Niiteplopribor (Russia)

The problem of increasing the fire resistance of buildings and structures is still relevant. Nowadays, fireproof intumescent and other materials with a limited service life are used to ensure fire safety of infrastructure and social facilities. Among these, fire-proofing of metal structures is one of the vital problems. The results of studying samples of fire-retardant intumescent coatings based on ammonium polyphosphate-melamine-pentaerythritol and subjected to artificial climatic aging (3, 6, and 9 years) and thermal exposure (heating to 300 and 500°C) are presented. The methods of X-ray diffraction and thermal analyzes, optical and IR spectroscopy are used to study the phase and structural composition of materials. It was found that the intumescence of the samples significantly decreases during service life of the coating. This leads to a decrease in the fire resistance of the protected object. Moreover, a sharp change in the phase composition of materials occurs as a result of aging and heating, accompanied by a decrease in the degree of crystallinity. Since the composition of fire-retardant coatings plays a key role in ensuring the fire safety of buildings and structures, the results of the study can be used for timely detection of violations in the quality of coatings and forecasting their service life.

Chronic tonsillitis is a very common disease, often occurs in patients with somatic pathology, such as enterocolitis against the background of lactase deficiency, diabetes, kidney disease. Chronic tonsillitis is accompanied by halitosis, and with comorbidities, this symptom may become dominant. With exacerbation of chronic tonsillitis, patients are forced to increase the drug load, which is due to concomitant somatic diseases. To prevent polypragmasy, doctors more often began to turn to modern means of bioregulatory therapy, providing detoxification and anti-inflammatory effects. Of the diseases of the internal organs, giving an unpleasant smell from the mouth, in the first place is diabetes. Treatment of diabetes, especially in the newly ill, takes a lot of time and effort, and a more rapid deposition of plaque and the formation of tartar in violation of microcirculation and deterioration of tissue supply, including in the oral cavity and pharynx, contributes to halitosis. The appearance of an unpleasant odor in diseases of the kidneys, liver, endocrine system, intestines in exhaled air, due to metabolites in the blood, is persistent and does not respond well to correction. In this regard, the search for detoxification drugs is relevant. Having studied the pharmacodynamic capabilities of the drug Engystol we paid attention to its ability to improve the condition of patients with viral infections, allergic reactions, restore metabolic processes in tissues, maintain general homeostasis. Unlike many drugs that have a toxic effect on the liver, this bioregulatory drug is safe.

We investigate the influence of the magnetic Reynolds number Re m on the signal from electrodes in an the electromagnetic flowmeter. Conditions for eliminating this dependence by applying an inhomogeneous magnetic field, several pairs of electrodes, and a numerical integration algorithm are considered. We demonstrate the possibility of calibrating the flowmeter using a low-capacity liquid-metal flow fixture.

The reliability of the main equipment of any power station depends on the correct water chemistry. In order to provide it, it is necessary to monitor the heat carrier quality, which, in its turn, is provided by the chemical monitoring system. Thus, the monitoring system reliability plays an important part in providing reliability of the main equipment. The monitoring system reliability is determined by the reliability and structure of its hardware and software consisting of sensors, controllers, HMI and so on [1,2]. Workers of a power plant dealing with the measuring equipment must be informed promptly about any breakdowns in the monitoring system, in this case they are able to remove the fault quickly. A computer consultant system for personnel maintaining the sensors and other chemical monitoring equipment can help to notice faults quickly and identify their possible causes. Some technical solutions for such a system are considered in the present paper. The experimental results were obtained on the laboratory and experimental workbench representing a physical model of a part of the chemical monitoring system.

A magnetic flowmeter for liquid sodium is described. The inductor in this device consists of an electromagnet generating a pulsed, low-frequency, magnetic field. The use of a pulsed magnetic field made it possible to separate the informative component of the signal from all electromagnetic interference whose time variation is not a multiple of the frequency of the excitation magnetic field. Thus, all interferences at the industrial frequency and the thermo-emf are eliminated. This increases the accuracy of flow rate measurements significantly and makes it possible to reduce the magnetic field in the channel. The power of the inductor does not exceed 0.5 W. There is no need to adjust the zero point, and it is possible to measure low flow rates and the reverse flow. The physical principles of the method of measurement, the design particulars and technical characteristics of the device, and the results of tests are examined.

The effect of microgeometry of the surface layer on functional properties of brake coupling is discussed. Potentialities of optimization of surface microgeometry of the components are confirmed.

In producing welded joints in DU800 bimetallic pipes of the multiple forced circulation circuit [parent metal – 22K pearlitic steel and stainless steel cladding (04Kh20N10G2B steel)] for RBMK-1000 nuclear energy systems, the producing and assembling companies initially carried out welding of the outer side of the main layer of the pipeline made of the pearlitic steel and this was followed by welding (reconditioning) the protective deposit (cladding layer) inside the pipeline. The welding (deposition) of the cladding layer inside the pipeline is a complicated technological operation, even in the assembling conditions. The execution of this operation in repair after service, taking into account the requirements of the RB standard, makes his operation not only exceptionally complicated but, taking into account radiation doses, also unsafe. The Scientific Research Institute of Heavy Engineering (TsNIITMASh) developed and carried out investigations of a new technology of repair of DU800 bimetallic pipelines of the MCS of RBMK-100 power units on the outer side (‘one-sided’ welding) without affecting the protective cladding of the root sections of the welded joint.

A conductometric method of measuring the level of molten sodium without the elements of the level gauge entering the tank is considered.

The kinetics of electrode reactions in the Fe(CN)3-/4- 6 redox system is studied on the platinum-doped (Pt content up to 15 at. %) amorphous diamond-like carbon thin-film electrodes. The wide-gap diamond-like carbon is electrochemically inactive per se; yet, it acquires the electrochemical activity on adding platinum to the film bulk during the film growth. The effect of platinum is of a threshold character; at the same time, with increasing platinum content, the electrode differential capacitance increases smoothly, and the resistivity of the material remains practically constant. The effect is explained with a model which assumes that both the conductance in the film bulk and the catalytic action of platinum on the charge transfer at the electrode/solution interface have a nonuniform character.