Applied Mechanics and Materials Vols. 143-144

Abstract: This paper presents a solution and design for avoiding over tripping in cases that short circuit happens underground coal mine. A method of multi-machine communication based on CAN bus is given to obtain selective short-circuit protecting. The design proposed in this paper can be easily realized and reach for demand in real application.

Abstract: Retracted paper: In recent years, much research has been devoted to the simulation of interrupts; unfortunately, few have analyzed the investigation of Smalltalk. After years of research, we prove the confirmed unification of suffix trees and robots. In this paper we motivate new robust information (Flete), which we use to confirm that multicast methodologies and Boolean logic are always incompatible.

Abstract: At present, the optimization of neighbors between TD-SCDMA and GSM is highly dependent on the experience and driver test, which lacks efficiency and accuracy. The paper provides a method of neighbor optimization among different systems. By combining together the Voronoi diagrams of TD-SCDMA and GSM cells, statistics on Handoveres between TD-SCDMA and GSM systems, the MR data of the GSM system and the performance statistics of the GSM OMC, the method not only boosts the efficiency of neighbor optimization, but also increases its accuracy as well.

Abstract: Radio frequencies magnetic flux compression generator is capable of producing and radiating ultra high power electromagnetic pulse by compressing magnetic field. As a maneuverable device, radio frequencies magnetic flux compression generator design has been developed and tested, it has been found widespread use in many fields. The radio performance is one of the most important parameters for radio frequencies magnetic flux compression generator. In this paper, the output current and voltage is given based on equivalent circuit model. In a bid to deliberate the radiation characteristic particularly, ring armature is equivalent to loop antenna in the light of electrically small loop antenna theory. The output voltage is used to feed antenna. Through analysis, the values of radiation strengths around radio frequencies magnetic flux compression generator 10 meters 50 meters 100 meters away are given. On the basis of the above analysis and discussion, the radiation characteristic for RF MFCG could be comprehended precisely.

Abstract: The implementation of WIFI technology in underground mobile intelligent information terminal system(UMIITS) was studied in this paper. Because of using Mine Information Service Center as the core and handheld intelligent terminal as the platform, this system can realize the query and feedback of the mine production and safety information. Miner's position and navigation, the level of production informatization would be improved with it.

Abstract: The paper provides a method to optimize the TD-SCDMA frequency based on the frequency-sweep and propagation model. The method overcomes the difficulty of obtaining the data of TD-SCDMA mobile measurement report and solves the problems of frequency optimization having poor effects in the path and low searching efficiency of the frequency optimization solution.

Abstract: To address the poor Stability of current mode PWM DC / DC converter when duty cycle [5] is greater than 50%, by analyzing the converter, the design.of appropriate slope compensation circuit is given. And by Comparing the experimental waveform through simulation, it can effectively solve the converter poor stability and interference.of noise, if the slope compensation is appropriate.

Abstract: This paper, based on the tiny error rule (TER) in algebraic sum method, derived the criterion for correctly expressing errors with significant digit, for the first time. Then, according to the criterion, an important conclusion is further reached, namely, any error only needs to keep three significant digits at most, or it is meaningless. Thus, this paper further perfected the theory of error, and so, it is of great significance for accurately processing all measurement data.

Abstract: The paper presents and designs a new-style gas monitor terminal in coal mine based on ARM chip called S3C2410A, which means the hardware and driver's designation of system uses S3C2410A as its central processing unit and also expounds the detail of software and hardware design. The system communicates with metrical instrument by the RS485 BUS. It can monitor the mine gas in network. It has good man-machine interaction contact surface and can be inserted into intelligence instrument as a general module.

Abstract: In order to overcome the problem of low tolerance in strong electromagnetic pulse and over-voltage circuitance,the author have done the experiments of over-voltage tolerance on communication interface device of Mine Safety Monitoring System ,using a standard mold by designing Test circuit of transmission signal and overvoltage suffertibility on netface communication interface.Then desiged Surge protection circuit of RS232 and RS432 interface by compareing the The greatest tolerence error-access capacitance caculated values and measured values.