Heat transfer in fluidized beds

We propose a simplified model of external heat transfer in a fluidized bed. We compare calculated and experimental data, and recommend a computational procedure in polydisperse beds.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 49, No. 4, pp. 621–626, October, 1985.     

State observability and condition observability for a class of interacting discrete event systems

This paper introduces the concepts of state observability and condition observability for condition systems, a class of systems composed of discrete state components which interact via discrete binary signals called conditions. Given a set of externally observed conditions, state observability implies that the state of the system can be determined from the observations, and condition observability implies that all unobserved input and output conditions of the system can be determined from the observations. In this paper, we present a class of systems which is state observable and condition observable. We present a method to synthesize an observer system to provide state and condition signal estimates for a single component subsystem.     

Discrete geometry methods in processing complicated graphical information

The development of efficient techniques for converting information obtained from complicated graphical documents into a digital form is considered. It is shown that the use of discrete geometry methods make it possible to improve the efficiency of many technological stages. The work was supported by the Russian Foundation for Basic Research, project no. 00-15-96018 and by the Integration Foundation, project no. K-03392.     

On the optimization of metal forming

An approach to the calculation and design of metal forming is proposed and theoretically considered. This approach can minimize the nonuniformity of a deformation distribution over the cross section of ready products, which is equal to controlling the structure and properties of forged pieces. This approach is based on the calculation of the intermediate shapes of a forged piece by solving a set of inverse forming problems using the boundary element method and by constructing a forging process that is optimal according to a given criterion using dynamic programming.     

用PIXE方法研究骨折家兔骨骼微量元素的变化

用质子激发X荧光分析法测定48只家兔在挠骨骨折愈合过程中骨骼中多种微量元素含量的变化。结果表明，Fe和Sr分别呈鼓凸形和下凹形规律性变化，故Fe和Sr含量的变化可作为骨折愈合过程的指示剂。在骨折愈合过程中发现骨骼和血液中元素钙的相对含量保持不变，故无法为西医用补充钙来治疗骨折的疗法提供依据，但我们的研究结果却表明中医补充微量元素治疗骨折的疗法是有道理的。     

Conductivity estimation for highly porous permeable cellular materials

A simple but geometrically fairly rigorous model is proposed for the structure in order to estimate the conductivities of highly porous permeable cellular materials. The model is based on elementary cells that take the form of semiregular polyhedra (truncated octahedra with conducting edge bridges). A method is given for determining the increase in conductivity because of increase in the cross section of these edge bridges on intersection. The calculations agree well with experiment.     

横向光泵获得S_2紫外激光

用ＸｅＣｌ准分于激光器（３０８．１ｎｍ）横向泵浦Ｓ２激光器，又成功地实现了Ｓ２Ｂ－Ｘ态近ＵＶ波段的激光振荡。在波长３３０．９～３９０．０ｎｍ范围内观测到６条近ＵＶ激光输出。测量了有关的激光参数。