Polytechnic University of Tirana

Tirana, Albania

The Polytechnic University of Tirana is a public university located in Tirana, the capital of Albania. It offers degrees in engineering and related fields. Wikipedia.

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Kodhelaj N.,Polytechnic University of Tirana
Renewable and Sustainable Energy Reviews | Year: 2011

The Llixha Elbasan hot springs are among the most important geothermal springs of Albania. Balneological use dates back centuries, but the first modern use started in 1937. Unfortunately this water has not been used for its energetic values yet. The temperature of the water is above 60 °C and the flow above 16 l/s, thus direct utilization is possible, in particular for space heating. Three-dimensional temperature field calculations and engineering calculations on a heating system with heat exchangers are presented here. The results show that the water temperature is expected to be stable and considerably higher temperature is expected through deep well drilling. Geothermal water of Llixha hot springs fulfils all requirements needed for a district heating system in the region. The University's Campus of Tirana is composed of 29 buildings, which are partially heated through a coal heater. The installed capacity is 2558 kW while the coal consumption is about 920 kg/h. The University's Campus of Tirana is one of the most important areas and with the highest density of population in Tirana, so it is the best area to show the heat exchanger efficiency. The economical analyses prove that the borehole heat exchangers are more convenient than the coal heating systems. © 2011 Elsevier Ltd. All rights reserved.

Ormeni R.,Polytechnic University of Tirana
Tectonophysics | Year: 2011

This paper describes the one-dimensional (1D) velocity model computed by VELEST in the SEISAN seismic analysis system, inverting re-picked P-wave and S-wave arrival times recorded during 2002-2006 by the Albanian, Montenegro, Thessalonica and Macedonia seismic networks. The re-picked data yield P-wave and S-wave velocities proved to be more suitable compared to bulletin data for this detailed inversion study. Seismic phases recorded by the Albania seismic network and integrated with data from the Montenegro, Thessalonica and Macedonia networks are used to prepare the Albanian seismic bulletin. Earthquake hypocenters from the Albanian bulletins have also location errors that are negligible for civil protection purposes, large scale seismotectonic analyses and more accurate hypocentral determinations which are necessary for detailed seismotectonic and geodynamic studies. It was noted that the smoothness of the velocity variation increased with depth. A velocity of 5.5. km/s was calculated for the upper crust, 6.1. km/s was calculated for the middle crust and 6.9. km/s was computed for the lower crust. P wave velocity was 7.85. km/s at depth of 50. km and for the upper mantle it is 8.28. km/s. Using the improved velocity model, the earthquakes which occurred in Albania in the past 5. years were able to be relocated, achieving constrained hypocentral determinations for events in Albania. The interpretation of the 1. D velocity models infers interesting features of the deep structure of Albania. These results represent an important step towards more detailed seismotectonic analyses. © 2010 Elsevier B.V.

Zavalani O.,Polytechnic University of Tirana
2011 8th International Conference on the European Energy Market, EEM 11 | Year: 2011

The paper reviews the literature concerning the energy savings achieved by installation of energy management systems and alternative energy-saving systems (such as alternative heating, ventilation, cooling, and lighting systems). Savings through enlightened occupant behaviour and operation of building systems are also discussed. Implementation of energy management system and the reduction of need for mechanical heating and cooling equipment permit the reduction of buildings energy up to 50% and often entail no greater construction cost than conventional design. The energy efficient solutions require an integrated design process, in which the building performance shall be optimized through an iterative process that involves all members of the design team from the beginning. It should be highlighted that an energy management system is installed in a 21 floor building in Tirana. The total electrical energy footprint of the building is 135kWh/m2/year from 200kWh/m2/year that was before the installation of the system. It comes out that the result is in accordance with the energy efficiency goals of a lot of developed countries. © 2011 IEEE.

Zavalani O.,Polytechnic University of Tirana
Computer Applications in Engineering Education | Year: 2015

Computer-based simulation (CBS) is a powerful tool in engineering education. In the article, the findings of a study designed to evaluate the impact of CBS for the development of a design course project (DCP) in the framework of the Electrical Applications course taught at electrical engineering master degree are presented. The study is based on an experimental approach to evaluate the impact of CBS on student results during the first year. Then, during three subsequent years, surveys were collected to analyze students' perception of the impact that CBS had on the student's learning efficacy and level of motivation during the development of the DCP. The main finding of this work is that students who used CBS as an additional tool during the development of the DCP achieved significantly higher results than their colleagues who did not use it. Analysis of the surveys indicates that students perceived an impact of CBS on their learning efficacy and level of motivation near the high levels of the scoring system used. © 2015 Wiley Periodicals, Inc.

Cano E.,Polytechnic University of Tirana
Advances in Intelligent Systems and Computing | Year: 2015

Cache memory performance is very important in the overall performance of modern CPUs. One of the many techniques used to improve it is the split of on-chip cache memory in two separate Instruction and Data caches. The current CPU organizations usually have per core separate L1 caches and unified L2 caches. This paper presents the results of simulating different CPU organizations with unified and separate L2 Instruction and Data caches using Marss-x86, a Cycle-Accurate full system simulator. The results indicate that separating the L2 cache memory provides higher overall CPU IPC. The highest improvement is 3% and is achieved in a quad-core CPU model with shared L3 cache. Analyzing the hardware costs and complications of separating L2 cache might be an interesting future work direction. © Springer International Publishing Switzerland 2015.

