bluuebunny/crossref_metadata_2025 huggingface dataset:
Assessment of Human Islet Labeling with Clinical Grade Iron Nanoparticles Prior to Transplantation for Graft Monitoring by MRI
Authors: Ris Frederic , Lepetit-Coiffe Matthieu , Meda Paolo , Crowe Lindsey A. , Toso Christian , Armanet Mathieu , Niclauss Nadja , Parnaud Géraldine , Giovannoni Laurianne , Bosco Domenico , Morel Philippe , Vallee Jean-Paul , Berney Thierry
Published: February 2011

Ex vivo labeling of islets with superparamagnetic iron oxide (SPIO) nanoparticles allows posttransplant MRI imaging of the graft. In the present study, we compare two clinical grade SPIOs (ferucarbotran and ferumoxide) in terms of toxicity, islet cellular uptake, and MRI imaging. Human islets (80–90% purity) were incubated for 24 h with various concentrations of SPIOs (14–280 μg/ml of iron). Static incubations were performed, comparing insulin response to basal (2.8 mM) or high glucose stimulation (16.7 mM), with or without cAMP stimulation. Insulin and Perl's (assessment of iron content) staining were performed. Electronic microscopy analysis was performed. Labeled islets were used for in vitro or in vivo imaging in MRI 1.5T. Liver section after organ removal was performed in the same plane as MRI imaging to get a correlation between histology and radiology. Postlabeling islet viability (80 ± 10%) and function (in vitro static incubation and in vivo engraftment of human islets in nude mice) were similar in both groups. Iron uptake assessed by electron microscopy showed iron inclusions within the islets with ferucarbotran, but not with ferumoxide. MRI imaging (1.5T) of phantoms and of human islets transplanted in rats, demonstrated a strong signal with ferucarbotran, but only a weak signal with ferumoxide. Signal persisted for >8 weeks in the absence of rejection. An excellent correlation was observed between radiologic images and histology. The hepatic clearance of intraportally injected ferucarbotran was faster than that of ferumoxide, generating less background. A rapid signal decrease was observed in rejecting xenogeneic islets. According to the present data, ferucarbotran is the most appropriate of available clinical grade SPIOs for human islet imaging.
The role of evolutionary processes in producing biodiversity patterns, and the interrelationships between taxonomic, functional and phylogenetic biodiversity
Authors: Swenson Nathan G.
Published: February 2011

Patterns of biodiversity are ultimately the product of speciation and extinction. Speciation serves as the biodiversity pump while extinction serves as the agent that culls global to local levels of biodiversity. Linking these central processes to global and local patterns of biodiversity is a key challenge in both ecology and evolution. This challenge necessarily requires a simultaneous consideration of the species, phylogenetic, and functional diversity across space and the tree of life. In this review, I outline a research framework for biodiversity science that considers the evolutionary and ecological processes that generate and cull levels of biodiversity and that influence the inter‐relationships between species, phylogenetic, and functional diversity. I argue that a biodiversity synthesis must begin with a consideration of the inherently ecological process of speciation and end with how global biodiversity is filtered into local‐scale plant communities. The review ends with a brief outlook on future challenges for those studying biodiversity, including outstanding hypotheses that need testing and key data limitations.
Pas d'action publique autonome sans instruments propres
Authors: Halpern Charlotte , Le Galès Patrick
Published: February 2011

Résumé Dans quelle mesure l’analyse des formes d’instrumentation, c’est-à-dire du choix et de la combinaison d’instruments, expliquet-elle l’émergence et le développement d’une action publique autonome ? L’entrée par les instruments apporte-elle un éclairage fécond sur l’évolution des formes de pilotage de l’action publique privilégiées au sein de l’Union européenne ? À partir d’une analyse comparée et systématique des instruments des politiques européennes environnementales et urbaines entre 1972 et 2006, cet article s’interroge sur la relation entre les formes d’instrumentation de l’action publique européenne et la gouvernance de l’Union européenne. À travers l’analyse de deux cas contrastés, l’article montre dans quelle mesure, à travers quels mécanismes et avec quels effets, les instruments ont structuré les transformations de l’action publique européenne sur la moyenne durée.
FLOW PATTERNS AND HEMODYNAMIC EFFICACY ANALYSIS IN A NOVEL PERCUTANEOUS STENTED AORTIC VALVE
Authors: Kumar Gideon Praveen , Mathew Lazar
Published: February 2011

