bluuebunny/crossref_metadata_2025 huggingface dataset:
Block Shear Behaviors of Angle Two-Bolted Connections with Austenitic Stainless Steel – Experiment and Finite Element Analysis
Authors: Kim Tae Soo , Kim Min Seung , Shin Sung Woo
Published: March 2013

Since stainless steel has significant characteristics such as its superior corrosion resistance, durability, aesthetic appeal etc., it has been utilized as structural members in buildings. Recently, ultimate behaviors and curling influence in austenitic stainless steel single shear bolted connections with thin-walled plane plates have been investigated by T.S. Kim. In this paper, finite element analysis (FEA) has been conducted based on the existing test results of angle bolted connections in fabricated with austenitic stainless steel. The validation of the numerical analysis prediction was verified through the comparison of test results for fracture mode, ultimate strength and curling occurrence. Curling (out-of- plane deformation) also observed in the connections with a long end distance. The curling caused the ultimate strength reduction and the ultimate strength reduction ratios (varied from 12% to 25%) caused by curling have been estimated quantitatively through the comparison of FEA results of FE models with free edge and restrained curling.
Finite Element Analysis and Structure Optimum Design of Lifting Padeye
Authors: Liu Zhong Chi , Zhou Bo , Tan Soon Keat
Published: March 2013

The lifting padeyes are widely used in the offshore and shipbuilding industry. The design of lifting padeye requires extremely high safe reliability and economic rationality. Based on finite element analysis (FEA), the variations of stress and deformation with external force and hoist angle are analyzed. For minimizing cost of steel, optimum design models of lifting padeye were built and the reliability of the optimum design scheme was proved. The results show that the optimum design accords with structure design principle and the cost of padeye steel reduce notably.
Effects of Aerodynamic Force on Strength Characteristics of Turbocharger Blades
Authors: Luo Qing Guo , Si Dong Ya , Wang Xu Dong , Ran Guang Zheng
Published: March 2013

One-way fluid-solid interaction analysis of a centrifugal compressor has been investigated by aerodynamic and finite-element method in this paper. An accurate three-dimensional flow passage model of the compressor has been created;the stress distribution of the main flow path has been obtained. The aerodynamic force was applied to the impeller blades. Finally, three kinds of loads were applied to the main blades and splitter blades. Intensive study of thestrength characteristic of the blades has been made.
Effect of Cement Matrix’s Type on the Shear Performance of Lightly Reinforced Squat Shear Walls Subjected to Cyclic Loading
Authors: Kang Su Won , Yun Hyun Do
Published: March 2013

This study was conducted to experimentally investigate the shear behavior of non-ductile squat shear walls with different cement matrixes such as normal concrete, fiber-reinforced concrete(FRC), and strain-hardening cement composite(SHCC). The cement matrix type’s effect in the lightly reinforced squat shear wall was evaluated through the testing of three one-third scale walls with a height-to-length ratio (hw/lw) of 0.55 under top displacement reversals. Experimental results show that the cement matrix type in the non-seismically detailed squat shear walls has a significant effect on the shear behavior and failure mode. Compared to reinforced FRC and SHCC shear walls, reinforced concrete wall exhibited brittle behavior. Reinforcing fibers in the FRC and SHCC mitigated the crack damage of wall and increase the shear strength.
Simulation of Solar Energy Storage System
Authors: Elhaj Mohamed A. , Yassin Jamal S. , Mutordi Ali Ahmed
Published: March 2013

The present study deals with the main parameters of a storage tank-collector system, the proposal system included a flat plate solar collector coupling by a storage unit to serve the energy requirement of small Libyan family (3-5 persons).The studied parameters included the selection of the storage size needed for a given collector area and a given load under Libyan climatic condition. These parameters include the appropriate location for inlet and outlet ports of the hot water in the storage tank.A mathematical simulation model was written based on the given parameters and the input data of Misurata city in libya the location (L=32.15 N, 15.15W) as a case study. The developed program was carried out in visual basic 6.The final results showed that a storage tank with a capacity of (125 Litters per square meters) is sufficient to cover the requirement of Libyan family (3-5 persons). Also,. Furthermore, the hot water from the collector should be entered the storage tank at the upper portion of the tank to satisfy for the previous enhancement.
An Assembly Simulation Optimization Method Based on View Transformation
Authors: Tang Jian Jun , Tian Xi Tian , Geng Jun Hao , Bai Ming Xing , Liu Xiang Wei
Published: March 2013

In order to improve showing effect of the aircraft assembly simulation, a new assembly process simulation optimization method was proposed with combining evaluation of viewpoints with view transformation. First, viewpoints evaluation principle was put forward according to assembly simulation features; then a new view coordinate system was calculated based on the view coordinate system transformation matrix by integrating the direction of assembly paths with the viewpoints evaluation principle; finally, entire optimized process of assembly simulation was analyzed. Efficiency of this method was verified by comparing the result of the optimized wing box assembly simulation with the one which had not been optimized.
Finite Element Analysis of High-Decker Bus Frontal Impact Based on ECE-Regulation No.29
Authors: Rooppakhun Supakit , Bua-Ngam Sarawut
Published: March 2013

