bluuebunny/crossref_metadata_2025 huggingface dataset:
Optimization Model of the Cross Intersection Signal Timing Based on the Simulation
Authors: Wang Lu , Wei Li Ying , Zhou Yu
Published: January 2015

In order to solve signal timing optimization problem of the cross intersection with irregular four phases, this paper presents a new method based on the calculation of lane design capacity. There are five steps of the application in this paper: the collection and simple statistics of basic data; the analysis of present situation; the formulation and solution of signal timing optimization model; the evaluation of optimization results which are based on simulation software VISSIM; an actual example was tested to verify the feasibility of the optimization model.
The Research of CIR Based on Communication Technology of GSM-R
Authors: Wen Li Jia , Li Xin
Published: January 2015

In order to realize the wireless communication function of railway locomotives, Cab Integrated Wireless communication equipment (referred to as CIR) as the railway wireless communication system in China's railway locomotives equipment, because has powerful functions, high degree of standardization, and flexible operating characteristics emerged. CRI is based on the GSM-R digital mobile communication technology, GPS global positioning technology, 450MHz and 800MHz analog wireless communications technology such as the development of comprehensive in-vehicle communications equipment. It is the ground of GSM-R equipment and 450MHz, 800MHz and other ground equipment, together form a complete rail integrated wireless communications network.
Research on the Dynamic Characteristics of the Frame System of Material Wagon
Authors: Xie Yu
Published: January 2015

The use of three-dimensional graphics software Solide-edge CAD model to establish the structure of the material wagon, by successfully importing finite element software, building material wagons fine finite element model based on finite element theory, the dynamic characteristics of the model was analyzed, the connatural frequencies and the corresponding modes of the frame was acquired. A simple experimental result was compared to verify the correctness of the finite element model, which provided the correct analysis model for the study of the structure of the frame damping.
Research on Intensive SVG Integrated Power Unit Reliability Analysis
Authors: Jia Qiu Xia , Tong Guang , Zhao Ying , Lv Hong Yu , Meng Qing Yan , Wang Shu Han , Wang Wei
Published: January 2015

As SVG products get more and more popular, new products keep being developed for the demand of actual operation. Intensive SVG is a new kind of SVG developed on the basis of conventional SVG products. The main characteristic of the so-called “intensive SVG” is the draw-out type power module which is featured by small volume, low loss and strong environmental adaptability. The power unit is the core of SVG and its reliability is the foundation on which the entire system functions. Therefore, the reliability evaluation is of vital importance. In this paper, a method of studying its reliability by setting up a reliability module is introduced, which may help with equipment maintenance in future.
A Study on Performance Test of the Self-Cooled System of High-Voltage SVC Valve Group
Authors: Zhang Zhong Lin , Gang Qian Hui , Qiu Peng , Wang Shu Han , Bai Cong Yu
Published: January 2015

The high-voltage SVC realizes the dynamic reactive power compensation through the real-time control over the breakover and cut-off of thyristor. Because the current passing through thyristor is large, the frequent break-make will lead to a lot of thermal loss, so it should be cooled in time. The self-cooled heat pipe cooling system is a traditional high-voltage SVC cooling system, which is expensive and heavy because it adopts relatively expensive copper product and aluminium product.This paper introduces a new heat pipe radiator. Compared to the traditional heat pipe radiators, it is light in weight, small in volume and low in cost. The performance test shows that the thermal resistance of the radiator is 0.064°C/W, that the main performance indexes are superior to those of the similar heat pipe radiators at home and abroad and that its self-cooling ability has achieved a high level. Therefore, it will greatly promote the promotion and application of this technology in China.
Research on Routing Algorithm Based on Ant Colony Optimization for Wireless Sensor Networks
Authors: Chen Dong Ya , Zhang Chang Mao , Li Guang Ye , Tian Tao
Published: January 2015

Routing algorithm based on ant colony optimization for wireless sensor networks has the ant colony algorithm characteristics of self-organization, the positive feedback and the parallelism, which has good performance in constructing the optimal routing. In this paper, the distance for stimulating factor is improved, the communication distance is introduced and the pheromone update methods having the rewards and punishment mechanism are adopted, which can make better use of residual energy for wireless sensor networks nodes, prolong life of network and guarantee the effect of the optimization algorithm.
Analytical Study on the Loss Reduction of Static Var Generator for Power Grid Based on the Soft Switch Technology
Authors: Zhang Yun Shan , Dong Yu Bin , Cao Hui Jie , Jin Min , Wang Shu Han , Wang Ji Hao
Published: January 2015

With SVG technology becoming more and more mature, chain SVG is also installed in some power grid substations to solve local power quality problems, and certain effect has been achieved. Compared with other compensators in the substations, for example, capacitor bank, SVQC, SVC etc, actual loss of SVG is above average level, this limits its practicability.This paper puts forward a method that utilizes soft switch technology to reduce IGBT on/off loss in SVG device, gives main circuit topology of the designed soft switch PWM inverter, and the comparative analysis with on/off loss of hard switch, proves effectiveness of this method.
The Stochastic Resonance of Noise Frequency Modulation Signal Using Motion-Group Fourier Transform
Authors: He Jing Bo , Hu Sheng Liang
Published: January 2015

