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    Wyświetlanie 1-14 z 14
    Tytuł:
    Mathematical model of evaluation of the efficiency of investment into roads
    Matematyczny model do wyznaczenia efektywości inwestycji drogowych
    Autorzy:
    Lingaitis, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/374693.pdf
    Data publikacji:
    2008
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    investment
    model matematyczny
    wydajność
    inwestycje
    mathematical model
    efficiency
    Opis:
    When implementing projects on motor roads, financial and economic analysis of specific projects are usually provided. This article deals with the mathematical model which enables to analyze the entirety of projects on the motor road network with the view of determining which of them would give benefit to society the fastest and could be given priority in case of implementation. By applying this model and using the LP search (abbreviation from Russian Linear search) multi-criteria optimizing method, it is possible to calculate the project payoff time and an expected profit through the reduction of public costs. Also, an example on realization of the model is provided with calculation of the benefit that society receives if gravel road is paved.
    Źródło:
    Transport Problems; 2008, 3, 3; 41-51
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of alliances, mergers and takeovers on efficiency of air transport
    Wpływ aliansów, fuzji i przejęć na efektywność transportu lotniczego
    Autorzy:
    Hawlena, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/375174.pdf
    Data publikacji:
    2012
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    transport lotniczy
    wydajność
    sojusz
    fuzja
    przejęcie
    air transport
    efficiency
    alliance
    merger
    takeover
    Opis:
    Increasing competition in the air transport market leads to changes in the positioning of companies and to searching for effective means to improve economic efficiency. Effective realization of the transportation process entails considerable expenses, and obtaining financial resources is becoming more and more difficult. In the era of globalization the process of looking for the methods to improve efficiency in the air transport is considerably growing in importance. The article presents the functioning process of strategic alliances, the system of code - share agreements and the significance of the level of the Load Factor coefficient. Possibilities of establishing a new organization by means of a merger or a takeover are also presented.
    Narastająca konkurencja na rynku usług transportu lotniczego prowadzi do zmiany pozycjonowania przedsiębiorstw oraz poszukiwania skutecznych sposobów poprawy efektywności ekonomicznej. Skuteczna realizacja procesu transportowego wiąże się z wydatkowaniem znacznych nakładów, a ich pozyskanie staje się coraz trudniejsze. W dobie globalizacji szczególnego znaczenia nabiera proces poszukiwania metod poprawy efektywności w transporcie lotniczym. W artykule zaprezentowano proces funkcjonowania sojuszy strategicznych, system umów code - share, oraz znaczenie poziomu współczynnika Load Factor. Przedstawiono również możliwości utworzenia nowej organizacji w wyniku fuzji lub przejęcia.
    Źródło:
    Transport Problems; 2012, 7, 2; 15-26
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the influence of hydrogen on the energy performance of a spark ignition engine using gasoline and bioethanol fuel mixtures
    Autorzy:
    Mejeras, Gabrielius
    Rimkus, Alfredas
    Matijošius, Jonas
    Powiązania:
    https://bibliotekanauki.pl/articles/2098159.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    bioethanol
    hydrogen
    gasoline
    fuel
    mixture
    consumption
    efficiency
    bioetanol
    wodór
    benzyna
    paliwo
    mieszanka
    zużycie
    wydajność
    Opis:
    The results of experimental studies of gasoline mixed with 10% bioethanol (E10), bioethanol mixed with 15% gasoline (E85), and hydrogen– oxygen gas (HHO) supplied as an additional fuel are presented in this paper. Research was carried out to determine whether E85 with hydrogen– oxygen gas is feasible for use as a replacement fuel. During the test, a port injection HR16DE spark ignition engine was used. Experiments were carried out at a constant engine speed (n = 2000 rpm), throttle opened at 15°, using a stoichiometric mixture λ = 1.0 and a lean mixture λ = 1.1. After determining brake torque, fuel consumption data, and energy performance, the results of various fuels were determined. It was found that the highest engine brake torque was developed using E85, but at the same time, fuel consumption increased. E85 yielded the best energy efficiency for a lean mixture (λ = 1.1). A small amount of HHO gas (~ 0.95% energy) yielded a small positive effect only on using E10 fuel at λ = 1.1.
