Analogy between the Response of a Turbulent Jet and a Pendulum with a Randomly Vibrating Suspension Axis to Periodic Excitation

Experimental dependences, which illustrate the influence of the frequency and amplitude of the acoustic action on the aerodynamic characteristics of turbulent jets and mixing layers, are compared to the corresponding dependences obtained for a pendulum with a vibrating suspension axis. The similarity of them is noted. It is essential that the similarity indicated is based on the commonness of the nature of the phenomena occurring in these systems under the periodic action rather than on the similarity of the equations of motion in both cases.     

Optimization of the dimensions of isolated column footings with consideration of existing modular systems

A model is proposed for describing the elastoplastic deformation of soil which differs from existing models in simplicity and limited number of parameters determined from standard tests. The model takes into account the nonlinearity of soil, presence of irreversible deformations, sensitivity of soil, etc. Dnepropetrovsk State University. Dnepropetrovsk Steelwork Design Institute. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 2, pp. 13–16, March–April, 1994.     

Thermophysical properties of dielectric cermets of the Al2O3-Mo, -W, -Nb system

The thermophysical properties of dielectric cermets of the Al₂O₃-Mo, -W, -Nb system in the temperature range 50–1900°C were investigated. A semiempirical relation is used to correlate the experimental data.     

Radiological and angiocardiographical aspects of primary endocardial fibroelastosis in children (author's transl)

In this article we try to show the value of radiography and angiocardiography in primary endocardial fibroelastosis. The 20 CASEs studied in this report, were angiocardiographically and/or necropsically proved. In spite of different opinions, we think that it is possible to reach an approximate diagnosis of this condition if we use the clinical and angiohemodinamic examinations. On the other hand, it is necessary to point out that pathology is characteristic. The most important radiological signs were cardiomegaly, together with venocapilar congestion, both of variable magnitude, and dependent on the degree of cardiac insufficiency. By means of angiocardiography we could appreciate a great dilatation and hypertrophy of the left ventricle and a reduction of the mobility and distensibility of this cavity along the cardiac cycle.     

Herstellung und Charakterisierung von eiweißarmem zellstrukturiertem Material

Materials with cellular structure and a low protein content but a high pectin content have been prepared from apple parenchyma by simple procedures with only a few steps using small amounts of solvents. Materials with cellular structure from apple and a protein content less than 4% and a water-binding capacity higher than 80 g/g were obtained from the pressing residues of apple parenchyma by extraction at pH 8,4 to 9,1 and temperatures from 30 to 40° C, blanching in an aqueous environment, dehydration by ethanol and careful final thermal drying. Futhermore, additonal steps of alkaline deesterification and washing with acid were carried out for the preparation of samples with a low degree of esterification of the pectin component and a small content of ash. Such materials have a high content of free carboxyl groups (more than 1 mmol/g), but a reduced water-binding capacity.