bluuebunny/crossref_metadata_2025 huggingface dataset:
The Embedded Audio Coding of Algebraic Quantization Based on the Transform Coefficients
Authors: Tang Gang
Published: February 2012

This paper proposes a new quantitative method called the transform coefficients, which is based on the algebraic quantization method. This coefficient is defined as a unique amplitude multiplied by a number of pulses.In order to determine the signs of pulse, location and amplitude, we selected the transmission coefficient by adopting an ideal standard errors. This simple quantification has been implemented in scalable coding of microwave transform, and has been proved that its voice signal and music effect is better than that of the SPIHT.
Study on the Integration Technology of After-Treatment System of the Diesel of Heavy-Duty Machinery
Authors: Tian Ye , Qu Da Wei , Wang Lian Xu
Published: February 2012

In order to be friendly to environment,the mechanical engineering meet new challenge. It should not only ensure high efficiency, low fuel consumption, but also ensure low emissions, which can achieve the purpose of green manufacturing. Under these conditions, the emission regulations are developed by different governments. Euro VI emission is developed by EU, in order to meet it, it will be necessary to apply the integration technology of after-treatment system for reducing of both PM and NOx. Different kinds of integration technology are described. The Ammonia slip catalysts (ASC) which must be used to reduce NH3 is also introduced.
Modeling and Analysis of Three-Parameter Power Shift Schedule for Pure Electric Bus of AMT
Authors: Luo Li Peng , Xi Jun Qiang , Liu Xing Long , Hu Yu Hui
Published: February 2012

The design of shift schedule is of great importance for the drivability of vehicular automatic mechanical transmission. Currently, the most widely used is two-parameter shift schedule, but it ignores the influence of dynamic conditions and ramp conditions. In this paper, a three-parameter power shift schedule based on vehicle speed, acceleration and throttle angle has been proposed, which makes the vehicle have the best performance in all kinds of slope surface. Then the vehicle model is established by Cruise and Matlab/simulink. The simulation results show that the three-parameter power shift schedule can effectively enhance the vehicle dynamic performance.
Discussion on the Optimization Design of Feature Extraction Methods of the EMG Signal
Authors: Lou Zhi
Published: February 2012

This paper introduces a digital signal processor based system design, through the computer acquisition individuals EMG(Electromyographic)signal data to monitor the dynamic activity of muscles, and the estimation of normal and pathological conditions of the acquired data of the power spectrum. In the collection system, the input signal of the two differential amplifier signal preprocessing and obtain the EMG signal linear feature. Obtain electromyographic signal is then digitized, and transmitted to the computer analysis. The optimization system for detection and Analysis on the clinical diagnosis of human functional status and rehabilitation has important significance.
Exploration on Infiltrating Human Education in the Basic Chemistry Courses of Science and Engineering
Authors: Han Lai
Published: February 2012

This paper analyzes the inevitability to infiltrating human education in the basic chemistry course of science and engineering and explores the methods of it. Its purpose is to make the students have good humanistic quality to encourage their comprehensive development while master the chemical knowledge.
Design of Sand Washing and Plug Removal Device with High Pressure Foam Fluid Jet
Authors: Cai Wen Bin , Qin Guo Wei , He Yan
Published: February 2012

In the oil and gas production process, serious sand production causes reservoir and pipe blocked, which makes productivity declined, even stopped. It's the efficient means of sand washing and plug removal by using high-pressure foam fluid jet. The structure and performance of sand washing device determines the efficiency of sand washing and plug removal. The device's nozzle consists of anti-blocking valves, three kinds of nozzles with self-drive, rotation characteristics during the operation. The nozzles include sand washing nozzle, couple nozzle and power nozzle. This device can be used in horizontal wells with complex well bore situation to carry out sand and plug removal. The device has a good effect on sand washing and plug removal in the oil field.
Study for Traditional Spinning Wheels and Looms in ZE Zhou Region
Authors: Lu Wei , Yang Xiao Ming
Published: February 2012

"LU silk"was a traditional silk, which was from the southeast of Shanxi province, and prevailed in Ming and Qing Dynasty. However, “LU silk” blended in the local traditional culture with its unique skills. In this article, we apply field archaeology and oral history methods; the thesis gives a brief summary to the existing spinning wheels and looms in ZE Zhou region. Based on the investigation of weaving skills of “LU silk”, we try to explore the traditional silk-weaving skill, its profound historical and cultural background and rich realistic significance of the southeast of Shanxi province.
Separating Nonstationary Powerline Interference from ECG Using Empirical Mode Decomposition
Authors: Li Guo Jun , Hao Xiao Jie , Zhong Hui , Zhou Xiao Na
Published: February 2012

Powerline interference (PLI) is a significant source of noise in Electrocardiogram (ECG). It often exhibits variations in frequency and amplitude along with relatively lower level than that of ECG signal in battery-operated ECG system, whose separation remains a challenging task. The use of masking signal-aided empirical mode decomposition is presented to deal with this problem in this study. Simulation results show that our method can effectively decompose the time-varying PLI into a single intrinsic mode function (IMF) at various interference levels.
The Research of the Wheel Loader Working Device
Authors: Zhang Wei Wei , Zhou Jun , Deng Jian Xin
Published: February 2012

