bluuebunny/crossref_metadata_2025 huggingface dataset:
Foundation Pit Excavation on Surrounding Buildings Effect Analysis
Authors: Zhang Qing , Cheng He Ming , Gui Yue , Cao Jing
Published: March 2013

In order to analyze the effect of foundation pit excavation on surrounding buildings, this paper researched the ground surface deformation surrounding excavation engineering, analyzed the buildings additional internal forces change mechanism and the coordination of the building foundation and the ground; The damage were researched on foundation subsidence, ground tilt, surface curvature, torsion and other factors on surrounding buildings and affiliated facilities after excavation. Established an interaction theory model of the buildings foundation and ground, used the model could calculate the changes of internal force and deformation of surrounding buildings caused by foundation pit excavation by selecting the reasonable foundation settlement equation or using the measured settlement data. So this paper provided a theoretical calculation method to engineers to calculate the effect of excavation engineering on surrounding buildings.
Experimental Estimation of Shear Wave Velocity Profile Using MASW Method and Inversion Technique
Authors: Tsai Pei Hsun , Lou Chih Chun
Published: March 2013

In the paper the shear wave velocity profile is studied using the MASW test. The experimental dispersion curves were obtained from the signal process proposed by Ryden. Theoretical dispersion curve can be constructed by thin layer stiffness matrix method. A real-parameter genetic algorithm is required to minimize the error between the theoretical and experimental dispersion curves. To reduce the error of experimental and theoretical dispersion curve using real-parameter genetic algorithm is feasible. The results show that the soil layers of the study area can be modeled as a sandy fill overlaid on an underlying half space. Test results also show that the asymptotes at high frequencies of the fundamental mode approach the phase velocities for the fill of 190 m/s. The depths of weathered bedrock estimating from dispersion curves match well with that of borehole data.
Multidisplinary Optimization of Crank-Link Mechanism of HCPE Based on iSIGHT
Authors: Liu Ying , Zhang Hong Xin , Yin Kai
Published: March 2013

The technology of multidisciplinary design optimization was elaborated, and the structure principle and dynamic model of HCPE were briefly presented. Based on the minimum volume, the collaborative optimization model of crank-link mechanism was constructed. The approximate response surface models of connecting rod and crankshaft were established by means of ANSYS calculation. By combined with iSIGHT software, the collaborative optimization system was realized, and the calculation speed was improved. The optimized volume decreased by 0.803% under the premise that couldn't change the crankshaft counterbalance. So the mass of the engine is reduced and the performance is improved.
Effects of Substituting Ni with Mn on Structure and Hydrogen Storage Characteristics of as-Spun Mg2Ni-Type Alloys
Authors: Zhang Yang Huan , Xu Chao , Zhao Cheng , Wang Hai Tao , Yang Tai , Zhao Dong Liang
Published: March 2013

A partial substitution of Ni by Mn has been implemented in order to improve the hydriding and dehydriding kinetics of the Mg2Ni-type alloys. The nanocrystalline and amorphous Mg2Ni-type Mg20Ni10-xMnx (x = 0, 1, 2, 3, 4) alloys were synthesized by the melt-spinning technique. The structures of the as-cast and spun alloys were studied by x-ray diffraction (XRD), scanning electron microscope (SEM) and high resolution transmission electron microscope (HRTEM). The hydrogen absorption and desorption kinetics of the alloys were measured by using an automatically controlled Sieverts apparatus. The results show that the as-spun Mn-free alloy holds typical nanocrystalline structure, whereas the as-spun containing Mn alloys display a nanocrystalline and amorphous structure, confirming that the substitution of Mn for Ni facilitates the glass forming of the Mg2Ni-type alloy. The hydrogen absorption capacity of the alloys first increases and then decreases with the rising of Mn content, but the hydrogen desorption capacity of the alloys grows with the increasing of Mn content.
Supercontinuum Generation in Nonperiodic Photonic Crystal Fibers and its Application in Frequency Metrology
Authors: Ling Wei Jun , Li Ke , Zuo Ying Yan
Published: March 2013

We generated supercontinuum by utilizing photonic crystal fibers with randomly distributed air holes in the cladding and successfully applied it to optical frequency metrology. Ultra-broad spectra covering a range from the UV to the near infrared were obtained by launching 80 fs Ti: sapphire laser pulses into nonperiodic photonic crystal fibers. In the meanwhile, the experimental results revealed that the distribution of the output spectrum depended on the polarization state of the seeding pulses. Besides, taking advantage of this supercontinuum, we also acquired the clear beat signals by using a new scheme in optical frequency metrology.
Analysis on Displacement Performance Affected by Machining Errors of Single-Notch Right Circular Flexure Hinge
Authors: Shen Jian Ying
Published: March 2013

