bluuebunny/crossref_metadata_2025 huggingface dataset:
Cooperative Partial Message Relaying Based on Distributed Polar Codes for the Two-Relay Network
Authors: Duo Bin , Wang Zhen Yong , Gu Xue Mai
Published: March 2013

A cooperative partial message relaying (CPMR) scheme based on distributed polar codes (DPC) is proposed to achieve the maximal decode-and-forward (DF) rate of the stochastically degraded symmetric binary-input two-relay network with orthogonal receiver components (TRN-ORCs). In the proposed scheme, the code design problem of the degraded TRN-ORCs is transformed into a problem of polar codes with CPMR protocol. According to the nested structure of polar codes, the messages transmitted by the source and the first relay are recovered successfully at the two relays, respectively, and then the two relays yield correct partial messages for transmission to solve the uncertainty of the source message at the destination. With the help of the CPMR protocol, the destination should be able to reconstruct the source message correctly. In addition to the practical consideration of the construction of the CPMR protocol based on DPC, we also derived that the block error probability of the proposed scheme can be upper bounded by O(2-Nβ) for any constant β (0 < β < ½), and sufficiently large block length N.
An Adaptive Routing and Resource Assignment Algorithm with Load Balancing in WDM-TDM Networks
Authors: Quan Bi Sheng , Li Hui , Le Zi Chun
Published: March 2013

All-optical WDM networks are the most promising candidate for the next generation wideband backbone networks. To improve the utilization of wavelength, TDM technology is introduced into it. The routing, wavelength and time-slots assignment (RWTA) problem was studied in such time-space switched networks. A new adaptive algorithm was proposed which adopt adaptive network link weights and distribute slots of the session request on multiple different wavelengths adaptively with the remainder resource of the network. The effectiveness of the proposed algorithm is demonstrated by simulations and results show the better performance.
Advanced Technologies for 100G Optical Networking
Authors: Shi Hong Wei , Zhang Peng Tu
Published: March 2013

We review key advanced access technologies for 100G optical networking. These include novel candidate optical access for 100G optical networking, Nodal network and Architecture Choice, and device technologies.
Delay-Locked Loop for Pseudorange Measurement over Frequency-Selective Fading Channels
Authors: Wu Ya Ting , Sun Yan Zan , Luo Xi
Published: March 2013

A delay-locked loop is proposed for accurate code tracking over frequency-selective fading channels in this paper. Taking advantage of the shift-and-add property of maximum length pseudorandom spread-spectrum sequences, the differential multiplier is employed to separate each multipath component and reduce the effects of other multipath signals. The contribution of all the multipath signals is combined to enhance the error characteristic. Simulation results verify the performance improvement of the proposed loop.
Adaptive Echo Cancellation Combined with Delay Estimation
Authors: Zhang Zhi Ping , Wu Xi Hong
Published: March 2013

This paper proposed an echo canceller to reduce the computational complexity of the long delay echo cancellation. Two adaptive filters were used for constructing this echo canceller. One was designed as a delay estimator, which used down-sampled sub-band signals to estimate the echo delay time. The other was designed as a short-tap filter to subtract the echo from the recorded signal with delay compensation. Experimental results showed that the output signal-to-noise ratio from the proposed canceller with low complexity is similar to that from the conventional canceller based on a long-tap filter.
A Fast Intra Coding Unit Size Decision Based on Statistical Learning for HEVC
Authors: Zhou Cheng Tao , Tian Xiang , Chen Yao Wu
Published: March 2013

High Efficiency Video Coding (HEVC) is an ongoing standard, and it employs the quad-tree block partitioning structure which includes coding unit, prediction unit, and transform unit. This content-adaptive coding tree structure can improve HEVC coding efficiency significantly, but it also consumes large computational complexity. This paper proposed a fast intra coding unit size decision algorithm to reduce the heavy complexity of HEVC encoding. First, the proposed algorithm reduced unit sizes search by using the classifier, which is based on the statistical learning. Second, an early largest unit size decision was designed to skip the checking of unnecessary unit sizes. As compared to the full search algorithm in HEVC reference software, experimental results show that the proposed algorithm achieves 50.4% computation saving on average with 1.83% bit rate increase and 0.070dB peak signal-to-noise ratio loss.
Research on Application of Internet of Things in Nursing Home
Authors: Huang Jian Ming
Published: March 2013

With the coming of aging society, a lot of old people choose to spend their old age in nursing home. Some old men are dementia, disability or long-term illness, this is a new challenge to nursing home management. This paper presents an intelligent management system solution of nursing home based on Internet of things; nursing staff can monitor the old man's whereabouts in 24 hours, to protect the safety of the old man. For the sick old man, use a variety of sensors for real-time vital signs data acquisition to realize medical monitoring, and transfer data to central hospital for diagnosis and monitoring by doctors.
Study on Informatization Management of Personnel in Colleges
Authors: Liu Jian Feng
Published: March 2013

