scholarly journals ТЕРМІЧНИЙ ОПІР ХУТРЯНОГО ОДЯГУ

2021 ◽  
pp. 41-47
Author(s):  
С. І. Мойсеєнко ◽  
С. В. Донченко ◽  
А. І. Кулішова
Keyword(s):  
Thermal Resistance ◽  
Red Fox ◽  
Thermal Protection ◽  
Experimental Studies ◽  
Information Support ◽  
Total Thermal Resistance ◽  
Information Base ◽  
Heat Shielding ◽  
Fur Animals ◽  
Available Information

Improving the process of forecasting thermal protection of clothing by expanding the information base of thermophysical indicators of fur, namely its thermal resistance. Methodology. To achieve this goal, an experimental method has been applied to study the thermal resistance of clothes by indirectly measuring and simulating heat transfer of the human body with the environment at various temperatures without using a climate chamber.Results. The paper analyzes the existing information base for the thermophysical parameters of the fur of diff erent animals, as a result of which it was found that the available information is not suffi cient to predict the thermal protection of clothing. The subject of the study was selected fur animals that are in greatest demand among consumers in Ukraine. Experimental studies of the thermal conductivity of fur vests were carried out as a result of which their thermal resistance was determined. It has been established experimentally that the thermal resistance of the fur of a long-haired rabbit is 0,1 °C m 2 /W more than that of a red fox. As a result of experimental studies, it was found that the total thermal resistance of red fox fur and long-haired rabbit is in the range of 0,471 to 0,559 °C m 2  / W.  For the fi rst time, the thermal resistance of vests made of long-haired rabbit and red fox fur was determined taking into account the anatomical reliefs of the human torso. The existing methodology for determining the thermal resistance of garments on the simulated thermal stand of a human torso (ITSHB) to determine the thermal resistance of fur products has been adapted. Practical signifi cance. Extension of information support for the process of forecasting the heat-shielding properties of fur clothing. Reducing material costs for researching the thermal resistance of fur products.

scholarly journals MATHEMATICAL MODELING OF DESTRUCTION OF FIBERGLASS-BASED THERMAL-PROTECTION MATERIAL

2020 ◽  
pp. 71-78
Author(s):  
D.Ya. Barinov ◽  
◽  
P.S. Marakhovskij ◽  
A.V. Zuev ◽  
◽  
...  
Keyword(s):  
Thermal Protection ◽  
Experimental Studies ◽  
Thermophysical Characteristics ◽  
Capsule Type ◽  
Typical Trajectory ◽  
Material Sample ◽  
Heat Shielding ◽  
Physical And Mathematical Models ◽  
The Mathematical Model ◽  
Shielding Material

The paper proposes physical and mathematical models of heat and mass transfer in fiberglass used as a destructive heat-shielding material for capsule type descent vehicles. To provide the mathematical model with the initial data, experimental studies of the thermophysical characteristics of the material and the kinetic parameters of destruction have been carried out. There has been made a simulation of the destruction of a material sample during descent in the Earth's atmosphere along a typical trajectory for various areas of the heat shield; as a result, the dependences of temperatures on the flight time and the depth of the coked layer have been determined.

scholarly journals Heat Engineering Heterogeneity Of The Outer Walls Of Earthquake-Resistant Buildings

2020 ◽  
Vol 02 (12) ◽  
pp. 1-8
Author(s):  
Shipacheva E.V. ◽  
◽  
Pirmatov R. Kh. ◽  
Turdalieva M.K. ◽  
◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Thermal Protection ◽  
Experimental Studies ◽  
Heat Fluxes ◽  
Heat Engineering ◽  
Earthquake Resistant ◽  
Aerated Concrete ◽  
Shielding Properties ◽  
Heat Shielding ◽  
Concrete Elements