Recently, percutaneous valve replacement has emerged as an alternative treatment for stenosis of mitral, aortic, and pulmonary valves, replacing the surgical approach and providing a new perspective on transcatheter placement of cardiac valves. The conventional open heart surgery does not suit most of the cardiothoracic patient population for various reasons. Percutaneous valve replacement has started becoming the first choice for surgical replacement of the cardiac valves. Under such a scenario where good potent porcine valves made from the pericardium of pigs are being made available, the real question is designing and developing cost effective stents to bear these valves. The ones that are imported are highly expensive which cannot be afforded by some of the Indian population. This also has substantial benefits from the standpoints of health, safety, and cost. The manufacturing of a stented aortic valve is an absolutely critical job, which requires proper designs, finite element analysis, and flow dynamics studies. This paper forms the base for an eventual manufacture of stented aortic valves, giving in-depth details pertaining to design and implantation of the bioprosthesis in the aorta with flow pattern analysis postimplantation and its hemodynamic efficacy analysis. Blood flow analysis and associated hemodynamic analysis help to understand the leakage resistance of the stented valve. A valve of this kind will enable minimal invasive cardiac surgeons to perform percutaneous aortic valve replacement with ease. This would also be an economic procedure allaying the high costs that are typically involved in conventional open heart surgery. We believe that this model has great potential for helping to set up a protocol for the growing of a tissue engineered heart valve construct.
Study on Direct-Driven Wind Power System Control Strategy
Authors: Li Jian Lin , Liang Liang
Published: February 2011

The development of direct-driven wind power system using permanent magnet synchronous generator (PMSG) is very fast, and the back-to-back converter has been paid much attention for its excellent performance. The work principle of the generator-side converter (GSC) and control strategy of PMSG are explained in detail, and the steady-state and dynamic performances are analyzed by simulation. The experimental prototype is built to achieve generation and motor state operation, and the vector control of PMSG is realized by generator-side converter. The simulation and experiment results show that using PWM converter as generator-side converter for direct-driven wind power system with PMSG, can achieve good control performance for PMSG and provide possibility to supply excellent power energy transmitted to power grid.
Research on Non-Physical Simulation Methods of Sub-Object in Trampoline Simulation
Authors: Zhu Li Jin
Published: February 2011

In trampoline, in order to achieve rapid and stable motion with strong sense of immersion, the simulation of trampoline is needed, and this simulation of sub-object requires to be achieved according to instance data of human motion based on collision detection concept. This paper mainly focuses on collision detection between moving human body and trampoline, and the non-physical simulation methods of trampoline. Then, it analyzes the effectiveness and stability of these methods in order to provide some advices for the simulation of trampoline and other sports.
Danger Theory Based Model for Network Security Risk Assessment
Authors: Sun Fei Xian
Published: February 2011

Inspired by the principles of immunity, a danger theory based model for network security risk assessment is proposed. After introducing the principle of the danger theory and with the improved concepts and formal definitions presented, the model architecture is described. And then, the methods of network intrusion detection and security risk assessment are given. Theoretical analysis and simu-lation results show that the proposed model can evaluate the network attack in real-time. Thus, it provides an effective risk assessment solution to network security.
Video Watermarking Based on Cloud Model and Geometric Moment
Authors: Xu Guo Juan , Li Jian Jie , Lv Jin Hai
Published: February 2011

A video watermarking scheme based on geometric moment corrected is proposed. This algorithm used the geometric moment’s good characteristic of corrected parameters of scaling attack, and combined with the randomness and fuzziness of Cloud model. In watermarking forming process we use the Cloud model. In detection process, first corrected the detected video sequence parameters of possible scaling attack by using geometric moment, and then extracted watermark from corrected video sequence. The experimental results show the robustness to lossy compression, filtering, frame dropping, additive noise, scaling and translation attacks.
The Competition Characteristics Research of Net-Partition Oppositional Group-Event Sports
Authors: Gao Ping , Hu Yi Hai , Yu Yin , Jin Zhu Fan
Published: February 2011

the study has taken net-partition oppositional group-event sports hierarchy elements as research platform, and has calculated the four-level elements’ relative weight of net-partition oppositional group-event sports structure hierarchy by using the AHP analyze method and examine the subjective consistency of weight evaluation with consistency factors, then analyze the group-event competition characteristics combined with elements weight.
Numerical Simulation of Characteristics of Cross-Flow Heat Transfer in Pulsating Flow
Authors: Li Guo Neng
Published: February 2011

In order to investigate the characteristics of heat transfer in oscillating flow, the computational fluid dynamics method was employed to study the effects of pulsating flow on the heat transfer process in a cross-flow heat exchange pipe, and to analyze the underling mechanism which controls the improvement of heat transfer in pulsating flow through the distribution of temperature. Several pulsating frequencies (f=0, 5, 10, 50, 100, 150 Hz) and a wide range of pulsating amplitudes (inlet velocity u=2.0+Asin(2πft) m/s, A=0, 2, 5, 10, 15, 20 m/s) were explored to find out the best pulsating parameters for heat transfer. Results showed that pulsating flow with a low pulsating frequency (the magnitude of ~101 Hz) should be selected to obtain large heat transfer coefficient, and that pulsating flow with larger pulsating amplitude results in greater heat transfer coefficient. On the other hand, results revealed that only a limited length of the cross-flow exchange pipe was affected by the pulsating flow compared to the whole length, and that the affected length is longer with lower pulsating frequency and larger pulsating amplitude.
Research and Application of Wavelet Neural Networks of Particle Swarm Optimization Algorithm in the Performance Prediction of Centrifugal Compressor
Authors: Huang Sheng Zhong
Published: February 2011

