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    Wyświetlanie 1-6 z 6
    Tytuł:
    Methodology for expert evaluation of multimodal cargo transportation routes
    Autorzy:
    Asenov, Asen
    Pencheva, Velizara
    Ivanov, Boril
    Powiązania:
    https://bibliotekanauki.pl/articles/2098114.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    multimodal transport
    transit route selection
    transport multimodalny
    wybór trasy tranzytu
    Opis:
    The multimodal transportation of transit cargo is suitable for implementation through Bulgaria in the East-Northwest direction through the sea and river ports of the country as an alternative to the Romanian and Greek routes. Among the multimodal routes with a land leg through Bulgaria used and known so far, those via two seaports (Burgas and Varna) and three river ports (Ruse, Svishtov and Vidin) are most suitable. An expert evaluation methodology for selection of the most appropriate route is developed, including the Delphi method. A survey was conducted among 11 highly ranked and internationally recognized Bulgarian experts, known for their exceptional experience in the field of freight forwarding and international cargo transportation through Bulgaria. The results of the study show that the most suitable route for transit transportation is through the ports of Varna and Ruse with intermediate road haulage.
    Źródło:
    Transport Problems; 2021, 16, 2; 167--178
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planning and modeling of the time for acceptance and stay of vehicles at the loading and discharging points
    Autorzy:
    Asenov, Asen
    Pencheva, Velizara
    Georgiev, Ivan
    Powiązania:
    https://bibliotekanauki.pl/articles/2098173.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    vehicle
    optimization
    warehouse
    transceiver point
    ramp
    pojazd
    optymalizacja
    magazyn
    punkt nadawczy
    rampa
    Opis:
    When delivering goods in the warehouses of enterprises, courier and forwarding companies, and for logistics operators, loading and unloading is usually done manually or mechanically. On the other hand, the load can first be placed on the ground next to the vehicle and then accepted in the pile, or a ramp can be used so that it can be delivered directly to the warehouse or vice versa. When there is a ramp, the loading and discharging activity is performed faster and it is much easier. When there are many vehicles serviced on ramps, it is necessary to have a free ramp available. This is often not the case when the warehouse has more ramps and a large exchange of goods. In this case, a time schedule is usually made for the reception and handling of vehicles, which is communicated to carriers and drivers so that there is no unnecessary downtime of vehicles and overloading of points with ramps. There are cases in which the established organization of work cannot be performed due to various force majeure or other reasons, such as delays at border crossings, bans on passing through certain sections, change in the working hours of warehouses, pandemic and other reasons. The vehicles then arrive at the checkpoints at a time that is different from their schedule and have to wait to be serviced. Waiting at the unloading points makes drivers nervous and they become dissatisfied with the working conditions. In this respect, a solution has been proposed based on the working hours and occupancy of the loading and discharging point and the time of arrival of the vehicles at the point, and how to receive the vehicles so that the waiting time between them is the shortest. For this purpose, a partially integer linear optimization model has been created in Matlab, which provides a valid plan with the shortest waiting times for all vehicles. Simulations have been made for different numbers of ramps and vehicles. The results show that the model is suitable for pre-creating a valid plan for the operation of the vehicle warehouse, if any, with a minimum waiting time.
    Źródło:
    Transport Problems; 2021, 16, 4; 23--34
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of fine particulate matter in low-emission zones using a modified numerical method for a system of ordinary differential equations
    Autorzy:
    Asenov, Asen
    Georgiev, Ivan
    Pencheva, Velizara
    Mineva, Kremena
    Powiązania:
    https://bibliotekanauki.pl/articles/2203898.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    low-emission zone
    PM10
    PM2.5
    prediction
    strefa niskiej emisji
    PM2,5
    prognoza
    Opis:
    Currently, many European cities have severely exceeded the EU air quality standards and are struggling with high concentrations of fine particulate matter PM10 and PM2.5 in the air, with road transport often being one of the major polluters. One of the forms for correction of the problem that many cities in the EU are currently using is the construction of low-emission zones. For the prediction of PM10 and PM2.5, a modified numerical method for a system of ordinary differential equations has been proposed. In the right part of this system, in addition to the main trend and the periodicity of PM10 and PM2.5, their correlation is taken into account. Against the background of the best solution obtained, a forecast is made fo the emission levels in a period of one week in the town of Ruse.
