Thermic

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Qiu Dehai - One of the best experts on this subject based on the ideXlab platform.

  • development of cars ztk i 60kg m 1 railalumino thermit welding consumables
    China Railway Science, 2008
    Co-Authors: Qiu Dehai
    Abstract:

    CARS ZTK-Ⅰ 60 kg·m-1 alumino-Thermic welding consumables are developed according to the theory of rail Thermic-welding.Chemical elements of welding metal mainly are C,Si,Mn,and other microelements are used to adjust the performance the welding metal,like intensity,hardness,tenacity,etc.The pouring temperature of the thermit metal could be appropriate if the weight of aluminium powder and the ferric oxide is 79.3% of the total weight of the welding powder.The speed of thermit welding reaction is the fastest when the grain size of aluminium powder is 40～80 mesh and the grain size of ferric oxide powder is 30～60 mesh,at the same time the thermit powder is not easily sliced.And thermit reaction relief additive is used to reduce splash of the molten steel during the reaction.The sand mould structure is optimized by means of computer simulation of Thermic steel flow field and solidification field in the pouring system.One-shot crucible is improved by stable raw material and improved thimble setting up structure.The static bending,fracture,fatigue,hardness,tensile and microstructure of the joint are inspected,and the results accord with the standard.The performance of welding joints is excellent after long time on site application.The welding consumables are applied both home and abroad.

  • Development of CARS ZTK-I 60kg·m~(-1) RailAlumino-Thermit Welding Consumables
    China Railway Science, 2008
    Co-Authors: Qiu Dehai
    Abstract:

    CARS ZTK-Ⅰ 60 kg·m-1 alumino-Thermic welding consumables are developed according to the theory of rail Thermic-welding.Chemical elements of welding metal mainly are C,Si,Mn,and other microelements are used to adjust the performance the welding metal,like intensity,hardness,tenacity,etc.The pouring temperature of the thermit metal could be appropriate if the weight of aluminium powder and the ferric oxide is 79.3% of the total weight of the welding powder.The speed of thermit welding reaction is the fastest when the grain size of aluminium powder is 40～80 mesh and the grain size of ferric oxide powder is 30～60 mesh,at the same time the thermit powder is not easily sliced.And thermit reaction relief additive is used to reduce splash of the molten steel during the reaction.The sand mould structure is optimized by means of computer simulation of Thermic steel flow field and solidification field in the pouring system.One-shot crucible is improved by stable raw material and improved thimble setting up structure.The static bending,fracture,fatigue,hardness,tensile and microstructure of the joint are inspected,and the results accord with the standard.The performance of welding joints is excellent after long time on site application.The welding consumables are applied both home and abroad.

Desmond G Johnston - One of the best experts on this subject based on the ideXlab platform.

Patrick Capolsini - One of the best experts on this subject based on the ideXlab platform.

  • Thermic: a 2—D finite—element tool to solve conductive and heat transfer problems in earth science
    Computers & Geosciences, 1999
    Co-Authors: Alain Bonneville, Patrick Capolsini
    Abstract:

    Abstract We present a C-language program, Thermic, that solves the 2-dimensional (pseudo 3D for axi-symmetric cases) conductive and advective heat-transfer equation. Thermic uses a finite-element method that takes into account realistic geometries, heterogeneous material properties and various boundary and initial conditions. As it also allows for latent heat (heat production due to crystallisation) and for thermal properties, such as thermal conductivity, to be dependent on temperature, it is particularly suited to heat transfer problems encountered in the Earth Sciences. We present sample applications from the various problems already treated by Thermic (cooling of magma chambers and dykes, the study of a granitic magma ascent or of pore water flow in sedimentary basins). Successfully tested on SUN® and SGI® UNIX workstations and on Microsoft Windows 95®, 98® and NT® 4.0 system based PCs, the Thermic package can be downloaded from the web (Thermic home page: http://www.ipgp.jussieu.fr/UFP/Thermic/html/Thermic_home.html) and contains source files, makefiles and environment files as well as executable files for both systems and an html directory with help and example files.

Pauline Taggart - One of the best experts on this subject based on the ideXlab platform.

  • Biotelemetric investigation of morphine's Thermic and kinetic effects in rats.
    Psychopharmacology, 1992
    Co-Authors: Richard I. Dafters, Pauline Taggart
    Abstract:

    A biotelemetric procedure was used to investigate the Thermic and kinetic responses of rats to a range of doses (0.0–30.0 mg/kg) of morphine sulphate. Both responses demonstrated a biphasic dose-response pattern, with depressant effects (hypothermia and hypokinesis) predominant at high doses, and excitatory effects (hyperthermia and hyperkinesis) predominant at low doses. The time-courses of the Thermic and kinetic responses were found to be uncorrelated. With repeated doses of morphine, the depressant effects were attenuated (tolerance) while the excitatory effects were augmented (sensitization). These results are interpreted in the light of current views of opiate function. The value of biotelemetry as a means of avoiding the confounding effects of drug-induced Thermic responses and Thermic responses induced by stressful temperature-assessment procedures is discussed.

S Forbes - One of the best experts on this subject based on the ideXlab platform.

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