The traditional method of centrifugal compressor performance prediction is usually the BP neural network, however, the problems are that prediction accuracy is not high enough, convergence is slow and it is apt to fall into local optimal solution. In order to predict the performance of centrifugal compressors more accurately and identify the implicit problems in advance, now we combine the particle swarm optimization, wavelet theory and neural networks, to establish performance prediction model of centrifugal compressor based on wavelet neural network of PSO. First, set the various parameters of wavelet neural network as the particle position vector X and the energy function of mean square error as the optimized objective function. By particle swarm optimization algorithm to iterate the basic formula to obtain the corresponding WNN coefficient and then use back-propagation algorithm to train WNN to approach any nonlinear function. Simulation results show that application of the prediction model can achieve the accurate prediction of performance and monitoring of centrifugal compressor. The prediction model has the advantages of simple algorithm, stable structure, fast calculation of convergence speed and strong generalization ability with a prediction accuracy of 99%, 13% higher than prediction accuracy of traditional methods, which has a certain theoretical research value and practical value.
Building the AHP-Based Teaching Ability System for Martial Arts Teachers in Institutions of Higher Learning
Authors: Dong Hui Fang
Published: February 2011

This study builds with AHP (Analytic Hierarchy Process) the teaching ability system for martial arts teachers in institutions of higher learning, which falls into four layers: destination layer, criteria layer, feature layer and index layer. The destination layer refers to the teaching abilities of martial arts teachers; the criteria layer consists of two criterions, which are professional practice ability and teaching ability; the feature layer is made up of seven features, including martial arts skills, martial arts organization and judgment, martial arts culture, martial arts graph recognition and routine design, basic quality, basic skill and teaching organization; and the index layer consists of 19 indexes, which are self-defense skills, routine exercise skills, offensive and defensive skills, martial arts organization, martial arts judgment, schools of martial arts, martial arts culture, martial arts graph recognition, martial arts routine design, professional ethics, teamwork, humanistic quality, language expression, student management, teaching research, course design, teaching practice, teaching evaluation and teaching guide. The results show that the top five impact factors for the teaching ability of martial arts teachers in institutions of higher learning are course design, routine exercise skills, teaching practice, teaching research and martial arts routine design.
A Method of Improved Support Vector Machine for Network Security Situation Forecasting
Authors: Li Yuan Cheng , Jing Jing Tao
Published: February 2011

Aiming at the problem that parameters of Support Vector Machines (SVM) are very difficult to confirm, this paper points out a parameter selection method for SVM based on Particle Swarm Optimization (PSO), which can make the SVM more scientific and reasonable in parameters selection; and thus enhance the forecast accuracy of the network security situation. The Simulation results show that the optimized SVR forecast model has good forecast accuracy for the network security situation, and present the future changing at a macro level, then help the network managers control network.
Geometric Algebra Neuron for SAR Automation Target Recognition
Authors: Cao Wen Ming , Li Xiong Feng , Pu Li Juan
Published: February 2011

Biometric Pattern Recognition aim at finding the best coverage of per kind of sample’s distribution in the feature space. This paper employed geometric algebra to determine local continuum (connected) direction and connected path of same kind of target of SAR images of the complex geometrical body in high dimensional space. We researched the property of the GA Neuron of the coverage body in high dimensional space and studied a kind of SAR ATR(SAR automatic target recognition) technique which works with small data amount and result to high recognizing rate. Finally, we verified our algorithm with MSTAR (Moving and Stationary Target Acquisition and Recognition) [1] data set.
Computational Intelligence Based Material Design and Optimization
Authors: Liu Yu , Fang Jing , Xu Yuan
Published: February 2011

Forward modeling is to model structural performance and optimize the relationship among material composition, process, and performance, and predict performance according to material composition and process prediction. Reverse optimization, an important research topic in material science and engineering, is to design composition and processes according to pre-performance design. Computational intelligence technique, a new point and interdisciplinary research focus, provides a new way to predict material properties. In this paper, we review and summarize methods of material design based on computational intelligence technique. As we know, establishing models of material data can optimize material composition and production processes, reduce testing cases and cost, and improve performance. This article also points out advantages, disadvantages and the future direction in the field of material design based on computational intelligence technique.
Security Policy of Data in Enterprise Data Trusteeship Database
Authors: Jiang Hua , Wen Jing
Published: February 2011

