bluuebunny/crossref_metadata_2025 huggingface dataset:
Improvement on Reading and Writing for Replica Consistency
Authors: Ren Xun Yi , Wang Ru Chuan , Ma Xiao Dong
Published: February 2011

Maintaining consistency among replicas is an important technique for improving the efficiency of data grids. In order to improve replica consistency management, one fast reading and writing method is proposed, where two update algorithms is applied to accelerate Maintaining consistency among replicas. The first layer is synchronization writing form one peer to many peers at the same time, thus avoiding repeat read and writing of replica from the primary node. In second algorithm the node with good bandwidth is elected as new master node to enlarge the number of concurrent update streams. The experimental results show that the proposed model can reduce complete time compared with lazy copy, positive copy in some scenes.
A Matrix Method for Calculation of the Approximations under the Asymmetric Similarity Relation Based Rough Sets
Authors: Wang Lei , Li Tian Rui , Ye Jun
Published: February 2011

The essence of the rough set theory (RST) is to deal with the inconsistent problems by two definable subsets which are called the lower and upper approximations respectively. Asymmetric Similarity relation based Rough Sets (ASRS) model is one kind of extensions of the classical rough set model in incomplete information systems. In this paper, we propose a new matrix view of ASRS model and give the matrix representation of the lower and upper approximations of a concept under ASRS model. According to this matrix view, a new method is obtained for calculation of the lower and upper approximations under ASRS model. An example is given to illustrate processes of calculating the approximations of a concept based on the matrix point of view.
The Control of Leontief Model on Industry Manufacturing Process
Authors: Cui Yong Liang
Published: February 2011

The classic Leontief model on industry manufacturing process is investigated. A kind of discrete-time singular dynamic input-output model of industry manufacturing process based on the classic Leontief Model is provided and the stability of this kind of model is researched. By the new mathematic method, the singular dynamic input-output system will not be converted into the general linear system. Finally, a sufficient stability condition under which the discrete-time singular Extended Leontief Model is admissible is proved.
A New ISODATA Image Segmentation Algorithm Based on Intuitionistic Fuzzy
Authors: Wang Yin Long , Lin Ke Cheng , Yu Hong Mei , Li Qian Jin , Li Zhi Xiang , Wang Xi Wu
Published: February 2011

ISODATA algorithm is capable of splitting and merging categories automatically. However, this kind of hard clustering fails to take into consideration the characteristics of image itself and human visual features. So its effect is generally not as good as that of fuzzy clustering algorithm. For most fuzzy recognition methods, if they are to be applied, the number of categories must be set beforehand. Besides, there is inherent defect in traditional Fuzzy algorithms. By contrast, intuitionistic fuzzy is a kind of improvement to make up the deficiencies of traditional fuzzy theory. Based on the advantages of ISODATA algorithm and intuitionistic fuzzy, with those critical functions which are related to membership and non-membership functions used as the measurement for clustering, this thesis is to propose a kind of ISODATA algorithm that is based on intuitionistic fuzzy, and to introduce membership function that has been improved for practical purposes. This kind of function takes region as the sample to be classified. Finally, this thesis is to verify the effectiveness of the proposed algorithm by applying it to Image Segmentation.
An Overview of Quotient Space Theory
Authors: Wang Xu , Ding Shi Fei
Published: February 2011

Granular computing (GrC) is another solving method of artificial intelligence problems after neural network, fuzzy set theory, genetic algorithm, evolutionary algorithm and so on. GrC involves all the theories, methodologies and techniques of granularity, providing a powerful tool for the solution of complex problems, massive data mining, and fuzzy information processing. Quotient space theory is a representative model of granular computing. In this paper, first the current situation and the development prospects of quotient space theory are introduced, then the basic theory of quotient space granular computing are presented and the stratified and synthesis principle of granularity are summarized. Finally we discuss some important issues such as the application and promotion of quotient space
Perception of Motion Trajectory as a Spatial Concepts Activity for Children
Authors: Lin Chien Yu , Hung Pi Hsia , Jen Yen Huai , Lin Chien Chi
Published: February 2011

This study proposes to develop a best treatment interface of motion trajectory as a construct for children to build up their sense of spatiality. There are 30 children from kindergarten participate in this research. There are two factors in the study, first is the “leading object” and the other is the “reference object”, and each factor contains two levels, hence, there are four treatments in this experiment. This research uses “maze” as a spatial sense conceptual tool, and the maze is constructed by 3D models as a virtual environment. The focus of this research is to find out the best treatment and does not cause cognitive burden on children in the meantime. The result of this research is that the best tr eatment of motion trajectory depends on the treatment of “leading object” with “reference object” for children when they grab spatial concepts.
The Study on Psychological Health Education in Sport Teaching
Authors: Gong Xiang Hui
Published: February 2011

It has been found that psychological health education and physical exercise are equally important sports teaching. Due to the college students are in the stage of growth and learning knowledge, the sport education teachers should actively learning psychology teaching theory and application to the sports teaching can truly training team who have a strong physique, a healthy psychological quality and perfect personality.
The Effect of Distinctive Tunnel in Sport Teaching Reform
Authors: Shao Lin Hai
Published: February 2011