On the background of increasing demand of construction machinery, the requirement of energy saving without affecting performance, safety and reliability put great pressure on engineering staffs. A comprehensive grasp of the whole system in constitution and working principle exactly helps designers in control and modifications theoretically. Evaluations and discusses in this article are based on a model in Simulation X, and variable geometry parameters in the system model make the matching of desired result easily. A successful model build for working devices of the wheel loader, and all technical result can be acquired easily in the soft ware, the result curves can easily revealed the requirement of optimizing the design of the whole machine.
Simulation Analysis of the Anti-Settlement Dehydration of the Phosphate Ester Fire-Resistant Oil Based on Lab VIEW
Authors: Zhang Xian Ming , Yuan Jian , Chen Bin , Lu Hao Wen
Published: February 2012

The anti-settlement dehydration process of the phosphate ester fire-resistant oil is analyzed with Lab VIEW which is a kind of graphical programming language. It describes the process of the anti-settlement dehydration of the fire-resistant oil and compiles the simulation program, find the movement feature of the droplet and the operation mechanism of the system in the process of the anti-settlement. It is a foundation for further enhancing the dehydration of the anti-settlement method to fire-resistant oil.
Effect of CeO2 on Microstructure and Hardness of Roller Surface Alloyed by Laser
Authors: Yue Huai Jun , Liu Qi Bin
Published: February 2012

To improve the service performance of roller. The surface of roller was alloyed by a 5kW CO2 laser. The effect of CeO2 on microstructure and hardness was studied by means of OM, Micro-hardness Testing Machine and Rockwell hardness tester. The results indicate that addition of CeO2 into coating materials can enhance the fluidity of molten liquid, refine and purify microstructure and increase microhardness and surface hardness of alloying coating.
Empirical Research on Comprehensive Materials Multimedia English Classroom
Authors: Wang Yu Qing
Published: February 2012

With the rapid development of multimedia technology, the comprehensive materials multimedia has become the development trend of college classroom. This paper starts from the analysis on the difficult points of college English classroom, takes the college non-major classroom as the research subject, compares the traditional teaching with comprehensive materials multimedia and makes empirical research, and then purposes the corresponding countermeasures and suggestions, so as to provide scientific basis for the development of comprehensive materials multimedia English classroom at this college.
Effect of Different Grinding Time on the Performance of Gypsum Mould
Authors: Chen Chao , Gu Xing Yong , Chen Yun Xia , Luo Ting
Published: February 2012

In order to improve the performance of gypsum mould, dry grinding process was applied to the pretreatment of gypsum powder and the effect of the ball-milling time on the performance of gypsum powders was mainly studied in our work. X-Ray powder diffraction (XRD) and scanning electron microscope (SEM) were employed to characterize the phase compositions and microstructures of gypsum mould. The results show that the initial and final setting time of gypsum slurry reduces with the increasing of ball-milling time. But the initial and final setting time changed slightly when the ball-milling time was extended to 1 hour or more. Furthermore, the water absorption of gypsum moulds made by the pre-grinded gypsum powders was increased by 42.0 percent in the case of 2 hours’ grinding time, yet the flexual strength of the mould was slightly decreased by 12.5 percent. The main phase of gypsum powder was unchanged, but decrystallization degree increased after dry grinding process. Meanwhile, the crystal orientation and particle aggregation of the gypsum powders were destroyed, and the particle length of that was shortened. As a result, the gypsum moulds obtained by the as-treated gypsum powders have high porosity and water absorption.
ELID Grinding Technology of Nano-Material Cutting Tool
Authors: Kuai Ji Cai , Zhang Fei Hu , Liu Ya Zhong
Published: February 2012

As ELID grinding technology is characterized by simpleness, practicality, low cost and so on, it is wildly used in ultra-precision sharpening, ultra-precision grinding, ultra-precision polishing and some other fields of difficult-to-cut material. ELID grinding technology was applied in the grinding of cutting tool in this paper, and the cutting tools with nano-grained cemented carbide, common cemented carbide, nanoY-TZP ceramics and some other materials were respectively grinded. Then, the surface quality of their anterior and posterior grinding horns and their edge radius were studied and compared with traditional grinding technology of cutting tool. The results show that the surface roughness and edge radius of nano-grained cemented carbide cutting tool are respectively Ra2nm and 0.3μm, the surface roughness and edge radius of common cemented carbide cutting tool are respectively Ra20nm and 1μm and the surface roughness and edge radius of nanoY-TZP ceramic cutting tool are respectively Ra60nm and 0.2μm after grinding by applying ELID grinding technology, which are far better than that from traditional grinding technology; this further proves that the adoption of ELID grinding technology in the grinding of cutting tool is feasible.
Influence of Negative Bias Voltage on the Microstructure and Tribological Properties of CrTiAlN Composite Films
Authors: Cai Zhi Hai , Di Yue Lan , Yang Zhen , Zhang Ping
Published: February 2012

