DEVELOPMENT OF A POLYMERIC COMPOSITION FOR ANTIMICROBIAL AND WATER-RESISTANT COTTON FABRICS

The paper discusses the development of a new polymer composition based on polyvinylpirrolidone (PVP), benzoic acid and polyvinyl acetate for the antimicrobial and hydrophobic finishing of cotton fabric. The advantage of applying a new composition is the availability of the drugs used , as well as simplicity of the technological process - the finishing is carried out on any drying and tentering machine aggregated with padding machine, combining drying and heat treatment. The developed effective composite material is relatively inexpensive, environmentally friendly, and resistant to wet treatments. The study found that the resistance of the treated tissue to biodegradation, compared with untreated increases by 1.5 times, as evidenced by the growth of this indicator to 102%. It was also revealed that the proposed method of finishing at the same time provides an increase in the abrasion resistance of the fabric by 1.6-2.2 times, and a breaking load by 1.1-1.3 times

Averaging method and two-sided bounded solutions on the axis of systems with impulsive effects at non-fixed times

The averaging method, originally offered by Krylov and Bogolyubov for ordinary differential equations, is one of the most widespread and effective methods for the analysis of nonlinear dynamical systems. Further, the averaging method was developed and applied for investigating of various problems. Impulsive systems of differential equations supply as mathematical models of objects that, during their evolution, they are subjected to the action of short-term forces. Many researches have been devoted to non-fixed impulse problems. For these problems, the existence, stability, and other asymptotic properties of solutions were studied and boundary value problems for impulsive systems were considered. Questions of the existence of periodic and almost periodic solutions to impulsive systems also were examined. In this paper, the averaging method is used to study the existence of two-sided solutions bounding on the axis of impulse systems of differential equations with non-fixed times. It is shown that a one-sided, bounding, asymptotically stable solution to the averaged system generates a two-sided solution to the exact system. The closeness of the corresponding solutions of the exact and averaged systems both on finite and infinite time intervals is substantiated by the first and second theorems of N.N. Bogolyubov

RESEARCH OF CONSUMER PROPERTIES OF NON-WOVEN MATERIALS FROM WASTES OF WOOL-PROCESSING INDUSTRIES

Disposal of continuously accumulated household and industrial wastes of production and consumption is an acute environmental and economic problem. In this regard, scientific research in the field of waste recycling and analysis of its reuse in production are becoming highly topical. The article examines the consumer properties of needle-punched non-woven materials from waste processing fibers of wool and cotton, as well as to establish the optimal fibrous composition were developed experimental samples of non-woven fabrics with different percentage ratio of fibers. The studied samples of non-woven fabrics were developed by the method of needling of canvases produced from waste of wool and cotton spinning and processing industries

Determination of the degree of shedding with the mechanical method of oilseed flax stalks

The article provides statistics on the cultivation of oilseed flax in Kazakhstan. A study was carried out on the shedding of flax fibers by mechanical methods on a crushing machine. The degree of shedding after several transitions is determined. The practical value of the study is the production of elementary fibers by mechanical cracking, which contributes to the production of high-quality fibers suitable for spinning.The linear density reduction reaches 80% compared to the raw material

A problem with parameter for the integro-differential equations

The article proposes a numerically approximate method for solving a boundary value problem for an integro-differential equation with a parameter and considers its convergence, stability, and accuracy. The integro-differential equation with a parameter is approximated by a loaded differential equation with a parameter. A new general solution to the loaded differential equation with a parameter is introduced and its properties are described. The solvability of the boundary value problem for the loaded differential equation with a parameter is reduced to the solvability of a system of linear algebraic equations with respect to arbitrary vectors of the introduced general solution. The coefficients and the right-hand sides of the system are compiled through solutions of the Cauchy problems for ordinary differential equations. Algorithms are proposed for solving the boundary value problem for the loaded differential equation with a parameter. The relationship between the qualitative properties of the initial and approximate problems is established, and estimates of the differences between their solutions are given

Значение применения кредитного механизма в коммерческих банках Казахстана

В статье анализируются различные подходы к определению кредитного механизма, проводится исследование его сущности и структуры. Установлено, что кредитный механизм в условиях рыночной экономики является важным инструментом влияния на процесс расширенного воспроизводства и движущей силой стимулирования производства

TRACKING OF NON-STANDARD TRAJECTORIES USING MPC METHODS WITH CONSTRAINTS HANDLING ALGORITHM

In recent decades, a Model-Based Predictive Control (MPC) has revealed its dominance over other control methods such as having an ability of constraints handling and input optimization in terms of the value function. However, the complexity of the realization of the MPC algorithm on real mechatronic systems remains one of the major challenges. Traditional predictive control approaches are based on zero regulation or a step change. Nevertheless, more complicated systems still exist that need to track setpoint trajectories. Currently, there is an active development of robotics and the creation of transport networks of movement without human participation. Therefore, the issue of programming the given trajectories of vehicles is relevant. In this article, authors reveal the alternative solution for tracking non-standard trajectories in spheres such as robotics, IT in mechatronics, etc., that could be used in self-driving cars, drones, rockets, robot arms and any other automized systems in factories. The ability of Model-Based Predictive Control (MPC) such as the constraints handling and optimization of input in terms of the value function makes it extremely attractive in the industry. Nevertheless, the complexity of implementation of MPC algorithm on real mechatronic systems remains one of the main challenges. Secondly, common predictive control algorithms are based on the regulation approach or a simple step shift. However, there exist systems that are more complicated where a setpoint to be tracked is given in the form of trajectories. In this project, there were made several modifications in order to improve an MPC algorithm to make better use of information about the trajectories

Device for determining frictional properties of fibers

This article describes instruments for measuring the forces involved in the sliding process during friction of the thread and the forces between the fibers during drawing. A device was developed for measuring the friction forces between fibers based on electric strain gauges and processing their data on a computer. On the device both static and dynamic values of the friction coefficients can be measured. The use of the device I production will make it easy to select lubricants to optimize the processes of drawing textile materials and improve the quality of products by increasing the uniformity of the tape, rovings and yarn