In this paper stochastic resonance was studied in radar driven by noise frequency modulation signal. According to the intrinsic relations between the stochastic differential and the radar jamming signal processing, the stochastic calculus was used in the radar jamming signal processing in this paper. The noise frequency modulation signal was particularly analyzed. The Fokker-Planck equation of noise frequency modulation was presented and the Motion-Group Fourier Transform was used by converting the partial differential equation into the variable coefficient homogenous linear differential equations. Then the solutions were given.
Study on Power-Train Configuration of Hybrid Electric Vehicle Equipped with Dual Clutch Transmission
Authors: Wang Guang Ping , Wang Qin Nian , Wang Peng Yu , Zheng Yi Hong , Lu Guang Ming
Published: January 2015

In this paper, the advantage of hybrid electric vehicle (HEV) equipped with dual clutch transmission (DCT) was presented. Five HEV simulation models equipped with DCT were built on the basis of AVL CRUISE software. According to different power-train configurations, different control strategies were built by MATLAB/SIMULINK. The advantage and disadvantage of each power-train configurations was analyzed through simulation. The results supplied the foundation for the next step vehicle development.
A Personalized Recommendation Model Based on Contextual Information
Authors: He Yuan Zi
Published: January 2015

Personalized recommendation offers a new way to solve the problem of information overload. In order to effectively build user model and improve the effect of personalized recommendation, this paper proposes a novel model for mining contextual information of non-structure text, and insects the contextual information into user model, which enriches user model. The experiment results shown that the model can greatly improve the recommendation performance when the model is applied to contextual data of the recommender system in hotel.
A Study on Selection of the Main Parameters of SVG
Authors: Wang Ning , Zhang De Chao
Published: January 2015

The inductance and the capacitance on DC side are two important parameter of SVG. In this paper, the effect of inductance and capacitance on DC sides’ voltage control method of SVG is addressed.
Analysis of Commercial Vehicle Thrust Rod Load Simulation
Authors: Feng Guo Yu , Shi Wen Ku , Ke Jun , Guo Lu Lu
Published: January 2015

In order to obtain the accurate thrust rod load, based on the theory of multi body dynamics, establish the complete vehicle virtual prototype model by using ADAMS software, the dynamic simulation of the thrust rod load time history. Combined with MATLAB software to build three-dimensional space pavement model with harmonic superposition method, obtaining the thrust rod load under different conditions, the simulation results show that, the vehicle loaded with uphill turn thrust rod by the load of the largest, and bear in various working upper thrust rod load than the lower load. Consistent with the experimental results, illustrate the modeling method is correct, can quickly and accurately obtain the thrust rod load.
Fast Inpainting Algorithm of Woodblock New Year Pictures Damaged Area Based on Combination of Texture Distribution Analysis and Anisotropic Diffusion Technique
Authors: Yi Wei Wei
Published: January 2015

According to the problem of New Year woodblock pictures damaged area in complicated cases and low efficiency of inpainting, fast inpainting algorithm based on combination of texture distribution analysis and anisotropic diffusion technique is proposed. To digital image of New Year woodblock pictures by using this algorithm to repair has similar effects with the traditional algorithm, but the operation time is far lower than traditional methods. Experiments show that this algorithm not only reduce the numerical computational complexity of the model and inpainting effect is good.
Numerical Simulation of Fluid-Structure Interaction Relations between Skull and Brain Based on ALE and Overlapping Mesh Methods
Authors: Jin Jing Xu , Zhang Jun Yuan , Song Xue Wei , Hu Hao , Sun Xiao Yan
Published: January 2015

To simulate skull-CSF-brain interaction relations, a simple finite element head model is established, based on ALE (Arbitrary Lagrangian-Eulerian) and overlapping mesh methods. The responses of head under impact was simulated with this model. The numerical results are coincidence well with the experimental results conducted by Nahum et al. What’s more, it is found that the skull-brain relative displacement and brain injury may be predicted better with the ALE method.
Numerical Simulation on Pressure Field Characteristics of Underwater Explosion with Double Explosive Sources
Authors: Lu Xi , Wang Shu Shan , Ma Feng , Hao Yun Peng
Published: January 2015

By using the AUTODYN, the study of numerical simulation on pressure field characteristics of underwater explosion detonated by the double explosive sources at the same time shows that a coupled zone with increased pressure appears after the two initial shock waves transmit through each other and at the intersection of the two initial shock waves, the mach wave appears. The transmitted waves diffract around bubbles with a reflected rarefaction wave. The peak pressure in the central area between the two explosive sources is caused by transmitted wave and has dishing isosurface. And the peak pressure outside the two explosive sources is caused by initial shock wave and has spherical isosurface. Coupled peak pressure in the plane of symmetry is two times more than incident peak pressure and with the propagation of shock wave, the ratio of coupled peak pressure and incident peak pressure gradually increases.
The Optimization of Directly Buried Heating Pipe Elbow Based on the ANSYS
Authors: Wang Yao Xiang , Wang Fei , Wang Guo Wei , Lei Yong Gang
Published: January 2015

