM). The redox properties of samples were investigated by phenol oxidation experiment. The results indicated that La3+ ions incorporated into CeO2 lattice and formed solid solution. The Ce0.8La0.2O1.9 particles with average size of about 10 nm were loaded onto the ATP and were widely dispersed. The catalytic activity was improved when La3+ was introduced. The catalytic property of Ce0.8La0.2O1.9-ATP nanocomposites for phenol was better than that of CeO2 and CeO2-ATP.
Study on the Coexistence of Porous Ecological Concrete with Plants
Authors: Quan Hong Zhu
Published: August 2011

The effects of mix proportions on the properties of porous ecological concrete, and its coexistence with plants are discussed in this paper. In conclusion, the strength of porous ecological concrete is governed simultaneously by water cement ratio and cement content. Permeability is increased with any increment in aggregate gradation and any decrease in cement paste content. The thicknesses of concrete blocks and topsoil affect the growth of plants.
Study on the Adsorption of Copper Ions by Bentonite
Authors: Cao Chun Yan , Zhao Yong Hua , Zhou Yan Jun
Published: August 2011

Bentonite was used as an adsorbent for removing copper ions from aqueous solutions，and the kinetic experiments and isothermal were performed. The results showed that the bentonite on Cu2+adsorption followed the pseudo-secondary kinetic model, the high temperature was benefit for adsorption; The isothermal experimental data were fitted using Freundlich and Langmuir adsorption isotherm.
Impact of Sterilization Methods on the Stability of Silk Fibroin Solution
Authors: Wu Xi Long , Mao Li , Qin Da Ke , Lu Shen Zhou
Published: August 2011

Different sterilization techniques such as Co(60) gamma irradiation and autoclaving were used to treat the regenerated Bombyx mori silk fibroin (RSF) in aqueous solutions. The effect of the two above mentioned sterilization methods on the conformational changes and gelation rate of RSF was studied. According to the analysis of circular dichroism spectroscopy, gamma irradiation may initiate the conformational transition from random coil to β-sheet for RSF, while autoclaving shows less significant influence on the structure changes of RSF in aqueous solutions. The results also indicate that gelation time decreased to 5 days after γ-irradiation treatment while gelation time increased to 31 days after autoclave treatment. Moreover, particles of RSF in solutions changed larger and gelation time increased when autoclaving treatment time extended. However, no detectable changes of RSF secondary structure were found investigated by XRD and FTIR. Which indicated that under both sterilization methods, the RSF structure was transformed from random coil to β-sheet structure after gelation.
A Study on Tensile Properties of NiCoCrAl/YSZ Multiscalar Microlaminate
Authors: Shi Guo Dong , Liu Min Cong , Jin Sheng
Published: August 2011

One multiscalar microlaminate (MSML) with 5 thick layers of NiCoCrAl whose thickness were different interspersed with 66 thin layer stacks of NiCoCrAl/YSZ was fabricated by EB-PVD. Uniaxial tensile testing was performed and fracture was examined using SEM. The results show that the microlaminate exhibits brittle-like behavior without macroscopic plastic deformation in room temperature tensile tests and the maximum engineering stress is 212MPa. Examination of fracture surfaces from the samples reveals that ceramic layers fail by intergranular brittle fracture between columns, but metal layers display features of both ductile and brittle fracture. It is also found that the thicknesses of metal layers have a great effect on their failure modes. And interfacial debonding and bridging metal layers are observed. Moreover, the resistance of crack propagation in the microlaminate is discussed.
Effect of Isothermal Holding Parameters on the Solid Particles Evolution of Semisolid AZ91D Alloy Produced by SIMA
Authors: Zhang Qian Qian , Cao Zhan Yi
Published: August 2011

The paper researched the isothermal time and temperature affects the solid particles evolution of semisolid AZ91D alloy, and the alloy be produced by the method of strain induced melt activation (SIMA) ,and the method of compression ratio is 40%. The research demonstrated that the solid fraction decreased and solid particle size increased when increasing temperature and time. The isothermal coarsening of solid particles obeys Ostwald ripening which depending on the curvature of the interface, thus creating concentration gradients and the diffusion transport of material. As a result, the large particles coarsening and little particles minish even dissolved and creating change of distribution frequency of solid particle size. The fitting curves reveal that the experimental data are well fitted to the coarsening equation. The quantitative analysis of solid fraction and solid particle size demonstrated that the appropriate isothermal holding temperature is 550°C -590°C and corresponding isothermal holding time is (45-60min)-(6-20min) in 40% compression ratio.
Aging Behavior of Cu-Cr-Zr-Y Alloy
Authors: Liu Yong , Wang De Jun , Tian Bao Hong
Published: August 2011

