Chuvash State Agricultural Academy

BACKGROUND: A multivariate cabbage harvester of a block-modular design is proposed for small-scale farming in vegetable growing. At the same time, the cabbage harvester is considered to have three configurations: with an elevator, with a lower longitudinal conveyor, with an elevator and an upper longitudinal conveyor. AIM: Modeling the working process of a multivariate cabbage harvester to identify its main technological parameters that ensure the efficiency of its operation. METHODS: The working process of a multivariate cabbage harvester is presented as the functioning of a certain physical system, the state of which changes during the technological process over time depending on stochastic factors. The process of sequential transition of a system from one state to another is considered on the basis of queuing theory depending on the motion intensity of the flow of cabbage heads λ in the technological line of the machine and the service intensity μ of this flow. In this paper, the maximal probabilities of the model states are determined and the stochastic indicators of its functioning are calculated. RESULTS: Based on the results of calculations of stochastic indicators of the functioning of the model, the optimal number of service personnel n = 2 people was found, when the maximal probability of servicing cabbage heads can be up to 0.934. CONCLUSION: The working process of a multivariate cabbage harvester is modeled as a stationary stochastic queuing process. Based on the study results, it is recommended to take the number of service personnel at the refining table of the harvester as n = 2 .

During the operation of a high-pressure fuel injection pump, the friction surfaces of the main elements are subjected to various mechanical, thermophysical and hydroabrasive effects, which increases the wear rate of precision elements and reduces the cyclic fuel supply through the cylinders. The purpose of the research is to increase the resource of the main elements of in-line high-pressure fuel pumps by modernizing the power supply system. The main factor affecting the performance of precision elements is the presence of carbovalt in hydrocarbon fuel, that is, mechanical impurities in the form of an abrasive that circulate throughout the entire circuit of the power supply system, can pass through the filter element and get into the junction of precision elements during the injection cycle, where they are pinched and abraded work surfaces. In addition to mechanical impurities, hydrocarbon fuels may contain surfactants such as sulfur, phosphorus, etc. Under certain conditions, this also accelerates the wear rate of friction pairs, especially at temperatures above 50°C. With an increase in temperature, the lubricity of hydrocarbon fuels decreases, since sulfur compounds are activated, which destroy the structured surface at the boundary of friction pairs. To reduce this effect, it is proposed to limit the increase in temperature in the diesel power system by installing a radiator with a fan. With temperature limitation in the diesel fuel system, the wear intensity will be lower, the viscosity will be consistently higher by 2 times or more, which will reduce fuel leakage in mating surfaces. The above analytical expressions indicate that the size of the fuel leakage depends on the Reynolds number. With an increase in viscosity, the Reynolds number decreases several times, while the consumption coefficient and fuel leakage through the gaps of the friction pairs are significantly reduced. The proposed measure makes it possible to preserve the lubricity of the fuel, reducing wear and increasing the service life of the main elements of the fuel injection pump.

The genus Fillus Navás, 1919 (Ascalaphidae: Ascalaphinae) is recorded for the first time from Venezuela based on a female. This is the northern-most locality of the genus. It is preliminarily assigned to the Brazilian species F. amazonicus Machado et Rafael, 2011.

The article describes simulation of walking process locomotion for ReMotion medical exoskeleton. The simulation was carried out in RecurDyn – specialized software, designed to calculate dynamics of various bodies. The model description and preset software parameters are given. The technique of the exoskeleton jointing to ensure stable position in the model is described, kinematic pairs parameters are set. The study results are given as graphs of changes in responses and moving torques in the exoskeleton drives. The simulation results can be used to evaluate power indicators of movement (walking). These results are included to the input parameters for the synthesis of the exoskeleton kinematic pairs framework and the exoskeleton drives.

Diesel particulate matter (DPM) is an area of concern from an environmental point of view due to its functionality to settle in the respiratory channels when inhaled, cause inflammation in the respiratory tract, accumulate carcinogenic compounds, and adversely reflected the cardiovascular functions, thus causing excess mortality. DPM consists of an agglomeration of a numerous unions of preimages germ structures, spherical in the form of turbostratic carbon. Part of the DPM contains partially oxidized polyaromatic compounds C and H with a ring structure (PAH).