The two problems restrict the development of directly buried pipeline installation without compensation technology in the heating engineering.Therefore, the intensity of elbow itself is analyzed to optimize the elbow .A new model of elbow is provided .This paper uses ANSYS finite element analysis software to establish a new type of elbow model.We compare and analyze the stress of ordinary elbow which add block and do not add block ; two different types which both have the same wall thickness and new type elbow which have 5 different wall thickness for each elbow.The results show that:(1) the new type elbow can reduce the stress greatly;(2) with the increasing diameter of elbow, the stress of inner elbow decreases gradually. Therefore, this new type of elbow can truly realize non-compensating installation in heating system.
The Agriculture Vision Image Segmentation Algorithm Based on Improved Quantum-Behaved Particle Swarm Optimization
Authors: Deng Ming Hui , Li Zhan Cheng , Zhu Shao Peng
Published: January 2015

Image segmentation and feature extraction are the premise for machine vision system to analyze and identify the image. Threshold image segmentation algorithm according to the method of two dimension threshold has a lot of calculation in calculating the threshold, and the minimum error threshold method can not use the spatial information of image. This paper presents an improved quantum-behaved particle swarm optimization based on the night segmentation and feature extraction technology. This paper introduces the QPSO algorithm based on multi group and multi stage improvement. The QPSO optimizing algorithm gradually approaches the global optimum threshold value to achieve better convergence and stability. An algorithm of vision image segmentation and feature extraction based on improved quantum-behaved particle swarm optimization is designed. Experimental results show that the optimization process of this algorithm has less control parameters and faster convergence speed.
The Limit is Calculated by Using the Main Part of the Function
Authors: Duan Wen Xi
Published: January 2015

If the function is the algebraic sum of finite infinitely small quantities, among which one is lower order infinitely small quantity of the others, the lowest order infinitely small quantity is the main part of the function. However, the limit of the quotient between two infinitely small quantities is equal to the limit of the quotient of their main parts. Similarly, if the function is the algebraic sum of finite infinitely large quantities, among which one is the higher order infinitely large quantity of the others, the highest order infinitely large quantity is called as the main part of the function. Moreover, the limit of the quotient between two infinitely large quantities is equal to the limit of the quotient of their main parts.
Adjusting Methods of the Off-Axis Parabolic Mirror in Terahertz Time Domain System
Authors: Liu Li Ping , Shen Li , Song Mao Jiang , Yang Fei , Han Feng , Hu Peng Fei
Published: January 2015

According to the geometric optics, off-axis parabolic mirrors are used in terahertz time domain system for focusing the terahertz pulse. Theoretically, the focus of the parabolic reflector to eliminate the effects of spherical aberration, but a very high sensitivity to its optical axis misalignment, subtle misalignment will reduce the focal spot quality and therefore the need for precision optical axis adjustment is important. This article discusses terahertz time-domain spectroscopy system adjustment method in four off-axis parabolic mirror, after many experiments have proved feasible. In this work, two optical path adjustment methods were analyzed. The first approach is based on adjustment of spot shape from collimation and focus. In the second method, depend on the principle that the incident light path is different from reflected light path in parabolic cross section. Through testing this two methods have been proved feasible.
Study of DEM Information Security in Geographic Information Service
Authors: Chen Ling Yu , Song Guo Min
Published: January 2015

Geographic Information Service is open service based on the network environment. DEM should be protected because of its significance. This paper gives three methods for DEM information protecting, they are DEM encrypting, DEM information hiding and DEM Information disguising, and researches their theories and techniques. Then, this paper analyses their differences and relation. This paper could provide theory support for DEM information security research in Geographic Information Service.
Abnormal File Access Behavior Detection Based on FPD: An Unsupervised Approach
Authors: Wang Xiao Bin , Wang Yong Jun , Sun Yong Lin
Published: January 2015

Information security is a great challenge for organizations in our modern information world. Existing security facilities like Firewalls, Intrusion Detection Systems and Antivirus are not enough to guarantee the security of information. File is an important carrier of information, which is the intent of quite a number of attackers. In this paper, we extend the FPD-based approach for detecting abnormal file access behaviors. We propose 3 approaches to calculate FPD values in the case of lacking training data, and we apply a k-means based unsupervised approach to distinguish between normal processes and abnormal ones. Experiment demonstrate that our unsupervised approach is still effective compared to the supervised case with training data.
Heterogeneous QoS Provision Schemes over WLANs with the Equivalent Spectral Bandwidth Distribution
Authors: Pan Su , Cai Bing Jie
Published: January 2015

A call admission control (CAC) protocol is proposed for integrated service WLAN networks in this paper. A popular admission protocol is to admit the incoming calls into the WLAN networks whenever it is available so as to take advantage of low cost and large bandwidth of the WLANs. However, the popular protocol can’t guarantee the QoS of the calls. In order to guarantee the QoS, the proposed protocol maps the characteristics (such as bit rate, bit error rate) of different services into the equivalent spectral bandwidth, and dynamically distributes the equivalent bandwidth to different calls. As a result, the QoS of the calls can be guaranteed, and the spectral efficiency has been developed.
The Brief Analysis of Solutions to Automated Network Equipment Security Configuration Baseline Verification
Authors: Ma Zheng , Wang Guang Quan , Xia Jun Jie
Published: January 2015

