bluuebunny/crossref_metadata_2025 huggingface dataset:
Thermal Error Modeling of a CNC Machine Tool
Authors: Mao Chong Zhi , Guo Qian Jian
Published: March 2013

The purpose of this research is to improve the machining accuracy of a CNC machine tool through thermal error modeling and compensation. In this paper, a thermal error model based on back propagation networks (BPN) is presented, and the compensation is fulfilled. The results show that the BPN model improves the prediction accuracy of thermal errors on the CNC machine tool, and the thermal drift has been reduced from 15 to 5 after compensation.
Simulation on the Dynamic Characteristics of an Electromagnetic Relief Valve with High Pressure and Large Flow Rate
Authors: Liu Xiang Lin , He Xiao Feng , Luo Long Jun , Luo Xiao Hui
Published: March 2013

The use of electromagnetic relief valve with high pressure and large flow rate in hydraulic system is usually easy to bring vibration and noise issues, especially while water or high water based fluid (HWBF) is used as the fluid medium. In this paper, a HWBF electromagnetic relief valve with a cushion valve was presented and its simulation model was built based on AMESim software. Through simulation, it is found that the cushion valve can significantly reduce the peak pressure gradient of the electromagnetic relief valve during unloading process compared with that without a cushion valve. This research provides a new solution for solving the vibration and noise issues of a hydraulic system with electromagnetic relief valve.
The Characteristics of ESD Protection Device Based on Static Induction Thyristors
Authors: Yang Jian Hong , Zhang Lin Jiao , Zhao Fei Hu
Published: March 2013

A novel structure of ESD protection device based on the static induction thyristors (SITh) was in further investigation. Detailed analysis of the negative resistance characteristics of SITh was presented, especially its blocking and conducting states that satisfy the requirements in ESD events. The characteristics of SITh for ESD protection were obtained using the Time Domain Reflectometer (TDR) type of Transmission Line Pulse (TLP) testing system. The results illustrate that SITh for ESD protection has the following advantages: 1) It has a strong ESD stress handing capability (3.75 kV); 2) Its second breakdown current is large enough (2.5 A) to release great ESD current; 3) DC leakage current of SITh is very small (1 μA); 4) SITh can break through the limitations of transitional trigger voltages, whose trigger voltage is dynamically adjustable as well; 5) The ESD response time can be controlled through optimizing device structure of SITh.
Analysis and Detection of OVERHAUSER Magnetometer Signal
Authors: Zheng Dian Dong , Wang Yi , Jiao Yang , Wang Jun , Zhao Yue
Published: March 2013

Studied the OVERHAUSER magnetometer signal's production mechanism and instrument's working principle, designed high frequency energizer, DC polarization circuit and signal detecting circuit. Detecting circuit was composed of the analog frequency selective amplification, narrow-band filter, programmable amplifier and controller. In setting conditions, the probe output Larmor precession signal, then collected the signal by the detecting circuit. The results show the single identified with the theoretical analysis with a higher SNR. Provided an important basis for the increase of the system sampling rate by analysising the relationship between the poling time and the output signals amplitude.
A Preamplifier-Latch Comparator with Reduced Delay Time for High Accuracy Switched-Capacitor Pipelined ADC
Authors: Wu Jin Rong , Ju Ying , Lin Zhi Lun , Lin Chu Lian , Li Xiao Chao
Published: March 2013

This paper presents a modified preamplifier-latch comparator for minimum latch delay and minimum input referred noise. The ratio of PMOS/NMOS in cross-coupled inverter is verified theoretically and optimized for minimum comparator delay. The cross-coupled load, the cascaded structure and the capacitor neutralization techniques are adopted to reduce the kickback noise and the input referred offset voltage. The comparator circuit is designed in a TSMC 0.35 um/3.3 V 2P4M CMOS process. Simulations show that the delay time of latch is declined by 18 percent after optimization and the maximum transfer delay time is only 384.5 ps. The peak to peak value of kickback noise is only 0.831uV in case of Vin,max=1.25 V, and the Monte Carlo simulation results show that equivalent input referred offset voltage is 4.56mV.
An Improved SPICE Macromodel of Memristor for General Applications
Authors: Liu Guo Hua , Wang Guang Yi
Published: March 2013

This paper introduces an improved SPICE model of memristor using dependent sources and switches. The proposed SPICE model with two parameters in dependent current source has ideal frequency and amplitude characteristics. We simulate two circuits with memristor. The results demonstrate that the memristor can “remember” last resistance value when no current passes through it, the Amplitude Modulation (AM) circuit with memristor and op-amp is simulated under the condition of high frequency. Since the memristor has great performance in frequency there might be a possible application of the memristor to be used as modulator or demodulator in wireless communication.
Analysis of Microstrip Filter Circuit Based on Network Port Model of MOM
Authors: Sun Hong Wei , Wang Xiao Chun
Published: March 2013

