bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on the Stability and Structural Optimization of Self-Elevating Platform Pile Foundation
Authors: Chu Xin Jie
Published: July 2011

This paper analyzes the stability and structural optimization of self-elevating platform pile foundation, preliminarily discusses the method of analyzing the bearing capacity of the layer soil foundation, and establishes the numerical computation models for the whole platform, pile, pile shoe, etc. Besides, through these analyses, the pile structure is optimized, and the stress concentration in the joint between pile and pile shoe is reduced. Also, this study is of reference value for the analysis on the self-elevating platform pile foundation design and the platform operation stability.
Application of the Predictive and Inferential Control to Pulp Washing Process
Authors: Tang Wei , Shan Wen Juan
Published: July 2011

In pulp washing process, as the series characteristic of Dilution Factor (DF), plasma layer thickness and washing water flow, a new predictive inference control algorithm is applied to pulp washing process. Simulation in pulp washing process shows that the algorithm not only improved the response speed of unpredictable variable but also can be an monitored value for the production process.
A Concise Method of Characteristic Analysis for Sciences Universal Machine
Authors: Hu Hao
Published: July 2011

The series universal machine could be operated on d.c. or a.c. source. It was relatively complicated to analyze its operating characteristic. A good concise analysis method was introduced. By using the phase diagram to from a ‘circle diagram’ and the relationship between the pertinent line segments and the angles, its operating characteristic was got. Namely, its operating characteristic was the variation of current, torque, power, speed, etc. as the load was varied.
Antireflection with Multilayer Structure Used on Silicon Solar Cell
Authors: Wang Wen Liang , Rong Xiao Hong
Published: July 2011

The refractive index of silicon material is very high, and antireflection coatings are widely used to improve conversion efficiencies of silicon solar cells. An ideal antireflection structure should lead to zero reflection loss on its surfaces over an extended solar spectral range for all angles of incidence. Based on optical thin film theory, a multilayer structure are adopted as initial stack, and with the aid of conjugate graduate optimized method, a broadband and wide-angle antireflection is designed for using on silicon solar cell. In our design, the incident angles of antireflection coating are considered from to , working wavelength ranges are considered from 400nm to 1200nm. Within these ranges, the design results show that it can reduce residual reflection evidently in theory.
Characteristics Study of Knocking, Fuel Consumption and Emissions with Cooled External EGR on SIDI Turbo Charged Gasoline Engine
Authors: Zu Ying Li , Zhou Zheng Xin , Yu Hong Yang
Published: July 2011

Based on 2.0L spark ignition direct-injection(SIDI) turbo charged gasoline engine with variable valve timing(VVT), the spark timing effects on combustion process, fuel consumption, knock limitation and emissions were studied with external exhaust gas recirculation(EGR) on different loads and speeds. For the purpose of easily comparing data results, the location of 50% mass fraction burned(CA50) was widely used in this paper. The study results show that CA50 is changing linearly with spark timing. To reach the same combustion phase, spark timing need to be further advanced with external EGR. Combustion variability of IMEP(COV) increase sharply with retarding of CA50 with external EGR. The external EGR can greatly improve knock limitation and knock intensity(KI). To reach the best fuel consumption, CA50 need to be advanced to 6 °CA to 8 °CA for both with external EGR and without external EGR. NOx emissions increase with advancing of spark timing. HC show different trends when retarding spark timing with and without external EGR.
Path Planning for Mobile Robot Search and Rescue Based on Improved Ant Colony Optimization Algorithm
Authors: Ding Yu Feng , Pan Qian
Published: July 2011

Aiming at disasters such as fire, earthquake etc. city disaster complex environment, a robot search path algorithm based on ant colony algorithm is put forward in this paper. Suppose environmental was known, we use grid method to divide and model the whole environment space and put forward some improvement in dead circulation, optimizing parameters, stimulating factors for the basic ant colony algorithm, which improved the ant colony algorithm’s robustness effectively. Finally, we obtain search path through numeric experiments in the simulation rescue scenario and make a comparison with original results. Experiment results show the effectiveness of the proposed algorithm and the improved rationality. It will be a good basis for later path planning research in unknown environment.
The Study of Arc Welding Power Circuit Based on Forward Converter with LCD Nondissipative Snubber
Authors: Huang Peng Fei , Zhang Chun Lei , Sha Li Jun , Wang Shi Jun
Published: July 2011

Through the study of double switch forward converter, an arc welding power circuit with LCD nondissipative snubber is designed by using IGBT as its power switch. The operating principle of this converter is analyzed in detail; the design considerations of key circuit parameters for the topology are introduced. The LCD nondissipative snubber can not only suppress the voltage spike, but also reduce switching loses and improve power density and efficiency. Furthermore, the snubber itself is lossless. The paper provides the foundation of researching high efficiency power circuit based on Interleaving Two-Transistor converter. The experiment results of the prototype coincide with the theoretical analysis and the validity of analysis approach is proved.
Friction and Wear Properties of Carbon Fiber Reinforced PEEK Composites under Water Lubrication
Authors: Zhang Jian Guo , Cai Chi Lan
Published: July 2011