By using the multi-ion plating,the CrAlTiN composite films were made on the suface of piston rings to improve its tribological properties and increase service life. The effects of negative bias voltage on morphology, hardness, adhesion strength, microstructure and tribological properties were studied. The results show that the morphology, phases, hardness, adhesion and wearability of the films were varied with negative bias voltage. When the negative bias voltage was at -200V, the hardness, adhesion strength of CrTiAlN coatings reaches maximum and the surface roughness, weightlessness for CrTiAlN composite coatings reaches minimum. And the conclusion can be obtained that the key factor which influences the wearability of the films are the function of the crystal size and adhesion strength together.
Research on Genetic Characteristics of Slab Bulge in Continuous Casting Process
Authors: He Chong Yang , Wu Di Ping , Qin Qin
Published: February 2012

Bulge deformation is an important factor that causes inner crack and declines the quality for slab. This has a significant genetic phenomenon in continuous casting process. In order to explain this feature, a two-dimensional FEM model for slab that includes viscoelastic and dynamic characteristic has been built. Positive creep and reverse creep were introduced to explain this mechanism. Roll pitch, shell characteristic, slab withdrawing speed and other process parameters that influence bulge’s genetic level are discussed. A nonlinear equation was suggested to describe the relationships between these factors and genetic level of bulge.
Estimate Method of Web-Based Distance Education for the Deaf Undergraduate
Authors: Zhao Yuan Jing , Li Qiang , Wu Yang , Wang Xiao Ou
Published: February 2012

Though using estimating the model for the deaf on web-Based distance education on the features and requirements of web-education, this paper designs a teaching evaluation model for the deaf on web-based distance education. It is in order to introduce the model, and introduces it on various aspects of web-teaching’ features and evaluation process.
EWOD-Based Digital Microfluidic Chip and its Application
Authors: Chang Yin Xia , Zhang Si Xiang , Li Jian Yi
Published: February 2012

As a new technology, digital microfluidic chip based on EWOD (Electrowetting on Dielectric) has good prospect of application in biological, medical, chemical and optic fields. Firstly, the working principle is introduced. Then the major application domains are summarized. Finally, the key problems in design and two fabrication methods are discussed, the clean-room-processing chip is more precise and PCB(Printed Circuit Board) chip is cheaper. New technologies developed in these fields speed up the step from lab to commercial application.
Performance Calculation of a TBD234V12 Diesel Engine with STC
Authors: Wang Yang , Wang Yin Yan , Shi Fan , Li Xin Guang
Published: February 2012

A computer model for a TBD234V12 marine high-speed diesel engine with 2 turbocharger(2TC) is built on GT-POWER. For validating the computer model, a calculation to the conventional turbocharging system has been done firstly, and the results show good agreement with experimental data. The computer model has then been used for predictive studies of the diesel engine with the proposed STC system on the mapping characteristics. From these results, it can be seen that the STC system can not only improve the part load performance of the diesel engine obviously, but also enlarge the operating range of the marine diesel engine.
A Case Study of Earthquake Resistant Retrofit Design with Economical Braced Steel Frame System for a Primary School
Authors: Shiah Guan Chyun , Liu Chia Lun
Published: February 2012

This paper makes a case study of an elementary school in Feng-shan District, Kaohsiung City. According to “The handbook of seismic resistant evaluation standard for school buildings” issued by National Center for Research on Earthquake Engineering (NCREE) in 2009, this study analyzes elementary school building adopting braced steel frame retrofit system, conducts seismic evaluation, as well as compares its seismic performance with shear-wall retrofit structure and RC strengthening of columns . If space permits, braced steel frame retrofit system can be applied into school building retrofit scheme; its seismic performance is compared with shear wall and RC strengthening of columns proposals. Adopting shear wall or RC strengthening of columns retrofit would affect main structure system of school building. These constructions will make existing reinforced concrete school building crack, especially old school building whose structure strength is greatly influenced. Therefore, an economic braced portal frame systems are proposed as new way of retrofitting. This paper uses ETABS program to make a seismic evaluation for structural system of the study object. It also compares the research object with commonly-used shear wall retrofit and RC strengthening of columns retrofit, thus to judge whether it meets requirements stipulated in seismic standards issued by NCREE and provide an another alternative scheme for the primary school retrofit construction.
The Study of Carrier of Aerial Afforestation Design
Authors: Hu Yu Jen , Tsai Ya Ting , Tsai Ming Chi , Yen Ching Ho , Ke Jyh Bin
Published: February 2012

In this study, we use the single-winged seeds flying model to study the relevant parameters. Afforestation used as sowing carrier stay in the air spill design to improve sowing distance. This study is further implemented the method currently carried out by Forestry Bureau for afforestation and soil conservation. This study is funded by the relevant principles of fluid dynamics to explore: physical analysis of the five seeds. Reads as follows: (1) structure and trajectory, (2) advance ratio, (3) lift thrust vs. pitch angle, (4) loading vs. terminal velocity, (5) cut-off angle area.. Finally, this study design some carrier models for testing. Spill sowing the spacing and the drift distance experiment analysis results. With experimental data, (shown in Table 2). This research used easy materials that you can make a lot. Fluid mechanical principles could be excellent learning materials for children to explore the use of teaching aids.
OPC UA Discovery: A Study of Challenges and Perspective
Authors: Son Mai , Yi Myeong Jae
Published: February 2012

