bluuebunny/crossref_metadata_2025 huggingface dataset:
An Empirical Analysis of Developer Collaboration Network
Authors: Peng Cheng Xiang
Published: March 2013

To further verify the uses of bipartite network theory and understand the intrinsic nature in social collaboration network. In this paper, we get the information of open source software projects from Source-Forge web and construct a project management collaboration network by analyzing the data of project and manager. Then, through the ordinary projection two kinds of one-mode network are made and the degree distribution of one-mode network and origin bipartite networks shows a power-law like. Finally we evaluate the node's importance on manager network to acquire the core nodes, namely domain experts, by using the metric of node degree, between and topological potential respectively, and provide some helpful applications.
The Simulated Calculation of the First Order Buoyancy Force under Different Relative Permeability of Ferrofluid
Authors: Li Qiang , Yuan Zuo Bin , Yang Yong Ming , Hu Cheng
Published: March 2013

In this paper, the first order buoyancy force of ferrofluid is simulated calculation under external magnetic field in ferrofluid devices. The relationship between first order buoyancy force and displacement of nonmagnetic body under different relative permeability of ferrofluid，and the relationship between first order buoyancy force and relative permeability of ferrofluid are obtained.
Cloud-Based Bayesian Inference for Online People Health Status Assessment
Authors: Ho Chen Shie , Lin I Po
Published: March 2013

The applications on assessment of people health status by using physiological monitoring and measurement platform have sprung up in recent years. How to design an assessment tool and provide the diagnosis result to the users by analyzing received fusion data from user side and the given domain knowledge is a critical issue in such application. This study will focus on cloud-based medical decision analysis by constructing inference model derived from incremental Bayesian network. The Bayesian network is established by physiological data retrieved from users, and the obtained report of the health status assessment can be used to facilitate user's self-health management and disease prevention.
General Design and Implementation of Heterogeneous Data Conversion Tools
Authors: Cheng Jian Hui , Jin Cheng , Zhao Ran
Published: March 2013

We will undertake an in-depth analysis of the data conversion,and take a detailed study of thoughts and realization methods of data conversion. On the basis of methods above-mentioned,we design and implement the sofeware of the data conversion between the heterogeneous databases of MS SQL Server,Oracle,Access,Excel.
A Study of Using Webcam in Computer Classroom Implementation and Research of a Real-Time Monitoring System for Computer Classroom
Authors: Lee Wan Chun , Hung Chir Neng , Hwang Ming Dar , Huang Tzu Hua , Liu Yuan Chen , Cheng Chia Che
Published: March 2013

The webcams are installed on students’ LCD monitors to take, via an ordinary video processing program, the half-length pictures of students in a real-time manner whenever they are distracted from the class or not in their seats. Result shows that the grades of the students in the experiment group become less scattered. This means the difference among students’ grades have been reduced and students’ overall grades have also been improved.
Implementation and Research of a Real-Time Monitoring System for Computer Classroom
Authors: Lee Wan Chun , Hung Chir Neng , Hwang Ming Dar , Huang Tzu Hua , Liu Yuan Chen , Cheng Chia Che
Published: March 2013

In this study, a system is designed using the local network in a computer classroom to monitor students’ learning situation and classroom order in a real-time manner. Teachers can use a network management program to monitor students’ use of computers. A questionnaire on the installation of computer classroom monitoring system is created after a post-test is administered to the experiment group. The result shows that 59.52% say that pay more attention to what teachers teach in the class.
Data Storage Layout for Object-Based De-Duplication System
Authors: Yan Fang , Tan Yu An
Published: March 2013

The world is increasingly awash in more and more unstructured data. Object-based data de-duplication is the current most advanced method and is the effective solution for detecting duplicate data. We developed an energy saving policy for conventional disk based RAID systems. According to the characteristics of object-based data de-duplication, we introduce object layout strategies for unstructured data applications; disk accesses are concentrated in a part of the disks in a long time which is conducive to scheduling other disks into standby or shutdown mode. Our proposed methods reduce energy consumption of de-duplication storage system.
The Empirical Research of Behavior Induction and Dynamic Reports in the Laboratory Information Management System
Authors: Wei Gu , Peng Wen Yu
Published: March 2013

According to the survey of needs of laboratory management system, teachers and managers have behavior induction role to students’ study. So we set up a laboratory management system with the background of cloud and the internet of things, and design dynamic reports works in the system, including database design and report output format. And analyze user’s behavior induction role through the system.
Based on Hurst Parameter Estimation DoS Detection
Authors: Shu Heng
Published: March 2013

Most researches regard the real traffic has self_similarity,so traditional model based passion or Markov can’t adapt to the real traffic.In order to resolve these problems,the estimation is used based on Hurst parameter to detect DoS attack,researching on the affect of Hurst paramerter change brought by DoS attack,By analyzing the 1998 DARPA intrusion detection evaluation dataset show that this method detect DoS attack,and is more reliable on the recognition of all kinds of DoS attack than any other method based on measure precision.
A Dynamic Management Information System Based on ZigBee Technology for Instruments and Equipments of Experimental Centre
Authors: Liu Wei , Zhang Jun , Yang Cheng Jian , Yang Yi , Chen Xing Du , Hao Yun Tao
Published: March 2013