This paper introduces definition, control object and classification of network equipment security configuration baseline, analyses the difficulties of security work of the security configuration baseline, discusses function demand, the system architecture and the deployment module of the security configuration baseline verification , forms basic shape of the solutions to the security configuration baseline verification and gives suggestions to improve the security configuration baseline indemnification.
Privacy Protection in the Internet of Things Based on Cryptography
Authors: Li Xiu Rong , Zheng Shuang , Liu Ya Li
Published: January 2015

In this paper, we describe some privacy threats in the Internet of Things and some research works on privacy protection. We present a new scheme base on cryptosystem to protect privacy in the Internet of Things. The scheme includes location privacy protection, data privacy homomorphism mechanism and information hiding technology, and secure multi-party computation on data privacy.
The Multi-Factor Durability Evaluation Model of the FRP Applied to the Structure Based on Environmental Differences
Authors: Yang Yong Xin , Zhang Yan Hong , Yue Qing Rui , Li Biao , Chen Peng Fei
Published: January 2015

Based on the existing fiber reinforced polymer (FRP) durability research, considering the difference different regions, a multi-factor durability evaluation model for structural reinforcement FRP has been established. Firstly, combined with the result of rapid aging experiments, a benchmark aging model of a single factor is built. Secondly, classifying the various factors according to different geographical environments, and taking the difference between various environmental factors and test conditions into count, the benchmark aging model is revised. Thirdly, it is to make sure the main environmental factors, determine the effect weight of various factors in different areas and a coupling aging model is established through the coupled superposed. Finally, the carbon fiber reinforced polymer (CFRP) coupling aging model is obtained and compared with actual environmental in A area as an example to validate the model. The result that it can ascertain both trends are consistent and be used to guide durable design.
Reverse Engineering and 3D Printing Technology's Application in Sculpture and the Restoration
Authors: Wang Shi Gang , Meng Fan Song , Qu Bo
Published: January 2015

To elucidate the mechanism that the software Gemagic Studio and 3D printer have an important role in repairing and copying the ancient cultural relics and the damaged sculpture, we take the damaged sculpture, Sissi, as the example, repaired it based on reverse engineering, 3D scanning technology and modern 3D printing technology. In the process of research, we obtain the point data of it, using reverse engineering software Gemagic Studio for the noise removing, compaction, hole filling, surface repair, error ratio and so on. And then import the 3D printer for 3D printing. At the last, the precise entity model proved that we have a wonderful experiment.
Boundary Lubrication Mechanisms of Molybdenum Film by MoDTC and ZDDP Additives
Authors: Li Xing Liang , Yue Wen , Wang Song , Zhao Shi Qian , Hou Xiao Tong , Zhang Tan , Liu Jia Jun
Published: January 2015

Molybdenum (Mo) film is deposited by Ion Beam Assisted Deposition (IBAD) on the 316L steel substrate surface in this experiment. The micro structure and nanohardness of the film are tested by Scanning Electronic Microscope (SEM) and nanoindentation tester. The tribological behaviors of Mo film under ZDDP and MoDTC lubrication are evaluated by SRV test machine. The tribo-film formed on the worn surfaces is investigated by X-ray photoelectron spectroscopy (XPS) to find out the tribological mechanisms between the Mo film and the two additional additives. The result shows that Mo film not only has friction reduction property but also has wear assistant property under ZDDP and MoDTC lubrication. As element Mo has advantage on promoting the deposition of these two lubricating additives.
Large-Scale Experimental Investigation of the Fire Characteristics Parameters of Methanol in Coal Chemical Industry
Authors: Wang Lu , Bi Yi Xing , Wu Wei , Xu Da Jun
Published: January 2015

A steel channel with the size of 30×2×1.2 m was made to simulate the full surface fire of 50000 m3methanol tank in coal-to-olefins industry. Some fire characteristic parameters of methanol were investigated, including flame spread rate, flame height, temperature distribution and radiation heat flux distribution. It is found that the flame spread rate of methanol is 1.98 m/s and the flame height could reach to 3.2 m. The temperature of methanol flame is first up and then down with the increase of height, while the highest temperature is 768oC. It is also found that the radiation heat flux of methanol flame is in the changes between 4.4 kW/m2and 12.2 kW/m2. The feature of methanol fire is different from the normal oil fire, which is worth for us to pay more attention.
Microstructural Evolution and Mechanical Properties of Pure Magnesium during Multi-Axial Compression
Authors: Yang Xiao Hui , Ni Song , Song Min
Published: January 2015

