bluuebunny/crossref_metadata_2025 huggingface dataset:
Semiconducting Behavior of Organic Polymer Coating during its Degradation in 5‰ Sulfuric Acid Solution
Authors: Chen Gang , Liu Wei Dong , Zhong Qing Dong
Published: December 2011

In this paper, the semiconducting behavior of No.20 carbon steel coated with different polymer coating in 5‰ sulfuric acid solution was studied by utilizing potential-capacitance and Mott-Schottky analysis. It showed that in the same testing condition, the phenol aldehyde resin and epoxy resin showed n-type semiconducting behavior in 5‰ sulfuric acid, whereas for the alkyd resin, it showed p-type semiconducting behavior in 5‰ sulfuric acid solution. It was suggested that the space charge layer of the polymer coating in 5‰ sulfuric acid solution might be asymmetry. It was suggested that at the early stage of immersion, the polymer coating behaved as an insulator, with increasing immersion time, the coating transferred to P-type semiconductor, then to N-type semiconductor.
The Influence of Heat Treatment on Microstructure and Properties of 00Cr15Ni7Mo2Cu2 Supermarteniste Stainless Steel
Authors: Zhou Yong Heng , Zhao Kun Yu , Liu Xin , Ye Dong , Jiang Wen , Yong Qi Long , Su Jie
Published: December 2011

There are lath martensite and a little austenite in the microstructure of samples quenched. The original austenite grain sizes ranges from 7.9μm to 74.1μm, which grows up gradually with the increasing of temperature quenching. So do the martensite acicular bundle. During the process of tempering at different temperatures after quenching at 1050°C, austenite grain size becomes bigger with the temperature increasing, and martensite acicular bundle becomes thinner. The content of austenite ascends to the peak at 650°C then it decreases. The mechanical properties (σb =958.87 MPa, δ=20.44%, HRC=30.9) of the samples are the best, when quenching temperature is 1050°C and tempering temperature is 600°C.
Scttering of SH-Waves by Interface Semicircular Debonded Cylindrical Lining and Linear Cracks Originating at Edge of Lining
Authors: Nan Jing Fu , Qi Hui , Zhao Chun Xiang
Published: December 2011

The Green function and other complex functions were employed to study the problem of scatteing of SH wave by a interface semicircular debonded elastic lining of two-phase mediums and interface linear cracks originating at edge of lining. We divided the whole model into upper elastic half space with the semi-circular canyon and lower elastic half space with semi-circular lining hill.In lower half space. Semicircular debonded elastic lining is constructed by satisfing the continuous condition of displacement and stress on interface when upper half part and lower half part are conjoined,and linear cracks is constructed by using the method of crack incision, upper half part and lower half part are conjoined by method of “conjunction”.In the end some examples and results of dynamic stress intensify factor are given with discussions.
Recrystallization Law of Ti-IF Steel During Annealing Process
Authors: Feng Yan Qing , Gao Zhi Guo , Wang Fu Ming
Published: December 2011

Recrystallization law was investigated at different annealing processes. The results showed that the annealing temperature was a main effect factor on the properties of Ti-IF steel. Nominal recrystallization temperature of the samples was evaluated as 620 °C. Simulated batch annealing was performed by two-stage heating. Determined recrystallization temperature was 660 °C, the recrystallization of samples heated at 660 °C was completed in 68min. For 800 °C, the equiaxial recrystallized grains were obtained. Simulated continuous annealing by rapidly heating to different temperatures, samples were held for 100s and then cooled in air. Recrystallization nucleation was not observed until 660 °C. The occurrence of secondary recrystallization was observed at 900 °C.
Self-Supporting Electrode Based-on SWNT Paper for Supercapacitors
Authors: Xu Xiao , Qian Lu Ming , He Lei , Che Jian Fei
Published: December 2011

Self-supporting film of single-walled carbon nanotubes (SWNTs), also known as SWNT paper, is held together by Van der Waals force without any chemical binders. Prepared by vacuum filtration method, SWNT paper was then decorated wirh polypyrrole (PPy) through pulsed potentio amperometric polymerization. The results indicated that the SWNT paper had a typical network structure, after polymerizing PPy, cauliflower-like structure was observed on the surface of SWNT ropes. The composite thin film has good cyclic voltammetry (CV) property and the specific capacitance wass ca.420Fg-1, which was much larger than that of pure SWNT paper.
Ar Plasma Modified Multiwalled Carbon Nanotubes/NiFe2O4/Polyimide Nanocomposites
Authors: Zhang Lei , Li Jia Jun , Shi Chun Sheng , Liu En Zuo , Zhao Nai Qin
Published: December 2011

The emphasis of this study was surface modification on MWNTs by dielectric barrier discharge plasma at atmospheric pressure. The effects of the plasma treatment on the MWNTs were characterized by SEM, XRD and FT-IR. The results show that surface of carbon nanotubes (CNTs) emerge carboxyl group, and the plasma modified CNTs by a physico chemical adsorption without structural damage. Modified CNTs/ferrite/polyimide nanocomposites, were prepared and mechanical test demonstrate the low temperature plasma treatment is an effective way to improve interfical bonding bewteen CNTs and polyimide (PI) matrix.
Research on the Fiber Breakage Damage in Fiber Reinforced Polymer Laminate
Authors: Zhang Tai Feng , Yang Xiao Hua , Zhang Yong , Li Yan
Published: December 2011

