bluuebunny/crossref_metadata_2025 huggingface dataset:
Design of a New Vacuum Cleaner
Authors: Chen Lan Zhen , Gao Long Shi
Published: May 2011

The main purpose of this design is to raise the drawing power of the vacuum cleaner. All researches were done at the original vacuum model which typed U36. After analyzing the structure and work principle of the vacuum cleaner, a related influence factor of vacuum inhalation efficiency and combine the principle of an experiment method were put forward. Then Improvement design of motor, seal system, filter system and blow vent had been analyzed and tested by experiment method respectively. At last, the total effect of drawing power and noise testing had been tested. The results showed that the improvement design is successful.
Preparing of SMC Artificial Marble and its Mechanical Properties
Authors: Li Jian , Huang Zheng Qun , Qin Yan
Published: May 2011

In this article, a kind of SMC artificial marble was prepared. In order to enhance the mechanical properties and prolong the using life of SMC artificial marble, some effects such as fiber content, filler content and molding temperature etc. on the mechanical properties were carefully studied, too. Results showed that the increase of fiber content could improve the impact strength of SMC artificial marble when the fiber length was 10mm and the increase of filler content would decrease the flexural strength of SMC artificial marble. And the molding temperature at the range of 130°C ~ 160°C had little influence on the mechanical properties of SMC artificial marble. Comparing with natural marble and casting marble, SMC artificial marble owed superior overall performance and it was much more suitable for industry production.
Residual Stress Modeling and Simulating for the Panel with Interference-Fit Riveting
Authors: Yang Dian Guo , Zhang Kai Fu , Li Yuan , Cheng Hui , Liu Bo Feng
Published: May 2011

The interference-fit riveting technique is widely used in aircraft assembly, which can generate residual stress around the wall of hole and significantly improve the fatigue life of the structure. The residual stress is usually determined by experiment or numerical simulation, locking of theoretical support. So this paper researches the residual stress modeling of the panel in a riveting process. Firstly, based on the axisymmetric upsetting theory, dividing the riveting process into two stages, the formulas for calculating the contract pressure caused by the rivet around the hole of panel are built. Secondly, under the action of contact pressure, the residual stress distribution expressions are developed by elastic-plastic mechanics. Finally, in ABAQUS system, a three-dimensional instance made up of one flush rivet and two panels of aluminum alloy is used to verify the theoretical formulas. The feasibility of the theoretical formulas about the residual stress of the panel is validated by comparing the theoretical calculation and finite element simulation results.
Explore on the Feasibility of RFID Technology in Library
Authors: Liu Pu
Published: May 2011

Internet of Things (IOT) is an important part of the new generation information technology; it has been applied successfully. As a key technology of the IOT, Radio Frequency Identification (RFID) has been promoted and applied in a number of areas, including library management. This paper introduces the IOT, and then studies the work principles and technology standards of RFID, and compared with other identification techniques; last, this article explores the application feasibility of RFID in library and pointed out its shortcomings.
Privacy Protection in Cloud Storage
Authors: Zhang Jian Hua , Zhang Nan , Fu Chun Chang
Published: May 2011

The storage security technology in cloud storage applications was analyzed, and in order to satisfied the demand for privacy protection, the key technology of data encryption and authentication are described and the methods of privacy protection in data mining under the cloud were discussed. At the same time, a hierarchical mechanism of authentication was proposed. These methods and mechanisms could solve the problem of privacy protection in a certain degree, and ensure the security of cloud storage.
An Road Obstacle Detection Method Based on Monocular Measurement
Authors: Jin Hong Jiao , Lin Shen , Luo Shi Guang
Published: May 2011

Obstacle detection in the intelligent vehicle vision navigation system occupies a very important role. The studies for the obstacles detecting, especially Monocular Measurement from the computer vision, simplifying monocular vision system to camera projection model. Getting the conversion relation between image coordinate and the world coordinate system through the geometry derivation to establish the measurement model and achieve the obstacle measurement. The experiment proved that the error of this measurement model selected is within the acceptable range.
Vibration of Diatomic System in One-Dimensional Nanomaterials
Authors: Lu Jun
Published: May 2011

By means of the hypergeometric series method, the explicit expressions of energy eigenvalues and eigenfunctions of bound states for a diatomic system with a hyperbolic potential function are obtained in the one-dimensional nanomaterials. The eigenfunctions of a one-dimensional diatomic system, expressed in terms of the Jacobi polynomial, are employed as an orthonormal basis set, and the analytic expressions of matrix elements for position and momentum operators are given in a closed form.
A Study of Three Dimensional Modeling Technology on Food Twin-Screw Extruder
Authors: Zhao Chun Fang , Lin Jiang Jiao , Zhu Li Xue
Published: May 2011

Three-dimensional model of the parts of the extrusion extruder for leisure food is created as an illustrator, which could be adopted up to form an assemble facility to the whole set of the machine conveniently by a software of SolidWorks in the paper.Some key specific modeling procedures are proved to show the advantages of Solidworks overweigh AutoCAD in three-dimensional modeling technology. The method put an adaptable way to short the whole lifetime of industrial product design.
On the Topology Design of Integrated Wireless Networks
Authors: Yan Xin , Du Jia Gen
Published: May 2011