In Thailand, according to the bus accident statistics referred to Department of Land Transport (DLT), the highest risk represents the frontal crash accidents. In case of frontal crashworthiness, the high- decker bus safety was referred to the regulation no.29 of United Nations Economic Commission for Europe (ECE-R29). In this study, the frontal impact analysis of the high-decker passenger bus structure based on ECE-R29 using Finite Element (FE) analysis was focused on. The energy absorption including to the total deformation of the frontal cabin were evaluated. Three-dimensional FE model of frontal bus structure with- and without- simple impact attenuator were created and analyzed using ANSYS/Explicit software. In accordance with the results, the average magnitude of kinetic energy in case of impact attenuator revealed the value lower than those without impact attenuator owing to absorb energy in the impact attenuator. In addition, the total deformation regarding to the safe zone of the frontal cabin in the case of with impact attenuator were lower than without impact attenuator as 75.8%. Therefore, the frontal impact attenuator should be recommended to a high-decker bus for the driver protection in the event of crash accident.
Calculation Methods of the Local Structure Behavior of Unbonded Flexible Pipes
Authors: Li Zhi Bo , Xu Hui , Zhang Gui Zhen
Published: March 2013

In this paper, the nonlinear relationship between the bending moment and curvature of non-bonded flexible pipes was studied. It was found that the relation was a function of internal and external pressure, axial force, and bending moment load. The model used in this paper took into consideration of the flexural, tensile and torsional strength of layers as well as the frictions between them. Symmetrical axial load was first applied, and then the bending load. Due to friction, the response of the unbonded flexible pipes is hysteretic to the loads. In conclusion, the response of unbonded flexible pipes are both related to its own structural properties and external loads.Coupling factors of different conditions should also be considered.
Research of Slider-Crank Massager Noise Fault Diagnosis and Treatment
Authors: Lv Yong Hu , Li Ji Bin , Zhong Guo Wei , Yang Jia Li , Wang Chang Sheng , Wang Hai Xiong
Published: March 2013

The abnormal periodic noise from the slider-crank massager was complained by many consumers when it was under unilateral massage. By anglicizing the worm non-working surface stained with marking compound, the reason of the abnormal periodic noise which stemming from repeated mating of non-normal mating surfaces of the worm gear mechanism is founded. In order to solve the problem the overrunning clutch is used as it’s beyond separation functions. When the force is loaded to passive wheel, the clutch is linked; while the load becomes kinetic energy, the power will be separated immediately. The characteristic determines that the overrunning clutch is one of the best choices to separate the load on the slider-crank massager. And the results of the experiment indicate that the method has a significant effect to reduce noise. It also has a practical significance to the common problems of the mechanism and to the related scientific problems.
Nanosilica and its Future Prospects in Concrete
Authors: Fares Galal , Khan Mohammad Iqbal
Published: March 2013

The implementation of nanotechnology in concrete has led to an active incorporation of nano silica in concrete in a global level. Different methods of nano silica production are available and vary from expensive to cost-effective routes. Nano silica particle sizes and their chemical and physical nature depend on the method of production. Several types of dispersed nano silica are recommended to be used in concrete due to practical reason. However, the dry powders of nano silica particles are difficult to be dispersed in concrete and require special types or family of nano superplasticizers. The effective addition of nS leads to C-S-H with improved cementitious properties.
Variable Deadband Sampling and T-S Fuzzy PID Co-Design for Optimizing QoS and QoP of Wireless Networked Control Systems
Authors: Tang Guo Fu , Zhang Yan Xin
Published: March 2013

Variable deadband sampling is used in wireless networked control systems to reduce the network message. In this paper the T-S fuzzy PID with variable deadband sampling is designed to optimize the quality of network services and the quality of control performance in closed control loop. Furthermore, Kalman filtering algorithms dealing with variable deadband sampling are considered in the paper. The comparison results of proposed method and PID with period sampling are presented based on the extensive simulations by using TrueTime 1.5 toolbox for Matlab/simulink, and the simulation results verify the effectiveness of the proposed method.
Influence of Clique Potential Parameters on Classification Using Bayesian MRF Model for Remote Sensing Image in Dali Erhai Basin
Authors: Duan Hai Jun , Wu Guang Min , Liu Dan , Mai John D. , Chen Jian Ming
Published: March 2013

Image classification of remote sensing data is an important topic and long-term tasks in applications [1]. Markov random field (MRF) has more advantages in processing contextual information [2]. Bayesian approach enables the incorporation of prior model and likelihood distribution, this paper has formulated a Bayesian-MRF classification model based on MAP-ICM framework. It uses Potts model in label field and assume Gaussian distribution in observation field. According to maximum a posteriori (MAP) criterion, each new classified label can be obtained by the minimum of energy using Iterated Conditional Modes (ICM) algorithm. Finally, classification tasks are carried out by Bayesian-MRF classification model. Experimental results show that: (1) Clique potential parameters affect classification greatly. When it is 0.5, the classification accuracy reaches maximum with the best classification result for study area of Dali Erhai Lake basin using landsat TM data. (2) Bayesian MRF model have obvious advantages in classification for neighbourhood pixels so that it can separate Shadow class from Water class because the Shadow in mountain areas is very similar to Water in spectrum. In this case study, the best classification accuracy reaches 95.8%. The approaches and results will have important reference value for applications such as land use/cover classification, environment/ecological monitoring etc.
A Novel Virtual Vector Field Method for Image Segmentation Inspired by Physical Electro-Static Force
Authors: Zhuang Xiao Dong , Ji Xiao Peng , Wei Zhi Qiang , Wang Han Ping
Published: March 2013