In this paper, the single ply fiber breakage model is established based on the distribution function of fiber static strength, and on this basis, the acting process of fiber breakage in FRP laminate is analyzed in detail. According to the experiment data, a method is devised to identify the parameters of the static strength distribution function. Through the references to the classical laminate theory, a computation model of the laminate stiffness degradation process is developed which takes the fiber breakage damage into consideration. The analysis of the results shows that this model can employ only several parameters to describe very well the laminate stiffness degradation process under different stresses.
Investigation of Phase Composition and Microstructure Characterization of the B4C/BN Composites Fabricated by Hot-Pressing Process
Authors: Jiang Tao
Published: December 2011

The B4C/BN composites were fabricated by hot-pressing process in this research. The B4C/BN composites included the B4C/BN microcomposites and the B4C/BN nanocomposites. The B4C/BN microcomposites were fabricated by hot-pressing process, and the B4C/BN nanocomposites were fabricated by chemical reaction and hot-pressing process. In this research, the phase composition of the B4C/BN microcomposites and the B4C/BN nanocomposites were investigated by XRD analysis. The XRD patterns results showed that there existed the B4C phase and h-BN phase in the hot-pressed composites. The microstructure of the B4C/BN microcomposites and the B4C/BN nanocomposites sintered bulks were investigated by SEM and TEM. The SEM micrographs showed that the B4C/BN microcomposites and the B4C/BN nanocomposites sintered bulks exhibited the homogenous and compact microstructure, and the h-BN particles were homogenously distributed in the B4C matrix. The TEM micrographs showed that there existed the weak interface between the B4C matrix grains and h-BN particles as well as the microcracks within the laminate structured h-BN particles.
Effect of Ultrasonic Field on Centerline Segregation of Cast Aluminum Alloy 7050 Ingots
Authors: Li Xiao Qian , Chen Ding Xin , Jiang Ri Peng
Published: December 2011

By introducing ultrasonic field during the solidification process of aluminum alloy melt, the effects of ultrasonic treatment (UST) on macroscopic and microscopic segregation were investigated. The results show that under 170W of UST, the macrosegregation degree of Zn is diminished to the minimum, the segregation index reaches 0.0583. At a higher ultrasonic intensity, the UST greatly contributes to the positive centerline segregation in the ingot. Compared with conventional casting (without UST), the solid solubility of Zn, Cu and Mg inside crystals of ultrasonic casting can be strengthened so that the microsegregation tends to be minimized. Overall, the ultrasonic cavitation and acoustic stream promote the redistribution of solute elements in the ingots, and a reasonable ultrasonic power is beneficial to weaken the segregation.
Syzygium Samarangense Leaf Mediated Biosynthesis of Gold Nanoparticles and its Application in Catalysis
Authors: Yang Xin , Yang Wen Jin , Weng Lian Jin , Han Yuan Yuan , Geng Di
Published: December 2011

In this study, we report one-pot biological fabrication of gold nanoparticles by a facile procedure using lixivium of Syzygium samarangense leaf without extra surfactant, capping agent, and/or template. The resulting gold nanoparticles showed good performance in the catalytic reduction of 4-nitrophenol.
Effects of Ion Doping at Different Sites on Electrical Properties of Ferroelectric Bi4Ti3O12 Ceramics
Authors: Wu Yun Yi , Wang Lei , Hua Zhi Qiang , Li Tao , Yuan Xue Tao , Lv Xu Dong
Published: December 2011

Pure, La3+doped at A site, V5+doped at B site, and La3+and V5+co-doped ferroelectric Bi4Ti3O12(BTO), Bi3.25La0.75Ti3O12(BLT), Bi4Ti2.98V0.02O3(BTV) and Bi3.25La0.75Ti2.98V0.02O12(BLTV) were successfully prepared by conventional sintering technique. The structures of the ceramics were investigated by X-ray diffraction, Raman spectroscopy, and scanning electron microscopy. X-ray diffraction indicated that assemblages of all sintered ceramics consist of a single phase of Bi4Ti3O12, implying that the A-site La3+and B-site V5+substitutions in this case do not affect the layered structure. Among these ceramics, BLTV ceramic exhibited the best electrical properties. The leakage current density of BLTV ceramic was only 1.3×10-4Acm-2at 40 KVcm-1, two orders of magnitude lower than BTO ceramic. Besides, a saturated ferroelectric hysteresis loops with largest remnant polarization 2Pr of 30.6μC/cm2was observed for this sample. These suggested that the co-doped Bi4Ti3O12ceramic by La3+and V5+at A and B sites showed advantages in application over the pure BTO, doped BLT and BTV ceramic, respectively.
Microwave Absorbing Performance and Infrared Emissivity of Co-Doped ZnO
Authors: Zhang Shu Yuan , Cao Quan Xi
Published: December 2011