Topology clustering, constructing overlay graphs, adding relay nodes, or creating a “small-world” network by building some shortcuts etc, topology control schemes are able to achieve the scalability, resilience, and fault-tolerance for wireless communication networks. In this article, we take a different approach to reach such aim for heterogeneous integrated wireless networks by generating a topology such that the resulting network is “scale-free”. Thereby we propose a topology control algorithm based on the “scale-free” complex network concept and directed proximity graph theory for integrated wireless networks with non-uniform transmission ranges. In this algorithm, the topology is also generated by new nodes’ growth and preferential attachment procedure, but where each new node connects to the existing nodes in its directed attachable proximity in terms of certain probability at each time step. Each node’s directed attachable proximity graph is generated from its directed reachable proximity graph that is built by regulating its transmission power based on locally collected information. The simulation experiments are provided to validate our claims.
Healthcare Information System and Data Mining
Authors: Kuo Nai Wen
Published: May 2011

This paper is to integrate information technology and medical-related technologies to develop a healthcare information system for comprehensive geriatric assessment. This system not only can process geriatric consultation services and ensure that all patient’s information are stored in standardized format , but also provide medical personnel for statistical analysis and processing purposes. This paper uses the Apriori algorithm of data mining for helping doctors to find out the relationship of geriatric syndrome. The systems of this paper can improve increase the timeliness and accuracy of patient care and administration information, increase service capacity, reduce personnel costs, and improve the quality of patient care in geriatric medicine. Furthermore, making the theories and applications of medical informatics will be more extensive and convenient for researcher and healthcare-related industry.
Study on Pine Wilt Disease and its Control Situation
Authors: Li He , Zhou Guo Ying , Liu Ju Nang , Zhang Huai Yun
Published: May 2011

The pine is an important tree species in China, while the pine wilt disease is a devastating disease of pine trees. Pine wood nematode (Bursaphelechus xylophilus Steiner & Buhere, 1934 Nickle, 1981) is a world recognized major alien species in the world. It’s from the United States, but pine wood nematode does not seriously endanger the pine in China; the most endangered place is Japan, after several decades of research and control, it has been basically able to control the occurrence of pine wilt disease. The spread trend of pine wilt disease in China grows more and more obvious, which has become an important intrusion pathogenic organism. It not only causes a devastating threats the million hectares pine forest in southern China, but also affects China’s economy and social sustainable development, what’s more, it will damage some of famous scenic spots and cultural heritage sites in China. Meanwhile, the pine wood nematode is a technical barrier, which seriously impacts on China’s import and export trade. The pathogen, pathogenesis, modes of transmission and means of distribution patterns, rapid detection and control methods of pine wilt disease are reviewed in this paper, and we hope that it can provide references for effective control of pine wilt disease in China.
The Improvement Method Design for β-SiC Recrystallization
Authors: He Bing Quan , Chen Wen Ting , Zheng Yang
Published: May 2011

Sintered SiC ceramics with difficulty, and its production process and production are more expensive, lower sintering temperature of SiC ceramics and look for new low-cost production process is the focus of materials research workers. Re-crystallization of SiC components of the raw materials requirements of high purity, can not add sintering aids, sintering temperature up to about 2450°C). In this paper, by improving and optimizing the existing production process, to lower the sintering temperature of the new methods and ideas, the study shows that: β-SiC will be added to the sintered α-SiC slurry, and the best particle size ratio of α: β = 15:1 mixture, at the same time, according to re-crystallization of SiC sintering theory, the fine particles (β-SiC, has played the role of sintering agent) adsorption in the coarse particle (α-SiC, the role of the support skeleton) and can greatly reduce the SiC Sintering temperature (50-100°C), and to improve the purity of α-SiC, the most economical way to prepare a high-density, high oxidation resistance, high impact resistance, high strength, high mechanical properties of recrystallized SiC powder .
A Kind of Load Balance Multicast Routing Algorithm Based on Distributed Computation and Centralized Control
Authors: Chen Xiang , Tang Jun Yong , Zhang Yong
Published: May 2011

Distributed routing can find multicast tree and adapt to dynamic changes of multicast members in case of acknowledge local network state. Majority of current distributed multicast routing algorithms based on the shortest delay, which can achieve load balance large additional overhead. The paper presented a kind of load balance multicast routing algorithm based on distributed computation and centralized control. It reside computation Agent in each node to compute forward probability and to maintain node routing table, node state table and forwarding probability table. In addition, it can detect delay of adjacent nodes and coordinate session establishment based on the copy, parameter transmission and notification of control Agent. On this basis, the algorithm achieved dynamically joins and leave session of multicast members. Algorithm analysis results show that the algorithm can improve the overall efficiency of network transmission.
Fault Diagnosis Research of TWERD Frequency Converter Based on Wavelet Transform
Authors: Wang Xin Sheng , Zhang Hua Qiang , Zhang Tian Min
Published: May 2011