A novel vector field transform is proposed for digital images, which is inspired by the electro-static analogy. By introducing the factor of gray-scale difference into the repulsion vector between image points, the diffusing vector field is obtained by the transform. A new image segmentation method is then presented based on the diffusing vector field. The experimental results have proved the method’s effectiveness.
DC Power Dynamic Management System in Digitalized Transformer Substation
Authors: Li Pei Ying , Pan Yu Tian , Qin Qing Zhang
Published: March 2013

In this paper, using current advanced computer and real-time Ethernet technologies to design a set of high performances’ DC power dynamic management system for digitalized transformer substation. In the system, the operation states and fault conditions of DC power system can be remote monitored and controlled, the state informations of the feeder switches are real time displayed, the state transformations of DC generatrices are remote controlled, the states of equalizing charge and floating charge of the battery charger are remote controlled and remote transformed, the parameters of the battery charger are remote set, etc. In addition, the operation modes of the whole DC power system in the transformer substation are shown by way of simulation map installed in the upper management machine. This dynamic management system greatly contribute to the construction of unwatched, intelligentized, digitalized transformer substation.
Blind Adaptive Channel Equalization Using Modified CMA
Authors: Shouyu Sun
Published: March 2013

The constant modulus algorithm (CMA) equalizer is perhaps the best known and the most popular scheme for blind adaptive channel equalization. In this paper, a modified constant modulus algorithm (modified CMA or MCMA) is proposed by modifying its error function. We have discussed the MCMA to blind channel equalization for baud-rat sampling in single-user case. Computer simulations are provided for 8PSK signals in noise environments under frequency selective channels. Results demonstrate that the MCMA displays much superior performance to the CMA for both convergence-time and intersymbol interference (ISI) or mean square error (MSE).
The Contour Size Detection of Driver Airbag Based on Image Processing Technology
Authors: Wang Xiao Dong , Chen Xiao Wei , Zhang Wei , Liu Bo , An Liang Dong
Published: March 2013

In this paper we have developed a new methodology for detecting the contour size of driver airbag based on image processing technology and Machine vision. Through the CCD camera we can obtain the image, and then do the following operations by a computer, such as binarization, edge extraction and so on the other image preprocessing. This methodology uses intelligent template matching technology to detect the airbags and by comparing with the predefined parameter to determine whether the contour size is qualified .The experimental results show that: this new detection method solves the disadvantage of traditional detection method, such as the low detection efficiency, the detection precision is not high, the poor detection repeatability, the higher rate of detection miscarriage of justice.
Integration Research of Thermoelectric Enterprise Marketing Management Information System
Authors: Li Zhi Gang , Fu Ze Tian , He Jia Yong , Qi Quan , Zhu Dong Qing
Published: March 2013

Due to business expansion and increased market competition, Tianfu thermoelectric original electric gas marketing system can no longer meet the needs of enterprise development which lead to information islands. In response to these issues, based on the business needs, this paper constructed a marketing network management system platform integrated with electricity, heat and gas for the thermal power enterprises. This system includes: 1) Establishment of enterprise data center and centralized storage of the business system data. 2) Establishment of enterprise portal system for achievement of single sign-on. 3) Establishment of power energy information collection and management system of the power purchase, supply and sale departments. 4) Establishment of "all-in-one-card" system including electricity, heat and gas IC card. 5) Creation of a marketing analysis and strategic decision-making system. The system platform can offer efficient and reliable basis for business processing capabilities to electricity, heat, and gas marketing business.
Data Imputation for Regional Traffic Index Based on GSO-NN
Authors: Zhang Yang
Published: March 2013

The incomplete traffic data in urban road networks greatly affect the quality and performance of traffic information platform. The importance of effectively imputing the missing values emerges. The paper introduces a three-layer feed-forward neural network to missing traffic index prediction, where the group search optimization (GSO) is proposed to optimize the connection weights and thresholds to solve the problem of falling into the local optima. It is the first time to apply the technique to missing data imputation. Simulations are presented to demonstrate the accuracies and effectiveness of the proposed methodologies. This reveals that it is a promising approach in missing data prediction.
A New Local and Global Model to Iris Recognition
Authors: Xu Xiao Wen
Published: March 2013