By combining the method of moment (MoM) and the method of network analysis, we analyze the microstrip filter circuits. First, we deduce and calculate the closed form multilayered Green’s function by using the discrete complex image method. Then, we apply the multilayered Green’s function into the method of moment (MoM) and by using the multi-port network theory, we get the networks parameters. At last, the numerical result proves the method’s accuracy and validity.
Dynamic Resource Allocation for Compressive-Sensing-Based Wireless Visual Sensor Networks with Energy Harvesting
Authors: You Lei , Su Xin , Han Yu Tong
Published: March 2013

Wireless visual sensor network (WVSN) is emerging with many potential applications. The lifetime of a WVSN is seriously dependent on the energy shored in the battery of its sensor nodes as well as the adopted compression and resource allocation scheme. In this paper, we use the energy harvesting to provide almost perpetual operation of the networks and compressed-sensing-based encoding to decrease the power consumption of acquiring visual information at the front-end sensors. We propose a dynamic algorithm to jointly allocate power for both compressive-sensing-based visual information acquisition and data transmission, as well as the available bandwidth under energy harvesting and stability constraints. A virtual energy queue is introduced to control the resource allocation and the measurement rate in each time slot. The algorithm can guarantee the stability of the visual data queues in all sensors and achieve near-optimal performance.
Thermal Resistance Analysis and Simulation of IGBT Module with High Power Density
Authors: Wu Yi Bo , Liu Guo You , Xu Ning Hua , Dou Ze Chun
Published: March 2013

As the IGBT power modules have promising potentials in the application of the field of traction or new energy, the higher power density and higher current rating of the IGBT module become more and more attractive. Thermal resistance is one of the most important characteristics in the application of power semiconductor module. A new 1500A/3300V IGBT module in traction application is developed successfully by Zhuzhou CSR Times Electric Co., Ltd (Lincoln). Thermal resistance management of this IGBT module with high power density is performed in this paper. Based on thermal nodes network, an equivalent circuit model for thermal resistance of power module is highlighted from which the steady state thermal resistance can be optimized by theoretical analysis. Furthermore, thermal numerical simulation of 1500A/3300V IGBT module is accomplished by means of finite element model (FEM). Finally, the thermal equivalent model of the IGBT module is verified by simulation results.
Integral Type Multi-Ramp for Single-Slope ADC
Authors: Lyu Nan , Yu Ning Mei , Zhang He Jiu
Published: March 2013

This paper presents a integral type Multi-ramp architecture apply to MRSS ADC (Multiple-ramp single-slope ADC).On the one hand to improve the capacitance mismatch by change voltage reference, On the other hand to reduced the power consumption greatly. Implemented in the GSMC 180nm 2P4M CMOS process, in the power supply voltage of 1.8 V, 11-bit resolution, 10 MHZ sampling frequency, the result of max power consumption is 1.33mW of single unit .The DNL < 0.1LSB and max INL < 0.49LSB .The Multi-ramp achieved requirements for high speed and high accuracy MRSS ADC.
Research on Overvoltage of Parallel Capacitors in 500kv Substation and its Protection Parameters
Authors: Zhang Xing Hai , Zhang Bo Wen , Han Wei Feng , Sun Ji Xing , Wu Guang Ning , Gao Guo Qiang
Published: March 2013

In order to make it clear for explosion accidents of parallel capacitors occurred in 500kV substations in Sichuan power network one after another, the authors calculate and analyze the distribution of overvoltage caused by breakdown of elements within the capacitor bank. Dissecting the insulation of faulty capacitors, severe ageing of insulation is discovered; this phenomenon proves that the overvoltage on partial element should be the main factor influencing the insulating performance of capacitors. To ensure the reliable operation of parallel capacitors the setting value of unbalanced current protection at the neutral point of double star connection is modified by the calculated value of unbalanced current of 35kV capacitor bank in which there are six parallel groups of capacitors and in each group seven capacitors are connected in series.
FPGA Implement of Multi-Channel Real-Time Correlation Processing System
Authors: Liu Xin , Sun Da Jun , Teng Ting Ting , Tian Yuan
Published: March 2013

The traditional real-time correlation processing system in FPGA is implemented in parallel mode. It has disadvantages such as high FPGA resource-consuming, low efficiency and poor flexibility. A time-multiplexed processing architecture takes NIOS processor as system controller, connected with preprocessing module, sliding-correlation processor and memories by Avalon data bus. The transmission of large data block out of sliding-correlation processor employs DMA method for its controlling flexibility, the data transmission between computing units and memory units within the processor employs directly memory access to minimum time delay.
The Design of 3G Wireless Network Video Acquisition System Based on the DM6446
Authors: Chen Long Hu , Li Zhen Yu , Tang Zhi Wei , Li Wan Cai
Published: March 2013

The 3G wireless network video acquisition system based on the DM6446 is designed, which ARM side of DM6446 complete the main control functions of the system, then it calls H.264 video compression algorithm in DSP side of DM6446 through the Codec Engine, which greatly improves the efficiency of the system, and the RTP protocol control data transmission in the CDMA2000 network. The monitoring display terminal gets video resource by accessing the corresponding IP address. The experimental results show that the system designed completes wireless network video acquisition task safety and reliably, and the image is clear, also the video is coherent.
Study on Strategies of Campus Network Security
Authors: Xu Zhao
Published: March 2013

