Creation of a local differential subsystem based on a cellular network

В данной работе рассматриваются вопросы создания локальной дифференциальной системы (ЛДС) глобальных навигационных спутниковых систем (ГНСС). В качестве канала передачи корректирующей информации используется сотовая сеть GSM. ЛДС строится на основе геодезической контрольно-корректирующей станции (ГККС) и спутниковой двухчастотной навигационной аппаратуры «ИЗЫСКАНИЕ». Такая система позволит путем дополнения аппаратуры потребителя ГНСС специализированным модемом повысить точность определения местоположения до дециметровых величин. Преимуществом ЛДС является доступность для массового использования населением города Екатеринбурга. Вторым преимуществом является то, что система создается полностью на основе российского оборудования. Помимо этого, в статье решаются задачи точной координатной привязки фазового центра антенны ГККС и создания навигационной аппаратуры потребителя ЛДС.This paper is devoted to the problems of creation of local differential system (LDS) of GNSS. Mobile network GSM is used as a transmission channel of correcting information. LDS is based on geodesic control correcting station (GCCS) and satellite double frequency navigation equipment ―INVESTIGATION‖. Such system will help to increase accuracy of position determination to decimeters values by special modem adding to user equipment GNSS. Access for mass using by Yekaterinburg citizens is one of LDS advantages. Another LDS advantage is entire creation on the base of Russian equipment. Besides, this article solves the problems of precise coordinate connection of antenna GCCS phase centre and creation of navigation equipment LDS user

Evaluation of heat losses of the solar greenhouse during the heating season

The article presents the results of calculation of heat losses in greenhouses with different coatings, taking into account thermal-physical properties of coatings. In addition, based on the results of changes in external air temperature and solar radiation over time, numerical calculations were made on the heat load of a greenhouse with a useful area of 108 m2 and the thermal power provided by solar energy

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

Novel acryloylated and methacryloylated nanocellulose derivatives with improved mucoadhesive properties

In this work, three nanocellulose derivatives are synthesized with the aim of preparing new mucoadhesive materials. Nanocellulose is reacted with glycidyl methacrylate in dimethylsulphoxide, and with acryloyl and methacryloyl chloride in dimethylacetamide in the presence of 4-(N,N-dimethylamino)pyridine as a catalyst. These reactions are carried out under heterogeneous conditions, and the reaction products are characterized using various spectroscopic techniques, X-ray diffraction, atomic force microscopy, and thermogravimetric analysis. The Fourier-transform infrared spectra showed all the characteristic absorption bands typical for cellulose and also new peaks at 1720 cm−1 for the carbonyl group (C═O) and 1639, 812 cm−1 for the double bond (C═C). It is established that the crystal structure of the nanocellulose is slightly changed with derivatisation and the thermal stability of these derivatives increased. Mucoadhesive properties of nanocellulose and its derivatives is evaluated using the tensile test, rotating basket method, and fluorescence flow-through method. The retention of these polymers is evaluated on sheep oral mucosal tissue ex vivo using artificial saliva. Test results demonstrated that the new derivatives of nanocellulose have improved mucoadhesive properties compared to the parent nanocellulose

Photometry of the Didymos System across the DART Impact Apparition

On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, the satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated the efficacy of a kinetic impactor for planetary defense by changing the orbital period of Dimorphos by 33 minutes. Measuring the period change relied heavily on a coordinated campaign of lightcurve photometry designed to detect mutual events (occultations and eclipses) as a direct probe of the satellite’s orbital period. A total of 28 telescopes contributed 224 individual lightcurves during the impact apparition from 2022 July to 2023 February. We focus here on decomposable lightcurves, i.e., those from which mutual events could be extracted. We describe our process of lightcurve decomposition and use that to release the full data set for future analysis. We leverage these data to place constraints on the postimpact evolution of ejecta. The measured depths of mutual events relative to models showed that the ejecta became optically thin within the first ∼1 day after impact and then faded with a decay time of about 25 days. The bulk magnitude of the system showed that ejecta no longer contributed measurable brightness enhancement after about 20 days postimpact. This bulk photometric behavior was not well represented by an HG photometric model. An HG 1 G 2 model did fit the data well across a wide range of phase angles. Lastly, we note the presence of an ejecta tail through at least 2023 March. Its persistence implied ongoing escape of ejecta from the system many months after DART impact

SECURITY PROBLEMS IN THE GOLD MINING INDUSTRY

The article describes the importance of the gold mining industry and other industries that use it as raw materials, the main risks in gold mining, the largest accidents associated with the gold mining industry to date, the environmental impact of toxic substances used in gold mining, the impact on animals and people, as well as ways to eliminate or minimize these risks

Development and improvement of systems of automation and management of technological processes and manufactures

The development of means and systems of industrial automation, taking place along with the widespread use of modern information technologies, makes it possible to identify trends characteristic of this field of science and technology, and to predict the directions by which the most important changes will occur in the near future. It is shown that the main trend is a constant increase in the level of built-in artificial intelligence in control systems. From the standpoint of the most demanded and relevant areas of research and development, the driving forces and trends in the development and improvement of industrial automation systems are analyzed

TRANSPARENT CONDUCTIVE SN BASED

Transparent conductive Sn based electrodes are the most relevant solutions to many problems in physics and electronics. This article discusses the use, production methods, resistance, ratio, manufacture and application of transparent conductive Sn based electrodes

FEATURES OF CLINICAL PICTURE AND DIAGNOSTIC ASPECTS OF INTESTIONAL ROTATION AND FIXATION DISORDERS IN CHILDREN

Clinical manifestations and diagnostic methods of particular anatomical variants of intestinal rotation and fixation disorders were discussed by the authors in 208 children of different age groups. There was revealed the tendency to reduce rotation abnormalities diversity with the increase of age group. At the same time the frequency of occurrence of the colon fixation anomalies characterized by chronic recurrent process and progressing colostasis was enlarged