Traditional iris recognition systems transfer iris images to polar coordinates, normalize the images and achieve rotation invariance by rotating the feature vector. In order to decrease the complexity of the typical iris recognition method, we propose a new method of iris recognition based on global and local model that are extracted from preprocessed iris image without normalizing. Firstly, we applied a bank of no-tensor product wavelet filters to extract the global features of the iris. Secondly, we used a SIFT method to extract the local features points of the selected regions. Finally, we tested the similarity distances of local and global features with different weights. Experimental results show that the proposed method in this paper has the recognition accuracy of 99.5% when the equal error rate is 0.94%. Without normalizing the iris images, the proposed approach can obtain very good recognition performance.
Mixed H∞/H2 Output Feedback Stability Control for Dual-Motor Independent Drive Electric Vehicle
Authors: Lin Cheng , Peng Chun Lei
Published: March 2013

This paper presents the design of mixed H∞/H2Output Feedback Controller for Independent Drive Electric Vehicle Stability Control. It generates yaw moment by applying driving intervention at front Independent driving wheels according to the vehicle states. The performance of the proposed controller is evaluated through a series of simulations under different velocity and different mass. The simulation results show that the controller can help vehicle against a certain range of uncertainty (speeds and loads) and get excellent robust performance.
Amplifier Design on 16-Channel High-Frequency Current Drive
Authors: Yu Xie
Published: March 2013

According to the situation that the transistor output interface type of PLC output current is too small to meet requirements of high-speed, frequently on or off electromagnetic valve and other great current load drives, a current driver amplifier was developed which connected PLC output interface and load. Its key realization technologies include signal acquisition input, bidirectional conducting, input and output display, and designs of isolation circuit of input and output and output amplification processing circuit. The device uses bidirectional optocoupler and bidirectional LED to gather small DC current signal which does not distinguish between positive and negative polarities and achieve photoelectric isolation, controls drive load work of MOS transistor conducting and achieves current amplification through amplification driver link of emitter output, and has high frequently on-off operation, simple wiring, great drive current, strong versatility, high reliability and other characteristics.
Design of Automatic Detection System for Temperature Sensor Based on LabVIEW
Authors: Sun Rui , An Liang Dong , Zhang Wei , Chen Xiao Wei , Guo Zhi Gang
Published: March 2013

The examination of temperature sensor is a complicated process. Generally speaking that the examination is done by manual. But the manual detection has its disadvantages, such as connection trifles, inefficient and so on. In order to solve above disadvantages, this paper introduces a design of automatic detection system for temperature sensor based on virtual instrument. It elaborates the choice of hardware and the design of software. The system is mainly aimed at temperature sensor for resistance and insulation detection. Then we can determine whether the main parameters of temperature sensor are up to standard or not. The system realizes the automation of detection process. In the practical application, it has achieved better effect. In addition, this system can be used by other sensor detection when it has been part of the modification. So it has wide application range and higher practicability.
A Novel Preprocessing Method for Palm Vein
Authors: Zhang Huan , Hu Ding Jun
Published: March 2013

This paper introduces a novel preprocessing method for palm vein recognition system. Preprocessing is a key step of palm vein recognition system. In the step of preprocessing, the vein vessel under the palm skin is expected to be exactly extracted. In our method, a certain video sequence in which all the palm vein is included is captured by self-designed palm vein capture device. In the step of data collection, user's palm is restrained and he or she is asked to keep his or her palm still. Spectral density method is used to find the stable certain-frequency signal in the captured video sequence. The stable certain-frequency signal is expected to represent the vein vessel in the palm. Experimental results show the effectiveness of the proposed method.
Graft Polymerization of L-Lactide onto Cellulose in Ionic Liquid via Twin Screw Extruder
Authors: Zhong Xuan , Tong Xian Tao , Yu Mu Huo , Li Hai Feng , Li Huan , Li Xin Da , Gibril Magdi E. , Zhang Yue , Han Ke Qing
Published: March 2013

A twin-screw extruder was used to carry out the ring opening graft polymerization of L-lactide onto cellulose through reactive extrusion process. Ionic liquid (1-butyl-3-methylimidazolium chloride) [Bmim]Cl and Sn(oct)2 were used as solvent and catalyst, respectively. FTIR, TGA and XRD were used to investigate the structure, thermal stability and crystalline behavior of the reaction products. The result showed a successful ring opening polymerization of L-lactide on cellulose. Furthermore, it showed a increased crystalline degree and thermal stability after being introduced the PLLA.
Effect of Different Graft Polymerization Systems on Surface Modification of Aramid Fibers with Γ-Ray Radiation
Authors: Xing Li Xin , Liu Li , He Miao , Wu Zi Jian , Huang Yu Dong
Published: March 2013

The poor wetting property between aramid fiber and resin results in the low interfacial performance due to the inertia and smooth surface of aramid. 60Co gamma-ray was used to modify the surface of domestic aramid fiber in the medium of epoxy chloropropane and diethanolamine respectively. The properties of aramid/epoxy composites were characterized by interface shear strength (IFSS) and the effect of two graft polymerization systems on fiber surface was discussed. The results showed that in an irradiation dose of 400kGy, when chloropropane and diethanolamine were used respectively as the graft system, the IFSS value of the composite material reached 86.53MPa and 70.37MPa, and compared with the untreated sample, each increase of 31.23% and 6.72%. High-energy radiation treatment increased the surface energy of aramid. The original smooth surface was disappeared. Oxygen content on fiber surface greatly risen, and aramid surface activity increased.
An Efficient View-Point Invariant Detector and Descriptor
Authors: Xu Zheng Guang , Chen Chen , Liu Xu Hong
Published: March 2013