In the OPC Unified Architecture specification, Discovery is the important part which contains the solution for finding OPC UA Servers in enterprise system. Finding target is considered as the first step of communication. Even though OPC UA Servers (UA Servers) provide extensive functionalities and data, it is largely ineffective if the UA Servers cannot be discovered for later use. This paper aims at leveraging OPC Discovery concept, has been being developed by OPC Foundation, by using WS-Discovery to overcome main challenges: (i) Discovery process is still static and need improving, (ii) embedded OPC UA devices become more and more popular, discovery mechanism need extending for them, and (iii) discovery process is being tied in one domain, it needs extending for cross-domain case as well.
Some Qualitative Properties of Modes of Continuous System of Two-Spans Beam with Two Free-Ends
Authors: He Min , Zhang Li Hua , Wang Qi Shen
Published: February 2012

In this paper we gave the conjugated system of the two-span beam with two free-ends, which is a continuous system of two-spans continuous beam with two clamped-ends. The oscillating property of the conjugated system is proved. And the sign interchanges number of the flexural moment modes are determined. Furthermore, some qualitative properties owned by its displacement modes, rotation modes, moment modes and shearing force modes are given.
Amplitude Incremental Generalized Potential Energy Principles with Two Kinds of Variables for Nonlinear Vibration
Authors: Liu Zong Min , Sun Bai Tao , Zhang Gui Xin , Zhang Yuan Yuan
Published: February 2012

For nonlinear vibration problems, IHB method is an effective definite quantitative method. The theoretical foundation of IHB method is amplitude incremental variational principle. In this paper, amplitude incremental generalized potential energy principle and generalized quasi-potential energy principle with two variables are established, thus improving theoretical foundation of IHB method.
Seismic Behavior of Precast Segmental Bridge Columns with Carbon Fibre Reinforcement as Energy Dissipation Bars
Authors: Wang Ya , Bu Zhan Yu , Hu Lei
Published: February 2012

Precast construction is prevailing from China to America and Europe for its advantage in shortening construction schedule, mitigating environment pollution and reducing life cycle costs. Precast segmental bridge columns are a new structural system, whose widespread to high seismicity is slow due to concern of their seismic response. Carbon fibre reinforcement is a new material with high strength and well corrosion protection. The purpose of this contribution is to explore the applicable of carbon fibre reinforcement in reducing seismic damage and enhancing the lateral bearing capacity in precast concrete columns. The effect of partial steel reinforcement energy dissipation bars being replaced with carbon fibre bars in precast segmental bridge columns was investigated. The simulation model was proved valid by comparison with pseudo static test results. Then parametric study of amount of carbon fibre on the force-displacement curve, damping ratio, energy dissipation and joint opening was conducted. The results show the carbon fibre reinforcement is applicable in precast segmental bridge columns with competitive response behavior over its mild reinforcement counterpart.
Research on High-Frequency Vibratory Stress Relief of Small Cr12MoV Quenched Specimens
Authors: He Wen , Gu Bang Ping , Zheng Jian Yi , Shen Run Jie
Published: February 2012

Considering that most of the research on vibratory stress relief (VSR) is excited by low-frequency vibration at present, high-frequency-exciting VSR on small Cr12MoV quenched specimens was studied. A high-frequency vibration table system was adopted as the exciter of the VSR. To increase the vibration level, a novel vibration level amplifying device was put forward. High-frequency VSR on the same group of small Cr12MoV quenched specimens was carried out under various vibration levels. The residual stress before and after vibration was comparatively analyzed. The results showed that the high-frequency vibration had the better effect on eliminating and homogenizing the residual stress and that increasing the vibration level of high-frequency-exciting could improve the effect of high-frequency VSR.
Investigation of Viscoelastic Deformation and Constitutive Modeling of PC, ABS and PC/ABS Alloys
Authors: Yin Z.N. , Wang T.J.
Published: February 2012

Dynamic Mechanical Analysis (DMA) tests are carried out to investigate the viscoelastic deformation of Polycabonate (PC), Acrylonitrile-butadiene-styrene (ABS) and PC/ABS alloys with ratio of PC to ABS being 60/40, 50/50, 40/60, respectively. Storage and loss moduli of PC, ABS and PC/ABS alloys are measured from 0.01Hz to 200Hz at 95oC with DMA tests. The relaxation moduli of PC, ABS and PC/ABS alloys are tested from static tests and compared with those calculated from storage and loss moduli. Effect of ABS fraction on storage and loss moduli and relaxation modulus of PC/ABS alloys is also discussed.
The Method and Technique of 2D Drawing Creation Based on NX7.5
Authors: Zhan Xiang Hui , Li Xiao Da
Published: February 2012

