bluuebunny/crossref_metadata_2025 huggingface dataset:
Exploration and Evaluation of Tourism Resources Engineering for XingWen Geo-Park
Authors: Wei Ya Li , Guo Shi Li , Zhao Shuang , Li Da Xing
Published: October 2014

Tourism has played an active promoting role in the development of economy growth as pillar industry of Xingwen County. Based on exploration of resources engineering, evaluation index system about tourism resource value and tourism conditions for supporting force has been established. The first step was determined weights of the evaluation factor by applying AHP (Analytic Hierarchy Process), and then the fuzzy mathematical evaluation method was used to calculate comprehensive scores of the tourism resource. The results show that the tourism resources are a distinct characteristic of Xingwen Geo-park and have great potential for further development. However, with a relatively slow economic growth, its current development is not that impressive. In terms of the evaluation results and the actual situation of the Geo-park, the author has put forward some measures which aim at providing a reference for the healthy development of the Geo-park tour.
NX-Based Parametric Design of Precision Molding Machine
Authors: Wang Bin , Hui Wei Dong , Zhang Jie
Published: October 2014

In this paper, NX-based parametric design of precision die-cutting machine was introduced according to enterprises' rapid design requirements. On the basis of the analysis of the classification and development trend of die cutting machine, the transmission system and stepper motors was studied, the four bar linkage mechanism was designed, and the design scheme was determined. Finally, UG/NX movement simulation was employed to show the working situation of the various mechanisms in the system, and parametric design of the whole mechanisms was realized.
Experimental Study on the Density of Fish Feed Pellets
Authors: Song Xin , Li Yan Cong , Wan Zhi Sheng , Zheng Shuang Shuang
Published: October 2014

For the problem of pellet density control in the fish feed extrusion forming process, the influence of extrusion speed, the depth of die hole and the interaction of the two factors on feed pellet density was studied by experiment method. The study results own good application value because as theoretical basis they can be used to determine the extrusion scheme and optimize the granulator structural parameters.
Finite Analytic Method for 2D Fluid Flows in Porous Media with Full Tensor Permeability
Authors: Liu Zhi Fan
Published: October 2014

In this paper, the finite analytic method is developed to solve the two-dimensional fluid flows in heterogeneous porous media with full tensor permeability. With the help of power-law behaviors of pressure and its gradient around the node, a local analytic nodal solution is derived for the pressure equation. Then it is applied to construct a finite analytic numerical scheme which deals with the divergence in pressure gradient. The numerical examples show that the convergence speed of the numerical scheme is fast and independent of the permeability heterogeneity. In contrast, the convergence speed slow rapidly as the heterogeneity increases when the traditional scheme is used.
Modal Analysis and Unbalanced Response Analysis of Rotor System
Authors: Huang Mei , Xing Zhao Yang , Zhao Yuan Yuan , Tang Jian Nan , Yuan Hao
Published: October 2014

In this article, the entity model of the bearing-rotor system is established and meshed in ANSYS. The natural frequency and vibration mode of the rotor system is analyzed in order to avoid the occurrence of resonance. At the same time, the results showed that not only the location of the unbalance incentive of the system should be taken into account, but also consider the size of the unbalanced force.
Modification of Finite Element Modeling and Analysis on Various Factors of Rupture during Square Plansifter Running
Authors: Qiu Ming , Liao Zhen Qiang
Published: October 2014

The rupture and its several influence factors on the short crossbeam of sieve case during square plansifter running are investigated. Aimed at the system consisting of a square plansifter and some suspenders, the FEM is employed to establish structure dynamic model for obtaining dynamic response. According to the contrast of the vibration data of sieve body in experiment and the displacement response from FEA, the finite element model is modified. Results show that the position where the maximum stress happens in FEA and the position of actual rupture are the same. Furthermore, the influence of various factors on the maximum stress of three dangerous positions are computed and analyzed. The results presented in this paper possess an important reference value to structural improvement and dynamic optimization of square plansifter.
Effect of Carbon Nanotubes on Morphology and Property of Natural Rubber
Authors: Shi Xin , Zhai Jun Xue , Li Yan , Zhong Guang
Published: October 2014

The dispersion of CNTs in NR and the interaction of CNTs/NR as well as the influence of CNTs on properties of NR used for tire tread were investigated by SEM, mechanical test and DMA analysis. The modified CNTs were thought to have better interaction with NR and higher dispersion than the unmodified one by the SEM and cure parameter analysis. And the addition of modified CNTs into the NR vulcanizate for tire tread improved the tear strength, modulus and anti-abrasion as well as the heat build-up when the formulation was adjusted.
The Necessary Condition for the Existence of the Periodic Solution of Honeycomb Sandwich Plate Dynamics Model
Authors: Quan Ting Ting , Li Jing , Li Xin , Zhu Shao Tao
Published: October 2014

