Technical University of Civil Engineering Bucharest
Bucharest, Romania
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Enulescu M.,Technical University of Civil Engineering Bucharest
Proceedings of the 8th International Conference on Electronics, Computers and Artificial Intelligence, ECAI 2016 | Year: 2016

Through time track circuits have to be modified and upgraded. It is a necessity of modernization of rail transport. Increasing train speeds, and overcoming the human sensory capabilities of the driver, leads to the need to pass through the track circuit the information for train movement authority. With the advent of electric traction equipment appeared the interference with the track circuits and affecting his signals. In this paper it is proposed one new step in this way, a new track circuit with multiple transmitters that can improve the transmission for on-board information. This new track circuit uses a new technology "borrowed" from the mobile communications. © 2016 IEEE.

Agency: European Commission | Branch: H2020 | Program: IA | Phase: DRS-09-2015 | Award Amount: 8.81M | Year: 2016

Recent studies from the IPCC indicate that Europe is particularly prone to increased risks of river and coastal floods, droughts resulting in water restrictions and damages from extreme weather such as heat events and wildfires. Evaluations also show a huge potential to reduce these risks with novel adaptation strategies. Researchers, innovators and incubators develop innovative products and services to reduce the increased climate change risks. Many of these innovations however hardly arrive at the markets. BRIGAID BRIdges the GAp for Innovations in Disaster resilience. BRIGAIDs approach is supported by three pillars. (1) At first BRIGAID takes into account the geographical variability of climate-related hazards and their interaction with socio-economic changes, (2) BRIGAID establishes structural, on-going support for innovations that are ready for validation in field tests and real life demonstrations and (3) BRIGAID develops a framework that enables an independent, scientific judgement of the socio-technological effectiveness of an innovation. BRIGAIDs objective is ambitious but achievable with strong consortium partners in EU, two Associated Countries and support from Overseas Territories. BRIGAID (a) brings actively together innovators and end-users in Communities of Innovation, resulting in increased opportunities for market-uptake; (b) contributes to the development of a technological and performance standards for adaptation options by providing a Test and Implementation Framework (TIF) and test facilities throughout Europe; (c) Improves innovation capacity and the integration of new knowledge by establishing an innovators network and (d) strengthens the competitiveness and growth of companies with the support of a dedicated business team. Finally BRIGAID develops a business models and market outreach to launch innovations to the market and secure investments in innovations beyond BRIGAIDs lifetime.

Agency: European Commission | Branch: FP7 | Program: CP-FP | Phase: ENV.2010.3.1.5-2 | Award Amount: 4.65M | Year: 2011

Brownfield regeneration is essential for sustainable land management in European Member States. Currently, the success in brownfield regeneration is unsatisfying in terms of financial and eco-efficiency or social acceptance. Many useful and innovative technologies site clean-up as well as methods to support decision making processes exist, but they are only rarely applied using their full potential. An immense diversification of tools with little connection to each other as well as a lack of consideration of regional and cultural specificities deters end-users from application. Sometimes the non-visibility of tools is the reason that problem owners, managers, local authorities and other stakeholders do not regenerate brownfields using the best technology available. Additionally, emerging challenges, such as the urgent demand for soil remediation and the reuse of on-site infrastructures, call for the development of new and integrated solutions. This project will overcome existing barriers to brownfield regeneration by developing and providing customised problem- and target-oriented packages of approaches, technologies and tools. As a unique asset, these packages deliberately include the cultural and administrative characteristics and their regionally distinctive features. By providing a customisable toolbox specifically addressing the diverse processes that have to be dealt with during the course of a regeneration project, end-users will be enabled to find best practice based solutions. Improvement of existing means to support brownfield regeneration will be further accomplished by filling methodological core topics such as intelligent remediation in terms of technological advancements with regard to phytoremediation and partial source removal technologies. The project will deliver a tailored training and dissemination programme as part of an information centre that will transfer existing and emerging knowledge to the scientific community and end-users.

Nastase I.,Technical University of Civil Engineering Bucharest | Meslem A.,University of La Rochelle
Experiments in Fluids | Year: 2010

Passive control of jet flows in order to enhance mixing and entrainment is of wide applicative interest. Our purpose is to develop new air diffusers for HVAC systems, by using lobed geometry nozzles, in order to ameliorate users the thermal comfort. Two turbulent 6-lobed air jets with and without lobe deflection angles were studied experimentally and compared with a reference circular jet having the same initial Reynolds number. The main objective was to analyze the modifications occurring in the vortex dynamics of the flow, firstly by replacing a circular tube with a straight lobed tube, and secondly by a lobed tube having a double inclination of the lobes. Rapid visualizations of the flows and hot-wire measurements of the streamwise velocity spectra allow understanding the vortex roll-up mechanisms. Unlike the circular jet, where the primary rings are continuous, the Kelvin-Helmholtz vortices in the lobed jet flows were found to be discontinuous. The resulting "ring segments" detach at different frequencies whether they are shed in the lobe troughs or at the lobe sides. One explanation relies on the strong variation of the exit plane curvature. Additionally, a speculative scenario of the vortical dynamics is advanced by the authors. The discontinuous nature of the K-H vortices enables the development of secondary streamwise structures, non-influenced by the passage of the primary structures as in the case of the circular jet. Thus, the momentum flux transport role played by the streamwise structures is rendered more efficient and leads to a spectacular increase in the entrainment rate in the initial region. The amount of fluid being entrained in the lobed jet by the streamwise structures is drastically amplified by the double inclination of the nozzle exit boundary. © 2009 Springer-Verlag.