Taking TWERD frequency converter as research object, the working principle and fault types of three-phase SPWM inverter are analyzed. Its output line voltage waveform in normal operation and fault condition is studied. According to the fault information and the different data of input and load changes, the frequency converter output line voltage waveform is decomposed by wavelet transform. The low frequency energy value is picked-up and regards it as eigenvector. The mapping relationship between eigenvector and fault types are established by BP neural network, the fault bridge and fault location of frequency converter are found. Simulation results show that the diagnosis accuracy is 96.5% after training 46 times. Fast convergence speed and high precision is obtained.
Research on the Business Model and Protocol of Offline Digital Coupon Based on RSA Digital Signature
Authors: Meng Hao Yu , Feng Yun Hua
Published: May 2011

Digital coupon, a popular e-commerce application, which makes the coupon circulating on internet by the digital forms. The real commercial system hasn’t presented yet in current domestic. The problem lies in the e-business model, anonymous, fair transaction, and free circulation. In this research, the author analyzed the domestic and foreign researches, defined the e-business model of mobile e-coupons, puts forward a set of digital coupon protocols with offline presentation, offline payment, and verified the anonymous, fair transaction, free circulation of the protocols. This study derived a test system has good efficiency, implementation, practicability and innovative. The obtained theory and experience can be a meaningful reference to other studies in relevant fields.
Design of Digital Display Control Devise System for Concrete Mixer Truck
Authors: Chen Yu Liang , Du Yong You , Jia Zhao Huan , Zhao Wei
Published: May 2011

The paper studies the principle and the flaw of the hydraulic control organization of concrete mixer truck, and designs one kind of brand-new Digital Display control devise. According to principle of the new Digital Display control devise, it has determined shifting block’s displacement quantity and the displacement limit of the key component of unloading Control devise. At the same time, the design has realized the accelerograph’s control device, and compared with the merit and demerit between the new and old control devise based on the basis of the practice application.
Research on Automobile Suppliers Evaluation Based on Statistical Analysis
Authors: Su Hai Tao , Guo Hai Qing , Ma Xiao Wei
Published: May 2011

The service performance of suppliers is key concerns for the enterprises in recent years, and there are lots of methods to evaluate the performance of suppliers, especially for the automotive company. This paper preliminary analyzed the literatures of the suppliers’ evaluation, and summarized the main contents and methods used to evaluate the suppliers of automobile enterprise which are being focused on by many scholars. And then, the actual case is applied , a automobile enterprise has built 22 indexes to evaluate the performance of its parts suppliers in China, by use of SPSS, the results of parts suppliers evaluation were analyzed. The overall supply capacity remained stable, to some extent, declined partly, the joint venture company (in China) got the lowest mean, which have the remarkably difference from the private company and the joint venture company (out of China). So it is crucial to take the further measures to improve the service and product quality of these two parts suppliers.
Netted Radar System Design with Spread Spectrum Technology
Authors: Fu Lian Qing , Yang Li Sheng , Wang Tao , Zhang Qing Le
Published: May 2011

In this paper, a novel netted radar system is designed to reduce the influence of mutual interference between signals. The emission signals of all stations are assigned the orthogonal PN codes. Because of the good autocorrelation and cross-correlation properties, mutual interference becomes weaker and signals from different stations could be separated by the preassigned PN codes. At the same time, the spectrum of the emission signal is spreaded, the peak-to-mean envelope power ratio (PMEPR) and the intercepted probability of the signals descend therefore. Simulation results show the good performance of the proposed approach.
Modeling Methodology Based on Stacked Neural Networks for Inferential Prediction of Polypropylene Melt Index
Authors: Xia Lu Yue , Pan Hai Tian , Zhou Meng Fei , Cai Yi Jun , Sun Xiao Fang
Published: May 2011

A modeling methodology based on stacked neural networks by combining several individual networks in parallel is proposed. Stacked neural network as an effective method for modeling of inherently complex and nonlinear systems especially a system with a limited number of experimental data points is chosen for yield prediction. 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 robust least squares estimation is proposed. Inferential prediction of melt index as the most important characteristic process of polypropylene polymerization has been carried out. The application of the proposed modeling method based on stacked neural networks to the development of melt index soft sensor in an industrial propylene polymerization plant demonstrates its effectiveness.
Simulation of Temperature Induced Colorimetric Shift of YAG:Ce0.06,GDx Phosphor
Authors: Ji Ting , Zhang Xiao Song , Xi Qun
Published: May 2011

YAG:Ce0.06,Gdx phosphors were prepared by solid-state method, and temperature dependence of chromaticity coordinate and correlated color temperature of YAG:Ce0.06,Gdx are investigated. Three PL spectra all have broad emission band between 500 nm and 620 nm is assigned to the combination of the lowest energy of 5d bands and the 2F5/2 and 2F7/2 states respectively. With increasing temperature, the x values of chromaticity coordinates of YAG:Ce0.06,Gdx with Gd concentration increase all increase, but y values all decrease. Differently, z values do not show a clear trend. Moreover, correlated color temperature of YAG:Ce0.06,Gdx with Gd concentration increase all decrease with the temperature increase.
Design for Digital Display Device and the Function of Control of Concrete Truck-Mixer Drum
Authors: Chen Yu Liang , Du Yong You , Jia Zhao Huan , Zhao Wei
Published: May 2011

