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    Wyświetlanie 1-38 z 38
    Tytuł:
    Analiza numeryczna przepływu ziaren materiału sypkiego i gazu w energetyce – studium wybranych przypadków
    Autorzy:
    Zarzycki, Robert
    Grajcar, Magdalena
    Damasiewicz, Mariusz
    Wiński, Mateusz
    Smigielski, Jacek
    Hepner, Wojciech
    Kobyłecki, Rafał
    Krawczyk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/chapters/25418025.pdf
    Data publikacji:
    2023-12-07
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    modelowanie przepływów
    fluidyzacja
    kocioł fluidalny
    kotły energetyczne
    Opis:
    W pracy przedstawiono problematykę modelowania przepływów materiału sypkiego i gazu na przykładzie kotła fluidalnego na parametry nadkrytyczne. Zaprezentowano podstawowe wiadomości o problematyce modelowania urządzeń energetycznych, w tym kotłów fluidalnych. Na podstawie wybranych przypadków dokonano analizy przepływu spalin i materiału cyrkulującego w leju komory paleniskowej, przepływu w komorze paleniskowej i cyklonach kotła. Na podstawie uzyskanych wyników można ocenić charakter przepływu materiału sypkiego i gazu w poszczególnych elementach kotła oraz zaproponować niezbędne modernizacje lub poprawę jego geometrii w celu ograniczenia występujących problemów.
    Źródło:
    Czysta energia i środowisko; 53-71
    9788371939044
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Color vision assessment following cataract surgery using anomaloscope
    Autorzy:
    Zabel, Jacek
    Michalak, Krzysztof Piotr
    Olszewski, Jan
    Koszałkowski, Maciej
    Przekoracka-Krawczyk, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2046657.pdf
    Data publikacji:
    2021-12-27
    Wydawca:
    Medical Education
    Tematy:
    cataract
    color vision deficits
    anomaloscope
    Moreland test
    Ray leigh test
    Opis:
    Aim: To evaluate the impact of cataract on color vision detection using an anomaloscope. Methods: 12 patients aged 64–82 years with history of cataract surgery in one eye and mature cataracts in the other eye were examined for color vision using the Rayleigh and the Moreland anomaloscope tests. Results: Different patterns of blue and green color vision deterioration have been observed in the eye with cataract as compared to the IOL eye. A decrease in M1 to approximately 1 (the minimum of the Moreland test scale) was observed in 5 out of 12 participants, whereas an increase in M2 to 99 (the maximum of the Moreland test scale) was observed in 6 out of 12 subjects. R1 found in the Rayleigh test was significantly lower in the cataract eyes as compared to the IOL eyes (38.9 ± 2.3 vs. 43.4 ± 1.6; p < 0.001). Conclusions: It has been shown that cataract causes a decrease in color sensitivity, especially affecting green and blue colors. Following IOL implantation, the previously deteriorated vision of green and blue was clearly improved. The most valuable parameters of the anomaloscope test, which enable to determine cataract severity, were M1, M2 and R1.
    Źródło:
    OphthaTherapy; 2021, 8, 4; 265-273
    2353-7175
    2543-9987
    Pojawia się w:
    OphthaTherapy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Challenges related to unmanned aerial vehicles
    Autorzy:
    Tomaszycki, Marek
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1427324.pdf
    Data publikacji:
    2020
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    UAV
    NBR
    UAVO
    VLOS/BVLOS
    drone
    BSP
    bezzałogowy statek powietrzny
    dron
    Opis:
    The Regulation of the European Parliament and of the Council (EC) No. 2018/1139 (known as NBR - New Basic Regulation) on common rules in the field of civil aviation was introduced in order to regulate the issue of UAVs - Unmanned Aerial Vehicles, in all weight categories. It represents a new regulatory approach, which is of major importance in the field of European aviation legislation. Until the new regulation came into force, UAVs with a maximum take-off weight (MTOM) below 150 kg were subject to the regulations of authorities of individual EU Member States. The NBR introduced by implementing acts in the field of UAV forces the national aviation authorities of states to change the regulations currently in force. The most important issues that need to be standardised include the requirement to enter UAVs with the MTOW equal to or lower than 25 kg in the aircraft register, granting the BVLOS (Beyond Visual Line of Sight) fight approval and the UAVO (Unmanned Aerial Vehicle Operator) certification process. In the author's opinion, what may be difficult and dangerous for safety in the airspace is the transitional period. During that time, manufacturers, airspace users and ATS (Air Traffic Service) will have to perform their tasks keeping in mind that it is a period when the new legal regulations currently prepared for entry into force will affect the entire sector related to unmanned aviation, which will also have an impact on manned aviation. Purpose: The purpose of the article is to discuss the basic challenges posed by the currently developed technology of unmanned aerial vehicles. Method: The scientific methods used in the paper include analysis, criticism of the literature on the subject and logical construction. Results: The article shows the differences between the existing regulations and those proposed by the European Commission and EASA (European Union Aviation Safety Agency). In addition, it presents the process of granting the approval to perform air operations by manned aircraft.
