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    Tytuł:
    Efektywność – rozważania nad istotą i typologią
    Autorzy:
    Kozuń-Cieślak, Grażyna
    Powiązania:
    https://bibliotekanauki.pl/articles/630355.pdf
    Data publikacji:
    2013
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    typology of efficiency, static efficiency, dynamic efficiency, technical efficiency, allocative efficiency, X-efficiency.
    Opis:
    In today’s world the term efficiency gained a status of an imperative at all levels of economic activity (micro, mezo, macro) as well as in all sectors of the economy (private, public, non-profit). The prevalence of “efficiency” in scientific discussions discloses existence of a number of approaches to the understanding of this concept as well as existence of conceptual differences regarding the essence of efficiency, resulting from different ideological foundations of relevant economic theories. This study distinguishes between two analytical approaches: 1) static efficiency – conceptually inscribed in the paradigm of neoclassical economics, 2) dynamic efficiency – developed on the grounds of heterodox evolutionary economics. Within these two theoretical approaches various types of efficiency have been identified and characterized. This resulted in a typology that established a conceptual framework for clarifying different meanings of the term “efficiency”.
    Źródło:
    Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace; 2013, 4; 13-42
    2082-0976
    Pojawia się w:
    Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Role of Economic Efficiency in Competition Law
    Autorzy:
    Jurczyk, Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/530221.pdf
    Data publikacji:
    2017-12-31
    Wydawca:
    Uniwersytet Warszawski. Wydawnictwo Naukowe Wydziału Zarządzania
    Tematy:
    dynamic efficiency
    economic efficiency
    efficient competition
    innovations
    static efficiency
    tying
    Opis:
    The main focus of the paper is the function of economics in the current application of competition law. While advocating further economization of the law, it is seen as necessary to widen the extent to which aspects of economic efficiency encompassing static and dynamic efficiency are taken into consideration in an antitrust analysis. Much attention is devoted to these issues, while clarifying what is meant by them, how they are to be understood and implemented in the practice of antitrust authorities, as well as discussing their importance for the promotion of innovation. It is noted that accounting for the economic efficiency aspects differently in the light of competition law allows for the assessment of the market behavior of dominant companies, which traditionally has been seen as anticompetitive. This main issue of the paper is analyzed extensively and explained using the case of Microsoft, a company accused by the US and EU antitrust authorities of abusing its dominant position on the market of operating systems in that it integrated the sale of its base product Windows OS exclusively with other applications (Media Player and Internet Explorer). The differences presented in the research part of the paper as to the way Microsoft was treated by these authorities originated in their different methodology of analysis and assessment of the effects of the sales model launched by Microsoft for products offered to the PC manufacturers and their users, in spite of the US and EU antitrust authorities adopting the same evaluation standard – consumer welfare. Aspects of dynamic efficiency adequate in the assessment of the behavior of innovative firms holding a dominant position proved to be deciding. On the other side of the Atlantic, taking into account the aspects of dynamic efficiency was crucial in coming up with a lighter assessment of Microsoft’s tying compared to the European authorities’ assessment which was based largely on the structural analysis, where the benefits arising from dynamic efficiency are not visible. It is clear from the decisions made by the Commission that it favours regulation over effects generated by competition forces at a later time.
    Źródło:
    Yearbook of Antitrust and Regulatory Studies; 2017, 10(16); 107-126
    1689-9024
    2545-0115
    Pojawia się w:
    Yearbook of Antitrust and Regulatory Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prakseologiczna ocena użyteczności metody DEA w diagnozie efektywności organizacji
    Praxeological evaluation of the usefulness of the DEA method in the diagnosis of organizational efficiency
    Autorzy:
    Nowak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/202855.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    efektywność dynamiczna
    metoda DEA
    prakseologia
    dynamic efficiency
    data envelopment analysis
    praxeology
    Opis:
    Data Envelopment Analisys (DEA) jest w ostatnich latach jedną z najczęściej stosowanych metod diagnozy efektywności organizacji. W literaturze przedmiotu brakuje jednak publikacji, stanowiących refleksję metodologiczną odnoszącą się do zakresu użyteczności metody DEA i ograniczeń, które wiążą się z jej stosowaniem. Niniejsze opracowanie stanowi odpowiedź na zaobserwowaną w tym zakresie niszę. Celem artykułu jest dokonanie oceny użyteczności metody DEA w diagnozie efektywności organizacji na gruncie teoretycznym w świetle prakseolo-gicznej koncepcji efektywności dynamicznej. Osiągnięcie założonego celu wymagało przedstawienia istoty metody DEA, jej historycznych konotacji oraz zarysu prakseologicznej koncepcji efektywności dynamicznej.