Based on ASP.NET 2.0 framework and ZigBee wireless sensor network, a dynamic management information system for instruments and equipments of experimental centre was designed and developed. Electronic labels were equipped to the object instruments and equipments, and the information was obtained by using ZigBee and Ethernet protocol. The platform of dynamic management was constructed through collecting real-time information of the instruments and equipments in a timely manner. At the university level, the system is coordinated with specified framework of instruments and equipments under the management of State-Owned Assets Department to accept the supervision and inspection by higher level departments. At the college level, it is subdivided to instrument and equipment status (e.g., acquisition/scrap, lent out/returned, running state/using rate, etc.) to realize fast and convenient inquiry about their current inventory status, and their utilization efficiency in the experimental centre is increased to serve students and faculties better.
Automatic Marking about T­-SQL Based on One­way Close Degree
Authors: Chen Huan Tong , Zheng Wei , Chen Yao Fei
Published: March 2013

This paper puts forward a method to realize Transact­SQL (T­SQL) automatic test paper evaluation, using one­way close degree to calculate the degree of similarity between the candidate answer and standard answer to realize automatic evaluation. And it introduces the grammar and structure of T­SQL briefly, details the definition of one­way close degree, and analyzes and realizes the one­way close degree algorithm. The comparison of automatic marking and manual marking examples shows that, automatic marking is close to manual marking.
Attitude Indicator in Aircraft Cockpit Based on ARM
Authors: Jia Yin Liang , Gao Jing
Published: March 2013

Display device is an important aircraft instrument to give airman swift and precise information. Attitude indicator is a typical picture which consumes more time on generating graphics than other pictures in aircraft cockpit. This paper presents a display device based on ARM. ARM generated and anti-aliased graphics using double frame buffers and overlapped them to input video. A filling algorithm was proposed to decide the color of a pixel in filling area, according to the connection between the pixel and horizon or outline. The display device decided the pixel color without writing the data into buffer. The algorithm reduces memory access and calculation, so the display device could generate an attitude indicator picture in 16.6ms which resolution is 1600×1200.
A New Security Baseline Reinforcement Method for the Power Information System
Authors: Gao Shan , Wang Qi Qi
Published: March 2013

Power information is a typical distributed interconnect system, faced with a complex network security problems. It still lacks a systematic method for the design and evaluation of system security. The authors comprehensively survey the layout of the power network and also ISO27001 international standards, and proposed a new security baseline reinforcement method for the power information system. By using the multi-class fuzzy comprehensive judgment model and the SSE-CMM method, the authors proved the reinforcement method is reliable in theory. This method combines ISO27001 PDCA model with the security baseline testing process, and applies ITU-T X.805 security architecture to the testing indicators extraction process, which makes the security evaluation process for the power information system quick and practical.
Study on Security Problems of the Internet of Things
Authors: Li Xue Mei , Ge Liang Quan , Xin Zhang Jian , Chen Chuan
Published: March 2013

Internet of things is a worldwide network which based on mass micro-devices, using the new generation as the backbone, and will be used in traditional and emerging industries. The possibility of seamlessly merging the real and the virtual world, through the massive deployment of embedded devices, opens up new exciting directions for both research and business. In this survey article, we provided an overview of the key issues such as security problems related to the development of IoT technologies and services.
The Ranking of Deep Web Sources Based on Data Quality
Authors: Yin Hu , Lv Yun Fei , Wang Wei Wei
Published: March 2013

Deep Web technology makes a large number of useful information which hidden behind the interface easier to be found by users. However，with the increase of data source , how to find a suitable result quickly from a number of sources is becoming more and more important. In this paper, we start discussing from the quality of the data, setting 6 quality standards for the data source and giving the method of calculation. Meanwhile, we solve corresponding weight vector of quality standards by the feeling of the users; and based on this quality standards, we calculate a random data source according to weight vector to gain a general score. Then this paper discusses the sampling theory and proposes a reasonable sampling method for the experiment. The experiment result shows that it is of good veracity and operability to evaluate and score the data quality of data source according to sampling analysis.
Virtual Reality Applications Force Feedback Device in Hand Rehabilitation Training
Authors: Yeh Shih Ching , Hwang Wu Yuin , Liu Wen Kang , Huang Tzu Chuan
Published: March 2013

In response to the introduction of new generation technology into rehabilitation therapy, new methods and effective management approaches specifically for rehabilitation therapy are in urgent need presently. Our lab has developed a 3D virtual game environment for training which mainly integrates 3D images, active touch, and other related information. Mainly consisting of a motor rehabilitation system and a series of 3D simulated flight games, the system aims to achieve rehabilitation of pronation and supination of the arms through the patient’s control and continuous exercise. In this study, social psychological variables are used to evaluate the human-computer interaction process.
Research on Construction Technology of Self-Monitoring Asphalt Concrete
Authors: Huang Shao Xu , Sun Chang Jun , Tang Ning , Pan Pan , Wu Shao Peng
Published: March 2013