When assessing the level of energy efficiency of civilian buildings, a special place is given to establishing the level of thermal protection of their external enclosing structures. Significant discrepancies in the results of theoretical and experimental studies of heat fluxes through the outer walls of buildings erected in seismic areas are associated with the design features of fences - the presence of reinforced concrete elements in them: anti-seismic belts at the level of floors, cores at intersections of walls and along the edges of large window openings ... In addition, in recent years, external walls have become widespread, which are filling of bricks or aerated concrete blocks between the main structural elements of the frame - monolithic reinforced concrete columns and crossbars. The introduction of reinforced concrete elements into the structure of the external wall fencing provides strength, rigidity and stability of buildings, guarantees its seismic resistance. At the same time, reinforced concrete inclusions are significant “cold bridges” in warmer brick or aerated concrete masonry. Such heat engineering heterogeneity of earthquake-resistant outer walls significantly complicates the process of determining their heat-shielding properties. This, in turn, leads to errors in the design of heating systems, which inevitably affects the thermal comfort of the premises, the formation of condensation and mold zones in the cold zones of the inner surface of the fences. The article presents the results of theoretical and experimental studies to determine the heat-shielding properties of external heat-engineering heterogeneous walls of earthquake-resistant buildings. The most reliable method for calculating the reduced resistance to heat transfer of an inhomogeneous external structure and the coefficient of its thermal inhomogeneity have been established.

scholarly journals INVESTIGATION OF THE INFLUENCE OF THERMAL AND CLIMATE EFFECTS ON THE PERFORMANCE OF TILED THERMAL PROTECTION OF SPACECRAFT

2019 ◽  
Vol 16 (33) ◽  
pp. 657-667
Author(s):  
L. N. RABINSKIY ◽  
O. V. TUSHAVINA
Keyword(s):  
Mathematical Model ◽  
Thermal Protection ◽  
Experimental Studies ◽  
Climatic Conditions ◽  
Shear Stresses ◽  
Shear Forces ◽  
Sufficient Degree ◽  
And Performance ◽  
Heat Shielding ◽  
The Impact

The article discusses the thermal protection of spacecraft under various types of thermal and climatic influences. During the pre-launch preparation, several types of icing are possible on the surface of the tiled structure, consisting of quartz heat-shielding tiles. It is very important in the process of operation, to determine normal and shear stresses during icing and the impact of ice formed in the tile gaps. It is necessary to calculate the strength and performance of the tiled thermal protection in active stages of flight of spacecraft. A mathematical model was constructed that allows, with a sufficient degree of accuracy, to research the tiled structure for strength, shear and tearing of the tile when exposed to ice. Calculations for strength, shear, and tearing of tiles under the influence of ice were performed. Theoretical and experimental studies were compared. The performed calculations made it possible to show that the tile will not collapse under the considered load. The strength of the substrate withstands the emerging shear forces. The values of the adhesion strength of ice appearing on the surface of quartz fiber heat-protective coating were obtained. It was demonstrated that the proportion of tangents in the stressed state of the tile does not exceed 10%. The proposed mathematical model for studying the characteristics of the tiled thermal protection of a spacecraft adequately describes the processes under study. Experimental studies have shown satisfactory agreement with theoretical results. The calculations performed to determine the ultimate shear stresses in the substrate showed that the strength of the substrate withstands the emerging shear forces. Consideration of climatic conditions can significantly reduce risks in the design of thermal protection of modern aircraft. The results of this study can be used in further studies, and they can also be taken into account in the construction of aircraft.

scholarly journals ERGONOMIC PROPERTIES OF THE SEMI-FINISHED SHORT HAIRY RABBIT FUR PRODUCT

2020 ◽  
Vol 49 (3) ◽  
pp. 3-5
Author(s):  
О. А. Strepetova ◽  
M. V. Gorbacheva ◽  
T. V. Reusova
Keyword(s):  
Moisture Content ◽  
Thermal Resistance ◽  
Thermal Protection ◽  
Total Thermal Resistance ◽  
Content Index ◽  
Rex Rabbit ◽  
Skin Samples

The article is dedicated to the study of the ergonomic properties of the semi-finished short-haired rabbit fur, which determine the technological possibilities of fur. It is shown that the semi-finished rabbit of rex breed of colour castor and chinchilla has equal resistance to moisture when wet, which is indicated by the moisture content index. When testing hygroscopicity, it is established that the skin samples with hair are less hydrophilic than those without it; by 12,5 %, in the rabbit skins of the rex castor breed, and by 13,8 %, in the skins of the rabbit of rex chinchilla breed. The total thermal resistance of a semi-finished rex rabbit product exceeds the value of the feature of 0,210 m2 ·ºC/W, which makes it one of the group of semi-finished fur products with high thermal protection properties. The established indicators of ergonomic properties of a semi-finished rex rabbit product should be taken into account when choosing semi-finished products and creating furs of different designs and silhouettes.