Through the interpretation of the unique tunnel in sport teaching reform, it is pointed out the tunneling effect in sport course. In the process of reform, which has played a positive role in promoting sport course? We need seize the opportunity to reform, it should be noted that since reform surface full .The result is difficult and unpredictable. Because of professional tunnel effect, we must grasp and summarize its process, for sport teaching reform, and we use it to get better reform.
FPGA-Based In-Circuit Verification of Digital Systems
Authors: Chen Fu Long , Zhu Zhao Xia , Fan Xiao Ya
Published: February 2011

In general hardware designers design integrated circuit with hardware description languages or schematic diagram. However the growth of circuit complexity makes circuit design error prone and time consuming. The resulting descriptions tend to be lengthy and hard to reason about. Therefore functional simulation, timing simulation and in-circuit test are three essential steps to ensure that the designed circuit is correct. This paper presents a method of in-circuit verification on FPGA using UART communication between the computer and the FPGA board. Through UART, designers can convert the parallel input vector into a set of serial stimulus signals and send them to the FPGA board, and also can receive the feedback serial signals from the FPGA board and reconvert them into a parallel output vector. Given the input and output ports of the verified circuit component, a verification platform based on UART communication will be customized automatically by the in-circuit verification platform generator. This breaks the constraint of the FPGA board's limited pins and supports wide-scale input/output vectors and can be applied in in-circuit test of digital circuit.
Multimedia Transmission Technology Research Based on Multicasting
Authors: Huang Shao , Wang Shu Rong , Tang Yu Liang
Published: February 2011

The paper studied the basic principles of the RTP/RTCP protocol in real-time transmission of multimedia applications, explained the basic applications of multicast technology in stream transmission and put forward a real-time video transmission system combined with DirectShow technology. Then, it presented the details of the multicast transmission of multimedia files in the process through the RTP protocol.
Design and Implementation of Speech Recognition System Based on SPCE061A
Authors: Wang Shu Rong , Huang Shao , Yuan Fei
Published: February 2011

Based on Sunplus SCM SPCE061A, this paper designs a voice control system which uses speech recognition technology. The results of light emitting diode reaction experiment review that the system can identify more than four orders. Finally, the paper makes a short summary and outlook of voice recognition technology.
Chaos Study on Evolutionary Simulation in Multi-Agent System
Authors: Zhang Wei , Pan Lan
Published: February 2011

Agents' evolutionary behavior in a multi-agent system, which will generate chaotic phenomena, can be used in studying chaos system in natural environment system. The paper simulated the process of belief transfer and bidirectional, innovational transfer among agents, and proposed a new concept of chaotic basic wave and a ZP model. Through some experiments, the paper concluded that the agent group with bidirectional and innovational transfer phenomena could keep the number of their belief types in a steadily chaotic status, and this chaotic steady status will not be affected by some variables of the system in a macroscopic view.
Estimation of Polypropylene Melt Index through the Application of Stacked Neural Networks
Authors: Xia Lu Yue , Pan Hai Tian , Zhou Meng Fei , Cai Yi Jun , Sun Xiao Fang
Published: February 2011

Melt index is the most important parameter in determining the polypropylene grade. Since the lack of proper on-line instruments, its measurement interval and delay are both very long. This makes the quality control quite difficult. A modeling approach based on stacked neural networks is proposed to estimation the polypropylene melt index. Single neural network model generalization capability can be significantly improved by using stacked neural networks model. Proper determination of the stacking weights is essential for good stacked neural networks model performance, so determination of appropriate weights for combining individual networks using the criteria about minimization of sum of absolute prediction error is proposed. Application to real industrial data demonstrates that the polypropylene melt index can be successfully estimated using stacked neural networks. The results obtained demonstrate significant improvements in model accuracy, as a result of using stacked neural networks model, compared to using single neural network model.
The Analysis on the Conditions and its Causes of Sports Ground in Xinjiang
Authors: Zhang Shu
Published: February 2011

The analysis being in progress , result wielding the research method data to fifth time of Xinjiang stadium field general investigation rural area middle and primary school stadium current situation such as field , funds such as document data law , expert interview law , logic grouping law demonstrate the main body of a book: Xinjiang rural area middle and primary school stadium field funds throws into sum quantity deficiency , the especially interior sports house mansion is not worth gravely, stadium field construction funds throws into way unitary, school sports beneficial result is not high. Suggestion: Enlarge investment in Xinjiang rural area middle and primary school stadium field funds , encourage various forms of ownership to invest in rural area middle and primary school sports education cause , plan Xinjiang rural area middle and primary school rationally interior and stadium field layout, is outside same.
Using Grey Prediction Theory to Forecast Expenditure for Science & Technology Activities in China
Authors: Li Wu Wei
Published: February 2011