Now, personnel service in colleges have achieved the preliminary informatization, and there still exists problems such as informatization level of personnel management is below, information communication and feedback has worse instantaneity, et al. The leaders of the colleges have not pay attention to the management system of personnel information before, so problems during the management strengthen and relevant suggestion and opinion will point out in this paper.
An Improvement Password-Based Authentication Protocol Using Smart Card
Authors: Liu Hui
Published: March 2013

To access resources from a remote system, the user authentication is a very important security mechanism. Among remote authentication protocol, password-based authenticated key exchange protocol is most popular since the two communication entities only shared a human-memorable password can establish a session key which is used to protected their later communication over an insecure networks. Recently, Xu Zhu proposed improved password-based protocol using smart card based on previous research. He claims that his protocol is secure against various attacks. However, Song points out that the Xu Zhu’s protocol suffers from attacks. In addition, Song gives an improved version of Xu Zhu. In this paper, we first found Song’s protocol also is vulnerable to off-line dictionary attack. Later, we extend Song’s protocol so that the extended protocol can resist to off-line dictionary attack even if an adversary captures the smart card.
Research on RFID Technology in Electronic Waste Recycling
Authors: Li Fu Yu , Wang Qi , Li Zhe Kun , Peng Yong Xin
Published: March 2013

The number of E-wastes in China is more and more amazing in recent years, but it is lack of effective information system support and advanced means of information collection in the recovery process. In the paper, according to the circular economy "3r" principle and the characteristics of RFID (radio frequency identification) technology the author constructed a based on RFID E-waste recycling model. In the whole recycling process it can maintain the integrity of the information, real-time, so as to strengthen the enterprise for product whole life process control and it is helpful to the poisonous and harmful material of the recovery, reduce impact on environment.
Design and Implementation of Massive Data Retrieving Based on Cloud Computing Platform
Authors: Xiao Wei , Ji Chun Lei , Li Jian Dun
Published: March 2013

Considering the low efficiency of massive data retrieving in traditional parallel processing, by taking advantage of the great availability of cloud computing paradigm, we propose a hybrid solution based on Map-Reduce model and distributed computing framework--Spark. Moreover, we design and implement this solution in our lab. The results show that the solution can effectively improve the performance of massive data retrieving.
Dynamic Load Balancing Algorithm Based on Task Classification for Data Retrieval
Authors: Chen Lin , Fang Zhi Yi , Wang Hong Bin , Yang Rui
Published: March 2013

Load balancing problems play a special role in the operation of parallel and distribution systems. The core technology of load balancing is the task scheduling. In order to achieve equally distribute the load on processors and maximize their utilities while minimizing the total task execution time, this article analyses a large number of data retrieval requests content. It shows different tasks have different resource occupation rate on the server node and the current server load is also different. The demand of different task types on CPU and I/O resources are not same. So, this paper presents a dynamic load balancing algorithm which is based on task classification, and applies it to the cluster system data retrieval.
Research of Object-Oriented 3D Video Coding Segmentation
Authors: Zhang Jian , Huang Zhi Ye , Peng Jin Xiang
Published: March 2013

This paper presents an algorithm about the extraction of left channel video object which based on high-order statistical change detection and the segmentation of right channel video object based on parallax matching. This algorithm combines the advantages of disparity map segmentation and multiple frame difference motion segmentation. First of all, through the segmentation of the parallax matching video objects in the right channel, we can get primary partition templates in different layers of parallax targets; Secondary with high-order statistical change detection, we can extract video objects in the left channel from templates. Finally we obtain the accurate moving target. Based on 3D multi-view video segmentation, we use H.264-based method to encode the main image flow and then get object-based 3D video coding
The Application Level Multicast Technique Algorithms Oriented to P2P Video
Authors: Huang Zhi Ye , Peng Jin Xiang , Zhang Jian
Published: March 2013

Firstly challenges in P2P media streaming applications were pointed out, then some recent research results such as application-level multicast tree, heterogeneity of network and incentive mechanism and so on were introduced. This paper has proposed a new model of application level multicast named DHCM (density-based hierarchical clustering multicast)which has improved IHC arithmetic．DHCM divides the hosts into many hierarchies according to their density，and constructs a density tree to realize the shortest routing．The tree delivers the content of video server to each host in density tree and uses a P2P scheme in data transmission．By this way the application-level multicast has been realized．This density tree has the homogeneity and monotonic properties．The experiment result has proved that DHCM can transmit the video stream efficiently and robustly.
Analysis of Web Pages Based the Changed Information and its’ Application in the Search Engine for one Web Site
Authors: Liu Hong Shen , Wang Peng Fei
Published: March 2013

The structures and contents of researching search engines are presented and the core technology is the analysis technology of web pages. The characteristic of analyzing web pages in one website is studied, relations between the web pages web crawler gained at two times are able to be obtained and the changed information among them are found easily. A new method of analyzing web pages in one website is introduced and the method analyzes web pages with the changed information of web pages. The result of applying the method shows that the new method is effective in the analysis of web pages.
Study on Lifecycle and Criteria of Software Engineering
Authors: Deng Huai Yong
Published: March 2013

