Time filter

Source Type

Mindu G.,University of Architecture and Urbanism, Bucharest
Romanian Journal of Acoustics and Vibration | Year: 2012

Interior soundproofing is a requirement for buildings with special activities where the level of vibration and noise shall be minimal. This paper specifies the essential requirements for the definition of performance vibration isolation from the outside of buildings for special purposes. This category includes operating rooms, facilities and premises of "white rooms", rooms processing, calibration and mounting the semiconductor where the level of vibrations from the urban environment and/or industry should be below the allowed threshold. In this context, we detail the dynamic model of a building placed on elastomeric elements for which are set the physical and geometric conditions by decoupling and reduction their frequency in ratio 1/4 .... 1/6 of the excitation frequencies. Also, are set the equations of motion for the externally excited system in order to evaluate the level of forced vibrations. Source

Mindu G.,University of Architecture and Urbanism, Bucharest
Romanian Journal of Acoustics and Vibration | Year: 2012

This paper is focused on the effect of elastomer supporting of the tram railways used for damping vibrations and noise transmitted to the surrounding buildings. For this, the experimental methods under dynamic regime both stationary and transient attaining the resonance point are presented. In this way the dynamic system parameters, namely: dynamic stiffness, the fraction of critical damping, coefficient of dissipation (hysteresis) were determined. Thus, the damped free vibration method was used and the controlled dynamic method with monotone increasing variation for the excitation frequency for stiffness and damping characteristics of rubber manufactured by various recipes. Finally, the paper presents experimental results obtained in the laboratory and the degree of noise reduction produce by tram railway in large urban areas of cities in Romania. Source

Petrisor A.-I.,University of Architecture and Urbanism, Bucharest | Ianos I.,The Interdisciplinary Center | Talanga C.,The Interdisciplinary Center
Environmental Engineering and Management Journal | Year: 2010

Given the spatial dimension of urban (urbanization, deurbanization, urban restructuring etc.) and industrial (exploitation of natural resources) processes, Coordination of Information on the Environment Programme (CORINE) data provide an image of land cover/use dynamics in territorial statistical units - administrative units and development regions. This study employed ordinary kriging interpolation to depict how these processes are reflected at macro-scale changes in land cover and use. Results indicate that areas affected by any kind of land cover changes predominate in the South-West Region (especially Mehedinti and Gorj counties), while areas affected by land use changes in the urban areas concentrate in the Oriental Carpathians (counties Suceava, Harghita, Covasna, Bacǎu, and Neamt). Urbanization seems to cluster in the South-East, but also in spaces situated at the limits of the development regions South-East, Center, North-East, and North West. Deurbanization explains land use changes in the South- West and West Regions. The results indicate that anthropic pressures on natural systems are the driving force of environmental dynamics. Methodologically, the study underlines the potential of using kriging to assess environmental changes and their consequences over land use. Source

Bucurescu D.,Horia Hulubei National Institute of Physics and Nuclear Engineering | Bucurescu I.,University of Architecture and Urbanism, Bucharest
Romanian Reports in Physics | Year: 2011

A non-destructive method for measuring moisture within porous building materials is presented. It is based on the detection of the backward angle scattered gamma-rays of a 241Am source, with a LaBr3:Ce scintillator detector. An example of application of this method is given by measuring the moisture in bricks (building material) with various water contents. The method is suitable for the examination of building walls (houses, historical monuments) and of building material samples. Source

Petrea S.C.,University of Architecture and Urbanism, Bucharest
Advanced Materials Research | Year: 2013

Contemporary architecture is more often thought about in the terms of self-sustainability and price efficiency. Choice of materials and the overall design including the building structure and the enclosures, its energy systems, the reuse of resources and the minimum waste production are discussed all over the world. Implementing buildings in natural sites or in sub-urban communities that are not connected to the usual urban facilities is always a challenge if we intend to use sustainable strategies. Our approach describes a case study of a design strategy based on a few general principles, crucial in optimizing material and energy consumption and waste and emissions reduction for a new construction. We will follow the interdisciplinary approach of the design process analyzing how each step taken to a certain direction affects the entire planning stage, influencing also the constructive systems. Also we will show how every used element influences the processes of the building with certain constraints for the architectural approach, especially in terms of functional and aesthetic valences. © (2013) Trans Tech Publications, Switzerland. Source

Discover hidden collaborations