    Źródło:
    Przegląd Nauk o Obronności; 2020, 5, 9; 103-115
    2450-6869
    Pojawia się w:
    Przegląd Nauk o Obronności
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stratygraficzne i przestrzenne aspekty zróżnicowania składu chemicznego późnoplejstoceńskich sekwencji lessowo-glebowych w Polsce – przykłady profili w Tyszowcach i Białym Kościele
    The stratigraphic and spatial aspects of the differentiation of the chemical composition of the Late Pleistocene loess-palaeosol sequences in Poland – a case study of the Tyszowce and Biały Kościół profiles
    Autorzy:
    Skurzyński, Jacek
    Jary, Zdzisław
    Raczyk, Jerzy
    Moska, Piotr
    Krawczyk, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/578343.pdf
    Data publikacji:
    2017
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Tematy:
    less,
    gleba kopalna
    geochemia
    wskaźniki wietrzeniowe
    metoda chemostratygraficzna
    loess
    palaeosol
    geochemistry
    weathering indices
    chemostratigraphic method
    Opis:
    Artykuł prezentuje porównanie składu geochemicznego i stopnia zwietrzenia chemicznego dwóch późnoplejstoceńskich sekwencji lessowo-glebowych, zlokalizowanych w SE i SW Polsce. Analiza chemiczna w zakresie pierwiastków głównych (Si, Al, Fe, Mn, Mg, Ca, Na, K, Ti, P) oraz wyliczonych na ich podstawie wskaźników (CIA, Ti/Al, K/Al, Mg/Ca, K/Ca, Na/K oraz Si/Al) wykazała, że obie sekwencje są zróżnicowane zarówno w ujęciu stratygraficznym, jak i przestrzennym. Zmienność stratygraficzna związana jest ze zmianami paleoklimatu warunkującymi natężenie zarówno procesów lito-, jak i pedogenezy. Zmienność przestrzenna może wynikać m.in. z odmiennych warunków klimatycznych w trakcie tworzenia się sekwencji lessowo-glebowych, recyklingu lessów lub nawet odmiennego źródła materiału. Istotna może być też dysproporcja miąższości sekwencji, skutkująca zróżnicowanym wpływem infiltracji wód opadowych.
    The article presents the comparison of the geochemical composition and the degree of chemical weathering between two Late Pleistocene loess-palaeosol sequences of SE and SW Poland. The results of major element (Si, Al, Fe, Mn, Mg, Ca, Na, K, Ti, P) and geochemical index (CIA, Ti/Al, K/Al, Mg/Ca, K/Ca, Na/K oraz Si/Al) analyses indicate stratigraphical and spatial differentiation between sequences. The stratigraphic differentiation is connected with palaeoclimatic conditions which control the intensity of pedogenesis. The spatial variability may be attributed to different climatic conditions during the deposition of loess, the loess recycling process, or even to different source areas. The disproportion between the thicknesses of the loess covers can also be important. It can affect the rainwater infiltration effect.
    Źródło:
    Acta Geographica Lodziensia; 2017, 106; 87-103
    0065-1249
    Pojawia się w:
    Acta Geographica Lodziensia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Własności Przeciwarytmiczne I Hypotensyjne Nowych Analogów Teofiliny
    Antiarrhythmic and Hypotensive Activity of New Analogues of Theophylline
    Autorzy:
    Sapa, Jacek
    Zygmunt, Małgorzata
    Krawczyk, Łukasz
    Dudek, Magdalena
    Bednarski, Marek
    Nowiński, Leszek
    Knutelska, Joanna
    Chłoń-Rzepa, Grażyna
    Pawłowski, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/1034048.pdf
    Data publikacji:
    2013
    Wydawca:
    Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
    Tematy:
    hypotensive activity
    theophylline antiarrhythmic activity
    Opis:
    On the basis of our earlier studies in the group of 7,8-disubstituted derivatives of 1,3-dimetyl-3,7-dihydro-purine-2,6-dione, some new derivatives of theophylline were synthesized and tested for their electrocardiographic, antiarrhythmic and hypotensive activity as well as for α1-adrenoreceptor affinities. The performed preliminary tests indicated that new compounds did not significantly affect the normal ECG in vivo. As the result of present studies it may be concluded that all compounds did not possess hypotensive and arrhythmic activity. The results of the binding assays on α1-adrenergic receptors showed, that these derivatives display no affinity for α1-adrenergic receptors. Lack of antiarrhythmic and antihypertensive activity may result from the absence of affinity for the α1-adrenergic receptor. Performed chemical modifications lead to the loss of pharmacological activity previously observed among other derivatives in this group. Generally in comparison with the previously reported derivatives, replacing the phenoxyethylpiperazine by other moiety, changed the antiarrhythmic and hypotensive activity.
    Źródło:
    Medicina Internacia Revuo; 2013, 25, 100; 128-135
    0465-5435
    Pojawia się w:
    Medicina Internacia Revuo
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Doświadczenia polskich ośrodków zajmujących się leczeniem pacjentów z rdzeniowym zanikiem mięśni.