    Data Envelopment Analisys (DEA)isin recent years, one of the most common methods of diagnosis efficiency of the organization. In the literature there is no publication, which reflect methodological relating to the scope of the usefulness of the DEA and the limitations that are associated with its use. This study is a response to observed in this area niche. The aim of this article is to assess the usefulness of DEA method in the diagnosis of organizational efficiency theoretically in the light of the praxeological concept of dynamic efficiency. Achieving the objective pursued require the presentation of the essence of the DEA method, its historical connotations and outline praxeological concept of dynamic efficiency.
    Źródło:
    Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie; 2015, 66; 101-112
    0239-9415
    Pojawia się w:
    Zeszyty Naukowe Politechniki Poznańskiej. Organizacja i Zarządzanie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Insider understanding of country development: a novel application of Optimal Control Theory and Data Envelopment Analysis for benchmarking performance of Chilean and Brazilian companies
    Autorzy:
    Alves Junior, Paulo Nocera
    Yushimito, Wilfredo F.
    Gude, Jorge Pereira
    Melo, Isotilia Costa
    Rebelatto, Daisy Aparecida do Nascimento
    Powiązania:
    https://bibliotekanauki.pl/articles/14430662.pdf
    Data publikacji:
    2019-03-27
    Wydawca:
    Wyższa Szkoła Bankowa we Wrocławiu
    Tematy:
    Data Envelopment Analysis (DEA)
    Optimal Control Theory (OCT)
    Dynamic Efficiency
    Developing Countries
    Inventory Control
    Production-Inventory System
    Benchmarking
    Best Practices.
    Opis:
    Aim: If companies manage their inventory inefficiently, inventory costs can increase significantly due to shortages, overstocking, and risks. Inventory management is critical for company’s success which, in turn, impacts on countries’ development. This paper aims to investigate the efficiency of inventory control systems of companies from Brazil and Chile through Optimal Control Theory and Data Envelopment Analysis. Design/Research methods: Data was collected from Chilean and Brazilian companies covering different industries in which both countries are mostly dependent A new approach using OCT and DEA is applied for dealing with inventory, production, and demand in Dynamic DEA model to benchmark companies’ production-inventory systems. Conclusions/findings: The results show efficient companies among evaluated industries. Such companies are related mainly to Brazilian commerce and Chilean exports. Based on findings, it was possible to identify patterns and relationship among companies and its inventory management. Originality/value of the article: This paper fills a gap in studies including demand, production, and inventory in Dynamic DEA by using OCT to forewarn unrealistic results and observing companies’ behavior. Besides that, this approach is particularly useful for developing countries in this context, determining benchmarks for the most inefficient firms in each sector. Implications of the research: The results show (1) which companies should focus more on improving inventory management, (2) which companies should be used as benchmarks, and (3) it highlights the reasons of different performance of companies in each country. Limitations of the research: For future research, it is suggested including variables and analysis of social and environmental impacts.
    Źródło:
    Central European Review of Economics and Management; 2019, 3, 1; 47-93
    2543-9472
    Pojawia się w:
    Central European Review of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Testing of efficiency and dynamic effects of a drive system with a lead screw
    Autorzy:
    Lisowski, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/246807.pdf
    Data publikacji:
    2016
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    lead screws
    efficiency
    dynamic effects
    Opis:
    The paper presents experimental studies of a drive system with a lead screw. The concept and the construction of the test stand, its parameters as well as the applied measuring apparatus and the scope of tests are described. Furthermore, a measuring system and a methodology of determining the loads on the nut of the lead screw, based on the strain gauge measurements, were developed. A special nut bracket with specimens for the strain gauge measurement was designed. Since the specimens are simultaneously subjected to tension, two plane bending and non–free torsion, a coefficient essential for determining the torque on the nut of the lead screw was estimated based on the finite element analysis of the nut bracket under complex load condition. The first part of experimental studies includes the determination of the efficiency of the lead screw and the efficiency of the typical drive system with the lead screw. The impact of the load level and the constant resistance in the system are included in the research. The second part of the study concerns the determination of dynamic load coefficients for various operating parameters. The efficiency of the lead screw and the efficiency of a typical drive system with the lead screw as well as the dynamic factors at start–up and braking were determined based on experimental tests referred to a ball screw.