In this paper we investigate the necessary condition for the existence of the periodic solution of honeycomb sandwich plate dynamic system of two-degree-of-freedom. We establish the curvilinear coordinates frame on closed orbits of the unperturbed system of the honeycomb sandwich plate dynamic system and construct successor function. Then we get the necessary condition of the existence of periodic solution by judging the existence of the successor functions. The existence of periodic solutions is important for studying the stability of sandwich plates.
The Roof Technology Research for LNG Cryogenic Storage Tank Based on ABAQUS
Authors: Yang Jiang Hui , Yang Gong Sheng , Ye Zhong Zhi
Published: October 2014

Based on the structural strength and stability theory, the paper introduce the basic principle and key considerations about the roof structural analysis, especially it should pay more attention to the concrete segment pouring effects. Taking the Tianjin LNG cryogenic storage tank as an example, which is independently finished by CNOOC, The finite element method is used for the roof strength and instability mode analysis, and study the failure sequence of strength damage and instability about the roof shell structure.
Comparison Research of Aircraft Panels Connected by Friction Stir Welding and Riveting
Authors: Ji Guo Ming , Cai Xiao Guang , Zhang Liang , Lai Hui , Zhao Bo Wei
Published: October 2014

Currently, friction stir welding has had a wide application in connection of aircraft panels. However, researches are rarely carried on in domestic aeronautics field, which involves the differences between FSW panels and traditional riveted panels in aspects of strength and stabilities under various working conditions such as shear and tension and compression. Picture frame fixture was used in this research for comparison test between two types of aircraft panels, which were connected to stringers by riveting and friction stir welding (FSW). Finite element models were established to simulate the panels in the shear tests which proposed a method to simulate the connection types. It is found that the FSW connection performs better than riveted connection in aspects of limiting load and initial buckling load, which proved that panel connected by FSW is better than riveting in mechanical properties. The test result is proved by FEM simulation, and vise versa.
Effect of Acrylamide Modified Liner on Properties of Self-Lubricating Spherical Plain Bearings
Authors: Qiu Ming , Hu Ren Song , Li Ying Chun , Yang Zhuo Pei , Duan Chuang Chuang
Published: October 2014

The effects of acrylamide modified liner on bonding properties and tribological properties of self-lubricating spherical plain bearings were explored by used of Instron5944 electronic universal testing machine and homemade spherical plain bearings friction and wear tester. The results showed that the bonding properties of bearings modified by acrylamide modified liner were much more improved than those of the unmodified bearings; Self-lubricating spherical plain bearing friction and wear properties and oscillating frequency obvious correlational dependence. With the increase of the oscillation frequency, the friction coefficient and the wear loss increased, while the friction temperature rose. The friction coefficient, wear loss and friction temperature of bearings modified were much more improved than those of the unmodified bearings. It showed that the liners after modification treatment can improve the tribological properties of self-lubricating spherical plain bearings.
Analysis of Configuration and Tension Force for Flexible Mattress by Lumped-Mass Method
Authors: Li Zhen Yu , Yang Ping , Sun Zhi Hua , Liu Lin Shuang
Published: October 2014

A lumped mass method is presented to analyze the tension force subjected by flexible mattress and its configuration. The method can take account of the elastic extension, non-uniform mass distribution of the mattress and the acting force due to flowing water. Through comparison between calculation results of this paper and catenary theory, it verifies the lumped mass method is more applicable for analysis of flexible mattress in real fluvial environment than commonly used catenary theory.
Setting-Up Wireless Communication System for Mine Rescue Robots
Authors: Xue Xu Sheng , Ma Hong Wei , Wei Juan
Published: October 2014

Aiming at the communication system breakdown after coal mine explosions collapses and other accidents, this paper puts forward an efficient construction method for long distance of wireless communication system in emergency with coal mind rescue robots which are self-adaptive and self-networking. With a two-level robotic system of detecting-robot and carrying-robot as the main, the carrying-robot, equipped with distributing device which contains a "roly-poly" wireless repeater, enters into an accident underground, analyzes the underground communication environment via network monitoring system, controls the distributing device and safely distributes the repeaters in order to realize secure and reliable communication with underground coal mine rescue robot. The test shows that the wireless communication system for emergency is rational, feasible, safe and reliable.
Entering Direction Analysis of Matching Area of Underwater Terrain Aided Navigation Based on Variation Function
Authors: Rao Zhe , Zhang Jing Yuan , Yin Wen Jin
Published: October 2014

In order to improve precision of underwater terrain aided navigation and make full use of the features of topographic information, an analysis method is proposed in this paper, in which the variation function is used as the measurement tool. We discuss what to explore relation between variation function and underwater terrain. Through fitting experimental variation function curve, the relationships of different directions of variation function to terrain information capacity are confirmed. Meanwhile, the analysis reveals that the matching area of underwater terrain aided navigation. The experimental results show that variation function reflects the spatial correlation of underwater terrain and the features of terrain. Then, the best entering direction of matching area is found. The certain theory proofs for selection about matching area, study of the terrain adaptation and route planning can be provided.
Survey of Cooperative Path Planning for Multiple Unmanned Aerial Vehicles
Authors: Cheng Xiao Ming , Cao Dong , Li Chun Tao
Published: October 2014