    Źródło:
    Transport Problems; 2021, 16, 3; 41--51
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effects of food and drink intake to driving performance: a systematic review
    Autorzy:
    Sutalaksana, Iftikar Zahedi
    Pratama, Gradiyan Budi
    Yamin, Putra Alif Ramdhani
    Soetisna, Herman Rahadian
    Powiązania:
    https://bibliotekanauki.pl/articles/374354.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    drink
    driving error
    driving performance
    food
    intake
    błąd jazdy
    wydajność jazdy
    jedzenie
    spożycie
    Opis:
    Human-related factors are considered to be the main cause of traffic incidents or accidents, causing 69.70% of the incidents. Several studies have been conducted to identify the relationship between drowsiness or fatigue and driving performance. Furthermore, a number of other studies not only discussed the symptoms causing drowsiness but also tried to investigate related factors that cause sleepiness or fatigue while driving. On the other hand, some discussed the quantity and quality of sleep as well as food and drink intake before and while driving. This systematic review, which is based on the PRISMA method, aims to map previous studies that investigated the effect of different food/drink consumption, either taken prior to driving or while driving, on the on-road driving characteristics of drivers. Furthermore, this article is expected to serve as a reference for further research that could potentially contribute to minimizing driving errors that lead to incident or accident. From 1871 articles screened, 7 studies related to food/drink intake and driving performance were reviewed. On the basis of the existing studies, no real evidence showing the presence of the association between food intake and the monotony of the road to decrease the driving performance has been found; therefore, further research is needed.
    Źródło:
    Transport Problems; 2019, 14, 1; 5-12
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of a critical network ARC in a service system
    Autorzy:
    Janáček, J.
    Kvet, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/374173.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    detrimental event
    transportation performance
    service system
    critical arc characteristic
    zdarzenie szkodliwe
    wydajność transportu
    system obsługi
    Opis:
    Vulnerability of a transportation network influences, importantly, the function of public service systems constituted on the network. To be able to study the importance of an individual network arc for proper functionality of the system, we suggested a characteristic function of the arc transit time elongation together with its upper and lower estimations. We also suggested and verified an algorithm that enables the determination of parameters of the characteristic estimation, and we provide a reader with a computational study performed with real road networks.
    Źródło:
    Transport Problems; 2017, T. 12, z. spec.; 141-146
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charging railway infrastructure models and their impact to competitiveness of railway transport
    Autorzy:
    Dolinayova, A.
    Camaj, J.
    Kamaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/374368.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    competitiveness
    railway companies
    traffic performance
    charging railway infrastructure model
    konkurencyjność
    spółki kolejowe
    wydajność ruchu
    Opis:
    The paper deals with the impact the charging railway infrastructure access has on the competitiveness of railway transport in the selected European countries. It researched into the development of indicators that indicate the competition in the railways transport market, such as volume of transport, traffic performances, and number of trains of private railway operators compared with national operators. It used the new approach for research of the share of railway transport in the transport market. The research was based on a comparative analysis of models of charging railway infrastructure, subsidies to rail infrastructure, and development of transport performances of all rail operators. The results of research are presented in terms of freight and passenger railway transport.
    Źródło:
    Transport Problems; 2017, 12, 1; 139-150
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The cascade exchange pressure supercharger of transport diesel with deep cooling cycle air
    Autorzy:
    Krajniuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/374248.pdf
    Data publikacji:
    2011
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    cykl pracy
    doładowanie
    głębokie chłodzenie
    wydajność
    charakterystyka obciążenia
    working cycle
    supercharging
    deep cooling
    performance
    load characteristic
    Opis:
    The new principle of the organisation of working process of the combined supercharging system of transport diesel with the Cascade Pressure Exchanger (CPE) has been described. It allows considerably to raise level of forcing of the engine by supercharging at the expense of expansion of effective air supply area and coolings of supercharging air to temperature below an ambient. Substantive postulates of imitating model of work of combined engine(CICE) have been stated. Some results of calculation-experimental investigations of supercharging system of the engine 6×Í12/14 have been given. It confirms the possibility of the essential improvement tractive and fuel-economic factors of the transport installations in broad range of the working conditions.