Traditional software engineering is complex and scalable. The research goal of this paper is to contribute to software engineering discipline via engineering perspective, engineering fundamental principles are studied through the identification of software engineering fundamental principles and the description of operational guidelines. This research also researches the software development lifecycle and the criteria and specifications of software engineering from an engineering perspective.
Autonomic Network Control and Management System for Engineering Training Room
Authors: Hu Yu
Published: March 2013

Core networks should continue delivering best effort service and at the same time they have to be able to meet different transport service requirements initiated by multiplicity of heterogeneous users. Management is a fundamental aspect of the promise of next generation networks and services. In this paper, AutoNet as an autonomic management and control system networks is put forward. AutoNet is architecture to automate data transport delivery in backbone networks. We also take the project of autonomic network control and management system for engineering training room as the instance to research the technology for university experiment teaching.
Sedona Frame Application in Embedded Linux
Authors: Li Li Meng
Published: March 2013

Embedded systems are used in many fields, but they are different from each other due to the varied practical conditions. Even for embedded devices installed under the similar situations, different control logic programs still exist. Covering the difference coursed by specific applications would highly improve the adaptability of the embedded devices. This paperwork presents a proposal that using Sedona Frame to improve the flexibility of embedded devices. In this paperwork, coupling plan and procedure are focused on greatly between Sedona Frame and device drivers and the feasibility of the coupling plan is proved using an instance of digital input devices. The advantage of graphic programming of Sedona Frame is discussed as well.
Touch Screen Technology and its Driver Design in uCLinux
Authors: Wu Shu
Published: March 2013

Touch screen input system about hardware connection and driver design in uCLinux were presented in this work. With the respect of hardware, it introduced working mechanism of four-wire resistive touch screen and method of calculating coordinate. Then it presented the hardware connection of touch screen input system including touch screen, touch screen control chip and Microcontroller Unit. With respect of software, it analyzed the characteristic of driver design in uCLinux. Then it divided touch screen working process into six states which were ‘start’, ‘idle’, ‘wait’, ‘read’, ‘error’, ‘end’ and defined the state transition. On this basis, Touch screen driver design was introduced, which mainly included initialization function, clean function, device-opening function, device-releasing function, coordinates-reading function and parameters-setting function. It also gave the arithmetic converting touch screen coordinate to application coordinate.
Reacher in Users Recommended of Social Data
Authors: Yin Hu , Lv Yun Fei , Wang Wei Wei
Published: March 2013

We discuss some key techniques associated with integrating user social data recommendation into entity search engine, which can provide entity search engine more accurate information and make up for automatically fetching information on Web. The goal of social data recommendation is to make search engine become a content provider, and solve some challenges that traditional architecture of search engine has faced with, such as limited resources, accurate search, etc. To this end, we describe the storage format of the user social recommended data and submission methods for them. For the purpose of fusing this structural information into entity search engine, we present formal definitions related to Web entity fusion, and give several important fusion operators, and discuss their properties. Finally, we propose a Web entity fusion algorithm, which exploits some techniques related to natural language processing such as sentence similarity computation and sentence fusion. Our experimental results show that the proposed algorithms are effective.
The Application of Virtual Reality Technology in Transmission Live Working Training
Authors: Chi Wu , Zhang Qiu Shi , Fan Liu , He Han Feng , Su Ming Hong , Yin Shan Feng
Published: March 2013

This paper introduces the basic concepts and characteristics of virtual reality technology briefly and analyzes the defects of the artificial guiding teaching of the current live working from the angle of skills and safety, combing the power grid’s physical characteristics and virtual reality techniques. By summing up the transmission live working running operating procedures, the methods and means of using virtual reality technology in the teaching and training of the transmission network for live working are proposed. Summary transmission live working training status and analyze the application prospect of the virtual reality technology in the power transmission network live working on the basis of summarizing the power transmission network live working training status. The transmission live working simulation training method brings a new look to the power companies and also does great benefit for the enhancement of the operators' skill level and the improvement of their security awareness of operating.
Beneficiation Process Optimization Study on a Low-Grade Hematite Ore
Authors: Wang Wei Zhi , Jia Qing Mei , Yang Chun Guang
Published: March 2013

A hematite has low grade, fine disseminated size andcomplex disseminated relations, which are refractory iron ore. Using SLon pulsating high gradient magnetic separator, induction intensity 8500Oe, pulsating 20mm stroke, stroke of 120 beats / min), a crude iron ore concentrates a grade of 35.93.%, the recovery rate of 82.39% is obtained through high intensity magnetic separation.( The final iron concentrate with TFe grade of 64.83%,yield of 14.55% and iron recovery of 35.74% from the raw ores with TFe grade of 26.29％ was obtained, with the first stage grinding size being 50% -0.074mm and the second stage,95% -0.074mm.
A Research on Key Management in Wireless Sensor Networks
Authors: Zheng Yan Hua
Published: March 2013