The present study establishes the relationships between the carbon fibers (CF) content and the trbological properties of Polyether ether ketone (PEEK) composite. PEEK composites such as unreinforced PEEK, reinforced PEEK with different content of carbon fibres were used for the tribological tests. The results indicated that CF/PEEK composite had better tribological properties than pure PEEK. Some CF was ground and squeezed, then mixed with debris on the worn surface, which improved the wear resistance greatly. The low friction coefficient of CF/PEEK composite caused little change in the temperature and further ensured the stable state of sliding.
Grain Growth Kinetics of a Ti+Nb Stabilized 12%Cr Ferritic Stainless Steel at High Temperature
Authors: Song Chang Jiang , Zhu Liang , Guo Yuan Yi , Li Ke Feng , Sun Feng Mei , Zhai Qi Jie
Published: July 2011

By using a thermal simulator this work investigated grain growth behaviour of a Ti+Nb stabilized 12%Cr ferritic stainless steel at high temperature. The results showed that the grain growth rate was less than 1.8μm/s at the temperature of 1200°C, but it suddenly became very high and reached about 50μm/s when the temperature was 1250°C. Analysis results indicate that grain growth of this steel is affected by the small particles on the grain boundaries, and grain growth exponent is about 3.3. Moreover, the activation energy of the grain growth is when the temperature is above 1250°C. Compared with a 27Cr ferritic stainless steel containing only 0.14%Nb, the grain growth exponent of this steel is greater, and grain initial rapid growth temperature is higher.
Application of Nondestructive Testing in Bridge Structure Quality Detection
Authors: Chen Jing Xi , Yuan Li , Zhang Guang
Published: July 2011

This paper discusses recent nondestructive testing technology in the application of bridge structure, which focus on common rebound method and electromagnetic induction method. According to the actual measurement problems, the article explains the rebound method and electromagnetic induction method including their advantages and disadvantages, and puts forward the method of avoiding problems.
The Tribological Properties of Blending PA6 with POM Composite
Authors: Cai Chi Lan , Li Jian
Published: July 2011

The aim of this work is the evaluation of the effects of PA6 content on the friction andwear properties of POM composite system. Friction andwear properties of PA6/POM composite were determined with the help of pin-on-disc tribometer in sliding contact with a steel-ball at room temperature without lubrication. The spectroscopic investigations reveal that the increasing concentration of PA6 has a drastic influence on crosslinking efficiency due to their interference with POM in curing process. As a result, POM filled PA6 with higher concentration showed remarkably enhanced friction and wear properties.
Optimization for Crashworthiness of Urban Transit Trains Using Genetic Algorithm
Authors: Xie Zhuo Jun , Xu Ping , Luo Yu Qi
Published: July 2011

As it is tough for the current energy absorb devices of urban vehicles to meet the crashworthiness requirements in the collision scenario of 25km/h, a methodology to improve the general crashworthiness is presented. A multi-criteria optimization, with the deformations and accelerations of all cars as the design functions and the force characteristics of end structures of cars as design variables, is defined and the Pareto Fonts are obtained. Then defining energy absorbed as design function, a single criteria optimization is made and the specific goal is achieved. No explicit relationship could be found between the design variables and the design functions, so a crash model of a train with velocity of 25km/h colliding to another train stopped is built and the genetic algorithm is chosen to solve the optimization problems. The results indicate that the crashworthiness performance of the trains is significantly improved and the crashworthiness requirements could be reached finally.
Effect of CeO2 Loading on the Performance of Pd/γ-Al2O3 Catalysts for one-Step Synthesis of Dimethyl Ether
Authors: Meng Xian Liang , Liu Ya Fei , Zhang Zhong Cai , Chu Rui Zhi , Zong Zhi Min , Wei Xian Yong
Published: July 2011

A series of Pd-CeO2/γ-Al2O3 catalysts which have a different CeO2 loading were prepared by impregnation under microwave irradiation. Based on various characterizations, such as XRD, H2-TPR and CO-TPD, the effect of CeO2 loading on catalytic performance and stability of Pd/γ-Al2O3 were examined for one-step dimethyl ether synthesis from syngas. The results show that there are two completely opposite effect on the CO conversation rate of Pd/γ-Al2O3 catalysts after adding CeO2, namely that it can improve Pd dispersion at a suitable loading, hence the CO conversation rate will increase too. However, the surface area and total pore volume of Pd/γ-Al2O3 catalysts decrease by adding excessive CeO2 and CO conversation rate will also reduce. When the CeO2 loading achieve to 2%, catalysts can have relatively high catalytic stability and activity that the CO conversation rate and DME space-time yield can reach 64.7% and 27.82 mmol·ml-1·h-1, respectively.
Solution of Software Test of Computerized Numerical Control (CNC) Systems
Authors: Wang Yi Chen , Wang Yi Kun
Published: July 2011

Software has been used more and more widely in CNC systems, the defects caused by soft­ware among all defects of a CNC device have been higher and higher as well. How to diagnose the defects caused by software in CNC device fast and effectively is the topic of this paper. This paper talks about the features of embedded soft­ware first, and then introduces a proved method used in software test and defect diagnosis by using software system test platform. We’ll use an instance to elaborate on it. We’ll make a general summary of this method at the end of the paper.
Experimental Study on the Compressive Properties of a Kind of Carbon/epoxy Composite
Authors: Tian Chun Lei , Pi Ai Guo , Huang Feng Lei
Published: July 2011

