Perspective of electrospark alloying method development

The way of electrospark processing of materials has proved the perspectivity in competition to otherways of metal working due to si mplicity of realization of technological operations,small to power consump-tion,practically unli mited scope.It is necessary to note,that last years the Russian development starts toretardin struggle against si milar development of the advanced industrial countries.Suffice it to say,thatJapanese firm TechnoCoat International Co.,Ltd produces manual installations…     

New processing method for fire forecast parameters

The time forecast system of coal spontaneous combustion was described based on the K J-90 mine environmental monitoring system in Hulipo Mine, Luzhou, Sichuan Province. In the system, CO and O2 sensor are added, and special-purpose microcomputer and software are equipped. By means of the system, the fluctuation laws of fire forecast parameters were observed in the process of coal-cutting, blast, exogenous mine fire and working face air quantity variation. This paper puts forward data processing method based on the Raita method.     

Mechanochemical method for producing iron-based nitrogen-containing nanocrystalline alloys

At present the use of nitrogen as an alloyingγ-phase locking element at both roomand lowtempera-tures in Fe-Ni-Cr alloys becomes a very perspective direction in development of new, high-strength non-magnetic materials . The practical application of nitrogen-containing steels will increase because of the ne-cessity of the consumption of efficient alloying elements . Nitrogen as an alloying element is available andhas alowcost ,and unlike nickel ,it doesn’t cause allergyin human body . Nitrog…     

Solving constrained minimax problem via nonsmooth equations method

A new nonsmooth equations model of constrained minimax problem was derived. The generalized Newton method was applied for solving this system of nonsmooth equations system. A new algorithm for solving constrained minimax problem was established. The local superlinear and quadratic convergences of the algorithm were discussed.     

Fractional gas analysis method for non-metallic inclusion control

The content ,nature ,size and distribution of oxideinclusions significantlyinfluence the quality of tyrecord,rail way ,bearing and stainless steel grades . The control of non-metallic inclusions allows predictingsteel properties but modern methods of non-metallic inclusions evaluation are highly labor and ti me-consu-ming.Fractional Gas Analysis (FGA) method developedis a modification of oxygen determination method,under non-isothermal conditions[1].It provides a possibility to separate and …     

Market-oriented management method of coalmine accident hidden dangers

By analyzing the problems which exist currently in the accident hidden dangers management of the coal mine, this paper proposed a new kind of management method--＂simulating the market＂, in which an operation pattern of simulating the market to transact hidden troubles was constructed. This method introduces ＂Market Mechanism＂ into safe management, and adopts measurable value to describe the hidden dangers such as＂ human behavior, technique, environment, equipments etc.＂. It regards the hidden dangers as ＂the goods produced by labor＂ which are found out by the safety managers and the security inspectors, then sells as ＂commodity＂. By the process of disposing, counterchecking, re-selling, and redisposing. It forms a set of market-oriented closed-form management pattern of coalmine accident hidden dangers. This kind of management method changes the past traditional methods in which the wageworkers treat safety management passively, but to encourage and restrict them to participate in the check-up and improvement of the hidden dangers.     

Fluidized bed control system based on inverse system method

The invertible of the Large Air Dense Medium Fluidized Bed (ADMFB) were studied by introducing the concept of the inverse system theory of nonlinear systems.Then the ADMFB, which was a multivariable, nonlinear and coupled strongly system,was decoupled into independent SISO pseudo-linear subsystems. Linear controllers were designed for each of subsystems based on linear systems theory. The practice output proves that this method improves the stability of the ADMFB obviously.     

New method of orientation and calibration for gas detector

The software system, hardware system and performance principle of the gas detector were briefly described. A new method was developed for orientating and calibrating the instrument. The method shows excellence in automation and intelligence,and presents simpler and more reliable new method for orientating and calibrating the nominal physical quantity of the nonlinear sensor.     

Study on the forecast method for underground coal mine

At present, coal mine fires were forecasted with some temperature, smog, CO, CO2, etc, however, this method can＇t meet the requirements for safe production of coal mines in monitoring accuracy and validity. Overcoming these problems of foregone monitoring methods, using multi-parameters which include fire image, smog, CO, CO2, O2, etc, the paper put forward a synthetical analysis monitor with advanced technology of neural network. The research and application of this method has significance in theory and practical value for coal mine fire forecast.     

Numerical simulation of coal-bed methane transfer with finite element method

The mathematical model and the numerical simulation for the transfer of coal-bed methane were established based on the combination of the porous flow theory and elastic-plastic mechanics theory and the numerical solution was given, together with the consideration of the fluid-solid interaction between the coal-bed gas and coal framework. Then the dispersion for the equation of gas porous flow and coal seam distortion was carded out and the functional analysis equation was obtained. Finally, the coupling solution was educed and calculated by finite element method (FEM) on a model example.     

