Kyiv National University of Construction and Architecture

www.knuba.edu.ua
Kiev, Ukraine

The Kyiv National University of Construction and Architecture — better known under its former name Kyiv Civil Engineering Institute — is the largest and most important building and architectural university of Ukraine located in the nation's capital Kiev. Post address: Kiev, Povitroflotsky Avenue, 31, 03680 Wikipedia.

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Bondar R.P.,Kyiv National University of Construction and Architecture | Podoltsev A.D.,NASU Institute of Electrodynamics
Technical Electrodynamics | Year: 2017

The complex model with frequency-dependent parameters for calculation of electrodynamic shaker operating characteristics is offered. The parameters of an equivalent circuit of the device model are depended on frequency that provides increase of calculation accuracy. The influence of frequency on parameters of the electrodynamic shaker is researched with help of numerical field model. On the basis of the presented equivalent circuit, characteristics of the vibrator depending on frequency are calculated. The problem of calculation of operating characteristics by means of the complex model based on the equations of an electromagnetic field, electric and electromechanical circuits is solved.


Sakharov V.O.,Kyiv National University of Construction and Architecture
Advances in Mechanics: Theoretical, Computational and Interdisciplinary Issues - 3rd Polish Congress of Mechanics, PCM 2015 and 21st International Conference on Computer Methods in Mechanics, CMM 2015 | Year: 2016

The study contains results of the numerical analysis of the seismic impact on massive constructions using Zymne Monastery Cathedral building as an example. The cathedral has been founded in X-XI century AD using mostly brickwork. Due to the numerous destructions, reconstructions, change of ownership through history between Poland, Soviet Union and Ukraine, the cathedral has a complex configuration and is now in the immediate need of strengthening its foundation. Simulation has been performed using FEM with modified explicit central difference method in the nonlinear formulation. The calculations involved a soil model that takes into account visco-elastic-plastic deformation properties, structural strength and water pressure in soil pores. The study also contains an analysis of the influence of nonlinear orthotropic properties of the brick masonry on the stress-strain state of the building and the estimation of the dynamic behaviour of the cathedral structures. It demonstrates the distribution of stress concentration zones and locations of the localized structural damage. Finally, it contains an analysis of the accumulated plastic deformations in the soil base that leads to an uneven foundation settlement and the estimations how water pressure in the soil pores affected the above-mentioned processes. © 2016 Taylor & Francis Group, London.


Tsapko Y.,Kyiv National University of Construction and Architecture | Tsapko A.,National University of Life and Environmental Sciences of Ukraine
EasternEuropean Journal of Enterprise Technologies | Year: 2017

Description of the behavior of fireproof means and coatings, including those swelling, in the moment of the formation of a thermal insulating structure is a special and complex task. In general, it covers both stages of the process of thermal protection: both heat transfer and subsequent swelling of the coating, which is formed during fire protection. In necessitates studying conditions for the formation of barrier to thermal conductivity and the establishment of a mechanism of fire protection from layer to a layer of coke. Given this, we examined the process of fire protection with work of an impregnating solution and at swelling of a fireproof coating. Data that we obtained revealed that the formation of volatile products under the effect of coating at high temperature occurs with the formation of noncombustible substances. We established experimentally that under the action of heat flow on the fireproof samples, intense release of inert gases occurs, as well as a reduction in the combustible, which leads to the effectiveness of fire protection in reverse order. It was found in the course of conducted tests that the intensity of the formation of noncombustible gases shifts toward elevated temperature with the formation of coked cellular material. Results of determining a swelling capacity of coating for the intumescent system demonstrated that under the influence of high-temperature flow, material combustion and weight loss of the coating is reduced by more than twice due to the formation of high-temperature compounds; in this case, the time to reach a limit temperature grows as well. A coating under the influence of high temperature forms a significant coefficient of swelling, contributes to the formation of a thermal insulating layer of coke, which prevents wood from burning, as well as the passage of high temperature to the material. In general, the efficiency of wood fire protection revealed that the goods belong to the materials that are difficult to combust, which spread the flame over surface slowly and with low smokegenerating capacity. © Y. Tsapko, A. Tsapko, 2017.


Kryvomaz T.,Kyiv National University of Construction and Architecture | Stephenson S.L.,University of Arkansas
Nova Hedwigia | Year: 2017

The myxomycetes (plasmodial slime molds or myxogastrids) are likely to be affected by climate change, since temperature and moisture are the main factors limiting their occurrence in nature. However, the resilience of myxomycetes to climate change is extremely difficult to determine due to their cryptic life history. It is possible that myxomycetes may represent one of the least affected groups of organisms, although all available evidence suggests that the anticipated changes in climate regimes are going to have a significant impact upon their distribution and ecology. This will be especially true for those species of myxomycetes restricted to particular types of microhabitats (e.g., alpine snowbanks) or which are confined to geographical areas that are limited in extent (e.g., small oceanic islands). The composition of assemblages of myxomycetes species associated with deserts, the polar regions and other ecosystems of the world also could be affected. © 2016 J. Cramer in Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, Germany.