In order to understand the quasi-static and dynamic compressive mechanical properties of carbon/epoxy composite laminates consisting of unidirectional carbon fiber plies and carbon fabric plies, several quasi-static and dynamic compression experiments were performed along three principal material axes. Dynamic compress experiments were conducted using the compression split Hopkinson’s pressure bar (SHPB) and MTS machine respectively. The experimental results showed that the materials had obvious strain rate effect. The performance of the composites in each of the three principal directions had unique characteristics. In the vertical direction of the carbon cloth, the materials had an obvious linear constitutive relationship. In-plane along the 0° carbon fiber direction, the carbon fiber controlled the mechanical properties and the strain rate effect. Specimens were also equipped with various failure modes. Failures were due to shear fractures in the normal direction and due to delamination and splitting failures in the in-plane direction. Identical tests were conducted for the unidirectional laminate. The results show that the static compressive strength and the dynamic peak stress values of fabric laminates were higher than those of unidirectional laminates under the same conditions.
Research on Thermal and Moisture Comfort of Seamless Knitted Fabric Made of Triangle-Hollow Nylon
Authors: Jin Zi Min , Shen Qiao Hua , Fan Ming Shan , Tao Jian Wei
Published: July 2011

To research thermal and moisture comfort of seamless knitted fabric made of triangle-hollow nylon which is developed newly, the paper chooses triangle-hollow nylon, circle-hollow nylon and ordinary nylon as fiber material and every nylon adopts weft plain, one-and-one mock rib and one-and-three mock rib for test weaving. Then nine samples are obtained. The paper analyses their air permeability, moisture permeability and warmth retention property. Result indicates that air permeability and moisture permeability of seamless knitted fabric made of triangle-hollow nylon are better than that of two other kinds of nylon’s seamless knitted fabric.
Full Information Fusion and its Application in Fault Diagnosis for Rotary Machinery
Authors: Dong Xin Min , Han Jie , Hao Wang Shen
Published: July 2011

The rotor motion and the information fusion of single section were discussed; the fault diagnosis method for rotary machinery based on the full information fusion of two sections was put forward, and the back propagation neural network model was established. Engineering practice indicated that the fault diagnosis accuracy based on the information fusion of two sections was higher than that based on the information fusion of single section.
Graphical Detection Method for Delaminations
Authors: Zhang Zhi Fang , Shankar Krishna , Tahtali Murat , Morozov Evgeny V.
Published: July 2011

In this paper, a simple graphical method for the detection of delaminations in damaged composite laminates is introduced. By using this method, both delamination size and location can be predicted accurately. First, a frequency database for the damaged beams with a range of delamination sizes and locations is generated using a Finite Element (FE) model; then for each mode, a surface plot relating the delamination size, location and frequency shift is generated. The next step is to look up the actual frequency shift (either from numerical simulation or experiment) from surface plots relating to three or more modes to get the intersection curves, which show the possible combination of delamination size and location for each mode. Finally the intersection curves of different modes are plotted together and the intersection point of all the curves indicates the possible delamination size and location, where the frequency shifts for all the modes can be matched. We demonstrate that this method is able to predict both delamination size and location fairly accurately. This method can be expanded to detect the propagation of delaminations by only monitoring the shifts in natural frequencies. It has the potential to detect multiple delaminations through continuous monitoring, provided that they do not occur simultaneously. This method has promising applications in the Structure Health Monitoring (SHM) of composite structures.
Energy Partition of Harmonic Waves through a Micro Gap
Authors: Chen Xiao Yun , Yu Gui Lan
Published: July 2011

Energy partition of harmonic waves through a micro gap considering frictional contact was investigated. The incident waves were assumed to be strong enough to make the two solids come into contact. Using the Fourier analysis technique and corrective solution superposition method, the nonlinear boundary problem was reduced to a set of algebraic equations. Special examples for identical materials were discussed in detail. The locations and extents of the separation, slip and stick zones and the energy partition are displayed. Moreover, the effects of gap width, coefficients of friction and incident angle are discussed. These relations are quite effective on seismology and civil engineering.
Study of the Spectral Responsivity for the 900 nm Centered Filter Radiometer
Authors: Zhang Jian Ling , Lu Xiao Feng , Guo Min Chen , Yang Jia Jian , Yuan Zun Dong
Published: July 2011

The spectral responsivity of the filter radiometer（FR）is an essential parameter which needs to be measured accurately in the radiometric determination of the thermodynamic temperature. In this paper the facility of the spectral responsivity measurement and a 900 nm centered FR are studied. The influence issues of the facility and the FR, including the central region, wings and the wavelength step, are discussed. The measurement repeatability of the integration of spectral responsivity is estimated 0.03%, which is suitable for the requirement.
Research on Value Chains : a Case of the Tobacco Enterprise
Authors: Huang Dong Bing , Guo Fei Fei
Published: July 2011