With the constant development of wireless sensor networks technology, the expanding application scope and the increasing processing power of sensor nodes, there are more and more data collected and processed through the sensor, thus ensuring the security of information transmission between nodes is in urgent needs. The secure application of wireless sensor networks has become a hot technology. This paper mainly expounds the key management schemes of wireless sensor networks, and analyzes the mainstream key management schemes.
Large Volume Urban Train Security Detection Sensor Network Structure
Authors: Yao Xiao Yang , He De Qiang , Chen Jian Xiao , He Guo Liang
Published: March 2013

There are large number of mechanical, electrical and auxiliary devices, and many sensors and intelligent nodes in urban train. The coupling relationship among onboard nodes becomes more and more complex, and various safety detection and information system demand train communication network higher performance. All of these variations need security detection sensor network which has high real-time, bandwidth and interoperability, good maintainability and expansibility. As the existing train communication network transmission rate is low, large capacity status and fault diagnosis data, the event log data, audio and video data which are stored in different vehicles equipments, and cannot be efficient and timely processing. So, it is difficult to realize the information transmission and processing, fault diagnosis and intelligent maintenance of train set. Based on the train level and vehicle level Ethernet network, this paper will focus on network construction technology of large volume onboard security detection sensor network. The research results will help to improve performance of urban train.
Selective Flocculation of Fine Grain Oolitic Hematite Behavior Research
Authors: Niu Fu Sheng , Miao Chen , Zhang Jin Xia
Published: March 2013

The fine oolitic hematite ore (<20µm) is easily covered by the ore slime, therefore, it is processed very difficultly with traditional crafts, for example, gravity treatment, magnetic separation, and flotation. The tiny iron ore is unable to recycle effectively, bring about a large of useful minerals running off. It is indicated that the selective flocculation is effective separation craft in many research works. The good dispersion of fine particles is the selective flocculation essential condition, the excessive dispersion will destroy the selective flocculation, at the same time it can be influenced by the water quality, pH, the mixing time, the shear rate and the dispersing agent dosage. In this paper, to oolitic hematite ore, the chemistry dispersion research is conducted to provide the foundation for further selective flocculation separation.
Separating the Anshan-Type Low-Grade Hematite Ore with Process of Gravity-Magnetic Method
Authors: Jia Qing Mei , Li Feng Jiu , Li Ying
Published: March 2013

According to the nature of the ore which containing hematite and magnetite,under the conditions,for example,ore grade is 24.07%,the first fineness of grinding -200 mesh is 50%，the second fineness of grinding -200 mesh is more than 95%, it is concluded that concentrating circuit consisting of first grind-Feebleness magnetic separation -high intensity magnetic separation，second grind-second-high intensity magnetic separation-shaking tables. Ultimately, A concentrate with a productivity of 19.35%，a grade of 65.89% TFe and the recovery of 52.32%was yielded.
Conveying Property of Injection Pulverized Coal into Blast Furnace
Authors: Song Chun Yan , Gui Yong Liang , Hu Bin Sheng
Published: March 2013

The dynamic characteristic parameter of conveying property of pulverized coal is described with the conveying mass of pulverized coal in unit time. The conveying process of pulverized coal is studied by means of the pulverized coal’s conveying property testing equipment developed by ourselves. Results show that the conveying property of bituminous coal is better than anthracitic coal. If the improvement of conveying property of pulverized coal is considered purely, the size of pulverized coal can properly be reduced and the proportion of anthracitic coal can properly be decreased. The water content of pulverized coal can be controlled from 1% to 2%.
Assembling Variation Analysis Based on Power Balance Method for Sheet Metal Parts
Authors: Xing Yan Feng , Lu Xin , Wang Yan Song
Published: March 2013

Sheet metal parts are widely used in auto body and airplane body. As the method of influence coefficient cannot accurately analyze the relationship between part deviations and assembly variations, this paper proposes a new variation analysis model based on a method of power balance for sheet metal parts. The simple metal planes are loaded to fixtures according to the principle of “4-2-1”; and then variety of part deviations is analyzed during assembly process. The analysis shows that the welding guns do same work during welding process. Based on the above, this work establishes sensitive coefficient matrices between part deviations and assembly variations. Finally, two Z-shape sheet metal parts illustrate the assembling variation analysis process and the results indicate the accuracy of the method of power balance.
Review and Perspective: Sensory Feedback in Upper Limb Prosthesis
Authors: Zhang Peng , Xu Qi , He Ji Ping
Published: March 2013

An emerging challenge in developing intelligent prostheses is to replicate or recreate the sensory functions of natural limbs for amputees. Such functions mainly include tactile sensation and proprioception. This paper reviews the tactile receptors and proprioceptors in human upper limb, the artificial sensors in upper limb prosthesis, and the sensory feedback technology used for reconstruction of lost sensory function in the amputee’s upper limb.
The Pulse Electrolysis Treatment of Waste Emulsion Orthogonal Experimental Study
Authors: Sun Xiao Yan , Pan Pei Dao , Wang Jang Jie
Published: March 2013