As an important part of cooperative control for multiple unmanned aerial vehicles (UAVs), cooperative path planning can get optimal flight path which can satisfy different constraints. Research on cooperative path planning for multiple UAVs is summarized in this paper. Firstly, problem description and constraints are given. Then, solution frameworks and path coordination approaches are summarized. After that, several control methods commonly used in formation of multiple UAVs are introduced respectively. Lastly, possible research directions in the future time are put forward.
Mechanical Property and Corrosion Resistance of the E309L Buffer Layer in Weld Overlay
Authors: Wang Zhi Ling , Ding Xiao
Published: October 2014

The weld overlay technology of high strength low alloy steel (HSLA) and austenitic stainless steel is widely applied in such fields as petroleum, chemical industry and energy, and its service environment is of high temperature and corrosion. As the matching performance is often poor for both austenitic stainless steel and high strength low alloy steel, cavities and crackles occur easily at the joints, which cause brittle fractures with dangerousness to some extent. So in the present study, the metal-inert gas welding (MIG) is used to clad the austenitic stainless steel to HSLA. In the experimental group, 4mm buffer layer (E309L) and 8mm cladding layer (E347L) were successively cladded on the substrate (Q345B), while 12mm cladding layer was directly deposited on the substrate in the control group. The hot corrosion tests were done, and through the scanning electron microscope (SEM), we observed the cross-sectional morphology. By the X-ray diffraction (XRD), we analyzed ingredients of the corrosion products. The corrosion products in the experimental group mainly consist of iron and nickel oxides, while the products are mainly iron complex compound and salt in the control group. The SEM results show the area near the welding seam of the specimens without buffer layer had been corroded severely. However, only a slight corrosion occurs adjacent to the welding seam. This demonstrates that the buffer layer can protect the specimens from being corroded.
Study on the Feasibility of Widely Usage of PSS in Multi-Machine Power System
Authors: Wen Yi Yu , Huang Miao , Liu Guo Ping , Liu Yu Ming , Zhao Ke
Published: October 2014

WSCC and IEEE have suggested that PSS should be widely used. In China, many PSS have already been used as the inter-connected grid is getting larger. However, the feasibility of Widely Usage of PSS hasn’t been proved, as PSS may introduce some negative damping. This paper indicates that PSS mainly transfers the damping from non-electromechanical mode to the electromechanical mode. And one generator’s PSS mainly enhances the electromechanical mode’s damping associated tightly with the generator, while introducing very little positive or negative damping to the electromechanical mode associated weakly with the generator. Widely Usage PSS’s positive effect is much more than the negative effect. As a result, Widely Usage of PSS is feasible.
An Entry Range Correction Scheme for Reusable Launch Vehicle
Authors: Yu Bin , Sun Chun Zhen , Wang Kai
Published: October 2014

An entry range correction scheme for reusable launch vehicle (RLV) is developed to reduce the deviation between the predicted range and the computed range. Firstly the physical mechanism is turned out to verify the scheme , then implementation is demonstrated. At last, simulation results illustrate this scheme is able to reduce the deviation, and this scheme is practicality useful.
A Novel Switching Control Method for Hypersonic Flying Vehicle
Authors: Wang Juan , Liu Ji Long , Wang Min , Wang Yu Zhe
Published: October 2014

With the rapid development of aeronautics technology, hypersonic flying vehicle is playing an increasingly important role, yet control methods on such vehicle were stilled confined with classical PID (proportional, integration and differentiation) or its variations. In order to have better control performance, a switching control method was used to design the attitude control law for hypersonic missile, which guaranteed higher angle precise control than PID. Simulation results showed the effectiveness and the superiority of the proposed switching methods over the classical PID and other typical switching methods.
An Expansion of LESO for Motion Control with High Frequency Disturbance
Authors: Wang Hai Qiang , Huang Hai
Published: October 2014

An improved controller based on ADRC is proposed for motion control with high frequency disturbance. Firstly, relationship between bandwidth of LESO and its parameters was mentioned, and bandwidth limitation come from the sensor noise is presented, indicating weakness of traditional LESO on compensation high frequency disturbance. Based on such analysis, two FIR filters is designed and added into the control loop, which compensated the specified high frequency disturbance and expanded bandwidth of LESO, acquiring a better motion control result. Simulations are taken, showing validity of the improved controller.
Decentralized Robust Coordinated Controller of Excitation and Valve for Improvement of Power System Stability
Authors: Li Zhi Min , Deng Xin Yang , Mou Xiao Ming , Rong Shuang , Sun Tian Kui , Peng Zi Nan
Published: October 2014

A novel robust control scheme for decentralized generator excitation and valve coordinated control systems to improve power system stability is proposed. By utilizing generator terminal voltage magnitude and phase angle to represent the interactions among generators, decentralized generator excitation and valve coordinated control in multi-machine power systems is achieved. The control is realized by robust parametric approach. Simulation results show that the proposed robust parametric coordinated control can improve power system stability.
Design and Research of Rotational Inverted Pendulum Control System
Authors: Gong Yu Fang , Liu Hu , Li Xin Ying
Published: October 2014