Firstly, the basic thoughts of value chain are discussed. Secondly, combining the practical of the tobacco enterprise the application of value chain is analyzed in marketing process. Finally, the importance of the application of value chain is putted forward, in order to improve the competition of the tobacco enterprise. Case study shows that value chain analysis is useful and helpful for the tobacco enterprise management.
Rubber Joint for Fatigue Crack Factors Numerical Analysis of Certain Vehicle
Authors: Wang Sheng Wu , Wang Wei Da , Zhou Dian Mai
Published: July 2011

The main factor of rubber fatigue was stress field. But the way is not sensitive in many cases. To clarify which factors were the main for predict the locations of fatigue crack, we analyzed the factors of stress field and strain field of rubber joint, and relations between the factors and the locations of fatigue crack, using 3D FE simulation. The result showed stress concentration was not sensitive to predict the locations of fatigue crack. The locations are close to strain concentration of rubber joint. In this paper we propose the approach of using strain concentration to predict the fatigue crack locations for rubber joint. This result is significant for the rubber joint design and the study of fatigue strength theoretic.
Microstructures and Properties of Fe/B-Fe Coating Used in Circulating Fluidized Bed Boiler
Authors: Tian Qi Fa , Sun Hong Fei
Published: July 2011

Electric arc praying technology was used to produce Fe/B-Fe coating on the carbon steel substrate. The microstructures was studied by means of scanning electronic microscope (SEM), X-ray diffraction (XRD), transmission electron microscope (TEM) and electron probe microanalysis (EPMA). Mechanical performances, wear resistance of coating were tested . The results showed that the resistance to abrasion and corrosion of Fe/B-Fe coating was respectively 16 times and 5 to 6 times higher than those of bare metal.
Simulation of Flow Field and Temperature Tield in the Process of Filling and Solidification for K424 Alloy Thin-Walled Casting
Authors: Wang Xin , Zhang Zhi Jun
Published: July 2011

In order to improve the utilization of K424 alloy, Z-Cast analysis software is used to get three-dimensional flow field and temperature coupling simulation in the process of K424 alloy castings filling, by considering the effection of pouring temperature, casting speed, shell thermal conductivity and temperature on the morphology of filling.A three-dimensional simulation of temperature changes in solidification process of molten metal was performed based on the filling simulation. The simulation results on flow field and temperature field shows the order of filling and solidification in different parts of the casting ,and determines the position where cold shut and misrun appears, which provides theoretical support to the improvement of technology plan.
Analysis on the Transition Mode of Lift-Fan VTOL
Authors: Zheng Zhi Cheng , Zhu Xiao Ping , Chang Min , Zhou Zhou
Published: July 2011

Based on the propeller momentum theory, this paper obtained the momentum model for internal flow of lift fan system for analyzing power characteristics in transition of lift-fan VTOL. This paper mainly focused on total lift, total drag and total power during the whole transition with the increase of freestream velocity. The analysis results show the particular characteristics of total drag and total power in transition, which can be used for selecting parameters at the preliminary phase of designing lift-fan VTOL.
Application and Verification of Describing Function Method in Solving the Hunting Limit Cycles for Railway Vehicle
Authors: Hong Chun Lei , Geng Yue , Hu Yong Sheng
Published: July 2011

It is presented to solve the hunting limit cycles of railway system with multiple degrees of freedom and strongly nonlinear factors by describing function method(DFM). A nonlinear railway vehicle model with several dry friction factors is developed, and the 16 nonlinear transcendental equations of it are deduced using DFM. The modal characteristics of the hunting limit cycle for the vehicle model are obtained by the software programmed to solve complicated equation set. To verify the accuracy of describing function method, the hunting limit cycles of the model are simulated in time domain, and the results from these two methods have good consistence. This shows that the limit cycles of nonlinear rail vehicle systems with strongly nonlinear factors can be solved with high accuracy and efficiency by DFM, which of value in practical engineering application.
Effect of Nano-Al2O3 Particles on the NiP/nano-Al2O3 Coatings’ Properties
Authors: Yuan Xue Tao , Hua Zhi Qiang , Wang Lei , Sun Dong Bai , Chen Song Lin
Published: July 2011

Composite coatings were prepared using electroless nickel bath containing different concentrations of Al2O3nano-particles. The analyses of coating compositions, carried out by EDS, showed that there is marginal difference between phosphorus contents of NiP and NiP/nano-Al2O3deposits. The structure of the coatings was examined by scanning electron microscopy (SEM), and X-ray diffraction (XRD). It has been found that the co-deposition of nano-Al2O3particles with Ni disturbs the NiP coating’s regular surface structure and increases its surface roughness. DC and AC electrochemical tests were carried out on such coatings in a 3.5wt.% solution of NaCl in order to evaluate their corrosion resistance. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) tests both showed that, the corrosion resistance of NiP-Al2O3coatings firstly increases and then decreases when Al2O3concentration in electroless bath is increasing, but the corrosion resistance of NiP-Al2O3composite coating is better than that of amorphous NiP coating.
A Novel Method to Suppress the Body’s Vibration Based on Time Delay for the Case of Idling
Authors: Ren Chuan Bo , Liu Lin
Published: July 2011