Catalina T.,Technical University of Civil Engineering Bucharest | Iordache V.,Technical University of Civil Engineering Bucharest | Caracaleanu B.,Technical University of Civil Engineering Bucharest
Energy and Buildings | Year: 2013

Nowadays, heating energy demand has become a significant estimator used during the design stage of any new building. In this paper we are proposing a model to predict the heating energy demand, based on the main factors that influence a building's heat consumption. It was found out that these factors are: the building global heat loss coefficient (G), the south equivalent surface (SES) and the difference between the indoor set point temperature and the sol-air temperature. In the second part of this paper, multiple dynamic simulations were carried out in order to determine the values of the inputs and output data of the future prediction model. Using the obtained database, a multiple regression prediction model was further used to develop the prediction model. In the last part of this paper the model results was validated with the measured data from 17 blocks of flats. Moreover, in this article it is also shown the comparison with the results calculated using the building's energy certification methodology. A detailed error analysis showed that the model presents a very good accuracy (correlation coefficient of 0.987). In conclusion, the proposed model presents the following characteristics: three inputs and one output, simplicity, large applicability, good match with the simulations and with the energy certification calculations, human behavior correction. © 2012 Elsevier B.V. All rights reserved.

Pavel F.,Technical University of Civil Engineering Bucharest
Soil Dynamics and Earthquake Engineering | Year: 2015

This short article evaluates the stochastic method of ground motion simulation for Bucharest area using both the single-corner frequency model and recently introduced double-corner frequency models. A dedicated Q model is derived using ground motions obtained during the largest Vrancea earthquakes from the past 30 years. The simulated ground motions are tested against the observed data from the Vrancea earthquakes of August 1986 and May 1990. Moreover, the observed data are also compared against simulations obtained using the Q model derived by Oth et al. (2008). Finally, the results of the simulations show that the derived Q model is better suited for larger magnitude events, while the Q model of Oth et al. (2008) provides better results for smaller earthquakes. © 2014 Elsevier Ltd.

Catalina T.,Technical University of Civil Engineering Bucharest | Iordache V.,Technical University of Civil Engineering Bucharest
Building and Environment | Year: 2012

Nowadays, the indoor environment quality (IEQ) is growing as a new and very useful index of the building quality. The current literature presents the IEQ assessment based on questionnaires applied for existing building. The original approach of this study consists in the development of an IEQ index model that can be used by architects and engineers during design stage, in order to use it as an evaluation indicator or optimize the building energy consumption versus indoor environmental conditions. Based on a large database of values resulted from simulations, multiple non-linear regression models were obtained in order to predict variables such as operative temperature, indoor sound pressure level, indoor average illuminance and specific energy consumption. A predictive model for IEQ index is proposed as a function of the four quality indexes (air quality, thermal, acoustic and visual comfort). The entire approach was tested by means of a study case where the impact of windows' size and type on the IEQ assessment is discussed for a random climate. Also, there are presented detailed results concerning the monthly variation of IEQ and its correlation with the energy consumption. The proposed method proves to be a fast and useful method to verify architectural and engineering solutions according to the IEQ estimator. © 2011 Elsevier Ltd.

Barbulescu A.,Technical University of Civil Engineering Bucharest
Water Resources Management | Year: 2016

In this article we propose a new method - the Most Probable Precipitation Method (MPPM) - for estimating the precipitation at regional scale. Comparisons with the Thiessen polygons methods (TPM), inverse distance weighting interpolation (IDW) and ordinary kriging (OK) on annual, monthly, seasonal and annual maximum monthly precipitation are provided. In all cases MPPM performs better than IDW and OK, and in most of them, better than TPM. © 2015, Springer Science+Business Media Dordrecht.

Popescu D.,Technical University of Civil Engineering Bucharest
WSEAS Transactions on Systems | Year: 2014

The article makes an analysis of the functioning for the heating automation system with hot air blown into an individual dwelling. The structure of the automatic control system for indoor temperature in the dwelling is determined, in which the controller is a thermostat having feature type relay with hysteresis, the conditions related to the evolution of automatic control of the process are specified and the oscillation period of the control system is calculated. The automatic temperature control system model in individual dwelling is established using Simulink and its functioning by simulation in different representative situations is checked. The results of the simulation are compared with those obtained by calculation or they are used to determine the performance of the automatic control system.

Caluianu I.-R.,Technical University of Civil Engineering Bucharest | Balatretu F.,Technical University of Civil Engineering Bucharest
Applied Thermal Engineering | Year: 2012

A thermal model regarding a photovoltaic module has been developed and validated using experimental data. The aim of this study was to obtain the temperature field of a BP 585 F module mounted at different distances from a roof wall, as well as the temperature and velocity profiles of the air at the exit section between the panel and the wall. The influence of the mounting distance on the temperature and velocity values was also studied. The simulation is done by applying the Galerkin finite element method to the flow and energy equations, incorporating an implicit convective boundary condition. The results show a good accuracy of the model. © 2011 Elsevier Ltd. All rights reserved.

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