Many computer vision applications need keypoint correspondence between images under different view conditions. Generally speaking, traditional algorithms target applications with either good performance in invariance to affine transformation or speed of computation. Nowadays, the widely usage of computer vision algorithms on handle devices such as mobile phones and embedded devices with low memory and computation capability has proposed a target of making descriptors faster to computer and more compact while remaining robust to affine transformation and noise. To best address the whole process, this paper covers keypoint detection, description and matching. Binary descriptors are computed by comparing the intensities of two sampling points in image patches and they are matched by Hamming distance using an SSE 4.2 optimized popcount. In experiment results, we will show that our algorithm is fast to compute with lower memory usage and invariant to view-point change, blur change, brightness change, and JPEG compression.
Preparation and Properties Testing of Intelligent Color-Changing Camouflage Coating
Authors: Zhang Juan , Yu Jiang , Jiao Jin Feng , Chen Hao , Liu Pei
Published: March 2013

The traditional camouflage way is only used to camouflage the military objectives in the fixed background. As the seasons and temperature change, the background color is undergoing tremendous changes. To solve this problem, a new kind of intelligent camouflage coating was invented whose color changes with the temperature and blends with the background. Through orthogonal design and experiments, the composition of raw materials and mixture ratio has been determined. The physical and chemical performances of the coating such as drying time and color-changing temperature have been tested. The result shows that the coating has good coating effect, excellent mechanical and chemical performance which can meet the camouflage requirements of changing seasons.
A Method of Determining the Pose of Planar Target in Vision Detection System
Authors: Zhang Sheng Nan , Wang Bo Shi , Yuan Wei Qi
Published: March 2013

Planar target is a location reference that is widely used in vision detection system. Based on monocular vision and circular markers on the planar target, a new method of determining the pose of target spatial plane is proposed. Since CCD image of a circle is an ellipse ,determining the pose of spatial plane may be transformed into determining the pose of ellipse. Ellipse curve equation of circle’s image is deduced and the independent parameters of ellipse are obtained, the relationship between spatial plane and ellipse parameters is established, thus the pose of spatial plane can be determined. By calculating the relative displacement with the standard plane that its depth information is known, the depth information from the center of ellipse image to the camera coordinate system is obtained. The algorithm is simple and fast, and it can be widely used in monocular vision detection.
Comparison of Model Checking Tools
Authors: Gong Wei , Jia Jun Wei
Published: March 2013

Model Checking is a method for verification. The model will be checked until the specification of it is proved or disproved. With the rising complexity of big models, there are non-checkable cases, in which cases the problem can be analyzed by some models, for example, bounded Model Checking means to analyze the model until a defined time or depth. The verification happens automatically. The programs for doing this are called Model Checking Tools or Model Checker. Model Checking are used in both software and hardware verification. It is an inherent part of hardware verification, whereas it is less used in the software verification.
Cyber Security Datasets Research
Authors: Wang Zhi Gang , Hu Chang Zhen , Hao Ming Lei , Lu Fang
Published: March 2013

Data is the basis for cyber security research. Correct understanding and rapid access to rich and reliable data is a good beginning of our research work. In this paper we present a novel classification method of cyber security data. In addition, we collect and list some datasets, which can better help you to carry out research.
Structure, Electrical and Optical Properties of the Polar ZnO(0001) Surfaces
Authors: Xiang Qian , Xiong Zhi Hua , Jiang Ying , Qin Zhen Zhen , Chen Lan Li
Published: March 2013

Based on the density functional theory, using the first-principles calculations method, the geometrical structure, electronic structure and optical properties of the ZnO(0001) surface were investigated. The calculated results show that a great change appears in the structure after the surface relaxation. The new energy levels were found in the band structure. The conductivity of the ZnO (0001) surface becomes stronger, showing the electrical properties of metal. On the other hand, imaginary part of the dielectric function of the ZnO(0001) surface also changes certainly. A new peak is observed in the low energy region. The results provide a theoretical basis for photoelectric device manufacturing and further development on the ZnO surface.
Research on Cooperative Relay Transmission in Power Line Communication
Authors: Li Yong Shuang , Shang Qiu Feng , Li Xue Mei
Published: March 2013

In this paper, cooperative relay transmission in power line communication system is investigated. It is considered that channels between users and relays are disturbed by PLC noise. The half-duplex AF relaying model is used to measure the performance for the PLC system. The system performance under cooperative relaying is analyzed and compared. The PLC channel is considered as Middleton’s Class A noise model.
Two-Photon Absorption Photochromic Optical Image Storage in Indoly-Benzylfulgimide/PMMA Film
Authors: Sun Xiao Man , Neimule Menke , Yao Bao Li , Lei Ming , Wang Ying Li , Chao Lu Men , Chen Yi
Published: March 2013

