bluuebunny/crossref_metadata_2025 huggingface dataset:
Study on Intermittent Target Tracking in Fire-Control Radar Network
Authors: Xiong Jiu Liang , Han Zhuang Zhi , Xu Hong
Published: March 2011

Intermittent target tracking (ITT) method is proposed based on radar network theory to keep the tracking precision while resisting anti-radiation missile effectively. ITT theory is analyzed first. Then, three relevant evaluation indexes and an improved adaptive sampling algorithm are proposed. Under the same condition, this paper simulated three different target tracking methods, i.e., single radar in ITT, single radar in fixed sampling period tracking and tracking method proposed in the paper. Simulation results show the validity of the method proposed in the paper.
The Usability of Multimedia Electronic Atlas User-Interface Design
Authors: Sun Qing Zhen , Li Rui , Ma Ya Li , Ren Zhong Bin
Published: March 2011

In view of existing usability problems in user interface of multimedia electronic atlas, it applied the usability theory in the user interface design. In this paper, it introduced the usability theory and its application in electronic map field. Then, it analyzed the factors which influenced the interface design of multimedia electronic atlas. Then it designed an experiment to evaluate the usability of multimedia electronic atlas. In the experiment, it found and analyzed the usability problems of the interface. At last, it gave the principles of designing the layout, the colorway, and the tools’ icon of the interface. The result of research provides a theoretic basis for user interface design of multimedia electronic atlas.
Overlay Algorithm for Simple Subdivision of Arbitrary Polygon in Plane
Authors: Guo Xi Juan , Chang Lei , Gao Yan Li
Published: March 2011

The overlay algorithm is an important branch in computational geometry field, it is an important process for computing exact Minkowski sum of two convex polyhedrons. By improving the existing plane sweep algorithm, the overlay algorithm for simple subdivision of arbitrary polygon in plane is given. The algorithm can be used to overlay arbitrary polygon after subdivision into simple polygon in the plane. It has lower time complexity than the existing overlay algorithm. The whole algorithm consists of three steps: line segment intersection, reconstructing topology and constructing the DCEL for overlay graph. The results show that the algorithm can compute the overlay of two planar subdivisions in linear time.
Uncover the Core Conception of Dematerialization and its Measurement in China
Authors: Wang Lei
Published: March 2011

According to the connotation of dematerialization, this paper states that dematerialization plays an important role in deepening the development of Circular Economy (CE), and maintaining balance and function of the eco-economic system. This paper demonstrates the dematerialization nature of CE in terms of de-coupling, and states that the de-coupling between economy and environment is the fundamental goal of CE. It is also proposed to further conceive the de-coupling index system, and to apply it as the measurement tool to the assessment of the CE practice in China.
Experimental Analysis of Electro-Mechanical Characterization of Piezoelectric Stack Actuators
Authors: Ye Hui Qun , Pan Ri Min
Published: March 2011

This paper presents the results of experimental analysis and theoretical research of piezoelectric stack actuators. The key is to understand the behavior of piezoelectric materials mechanical loads in this paper, and to determine optimum working conditions. Based on analysis of some parameters and driven model, which are necessary to performing design optimization to achieve maximum energy transfer and minimum power consume, provide relevant evidence For the subsequent theoretical research.
Computer Simulating Effluent Quality of Vertical Tube Biological Reactor Using Support Vector Machine
Authors: Zhang Jing , Zhou Ji Ti , Li Yu Ming , Yang Hua
Published: March 2011

Effluent quality of vertical tube biological reactor (VTBR) was simulated by support vector machine. AverageR2of the training set and the test set were used to balance the fitness and the predictive ability of SVR models, and evaluate the general performance of SVR models. Following a special grid search procedure, optimal parameters were determined for these SVR models. Results indicted that these SVR models have good fitness and predictive ability. The developed model may be integrated into an advanced control system for the VTBR using different control strategies with further work. Furthermore, SVR was found to be a useful and promising tool that is worth consideration in the prediction of effluent of wastewater treatment processes.
How to Promote Employment by Developing Recycle Economy
Authors: Yu Jiao Long , Li Ying Juan
Published: March 2011

At present, China strongly advocated the development of recycle economy, while most studies are starting from the promotion of economic development and reduction of environmental pollution rather than from the promotion of employment. This paper summarizes some experiences of promoting employment by developing recycle economy in China and abroad, and proposes some advices to solve problems that emerge in the process of developing recycle economy. It puts forward a new view that the recycle economy can promote employment.
A Game Incentive Scheme Integrating Punishment in Vehicular Ad Hoc Networks
Authors: Gui Jin Song , Chen Zhi Gang , Deng Xiao Heng
Published: March 2011

In vehicular ad hoc networks, uncooperative behaviors will impact the reliability of comfort applications, as well as drivers’ decisions, and even invoke serious traffic accidents. In this paper, we propose a novel game incentive scheme to stimulate cooperation among vehicle nodes, consider selfish nodes’ expectations to future payoff and their long-term desires for profit, and show analytically the three incentive-compatible conditions under which selfish nodes will be deterred from cheating by the subsequent punishments. We also discuss the impact on selfish nodes’ behavior, which is caused by their willingness for future collaboration, the parameter values of punishment mechanism and the variation of network load. Simulation results show that, the increase of network load and the deterioration of node’s future profit expectation will motivate nodes toward self-interested action, but our scheme can neutralize this tendency by the careful configuration of punishment parameters, and have favorable incentive effect.
Discussion for Humanized Design in Multimedia Teaching
Authors: Liu Xiao Kui
Published: March 2011