The paper discusses the principles and shortcomings of the concrete mixer truck’s hydraulic control mechanism. The stepper motor technology controlled by the electrical impulses is used to develop a new digital display control device, and determine design principle and implementation process of the electronic control part. At the same time, it develops control device’s digital display mechanism and wireless remote control devices. At last, it compares the performance advantages and disadvantages between the traditional mechanical control handler and the digital display remote controller according to the engineering practice.
A Method to Determine Unstable Point and its Impact Estimation in Debris-Blocking Dam Monitoringsurvey Network
Authors: Huang Da Bing , Yang Zhi Qiang , Shi Zhen
Published: May 2011

The purpose of this paper is to determine the unstable points of debris-blocking dam deformation network and to lay the foundation for later accurate monitoring and data processing, for the reason that the affection of earth pressure and water-level-fluctuation lead to increased instability to debris-blocking dam. The author signed one horizontal displacement deformation monitoring network, measured two groups data by changing some point’s horizontal displacement with man, judged the point’s stability of the network by the method of mean gap and obtained the deformation model, and analysis the model sensitivity. The results is that the deformation network stability meet the design requirements through application the method in Fengjie Debris-blocking dam which blocked the stones debris for Shirushan tunnel, the actual displacement amount had been proven similar as the result with the method; It is concluded that this method have some practical value in deformation monitoring because it can construct the approximate model by direct observation data, which is smaller rely on other information.
The Corrosion Performance of a Binary Cu-Ni Alloy Used as an Anode for Aluminum Electrolysis
Authors: Lu Jie , Xia Zheng
Published: May 2011

A binary Cu–Ni alloy (69.93 wt. % Ni+Co) has been investigated as a potential inert anode in a laboratory electrolysis cell. When the electrolyte temperature, electrolyzing time and polar distance were set to be 960 °C, 4 h and 3 cm respectively, the corrosion resistance of Cu-Ni alloy materials in aluminum electrolyte was studied in the electrolyte composed of synthetic cryolite, alumina, aluminum fluoride, magnesium fluoride, calcium fluoride and aluminum by changing the molecular ratio of electrolyte, the concentration of alumina and current density of electrolyte, respectively. The results shows that the Cu-Ni alloy materials could reduce material loss when the electrolyte is with the optional conditions of the content of alumina in electrolyte approaching to 6 wt. %, the molecular ratio at about 2.2 and current density near to 0.5A/cm2. Thus the corrosion ratio of Cu-Ni alloy per year was measured to be 1.27cm/a.
Analysis on Technology Input Structure Based on Grey Theory: Evidence from China
Authors: Liu Shu Hui , Li Wu Wei
Published: May 2011

Based on the statistical data released by National Bureau of Statistics of China, over the period 2000-2008, this paper empirically analyzed Chinese technology input structure through investigating the relationship between economic growth and technology input including scientists and technicians and expenditure for R&D using the compensative GM (1,N) model in the grey theory. This paper applies the Principle of Least Square Method to estimate the parameters of the system equation. Research results show that the compensative GM (1,N) model established in this paper has a high precision, and that the contribution of expenditure for R&D is greater than that from scientists and technicians, which could provide valuable information to policy makers in their efforts to make effective technological policies for promoting economic growth.
Object Petri Nets Based Monitoring for the Aircraft Assembly System in MES
Authors: Wu Feng , Zhang Le
Published: May 2011

Monitoring design is one of basic problems during the development of manufacturing execution systems. In this paper we study the monitoring problems for the Aircraft assembly system in manufacturing execution system environment according to the computer integrated manufacturing system architecture of the Aircraft Company in China. We show that the problem of designing monitoring system for manual assembly system is reducible to modeling and synthesizing problem of monitoring system based on Object Petri Nets. Next the problem of implementing the monitoring system results in designing of structure and functions of the monitoring system. In particular, an efficient rapid prototype schema for implementation is presented. An application is demonstrated how to deal with object Petri nets based monitoring for the aircraft vertical fin assembling.
Flaw Sizing Detection by Pulse-Echo Ultrasonic Technique
Authors: Her Shiuh Chuan , Chang Ming Chih
Published: May 2011

Ultrasonic is one of the most common uses of non-destructive evaluation technique. It could detect flaws inside the structure and on the surface such as voids, holes and cracks. In this investigation, a 304 steel block with a small hole inside the structure was fabricated. The radius of the hole was evaluated by the pulse-echo ultrasonic technique. In this work, 2.25MHz, 5MHz and 10MHz of incident waves were employed to detect the radius of the hole inside the structure. The errors of a hole with 2.5 mm radius measured by 5 MHz and 10MHz longitudinal wave were 1.15% and 6.6%, respectively. Experimental results showed that the accuracy of flaw sizing detection by ultrasonic technique depends on the frequency of the incident wave.
Using Artificial Neural Network to Filter Spam for Chinese Mail
Authors: Pi Shih Ming , Liao Hsiu Li , Liu Su Houn , Liu Ding Kang
Published: May 2011