The effects of multi-axial compression (MAC) on the microstructures and mechanical properties of pure magnesium were investigated. It has been shown that grain refinement and grain growth occurred simultaneously during the MAC process. After 5 MAC passes, the grain size is mainly distributed in the range of 5~25 μm. The hardness of the specimens increases with increasing the strain (MAC pass), with the increment at lower strain being more obvious than that at higher strain. Compression tests showed that the samples show significant difference in mechanical properties along different directions due to the texture development. With increasing the MAC pass, the texture has been weakened due to multi-axial deformation.
Mix Design and Performance Research on Asphalt Mixture of SUP-20 with Lucobit
Authors: Zhang Ye Mao , Wang Kun
Published: January 2015

To research the grading applicability of Lucobit modifier and make it adapt to China's basic national conditions very well, the gradations of SUP-20 was selected to research mix design and pavement performance in the text. First, the mix design of SUP-20 without Lucobit is researched. Then the performance of SUP-20 is verified including the high temperature, low temperature and water stability performance of common asphalt mixture. At last the performance comparison between SUP-20 asphalt mixture with 7% Lucobit and without is carried out. Results show that the performance of SUP-20 asphalt mixture with 7% Lucobit and without can all meet the requirement. Compared with the performance of SUP-20 asphalt mixture without Lucobit, the low temperature and water stability performance with Lucobit have a little improvement and the high temperature performance improves a lot. So Lucobit modifier can greatly improve the high temperature performance of SUP-20 asphalt mixture.
Numerical Study of Residual Stresses Induced by High Speed Milling Hardened SKD11 Steel
Authors: Liu Y.C. , Tang De Weng , Zou S.L. , He Z.F. , Xie Yu Peng
Published: January 2015

A thermo-mechanical numerical model for high speed milling hardened SKD11steel is developed to study the influences of mechanical load and thermal load on residual stresses for each feed. The residual stresses are predicted, which are induced by high speed milling hardened SKD11 steel. Based on a simplified two-dimension assumption, the continuous feed numerical model of high speed milling hardened SKD11 steel is developed. A modified Johnson–Cook (J-C) model considering the effect of phase transformation on flow stress is employed to model residual stresses. The results show that residual stresses dominate over the mechanical load and its impact becomes more and more significant for the posterior cut. The tensile surface residual stresses of posterior cut becomes larger than the previous cut but the work hardening thickness of posterior cut becomes thinner in the condition of this study.
Synthesis and Tribological Behaviors of SiO2/SnO2 Composite Nanoparticles in Rapeseed Oil
Authors: Fang Jian Hua , Chen Bo Shui , Wang Xue Chun , Wang Jiu , Wu Jiang
Published: January 2015

SiO2/SnO2-complex nanoparticles were prepared making use of a chemical method. The tribological properties of the resulting complex nanoparticles as an additive in rapeseed oil were evaluated using four–ball friction testers. The topographies and the chemical species of the worn surfaces of steel ball were analyzed by a scanning electron microscope (SEM) and an X-ray photoelectron spectroscope (XPS), respectively. It was found that the complex nanoparticles as the additive contributed to greatly improve the anti-wear ability and load-carrying capacity of the rapeseed base oil. The improved anti-wear ability and load-carrying capacity of the base stock in the presence of the complex nanoparticles as the additive were attribute to the adsorption and deposition of the nanoparticles on the sliding surface and subsequent formation of a boundary lubricating layer with a small shearing strength.
The Production, Qualitative and Adsorbent Study of β-Cyclodextrin Molecular Engram
Authors: Liu Zhi Jang , Ma Maeng Di , Dai Da Yong , Shao Zhong Cai
Published: January 2015

In the paper, the molecular engram polymer is produced by dithizone which is functional monomer,β-cyclodextrin which is pore-forming material and chloroepoxy propane which is crosslinking agent. Atomic absorption method is used to study its adsorption for lead. Thermodynamic model of adsorption and dynamic reaction order are discussed. The results show that adsorption is endoergic process and accords with Freundlich isothermal adsorption equation. Adsorption system conforms with pseudo-second order dynamic model, the static saturation adsorption amount is 45.55mg/g.
Analysis of Optimization about the Wall Temperature of the Biomass Fuel Hot Stove
Authors: Lin Xi Yu , Fu Guo Min , Lv Wei , Cheng Chao
Published: January 2015

This paper introduces the structure and working principle of biomass fuel hot stove, and analyses the existing problems in the combustion process. Simultaneously, the paper proposes the optimization about the wall high temperature of the hot stove, which is the main issue in the hot stove.

Biomass resources in China is very abundant.only the amount of resources of agricultural wastes (such as straw) each year is equivalent to 3.08 tons of standard coal. The biomass briquette is compressed with loose, amorphous materials, such as straw, rice husk, sawdust, wood chips, into a shaped, denser solid fuel with the method of mechanical pressure. It has the advantages of small size, high density, easy storage and transportation, combustion stability, long cycle, high combustion efficiency, low contaminant levels in ash and flue gas. It provides an effective way to solve the energy shortage in rural areas and straw burning problem fundamentally[1].
Study on the Relationship between Meteorological Conditions and Brine Evaporation Rate
Authors: Li Ling , Zhou Ying , Wang Xue Kui , Gao Tian Cheng , Tang Na
Published: January 2015