Higher education institutions have a moral as well as legal responsibility to protect the sensitive data maintained on campus computers. Higher education institutions are beginning to look at areas to improve the protection of their information technology structure due to the increase of viruses, spam, hackers, and identity theft. The main goal of this paper is to study network security in university. The result shows the genuine exposure, the risk of being effectively compromised is real. Consequently, this network trap should be closely monitored and data control mechanisms, such as a reverse firewall, should be configured to prevent an attacker from using the network trap to damage other production resources.
The Research about Fast Re-Authentication Technology Based Mobility Model
Authors: Xu Guo Jun , Liu Fang , Wan Chang Sheng
Published: March 2013

In accordance with the existing problems in the process of fast re-authentication, tabled a fast re-authentication scheme based on the mobility model and dynamic network access identification (DNAI), also simulated and analyzed of the performance of both existing programs and new programs. Research shows that the scheme can greatly increase the switching re-authentication performance of the outer area, and resolve the privacy problem of the mobile terminal position.
Study on Indoor 2D-OCDMA VLC System
Authors: Wu Xue Ying , Meng Ying , Liu Peng
Published: March 2013

We propose visible light communication 2D-OCDMA system for indoor communication. We first discuss about the system model, and also discuss about the construct of 2D-OOC code with 2-D OCDMA VLC system and 2-D OCDMA VLC with MWOOC. Compare it with 1D OOC. And we also give some analysis the capacity of 2D-OCDMA in VLC. From the analysis the structure of the 2D-OCDMA is complicated but using 2D-OCDMA can enhance the capacity of the system in the room. More work should be done in the future on this research.
Design of Continuous Indoor Navigation System Based on INS and Wifi
Authors: Hu Yi , Sheng Lei , Zhang Shan Jun
Published: March 2013

The application of navigation, such as guidance of pedestrians, requires a certain accuracy of continuous outdoor and indoor positioning. In outdoor environments GPS system has proved to be effective. However in indoor it is challenging to control the accuracy within 2 to 3 meters. At present several approaches have been developed for indoor positioning, such as RFID. But they are mainly been implemented in professional areas, for general user such as tourists and visual incapable users it is difficult to take advantage of these technologies because of the high price of terminal and the navigation service covered area is extremely limited. In this paper, a new approach of indoor navigation method is proposed to solve the problems of traditional methods. It is based on INS and wifi positioning technology. As hardware, wifi receiver, smart phone built-in accelerometer and digital compass are selected and investigated. User’s indoor position is first estimated by dead reckoning method with INS navigation system and then be recalibrated by wifi position information. Several experiments performed in the test verified the effectiveness of this indoor continuous positioning method described in this paper.
An Improved Centralized 2PC Protocol
Authors: Qi Can , Zou Guo Xia
Published: March 2013

Centralized 2PC protocol is inefficiency when there is an unilateral cancel. The coordinator must wait for the messages of all participators, although there is a unilateral enable. In this case, Centralized 2PC wastes a lot of resource, such as time and network. The improved centralized 2PC protocol will make a decision of cancel and send to other participators as soon as there is an unilateral enable.
Construction of Knowledge Map of the Medical Literature Based on SOM Algorithm
Authors: Ma Qing Yun , Wang Yong , Wang Ying
Published: March 2013

In today's knowledge economy era, knowledge has become an important resource for social development. How to effectively manage knowledge has become the contemporary an important research direction. Medical Literature is the main carrier of medical knowledge, how to make good use of medical literature to become the key to the development of Chinese medicine. Although there are large numbers of medical literature, but penetrates its content to be actually irregular, the literature data lacks has the systematic analysis to make uniform, so that the application value relative reduces largely. Knowledge map as a timely, efficient, and visual knowledge navigation and management tools will be introduced to the medical information service management system, the urgent need to improve the level of medical information, the development of new drugs. In this paper, the use of the SOM algorithm knowledge mapping the pharmaceutical literature, it mainly includes single literature knowledge map generation and extensive literature knowledge map generated. First uses the GHSOM algorithm construction single literature the knowledge map, then by the ESOM algorithm, the single literature knowledge map integration with other knowledge map, finally there will produce the global knowledge map.
Principle, Framework and Application of Internet of Things
Authors: Li Tong
Published: March 2013

“Internet of things” (IOT) is a very new concept created and developed in recent years. It had not been paid front attention until one or two years ago, when Chinese and US leaders announced emphasis on the development of IOT. To recover global economy under the economic and monetary crisis background, innovative technologies such as IOT are critical to create new economic development growth points. This paper first introduces the concept and origin of IOT, then describes basic principles of IOT, next illustrates the framework of IOT, and finally takes two examples to suggest applications of IOT. The paper intends to help readers recognize IOT as a whole, to hold the clue and venation of the development of IOT, and to forecast future trends of IOT development.
Research and Application of Mass Storage System (MSS) in University Hybrid Libraries
Authors: Tang Kai
Published: March 2013