    Źródło:
    Journal of KONES; 2016, 23, 4; 297-304
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Industrial Plants Performance Evaluation Using Dynamic Dea
    Autorzy:
    Kluczek, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/409144.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    dynamic DEA
    energy efficiency
    industrial plants
    slacks-based measure approach
    Opis:
    The objective of the paper is to evaluate the energy efficiency performance of industrial plants based on energy audit measures using dynamic Data Envelopment Analysis. The paper demonstrates a three-stage DEA based on slacks-based measure approach to evaluate the energy efficiency of U.S. industrial plants. Also, a 3-step approach to select relevant variables to be employed in slacks-based measure model. The paper has revealed inefficiencies of industrial plants, which were considered as efficient ones examined individually in energy audit procedure. The results indicate that half of analyzed plants are not performing at high energy efficiency, given a total of 6 facilities were operating efficiently. It shows that these industrial plants appear to have the potential to reduce their energy use and cost. Moreover, the results were enriched with the additional analysis of input excesses and output shortfalls and further suggestions for improving energy efficiency are provided.
    Źródło:
    Research in Logistics & Production; 2016, 6, 5; 465-476
    2083-4942
    2083-4950
    Pojawia się w:
    Research in Logistics & Production
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Efficiency measurement in dynamic two-stage network structures with flexible intermediate materials
    Autorzy:
    Kordrostami, S.
    Seyedboveir, S.
    Daneshian, B.
    Amirteimoori, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/406486.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    data envelopment analysis
    flexible factors
    dynamic two-stage network
    efficiency
    Opis:
    Data envelopment analysis (DEA) is a nonparametric method for evaluating the relative efficiency of decision making units (DMUs) described by multiple inputs and multiple outputs. Since DEA was introduced in the 1970s, it has been widely applied to measure the efficiency of a wide variety of production and operation systems, including two-stage production systems with a series or parallel structure. The outputs from the first stage to the next stage are called intermediate factors (or measures). In some real applications, an intermediate material or some part of it can become the final output or input to the second stage of production. Previously existing models cannot be employed directly to measure the efficiency of such systems. The authors introduce a dynamic DEA model that identifies the structure of flexible intermediate factors to maximise the measure of overall system efficiency.
    Źródło:
    Operations Research and Decisions; 2018, 28, 3; 63-76
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Decision support system for water adapting pricing policy
    Autorzy:
    Berbeka, K.
    Bhulai, S.
    Magiera, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/94889.pdf
    Data publikacji:
    2018
    Wydawca:
    Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
    Tematy:
    dynamic pricing system
    water price
    efficiency of water consumption
    demand management
    Opis:
    In the paper, the conception of Enterprise Information Portal (EIP) as an enduser interface of Simulation and Modeling System for Business (SMS-B) is presented. The system is a proposition of Business Intelligence education platform. EIP portals are also a base for Enterprise Integration Platform (EIP II) introduction in information and communication system in an institution.
    Źródło:
    Information Systems in Management; 2018, 7, 2; 97-107
    2084-5537
    2544-1728
    Pojawia się w:
    Information Systems in Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    6-stroke engine: thermodynamic modelling and design for testing
    Autorzy:
    Nimsiriwangso, Atip
    Barnes, Paul
    Doustdar, Omid
    Wyszynski, Miroslaw L.