Synthesis of tetramethyl ammonium hydroxide by cell diaphragm electrolytic method

1IntroductionTetramethyl ammoniumhydroxide(TMAH),as a veryi mportant catalyst,is usedin synthesizing or-ganosilicon products such as silicone rubber,silicone resin,silicone oil,etc..The most widely applicableway to manufacture polysilicone is the ring-opening polymerization reaction of organic ring siloxane(shortfor D4)under the existence of TMAH.Di methyl silicone polymer with hydroxide radical end-capped can beprepared,andits molecular weight can be controlled by this way,with a high out…     

Study on optimization control method based on artificial neural network

Introduction A great number of goal optimization questions exist in such fields as electronic science, control sci-ence, computer science and management science. So-lution to these questions can be summed up as seeking the maximum or minimum value to a certain definite goal function with constraints. Effective algorithms have not been found for many questions. In solving problems the problems’ time complexity is exponen-tial, it is difficult to find an overall optimized solution in limited ti…     

Evaluation method for expressway rock slope stability based on numerical simulation

Taking the deep cutting excavation of Beijing-Qinhuangdao expressway as an example, the paper utilizes DYNA-2D dynamic FEM procedure to simulate the rock blasting process. The computation model was based on dynamical response of nonlinear elasto-plasticity material. According to analyses of the distribution and transmission of stress field, displacement field, velocity field, and acceleration in the course of blasting,and discusses of the blasting vibration influence to the rocky cut slope from many sides.the calculated results met well with that of in situ measured results. It is easy to determine vibration state of any point in the slope such as stress, displacement, velocity and acceleration, which confirm that numerical simulation method is feasible. The meaning of this research is not only to design the blasting construction to forecast and prevent the expressway rocky slope from disaster in mountains area, but also to offer a new experience of numerical method in geotechnical field.     

Study on the offset of inflection point about probability function method

In this paper, rock mass is regarded as anisotropic clastic units and the partial differential equation of subsidence has been testified. The solution about homogeneous anisotropy has been obtained, The existence of inflection point offset in subsidence formula has been proved. Lastly, the relevant influence factors about the offset of inflection point have been simply discussed.     

Measurement method and experimental research on flame emissivity in coal-fired furnaces

The combustion condition in coal-fired furnaces of the large power station boiler is very complex and the flame emissivity is one of the important combustion parameters. A measurement method of the flame emissivity based on the blackbody furnace calibration of CCD （Charge Coupled Device） cameras and the color image processing techniques of computer was introduced. The experimental research on the flame emissivity in a 200 MW boiler furnace and a 300 MW boiler furnace was conducted respectively through the several CCD cameras installed at different height in furnace. The measurement results show： the flame emissivity increases with the increase of the unit load, the flame emissivity of the burner areas in furnace is the highest and the flame emissivity decrease with the increase of height of furnace above the burners area.     

On quantitative prediction of mine structure and application of the method

Coal mining activity is often restricted by geologic structural conditions, so it is very important to know the distribution situation of mine structures in advance of mining. For this reason, traditional qualitative procedure must give way to quantitative prediction method backed by mathematics theory and computer technology. This paper explores some relevant problems with the method, introducing a software, MSPS, used to predict automatically and quantitatively the relative complexities of geologic structures in different blocks of a coal mining area, with an application example employing the software to select the most suitable mining sites.     

The new surveying method of studying the internal layer''''s deformation law

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Preparation and properties of nano-composite ceramic coating by thermo chemical reaction method

Nano-composite ceramic coating was fabricated on Q235 steel through thermo chemical reaction method. Structure of the coating was analyzed and the properties were tested. The results show that a few of new ceramic phases, such as MgAI2O4, ZnAI2O4, AI2SiO5, Ni3Fe and Fe3AI, are formed on the coating during the process of solidifying at 600 ℃. The ceramic coating is dense and the high bonding strength is obtained. The average bonding strength between the coating and matrix could be 14.22 MPa. The acid resistance of the coating increase by 8.8 times, the alkali resistance by 4.1 times, the salt resistance bv 10.3 times, and the wear resistance bv 2.39 times.     

The scientific basics of aluminium containing raw materials treatment by the chlorous method

The technological basics for aluminiumproductionfromdifferent raw materials were developed.Inves-tigations were performed for aluminium oxide ,produced by aluminium hydroxide dehydration (which de-sorbs by lowtemperature carbonization of aluminate solution or aluminium hydroxide decomposition at al-kali treat ment method of aluminiumcontaining raw materials) ,and produced by saline decomposition,thatforming at acid beneficiation of aluminium.The thermodynamic analysis of a balance compound sys…     

The new surveying method of studying the internal layer＇s deformation law

This thesis illustrates the method and precision of employing analytical photogrammetry to carry out similar materials model experiment in surveying the displacement of surveying points and analyzing the deformation law of rock layersand earth‘s surface according to the results in the studying the deformation law of the earth‘s surface caused by extracting mine coal underground.