As the low maintenance cost of data trusteeship, more and more medium-size and small size enterprises choose data trusteeship service. Data is valuable fortune of enterprise, security of enterprise data must be guaranteed in the condition of together using a same host. Data security includes data transmission security, data storage security and confidentiality security. The paper discusses the security problem and coping strategy of database data in a data trusteeship environment. Two-phase sub-keys encryption algorithm is used to encrypt the data and also analysis its usability and security. The realized method is further presented. The algorithm solves the data security problem of database in a data trusteeship environment effectively and further enhances the security of database data.
The Relationship between “Compulsory Teaching Method” and “Joyful Sport”
Authors: Wang Jian Hui , Yang Yang
Published: February 2011

With the widespread trend of the educational idea “joyful sports” implemented in colleges, this paper analyzes the teaching process of “joyful sports” thoroughly and summarizes the existing problems of it basing on the practical teaching experience. Furthermore, this paper concludes that compulsory teaching method is the foundation of “joyful sports”. The educational idea of “joyful sports” can not be fully realized without the participation of compulsory teaching method.
Critical Problems in Validation Process of Simulation Models
Authors: Shi Peng , Liu Fei , Yang Ming
Published: February 2011

Simulation models are increasingly being used to solve more and more complex problems and to aid in decision-making. To provide a realistic and confident simulation environment for users, simulation models have become key components in military simulations. This paper discusses the modeling nature of simulation models, and then the modified validation criteria for measuring the agreements between Subject Matter Experts and simulation models are presented. Furthermore, validation methods such as graphical comparison, feature analysis, face validation, confidence interval and hypothesis tests of three types errors, are discussed according to the validation metrics of simulation models. Simulation models could be validated based on the proposed validation process effectively. The proposed process could be applied to the simulation systems and solve many VV&A difficulties. Example of the mass moment missile, illustrates the validity of the proposed process.
Design and Implementation of M-Learning Platform Based on 3G Mobile Network
Authors: Hu Jing De , Gong Cheng
Published: February 2011

China has already entered into the 3G era and the introduction of 3G mobile communication technology makes the mobile learning becoming an important way of learning. It makes up the limitations of distance education currently exists in the realization of life-long education through changing the form of the network education by Mobile learning resources. This paper is given relevant design and implementation of Mobile learning platform by introducing the widget technology of NOKIA S60 platform combined with needs analysis of modern mobile education.
Patent Classification Using Hybrid Classifier Systems
Authors: Liu Su Houn , Liao Hsiu Li , Pi Shih Ming , Kao Chih Chiang
Published: February 2011

Patents are distributed through hundreds of collections, divided up by general area. A hybrid classifier system thus can be a powerful solution to difficult patent classification problems. In this study, we present a system for classifying patent documents on a hybrid approach by combining multiple text classifiers (Naïve Bayes, KNN and Rocchio). Decisions made by various text classifiers can be combined by voting and sampling mechanisms in the system. A prototype system was developed and tested in a real world task. The results have indicated that the accuracy of the hybrid approach is more stable than that of any of the three individual text classifiers.
Nonlinear Analysis of Traffic Flow for a Lattice Model in an Intelligent Transportation Environment
Authors: Li Zhi Peng , Zhang Shan Shan , Li Xing Li , Liu Fu Qiang
Published: February 2011

In this paper, the lattice model which depends not only on the difference of the optimal current and the local current but also on the relative currents is presented and analyzed in detail. From the nonlinear analysis to the extended models, the relative currents dependence of the propagating kink solutions for traffic jam are obtained by deriving the modified KdV equation near the critical point by using the reductive perturbation method.
Study on Match Strategy in Badminton Group Competition
Authors: Song Ai Ling , Chen Kai , Liu Xu
Published: February 2011

Scientific rational match strategy matters the result of badminton group competition, on which in-depth research has important theoretical and practical value. In this paper, a program for investigation on match strategy in badminton group competition is presented. It can provide important theoretical reference for coaches in match strategy training and its plan. And its further application can be used for quantitative analysis of atheletes’ psychological pressure in competition.
Some Properties of Symplectic Manifolds S on the Projective Tangent Bundle PTM
Authors: He Yong , Lu Xiao Ying , Lu Wei Na
Published: February 2011

In this paper, we show the relationship between 2-form of the two projective tangent bundle and the relationship between 2-form on projective tangent bundle and 1-form on by using the theory of fiber bundle and the properties of symplectic manifold of the projective tangent bundle . Moreover, we derived a simpler formula of Lie derivative of a special vector field, which is on the projective tangent bundle.
Research on Relationship between Industrial Characteristics and Innovation Capability: Evidence from Chinese High-Tech Industries
Authors: Li Wu Wei
Published: February 2011

For the studies on the innovation capability, there are many limitations in using traditional statistical techniques. The grey system theory proposed in this paper is to supplement the limitations of using traditional techniques and it is more suitable to figure out the relationship between industrial characteristics and innovation capability within Chinese high-tech industries. Based on the statistical data from Chinese high-tech industries, over the period 2006-2008, this paper used fifteen indicators affecting the innovation capability and seven indicators related to industrial characteristics. Firstly, this paper applied grey relational analysis to find the significant factors and other indicators affecting innovation capability within Chinese high-tech industries. Secondly, it applied grey decision-making method to arrange the innovation capability of Chinese high-tech industries in order. Finally, this paper used GM (0,N) model to analyze the relationship between the seven variables of industrial characteristics and innovation capability within Chinese high-tech industries as the results.
Three Important Quarantine Diseases of Artificial Pine Forests and their Controls
Authors: Tan Yi Min
Published: February 2011