Hybrid library is the basic orientation of the present development library. Along with the fast growth of digitalized resources, it is extremely essential to set up a storage system which can meet the need of visiting mass storage and sharing backups. Based on the comparison of the main features of three storage systems (DAS, NAS and SAN) in terms of its notion of designing, connection protocol, style of management and its security, this paper focuses on the situation of the application of centralized management of data mainly constructed on the basis of SAN, tiered storage, as well as the storage system with good safety and strong extensibility in North China Institute of Science & Technology(NCIST).
Three-Dimensional Distribution Operation Simulation Training System
Authors: Lu Xiao Hong , Zhang Qiu Shi , Zhang Xue Feng , Rui Zhang
Published: March 2013

The training of distribution operators is an important link to ensure the safe operation to effectively enhance the training effect,the paper put forward a new teaching form that combining the line operation and simulation training. It firstly analyzes the distribution network simulation training function demand, then designs training simulation system structure,extracts simulation training process,introduces the key technology:three-dimensional simulation technology,then simulation training process,finally gives the system development example. The application result shows the power line operation simulation training system can effectively guarantee the operation training effect,has a great practical significance.
Robust Curvature Estimation on Scattered Point Cloud
Authors: Zhang Fan , Kang Bao Sheng , Zhao Jian Dong
Published: March 2013

A robust statistics approach to curvature estimation on scattered point cloud is presented. The basic idea of this method is fitting a surface to the local shape at a sample point in 3D and the curvatures are computed for this fitted surface. Within a Maximum Kernel Density Estimator framework, the best fitted surface for each point is obtained. Therefore the algorithm is robust with respect to noise and outliers. Experiments show that our method has achieved satisfactory results.
The Pose of Data Model and Research Based on Analysis of Intelligent Test Paper
Authors: Fang Cai Li , Wu Lin
Published: March 2013

As a important part of teaching, Traditional paper analysis algorithm is complicated and not comprehensive enough. This paper according to the indicators of education measurement and improves the traditional calculation models, the system assesses the perfect calculation model, The teacher also can get the true and fast reaction to students' knowledge and the quality of the paper. This method thereby provides a convincing basis for the improvement on the future teaching and increase the effectiveness in teaching
A New Scheme on XOR Operation for Low-Cost RFID
Authors: Li Ming , Dai Zhao Peng , Xi Fang
Published: March 2013

In order to overcome the high complexity of the tag in RFID, a new XOR scheme is proposed based on the relationship between X and Z for X XOR (X + On) =Z. As only XOR and random number generator are required to be computed by tags，it is very suitable for low—cost Radio Frequency Identification(RFID) system .
A GIS Based Assistant Information System for Forest Fire Prevention Direction
Authors: Yu Xin Wen , Zhang Wen Ge , Yang Yan Chen , Lei Zhen Yu , Zhang Xu
Published: March 2013

Forest fire is one of the most detrimental factors affecting forest resources. Forest fire prevention and suppression requires a lot of information of fire field in decision making. A GIS based assistant information system for forest fire prevention direction was developed. The system makes use of spatial data and fire monitoring data from sensor nodes to provide important assistant information for forest fire prevention. It also provides a series of Web service APIs for forest fire prevention application development. Test demonstrated that the system is applicable and helpful to forest fire prevention.
A Method of Geospatial Data Files Conversion Based on Semantic
Authors: He Ming Xiang , Li Guan , Lu Xin Ming
Published: March 2013

Data conversion is a necessary step to establish a unified data storage and management mode. Based on the analysis of the structure of Shapefile and the principle of semantic conversion, this paper proposes a method of geospatial data files conversion based on semantic. This method to a relational database file shape file conversion, the application of this method can not only increase the data read speed, and ease of data management and sharing.
Micro-ANP：A Novel Network Protocol Architecture for Underwater Sensor Network
Authors: Du Xiu Juan , Huang Ke Jun , Liu Fan , Feng Zhen Xing , Lan Sheng Lin
Published: March 2013

Underwater sensor network (UWSN) adopts acoustic communication and is characterized by high delay, low bandwidth, high error rate, low energy-consumption requirement and sparse topology, which lead to conventional network protocols for terrestrial WSN or other wireless multi-hop networks are unable to satisfy the performance of UWSN. On the other hand, the limited resources of energy, CPU and memory cause that the protocol stack running on the sensor node shouldn’t be much complicated. The paper proposes a novel, green network protocol architecture model tailored for UWSN, referred to as Micro-ANP, which is three layered structure including application, network transport, and physical layer. Furthermore, basing on Micro-ANP we realize the packet size optimization of UWSN through Matlab simulation. Micro-ANP protocol architecture and packet size optimization improve the energy efficiency of UWSN, prolong the network lifetime and achieve green network while meeting the requirement of QoS with the constraints of limited resource.
Development of a Human-Machine Interaction Software in Borehole-to-Surface Electromagnetic Transmission System
Authors: Chen Guang Yuan , Deng Ming , Jin Sheng , Wang Meng , Wu Kai
Published: March 2013