As one kind of organic photochromic optical storage material, fulgides are well-known for their thermally irreversibility. The two-photon absorption 3D optical storage technology is one of the hot research topics in the field of high-density information storage. Using optical image storage technology the recording and reading rates can be improved. In this paper, it’s found that in one kind of 3-indoly-benzylfulgimide/PMMA film, there exits two-photon absorption property. And depending on this property, the two-photon absorption photochromic optical image storage was realized in an indoly-benzylfulgimide/PMMA film. It is proved that the N-benzyl-1,3,4-trimethyl-2-(2-methyl-) indoly-fulgimide has potential application in the two-photon absorption 3D optical storage.
A Novel Dual-Mode Low Pass Sigma-Delta Modulator Chip Design for WCDMA and Bluetooth Applications
Authors: Huang Jhin Fang , Lai Wen Cheng , Huang Kun Jie , Liu Ron Yi
Published: March 2013

A dual-mode low pass sigma-delta (ΣΔ) modulator at clock rates of 160 and 100 MHz respectively with cascaded integrators is presented for WCDMA and Bluetooth applications. One of main features is that cascaded integrators with feedback as well as distributed input coupling (CIFB) topology erase a summation amplifier and save power consumption. Another feature is that only one set loop filter is designed by switching capacitors to achieve a dual-mode function and greatly saves chip area. A prototype is fabricated in TSMC 0.18-m CMOS process. At the supply voltage of 1.8 V, measured results have achieved the SNDR of 42/33 dB over 1/2 MHz, respectively for Bluetooth/WCDMA. The chip dissipates a low power of 10.5 mW. Including pads the chip area is only 0.61 (0.71× 0.86) mm².
Energy Efficient Multi-Hop Wireless Sensor Networks with Cooperative MIMO Scheme
Authors: Peng Yu Yang , Choi Jaeho , Ren Zi Chen , Choi Jae Ho
Published: March 2013

For wireless sensor networks, energy efficiency is one of the most important subjects in recent research. In this paper, an energy-efficient multi-hop scheme based on cooperative MIMO (multiple-input multiple-output) technique is proposed for wireless sensor networks. Different from other papers, we consider a single cluster transmission scenario in which energy consumption is optimized by selecting the hop length and modulation constellation size. The optimal energy consumption formula is derived and proved mathematically. In addition, the minimum energy consumption per bit is calculated numerically.
Research and Implementation of Control Method for Time Grating Rotary Table with High Precision
Authors: Gao Zhong Hua
Published: March 2013

A new numerical control (NC) rotary table with high accuracy is presented. Time grating, which was taken as the angle measuring unit, was installed inside the rotary table to measure the angular displacement in real time. Moreover, the signal of time grating was used as the feedback to realize full-closed loop control for improving the control accuracy of the NC table. Furthermore, the problem of insufficient subdivision of the step angle of the stepping motor could be solved by increasing the transmission ratio of motor shaft and rotary table. Experiments prove that the NC rotary table has the advantages of high control accuracy and running steadily, and the NC system shows a good application prospect in the field of machining.
Location Selection of Public Transit Transfer Hubs Based on Gray NN Model Improved by GA
Authors: Tang Min An , Wang Xiao Ming , Yuan Shuang , Sun Zhen Rong
Published: March 2013

The public traffic flow has the gray characteristics of “small sample and poor information”, thereby a forecast method for transfer flow based on the gray soft computing is proposed. This method utilizes the gray system theory to establish gray neural network prediction model, aiming to improve performance of the neural network as well as the accuracy of the system’s prediction by using genetic algorithm. The results show that the optimized model can more accurately predict the traffic flow, providing a more effective way of location selection for public transit transfer hubs. Finally, take the planning of public transit transfer hubs in Lanzhou City as an example to carry out empirical analysis and evaluation for the transfer hubs using this method
The DOA Estimation Algorithm Based on a New Decoherence Method
Authors: Cong Yu Liang , Zhao Wei Jue , Yin Guang Xu , Zhao Chen Long
Published: March 2013

Because of the deficiencies of the spatial smoothing algorithm, we put forward a new decoherence method which overcomes the shortcomings. The coherent signal is estimated by DOA and compared with the spatial smoothing algorithm it has more advantage. The method does not lose array effective aperture while the spatial smoothing algorithm method will lose array effective aperture. It also avoids the high consistency requirement of the subarray. The simulation results by MATLAB show that the algorithm can effectively analysis the coherent signal.
Optical Storage Properties of Different Fulgides
Authors: Chao Lu Men , Neimule Menke , Yao Bao Li , Lei Ming , Wang Ying Li , Sun Xiao Man , Chen Yi
Published: March 2013