The work is designed and made as a controlled system of rotational inverted pendulum. Small direct current machine is droved by Single chip microcomputer that it controls the angle of swinging of swinging rod when the rotating arm does reciprocating rotation motion. The MC9S12CXS128 single-chip microcomputer is adopted as the master control chip of control system, the Angle of swinging rod is measured by the incremental encoder, power of the rotary arm controlled part provided by PM35S - 048 direct current machine and the motor drive module as a control system. It can realize measurement and control of the rotation angle of the rotating arm and the swinging angle of swinging rod precisely.
The Optimal Nonlinear PI Composed Control of Nonlinear Uncertain System
Authors: Chen Xian Li , Liu Xin Tao
Published: October 2014

An improved cooperative method to control a nonlinear uncertain system is raised in this paper. First, the optimal control law is introduced to attain the desired dynamics of the linear part of original system. Then, a nonlinear PI controller is used to remove the influence of uncertain unit. It is proved by simulation that this method is effective to control this special system and is easy to be carried in applications.
Torpedo Interception Based on Differential Game Strategy
Authors: Cheng Rui Feng , Liu Wei Dong
Published: October 2014

To realize maneuvering target terminal effective intercept and control, at the expense of the miss distance function, using pursuit-evasion differential game strategy analyze the effective intercept conditions of bilateral optimization strategy. Select different parameters to simulate the interception effect, the comparison shows that the method is not subject to specific target maneuver values, which can minimize the flexible of the potential role.
The Design and Implement of AIS Simulator
Authors: Wei Gui Rong , Wei Wei
Published: October 2014

In this paper, we first put forward the simulating function of AIS simulator. We give a brief introduction on how to develop AIS simulator, combined with the simulator interface, the simulate of operating process, the calculating of dangerous target’s parameter and the switching of different display mode. The simulator comprehensively simulated the FA-150 AIS equipment and meet AIS training.
Load Torque Observer Design of PMSMs for EVs Based on Square-Root Unscented Kalman Filtering
Authors: Chen Jian Feng , Sun Xiao Dong , Chen Long , Jiang Hao Bin
Published: October 2014

Varying load torque is an important influence factor in speed tracking of PMSM for EVs. This paper presents a PMSM control strategy using load torque observer. After introducing the entire structure of PMSM control system, a state observer is described based on square-root unscented Kalman filtering. Simulation tests are carried out to examine the speed tracking performance of PMSM compensated with the state observer. The results demonstrate that the proposed method is superior to another one using SMC in control accuracy and regulatory time.
The Directed Transport of Elastically Coupled Brownian Motors in a Two-Dimensional Potential
Authors: Wu Wei Xia
Published: October 2014

A model of directed transport of elastically coupled Brownian motors in a two-dimensional potential is established, in which one AC drive and a noise are acted on the non-ratchet potential direction but none is acted on the ratchet potential direction. Through numerical simulation, the position and the velocity of the coupled Brownian motors in two directions versus time are analyzed in different cases, which include that the AC drive and the noise are all moderate in the non-ratchet potential direction, no AC drive or no noise. The results show that at appropriate AC drive or the noise, there is a directional flow in the ratchet potential direction none acted.
An ATP-EMTP-Based Simulation Method for Lightning Back Striking Considering Impulse Corona and Coupling Ground Wire
Authors: Chen Jie , Liu Bao Zhu
Published: October 2014

The influence of impulse corona is taken into consideration by inserting equivalent complementary capacitance at both terminals of each short line based on its analysis. The model of tower is improved so that we can consider the effect of coupling ground wire (CGW) as well as that of impulse corona. The contrasts of lightning back striking simulation results show that impulse corona and CGW affects the breakdown data of transmission line and insulators greatly.
Analysis of Current Optimization Method on Compensation
Authors: Su Bin , Tao Shun , Xiao Xiang Ning , Wei Tian Cai
Published: October 2014

Nowadays, with the rapid development of industrial technology especially the power electronic technology, harmonic and reactive power problems are becoming severer. In sinusoidal conditions, there are no controversies on the definition of power quantities. In nonsinusoidal circuits, the traditional definition of active power is still applicable while the definitions of reactive power and apparent power are in controversy. Based on an optimization current decomposing method, this paper derives the expressions of optimal current and compensating current in a single-phase and a three-phase circuit by constructing a Lagrange functions. Based on simulation studies, the compensating effect of the optimization method is analyzed and shown; it can noticeably improve the efficiency of energy transfer in circuit. The paper presents all mathematical derivation of the method and verifies the results based on simulation.
Analysis of Input Phase for PLL in Dynamic Environment
Authors: Feng Yao Xuan , Bao Hai
Published: October 2014