Based on the statistical data during the period from 2003 to 2008 released by National Bureau of Statistics of China, this paper aims to predict the amount of expenditure for science & technology activities in China by the usage of GM (1,1) model with the six items. The results of this empirical study is that the grey prediction theory can fit the expenditure for science & technology activities amount development trend precisely in China. The accuracy of the prediction result is above 95% and corresponds with a distinction, which the grey theory can meet expectations with small samples or data. Research results show that this GM (1,1) model established in this paper could provide valuable information for policy makers in their efforts to make appropriate technological policies.
Multi-Posture Jumps Analysis with Computational Modelling and Simulation Technology
Authors: Han Jia , Lu Li Ping
Published: February 2011

A computational modeling and simulation method for multi-posture gymnastics jump based on sport biomechanics was improved. Taking tuck jump, pike jump and arched jump as examples, the entire jump phase was seperated into four parts: taking off from bending the knees, airborne, posturing and landing. Then the formulas were developed for modelling. Finally, computational simulation experiment was done with the formulas. The simulation outcomes showed that this method is effective in multi-posture gymnastics jumps analysis.
Robust Control Design and Simulation for Cantilever-Typed Inverted Pendulum
Authors: Zhang Bo , Gu Li Feng
Published: February 2011

In order to solve the problem of the control cantilever-typed inverted pendulum, the second order mathematic model for cantilever-typed inverted pendulum is built in this paper. Using the theory of Linear Robust Optimal Control, the systematic linear robust optimal controller is designed for the stability of this pendulum under the closed loop state. Compared to traditional Linear Quadratic Optimal Control, the final result shows that the robust optimal method has better effects by using Matlab simulation technique.
On Computer Teaching Based on Constructivism Theory
Authors: Hu Li Shuan , Li Ping
Published: February 2011

Constructivism theory is of great significance to the traditional teaching in trying to achieve the broad learning and flexible migration, changing teaching concepts such views on the reform. It puts forward new ideas and methods of teaching. This article analyses drawbacks of the traditional teaching of computer. With the constructivist teaching concept to guide instruction, we discussed the behaviour of computer teaching from the innovation teaching method, situated design and project teaching.
The Research of Information Security Risk Assessment Method Based on AHP
Authors: Xu Ning , Zhao Dong Mei
Published: February 2011

Information security risk assessment is one important part of the security engineering in information system. It has been the focus of the research in the world wide information security fields. This paper designs and realizes a new model of information security risk assessment based on AHP method. In this case, In order to estimate the network security risk by AHP method, firstly should identify the most related factors and establish the threaten identification Hierarchical Model and Vulnerability Identification Hierarchical Model for information security risks. Then, compare every two elements to determine the relative importance of each element. Finally, judge the comprehensive weight for each element. The study of the case shows that the method can be easily used to the risk assessment of the network security. The results are in accord with the reality.
A Design of Wireless Transmission System
Authors: Huang Xiao Yan , Su Wei
Published: February 2011

To design a wireless transmission system for water temperature data detection .This system uses FM as modulation scheme. The launching part adopts MC12017 and MC145152 as PLL, enabling to decrease the carrier frequency error to 1.8×10-4. The carrier frequency modulation is achieved by transfiguration diode HS113 and integrated VCO MC1648. The final stage amplifier adopts triode 2SC2053 with transmission power amounting to 0.245 mw. The receiving part adopts FM receiver chip MC3362 with low consumption and narrowband as main body, analog signals being amplified by LM386. C8051F410 is used as the control chip in the whole system to decode, frequency measure, and display. Experimental tests show that this system consumes lower power, reliable and steady, and is able to correctly transmit and receive data.
Space Targets Detecting Oriented Method of Materials Differentiating
Authors: Xu Shi Xue , Xu Ling Fei , Chen Yan Ru
Published: February 2011

The feasibility of space targets detecting will be widely extended if the properties of the space targets are able to be distinguished based on the optical information as little as possible that means the optical information which is used to identify the space targets is able to be collected by simple optical equipment. Artificial space targets are usually not active emitting objects; therefore, the relative research should be focused on the scattering characteristics of space targets or their material. We have inspected two kinds of materials which are widely used in the manufacturing of space vehicles and we have found similar optical information in the scattered light of the two kinds of materials, as the bio-reflection distribution, the spectrum distribution and so on. However, we have found that the scattered light contains slender polarization ingredient which could be used to distinguish the two kinds of materials after accurate analysis which, obviously, based on the polarization analysis. This kind of analysis method could provide a valuable consultation to the detecting method of space targets.
Modeling Fiber Point Diffraction with Vector Theory for FPDI Design
Authors: Nie Liang , Han Jun , Jiang Xu
Published: February 2011

The fiber point diffraction technology has been used in fiber point diffraction interferometer (FPDI) to measure optical surface with high precision. The wavefront diffracted from the single mode fiber with microns core diameter can be considered as an ideal spherical wave and used as the referenced wave in interferometer. The absolute accuracy of the diffraction wavefront can not be directly measured in experiment. To estimate its quality, the vector diffraction method must be introduced because conventional scalar diffraction theory is unsuitable when the fiber core size is comparable to wavelength. The transfer mode feature which includes single-mode transmission condition and mode field distribution is analyzed at first. Then vector the model of fiber point diffraction is established. Finally, the diffraction wavefront is analyzed with numerical method based on vector theory, and the difference between scalar and vector method is discussed. The results show that vector model can achieve rigorous wavefront analysis for fiber point diffraction and provide important help for PFDI design.
The Research on Moderating Effect of Relationship Benefits in Customer Service Recovery of Sports Medicine: Using Data Mining
Authors: Kong Qing Min , Zhang Ming Li
Published: February 2011