In this paper, the theory of DR (Delayed Resonator) is employed to investigate the vibration of vehicles, for the first time, and the process to suppress the vibration transmission from the engine to the body using the DR is explored. A simplified half-car model with DR is built for the case of idling, and the critical time delay is obtained by analyzing the stability of the model, additionally, the different effect of the parameters on the stable region is investigated. Method of solving the optimum values of the gain and the delay for maximum vibration suppression is built, afterwards numerical emulation is carried out to check the effect and to compare with the hydraulic engine mount. The results show that the amplitude of the body can be reduced more effectively.
Research on Nonlinear Dynamics of Liquid Sloshing in Rrectangular Ttank
Authors: Tang Yi , Zhu Xiao Ping , Chang Min , Zhou Zhou
Published: July 2011

Based on the assumption of ideal fluid, this paper both employed modes method and pressure variational principle to transfer free boundary value problem describing liquid nonlinear sloshing into infinite dimensional modal system integrated by Runge-Kutta method. The results shows that nonlinear characteristics of liquid sloshing in rectangular tank.
Study on Synthesis and Properties of Novel HTPB/PEG Polyurethane Copolymers
Authors: Luo Yan Ling , Miao Yan , Xu Feng
Published: July 2011

Two novel polyurethanes (PU) with alternating and random block architectures, hydroxyl-terminated polybutadiene (HTPB)/polyethylene glycol (PEG) block copolymers, HTPB-alt-PEG and HTPB-co-PEG, were synthesized via a coupling reaction route between hydroxyl groups and isocyanate groups. The structural and crystal characterization was conducted by means of FTIR, and phase behavior was examined by SEM and DSC. The biodegradation in a simulated human body fluid was investigated through mass loss and SEM. The experimental results indicate that all polyurethane samples form the microphase separation structure, and the separation degree depended on their sequence structure and the molecular weight (MW) of PEG, and further affecte their in-vitro degradation.
Limit Cycle Flutter Analysis of Plate-Type Beam with Dissymmetrical Subsection Linear Stiffness
Authors: Lu Li , Yang Yi Ren , Fan Chen Guang , Zhang Ming Lu
Published: July 2011

The limit cycle flutter of a plate-type structure with dissymmetrical subsection linear stiffness in incompressible viscous flow was studied. Galerkin Method was used to get the differential equations of system. The equivalent linearization concept was performed to predict the ranges of limit cycle flutter velocities. The flutter borderline map was used to analyze the the stability of limit cycle flutter. By numerical integrating, the velocities of convergence, flutter and instability were obtained. The theoretical results agree well with the results of numerical integration.
Research of Advanced Manufacturing Technology’s Impacts on Manufacturing Industry
Authors: Ding Shu Hui , Zhong Pei Si
Published: July 2011

In the recent two decades, Advanced Manufacturing Technology (AMT) has been deeply applied in every aspect of manufacturing system, which has made great impacts on manufacturing industry and caused great changes. This paper has studied the deep impacts of AMT on manufacturing industry at the aspects of modeling mode, design mode, design test and evaluation method, working mode and production organization mode.
On a Type of Single-Curved Cable-Strut Grids Generated by Semi-Regular Tensegrity
Authors: Shi Tian Sheng , Lu Jin Yu , Yao Liu Zhen , Du Yuan Lin
Published: July 2011

Tensegrity is a novel structure which attracts structure engineers’ interest because of its light weight and efficient structural behavior. Nowadays researches are mainly concentrated in the area of regular and irregular tensegrity, both of which are not suitable in many situations on account of their shapes or member length conditions. Thus, a new concept of semi-regular tensegrity was proposed in this paper. Based on the singular value decomposition of equilibrium matrix, an enumerative algorithm for the form-finding of semi-regular tensegrity was presented. According to the distribution of the minimum singular value of matrix, the configuration of semi-regular tensegrity was discovered. The obtained tensegrity was used as modulus for the generation of single curved cable-strut grid. A numerical example was illustrated to indicate that the proposed tensegrity modulus was feasible and advantageous in constructing single-curved tensegrity grid. Finally, the future research in the area of semi-regular tensegrity and its application was prospected.
The Study on Financial Management Assessment based on Analytical Hierarchy Process
Authors: Tang Jian
Published: July 2011

Analytical hierarchy process method is proposed to assess financial management to realize the accurate financial management assessment in the paper. Analytic hierarchy process is a kind of hierarchical structure, which can estimate the impact of each index by determining the membership between up layer and bottom layer and gaining the weights of each index relative to assessment object. Assessment indexes of structural levels are established by analyzing the correlation of each index. Characteristic vector of the pairing comparison matrix which can be taken as the weights of assessment factors for financial management is established based on analytical hierarchy process. The weights provide a basis for rationality of finance management.
Preparation of Cu/ZrW2O8 Gradient Films Using Different Targets
Authors: Yan Xue , Li M. , Li Jun , Cheng X.
Published: July 2011

The Cu/ZrW2O8gradient films have been deposited on silicon substrates by RF magnetron sputtering with copper and compound targets followed by annealing in argon atmosphere at 750 °C for 3 min. The three different compound targets were B1 (nZrO2:nWO3=1:2.2), B2 (nZrO2:nWO3=1:2.5) and B3 (ZrW2O8), respectively. The as-deposited gradient films were amorphous, while a post-deposition annealing at elevated temperature was required for the development of the cubic ZrW2O8. The structure and surface morphology of the gradient films were then studied using X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Energy Dispersive Spectrometer (EDS). The globular and slender rod crystals can be found in annealed films, which are copper and ZrW2O8, respectively. The fine gradient film should be obtained using the target B1.
The Application of Numerical Simulation on the Research of Performance with Wave-Plate Gas-Liquid Separator
Authors: Yu Yun Liang , Wang Zhong Yi , Han Jia , Sun Tao
Published: July 2011