    Źródło:
    Transport Problems; 2011, 6, 3; 67-76
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of pilots’ tiredness on the outcome of psychological testing
    Autorzy:
    Socha, Vladimir
    Hanakova, Lenka
    Freigang, Michal
    Kraus, Jakub
    Stojic, Slobodan
    Socha, Lubos
    Hanak, Peter
    Powiązania:
    https://bibliotekanauki.pl/articles/375429.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    human factors
    fatigue
    psychological testing
    performance
    pilot
    flight symulator
    wskaźniki ludzkie
    zmęczenie
    test psychologiczny
    wydajność
    symulator lotu
    Opis:
    Presented work is primarily oriented on the experimental verification of the influence of fatigue on the psychological condition of the flying personnel, using psychological and performance tests. For the evaluation of a pilot performance, the 24 hours experiment was conducted. In total, eight subjects participated in the experimental measurements. Eight participants went through several tests, including simulator flights, to investigate the effects of the fatigue on the results of psychological measurements. Measurements included workload evaluation, using NASA task load evaluation concept and performance testing, using the so-called OR-test. Significant statistical differences between measurements performed during 24 hours were not found in the case of NASA task load Scores. In the case of OR-test, Friedman ANOVA and subsequent post-hoc analysis show that the greatest decrease in performance was observed in approximately 22 hours of wakefulness, i.e. approximately in half of the measuring process. The concept of 24-hour measurements for the quantification of fatigue is not commonly used yet as well as objectivization using performance testing. As the apparent effect of fatigue is mainly on performance testing results, it can be argued that this work could serve as a basis for further studies on fatigue. Also, it could serve as a support for introducing new pilots' psychological testing procedures in the future, which could contribute to current efforts to improve aviation safety.
    Źródło:
    Transport Problems; 2019, 14, 2; 55-67
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the freight transnational rail liner service on the train scheduling in case of major corridors
    Wpływ serwisu linii towarowych kolei transnarodowych na harmonogramowanie pociągów w głównych korytarzach
    Autorzy:
    Popa, M.
    Raicu, S.
    Costescu, D.
    Rosca, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/374619.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    transnational liner service
    rail corridor
    corridor capacity
    train scheduling
    serwis linii transnarodowych
    korytarz kolejowy
    wydajność korytarza
    harmonogramowanie pociągów
    Opis:
    In this paper we discuss several consequences of the freight transnational rail liner service on the rail corridor capacity. The Northern part of the IVth TEN-T corridor on Romanian territory has specific feature related to the passenger flows connecting important Romanian demographic and economic clusters, on one side, and on the other side, to its diagonal crossing aspect, from the Western border to the Constanta port, connecting the Central Europe countries to the Black Sea regions, which means that there are a lot of expectation in terms of this corridor rail capacity: this corridor will, be for a long time further, the single and first completed continuous upgraded and modernised rail corridor. Its utilization will necessarily be heterogeneously planned (meaning for passengers rapid trains and freight rapid trains, from domestic/internal market, but especially for external market of Romania). In this paper, we consider a simple mathematical model for the calculus of capacity in two different cases: for a homogeneous utilization, meaning that all trains have the same running speeds and for heterogeneous utilization, when the passenger trains have the higher speed and hence, the higher priority over the freight trains, even if some of them are freight transnational liner service. Special feature of liner rail service has to be considered (fixed schedule, no stops for passenger train advance). We draw several useful possible solutions to be considered in order to preserve the active corridor capacity, and to assure a smooth flow for the transnational liner services, which ultimately will enhance the rail attractiveness.
