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    Wyświetlanie 1-11 z 11
    Tytuł:
    Determining horizontal curvature of railway track axis in mobile satellite measurements
    Autorzy:
    Koc, Władysław
    Wilk, Andrzej
    Specht, Cezary
    Karwowski, Krzysztof
    Skibicki, Jacek
    Czaplewski, Krzysztof
    Judek, Sławomir
    Chrostowski, Piotr
    Szmagliński, Jacek
    Dąbrowski, Paweł
    Specht, Mariusz
    Grulkowski, Sławomir
    Licow, Roksana
    Powiązania:
    https://bibliotekanauki.pl/articles/2086882.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    GNSS measurements
    railway track axis
    horizontal curvature
    moving chord method
    application
    accuracy assessment
    pomiary GNSS
    tor kolejowy
    oś
    krzywizna pozioma
    metoda ruchomej cięciwy
    zastosowanie
    ocena dokładności
    Opis:
    The article discusses the applicability of a novel method to determine horizontal curvature of the railway track axis based on results of mobile satellite measurements. The method is based on inclination angle changes of a moving chord in the Cartesian coordinate system. In the presented case, the variant referred to as the method of two virtual chords is applied. It consists in maneuvering with only one GNSS (Global Navigation Satellite System) receiver. The assumptions of the novel method are formulated, and an assessment of its application in the performed campaign of mobile satellite measurements is presented. The shape of the measured railway axis is shown in the national spatial reference system PL-2000, and the speed of the measuring trolley during measurement is calculated based on the recorded coordinates. It has been observed that over the test section, the curvature ordinates differ from the expected waveform, which can be caused by disturbances of the measuring trolley trajectory. However, this problem can easily be overcome by filtering the measured track axis ordinates to obtain the correct shape – this refers to all track segments: straight sections, circular arcs and transition curves. The virtual chord method can also constitute the basis for assessing the quality of the recorded satellite signal. The performed analysis has shown high accuracy of the measuring process.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 6; e139204, 1--10
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of positioning methods using Global Navigation Satellite Systems (GNSS) in Polish State Railways (PKP)
    Autorzy:
    Specht, Mariusz
    Szmagliński, Jacek
    Specht, Cezary
    Koc, Władysław
    Wilk, Andrzej
    Czaplewski, Krzysztof
    Karwowski, Krzysztof
    Dąbrowski, Paweł S.
    Chrostowski, Piotr
    Grulkowski, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/906101.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    rail transport
    global navigation satellite system (GNSS)
    satellite receiver
    European Train Control System (ETCS)
    train positioning system
    Polish State Railways (PKP)
    Opis:
    Each year, global navigation satellite systems (GNSS) improve their accuracy, availability, continuity, integrity, and reliability. Due to these continual improvements, the systems are increasingly used in various modes of transport, including rail transport, the subject of this publication. GNSS are used for rail passenger information, rail traffic management, and rail traffic control. These applications differ in the positioning requirements that satellite navigation systems must meet. This article presents the methods and systems of rolling stock location and tracking using the Polish State Railways (PKP) as an example. The information on the equipment used for train positioning is not specified anywhere, hence they may differ, even for the same multiple units travelling in different parts of the country. In addition, the publication presents the progress of the European Train Control System (ETCS) implementation by the PKP.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 62 (134); 26-35
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atypical application of the parametric method for track infrastructure inventory
    Autorzy:
    Czaplewski, Krzysztof
    Specht, Cezary
    Koc, Władysław
    Wilk, Andrzej
    Karwowski, Krzysztof
    Dąbrowski, Paweł
    Specht, Mariusz
    Chrostowski, Piotr
    Szmaglinski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/906041.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    inland navigation
    alignment methods
    navigation infrastructure
    navigation
    tracks
    data analysis
    Opis:
    For many years, satellite systems have seen widespread use in a variety of technical applications, as well as in operations related to setting-out and the exploitation of track infrastructure. Their main applications include an inventory of the trackage course and detecting changes in its position. In both of these tasks, the most important element that determines the quality of an analyses is the high accuracy of the determinations being carried out. Satellite surveying techniques are not always sufficiently accurate, and in such cases, it is necessary to employ other land surveying methods to process surveying data. This article presents the authors’ considerations with regards to the possibility of applying one of the most common land surveying adjustment methods, the parametric method, to operations related to an inventory of tram infrastructure in Gdańsk. The results are based on surveys carried out during a surveying campaign in the autumn of 2018. The considerations presented in the article concern a small part of the research conducted under project No. POIR.04.01.01-00-0017/17 entitled “Development of an innovative method for determining the precise trajectory of a railborne vehicle” which is being implemented by a consortium of Gdansk University of Technology and Gdynia Maritime University
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2020, 61 (133); 31-38
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correction of determined coordinates of railway tracks in mobile satellite measurements
    Korygowanie wyznaczonych współrzędnych osi toru kolejowego w mobilnych pomiarach satelitarnych
    Autorzy:
    Wilk, Andrzej
    Specht, Cezary
    Koc, Wladyslaw
    Karwowski, Krzysztof
    Skibicki, Jacek
    Czaplewski, Krzysztof
    Chrostowski, Piotr
    Dabrowski, Pawel S.
    Grulkowski, Sławomir
    Judek, Slawomir
    Specht, Mariusz
    Szmagliński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/328601.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    track geometric layout
    GNSS/INS/MLS measurements
    RTK measurements
    data processing
    układ geometryczny toru
    pomiary GNSS/INS/MLS
    pomiary mobilne RTK
    przetwarzanie danych
    Opis:
    This article examines one of the basic issues related to the technique of mobile satellite measurements in railway tracks. This problem concerns the correction of the determined coordinates of the track centerline. The need to perform this operation results from the GNSS receivers positioning at a certain height above the level of the existing track axis, leading to longitudinal and lateral shifts of antennas. The key problem here is the determination of the local horizontal coordinate system in each measured position. For the analysis, the authors defined the directional baseline vector of the measuring platform on the basis of positions given by two satellite antennas, positioned over the pivots of its bogies. This work presents the procedure for determining the corrections values.
    W pracy poruszono jedną z podstawowych kwestii związanych z techniką mobilnych pomiarów satelitarnych w torze kolejowym – korygowanie wyznaczonych współrzędnych osi toru. Konieczność przeprowadzenia tej operacji wynika z ustawienia anten GNSS na pewnej wysokości nad poziomem istniejącej osi toru, przy występowaniu jego pochylenia w kierunku podłużnym i poprzecznym. Kluczowym problemem staje się przy tym konieczność określania w każdym punkcie pomiarowym kierunków osi układu współrzędnych w płaszczyźnie poziomej. W omawianej metodzie posłużono się kierunkowym wektorem bazowym, wyznaczonym na podstawie współrzędnych anten usytuowanych nad czopami skrętów obydwu wózków platformy. W pracy przedstawiono procedurę określania wartości korekt.
    Źródło:
    Diagnostyka; 2020, 21, 3; 77-85
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Macroeconomic imbalance procedure (MIP) scoreboard indicators and their predictive strength of ?multidimensional crises?
    Autorzy:
    Biegun, Krzysztof
    Karwowski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/22444434.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Badań Gospodarczych
    Tematy:
    macroeconomic imbalance procedure
    economic crisis
    multidimensional crisis
    ordered probit model
    Opis:
    Research background: The evaluation of the predictive strength of MIP indicators in relation to crises is extremely important for the process of coordinating the economic policies of the EU countries. MIP is one of the pillars of the economic crisis prevention procedure. Predictive power of individual indicators has not been tested before their introduction. Purpose of the article: Evaluation of the predictive strength of fourteen MIP indicators in relation to multidimensional crises in the EU countries. Methods: We used ordered probit model to test the ability of MIP indicators to correctly predict episodes of ?multidimensional crises? (as defined by the authors) in the period between 2008 and 2017 in all EU Member States. Findings & Value added: We defined ?multidimensional crises?, combining several negative phenomena into one limited dependent variable. This work is also novel in its application of probit regression to test the predictive strength of MIP indicators with an ordered probit model. We identified five MIP variables which were statistically significant in predicting ?multidimensional crises? for all EU countries: net international investment position, nominal unit labour cost index, house price index, private sector credit flow and general government gross debt. Other variables turned out to be less important or not effective in crises prediction.