This mechanical processing waste emulsion for the study, handled by pulse electrolysis. Arrangements by orthogonal testing, experimental study on plate distance (d), current density (i), the pH value and the pulse width (tP) impact on COD removal efficiency, very poor analysis of test data to determine various factors affecting the COD removal efficiency of primary and secondary sort: pH value > current density > pulse width > plate distance, optimal operating conditions. Orthogonal experimental data derived from regression analysis, determination of cross of quadratic polynomial regression equations, mathematical model. Tests confirmed that pulse electrochemical method for treatment of waste emulsion with low energy consumption, short response time, and other advantages, strong applicability of wastewater, building mathematical models, providing theoretical basis for subsequent design.
A Comparative Study of Fatigue Performance to Resist Reflective Cracking among three Different Stress-Absorbing Materials
Authors: Wang Hui
Published: March 2013

Through full-scale fatigue test, a comparative study of the ability to resist temperature fatigue and load fatigue was performed among high elasticity rubber mastic stress-absorbing band, fiberglass-polyester paving mat and SAMPAVE stress-absorbing layer, which were technologies to prevent reflection cracking. And they were verified by engineering. The results suggest that the overlay structures with the old cement concrete pavement partially treated with high elasticity rubber mastic stress-absorbing band are of the best fatigue performance to prevent reflection crack caused by load, and its temperature fatigue performance is equivalent to the overlay including SAMPAVE stress-absorbing layer. At the same time, Rubber Mastic Stress-absorbing Band is the most economical way.
The Synthesis and Characterization of 1-methyl-3-butyl imidazole Tetrafluoroborate
Authors: Tian Peng , Zeng Jing , Zhao Zhi Gang , Meng Bo , Qin Tian Ling , Sun Lu
Published: March 2013

1-methyl-3-butyl Imidazole chloride is prepared by 1–methyl imidazole and chlorinated n-butane. The synthesis reaction of 1-methyl-3-butyl imidazole tetrafluoroborate is in the acetone. The solubility of NaBF4and BMIC in acetone is not large, but due to the insolubility in acetone of reaction product NaCl and continuous precipitation from the liquid phase in the reaction process, so as to promote the reaction continuously towards forward direction. The colorless transparent and odorless BMIBF4are gotten. We use infrared spectrometer for the structure characterization, it is proved that we have gotten BMI-BF4room temperature ionic liquids. BMIC ionic liquid has better solubility in H2O, ethanol, ethyl acetate, acetone, acetonitrile, and methanol, and is insoluble in the ether and cyclohexane.
Investigation of Magnetic Behavior of SmCo5/SmCo2 Nanocrystalline Magnets
Authors: Li Li Ya , Yi Jian Hong , Li Ai Kun , Peng Yuan Dong
Published: March 2013

Nanocrystalline magnets (SmCo5)94(Cr3C2)6 were prepared using melt-spinning and their magnetic behaviors were investigated by studying their structures and magnetic properties. The alloys prepared using rapid solidification consisted of SmCo5 matrix phase, MgCu2-type SmCo2 secondary phase, and small traces of Sm2Co7 phase. The solidification with higher wheel speed were found to be preferable for the formation of single SmCo2 secondary phase. Relatively high coercive values of 28–36 kOe and high reduced remanence of 0.78–0.79 were observed for the SmCo5/SmCo2 nanocrystalline magnets. The shape of the corresponding magnetization curves revealed that two magnetization processes, nucleation and pinning of domain walls, took place in these magnets. The Henkel plots indicated strong inter-grain exchange coupling effect in these ribbons, consequently resulted in the phenomena of domains interacting with each other and enhancement of the remanence in the ribbons.
Optimization of Liquid Culture Conditions of Methamidophos Degrading Enzyme from Staphylococcus rosehbach
Authors: Zhang Na , Guo Qing Qi , Liu Xiaofei , Song Kun , Wang Shuang , Wang Mei Xing , Li Shuang , Yu Tong
Published: March 2013

The nutritional parameters of methamidophos degrading enzyme, which is isolated from soil from Daqing and identified as Staphylococcus Rosehbach, were studied by response surface methodology (RSM). Glucose, peptone and culture time were analyzed by Box-Behnken design for optimizing their concentrations in the medium and the effect of their mutual interaction on methamidophos degrading enzyme activity. Glucose and soybean protein were found in influencing the methamidophos degrading enzyme activity highly significant. Glucose and soybean protein also showed an effect on the methamidophos degrading enzyme activity in interaction with other variables. The optima values of the parameters obtained through RSM, 0.31% glucose, 0.09% peptone and culture time 72h were applied. Actual value of verifiable experimentation was that the degradation ratio of methamidophos degrading enzyme to methamidophos was 39.8% at the optima conditions.
Numerical Simulation of the Cigarette Smoldering Process
Authors: Jiang Wei , Li Bin , Feng Zhi Bin , Luo Deng Shan , Yu Chuan Fang
Published: March 2013