Human-machine Interaction (HMI) system plays a crucial role in borehole-to-surface electromagnetic surveys. In electromagnetic transmission system, real-time monitoring ability about transmitted parameters and states has benefit to prospect accuracy and efficiency improvement. The aim of this study is to develop a HMI software applied to borehole-to-surface electromagnetic transmission system. The HMI software programmed by C language controls transmission system to achieve several main functions, such as frequency transmission, transmission mode alteration, GPS time adjustment, RTC time display and battery power monitoring. From 2009 to 2010, there are four prospecting experiments did for this software. One is in the indoor laboratory, and the others are on the different mineral districts.
Rapid Reconstruct 3D Building Models from Point Cloud
Authors: Luo Dean , Liao Li Qiong
Published: March 2013

Present a semi-automatic method to rapid reconstruct 3D building models from point cloud based on building semantic objects, its symmetric and repeated properties, introduce its basic theory and detailed work flow. Experiment investigation shows that the method is more efficient and more productivity than existing reconstructing methods.
CPS Design about Container Freight Management System
Authors: Xu Fang Qin , Yu Xi , Liu Jin Gao
Published: March 2013

These years, rapid developments of Internet of Things provide powerful motivation to container freight. As the current situation, Framework of Container system and its basic infrastructure are all in starting stage, unanimous standard and hardware support are two obstructions for it. Considering that Container system will provide profound influences to Chinese market, the authors mainly design a CPS architecture of Container Management system and transplant software parts to Cloud computing platform. After that, the new container system will fully take advantage of Internet and reduce reliance toward computer’s hardware. After utilizing distributed software of Cloud servers, the management system will become much more efficient, providing a better service platform for consumers.
Implementation of Parallel Lanczos Method for Intrusion Detection with Cloud Technologies
Authors: Chen Bo , Deng Yu Le , Chen Tie Ming
Published: March 2013

The aim of dimensionality reduction is to construct a low-dimensional representation of high dimensional input data in such a way, that important parts of the structure of the input data are preserved. This paper proposes to apply the dimensionality reduction to intrusion detection data based on the parallel Lanczos-SVD (PLSVD) with the cloud technologies. The massive input data is stored on distribution files system, like HDFS. And the Map/Reduce method is used for the parallel analysis on many cluster nodes. Our experiment results show that, compared with the PCA algorithm, PLSVD algorithm has better scalability and flexibility.
A New Key Management Protocol for Multiphase Hierarchical Wireless Sensor Network
Authors: Bai En Jian , Wu Liang Cheng
Published: March 2013

In the LEAP (Localized Encryption and Authentication Protocol), disclosure of the initial key will threaten the security of the entire network. B.Tian and his fellows improved the LEAP and diminished the threat. They reduced the number of exposed communication keys resulted from the disclosure of the initial key. In this paper, we show the deficiency of the improved protocol put forward by B.Tian et al and propose a new key management protocol for multiphase hierarchical WSN (NPMHW) . NPMHW designs a special method to establish the key ring by using random numbers and the HASH function. It also introduces a mechanism to detect whether the node is captured or not. Analysis indicates that, compared with B.Tian’s protocol, NPMHW localized the threat and greatly reduced the number of the exposed communication keys caused by the disclosure of the initial key. Therefore, the protocol raised in this paper is much safer.
Transplant and Tailor of gSOAP Based on Embedded Linux
Authors: Wang Lei , Zhu Shi Wei , Yu Jun Feng
Published: March 2013

In this paper, an open source web service software—gSOAP which is transplanted to the embedded Linux is proposed. Web service is not only an application entity for building applications, but also a distributed applications platform which runs operations interoperably. It can also execute all kinds of operating systems (OS) which support HTTP protocol. With the rapid development of the embedded system, lots of open-source software is transplanted to the embedded platform by embedded operating systems.
FeSiAl Powder Core Coated by Ba-B-P-O System Insulating Layer
Authors: Wei Ding , Wang Xin , Feng Z K , Gong R Z
Published: March 2013

Sendust soft magnetic composites coated by a thin Ba-B-P-O system insulating layer were produced; SEM spectroscopy and Energy dispersive X-ray analysis spectroscopy confirmed that thin layers of Ba-B-P-O system covered the alloy powders. The influence of various compaction pressures on composites permeability, DC properties and total loss was investigated. The Fe-Si-Al magnetic powder core with compaction pressure of 1932MPa, annealing temperature of 953K with a permeability of 94, a total loss of 108 mW/cm3.
Effects of Annealing Treatment on the Microstructure and Mechanical Properties of Magnesium Alloy Sheets
Authors: Wang Lei , Min Guang Hui , Gao Pan Pan , Wang Xin Ying , Yu Hua Shun , Cui Hong Wei
Published: March 2013

The microstructure of magnesium alloy sheets (nominal composition Mg–6Zn–Y in at. %) was investigated with the Optical Microscope (OM), Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) technique after the annealing treatment. Tensile test at room temperature was performed to show the influence of annealing treatment on mechanical properties. Experimental results indicate that there are a large number of twin crystals appearing in microstructure of the extruded Mg-Zn-Y alloy sheet at 350 °C. The distinct icosahedral phase appears on the α-Mg matrix in granular form and the strength gets largely improved to the maximum. The uniform distribution of isometric crystal contributes to the best elongation at the annealing temperature of 400 °C.
Study on Microscopic Structure and Mineral Composition of Shallow Rock Using SEM
Authors: Zhang Ming , Ning Jian Guo , Zhang Hong Bin , Liu Xue Sheng
Published: March 2013