This paper presents a thorough study of the wave-plate gas-liquid separators. The resistance curve has been obtained by the method of combining numerical simulation and experimental research. The separation efficiency curve under rated conditions for the droplet with different particle diameters has been obtained by using stochastic trajectory model. This can provide a new method for the research of wave-plate gas-liquid separator. The results obtained here may provide some new theoretical guidance for the development and optimal design of wave-plate gas-liquid separator.
Study on ERP Experiment Paradigm of English Vocabulary Process
Authors: Yan Ran Ran
Published: July 2011

English vocabulary processing is the English language comprehension link, refers to the word's meaning gain. The research is mainly lexical processing around English lexical access and vocabulary ambiguity resolution launch. In the English vocabulary Tonga study, form, sound effect has been the researchers’ point of contention. In the English vocabulary ambiguity resolution research, sentence the function of context and sentence contexts and ambiguity word different meaning interaction is to understand English vocabulary, is also the key ambiguity resolution English ambiguity resolution model the essence of debate. Long-term since, the researchers using behavioral research methods of these problems, and puts forward the research of English vocabulary to various theoretical model processing. However the traditional study methods often exist in the supreme task interference, unable to accurately existing in the process of linguistic understanding of automatic processing and cognitive real-time processing processes.
Study on the Remelting Process of Rare Earth Al-4.5Cu
Authors: Yi Rong Xi , Zheng Xiao Qiu , Xie Shi Kun , Guo Xiu Yan
Published: July 2011

The influences of heating temperature and holding time on the microstructures were investigated during the semi-solid remelting process of rare earth Al-4.5Cu alloy. The evolution mechanism of crystal organization was discussed. Experiments show that the heating temperature and holding time are very important to the grain size and uniformity. It is the most suitable parameters, as heating temperature is 630°C and holding time is 20 minutes, to remelting process. During the remelting process, grain mergering and Ostwald growing up is the main mechanism of change on microstructures.
Preparation Technology on Semi-Solid of ZL101
Authors: Yi Rong Xi , Huang Wen Xian , Liu Zhao Hui , Xie Shi Kun
Published: July 2011

The semi-solid microstructure of ZL101 alloy was fabricated by technology of vibrating inclined cast. The effections of length of slope and vibration voltage on microstructure were also investigated. The experimental results showed that two parameters played an important role on the microstructure of ZL101 alloy. The homogeneous, small and rounded sphere-like semi-solid equiaxed crystals were obtained when the ZL101 alloy was cast in water-cooled copper mold with 25cm slope length at 640 °C and 60v vibration voltage, the average grain diameter and shape factor of which was 26.5um and 0.8, respectively.
Supporting the PKM with Blog in the Digital Environment
Authors: Li Ting Jun
Published: July 2011

It's well recognized that the PKM is one of the essential factors to an individual's development and success in the era of knowledge-oriented economy. Based on the introducing and analysis of some features and functions of both Blog and PKM,this paper argues that Blog not only improve intercommunication but also support and facilitate PKM. Furthermore,some effective approaches to supporting the PKM with Blog are explored,and some problems and suggestions are put forwarded in this paper too.
Preparation and Property Research of PC/PLA Composites Modified By ABS Blending
Authors: Chen Yi , Zeng Guang Sheng , Jiang Ping , Li Xiang Gang , Huang Yu Gang
Published: July 2011

PC/PLA composite material introduces the degradability of PLA to PC with great performance, but their compatibility and impact resistance are poor. Aiming at this deficiency, ABS is used to modify PC/PLA. This paper established the ternary compound system of PC/PLA/ABS by melt blending and studied the impact of adding ABS and compatibilizer ABS-g-MAH on the composite’s morphology, thermal properties, rheology and mechanical properties. The results showed that: ABS bettered the brittle fracture of PC/PLA and improved the impact strength of composite with the optimum proportion of 30% of PC/PLA mass. In addition, ABS-g-MAH effectively improved the compatibility of the composites as well as mechanical properties of materials. With the increase of ABS, the crystallization ability of PLA in the composite improved and the thermal stability of the system deteriorated slightly, the melt shear viscosity of composite also decreased.
Characterizations of Fatigue Deformation and Fracture Behavior of Commercially Pure Iron with Grain Boundary Micro-Voids
Authors: Yun Jong Guk , Cao Xin Ming , Wang Yue , Kang Yan , Li Xiao Wu
Published: July 2011