The pine tree is an important tree species in China. In recent years, in order to quickly obtain a lot of woods and higher economic benefits, a large area of artificial pine forests is created in different places, coupled with the productivity decline of our country’s artificial pine forests and the formation of fragile forest ecosystems, which lead to serious plant diseases and insect pests. Some quarantine diseases spread quickly, causing huge losses to the production of artificial pine forests. This paper provides an overview of pathogennies, symptoms, occurrence situations of three important quarantine diseases of artificial pine forests occurring in Hunan province, and proposes control measures, which provide references for taking further effective measures to control artificial pine forest diseases.
Psychological Characteristics of Cognition of Environmental Sculpture Information
Authors: Yang He
Published: February 2011

As an integral element of the space environment, the environmental sculpture plays an important role in the decoration of space environment, the expression of urban culture and reflection of the city's character, etc. Environmental sculpture is a visible symbol independent and outside of the sign of nature or architectural language, which has become an important cultural carrier between the communication of environment and people. From the perspective of cognitive science, this paper analyzes the relationship between people, environment and environmental sculpture to explore the psychological characteristics of cognition of environmental sculpture and examines, analyzes and interprets the phenomenon of environmental sculpture from the cognitive psychology perspective, which brings some enlightenment for the design of environment sculpture.
Three Dimensional Numerical Simulation of Rock Core Discing Based on Strain Soft Model
Authors: Jiang An Nan , Zeng Zheng Wen
Published: February 2011

Aiming at the complexity of rock discing mechanics, and the theory being not mature, the paper carried out three-dimensional numerical simulation for rock core discing based on strain soft model. The strain soft theory is introduced firstly, then numerically simulated how the depth of lug boss and original stress affect the rock core destroy pattern(discing if occurs, the thickness of disk), obtained the characters of rock core discing. Along with the drilling depth increases, the stress concentration scope below lug boss also increases, as well as the pressure stress concentration degree of side corner below of lug boss. Rock core discing can be induced respectively by shear action and tension action, sometimes it is combined by both of them. The destroy pattern of them especially destroy sequence are different. The strain soft numerical simulation could be used in original stress feedback analysis, has significant meaning.
A New Urban Fire Remote Monitoring System
Authors: Zhang Zhi Qin
Published: February 2011

The fire remote network monitoring technology based on modern communication and network transmission technology can ensure that the fire alarm system and fire safety facilities play their due roles. We use CAN bus to acquire distributed data of remote fire information for its characteristics of distributed control and its advantages of data transmission, and then use the embedded gateway to Connect CAN and an Ethernet LAN or the Internet seamlessly.
Spectrum Detection for Cognitive Radio Based on Auto-Adaptive Threshold
Authors: Chen Li Na , Miao Chun Yu
Published: February 2011

This paper proposed a cooperative spectrum sensing scheme based on auto-adaptive threshold in multi-user cognitive radio network, which can improve detection performance of cognitive user. According to closed-form expressions of detection probability, we compared the noncooperative scheme with the multi-user cooperative scheme, and compared the auto-adaptive threshold with fixed threshold in terms of detection probability through imitation. Result shown that the detection probability of multi-user cooperative detection is improved greatly compared to traditional noncooperative detection, and auto-adaptive scheme is advantage more than fixed threshold detection.
Analysis of Hyperspectral Images Based on PCA
Authors: Chen Qiao , Wang Li Jie , Westland Stephen
Published: February 2011

Recent computational models of color vision demonstrate that it is possible to achieve exact color constancy over a limited range of lights and surfaces described by a low-dimensional linear model. For smooth reflectance spectra the different spectral bands have a significant degree of correlation. Any spectral reflectance distribution can be approximated to a specified degree of accuracy as a weighted sum of basis functions. Reflectance spectra of hyperspectral images of the natural scenes are supposed to represent the real world better than any certain classes of natural and man-made spectral reflectance data sets such as rocks, leaves, Munsell chips, etc. The characteristics of the spectra will be important to understand the spectral properties of the object reflectance and the representation of spectral images by linear models. In this study sets of hyperspectral images have been analyzed by principal-component analysis (PCA) method for spectral encoding.
Microscopic Traffic Simulation Based Dispatch Modeling for Taxi Booking Service
Authors: Wang Hao , Lee Der Horng , Cheu Ruey
Published: February 2011