    Mohyeldin, Gasim Mohamed Maisara
    Kowalski, Miroslaw
    Powiązania:
    https://bibliotekanauki.pl/articles/241771.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    six-stroke engine
    water injection
    steam expansion
    engine efficiency
    dynamic gas model
    Opis:
    In the study AVL BOOST™ is used to perform a thermodynamic simulation of a six-stroke engine, being built by a research team based in Saudi Arabia. The six-stroke cycle consists of a standard four-stroke Otto Cycle followed by a heat recovering steam expansion cycle. Water is injected into the hot combustion chamber towards the end of the Otto expansion stroke producing steam, which is used to perform work on a piston. This process produces power using waste heat and therefore increases the overall efficiency of the engine. The Robin EY28D engine, which is a single cylinder, four-stroke, gasoline engine was used for this simulation study. The engine was modelled and converted into six-stroke engine in AVL BOOST. The results show that six-stroke engine is more efficient than four-stroke engine. In six-stroke engine, the engine power is increased by 33.1% and brake specific fuel consumption (BSFC) is decreased by approximately 16%. Where emissions are concerned, Nitrogen Oxide (NOx) emission from six-stroke engine is reduced by 80%, while the Hydrocarbon (HC) emission increases by 85% compared with the original 4-stroke. Moreover, the most efficient camshaft was found and designed according to the most efficient valve profile for this engine, which is combination of 60CA° of valve duration and 10 mm of valve lifting.
    Źródło:
    Journal of KONES; 2019, 26, 2; 93-106
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effective Approach for Data Aggregation in Wireless Sensor Network: a Structure Free Approach
    Autorzy:
    Prasad, U.
    Adane, D. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/108713.pdf
    Data publikacji:
    2014
    Wydawca:
    Społeczna Akademia Nauk w Łodzi
    Tematy:
    wireless sensor networks
    throughput
    delay
    energy efficiency
    protocols
    event based
    dynamic
    Data Aggregation
    Opis:
    Wireless Sensor Network consist of thousands sensor node which have limited Power, Computation, Sensing and Communication capabilities. Among all operation of Sensor Node, Wireless Communication consumes most of the energy. So it is necessary to decrease the number of packets transmitted through the network. Many Sensor Node could detect similar event, which increases the overall bandwidth utilization to transmit redundant data. Here Nodes computation is cheaper than communication in terms of energy. So the technique of Data Aggregation is applied to summarize data which decreases the amount of data transmitted in the network, which in turn increases the lifetime of the network. Many Data aggregation protocols are based on a structured approach which is suitable for data collection application. But maintenance of the structure is an extra overhead and this approach is not suitable for dynamic scenario. So we propose an ad-hoc data aggregation protocol for dynamic scenario mainly event based application.
    Źródło:
    Journal of Applied Computer Science Methods; 2014, 6 No. 1; 55-65
    1689-9636
    Pojawia się w:
    Journal of Applied Computer Science Methods
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of fuel cells under static and dynamic conditions
    Autorzy:
    Szwajca, Filip
    Berger, Andrew W.
    Spalletta, Robert
    Pielecha, Ireneusz
    Powiązania:
    https://bibliotekanauki.pl/articles/32101706.pdf
    Data publikacji:
    2022-12-28
    Wydawca:
    Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
    Tematy:
    fuel cell stack
    fuel cell module
    static and dynamic characteristics
    fuel cell efficiency
    Opis:
    Modern internal combustion powertrains are the main source of propulsion for on-road and non-road vehicles. However, they are increasingly being replaced by electric or fuel cell-equipped alternative propulsion systems. The article presents a study of fuel cell characteristics operating under both static and dynamic conditions, with a 1.2 kW fuel cell set with a voltage converter and lead-acid batteries. In the conducted tests, the fuel cell stack's maximum efficiency reached 65%. Load tests (static and dynamic) have indicated higher fuel cell efficiencies when using hybrid operation with a DC/DC converter and battery.
    Źródło:
    Rail Vehicles/Pojazdy Szynowe; 2022, 3-4; 44-52
    0138-0370
    2719-9630
    Pojawia się w:
    Rail Vehicles/Pojazdy Szynowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dylematy rozwoju energetyki w Polsce
    Dilemmas of development of power industry in Poland
    Autorzy:
    Pyka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/324537.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    energetyka krajowa
    efektywność energetyczna
    perspektywa dynamiczna
    national power industry
    energy-related efficiency
    dynamic perspective
    Opis:
    W artykule wyeksponowano efektywność dynamiczną jako właściwą do oceny zasadności realizacji celów społeczno-gospodarczych państwa czy regionu w perspektywie strategicznej. Na podstawie przyjętej perspektywy dynamicznej oceny efektywności zaproponowano metodę badania efektywności energetycznej przez pryzmat osiągniętych korzyści.