The employing of multimedia in teaching has already become widespread because of its many advantages. In order to avoid boredom and aesthetic fatigue of students, better play its own advantages as well as improve the efficiency and effectiveness of teaching, this paper tends to offer multi methods to realize humanized design in multimedia teaching.
A Valid Path Strengthening Counselor Team Building the Improvement of Actual Effect of Ideological and Political Education
Authors: Yang Jing
Published: March 2011

In 21st century, University students are at the pressure of study, employment, economy and interpersonal communication, thus brings in many thinking and mental problems. So to improve the educational work of university students’ political thoughts including the timeliness of this work is a all-sided system engineering. Universities should insist on the principle of connection between ideological education and management, especially emphasis on instructors on instructors’ integration and mining on university’s ideological and political education resources. Strengthen college counselor’s leading role for college students to establish correct world outlook and outlook on values of the formation, help students better adapt college life, and make them become a national needed all–round talents.
Unequal Interval GM(1,1) Model of Weighted Coefficient Adjustment and its Application
Authors: Zeng Bin , Li Lin Fang
Published: March 2011

Although the grey forecasting model has been successfully adopted in various fields and has been demonstrated prospected aspect. The paper makes the original data multiply the time interval to get the accumulated sequence and uses the difference quotient method to establish the unequal interval GM(1,1) model. In order to reduce the error the paper adopts the weighted coefficient to revise the background values. By fitting and predicting the fatigue strength data it proves the method in the paper is effective which improves the accuracy of the model. It provides an effective way for the grey system application.
Study and Exploration on Computer Graphics Skills Competition of College Students
Authors: Zeng Ling Yi , Zhang Sheng Min , Dong Xin Fa
Published: March 2011

The essay produces some experience and lessons as to skills competition of college students of China universities. It points out that it is good not only for contestants and instructors but also for university. It takes lots of time and money to prepare for competitions. To obtain achievement, instructors and contesters should work hard and they should do much research work on how to improve skills of competition. The authors introduce some experience in details and regard it helpful to guide other skills contests. The experience and lessons has the value of promotion.
A Text Mining Analysis of the Biomimetics Research Trend (2000-2010)
Authors: Wu Shiang Hau , Guo Jiann Jong
Published: March 2011

In recent years, much research has been devoted to the biomimetics research; however, few have deployed the study of the research trend. In fact, grasping the research trend is imperative for enterprises and researchers. The study aims at analyzing the trend change of biomimetics research from 2001 to 2010. The contribution of the study includes the following two points. First, the study has found the shift of the biomimetics research from shifts from “scaffold” and “engine” related issues to the focuses of “surface” and “structure”. Second, the study finds a new way of literature survey by using the text mining method in order to explore the trend change.
A Note on Single-Machine Scheduling with Deteriorating Jobs
Authors: Yin Yun Qiang , Yuan Feng Lian
Published: March 2011

In many real life applications, jobs deteriorate at a certain rate while waiting to be processed. This paper introduces a new deterioration model where the actual processing time of a job depends not only on the starting time of the job but also on its scheduled position. We show that the single-machine makespan minimization problem remains polynomially solvable under the proposed model. We also show that an optimal schedule of the total completion time minimization problem is polynomially solvable under some cases and-shaped with respect to job deterioration rates for other cases.
Constructive Approaches to Biorthogonal Finitely Supported Ternary Wavelets and Wavelet Wraps
Authors: Zhao Jian Tang , Guo Hong Lin
Published: March 2011

In this paper, the notion of biorthogonal two-directional shortly supported wavelets with poly-scale is developed. A new method for designing two-directional biorthogonal wavelets is proposed. The existence of shortly supported biorthogonal vector-valued wavelets associated with a pair of biorthogonal compactly supported vector-valued scaling functions is investigated. A novel constructive method for designing a sort of biorthogonal vector-valued wavelet wraps is presented and their biorthogonality traits are characerized. Two biorthogonality formulas regarding these wavelet wraps are established.
Anti-Jamming and LPI Radar with Spread Spectrum Technology
Authors: Fu Lian Qing , Yang Li Sheng , Ma Ya Ning , Wang Tao
Published: March 2011

In order to enhance the capability of anti-jamming and Low Probability of Intercept (LPI) of radar system, spread spectrum signals are designed for modern radar system. Emission signal is coded with PN codes at the transmitting terminal. Spectrum of signal is spreaded and multi-signal mixed together, so it is not easy to intercept. At the receiving terminal, undesired signals are spreaded when dispreading desired signal. Signal to noise ratio (SNR) of the received signals is raised after despreading, so the detection range broadens. Computer simulations verify the good performance of the proposed approach.
The Investment Risk Early-Warning System Research on Hotel and Tourism Enterprises
Authors: Ma Jun Hai , Zhang Qi
Published: March 2011

