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.     

干燥器和调温调湿器的余热循环利用

阐述了大庆炼化公司腈纶厂的调温调湿器和干燥器排气的工艺流程改进。2套干燥器的流程改造稍有不同,调温调湿器2个排放总管所接管线返到各自排放的区,干燥器2个排放总管所接管线只返到1区;设备流程改造1a后,产生明显的经济效益,减少了环境污染。     

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.     

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.     

Mullite-corundum refractories with silicon carbide for linings of transportable mixers

Investigations of the technology of mullite-corundum refractories containing silicon carbide and used for linings of transportable mixers are described. It is shown that an addition (10%) of silicon carbide to a mullite-corundum mixture ensures a high slag resistance. Mixers lined with mullite-corundum refractories with silicon carbide have shown high service properties, namely, 720 pourings of cast iron with 5 hot repairs. Translated from Ogneupory, No. 3, pp. 26–29, March, 1995.