In this paper the powders of Zn1-xCoxO (x=0, 0.01, 0.02, 0.025, 0.05, 0.1) were fabricated by the conventional solid state reaction. The crystal structure was characterized by x-ray diffraction (XRD). The electromagnetic parameters were measured using vector network analyzer (VNA), the infrared emissivity in the wavelength range of 3-5μm and 8-14μm was measured by Dual-band infrared emissivity measuring instrument. The absorption bandwidth of the double-layer microwave absorber is obviously more than that of the single-layer absorber. The bandwidth of the double-layer microwave absorber for reflection loss R<-8dB is 2.64GHz over the range of 8.2-18GHz. The thickness of the absorbers is only 4 mm. The infrared emissivity is only 0.39 in the range of 3-5μm and 0.81 in the range of 8-14μm.
Luminescence Properties of Er3+/Tm3+-Doped Ga2O3-Bi2O3-PbO-GeO2 System Glasses
Authors: Liu Jin , Shi Dong Mei , Zhao Ying Gang , Wang Xiao Feng
Published: December 2011

The visible and near infrared emission spectra of Er3+/Tm3+-doped Ga2O3-Bi2O3-PbO-GeO2(GBPG) glasses excited at 808 nm are experimentally investigated. The results reveal that 1.53 µm emission were enhanced with an increase of Er3+concentration. Furthermore, the incorporation of Er3+into Tm3+-doped systems has also resulted in intense 522, 545 and 693nm upconversion emission intensity and an weak 660 nm red emission. The possible mechanism and related discussions on this phenomenon have been presented. The results show that Er3+/Tm3+-codoped GBPG glass may be a promising materials for developing laser and fiber optical devices.
Influence of Al Substitution on Magnetocaloric Effect in La0.8-XAlXCe0.2Fe11.4Si1.6 Compounds
Authors: Hu Yi , Li Shan Dong , Liu Mei Mei , Wu Jian Peng , Cai Xin Le , Qiu Jie , Lin Jian Hua
Published: December 2011

The influence of Al doping on the magnetic properties and magnetic entropy changes (ΔSM) of the La0.8-xAlxCe0.2Fe11.4Si1.6(x = 0-0.2) compounds have been investigated around their Curie temperature TC. The incorporation of Al atoms is unfavorable for the formation of the NaZn13-type phase, however, it increases the TCby ~40 K, effectively decreases the magnetic hysteresis loss, and broadens the ΔSM-T curve at expense of the (ΔSM)maxof the compounds. It is also revealed that Al doping content of x = 0.06 is an important composition knee point where the doped Al start to occupy the site of Rare-earth elements, leading to a turning point for the lattice constant, TC, and magnetic transition type.
Study on Effect of Pressure to Nitrogen Solubility Limit in High Nitrogen Steels
Authors: Wang Shu Huan , Li Chen Xiao , Fang Xin Kuo
Published: December 2011

This paper aims to study the effect of time and pressure on the nitrogen solubility limit through single factor experiment. The experiment is operated in the independent designed device whose main part is high temperature and high pressure reactor, Using high pressure and bottom blowing nitrogen in the furnace, it can gain high nitrogen nickel-free stainless steels whose nitrogen content is more than 1.1%.;The results show that there is solubility limit of nitrogen in 18Mn18CrN steel under certain condition ; The solubility limit of nitrogen in steel increases with the growth of pressure which ranges from 0.4MPa to 1.4MPa.
Ore-Proportioning Optimization Technology in Pellet Process Based on Self-Characteristics of Iron Ores
Authors: Lv Xiao Fang , Han Hong Liang , He Hong Sheng
Published: December 2011

The quality of pellet has a great extent effect on the BF smooth operation. In this paper, Self-characteristics of iron ore powers used in pellet process were investigated. Then, the principles of ore-proportioning optimization basing on self-characteristics of iron ore during pelletizing were proposed. Schemes of ore-proportioning optimization were designed and a series of experiments on the schemes have been made for seeking the rational ore-proportioning scheme. The results show that there are great differences in the pelletizing properties of single iron ore podwer, and the object of improving pellet quality is reached through optimizing ore-proportioning, that lays a theoretical foundation and provides technical basis for improving pellet quality.
Nitrogen Control Technology for the Blowing Process of Combined Blowing Converter
Authors: Chen Jun
Published: December 2011

At present, the nitrogen content in aimed molten steel is 18.32ppm on average in PISCO（Panzhihua Iron & Steel Co.）, and there is big fluctuation for nitrogen content. To solve this problem, factors affected the nitrogen content while blowing is discussed, and a comprehensive nitrogen control technology is formed. Experimental results show that with this technology the nitrogen content in aimed molten steel can be controlled in 15ppm, with the average value is 12.53ppm. The average nitrogen content in aimed molten steel is reduced by 5.79ppm, and nitrogen content of aimed molten steel is well controlled.
Study of Tungsten Smelting Aqua System Heterogeneous Discipline
Authors: Wan Lin Sheng , Sun Li , Chen Ling , Li Hong Chao , Gong Dan Dan
Published: December 2011

It was studied the heterogeneous discipline of tungsten smelting solution system. The consequences showed that the heterogeneous degree of WO42- was greater than that of Clˉ, heterogeneous rate was presented the trend of first increased and then decreased. The heterogeneous phenomenon of density lesser OHˉ ion was not obvious. The heterogeneous degree of WO42-, Clˉ and OHˉwas matched with their ratio of quality to radius, the heterogeneous rate of big viscosity aqua was much slower.
Turbulent Flow of Molten Steel in Thin Slab Continuous Casting Mold
Authors: Liu Zhong Qiu , Qi Feng Sheng , Li Bao Kuan , Jiang Mao Fa
Published: December 2011