In dynamic operating environment, it is one of key issues in the research field of electric energy metering that the accuracy of synchronous sampling signal based on phase locked technology. Because operating environment changes from steady state to dynamic, analytical description of PLL input signal becomes an urgent problem to be solved. In this paper, dynamic signal is analyzed mathematically by using zero-crossing detection theory, its phase expression is obtained, then mathematical equivalent conversion is made based on operation characteristics of PLL, its phase input equation is obtained, finally the correctness of the input equation is verified by Fourier transform method. This study lays the foundation for error analysis of electric energy metering system under dynamic condition.
Power Transmission Rule Described by Block Diagram
Authors: Chen Yu Long , Bao Hai
Published: October 2014

Analytically describing the relationship among steady-state power flow numerical values is a significant proposition. Because the block diagram has the ability to describe the signal transmission analytically, we choose this method to study the steady-state grid’s power transmission rule. Each node or branch is chosen as a basic power transmission unit, and the ratio between the unit’s output power and input power is defined as power transmission gain. The power transmission relationship of each unit can be established according to the circuit analysis, and then the block diagram of each unit can be built on the basis of above relationship. Finally, a block of the whole power grid can be drawn according to the basic units’ connection relationships. The transmission relationship of the whole power grid was analytically expressed by the block diagram simplification method.
The Temperature Field Research for Large LNG Cryogenic Storage Tank Wall
Authors: Yang Jiang Hui , Yang Gong Sheng
Published: October 2014

According to the structural characteristic of LNG cryogenic storage tank concrete prestressed wall and heat transfer theory, the paper obtain the calculation formula of the temperature field distribution, emphasis studying the heat flux distribution along the radial and axial and node temperature distribution of the section nodes for a 160,000 m3 capacity LNG cryogenic tank by ABAQUS. The paper also establish a set of method which is suitable for the temperature field analysis, proof the feasibility of finite element analysis technique in the analysis of the LNG cryogenic storage tank, and have a certain reference for the prestressed concrete walls and insulation layer design of the large LNG storage tank.
Study on the Critical Control of Foam Insulation Materials Produced by Waste TFT-LCD Glass
Authors: She Ling Ling , Guo Yu Wen , Ruan Jiu Li , Qiao Qi , Sun Shi Bing
Published: October 2014

The present work studied the critical control of foam insulation materials produced by waste TFT-LCD glass. The result showed that foam glass was affected by sintering temperature, as well as other factors such as foaming agent, oxygen supply agent and reaction time. The ordinary waste glass was used to drop the melting temperature of Waste TFT-LCD glass. The density of foam glass had a down-up trend with the increase of sintering temperature. The increase of ratio of foaming agent and oxygen supply agent led to a notable decrease of the density, while the change of reaction time exerted an unobvious influence on the density. The density of foam glass produced under the optimal conditions was 0.2211 g/cm3.
Research on Control Strategy for Low-Voltage Looped Network
Authors: Fu Hao , He Xu Jie , Tong Xiao , Tao Ye Wei , Lv Pei Qiang , Jiang Tong
Published: October 2014

This paper proposes a scheme of the looped network applied to low-voltage distribution network and introduces the control strategy for looped network in the normal event of a distribution network failure. Besides, the paper shows the superiority of the looped network in reducing the outage time and improving the power distribution reliability.
A Design of Different-Frequency Grounding Resistance Meter
Authors: Xu Chun Yan , Ai Wu , Wu Jing Tao
Published: October 2014

This paper introduces a design of different-frequency grounding resistance meter using MCU 80C196KB as the core. This instrument generates a current with a different frequency at about 120Hz to be injected into the ground grid. By adopting current-voltage method, the design enables an accurate measurement of the grounding resistance of large-scale ground grid, such as, power systems, architectural buildings, military facilities, and airports. The instrument controls the output of different-frequency electrical source by using MCU and DDS techniques. Moreover, the utilization of RMS-DC devices simplifies its data acquisition and data processing. In addition, the application of hardware and software filtering technology reduces the measurement error which may be caused by frequency interference, measuring disturbing between lead wires.
Effect of Transmission Tower on Electric Field under Overhead Lines
Authors: Liang Zhen Guang , Jiang Yu Ze , Liu Zong Jie
Published: October 2014

This paper discusses effect of transmission tower on electric field under overhead lines. Charge simulation method is used. Transmission tower is taken into account by using a simplified frame. Segments of tower frame are represented by finite straight line charges. Overhead lines with conductor sag determined by catenary equation are also represented by finite straight line charges. Calculation results show that transmission tower has shielding effect on closed region and distortion effect nearby tower leg.
Design of Power System Key Management Infrastructure
Authors: Zeng Rong , Hua Ye , Huang Xiu Li
Published: October 2014

There are multiple key management centers in power system due to historical and other aspects, and most key management centers are dispersed and serve different information security systems. It has not been implemented that key management centers are centralized management. And it is necessary to establish trust-based network system based on cryptographic techniques and achieve a safe and reliable access, transfer and application in network. We should build the infrastructure covering key management according to the requirements of the network, facilities and standardization to provide key support services for the certificate system, multiple key devices and key applications. Centralized key management is conducive to the protection of the business systems and reduces of duplication construction. This paper makes a structural design of key management infrastructure according to existing problems and actual demand of power business systems to provide support services for the currently running certificate system and key applications.
A High Rate Parallel Operation Encryption Card Design Base on FPGA
Authors: Zeng Rong , Huang Xiu Li , Chen Ya Dong
Published: October 2014