This paper presents a study of taxi booking service in Singapore using a microscopic traffic simulation model embedded with a link-to-link shortest path algorithm. A novel trip-chaining strategy for taxi booking based on a customized algorithm of Pickup and Delivery Problem with Time Window (PDPTW) was proposed. The idea is to chain several bookings with demand time points which are spread out within a reasonable period of time, and with each pick-up point coinciding with or being within close proximity to the previous drop-off location. Based on the simulation results, the proposed system has the potential to improve the taxi booking service currently operating in Singapore.
Improving Image Contrast of Fiber Point Diffraction Interferometer
Authors: Nie Liang , Han Jun , Jiang Xu
Published: February 2011

To measure spherical surface with high precision, an advanced fiber point diffraction interferometer (FPDI) is introduced in this paper. Based on the system principle, the factors that affect the interference image contrast are put forward and analyzed, such as fiber optical properties, interferogram background and intensity match of two beams. Then the optimization method is proposed. The single-mode fiber with core diameter 3λ is selected and the dispersion between modes is removed. The short coherence length laser is designed with a semiconductor solid-state laser and meets the need of FPDI. By coating film on the fiber end face, the light use ratio is improved significantly. Finally, the fiber point diffraction interferometer system is set up in experiment and the interference fringes are obtained. The result shows that the FPDI can achieve interference patterns with high contrast after optimization and the system has reached a relatively high accuracy.
View on Java Teaching from Cognitive Psychology
Authors: Xia Ming Ping
Published: February 2011

Gagné's cognitive learning theory presents the entire process of information processing and problem-solving. Under cognitive psychology’s guidance, teaching should pay attention to the analysis of students’ existing knowledge and experience and teach in accordance with individual differences. The goal of java teaching is to train the application ability of students’ problem-solving.
Study of the Methods and Tools for Ontology Integration
Authors: Bai Ru Jiang , Wang Xiao Yue , Yu Xiao Fan
Published: February 2011

Ontology integration is to eliminate ontology heterogeneous, so as to achieve the highest level of semantic communication and semantic integration, and finally achieve knowledge reuse and interoperability. The paper describes the four main methods and the five main tools for ontology integration, and then compares and analyses them.
The Application of Fuzzy-Based Internet of Things in Household Security
Authors: Lu Bo Yong
Published: February 2011

Household security is a specific application in intelligent building, which is of great significance to people, particularly to the aged and children. This paper applied networking technologies to household safety, adopting RFID to mark the hazard source of the houses of the aged and the children, and set up different risk factors for disparity ages. It designed a safety household prototype system, using fuzzy reasoning method. And made a hazard identification and risk analysis toward the achieved information. Finally, provide a corresponding level of hazard warning, according to the risk coefficient.
Research and Design of Digital Clock Based on FPGA
Authors: Zhu Juan Hua , Wu Ang , Zhu Juan Fang
Published: February 2011

A digital clock system designed by using VHDL hardware description language is presented in this paper. The proposed architecture fully utilizes the digital clock system available on FPGA chips based top-down design method in the Quartus II development environment. The Clock system is divided into four design modules: core module, frequency_division module, display module and tune module. It not only can time accurately and display time, but also can reset and adjust time. The LED lights will flash and the loudspeaker will tell time on the hour. The architecture is implemented and verified experimentally on a FPGA board. Because of the universality of digital clock and the portability of VHDL language, it can be applied directly in various designs based on FPGA chip.
Application and Research of Virtual Prototype Technology for Wood Powder Disintegrator Used in Fuel
Authors: Yang Lan Yu
Published: February 2011

Wood powder disintegrator used in fuel is key equipment in production of wood powder used in fuel, and virtual prototype technology is introduced. Some components for the wood powder disintegrator used in fuel such as spindle component, fixed cutters component and braking device are completed three-dimensional entity model by using many soft wares as Pro/E. Wood powder used in fuel after being produced is carried out size detection, and its average size may arrive at 108.21μm, and its size may fully complete with requirements for wood powder used in fuel. Therefore, it can provide a new method to optimize structure of wood powder disintegrator used in fuel according to studying further based on the virtual prototype technology, and there are not only real economic significance and but also broad application prospects.
Research on Status and Problems of Environment of Mountain’s Lake Tourism Attractions in Xinjiang
Authors: Sun Hao Jie , Chen Xue Gang
Published: February 2011

As the Internet technology develops, tourist e-commerce in China develops rapidly, and Xinjiang enjoys an advantage in developing e-commerce. Through analyzing the status quo of tourist development in Xinjiang and the actual application of e-commerce in tourism, this text points out the problems and shortcomings of Xinjiang tourist e-commerce, aiming to provide reference for the development of Xinjiang tourist e-commerce.
A Finite Element Analysis on Mechanical Property of Externally Strengthened Prestressed Box Beams
Authors: Wang Rong Xia , Li Hong Jiang
Published: February 2011