    Źródło:
    Equilibrium. Quarterly Journal of Economics and Economic Policy; 2020, 15, 1; 11-28
    1689-765X
    2353-3293
    Pojawia się w:
    Equilibrium. Quarterly Journal of Economics and Economic Policy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Installation of GNSS receivers on a mobile railway platform – methodology and measurement aspects
    Autorzy:
    Dąbrowski, Paweł S.
    Specht, Cezary
    Koc, Władysław
    Wilk, Andrzej
    Czaplewski, Krzysztof
    Karwowski, Krzysztof
    Specht, Mariusz
    Chrostowski, Piotr
    Szmagliński, Jacek
    Grulkowski, Sławomir
    Powiązania:
    https://bibliotekanauki.pl/articles/135238.pdf
    Data publikacji:
    2019
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    BRIK
    GNSS
    railway measurements
    railway track
    railway track axis
    staking out
    electronic total station
    Opis:
    Determining the course of a railway track axis using satellite methods relies on ensuring the precise assembly of GNSS receivers in dedicated measuring devices. Depending on the number of receivers, solutions that are based on placing the apparatus directly above the railway track axis (as well as in eccentric positions) are used to indirectly obtain data to form the basis of the desired results. This publication describes the installation of five GNSS receivers on a mobile measuring platform as part of the InnoSatTrack project. The methodology and the procedure of the geodetic measurements required to obtain the geometrical configuration of the measuring apparatus, specified in the technical project, are presented. The publication presents the principles of total station measurement methods as well as the steps taken to achieve precise results from staking out. The process of acquiring the same configuration of the GNSS receivers, based on the geometry of the squares on the two measuring platforms that were used in the research, has been shown. The final determination of the position of the receivers did not exceed an error of 0.010 m with an average error of 0.003 m, despite the occurrence of mounting difficulties. The results have demonstrated the high credibility and effectiveness of the presented solution.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2019, 60 (132); 18-26
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Argumenty przeciw „pieniądzom z helikoptera”
    Autorzy:
    Karwowski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/610853.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    quantitative and qualitative easing
    helicopter money
    Bitcoin
    luzowanie ilościowe i jakościowe
    Opis:
    Since the outbreak of the latest financial crisis central banks in several countries have decided to apply non-conventional monetary policy measures. Other monetary authorities behaved more conventionally but conducted a very loose monetary policy anyway. The goal of the paper is to discuss threats and possible consequences of treating the money instrumentally (monetary easing, government financing by the central bank). The authorities tend to arbitrary reinforce just one function of money, a medium of exchange, in order to artificially increase the sales and production of goods and services while neglecting other major function: a store of value. Fast growing money aggregates, awareness that there is no limit for money creation, and ideas such as “helicopter money” stimulate the attempts to storage the wealth in different form, e.g. cryptocurrency. The remarks were formulated from the conventional and Islamic finance perspective. Statistical data come from the euro area, Poland, and Iran, where banking system is fully Islamic.