    Clinical, multicenter treatment of patients with spinal muscular atrophy - the experience in Poland
    Autorzy:
    Ogrodnik, Magdalena
    Chmielewski, Dariusz
    Szwinge, Anna
    Mazurkiewicz-Bełdzińska, Maria
    Pruszczyk, Anna Kostera
    Giza, Wojciech
    Szymańska, Małgorzata
    Kierkus-Dłużyńska, Karina
    Łusakowska, Anna
    Wójcik, Adrianna
    Frączek, Anna
    Czyżyk, Elżbieta
    Michalska, Joanna
    Krawczyk, Magdalena Chrościńska
    Pilch, Jacek
    Kotulska-Jóźwiak, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2165288.pdf
    Data publikacji:
    2022
    Wydawca:
    Polskie Towarzystwo Neurologów Dziecięcych
    Tematy:
    rdzeniowy zanik mięśni
    SMA
    opieka
    leczenie
    nusinersen
    skolioza
    komplikacje
    przebieg choroby
    kopie SMN
    demograficzne dane
    cechy kliniczne
    optymalizacja leczenia
    analiza statystyczna
    spinal muscular atrophy
    healthcare
    treatment
    scoliosis
    complications
    burden of illness
    age
    SMN2 copies
    demographics
    clinical features
    medication optimization
    statistical data analysis
    Opis:
    Rdzeniowy zanik mięśni (Spinal Muscular Atrophy, SMA) jest genetycznie uwarunkowanym postępującym schorzeniem charakteryzującym się przedwczesnym obumieraniem komórek ruchowych rdzenia kręgowego, którym szacunkowo w Polsce dotkniętych jest obecnie ok. 1200 osób. W pracy zaprezentowana jest analiza odpowiedzi na zaproponowaną przez autorów ankietę badawczą, która została rozesłana do ponad 30 krajowych ośrodków leczących SMA, zarówno u pacjentów dorosłych jak i dotkniętych nią dzieci. Zgromadzone dane o blisko 247 leczonych w Polsce pacjentów dorosłych oraz 286 dzieci, pozwoliły przy użyciu zaawansowanych narzędzi statystycznych, na wyciągnięcie istotnych wniosków dotyczących obecnej sytuacji terapeutycznej SMA w skali kraju. Ustalono rozkład wiekowy pacjentów z SMA i na jej podstawie wyznaczono zmiany wartości średniej masy ciała i jej mediany w zależności od typu SMA i liczby kopii genu SMN2. Przeanalizowano zależność występowania skoliozy oraz czynników ryzyka jej wystąpienia u pacjentów z SMA. W tym kontekście przedstawiono również dane dotyczące obecnych metod leczenia pacjentów, w szczególności z wykorzystaniem nusinersenu i wskazano główną przyczynę zaprzestania terapii tym preparatem. Dane przedstawione w pracy mogą być przydatne w optymalizacji oraz ocenie skuteczności leczenia. Jednocześnie praca nakreśla podstawowy obraz doświadczenia pacjenta i opiekuna z SMA w erze po leczeniu, w tym zmiany jakości życia z roku na rok w wyniku stosowania nowych terapii i lepszej opieki.stanu zagrożenia życia. Celem pracy jest podsumowanie informacji na temat dotychczas opublikowanych objawów neurologicznych COVID-19 w populacji pediatrycznej, ocena możliwych patomechanizmów ich powstawania oraz porównanie z objawami występującymi u dorosłych.
    Spinal Muscular Atrophy (SMA) is a genetically determined progressive disease characterized by the premature death of motor cells of the spinal cord, which currently affects approximately 1,200 people in Poland. The study presents an analysis of responses in the research questionnaire sent to over 30 national centers treating SMA, both in adult and children patients. The collected data on 247 adult patients and 286 children treated in Poland was processed with advanced statistical tools. The aim was to draw significant conclusions about the current therapeutic situation of SMA patients in the country. The age distribution was determined. The changes in average and median body weight were established depending on the type of SMA and the number of SMN2 gene copies. The relationship between scoliosis occurrence and risk factors for its occurrence in patients with SMA was analyzed. In this context, data on the current methods of treating patients, particularly with the use of nusinersen, was presented and the main reason for discontinuing the medication was indicated. Finally, the work outlines a basic picture of the patient’s and caregiver’s experience with SMA in the post-treatment era, including changes in quality of life, year by year, due to new therapies and better care.