A design of encryption cards controlling multiple cipher chips’ high-rate parallel operation based on FPGA is proposed in this paper. According to the design method, we can achieve that multiple encryption card operates encryption in parallel way, which can improve the encryption and decryption rate of the encryption card without enhancing the performance of encryption chip, moreover, increase the key generation rate and management level of the key management system.
Design and Implementation of Colloidal Quantum Dot Field-Effect Transistors
Authors: Wang Hai Yan , Zhang Ya Ting , Song Xiao Xian , Jin Lu Fan , Dai Hai Tao , Wu Sen , Yao Jian Quan
Published: October 2014

With the breakthrough of mobility in quantum dot electric field transistors (Q-EFTs), the potential application in these functional devices has revealed and been paid more attentions, due to flexibility in design, low cost, facility for processing and large area. One of the most important applications of FETs is the photoconductive detector. However, these functional FETs have less been reported. In this work, colloidal PbS Q-FETs were successfully fabricated by reasonable structure design and layer-by-layer depositon technique PbS quantum-dots. The bipolar property was demonstrated by the output and transfer characteristics, as devices work in I and III quadrants simultaneously. The mobilities of electron and hole are 0.16 cm2/(V⋅s) and 0.28 cm2/(V⋅s), respectively. Q-FETs work as photoconductive detectors at both positive and negative gate bias voltages. Under constant gate bias, photocurrent increase exponentially with the intensity of light. The responding region consisted with the absorption range of PbS quantum dots. A linearity was found in drain voltage and incidence of laser power, the ratio was attributing to 0.0019 (μW⋅V)-1.
Experimental Research of Thermal Effect of Desktop Computer Motherboard
Authors: Li Mao De , Zheng Zhi Song , Qiu Cong
Published: October 2014

With the rapid development of desktop computer, its motherboard power consumption has become an important factor. In this paper, experimental research under different conditions of the motherboard components is carried out. We select four kinds of load conditions of empty load, 100% load, one high-definition movie online display and two high-definition movies online display simultaneously. Through the temperature changing, its thermal effect is shown and so as to understand its heat transfer mechanism of desktop computer motherboard. From the experimental results, it is seen that, when working time more than forty minutes, the computer motherboard temperature will reach the maximum value in each operating state.
Implementation Method of μC/GUI Chinese Font Base on Embedded System
Authors: Wang Xian Wei , Cao Fu Cheng
Published: October 2014

According to the current application of human-computer interaction interface is more and more complex requirements, implementation method of μC/GUI Chinese font based on the ARM embedded operating system with CortexTM-M4F kernel is designed, to download the font by PC and embedded system USB to expand FLASH memory, the μC/GUI kernel code is modified and the GB2312 Chinese characters codec driver is added, this makes up for technical blank of Chinese display in embedded system with μC/GUI library, to provide an efficient and flexible solution for no character of LCD in embedded system. The method provides a reference implementation for other LCD controllers driver and font library transplantation in μC/GUI. Experiments show that, the design method of extended Chinese font provides reference for interactive LCD driver transplantation and font realization; it has better practicability and universality in environment of μC/GUI system.
System on Chip Design for Multi-Principle of Relay Protection in the FPGA
Authors: Hu Peng Fei , Yuan Yu Xiang , Qu Zhi Juan , Jiang Xue Ping
Published: October 2014

To improve the reliability and integration of relay protection devices in power, the system on chip design for multi-principle of relay protection on FPGA is proposed. The data acquisition, digital signal processing, hardware protection algorithm, FPGA and MCU process scheduling, MCU and peripheral devices communication are designed, the hardware compilation model is set up by QuartusII on FPGA, and the simulation and experimental verification are performed. The results show that the proposed system can improve the speed of hardware protection and reduce the volume of the device, and has reconstruction on architecture.
The WSID Circuit Design Based on Arduino
Authors: Wang Gang , Jia Xiao Qiang
Published: October 2014

This paper combine Zigbee technology and RFID (Radio Frequency Identification ) technology together in order to design a controler circuit scheme that can flexible networking, RF drive, environmental parameters data acquisition, industrial control in one of WSID equipment. Described in detail the main circuit board Arduino, active RFID reader module Nrf24LE1 and CC2530 Zigbee module circuit design and the embedded software design and PC software design, the experimental results show the effectiveness of the system.
Optimization of Energy-Saving Lighting Line Adjustable Research
Authors: Wang Yin , Zhang Yun Zhe
Published: October 2014

Energy-saving lamp will still be a favorite product on the lighting market in the long run. One of the drawbacks of common energy saving lamp is that it cannot be dimmed. Energy is wasted when bright light is not necessary. To promote the idea of energy saving and environmental protection, a plan for the applicability of dimming of energy saving lamp is in urgent need. In this study, we put forward two plans for the dimming of energy saving lamp. Our effort is to make the energy saving lamp adapted to the variety of power frequency and to maximize its smooth dimming as close to that of an incandescent lamp.
A Novel Approach to Detect the Posture of Excavator’s Manipulator
Authors: Wang Hai Bo , Zou Hai Long , Zhang Ru Zhao
Published: October 2014