The output displacement error of the single-notch right circular flexure hinge caused by the machining errors is studied. Firstly, two kinds of factors of machining error in single-notch right circular flexure hinge is put forward, namely, the dimensional deviation of three basic parameters of flexure hinge and the angular deviation of the central line of notch-part circular arc. Then, the relationship between the factors of machining error and the output displacement of flexure hinge is analyzed using FEM software ANSYS. The analytic results demonstrate that the minimum thickness and the cutting radius of flexure hinge have strong influence on the output displacement while the results show the angular deviation of the central line of notch-part circular arc around the -axis has almost no influence on the output displacement. The analytical result has an important significance to design flexure hinge.
Channel Formation in Modified Friction Stir Channeling
Authors: Rashidi Arash , Mostafapour Amir , Rezazadeh Vahid , Salahi Salar
Published: March 2013

Modified friction stir channeling (MFSC) is a new approach for fabrication of a continuous, integral channel in monolithic Al plate, which is carried out in a single pass. This technique is derived from Friction Stir Processing (FSP). Tool profile and position of tool pin against work piece were designed differently from conventional Friction Stir Channeling (FSC) process. In MFSC, Fabricated channel with more regular shape than FSC process shows that the channel formation mechanism is different from FSC. So, in this study, in order to understand the formation of channel, material flow in MFSC is investigated using weakened tool pin technique. Moreover, one of the most important channel properties is width of channel. This characteristic affected the channel area and shape of the channel. Width of channel was unknown in FSC process. But in MFSC, a new region is investigated which determines the channel width.
Use of Nanofluids for Enhanced Natural Cooling of Discretely Heated Enclosures
Authors: Ben-Mansour Rached , Habib Mohammed A.
Published: March 2013

Natural convection heat transfer from discrete heat sources to nanofluids is of great importance because of its application in the cooling of electronic components. The presence of the nanoparticles in the fluids increases appreciably the effective thermal conductivity of the fluid and consequently enhances the heat transfer characteristics. The present study is aimed to investigate numerically the natural convection heat transfer from discrete heat sources to nanofluids. The behavior of nanofluids was investigated numerically inside a heated cavity to gain insight into convective recirculation and flow processes induced by a nanofluid. A computational model was developed to analyze heat transfer performance of nanofluids inside a cavity taking into account the solid particle dispersion. The model was validated through the comparison with available experimental data. The results showed good agreement. The influence of the solid volume fraction on the flow pattern and heat transfer inside the cavity was investigated. The results show that the intensity of the streamlines increases with the volume fraction. It is also indicated that higher velocities along the centerline of the enclosure are achieved as the volume of nanoparticles increases. The influence of the loading factor is more distinguished at the upper heaters and in particular at the highest heater. The heat transfer increases as the volume fraction of the nanoparticles increases from 2 to 10%.
Traction Motor Base Multi-Condition Finite Element Strength Analysis
Authors: Xiang Hui Yu , Li Zhe , Leng Chong Jie
Published: March 2013

Motor base is an important component of the traction motor, it is not only the base to install other components of the motor , but also the magnetizer that contact different magnetic poles. In order to ensure its operation performance, the motor base need good rigidity performance. This paper utilizes the finite element technique, analyzing the frame in the strength under four different conditions. The results show that, in the utmost stress condition, the stress is lower than the allowable value, and the frame has a certain degree of safety, the structural parameter of the base meets the requirement of material strength.
Experimental Study on Leaf-Stripping Mechanism of Separating Machinery for Corn Stalk Skin Flesh Leaf
Authors: Yu Ke Qiang
Published: March 2013

For deciding the structure and parameters of Skin flesh leaf separation machinery of Stems and leaves separation mechanism of corn stalk,the Skin flesh leaf separation machinery key mechanism—leaf-stripping mechanism was experimented in the paper by Self-designed leaf-stripping equipment. For optimization parameters in structure and motion of leaf-stripping mechanism,the experimental method of the three-factor quadratics rotary orthogonal combination was adopted, and two evaluation indexes were applied in the experiment. By carrying on the experiments, the suitable parameters in structure and motion were obtained as below, rotation speed of leaf-stripping roll was 921～1224rpm. leaf-stripping teeth plate clearance was 36.8～41.5mm. and moisture content of corn stalk was 44.9％~65％ .
Study of Wear Phenomena of Coatings for Die-Casting
Authors: Gautier G. , Faga M. , Tebaldo V. , Martra G. , Cartasegna F.
Published: March 2013

During high pressure die casting process, molten metal (aluminum) is injected with a die casting machine under considerable pressure into a steel mold or die to form products. Usually, during the process, the components can undergo several damages such as hot and abrasive wear, metal corrosion and plastic deformation. In order to increase the die life, a surface modification through the application of a Physical Vapour Deposition (PVD) coating can be done. This paper deals with the wear behaviour of a nanocomposite coating (AlSiTiN) deposited onto hot-working tool steel and onto a ion nitrided hot-working tool steel. The characterization includes: nanoindentation test, adhesion test, wear testing at high temperature and optical profilometry. Results showed that the nitriding step had a beneficial effect in terms of hardness, while adhesion between the coating and the substrate was reduced . The film exhibited good wear resistance, with adhesion phenomena as main mechanism.
Implementation and Motion Planning of a Dual Arm Service Robot
Authors: Tan Hong Bing , Cao Qi Xin , Leng Chun Tao
Published: March 2013