Microscopic structure and mineral composition of shallow rock in different geological group were detect using scanning electron microscopy technology, and the influence of microscopic structure and mineral composition on macro-mechanical properties was analyzed. The results showed that: from the surface to the coal seam: sandy mudstone particle surface banded, non-directional distribution into flake orientation distribution point - point contact - surface contact into contact between particles, resulting in the rock mass more easily broken, the breaking the block becomes small; the sandy mudstone particle volume decreases, the smaller the gap between the particles, and by filling into velvet spherical aggregates filling, resulting in increased contact area in the rock mass fracture; sandy shale montmorillonite content increases, the rock mass in the water particle volume expansion, extrusion intergranular pore, reduce pore channel, the rock mass macroscopic pass water to reduce.
Optimization and Selection of Solid Fuel Type in Sintering Process
Authors: Song Chun Yan , Gui Yong Liang , Hu Bin Sheng , Li Quan Hui
Published: March 2013

In order to use resonably fuel resources and reduce cost of manufacture, the effects of coke and coal powder on chemical coposition and metallurgical properties of sinter were studied with the iron ore blender as the iron-contained materials. Results shown that the reducibility at 900°C was slightly improved and the low temperature reduction degradation index was worsened with the coke powder as the solid fuel relative to coal powder under the equal calorific value condition. However, with the increasing of solid fuel ratio, the mechanical strength and low temperature reduction degradation index was improved.
Test to Fly Ash Recycled Concrete under Different Water Cement Ratio
Authors: Chen Ming Zheng , Liu Xian Feng , Huang Lin Qing
Published: March 2013

The recovery and utilization to building solid waste is the current hot issues in the construction of towns. In this paper, 30 groups of fly ash recycled concrete test cube were designed and produced, through the mechanical performance test research, we analysised the main influence factors to the strength and performances of fly ash regeneration concrete test cube,such as recycled aggregate category, water cement ratio, the admix proportion of recycled aggregate. The test results would lay a solid foundation for the test research and engineering application of recycled concrete.
Dynamic Testing at High Strain Rates of AZ31 Magnesium Alloys on SHPB Equipment
Authors: Chang Xu Qing , Ma Tie Hua
Published: March 2013

The mechanical behaviour of as-cast AZ31 Mg alloy has been investigated at strain rates up to 2.0×103s-1. Dynamic tests were carried out at room temperature using a Split Hopkinson Pressure Bar (SHPB) apparatus. Microstructural characteristic were analysed by Image MAT A1 optical microscopy. The results demonstrated that AZ31 Mg alloy exhibited obvious yield phenomena and strain hardening behaviour at high strain rates. The basically same curvature of stress-strain curves exhibited an similar strain hardening rate. The dynamic yield strength changes little and the peak stress increases with the strain rates. An examination by optical microscopy after high strain rate deformation reveals the occurrence of twinning and twin area percentage increases with the strain rate increasing.
Nonlinear Wave Mathematical Model and its Application in Permeable Breakwater Harbor
Authors: Cao Hong Sheng , Pan Xi Shan , Li Chun Hui , Kong Cong Ying , Zhang Wei Yi
Published: March 2013

Non-linear wave influence is considered in the elliptic mild-slope equation including higher-order terms of water depth, and a non-linear wave mathematical model is derived in which reflection and transmission boundary conditions are involved based on Behrent radiation boundary condition. The model was verified with data obtained from experiment of elliptic shoal topography, and numerical simulation result accord with experiment value well. The model is applied to simulate waves in a permeable breakwater harbor and a sound wave height distribution in the harbor is obtained, can reflect reflection and transmission of the boundary impact on wave condition in the harbor well.
The Analysis of Structural Strength of UD Clutch Hub Assembly
Authors: Liu Xin Tian , Wang Yan Song , Zhao Li Hui , Xing Yan Feng , Guo Hui
Published: March 2013

Firstly, FEA model is established to analyze strucural strength of clutch hub assembly according to the company standard and test requirements document. And then the result of FEA is obtained. During strucural strength test of clutch hub assembly, five test pieces are chosen. Bench test of it is finished with principle of work. The failure mode of all test pieces happens at welding line between clutch hub and inner tower. After the results of FEA and bench test are studied, the conclusion can be reached that simulation curves are similar to test curves. Finally the clutch hub supplies the demand of design.
Influence of Internal Resistance on Temperature Rising of Cylindrical Ni-MH Batteries
Authors: Li Mao De , Li Yi , Wei Wei
Published: March 2013

The internal resistance of the six Ni-MH batteries are obtained by experiment, furthermore get resistance curve using polynomial fitting method. This article commits itself to take the variation of the operating conditions into account to obtain the overall temperature rising curve and the temperature profile based on battery thermal model. The temperature rising results under different battery resistance models (R=C and R= f(t)) are compared. It is useful to provide basic reference for further study in Ni-MH battery heat generation characteristics and the improvement for battery thermal management.
Development of a New Adjustable Water Injection Faucet
Authors: Han Cheng Cai , Feng Peng
Published: March 2013