Self-monitoring asphalt concrete has a good strain and damage self-sensing behavior. We can evaluate the structural health and service life of asphalt concrete by the monitoring of damage. In this paper, some construction technology research, including electrode arrangement, temperature control, mixing technology, transportation requirements, compaction technology, has done through the paving of self-monitoring asphalt concrete test section. The results of research provide a reference and guidance for construction of self-monitoring asphalt concrete in future.
Study on Low-Temperature Properties of Self-Monitoring Asphalt Concrete
Authors: Sun Chang Jun , Huang Shao Xu , Tang Ning , Pan Pan , Wu Shao Peng
Published: March 2013

With the self-diagnosis function of the self-monitoring asphalt concrete, we can evaluate the health status of pavement according to feedback on the electrical signals when it is under variation load. In this paper, indirect tensile test and flexural modulus test were used to study the low-temperature properties of self-monitoring asphalt concrete. The test results show that the performance of self-monitoring asphalt concrete has a strong sense of temperature. The result of low-temperature properties provides a reference for the further study of self-monitoring asphalt concrete.
The Influence of Composition on Morphology, Structure and Magnetic Properties of Ni-Co Films on Aluminum Prepared by Electroplating Method
Authors: Hu Yong Jun , Cao Dong , Li Xi Qiang , Zheng Hui Ting , Cheng Xiao Ling , Xiao Xiao Ting , Zhang Hai Yan , Li Feng , Chen Tian Li
Published: March 2013

In this paper, Ni-Co alloy films with different composition were obtained by means of electroplating method. The morphology, structure and magnetic properties of Ni-Co alloy films with different Cobalt content are evaluated. The effect of the crystal orientation on the morphology of Ni-Co deposits with different compositon was discussed. The results showed that Ni–Co alloy films with Cobalt content decrease is composed of pyramidal, spindly, mixed pyramidal and spindly, and cellular particles respectively. To the deposits with similar composition, change of morphology is related to the preferential orientation. With the increase of the Nickel content, the saturation magnetization (Ms) value of the Ni–Co alloy films increases and then decreases sharply. The coercivety (Hc) value of the Ni–Co alloy films decreases with the Nickel content increase.
Experimental Research on Dressing of Tin-Iron Ore
Authors: Yuan Su Juan , Shen Zhi Yong , Lu Xiao Long
Published: March 2013

Based on studying of ore property and tests, the suitable mineral processing flowsheet for the tin—iron ore had been determined. Better technical and economic indexes had been achieved: the iron concentrate grade reached 64.45%, and the tin concentrate grade reached 13.06%. It gave a technical reference to rational development and utilization of such kind of tin-iron ore resource.
Improvement of Method for Determination of Isocyanate Group Content in Polyurethane Prepolymer
Authors: Ji Wen Jin , Song Wei , Zheng Yu Ying , He Xiang Zhu
Published: March 2013

This paper represents the improvement of method for determination of isocyanate group content in polyurethane prepolymer. Acetone-dibutylamine method and toluene-dibutylamine method were used separately to determine the isocyanate group content in polyurethane prepolymer. The –NCO content tested by the two methods were close. In the former method, 15-20 mL acetone was used as solvent and the titration end point was easy to confirm. While in the latter method, additional solvent (isopropanol) was used which causes environmental contamination.
The Research of Splitting Craft for Air Filter with Sea-Island Superfine Fiber Needled Fabrics
Authors: Jing Ling Xiao , Sun Sheng , Wang Xin , Zhang Cai Qian
Published: March 2013

Although the bag-type dust collector is dust capture equipment which is low cost and high efficiency, it has less filter efficiency to ultra fine particles for its of thicker fiber. So ultrafine fiber were used by bicomponent fiber with splitting craft to improve the filtration efficiency of ultra fine particles greatly. A piece of polyester/nylon sea-island superfine fiber needled nonwovens were splitted processing for nine times by the orthogonal design. And fibre microscopic photographs, weight loss rate and strength were analyzed. The best choice of splitting craft as followed: lye concentration is 16%, splitting time 15 min and splitting temperature is 95 °C.
The Research of the Preparation and Characterization of Selective Flocculant Suitable for Fine Hematite
Authors: Zhang Jin Xia , Zhang Da Yong , Li Huai Xiang , Niu Fu Sheng
Published: March 2013

This paper, a comprehensive analysis of selective flocculation am fine hematite selected based on the combination of soluble starch and the characteristics of acrylamide was prepared soluble starch - grafting of acrylamide polymer flocculant. Conditions of single-factor experiment studied the conditions on the starch - the impact of acrylamide polymerization and to the level of starch graft ratio to measure the various conditions on the polymerization to determine the optimal conditions of each are as follows: initiator using cerium nitrate Ammonium; initiator concentration 0.001moL / L; AM / soluble starch mass ratio of 2:1; reaction time of 2h; the reaction temperature is 60 °C. In terms of single-factor test, designed a four factors and three levels of the orthogonal test, the optimum conditions are: starch and monomer mass ratio of 1:2; initiator concentration of 0.001 mol / L; the reaction temperature is 65 °C; reaction time was 1.5h. Under these conditions, starch and the grafting rate of 153.24. By scanning electron microscopy and infrared spectrum we can see, the namely, the resulting polymer soluble starch and acrylamide graft copolymer. By hematite flocculation test we can see, with flocculants prepared by flocculation, its ability to better than selective flocculation.
Research on the Inhibitory Activity of Endophytic Fungi in Huperzia serrata against AchE
Authors: Li Na , Zhu Zi Ping
Published: March 2013

