Model for the high cycle corrosion-fatigue damage of machine parts

The report is dedicated to a problem of the phenomenological specification statement of corrosive fatigue damage in the small stresses conditions. As the baseline equation usage the E.K.Pochtenny’s equation is offered, which one will to the greatest degree be matched with experimental results in a high-cycle corrosion fatigue conditions for steel specimens and full-scale parts. Also this equation is in a basis of the whole complex of designed methods of an estimation of durability and residual operational life of accountable of members of constructions operating in high-cycle fatigue conditions. The disadvantage of the equation is asymptotically lower branch, coming nearer to endurance strength, of a curve of fatigue, which one in corrosive conditions does not correspond to results of experiments. For overcoming this disadvantage the two-parameter equation for lower branches of a curve of a corrosion fatigue is offered. The calculus of arguments is spent with the help of the system of the nonlinear equations. The result of applying of the equation is showed on an actual example of a pump rods curve of fatigue

Social characteristics of HIV patients with suppurative diseases of the lungs and pleura and their effect on the disease outcome

The objective: to study the influence of certain social factors on treatment results of suppurative diseases of the lungs and pleura in HIV positive patients.Subjects and methods: 232 HIV positive patients with suppurative diseases of the lungs and pleura (the mean age made 36.9 ± 7.2 years) who were admitted to the clinic to have treatment. Various surgical interventions were performed in 171 (74%) patients, 10 (5.8%) had postoperative complications. Based on the outcome of suppurative disease, 232 patients were divided as follows: 42 (18.1%) - clinical cure with no X-ray signs in the lungs, 100 (43.1%) - clinical cure with residual changes in the lungs, 55 (23.7%) - improvement, 9 (3.9% ) - no changes. 26 (11.2%) patients died, of them 24 (10.3%) died due to systemic complications, 2 (0.9%) - due to pulmonary/intrapleural hemorrhage.In the patients, relationships between the manifestations and outcomes of the suppurative disease (pulmonary suppuration, pleural empyema, development of complications, fatal outcome) were studied considering each of 9 factors and using Spearman's rank correlation: age, education, employment status, marital status, tobacco smoking, drug abuse, alcohol addiction, the way of infecting with HIV, and in-take of ART. Only the inverse weak correlation was revealed between the level of education and fatal outcome (patients with higher education died less often), as well as employment and development of pleural empyema (in those employed, pleural empyema was less common)