The method and technique of the 3D model transformation for 2D engineering drawing using NX7.5 was studied. The key points of GC china toolkits, method of master model and pattern were introduced. The GC china toolkits produced convenient way to custom drawing standard to match China standard through some simple operation. The method of master model realized the relativity between 3D model and 2D drawing. The pattern was an effective method to add drawing frame and title bar to sheets. In the end, the process of 2D engineering graphics creation was expatiated. The practice case proves that the drawing efficiency is improved greatly by NX7.5 application.
Innovative Wavy Bolts and their Supporting Mechanism for Burst Prone Rock Masses
Authors: Zhou Zi Long , Li Xi Bing , Ma Chun De , Zou Yang , Yin Tu Bing
Published: February 2012

A new type of bolt with wavy body has been designed for the supporting of burst prone rock masses and turned out to be a great success. To reveal its working mechanism, static and dynamic analyses have been carried out. Firstly, static pull-out investigations show that wavy body of the bolt has largely improved its deformation capability. Then, vibration modes and corresponding frequencies of wavy bolts and traditional point anchored bolts are obtained respectively by mode analyses. It is revealed that, at the same exciting frequency range, more vibration modes, especially the axial vibrations, can be excited for wavy bolts than for traditional bolts. Furthermore, Analyses on wave interaction between bolt and rock masses show that the energy catcher function of wavy bolt cluster is vital for its excellent supporting effect in burst prone rock masses.
Research on Multilevel Inventory Control of FMCG Industry Based on System Dynamics
Authors: Yang Bin , Li Shu Qin , Zhang Chao
Published: February 2012

In this paper, the method of system dynamics is applied for the supply chain inventory management in FMCG industry. Based on the analysis of three-level supply chain inventory control loop, this paper establishes system dynamic models related profits and the service level of 2&3-level supply chain. After testing the validity of the model, the writer does some simulation through the system dynamics software Vensim．In addition, the model and simulation described in the paper are highly understandable and practicable, and thus have a very good prospect of application.
Research on the Energy Consumption Evaluation Model of Container Terminal Logistics System
Authors: Yang Bin , Guo Yuan Yuan , Shi Xu , Lu Yang Yang
Published: February 2012

In this paper, energy consumption evaluation index system of the container terminal logistics system is briefly studied. Energy consumption is divided into two parts as dynamic and static energy consumption. Then an effective energy consumption evaluation model of container terminal logistics system is established.
Surface Roughness Prediction Model of Cylinder Grinding
Authors: Ding Ning , Wang Yi Chen , Zhang Ding Tong , Shi Yu Xiang , Shi Jian
Published: February 2012

Based on the theory of roughness during cylinder grinding and the theory of fuzzy-neural network, a surface roughness intelligent prediction model is developed in this paper. The feed, speed, and the vibration data are the inputs for the model. An accelerometer is used to gather the vibration signal in real time. The model is used in the grinding experiment, and verifies the feasibility of the proposed model.
Research on the KII C of the Two Types of Concrete Specimens
Authors: Deng Ai Min , Xu Dao Yuan , Zhu Wei Xuan
Published: February 2012

According to the mode II fracture test results of the concrete of the double-edge notched specimens with four-point shear loading and half symmetrical loading, the relationship of the mode II fracture toughness of two type of concrete specimens are analyzed. Based on the numerical simulation, the stress field near the crack tip is analyzed by use of the finite element method, and the mode II fracture toughness of the two types of concrete specimens are calculated with the displacement extrapolation method, and the difference with the experimental results are studied. Because of the uniform stress of the specimen with half symmetric loading, and the shear stress in the fracture process zone is much larger than the first principal stress during the entire test process, while the phenomenon of opening and torsion of the surface of cracks may appeared at the four point shear loading conditions, which leads to the fracture process of the specimen is not always the mode II fracture of pure shear.
Block Compressed Sensing Based on Image Complexity
Authors: Cao Yu Ming , Feng Yan , Jia Ying Biao , Dou Chang Sheng
Published: February 2012

Compressed sensing (CS) is a new Compressed sensing (CS) is a new technique for simultaneous data sampling and compression. Inspired by recent theoretical advances in compressive sensing, we propose a new CS algorithm which takes the image complexity into consideration. Image will be divided into small blocks, and then acquisition is conducted in a block-by-block manner. Each block has independent measurement and recovery process. The extraordinary thought proposed is that we sufficiently take advantage of image characteristics in measurement process, which make our measurement more effective and efficient. Experimental results tell that our algorithm has better recovery performance than traditional method, and its calculation amount has greatly reduced.
Study on Application of Wireless Sensor Networking in Environmental Monitoring
Authors: Liu Yan Ju , Li Xin Hua
Published: February 2012

A novel wireless sensor networks is designed with integrating sensors, embedded operating systems and wireless networking technology. The temperature, humidity, light strength and pressure around the sensor could be measured accurately. The collected data by sensor networks are analysed and treated in PC computer via USB interface. LEACH communication protocol was introduced to ZigBee networks in this paper. The node programs were exploited based on IAR System platform to accomplish data collection.
Helium-Injection Cooling of Hot Silica Glass Fiber in Optical Fiber Manufacturing System
Authors: Kim Dong Joo , Oh Il Seok , Kwak Ho Sang , Kim Kyoung Jin
Published: February 2012