Twenty-two endophytic fungi in the Huperzia serrata were separated to test their fermentation broth. Research found that seven of them could produce alkaloid. Of these, the fermentation products from the T4 bacterial strain produced the most, with 2.027 mg/g. Ellman colorimetry has determined that the fermentation broth in four fungi had inhibition activity against AchE. It also showed that the total alkaloid of the T17 bacterial strain had a half-inhibitory concentration (IC50) of 98.494 μg•mL-1 on the mouse’s brain against AchE. This yielded the conclusion that the total alkaloid in the T17 fermentation broth restrains AchE effectively, and that it further contributes to the separation of its active ingredient.
Microwave Heating in Iron Ore Magnetization Roasting the Current Status
Authors: Xu Ben Jun , Chen Kun , Huang Cai Juan
Published: March 2013

This template explains the principle of microwave heating and iron ore magnetization roasting principle. Moreover，it summary analysis microwave heating in the use of iron ore magnetization roasting and points out that we should strengthen the study on microwave heating mechanism.
Modified ANN Inverse Compensating Method for Two-Dimensional Sensor
Authors: Ding Yu Han , Liu Guo Hai , Dai Xian Zhong
Published: March 2013

To improve the dynamic performance of the two-dimensional sensors, we presented a modified ANN (artificial neural network) inverse compensating method. The modified method is based on the state-space equation, which can fully describe the complex sensor and make the obtained inverse compensator more accurate, as well as decrease the derivative orders appeared in the inverse compensator. Simulation result verifies the modified compensator is more suitable to be used to compensate the complex two-dimensional sensor and the compensating result of the modified method is better that of the unmodified one.
Numerical Simulation of Hydrodynamics in Slurry Bubble Column Reactor
Authors: Ning Chen , Wang Fang Bing
Published: March 2013

Gas dispersion and solid suspension in industrial size slurry bubble column reactors for producing sodium dichromate are simulated numerically by using of computational fluid dynamics (CFD). The Eulerian multi-fluid model and standard k-ε turbulence model are used to describe the flow behavior in bubble columns. The simulated results show that gas is easy to flow toward the centre of the bubble column and in relatively high local gas holdup there. Installing gas-re-distributors in the bubble column is favorable for gas dispersion. Solid suspension in the bubble columns under the operating condition we investigated is relatively uniform.
The Effect of Caulophyllum robustum on the Oscillation System
Authors: Zhao Wei Wei , Liu Dai Huo , Gao Jin Quan , Li Zong Xiao
Published: March 2013

The oscillation behavior was investigated in oscillation reaction system acetone-KBrO3-MnSO4-H2SO4 with Chinese herb medicine Caulophyllum Robustum as substrate. The effects of concentration of substrate, H2SO4, KBrO3, Mn2+ on the period, amplitude and life of oscillation were discussed and the action of each substance in the oscillation system was verified. It provided a new way for herbal medicine identification.
Forklift Hydraulic System Design
Authors: Yu Chun , Wang You Min , Zhao Chun
Published: March 2013

In order to improve design performance, shorten development cycles, reduce production cost, designed the forklift hydraulic system. By the analysis of the forklift tilting and lifting process, the forklift hydraulic system schematic is made. Based on the schematic, designed and calculated the size and operating parameter of hydraulic cylinder, the pump operating parameter, hydraulic valve operational parameter, hydraulic oil tank effective volume, pipe size, selected the appropriate hydraulic components, and checked the system pressure loss and temperature rise. The results show that the hydraulic system meets the requirements.
Numerical Scheme to Simulate Combined Mixing and Separating Newtonian Fluid Flow in a Channel
Authors: Khokhar Rahim Bux , Chen Y. K. , Calay R. K. , Xu Y
Published: March 2013

The paper presents a semi-implicit time-stepping Taylor-Galerkin pressure correction primitive variable finite element algorithm to simulate fluid flow for two dimensional planar combined mixing and separating geometry. Two cases; one with reversed channel flows interacting through a gap in the common separating walls filled with Newtonian fluids in both arms of the channels and other with unidirectional flows were modeled in order to examine the performance of the scheme. Steady solutions were obtained using unsteady finite element scheme. The influence of increasing inertia on variation in flow directions and varying flow rate configurations in both channel arms are studied in detail. The scheme is found to be fast, robust and stable for varying Reynolds number.
Engineering Design of Underwater Explosive Containment Vessels
Authors: Li Lin Na , Zhong Dong Wang , Zhang Chao
Published: March 2013