As one kind of organic photochromic optical storage material, fulgides are well-known for their thermally irreversibility. In this paper, two kinds of new fulgide materials, like pyrrylfulgide/PMMA film and 3-indoly-benzylfulgimide/PMMA film are used as storage materials. Different kinds of optical storage properties, like photosensitive spectral range, light sensitivity, resolution, fatigue resistance and thermal stability of them are measured. The experimental results show that for pyrrylfulgide and 3-indoly-benzylfulgimide, their photosensitive spectral range were 500nm~780nm and 480nm~720nm respectively; their maximum absorption were at 626nm and 573nm respectively; under 633nm light excitation, their light reaction constants of bleaching process on the exciting light polarization direction were 1.4×10-3cm2/mJ and 2.89×10-3cm2/mJ respectively; their resolution were both higher than 1680 lines/mm; they can be recycled more than 33 times and 70 times respectively; at room temperature they can be stored for 12 months and 14 months respectively. And it is concluded that pyrrylfulgide and 3-indoly-benzylfulgimide show better application potential in the field of rewriteable optical storage.
Study of the Electrical Contact Properties of Monolayer MoS2/Si Heterojunction
Authors: Ma Xi Ying , Shi Miao Yuan
Published: March 2013

We present the study of the electrical contact properties of monolayer MoS2/Si in terms of semiconductor heterojunctions theory. It shows that the carrier concentration increases in exponential form with temperature, then gradually arrived to its saturation. Additionally, the energy band structures of monolayer MoS2/n, p-Si heterojunctions have been developed before and after contacting. And the work functions of MoS2 and Si, barrier height of the junctions have been investigated. The barrier height linearly increases with the carrier density in Si. Finally, we simulated the voltage-current property of the monolayer MoS2 /n, p-Si heterojunctions in terms of thermal diffused theory of semiconductor.
The Research of Iron-Steel Production Physical Distribution Technology Economic for Our Country
Authors: Xia Wen Hui , Zeng Hong , Geng Jin
Published: March 2013

This article has discussed the energy saving in iron-steel industry in our country, faced to typical special of the production logistics process in iron-steel enterprise, improved the physical distribution model of the production logistics process in iron-steel enterprise, designed it’s key-points that is possible arranging dispatching routing, then according to most in-out domestic specialist establishes the logistics model that has time window constraint and can be visited many times by customers. Needed to its. Through the simulation case, it indicated that the distribution cost of the model which can be visited many times is less than that of witch can’t be visited many times. Arrived at the less cost and most efficient, it is an important value that theoretical and practice.
Experiment on Flexural Behavior of Bridge Structure Reinforced with a Novel FRP Material Based on Scale Model
Authors: Lai Yi , Yi Han Bin , Jiang Xiang Lin
Published: March 2013

: Taken a reinforced concrete beam bridge which has 20 m main span as an example，based on similarity theory，9 scale model beams of T-beam were designed in accordance with CL= 1/4. The test was divided into three groups: test I: contrast beams without reinforcement，test II: reinforced beams without considering the secondary load，and test III: reinforced beams considering the secondary load. The ultimate load，crack propagation，strain of basalt fiber reinforced polymer (a novel FRP material) sheet and the ultimate failure mode of the beams reinforced by BFRP sheet in the cases of test II and test III discussed. By comparing the results of three tests，it shows that (1) the average deflections of test II and test III decreased by 36.7% and28.9% respectively than that of test I; (2) the final average strains of BFRP sheet in test II and test III are 15118 με and 10921 με which are 84. 4% and 61. 0% of the ultimate tensile strain of BFRP sheet respectively，indicating the stiffness of beams is increased after reinforced by BFRP sheet and the reinforcement effect of test II is better than that of test III; (3) all the ultimate failure mode of reinforced beams are brittle failure.
Study on a Torque Sensor Based on Nanocrystalline Alloys
Authors: Shi Yan Ping , Hou Jin Zhu
Published: March 2013

In order to solve some problem of torque measuring for automatically controlled system, a new non-contact torque sensor based on the amorphous alloy was discussed in the paper. At first the principle and structure of the sensor were presented .then output characteristic, sensitivity and the non-linear error of the sensor were analyzed. Finally, an experiment of measuring torque was made on a test stand. The experimental result shows the sensors have some characteristic such as higher sensitivity and simpler structure and is convenient for installation.
Quick Lime Modification and Coagulation Performance of Nano-Inorganic Polymer Coagulants from Oil Shale Ash
Authors: Sun Tong , Liu Lian Li , Wang Li Li , Xu Shu Ying
Published: March 2013

The nano-inorganic polymer coagulant, poly-ferric-aluminum-silicate-sulfate (PFASS) modified by quick lime were prepared from oil shale ash, which were evaluated by treating sewage. The following results are discovered: The samples contain (CaO)xSiO2•zH2O, Fe2(SO4)2(OH)•5(H2O), NaAl(SO4)2•(H2O)6 and other crystal; PFASS are complicated compounds by iron, aluminum, silicon and other ions rather than simple mixtures of raw materials. The optimal coagulant dosage is about 80-100 mg/L for the turbidity removal, and the range of the suitable dose is wider for COD removal, the optimal dose of quick lime is 2.5 g for turbidity removal and 3 g for COD removal.
Carbothermal Synthesis of Cr3C2-WC-Ni Nanocomposite Powders
Authors: Jin Yong Zhong , Ye Fa Ming , Zeng Xian Guang , Yang Rui Song
Published: March 2013

