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391.
392.
Numerična rešitev konvektivnega toka v porozni snovi zaradi nasprotujočih si vzgonskih sil
Janja Kramer, Renata Jecl, Leopold Škerget, 2008, objavljeni znanstveni prispevek na konferenci

Opis: V prispevku so predstavljeni numerični rezultati problema naravne konvekcije zaradi dvojne difuzije v porozni snovi, kjer si učinka termične in snovske vzgonske sile med seboj nasprotujeta. Za opis toka tekočine po porozni snovi je uporabljen Brinkmanov model, kjer je upoštevan dodatni viskozni člen v gibalni enačbi. Izkaže se, da je konvektivni tok odvisen od vrste vodilnih parametrov, pri čemer je ključnega pomena vrednost vzgonskega koeficienta, ki definira velikost in smer delovanja posamezne vzgonske sile. Zastavljen sistem parcialnih diferencialnih enačb je rešen z uporabo Robno Območne Integralske Metode, ki se je že izkazala kot primerna za reševanje problemov toka tekočine v porozni snovi.
Ključne besede: naravna konvekcija, dvojna difuzija, porozna snov, numerični rezultati
Objavljeno: 31.05.2012; Ogledov: 831; Prenosov: 14
URL Celotno besedilo (0,00 KB)

393.
Trdnost : zapiski predavanj
Igor Špacapan, 2008, drugo učno gradivo

Ključne besede: trdnost, napetost, specifične deformacije, konstitutivne enačbe, torzija, upogibnice, visokošolski učbeniki
Objavljeno: 31.05.2012; Ogledov: 734; Prenosov: 38
URL Celotno besedilo (0,00 KB)

394.
Trdnost : zapiski predavanj
Igor Špacapan, 2008, drugo učno gradivo

Ključne besede: trdnost, napetost, specifične deformacije, konstitutivne enačbe, torzija, upogibnice, visokošolski učbeniki
Objavljeno: 31.05.2012; Ogledov: 1526; Prenosov: 208
URL Celotno besedilo (0,00 KB)

395.
Needed innovations in intermodal rail freight transport
Stanislav Božičnik, 2008, objavljeni povzetek znanstvenega prispevka na konferenci

Ključne besede: rail freight, inter-modal transport, rail freight paradigm, logistics development trends, innovative intermodal solutions
Objavljeno: 31.05.2012; Ogledov: 796; Prenosov: 6
URL Celotno besedilo (0,00 KB)

396.
Selection of warehouse-transportation vehicles using discrete simulations
Matjaž Šraml, Tone Lerher, Grega Ljubej, 2008, objavljeni znanstveni prispevek na konferenci

Opis: In this paper four different types of warehousingtransportation vehicles (lifttrucks and stacker crane) are analyzed. The complexity of designing warehousing systems in an analytical way is high; therefore the discrete simulation models were performed in order to gain the basic data for different types of warehousing-transportation vehicles. First, the counter balance lift truck is analyzed, which is useful for a lower rack warehouse construction and a lower frequency of operation. Next, the reach truck is analyzed; it enables to achieve higher lifting places, with a relatively high frequency and lift capacity. The narrow aisle lift truck can reach heights up to twelve meters, and is suitable for high frequency demands and lift capacities. Finally, the automated storage and retrieval system is analyzed. The presented models prove to be a very useful and flexible tool for choosing a particular type of warehousing system on the first stage of designing the warehouse process.
Ključne besede: discrete numeric simualtions, transport warehousung unit, warehouse system
Objavljeno: 31.05.2012; Ogledov: 829; Prenosov: 10
URL Celotno besedilo (0,00 KB)

397.
Metuljeva krila
Danijel Rebolj, 2008, umetniški sestavek

Ključne besede: pesmi
Objavljeno: 31.05.2012; Ogledov: 554; Prenosov: 3
URL Celotno besedilo (0,00 KB)

398.
399.
Modern deformation measurement techniques and their comparison
Boštjan Kovačič, Rok Kamnik, Miroslav Premrov, Nenad Gubeljak, Jožef Predan, Zdravko Tišma, 2008, pregledni znanstveni članek

Opis: Deformation measurement experiment has been undertaken where a concrete structure was subject to controlled loading. Concrete plate was loaded with hydraulic cylinder PZ 100 up to 42 kN. Nikon total station ser. 720 and camera Fuji Pro S3 have been used to make measurements at critical points during each additional load. A hydraulic computer operated cylinder was used for load increase. The use of total stations for deformation measurements is quite often, but the combination with digital photography is rather new and very suitable technique. It offers the capability of simultaneous monitoring of a large number of signalized or non-signalized points with very low root mean square error of 0.16 mm in geodetic method 0.7 mm in photogrammetry, respectively. The concrete plate was modeled and the comparison with the geodetic, photogrammetric and hydraulic method was made.
Ključne besede: deformation measurements, geodesy, digital photogrammetry
Objavljeno: 31.05.2012; Ogledov: 993; Prenosov: 13
URL Celotno besedilo (0,00 KB)

400.
The use of micro-simulation in determining the capacity of a roundabout with a multi-channel pedestrian flow
Tomaž Tollazzi, Tone Lerher, Matjaž Šraml, 2008, izvirni znanstveni članek

Opis: The main purpose of this paper is to analyse the influence of the multi-channel pedestrian flow on the capacity of the one-lane roundabout, using discrete simulation methods. The proposed model is based on the theory of the expected time void between the units of pedestrian traffic flow, which have the priority when crossing the arm of the roundabout. The proposed model represents an upgrade of the previous research in the field of modelling traffic flows in the one-lane roundabout. While the previous model of the pedestrian crossing is handled as the single-channel system in which the pedestrians arrive randomly from one side of the pedestrian crossing only, the proposed model deals with the multi-channel system in which the pedestrians arrive randomly from both sides of the pedestrian crossing. In thi sway the mathematical model can better illustrate the real conditions. The previous model considers only the disturbances of entry traffic flow of motorised vehicles caused by the pedestrian flow crossing the roundabout arm. The proposed model considers the disturbances caused by the circular traffic flow of motorised vehicles as well. A simulation analysis has been conducted on the roundabout at Koroška Street in Maribor, in which the counting of the motorised traffic flow and the pedestrian flow has been performed in the morning peek hour. The results of the analysis have indicated a high reserve of the capacity for pedestrians who arrive from the left and right sides of the roundabout with regard to motorised vehicles in the analysed arm of the roundabout. The real reserve of the capacity would otherwise be smaller in case of enlargement of the motorised vehicle flow in the future. Nevertheless it would be high enough for an undisturbed traffic flow of motorised vehicles through the roundabout to be possible. The presented methodology represents a practicable and adaptable tool for planning the roundabout capacity in practice and for the sensitivity analysis of individual variables on the throughput capacity of the roundabout.
Ključne besede: roundabout, pedestrian flow, traffic flow modeling, simulation models
Objavljeno: 31.05.2012; Ogledov: 1064; Prenosov: 13
URL Celotno besedilo (0,00 KB)

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