Cut tobacco was thermodynamics analyzed as infinitesimal volume, and the equation of energy conservation was built. The process of the burn front moving forward for 1 second(s) could be thermodynamics analyzed and another energy equation was also built. Then, the two equations were combined to get the smoldering velocity, which would be added into the mass, momentum, energy equation which was used to describe the whole burning process. The mass, momentum, energy equation was solved by the CFX software, and the results showed that: 1) After a cigarette ignited, the combustion process was accelerated firstly, then the process became slow and at last be at steady state. 2) Paper diffusivity play a critical role in determining the temperature of the smoldering cone, and the results were in good agreement with the experiment results.
Influence of Cutting Parameters on Achieved Geometric Tolerances in Rotary Ultrasonic Drilling of Al2O3
Authors: Samardžiová Michaela , Pokorný Peter , Zvoncan Marek
Published: March 2013

Submitted article deals with the impact of the cutting fluid´s pressure on the deviation from circularity. In submitted article an experiment is described when the pressure was changing from 15 to 25 bar in drilling of Al2O3 with ultrasound among other variables, feed and rotational speed. The aim of experiments was to define how the value of circularity of the hole is changing in different depths of machined hole. There is a dependence in USM process where the hole´s perimeter is rising with the depth of hole, however there was no knowledge in this problematics in RUM process. According to results from experiments it can be concluded, that the deviation from circularity is rising with the depth of a hole. The parameter influencing the deviation the most is cutting fluid´s pressure as was expected.
Plastic Deformation Behavior of High Strength Cast Aluminium Cylinder in Hot Power Backward Spinning
Authors: Guo Z.H. , Wang E.L. , Zhao Gang Yao , Zhang R.Y. , Fang P.
Published: March 2013

The hot power backward spinning(HPBS) of the high strength cast aluminums (HSCA) cylinder is a complex metal forming process. To analysis the plastic deformation of HSCA cylinder in HPBS process, a 3D coupled thermo-mechanical FE model of the process was built under the ABAQUS/explicit environment based on the solution of several key techniques, such as heat boundary condition treating, material properties definition, ALE adaptive meshing technology, etc., and verified by theoretical evaluation. Then simulation and analysis of HPBS of the process were carried out. The results show that the strain gradient which leads to the serious inhomogeneous deformation is produced in the thickness direction of the workpiece during the process.
Research on Elastic Scattered Wave of Submerged Elastic Plate
Authors: Chen Wen Jian , Sun Hui , Sun Tie Lin
Published: March 2013

It is proved by theory and experiment that the arrival time of elastic scattering wave is determined by group velocity of Lamb wave in plate and the speed of elastic scattering wave in water. The frequency dispersion equation of Lamb wave is derived for submerged elastic plate, and the phase velocity and group velocity dispersion curves are obtained by numerical calculation method. It is found that the phase velocity is greater or less than the group velocity at different frequency-thickness products. The energy propagation speed of wave is group velocity, so the arrival time of elastic scattering wave is determined by group velocity of Lamb wave in plate and the speed of sound in water. Experimental results show that elastic scattering wave is ahead of or behind the edge wave in echoes of elastic steel plate. The experiment results confirm validity of the theoretical analysis results.
Research on Silicone Zoom Lens Group to Keep Image Surface Stable
Authors: Zhao Cun Hua
Published: March 2013

In micro lens, the adaptive lenses are potential breakout in the future. The adaptive liquid lenses had been reported in several literatures. However, it’s regret for existing adaptive liquid lenses who can’t realize zoom synchronously keeping the image surface stable. For solving the problem a pair of all-silicone lenses called lens group was put forward. The lens group was firstly fabricated and assembled. The lens group was researched from theoretical calculation to find the synchronous relation between the front lens and the back lens. At last the lens group was seriously tested including its total focal lengths and image surface drifts. The theoretical researches and the testing result testified the all-silicone lens group was possible to facilitate the adaptive lens into applications.
Numerical Analysis on Delta-Ring Seal Structure of Ultra High Pressure Vessel Employed in Food Processing
Authors: Li Rong Li , Liu Xiao Yong , Zhang Shou Qin , Li Tao , Ren Guo Jing
Published: March 2013

Due to the characters of the ultra high pressure vessel employed in food processing, a seal structure was introduced in this study. Then numerical analysis was performed using the larger finite element stress analysis software ansys12.0 for the stresses of the seal structure under internal pressure. In order to solve the contact question of delta-ring seal structure by using face-face contact model, a 3-D axisymmetric solid element was employed to calculate the stresses of the connected location among delta-ring, blind cover and end cylinder, the mises stresses in this structure were analyzed. Thus, the distribution nephograms of the stress on the contact surface were obtained in different conditions. Full-field plastic deformation of seal structure was generated when the inner pressure was larger than 300Mpa. At last, the reason for residual deformation was analyzed.
Asphalt Paving Temperature Field Analysis of Concrete Box Girders
Authors: Hao Xian Wu , Duan Rui Fang , Yang Ji Peng
Published: March 2013

In recent years, asphalt concrete pavement has been widely used in the deck pavement of highway bridge, the maximum temperature usually reaches up to 150°C.Such a high temperature can cause the disadvantageous temperature field in the box girder. Temperature field of paving asphalt is related to some factors. The finite element method is employed to analyse of the effect such as initial temperature of girder, blanking temperature of asphalt, thickness of asphalt. The results can guide design to reduce crack.
Researches on the Stability of Deeply-Buried Water Diversion Tunnel Based on Strength Reduction Method
Authors: Jun He
Published: March 2013