This article introduces the relationship benefits into the research area of customer service recovery of sports medicine. Through data mining, the study has shown that in the sports medicine area, perceived justice have different impact on customer satisfaction and customer loyalty between different relationship benefits customers. For the high relationship benefits customers, distributive justice and interactional justice have significant impact on customer satisfaction and customer loyalty, even if they are dissatisfied, but they will remain loyalty. For the low relationship benefits customers, interactional justice has significant impact on customer satisfaction, and only they remain loyalty when they satisfied. Relationship benefits have the moderating effect in customer service recovery of sports medicine, if customers receive the relationship benefits from sports medicine enterprises, even if the service does not meet their expectations, they would still maintain the relationship with sports medicine enterprises. Our conclusions have the guiding effect for the enterprises, especially for the sports medicine service enterprises.
Modifying Wind Speed Data of Manual Observation Sequence to Automatic Observation Sequence Using a PSO-Based Neural Network
Authors: Xiao Xia , Zuo Hong Chao , Zhang Wen Yu , Wang Ju Jie
Published: February 2011

Recently, manual observation sequence has been gradually replaced by automatic observation sequence. The difference between manual observation sequence and automatic observation sequence is somewhat inevitable. This challenges the the homogeneity and the continuity of historical weather data, and influences atmospheric researches and applications. Therefore, based on the understanding of the influence caused by the two observation sequences, how to modify the data sequence of manual observation to automatic observation sequence has become a problem. In this paper, a model, which is a neural network based on the particle swarm optimization technique (PSONN), is established to modify the wind speed data sequence from manual observation to automatic observation. The proposed model achieves 15.6% in mean absolute percentage error (MAPE) compared to manual observation data sequence. For wind speed, it could be a promising candidate for modifying manual observing data sequence to automatic observing data sequence.
Research on MAC Layer Supporting MESH Model in IEEE 802.16
Authors: Wu Ang , Zhu Juan Hua , Zhu Juan Fang
Published: February 2011

IEEE802.16 standard provides interface protocol of wireless access system for physical (PHY) layer and Medium Access Control (MAC) layer. It supports two kinds of network topology: Point to Multi-point (PMP) and Mesh. This paper descries the MESH model characteristics and how MESH Model was supported in MAC layer by introducing full process of new nodes in Mesh mode accessing network. Furthermore, On the basis of comparing PMP model and MESH mode in MAC-layer structure, function and requirements, it comes to the conclusion: MESH nodes can access network faster and cost less than PMP nodes. Which makes it possible for those areas far away from center base station to establish multi-hop network with less investment and time cost, while coverage is expanded.
Spatial Join Queries Based on QR-Tree
Authors: Yang Ze Xue , Hao Zhong Xiao
Published: February 2011

Spatial join query is a most important query in the spatial database.How to improve the efficiency of a spatial join is a serious question.In this paper,we propose a new algorithm to process spatial join problem.The algorithm is based on the QR-tree,which combines the good property of the R-tree and quadtree.By dividing the space into several subspaces,the algorithm implement the spatial join query on the small R-tree.We compare the algorithm with the R-tree join algorithm of Brinkhoff. Experiments demonstrate the proposed algorithms have high query efficiency.
Study on the Application of COM Method in Motor Imagine
Authors: Li Xiao Bin , Jiang De Rong
Published: February 2011

Brain control the behavior of human, When someone thinks of something, there is thinking movements in someone's brain. Collecting the brain electric wave through Neroscan, Inspecting the feature of the C3、CZ、C4 of Brain electric wave, which apply for the Com Component and analyze the Com principle deeply. Adhibition of control signal to control the virtue of the movement of tractor, At last, Computing the exactitude of control of brain electric wave, The result of experiment is perfect.
An Advanced Algorithm of Multi-Focus Images Fusion Based on Wavelet Transform
Authors: Fan Dong Yan
Published: February 2011

This paper focuses on the multi-focus image fusion based on wavelet transformation, making in-depth discussion and improvement on the existing algorithms from the aspect of the rules of multi-focus image fusion. Especially the parameter of the regional contrast is selected in the algorithm which can reflect better distinct features of the image frequency domain in the high-frequency coefficients fusion. And according to the fusion rule :" the part of the large regional contrast of wavelet high frequencies coefficients corresponding to the clear part of the image " , an improved algorithm is proposed for multi-focus image fusion based on wavelet transform regions contrast. Finally, Matlab is employed to simulation the algorithm.
Contribution Analysis of the Component in the Process of Reliability-Oriented Software Evolution
Authors: Wang Jun , Chen Wei Ru , Jing De Lin , Yang Hong Ji
Published: February 2011