The quality of continuously casting steel is greatly influenced by turbulent flow in the mold. Understanding the unsteady flow structures in this process is an important step in avoiding failures and decreasing defects. The cassette filter function is used to deal with unsteady Navier-Stokes equation, and then the turbulent flows in the thin slab continuous casting processes are simulated with the large eddy simulation (LES) method with the Smagorinsky sub-grid scale model. Characteristics of the unsteady turbulent flow in the thin slab continuous casting processes are exhibited. The turbulent asymmetric distribution was revealed even the nozzle in the centre position. And the vortices are located at the low velocity side adjacent to the nozzle.
Physical Simulation on the Liquid Metal Flow in FC-Mold of Slab Continuous Casting
Authors: Zhang Zhen Qiang , Jia Hao , Zhang Xiao Wei , Deng Kang , Ren Zhong Ming , Lei Zuo Sheng
Published: December 2011

The flow state and velocity distribution of liquid metal in the FC-Mold and the influence rules by the magnetic flux density have been investigated when electromagnetic brake adopted, applying mercury as medium to simulate molten steel in the continuous casting process. The velocity measurement has been completed by the Ultrasonic Doppler Velocimeter (UDV) under various magnetic distribution and the influence laws of magnetic flux density on the liquid metal flow in the mold has been analyzed. The experimental results indicate that, when the upper and lower magnetic flux density is 0.18T and 0.5T respectively, a preferable control effect can be obtained, not only the free surface fluctuation can be compressed, but also a plug flow can be rapidly formed.
The Reason for Lose Efficacy of Electromagnetic Clutch Based on Mould Method
Authors: Jiang Shi Bo , Liu Jie , Fang Ting
Published: December 2011

This paper do a detailed analysis to the property and the reason for lose efficacy of electromagnetic clutch of a certain factory, introduce a adjust method —model method, analyses the measuring data, the model method is realistic method by way of practice。
Experimental Study on Decarburization in Heavy Rail Manufacturing Process
Authors: Ding Cui Jiao , Jiang Yang Hu , Liu Zhan Zeng , Song Zhong Hua , Chen Sheng
Published: December 2011

Through the metallurgical testing on a lot of samples from different parts of the heated slab and the finished product in heavy rail manufacturing process, analysis on the surface decarburization characteristics of U71Mn and U75V is carried out. Through analyzing the main affecting factors on the decarburization depth of heavy rail in the heating and rolling process, some effective means to reduce the product surface decarburization are put forward. The results show: (1) The surface decarburization depth distribution of heavy rail slab heated in the regenerative furnace is seriously imbalanced, and the fluctuation ranges between 30% -40%.(2) Under the same production conditions, decarburization of U75V is serious, and the average depth of U75V is more than 11% higher than the U71Mn. (3) The rolling process in the production of heavy rail has a great influence on the distribution of the surface decarburization depth. (4) Because the deformation rate of rectangle slab in the rolling process everywhere is different, in order to reduce the decarburization depth of finished product, it is useful to select the narrow surface of slab to generate the head of heavy rail, as well as to change the structure of the slab cross-section from right-angle to arc.
Mould Parts Design Based on Knowledge Fusion of NX
Authors: Wang Ling Yun , Huang Hong Hui
Published: December 2011

In traditional CAD technology, it is mainly to express the geometric information of parts, but can not express non-geometric information, such as weight, strength, and can not do the design of geometric distortion for changed topology. The combination of knowledge-based engineering (KBE) and CAD solved these problem in the filed of molding. NX/KF is a new technology to integrate CAD and KBE. This paper develops the mould parts with NX/KF as an example to explain its application. It analyzes the substance of parametric design and point out the developing direction of CAD by analyzing new characteristics of knowledge fusion.
Performance Evaluation of Classifiers Applying Directional Features for Devnagri Numeral Recognition
Authors: Singh Pratibha , Verma Ajay , Chaudhari Narendra S.
Published: December 2011

Handwriting recognition is a special category of pattern recognition which is matured enough for English language, but for Hindi it is in development state. Among various features directional features found to outperform than the others. So in this paper, we have evaluated the performance of various direction features and various classifiers for the handwritten Devnagri numeral recognition. The character image is preprocessed and portioned into sub-images. The standard zoning is compared against flexible zoning. An experimental comparison of gradient features and chain code histogram feature is evaluated with Bays classifier, K-nn, fuzzy k-nn. For comparison of the performance, the error rate and complexity of computation and time is used as the measure. Gradient features are found to outperform among various directional features.
Ferroelectric and Pyroelectric Properties of Nano Graded Ferroelectric Films
Authors: Chen Hui , Cheng Tai Min
Published: December 2011