Ormeni R.,Polytechnic University of Tirana
8th Congress of the Balkan Geophysical Society, BGS 2015 | Year: 2015

The main cause of Albanian seismicity is the collision of Adria microplate with the Albanian orogeny. Seismic phases recorded by the Albanian network, integrated with data of Thessalonicy (Greece), Montenegro and INGV (Italy) networks, are used to prepare the database. We present here the results of the analysis in parameters of events and some features of seismicity that have occurred in the Albania and its surrounding area during 2014. The earthquake foci are concentrated mostly along the some active faults. In the Fieri-Elbasani-Dibra occurred a moderate earthquake (ML = 5.2 Richter). This transversal fault zone belongs to a complex faulting environment. In the vicinity of Fieri was registered a small series of earthquakes that supposed to be an inducted seismicity. Thr Durres-Gjiri i Lazlit-Ulqini fault zone is located near the Albanian orogen front, in convergence with Adria micro plate, and for this reason compress movements here are strongest ones. Increased seismic activity was registered nearby of southern Albania on the Greece territory and in easthern Albania on Macedonia territory.

Ormeni R.,Polytechnic University of Tirana
8th Congress of the Balkan Geophysical Society, BGS 2015 | Year: 2015

We map the b value of the frequency magnitude relationship of earthquakes in map views in the seismogenic zones of the Albania from the corrected and declustered background seismicity catalogue based on Md scale, covering the time period between 2001 and 2014. The computed spatial distribution shows strong spatial heterogeneity within the range 0.84±0.04 and 1.33.±0.049 in the seismogenices zones. Anomalously low b-value areas more or less coincide with the spatial distribution of M≥5.0 earthquakes and their known rupture extents. A clear decrease in temporal distribution of b-value is observed before the moderate main shocks. In generally the spatial distributions of b-value reflect the known seismotectonic structures of Albania. Mapping of the b-values provides detailed images of the zones presenting low and high seismic activity and it may be used as a measure of seismic potential sources and relative hazard levels.

Banja M.,Polytechnic University of Tirana
Journal of Environmental Protection and Ecology | Year: 2012

This paper aims: (i) to verify the existence of the ozone weekend effect in the Tirana area, and (ii) to relate this phenomenon with the concentration of nitrogen oxides (NO x). This study was performed by analysing the distributions of ozone (O 3) and NO x concentrations during summer 2006 and year 2007. The monitoring sites were located at an urban and suburban area. The suburban site is located about 3 km from the city center and it is not significantly influenced by traffic emissions. On the contrary, observations at the urban site are strongly affected by vehicular emissions, as the instruments are located in a road where traffic is heavy during daytime. The daily variations of ozone and nitrogen oxides concentration were calculated exploiting the continuous database. The analysis shows that ozone levels are influenced by the traffic emissions that are strongly related to the city activities, as they become higher during the weekends, when ozone precursors emissions are reduced. The concentration of nitrogen dioxide was found to be 87% higher at the urban site compared to the suburban one while the concentration of ozone about 20% higher at the suburban site compared to the urban one. Moreover, the concentration of ozone and nitrogen oxides presents a typical diurnal variation, while ozone accumulation rate is higher during the weekend. The reduction of nitrogen oxides emissions at the urban site was associated with the existence of ozone weekend effect. This result could be exploited by environmental and medical authorities in order to plan their future strategies.

Hysenbelliu E.,Polytechnic University of Tirana
CEUR Workshop Proceedings | Year: 2015

Software Defined Networking (SDN) is a new and important approach in networking technology, designed to create high level abstractions on top of which hardware and software infrastructure can be built to support new cloud computing applications. SDN is also referred to as programmable network because it attempts to isolate control plane from data plane and provides an independent and centralized unit to control the network (this application unit is called Controller). These networks are implemented to support dynamic nature of the network functions and intelligent applications with low operating cost through simplified hardware, software and management. The aim of this paper is to implement and present a study of cloud based architecture for IPTV Service implemented inside SMC ISP data center (Software Media Communication ISP). SDN SMC Architecture is built in a simple concrete way involving Napster-3Protocol, NGNIX and SOAP Application Protocols achieving IPTV service in more secure, scalable and cost effective manner. Copyright © 2015 for the individual papers by the papers' authors.

Modelling of land use may be improved by incorporating the results of species distribution modelling and species distribution modelling may be upgraded if a variable of the process-based variable of forest cover change or accessibility of forest from human settlement is included. This work presents the results of spatially explicit analyses of the changes in forest cover from 2000 to 2007 using the method of Geographically Weighted Regression (GWR) and of the species distribution for protected species of Lynx lynx martinoi, Ursus arctos using Generalized Linear Models (GLMs). The methodological approach is separately searching for a parsimonious model for forest cover change and species distribution for the entire territory of Albania. The findings of this work show that modelling of land change and of species distribution is indeed value-added by showing higher values of model selection of corrected Akaike Information Criterion. These results provide evidences on the effects of process-based variables on species distribution modelling and on the performance of species distribution modelling as well as show an example of the incorporation of estimated probability of species occurrences in a land change modelling.

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