    Po wybuchu ostatniego kryzysu finansowego banki centralne szeregu krajów zaczęły wykorzystywać niekonwencjonalne instrumenty polityki pieniężnej, zaś inne, choć pozostały przy bardziej tradycyjnych instrumentach, stosowały mało restrykcyjną politykę. Celem artykułu jest omówienie niebezpieczeństw i potencjalnych konsekwencji traktowania pieniądza w sposób instrumentalny (luzowanie ilościowe i finansowanie długu publicznego przez bank centralny). Władze państwowe mają tendencję do kładzenia nacisku na tylko jedną funkcję pieniądza, a mianowicie jako środka cyrkulacji, by w sztuczny sposób zwiększyć sprzedaż oraz produkcję towarów i świadczenie usług, przy jednoczesnym lekceważeniu innej ważnej funkcji: środka tezauryzacji. Szybko rosnące agregaty monetarne, świadomość, że nie ma tak naprawdę ograniczeń w kreacji pieniądza, jak również pomysły typu „pieniądz z helikoptera” powodują, że na znaczeniu zyskują pomysły, jak przechowywać bogactwo w innej formie, np. w kryptowalutach. Rozważania w artykule są prowadzone z perspektywy dwóch konwencjonalnych banków centralnych (EBC, NBP) i jednego islamskiego (Bank Centralny Iranu).
    Źródło:
    Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia; 2017, 51, 5
    0459-9586
    Pojawia się w:
    Annales Universitatis Mariae Curie-Skłodowska, sectio H – Oeconomia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Central Counterparties from the Islamic Finance Perspective
    Autorzy:
    Karwowski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/629845.pdf
    Data publikacji:
    2015
    Wydawca:
    Szkoła Główna Handlowa w Warszawie
    Tematy:
    Islam finance, central counterparties
    Opis:
    The paper focuses on central counterparties (CCPs) becoming the buyer to everyseller and the seller to every buyer and thereby ensuring the performance of opencontracts. The role of CCPs increased considerably after outbreak of the crisisin 2008.In 2012 BIS and IOSCO published the Principles for financial market (post-trade)infrastructures. The aim of the paper is to find out whether, and if yes – to whatextent, the mentioned principles have to be modified when applied to CCP servingIslamic financial institutions. It seems that all principles are appropriate forIslamic finance, however some of them should be modified in order to be Shariacompliant.Moreover, in some cases the modification might also be difficult dueto lack of standardized instruments.
    Źródło:
    Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace; 2015, 3, 3; 27-40
    2082-0976
    Pojawia się w:
    Kwartalnik Kolegium Ekonomiczno-Społecznego Studia i Prace
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    1000 Liver Transplantations at the Department of General, Transplant and Liver Surgery, Medical University of Warsaw - Analysis of Indications and Results
    Autorzy:
    Krawczyk, Marek
    Grąt, Michał
    Barski, Krzysztof
    Ligocka, Joanna
    Antczak, Arkadiusz
    Kornasiewicz, Oskar
    Skalski, Michał
    Patkowski, Waldemar
    Nyckowski, Paweł
    Zieniewicz, Krzysztof
    Grzelak, Ireneusz
    Pawlak, Jacek
    Alsharabi, Abdulsalam
    Wróblewski, Tadeusz
    Paluszkiewicz, Rafał
    Najnigier, Bogusław
    Dudek, Krzysztof
    Remiszewski, Piotr
    Smoter, Piotr
    Grodzicki, Mariusz
    Korba, Michał
    Kotulski, Marcin
    Cieślak, Bartosz
    Kalinowski, Piotr
    Gierej, Piotr
    Frączek, Mariusz
    Rdzanek, Łukasz
    Stankiewicz, Rafał
    Kobryń, Konrad
    Nazarewski, Łukasz
    Leonowicz, Dorota
    Urban-Lechowicz, Magdalena
    Skwarek, Anna
    Giercuszkiewicz, Dorota
    Paczkowska, Agata
    Piwowarska, Jolanta
    Gelo, Remigiusz
    Andruszkiewicz, Paweł
    Brudkowska, Anna
    Andrzejewska, Renata
    Niewiński, Grzegorz
    Kilińska, Beata
    Zarzycka, Aleksandra
    Nowak, Robert
    Kosiński, Cezary
    Korta, Teresa
    Ołdakowska-Jedynak, Urszula
    Sańko-Resmer, Joanna
    Foroncewicz, Bartosz
    Ziółkowski, Jacek
    Mucha, Krzysztof
    Senatorski, Grzegorz
    Pączek, Leszek
    Habior, Andrzej
    Lechowicz, Robert
    Polański, Sławomir
    Leowska, Elżbieta
    Pacho, Ryszard
    Andrzejewska, Małgorzata
    Rowiński, Olgierd
    Kozieł, Sławomir
    Żurakowski, Jerzy
    Ziarkiewicz-Wróblewska, Bogna
    Górnicka, Barbara