Based on the analysis of the structure and the characteristic of the existing water injection faucet, a new type of adjustable water injection faucet is developed this article. The article introduces the structure, principle of the new adjustable water injection faucet and analysis and establishes the design calculation model with the relevant performance tests.
Ambient Vibration Test and Modal Analysis for MW Grade Wind Tubine Tower
Authors: Liu Xiang , Luo Gui Xin , Miao Zhan Yuan
Published: March 2013

Through the environmental pulsating measure in a 1.5 MW wind generator tower drum in Inner Mongolia wind farm , modeling and modal analysis of tower drum are finished with the ANSYS finite element software, and compared with the field measured results, the difference is in the allowed ranged. Proper interval exists between numerical simulation and data obtained from the wind generator tower drum inherent frequencies and blade rotation excitation frequency , which meets the standard design requirements of《Wind power generation unit tower》.
Modal Analysis of Vibrating Diaphragm in the Design of Ultrasonication System Based on ANSYS
Authors: Qiao Long Xue , Du Yao Hua , Chen Feng , Cheng Zhi , Li Chao , Gu Biao , Li Chen Yu , Duan Hao , Wu Tai Hu
Published: March 2013

An ultrasonication system for cells disruption is developed to extract nucleic acid from cells. The structure and operating principle of the ultrasonication system are explained, after which the key problems are stated. Based on finite element modal analysis, the top-ten natural frequencies of the round-shaped vibrating diaphragm are found having a character of stepped distribution, which can be divided into three grades. To optimize the vibration performance of vibrating diaphragm, simulation based on ANSYS is performed, the results of which show that medium grade frequency decreases with the increase of diameter while increases linearly with the increase of thickness.
Dynamic Simulation and Analysis of Pipes of Air Conditioners
Authors: Wan Zhong Min , Su Ka Lin , Zheng Zu Yi , Wan Jun Hua , Liu Jing , Huang Chong Qing , Wang Liang
Published: March 2013

It is essential to investigate the vibration properties of piping system in air conditioner. Finite Element Method is used to build the virtual prototype model of the air conditioner, and the dynamic responding analysis was conducted using ANSYS software. The modal analysis and harmonic response analysis was conducted for different modals and the results was compared. The simulation results showed that the vibration characteristics of modified model is better than that of the original model, thus resonance phenomenon could be avoided.
Analysis of Influence for Steering Performance of Vehicle on Road Surface Roughness
Authors: Yan Chun Li , Guo Yan Ling
Published: March 2013

It is very important that the flexible tires have some effects on the movement of the vehicle. To analyze the influence of the flexible tire on different road surface roughness in the steering movement of the vehicle, the paper cites the traditional two degrees of freedom (2-DOF) model for steering movement of vehicle, analyzes deformation of the tires when the flexible tires scroll on the hard and soft road surface. The paper establishes mechanical model about the relationship of the tires and different road surface, and advances mathematics equation in the typical 2-DOF model. To verify theoretical derivation the tests of steering motion of the vehicle are done on the different road surface roughness.The results show that yaw rate of the vehicle is very different on the soft and hard road surface when the vehicle steers along the same turning radius path and at the same speed. The results illustrate that analysis of theory is right.
Oscillatory Behavior for Even-Order Nonlinear Functional Differential Equations
Authors: Zhang Quan Xin , Gao Li , Li Chun Xia
Published: March 2013

In this paper, some sufficient conditions are obtained by discussing the oscillatory behavior of solutions for a class of even-order nonlinear functional differential equations, and our results generalize and improve some known results.
The Simulation and Application of Whip-Impact Sediment Dredging Technology
Authors: Li Jian Yong , Zhang Chao , Su Hong Lu , Li Fang Yi , Qin Shun Shun , Liu Zi Wu
Published: March 2013

Focusing on the dredging problem in Yellow River irrigation district, the whip-impact sediment dredging technology is put forward in the Xingjiadu Irrigation District. The finite element model of dredging process is built and the flow characteristic and behavior under design condition is studied, which can provide a theoretical basis for the feasibility of the whip-impact sediment dredging technology. Also, it can provide effective measures for the improvement of sediment dredging effects and whip-impact equipments.
System Development of Image Acquisition and Display Based on S3C6410 and USB Binocular Cameras
Authors: Yin Jing
Published: March 2013

This paper introduces image acquisition display system based on USB binocular camera which is developed by S3C6410 and embedded operating system WinCE 6.0. Hardware system is implemented on OK6410 development board, extending double camera by USB HUB as binocular camera. Software application is programmed by MFC. The system provides a feasible hardware plat form for subsequent three-dimensional visual system development.
Elastic Parameters Adjusted in Soil Slope Stability and Displacement Analysis
Authors: Jiang Ping , Zhang Meng Su
Published: March 2013