This paper describes a dual arm service robotfor restaurant and homeservices. As for the mechanical architecture, we designed an Omni-directional chassis with four wheel-drivensubsystems which are independently suspended so that the robot can move stably and flexibly.Two 6-DOF component-based arms are designed and attached on the robot to fetching objects. A target-guide approach is utilized for path planning to complete object fetching and reception and introducing tasks. We have accomplished the implementation of the dual arm service robot and we have host a robot show with it on the 2010 shanghai EXPO. This robot is warmly welcomed by the visitors and highly praised.
A High By-Pass Ratio Turbofan Model Based on CMF Method
Authors: Wang Bin , Wang Xi , Liu Yue
Published: March 2013

In this paper, a detailed research about a high by-pass ratio turbofan engine transient performance model has been carried out, and the relevant solver equations have been deduced by employing constant mass flow (CMF) method. A high by-pass ratio turbofan engine transient model was established by means of employing the solver equations and Matlab programming language. On the basis of comparison, the calculation results of the model have quite remarkable consistency with those results calculated by GSP 11, with maximum error within 3.0%.The simulation results show that the solver equations of aero-engine deduced in this paper are of high validity and applicability.
Three-Dimensional Computation Design of a Novel Sediment Sampler
Authors: Cao Zhi Jing , He Xiu Bin
Published: March 2013

This paper presents the three-dimensional computation design of a novel hydrocyclone using for in-situ sampling large quantities of suspended sediments. Fluid medium was simulated as the water flow through the Three Gorges Reservoir in the Yangtze River, China and particle flow described by the stochastic Lagrangian model. Both the particle tracking and flow field in the sediment sampler were analyzed to evaluate its performance efficiency. The results of three-dimension numerical modeling have shown that the newly designed sediment sampler can effectively separate micron-sized particles (63µm) from the water and realize separation efficiency of 85% or greater, which have been also proved by the laboratory simulation experiments. Furthermore, results reveal that the model is validated by the good agreement between the measured and predicted results. This paper suggested that the newly designed sediment sampler could be a desirable and low-costing alternative to a centrifuge or filtering separation system.
A Method to Identify Bird Constitutive Model and its Parameters
Authors: Zhang Yong Kang , Li Yu Long , Zhang Hong Bing
Published: March 2013

Identification of a bird constitutive model and its parameters is a very difficult work in bird-impact coupling solution. In order to identify the constitutive model and the parameters simultaneously, an inversion analytic model for the bird material parameters is given based on penalty function method and nonlinear optimization principle, and then combining the model preferential criterion proposed in this paper, the identification system of the bird constitutive model is established with ANSYS Parametric Design Language (APDL). Finally, the feasibility and practicability of this identification method are verified by an example.
Research and Development of Quality Traceability System Based on Intelligent Services for Bee Products
Authors: Kong Ya Guang , Hu Xiao Fei , Chen Tian Jun , You Zhao Tong
Published: March 2013

In order to solve the current bee products quality and safety issues, this paper presents the quality traceability system for bee products based on intelligent business. This system uses state-of-the-art technologies, such as ASP.NET, CDMA, GPS, XML, data collection and barcode technology. Distinctive apiculture log as an information carrier plays a key role in the system. It saves the collection data from Android terminal and is uploaded to Access database server. The web client displays the analysis results for enterprise management personnel to view and feedback. To achieve quality traceability, its’ function reflects in the history search for raw materials source, beekeepers breeding technology help and bee products quality feedback.
Reliability of Duffing-van der Pol Oscillator with Delayed Feedback Control under Wide-Band Noise Excitation
Authors: Zhang Ting , Feng Chang Shui , Wang Qiao Yi
Published: March 2013

The first passage type reliability of Duffing-van der Pol oscillator with time-delayed feedback control under wide-band noise excitations is studied. First, the time-delayed feedback control force is expressed approximately in terms of the system state variables without time delay. Then, the averaged Itô stochastic differential equations for the system are derived by using the stochastic averaging method, from which a backward Kolmogorov equation governing the conditional reliability function and a Pontryagin equation governing the conditional mean of the first passage time are established. Finally, the conditional reliability function and the conditional mean of first passage time are obtained by solving these equations together with suitable initial condition and boundary conditions. The effect of time delay in feedback control force on the reliability is analyzed. The theoretical results are well verified through digital simulation.
Sensorless Vector Control System Design of Permanent Magnet Synchronous Motor
Authors: Liu Zong Liang , Ao Hui Bin
Published: March 2013

In order to achieve closed-loop control，it is generally required to know the position and speed of the motor rotor through installed photoelectric encoder, rotary transformer and some other mechanical sensors on the rotor shaft . But these sensors increase the system cost and the interface circuits between the motor and the control system, and reduce the control accuracy and reliability of the system.This article designs a sensorless vector control system for permanent magnet synchronous motor, and introduces the hardware structure and the working principle of the system, and designs control circuit and vector control software based on IRMCF341 chip. The result of test shows that the system has a steady state performance and a high control precision. The motor runs well without the position sensor and at the same time achieves a much higher level of control performance.
An Automatic Plant Irrigation System Based on Fuzzy Control
Authors: Ge Zhen Yang , Zhang Rui Qing , Yu Ying Jie , Wu Wang Wang
Published: March 2013