Cr3C2-WC-Ni nanocomposite powders with ~50-100 nm were synthesized from precursors by vacuum-aided carbothermal reduction at only 750 °C for 2 h. The phase composition and microstructure of the synthesized products were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The present study shows that Cr3C2-WC-Ni nanocomposite powders contain two kinds of solid-solution phases, namely Ni and (Cr, W)3C2solid solution, respectively. WC and W2C phases do not appear inreaction products due to the dissolution of tungsten atoms into Ni and Cr3C2unit cells. Especially, there is a change of the crystalline structure for (Cr, W)3C2phase from 750 °C to 800 °C.
Facile Synthesis of Nicore - Agshell Bimetallic Nano Particles for Conductive Paste
Authors: Li Wen Hua , Xie Ji Min , Jing Jun Jie , Qin Hui Ru , Zhang Ming Mei , Xian Yu Jia
Published: March 2013

Ni-Ag core-shell nano particles have been facilely prepared by redox-transmetalation reaction of silver ions on the surface of nickle nano particles. As characterized by transmission electron microscopy (TEM), the as-synthesized core-shell particles were mono-dispersed and exhibited a narrow size distribution ranging from 200nm to 300nm. XRD analyses indicated both Ni core and Ag shell had an fcc structure. Furthermore, the thickness of silver shell was controllable via changing the mole ratio of Ag to Ni, which could show benefits for potential applications in optical, catalytic and electronic fields.
Application of the Nanocrystalline Alloy in Lubrication Oil Pressure-Measuring for Auto Engines
Authors: Shi Yan Ping , Fan Shu Hua
Published: March 2013

A novel measuring method based on Fe-based nanocrystalline alloy was studied to achieve accurate measurement of the lubrication oil pressure of auto engines. A magnetoelastic inductance pressure sensor was designed. Its operating principle, structure, output characteristics, and major parameters were discussed. The static characteristics of the sensor as well as its temperature, excitation circuit intensity, and influence on output frequency were analyzed through an experiment. Results show that the sensor is stable and reliable at high temperatures, and it has a simple structure. It can efficiently measure the lubrication oil pressure of auto engines.
Design of Stealthy Devices Made of Metamaterials with Material Properties
Authors: Liu Ye , Li Zhu Ying , Zhang Wang Zhou , Sun Yu Hong
Published: March 2013

Using the method of electromagnetic coordinate transformation, through determination of the relation of permittivity and permeability distribution in different spaces, the forming condition of electromagnetic stealthy cloak made of metamaterial is discussed. On the specific distribution of permittivity and permeability, finite element method is used to analyze the electromagnetic characteristics of stealthy cloak which is radiated by plane electromagnetic wave. And the cloak shows excellent stealthy characteristic in theory at certain frequency of the wave. The result shows that the artificial metamterials, which are not found in nature, have the ability of controlling the electromagnetic field and changing the transmission path of wave. Besides stealthy cloak, new electromagnetic devices such as transparent device and concentrator, which are made of metamaterials designed by the coordinate transformation, are preliminarily discussed. They all have excellent stealthy characteristics.
Elastic-Plastic Analysis on Interaction between Roadway Surrounding Rock and Supporting Structure
Authors: Liang Xu Li , Wang Fei , Hao Gang Li
Published: March 2013

The interaction between tunnel surrounding rock and supporting structure has been deeply analyzed by using elastic-plastic theory, and the higher strength and durability of supporting structure made by selecting reasonable supporting structure and adopting high strength concrete as material has been proved.
Wet Etching of Aluminum Periodic Patterns in Micrometer-Scale
Authors: Du Jia Qiang , Liu Huan , Liu Wei Guo
Published: March 2013

In the process of deep etching of silicon, the metal film or the oxide film served as silicon protective layer needed to be etched before using plasma etching technology. In order to solve the etch rates variance of different aperture sizes and different pitchs periodic patterns, by controlling the water bath temperature and etching time, the etch rates of different aperture sizes and different pitchs periodic patterns at 50 degree centigrade had been developed. Also we contrasted the etching results at different bath temperatures and got the controllable and suitable wet etching bath temperature 50 degree centigrade. At last, the paper further explores the effects of feature size and the wet etching bath temperature on etch rate.
Molecular Dynamics Simulation of Nanoscale Contact Process of Plane on Plane
Authors: Yang Xiao Jing , Yang Xiao Jiang
Published: March 2013

Considering the process of the plane of rectangular indenter contacting on the plane of rectangular basal body in nanoscale as research object, molecular dynamics method is used for modeling, solving and simulation analysis. The change of atomic state and acting force in the contact process of nanoscale plane and plane is analysis from atomic aspect. The result showed that: when the plane of the rectangular indenter is from the surface of the base body a certain distance, due to attractive force, produced by inter-atomic force, the surface of the substrate produces atoms projection phenomenon; As the indenter continue to move down,the inter-atomic force becomes repulsive force, generates the contact pressure which gradually increases as the contact depth increases; The lattice under the indenter is deformed with pressure action. When indenter is in disengagement stage, the contact pressure decreases rapidly, and appears to reverse tensile stress. With action of the reverse tensile stress, dislocation configuration gradually change and restructuring. At same time, due to the surface effect, a number of substrate atoms are adsorbed in the surface of indenter, which caused by adhesion,and pulled out of the base body with the indenter.