Underwater explosion vessel is the main equipment to experimentally study the law of underwater explosion by small quantity of explosive. It is the main equipment of explosive metalworking. In order to the safe using of underwater explosion container and the efficiency, we must accurately determine the strength of the container. Based on the actual engineering design, the brief summary about engineering design method of 10gTNT equivalent deep water explosion vessel has carried on.
Array Normalization Algorithms Applied to Qualitative Electronic Noses
Authors: Chen Zhou Ye , He Lei
Published: March 2013

In a qualitative electronic nose, different gas concentrations of the training dataset will have a negative effect on the correct recognition rate of the system. In order to reduce or eliminate the impact of the factor of concentration on the qualitative electronic nose, array normalization algorithms are proposed. In this paper, six different array normalization algorithms were studied and compared in different application cases. All of these algorithms are effective in increasing the correct recognition rate of the qualitative electronic nose and different algorithms are biased in favor of different application directions. The algorithms I II and III are most commonly used ones because of their stableness, the algorithms with global compression are better than the ones with local compression when more sensors are used in a array.
On the Interaction between Indoor Seat Design and Human Body
Authors: Meng Yan , Zhang Li , Ma Yu
Published: March 2013

Abstract. In the highly developed stage of economy, information, technology and culture, system research has been conducted on human, furniture, space as well as environment by ergonomics to have the indoor environment adapt to people’s demands on life activities and to raise both the social materials and spiritual life to a new level, which has brought new value to the design world. Focusing on the main line “human-space-environment”, the analysis for a series of psychological and physiological activities produced when people sit on the seat indoors have been conducted on the basis of ergonomics and environment-related behavior theory. So that people can create a safe, healthy, cozy and high-efficient working and studying environment actively in the environment design.
Natural Period of Masonry in-Filled R/C Frame Structures Tested in Earthquake Field Investigation
Authors: Yang Dong Hui
Published: March 2013

Masonry in-filled reinforcement concrete (R/C) structure is famous for its’ flexible space arrangement, easy construction and high force resistant capacity as well as its’ high ductility. However, in recent destructive earthquakes happened in China, more and more severe damages of masonry in-filled R/C frame structures have been observed due to either unreasonable design or unexpected-high ground motion exceeding the seismic design intensity mostly. In the field investigation for the 2010 Yushu Ms7.1 earthquake of China, 6 masonry in-filled R/C frame buildings, were in-situ tested by using the ambient vibration method. Both of the test results of the natural period for each structure as well as their damage mechanism were described and analyzed simply. The test results provide reference data for nonlinear numerical analysis and retrofitting of earthquake damaged RC frame structures.
Wireless Sensor Network Management Based on SNMP Protocol
Authors: Chen Wen , Zhou Ying , Wu Yun , Liao Xiao Fei , Ding Xing Ru
Published: March 2013

This paper proposes a network management scheme of WSN. With embedded technology and SNMP (Simple Network Management Protocol) agent technology, an embedded SNMP agent is designed. The agent abstracts a WSN device to a virtual device as a SNMP management node. The main advantage is that the agent supports SNMP to manage the network, and diverse embedded devices can be managed identically with the conventional Internet network management. Therefore, the scheme can reduce the cost of network management and simplify the operation. Finally, by experiments, the scheme is proved to be feasible.
Sensor Fault Detection and Identification Method with KPCA in the Process of Aero-Engine Ground Testing
Authors: Xu Tao
Published: March 2013

This paper focuses on Kernel Principal Component Analysis (KPCA) in order to solve the problem of sensor fault detection and identification without linear relationship between sensors. After samples are projected into high-dimensional space, new Principal Component Analysis (PCA) model is established in the kernel principal component eigenvector space. By the contrast with SPE, Hotelling T2 is an appropriate parameter to detect sensor fault because it is more sensitive to sensor failure. The contribution of different sensor to Hotelling T2 is utilized to identify sensor fault for the faulty sensor’s contribution is large than others significantly. Finally, the proposed method is illustrated by the sensors of oil-providing system in the process of aero-engine ground testing. Experiment results show the applicability and effectiveness of the proposed method.
A High Accuracy Tachometric Measurement Method of the Wheeled Mobile Platform Based on Equal Precision Technique
Authors: Meng Ling Yi , Wang Bing Xin , Wang Sun An , Yu De Hong
Published: March 2013

Wheeled mobile platform is a common structure of mobile robots and electric vehicles. If the wheels driven by individual motors can be accurately controlled, the mechanical construction will be simplified and the composed movement would be precise. The high accuracy tachometric control is based on precise measurement of each driving wheel’s speed. And the mobile platform introduced in this paper has simple structure with light weight and fast dynamic response. Therefore, the digital control cycle should not be long. When the wheels are traveling at a low speed and the sampling period is short, the measurement error would be great, using the traditional methods. We adopted multi-microprocessor and external circuit as the hardware, and chose equal precision method to measure the rotational speed. The results show that this system has achieved high accuracy measurement with errors within ±1‰, which would secure the latter precise control.
Background Leakage of Pressure Leak Calibration Caused by Temperature Change
Authors: Feng Yan , Zhang Rui Fang , Sheng Xue Min , Dong Meng , Zhao Lan
Published: March 2013