    Author pays special attention to dynamic efficiency which is considered as suitable to be a base for the assessment of relevance of accomplishment of social-economic goals of country or region in strategic perspective. Based on assumed dynamic perspective there is a proposal for the method of examination of energy-related efficiency with regard to achieved benefits.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2016, 93; 425-439
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Istota efektywności. Definicje i wymiary
    Defining efficiency and it’s dimensions
    Autorzy:
    Pyszka, Adrian
    Powiązania:
    https://bibliotekanauki.pl/articles/591909.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    Efektywność
    Podejście dynamiczne
    Podejście statyczne
    Skuteczność
    Wydajność
    Dynamic approach
    Effectiveness
    Efficacy
    Efficiency
    Static approach
    Opis:
    Efektywność jest pojęciem złożonym i posiadającym wiele synonimów, zarówno w literaturze polskiej, jak i zagranicznej. Artykuł jest próbą ukazania sposobów definiowania efektywności z poziomu ogólnego pojęcia, a także z perspektywy ekonomicznej i behawioralnej. Celem artykułu jest ukazanie różnorodności w definiowaniu efektywności oraz identyfikacja jej wymiarów i dynamiki, umożliwiając lepsze dopasowanie działania do oczekiwanych efektów w danej organizacji. Autor wskazuje na konieczność analizy efektywności z innej perspektywy, bardziej ewolucyjnej, zakładając że im bardziej efektywność przesuwa się z rachunku ekonomicznego działania w stronę oceny potencjału analizowanych rozwiązań, tym wyższy będzie jej poziom w dłuższym okresie czasu.
    Efficiency is a complex notion and having a lot of synonyms, both in Polish and foreign literature. This article is an attempt to show the ways to define effectiveness as a general concept, as well as describing the essence of economic and behavioral perspective. This article aims to show the diversity, dimensions, and dynamics in defining the effectiveness, allowing a better match to the expected effects of activities in the organization. The author indicates the need to evaluate the effectiveness in evolutionary manner, assuming that the bigger change from economic efficiency assessment toward the evaluation of the potential of solutions, the higher will be the level in the long term.
    Źródło:
    Studia Ekonomiczne; 2015, 230; 13-25
    2083-8611
    Pojawia się w:
    Studia Ekonomiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parallel anisotropic mesh refinement with dynamic load balancing for transonic flow simulations
    Autorzy:
    Gepner, S.
    Majewski, J.
    Rokicki, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/202281.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    parallel CFD
    adaptation
    dynamic load balancing
    mesh refinement
    parallel efficiency
    CFD
    dostosowanie
    dynamiczne obciążenia
    wydajność
    modele siatkowe
    Opis:
    The present paper discusses an effective adaptive methods suited for use in parallel environment. An in-house, parallel flow solver based on the residual distribution method is used for the solution of flow problems. Simulation is parallelized based on the domain decomposition approach. Adaptive changes to the mesh are achieved by two distinctive techniques. Mesh refinement is performed by dividing element edges and a subsequent application of pre defined splitting templates. Mesh regularization and derefinement is achieved through topology conserving node movement (r-adaptivity). Parallel implementations of an adaptive use the dynamic load balancing technique.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 195-207
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The concept of determining the ship’s route based on the capability plots
    Autorzy:
    Wnorowski, J.
    Łebkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/24201401.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    capability plots
    searching algorithms
    graph searching
    pathfinding
    Energy Efficiency
    dynamic positioning
    anchor-based positioning systems
    thrusters force allocation
    Opis:
    Every year, new vessels equipped with dynamic positioning (DP) systems are built in shipyards around the world. Due to the increasing number of offshore vessels, a client hiring a vessel should analyse the vessel's positioning capability charts to determine which water areas the vessel is designed for. These charts are represented as polar diagrams. In the centre of the chart is a shape symbolising the ship's body, and the values on the chart represent the maximum wind speed that can affect the ship at a given angle, at which the vessel will maintain its position. Vessel capability charts can also be used by the crew during thrusters failures to determine at what angle to the wind direction the vessel should stand to minimise the impact of wind forces. Analyses that determine a vessel's ability to keep position can be performed by classification societies or other companies with approval from classification societies. The article presents the concept of a pathfinding algorithm to determines the route of the ship’s passage with minimal energy consumption. The algorithm uses the information about environmental forces affecting the ship and information about thrust allocation obtained from Capability Plots.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2023, 17, 1; 193--197
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the excitation frequency on operations of the vibratory conveyor allowing for a sudden stopping of the transport
    Autorzy:
    Czubak, Piotr
    Surówka, Witold
    Powiązania:
    https://bibliotekanauki.pl/articles/2146602.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    vibratory conveyor
    dynamic eliminator
    transport stopping
    variable efficiency
    feeder
    przenośnik wibracyjny
    eliminator dynamiczny
    zatrzymanie transportu
    wydajność zmienna
    podajnik
    Opis:
    Transport possibilities of the new vibratory conveyor in dependence on the excitation frequency of inertial vibrators were investigated in the hereby paper. The comprehensive model of the machine together with the loose feed material was tested. Simulations allowed to determine the dependence of the transport velocity on the excitation frequency. The time needed for a sudden stopping of the transport was also investigated. The new controlling strategy, realised by means of the excitation frequency, was proposed for situations when there is a necessity of sudden stopping of the transport.