Fatigue deformation behavior of the commercially pure iron containing micro-voids at grain boundaries (GBs) were investigated under total strain amplitude control, and fatigue fractures were quantitatively characterized by fractal analyses. The cyclic response curves of the CP iron show an initial softening stage within early several cycles followed by a continuous cyclic hardening. No stress saturation phenomenon was found. Pre-existence of micro-voids at GBs spurs intergranular cracking to become a common damage mode besides transgranular cracking along slip bands. Quantitative analyses of fracture surface demonstrate that the value of fractal dimension D of the scanning profile in the crack growth zone is the largest as compared to those in the crack source zone and final rapid fracture area, almost regardless of the applied strain amplitude. This phenomenon was discussed in terms of the tortuosity of crack propagation path.
Plastic Deformation Behavior of Differently Oriented Fe-35wt.%Cr Alloy Single Crystals Containing Cr-Rich Precipitates under Uniaxial Compression
Authors: Cao Xin Ming , Guo Wei Wei , Li Xiao Wu
Published: July 2011

The plastic deformation behavior of the and [014] Fe-35wt.%Cr alloy single crystals containing fine Cr-rich precipitates were investigated under uniaxial compression. The compressive flow behavior is slightly sensitive to the crystallographic orientation. These two oriented crystals exhibit a clear yield plateau in their compressive stress-strain curves, but the yield plateau of the [014] crystal is somewhat shorter than that of the crystal. As the compressive strain is lager than a certain critical value, e.g., ~13% and ~18% for the [014] and crystals, respectively, the work hardening rate for both two orientations decreases obviously, but the decrease in work hardening rate is more remarkable for the [014] crystal rather than the crystal. These phenomena are discussed to be all related to the interactions between moving dislocations and fine Cr-rich precipitates, and the interaction intensity depends strongly on the orientation. Careful observations of slip deformation characteristics and dislocation structures well provide supports for the explanations to the macroscopic compressive plastic flow behavior.
Action Simulation between Pin Sleeves of Output Mechanism and Cycloid Gear of Three-Gear Reducer
Authors: Sun Ying Shi , Guan Tian Min , Liu Run Ze
Published: July 2011

In this paper, the new driving structure of three cycloid gears at eccentric angle of 120 with one another is adopted so as to get rid of the weakness for the bearing of rotating arm. Thus, under the condition of that the basic dimension is not changed, by conducting optimization of profile modification and parameters optimization on traditional structure, the axial dimension is increased by width of one cycloid gear transmitting torque is increased about 40%, and the goal of large capacity with small size is realized. Three main forces are stressed upon the cycloid gear in actual work: the meshing force between gear and cycloid gear, the force upon the cycloid gear by the pin of output mechanism and the force upon the cycloid gear by the bearing of rotating arm. The paper mainly aims to work out the force upon the cycloid gear by the pin of output mechanism.
Research on the Relationship between Stabilization Problem and Tracking Problem of Missile Control System
Authors: Lei Jun Wei , Tang Jing , Wu Hua Li
Published: July 2011

The stabilization problem of a system without parameter uncertainties can always be transferred to a tracking problem if it is no need to consider the robustness requirement of a system. But those two questions are not the same for a missile control systems. In this paper, the uncertainties of parameters are considered, and we found that the stabilization problem can not be transferred to a tracking problem.
Two-Phase Matrix of Ni3Al and γ- Ni Coatings Prepared by Laser Cladding
Authors: Cheng Guang Ping , He Yi Zhu
Published: July 2011

As a solid solution matrix alloy, nickel-based alloys have the shortcomings that the strength will decrease with increasing temperature. The significance of this experiment is forming the two-phase matrix, in which γ- Ni solid solution are replaced partly by Ni3Al with potential performance at high temperature. In this paper, no visible cracks and pores Ni3Al/γ- Ni composite matrix coatings were prepared on mild steel substrate by laser cladding with mixed powders of two common thermal spying powders of Ni60AAA alloy and Ni-coated Al. The microstructure and phase constitution of the coating were studied through SEM, EDX and x-Ray diffraction analysis technique. The results show the composite coating consists of γ- Ni, Ni3Al, Cr23C6 and CrB, both the main matrix γ- Ni solid solution and the second matrix phase of Ni3Al being free uniformity dendrite and containing some alloying elements such as Fe, Cr, Si, etc,with the dendrites surrounded continuously by the eutectic. It may be possible for improving high-temperature performance.
Preparation of Compound Aloe Film and Tests of its Film Performance
Authors: Xue Chun Lan , Gao Wei , Li Ying , Tong Jing Zhi , Zhang Shuo , Zhang Yan Wen
Published: July 2011

OBJECTIVE To prepare traditional Chinese pharmaceutical film which can be absorbed through derma and have an effect of topical antibacterial , and take examinations of its film performance. METHODS The active ingredients extracted from the traditional Chinese medicine such as Aloe are blended in a certain proportion as the dressing of chitosan and casted into films. The thickness of the films were measured by the thickness measurement instrument, and the performance of the films was tested and compared such as film forming, swelling and solubility, water holding capacity and permeability. RESULTS Aloe compound film as external applied agent has a desired film performance. CONCLUSION Aloe compound film which could be transdermally absorbed presents a promising potential in adjuvant therapy of ulcers, bedsores and other skin of mucous membrane infections.
A Simple Differential Sliding Mode Design for the Overload Control of Missile System
Authors: Zhang Wen Guang , Lei Jun Wei , Cheng Jie
Published: July 2011