The mechanical property of external prestressed beams is affected by many parameters. Based on experimental study on externally strengthened prestressed box beams, a three-dimensional finite element analysis model was built in ANSYS. The calculation results was proved to be correct by being compared with experimental results. The effect of some parameters on deflection and stress in externally strengthened box beam was deeply analyzed in serviceability stage and ultimate status. The study shows that different original status of strengthened beam may affect the deflection and stress in different degree. The parameters change, such as effective prestress, concrete strength, the area and depth of external tendons and displacement coupling character for contact node, will result in a little difference in deflection and stress in serviceability stage, but obvious in ultimate status. For box beams in the model, changing the tendons lateral distance to the web results in litlle change in deflection and stress. No matter it is inside or outside the box at cross section.
Discussion and Practical Research of Moral Education in Physical Education
Authors: Wang Hui
Published: February 2011

Teaching practice in physical education, how to approach moral education penetration and the way of penetration enriches the methods of moral education, also represents the developing trends that the physical education teaching will play an important role in the process of training students in ideological and moral traits. This article explores the moral function of physical education, the moral values of physical education and physical education conferred by the natural characteristics of some moral education. Explores the relationship between physical education and moral education, advantage which by means of physical education to teach student moral training in the curriculum. Explained in sports activities should adhere to the implementation of the principle of moral education, in sports activities implement the contents of moral education, and the implement strategies and approaches of moral education in physical education teaching. The main purpose of this article is to provide a full range of penetration moral education for university education, implement education concept of the central crew, excavate the moral value of physical education teaching, and provide the possible theoretical basis for physical moral education courses.
A Study on Transition from Near Field to Far Field of Echoes from Underwater Simulated Targets
Authors: Xu Yu , Yuan Bing Cheng , Zhang Hong Gang
Published: February 2011

With the distance between sonar system and target enlarging, the underwater target transits from near field to far field. Based on planar element scattering similarity, a novel algorithm is presented in this paper. In this thesis, an underwater target model is set up and meshed with triangular planar element by using the software of Ansys. Due to the sonar system is in far field to every planar element, the matrixes whose elements are the planar elements target strength can be calculated. In the course of an underwater target transits from near field to far field, the matrix whose elements are the planar elements target strength is becoming more and more similar to that in far field. Thus the correlation coefficient between the above two matrixes can be used to analyze the transition of an underwater target. Numerical calculation are presented, and the results show that the underwater target scattering characteristics in critical distance approximate the characteristics in far field, but the target strength which is calculated in critical distance is also should be modified little.
Mechanical Properties of Flip-Chip Solder Joints Effected by Electromigration
Authors: Lu Yu Dong , En Yun Fei , Wan Ming , He Xiao Qi , Wang Xin
Published: February 2011

A frequent cause of failure of portable and hand-held devices is an accidental drop to the ground. The effect of electromigration on the mechanical properties of solder joints was discussed in this paper. Without current stressing, the samples were broken in the bulk of solder or at the interface of Al interconnect and solder. If the Al-solder interfacial mechanical strength was improved by changed the interfacial structure or optimized the jointing process, the flip chip devices would show the lonely ductile fracture in the bulk of solder. After electromigration the samples were broken abruptly at the interface near the chip side while the bulk of the solder joints maintained the original shape. Due to the interfacial reaction and the polarity effect of electromigration on the interfaces, a ductile solder joint can become a brittle solder joint. The ductile-to-brittle transition is very sensitive to a high speed shear stress applied to the joints. Because solder alloys are ductile by nature, it is of interest to understand how electromigration can influence the mechanical properties of solder joints’ interfaces and change their ductile nature. Owing to the polarity effect of electromigration, vacancies will accumulate to form voids at the cathode interface of solder joints. Besides, much more intermetallic compound formation at the joint interfaces also caused the ductile-to-brittle transition. Thus the interfaces become more and more brittle with time due to IMC formation or vacancy accumulation from electromigration.
Integrated CAD System for Bridges Based on BrIM
Authors: Luo Xiao Qun , Wang Zhong Quan , Wu Jie
Published: February 2011

The concept of BrIM (Bridge Information Modeling) is proposed and the technical features of BrIM are briefly described. A bridge CAD system based on BrIM concept is developed under the graphic platform of AutoCAD using ObjectARX. Data interface between 3D solid geometric database and each stage of bridge lifecycle is introduced. The essence of BrIM is realized that all informations including geometric data and non-geometric data are stored in the only knowledge database and all informations of bridges in different stages, such as design, construction and service, are obtained in the only database.
Thermal-Field Experimental Study of a Thin Circular Carbon-Fiber Tube in Stratosphere Environment
Authors: Pei Fen Bo , Tao Guo Quan , Wu Zhe
Published: February 2011

