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STUDY OF THE INFLUENCE OF COMPOUNDS OF THE ANO3 and ANO3 nH2O TYPES ON RHEOKINETIC AND COLLOID-CHEMICAL PROPERTIES OF ALUMINOSILICATE ADHESIVES FOR WOOD
Get PDFIn the technology of gluing solid wood, various adhesives are used, which, in addition to ensuring the strength of the gluing, must also be characterized by a number of rheological and colloidal-chemical properties, namely: have acceptable viscosity, low contact angles, have good spreading and enveloping ability, penetrate deep into the wood , providing reliable cohesive-adhesive contact and much more. Today, adhesives based on PVA dispersions and urea formaldehydes are used, the properties of which have been sufficiently studied and tested in practice. An alternative to organic-based adhesives is mineral adhesives, in particular aluminosilicate adhesives, which are non-flammable and have high mechanical strength.
Object of research: rheokinetic patterns and processes of formation of colloidal-chemical structures of aluminosilicate adhesives modified with compounds of the ANO3 and ANO3×nH2O type.
Investigated problem: Considering that aluminosilicate adhesives are multiphase reactive suspensions, the viscosity of which changes over time and affects their viability, the issue of viscosity stabilization due to the introduction of electrolyte salts into their composition is relevant, and will also contribute to improving the wettability and spreading of the adhesive during applying them to substrates and gluing samples from various types of wood.
Main scientific results: The effect of the concentrations of compounds of the ANO3 and ANO3×nH2O type on the rheokinetic and chemical-colloidal properties of the aluminosilicate adhesive has been established, which will make it possible to use aluminosilicate adhesives in practice for gluing wood of various species, as well as to work out possible technological methods of their application, taking into account the obtained data on the viscosity, wetting and spreadability of the modified adhesive on the surface of the wood substrate.
Area of practical use of the research results: woodworking enterprises for the production of glued solid wood products.
Innovative technological product: aluminosilicate adhesives modified with ANO3 and ANO3×nH2O nitrate additives for gluing wood of various species.
Scope of application of an innovative technological product: the application of these approaches will make it possible to obtain glued materials from wood from different species with improved technological and physical and mechanical properties of the glue seam and, accordingly, to increase the quality and reliability of products
BONE-CEREBRAL CHANNEL REAMING IN THE TREATMENT OF LIMBS BONE FRACTURES
Get PDFThe object of the study: clinical effect of intramedullary blocking osteosynthesis of fractures of the bones of the extremities without reaming of the bone marrow canal.
The problem to be solved: determination of the influence of surgical technology of intramedullary blocking osteosynthesis of bone fractures without reaming of the bone marrow canal on the qualitative and anatomical and functional results of treatment.
Main scientific results. The term of fusion of bone fragments in complete groups (including all localizations) in the group of patients who underwent surgery with reaming of the bone marrow canal was 4.21±0.46 months, while in the group without reaming of the canal it was much shorter – 3.47±0.51 months
Faster functional recovery of the limbs was also observed in cases that precluded bone marrow reaming – 96 % of good and 4 % satisfactory scores were obtained (80 % good and 20 % satisfactory in bone marrow reaming).
The technology of closed intramedullary blocking osteosynthesis without reaming of the bone marrow can optimize the time of fusion of bone fragments and get 91 % good and 9 % satisfactory results. Its effectiveness is to reduce the number of satisfactory treatment results by 19 %, the absence of unsatisfactory and increase the share of good results by 23 %.
The area of practical use of research results: clinics of traumatological profile of different levels, in which surgical treatment of fractures of the bones of the extremities are done.
An innovative technological product: technology of closed intramedullary blocking osteosynthesis without reaming of the bone marrow canal.