Shults R.,Kyiv National University of Construction and Architecture
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2017

The problem of accuracy determination of the UAV position using INS at aerial photography can be resolved in two different ways: modelling of measurement errors or in-field calibration for INS. The paper presents the results of INS errors research by mathematical modelling. In paper were considered the following steps: developing of INS computer model; carrying out INS simulation; using reference data without errors, estimation of errors and their influence on maps creation accuracy by UAV data. It must be remembered that the values of orientation angles and the coordinates of the projection centre may change abruptly due to the influence of the atmosphere (different air density, wind, etc.). Therefore, the mathematical model of the INS was constructed taking into account the use of different models of wind gusts. For simulation were used typical characteristics of micro electromechanical (MEMS) INS and parameters of standard atmosphere. According to the simulation established domination of INS systematic errors that accumulate during the execution of photographing and require compensation mechanism, especially for orientation angles. MEMS INS have a high level of noise at the system input. Thanks to the developed model, we are able to investigate separately the impact of noise in the absence of systematic errors. According to the research was found that on the interval of observations in 5 seconds the impact of random and systematic component is almost the same. The developed model of INS errors studies was implemented in Matlab software environment and without problems can be improved and enhanced with new blocks.


Shults R.,Kyiv National University of Construction and Architecture
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2017

In the paper, the questions of using the technologies of low-cost photogrammetry in combination with the additional capabilities of modern smartphones are considered. The research was carried out on the example of documenting the historical construction of the II World War -The Kiev Fortified Region. Brief historical information about the object of research is given. The possibilities of using modern smartphones as measuring instruments are considered. To get high-quality results, the camera of the smartphone was calibrated. The calibration results were used in the future to perform 3D modeling of defense facilities. Photographing of three defense structures in a different state: destroyed, partially destroyed and operating was carried out. Based on the results of photography using code targets, 3D object models were constructed. To verify the accuracy of the 3D modelling, control measurements of the lines between the code targets at the objects were performed. The obtained results are satisfying, and the technology considered in the paper can be recommended for use in performing archaeological and historical studies.


Yerukayev A.,Kyiv National University of Construction and Architecture
Modern Problems of Radio Engineering, Telecommunications and Computer Science, Proceedings of the 13th International Conference on TCSET 2016 | Year: 2016

A model that determines the influence of the factors to urban regions for housing construction is under consideration is proposed in this report. For disclosure of the influence process the technology is used, which is based on fuzzy sets and which is extended to type-2. The basic theoretical aspects are described using sets and graphs that are elucidated in soft computing format. © 2016 National University Lviv Polytechnic.


Moskalenko O.,Kyiv National University of Construction and Architecture | Runova R.,Kyiv National University of Construction and Architecture
Materials Science Forum | Year: 2016

The connection with the icing on the frost resistance of concrete containing slag cement and chemical additives “MC Bauchemie” under freezing and thawing. It is shown that freeze concrete samples at (-) 10°C increase in the amount of slag from 30 to 70 wt.% Of binder in the composition leads to an increase in the index of ice formation in the concrete of 1.7…1.9 times compared with the concrete obtained at a slag containing slag cement with a content of 10 wt.%. Frost resistance of concrete is reduce from F450 to F400. When freezing of concrete samples at (-) 20°C increase in the amount of slag from 30 to 50 wt. % binder in the composition leads to an increase in the index of ice formation in the concrete of 1.7 times compared with the concrete obtained on slag cement containing slag with a content of 10 wt.%. Frost resistance of concrete is reduce from F400 to F350. The concrete on the slag containing cement with slag 70 wt. % is observed a slight decrease in ice formation. However, its value is 1.4 times higher than ice formation in concretes containing slag in an amount of 10 wt. %. Mark on frost resistance remains at F350. The smallest ice formation, regardless of the content of the slag into the slag containing cement, concrete characterized in that use complex organo-mineral supplement SX (5%) + SP (0.6%) in the amount of 5.6%. According to the degree of influence of additives used to reduce ice formation in the slag in concretes, containing cements can be ranker number: SX (5%) + SP (0.6%) > NC (5%) + SP (0.6%) > SP (0.6%). © 2016 Trans Tech Publications, Switzerland.


Kravchenko I.,Kyiv National University of Construction and Architecture | Luhmann T.,University of Oldenburg | Shults R.,Kyiv National University of Construction and Architecture
International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences - ISPRS Archives | Year: 2016

For the preparation of modern specialists in the acquisition and processing of three-dimensional data, a broad and detailed study of related modern methods and technologies is necessary. One of the most progressive and effective methods of acquisition and analyzing spatial data is terrestrial laser scanning. The study of methods and technologies for terrestrial laser scanning is of great importance not only for GIS specialists, but also for surveying engineers who make decisions in traditional engineering tasks (monitoring, executive surveys, etc.). The understanding and formation of the right approach in preparing new professionals need to develop a modern and variable educational program. This educational program must provide effective practical and laboratory work and the student's coursework. The resulting knowledge of the study should form the basis for practical or research of young engineers. In 2014, the Institute of Applied Sciences (Jade University Oldenburg, Germany) and Kyiv National University of Construction and Architecture (Kiev, Ukraine) had launched a joint educational project for the introduction of terrestrial laser scanning technology for collection and processing of spatial data. As a result of this project practical recommendations have been developed for the organization of educational processes in the use of terrestrial laser scanning. An advanced project-oriented educational program was developed which is presented in this paper. In order to demonstrate the effectiveness of the program a 3D model of the big and complex main campus of Kyiv National University of Construction and Architecture has been generated.


Udod V.M.,Kyiv National University of Construction and Architecture | Yatsiv M.Y.,Kyiv National University of Construction and Architecture
Journal of Water Chemistry and Technology | Year: 2013

Modern ecological control methods of the state of hydro-ecosystems of river basins have been developed for ensuring their sustainable development, assessment of self-recovery properties of aquatic ecosystems that are a reflection of intra-water-body processes. For the first time ever the index of hydro-ecosystem development was proposed for conducting the ecological control of such systems. © 2013 Allerton Press, Inc.

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