This article selects the data of 28 hotel and tourism enterprises on A-shares in china. The investment risk early-warning system construction is based on the information entropy method and the BP neural network. The results show that most of Chinese hotel and tourism enterprises have a high level of investment risk due to the effects of financial crisis and operation, and all of them need to enhance prevention measures.
Application of Fuzzy Mathematics in Diagnosis of WP-JET Engine Ability Failure
Authors: Chai Chun Hong , He Shuai Tian
Published: March 2011

In this thesis we draw fuzzy mathematic methods into the diagnosis of failures of WP-jet engine ability, bring forward setting up the fuzzy membership grade method which was based on the weight statistical, found the fuzzy diagnostic model, resolve to several malfunctions, how nicety to find cause failure really reason, and proffer scientific and feasible method to the airplane failure diagnosis service.
Strategy Analysis of Closed Loop Supply Chain for Scrapped Medical Equipment Based on Hybrid Recycling Model
Authors: Shi Lu , Ma Xin
Published: March 2011

The decision models of closed loop supply chain for scrapped medical equipment that is composed of one medical equipment manufacturer and one medical equipment retailer with product remanufacturing under hybrid recycle strategy was built. The whole-sale price and transfer recycling price were considered as the decision-making variables of the medical equipment manufacturer, and the recycling price as the decision-making variable of the party undertaking the recycling effort. The optimal pricing and the optimal profit were obtained and the optimal decisions of the manufacturer were analyzed on the further. And the profits of medical equipment manufacturer, retailer and the total supply chain are also discussed under different scenario.
Square Root Cubature Particle Filter
Authors: Mu Jing , Cai Yuan Li , Zhang Jun Min
Published: March 2011

The square root cubature particle filter (SRCPF) uses the square root cubature Kalman filter (SRCKF) for generating the proposal distribution. The SRCPF algorithm is easy to be implemented and has numerical stability. Moreover, the SRCKF based proposal distribution approximates the optimal importance distribution by incorporating the current measurement. Simulation results demonstrate that the SRCPF algorithm has the better performance for state estimation than the generic particle filter (GPF), extended particle filter (EPF) and unscented particle filter (UPF), and its calculation cost decreases largely.
Hierarchical Traffic Network Design under Emergency Logistics
Authors: Li Xiao Hui , Tan Qing Mei
Published: March 2011

In response to heavy demand for emergency logistics, an approach based on hierarchical network theory is introduced to solve the complexity of highway transportation network. It groups the traffic network into subprime networks and backbone networks on which a virtual local area network is designed accordingly to fulfill such function as information exchange and road condition renewal between forwarding stations. Compared with flat networks, the hierarchical traffic network design is in a good position to speed up routing, to conduct real-time monitoring and data-exchange, and consequently enhances efficiency of emergency logistics.
Prediction Model of Least Squares Support Vector Machine of Increased Memory Type Based on GA and Quadratic Renyi-Entropy
Authors: Zhao Guan Hua , Yan Wen Wen
Published: March 2011

In order to improve the accuracy of financial achievement, this paper applies a new forecast model of the Increased memory type least squares support vector machine base on neighborhood rough set and quadratic Renyi-entropy on the basis of the traditional support vector machine prediction model. The paper also independently derives the entropy fit for the financial distress prediction which is in discrete sequence, as well as the expression of support vector machine kernel function. The experimental results show that the improved model is significantly superior to the traditional LS-SVM as well as the standard support vector machine prediction model, regardless of the forecast accuracy , training samples number.
Distribution Strategy in Storage and Retrieval System Based on Improved Genetic Algorithm
Authors: Dong Xiang
Published: March 2011

Automated storage system has become a sign of enterprise production automation and management information. The design, optimization and simulation has become a key in modern logistics technologies. This paper studied the optimal cells distribution strategies and the storage and retrieval path optimization. Firstly, the distribution strategies are analyzed, then, the mathematical model is presented. An improved Genetic Algorithm is used to solve the model. The approach is finally illustrated by a practical example.
D–S Evidence Theory and its Application in Robot Information Fusion
Authors: Sun Yu Sheng , Zheng Cai Ling , Ma Ping
Published: March 2011

Multisensor information fusion is wildly treasured and used in the mobile robot field.This thesis describes D–S evidence theory about photoelectric encoder,laser sensors and CCD camera.Because D-S evidence theory allows the existence of uncertainty, we may obtain the event probability according to experience.As a result,it is easier to promote the application.Therefore robot can do autonomous navigation and obstacle aviodance in unknown non-structure environment safely. If the system increased other sensors in the future perfect process,we can also adopt this approach to integration. The experiment results show that the improved D–S evidence theory can eliminate the noise interference,handle signals smoothly and improve the system control precision.
Making-Decision of Selecting Outstanding Teachers in University Based on Fuzzy Comprehensive Evaluation Method
Authors: Liu Jun , Li Yan
Published: March 2011