In the study of excavator automation, the conventional contact-type sensors can be easily damaged because of the collision or vibration when measuring the posture of excavator’s manipulator. For this case, a novel vision-based approach for measuring the posture of excavator’s manipulator is proposed. In this approach, an industrial camera with an infrared filter is used to grab the perspective images of the manipulator under the irradiation of a LED infrared light source; and saddle point detection is adopted to detect the man-made targets which fixed on every arm of the manipulator. Then the selection algorithm based on the fixed geometric dimensioning between two targets is optimized to select the saddle point in targets, and the posture angle of the corresponding arm can be derived from the saddle point coordinates. Furthermore, the detection regions are tracked by anticipating the three group targets’ movement separately. Experiments show that with the infrared device, the vision-based posture measurement system of the excavator’s manipulator can better adapt to different illumination intensity conditions; and the optimization of target selection algorithm reduces the false detection rate from 4 times in every 30s to 1 time in every 30s; also, the average processing time for every manipulator movement frame is reduced from about 70 ms to 50ms by tracking the detection regions separately.
Construction Machinery Intelligent Monitor
Authors: An Shi Qi
Published: October 2014

This paper introduced principle and function of construction machinery intelligent monitor. The STM32 microcontroller-centered, through to installation in construction machinery such as bulldozers, tractors, loader various sensor output signals on real-time acquisition, data processing and records to achieve work condition monitoring of construction machinery. Also monitor implementation methods are described in detail.
Low-Flux Neutron Radiation Detection Technology with High Sensitivity
Authors: Liu Yang , Xing Zhen Ni , Zhu Guo Zheng
Published: October 2014

Boron-containing plastic scintillator detectors have a high detection efficiency for low-intensity thermal neutrons and fast neutrons which is currently the preferred types of neutron detector. This article is based on Monte Carlo method, studied boron-containing plastic scintillator for neutron detection performance, and analysis the energy deposition flux characteristics and detection efficiency when low intensity fission neutron incident to the boron plastic scintillator. We obtain the low-flux neutron detector performance in a variety of neutron source energy, boron-containing plastic scintillator diameter and length. Results showed that, when the boron-containing plastic scintillator lengths increase, the energy deposition flux will increase. When the length and diameter is constant, increasing source strength can increase the energy deposition flux brought by the recoil proton to a certain extent. When the source intensity over after thermal neutrons, due to the decrease of the cross section, the energy deposition fluxes brought by the react of neutrons and will decrease. The results provide help for low intensity fission neutron radiation detection technology with high sensitivity.
Research and Application of S-4800 Scanning Electron Microscope in Modern Testing and Analysis Technology
Authors: Wen Quan , Ding Zhao Yang , Kou Fu Sheng , Zhou Peng
Published: October 2014

Mechanism and functions of S-4800 Scanning Electron Microscope are introduced in this paper. The image-forming mechanism and structure of SEM are studied, and the signal transformation of secondary electron and backscattered electron is presented. The main application fields of SEM are researched.
Research of the High-Precision Dual-Channel Sound Velocity of Seawater Measurement System
Authors: Zhang Bao Feng , Xie Zi Ming , Li Zhi Wei , Zhu Jun Chao
Published: October 2014

For single channel sound velocity measurement system accuracy was generally not high,a high-precision dual-channel sound velocity of seawater measurement system was designed.Based on ultrasonic speed of sound measurement in seawater with time-of-flight method,the system used ARM microcontroller to combine with high-precision time interval measurement chip,and the sound velocity measurement was translated into distance and time measurement. Then the influence of the time delay of the system was eliminated by method of difference.The paper introduced the modules of the system,and the high-precision time interval measurement method as the key technology of time-of-flight method for the velocity measurement system was expounded.It wasproved by experiment that the measurement accuracy of the system on the velocity reached 0.019m/s.
The Gyro Random Walk Analysis Based on Allan Variance
Authors: Dai Xiao Yan , Chen Zhi Gang , Xie Xian
Published: October 2014

In this paper, we did the analysis of the gyro random migration using Allan variance method, static output data using a three-axis gyroscope of the global first integrated six-axis motion processing components MPU6050. Experimental result shows that the fitting of bias instability and angle random walk smoother, it not only improves the estimation accuracy of random walk coefficient, but also the amount of data required is greatly reduced.
Non-Contact Temperature Measurement by Infrared Pyrometer in High Speed Milling
Authors: Yang Guang , Hou Jun Zhan , Zhou Wei , Zhu Lei , Duan Hong Jian
Published: October 2014