    Źródło:
    Neurologia Dziecięca; 2021-2022, 31-32, 60; 11-25
    1230-3690
    2451-1897
    Pojawia się w:
    Neurologia Dziecięca
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Segmentation of bone structures with the use of deep learning techniques
    Autorzy:
    Krawczyk, Zuzanna
    Starzyński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2173574.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    deep learning
    semantic segmentation
    U-net
    FCN
    ResNet
    computed tomography
    technika deep learning
    głęboka nauka
    segmentacja semantyczna
    tomografia komputerowa
    Opis:
    The paper is focused on automatic segmentation task of bone structures out of CT data series of pelvic region. The authors trained and compared four different models of deep neural networks (FCN, PSPNet, U-net and Segnet) to perform the segmentation task of three following classes: background, patient outline and bones. The mean and class-wise Intersection over Union (IoU), Dice coefficient and pixel accuracy measures were evaluated for each network outcome. In the initial phase all of the networks were trained for 10 epochs. The most exact segmentation results were obtained with the use of U-net model, with mean IoU value equal to 93.2%. The results where further outperformed with the U-net model modification with ResNet50 model used as the encoder, trained by 30 epochs, which obtained following result: mIoU measure – 96.92%, “bone” class IoU – 92.87%, mDice coefficient – 98.41%, mDice coefficient for “bone” – 96.31%, mAccuracy – 99.85% and Accuracy for “bone” class – 99.92%.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; art. no. e136751
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Segmentation of bone structures with the use of deep learning techniques
    Autorzy:
    Krawczyk, Zuzanna
    Starzyński, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2128158.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    deep learning
    semantic segmentation
    U-net
    FCN
    ResNet
    computed tomography
    technika deep learning
    głęboka nauka
    segmentacja semantyczna
    tomografia komputerowa
    Opis:
    The paper is focused on automatic segmentation task of bone structures out of CT data series of pelvic region. The authors trained and compared four different models of deep neural networks (FCN, PSPNet, U-net and Segnet) to perform the segmentation task of three following classes: background, patient outline and bones. The mean and class-wise Intersection over Union (IoU), Dice coefficient and pixel accuracy measures were evaluated for each network outcome. In the initial phase all of the networks were trained for 10 epochs. The most exact segmentation results were obtained with the use of U-net model, with mean IoU value equal to 93.2%. The results where further outperformed with the U-net model modification with ResNet50 model used as the encoder, trained by 30 epochs, which obtained following result: mIoU measure – 96.92%, “bone” class IoU – 92.87%, mDice coefficient – 98.41%, mDice coefficient for “bone” – 96.31%, mAccuracy – 99.85% and Accuracy for “bone” class – 99.92%.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 3; e136751, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water parameters and species composition of macrophytes in reclamation lakes in the area of a former sulphur borehole mine (SE Poland)
    Autorzy:
    Krawczyk, Rafał
    Lis, Łukasz
    Urbaniak, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/763851.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej
    Tematy:
    post-mining lakes, sulphur mining, reclamation, aquatic vegetation, spontaneous succession, Jeziórko, SE Poland
    Opis:
    Macrophytes and selected physical-chemical water properties were studied in 17 post-mining lakes of Jeziórko Sulphur Mine – one of the largest borehole sulphur mines in the world. Artificial lakes were constructed in subsidence depressions during the reclamation process of mining fields. They were characterized by high mineralization – conductivity ranged from 723 to 2295 μS/cm. The reaction was near neutral, or more frequently, slightly alkaline. Concentrations of phosphorus and organic matter were low. In the group of hydrophytes, Ceratophyllum demersum, Myriophyllum spicatum, Najas marina, Utricularia vulgaris, Eleocharis acicularis, Potamogeton pectinatus, Potamogeton natans and Potamogeton pusillus were frequently dominant. In several lakes, large macroscopic algae dominated – charophytes forming large, dense Chara meadows. In marsh communities, Phragmites australis was the most expansive. Reclamation process had a positive effect on diversity, some of the species found in the study area are regionally rare, including one species which is threatened in Poland (Najas minor). No alien species were recorded.
    Źródło:
    Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia; 2016, 71, 1
    2083-3563
    0066-2232
    Pojawia się w:
    Annales Universitatis Mariae Curie-Sklodowska, sectio C – Biologia
    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:
    Evolution Of The Results Of 1500 Liver Transplantations Performed In The Department Of General, Transplant And Liver Surgery Medical University Of Warsaw
    Autorzy:
    Krawczyk, Marek
    Grąt, Michał
    Grąt, Karolina
    Wronka, Karolina
    Krasnodębski, Maciej
    Stypułkowski, Jan
    Masior, Łukasz
    Hołówko, Wacław
    Ligocka, Joanna
    Nyckowski, Paweł
    Wróblewski, Tadeusz
    Paluszkiewicz, Rafał
    Patkowski, Waldemar
    Zieniewicz, Krzysztof
    Pączek, Leszek
    Milkiewicz, Piotr
    Ołdakowska-Jedynak, Urszula
    Najnigier, Bogusław
    Dudek, Krzysztof
    Remiszewski, Piotr
    Grzelak, Ireneusz
    Kornasiewicz, Oskar
    Kotulski, Marcin
    Smoter, Piotr
    Grodzicki, Mariusz
    Korba, Michał
    Kalinowski, Piotr
    Skalski, Michał
    Zając, Krzysztof
    Stankiewicz, Rafał
    Przybysz, Marta
    Cieślak, Bartosz