    W artykule przedyskutujemy wpływ serwisu międzynarodowego, kolejowego transportu towarów na przepustowość korytarzy. Północna część IV-tego korytarza TEN-T na terytorium Rumunii posiada specyficzne cechy oparte o przepływy pasażerów łącząc ważne demograficznie i ekonomicznie ośrodki Rumunii, z jednej strony, a z drugiej strony o diagonalny aspekt skrzyżowań ze wschodniej granicy do portu Konstanca, łącząc centralne kraje Europy z regionami Morza Czarnego, co oznacza wielkie oczekiwania związane z przepustowością korytarzy kolejowych. Rozważamy prosty matematyczny model obliczania przepływu w dwóch różnych przypadkach - dla jednorodnego wykorzystania, co oznacza, że wszystkie pociągi mają taka samą prędkość przebiegu oraz niejednorodne wykorzystanie, kiedy pociągi pasażerskie maja większą prędkość i stąd wyższy priorytet niż pociągi towarowe, nawet jeśli niektóre z nich są międzynarodowymi liniami towarowymi. Dla tej ostatniej sytuacji zostało narysowanych kilka użytecznych, możliwych rozwiązań rozpatrywanych w szczególności by chronić aktywny przepływ korytarzy, oraz by zabezpieczyć płynny przepływ dla serwisu linii transnarodowych, które w końcu uwydatnią atrakcyjność kolei.
    Źródło:
    Transport Problems; 2013, 8, 3; 93-100
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Condition for application of logistic principles in practice of urban public passenger transport in the city of Omsk
    Autorzy:
    Mochalin, S.
    Kasper, M.
    Nikiforov, O.
    Levkin, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/375456.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    passenger public transport
    logistic system
    logistic principles
    efficiency
    quality
    pasażerski transport publiczny
    system logistyczny
    zasady logistyki
    wydajność
    jakość
    Opis:
    The task of increasing efficiency and quality of public transport has gotten special acuteness for large cities of Russia in connection with expansion of service by commercial carriers. There have no works done on the city of Omsk, where the transport system has its own characteristics. In this paper, characteristics of Omsk urban public transport are researched. The scheme that clearly demonstrates what factors have a negative impact on the development and functioning of the Omsk passenger transport system is developed. The measures that improve the efficiency of the passenger transportation system and provide an opportunity to advance the implementation of logistics principles are proposed. The activities took into account the experience of reforming the public transport system in other cities, the characteristics of the Omsk city system and a view to engagement of other scientists in this field of science.
    Źródło:
    Transport Problems; 2017, T. 12, z. spec.; 71-86
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating the safety performance of roundabouts
    Autorzy:
    Alshannaq, Mo'ath
    Imam, Rana
    Powiązania:
    https://bibliotekanauki.pl/articles/1841208.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    operational model
    accident prediction model
    roundabouts evaluation
    roundabouts safety performance
    model operacyjny
    model przewidywania wypadku
    ocena ronda
    wydajność bezpieczeństwa na rondach
    Opis:
    The use of roundabouts is well recognized for sustaining an efficient and safe intersection. However, the safety results may vary based on the prevailing conditions. Therefore, this study assesses the safety performance of roundabouts in Jordan. This study developed a predictive model by collecting and analyzing all accident records of 12 major urban roundabouts in the country over 3 years. For developing the model, this study employed an accident frequency analysis. The model calculated the rate of accidents and incorporated the geometric and operational characteristics of roundabouts. This was followed by ranking the safety performance of the roundabouts. It was concluded that driver behavior of violating the traffic rules, lack of clear lane markings in the circulating area and inadequate signage at the roundabouts entries are the main causes of roundabout accidents. The research recommends including the developed predictive model in future traffic control and planning studies, for identifying hazardous locations, or for prioritizing roundabout improvements based on safety performance.