Evaluation of teachers is one of the most important sectors for colleges and universities to foster a high-quality teaching staff influencing the training qualities of students directly. Scientific and rational evaluation of teachers has the important guide functions to improve the quality of teachers, inspire teachers' potential and creativity and encourage teachers to make constant progress. It is difficult to evaluate one teacher objectively and fairly using the ordinary evaluation method for the influencing factors are more and complex. The fuzzy comprehensive evaluation method of selecting outstanding teachers in university is proposed in this paper, its main goal is to make the scientific and rational evaluation on one teacher and select outstanding teachers. Finally, an example of fuzzy comprehensive evaluation on one certain teacher for the illustration of the proposed method is represented, the result indicates that the scientific and rational evaluate result is provided by the fuzzy comprehensive evaluation method.
Benefit Evaluation of Government Emergency Procurement Based on AHP Method
Authors: Liu Jun , Dong Qian Li , Xiao Kai Hong
Published: March 2011

In order to evaluate the benefit of government emergency procurement, analytical hierarchy process method (AHP method) is used in this paper. After establishing a clarity and comprehensive government emergency procurement evaluation index system, which includes emergency benefit, economic benefit and social benefit, this paper applies the AHP method on the system and gives the specific calculating process. Calculating results show that the most important benefit evaluation index is promptness rate of time. It means that the government has to procure materials as soon as possible after emergencies. The application of AHP method on determining the importance of indexes reflects the objectivity and impartiality of benefit evaluation process. It is an effective and practical method and can be applied in other fields.
A New Airborne Passive DF Method only Based on Frequency Difference
Authors: Yu Tao
Published: March 2011

If three antenna units are divided into two set and two baselines are placed at right angles to each other in flight plain, in which the direction of one baseline is parallel to the actual flight direction of air vehicle, the sine and cosine function of target bearing respectively in two baseline directions can be simultaneously obtained according to the analysis principle of the direction cosine change rate. The angulations’ formula only based on Doppler frequency difference can be derived after eliminating the unknown parameters including angular velocity and wavelength by the specific value of two circular functions. The analog calculation shows that the relative error is in direct proportion to the baseline length provided that the incident wave is parallel in derivation. But the error analysis depicts that the measurement accuracy is in direct proportion to the baseline length. Moreover, the measurement error relies on mainly the accuracy of frequency measurement. Furthermore, the derived formula has irregularity in airborne axis direction. However, since the new method is not associated with wavelength, this new DF only based on Doppler frequency difference will be more adapted to passive sounding as compared with phase interference method.
The Application of Communication for Inspection System in 500kV Transformer Substation
Authors: Wang Wen Xing , Chu Qing He
Published: March 2011

The monitoring of equipment capability has been strengthened by personnel to meet the inspection standard and intelligent in order to improve the reliability of substation electrical equipment and safety of operating. The system based on Bluetooth wireless communication technology has been pointed out to realize intelligent inspection substation. The system include monitoring terminals, transfer stations, control stations, and has the advantages of inspecting intelligent objectives, high data transmission speed, status inquiries and analysis of inspection equipment running etc.
Decoupling Analysis of a Four Degree-of-Freedoms Parallel Robot
Authors: Gong Jin Liang , Huang Feng An , Zhang Yan Fei , Wei Xiu Ting
Published: March 2011

A type of 4-PPPR parallel manipulator is presented. The kinematics model of this mechanism is founded and kinematics solutions of both direct and inverse are given in closed form by means of coordinate transformation. For convenience to analyze the same kind of mechanisms, a new concept of even-group decoupling is put forward from a more common sense. A study is made on the 4-PPPR parallel manipulator using this method and it proves to have excellent character of decoupling which is of great importance for its path planning and real control.
Data Mining in the Research of Corporate Acquisition Performance
Authors: Yue Qi
Published: March 2011

With a descriptive and predictive ability, data mining can discover the hidden patterns of data from a large-scale data warehouse by precise mathematical means, which is valuable for decision making, especially for corporate top management. With a regression analysis based on a large survey data, this paper examines an important issue concerned to corporate acquisition. It is found that acquisition performance is positively influenced by organizational adjustment, top management turnover, buyers’ experience, target firm’s performance, and business relevance, and negatively influenced by region distance, shareholding ratio, state-owned shares of buyers, and relative size. The founding can have some theoretical value for corporate decision on the process of acquisitions and how to enhance acquisition performance and also indicate the practical value of data mining technology.
The Protection of Thyristor in Motor Control System
Authors: Du Guang Chao
Published: March 2011

The bearing ability of thyristor to over-voltage and over-current is poor. According to the causes lead to over-voltage and over-current , adopting over-voltage protection such as RC snubber, vristor, and so on, and limiting reactors, current sensing devices, fast fuses, etc. are used in fast over-current protection.
Influence Factors of Traffic Signs Comprehension Effectiveness and Analysis of the Model in Ice Snow Environment
Authors: Hu Li Wei , Pei Yu Long , Fu Chuan Yun
Published: March 2011

Some factors affect the driving behavior seriously, for example driving visibility, velocity, headway, driver’s vision and psychology&physiology etc. This paper, base on analyzing visibility under different conditions, analyzed the influence to driving visibility in ice & snow environment, and studied driver’s vision and psychology&physiology in the same environment through experimentation. So studying on driver’s comprehension effectiveness of traffic signs under the ice and snow condition and establishing the model, this is in favor of providing the theory evidence for installing traffic signs considering the effect from ice and snow in the long period of ice and snow season northeast area, in china.
Types Synthesis of Redundant Actuation Parallel Robot
Authors: Gong Jin Liang , Zhang Yan Fei , Wei Xiu Ting
Published: March 2011