    Nazarewski, Łukasz
    Nowosad, Małgorzata
    Kobryń, Konrad
    Wasilewicz, Michał
    Raszeja-Wyszomirska, Joanna
    Piwowarska, Jolanta
    Giercuszkiewicz, Dorota
    Sańko-Resmer, Joanna
    Rejowski, Sławomir
    Szydłowska-Jakimiuk, Monika
    Górnicka, Barbara
    Wróblewska-Ziarkiewicz, Bogna
    Mazurkiewicz, Michał
    Niewiński, Grzegorz
    Pawlak, Jacek
    Pacho, Ryszard
    Powiązania:
    https://bibliotekanauki.pl/articles/1395614.pdf
    Data publikacji:
    2015-05-01
    Wydawca:
    Index Copernicus International
    Tematy:
    liver transplantation
    survival
    outcomes
    donors
    center experience
    center volume
    Opis:
    Liver transplantation is a well-established treatment of patients with end-stage liver disease and selected liver tumors. Remarkable progress has been made over the last years concerning nearly all of its aspects. The aim of this study was to evaluate the evolution of long-term outcomes after liver transplantations performed in the Department of General, Transplant and Liver Surgery (Medical University of Warsaw). Material and methods. Data of 1500 liver transplantations performed between 1989 and 2014 were retrospectively analyzed. Transplantations were divided into 3 groups: group 1 including first 500 operations, group 2 including subsequent 500, and group 3 comprising the most recent 500. Five year overall and graft survival were set as outcome measures. Results. Increased number of transplantations performed at the site was associated with increased age of the recipients (p<0.001) and donors (p<0.001), increased rate of male recipients (p<0.001), and increased rate of piggyback operations (p<0.001), and decreased MELD (p<0.001), as well as decreased blood (p=0.006) and plasma (p<0.001) transfusions. Overall survival was 71.6% at 5 years in group 1, 74.5% at 5 years in group 2, and 85% at 2.9 years in group 3 (p=0.008). Improvement of overall survival was particularly observed for primary transplantations (p=0.004). Increased graft survival rates did not reach the level of significance (p=0.136). Conclusions. Long-term outcomes after liver transplantations performed in the Department of General, Transplant and Liver Surgery are comparable to those achieved in the largest transplant centers worldwide and are continuously improving despite increasing recipient age and wider utilization of organs procured from older donors.
    Źródło:
    Polish Journal of Surgery; 2015, 87, 5; 221-230
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Viability theory: an applied mathematics tool for achieving dynamic systems sustainability
    Autorzy:
    Krawczyk, Jacek B.
    Pharo, Alastair S.
    Powiązania:
    https://bibliotekanauki.pl/articles/748128.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    viability theory, differential inclusions, sustainability
    Opis:
     Sustainability is considered an issue of paramount importance; yet scientists andpoliticians still seek to understand what it means, practically and conceptually, tobe sustainable. This paper's aim is to introduce viability theory, a relativelyyoung branch of continuous mathematics which provides a conceptual frameworkthat is very well suited to sustainability problems.  In particular, viability theory can be used toanswer important questions about the sustainability of systems, including thosestudied in macroeconomics, and can be used to determine sustainable policies fortheir management.  The principal analytical tool of viability theory is theviability kernel which is the set of all state-space points such that it is possible for evolutions starting from each of those points to remain within the system's predetermined constraints indefinitely. Although, in some circumstances,  kernel determinationcan be performed analytically,  most practical results in viability theory rely on graphical approximations of viability kernels,which for nonlinear and high-dimensional problems can only be approached numerically.This paper provides an outline of the coreconcepts of viability theory and an overview of the numerical approachesavailable for computing approximate viability kernels.  \vikaasa{}, aspecialised software application developed by the authors and designed tocompute such approximate viability kernels is presented along-side examples ofviability theory in action in the spheres of bio-economics and macroeconomics.
    Źródło:
    Mathematica Applicanda; 2013, 41, 1
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Koncepcja rozbudowy miejskiego transportu tramwajowego w Częstochowie
    Concept for the expansion of urban tramway transport in Częstochowa
    Autorzy:
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2202939.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Komunikacji Rzeczpospolitej Polskiej
    Tematy:
    transport miejski
    transport zbiorowy
    transport szynowy
    transport tramwajowy
    urban transport
    collective transport
    rail transport
    tram transport
    Opis:
    W artykule przedstawiono propozycję rozwoju miejskiego transportu szynowego w odniesieniu do stanu obecnie funkcjonującego w Częstochowie. Ocenie poddano nie tylko stan wykorzystywanej infrastruktury z uwzględnieniem miejskiego operatora transportu zbiorowego, ale przede wszystkim koncepcje rozwoju w formule „1+ 2+ 3+”, w odniesieniu do konkretnych linii tramwajowych. Z uwagi na najbardziej zaawansowane przygotowania do budowy nowej linii tramwajowej do dzielnicy Parkitka (3+), poddana analizie została zasadność obecnie realizowanej obsługi transportem autobusowym w dzielnicy. Przedstawiona została także ocena zastąpienia transportu autobusowego transportem szynowym z symulacją rozkładu potencjalnych nowych linii na odcinku od dzielnicy Tysiąclecie do Wojewódzkiego Szpitala Specjalistycznego w dzielnicy Parkitka. Ponadto, oceniono zapotrzebowanie na tabor, który obsłużyłby nowy układ linii tramwajowej nr 3 i obsługę nowej linii nr 4 relacji Północ-Parkitka.