According to the various components will play a different role in the system's reliability evolution, software architecture reliability is analyzed by architecture-based software reliability model in this paper. At the same time, the method of contribution analysis of the component in the process of reliability-oriented software evolution is proposed. The method shows that which component of the overall system plays an important or crucial role in the process of reliability evolution. The efficiency of the software evolution can be improved through contribution analysis of the component in the process of reliability-oriented software evolution.
Optimal Design of Low-Grade Highway Barrier
Authors: Lei Zhi Yi , Zhang Xue Song
Published: February 2011

Aiming at the weak protection capability of current barrier in low-grade highway, an optimized barrier is designed and computed in this paper. The dynamic characteristics of vehicle in traffic accidents are simulated by LS-DYNA, and the performances of intermittent low-grade highway concrete barrier are improved by different shape, size and spacing. The final optimized barrier can orient vehicles and ensure vehicles do not roll or cross the barrier.
With the Advanced Management Concept to Guide Reform of Teaching Content "Petroleum Engineering HSE Risk Management" Master Course Teaching Reform
Authors: Li Wen Hua , Xu Chun Bi , Liu Ju Mei
Published: February 2011

Chongqing Science and Technology University carried out the petroleum engineering security technology of well control technology as the representative teaching and research work, which formed domestic brands and advantages, was recognized by oil companies and Oil University. Petroleum Engineering HSE risk management" is one of the important quality course content. We introduced safety management concepts of DuPont are in the "petroleum engineering HSE Risk Management" course construction, brought "Security Experience Share" into the classroom and strengthened the cooperation of research and teaching, promote the teaching content updates. The application of advanced management concepts effectively promotes the "petroleum engineering HSE risk management" reform of teaching contents.
On the Various Factors that Impact the Effectiveness of Physical Education in Universities
Authors: Yang Ying
Published: February 2011

Physical Education in universities is designed to teach during the school can accept multi-faceted physical education, to develop exercise habits to achieve the goal of lifetime sports. The effectiveness of the current University of Physical Education Teachers by personal factors: features and functions, including physical education teachers, expertise and interests, experience and age, and value orientation of teachers, curriculum, teacher attitudes, beliefs, habits and behavior styles, personality traits; and the enthusiasm of students, attitude, intention; there are school factors, school characteristics, facilities and other factors. These factors plaguing college sports curriculum construction and development, this study intended through the analysis of these factors to find enough of measures to promote Physical Education College further deepening of reform.
Structural Style in Gentle Slope and its Control Action for Sedimentary and Reservoir Formation of Chenjiazhuang Area in Jiyang Depression for Case
Authors: Fan Zhen Feng , Zhang Jin Liang , Liu Xiao Lin , Wang Jin Kai
Published: February 2011

Haft-graben fault basin often have large-scale gentle slope, and the zone of structural style, sedimentary types and forming factor has its unique characteristics. This paper takes Chenjiazhuang area in Jiyang depression for example. By constructing, deposition and accumulation of combining methods Chenjiazhuang area can be divided into three major tectonic units, witch are upliftt zone, slope zone and structural slope-break zone. Different tectonic units develop different sedimentary and reservoir types, and the accumulation controlling factors are also larger differences.
Study and Application of Cemented Carbide Coating Technology
Authors: Chen Yong Zhi , Zan Zhi Ze , Zeng Tie Chu
Published: February 2011

Firstly, the article gives a summarization of current study and research in the area of cemented carbide coating technology. Secondly, the article discusses the mechanism and method of coating technology, and compares the major leading approaches of coating technology. In conclusion, the article introduces the direction of future cemented carbide coating technology, based on current practical applications.
Study on the Complex Strengthening Processes of 5Cr2NiMoVSi Steel Large Hot Forging Dies
Authors: Kuang Jian Xin , Wang Xin Heng , Liu An Min , Zhu Hang Sheng
Published: February 2011

To meet the high requirements of fatigue strength and thermal stability for the large forging dies, the complex strengthening process tests of new high thermal stability die steel 5Cr2NiMoVSi were done. This complex strengthening process was nickel plating the RE boron penetration→ pre-cool quenching → high temperature tempering. The results show that the surface micro-hardness, high temperature oxidation resistance, thermal fatigue resistance and wear resistance of 5Cr2NiMoVSi steel can greatly be improved by these processes. It has achieved significant results for auto front axle large forging dies by using the materials and processing technology.
Friction and Wear Properties of W,Mo,Co Alloyed Layer on T8 Steel by Double-Glow Technique
Authors: Zhang Yan Mei , Jie Xiao Hua , Li Zhong Hou , Xu Zhong
Published: February 2011

In this paper, cobalt, tungsten and molybdenum were co-diffused into the surface of T8 steel by double glow discharge technique. A carbide layer with M6C＋MC was formed on T8 steel. Under the carbide layer was a diffusion layer of W,Mo,Co. Hardness of carbide layer is high over 1200~1400 HV0.025 and can improve to 1400~1600 HV0.025 after solution and ageing treatment. Hardness of the diffusion layer is only 400~550 HV0.025, but it can improve to 800~1000 HV0.025 after solution and ageing treatment. The carbide layer combides with the substrate in metallurgy and can not peel off from the substrate. The carbide layer on T8 steel possess same good tribological properties of M2 steel.
Tribological Performance of TiAl Based Alloy Treated with Plasma Surface Chromizing Process
Authors: He Zhi Yong , Wang Zhen Xia , Wang Ying Qin , Liu Xiao Ping , Xu Zhong
Published: February 2011