Subject. This article deals with the issues of development of agricultural enterprises and ensuring food security of Russia. Objectives. The article aims to analyze the financial condition of comparable enterprises of the cereal-processing industry in various regions of the Volga (Privolzhsky) Federal District. Methods. For the study, we used a financial analysis. Results. Based on a comparative analysis of the effectiveness of asset management and sources of financing of leading enterprises of the agro-industrial complex of the Volga Federal District, the article formulates recommendations for improving the efficiency of their financial policies. Conclusions. The particularities of the formation of sources of financing and the structure of property affect the financial results of the enterprise.

When studying the process of formation of soot nuclei in a flame, it is necessary to pay attention to the sequence of chemical transformations of fuel molecules in order to determine the concentration of dangerous toxic components in the exhaust gases (EG) of a diesel internal combustion engine (DICE). Today, numerous studies are being conducted to establish a detailed kinetic mechanism of the process of carbon condensation and gasification in a DICE. Despite significant progress in understanding the essence and some regularities of the processes occurring in a DICE, it is not yet possible to compile a numerical model that can predict the main indicators of soot content. A semi-empirical mathematical model of soot formation and burnout in a DICE is presented, compiled on the basis of a kinetic model that reliably predicts the dynamics of soot content in the cylinder and the concentration of soot in the EG in a wide range of operating modes of a DICE. The model makes it possible to facilitate the process of studying the factors of soot formation and reduce the cost of conducting experimental studies related to the search for alternative fuels and improving the design of a DICE, optimizing the operation of fuel supply and gas distribution systems.

The article presents the results of the effect of fumaric acid, dipromonium and vitamin C on productivity, physiological state and natural resistance of sows. The scientific and economic experience was carried out at the pig-breeding complex with a production capacity of 27 thousand heads “Voskhod” in the Mogilev region of Belarus. Forty primiparous gilts were divided into four groups (n = 10): a control and three experimental groups. Experimental gilts received basal diet supplemented with fumaric acid (4.0 g/kg of dry matter), dipromonium (0.4 g/kg) or vitamin C (0.1 g/kg) from 1 to 20 d of lactation. The animals of the control group did not receive the indicated preparation. The use of additives contributed to an increase in the milk yield of pigs, the viability of piglets and their growth rate by 21.1-30.0% (P<0.05), 6.0-6.6 and 10.0-27.9%, respectively, as well as influenced the morphological, biochemical and immunological parameters of the blood of pigs and their progeny.

The article presents the results of research on the realization of the adaptive, productive and reproductive potential of pigs by immunoprophylaxis of transport stress with Pigstim preparations. The transport stress prevention for replacement gilts with immunotropic drugs PigStim-C and PigStim-M contributed to their adaptive and reproductive potential realization by reducing the age of first insemination by 7.7-9.0 days and increasing its fertility, increasing the number of liveborns by 6.8-8.5% and reducing the number of stillborn piglets by 50 and 25%, increasing the viability by 1.72-3.32% and growth rate of piglets during the suckling period by 2.9- 4.0% and reducing the weaning-to-insemination period by 6.4 and 8.5%. The immunoprophylaxis of transport stress in weaned pigs ensured their adaptive and productive potential in long-term growing completion and store feeding period by increasing the live weight of stores by the end of growing completion by 1.66 and 2.55 kg and feeding period by 1.23 and 3.17 kg, reducing the incidence by 5.0 and 4.0% and increasing the viability of the livestock by 2.0%, increasing the effectiveness of therapeutic measures.

Gastrointestinal and respiratory diseases of young farm animals account for the largest percentage of all diseases. Currently, vaccines have been developed and successfully used for the specific prevention of diseases of infectious etiology, but it is not always possible to develop immunity of sufficient intensity, since vaccination without immunostimulation does not contribute to sufficient antibody formation. One of the important tasks of practical veterinary medicine was to find environmentally safe immunocorregulating substances that do not have a suppressive effect on the body. It was established that the drug ferran activated hematopoietic reactions of the body. Ferran in combination with enterozyme restores immunopoiesis and erythropoiesis to the indicators of physiological norms. The combined use of enterozyme with propolis hasda high immunostimulating effect, enhanced the productive phase of the immune response, removed the suppressive effect of the vaccine and increased the factors of natural and colonization resistance of the intestine.