    The article presents a proposal for the development of urban rail transport in relation to the state of affairs at present in Częstochowa. Not only the state of the used infrastructure was evaluated with respect to the municipal public transport operator, but above all the development concepts in the formula “1+ 2+ 3+” in relation to specific tram lines. Due to the most advanced preparations for the construction of a new tram line to the Parkitka district (3+), the validity of the currently implemented bus transport service in the district was analysed. An assessment of the replacement of bus transport by rail transport was also presented with a simulation of the timetable of potential new lines on the section from the Tysiąclecie district to the Regional Specialist Hospital in the Parkitka district. In addition, the need for rolling stock to serve the new layout of tram line no. 3 and to serve the new North-Parkitka line no. 4 was assessed.
    Źródło:
    Transport Miejski i Regionalny; 2022, 3; 10--18
    1732-5153
    Pojawia się w:
    Transport Miejski i Regionalny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Losy życiowe młodych mężczyzn, którzy w nieletniości popełnili co najmniej jedno przestępstwo pod wpływem alkoholu
    Life Histories of Young Males Guilty as Juveniles of at Least One Offence Committed While Intoxicated
    Autorzy:
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/698526.pdf
    Data publikacji:
    1993
    Wydawca:
    Polska Akademia Nauk. Instytut Nauk Prawnych PAN
    Tematy:
    młodzi mężczyźni
    nieletni przestępcy
    losy życiowe
    przestępstwa
    alkohol
    badania kryminologiczne
    young males
    juvenile delinquents
    life histories
    offences
    alcohol
    criminological research
    Opis:
    A study of two 100-person groups of juvenile delinquents born in 1959 was conducted in the years 1981‒1985 at the Department of Criminology, Institute of Legal Studies, Polish Academy of Sciences. The first (experimental) group consisted of boys randomly selected from the total of 225 juveniles born in 1959 who had committed at least on offence while intoxicated. The other (control) group were 100 randomly juveniles selected from the entire population of 8196 juvenile delinquents born in 1959. None of the juveniles selected for the experimental group happened to find themselves in the control group as well. As shown by the findings, the juveniles who had committed at least one offence while intoxicated were much more demoralized as a group than the whole of juvenile delinquents. It seemed interesting, therefore, to follow the further fates of both groups as adults. The follow-up period was 7 years; until that time, all of the examined persons reached the age of 25 when the average Polish man be- comes stabilized to some extent, having graduated from university, worked for several or a dozen years (upon completion of secondary or elementary education respectively), and frequently having also established a family.  Data on the life situation of the young men from both examined groups on their 25th birthday were obtained from the following four sources: ‒ the Central Register of Convicted Persons kept  by the Ministry of Justice, and the Register of Convicted and Detained Persons where criminal records of the entire sample were checked; ‒ files of criminal cases of all men with criminal records (47.0% of the experimental and 35.0% of the control group); the files concerned criminal proceedings before common courts for offences committed after coming of age; ‒ questionnaire survey of 63.0% of the experimental and 66.0% of the control group; ‒ inquiry submitted to the sobering-up stations concerning the entire sample. As shown by the findings, 24.0% of the experimental and 13.0% of the control group established their own families before the age of 25. The proportions are high, as regards the experimental group in particular: erly in the 1980s, the newly married constituted about 10% of the total male population aged 20‒24 in Poland. The mean educational level was higher in the control compared to the experimental group; this concerns first  and foremost  cases of education higher than the elmementary technical (of which there were two in the experimental compared to ten in the control group). Moreover, no cases of illiteracy could be found in the control group, compared to one such case in the experimental group. Of all the men of the experimental group concerning whom data could be obtained, 80.4% had a regular job, and 19.6% stayed out of job or worked casually. Of the control group, 80.0% had a regular job (33% combining job with school), 18.3% stayed out of job or worked casually, and one person had entered university. The number of convicted persons in the experimental group (47) was larger compared to the control group (35) by 12.0%, the difference being significant. Also relapse into crime was higher in the expenmental group (l5 vs. 11 cases). The first offence committed by those convicted as young adults was mainly one against property: 35 cases in the experimental group (66.0% of all those convicted) and 28 cases in the control group (80.0%). The second most frequent offence of members of the experimental group was an aggressive act: against life and health, freedom, personal dignity and inviolability (10 persons, i.e. 18.8% of all those convicted). The offences of this type included: bodily injury (Art. 156 of the penal code – 3 persons, i.e. 6.4%); participation in a brawl or beating (Art. 158 and 159 – 1 person, i.e. 2.1%); infringement of bodily inviolability (Art. 182 – 3 persons, i.e. 6.4%); assault against a public functionary (Art. 233 and 234 – 1 person, i.e. 2.1%); insult against  a public functionary (Art. 236 – 1 person, i.e. 2.1%). In the control group, 6 cases of such offences could be found (9.1% of all those convicted);  yet the only offence under Art. 148 1 of the penal code, that is homicide, had been committed by a member of that goup.The other discussed figures and proportions were respectively: Art. l58, 159 – 3 persons, i.e. 8.6%; Art. 182 – 1 person (2.9%); Art. 233, 234 – 1 person (2.9%); and Art. 236 – 1   person (29%). Beside offences, the two groups manifested also other synptoms of social maladjustment. The symptoms found most often in both groups were: “contacts with persons known to the police as delinquent” and stays at the sobering-up station. As regards the experimental group, the third frequent symptom were brawls in the place of residence followed by bad opinion with neighbors, hooliganism, and avoidance of work. In the control group, avoidance of work ranked third, followed by bad opinion with neighbors, hooliganism, and brawls at the place of residence. This ranking of frequency of the symptoms of social maladjustment points to a greater aggressiveness of the young men from the experimental group. On the 63 young men from the experimental group concerning whom data  could be obtained, 62 (98.0%) drank alcohol. In the control group 59 (89.0%) of the 66 concerning whom data could be obtained were drinkers. The group of drinkers included all those who had drunk several times a week already  as juveniles, and 70% of those who had drunk once a week. In the control group, drinkers included 91.7% of those who had drunk as juvoniles (11 of 12 cases). Of those who had drunk as juveniles in the control group, 66.7% (8 cases) were convicted as adults. As shown by the discussed data, young men from the experimental group – those who committed as juveniles at least one offence while intoxicated prove much inferior in terms of the social situation  to other men who also committed offences as juveniles but did not drink alcohol. Therefore, early alcohol consumption among juvenile delinquents is an important factor of a negative prognosis as to the further fates of such persons. A number of postulates have been formulated, addressed at the prosecuting agencies, criminal justice, and institutions designed to assist persons in extraordinary situation. With respect to the present sample, all such postulates acquire special importance and must be met without fail.
    A study of two 100-person groups of juvenile delinquents born in 1959 was conducted in the years 1981‒1985 at the Department of Criminology, Institute of Legal Studies, Polish Academy of Sciences. The first (experimental) group consisted of boys randomly selected from the total of 225 juveniles born in 1959 who had committed at least on offence while intoxicated. The other (control) group were 100 randomly juveniles selected from the entire population of 8196 juvenile delinquents born in 1959. None of the juveniles selected for the experimental group happened to find themselves in the control group as well. As shown by the findings, the juveniles who had committed at least one offence while intoxicated were much more demoralized as a group than the whole of juvenile delinquents. It seemed interesting, therefore, to follow the further fates of both groups as adults. The follow-up period was 7 years; until that time, all of the examined persons reached the age of 25 when the average Polish man be- comes stabilized to some extent, having graduated from university, worked for several or a dozen years (upon completion of secondary or elementary education respectively), and frequently having also established a family.  Data on the life situation of the young men from both examined groups on their 25th birthday were obtained from the following four sources: ‒ the Central Register of Convicted Persons kept  by the Ministry of Justice, and the Register of Convicted and Detained Persons where criminal records of the entire sample were checked; ‒ files of criminal cases of all men with criminal records (47.0% of the experimental and 35.0% of the control group); the files concerned criminal proceedings before common courts for offences committed after coming of age; ‒ questionnaire survey of 63.0% of the experimental and 66.0% of the control group; ‒ inquiry submitted to the sobering-up stations concerning the entire sample. As shown by the findings, 24.0% of the experimental and 13.0% of the control group established their own families before the age of 25. The proportions are high, as regards the experimental group in particular: erly in the 1980s, the newly married constituted about 10% of the total male population aged 20‒24 in Poland. The mean educational level was higher in the control compared to the experimental group; this concerns first  and foremost  cases of education higher than the elmementary technical (of which there were two in the experimental compared to ten in the control group). Moreover, no cases of illiteracy could be found in the control group, compared to one such case in the experimental group. Of all the men of the experimental group concerning whom data could be obtained, 80.4% had a regular job, and 19.6% stayed out of job or worked casually. Of the control group, 80.0% had a regular job (33% combining job with school), 18.3% stayed out of job or worked casually, and one person had entered university. The number of convicted persons in the experimental group (47) was larger compared to the control group (35) by 12.0%, the difference being significant. Also relapse into crime was higher in the expenmental group (l5 vs. 11 cases). The first offence committed by those convicted as young adults was mainly one against property: 35 cases in the experimental group (66.0% of all those convicted) and 28 cases in the control group (80.0%). The second most frequent offence of members of the experimental group was an aggressive act: against life and health, freedom, personal dignity and inviolability (10 persons, i.e. 18.8% of all those convicted). The offences of this type included: bodily injury (Art. 156 of the penal code – 3 persons, i.e. 6.4%); participation in a brawl or beating (Art. 158 and 159 – 1 person, i.e. 2.1%); infringement of bodily inviolability (Art. 182 – 3 persons, i.e. 6.4%); assault against a public functionary (Art. 233 and 234 – 1 person, i.e. 2.1%); insult against  a public functionary (Art. 236 – 1 person, i.e. 2.1%). In the control group, 6 cases of such offences could be found (9.1% of all those convicted);  yet the only offence under Art. 148 1 of the penal code, that is homicide, had been committed by a member of that goup.The