As the Internet developed, the problem of spam has become increasingly serious. Not only caused great distress to individuals, but also have a great business costs. With improvements in computing speed, neural network is becoming a very good tool for text classification. The purpose of this study is to conduct few experiments by using neural network approach for Chinese mails’ content. The result shows that neural network approach is effective for Chinese mails’ spam-identification and the adjustments of some parameters (the number of keywords, the number of nodes, and the number of categories) also increase the accurate rate, while reducing false positives.
Discussion and Suggestion for the Design of Slope Anchor Bolt
Authors: Kong Xiang Gang , Zhang Xin Gui , Wang Yang
Published: May 2011

In the design of anchor bolt for slope reinforcement, determination of safety factor, anchorage length and free part length, choosing anchor-type were closely linked with the practical situation and experience of the designer. In this paper, in terms of above four aspects, some problems in the process of design have been discussed and corresponding solutions have also been put forward based on the codes and personal experience.
Model and Control of Nitrogen Releasing of Lakes’ Sediment
Authors: Liu Ya Li , Duan Xiu Ju
Published: May 2011

Shuanglong Lake is a shallow lake in the urban city, which has been a typical eutrophic lake. After synthesizing harnessing and control of outside pollutions, the endogenesis pollutions caused by polluted sediment may become the main nutritional burden of the lake. As for this, it is important to ascertain the releasing principles of nitrogen, which is the restrict nutrition factor of the lake. It can rehabilitate and maintain water quality of the Shuanglong lake, provide that the scientific foundation for harnessing the lake and protecting the environment. This paper had reported the investigation of nitrogen release from sediment of lake, and marked environmental factors include temperature,dissolvable oxygen, pH and hydrodynamic power, the releasing model can be obtained: r=12.931+0.103[T]－0.36[pH]－0.728[DO]+0.490[K], which can be applied to analyzing and estimating nitrogen released from polluted sediment, and control the release by raising the level of dissolvable oxygen in the lake.
Fabrication and Oxidation Resistance Property of SiC Coatings on Surface of Graphite by Chemical Liquid Deposition
Authors: Zhu Yun Hu , Geng Hao Ran , Chen Guang Li
Published: May 2011

SiC coatings were fabricated by the Rapid Chemical Liquid Deposition (RCLD) on the surface of graphite, the influence of deposition temperature on the microstructure of SiC coatings was investigated, the oxidation behaviors of SiC coatings at different temperatures were analyzed. The results indicated that the optimum condition for the SiC coatings are at 1150°C, a smooth and dense coating will be obtained, the thickness of the coatings are between 80～120μm. The oxidation resistance test results indicated that after oxidation at 1000°C for 5h, the mass loss of the sample is only 21%.
Effects of Al-5Ti-B-2RE on the Microstructures and Mechanical Properties of Al-10Mg Alloy
Authors: Li J.Q. , Chen J.L. , Li Xianyi , Ma Xiao Li
Published: May 2011

This paper reported the effects of Al-5Ti-B-2RE on the microstructures and mechanical properties of an Al-10Mg alloys. It has been shown that the addition of 6wt.% Al-5Ti-B-2RE alloy can decrease the average grain sizes and increase the mechanical properties of the Al-10Mg alloy. Grain refinement mechanism is due to TiAl3 andTiB2 particles formation nucleation of aluminum，rare earth elements enhancing the kinetics of α-Al nucleation and inducing low growing speed of crystals. And the grain refinement strengthening and dispersion strengthening lead to improve the mechanical properties.
The Optimization Design Study of Selective Laser Sintering Process Parameters on the Pro-Coated Sand Mold
Authors: Cheng Rong , Wu Xiao Yu , Zheng Jian Ping
Published: May 2011

This paper presents experimental investigations on inﬂuence of important process parameters viz., laser power, scan speed, layer thickness, hatching space along with their interactions on dimensional accuracy of Selective Laser Sintering (SLS) processed pro-coated sand mold. It is observed that dimensional error is dominant along length and width direction of built mold. Optimum parameters setting to minimize percentage change in length and width of standard test specimen have been found out using Taguchi’s parameter design. Optimum process conditions are obtained by analysis of variance (ANOVA) is used to understand the signiﬁcance of process variables affecting dimension accuracy. Scan speed and hatching space are found to be most signiﬁcant process variables inﬂuencing the dimension accuracy in length and width. And laser power and layer thickness are less influence on the dimension accuracy. The optimum processing parameters are attained in this paper: laser power 11 W; scan speed 1200 mm/s; layer thickness 0.5 mm and hatching space 0.25 mm. It has been shown that, on average, the dimensional accuracy under this processing parameters combination could be improved by approximately up to 25% compared to other processing parameters combinations.
An Improved Fast Algorithm for Solving Toeplitz Systems in Mechanical Control
Authors: Tian Li Chao , Li Hong Kui
Published: May 2011

Pentadiagonal Toeplitz systems of linear equations arise in many application areas. Because of the structure and many good properties of pentadiagonal Toeplitz matrices, they have been applied in Mechanical Control. Based on [1], in this paper, we present an improved fast algorithm for solving symmetric pentadiagonal Toeplitz systems.
Modeling and Analysis of a Humanoid Robot Active Stereo Vision Platform
Authors: Du Qin Jun , Zhang Xue Yi , Huang Xing Guo
Published: May 2011