    Źródło:
    Vibrations in Physical Systems; 2020, 31, 3; art. no. 2020303
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Oil leakage in a variable-height gap between the cylinder block and the valve plate in a piston pump
    Przecieki oleju w szczelinie o zmiennej wysokosci pomiedzy blokiem cylindrowym i tarcza rozdzielacza pompy tlokowej
    Autorzy:
    Zloto, T.
    Sochacki, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/792038.pdf
    Data publikacji:
    2011
    Wydawca:
    Komisja Motoryzacji i Energetyki Rolnictwa
    Tematy:
    oil leakage
    variable height gap
    cylinder block
    valve plate
    piston pump
    dynamic viscosity
    energy efficiency
    computation model
    flow intensity
    Źródło:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa; 2011, 11C
    1641-7739
    Pojawia się w:
    Teka Komisji Motoryzacji i Energetyki Rolnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the Possibility of Using Dynamic Methods for Assessment of Investment Projects in the Domestic Foundry Industry
    Autorzy:
    Szymszal, J.
    Lis, T.
    Gajdzik, B.
    Kliś, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380393.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    computer-aided foundry production
    dynamic methods for assessment
    investment projects
    efficiency calculus
    odlewnia
    komputerowe wspomaganie produkcji
    projekty inwestycyjne
    rachunek efektywności
    Opis:
    A comparative analysis involving the evaluation of the effectiveness of investment projects can be based on various rules indicating selection of the most favorable decisions. The dynamic methods for assessment of investment projects discussed in this article, which consider the possibility of modifying the predetermined investment options, are quite complex and difficult to implement. They are used both in the construction phase of the new company, as well as in its subsequent modernization. The assessments should be characterized by a high coefficient of the economic efficiency. The, observed in practice, high dynamic variability of both the external and internal conditions under which the company operates is the reason why in the process of calculating the economic efficiency of investment projects, there is a significant number of random parameters affected by high uncertainty and risk. Investments in the metallurgical industry are characterized by a relatively long cycle of implementation and operation. These are capital-intensive projects and often mistakenly taken investment decisions end in failure of the investment project and, consequently, in the collapse of the company. In addition, the applied methods of risk assessment of investment projects, especially the dynamic ones, should be fully understood by managerial staff and constitute an easy to use, yet accurate tool for improving the efficiency of the company.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3; 103-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zastosowanie teorii odnowy w racjonalizacji okresu eksploatacji środków transportu
    The application of the renewal theory in rationalizing the period of operation of transport measures
    Autorzy:
    Cisowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/313347.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Naukowo-Wydawniczy "SPATIUM"
    Tematy:
    teoria odnowy
    eksploatacja środków transportu
    programowanie dynamiczne
    efektywność zarządzania
    renewal theory
    operation of means of transport
    dynamic programming
    management efficiency
    Opis:
    W pracy pokazano zastosowanie teorii odnowy do wyznaczania optymalnego czasu eksploatacji środków transportu. Rozwiązanie tego typu oparto na programowaniu dynamicznym. Przedstawiono przykład obliczeń dla samochodu marki MAN TGS 18.400.
    The use of the regeneration theory to determine the optimal operating time of means of transport is shown in the paper. The solution of this problem is based on dynamic programming. An example of calculations for MAN TGS 18.400.