The changeable, atrocious environment of stratosphere affects the capability and performance of the structure. An effective and economical approach used to analyze thermal state of stratospheric aerostat was investigated in this study. A simplified thermal model was built in environmental experiment which simulates stratosphere and takes radiation of the sun, air and earth. This model solved a coupling problem of heat conduction, heat convection and radiant heat transfer and obtained a pleasant result through numerical simulations of Fluent. The whole process makes great effect to further analysis and study of stratospheric structure.
Effects of Thermal Exposure on Mechanical Properties of Al-4.87Cu-1.2Mg-1.0Ag Alloy
Authors: Duan An Jing , Jiang Wei , Ou Yao Hui , Qin Jian Jun , Liu Zhi Yi
Published: February 2011

Mechanical properties and microstructural evolution of an Al-Cu-Mg-Ag alloy during thermal exposure at elevated temperature were characterized by means of tensile tests, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) observation. The tensile test results suggested that tensile strength (σb) and yield strength (σs) reduced with both increasing exposure time and temperature. When exposed at 150°C, the Al-4.87Cu-1.2Mg-1.0Ag alloy exhibits good structural stability due to the excellent thermal stability of the Ω phase. SEM results showed that the specimen was fractured in a combined manner of intergranular and transgranular fracture. TEM results suggested the reduction of mechanical properties of samples was attributed to the coarsening of Ω phase and the precipitation of S' phase during thermal exposure.
Improvement of Tribological Behavior of Biomedical Nanostructured Titanium by Magnetron Sputtered SiC Films
Authors: Zhang Ti Feng , Xu Xiao Jing , Ling Zhi Yong , Pang Wei , Wu Su Feng , Sheng Xin Lan , Liu Min
Published: February 2011

The nano-indentation and friction/wear properties of a magnetron sputtered SiC (silicon carbon) films on nanostructured titanium (produced by severe plastic deformation) substrate were investigated. The results show that the films exhibited low nano-hardness (10.6 GPa), low Young's modulus (83.3 GPa) and high hardness-to-modulus ratio (0.128). As sliding against Si3N4 (silicon nitride) balls (2 mm in radius) under Kokubo simulation body fluid (SBF) at room temperature, the films displayed superior friction/wear properties at the considerably high normal load of 1000g, with the friction coefficient of about 0.18, the special wear rate on the order of 10−6 mm3 N-1m-1 without film cracking and interface delaminating. The impressive film cracking and interface delaminating resistance is in accordance with the low hardness (high ductility) of the films and the small film-substrate modulus difference that was caused by the low modulus of the films.
Photo-Aging of Polyurethane Coating Based on TDI-TMP and N3390
Authors: Xiang Bin , He Hai Yun , Zhu Ren Qing , Liao Jin , Chen Shi
Published: February 2011

The photoaging of polyurethane coating based on TDI-TMP and N3390 was conducted though UV exposure. The properties of studied polyurethane coatings, such as ﬁlm thickness loss, gloss loss, discoloration and ultraviolet absorbance were examined at some aging intervals. In addition, scanning electronic microscopy (SEM) and Fourier transform infra-red spectroscopy (FTIR) were used to measure the morphology and chemical change of coatings before and after exposed in a UV lamp chamber. It was found that the addition of N3390 had a signiﬁcant effect on the discoloration of polyurethane coating, and coating without N3390 had greater degradation. The above results suggested that a mixed curing agent system with a mass ratio of TDI-TMP to N3390 between 5:5 and 3:7 be a possible substitute of pure N3390 for weather resistance PU coatings.
Effect of Frequency on Composition and Microstructure of Siliconized Layer Using Pulse Electrodeposition
Authors: Yang Hai Li , Hao Ping Ju , Tang Guo Zhang , Li Yun Gang
Published: February 2011

The siliconized layer on low silicon steel substrate was produced under pulse current conditions from KCl-NaCl-NaF-SiO2molten salt and the effects of frequency on the composition and microstructure were investigated. The results showed that at the same average current density and other experimental conditions, Si content in the surface and the layer thickness decreased with increasing frequency. Low pulse frequency (500 Hz) and high frequencies (1500, 2000Hz) produced coarse grain and bigger surface roughness. There was a flat fine grain structure and a relatively thick (30m) layer when the frequency was 1000Hz. However, the effect of pulse frequency on the structure of the layer was not obvious. The phase structure of the layer was composed of Fe3Si with (110) preferred orientation at all experimental frequencies.
Surface Treatment of Magnesia-Calcia Firebricks with CO2
Authors: Chen Shu Jiang , Li Guo Hua , Tian Lin , Cui Yan , Pan Jin
Published: February 2011

For the hydration of magnesia-calcia refractory, this paper uses a new hydration-resistance technology. Namely using chemical methods, through surface and CO2 occurring chemical reaction which generates CaCO3 layer. The surface of magnesia-calcia firebricks are modified so that closed or stability, playing a role in hydration-resistance, and significantly improves the hydration-resistance. By SEM energy spectrum analysis and hydration resistance test, we obtained optimal technological parameters: reaction temperature is 700 °C for 4-5 hours, suitable water vapour temperature is 40°C, and the appropriate CO2 flow is in the 4-4.5L•min－1.