In an optical fiber manufacturing process, glass fibers drawn from the heated silica preform in the furnace should be sufficiently cooled down close to ambient temperature. As the fiber drawing speed continues to increase for better manufacturing productivity, the glass fiber cooling becomes more difficult and the use of helium injection into the glass fiber cooling unit is required to greatly enhance the fiber cooling effectiveness. The present study numerically simulates the flowfield and heat transfer phenomena on the glass fiber cooling in order to investigate the effects of helium injection and fiber drawing speed on the fiber cooling effectiveness of glass cooling unit. The results found that the amount of air entrainment at the unit inlet is the significant factor that decides the cooling effectiveness by significantly lowering the helium purity in cooling gas. Also, at a given fiber drawing speed, there exists a critical helium injection rate and the fiber cooling does not improve any more, even if the helium injection rate increases above this critical value.
Duplex Hard Coatings with Aditional Ion Implantation
Authors: Skoric Branko , Kakaš D. , Favato G. , Miletić A. , Arsenovic M.
Published: February 2012

In this paper, we present the results of a study of TiN thin films which are deposited by a Physical Vapour Deposition (PVD) and Ion Beam Assisted Deposition (IBAD). In the present investigation the subsequent ion implantation was provided with N2+ ions. The ion implantation was applied to enhance the mechanical properties of surface. The thin film deposition process exerts a number of effects such as crystallographic orientation, morphology, topography, densification of the films.. A variety of analytic techniques were used for characterization, such as scratch test, calo test, Scanning electron microscopy (SEM), Atomic Force Microscope (AFM), X-ray diffraction (XRD) and Energy Dispersive X-ray analysis (EDAX).
Relation between Cubic Stiffness and Initial Conditions of Maximum Energy Dissipation in a Nonlinear Vibration Absorber
Authors: Kong Xian Ren , Zhang Ye Chi , Shan Xiao Wei
Published: February 2012

A novel technical finding is proposed based on the analytical study of the underlying conservative system of a small mass nonlinear vibration absorber coupled with a main structure. For the system with linear damping under impulsive excitation, a result is obtained that the initial energy for inducing maximum dissipation of energy in the nonlinear attachment is inversely proportional to the cubic stiffness. The technical point coincides with massive numerical simulations precisely. This relationship between the cubic stiffness and the initial conditions facilitates the tuning of a nonlinear vibration absorber for realizing optimal targeted energy transfer.
A Robust Tracking Algorithm in Crowded Environment
Authors: Jiang Ming Xin , Wang Hong Yu
Published: February 2012

Reliable tracking of multiple people in cluttered or complex situations is a challenging visual surveillance problem since the high density of objects results in occlusion. In order to deal with this problem, multiple synchronized cameras were mounted at various heights in our experiment. To ensure the existence of the homography, it is necessary to assume that different views share a common dominant ground plane. Thus, corresponding people have to be located within the multi-camera surveillance system, accurate multi-people localizing is an important prerequisite to reliable tracking. In this paper, we present a novel approach to fusing foreground information on planes of different height from multiple views to increase accurateness of localization. Our method does not require fully camera calibration. First we obtain the foreground likelihood maps in each view by modeling the background using codebook algorithm. Then we compute homographies induced by multiple planes and obtain the localization of multiple people at multiple planes. Finally, we adopt an algorithm of feature-based using Kalman filter motion to handle multiple objects tracking at multiple plane. The experimental results show that our method is valid and has nice robustness to the occlusion in crowed environments.
The Research of WSN Time Synchronization Algorithm Based on Clustering Network
Authors: Shang Yuan Yuan , Wan Zhou , Zhang Xue Hua , Jing Zhong Guo , Xiong Xin
Published: February 2012

In order to solve time synchronization problem of wireless sensor network, combined with the broadcast characteristics of wireless transmission and bi-directional message mechanism and the characteristics of clustering network, this paper presents an improved time synchronization algorithm HLTN based on clustering network and the simulation experiment by NS-2 simulation platform and analyzed the results.
An Audio Watermark Algorithm in Wavelet Domain Based on SVM
Authors: Wang Yong Qi , Deng Chen
Published: February 2012

This paper proposed an audio watermark algorithm with synchronization in wavelet domain based on support vector machine. The synchronization code and encrypted digital watermark are embedded into the low frequency coefficients in DWT domain by using quantization modulation, the image watermark and the synchronization code are extracted through SVM possessing two-class problem. The experimental results show that the audio watermarking scheme is inaudible, but also robust against noise adding, filtering, random cropping attacks.
The Prediction and Analysis of Water Resource Carrying Capacity in Chongqing Metropolitan, China
Authors: Ming Li
Published: February 2012