In order to improve the properties of nano graded ferroelectric films (NGFF), the generalized Ginzburg-Landau-Denvonshire (GLD) theory is used to investigate the ferroelectric and pyroelectric properties of NGFF. A function is introduced to describe the local structure of this graded film. The numerical results show that parameter and film thickness are two very important factors that influence the ferroelectric and pyroelectric properties of films, larger values lead to smaller spontaneous polarization and lower pyroelectric peak Local structure in NGFF leads to flatten the polarization distribution, which raises the spontaneous polarization of components with lower transition temperature, but reduces spontaneous polarization of components with higher transition temperature.
An Interesting Difference between Fourier Transform & Laplace Transform
Authors: Singh Gavendra , Gupta Varun , Pundir Shekhar , Sharma Shobhit
Published: December 2011

Many authors have been found the difference between Fourier Transform & Laplace Transform. In this paper we are highlighting the major or you can say interesting difference between Fourier Transform & Laplace Transform . If we look on the step signal , we will found that there will be interesting difference among these two transforms. In this paper we are giving the interesting reason behind this.
An ASIC Design of a High-Speed Clock and Data Recovery Circuit
Authors: Ng Chi Wai , Yu Kai Hung , Sham Chiu Wing , Michael Tse C.K.
Published: December 2011

Clock and Data Recovery (CDR) means that the digital data streams are sent without an accompanying clock signal. A digital CDR circuit is proposed as it does not depend on the special analog process and provide higher immunity to the noise. This design is fabricated using 0.13μm standard process and the circuit can support up to 5 GHz data rate to support the high speed standard. Compared to other CDR design with more advanced technology, our implementation can have similar performance but the manufacturing cost can be reduced.
Enhancing Agent Intelligence with Behavior Duplication
Authors: Tang Wei , Lai Jun
Published: December 2011

The traditional agent intelligence designing always lead to a fixed behavior manner. In this way, the NPC(Non-Player Character) in the game will act in a fixed and expectable way. It has greatly weakened the long-term attraction of single-played game. Extracting the human action patterns using a statistical-based machine learning algorithm can provide an easily-understanding way to implement the agent behavior intelligence. A daemon program records and sample the human player’s input action and related properties of character and virtual environment, and then apply certain statistical-based machine learning algorithm on the sample data. As a result, a human-similar intelligent behavior model was obtained. It can be used to help agent making an action decision. Repeating the learning process can give the agent a variety of intelligent behavior.
The Implementation of Mobile Agent System Based X.509 Certificate
Authors: Xu Da Wei
Published: December 2011

The paper introduces the design objective and design scheme of mobile agent-based X.509 certificate management system, and describes the key technologies such as encryption, the certificate processing format and coding, secure communication protocols such as SSL in detaile.
Surface Defect Detection of Chinese Dates Based on Machine Vision
Authors: Wang Fu Juan , Dong Yong Qiang
Published: December 2011

In order to implement the accuracy and robust of Chinese dates surface defect detection based on machine vision techniques on line, the method of detection for Chinese dates was studied. The Chinese date is segmented from the background in RGB color space by analyzing respectively the histogram of R, G and B channel to make comparing among them and find an optimal one, resulting in good contrast between Chinese date and background in G channel. The brightness of the damaged area edge changed clearly on the whole Chinese dates area according to the gray image of R, G and B channel, especially in G channel. It shows the gray value of the defect area breaking obviously. So the damaged area could be detected by edge detect, through image thinning the defect edge was extracted. Furthermore, the geometry parameters of defect edge were calculated, these parameters could used to distinguish the defect area with the fruit area and the degree of the defect area. Experiments result proved the methods is effective to detect defect area of Chinese date.
The Design and Realization of a Network Test Questions System
Authors: Shao Ren Xiang , Wan Li
Published: December 2011

The article sets up a self-adaptive network test model and introduces a system for the course “Linear Algebra”. The system can present different problems on the basis of tester level and the process of answering question. The system may reduce the amount of test question, shorten the time of the test and estimate more accurately the level of the tester relative to tradition test. The paper has certain direction meaning for tester self-test and computer assistant test.
Measurement of Financial Derivative Instrument’s Fair Value
Authors: Liu Yi Chao
Published: December 2011

More and more people pay attention to the measurement standard of derivative financial instruments. As the derivative financial instruments measurement standard, the fair value has been included in the new enterprise accountant criterion in China. How to determine the faire value? This paper introduces the method and its use of the fair value.
The Econometric Model of Resource Efficiency Based on Emergy Theory
Authors: Zhu Xian Cheng , Zhang Zhi Peng , Qian Kun
Published: December 2011

The paper defined the connotation of resource efficiency, and utilized the emergy theory and language to convert different resources which occured input, output and negative effects in the of regional economic system into the amount of the energy value of unified standards, and also established the econometric model of resource efficiency. The author scientifically explained and empirically analyzed the model utilizing emergy symbols, which provided a new theoretical models and methods for measuring resource efficiency.
4G Mobile Communication Network System Security Faced with Threat Question Research
Authors: Wu Xin Min , Wu Hao Shu
Published: December 2011

This article first has carried on the brief elaboration to the 4G mobile communication system's network architecture and the key technologies, will face more and more threats facing future 4G mobile communication network security, has analyzed the communication network, the 4G network safety mechanism and 4G the correspondence development faced with the security threat question, next will adopt the mobile communication network security the protection technology, finally proposed in the future must study question and development direction.
Spaceborne SAR Signal Processing Algorithm Considering the Coherence
Authors: Qiu Zhi Wei , Li Yan
Published: December 2011