In view of the complexity of the deeply-buried water diversion tunnel and adopting the advantage of slope strength reduction method, this research takes advantage of strength reduction method to study the stability of diversion tunnel. Based on the instance of Jinping II hydropower, this paper analyzes Yantang Formation III surrounding rocks buried 2500m deep below the ground, adopts the Mohr-Coulomb criterion, takes the cavern displacements or relative displacement as buckling critical criterion, and finally concludes that the safety factor is 1.5 in this instance, not far from 1.2 in the norm. It is thus reasonable to use strength reduction method to study the stability of the deeply-buried water diversion tunnel. The method can get safety factor easily and objectively and can provide scientific basis for evaluating the deeply-buried water diversion tunnel and the design for the supporting structure.
Determination on Interlayer Separation Threshold of Complex Roof with Mechanics Properties
Authors: Wu De Yi , Nie Liu Yang
Published: March 2013

In order to determine interlayer separation threshold and separation stability of complex roof, distribution of interlayer separation was analyzed in different conditions by a contact element method based on nonlinear contact theory in ANSYS program. The conclusion was drawn that normal stress was tension stress in the center of construction surface in deep mining and it could be considered as interlayer separation threshold of complex roof.
Control of Structural Vibration Using Shunt Piezoelectric Materials
Authors: Mao Qi Bo
Published: March 2013

In this study, structural vibration control using semi-active shunt piezoelectric damping circuits is presented. A piezoelectric patch with an electrical shunt circuit is bonded to a base structure. When the structure vibrates, the piezoelectric patch strains and transforms the mechanical energy of the structure into electrical energy, which can be effectively dissipated by the shunt circuit. Hence, the shunt circuit acts as a means of extracting mechanical energy from the base structure. In this study, a pulse-switching circuit is imposed as the semi-active shunt piezoelectric damping to reduce the structural vibration. The switch-law for the pulse-switching circuit is discussed in detail, and the detailed numerical calculations are given and discussed. It is found that the pulse-switching circuit is more stable than passive piezoelectric circuit (such as RL series circuit) with regard to structural stiffness variations.
The Study of Using Ultrasonic Sensors to Detect Degradation Characteristics of the Ferrite Core
Authors: Sung Min Suk , Lee Su Ho , Bae Seung Deug , Park Jae Hyun
Published: March 2013

Severe temperature changes on electrical devices which are used ferrite cores causes very little degradation inside the core. In this paper was done to find out the size of the piezoelectric vibrator size and the most appropriate frequency In order to detect the degradation characteristics of the ferrite core. In this experiment, the frequency was used 1MHz,2.35MHz,5MHz, and the vibrator size was used 0.25inch,0.375incn,0.5inch. And the time axis variation was measured.
Object Tracking and Positioning Based on Stereo Vision
Authors: Zhou Zhong Wei , Xu Min , Fu Wei , Zhao Ji Zeng
Published: March 2013

The goal of this paper is to present a method for object tracking and positioning based on stereo vision in real time. The method effectively combined stereo matching algorithm with object tracking algorithm, and calculated the spatial location information of the object by using binocular stereo vision while the object is being tracked. The stereo matching used dynamic programming, image pyramids and control points modification algorithm, and the object tracking mainly utilized CamShift algorithm in this paper. The experimental results have confirmed that the proposed method realized real-time tracking for moving object, accurate calculating for the object three-dimensional coordinates, which meet the applied needs of servo follow-up system.
An Electronic Transformer Calibrator Based on Multiple Approaches
Authors: Pan Bao Xiang , Mao Shuo Nan , Li Lin
Published: March 2013

With electronic transformers gradually being launched on the market, there is still no unified standard for electronic transformer calibration in China. According to this situation, two methods for electronic transformer calibration, the direct method and the difference method, were studied in this paper. Based on the virtual instrument technology, a novel electronic transformer calibrator compatible with both the direct method and the difference method was designed. This system is able to meet the calibration needs for electronic transformers with digital output and analog output at the same time. While using the spectrum leakage compensation algorithm, the calibration accuracy of this system is also enhanced.
Diagnosis and Treatment of Misalignment for a Desulfurization
Authors: Guo Yu Jie , Zhang Wen Tao , Shi Feng , Suo Na
Published: March 2013

After changing the bearing box on a desulfurization booster fan, its horizontal vibration value is over 185μm beyond the standard. Through the test, it is decided that fan diaphragm coupling misalignment is the main reason for vibration. The vibration eliminates after readjusting the center.
Multi-Channel Temperature Detecting System Based on AT89S52
Authors: Wang Shou Bin , Gong Wei , Su Gang , Sun Hong Yue
Published: March 2013

