中文_会议论文_将博数字资源平台

柴油机磨合工艺与润滑油及添加剂的相关性研究

作者：李柱国更新时间：2019.05.21

离散描述系统干扰解耦状态观测器设计及鲁棒故障诊断

作者：陈玉东,翁正新,施颂椒更新时间：2019.05.21

量子绝缘材料

作者：王寿泰更新时间：2019.05.21

两种新的光照方向估计方法

作者：杨杰,郭英凯,邓志鹏,李介谷更新时间：2019.05.21

基于N-S方程的数值Faraday水槽

作者：王本龙,刘桦,何友声更新时间：2019.05.21

High Frequency Inductive Heat Power Supply Based on Microcontroller AT89C52

作者：Yang Shulian，Wang Shengde，Shen Jin，Wang Xiangyou 更新时间：2019.05.21

A high frequency inductive heat power supply consists of high-speed V-MOSFETS was introduced. The frequency and power of the power supply were 1MHz and 5kW respectively. A high-speed PLL MM74HC4046 was used for frequency following its track automatically. The rectifier of the power supply was controlled by microcontroller. The biggest power was attained when steady and reliability of equipment was guaranteed. The experiment results show that the power supply is feasible.

A Framework for Designing Grid Workflow System based on Ontology

作者：Shanchen Pang，Shumei Wang，Changjun Jiang 更新时间：2019.05.21

Grid computing is innovative information service infrastructure for dynamic and distributed resources sharing and collaboration. Grid workflow is used to handle tasks with control and data dependencies,and plays an important role in Grid computing. It is essential to design an appropriate model to satisfy the distributed and heterogeneous workflow systems that must be flexible, reusable, dynamic feature in higher level. As the idea of the designing and composing semantic Web services, a method for designing Grid workflow system framework based on ontology is proposed in this paper. Four types of Ontology concept are defined: Workflow_Meta Ontology,Model Driven Method Ontology, Knowledge Representation Ontology and Date Types Ontology,and the particular description of their functions,constitutes and relations with each other are given.Based on this framework, the Grid workflow systems will have stronger capability to deal with their cooperation and dynamic composition with each other.

The Study of the Capital Financing Ability of Investment Banks Based on the Financial Integration

作者：Liu Ruibo，Zhai Yinjia 更新时间：2019.05.21

As the leading actor and backbone of the capital market, the core competence of investment banking becomes the focus that the scholars in and abroad the country paying close attention to. This text has analyzed the relationship of concentration ratio as well as the market scale of security industry in our country and the performance from the angle of promoting capital financing ability of investment bank. Comparing with developed investment bank of foreign countries, we draw a conclusion that the investment bank of our country is small in scale, weak in market competence, and lacking of the trade oligarch. In the face of the opportunity and challenge brought by financial integration, and the all-around opening of money market after entering the WTO, we propose expanding economic scale through the way of capital financing such as increase capital and stock, IPO, issuing bonds and M&A, to promote the core competitiveness of the securities company of our country.

An Intelligent Pressure Sensor Using Rough Set Neural Networks

作者：Tao Ji，Qingle Pang，Xinyun Liu 更新时间：2019.05.21

The nonlinear response characteristics of a capacitive pressure sensor (CPS) changes when ambient temperature changes widely. In such condition, the calibration becomes difficult and to obtain accurate pressure readout, appropriate compensation to the CPS characteristics is needed. We propose an intelligent CPS using rough set neural networks (RSNN) to provide self-calibration and compensation. The proposed model based on rough set and neural networks can provide the calibrated response characteristics irrespective of change in the sensor characteristics due to change in ambient temperature using rough set theory and compensates the nonlinearity in the respond characteristics using neural networks. Simulation results show that this model can estimate the pressure with a maximum full-scale error of ±2.5 percent over a variation of temperature from -50℃ to 150℃.