In the introduction to this dissertation, one flowing algorithm is proposed in this paper considering the SAR Interferometry. The basic idea of this algorithm is that we can adopt the same imaging parameters, such as the doppler centroid, etc. when converting the two raw data from signal information to images for Interferometry. ERS-1/2 Tandem 0 level data in Zhangbei have been tested in this artic, the better phase fringes could be acquired compared with standard 1 level SLC data provided by ESA process station. The experimental result indicates the proposed method is highly desirable for research and application for InSAR technology.
The Fault Detection Strategies Used in Mobile Communication Network
Authors: Luo Hong Wei , Wang Huai Bin , Li Jin Feng
Published: December 2011

With the rapid development of information technology, the use of mobile communication tools to infiltrate every aspect of daily life and people is increasingly demanding for the quality of mobile communication network service. As the user base is increasing, mobile communications networks is also increasing pressure. In the traditional artificial methods about communication network fault detection, network managers need to do a lot of work and the process is tedious but not satisfied with the quality test. It is an effective means of fault management using software to manage the network. The mobile network fault detection system base on data mining not only reduces the workload of network managers and the test results more accurate, but also can reduce network management costs. In this paper, we introduce the fault detection strategies for the mobile communication network. By using the data mining algorithm, we can find the network default more easily.
FPGA Implementation of an Error Detection and Correction Algorithm in Mode S-Based ADS-B System
Authors: Zhou Jian Hong , Zhang Chao , Liu Xiao Bin
Published: December 2011

“ADS-B Messages” transmitted on 1090MHz are the Mode S Extended Squitters. When a Mode A/C fruit interferes with a mode S Extended Squitter, some of ADS-B signals may be received in error. These errors need to be corrected by some correction methods. To solve this problem, an error detection and correction algorithm using cyclic redundancy check (CRC) based on bit and confidence declaration is proposed in this paper. Then, the proposed algorithm using the Verilog hardware description language is verified by MODELSIM joint ISE simulation and realized on Field Programmable Gate Array (FPGA) based on ADS-B system. The results show that the algorithm can effective detect and correct data transmission error, which effective advances the reliability of the signal transmission for ADS-B system.
Benchmarks Comparing for IEEE 802.15.4 with Hidden Terminals
Authors: Wu Zhen Hua , Huang Xiao Chuan , Shu Jian
Published: December 2011

Hidden terminal problem (HTP) has been a main research aspect in the field of wireless network performance analyzing and testing since it was formulated in 1970s. This article conducts a relatively comprehensive testing on the performance degradation of IEEE 802.15.4 network, which is beacon enabled, star architecture and using slotted CSMA/CA algorithm, due to HTP. All simulate experiments are conducted in NS-2. The experiment results show that: data generation form has little impact on HTP; packet length has more effect on HTP than the number of packets; HTP is trivial when network load is lower than 10%; acknowledge mechanism enlarges extremely HTP; increasing the value of beacon order (BO) is help for alleviating HTP when BO value is small than 6. These conclusions are useful for understanding the features of HTP in IEEE 802.15.4 networks.
A Studying on Implementation of NIDS Pattern Matching Based on FPGA
Authors: Li Jing Jiao , Cholman Ho , Chen Yong , Pak Song Ho
Published: December 2011

Intrusion detection for network security is an application area demanding high throughput. The pattern matching in intrusion detection requires extremely high performance to process string matching. Most of pattern matching using software has many time complexities and cannot reach the requirements of high throughput. The pattern matching using hardware considerably improves the speed of matching and has several other advantages. This paper describes a FPGA-based pattern matching architecture, using hashing method called XOR Hashing. The proposed method updates new patterns without reconfiguration and processes the collision and has high matching performance. The proposed system implements the pattern matching by using Snort rule-set, an open source Network Intrusion Detection and has simulation processing on PC. Compared with existing hardware method, the results explained that our method has relatively high performance for the pattern matching and can else process the pattern matching with high performance on low–cost FPGA device.
SVM Model for Prediction and Classification of Drosophila Based on Nucleotide Composition
Authors: Singh Ananjay , Joshi Kireet , Pant Bhasker
Published: December 2011

MicroRNAs (miRNA) are single-stranded RNA molecules of about 21–23 nucleotides in length. MicroRNAs(miRNAs) constitute a large family of non coding RNAs that function to regulate gene expression. Till today wet lab experiments have been used to classify the miRNA of plants and animals. The wet lab techniques are highly expensive, labour intensive and time consuming. Thus there arises a need for computational approach for classification of plants and animal miRNA. These computational approaches are fast and economical as compared to wet lab techniques. In this paper an attempt has been made for the classification of Drosophila and its subclasses.The overall prediction accuracy of SVM modules based on mono nucleotide composition was 83.12% respectively. The accuracy of all the modules was evaluated using a 10-fold cross-validation technique.
The Integration of RFID Information System Programs Based on Grey Multi-Attribute Decision Making Analysis– Taking Chemotherapy Infusion Dispensing Procedures for Example
Authors: Lin Wen Tsann , Wang Shen Tsu , Li Meng Hua
Published: December 2011