Redundant parallel robots have been under increasing developments from a theoretical view point as well as for practical applications. Compared with the traditional parallel manipulators, they have such merits of more load, faster speed and higher accuracy. The method about how to build up redundant actuation parallel robot is introduced. Considering that the kinematic joint and limb are basic elements to constitute a proper parallel robot mechanism, special Plücker coordinates is adopted to describe the displacements of the output link of a limb or the robot mechanism. Then the principle for design of the redundant actuation parallel robot mechanisms is presented and example of the 2RRR&2PP parallel robot mechanism is brought forth and analyzed by this method.
The Complex System Modeling and Analysis on the Government Public Information Resource Allocation Mechanism
Authors: Jia Wei Qiang , Huang You Fang , Wang Yun Zhu , Zhou Ping
Published: March 2011

Based on the system analysis on the Government Public Information Resource Allocation Mechanism, this paper utilizes the Rate-Variable Fundamental In-tree Modeling method, establishes the structure model effectively depicting the Public Information Resource Allocation Mechanism. Utilizing the X-0-1 determinant feedback archetype calculating method put forward by the author, this paper calculates the system minimal based model set, through the analysis on the minimal based model, generates the corresponding management countermeasures perfecting the Public Information Resource Allocation Mechanism and realizes the purpose of analyzing Public Information Resource Allocation Mechanism effectively utilizing system science method.
Communication Technology Research Based on EtherNet/IP
Authors: Chen Zai Ping , Wei Yi , Jia Chao
Published: March 2011

EtherNet/IP is a superior mainstream industrial EtherNet which defines an open industrial standard and combines traditional EtherNet with industrial protocol, according to these advantages EtherNet/IP has a good prospect for development. In this paper the structure of EtherNet/IP protocol is analyzed, and the mainly EtherNet/IP data communication mechanism is discussed. The development method of EtherNet/IP communication software under Linux operating system is given. By using PCU - ETHIO board as experimental equipment, some experiments are carried out. The result of experiment has confirmed that, the research of EtherNet/IP data communication mechanism and the development scheme of EtherNet/IP communication implementation proposed in this paper are correct and effective.
Natural Nearest Neighbor for Isomap Algorithm without Free-Parameter
Authors: Zou Xian Lin , Zhu Qing Sheng , Yang Rui Long
Published: March 2011

Isomapis a classic and efficient manifold learning algorithm, which aims at finding the intrinsic structure hidden in high dimensional data. Only deficiency appeared in this algorithm is that it requires user to input a free parameterkwhich is closely related to the success of unfolding the true intrinsic structure and the algorithm’s topological stability. Here, we propose a novel and simplek-nn basedconcept: natural nearest neighbor (3N), which is independent of parameterk, so as to addressing the longstanding problem of how to automatically choosing the only free parameterkin manifold learning algorithms so far, and implementing completely unsupervised learning algorithm3N-Isomapfor nonlinear dimensionality reduction without the use of any priori information about the intrinsic structure. Experiment results show that3N-Isomapis a more practical and simple algorithm thanIsomap.
Experimental Research on Mechanical Adaptability Properties of Tri-Axis Differential-Drive In-Pipe Robot
Authors: Sun Li Xia , Zhang Qi Jiu , Jiang Sheng Yuan , Jiang Xu Dong , Wang Yao
Published: March 2011

An off-line analyzing system is developed to investigate the mechanical adaptability properties of tri-axis differential-drive in-pipe robot. It can real-time obtain the reference velocity without trackslip and the practical velocity for the driving wheels, load carrying properties for the in-pipe robot, as well as the current and voltage of the driving motor. The mechanical adaptability property indexes, such as the driving efficiency, adaptive precision and differential velocity property, are proposed and determined in experiments for the in-pipe robot. It is indicated that the tri-axis differential-drive is provided with the high driving efficiency and differential velocity precision, verifying its remarkable adaptability to various in-pipe configuration.
A Mechanical Model for TRIP Sheet Steel Forming
Authors: Shan Ti Kun , Liu Li
Published: March 2011

An enhanced elastic-plastic constitutive equation taking into account strain induced transformation and its effect on work hardening of TRIP steel during deformation are investigated. The transformation rate relies on the stress triaxiality. The strain hardening of the TRIP steel takes on parabola shape because of the austenite changed to the martensite during straining. The physical model is verified by comparing with the stress-strain relation of the uniaxial tension experiment. The results showed that the steel keeps a high hardening potential which retards the onset of necking and a good formability thanks to the martensitic strain-induced transformation and the subsequent austenite hardening.
Biodegradable Poly(lactic Acid)/TDI-Montmorillonite Nanocomposites: Preparation and Characterization
Authors: Chen Na Li , Feng Hui Xia , Guo Jing Wei , Luo He Ming , Qiu Jian Hui
Published: March 2011