Study on thermal safety design index in high temperature coal mine

作者：Miao Dejun，Cheng Weimin，Sui Xiuhua 更新时间：2019.05.21

With the extension of mine exploitation,thermal disaster becomes more and more serious,which is the sixth nature disaster succeeding by water,fire ,gas,coal dust and roof.So,measures must be taken to improve the conditions of working environment.Non-mechanism cooling and mechanism cooling have been adopted in coal mine,especially to the mechanism cooling,the reasonable quantity of cooling need to be defined,which rely on the thermal safety index.The design of cooling in coal mine in China adopts dry-bulb temperature 26 ℃ as the single index at all times,but the index can't reflect the degree of heat disaster in detail.So,the new index needs to be defined to satisfy the requirement of thermal safety and saving energy.This paper adopts heat balance equation to study the thermal safety in coal mine,with the experiment,the heat safety model suitable to miners in China has been established,according to the model,new heat safety index has been defined.Under the new index,the miners'physiological status has been tested,the result shows that the miner's physiological status is better after one shift,so,it is a reasonable index that suitable to coal mine in China.

Ventilation information management of coal mine and visualization technique

作者：Wang Wei，Lu Guangli，Zhao Chunjie 更新时间：2019.05.21

The paper analyses the characteristics of mine ventilation system,gas and airflow regularities,discusses the method of visualization about ventilation system and ventilation safety information management,and designs the model of visual system for mine ventilation system.The model designed to actualize the fusion of ventilation and ventilation database,graphic processing of mine ventilation safety information and achieve the aim of visualization.The authors also point out application of visualization technique is one of the ways to solve the problems about safety in the ventilation safety of mines.

Methods to monitoring land subsidence due to underground mining

作者：Cheng Shu，Liu Mingxian 更新时间：2019.05.21

This paper first analyzes the contents,peculiarities and precisions of the methods for monitoring land subsidence due to underground mining.These methods include traditional surveying,using electronic theometer total station,GPS survey,and photogrammetry.A new monitoring method of InSAR was then introduced to improve the monitoring efficiency and accuracy.Next,how to integrate the InSAR with GPS was discussed.Finally,research themes on integrating GPS and InSAR were proposed for further studies.

Reliable Guaranteed Cost Control of Uncertain Systems with Time-Varying State Delay and Nonlinear Perturbations

作者：Nan Xie，Bin Xia 更新时间：2019.05.21

The reliable guaranteed cost control problem of uncertain systems with time-varying state delay and nonlinear perturbations are considered. A sufficient condition for the existence of reliable guaranteed cost controllers is derived in the term of LMIs. Furthermore, a convex optimization problem with LMI constraints is formulated to design the optimal reliable guaranteed cost controller which minimizes the upper bound of the closed-loop system cost. Numerical example illustrated the proposed method.

Fast Antenna Subset Selection for MIMO Wireless Systems

作者：Guowei Zhang，Lan Tian，Lan Peng 更新时间：2019.05.21

Along with the multiple-input multiple-output (MIMO) system gains, comes a price in hardware complexity and cost due to multiple RF chains. It is possible to alleviate this cost and at the same time maintain many advantages of MIMO systems by a technique known as antenna selection. In this paper, we propose a new receive antenna selection algorithm which is based on the analysis of the channel capacity. It can achieve very nearly outage capacity with the optimal selection method while keep low computational complexity. Besides, the bit error rate (BER)performance under Space-Time Block Coding (STBC)transmit scheme demonstrates the significant performance of the proposed selection algorithm.

Model Establishment and Parameter Calculation of Permanent Magnet-Biased Hybrid Magnetic Bearing with Magnet in Rotor

作者：XU Yanliang，XIN Feng 更新时间：2019.05.21

A new kind of permanent magnet-biased hybrid magnetic bearing (MB) with magnet in rotor is developed in order to reduce the bearing's volume and magnetic coupling between X and Y degrees-of-freedom. Its principle structure is introduced and magnetic circuit model is established, on the basis of which, the parameters such as maximum force, force to current ratio, force to displacement ratio and the magnetic coupling are calculated. 3-D FEM is adopted to verify the above analysis. The MB has been used successfully in the suspension of an attitude control/energy storage flywheel with angular momentum of 15Nms at speed of 30,000rpm, satisfying the demand of good stability and low power loss.