This study intended to investigate the effect of integrating RFID information systems into cancer chemotherapy infusion dispensing procedures on the efficiency of patient care. After the ad hoc committee selected the improvement program based on grey multi-attribute decision-making, improvements were made to the information system and infusion dispensing procedures, and relevant professionals fully communicated with one another to apply the RFID information system to the improvement program. After the RFID information system was integrated with the infusion dispensing procedures, the average total operating time for dispensing chemotherapy infusions was reduced from 24.55 minutes to 12.2 minutes, which was a decrease of 50.3%. The objective of requiring less time than the standard (16 minutes) was achieved, verifying that the integration of better RFID information system programs indeed can reduce the time required for providing patients with service. The improvement program can both increase operating efficiency and patient safety, and can be provided as a reference to relevant industries.
Constructiaon of Management System on the Enterprise Information Security
Authors: Liu Qiao Rong , Kang Xiao Juan
Published: December 2011

The information resources and information system has become important assets that the enterprise depends on in survival and development, Otherwise the information security problem has become more and more serious. Enterprise information security is not only technical problems, more important is management issues.It is ensure in Information security protracted and stability Only when effectively safety management are implemented in safe construction organization settings, policy and employee training, etc.
The Index Evaluation System and Model Building for Sustainable Development of Coal Industry
Authors: Kong Liuan , Wang Xiao Mei
Published: December 2011

It is not optimistic for the coal resource and its exploration, since the maintenance of coal resource is shrinking and the constraint for the development of economic society is becoming more and more obvious. It is very necessary to carry out the research on sustainable development of the coal industry. This article puts forward an index evaluation system for sustainable development of coal industry composed by three levels and 24 indexes, builds an evaluation model for it and comprehensively evaluates the level of sustainable development of the coal industry in Henan based on it.
Research and Implementation of Experimental Platform for Network Attack and Defence Based on Honeynet
Authors: Zhang Ting , Guo Lin Hong
Published: December 2011

The key problem of the network and information security is protect the computer system and network effectively. An open virtual experiment platform of the network attack and defence, which simulates network enviroment, is builded by virtue of Honeypot and Honeynet. The entire network is virtually contained on a single, physical, system.
The Comparison and Selection of Cast-In-Situ Schemes of Beijing-Shanghai Express Railway Continuous Box Beams in Tianjin Grand Bridge
Authors: Duan Chen Xue , Zheng Yong Lai , Wang Li Jun
Published: December 2011

This paper mainly deals with the comparison and selection of several Cast-In-Situ schemes of the continuous box beams in Tianjin Grand Bridge Spanning University Road, which is part of Beijing-Shanghai Express Railway, and puts the emphasis on the construction methods and characteristics of rhombic hanging baskets, Beam-Column supports and full-space supports.
Study of the NC Machine’s Connection and Assembly Management System Based on RFID Technology
Authors: Wang Xiu Qing , Song Lei , Na Zhao , Zhang Xian
Published: December 2011

This article takes the management system of NC machine’s connection and assembly as a research object, and introduce RFID technology as well as the application of RFID. It establishes basic information management of NC machine, marking information management, assembly information management, serial communication and other functional modules. Then design engineering framework-a kind of visual management user interface- in VC platform. At last, it needs to do the mapping coefficient and data transmitting from the engineering framework to database by ADO database access.
A Flexible Role Based Access Control Engine Model
Authors: Wang Zhen Wu
Published: December 2011

The normal role-based access control (RBAC) model decouples users and permissions through roles,and different software systems have different implementation syteles.The paper proposes an engine model which can configure the RBAC management systems flexibly.It is a configuration tool to generate different RBAC management systems which meet different users’ requirements. The practice proves that the engine model can improve the efficiency and quality of software development. The role-based access control model decouples users and permissions through roles in order to simplify authorized operations and safety management[1]. Many literatures[2-6] discuss the RBAC model from different aspects. Some literatures[2-3] add new elements to the normal RBAC model,and these models are unidimensional according to the manipulated resources.For example, the NIST RBAC reference model [2] extends and standardize the RBAC96 [1] model reasonably.Some literatures[4-5] introduce time property to RBAC model and they are two-dimensional models according to the manipulated resources.Literature[6] furtherly add visual data muster to RBAC model and proposes a three-dimensional access control model. All of these models only discuss access control model theoretically,and different role-based access control modules in software systems have different instantiation sytles.For example, a RBAC module in one software system can not meet the access control requirements in another system because different RBAC modules have different table fields in order to realize certain requirements. This paper proposes a flexible role-based access control engine which can configure the RBAC module for different systmes according to each customer’s requirement.The engine is a configuration tool and it can realize various RBAC modules which have different table fields in database.The paper is organized as follows.Section I introduces the basic concepts of the NIST RBAC model;Seciton II details the description of RBAC engine model and gives the configuration steps using this engine to generate RBAC instances,and at last section III gives an example and concludes the paper.
The Lead-Lag Relationship of Housing Price between New and Existing Market Based on Cross-Spectral Analysis：A Case of Wuhan
Authors: Li Jin Tao , Sun Jun , Li Hong Bo
Published: December 2011

