Classification of Reconfigurable Parallel Mechanisms

Russian Engineering Research - The theoretically possible reconfigurable parallel mechanisms are classified, in terms of the layout of guides on the base. Formulas are derived for the...     

Dietary fibers of secondary vegetable raw material for correction of carbohydrate and lipid metabolism in laboratory animals

Drop of consumption by the population of dietary fibers is one of the causes of increase of sickness rate by diabetes in particular, and violation of carbohydrate metabolism in general. The purpose of research is definition of a degree of effect of dietary fibers of by-products of grapes processing (grape seed-cakes and press cake of grape pyrenes in an mixture with sorbite) on a carbohydrate and lipide metabolism in laboratory animals. During examinations is detected, that the vegetable products based on dietary fibers do not have negative action on physical development of animals, their body weight. The parameters of an amount of reticulocytes, erythrocytes, lymphocytes, hematocrit were in normal range. In animal, receiving dietary fibers of secondary grape raw material in a ration, the concentration of a cholesterol in blood serum was lower on 2-3% (5.6-5.9 +/- 0.2 mmol/l) as against control (6.0 +/- 0.2 mmol/l). The basal level of a glucose has appeared equal for control: 6.1 +/- 0.5 mmol/l, and for others groups of rats, consuming a dietary fibers with sorbite from 5.6 +/- 0.4 up to 6.0 +/- 0.5 mmol/l.     

The biotype and genetic characteristics of an isolate of the cowpox virus causing infection in a child

The study included 138 patients operated on for endo-extracellular pituitary adenomas which extend both intracranially and into the structures of the base of the skull. Operations via transcranial and transsphenoidal access to various tumor sites were performed in 38 patients (a main group), while 100 patients (a control group) underwent one of these operations. Two-stage operations, followed by removal of the suprasellar and basal regions of a tumor, are expedient for enhancing the efficiency of surgical treatment, reducing the incidence of complications associated with traumatic attempts at removing tumor parts hard-to-reach by transcranial or transsphenoidal approaches, as well as at reducing the number of relapses. At the first stage of surgical treatment it is advisable to make an intervention via transcranial access especially in cases of complex configuration of the suprasellar part of a tumor. The recommended interval between transcranial and transsphenoidal surgeries is 3-5 months. Two-stage surgical treatment does not lead to significant structural changes and to the increased number of complications, and to higher mortality rates as compared to one-stage surgery (transcranial or transsphenoidal surgeries alone).     

Studying the free convection in closed axisymmetric spaces

We have developed an analytical method of calculating the heat-transfer coefficients, the boundary-layer thicknesses, and the temperature and velocity distributions in the boundary layer for the quasisteady free convection in closed axisymmetric spaces for a given heat-flux density at the boundary. We have derived experimental relationships for the heat-transfer coefficient in the case of free convection in a sphere.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 16, No. 6, pp. 977–983, June, 1969.     

Lining of coke oven standpipes with concrete rings

Conclusions The service conditions of the coke oven standpipe lining were studied and the basic reasons for failure of it were established. A method was developed for production of large concrete rings for lining of the standpipes. The lining of concrete rings has a number of advantages over the lining of shaped chamotte parts including the possibility of mechanization of production of the blocks and doing the lining work and economy in fuel and energy resources in production.After 1–2 years of service the concrete ring lining of the standpipes is in good condition and defects are not observed.Translated from Ogneupory, No. 5, pp. 49–52, May, 1988.