    Źródło:
    Transport Problems; 2022, 17, 3; 197--210
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligent system for improved safety of pedestrian traffic lights
    Autorzy:
    Evstatiev, Boris
    Balbuzanov, Toncho
    Beloev, Ivan
    Pencheva, Velizara
    Powiązania:
    https://bibliotekanauki.pl/articles/375093.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    traffic safety
    pedestrians
    detection
    road crossing
    bezpieczeństwo na drodze
    piesi
    wykrywanie
    skrzyżowanie drogowe
    Opis:
    The high concentration of vehicles and pedestrians at traffic lights makes them a common place for road accidents to occur. The main reason for them is the behavior of vehicle drivers and pedestrians, who often violate the traffic law because of incorrect judgments. This study investigates a special type of traffic lights, which are located on places without roads intersection. In the present study, a concept for improving the safety of such traffic lights is suggested. The method suggests a novel algorithm for the detection of pedestrians, based on image processing and a background pattern. The concept of the detection system makes it applicable in different climatic conditions, such as rain, snow, dust, etc., and offers many advantages over the current situation in Bulgaria. The intelligent system only detects pedestrians in the waiting zones, in order to optimize the traffic problems, such as traffic delays, use by disabled people, protection against troublesome users, etc.
    Źródło:
    Transport Problems; 2019, 14, 1; 35-43
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the use of alternative energy sources in inland waterway transport
    Autorzy:
    Pencheva, Velizara
    Asenov, Asen
    Beloev, Ivan
    Georgiev, Valeri
    Powiązania:
    https://bibliotekanauki.pl/articles/374013.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    water transport
    vessel
    electric propulsion
    river Danube
    alternative energy
    transport wodny
    jednostka pływająca
    napęd elektryczny
    rzeka Danube
    energia alternatywna
    Opis:
    A study has been conducted on the use of alternative energy sources for propulsion of a vessel in inland waterway transport. It is clear that at this stage it is most appropriate to use a vessel designed for short-haul trips between two banks of a ferryboat for passengers and luggage or for recreation and entertainment. On this basis, research has been conducted on a newly designed and built vessel to carry up to 12 people. The drive is fully powered by 180-Ah batteries at 48 V. The batteries are charged by the sun through 5-kW solar panels. The results show that the vessel powered by two 5-kW electric motors can sail autonomously for about 1.5 hours, to travel about 13 km, at an average speed of 7.9 km/h with an average energy consumption of 71.3 kWh/100km when sailing on a linearly reversible route including sailing downstream and upstream on the Danube River.
    Źródło:
    Transport Problems; 2019, 14, 3; 109-120
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the daily irregularity on specific routes, servicing the passenger stops in ruse Bulgaria
    Autorzy:
    Pencheva, Velizara
    Asenov, Asen
    Grozev, Dimitar
    Georgiev, Ivan
    Stoyanov, Pavel
    Powiązania:
    https://bibliotekanauki.pl/articles/375288.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    passenger transport
    passenger stop
    urban transport
    transport node
    modeling
    transport pasażerski
    przystanek osobowy
    transport miejski
    węzeł komunikacyjny
    modelowanie
    Opis:
    For this study, an analysis of a system of transport nodes of the railway and bus service transportation was carried out. A principal scheme of a transport node in typical cities for Bulgaria and a sample flow chart are presented. The categories of basic requirements for transport nodes in cities are also defined. On the basis of a railway system and bus transport nodes in the city of Ruse, Bulgaria, research on the interaction of the system with the mass urban passenger transport has been conducted. As a result, a mathematical model is proposed for the average daily inbound flows of passengers to a specific passenger stop, and a specific route has been modelled to be used as a server. An assessment of the daily irregularity on this route has been performed and a system has been modelled as a system of mass service for assessing the capacity and organization of work. The incoming passenger flows and the speed of passenger service have also been defined as a non-stationary Poisson flow. Under the conditions of non-stationarity flows, the basic values of the system parameters have been calculated and an application has been created in the MatLab platform. For a model of the system of mass service, the system of the differential-algebraic equations Kolmogorov/Erlangen for stochastic processes has been selected.
    Źródło:
    Transport Problems; 2019, 14, 4; 5-19
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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