The influence of the two main climate parameters including irradiation intensity and wind speed on the law of natural evaporation rate has been studied through the indoor simulating system of environmental conditions. This work may provide basis data for predicting the brine evaporation rate with seasonal climatic change and rational design of brine evaporation scheme.
The Study about Breakdown between the Electrodes Gap Law in WEDM
Authors: Wang De
Published: January 2015

For the question of difficult to control discharge process between the electrodes in WEDM, Systematic analysis of the relationship breakdown and the distance between poles、the relationship of the breakdown voltage and pulse duration、the relationship breakdown and impurity、the relationship breakdown and the temperature、Summed up the WEDM in the general laws of the electrode gap breakdown、So as to better control of WEDM process in the very room provides a theoretical basis for discharge.
The PCB Surface Defect Detection System Based on GPU Acceleration
Authors: Liu Yu , Li Si Zhe
Published: January 2015

Defective products are unavoidable in printed circuit board production process, so rapid detection and identificationmethods are badly in need of. PCB surface defect detection including a series of processing such as surface imagecapture, mixed noise filtering,images registering and so on, so it takes a lot of CPU time. To improve detection speed, based on GPU parallel computing platform, we designed a reasonable parallel processing system for PCB defect detectionto meet the need of real-time requirements of a production line. Experimental results show that parallel image processing algorithms based on GPU can achieve good results compared to the CPU-based serial algorithm (with speed up ratio up to8.34 in this paper),providing a new approachfor rapid detection of PCB surface defect.
The Comparison of Segmentation Results for High-Resolution Remote Sensing Image between eCognition and EDISON
Authors: Liu Xin , Xu Jing Wen , Zhao Jun Fang , Yong Li , Xin Zhan
Published: January 2015

For the point of high-resolution remote sensing image segmentation, this paper compared the segmentation effect between eCognition and EDISON through adjusting appropriate parameters. The experiment show that eCognition plays better than that of EDISON in segmenting more complex ground objects, while EDISON plays better in segmentation more uniform ground objects.
The Method Study of Laser Alignment Applied to Complete Zero-Line Detection of Artillery
Authors: Tang Wei , Wang Li Qiu , Yu Hong Zhou , Liu Xiang Ping
Published: January 2015

Aiming at the relatively complicated methods of zero-line detection of artillery, and the limiting of high requirements for target range measurement or the field of calibrating artillery of combat troops, this paper presents the method that laser alignment is applied to complete zero-line detection of artillery. This paper introduces the basic principles and methods of the method, and conduct theoretical analysis, modeling and calculation and determination of related parameters based on the optical principles of laser. This method can be used to complete zero-line detection of artillery in small venue, and provide convenient conditions for the detection for aiming line of artillery, the method is especially suitable for limiting of the field of calibrating artillery of combat troops, and calibrating artillery before shooting in a relatively harsh climatic conditions.
The Research of Embedded Remote Monitoring System Based on B/S Framework
Authors: Dang Guo Qing , Cheng Xiao Yan
Published: January 2015

The embedded remote monitoring system is based on embedded technology, video coding technology and network transmission technology as the core of the new video surveillance system, it in real-time monitoring system, network, miniaturization, etc than traditional remote monitoring system has outstanding advantages. The embedded server is responsible for the data from field devices and video images, and real-time and reliable transmission to the remote client browser. User through a PC browser login system, can get equipment real-time data and video image, also can control the equipment, so as to realize remote monitoring. This paper designed and implemented a embedded remote monitoring system based on B/S structure, is of important engineering value.
Analysis on Gear Cracking in Bucket Wheel Stacker Reclaimer
Authors: Bian Xin Xiao
Published: January 2015

This article mainly analyzes the bucket wheel stacker reclaimer slewing mechanism gear cracking. We put the flange as the research object. Through analysis of matrix composition and cracking gear macro fracture morphology, we can preliminarily determine the cracking mechanism and failure cause of the flange. Then, through the carrying capacity of gears calculation by the analytic method and the finite element method, we further identify the failure causes of the flange and put forward the reasonable and feasible solutions.
Design and Research of Intelligent Warehouse Monitoring System of Multimedia Sensor Network
Authors: Zhang Yong
Published: January 2015

Multimedia sensor network is regarded as a brand-new information acquisition and processing technology. It pays more attention to acquisition and processing of audio, video, images and other media with large data size and large information content compared with traditional sensor network. The network has broad application prospects. In the paper, intelligent warehouse monitoring system based on multimedia sensor network integrating multi-sensor sets, distributed processing and event-triggered monitoring is designed and developed. The system is based on construction of wireless sensor network and video monitoring network. Wireless sensor network is established by scalar sensor nodes by using IEEE 802.15.4/ZigBee protocol, and it is responsible for collecting and processing scalar data, and transmitting results to sink node. Video monitoring network is composed of multimedia sensor nodes by using Ethernet. Monitoring data, compressed video/audio streaming and other multimedia data of sink node on wireless sensor network are sent to the monitoring center and users. The system can better provide warehouse environment parameter monitoring, event-triggered or continuous remote monitoring functions.
A Study of Beer Fermentation Control System Based on the Technology of Computer Control
Authors: Jiang Jun Hai , Zhuang Qian Zhang
Published: January 2015