Activated montmorillonite(MMT) was modified by toluene diisocyanate(TDI) and TDI-montmorillonite(TDI-MMT) was prepared. The characterization of TDI-MMT was carried out by X-ray diffraction(XRD) and fourier transform infrared spectrometry (FT-IR). The results showed that TDI had been inserted to the interlayer of MMT and the interlayer spacing of MMT increased by 0.26nm. With stannous chloride as catalyst, the biodegradable polylactide acid/TDI-montmorillonite(PLA/TDI-MMT) nanocomposites were synthesized through ring-opening polymerization of lactide in the layer of TDI-MMT by in-situ polymerization. The structure and thermal stability of nanocomposites were investigated by XRD, FT-IR and thermogravimetry (TG). Exfoliated nanocomposites were obtained as shown by XRD results. FT-IR spectra confirmed that TDI-MMT participated in the ring-opening polymerization of lactide. TG analysis indicated the decomposition temperature of nanocomposites rose and the thermal stability was improved contrast to the neat PLA. The effect of the content of TDI-MMT on the molecular weight and thermal stability of nanocomposites was studied. With the increase of the proportion of TDI-MMT, the molecular weight of resultant nanocomposites decreased and the decomposition temperature rose at the range of experiment research.
Mechanical and Interfacial Properties of Hydrolyzed Kevlar Fiber Reinforced Wood Flour/HDPE Composites
Authors: Ou Rong Xian , Wang Qing Wen , Yuan Fei Pin , Liu Bao Yu , Yang Wei Jun
Published: March 2011

Hydrolyzed Kevlar fibers (KFs) were compouded into high-density polyethylene (HDPE) with wood flour (WF) by twin-screw/single-screw extruder to investigate the reinforcement effects of KFs on the mechanical properties of conventional WF/HDPE composites. Maleated HDPE (MAPE) was used as a compatibilizer. The mechanical properties significantly improved as the KFs loading increases in the presence of 4% MAPE, such as tensile strength 14.7%, tensile modulus 12.4%, flexural strength 22.2%, flexural modulus 22.4%, and impact strength 41.7% with 2 wt.% KFs compared to WF/HDPE composite with MAPE. The fiber matrix morphology of the interface region in the composites was examined using scanning electron microscopy (SEM).
Modification of Poly(vinylidene Fluoride) by Grafting of Functional Monomer 3-(Trimethoxysilyl)propyl Methacrylate
Authors: Liu Li Na , Chen Ying Bo , Zhang Yu Feng
Published: March 2011

3-(trimethoxysilyl)propyl methacrylate was grafted into alkali treated poly(vinylidene fluoride) (PVDF) using free radical polymerization. 1H NMR, IR and DSC spectra of the modified polymer showed that double bonds were produced on PVDF and that 3-(trimethoxysilyl)propyl methacrylate was successfully grafted to PVDF. The membranes prepared using the grafted PVDF showed higher flux and better mechanical property than the pure PVDF membranes.
Thermal Conductivity of Composite Silicone Rubber Filled with Graphite / Silicone Carbide
Authors: He Yan , Wu Xue Sheng , Chen Zhen Chao
Published: March 2011

Graphite flakes and silicone carbide particles are used as heat conductive fillers added into methyl vinyl silicone rubber, and the effect of filler amount, filler shape and different curing agents (DCP, DBPMH) on the thermal conductivities of silicone rubber are investigated in this article. The results reveal that the thermal conductivities of composite silicone rubber will be increased with the increase of the amount of fillers. While the filling content surpasses a certain value, the thermal conductivity of composite increases obviously. The silicone rubber filled with graphite flake possesses a higher thermal conductivity than that filled with silicone carbide particles at relative high fillers content, but both of them are close to each other at relative low fillers content. Moreover, the thermal conductivities of composite silicone rubber filled with the powder form curing agent (DCP) are better than that of composite silicone rubber filled the liquid form curing agent (DBPMH).
The Cooling Time of Gas Assisted Injection Molding
Authors: Bu Qiu Xiang , Zhang Xiao , Chen Hai Ying , Yin Qing Zhen
Published: March 2011

The mathematical model of solid-liquid interface is obtained by making an idealized hypothesis for parameters of the cooling process in gas-assisted injection molding, and simplifying the mathematical model. And then the cooling time of plastic products in the process is obtained by using two ways of solving the solid and liquid phases. And verified by example the conclusions that some plastic products of gas-assisted injection molding, when the materials and workmanship conditions are constant, cooling time of the airway is proportional to the square of the wall thickness is obtained.
Control of Residual Vibration in Micro-Positioning Platform
Authors: Ji Hua Wei , Hu Xiao Ping
Published: March 2011

A flexure hinged micro-positioning platform driven by piezoelectric actuator is a under damped system, without compensation, the open loop transient response exhibits high degree of overshoot and residual vibration. In order to reduce residual vibration, the basic conception of input shaping technique (IST) was introduced; the inherent essence of IST suppressing residual vibration was studied, and a four impulse input shaping controller was designed to reduce residual vibration. The experiment results revealed the proposed input shaping controller to be effective in reducing residual vibration.
Three-Dimensional Temperature Field of Mixer Chamber Analysis
Authors: Bian Hui Guang , Wang Chuan Sheng , Wang Rui Qin , Wang Zhen Zhen , Zhang Jun Ling
Published: March 2011

This paper analyzes the three-dimensional temperature field of mixer chamber during the mixing process by using the finite element method. The paper focuses on analyzing the three-dimensional temperature field of mixer chamber, the distribution of heat transferring, and the influence of forced cooling on the mixing temperature, and has verified by experiment the accuracy of finite element simulation of mixer chamber temperature.
Effect of Helium on Synthesis of Carbon Nanotubes from the V-Type Pyrolysis Flame
Authors: Liu Yuan Chao , Sun Bao Min , Ding Zhao Yong
Published: March 2011