The area of application of an innovative technological product: clinical practice of using the technology of closed intramedullary blocking osteosynthesis without reaming of the bone marrow canal
ADEQUACY EVALUATION OF THE SYNTHESIS OF MATHEMATICAL MODELS FOR ONE CLASS OF LINEAR DYNAMIC SYSTEMS WITH PARAMETERS, VARIABLE IN TIME AND IN SPACE
Get PDFThe object of research: the authors of this work have synthesized in previous publications a mathematical model of one class of linear dynamic systems with variable parameters in time and space, which includes the system for lifting and lowering a load with a crane in the case of taking into account the influence of longitudinal vibrations that arise in the cable of the lifting mechanism, and shift in time of the moment of inertia of the rotating masses reduced to the motor shaft.
Investigated problem: simulation models are synthesized in the Simulink graphical software environment of the MATLAB application package to assess the adequacy of the specified mathematical model. A calculation was carried out using the passport data and characteristics of all components of the crane structure to find the numerical values of the parameters of simulation models, including the electric motor, cable and gearbox.
The main scientific results: the results of modeling the dynamics of the electric drive system during acceleration, deceleration, the prevailing velocity are given. By comparing the results obtained on the simulation model with the results of experimental studies of the same class of dynamical systems carried out by other authors, the adequacy of the mathematical models synthesized by the authors of this work is proved. It is proved that the use of the classical equation of the dynamics of the electric drive system, which contains a constant moment of inertia and a constant moment of load, leads to errors in the estimates of the processes accompanying the lifting and lowering of loads by cranes. And this, in turn, does not allow predicting the behavior of the system in various operating modes with sufficient accuracy.
The area of practical use of the research results: enterprises of the machine-building industry, specializing in the production, modernization of lifting equipment.
Innovative technological product: a simulation model of a crane mechanism, which makes it possible to take into account the influence of longitudinal vibrations that arise in the cable of the hoisting mechanism, and the shift in time of the moment of inertia of the rotating masses reduced to the motor shaft.
Scope of application of the innovative technological product: design and development of control systems for electric drives of lifting equipment
SIMULATION OF THE RADIANT HEAT TRANSFER PROCESS IN THE ELEMENTS OF ROASTING EQUIPMENT
Get PDFThe object of the research is the process of radiation heat transfer, taking into account a single reflection of rays in the IR device of food production.
Investigated problem – the work is devoted to solving the problem of irregularity of radiation heat transfer during infrared roasting of food products.
Main scientific results. The inverse problem of heat transfer by radiation has been solved and a technique has been developed for determining the profiles of the ray flux reflectors for uniform irradiation of receivers of a convex section. Analytical modeling of all-round uniform irradiation of an elliptical receiver has been carried out. An experimental device with low-inertia temperature sensors for infrared roasting of semi-finished meat products has been developed, which makes it possible to use a reflector shaped according to the developed analytical technique. The verification of the created technique for determining the profiles of reflectors by means of a computer experiment using the TracePro and Mathcad software systems has been carried out.
The area of practical use of the research results: the use of an experimental device with a radiant flux reflector for roasting semi-finished meat products proves that the obtained technique for profiling reflectors of heat engineering systems is acceptable for the design of infrared equipment for food production and restaurant facilities. This technique allows simulating the profile of the radiant flux reflector depending on the shape of the receiver. Studies have shown that the use of a profiled reflector in the experimental device reduces the duration of roasting of natural portioned semi-finished beef products by 33 %.
Innovative technological product: a technique for determining the profiles of ray flux reflectors for uniform irradiation of receivers with a convex section. Device for infrared roasting of semi-finished meat products.
Scope of application of an innovative technological product. The study of an experimental device with a designed radiant flux reflector for roasting semi-finished meat products proves that the obtained technique for profiling reflectors of heat engineering systems is acceptable for the design of infrared equipment for food production and restaurant facilities. Using this approach allows to approach the solution of the problem of irregularity of irradiation of products during infrared roastin
DUAL-USE MATERIAL SCIENCE TECHNOLOGIES TRANSFER IN UKRAINE: PREMISES AND PRESENT CATCH-22
Get PDFThe object of effort is to assess the underpin premises of transfer of dual use materials science technologies appeared in Ukraine after the Independence and those developed until nowadays. It is also to shed a light on this issue and evaluate historical, technical, political, and mental barriers between technology supplier / recipient and future prospects and successful steps to be made to overcome those.