By analyzing the structure characteristics of fermented beer and has the function of system analysis, introduced in the fermentation process of beer, the use of computer technology, the real-time processing of beer fermentation temperature, pressure, the collection of data signal level etc.. The computer system to realize the automatic control and management on the beer fermentation process of beer fermentation, production management and cost will be greatly improved.
Study on Personnel Positioning System of Ship Based on Zigbee Technology
Authors: Mao Jiang Kun , Zhan Fan
Published: January 2015

In order to pinpoint the location of the crew, master the number, location and distribution of personnel and activity track of time period, designed personnel positioning system of the ship based on zigbee technical by the gateway node, reference node, locate nodes, and designed personnel positioning system software in the IAR development environment. RSSI location algorithm has been improved, and the improved positioning algorithm using Matlab simulation to test, the test results show that the improved algorithm has higher positioning accuracy.
Mode Dependent Coefficients Scanning with Multi-Mode Analysis
Authors: Liu Dang Jing , Ye Long , Wang Jing Ling , Zhang Qin
Published: January 2015

In block transform based coding, coefficients scanning plays an important role in improving compression performance. A good scanning method has great potential to remove statistical redundancy, as it can apply an energy compaction coefficients vector. In this paper, a mode-dependent (MD) coefficients scanning method is introduced, with the idea of reducing the overall bit rate by adopting side information to coding mode indexes. In the experiment, we design 128 MD scanning tables according to the DCT coefficients energy distribution, and explore the relationship between the number of scanning table used and the bit saving in image coding. The results provide reference to choose scanning modes by considering the trade-off of the increasing of side information and the decrease of data redundancy.
Synthesis of BCN Nanoparticles Sandwiched between Carbon Nanosheets and Performance in Electrochemical Capacitors
Authors: Yang Ren Li , Zhou Jun Shuang , Hou Li , Zhao Yu Feng , Gao Fa Ming
Published: January 2015

BCN nanoparticles sandwiched between carbon nanosheets were synthesized with the P123 and borate ammonium under nitrogen atmosphere. The samples were characterized by SEM, TEM, and EELS. The SEM and TEM images show BCN nanoparticles are attached on the carbon nanosheets. Cyclic voltammetry (CV) and galvanostatic charge-discharge measurements are used to evaluate electrochemical properties of the composites. The samples show the specific capacitance of 102 F/g at current density of 200mA/g and good durability.
Cluster Mixed Synchronization of Complex Networks with Disturbance
Authors: Zeng Li Jie
Published: January 2015

In this paper, we investigate the cluster mixed synchronization scheme in time-varying delays coupled complex dynamical networks with disturbance. Basing on the community structure of the networks, some sufficient criteria are derived to ensure cluster mixed synchronization of the network model. Particularly, unknown bounded disturbances can be conquered by the proposed control. The numerical simulations are performed to verify the effectiveness of the theoretical results
Simulation and Analysis of the Temperature-Compensated FBAR
Authors: Zhou Bin , Gao Yang , He Yi , He Wan Jing
Published: January 2015

The property of temperature-frequency drift has an effect on the passband ripples, center frequency and insertion loss of FBAR filters, reducing the reliability of its electrical application. A temperature-frequency drift simulation of a typical Mo/AlN/Mo FBAR is achieved by means of finite element analysis software ANSYS, the simulated temperature coefficient of frequency is about-35ppm/°C within the temperature range of-50°C~150°C. By adding a compensated layer with positive temperature coefficient in the FBAR structure, the effects of the compensated layer thickness on temperature-frequency drift, resonant frequency and electromechanical coupling are analyzed. The simulated temperature coefficient of frequency of designed temperature compensated FBAR, which composed of Mo/AlN/SiO2/Mo, is about 0.8ppm/°C, the property of temperature-frequency drift is effectively improved.
Using Dual-Channel D/A Converters Design Successive Approximation A/D Converter
Authors: Wang Jia Rong , Xia Xiao Dong , Zhang Zong Da , Yang Han
Published: January 2015

The successive approximation analog-to-digital converter (ADC) has been widely used in electronic devices due to the corresponding characteristics which are low cost, low power consumption, high accuracy and so on. This paper expounds a design of successive approximation A / D converter to show how to use TCL5615 which is a dual-channel serial 10-bit D/A converter (DAC) to make the conversion accuracy to reach 14-bit.
The Compatibility of Service Protocol in Pervasive Computing Environments
Authors: Yu Cheng Yuan , Yin Yi Ying
Published: January 2015

In pervasive computing environments, a single service is often unable to meet the complex needs of users. A composite service is a combination of services to provide value-added services that a single service cannot achieve. Thus, it is important to ensure that services protocol are compatible. This paper provides a formal description of service protocol, a new definition of services protocol compatibility and a algorithm for automatic generation adapter for incompatible services protocol.
Optimized Prefetching Scheme to Support VCR-Like Operations in P2P VoD Applications with Guided Seeks
Authors: Jiang Yong , Zhang Shu Wu , Liu Jie
Published: January 2015