CREDO RADON UA – INFORMATION MODEL FOR CALCULATION OF ROAD CONSTRACTION

2019 ◽  
pp. 34-42
Author(s):  
Volodymyr Karedin ◽  
Nadiya Pavlenko
Keyword(s):  
Design Process ◽  
Static Loading ◽  
Computer Aided Design ◽  
Experimental Studies ◽  
Construction Materials ◽  
Residual Deformation ◽  
Road Construction ◽  
Information Support ◽  
Existing Structures ◽  
Road Pavement

CREDO RADON UA software provides an automated calculation of the strength of the pavement structures of non-rigid and rigid types, as well as the calculation of the strengthening of existing structures. In the article, one can see the main features and functionality of the CREDO RADON UA software, the main points in the calculations according to the new regulations. Information support of the design process includes necessary databases, informational and helping materials that make up the full support of the pavement design process. The concept of CREDO RADON UA 1.0 software is made on the use of elasticity theory methods in calculations of initial information models of pavements. Performing optimization calculations, the roadwear in CREDO RADON UA is designed in such a way that no unacceptable residual deformation occurs under the influence of short-term dynamic or static loading in the working layer of the earth bed and in the structural layers during the lifetime of the structure. The calculation algorithms were made in accordance with the current regulatory documents of Ukraine. CREDO RADON UA software allows user to create information bases on road construction materials and vehicles as part of the traffic flow for calculations. The presented system of automated modeling makes it easier for the customer to control the quality of design solutions, to reasonably assign designs to layers of reinforcement, to quickly make comparisons of calculations of different designs for the optimal use of allocated funds. Prospects for further improvement of the program should be the results of theoretical and experimental studies on filling the databases, which are used as information support for automated design of road structures. Keywords: CREDO RADON UA, road, computer-aided design, repair project, road pavement, strengthening, construction, rigid pavement, elasticity module, a transport stream, calculation method, information support, dynamic or static loading.

Analysis of Information Support for the Condition of Soil Resources in Ukraine

2015 ◽  
Vol 2 (2) ◽  
pp. 77-84 ◽  
Author(s):  
S. Baliuk ◽  
V. Solovey ◽  
M. Zakharova ◽  
A. Kucher ◽  
S. Truskavetskyi
Keyword(s):  
Soil Cover ◽  
Sustainable Land Use ◽  
Information Support ◽  
Land Resources ◽  
Soil Resources ◽  
Diffi Cult ◽  
Other Information ◽  
Global Soil ◽  
Individual Type ◽  
Available Information

The contemporary condition of soil cover in Ukraine is characterized. The attention is focused onto widespread degradation processes in soils. The causes that determine the development of these negative processes are considered. The contemporary informational support for the condition of soil cover in Ukraine is estimated. In general, the current available information is of narrow-departmental nature, obtained by different methods and non-correlated monitoring programs. As a rule, it is stored in under-structured databases, incompatible with other information systems; mainly recorded on paper media unusable with modern technologies, whereby such information resources are diffi cult to be compiled together. These disadvantages are strong constraints against consistent usage of materials for evaluation, forecast and management of changes in the soil cover. The Soil Observation program should thereby be combined with Agrochemical Passportization and ecology-ameliora- tive monitoring; in other words, the application of innovative soil-agrochemical methodology is considered. Each individual type of surveys shall complement the others, and taken altogether, they shall constitute a con- sistent Information System, capable of solving the problems of assessing the condition, forecasting, manage- ment, usage and protection of soil resources. The monitoring procedures should be conducted on the basis of a new soil concept in line with unifi ed programs and methods, so as to meet European approaches to the maxi- mum extent. Such a technical composition enables getting information on present-day processes in soils, and is the only combination that actually helps us to “ecologize” our knowledge of soils, which is the leading trend in the scope of global soil-science. Thus obtained results will serve as a State-owned tool which would subse- quently facilitate the use and protection of soil resources all over the country, to be involved in a united global soil-information scope. The attention is focused onto social signifi cance of the information on soils and their fertility in terms of land resources optimization, as well as the formation of sustainable land use in Ukraine.