An automatic watering controller with AT89S52 single-chip microcomputer was developed. According to the moisture condition detected by soil moisture sensor, the system could control the watering quantity by using fuzzy control rules to limit opening and closing time of electromagnetic valve of the irrigation system. Mamdani inference algorithm was employed as fuzzy control model for this closed-loop control system. Soil moisture sensor was put into the substrate for roots growth to obtain moisture information and used as the input. By comparing the water needed for plant growth, water demand and the electromagnetic valve opening and closing time was determined by the single-chip microcomputer program. Centroid method of defuzzification was used to determine the quantitative level of watering quantity. This fuzzy controller was designed by MATLAB fuzzy logic toolbox. The control system was simulated by Simulink. Simulation results show that this control method has good stability.
Model Reference Adaption Identification Control Research Based on the Asynchronous Motor Vector Control System Model
Authors: Zhao Jian Peng , Wei Rong , Chang Qian Kun
Published: March 2013

Using the easily measured stator current and voltage information of asynchronous motor to get Motor speed by the Model reference adaptive algorithm. MRAS simulation model is builded with the PSIM, thus for system control. Through simulation and experiment in the different frequency and speed condition, contrasted the given speed, actual speed, estimation speed, it shows that the method has good speed identification precision and dynamic performance.
Study of a Fuzzy Decision Making Based Energy-Saving Controller for Marine Power System
Authors: Wu Zhi Liang , Yao Yu Bin , Wang Dan
Published: March 2013

In order to realize energy-saving for marine power system, combining the fuzzy set theory with the traditional PID control technology, the marine power system energy-saving controller was designed, which control ship power grid frequency and voltage collaborative reduction within a certain scope and scale. As several prototypes testing, the application of the energy-saving controller, which control the ship power grid frequency from 60Hz dropping to 57Hz, and the voltage from 450V collaborative falling to 425.5V, and meet the Ship Building Standard, can save 9.85% of electric energy and 9.53% of fuel.
Research and Development of Solar Home Inverter Power
Authors: Su Jian Huan , Zhang Yin Jun
Published: March 2013

At present, in Northwest China, due to sparsely populated, there are a considerable part of the nomads, but in the northwest region of sunshine a long time, solar energy is not very extensive, and for night life, is certainly more boring and boring Therefore, the system just to meet the need.
Modeling and Simulation of Swarm Behaviors in Shoal of Fish
Authors: Shen Yi Ru , Wang Qi Wei
Published: March 2013

Based on the swarm behaviors in shoal of fish, this paper analyzes motion behavior of fish school when fish are foraging. This paper has simulated the pattern of motion behaviors for the fish school quantificationally. Using iterative and updating algorithm, it has modeled the 1-D procedure when fish school gradually approach food. These individual fish that constitute shoal of fish have finite perception and obey simple behavior rules. This paper further adopts modified intelligent optimization algorithm to model the process that individual fish interact with each other, changing position and velocity to gradually be close to food for the 2-D case. Experiment result shows the modified model successfully simulates the swarm behavior in shoal of fish when fish are looking for food, with small relative and absolute error.
Application Effect of Aquaculture IOT System
Authors: Zhang Yu , Hua Jing , Wang Yu Bin
Published: March 2013

The aquaculture IOT system consists of the water quality monitoring stations which are based on a wireless sensor network (WSN), meteorological station, water quality control station, on-site and remote monitoring center and the central cloud processing platform. If we apply this system effectively, we can modify the existing breeding mode at the cost of mass energy use and gain direct economic benefits. We got relative initial data from the field research in Yixing of Jiangsu province, and compared different aquaculture situation between farmers who used the system and who didn’t in 2011 through the parallel comparison method. We draw the conclusion that this system is helpful to save labor cost 1768.62 yuan/ha, increase river crab production 88.72 kg/ha and improve river crab sales revenue by 15.51%.
The Sensing Technologies in the Electric Vehicle Charging and Exchanging Station
Authors: Li Hui , Zhang Wei Shi , Shi Jin Yu , Ma Xi Yuan
Published: March 2013

The Electric Vehicle Charging and Exchanging (EVCE) station is the important infrastructure for the Electric Vehicle (EV) industry. Meanwhile, the sensing technologies can effectively obtain the key parameters from kinds of smart devices, which make it very suitable for intelligent management in EVCE station system. In this paper, according to the environment and supporting technologies for EVCE station, we introduce the sensing technologies in detail, including technologies about EV battery sensing, EV sensing, charging/exchanging station sensing and charging pile sensing, etc. Practice shows that the sensing technology can effectively improve EVCE station intelligence.
A Variable Rate Fertilization System Based on ARM and its Realization
Authors: Yu Ying Jie , Ge Zhen Yang , Zhang Shu Hui
Published: March 2013

