Yerevan, Armenia

National University of Architecture and Construction of Armenia is a state university in Yerevan, Armenia. Wikipedia.


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Huang Z.,Yerevan State University of Architecture and Construction
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

As the key technology for sea-based target detection and recognition, sea-land segmentation directly effects the execution efficiency of target detection algorithm. Therefore we proposed an innovative sea-land segmentation method in this paper. Aiming at the problem of over-segmentation, we improved the graph-based image segmentation model based on difference in texture between sea and land. Firstly, by introducing the conception of average weight, we achieved the extraction of texture feature. Secondly, we redefined the difference between two components. Experiments results show the proposed method outperforms traditional sea-land segmentation approaches. © 2016 SPIE.


Fouda A.,Mansoura University | Melikyan Z.,Yerevan State University of Architecture and Construction
Energy | Year: 2010

Cooling load calculations are essential in sizing air conditioning system equipment. In designing energy, efficient and renewable energy sourced cooling systems for buildings, it is important to have the exact values of cooling loads and seasonal cooling demands of buildings. In this paper new assessment method for more precise determining of cooling loads and seasonal cooling demands of residential buildings are developed, which are necessary for right solutions of cooling efficiency problems. Comparing to the method of ASHRAE, example and other methods it provides more correct results. Application of suggested method provides better accuracy in assessment of cooling loads especially for seasonal aspects, as they take into account the impact of more factors. © 2010 Elsevier Ltd.


Fouda A.,Mansoura University | Melikyan Z.,Yerevan State University of Architecture and Construction
Applied Thermal Engineering | Year: 2011

In this paper heat and mass transfer, process in direct evaporative cooler is discussed. A simplified mathematical model is developed to describe the heat and mass transfer between air and water in a direct evaporative cooler. The model consists of the governing equations with their boundary conditions and some associated algebraic equations. The related latent heat of water evaporation is taken as a heat source in the energy equation, and the mass of evaporated water is treated as a mass source in the mass equation. The study presents a comparison of the computed results with that of experimental results for the same evaporative cooler. A good agreement between the calculated and experimental results is achieved. The influences of the inlet frontal air velocity, pad thickness, inlet air dry-bulb temperature on the cooling efficiency of the evaporative cooler are calculated and analyzed. The predicted results show validity of simple mathematical model to design the direct evaporative cooler, and that the direct evaporative cooler with high performance pad material may be well applied for air conditioning systems. © 2010 Elsevier Ltd. All rights reserved.


Khachikyan L.,Yerevan State University of Architecture and Construction
Advanced Materials Research | Year: 2014

The artistic expressions, constructive techniques, national cultural values of monument buildings, their succession and maintenance problems are especially perceptible and appreciable when observed in their historical environment.Monuments can be observed in two main groups according to their location: natural and urban landscape groups. Naturally, landscape changes over years undergoing construction development and different natural or anthropogenic influences. Of course much more structural problems are notable in urban contexts, since they are much more susceptible to dynamic changes in urban environment.The above mentioned problems are various in Republic of Armenia (RA): as a result of spontaneous development and incorrect land use monuments often lose their vitally important natural environment, perspective and landscape silhouette. This article mainly deals with the structural and panoramic problems of landscape, emerged in the environments of monument buildings in RA. They have been studied by comparative analysis based on the examples of existing monuments both in urban structure and natural landscape.Based on photographical comparison, analysis of literature, software and metric gauging methods it will be possible to reveal the planning, climatic, anthropogenic negative, neutral and positive factors affecting the modification of protection zones of monuments in RA.As a result it becomes possible in particular situations to neutralize much of the existing negative factors. The study will give an opportunity to solve some problems of already modified environments or landscape continuous degradation by developing rehabilitation projects, providing new interesting solutions related to the aesthetic and technological aspects, as well as the materials that are being used. © (2014) Trans Tech Publications, Switzerland.


Margaryan V.,Yerevan State University of Architecture and Construction
Advanced Materials Research | Year: 2014

National Geodesic Network of WGS-84 system was founded in the territory of the Republic of Armenia from 2002 to 2007, which includes zero, first, and second class 1115 stations and there were other 229 State Geodesic Triangular Network stations. The observation at these stations has been done by GPS system. Each of the above mentioned stations covers on the average 27 square kilometers of the territory of Armenia. The data obtained during GPS observations have become the foundation for creating local quasigeoid models and obtaining differences of heights (geoid wave value) of normal and WGS-84 ellipsoid surfaces. On the basis of gravimetric data a quasi-geoid model has been computed and developed. To creat the model coordinates of four geodetic satations encompassing the area of the Republic of Armenia have been used. To get the digital model of the selected area was diveded into five-minute sections by latitude and longitude and then coordinates of geodetic points have been taken. The above mentioned points were recalculated from the local system to WGS-84 system. The creation of the local elippsoid quasi-model is conditioned by the difference of 3D coordinates difference of three-dimensional of each point’s position. The values of the geoid wave vary within the range of 17.4547 meters, the average difference being almost in the centre of the area and is 21.2522 meters. To obtain the digital model of the quasi-geoid at the given local ellipsoid at each 100m a square matrix (of the network) was made by coordinates of recomputed points. © (2014) Trans Tech Publications, Switzerland.


