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Analysis of composite T beam composed of timber, concrete and carbon strip
Matjaž Tajnik, Peter Dobrila, Miroslav Premrov, 2007, izvirni znanstveni članek

Opis: This paper provides a mathematical model and numerical example of composite T-section composed of a concrete plate and a timber beam strengthened at the bottom tension side with a carbon fibre-reinforced polymer (CFRP) strip. Analysis is provided in accordance with the European standards for timber, steel and concrete structures. The tensile strength of the carbon strip as well as the compressive strength of the concrete plate are higher than the bending strength of the timber beam, therefore it is convenient to use such composition of material to gain a higher load bearing capacity. It has been shown that the inclusion of CFRP strip reinforcement on the increase of load carrying and bending stiffness capacity was not as high as expected. On the other hand, we realized the importance of variety of material grade and geometrical properties combinations between sub-components which can significantly improve load bearing capacity and stiffness of composed beam. Furthermore, the CFRP strip contribution to the bending resistance and stiffness of the element is presented as a function of the fastener spacing intervals between concrete plate and timber beam.
Ključne besede: composite structures, timber structures, carbon strip, load bearing capacity, modeling
Objavljeno: 31.05.2012; Ogledov: 884; Prenosov: 17
URL Celotno besedilo (0,00 KB)

Study of crosslinking efficiency of cotton cellulose by different physical-chemical methods and genetic programming
Olivera Šauperl, Miran Brezočnik, 2006, izvirni znanstveni članek

Opis: We have investigated the crosslinking effect of unmercerized and mercerized cotton celluose crosslinked with different BTCA mass fractions in the impregnation bath. Crosslinking efficiency was analyzed using FT-IR spectroscopy, water retention capacity method, tensiometry and the methylene blue method. On the basis of the experimental data which was obtained with theseparate physical-chemical methods, different prediction models for crosslinking efficiency was developed. Modelling was taken out with the genetic programming method. Research shows good accordance of the experimentaldata with the genetic models.
Ključne besede: textile fibres, cotton, cellulose, crosslinking, FTIR spectroscopy, methylene blue method, water retention capacity, tensiometry, genetic programming
Objavljeno: 30.05.2012; Ogledov: 959; Prenosov: 15
URL Celotno besedilo (0,00 KB)

Absorptive and transformative capacities in nanotechnology innovation systems
Krsto Pandža, Robin Holt, 2007, izvirni znanstveni članek

Opis: We identify managerial challenges offered by an emergent nanotechnology innovation system in which knowledge is dispersed, asymmetric and contested. We argue the proposed models of knowledge absorption and transformation enhance existing theories of knowledge and emergent technology by recognizing how and why knowledge flows among the actors in emergent technology innovationsystem. We base our argument on combined research evidence from a Delphi study concerning the future of European manufacturing, from which a selected statement has been analyzed, and from analysis of the NanoManufacturing Institute at Leeds University, UK; specifically its work in building ties between different actors associated with nanotechnology. We conclude our paper with suggestions for future research.
Ključne besede: technology management, nanotehnology, innovation systems, knowledge flows, absorptive capacity, transformative capacity
Objavljeno: 31.05.2012; Ogledov: 719; Prenosov: 5
URL Celotno besedilo (0,00 KB)

Application of the european SINTAP procedure to the failure analysis of a broken forklift
Nenad Gubeljak, Uwe Zerbst, Jožef Predan, Maks Oblak, 2004, izvirni znanstveni članek

Opis: The recently developed European flaw assessment procedure SINTAP was applied to the failure analysis of a broken fork of a forklift. Based on the service load at failure, critical crack sizes were determined at different analysis levels of the procedure. It was shown in the present case study that the failure was caused by defective design.
Ključne besede: structural integrity, mechanics of structures, forklift, fracture mechanics, critical crack size, failure analysis, SINTAP procedure, load bearing capacity
Objavljeno: 01.06.2012; Ogledov: 775; Prenosov: 12
URL Celotno besedilo (0,00 KB)

Terminal airspace capacity model
Milan Janić, Vojin Tošić, 1982, izvirni znanstveni članek