Humanoid robot is not only expected to walk stably, but also is required to perform manipulation tasks autonomously in our work and living environment. This paper discusses the visual perception and the object manipulation based on visual servoing of a humanoid robot, an active robot vision model is built, and then the 3D location principle, the calibration method and precision of this model are analyzed. This active robot vision system with two DOF enlarges its visual field and the stereo is the most simple camera configuration for 3D position information.
Development of Ceramic Moulds with Zirconia Primary Coat for Investment Casting of Gamma Titanium Aluminide Based Alloys
Authors: Chen Yan Fei , Xiao Shu Long , Tian Jing , Xu Li Juan , Chen Yu Yong
Published: May 2011

The fabrication of ceramic moulds with zirconia primary coat for investment casting of gamma titanium aluminide based alloys (hereafter called TiAl alloys) was described in this study. The microstructures and fracture strength of ceramic moulds were characterized. The fracture strength and surface roughness of the ceramic moulds with zirconia primary coat were sufficient for the TiAl investment casting. TiAl blades were used for the technology demonstration in producing TiAl components. TiAl castings produced by the ceramic moulds exhibited an average surface roughness (Ra ) of 6 μm.
Microstructure and Characteristics of Ti-Nb-Sn-HA Composite Powder Fabricated by Mechanical Alloying
Authors: Wang Xiao Peng , Xiao Shu Long , Chen Yu Yong , Liu Zhi Guang , Woo Kee Do
Published: May 2011

A novel biocomposite Ti-35wt%Nb-2.5wt%Sn-15wt%HA powders was synthesized by high energy ball mill(HEBM) for various periods of time. The microstructure and characteristics of the milled powder particles were investigated. Results showed that in the composite powders milled for 4h, Ti was still exhibited primary α phase, with the increase of ball milling time up to 8h, Ti transformed into primary β phase and a little α phase, after ball milling for 12h, Ti transformed into β phase fully. the transform temperature was 380.06°C. And TEM and PSD results indicated that nanostructure was obtained after 12h milling..
Reform and Innovation of Practice Teaching during Water Pollution Control Engineering Course
Authors: Lu Jie , Zhang Zi Jian , Pan Jia Fen , Ma Yan Fei
Published: May 2011

Water pollution control engineering is one of the main courses of Environmental Engineering specialty. In order to develop the technical skills and professional qualities of students in this area, the innovative mode of practice teaching was explored while the curriculum and practice teaching systems were constructed. The simulation system of water pollution control engineering and field practice system were integrated during the progressive innovation practice teaching, which produced good results.
Key Technologies and Development of Micro-Nano Positioning Platform with Large Travel
Authors: Zhang Yanfei , Hu Guang Xue , Gong Jinliang , Wei Xiu Ting
Published: May 2011

Depended on the continuous development of nanotechnology, many micro-nano positioning platforms have been developed. Considering the actual engineer need, technologies for design of the positioning platform with both large travel and nano scale accuracy have become an important research direction. Several large travel driving systems with nano resolution are compared, and further key technologies of large travel and ultra precision for design are also discussed. Analysis result is that there are two kinds of types of micro-nano positioning platform at present, that’s flexible hinges arranged structure and integrative mechanism of both general driving system and flexible structure. Merits and shortcomings for these two kinds of micro-nano positioning platforms are all presented and some useful conclusions are brought forward.
Vibration Characteristics Simulation and Experimental Study of Super-Heavy Vibrating Shaker
Authors: Chen Shuang , Guo Sheng
Published: May 2011

In this paper, vibration characteristics of super-heavy vibrating shaker were simulated by using MATLAB based on the developed analytical models. The important stiffness test experiment of elastic component-shaker rubber spring in compression, shear stiffness and experimental verification of mechanical models were made. Results show that the test data was consistent with simulation data, which verified the correctness of design and analysis.
Comparison of Disc Diffusion Methods for the Detection of Extended-Spectrum Beta Lactamase-Producing Enterobacteriaceae
Authors: Giriyapur Ravi S , Nandihal Namratha W , S. Krishna B V , Patil Asha B , R. Chandrasekhar M
Published: May 2011

Background: Resistance to broad-spectrum β lactams, mediated by extended-spectrum β lactamases (ESBLs), is an increasing problem world wide. This resistance poses problems for in vitro testing and reporting. Increased prevalence of ESBLs among Enterobacteriaceae creates a great need for laboratory testing methods that will accurately identify their presence.

Materials and Methods: During the study, the Enterobacteriaceae isolated were tested for the presence of ESBL by the National Committee for Clinical Laboratory Standards (NCCLS) screening test, Jarlier double disc synergy (approximation) test (DDST) and NCCLS phenotypic confirmatory test (PCT), and compared their efficiency in detection.

Results: A total of 313 Enterobacteriaceae were isolated and tested for the presence of ESBL. NCCLS PCT identified 200 (63.89%) as ESBL producers and DDST identified 176 (56.23%), with a P-value of <0.001. Among the screening agents, ceftazidime had a better sensitivity (89.49%) and specificity (95.74%).

