Solid-state amorphization of a quenched high-pressure GaSb phase studied by real-time neutron diffraction: evolution of the crystalline phase.

The amorphization of a quenched sample of the GaSb-II high-pressure phase was studied at ambient pressure by real-time neutron diffraction in the course of the sample heating from 100 K to room temperature at a rate of 0.4 K min(-1). The transformation to the amorphous state begins at 140 K and is completed near room temperature. The ß-Sn type structure was shown to represent only the mean lattice of the high-pressure GaSb-II phase. The superstructure of this phase widely varied with temperature and is caused by the ordered displacement of atoms. The temperature range of the metastable crystalline phase relaxation is divided into three intervals according to the temperature dependence of the tetragonality ratio (c/a). At the boundaries of these temperature intervals, i.e. temperatures T = 170 and 230 K, two second-order phase transitions are observed. Anomalous heat and volumetric effects were observed earlier by means of calorimetry and dilatometry in the same temperature range. Variation of the ß-Sn type crystal structure reflects the general tendency of ideal tetrahedral bond network recovery. All phase transformations observed were found to be irreversible.

[Changes in the gastroduodenal system in chronic nonspecific lung diseases]. / Izmeneniia gastroduodenal'noi sistemy pri khronicheskikh nespetsificheskikh zabolevaniiakh legkikh.

Chronic non-specific pulmonary diseases are frequently followed by the development of inflammatory-degenerative and erosive-ulcerative processes in the mucous membrane of the stomach and duodenum. The literature date are presented on the frequency of combination of these conditions, the attempt is made to assess their link from the viewpoint of pathogenesis. Disturbances of respiratory lung function and hypoxia as well as non-respiratory metabolic functions of the pulmonary tissue are regarded as etiological factors of pathological processes in the gastro-duodenal area.

[Early diagnosis of acute hematogenic osteomyelitis in children]. / O rannei diagnostike ostrogo gematogennogo osteomielita u detei

As evidenced by the author's findings, the use of the method of ultrasonic echolocation of long tubular bones facilitates the recognition of acute osteomyelitis in the stage of intramedullary abscess and also makes it possible to reduce the number of diagnostic errors and improve the results of treatment.