TiAl-Cr alloy was prepared on surface of TiAl based alloy by plasma surface alloying technique. The wear resistance of the surface alloy was examined under various wear condition. During the room temperature ball-on-dic sliding test, the TiAl-Cr surface alloy showed reduced friction and improved wear resistance. For the 500°C sliding and room temperature fretting tests, the friction coefficient of TiAl-Cr surface alloy was a little higher than that of TiAl-based alloy, but the wear volume showed significant reducing, the wear resistance was improved obviously. The addition of chromium increases the strength and hardness of the TiAl-based alloy, and therefore the load bearing and anti-adhesion capacity of the surface were also enhanced, these were the main mechanisms for the improvement of wear resistance.
The Influence of Plating Temperature on the Properties of Electroless Ni-Cu-P Alloys on Aluminum
Authors: Wang Xi Ran , Lu Hui , Zhang Ying Wei , Hu Xin Gang , Wu Jing
Published: February 2011

In this work, the effect of plating temperature on the electroless plating rate and the properties of the electroless Ni-Cu-P deposits was studied. The corrosion resistance, hardness, surface morphology and components of the coating were studied by using electrochemical workstation, digital micro-hardness SEM and EDS. The results show that the optimum plating temperature is 75°C. The deposition rate, hardness and corrosion resistance are all good when the optimal temperature is 75°C. The adhesion between the deposits and the matrix is better. The deposits is smooth and uniformity, smooth by SEM. The deposit contains Ni 77.80%, Cu 7.68%, P 14.52% by the analyses of energy disperse X-ray.
Properties of Ceramic Coatings on the Wall of Coke Oven
Authors: Liu Shu Xian , Shen Li Li , Wang Qian Ping
Published: February 2011

Flame sprayed ceramic coatings on the wall of coke oven are characterized before and after melting. The attempt has been made to investigate thermal shock resistant, carbon deposit resistant, wear resistant of the coated and melted samples. The techniques used are SEM and XRD. The results show that: 1) Presence of quartz, corundum and mullite are identified in the surface of the coated specimen. Good adhesion between the coating and the substrate is caused by presence of quartz which is the same content as the substrate.2) The thermal shock resistance cycles of the coating samples are 15 ~ 30 times, but uncoated samples are only 1~2 times. The main reason is that he coating–substrate interface shows no gaps or cracks, and it has a characteristic feature of good adhesion between the coating and the substrate. 3) The wear resistance of the coated samples are better than that of the uncoated samples because glass-coating is more smooth than the uncoated specimen and the mullite and corundum in the coating have the high hardness value that makes the hardness of the coating increased.
Research on Random Stress Spectrum for Cumulative Fatigue of Crane Metal Structure
Authors: Wang Ai Hong , Xu Ge Ning , Yang Ping , Gao You Shan
Published: February 2011

In order to calculate the fatigue life, lifting or unloading position, lifting weight and load mobile line of crane with automatic acquisition device were recorded on spot. Probability distribution model and its characteristic parameters of lifting weight and lifting or unloading position were analyzed with goodness of fit test. The random samples of the load spectrum parameters for the cumulative fatigue were also calculated with Latin Hypercube Sampling. Dynamic simulation model of crane metal structure was formed. Dynamic load function that dynamic load changed with time was also established, from which the stress spectrum through structural dynamics analysis in fatigue calculation point was acquired. Based on then above calculation, the remaining fatigue life of the prototype is 38 years.
Effect of Molecular Weight on Phase Diagram of Epoxy/Polyetherimide-Siloxane Blends
Authors: Li Xiao Yan , Gan Wen Jun , Ren Yuan , Xi Zheng , Tang Ye Wen , Gu Sheng Jie
Published: February 2011

The cloud points of blends epoxy/polyetherimide-siloxane (PEI-Siloxane) without or with curing agent methyl tetrahydrophthalic anhydride (Me-THPA) after different curing time (1min, 2min, 3min) at 150oC were determined by optical microscope. The cloud point curve for uncured and cured after different time was then obtained from the experimental results with different composition. The effects of molecular weight of epoxy on phase diagram were discussed. The miscibility of blends will be taken into account in the toughing of epoxy resins by thermoplastic PEI-Siloxane copolymer later.
Study on the Effect of Ultrasonic Waves on the Low Temperature Electroless Ni-P Plating on Copper Substrate
Authors: Hu Yong Jun , Hu Guang Hui , Cheng Xiao Ling , Xiao Xiao Ting , Zhang Hai Yan , Li Feng , Xu Qing Song
Published: February 2011

