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Open access

Grzegorz Kunikowski

Abstract

Projects of common interest are projects serving the implementation of priority corridors and areas of energy infrastructure, mainly trans-European electricity, gas and oil transmission networks in order to reduce the European Union’s energy dependence. They also help strengthen the energy security of individual countries, including Poland. The article aims at reviewing projects and assessing an impact on domestic markets in the context of the challenges of the fuel and energy sector in Poland. The article is an analytical study, in the “desk research” formula. Research methods used during the elaboration of the research include the analysis of national and EU strategic documents and the subject matter of energy security. In order to evaluate the impact of the implementation of projects of common interest on a variety of supplies of a member country (Poland), an exemplary assessment of the diversification status is presented using Hirschman-Herfindahl concentration index for gas supplies.

Open access

Sindija Balode and Uldis Kamols

Abstract

The research focuses on the rental housing market in Riga and reveals that among factors that affect the rent level in neighbourhoods of Riga the most are distance from the city centre, neighbourhood safety, quality of housing and transport infrastructure, access to shopping malls, and employment opportunities. The aim of the research is to analyse the housing market in Riga, by putting a special focus on price determinants and lesson keys of Helsinki. Quantitative and qualitative research methods are used in the paper with the biggest contribution being extraction and analysis of data about more than 1800 rental apartments in Riga from the largest Latvian online real estate advertisement platform. Quantitative analysis is based on investigating relationships between average rent levels in different neighbourhoods of Riga and index values of 23 urban environment factors. In addition, the rental housing market in Helsinki is researched, emphasising few guidelines for rental housing market improvements in Riga, such as introducing government subsidies.

Open access

Graig Arcuri and Chaoliang Jing

Abstract

This paper provides a description of the community governance paradigm shifts in China over the past 4 decades. By taking a historical review of Chinese tradition in community governance, a brief history of the transformation of property rights in the former Soviet Bloc, plus a theoretical analysis from the perspective of social physics, this study clarifies the inherent logic for the community governance evolution across China. The influence that ancient dynasties, up to 1949, exerted upon the modern community governance has been large, which has formed certain social governance inertia. However, there have emerged many new forms of power among which the homeowners are the strongest group to demand more autonomy. By using a social physics framework, this article sheds light on the ongoing tension between the traditional inertia and the emerging trend of autonomy in real estate. Furthermore, the logic could be employed for predicting the future community governance style in China.

Open access

Libor Ižvolt, Peter Dobeš and Juraj Pieš

Abstract

The initial part of the paper briefly characterizes the present state of the track substructure dimensioning for the non-traffic load and the necessity of updating the design map of frost indexes IFd as a basis for dimensioning. A substantial part of the paper is dedicated to the method of evaluating the data provided by the Slovak Hydrometeorological Institute (SHMI), and determining the dependency of design air frost indexes IFd on altitude for the coldest winter period in the past 50 years. The paper conclusion presents the updated design map of frost indexes and the assessment of the importance of its updating in terms of the track substructure dimensioning methodology for the non-traffic load.

Open access

Rositsa Petkova-Slipets and Penka Zlateva

Abstract

The paper presents the results from a study of the thermo-physical properties of a new synthetic acrylic polymer used as material in road construction and as concrete on its basis. For the purposes of the study, the Modified Transient Plane Source Method (MTPS) was used. Data on the following thermal characteristics were obtained: thermal conductivity coefficient, thermal effusion, thermal diffusion and specific thermal capacity. A comparative analysis was made with the analogous indicators of conventional petroleum bitumen and asphalt concrete. The results of the study can be used for a more precise calculation and prognosis of temperature deformations and thermal stresses, as well as the crack propensity at low temperatures in asphalt concretes.

Open access

Traian Mazilu, Ionuţ Radu Răcănel and George Stoicescu

Abstract

The rail dampers are mechanical devices which work as dynamic absorbers to reduce the rail vibration and rolling noise. The paper shows the experimental results from the functionality and performance testing of an experimental demonstrative rail damper. The vibration attenuation takes the highest values, namely 6-22 dB, between 160 and 1000 Hz.

Open access

Marek Kurnatowski

Abstract

The article describes the results of tests carried out to determine the measurable effect of vibrations on the accuracy of measurements with an automatic precise leveller. It contains specification of the research station created to examine the case and description of factors affecting the measurement results. The multi-frequency vibrations were forced on a leveller during measurements and calculated mean errors for each frequency analysed. The range of frequencies for which the measurement was possible was estimated. The obtained results can be helpful in the engineering measurements designing, especially in industrial areas, where vibrations are an inseparable element of the environment.

Open access

Zeynab Mohammadian and Majid Shahbazi

Abstract

Housing is a widespread and complex issue with a variety of dimensions. First, housing was considered as a physical location and as a shelter and basic necessity of the households, but today the concept of dwelling as the place that provides all the services and facilities necessary for a better life of the family has been created. One of the issues discussed at many conferences and in general in the scientific community is the definition of sustainability in the psychological point of view, along with the ways to introduce this concept into the architecture and human habitat environments. This research first begins with the main question about how the concept of sustainability can be found within the scope of housing. Then existing resources search is done and accessible projects are analyzed and the weaknesses and strengths of traditional architecture and contemporary architecture are compared. Finally, the relationship between the definitions of three concepts: dwelling, sustainable design and traditional Iranian architecture was discussed. At the end, the sustainable design that is also appropriate to the Iranian culture was presented.

Open access

Veronika Valašková and Jozef Vlček

Abstract

This article illustrates the applicability of the Finite Element Method (FEM) in the analysis of multi-layer concrete pavement systems subjected to tire loading of a heavy vehicle. For the purpose of simplifying the interaction of the interaction system, it is appropriate to divide the system into two separate independent subsystems, the vehicle and the pavement. For this reason, 2-dimensional interaction model of the contact vehicle-obstacle and 3-dimensional FEM model of the concrete pavement were created. A several constitutive material models, such as linear elastic model, are applied in the analysis to describe the behaviour of the pavement structure. The numerical results from the first computational model can be used as the input for the second calculation phase. The concrete pavement represents a standard pavement, which is used for the regular road structures in road engineering. FEM modelling of the pavement can be used for the direct estimation of the pavement response without performing time and cost expensive field experiments. Calculations were performed in software ADINA using FEM method.

Open access

Mária Kúdelčíková and Eva Merčiaková

Abstract

In structural dynamics models of mechanical oscillator and vibration analysis are of great importance. In this article motion of mechanical oscillator is modelled using second order linear autonomous differential systems. Stability of such 1 DOF models is investigated with respect to the coefficients of systems. Phase portraits for various cases are displayed and the character of fixed points is described.