Opis: The objective of the research described in this paper was to produce a model for the analysis of terminal airspace capacity and the sensitivity of this capacity to the parameters which influence it. The model developed is based onthe concept of an expected ultimate capacity and applies to arriving traffic under saturation conditions i.e. a constant demand for service. It is possible to use the model for planning and operational purposes: for the computation of terminal airspace capacity, the separation of aircraft at the terminal entry gates so as to provide maximum capacity, and for heuristic optimization of arriving aircraft trajectories through the terminal airspace. For a sensitivity analysis the model allows for changes in terminal airspace geometry, runway(s) in use, arriving aircraft trajectories, arriving traffic distribution between the terminal airspace entry gates, aircraft type mix, aircraft velocities and air traffic control separation rules.
Ključne besede: air traffic, capacity model, terminal traffic
Objavljeno: 05.06.2012; Ogledov: 611; Prenosov: 11
URL Celotno besedilo (0,00 KB)

Modelling operational, economic and environmental performance of an air transport network
Milan Janić, 2003, izvirni znanstveni članek

Opis: The paper models the operational, economic and environmental performance of an air transport network consisting of airports and air routes connecting them. The operational capacity represents the operational performance. Thresholds on the networkćs environmental burdens reflect the environmental performance. The economic performance comprises the networkćs profits. Modelling the network performance includes using integer programming techniques to maximise total network profits for given operational capacity and environmental constraints under conditions where environmental externalities are internalised.
Ključne besede: air transport network, performance, capacity, environment, profits, externalities, optimization
Objavljeno: 05.06.2012; Ogledov: 399; Prenosov: 3
URL Celotno besedilo (0,00 KB)

Expansion of airport capacity at London Heathrow airport
Milan Janić, 2004, izvirni znanstveni članek

Opis: Civil aviation has been confronted with the problem of matching its capacity to growing demand long term. This has been a particularly important issue at some large European and U.S. airports where increasing operational, economic, and, particularly, environmental constraints have affected expansion and development. The long-term matching of capacity to demand at London Heathrow Airport in England is discussed. This analysis includes predicting airport demand relative to annual number of aircraft movements and number of passengers, designing solutions for providing capacity, and generating scenarios for long-term matching of capacity to demand. The results indicate that until the year 2020 the airport will permanently struggle with congestion both airside and landside.
Ključne besede: civil aviation, airport system, airport capacity, London Heathrow airport, aviation
Objavljeno: 05.06.2012; Ogledov: 368; Prenosov: 4
URL Celotno besedilo (0,00 KB)

Dimenzioniranje krožnih križišč
Boštjan Celan, 2012, delo diplomskega projekta/projektno delo

Opis: Projektna naloga z naslovom Dimenzioniranje krožnih križišč ne opisuje splošnih dognanj, temveč se osredotoča na eno izmed metod za dimenzioniranje krožnih križišč. Skozi prebiranje »izdelka« se bralec najprej sreča s splošnimi dejstvi o dimenzioniranju krožnih križiščih. V nadaljevanju pa se tema zoži in se osredotoči na samo metodo za dimenzioniranje krožnih križišč, imenovano Highway capacity manual (HCM). Zaradi več desetletnega obstoja te metode in večih izdaj priročnikov, v katerih je zapisana ta metoda, sta v tej projektni nalogi opisani dve izmed njih, z namenom ugotoviti izboljšave in novosti. Opisana je metoda iz izdaje priročnika iz leta 2000 (HCM 2000) ter iz zadnje izdaje priročnika iz leta 2010 (HCM 2010), in zajema splošne informacije in pa vse potrebne enačbe, ki so nujno potrebne za izračun posameznih parametrov. Ob koncu teoretičnega dela je primerjalna tabela, v kateri se primerja metoda iz obeh izdaj priročnika HCM. Vsa teoretična dognanja in spoznanja pa so podkrepljena s praktičnim primerom.
Ključne besede: Krožna križišča, dimenzioniranje, priročnik Highway capacity manual (HCM).
Objavljeno: 26.09.2012; Ogledov: 1084; Prenosov: 136
.pdf Celotno besedilo (1,34 MB)

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