In this paper，electroless Ni-P plating on copper substrate at 50 °C in ultrasonic field was carried out. The frequency of ultrasonic waves was 40 kHz. The effect of ultrasonic on the composition, plating rate and morphology of Ni-P deposite was investigated at the ultrasonic power of 40, 70 and 100 W. The experimental results showed Ni-P deposit could not be obtained without ultrasonic field at 50 °C. The content of nickel and the thickness of Ni-P deposit increased with the ultrasonic waves power increase. Ultrasonic irradiation power remarkably refines the nodule size of Ni-P particles. The collapse of cavities in solution seems to suppress the Z-direction growth of the nodule.
Impact Abrasive Wear Resistance of High-Chromium Cast Iron Bars Reinforced Hadfield Steel Matrix Composite
Authors: Niu Li Bin , Sun Wang Chang , Hojamberdiev Mirabbos
Published: February 2011

Hadfield steel matrix composite, reinforced by high-chromium (Cr) cast iron bars, was fabricated by inserting high-Cr alloy flux-cored welding wires into Hadfield steel molten at 1500 °C. The characteristics for water-quenched composite were investigated and compared with those of reference Hadfield steel. The results show that flux-cored welding wires could be melted by heat capacity of Hadﬁeld steel molten and transformed into high-Cr cast iron bar reinforcements after solidification. The reinforcements of water-quenched composite consist of martensite, eutectic M7C3 carbides and residual austenite. With the increasing of impact energy, the impact wear rate of the composite firstly decreases, and then increases slightly, therefore, the composite is more available to the conditions of low and medium impact energy. The reason is it can combine fully advantages of the outstanding toughness of Hadfield steel, and high hardness of high-Cr cast iron.
Flame Retardant Polyamide 6 Composites Using NMH or NMH/MCA/APP
Authors: Shen Yan , Wen Shao Guo , Wang Ji Hu , Liu Hong Bo , Qi Hai Liang , Xu Qian , Hu Wei Wei
Published: February 2011

In this paper, flame retardant Polyamide 6 (PA6) composites were prepared by nano-magnesium hydroxide (NMH) or its composites with melamine cyanurate(MCA) and ammonium polyphosphate(APP). Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to analyze the structure of nano-magnesium hydroxide. The properties including tensile properties, molten index (MFI), rockwell hardness and density of flame retardant PA6 were analyzed. Orthogonal experiments were used to study flame retardancy of PA6 with NMH, MCA and APP. The results showed NMH had hexagonal orthorhombic crystal structure with size of 300×200×100nm. Density of polyamide 6 showed an upward trend when the content of NMH was increasing, the mechanical properties and hardness changed little while processing performance serious declined. The flame retardance of nitrogen-phosphorus -inorganic flame retardants was not desirable.
Research on Mechanism of Polymer Inhibiting Secondary Reaction in Clinker Leaching Process
Authors: Yu Hai Yan , Gao Bo , Hao Yi , Wang Bo , Li Guang Zhu , Bi Shi Wen
Published: February 2011

In this paper, the mechanism of polymer inhibiting secondary reaction in clinker leaching process was studied by IR spectrum of leaching residue obtained from the reaction of dicalcium silicate with sodium aluminate solution and the adsorption law of polymer AY and PEG on the surface of dicalcium silicate. The results indicated that the main adsorption mode of polymer AY and PEG were chemisorptions and physical adsorption respectively. The mechanism of decreasing the occurrence of secondary reaction is encapsulating surface of dicalcium silicate by AY and PEG. The adsorption mode of polymer AY on dicalcium silicate particles was single molecule adsorption and its adsorption isotherm was the typical “L” type. It accorded with Langmuin equation, and the adsorption free energy EAY was 57.89kJ.mol-1. The adsorption mode of polymer PEG on dicalcium silicate particles was multimolecular adsorption and its adsorption isotherm was the typical “S” type. It accorded with Freundlich equation and the adsorption free energy EPEG was 1.63kJ.mol-1.
Investigation of the Effects of Dielectric Inlet Pressure in Inner Jetted Dielectric EDM Milling
Authors: Wang Yan Qing , Bai Ji Cheng , Guo Yong Feng , Huang He
Published: February 2011

In layer-by-layer EDM milling based on inner jetted dielectric, the dielectric inlet pressure is an important process parameter and has great influence on the machining characteristics. So, numerical simulation of the liquid-solid two-phase flow field in discharge gap is conducted. The simulation results of debris concentration reveal that the debris can be evacuated from the discharge gap in time, which increases the machining process stabilization and improves the machining efficiency. Finally, the effect of dielectric inlet pressure on material removal rate (MRR) and tool wear ratio (TWR) were also researched and discussed. The optimum inlet pressure, which maximized the MRR and minimized the TWR, was found through experiment.
Study on Micro-Arc Oxidation Composite Ceramic Coating Properties in the Textile Machinery Spare Parts
Authors: Chang Jiang , Zhao Hong
Published: February 2011