The fast urbanization in Chongqing metropolitan has had a great impact on the environment and resources. The water resource has been recognized as one of the key elements to the sustainable development of this region. This paper presents a method of predicting the regional Water Resource Carrying Capacity (WRCC) using the supply-demand balance model. The method predicts that the WRCC of Chongqing metropolitan is from 8.8 million persons to 14 million persons in 2020 and it will not become the bottleneck of the social and economic development of Chongqing Metropolitan in the coming period of time. However the climate change and its impact on the regional ecology will have an effect on it. The results show that the usable capacity of Passing-by water is the most important element of the WRCC of Chongqing metropolitan therefore the protection of the ecological environment in the upstream area is very important. This paper has proposed tangible advice on the sustainable social and economic development in context of water resource.
Airborne Single Observer Passive Tracking Algorithm Based on Improved CS Model
Authors: Li Wang Xi , Huang Chang Qiang , Wang Yong , Xuan Yong Bo
Published: February 2012

Aim at solving the problem that the target may exceed acceleration limit, a new passive tracking filtering algorithm based on “Current” Statistical (CS) model has been proposed. By designing nonlinear fuzzy membership functions, the new “Current” Statistical model filtering algorithm can adaptively adjust the acceleration upper and lower of CS model. Monte Carlo simulations of maneuvering targets show that the NCS algorithm has a better performance than the traditional CS algorithm.
An Analytic Method and Application on Design Planar Six-Bar Mechanisms with an Approximately Equal Velocity Ratio Transmission
Authors: An Shu Nü , Wang Hong Xin
Published: February 2012

An analytic design method on an approximately equal velocity ratio transmission mechanism is presented. The mathematical principle is that a compound function produced by two basic functions, let its one order differential is equal to an assigned constant on the special point, and then two to three order derivatives of the compound function are all zeroes, thus one algebraic equation is got, its solution defines the mechanism dimensions. This a principle not only sets up a new design method on approximately equal velocity ratio mechanisms but approximately equal velocity is independently designed. A design example shows that this method is simpler and transmission characteristics are better than optimization method.
A Mathematical Modeling and Optimization Approach for Trajectory Planning of Robot Manipulators
Authors: Guo Jin Chao , Liu Zheng , Cui Guang Zhao
Published: February 2012

This paper presents a method for the problem of optimal trajectory planning of redundant robot manipulators in the presence of fixed obstacles. Quadrinomial and quintic polynomials are used to describe the segment of the trajectory. Cultural based PSO algorithm (CBPSO) is proposed to design a collision-free trajectory for planar redundant manipulators. CBPSO optimizes the trajectory and ensures that obstacle avoidance can be achieved. Simulations are carried out for different obstacles to prove the validity of the proposed algorithm. Different test data generated by GA, QPSO and CBPSO are provided with a tabular comparison. Simulation studies show CBPSO has potential online usage in engineering and distinct fast computation speed compared with the other two algorithms. Results demonstrate the effectiveness and capability of the proposed method in generating optimized collision-free trajectories.
Background Modeling Approach Based on Eigenspace Decomposition
Authors: Long Jian Wu , Shen Xuan Jing , Chen Hai Peng
Published: February 2012

In this work principal component analysis (PCA) was adopted to construct a background model and moving objects were detected by background subtraction method. Firstly, constructed the matrix of training samples by means of converting the video sequence to vectors. Then calculated the covariance matrix C of the training set, and acquired the eigenvalues and eigenvectors of C through SVD decomposition. Next, sorted the eigenvalues and reconstructed the background model by using several image vectors which had higher cumulative contribution. Finally, comparison experiments are performed with the detection results by GMM approach. Experimental results show that the proposed method in this paper could establish background models more accurate and have better effective of object detection.
Concrete Damage Constitutive Relation Based on Characteristic Parameters of Acoustic Emission
Authors: Lu Jun , Hu Shao Wei , Fan Xiang Qian
Published: February 2012

Based on the experiments, the parameters of acoustic emission signals were discussed about cracks, expansion and instability of concrete in this paper. The relationship between different acoustic emission signals of concrete were established on damage constitutive relation. A new method was provided by damage assessment for hydraulic structures.
Long-Distance Slurry Pipeline Valve Monitoring System Design and Application
Authors: Yuan Xu Yi , Wu Jian De , Fan Yu Gang , Wang Xiao Dong
Published: February 2012

For the complex terrain, in long-distance slurry pipeline, the core equipment of the running pipeline - valve monitoring is particularly important. This paper based on the actual running conditions of Yunnan Dahongshan pipeline, developed an intelligent valve control system. Valve monitoring and management can be seen in this system, which combines software programming, measurement technology, communication networks, as well as order management, fault management, spare parts management, query statistics. Getting running parameters rely on the monitoring system, and then for the mathematical model of solid traffic in slurry pipeline transportation, the slurry weight can be measured. The system achieved valve monitoring and management very well, improving the long-distance slurry pipeline running reliability.
A Prototype Target Tracking Network System for Robot Feedback Control
Authors: Zhao Ling , Ye Jing Zhi , Luo Wen Feng
Published: February 2012