    Hevelke, Piotr
    Michałowicz, Bogdan
    Karwowski, Andrzej
    Szczerbań, Jerzy
    Powiązania:
    https://bibliotekanauki.pl/articles/1396689.pdf
    Data publikacji:
    2012-06-01
    Wydawca:
    Index Copernicus International
    Tematy:
    liver transplantation
    indications
    results
    mortality
    Opis:
    The aim of the study was to analyze indications and results of the first one thousand liver transplantations at Chair and Clinic of General, Transplantation and Liver Surgery, Medical University of Warsaw.Material and methods. Data from 1000 transplantations (944 patients) performed at Chair and Clinic of General, Transplantation and Liver Surgery between 1994 and 2011 were analyzed retrospectively. These included 943 first transplantations and 55 retransplantations and 2 re-retransplantations. Frequency of particular indications for first transplantation and retransplantations was established. Perioperative mortality was defined as death within 30 days after the transplantation. Kaplan-Meier survival analysis was used to estimate 5-year patient and graft survival.Results. The most common indications for first transplantation included: liver failure caused by hepatitis C infection (27.8%) and hepatitis B infection (18%) and alcoholic liver disease (17.7%). Early (< 6 months) and late (> 6 months) retransplantations were dominated by hepatic artery thrombosis (54.3%) and recurrence of the underlying disease (45%). Perioperative mortality rate was 8.9% for first transplantations and 34.5% for retransplantations. Five-year patient and graft survival rate was 74.3% and 71%, respectively, after first transplantations and 54.7% and 52.9%, respectively, after retransplantations.Conclusions. Development of liver transplantation program provided more than 1000 transplantations and excellent long-term results. Liver failure caused by hepatitis C and B infections remains the most common cause of liver transplantation and structure of other indications is consistent with European data.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 6; 304-312
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intelligence and Creativity of Polish Middle-School Students : Looking for the Threshold Hypothesis
    Autorzy:
    Gralewski, Jacek
    Weremczuk, Ewa
    Karwowski, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/45637339.pdf
    Data publikacji:
    2012-09-30
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    intelligence
    creativity
    creative abilities
    threshold hypothesis
    Opis:
    The presented study is devoted to the examination of the threshold hypothesis (TH), which assumes a curvilinear relation between creative abilities and intelligence. The article focuses on methodological problems, particularly on analytical strategies relevant to confirming or refuting the TH. The TH was tested on more than 100 middle-school students. Intelligence was measured by Raven’s Progressive Matrices (RPM) test, and creative abilities by eight divergent production tests measuring fluency and originality of thinking. Different criteria of acceptance / rejection of the TH were applied and discussed. The TH was confirmed when the relation between creative abilities and intelligence under the threshold was greater than zero, while above the threshold it was not different from zero (the so-called A strategy). However, the TH was refuted when differences in the strength of the correlation below and above the assumed threshold of intelligence were compared (B and C strategies).
    Źródło:
    The New Educational Review; 2012, 29; 328-338
    1732-6729
    Pojawia się w:
    The New Educational Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Reklasyfikacja meteorytu Pułtusk
    Autorzy:
    Pilski, Andrzej S.
    Karwowski, Łukasz
    Siemiątkowski, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1032861.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Meteorytowe
    Tematy:
    Pułtusk meteorite
    meteorites
    ordinary chondrite
    Źródło:
    Acta Societatis Metheoriticae Polonorum; 2011, 2; 194
    2080-5497
    Pojawia się w:
    Acta Societatis Metheoriticae Polonorum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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