A New Type Single-Phase Induction Motor with Negative Sequence Compensatory Winding

作者：Hui ZHONG，Xiuhe WANG，Xuemei LENG，Daohan WANG 更新时间：2019.05.21

Because of the asymmetry of stator configuration, the gap magnetic field and the stator current would be asymmetric in the single phase induction motor. There is a biggish negative sequence magnetic field exited, which would make a disadvantage influence on the temperature of the motor, output torque and efficiency. This paper presents a new type single phase motor with negative sequence compensatory windings which are fixed on the stator to weaken the negative sequence magnetic field and improve the efficiency and power density. The mathematics model of this new type motor is described based on the equivalent circuit. The parameters and the characteristic of the negative sequence compensatory motor are studied by the comparison between the motor and normal motor, which is proved that the efficiency and the performance can be greatly improved.

Calculation of Stress Intensity Factors for Cracked Piston

作者：Yanxia WANG，Haiyan SHI，Yongqi LIU 更新时间：2019.05.21

The 1/2 rational 3-dimensional solid model of the piston is introduced to the powerful FEA software ANSYS 10.0 to analyze the thermal, mechanical and coupling stress fields of the piston. The calculation results indicate that the great tensile stress generates at the upper end of the piston pin seat, and show that thermal loads have little effect on the fatigue and damage, whereas mechanical loads are the dominant factors. Then the crack is produced at the stress concentration place through the long time working. These results are tallied with the experiments. Based on the theory of rupture and the experiments, the crack is considered to be type I, and the crack location and expansion direction also have been confirmed. The stress intensity factors of different crack depths between 0.15mm to 1.0mm are computed by using "top-down" substructure model method and J-integral. The calculation results are extremely tallied with the academic values offered by the handbook, the limiting error is less than 6％.Thereby the expression of the shape geometry factor for the given engine piston is obtained by curve fitting. This paper can afford a theoretical foundation for the fatigue and reliability analyses of this type of the pistons.

The Hopf Bifurcation and Quasi-Periodic Characters of Inverse Pendulum Motion

作者：Ming GAO，Yunliang TAN，Guirong TENG，Junguo CHEN 更新时间：2019.05.21

Inverse pendulum is a typical multi-variable nonlinear system. In this paper, the calculus equation of the nonlinear motion is made based on the Lagrange equation and the nature of the first Hopf bifurcation is obtained through stability analysis. By analysis of phase diagrams and time-series diagrams of different pendulum length l, mass m and elasticity K, It is shown that the inverse pendulum mechanical system embodies such nonlinear dynamics characteristics as Hopf bifurcation and quasi-periodic. When K/(mgl)1, the phase path is always a closed ring-like curve circling the central only stationary state A(0,0).Wben K/(mgl)<1, the phase path becomes a closed ring-like curve circling different symmetrical stationary state. The number of stationary state multiplies with the unceasing reduction of K/(mgl),and finally the system enters the quasi-periodic state.

Non-stationary and Small-time Scaling Behavior of Internet Traffic

作者：Qing 更新时间：2019.05.21

Scaling behaviors of traffic influence network modeling, service providing and traffic engineering. So it has been the focus of many researches. In this paper, an extensive wavelet analysis is performed to the TCP flows. The results show that the TCP flows exhibit non-stationary and uncorrelated scaling behaviors at the small-time scales(1-100ms). To identify the non-stationary and small-time scaling causing factors,the flow composition of the traffic is analyzed along two dimensions-flow byte contribution and flow density. And the results show the dense flow is the non-stationary and uncorrelated scaling causing factor in small-time scales.

Design and Implementation of Educational Administration Attendance Management System Based on B/S and C/S

作者：Zengguang Zhang，Peng Gong，Lijun Cao，Yunlei Chen 更新时间：2019.05.21

The majority work of the current educational administration management system concentrates on school Register management, the plan of education, course management, score management and so on, however, the Attendance Management has been ignored. The passage researches and designs the educational administration attendance management system on the basis of the current educational administration management system, servicing the college ’ s educational attendance work. The system is developed in the environment of VisualStudio.NET 2003 and Oracle9i with the architecture of B/S and C/S. The thought of layer is used in architecture design. Finally, the function of class-real time-query is given as test cases, with the result proving the system being content with the needs of the college in function.

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