In this paper, a real-time location feedback control system based on multi-sensor network is proposed for the precise control of a moving robot. The target tracking network system is a real test-bed that consists of a group of ultrasonic sensor nodes, a mobile robot and two laptops. In order to pursue excellent tracking performance and modify the robot’s trajectory promptly, Extended Kalman Filtering algorithm as well as a kind of scheduling scheme based on location is applied in the system. The experiment result validates the correctness of the Extended Kalman Filter (EKF) and shows that the target tracking network system is effective for robot feedback control.
Data Fusion Algorithm for Asynchronous Radar Networks under Blanket Jamming
Authors: Zhao Yan Li , Ma Xiao Zun , Gao Xiang Dong , Yun Lei , Fu Shu Qin
Published: February 2012

Owing to the incompleteness and asynchronicity of the observation data, it is hard for the asynchronous netted radar to track its target effectively under intense blanket jamming. This paper presents a kind of data fusion algorithm for the asynchronous sensors based on optimal linearization approach, providing a solution to the problem of target tracking of radar networks under blanket jamming. First, the optimal linearization processing technique of the observation equation is derived. Then, based on this, the state vector of the target is initially estimated in batch mode. Finally, the filtering is processed in sequence. The simulation results show that the data fusion algorithm presented in the paper can track the target in high accuracy.
The Visual Extraction of the Autonomous Lawnmower Navigation Route
Authors: Fu Li Si , Xing Yong You
Published: February 2012

This paper uses the more intuitive visual processing of the camera to extract navigation information instead of using the low-end information collection technology of the photoelectric sensor as the current autonomous lawnmower navigation sensor. Image grey processing, binary algorithm, the image smooth method, the image inflation, the improved Hough transform combining with VC++ are used to get the line in order to distinguish the done and undone lawn successfully and to obtain navigation path and navigation parameters. The improved grayscale algorithm and the Hough transform algorithm have reduced the amount of image data processing, solved the small angle lines problem, and improved the real-time of the robots. Meanwhile prove the impossibility of image sharpening and border detection on extracting lawn boundary. The feasibility of the lawn image processing has been proved by examples.
Permanent Magnet Synchronous Motor Servo System Design and Algorithm Research
Authors: Liu Luo Ren , Luo Jin Ling
Published: February 2012

This article starting from the real engineering, have a deep search on permanent magnet synchronous motor servo system, analyzed the main research focus on permanent magnet synchronous motor control, focused on the mathematical model of permanent magnet synchronous motor, made some meaningful results. Basing on modular design principles, this article have a deep application research on design of permanent magnet synchronous motor DSP conducted, proposed DPS design, has a detailed analysis of permanent magnet synchronous motor servo system software design.
Numerical Simulation of Fatigue Crack Growth of New-Material Track Rollers
Authors: Liu Chang , Guo Xu Hong , Gao Xin Xin
Published: February 2012

Because of the excellent mechanical properties of Austempered Ductile Iron (ADI), track rollers can be made out of this material. The casting may lead to cracks forming inside rollers and there will also be some scratches in the surface when rollers work, which will greatly affect the lifespan of rollers. It is helpful to use crack propagation method based on the Finite Element Method (FEM) to simulate the crack growth. Firstly, define the position and the value of the force imposed on rollers. If the load is compressive, contact pairs should be set between the crack surfaces. After the model is established, Stress Intensity Factors (SIF) KI and KII can be calculated with the node displacement theory by using the commands of FEM software. With the maximum principal stress theory, crack growth direction can be determined. Since the values of KI and KII calculated by the software are positive, we should judge weather the values are positive or negative to get a right propagating angle. The analysis applies linear elastic fracture mechanics and FEM modeling the crack propagation in the elastic state.
Comparison and Evaluation of Lightweight Formats of 3D Models
Authors: Miao Yi Chan , Zhao Gang , Yan Guang Rong
Published: February 2012

The 3D models created by the CAD software have different internal formats, which leads to the poor software compatibility. It takes much longer time while loading 3D models containing much more information by CATIA and so on. During the digital collaboration process of the product design, the quickly transmission of the 3D models is the indispensable part. However, the storage space occupied by 3D models of a large document, resulting in a longer transmission time, thereby will reduce the real-time performance of the collaborative process. A good solution in the industry is to use the lightweight format in product collaborative design. Nowadays there are a variety of lightweight formats. This paper focus on the comparisons of three lightweight formats(3D XML、JT、U3D) often used in the industry. Some experiments are given to evaluate the format effectiveness. In the end, the trend of lightweight formats is also predicted.
Steady Data Acquiring and Robust Neutral Network Training for Boiler Combustion Optimization
Authors: Su Jie , Wang Xu Guang
Published: February 2012

Assuming the measuring parameters obey the Gaussion distribution, this paper proposes a Chi-square distribution based steady data judgment algorithm, which includes two parts, i.e. gross error detection and steady data judgment criterion. In order to overcome the noise’s influence on the result of neutral network training, the paper introduces the RANSAC algorithm into the neutral network training and put forward a RANSAC-BP neutral network training algorithm, which culls noisy data during neutral network training and then retrain the neutral network with noise free data, thus robust to data noises. This algorithm has been validated by a simulation experiment.