The aging behavior of Cu-0.39Cr-0.11Zr-0.12Y alloy was investigated in this paper. The results showed that the tested alloy could obtain higher electrical conductivity and microhardness in solution at 960 °C for 1 hour under various deformations and aging at 480 °C condition than that of the alloy in solution-aged condition. The strength of the tested alloy increased with the increased deformation by cold working, the highest tensile strength value reached 637 MPa, while the elongation and electrical conductivity dropped a little. The values of tensile strength, electrical conductivity and elongation were 603 MPa, 79.66%IACS and 9.8% respectively when the second pulling deformation increased to 75.0%, that would meet the requirement of contract wire used in electrical high-speed railway.
Preparation and Characterization of Organic-Inorganic Hybrid Perovskite (C6H5CH2NH3)2CuCl4
Authors: Zou Long , Liu Han Xing , Guo L.L. , Xu Guo Tao , Xue Gai Feng
Published: August 2011

An organic–inorganic hybrid perovskite (C6H5CH2NH3)2CuCl4was synthesized successfully by solution method at room temperature and the thin film of (C6H5CH2NH3)2CuCl4 was also prepared by spin-coating on the quartz substrate. The perovskite and the film were characterized with X-ray diffraction (XRD), Scan electronic microscope (SEM), Atomic force microscope (AFM), Fourier transform infrared spectroscopy and Thermo Gravimetric Analyzer. Results show that the obtained perovskite has unique layer structure and good thermal stability with melting point around 243.3°C. And the prepared film appears very smooth, continuous and uniform with a grain size of 0.1μm, highly oriented with the (0 0 l) planes perpendicular to the substrate surface. Its optical photoluminescence spectrum mainly depends on the inorganic part so the bandgap can be tuned by changing the inorganic composition. The carrier mobility is around 0.26cm2V-1S-1 , which indicates its potential application in field effect transistor with improved film quality.
The Research of Evaluation for Product Conceptual Design Based on ANP and Fuzzy Theory
Authors: Yuan Ping , Wang Mei
Published: August 2011

A approach based on Analytic Network Process (ANP) and fuzzy theory is proposed in order to improve the evaluation system, which is comprised of correlative indexes, of product conceptual design schemes, as well as to select the best scheme and guide the continuous improvement of it. With the application of the concept of fuzzy measure, a new algorithm with ANP is introduced to replace Shapley algorithm to get the fuzzy measures. The interaction values among arbitrary number of evaluation indexes are calculated by plugging the fuzzy measures into the interaction index formula, which is deduced from Shapley value formula and fuzzy reasoning. Then according to the interaction values, the best scheme selected by calculating Choquet integral is improved further. Finally a case study of aged mobile phone design evaluation is conducted to demonstrate the application of this method.
Investigation on Innovative Design Method of Vehicles
Authors: Li Liang Jun , Huang Zhao Hui
Published: August 2011

After thousands of years of evolution and innovation, transportation has become one of the most indispensible industrial products. Along with the increasing demand for transportation, its industrial scale is increasing and it is also a trend for the flourish development of relative disciplines. Based in the innovative method, this article discusses on the means and belief for creative thinking of transportation from a brand new perspective, which in order to promote and contribute to independent innovation of China transportation design.
Study on Diesel Engine Fault Diagnosis Based on Integration of Bayesian and Genetic Neural Network Method
Authors: Wang Xin , Yu Hong Liang , Duan Shu Lin , Yan Jin
Published: August 2011

The characteristic vector of cylinder vibration signal is extracted by wavelet packet decomposition. The factor of selection is proposed to take adaptive integration on basis of improved super parent one dependence estimator Bayesian method and back propagation genetic algorithm neural network method. Experimental results on WD615 diesel engine showed that the method has high accuracy rate of detection.
Stiffness Calculation and Predetermined Preload Optimal Design of Cable Control System
Authors: Yang Chun Ning , Mu Yu Qiang , You Zheng
Published: August 2011

The stiffness of cable flight control systems is one of the most important design parameter for aviation aircraft, because it can change the characteristic of control stick and influence the maneuverability and stability of the flight control system. Flexible cable control system is the main type of mechanical flight control system, in which movement can only be transmitted by cable in tension, the stiffness of cable control system is affected mainly by predetermined preload(PP), however the excessive PP would increase friction between cable and pulley which leads pilot an unfavorable maneuver. In this paper, the theoretical stiffness calculation of cable control system with the complex cable braided construction has been calculated and discussed, in addition the effects of cable deflection and linkage pulley are taken into account to obtain a precise stiffness calculation, and also the predetermined preload related to friction is studied through numerical example, as well as the numerical results have been compared with the experimental results.
Fretting Tribology of Cu Matrix Composite Reinforced by In Situ Al2O3 Particle
Authors: Liu Ai Hui , Ding Hong Yan , Zhou Guang Hong , Zhang Yue
Published: August 2011

Combined SHS with casting, in-situ Al2O3particle-reinforced copper matrix composite was fabricated. The effects of the load and Al2O3particle on the friction coefficient and wear volume were investigated. And the wear resistance of composite was compared with that of pure copper. The results show that with the increase of load, the coefficient of the copper increases, while it decreases slightly as to composite. The wear volume of the composite is always lower than that of copper. The highest relative wear ability is 4.5, which indicates a better wear resistance..