The work puts a problem to scrutinize today’s and future materials science dual use technology transfer control regulations and all premises associated and leaving an imprint on the realities existing in Ukraine. First of all, it is important to study technology transfer issues and a vital role of those premises appeared in Ukraine otherwise one may chase a ghost while trying to understand how to put it correct in a right legal and political way to successfully resolve this matter since in this case none turnkey solutions ever exist. For example, central to a control regime debate is to discuss an evolution, or lack of the existing transparent legislation covering dual-use technologies, and a discussion on its orientation and scope. Does this really work and sound in practice, and if “yes” then to what extent? Second, at a time of fundamental change in nature and order of international relations, the wisdom of ad hoc control regimes must not escape scrutiny. Although experts are very much aware of these problems, future of control regulations remains still blurred and uncertain, so what are their potential implications for international state’s security?
The research revealed that a reassessment of the problems surrounding dual use materials science technologies and today’s control regulations should be made – both in terms of their potential improvement and/or possible new universal multilateral agreements and transparency among states involved in technology transfer. This further argues a need for new international mechanisms to ensure the transfer of dual-use materials science technologies, while not powering proliferation opportunities for weapon systems.
The results of this endeavor make a ground floor for further debates in terms of politics and export control in the field of transfer of intangible technologies
METHODS OF MUSIC THERAPY AND EXPERIMENTAL STUDY OF BIOELECTRICAL ACTIVITY OF STUDENTS' BRAINS WHILE LISTENING TO THE MUSICAL COMPOSITION OF THE AUDIBLE FREQUENCY SPECTRUM
Get PDFThe object of the study. Experimental research of music therapy methods.
The problem to be solved. Determining the influence of selected musical composition of the audible frequency spectrum on the bioelectrical activity of students' brains, in particular alpha-, beta- and theta-rhythms.
Main scientific results. The dependence of the influence on the bioelectrical activity of the brain of the compositions of the three frequency bands both individually and the composition as a whole is revealed. The dependence of alpha, beta and theta rhythms is shown.
The area of practical use of the research results. Medical institutions specializing in the treatment of disorders of the central nervous system, organic brain damage, stress, and its effective psychological rehabilitation.
An innovative technological product. A technique of music therapy that allows to determine how different frequency ranges affect the bioelectrical activity of the human brain.
The area of application of an innovative technological product. Clinical practice of using a music therapy
IMPLEMENTATION OF RISK ASSESSMENT FOR CRITICAL INFRASTRUCTURE PROTECTION WITH THE USE OF RISK MATRIX
Get PDFThe object of research: risk assessment for critical infrastructure protection in Ukraine.
Investigated problem: adaptation and implementation of European Union’s approach to the risk assessment for critical infrastructure for the conditions of Ukraine.
The main scientific results: The most relevant types of threats of natural and man-made origin for the security of critical infrastructure in Ukraine are investigated. The adaptation and implementation of European Union’s approach to the risk assessment for critical infrastructure for the conditions of Ukraine is realized. For this the character of changes of natural and man-made emergencies in Ukraine in the context of impact on critical infrastructure is investigated. The risk of economic losses due to emergencies in Ukraine has been evaluated with the use of risk matrix, taking into account the adapted approach applied in the European Union.
Field of practical use of research results: Critical infrastructure facility including systems and physical or virtual resources that provide functions and services, failure of which can lead to significant negative consequences for society, social and economic development of the country and ensuring national security. Among them the most important are objects of electric-power industry, especially important objects of the oil and gas industry; units of the state government and local administration; objects of possible terrorist attacks; facilities subject to protection and defense in emergencies and during special periods; facilities subject to mandatory protection by the State Protection Service under contracts.