On laboratory conditions，background leakage caused by temperature change was one of the most important factors for affecting calibration of pressure leak, consequently, the constant temperature water bath of the calibration apparatus has been used to reduce background leakage by means of keeping the apparatus temperature constant. The method of active and passiveness were combined to keep constant temperature. through the research on experimentation, it was found that background leakage was decreased to the grade of 1.36×10-9Pam3/s when constant temperature been used, and meanwhile the lower limiting of pressure leak was extended to 2.667×10-8Pam3/s.
Compare Different Calibration Method of Pressure Leak
Authors: Zhang Rui Fang , Feng Yan , Zhao Lan , Sheng Xue Min , Dong Meng
Published: March 2013

This Research was based on domestic and international pressure leak calibration technology, respectively, constant volume method and constant pressure(two model: saw-tooth variation constant pressure measurement mode and digital PID measurement mode) were both used on identical pressure leak calibration, 10-6 Pa•m3/s level, then, measurement uncertainty analysis of each method and the calibration results were compared.
High Precision Online Measurement Technology to Large Diameter
Authors: Biao Wang , Yu Xiao Fen , Xu Cong Yu , Hu Jia Wen
Published: March 2013

Because of the large diameter’s big volume, heavy weight, high thermal capacity and bad measurement environment, the workpiece’s diameter can only be detected in the processing locale. Though the rolling-wheel method can realize the large diameter online measurement, it can not achieve the diameter high precision measurement influenced by rolling-wheel skidding, compression deformation and temperature distribution. Focusing on the above problem, a new multi function rolling-wheel large diameter measurement system is designed. The designed system mainly researches the main error resource’s distinguish and amendment methods, such as the round grating graduator error, rolling-wheel shape error, rolling-wheel compression deformation, skidding of rolling-wheel to measured axis workpiece and its non-uniform temperature etc. The system can obtain the measured axis’s diameter and roundness real time while getting the needed information of error amendment by integrating multi opto-electronic switch, round grating, reference grating, micro-displacement sensor, temperature sensor etc. The system can realize diameter measurement extended uncertainty 5Dμm(D:1m～10m) and roundness measurement extended uncertainty 1.5Dμm.
Study on the Stability of Micro-Area Sheet Resistance at Testing a Large Silicon Wafer when Probes Vacillated
Authors: Liu Xin Fu , Zhu Zhi Hui , Zhang Ru Qing , Zhang Run Li
Published: March 2013

This article briefly elaborated the basic concepts of the probe vacillated at testing a large silicon wafer with square four point probe equipment. The importance of the micro-area’s sheet resistance is discussed and the basic principles of four point probe measurement technology are analyzed. Some factors that affect the measurement accuracy are studied, and interference can be avoided while measuring and analyzing the impact on square four point probe measurement by probe vacillate. The calculation formula of the square micro-area probe measurement is deduced when probes vacillated discretionarily. At last, an experiment was made with a small wafer sample and accurate resistivity was gotten.
Study on Automobile Interior Noise Characteristic
Authors: Zhang Xiao Juan , Liu Yan , Liu Zong Cai , Yang Bing
Published: March 2013

This paper researched on four different types cars, analyzing interior noise at the same speed under different points, the same point different speeds and the same car different speed different points, it is concluded that family car interior noise distribution law; Through analysis noise spectrum curve which can get the main frequency band, that may provide theoretical basis for automotive noise reduction. In addition, this paper gets that medium low-frequency noise(0-2Brk) are the biggest to composition car’s characteristics loudness from research on characteristic loudness curve, and with speed continuously improve characteristic loudness growth is very significant.
Navigating Error Analysis for Acoustic Doppler Velocity Log
Authors: Cao Zhong Yi , Li Huai Liang , Liu Pei Lin , Chen Yong Xin
Published: March 2013

Aiming to obtain higher navigation precision, this paper studied error sources of the acoustic Doppler Velocity Log (DVL) navigation system. Through analyzing the basic navigation equations of DVL, we knew that the acoustic navigating error was related to on-board attitude sensor error, velocity error and installation deviation error (array deviation angle and array eccentricity error). The author also derived the equations of random navigating errors and measure value errors, giving quantitative analysis of navigation error. Simulation shows the velocity error has more influence on the acoustic navigation error than others. The navigating precision can be promoted by increasing DVL precision, choosing high-precision attitude sensor and better installation error calibrating for acoustic array.
Subjective Preference Study on IACC for National Music Hall
Authors: Guo Tian Kui
Published: March 2013

IACC is an important objective acoustics parameter for evaluating hall acoustics. In order to find out subjective preference value or range of IACC for Chinese national music, under Ando’s hall acoustics theory, by keeping other acoustics parameters unchanged, subjective preference test on IACC was completed by paired-comparison method using headphone reproduction. Firstly, depending on measured binaural impulse responses with very low IACC, by adjusting correlation coefficient, five pairs of binaural impulse responses with different and equal-spaced IACC were derived and then convolved with CD musics including solo and tutti played by Chinese national musical instruments, thus auralization binaural signals were produced. The test’s results indicate that when IACC is between 0.15 and 0.41,acoustics for Chinese national music hall is preferable subjectively，accordingly, subjective preference range for IACCE3 is between 0.19 and 0.46.
Evaluating Uncertainty Caused by Mismatch for Equivalent Capacitance Substitution Method
Authors: Li Jin Yuan , Wang Wei Long , Xie Ming , Liu Xiao
Published: March 2013