A variable rate fertilizer application system with ARM microprocessor as control core was developed. The structure and realization principle of the system were introduced. The system consists of two velocity sensors of photoelectric encoder and proximity transducer, an ARM controller, and an executive unit of stepper motor. The system has automatic and manual variable rate fertilization modes. In the automatic mode, the system can be positioned automatically without GPS, and controls the stepping motor’s rotational speed according to the fertilizing amount in different grid to realize variable rate fertilization. In the manual mode, the controller combines the fertilizing amount in different grid input manually through the keys with the velocity of the applicator, and calculates the stepping motor’s rotational speed to realize the variable rate fertilizer application. The applicator working status can be seen in LCD on the controller. The experimental results show that the system can work properly.
Design of μC/GUI Interface Based on STM32 Embedded System
Authors: Guan Bei Bei , Tian Li Guo , Cheng Zhen Zhong , Chen Zhi Liang , Wu Xing Li
Published: March 2013

The wide use of GUI (Graphic User Interface - graphical User Interface) is one of the great achievements in today's computer development. μC/GUI, as one of the mature GUI technology, becomes more and more common in embedded products. It has a small kernel, occupying less resources, high performance and high reliability etc, and can be designed as powerful and complex man-machine interface for embedded system. it uses the STM32 development board as the carrier. Software system is composed of hardware drivers, μC/OS-Ⅱ real-time operating system, FATFS file system, μC/GUI graphical interface system and so on. Analyzing the process and steps of μC/GUI transplantation, through the design of interface we can realizes simple human-computer interaction function. After tested, it works well.
Research on the Pose Detection and Control Methods of Robot with Series-Parallel Structure
Authors: Yang Dong , Li Tie Jun , Liu Jin Yue , Zhao Hai Wen
Published: March 2013

Aiming at the load requirements, positioning accuracy and workflow of building panels installed robot, developed a 6 DOF of a series-parallel hybrid structure installed robot. According to the structural features of parallel mechanism to the installation manipulator, designed a robot attitude sensing system based on the inclination and laser ranging sensor information feedback; according to the characteristics of the building environment, proposed the position detection method of panels to be installed based on the structured light vision; constructed the control system of the installation manipulator, and used teaching mode to achieve robot control and system calibration. The experimental data prove that, the control and sensing systems of panels installed robot, overcome the complexity of the building environment and the diversity of installation object, and can achieve the automated installation of building panels.
Jacobian Matrix of a Novel Continuum Robot for Search and Rescue
Authors: Meng Guang Zhu , Sun Ling Yu , Peng Ping , Meng Xian Chun , Wang Hong Mei , Zhang Jian Wei
Published: March 2013

In this paper, a novel continuum robot for search and rescue is presented. A forward kinematic model is derived by product of exponentials formula, compare with conventional D-H method, this method is concise and simplicity. Finally, based on the differential kinematics using the chain rule, the overall Jacobian of the robot is established. This approach can be generally applied to various continuum robots, regardless of the specific actuation system used.
A Comparative Study of AODV and DSDV Routing Protocol of the Vehicle Ad Hoc Network Based on NS2
Authors: Bai Yun , Ji Song Bo , Xue Yuan
Published: March 2013

This document analyzes the wireless ad hoc networks used in vehicle communication. Using the NS2 software, the typical ad hoc on-demand distance vector routing (AODV) and destination-sequenced distance-vector (DSDV) routing protocol are simulated respectively with 25 mobile nodes and 11 mobile nodes. By reasoning on the simulation data, many performance indicators including the routing protocol throughput, jitter, packet loss rate and end-to-end delay performance are compared and analyzed. Final we have come to an important conclusion that AODV is better than DSDV protocol on a number of performance indicators.
A Centroid Localization Algorithm for Wireless Sensor Networks Based on RSSI
Authors: Bai Yun , Li Chun Ming , Xue Yuan
Published: March 2013

In this paper, a new triangle centroid localization algorithm for wireless sensor networks based on received signal strength indicator (RSSI) was demonstrated in great detail, and was simulated using MATLAB , and was compared with the original algorithm. Finally, wireless localization system based on CC2430/31 was set up in IAR development environment. Through hardware testing and comparison, The impact on the localization accuracy is illustrated about the signal transmission loss, beacon node density and outside interference. The superiority of this new algorithm is verified.
Integrated Wireless and Wired Signal in the Hybrid Access System
Authors: Zhang Chun Lei , Yan Cai Hua , Chen Hai Ling
Published: March 2013

To meet the demands of different high bandwidth services, we demonstrated a hybrid access network simultaneously transmitting wired and wireless signals. In the downstream, wireless signals are modulated and transmitted in phase modulation format at the optical carrier and wired signals are re-modulated in intensity modulation format, different de-modulation schemes are used at optical network unit (ONU) side; In the upstream, carrier reuse technology are adopted to re-modulate and transmit uplink signals to the optical line terminal (OLT). Simulation results show user ends could get acceptable performance of the wirless and wired signals.
Study on Adaptive Modulation Used in Fading Channels
Authors: Wang Xin , Gao Wei , Song Zong Xi
Published: March 2013