Innovative technology product: methodology for assessing threats and risks to critical infrastructure, which can greatly contribute to the development of measures to prevent and minimize the negative consequences of emergencies possible in Ukraine at critical infrastructure objects.
Scope of the innovative technology product: state system for critical infrastructure protection in Ukraine
RESEARCH OF THE RESONANCE PROPERTIES OF HELMHOLTZ RESONATORS
Get PDFThe object of research. Process of oscillation of the Helmholtz resonators.
Investigated problem. Differences between some formulas for the calculation of the resonant frequency of the Helmholtz resonator and the most accurate of them were established. The effect of acoustic design on the Helmholtz resonator frequency value and influence of the attached air mass between the neck of the Helmholtz resonator and free field were investigated.
The main scientific results. As a result of a numerical experiment, analytical ratios were obtained that allow obtaining the most accurate results. One of them is the most optimal for calculating the resonator resonant frequency in a free field, and in this case, less than 1 % inaccuracy level can be achieved, given that r/R<0.25. Other one allows to achieve the same low inaccuracy level for a resonator located in an acoustically rigid shield, given that r/R<0.25. Research has shown that the location of the resonator in an acoustically rigid shield leads to significant changes in natural resonance frequency value.
The area of practical use of the research results. The detailed research of previously unexplored properties of resonators will make it possible to improve the algorithms for the development of metamaterials, to discover additional parameters with which it is possible to control the characteristics of the metamaterial.
Scope of the innovative technological product. Such resonators are used as the basic elements in metamaterials, as structural elements of the sound-absorbing panels, in acoustic mufflers
ANALYSIS OF MAIN REQUIREMENTS FOR ELECTRONIC DOCUMENT MANAGEMENT SYSTEMS
Get PDFThis article discusses the document management of the enterprise, automation of "mechanical" document management, as well as advantages and disadvantages of electronic document management systems. Thus, the advantages of electronic document management systems include the following: saving time, more adequate use of physical space and technology. As well as increasing the transparency of the internal work of the enterprise, more flexibility with regard to the physical location of employees, improving the security of information and documents, reducing the cost of printing, postage stamps, envelopes and forwarding. In addition, the study transmitted the value of the document and its place in the company's office. The requirements of customers to electronic document management systems are also affected. In conclusion, we have reviewed the requirements for electronic document management systems and identified the main requirements for such systems. The main requirement of customers is financial costs. It is on them that depends on which modules of the electronic document management system will be preliminar
ORGANIZATION OF ENVIRONMENTAL MONITORING IN THE CASPIAN SEA
Get PDFThe object of research is ecological monitoring of the Caspian Sea. This article addressed the objectives and components of environmental monitoring. It also describes the objectives for the establishment of a Unified State Environmental Monitoring System. Special attention is paid to the structure of the environmental network monitoring system, which consists of three levels: low, medium and high.
One of the main problems is the establishment of the Unified State Environmental Monitoring System of the Caspian Sea. This article considered the main functions and objectives of the Unified State Environmental Monitoring System. Here are also discussed the computing center of the environmental monitoring system and its functions and components. The research used three main components for environmental data processing: database management systems, geographic information system and integrated software packages. Examples of a computer system of environmental monitoring include: ArcGIS, MapInfo, ArcView and OCEAN.
The main scientific results of this research are the main functions, objectives and components of environmental monitoring of the Caspian Sea to reduce pollution levels.
The obtained results can be used to optimize the characteristics of environmental information systems, which are used to organize environmental monitoring.
Innovative technological product of this research is the development of an algorithm for the organization of environmental monitoring of the Caspian Sea. It will allow ecologists to monitor the environmental situation of the Caspian Sea and further improve it.
The obtained innovative technological product will be useful for carrying out environmental monitoring of the most contaminated section of the water basin, and more precisely for monitoring the scale of pollution and further improving the environmental situation of the water area