Longitudinal changes in the incidence of glaucoma in Uzbekistan

Background: Glaucoma is not only one of the most common, but also one of the most severe chronic and progressive eye diseases. Therefore, the disease is a relevant problem in ophthalmology and a leading cause of reduced vision and irreversible blindness. Purpose: To assess the incidence of glaucoma in the republic and the city of Tashkent, and predict disease incidence for the subsequent decade. Material and Methods: The report of the Ministry of Health “On the numbers of diseases and registered patients residing in the primary service area of the medical facility» and national statistical collections (“Statistical materials on the activities of healthcare institutions of the Republic of Uzbekistan”) for 2010-2019 were studied to determine the incidence of glaucoma and the relevant characteristics in the republic. Results: These materials allowed us to obtain the data on annual incidences of newly diagnosed cases and annual incidences of first visits of previously diagnosed cases of glaucoma in adults (i.e., individuals older than age 19) in the regions of the country for 2010 to 2019 years. The prediction of the incidence of glaucoma in the republic of Uzbekistan and the city of Tashkent necessitates organizational and treatment-and-diagnostic measures for combating the disease, these measures being of a social and medical importance

CFD-mass transfer model process in a vertical sedimentation tank

Currently, the world is actively developing a logical course to create hypothetical strategies for the calculation of tanks for sewage sump. At the same time, engineers usually use balance models and one-dimensional kinematic models. These models do not take into account the hydrodynamics of the flow inside the sump and its complex geometric shape. This can be a serious deterrent to the widespread use of Navier-Stokes conditions when refining a regular plan. The use of CFD models based on the formulation of Navier-Stokes conditions requires the use of a really thin network, which leads to critical computer time spent on obtaining predictive information. To this conclusion, it is fundamental to form an successful CFD show to think about the method of wastewater treatment in vertical settling tanks, taking into consideration their geometric shape and plan highlights. The plans of individual parts, carried out by the strategy of the current count, are used. A 2-D-CFD demo was created that allows a vertical settler to be calculated in a few seconds, taking into account its geometric shape, the proximity of the central pipe, its parameters, and the proximity of a divider that has recently exited the pipe. The application of the strategy for checking the calculated space in the constructed show makes it possible to carry out coordinate numerical simulation of the flow hydrodynamics and mass transfer in settling tanks without limiting their shape. Creation of CFD models that allow, on the one hand, to require into consideration the geometric shape of the sump, the most physical forms of mass exchange within the structure, and on the other hand - requiring small time to get comes about. The created CFD demonstrate and the code based on it permit, with a little consumption of computer time - approximately the same as when calculating a one-dimensional demonstrate, to illuminate complex multiparametric issues that emerge at the plan arrange of vertical settling tanks, considering their shape and design features

Смешанные M-V-Sb-оксиды как катализаторы оксидегидрогенизаци

The properties of mixed M-V-Sb (M = Ni, Co, Bi, Sn) oxides, supported on aluminum oxide, have been physically characterized and their activities estimated .in dehydrogenation of light paraffins, ethyl benzene and ethanol. The most selective NiVSb catalyst was easily reduced which allowed for proposing of the reduction-oxidation mechanism .The result of kinetic researches has shown that, the concentration of oxygen in the gas phase is the key parameter responsible for dehydrogenation selectivity. To maintain the optimal process conditions, oxygen was distributed along the catalyst layers.Смешанные M-V-Sb-оксиды ( M = Ni, Co, Bi, Sn), нанесенные на оксид алюминия, были физически охарактеризованы в свойствах и оценены по активности в реакции дегидрирования легких пара-финов, этилбензола и этанола. Наиболее селективный катализатор Ni-V-Sb легко восстанавли-вался, что позволило выдвинуть предположение об окислительно-восстановительном механизме реакции. Результаты кинетических исследований показали, что концентрация кислорода газовой фазы является ключевым параметром, ответственным за дегидрирующую селективность. Для под-держания указанного оптимума использовалась распределенная подача кислорода по слою катализатора

Mixed M-V-Sb oxides as oxodehydrogenization catalysts

The properties of mixed M-V-Sb (M = Ni, Co, Bi, Sn) oxides, supported on aluminum oxide, have been physically characterized and their activities estimated .in dehydrogenation of light paraffins, ethyl benzene and ethanol. The most selective NiVSb catalyst was easily reduced which allowed for proposing of the reduction-oxidation mechanism .The result of kinetic researches has shown that, the concentration of oxygen in the gas phase is the key parameter responsible for dehydrogenation selectivity. To maintain the optimal process conditions, oxygen was distributed along the catalyst layers