Synthesis of carbon nanotubes from V-type pyrolysis flame is a kind of novel method. It needs more simple equipments. The V-type pyrolysis flame experimental system is introduced. Carbon source is the carbon monoxide and heat source is from acetylene/air premixed flame. Pentacarbonyl iron is acted as catalyst. The sampling time was 5 minutes. This study aims to find the influence rule of helium in synthesis of carbon nanotubes from the V-type pyrolysis flame. Carbon nanotubes with less impurity and high yield were captured successfully in the V-type pyrolysis flame. The carbon nanotubes were between 10nm and 20nm in diameter and dozens of microns in length. Helium played extremely important role in the flame synthesis of carbon nanotubes. The effect of helium is to dilute the concentration of combustible and reduce the flame temperature. Hydrogen also can keep the catalyst particles remain active and increase the yield of carbon nanotubes. Too high or low mass flow of helium was not appropriate for the formation of carbon nanotubes in V-type pyrolysis flame. The carbon nanotubes with "carbon tumour" will appear when the flow of helium is too high. Too low flow of helium will reduce the number of carbon nanotubes due to lack of cooling and dilution of the protection gas. It was found that the optimal flow of helium was about 0.283 SLM according to the experimental results.
Effect of Hydrogen on V-Type Pyrolysis Flame Synthesis of Carbon Nanotubes
Authors: Liu Yuan Chao , Sun Bao Min , Ding Zhao Yong
Published: March 2011

Synthesis of carbon nanotubes from V-type pyrolysis flame is a kind of novel method. It needs more simple equipments. The V-type pyrolysis flame experimental system is introduced. Carbon source is the carbon monoxide and heat source is from acetylene/air premixed flame. Pentacarbonyl iron is acted as catalyst. The sampling time was 5 minutes. This study aims to find the influence rule of hydrogen in synthesis of carbon nanotubes from the V-type pyrolysis flame. Carbon nanotubes with less impurity and high yield were captured successfully in the V-type pyrolysis flame. The diameter of carbon nanotubes was approximate between 10nm and 20nm, and its length was dozens of microns. Hydrogen played extremely important role in the flame synthesis of carbon nanotubes. The effect of hydrogen is to improve the pyrolysis of carbon monoxide and to decompose the carbide on the surface of catalyst particle. The flow or concentration of hydrogen will directly decide the surface roughness of carbon nanotubes from the pyrolysis flame. The carbon nanotubes with "carbon tumour" will appear when the relative flow of hydrogen in the reaction gases is too little. Not only the mass flow of hydrogen is important, but also the ratio of mass flow between carbon monoxide and hydrogen is very important according to the experiment results.
Application Analysis of Radial Tire Mould Assembly Process
Authors: Tian Zhong Ke , Zhang Zi Hao , Hu Hai Ming , Li Xiao Bin
Published: March 2011

The segmented mould is key equipment for vulcanizing meridian tires. It can open and close along radial direction and results in the minimum deformation on tire shape. This article introduced the structure of inclined plane radial parting mold and illustrated assembly methods to every part of the radial parting mold in detail and problems should be noticed. At last, this article presented the pressure test contents of semi-steel and all-steel mould and pointed certain adjustment methods to unreasonable gaps in segmented mould.
Experimental Investigation of the Thermoplastic Tapioca Starch/Sisal Fiber Composites
Authors: Mo Xian Zhong , Zhong Yu Xiang , Pang Jin Ying , Guo Ting , Qi Xiang
Published: March 2011

As the matrix of sisal fiber, thermoplastic tapioca starch(TPS) was prepared with the mixed plasticizer, formamide and urea (mass ratio 2:1). X-ray diffractograms showed that with increasing fiber content(below 30phr), cellulose crystallinity at 22.5° gradually got stronger but starch crystallinity at 15.3°, 17.1°, 18.2°, 23.5° already disappeared, showed that this matrix still restrained the retrogradation of starch. SEM micrographs showed good dispersion and adhesion between starch and fiber. Studies in the dependence of mechanical properties of reinforced TPS on the fiber content from 0 to 30phr, the initial tensile strength was quadrupled up to the maximum 21.83MPa at 20phr fiber content, while the elongation at break was reduced from 72% to 0.44%. TG mass loss curves showed that thermal stability of this composites had great improved under 500°C.
Numerical Analysis on Temperature Field in a LED Module
Authors: Du Dong Xing , Li Ying Ge , Luo Xiao Bing
Published: March 2011

The working temperature has great effect on the reliability of LED modules. In this paper, numerical analysis is carried out on predicting the temperature field in a LED module based on simplified two-dimensional model. It is found that the highest temperature manifests in the LED chip and more than 99% of the heat generated by the LED chip are transferred out through the copper heat sink. Parametric study shows significant temperature increment from 327K to 384K in the LED lighting chip by decreasing 10 times of the thermal conductivity values of conductive layer from 24.5W/(m.K) to 2.45W/(m.K). It is concluded that the key factor in heat transfer process inside the LED module is the thermal resistance of the thermal conductive layer lying between LED chip and copper heat sink.
Fixed Bed Column Studies for the Sorption of 2,4,6-Trinitrotoluene on the Aminated Lignin
Authors: Zhang Jian Ping , Lin Xiao Yan , Luo Xue Gang , Zhang Chi
Published: March 2011