Shamyan V.L.,Yerevan State University of Architecture and Construction
Advanced Materials Research | Year: 2014

The studies on operating effectiveness of sand traps in partially acting facilities of the Yerevan Aeration Plant have shown that along the satisfactory clarification of silts (sand) of mineral origin at the facility bed materials of organic origin are also trapped causing sand traps failure their main function which is clearly separation of the two types of waste waters. In addition serious problems and difficulties arise also in the sand removal. © (2014) Trans Tech Publications, Switzerland.


Yedoyan V.,Yerevan State University of Architecture and Construction
Advanced Materials Research | Year: 2014

A torsion problem of a prismatic rod made up of two prismatic parts joined together by their common side is considered. Materials of component parts have different properties of orthotropic anisotropy. An exact solution of the problem has been obtained for the case when nonlineal edges cross-section of the rod are the arcs of ellipses. Composite parts of the prismatic rods are connected entirely by their common surface. The anisotropy axis is perpendicular to the crosssection plane. The problem has been solved in Cartesian coordinate system. The functions of stresses are presented by the sums of solutions corresponding to positive eigenvalues of homogeneous boundary problems and partial solutions of inhomogeneous boundary problems. From condition of existence of the non-trivial solution of the homogeneous boundary problem an equation in respect to eigenvalues is derived of which roots are real and different. If there are roots in (0; 1) interval, then the stresses tend to infinity at the vertex of the cross-section of the composite rod have a feature with the order equal to 1-λ1where λ1 - is the smallest root in the interval (0, 1).It has been shown that exact solutions for stress functions are obtained if the rod cross-section sectors' non-linear parts are elliptical arcs characterised by an elasticity coefficients of the the rods' materials. In case the rods are made of isothropic materials, then arcs of ellipses are becoming circular. © (2014) Trans Tech Publications, Switzerland.


Simonyan A.,Yerevan State University of Architecture and Construction
Advanced Materials Research | Year: 2014

In the article represented specificity`s price formation process strength of technical activity hydro social cycle in the Republic of Armenia. Analysis of drinking water consumption is done with respect to three groups: standpoint of interest domestic farms, especially in industry and farmers. Industry included all subjects of services and products maker in economy, which is not included in domestic farms or agriculture fields. Appear from industry field include for example: nitrogenous factory, power generation company, banks holding, railways, hospitals and the others. Drinking water supply and waste water derivations services have six important technical directions in hydro social cycle: water intake, drinking water conditioning, drinking water distribution, waste water collecting, waste water reconditioning and derivations: Here are calculated unit cost, overhead and cross costs for each process fabrication, and corresponding its we create hypothetical named average unit cost, as well as average overhead and cross costs. © (2014) Trans Tech Publications, Switzerland.


Ter-Petrosyan G.V.,Yerevan State University of Architecture and Construction
Advanced Materials Research | Year: 2014

The calculation of the structure's hardness is of special importance in calculation of possibility of existing splits' distribution in account of ensuring the reliability of the problem's solution. It is known that the structure's crumbly deterioration is dangerous not only for its unexpectedness but also because it takes place in the conditions of operating voltages of such magnitude, which are obviously smaller than the calculating ones. This means that the actual supply of structure's hardness, which is defined by the usual calculating methods of hardness, without taking into account the existence of splits, will be significantly smaller than the provided. If the existence of splits are not taken into account, then the local overvoltage occurs around them and ultimately unprecedented crumbly deterioration of structure takes place. © (2014) Trans Tech Publications, Switzerland.


Mamyan Z.,Yerevan State University of Architecture and Construction
Advanced Materials Research | Year: 2014

In the current social-political situation it has become a necessity to define the main trends of the development of the city of Yerevan and the reformation of its center. Moreover, these trends should correspond to the existing legal and economic fields, which in its turn will lead to the formation of new public centers.At present we have very few samples of historical and cultural heritage that witness about our urban past. There also exist some historically treasured areas that are subject to reconstruction.The aim of urban planning, in general, is to turn the public formation contents into an artistic image.This presupposes the planning and objectification of the environment characteristic to the given public formation.It is very important to find the standards which can help to organize areas in Yerevan, the capital of Armenia, along the abovementioned lines.Within the last 20 years due to the collapse of the Soviet Union, the declaration of independence of the Republic of Armenia, the establishment of new economic relations as well as the absence of centralized state means, an unregulated and undesirable process of construction has come into being. These changes made the gap between the reality and the present documents of urban planning projects, legislative documentations and socioeconomic relations even deeper. © (2014) Trans Tech Publications, Switzerland.

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