Conclusions: Close monitoring of the susceptibility pattern of isolates and careful spacing with specific discs can identify many ESBL producers. Ceftazidime has a better sensitivity and specificity as a screening agent. A combination of different tests can be useful for accurate identification.
Objective assessment of utility of intraoperative ultrasound in resection of central nervous system tumors: A cost-eff ective tool for intraoperative navigation in neurosurgery
Authors: Moiyadi Aliasgar , Shetty Prakash
Published: May 2011

Background: Localization and delineation of extent of lesions is critical for safe maximal resection of brain and spinal cord tumors. Frame-based and frameless stereotaxy and intraoperative MRI are costly and not freely available especially in economically constrained nations. Intraoperative ultrasound has been around for a while but has been relegated to the background. Lack of objective evidence for its usefulness and the perceived “user unfriendliness” of US are probably responsible for this. We recount our experience with this “forgotten” tool and propose an objective assessment score of its utility in an attempt to revive this practice. Materials and Methods: Seventy seven intraoperative ultrasound (IOUS) studies were carried out in patients with brain and spinal cord tumors. Seven parameters were identifi ed to measure the “utility” of the IOUS and a “utility score” was devised (minimum 0 and maximum 7). Individual parameter and overall scores were calculated for each case. Results: IOUS was found to be useful in many ways. The median overall score was 6 (mean score 5.65). There were no scores less than 4 with the majority demonstrating usefulness in 5 or more parameters (91%). The use of the IOUS signifi cantly infl uenced the performance of the surgery in these cases without signifi cantly prolonging surgery. Conclusions: The IOUS is a very useful tool in intraoperative localization and delineation of lesions and planning various stages of tumor resection. It is easy, convenient, reliable, widely available, and above all a cost-eff ective tool. It should be increasingly used by neurosurgeons in the developing world where costlier intraoperative localization and imaging is not available freely.
Single photon emission computed tomography scanning: A predictor of outcome in vegetative state of head injury
Authors: Nayak Pralaya , Mahapatra Ashok K
Published: May 2011

Background: Neurotrauma is one of the most important causes of death and disability. Some of the severely head injured patients, failed to show significant improvement despite aggressive neurosurgical management and ended up in a vegetative state. Aims: To assess the outcome at six months and one year using Glasgow outcome scale (GOS), in this prospective study on patients with severe head injury, who remained vegetative at one month. Materials and Methods: This prospective study was carried out in the department of Neurosurgery, All India Institute of Medical Sciences (AIIMS), New Delhi, over a period of a year and a half (March 2002 through July 2003). Materials and Methods: In patients with severe head injury (GCS < 8), post resuscitation, neurological assessment was done with Glasgow coma scale (GCS), pupillary light reflex, doll’s eye movement and cold caloric test in all cases. Fifty patients, who remained vegetative post injury according to the criteria of Jennett and Plum, at one month, were considered for the study. Brain SPECT (Single Photon Emission Computed Tomography) Scanning was carried out in selected cases. Statistical analysis: Data analysis was done by Pearson’s chi-square test on computer software SPSS, Version 10 (California, USA). Results: Patients with preserved brainstem reflex and with no perfusion defect on SPECT scan had statistically significant favorable outcome. More than 40% of vegetative patients regained consciousness by the end of one year, of whom 24% had favorable outcome in the form of moderate disability and good recovery. Conclusion: SPECT is better than computed tomography/magnetic resonance imaging (CT/MRI) as it assesses the cerebral perfusion and functional injury rather than detecting the lesions only. Further study with a control group is necessary to establish the role of SPECT in head injury.
Depression in elderly patients with Alzheimer dementia or vascular dementia and its infl uence on their quality of life
Authors: Winter Yaroslav , Korchounov Alexei , Zhukova Tatyana V , Bertschi Natalia Epifanova
Published: May 2011

Background: Alzheimer dementia (AD) and vascular dementia (VD) are the most common causes of dementia in the elderly. Depression is an important co-morbid disorder in these diseases, which is often challenging to recognize. We investigated the prevalence of depression in patients with AD and VD and estimated the influence of depression on the health-related quality of life (HrQoL) in these patients. Materials and Methods: We evaluated prevalence of depression in consecutively recruited patients with AD or VD (n= 98). Depression was diagnosed according to criteria of the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) and scored using the Geriatric Depression Scale. The EuroQol (EQ-5D and visual analogue scale) was applied to evaluate HrQoL. The severity of cognitive impairment was measured by the Mini-Mental State Examination (MMSE). Multiple regression analysis was used to identify factors predicting severity of depression. Results: The prevalence of depression in AD/VD was 87%. In comparison to the general population, HrQoL measured on the visual analogue scale was reduced by 54% in patients with AD/VD. In the dimension “anxiety/depression” of the EQ-5D, 81% of patients with AD/VD had moderate or severe problems. Depression showed significant association with reduced HrQoL (P < 0.01). Independent predictors of more severe depression were older age, male gender, better MMSE scores and being not married. Conclusions: Depression is a prevalent psychiatric co-morbidity in patients with AD/VD, which is often under-diagnosed being masked by cognitive impairment. Depression is a predictor of reduced HrQoL in elder people with AD/VD. Therefore, they should be screened for presence of depressive symptoms and receive adequate antidepressant treatment.
Watering flowers in the rain: The elusive nature of executive dysfunction in HIV
Authors: Lewis Elizabeth L , Lawler Kathy
Published: May 2011