A fixed bed column of aminated lignin (AmL) was used for the adsorption of 2,4,6-trinitrotoluene (TNT) from aqueous solution. The effects of AmL, bed height, inlet TNT concentration and feed flow rate on the breakthrough characteristics of the adsorption system were studied. It was found that deeper bed depth, higher initial concentration and lower flow rate were favorable to the adsorption of TNT on the AmL column. The adsorption data fitted well with the Thomas and Yoon–Nelson models. The AmL was shown to be suitable adsorbent for adsorption of TNT using fixed-bed adsorption column.
Graft Copolymerization of Soybean Protein Isolated and Methyl Acrylate as a New Thermoplastic Material
Authors: Lu Yan , Luo Xue Gang , Lin Xiao Yan , Zhang Chi
Published: March 2011

New thermoplastic soy protein isolated (SPI) and methyl acrylate (MA) copolymers (T-SPI-g-MA) were prepared using graft copolymerization and initiated with ammonium persulfate (APS). The reaction conditions such as initiator concentration and temperature on the graft percentage (GP) were investigated. The single factor experimental showed that the optimal conditions for grafting of 15g SPI were: 4 g initiator of APS, 60 mL monomer of MA and in 250 mL 2M urea aqueous solution at 70 °C for 3 hours. The products were characterized by means of FT-IR and DSC. The results indicated that the monomer was grafted successfully on SPI and the T-SPI-g-MA had a glass transition at 22 °C.
Study on Mechanism of Strengthened Vortex Diffusion for a Punched Agitator
Authors: Chen Jian Guo , Luan De Yu , Zhu Xiao Chen
Published: March 2011

The mixing mechanism of a punched agitator used in solid-liquid suspension system was studied basing on the enstrophy and energy dissipation of the vortex theory. The effects of the configuration parameters on stirring performance were discussed. The results show that efflux from such punched agitator with simple structure can not only strengthen vortex diffusion, but also reduce the power consumption by diminishing the projection area in the direction which the paddles round. Obviously, this is beneficial to lower critical suspension velocity and promote mixing efficiency in stirring tank. It is indicated that the punched agitator owning quite broad application prospects.
Studies on the Influencing Factors of Biodegradable Buffer Material
Authors: Wang Chuan Sheng , Meng Guang Zhen , Su Hui Hui
Published: March 2011

Biodegradable buffer materials are yhfriendly to the environment and better suited for a number of applications. Many factors affect properties of biodegradable buffer materials. They can generally be divided into technological factors and formula factors. Elasticity and tensile strength are two indicators of quality. Through experiments study, the starch granules are initially fragmented, and then under temperature and shearing by the extrusion. Starch is destructured, plasticized and melted. The elasticity and the tensile strength of the composite material were got. Combination of technological factors include screw configuration, screw speed and die temperature; formulations include foaming agent, filling dosage, and so on. The results showed that each factors had different influences on the properties of the biodegradable material.
Transcriptional Factor NF-κB as a Target for Therapy in Parkinson's Disease
Authors: Flood Patrick M. , Qian Li , Peterson Lynda J. , Zhang Feng , Shi Jing-Shan , Gao Hui-Ming , Hong Jau-Shyong
Published: March 2011

Parkinson's disease (PD) is a neurodegenerative condition characterized by chronic inflammation. Nuclear factorκB (NF-κB) is a family of inducible transcription factors that are expressed in a wide variety of cells and tissues, including microglia, astrocytes, and neurons, and the classical NF-κB pathway plays a key role in the activation and regulation of inflammatory mediator production during inflammation. Activation of the classical NF-κB pathway is mediated through the activity of the IKK kinase complex, which consists of a heterotrimer of IKKα, IKKβ, and IKKγsubunits. Targeting NF-κB has been proposed as an approach to the treatment of acute and chronic inflammatory conditions, and the use of inhibitors specific for either IKKβor IKKγhas now been found to inhibit neurodegeneration of TH+ DA-producing neurons in murine and primate models of Parkinson's disease. These studies suggest that targeting the classical pathway of NF-κB through the inhibition of the IKK complex can serve as a useful therapeutic approach to the treatment of PD.
Multimodality Imaging in the Evaluation of Cardiovascular Manifestations of Malignancy
Authors: Jiménez-Juan Laura , Leen Jessica , Wald Rachel M. , Nguyen Elsie T. , Yan Andrew T. , Kirpalani Anish , Wintersperger Bernd J. , Crean Andrew M.
Published: March 2011

Up to one third of the population will die as a direct result of cancer. Accurate and timely diagnosis of disease often requires multiple different approaches including the use of modern imaging techniques. Prompt recognition of adverse consequences of some anti-cancer therapies also requires a knowledge of the optimum imaging strategy for the problem at hand. The purpose of this article is to review not only some of the commoner cardiovascular manifestations of malignancy but also to discuss the strengths, weaknesses and appropriate use of cardiovascular imaging modalities.