    Źródło:
    Autobusy : technika, eksploatacja, systemy transportowe; 2018, 19, 6; 380-383, CD
    1509-5878
    2450-7725
    Pojawia się w:
    Autobusy : technika, eksploatacja, systemy transportowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atesting capabilities of a new test rig, with a planetary gear unit examined as an example
    Możliwości badawcze nowego stanowiska na przykładzie przekładni planetarnej
    Autorzy:
    Pawelski, Z.
    Uszpolewicz, G.
    Zdziennicki, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/263202.pdf
    Data publikacji:
    2017
    Wydawca:
    Sieć Badawcza Łukasiewicz. Przemysłowy Instytut Motoryzacji
    Tematy:
    power-circulating test rig
    planetary gear unit
    mesh and signature frequencies
    vibrations and their FFT analysis
    kinematic gear ratio
    dynamic gear ratio
    noise level
    efficiency measurements
    efficiency adjusted to a uniform oil temperature
    stanowisko z mocą krążącą
    przekładnia planetarna
    częstotliwości charakterystyczne i zazębienia
    drgania i analiza fft
    przełożenie kinematyczne
    przełożenie dynamiczne
    poziom hałasu
    pomiary sprawności
    sprawność korygowana do określonej temperatury oleju
    Opis:
    The article describes a test rig built at the Department of Vehicles and Fundamentals of Machine Design, Lodz University of Technology (TUL), for static and dynamic examination of vehicle and machinery driveline components. Adequate installed power of the propulsion system and extensive instrumentation of the test rig makes it possible to examine various prototype mechanical transmission units with power capacities of up to several ten kilowatts and to carry out a broad spectrum of measurements with high accuracy. During the tests, such variables as vibrations in any direction, gear shaft speeds, torques, noise levels, and various oil parameters, e.g. temperature, moisture content, or ferromagnetic debris content, may be recorded. Additional equipment enables precise alignment of all the rotating parts in the test rig drive train and determination of oil viscosity before and after the test. An important feature of the test rig is a possibility of changing the drive direction without demounting the object under test. This can be done thanks to an inverter control system, which enables electric machine operation modes to be switched over from motor to generator and vice versa. In the subsequent part of the article, selected results of testing a planetary gear unit with a geometric gear ratio of 3.1372 have been presented, which include efficiency, FFT analysis of vibrations, and noise level data. The test results have confirmed the suitability of the test rig for multipurpose applications and for comprehensive diagnosing of driveline components.
    W artykule opisano stanowisko do statycznych i dynamicznych badań podzespołów układów napędowych zbudowane w Katedrze Pojazdów i Podstaw Budowy Maszyn Politechniki Łódzkiej. Moc urządzeń napędowych zainstalowana na stanowisku, pozwala na badanie różnych prototypów przekładni mechanicznych o mocach do kilkudziesięciu kilowatów a bogate jego oprzyrządowanie umożliwia przeprowadzenie szerokiego spektrum pomiarów z wysoką dokładnością. W trakcie badań rejestrowane są takie zmienne jak drgania w dowolnym kierunku, prędkości obrotowe wałów przekładni, momenty obrotowe, poziom hałasu oraz parametry oleju takie jak temperatura, zawartość wilgoci i ścieru ferromagnetycznego. Dodatkowe wyposażenie umożliwia precyzyjne ustawienie współosiowe wszystkich elementów wirujących w linii napędowej stanowiska oraz określenie lepkości oleju przed i po badaniach. Istotną cechą stanowiska jest możliwość zamiany kierunku napędu bez demontażu badanego obiektu, co jest możliwe dzięki układowi sterowania falownikami umożliwiającemu zmianę charakteru pracy maszyn elektrycznych z silnika na generator i odwrotnie. W dalszej części przedstawiono wybrane wyniki badań przekładni planetarnej o przełożeniu kinematycznym 3,1372: określenie sprawności, analizę częstotliwościową drgań oraz poziom hałasu. Badania potwierdziły uniwersalność stanowiska i możliwość wszechstronnego diagnozowania podzespołów układów napędowych.
    Źródło:
    Archiwum Motoryzacji; 2017, 77, 3; 111-132
    1234-754X
    2084-476X
    Pojawia się w:
    Archiwum Motoryzacji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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