Most of traditional modulation and coding techniques do not adapt to fading or nonlinear conditions. These non-adaptive methods require a fix-link margin to maintain acceptable performance when the channel quality is poor. Thus, these systems are effectively designed for the worst-case channel conditions, resulting in insufficient utilization of the full channel capacity. Adapting to signal fading allows the channel to be used more efficiently since the power rate can be adjusted to take advantage of favorable channel conditions. In this paper, we present a simplified mathematical model to calculate the probability of SER for any given constellation of M-QAM. This model plays an important role in designing spectrally efficient adaptive modulation over nonlinear mobile channels. Instantaneous spectral efficiency and its histogram distribution are found for linear and nonlinear channel cases.
Construction and Evaluation of Three-Dimensional Gamut for UHDTV Based on the Additive Color Mixing Principle
Authors: Li Yan , Li Na , Wang Jing , Li Gui Ling
Published: March 2013

For UHDTV systems specified by ITU, the paper calculated gamut coverage of UHDTV systems. The paper also constructed a three-dimensional gamut model for UHDTV and computed the color solid volume in the L*a*b* color space. Then it was compared with HDTV systems and Pointer gamut. The result shows that UHDTV gamut completely contains HDTV gamut and Pointer gamut.
A Probabilistic Routing Protocol Based on Priori Information for Cognitive Radio Sensor Networks
Authors: Jin Zi Long , Kim Beom Seok , Guan Dong Hai , Cho Jin Sung
Published: March 2013

The cognitive radio technology has been adopted as a promised solution to deal with overcrowded problem in ISM band. In wireless sensor networks, the cognitive radio technology enables sensor nodes to occupy licensed band in opportunistic manner and introduces advantages of improving spectrum utilization and increasing system throughput. By considering the opportunistic spectrum access nature, in this paper, we aim to provide a stable path selection scheme for cognitive radio sensor networks. The proposed routing protocol utilizes priori delivery information and derives a novel routing metric for the optimal path selection. The routing metric is derived from naïve Bayes inference and used to indicate the path stability by means of delivery probability. We show through extensive simulations that the proposed routing protocol is efficient to find the most probable delivery path and increase the system throughput.
PcAVP - Adaptable Vertical Partitioning Algorithm Based on Privacy Constraint for Distributed Database System
Authors: Jiang Jie , Gu Zhu Yan , Chen Tie Ming
Published: March 2013

Vertical partitioning is a process of generating fragments, each of which is composed of attributes with high affinity. It is widely used in the distributed database to improve the efficiency of system by reducing the connection between the table access operations. The current research on vertical partitioning is mainly focused on how to measure the "affinity" to get the best-fit vertical partitioning and the n-way vertical partitioning which support generating the specific number of fragments required by the user. In this paper, we propose a vertical partitioning algorithm based on privacy constraint. It supports both the best-fit vertical partitioning and the n-way vertical partitioning. It also provides the data privacy protection by privacy constraint checking. We conduct several experimental results to show that our algorithm not only keeps higher efficiency, but also provides data privacy protection.
Design of Wireless Sensor System for Agricultural Micro Environment Based on WiFi
Authors: Shi Yun Bo , Shi Ye Ping , Xiu De Bin , Wang Xuan , Wang Meng Meng , Wang Rong Xin
Published: March 2013

The Implementation of microenvironment monitoring system in network for greenhouse is based on the agricultural greenhouse micro environment and combined with wireless sensor network technology. Information is received by the sensors in the front system with the parameters such as temperature, humidity, light and carbon dioxide. the sensor signal acquisition and A/D conversion is controlled by the processor module which is also the controller of the WiFi wireless module. Wireless router relay communication enlarging the monitoring area is used in the system design. The communication between the terminal nodes and the monitoring center and a series of process like data collecting, processing, transmitting and displaying are all controlled by software. The system has the benefits of networking quick and easy, stable operation, good extension and low power consumption, and it can meet the needs of the micro environment measurement and control system.
Application of Virtual Reality Technology in the Distribution Network Living Work Methods Research
Authors: Liu Yao Jun , Lu Xiu Feng , Qi Fang , Liu Chun Xiang
Published: March 2013

In recent years, with power supply reliability requirements increased, living work projects in distribution network are developed extensive. Except the traditional projects, it is becoming more and more prominent to expand the living work projects in the distribution network. But, research the bran-new living work methods have some problems like long period, significant risk and high cost. This paper base on the theoretical arithmetic, use the virtual reality technology to simulate and research the 10kV distribution network 1-tower double-circuit transmission line living work and the model is established. Compared to the traditional living work methods, introduce the virtual reality technology supply a new train of thought to research the living work methods, it greatly reduces the period of researching new living work methods, and effectively cut down the costing on the experimental stage of traditional researching methods.
CS-LBF Improved Model for 3D Medical Image Segmentation
Authors: Zhao Wen Cang , Zhang Jun Bo
Published: March 2013