To evaluate the uncertainty caused by mismatch using Equivalent Capacitance Substitution Method (ECSM) with a T-network of matching resistors for monopole antenna calibration poses a problem. This paper derives the mathematical model of the mismatch factor through network analysis. The model can be used to evaluate the uncertainty component caused by mismatch or to calculate the mismatch correction factor using ECSM with a T-network for monopole antenna calibration. A case study on the application of the model to actual measurements is also included.
The Experimental Study on the Influence of Human Body to Measurement of High Voltage Power Frequency Electric Field
Authors: Mao Kai , Wang Jin Gang , Deng Xu Dong , He Wei , Zhang Zuo Peng
Published: March 2013

Based on the basic theory of electromagnetic field, the Electric Field Distortion (EFD) in power frequency electric field caused by induced current of human body has been analyzed. The enhancement factor of the electric field distortion is introduced to reduce the influences caused by human body in the measurement of high voltage electric fields. The Ansoft Maxwell is used to simulate and calculate the electric field distribution under the influence of the human body to have the value of enhancement factor. In addition, the enhancement factor has been corrected by experiment with the electromagnetic field analyzer EFA300. With the enhancement factor introduced in this paper, the measurement error can be reduced.
The Measurements and Countermeasures of Electromagnetic Compatibility in CNC System
Authors: Xiao Meng , Li Ying Ying
Published: March 2013

Because CNC systems are usually used in industrial sites, their immunity measurements are very important, this paper introduced how to perform the measurement of electrostatic discharge immunity, surge immunity, electrical fast transient burst immunity and voltage dips and short interruptions immunity. According to experience, it is not so easy to pass the measurements, this paper detailed suitable devices or other countermeasures to solve the problems in order to pass the four measurement items mentioned above.
Oil Extraction Rate Determination Technique Based on Dielectric Constant of Palm Fruit
Authors: Pamornnak Burawich , Limsirorattana Somchai , Chongcheawchamnan Mitchai
Published: March 2013

Since oil palm fruit produces highest yields per cultivated area and its product can be used for many consumer products, it will thus significantly impact to the global economics. This paper proposes a simple technique to determine oil extraction rate of palm fruit. Based on the dielectric constant measurement at microwave frequency, oil extraction rate of palm fruit is found to be inversly proportional to dielectric constant of the palm fruit. This leads to a mathematical model for determining OER in palm fruit. Validity of the model capability for determining OER is proven by predicintg OER of several palm fruit samples. The technique can achieves accuracy of 95.63% for OER determination.
Fault Diagnosis of Bearing in Mechanical Drive System Using Wavelet Analysis
Authors: Wang Zeng Qiang , Zhang Hua Jie , Zhang Xu Hui , Cao Xian Gang , Ma Hong Wei
Published: March 2013

Exploring a proper wavelet base function to characterize fault information of mechanical equipment is a big problem when wavelet analysis is applied into the field of fault diagnosis.Improper wavelet base function can dilute fault information, which will cause difficulties in fault diagnosis , based on the principle that the wavelet domain oscillation waveform are similar to the detected signal components, a proper wavelet base function was selected; through wavelet transform on the acceleration signals of the fault bearing, the spectrum chart of fault signals and the frequency characteristics of fault bearing were obtained. The experimental result shows that this method has a great advantage over extracting character signals.
An Intrinsic Safe Design for the Coal Mine Gas Explosion-Proof Monitoring
Authors: Liu Jun Jie , Lu Ming , Wang Qiong
Published: March 2013

The explosion-proof monitoring system of oxygen content usually is used situates in an explosive mine gas explosion monitoring site, the spark and thermal effects in its monitoring circuit are likely to form dangerous explosion source. Based on the intelligent control technology of MCU(msp430) and radio data transmission technique, this mine oxygen content monitoring system was designed according to the highest mining explosion-proof standards, so that its monitoring circuit can meet the intrinsically safe explosion-proof requirements. That is, when the hardware circuit of a explosion-proof monitoring of oxygen content was designed, the factors for limiting the heat source energy with forming the spark and thermal effects must be considered seriously.
Research on Method of State Evaluation and Fault Analysis of Dry-Type Power Transformer Based on Self-Organizing Neural Network
Authors: Yuan Chen Hu , Zhang Mu , Gao Sheng Wei , Wang Wei , Sun Xing Tao
Published: March 2013