The purpose of this paper is to explore the lead-lag relationship of housing prices between new and existing market by using the housing price data of eight districts in Wuhan over the period 2001Q1 to 2010Q2. The HP filter and cross-spectral analysis were employed. The empirical study shows that the housing price in the new housing transaction-oriented market structure, the price cycles of new housing are shorter than that of existing housing, and the new housing prices fluctuate frequently. The relationship of housing prices between new and existing market is strong, and the new housing prices are leading or synchronous with the existing market, not consistent with the conclusion that the stock is leading the flow.
A Method of Data Security Integration on Campus Network
Authors: Wang Hai Tao , Chang Chun Qin , Zhao Qian
Published: December 2011

With the development of high education, the campus network, on the one hand, offers us a convenient means of learning and living, while, on the other hand, some problem emerges on the course of using, such as not coupling, consistency, timing, relative data redundancy between the departments. This article, by researching on the framework of campus network and Cluster knowledge, presents a security and data integration method of campus network design and plan. By this approach, the effective and overall integration, secure information exchange is complemented between departments of campus network.
A Unified Utility Framwork for Applications in Heterogeneous Wireless Environment
Authors: Li Yu Hong , Shi Yan , Yu Liang , Zhang Bo Fan
Published: December 2011

The paper studies the adaptable capability of applications in mobile networks in the context of the optimizing the network resource usage. Based on a thorough analysis of applications’ adaptability, a unified utility framework is proposed to describe the resource requirement of applications and their adaptability. Utility functions of different type of applications are discussed under the utility framework. Examples for how to use the framework are also given. Simulation results show that the proposed utility framework can be used for optimizing network resources and can therefore satisfy the needs of more applications.
Measurement of Structure’s Image Primitive Based on Power-Law
Authors: Zeng Zhen , He Tao , Fan You Qing , Liang Heng
Published: December 2011

In industrial machine vision (MV) applications, it is a popular research direction to identify a structure mechanical part image primitive’s relationship with its background by extracting actual contour from a captured image. However, numerous nonlinear problems turn up in MV applications of measuring and inspecting mechanical parts. Those problems are brought by components of MV system including lens, cameras, lighting effect, and sheltered measured object. These nonlinear phenomena usually result in incomplete and inconsistent geometrical shape of a structure’s image primitive. Therefore, special primitive measurement theory and method are researched in the thesis, on the basis of analyzing fractal and structural features of mechanical parts. The method found that an important trait of mechanical parts image contour which can be used to reduce the impact of nonlinear phenomena and determine a closest contour of the image primitive by using different multi-scale rulers in measuring. The effect of the measurement method is proved by an example in cylindrical connectors’ inspection.
Performance Analysis of Frequency Hopping Communication System Synchronization
Authors: Zheng Jian , Wei Xin Yu , Ni Xiao Gang
Published: December 2011

This paper studies a method based on synchronized prefix improved method, use a synchronous frequency method related to the system time (TOD) to generate the synchronization frequency, each synchronous frequency changes over time in constantly changing, thus protecting synchronous frequency, and sent low frequency TOD Is calculated out of the high TOD, which increases the difficulty of deciphering. the results of Performance Analysis show that TOD self-synchronizing synchronizing time is quick, the synchronized probability is big, good randomness, has met the project design anticipated requirements.
SCR System Control Based on ADX
Authors: Xin Zhe , Wang Shun Xi , Zhang Yun Long , Liu Jia Xin , Bo Wei , Yun Feng
Published: December 2011

With the increasingly stringent emission control regulations, selective catalytic reduction (SCR) technology is considered to be the most promising method in removal NOx from diesel exhaust. In this paper, the method based on model development was adopted to conduct the overall program design of hardware and software of SCR control system. The real-time simulation was constructed based on the AD5435 control system hardware rapid prototyping, and the model of the system software was built based on Matlab / Simulink. Real-time monitoring interface was designed to monitor and calibrate the parameters. CAN bus was used to realize the information interaction and SCR system control.
Research on the Civil Building Energy Efficiency Trading Mechanism
Authors: Xiao Shu Ying , Zhang Zhi Gang , Zhang Wei , Wang Shuai
Published: December 2011

Building energy saving is one of the most important areas in energy saving and emission reduction, but it needs more funds and technology to achieve the target of building energy saving. Lesson from some abroad experiences on Carbon emission trading, this paper analyzes the limitation of the application of CDM (Clean Development Mechanism) in the field of domestic building energy saving, on which an idea to set up a system of domestic civil building energy efficiency trading is presented. The feasibility on the establishment of the system is discussed detailedly.
Research and Optimization on Slot Profile of Multi Stage and Double-Action Roller Rotary Pump
Authors: Lian Jia Di , Zhang Sheng Chang , Deng Hong Ying , Ke Yu Long , Chen Xi Dong , Zhang Yu Lin
Published: December 2011

Through force analysis of running roller for multi stage and double-action roller rotary pump, the force equilibrium equation about roller was established and the calculation formula of rotor slot profile was deduced for the first time. Using an actual design example, in accordance with the principle of sliding friction force to be a minimum, a optimal rotor slot angel was determined which can eliminate the dead volume, improve force condition of roller, and direct the direction for the future rotor slot profile optimization.