Individuals infected with human immunodefi ciency virus (HIV) frequently experience both neurocognitive and psychiatric dysfunction. Apathy is a prominent neuropsychiatric symptom associated with HIV and is related to neurologic dysfunction. In contrast, depression is independent of neurocognitive impairment in HIV. This case report illustrates the importance of behavioral observations from family members of HIV-positive (HIV+) individuals as a valuable source of information. These behavioral observations can be particularly important in rural resource-limited settings, where cognitive testing is often limited to standardized mental status examinations.
Correlative study between neuron-specifi c enolase and blood sugar level in ischemic stroke patients
Authors: Pandey Aparna , Verma Meena , Bharosay Anuradha , Saxena Kiran
Published: May 2011

Background: A study to investigate the level of the neurobiochemical marker, Neuron-Specific Enolase (NSE), at the time of admission and its correlation with the blood sugar level in ischemic stroke patients. Patients and Methods: We investigated 90 patients with complete stroke who were admitted to the Stroke Unit of the Department of Neurology at Sri Aurobindo Institute of Medical Sciences. NSE was measured with commercially available quantitative 'sandwich' enzyme-linked immunosorbent assay kits obtained from R and D Systems. Hyperglycemia was defined as blood glucose concentration ≥ 7 mmol/L, and measured using the glucose oxidase method immediately. Results: Significantly increased NSE and lipid profile levels were found in ischemic stroke patients as compared to the control. Hyperglycemic ischemic stroke patients had increased levels of NSE, lipid profile, and National Institute of Health stroke scale scores (NIHSS score) compared to normoglycemic ischemic stroke patients. In addition the serum NSE level of hyperglycemic stroke patients was also positively correlated with the blood sugar level (r = 0.734 P < 0.001). Conclusions: Hyperglycemia predicts an increased risk of poor outcome after ischemic stroke and it is reflected by a significantly increased level of Neuron-Specific Enolase.
Dolichoectasia of vertebrobasilar arteries as a cause of hydrocephalus
Authors: Kansal Ritesh , Mahore Amit , Dange Nitin , Kukreja Sanjay
Published: May 2011

Dolichoectasia of vertebrobasilar artery is a condition in which the vertebral/basilar artery is elongated, distended and tortuous. It is usually asymptomatic. It may present with compressive or ischemic symptoms. Hydrocephalus as a complication of vertebrobasilar dolichoectasia is rare. We present a case of a 60-year-old male with dolichoectasia of the basilar artery causing compression of the third ventricular outflow and, thus, presenting with noncommunicating hydrocephalus.
Horizontal canal benign paroxysmal positional vertigo in a fighter pilot
Authors: Xie Su-Jiang , Wang Jiang-Chang , Ding Li , Xi-Qing Sun
Published: May 2011

Benign paroxysmal positional vertigo (BPPV) is the most common disorder of the peripheral vestibular system, characterized by intense, positional provoked vertigo. BPPV is thought to occur due to canalithiasis of the posterior semicircular canal. Recently, a new entity of BPPV, known as horizontal canal (HC)-BPPV, has been recognized. Although only 3 to 8% of BPPV is due to horizontal canal involvement, HC-BPPV is not rare. We present a case of a naval fi ghter pilot who had an incident of HC-BPPV on the ground. The pilot aeromedical evaluation and considerations are discussed.
Tuberculous meningoencephalitis with severe neurological sequel in an immigrant child
Authors: Yasar Kadriye Kart , Pehlivanoglu Filiz , Sengoz Gonul , Ince E Rahsan , Sandikci Semra
Published: May 2011

Central nervous system tuberculosis (TB) is the most devastating manifestation of TB. It is a challenge for clinicians because of the diffi culty in making an early diagnosis and the severe consequences of delayed treatment. The aim of this report is to point out the relation between migration and TB based on a 14-year-old child with tuberculous meningoencephalitis (TBM) of an immigrant family. Migration, crowded living conditions and positive family history contribute to the severe course of TB as TBM and miliary TB forms. TB control may prevent these severe manifestations of the disease among immigrants. Prompt diagnosis with helpful early diagnostic tools like polymerase chain reaction
in TBM is crucial due to the high mortality and morbidity.
Imaging of Mechanical Cardiac Assist Devices
Authors: Ginat Daniel , Massey Howard Todd , Bhatt Shweta , Dogra Vikram S
Published: May 2011

Diagnostic imaging plays an important role in the assessment of patients with mechanical cardiac assist devices. Therefore, it is important for radiologists to be familiar with the basic components, function, and radiographic appearances of these devices in order to appropriately diagnose complications. The purpose of this pictorial essay is to review indications, components, normal imaging appearances, and complications of surgically and percutaneously implanted ventricular assist devices, intra-aortic balloon pumps, and cardiac meshes.