Soil elastic parameters(E, μ) will change when soil shear strength parameters(c, φ) reduced, so, it is necessary to adjust elastic parameters using strength reduction method for slope stability calculation. The numerical results show that the adjustment of elastic parameters has little effect on stability, but is more obviously on slope displacement. So, it is important to consider elastic adjust when evaluate slope stability based on slope stability.
Research on Correlation between Urban Low-Noise Pavement Air Voids and Sound Absorption Coefficient
Authors: Liu Yan , Yang Bing , Zhang Xiao Juan , Xu Qiu Xin
Published: March 2013

This paper test sound absorption coefficient of different air voids specimen in reverberation chamber and low noise pavement field testing, which gets main frequency band range of pavement noise is 315~5000Hz, noise arrives at the peak of about 500Hz; the relationship of microphone height and sound pressure level is not obvious; the porous asphalt mixture which air voids is more than 20% has the upper sound absorption coefficient at the frequency of 400~1000Hz, and its noise reduction effect is obvious; There is a linear relationship between the air voids and the maximum absorption coefficient of asphalt mixture, increasing air voids can cause larger absorption coefficient; sound-absorbing property of the low noise asphalt pavement is one of the dominant mechanism of mitigation traffic noise.
Measurement Techniques of Reference Line for Anchor System of North Anchorage of a Bridge
Authors: Li Xi Yuan , Guo Zhi He
Published: March 2013

As an important force part of the Bridge, the precise positioning of the construction of anchorage system is especially important. Combining with the practice of bridge engineering, this paper introduces the precise positioning of anchorage system by two-point reference line lofting principle. The results have proved that all the deviations satisfy the requirements of regulation by reference line lofting. This method decreases the cost, increases the measuring accuracy. It is worth wide spreading.
Research Status and Future Development of Smart Materials and Structures
Authors: Jian Li
Published: March 2013

As a newly emerging frontier interdiscipline, smart materials and structures possesses the great development potential and wide application prospect, and has become one of the research focuses at home and abroad.The research status of smart materials and structures is summarized, and its key technologies are analyzed. the future development of smart materials and structures is presented.
A Novel Embed Fluorescence Method for Monitoring the Change from Emulsion Polymeriztion to Microemulsion Polymerization
Authors: Feng Hai Ke
Published: March 2013

In this paper, we present a novel embed fluorescence method that allows one to monitor the change from emulsion polymerization to microemulsion polymerization with low monomer contents. The microemulsion polymerization of methyl methacrylate (MMA) was investigated using N-(2-anthracene) methacrylamide (AnMA) as the probe whose fluorescence emission intensity was proportional to the conversion of MMA into the polymer.In this research, the trace amount of AnMA unit looked like embed in the MMA chain. In a solution containing 3wt% of MMA with respect to water, with the anionic surfactant of sodium dodecyl sulphate (SDS) and water-soluble initiator of potassium persulfate (KPS), the process of changing from emulsion to microemulsion has been monitored. By contrast, with the non-ionic surfactant of polyoxyethylene (20) oleyl ether (Brij98) or water-insoluble initiator of 2,2′-azobis(isobutyronitrile) (AIBN), the process of changing from emulsion to microemulsion also have been monitored.
Application of Interferometry Measurement in Large-Scale Optic-Electrical Theodolite
Authors: Zhao Nan , Sun Zhi Yuan
Published: March 2013

Interferometry is a very important method in high accuracy measurement for optical system. This article briefly introduced the conception of interferometry and took a product of 4D Technology as an example to carry on the measurement. A large-scale optic-electrical Theodolite in assemblage was measured, and its primary mirror was 400mm in diameter. With the analysis of the results, some micro adjustments of the mechanical structure proceed, and it made the system perform better. The final results of the whole system is 1.061λ in P-V value and 0.1136λ in RMS value (λ=632.8nm), this meets the demand of optical design and practical application. The result demonstrates that interferometry is a good way to be utilized and optimize in the procedure of assemble.
Centroid Position and Intensity Distribution Measurement of the Small-Scale Focal Spot
Authors: Liu Xiao Yan , Lu Zhi Wei , Wang Xin , Ba De Xin
Published: March 2013

The measurement of the centroid position of small-scale focal spot is one of the most promising technologies for small-scale focal spot precise positioning. In this report, a method of two-dimensional scanning with CCD has been conducted to measure the centroid position and the intensity distribution of the small-scale focal spot. The theoretical analysis results are given.
Effective Prestressing Force Testing Method of External Prestressed Bridge Based on Frequency Method
Authors: Liu Han Bing , Wang Long Lin , Tan Guo Jin , Cheng Yong Chun
Published: March 2013

A practical project is taken for the example to analyze the application of frequency method in the effective prestress test of external prestressed bridge. In the process of solving the dynamic differential equation of tension cable, the effects of boundary conditions on the natural frequencies of external prestressed tendons are analyzed. The analysis results show that the fundamental frequency of the prestressed tendons under fixed boundary condition is higher than that under hinged-support support boundary condition, and the relative variance decreases with the increase of tensioning force. With the same tensioning force, the relative variance decreases with the increase of cable length. In the practical test, only the upper and lower bound limits can be obtained according to the measured prestressed tendon frequencies, while the real effective prestress values are between them. For external prestressed tendons, a kind of short tension cable, the frequency method can produce certain error in calculating the effective prestress.