    Źródło:
    Transport Problems; 2020, 15, 1; 141-152
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal compressor of cascade exchange by pressure
    Termiczny kompresor do kaskadowej wymiany ciśnienia
    Autorzy:
    Krajniuk, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/374103.pdf
    Data publikacji:
    2010
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    kaskadowa wymiana ciśnienia
    kompresor termiczny
    cykl pracy
    temperatura
    energooszczędność
    wydajność
    charakterystyka obciążenia
    cascade pressure exchange
    thermal compressor
    working cycle
    temperature
    power efficiency
    performance
    load characteristic
    Opis:
    A new method of organization of working cycle of device of direct transformation of heat in the located work of compression of air, based on principle of cascade exchange by pressure, is exposed; the results of pre-selection of basic dimensional and structural parameters of thermal compressor of cascade exchange by pressure are adduced; some special features of its working process are considered; main directions of perfection of working cycle of thermal compressors of cascade exchange of pressure are shown.
    Źródło:
    Transport Problems; 2010, 5, 1; 15-22
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Vehicle relocation efficiency - a case study of the parking company in the City of Zagreb
    Autorzy:
    Šimunović, Ljupko
    Protega, Veselko
    Ćosić, Mario
    Bandov, Davor
    Powiązania:
    https://bibliotekanauki.pl/articles/2098120.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    transport process efficiency
    indicators of transport vehicle utilisation
    systematic and integrated evaluation of the productivity
    wydajność procesu transportowego
    wskaźniki wykorzystania środków transportu
    systematyczna ocena produktywności
    zintegrowana ocena produktywności
    Opis:
    There is a need for vehicle relocation, whether for delivering new vehicles to their selling destinations, pulling inoperative or damaged vehicles out of traffiic, or removing illegally parked vehicles from the street. The relocation of illegally parked vehicles in the City of Zagreb is done by constantly monitoring parked vehicles or through citizen telephone alerts. The paper analyses the vehicle relocation service of the Zagrebparking company, which, in addition to overseeing car park management in public car parks and garages, is in charge of removing illegally parked vehicles. Due to the cyclic nature of its operations, a high share of empty rides, high vehicle investment costs, small quantities of cargo transported, high fuel prices, and high fuel consumption in the urban environment, Zagrebparking’s Vehicle Relocation Department operates with unnecessarily high costs. In this paper, vehicle relocation efficiency is analysed by presenting indicators of vehicle utilisation as part of a systematic evaluation of the company. Improvements to the current service are also provided.
    Źródło:
    Transport Problems; 2021, 16, 1; 39--50
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of provisions for evaluating the effectiveness of urban public passenger transport system
    Autorzy:
    Mochalin, Sergey
    Kasper, Mariya
    Nikiforov, Oleg
    Levkin, Grigory
    Kurshakova, Natali
    Powiązania:
    https://bibliotekanauki.pl/articles/374370.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    urban public passenger transport
    evaluation of the effectiveness
    indicators of effectiveness
    efficiency
    quality
    indexation-rating model
    factor analysis
    miejski publiczny transport pasażerski
    ocena skuteczności
    wskaźniki efektywności
    wydajność
    jakość
    model indeksacji
    analiza czynników
    Opis:
    The work presents a methodology that allows us to evaluate the effectiveness of the system in accordance with accepted standards in terms of the three components of the “passenger–carrier–department” system, taking into account the interests of each side. The given comprehensive effectiveness evaluation of the urban public passenger transport system shows that a new scientific idea consists in forming fundamentally new sets of indicators for each participant of the system (passenger–carrier–department of transport) that correspond to the conditions of functioning of the urban passenger transport system in Russian Federation. The article presents a classification model for the formation of a basic system of indicators and a functional scheme for grouping and ranking them. The effectiveness of the urban public passenger transport system can be considered separately for each participant in the system from its side, in two directions: horizontal (by year, for example, for an enterprise) and vertical (in the current period for all participants).
    Źródło:
    Transport Problems; 2019, 14, 1; 45-58
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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