This paper presents an algorithm for three-dimensional medical image segmentation based on the Contrast and Shape Constrained Local Binary Fitting improved model. Due to Local Binary Fitting model is sensitive to initialization and easy to fall into local extreme value, the new algorithm adds contrast constraint term to the Local Binary Fitting model, aiming at solving the common existed problem of inconsistent brightness and low contrast ratio. Adding shape constraint term can improve the original Local Binary Fitting model by constructing shape constraint energy field around the average shape by the level set method to deal with the leak of deformation curve. In order to promote the speed of model evolution, the kernel function is simplified. Two-dimensional Contrast and Shape Constrained Local Binary Fitting model is then extended to three-dimensional and a three-dimensional dental pulp image is segmented. Experimental results show that the segmentation accuracy, the connection degree and the efficiency of the new method are greatly improved compared to original LBF model.
Extracting Hot Topics from Microblogging Based on Keywords Detection and Text Clustering
Authors: Yi Bo , Wang Yong , Chen Xin , Wang Ying
Published: March 2013

Following with news and forums, microblogging becomes the third largest source of Internet public opinion. So it is necessary to do research of microblogging topic discovery. Firstly, we detect hot topics through the the keywords detection algorithm. Secondly, elect most popular microblogging text in the massive microblogging text by combining of keywords weigh and textual information entropy. Finally, using the dynamic clustering algorithm, the microblogging text elected, will form into different news topics by clustering polymerization. According to experimental validation of the true microblogging data, hot topic can be effectively detected from the text of a large number through the method.
Research on Security Analysis of RFID Based on Multiple Readers
Authors: Hou Yi , Ma Jia Lin
Published: March 2013

The specialties and limitation of RFID system and device will incur lots of security problems especially when the system contains a lot of tags and many readers，the traditional methods become helpless. Here we present and analyze an improved hash key technique based on multiple readers.
Automatic Marking of SQL Server Based on SQL-DMO
Authors: Chen Yao Fei , Zheng Wei , Chen Huan Tong
Published: March 2013

SQL Server skill assessment is deficient. This article describes the SQL Server object model SQL-DMO. Propose the process of SQL Server skill assessment: test paper generation, Skill assessment and Automatic marking. Analysis two key techniques of skill assessment based on SQL-DMO. One is getting operating information based on SQL-DMO. The other is automatic marking for Skill and Operation. Besides, automatic marking rules for database object creating, modifying and deleting are focused on. The author uses SQL-DMO method to realize database object information acquisition, and implement automatic marking for SQL Server database skill assessment.
Design and Application of an Intelligent Middleware Based on Resource Migration
Authors: Qi Chang Xing , Ma Jia Lin , Wang Ye
Published: March 2013

This paper analysises the feature and necessity of resource migration. And the main task of resource migration is to transfer the data and files among heterogeneous systems without data loss and error. So the logical structure model and relative components are defined in the paper and the function of the components and handling process of the middleware are described in detail. After these, The middleware program sample is developed and applicated between archives system and business system . In the end, the results and inadequacies of the middleware are analysised. It is seen that the middleware can solve the problems of data loss and confirm the stable operation of resource migration.
Web Application Integration Framework Based on OSGi
Authors: Zeng Qing Peng , Wu Shui Xiu
Published: March 2013

In the view of current application software appeared complex, huge demand and update frequently, the frame technology is introduced to the software development process in order to improve the software development speed and quality. OSGi (Open Service Gateway Initiative) as a field development framework provides a good environment, system development based on OSGi has many advantages, including the dynamic change system behavior, it has hot swap plug in system structure, and with high reusability and efficiency. The paper constructs a Web application integration framework based on OSGi, which can effectively solve those problems of the framework development in the territory is complex, the integration framework’s reusability is better , and with easy extension characteristics.
Research of Mobile GIS Development Status
Authors: Chen Hua Jun , Zhang Jia Hua , Xiao Ke Yan
Published: March 2013

Mobile GIS combines geographic information systems, mobile positioning technology, embedded systems, wireless communication technology and other technologies. It is the new direction of development of GIS technology. This paper first introduces the composition and features. Then development types, platform and languages are given detailed introduction. Finally the paper analyzes the problems of the development of mobile GIS and the prospect of Mobile GIS is presented.
Task Scheduling Algorithm Based on Improved Min-Min Algorithm in Cloud Computing Environment
Authors: Wang Guan , Yu Hai Cun
Published: March 2013

Task schedule algorithms directly related to the speed and quality of schedule. Min-Min algorithm always completes the shortest total completion time task first, and has the characteristic of simple and shortest completion time. This paper research scheduling algorithm based on Min—Min algorithm. The result shows that the proposed algorithm is efficient in the cloud computing environment.
Effect of Deformation on the Corrosion Behavior of Chromium Bronze
Authors: Zhang Ya Ni , Wang Dang Hui , Xu Tian Han
Published: March 2013