There arc many occasions we need to test its temperature in real time. This design is mainly studied the establishment and application of multi-channel temperature measurement system. In this paper, the authors introduce a multi-channel temperature detecting system which has a core of single-chip controller. The system measures the temperature by the temperature sensor, displays the temperature and deals with it on real time.The temperature detection system hardware circuit is simple, low cost, convenient temperature measurement, high measuring precision, and has better use value. The system is suitable for common occasions of multi-channel temperature measure, has great potential for development and practical significance．
Testability Evaluation of the Systems with Multi-Outcome Imperfect Tests
Authors: Zhang Shi Gang , Liu Cheng Rui , Hu Zheng , Wen Xi Sen
Published: March 2013

In the fault diagnosis systems, the measured value of a test is generally divided into several intervals to isolate the faults. Furthermore, in the realistic systems, the value may be distributed over different intervals with a probability if a fault occurs, which means that the tests are multi-outcome imperfect tests. In this paper, a calculation method of metrics of fault detection and fault isolation based on extended dependency matrix is proposed, which can be applied to evaluate the testability of a system and consequently play a role in the design process of diagnosis systems.
Research and Development of Nanometer Al2O3 Material Made for Rapid Detection of Gas Concentration Sensor
Authors: Li Hai Chen
Published: March 2013

Coal Face Gas Concentration Overrun Is the Leading Cause of China Coal Mine Fatal Gas Explosion Accidents Reasons. Therefore, Research and Development of Rapid Detection of Gas Sensor Can Avoid Gas Explosion Accident Key. this Paper Studies the Al2o3 Nanometer Powder Preparation Technology, by Doping Rare Earth Material so that the Gas Sensor Detection Element Surface Area Was Greatly Improved; its Sensitivity and Stability Are Greatly Improved. According to the Test Results Show that, the Rapid Gas Sensor for Methane Reaction Time Is 6 Seconds, Recovery Time of 8 Seconds.
Study on Remote Control Techniques to the Digital Storage Oscilloscope Based on VC and GPIB
Authors: Zhang Fa Quan , Xiao Xing Da , Wang Guo Fu
Published: March 2013

Some techniques of controlling remotely the digital storage oscilloscope are proposed including VISA, VXIplug&play drivers, TVC and IVI-COM drivers. By means of TekVISA, several application development environments can be used to develop functions of the digital storage oscilloscope. The programming language of Visual C++ is used to develop software. With the help of TekVISA and the dynamic link library, remote control to the digital storage oscilloscope through network is completed. All operations to the digital storage oscilloscope including parameters setup, data acquisition, waveform acquisition and storage, data processing are implemented in a remote place. The results show that the techniques of remote control are convenient and efficient and fit for experiments of scientific research and practical projects.
Measurement for the Ship Noise with a Single Vector Sensor
Authors: Lan Hua Lin , Lv Yun Fei , Shi Jun Jie
Published: March 2013

To suppress the interference of radiated noise from the other ship and improve the measurement efficiency, a new method of the measurement for the ship noise with a single vector sensor was proposed. The ship at different direction were classified via the DOA estimation with a single vector sensor, then the radiated noise from the special ship was accumulated. The experiment of measuring the ship noise with a single vector sensor was conducted in the Yellow sea of China in the summer of 2010. The results showed the validity of the given method.
Analysis of Synchronization Angle Precision in RCS Measurement and its High Speed Synchronous Pulse Implementation
Authors: Chen Dong , Wang Hua Pei , Guo Qing
Published: March 2013

To meet the demand for high precision measurements of radar cross section (RCS) in microwave anechoic chamber, the effect of angle repeatability of position servo system in background cancellation technology is analyzed and its error mathematical model is presented. Then a method of high speed synchronization angle measurement based on CPLD is proposed, which improves the precision of synchronization angle measurement in any fixed angle interval. The experiment results show that this method can effectively solve the accuracy of target RCS when rotating.
Gear Fault Diagnosis Based on Time Synchronous Average and Envelope Analysis
Authors: Li Yun , Gao Yan , Guo Jun , Yu Xian Jun , Liu Yan Xue
Published: March 2013

This paper proposed a new method of gear fault diagnosis in gearbox. Mainly it stresses on the combination of time synchronous average (TSA) and envelope analysis, using TSA technique to eliminate the random noises in the gearbox. Then, the clear rotation frequency, gear mesh frequency and their harmonics can be obtained through the envelope spectrum analysis. Simulation study indicates that this method can effectively detect the gear faults with a high accuracy.
Application of the AE Technology to Fault Diagnosis in Gezhouba Dam Shiplock Mechanical Hoist Reducer
Authors: Zhao Xin Ze , Kang Xiao Ni , Zhao Mei Yun , Wang Rui Feng
Published: March 2013

Acoustic emission detection principle was used in testing the working status of Gezhouba Dam ship lock mechanical hoist reducer. According to wavelet analysis technology, high frequency signals of the acoustic emission is decomposed and reconstructed so as to eliminate noise and improve the signal-to-noise ratio. Then the Hilbert envelope transformation analysis is adopted to identify fault information. The results show that wavelet envelope spectrum analysis of the acoustic emission signals can be effectively used in fault diagnosis of reduction gearbox.