Dry-type power transformer was used widely because of its advantages. But unplanned outage effect to construct a strong intelligent power grid because of various stress. Dry-type power transformer’s fault repair time is long and impossible to repair. So it is very important to realize state maintains of dry-type transformer through state monitor and diagnosis. Based on current diagnostic methods, this paper proposed using self-organizing neural network to realize dry-type power transformer the key point temperature parameters of grading evaluation and then to realize the real-time state evaluation and analysis of failure causes. Study results to prolong the dry-type power transformer life and its design production provide theoretical guidance, in order to reduce and avoid dry-type power transformer failure.
A Review of Geometric Error Modeling and Error Detection for CNC Machine Tool
Authors: Han Zhen Yu , Jin Hong Yu , Liu Yu Long , Fu Hong Ya
Published: March 2013

Error compensation can improve the accuracy of machine tools effectively. Among the error sources affecting the accuracy of CNC machine tool, geometric error is always set as a key performance criterion. This paper summarizes several methods of geometric error modeling and reviews the characteristics of different methods. Furthermore, available methods for measuring geometric errors have been reviewed also based on the advanced instruments. This work aims at enhancing the efficiency of error detection and give a perspective for the application of error compensation in the future.
Development of Contour Size Detection System of Driver Airbag
Authors: Wang Xiao Dong , Zhang Hong Zhe , Chen Hui
Published: March 2013

A new detection system has been designed and developed for detecting the contour size of automobile driver airbag. The detection system is mainly composed of a CCD camera, optical system and a computer which can implement image processing and image recognition. This system uses a CCD sensor as its sensitive element, as well as the basic principle of image processing combined with image segmentation and template matching to determine whether the contour size of airbag is qualified. The experimental results show that the system improves the detecting precision, and speed of assembling automobile airbags. It also solves the problems of a heavy workload by manual operations, inaccurate judgments and low efficiency.
Structure Parameter Identification of Articulated Arm Coordinate Measuring Machines Based on the Least Squares Method
Authors: Lu Jian , Gao Guan Bin , Yang Hui Ping
Published: March 2013

The AACMM is a kind of new coordinate measuring instrument based on non-Cartesian system. The errors of structure parameters are the main factors which affect the measuring accuracy, and the structural parameters identification can effectively improve the measuring accuracy of AACMM. The measuring model of an AACMM was established using the D-H method. Then the error model of the AACMM was established with total differential transforming method, from which the Jacobian matrix was obtained. The structure parameters’ errors which need to be identified through singular value decomposition of Jacobian matrix and the decomposition of orthogonal matrix elementary row transform can be determined. Finally, the least squares method was used in identifying the structure parameters’ errors of the AACMM, the results shows that the method proposed in this paper can identify the structure parameters efficiently.
Study of Novel Sound Detection TCM Pulse State Sensing Mode
Authors: Dong Cao , Jun Yi , He Xiao Hua
Published: March 2013

This paper investigates a kind of Chinese Traditional Medicine (TCM) pulse state diagnosis sensor which is based on sound detection. This method has many advantages and is in line with the TCM pulse state multi-attribute characteristics. First the sound measurement method was designed. Then the verification experiment of electret microphone was studied. The experiment results shown some electret microphones are available for low frequency and low energy vibration signal which is similar to TCM pulse state signal measurement. Eventually it comes to the conclusion that this pulse acquisition mode is available method and can effectively reveal the different kinds of pulse signal characteristic differences. Boys and girls TCM pulse state signal were detected separately. It shows that Different gender has different pulse state and the pulse shape is also different.
Design of Long-Distance and High-Accuracy Rail Subgrade Deformation Monitoring System Based on Zigbee Wireless Network
Authors: Gong Chun Hui , Zeng Guo Qiang , Ge Liang Quan , Tan Cheng Jun , Luo Qun , Liu Xi Yao , Chen Ming Fei
Published: March 2013

A design of long-distance and high-accuracy rail subgrade deformation monitoring system based on Zigbee wireless network is proposed according to the requirement of inclination measurement for the Qinghai-Tibet railway rail subgrade. This paper selects Atmega128 as the microprocessor of the system, and uses SCA103T as high accuracy inclination sensor. When the real time inclination data has been collected and analyzed, GPRS network and Beidou satellite system should send the data to remote server, which can exhibit the deformation of rail subgrade after processing and analyzing the data comprehensively. The measurement results show that the short-term stability reaches 0.01°, and long-term stability reaches 0.02°. The final application distance is nearly 378 kilometers.
Hyper-Spectral Remote Sensing Apply on Alteration Mineral Mapping
Authors: Wang Jin Lin , Wang Wei , Zhou Ke Fa , Yan Ji Ning , Liu Hui
Published: March 2013

With the rapid development of modern science and technology, remote sensing geological survey theory based on what is built on the interaction mechanism the physics of electromagnetic radiation and geological body. It is through the multi-wave spectrum (light), more than reality, multi-imaging, multi-polarization, multi-level enhancement processing technical means to collect and analyze remote sensing data in order to get more spectral, space geological information than alteration mapping. Remote sensing geological survey does not require direct contact with the target, but use of visible light, infrared, microwave detection instrument, through photography or scanning mode, the induction of electromagnetic radiation energy, transmission and processing, thereby identifying the surface target from a long-range, high-altitude and even outer space platforms.