In Peer-to-Peer (P2P) Video-on-Demand (VoD) streaming systems, supporting free VCR operations is challenging. Prefetching is a good way to improve user experience of VCR interactivity. But most existing P2P VoD prefetching schemes are proposed aimed at those popular videos with large amount of log data, without considering the situation that the videos are unpopular or the popular videos are in their initial phase of release. In this situation, these schemes cannot support user VCR interactivity very well. To address this issue, we propose a new optimized prefetching scheme, called Hybrid Anchor Scheme (HAS), in which fixed anchors and dynamic anchors are merged together. The dynamic anchors are generated based on association rule and segments popularity. Through combining the way of sequential prefetching according to weight of segments and the way of several rounds prefetching, we implement HAS effectively. Extensive simulations validate the proposed prefetching scheme provide shorter seeking latency compared to other prefetching schemes.
Design and Implementation of Visual Interface Modeling Method Based on .NET
Authors: Zhang Zhong Qiu , Zhang Zhong Qin , Yu Hui
Published: January 2015

In this paper, based on the analysis of ordinary visual modeling method, with the purpose of instantly and conveniently providing a more effective modeling method, a visual modeling method based on .NET is proposed. The visual modeling method based on .NET is easier to implement, because of the. NET design environment support. Besides, its interactivity and strong operability make software develop more conveniently.
Research on the Parallel Frequent Data Mining Strategy under the Cloud Computing Environment
Authors: Sheng Xiao Chun , Xue Xiao Feng , Cheng Yan Ping
Published: January 2015

Cloud computing is computing tasks distribution resources of a large number of computers in the subnet, to provide users with cheap and efficient computing power, storage capacity and service capabilities. Data mining is to find useful information in large data repository. Frequent flow of large amounts of data quickly and accurately find important basis for forecasting and decision, therefore, under the cloud computing environment parallelization frequent item data mining strategy to provide efficient solutions to store and analyze vast amounts of data has important theoretical significanceand application value.
Tensors Method Based Method of RF Fingerprints Identification
Authors: Tang Zhi Ling , Li Si Min
Published: January 2015

Because of RF power amplifier’s nonlinearity and the discrete distribution of electronic components value, it is possible to form individual RF fingerprints. How to identify individual RF fingerprints is the key problem because received RF signals are weak to be affected by channel noises. In order to identify steady RF signal fingerprints, this paper proposed a tensors-based method for obtaining identification patterns from high order cummulants. Firstly, high order cummulants tensors of received RF signal were formed as distinguished patterns of RF Fingerprints. Secondly, these cummulants tensors were passed to classifiers as training data and testing data. The RF Fingerprint classifiers based on SVM and RBF networks are compared with their performance. Finally, the identification results of two classifiers were obtained. The results showed that the method is effective for RF Fingerprints Identification.
Experimental Method of Slip and Surface Temperatures for a Silicone-Oil Fan Clutch
Authors: Zeng Xiang Kun , Song Li Ming
Published: January 2015

A viscous fan clutch with double grooves is taken as a studying example for measuring its slip and surface temperatures. The grooves between driving and driven plate of the viscous clutch are filled with silicone-oil in this study. Experimental methods and test rig to measure the slip and surface temperatures for a viscous clutch are discussed. The relations of the clutch slip and clutch surface temperatures with the change of the input speed are measured.
FE Simulation of Torque and Drag inside Borehole of Oil and Gas Wells (Part II)
Authors: Bagadi Yousif E.A. , Gao De Li , Fadol Abdelwahab M.
Published: January 2015

The wellbore friction, torque and drag, between drill string and the wellbore wall is the most important issue which limits the drilling industry to go beyond a certain measured depth.The calculation and analysis of torque and drag were considered to be very important in drilling and well design. A variety of models (soft, stiffness, mixed and finite element) have been used to determine the torque and drag. A FEA (Finite Element Analysis) model of the drill string to simulate it’s working behavior, involving contacts between the drillstring and borehole wall was developed, this FE Model was to be compared with computational model of torque and drag, and to be verified with experimental results.The drillstring displacements calculated by the FEA model matches those from commercial software in petroleum industry (Landmark). The model developed and discussed in this paper can be used for predicting torque and drag inside wellbores of oil and gas wells, and it will also benefit in preplanning simulation of oil and gas well drilling operations.
Typical Hull Structure’s Longitudinal Strength Calculating Methods
Authors: Peng Fei , Zhang Yue Lin , Mu Jin Lei
Published: January 2015

To get the typical ship structures’ longitudinal bend stress in hogging condition, standard method and finite element method, two kinds of longitudinal strength calculating methods are studied and compared in this paper, the section elements of typical ship structures are calculated, the cabin’s finite model are established by ABAQUS, the stress distribution moiré topography are obtained, and the two methods are compared, get the following conclusion: for the section which has a regular shape, such as bottom plate, strength deck, the calculation results from the two methods are consistent; for the section which has a complex shape, such as bilge board, the results of finite method is more accurate than standard method; in standard method, for the section which has a large vertical height, such as side plate, dividing it into some plate units can enhance the calculating accuracy.