The service life of material is much related with its corrosion resistance. Thus, the investigation on corrosion behavior is important for the better use of material. In this paper, the corrosion behavior of deformed chromium bronze experienced different processing was investigated in NaCl environment using electrochemical measurements and mass-loss tests. It has showed that the potentiodynamic polarization curves of cold rolled specimen coincide with that of cold worked specimen in two concentration of NaCl solution. The last cold working has little effect on the electrochemical behavior of cold rolled chromium bronze.The NaCl fog experiment showed that the corrosion resistance of cold rolled specimen is slightly better than that of cold worked specimen, and the mass-loss for two kinds of specimen are similar in the initial stage but the gap is increasing with corrosion time. The corrosion scales on the surface of specimen, accumulated in the form of island produced in the NaCl fog experiment , has little hindered effect on corrosion behavior.
Precision Vertical Grinding of Cemented Tungsten Carbide Using CBN Wheels
Authors: He Zhi Jian , Liang Xu Kun
Published: March 2013

A set of precision vertical grinding experiment on WC-CO cemented tungsten carbide materials was carried out using cubic boron nitride (CBN) grinding wheel. Different grinding parameters such as rotation speeds of workpiece, feed rates and grinding depths were employed during precision vertical grinding. Surface roughness was measured for studying the grinding charateristics of WC-CO cemented tungsten carbide in this removal mode. Optimal grinding parameters were obtained by changing the process parameters. The research results have an important significance to improve grinding quality and efficiency for precision grinding cemented tungsten carbide materials.
Study on Volume Performance of Conductive Asphalt Concrete Based on Freeze-Thaw Cycle
Authors: Pan Pan , Sun Chang Jun , Tang Ning , Chen Ming Yu , Wu Shao Peng
Published: March 2013

Conductive asphalt concrete, a kind of intelligent materials, can serve as asphalt solar collector, asphalt heater and self monitor. And moisture damage is one of the most common performance degradation of asphalt concrete. This paper investigates the volume properties of conductive asphalt concrete based on Freeze-thaw cycles. Marshall specimen was frozen and thawed repeatedly and a cycle consists 16h at -18oC and 8h at 60oC. The change of air void and weight loss ratio were chosen to evaluate the moisture resistance of conductive asphalt concrete. Three types of asphalt mixture (control, CAC 1 and CAC 2) were used to study the effect of initial void and material composition on moisture resistance. The results show that both the framework structures and the material composition have a great effect on antifreeze-thaw property of asphalt concrete, which provides an efficient guidance for application of this technology in pavement.
Anealing Effect on the Microstructure and Mechanical Properties of LaB6 Films
Authors: Hu Li Jie , Zhang Lin , Lin Jie , Min Guang Hui
Published: March 2013

Lathanum hexaboride films were deposited by dc magnetron sputtering with the same sputtering parameters. AFM, XRD, Raman spectrum was used to characterize the film. The as-deposited films were annealed at 400 oC, 500 oC and 600 oC, respectively. After 400 oC’s annealing, morphology of fracture cross-sections of the films exhibited evolutions from columnar to the equiaxial, and the crystallinity of the film was improved as well. It was also found annealing process generated negative effect on the film’s hardness and elastic modulus.
Study on Present Status of China's Hematite Processing Technology
Authors: Jia Qing Mei , Li Feng Jiu , Qu Yun Long
Published: March 2013

his template explains and demonstrates how to prepare your camera-ready paper for Trans Tech Publications. The best is to read these instructions and follow the outline of this text. Please make the page settings of your word processor to A4 format (21 x 29,7 cm or 8 x 11 inches); with the margins: Comments on technology progress of hematite processing,and introduce the hematite mineral processing technology, put forward the development direction of hematite precessing.
Torsion-Dependent Circular Magnetization in Fe-Based Amorphous Wire
Authors: Li Yin Feng , Chen Pei Ying , Li Lan Zhong , Feng Su Qin , Wang Cheng Lin , Liu Peng , Qiao Jian Sheng
Published: March 2013

The circular permeability,  =  + j, of a Fe73.5Cu1Nb3Si13.5B9 annealed (500oC, 1 h) amorphous wire was obtained from the measurements of impedance, Z = R + jX = R + jL, as a function of circular magnetic AC field (H = 0.15 – 200A/m) and applied torsion ( = -7.5 – 11.5 rad/m). So the influence of  upon the circular magnetization has been studied. We found that the effects of applied torsion on the circular magnetization can be explained by considering the magneto-elastic interaction and a helical domain structure in the sample. The large change of  with  may be used as a torsion sensor.
Signal Detection Technology for Giant Magnetoresistance Sensors
Authors: Hu Jing Hua , Pan Meng Chun , Tian Wu Gang , Hu Jia Fei
Published: March 2013

Presently, many attentions have been paid on low-noise pre-amplifier circuits and steady signal processing methods, but seldom on the combination of two technologies. In this paper, a small size low noise pre-amplifier circuit with 110dB Common Mode Rejection Ratio（CMRR）has been developed for giant magnetoresistance sensors(GMR) and its equivalent input noise voltage density is about . In addition, we proposed a new signal processing method for the sensors. In the method, we defined the quotient between the complex multiplex computation times and the output data num as a new figure of merit to evaluate that algorithm efficiency in signal detection, and name that quotient the computation times -to- output data num ratio (CTOR). Simulation results showed that the new method realized better parameters evaluation precision and higher efficiency than Modified Rife method, could be implemented easily in embedded systems.