Study of the Structure and Properties of Electrical Sand Concrete under Prolonged Exposure to Sulfate Environment.

Destructive processes accompanying sulfate corrosion of concrete significantly affect the durability of products and structures based on Portland cement. In the presented study, the long-term effect of sulfate corrosion on the electrical properties of electrically conductive sand concrete was studied. In the course of the study, the following were tested: an electrically conductive composition and a control composition based on plain Portland cement.

The Effect of Complex Modification on the Impedance of Cement Matrices.

The research results presented in this article were obtained by joint scientific research on creatingcement materials with reduced impedance. It is known that functional additives added to impart electrically conductive properties have a negative impact on physical and mechanical characteristics of the material. This study suggests using the multiwall carbon nanotubes in the amount of 7% from binder mass as a functional additive.

The Relationship Between Bronchial Patency and Parameters of ECG Supraventricular Component in Children With Bronchial Asthma.

Uncontrolled asthma (BA) can be complicated by cardiac conduction disturbances and arrhythmias. It is typical mainly for adult asthmatics patients. In asthmatics children the effect of bronchoconstriction on cardiac conduction, including the supraventricular component of the ECG, is currently under discussion.

Annual risk of tuberculous infection measured using serial skin testing, Orel Oblast, Russia, 1991-2005.

Objective: To compare trends in direct annual risk of tuberculous infection (ARTI) during 1991-2005 in relation to tuberculosis (TB) incidence and to indirect estimates of ARTI derived from the prevalence of tuberculin skin test (TST) positivity in schoolchildren in Orel Oblast, Russia.

Design: In 2005, we abstracted annual TST results and vaccination histories from a representative sample of schoolchildren in Orel Oblast, Russia, where bacille Calmette-Guerin (BCG) vaccination and annual TST of children are nearly universal. We calculated direct ARTI based on the percentage of children tested with TST conversions each year, excluding conversions following BCG vaccination.

[Exudative pleurisy of tuberculosis etiology in Russia's children and adolescents by the data of the new tuberculosis cases registry].

The paper analyzes the incidence of tuberculous exudative pleurisy (TEP) in children and adolescents in 30 administrative subjects of 7 Russian Federal Okrugs in 1992-2000. TEP was detected in 957 individuals, including 451 (5.3%) children and 506 (11.