This article uses independently develops micro-oxidation installment, systematically studied and optimized the silicate system solution,the silicate and the different recombiner composition compound system solution that are used in SJDM-1 rare earth magnesium alloys micro-oxidation and different electrical parameters that affect corrosion resistance of ceramic coating through the condition experiment and the orthogonal experiment.Using scanning electron microscopy (SEM) , X-ray diffraction (XRD) , coat thickness tester and drip experiment, the surface morphology of ceramic layer of SJDM-1 rare earth magnesium alloys are observed,and composition, thickness and corrosion resistance of SJDM-1 rare earth magnesium alloys in different solution are tested. Meanwhile combining the micro-oxidation solution and electrical parameters that are optimized, the difference of corrosion resistance between the hydration seals hole and solvent seals hole are compared after micro-oxidation. In addition, corrosion resistance of MAO ceramic layers between the two different materials RE magnesium alloys (casting SJDM-1, deformation SJDM-2)under the same conditions. Finally, micro-oxidation solution failure and the process of the ceramic layer corrosion are analysed. Mechanism of the discharge breakdown that influence the corrosion resistance of the micro-oxidation ceramic coating is explored, come to the internal and external factors that affect corrosion resistance of the micro-oxidation ceramic layer.
Process, Microstructure and Properties of Plasma-Sprayed Ceramic Coating on AZ91D Magnesium Alloy
Authors: Lu Sheng , Chen Yan , Chen Jing , Fu Li
Published: February 2011

Plasma spraying process was carried out to prepare Al2O3+13%TiO2 ceramic coating on AZ9Subscript text1D magnesium alloy by an orthogonal experiment. The microstructural characteristics and properties of coating were investigated. The results reveal that the bonding strength of optimized Al2O3+13%TiO2 coating reach 19.54MPa. The thermal shock failure of the coating is mainly due to fatigue under thermal cycling stress. The corrosion resistance of magnesium alloy is remarkably improved by plasma-sprayed Al2O3+13%TiO2 coating.
Tribology of Plasma Sprayed Al2O3-13%TiO2 on AZ91D Magnesium Alloy
Authors: Lu Sheng , Weng Zhi Ping , Chen Jing , Fu Li
Published: February 2011

The microstructure and properties of plasma sprayed Al2O3-13wt%TiO2(AT13) coating on AZ91D magnesium substrate were investigated. The results indicated that the AT13 coatings consisted of γ-Al2O3, α-Al2O3and Al2TiO5, presented a lamellar structure with pores and microcracks. The microhardness increased from the substrate to the coating, significantly conformed to Normal and Weibull distributions. The friction coefficient of AT13 coating increases with the increase of time, load and rotation speed under lower working condition (10N, 20N;100r/min,150r/min), but abnormal phenomenon appeared under high load and rotational speed.
Study on Milling Gray Cast Iron Using PCBN Indexable Face Milling Tools
Authors: Shen Hui Cun , Zong Wan Shuan , Liang Ji Feng
Published: February 2011

Under dry cutting conditions, multi-factor orthogonal experiment test method is adopted to carry out experiment of milling gray cast iron HT200 using PCBN indexable face milling tool. Milling force empirical formula model is established by means of least-square method and regression analysis. Significance test of regression equation and regression coefficient prove that the reliability of the established model is high. Test results show among three milling forces, the biggest one is tangential force Fz, the smallest one is radial force Fy, whereas value of axial force Fx is between Fz and Fy. Through analyzing experiment results, relationship of milling parameters influence on milling force is summarized. Recommendation of milling parameter value range is put forward.template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text.
Experimental Research on the Sound Insulation Property of Lightweight Composite Paper Honeycomb Core Wallboard
Authors: Miao Xin Le , Yao Yong , Wang Yu , Chu Yun Peng
Published: February 2011

lightweight composite paper honeycomb core wallboard as green building materials and low carbon product of modern life, its lightweight and energy saving, environmental protection, easy construction which other wallboards can't reach, but in actual use, the residents reflects its sound insulation performance is not very well, The lightweight composite paper honeycomb core wallboardand is composite with two rigid panel and paper honeycomb core which is in the middle of the wallboard. However, at present, people rarely Study on Sound Insulation Property of lightweight composite paper honeycomb core wallboard, so take the lightweight composite paper honeycomb core wallboard as the research object, through several sets of Different Specifications wallboard of experiment test,, the results showed that:The sound isolation property of calcium silicate panel is better than Gesso panel’s. The thick panel’s sound isolation property is better than the thin one. At the same thickness, the more layers of paper honeycomb core, the better sound isolation effect. Increase the layer number of paper honeycomb core has remarkable effect on sound isolation property.
Preparation of Wood-Based EMI Shielding Composite via a Short Process Electroless Plating
Authors: Wang Li Juan , Li Jian
Published: February 2011

A short electroless Ni-P plating process for preparing EMI shielding wood-based composite was studied. Birch and Fraxnus madshurica veneers were used as the substrate. It is a simple method that Ni-P coating was easily deposited on the surface of two kinds of veneers. The plated specimens were observed by SEM that the films are uniform, compact and continuous. EDS results shows that the coating contains 4wt% phosphorus and 96wt% nickel. It is indicated by XRD analysis that the film on the two kinds of veneers are crystalline. It was measured that the two wood-based composites have better electromagnetic shielding performance if more than 60dB in the frequency ranges from 9k to 1.5GHz.