Theoretical model for determination of airspace capacityBranko Lučovnik
, Martin Lipičnik
, Domenik Lebar
, Janko Blatnik
, 2002, pregledni znanstveni članek
Opis: In the last decade, the constant air traffic growth has brought certain problems as well. While aircraft production and airline functioning are being stimulated by the competition, the situation in air traffic control and in infrastructure component is completely different. Air traffic management (ATM) is still owned by the state. The state, however, is known for the fact of not being a good manager and is solving problems slowly and not efficiently because of its large administration. There is a very strong trade union movement functioning in ATM system, which makes several rational decisions impossible. Critics of the current ATM system in Europe warn of increasing problems-delays and operational expenses. The control component is the only one among the four components of air traffic, which has not been liberalised and harmonised yet. There is no competition in the fields of air traffic. All matters are taken care of by CAA or by semi-private companies, owned by the state. According to air carriers which have to put in 4-9% of business expenses into terminal-and over-flights charges, these expenses are far too heavy a burden.
Ključne besede: air traffic, airspace capacity
Objavljeno: 06.06.2017; Ogledov: 128; Prenosov: 3
Celotno besedilo (3,30 MB)
The impact of regulation 561/2006 on fleet management viewed through efficient use of drivers' working timeRobert Muha
, Drago Sever
, 2009, pregledni znanstveni članek
Opis: The introduction of contemporary procedures to fleet management processes has recently changed the work planning and supervision of driver's work activities. Tendencies to control the implementation of driver's work have been present in modem professional practice for quite a long time; however, the equipment available on the market limited its implementation. The intensified development of digital tachographs has, in technical terms, ensured such equipment considerably before the legislative groundwork was prepared for its practical implementation. The Commission Regulation (EC) No. 561/2006 (implementation of Social legislation relating to Road Transport) does not bring any essential novelties in terms of permitted workload. Consistent monitoring of drivers activities, made possible by digital tachographs, will have impact on the existing working methods. The topic of the present paper is in deep analysis of the impact of the mentioned regulation with special emphasis on the conditions for the regulation of the current stage of drivers work and on the expected consequences. The essential importance lies on the expected change in the mentality and approach to planning the driver's activities in the transport process on the part of the carrier: the outcome will eventually result in the efficiency of each individual carrier.
Ključne besede: fleet management, driver's work planning, digital tachographs
Objavljeno: 06.06.2017; Ogledov: 59; Prenosov: 5
Celotno besedilo (2,98 MB)
The contribution to the procedure of capacity determination at unsignalized priority-controlled intersectionsTomaž Tollazzi
, 2004, pregledni znanstveni članek
Opis: The problem of minor vehicles crossing or merging into the major stream at unsignalized priority-controlled intersections is well-known. Numerous solutions involve various assumptions concerning the major headway distributions, number of major lanes, critical gap distributions, etc. Such cases can be divided into two main groups: intersections with two streams (one major and one minor stream) and intersections with more than two streams (more than one major stream and one minor stream). At roundabouts, also at single-lane roundabouts, there are similar problems like the ones at other unsignalized priority-controlled intersections. A vehicle at the roundabout approach can only cross the pedestrian crossing when a sufficient time-gap between two pedestrians (or cyclists) is provided. A vehicle at the roundabout entries can only merge into the major stream when a sufficient gap between the two vehicles in the major stream is provided. Because of that, single-lane round-abouts can also be treated as unsignalized intersections with two major lanes: the first one in its circulatory roadway and the second one on the pedestrian crossing.
Ključne besede: unsignalized intersection, roundabouts, capacity, two major streams, pedestrians, critical gap
Objavljeno: 06.06.2017; Ogledov: 87; Prenosov: 6
Celotno besedilo (2,55 MB)
Slewing port jib cranesBoris Visočnik
, Stojan Kravanja
, 2002, pregledni znanstveni članek
Opis: The paper presents slewing port cranes with a luffing jib. The advantages of slewing port jib cranes are high lifting capacities, high speeds of re-loading and excellent mobility since they are capable of load lifting, travelling, luffing and slewing. The paper gives a detailed description of their characteristics such as the highest reached load-carrying capacities, speeds of motion and accelerations. It also presents the crane assembly, driving mechanisms, loads and load cases, transport by ships and testing of lifting capacity. As a practical example, the paper presents the slewing port jib crane with the capacity of 25/15/5 t at a 27/37/40 m radius made by the Slovenian companyMetalna Maribor for the shipyard 3. Maj, Rijeka, Croatia.