A simple differential sliding mode control law was designed for the missile overload control system without considering the uncertainties of air-dynamic coefficients. The sliding mode was composed of overload error and the differential error of overload. Finally, a numerical simulation was down and it testified that it is unable to make the system stable with only pure overload control strategy. Although the sliding mode was arrived , Oscillation phenomenon was caused by the poles in imaginary axis.
Spheroidal Graphite Iron with High Ductility at Cast State and Produced by Cupola Melting
Authors: Peng Xian Ping
Published: July 2011

This paper described an industrial scale experience of melting as-cast high-ductility nodular iron. We discussed the rationale of selection of chemical compositions and the practice of speroidising and inoculation processes. The experimental results show that nodular iron castings with consistent quality at cast state can be produced using cupola melting technique. The castings of two heavy truck components–brake shoes and brake plates produced meet the technical requirements set in China standard GB/T1348-2009.
Study on Blast-Resistant Structural Design of a Truck Cab
Authors: Han Shou Hong , Lv Zhen Hua
Published: July 2011

This paper first presented modeling methods and procedures aiming to a truck cab and its occupant under blast loading, followed by numerical simulation analysis of dynamic responses of the cab and blast injuries of the occupant by using Ls_Dyna. According to energy history the response duration can be divided into three phases, corresponding to local effect, whole effect and drop down effect. And two schemes for cab blast-resistant design including an aluminum foam sandwich plate and a V-shape deflector were put forward. Using the proposed numerical models, response characters of the two schemes were analyzed, advantages and shortcomings were compared with the initial design. Simulation results show that dynamic responses of cab structure and occupants decrease obviously by using sandwich structure filled aluminum foam, but for a V-shaped deflector it is very difficult to protection the cab structure and occupants simultaneously. And effect of several key parameters, i.e. relative density of foam core, and core thickness were discussed also.
Study on Cutting of Laser-Preheated Mullite
Authors: Ho Ching Yen , Wen Mao Yu , Tsai Yu Hsiang , Ma Chung
Published: July 2011

A thermal model for laser-assisted cutting of mullite is developed in this paper. Laser-assisted cutting has been proposed as a promising means for achieving cost-efficient production of high quality ceramic parts. At high temperatures the yield strength of ceramics can decrease below the fracture strength, changing the material deformation behavior from brittle to ductile and enabling the use of a single point cutting tool to remove material at rates approaching those of metal cutting. Assuming the system to be symmetrical and neglecting the heat loss taken away by removal material, the problem is formulated in a cylindrical coordinate system that moves with the laser beam or cutting tool. An analytical solution for this thermal model is obtained. The results calculated by this model agree with the available experimental data. The temperature history is presented during laser-assisted cutting of mullite. The effects of feed rate and laser power on temperature history are also discussed in this study.
Generalized Predictive Control of Neural Network Based on LM Optimization
Authors: Wang Si Ming , Xu Jian Yu , Zhai Yu Qian
Published: July 2011

Starting from the establishment of generalized predictive model based on neural network, LM optimization algorithm is applied to the perdictive control model for study in order to solve these problems that the training speed of the BP network is slow and it is easy to trap into the local minimum.Generalized predictive control and neural network which has the capability of approaching any nonlinear function are combined to forecast the future outputs of the system.LM algorithm is used instead of gradient descent method to optimize controller parameters and it makes full use of Jacobian matrix information identified by neural network.The result of Matlab simulation indicates that the neural network using LM algorithm has the feature of fast convergence rate,model of high precision and good robustness,which is more suitable for real-time nonlinear control.
Stabilization of Chaotic System with Uncertain Parameters
Authors: Sun Wei Ming , Wang Xin Yu , Lei Jun Wei
Published: July 2011

Based on Lyapunov stability theorem, a common adaptive strategy was designed for a common class of chaotic systems with uncertain parameters. And the discuss on the sign of unknown parameters were avoided because of the adopting of a novel kind of adaptive weight turning law. At last, the convergence time was analyzed to provide a dynamic information for system users
Model Predictive Control for Direct-Drive Wind Power Generation Systems
Authors: Yang Yong
Published: July 2011

Permanent magnet synchronous generator (PMSG) are commonly used in direct-drive wind power generation systems, which produce high efficiency, high reliability and low cost in wind power generation. This paper presents a new and simple control scheme using predictive control, which is used in PMSGs and grid-connected inverters. The controller uses the models of PMSGs and grid-connected inverters to predict on each sampling interval. A cost function defines the desired behavior of the system. The switching state that minimizes the cost function is selected and applied during the next sampling interval. At any wind speed within the operating range, the PMSG rotor speed can optimally controlled to extract maximum wind power. The simulated results show that the proposed control scheme can provide the direct-drive wind power generation system with the maximum efficiency and high dynamic performance.
Research on the Tracking Problem of Chaotic Systems with Static Uncertain Function and Unknown Parameters
Authors: Sun Wei Ming , Wang Xin Yu , Lei Jun Wei
Published: July 2011

Considering the situation with both unknown multi-parameters and uncertain multi- functions, a robust adaptive controller was constructed to solve the tracking problem of a general class of chaotic systems. What is worthy pointing out is that the uncertainties are assumed to be bounded with triangular functions which is meaningful in engineering application.