Abstract. The paper describes the aspects of the augmented reality application development on the base of ARToolkit for Android. The steps consistently used for the augmented reality application development have been considered. The simplest Java-based examples of augmented reality have been discussed.

536.532On the basis of a numerical study of the solution of a three-dimensional unsteady heat-conduction problem, we formulate practical recommendations for the choice of thermocouples to measure temperatures in thermal-insulation materials.The contact method of measuring temperatures with thermocouples has been widely used in the experimental study of temperature distributions in solids [i-2]. However, together with its obvious advantages, this method has an inherent shortcoming:the thermocouple indicates the temperature of the junction itself, which is generally different from the actual temperature at the point of measurement.This difference causes a systematic error in temperature measurements made by the contact method [2].It was shown in [3,4] that when a thermocouple is located along the normal to the heated surface of a sample of thermal-insulation material, the error may reach 50-70% of the actual temperature.The distortion can be substantially reduced if the thermoelectrodes of the thermocouple are placed parallel to the heated surface of the sample, i.e., in an isothermal plane [5]. At the present only approximate methods of estimating the accuracy of such measurements are known [i].We consider a two-electrode thermocouple with a junction whose thermoelectrodes are located in an isothermal plane of the sample under study.To simplify the discussion we replace the actual physical model of the thermocouple and the sample under study by the following computational scheme.In the region of the sample under study where the thermocouple is located we select a rectangular parallelepiped ~i with edges of length LI, L2, and L~ (Fig. i) such that the distortion of the temperature distribution on its faces resulting from the presence of the thermocouple is negligibly small.One face of the parallelepiped is heated by a radiation flux qin(T) which is uniform over the surface but varies with time. This surface is cooled simultaneously by natural convection (heat-transfer coefficient ~) and by self-radiation. The opposite face and the lateral surfaces of the parallelepiped are thermally insulated. The thermocouple is placed in the sample under study at a depth I.We replace the actual cross section S T of the thermoelectrodes ~2 and ~3 (a circle of of side r = dT/~/2 which has the same area as the diameter d T) by a square cross section S r actual circular cross section. We assume that the temperature of the free ends of the thermoelectrodes is constant and equal to the ambient temperature Tam and that there is perfect thermal contact between the material ~i under study and the thermoelectrodes ~2 and ~3 of the thermocouple.Under the assumption that there are no physicochemical transformations in the system of bodies under study, we formulate the following mathematical model of the problem posed:N. E. Bauman Moscow Higher Technical School.

Приведены результаты анализа термостойкости оболочек из кварцевого сте-кла и лейкосапфира (искусственного сапфира)Ключевые слова: газоразрядный источник излучения, тепловые испытания, ле-тательный аппарат, теплопрочность. THERMOSTABILITY OF CASINGS OF GAS-DISCHARGE TUBULAR WATER-COOLED RADIATION SOURCES

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