Ključne besede: cranes, port, port cranes, slewing port jib cranes
Objavljeno: 06.06.2017; Ogledov: 109; Prenosov: 5
Celotno besedilo (3,08 MB)
Roundabout arm capacity determined by microsimulation and discrete functions techniqueTomaž Tollazzi
, Matjaž Šraml
, Tone Lerher
, 2008, izvirni znanstveni članek
Opis: The paper demonstrates the influence of the multi-channel pedestrian flow on the actual capacity of a one-lane roundabout, using micro-simulation and discrete functions. The proposed model is based on the theory of the expected time gap 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.Apart from the multi-channel pedestrian flow the disturbances caused by the circular traffic flow of motorised vehicles at the roundabout are also considered. In this way the model can better illustrate the real conditions in traffic. A simulation analysis has been performed on the roundabout arm at Koroška Street in Maribor. The results of the analysis have indicated a relatively high reserve of the actual throughput capacity for the main motorized traffic flow in the analysed roundabout arm. The presented model 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: roundabouts, traffic flow analysis, micro-simulation modelling, capacity analysis
Objavljeno: 05.06.2017; Ogledov: 137; Prenosov: 7
Celotno besedilo (4,50 MB)
Reliability analysis of operation for cableways by FTA (fault tree analysis) methodSergej Težak
, Zdravko Toš
, Ivo Jurić
, 2010, izvirni znanstveni članek
Opis: This paper examines the reliability of the operation of cableway systems in Slovenia, which has major impact on the quality of service in the mountain tourism, mainly in wintertime. Different types of cableway installations in Slovenia were captured in a sample and fault tree analysis (FTA) was made on the basis of the obtained data. The paper presents the results of the analysis. With these results it is possible to determine the probability of faults of different types of cableways, which types of faults have the greatest impact on the termination of operation, which components of cableways fail most, what is the impact of age of cableways on the occurrence of the faults. Finally, an attempt was made to find if occurrence of faults on individual cableway installation has also impact on traffic on this cableway due to reduced quality of service.
Ključne besede: service quality, reliability, fault tree analysis, faults, quality, ski-tows, chairlifts, aerial ropeways, cableways
Objavljeno: 05.06.2017; Ogledov: 122; Prenosov: 6
Celotno besedilo (653,93 KB)
Reduction of the roundabout capacity due to a strong stream of pedestrians and/or cyclistsTomaž Tollazzi
, 1999, izvirni znanstveni članek
Opis: Single-lane roundabouts may face the problems of getting crowded and empty in their circulatory roadway due to a strong stream of pedestrians and/or cyclists. Vehicles at the roundabout entries or exits have to provide the right of way over pedestrians and/or cyclists. Therefore, it comes to disturbances and traffic jams. If there are jams at the entry carriageway, vehicles are unable to get into roundabouts. If there are jams at the exit carriageway, vehicles are not able to leave the roundabout. When the length of vehicle platoon at the exits so long that it reaches the preceding entry, the roundabouts suffer from getting fully overcrowded. The paper presents the methodology of calculating the reduction of the roundabout capacity due to the pedestrian or cyclist stream. The method of calculating the reduction of the roundabout capacity with the disturbed streams may be used for roundabouts in urban environments, where the strength of the cyclist or pedestrian streams is not negligible.
Ključne besede: road traffic, roundabouts, roundabout capacity, traffic throughput, bicyclists, pedestrians
Objavljeno: 05.06.2017; Ogledov: 113; Prenosov: 5
Celotno besedilo (1,66 MB)
Real capacity of ropeway transportation subsystemDrago Sever
, 2000, kratki znanstveni prispevek
Opis: The ropeway transportation system plays a major role in mountain resorts. In order to provide a sustainable development of the entire mountain resort system, the real capacity of the ropeway transportation system was set. The real capacity of the ropeway transportation system is one of the indicators of the development harmonisation level of single system elements. The research into this field was carried out at the Road Traffic Centre of the Faculty of Civil Engineering, University of Maribor. The paper deals with the basic points of the topic and the methods used. The know-how transfer of experiences into the Slovenian environment is presented together with the obtained results.
Ključne besede: traffic management, traffic, transport, ropeway, capacity
Objavljeno: 05.06.2017; Ogledov: 82; Prenosov: 2
Celotno besedilo (2,01 MB)
Outsourcing logistics at petrol stations in SloveniaRatko Zelenika
, Darko Bečaj
, Helga Pavlić
, 2008, kratki znanstveni prispevek
Opis: The environmental disburdening by means of outsourcing logistics (sorting, bundling, transport) is today significantly more present, since this has been regulated by the law provisions on environmental protection and the economic reasons. Outsourcing logistics in this field with its activities such as: improvement in assembling separate fraction, introduction of new, i. e. additional boxes, usage of specific vehicles for collection and dispatch, reestablishment of information systems and organization of a centre for disburdening of the environment(sorting, bundling and waste disposal) is contributing largely to a better accomplishment of the mission of logistics rationalization and adaptation to new law claims on environmental protection.
Ključne besede: logistics, petrol stations, outsourcing logistics, environemntal protection, economics
Objavljeno: 05.06.2017; Ogledov: 83; Prenosov: 4
Celotno besedilo (2,45 MB)