A method is described to measure temperature on rake face and flank face during high speed milling through the combination of using a non-contact infrared pyrometer and drilling two holes in the workpiece. One of the holes was vertical to the direction of feed for measuring the temperature of rake face, and the other was parallel to the direction of feed for measuring the temperature of flank face. The holes enabled probe beam of the pyrometer to go through them to reach the tool surface directly. The method avoids drilling any hole in the tool and can be used to measure the interface temperature directly. This technique has potential application in monitoring tool temperature and analyzing tool wear during machining of difficult-to-cut materials.
Water Quality Forecast Based on BP-Artificial Neural Network Model in Qiantang River
Authors: Ding Jin Ting , He Jie
Published: October 2014

This study aims at providing a back propagation-artificial neural network (BP-ANN) model on forecasting the water quality change trend of Qiantang River basin. To achieve this goal, a three-layer (one input layer, one hidden layer, and one output layer) BP-ANN with the LM regularization training algorithm was used. Water quality variables such as pH value, dissolved oxygen, permanganate index and ammonia-nitrogen was selected as the input data to obtain the output of the neural network. The ANN structure with 17 hidden neurons obtained the best selection. The comparison between the original measured and forecast values of the ANN model shows that the relative errors, with a few exceptions, were lower than 9%. The results indicated that the BP neural network can be satisfactorily applied to forecast precise water quality parameters and is suitable for pre-alarm of water quality trend.
Fan Fault Feature Extraction Based on Wavelet Packet Transform
Authors: Li Xin , Guo Pan Feng
Published: October 2014

Fan occupies the important position in many industry, it give rise to that fault diagnosis become the new hot research topic, also is the urgent demand of many manufacturing enterprises. This paper based on the theory of wavelet packet transform, selecting wavelet packet transform and energy spectrum to wavelet de-noising and fault feature extraction the fan vibration signal. And use the MATLAB get the fan vibration signal characteristic vector, lay the foundation for the fan fault diagnosis.
Experiment Analysis about Mechanical Properties of Rubber Bushing for Suspension Telescopic Shock Absorber
Authors: Li Li Ping
Published: October 2014

The experiments of static and dynamic characteristics of rubber bushing for rear suspension telescopic shock absorber were carried out at four directions such as axial, radial, torsion and yaw, by MTS831 and SAGINOMIYA test system. The tests prove that: rubber bushing has great damping, and rubber bushing has obvious nonlinear characteristic; the dynamic stiffness under low frequency and large amplitude excitation is smaller, while the dynamic stiffness under high frequency and small amplitude excitation is greater; at the same amplitude, the dynamic stiffness increases with the increasing excitation frequency. The test results can provide support for the optimization design of rubber bushing.
Study on Ball Screw Accuracy Reliability under Radial Force
Authors: Huang Lu Lang , Wang Ke She , Zha Chu Liang
Published: October 2014

The accuracy reliability problems have long been studied. In order to research ball screw’s accuracy reliability under radical force, some work have done. By using mechanical vibration theory, the dynamic response equation of the beams under external excitation has been derived out. Then by using Matlab, the dynamic response of screw rod under working circumstance is studied, and the dynamic response equation is obtained. At last some calculation examples have given. Results showed that screw’s polar moment of inertia section errors have decisive influences on precision and reliability. By using vibration theory and second moment theory, a new meathod have been proposed in evaluating the ball screw accuracy reliability. Key Words: Screw Transmission; Dynamic Response; Accuracy and Reliability
A New Approach for Determining Joint Stiffness of Bolted Joints
Authors: Wang Xi Wang , Li Xiao Yang , Zhang Lin Lin , Wang Xiao Guang
Published: October 2014

Joint member stiffness in a bolted connection directly influence the safety of a design in regard to both static and fatigue loading as well as in the prevention of separation in the connection. Thus, the accurate determination of the stiffness is of extreme importance to predict the behavior of bolted assemblies. In this paper, An analytical 3D axisymmetric model of bolted joints is proposed to obtain the joint stiffness of Bolted Joints. Considering many different analytical models have been proposed to calculate the joint stiffness, the expression based force equilibrium can be a easy way to choose the best expression for the joint stiffness as a judgment criteria.
The Critical Equipment Selection Used Criticality Analysis in Factory
Authors: Xia Yan Chun
Published: October 2014

The CA method of how to select target equipment in a whole plant for a PdM program is proposed in the paper. A set of evaluation standards using criticality analyzing approach are established. This method is applied in many plants and is verified with the actual condition of plant requirement. The evaluation results fit for the criticality of all plants and will be different in different plants because of service and functional role played even for the same type machine.
Wide Absolute-Photonic-Bandgap 2D Square-Lattice Photonic Crystal Based on Hollow Cylinders and Cross Connecting Plates
Authors: Wang Jing Jing , Ouyang Zheng Biao , Wen Guo Hua , Huang Hao , Lin Mi , Wang Qiong
Published: October 2014

Looking for photonic crystals with wide absolute bandgaps is always a challenging, attractive and significant task for optics scientists and optics engineers. In this paper, a new square-lattice photonic crystal structure is proposed based on a unit cell with a hollow cylinder and cross connecting plates. It is demonstrated through plane wave expansion method to have wider absolute photonic bandgaps compared with others reported.