Combined Microstructure and Heat Transfer Modeling of Carbon Nanotube Thermal Interface Materials1

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Sridhar Sadasivam ◽  
Stephen L. Hodson ◽  
Matthew R. Maschmann ◽  
Timothy S. Fisher
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Finite Volume ◽  
Pressure Dependence ◽  
Matrix Material ◽  
Three Dimensional ◽  
Coarse Grain ◽  
Total Thermal Resistance ◽  
Thermal Interface ◽  
Cnt Arrays

A microstructure-sensitive thermomechanical simulation framework is developed to predict the mechanical and heat transfer properties of vertically aligned CNT (VACNT) arrays used as thermal interface materials (TIMs). The model addresses the gap between atomistic thermal transport simulations of individual CNTs (carbon nanotubes) and experimental measurements of thermal resistance of CNT arrays at mesoscopic length scales. Energy minimization is performed using a bead–spring coarse-grain model to obtain the microstructure of the CNT array as a function of the applied load. The microstructures obtained from the coarse-grain simulations are used as inputs to a finite volume solver that solves one-dimensional and three-dimensional Fourier heat conduction in the CNTs and filler matrix, respectively. Predictions from the finite volume solver are fitted to experimental data on the total thermal resistance of CNT arrays to obtain an individual CNT thermal conductivity of 12 W m−1 K−1 and CNT–substrate contact conductance of 7 × 107 W m−2 K−1. The results also indicate that the thermal resistance of the CNT array shows a weak dependence on the CNT–CNT contact resistance. Embedding the CNT array in wax is found to reduce the total thermal resistance of the array by almost 50%, and the pressure dependence of thermal resistance nearly vanishes when a matrix material is introduced. Detailed microstructural information such as the topology of CNT–substrate contacts and the pressure dependence of CNT–opposing substrate contact area are also reported.

scholarly journals Information and analytical support as an element of organization of economic security of entrepreneurial activity

2021 ◽  
pp. 77-81
Author(s):  
Є.В. Воронюк
Keyword(s):  
Organizational Structure ◽  
Organizational Support ◽  
Economic Security ◽  
Information Support ◽  
Entrepreneurial Activity ◽  
Analytical Work ◽  
Effective System ◽  
Analytical Research ◽  
Definition Of ◽  
Available Information

The article describes the importance of information and analytical support for the formation of organizational support for economic security of business. The stages and principles of formation of information-analytical support for creation of system of economic safety of the enterprise are analyzed. The connection and the nature of the influence of information-analytical activity and organizational support of economic security of the enterprise are investigated. It is important for the management of each organization to develop an individual mode of working with information, especially at the stage of its accumulation and analysis. Only a detailed and step-by-step definition of the process of working with information resources of various departments and officials increases the effectiveness of organizational support of economic security of the enterprise. The quality of analytical support is the basis for building an effective system of economic security of the enterprise and one of the key factors in its development. The harmonious combination of information-analytical work and the organization of economic security is a problem for the management of the business structure and requires a constant, operational study of the economic efficiency of the existing organizational structure.Adjusting the organizational structure directly affects the company's ability to withstand threats and risks from the external and internal environment. Modernity puts forward specific conditions for the economic security of the enterprise, especially given the deepening of the role and increase the amount of available information. The information array, which is freely available, is constantly replenished, which requires decision-makers to find new methods of information processing. The article analyzes the features of using the results of information support and analytical research to form an effective organizational structure of economic security of the enterprise. The study demonstrates the need for reliable and effective information and analytical support to improve the organizational support of economic security of the enterprise.

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