other discussed figures and proportions were respectively: Art. l58, 159 – 3 persons, i.e. 8.6%; Art. 182 – 1 person (2.9%); Art. 233, 234 – 1 person (2.9%); and Art. 236 – 1   person (29%). Beside offences, the two groups manifested also other synptoms of social maladjustment. The symptoms found most often in both groups were: “contacts with persons known to the police as delinquent” and stays at the sobering-up station. As regards the experimental group, the third frequent symptom were brawls in the place of residence followed by bad opinion with neighbors, hooliganism, and avoidance of work. In the control group, avoidance of work ranked third, followed by bad opinion with neighbors, hooliganism, and brawls at the place of residence. This ranking of frequency of the symptoms of social maladjustment points to a greater aggressiveness of the young men from the experimental group. On the 63 young men from the experimental group concerning whom data  could be obtained, 62 (98.0%) drank alcohol. In the control group 59 (89.0%) of the 66 concerning whom data could be obtained were drinkers. The group of drinkers included all those who had drunk several times a week already  as juveniles, and 70% of those who had drunk once a week. In the control group, drinkers included 91.7% of those who had drunk as juvoniles (11 of 12 cases). Of those who had drunk as juveniles in the control group, 66.7% (8 cases) were convicted as adults. As shown by the discussed data, young men from the experimental group – those who committed as juveniles at least one offence while intoxicated prove much inferior in terms of the social situation  to other men who also committed offences as juveniles but did not drink alcohol. Therefore, early alcohol consumption among juvenile delinquents is an important factor of a negative prognosis as to the further fates of such persons. A number of postulates have been formulated, addressed at the prosecuting agencies, criminal justice, and institutions designed to assist persons in extraordinary situation. With respect to the present sample, all such postulates acquire special importance and must be met without fail.   Niniejszy artykuł stanowi kontynuację opracowania: Nieletni sprawcy przestępstw popełnionych pod wpływem alkoholu, „Archiwum Kryminologii” 1991, t. XVIII.
    Źródło:
    Archiwum Kryminologii; 1993, XIX; 17-26
    0066-6890
    2719-4280
    Pojawia się w:
    Archiwum Kryminologii
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    NATO Command System and Air Policing in the Polish Airspace
    Autorzy:
    Krawczyk, Jacek
    Tomaszycki, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2086239.pdf
    Data publikacji:
    2021
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    NATO
    NATO structures
    SHAPE
    SACEUR
    CAOC
    Air Policing Mission
    Opis:
    Objectives: The article presents the NATO command structure with particular emphasis on the units responsible for command and control in the Polish airspace. The structure was described at three levels of command: strategic, operational and the tactical level. Moreover, the article also presents the issues concerning sovereignty in the space of the Republic of Poland and the cooperation of civil and military services in relation to the aircraft, which in an unauthorised manner crossed the state air border. Methods: Scientific methods used in the paper are: analysis and criticism of written sources, analysis and logical construction. Results: The article presents the structures of commands responsible for protection and defence of the airspace of NATO countries, their brief characteristics, command relationships and interdependencies between them and the main assumptions and objectives of the Air Policing mission, as well as the principles of implementation of this mission in the Polish airspace. Conclusions: The main purpose of NATO's activities is to protect its member states, as a basis for preserving peace and strengthening international security. The organisational structures of the North Atlantic Treaty Organisation, based on three levels of command, are able to ensure the security of all 30 countries belonging to the alliance. The Polish airspace command system is fully compatible and integrated with the NATO system and in constant readiness to carry out combat missions, including the Air Policing Mission.
    Źródło:
    Przegląd Nauk o Obronności; 2021, 6, 11; 74--88
    2450-6869
    Pojawia się w:
    Przegląd Nauk o Obronności
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nieletni sprawcy przestępstw popełnionych pod wpływem alkoholu
    Juvenile Perpetrators of Offences Committed Under the Influence of Alcohol
    Autorzy:
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/698524.pdf
    Data publikacji:
    1992
    Wydawca:
    Polska Akademia Nauk. Instytut Nauk Prawnych PAN
    Tematy:
    nieletni sprawcy
    przestępstwa
    alkohol
    alkoholizm
    badania kryminologiczne
    juvenile perpetrators
    offences
    alcohol
    alcoholism
    criminological research
    Opis:
    For many years now, excessive drinking has been among the main symptoms of social pathology in Poland. Also the fact is beyond any doubt that  drinking is strongly related to crime: it is ussually found in over a half of offences known to the police committed by adults. The problem of drinking also plays an important part in the process of juvenile demoralization and delinquency. This fact was noticed by the legislator who, in the Act of October 26, 1982 on proceedings in cases of juveniles, situated drinking among the symptoms of demoralization. Among the juveniles found quality of offences, the proportion of those who drink alcohol is quite large, the offenders’ actual age considered. In recent  years, that proportion has been over 11,0% of all juvenile delinquents. There are also among the juveniles found quality of offences those who committed acts  prohibited by law while under the influence of alcohol. In recent years, the proportion of, such juveniles has been over 5,0% and, shows an upward trend. There is among the excessively drinking juvenile delinquents a decided majority of boys, whose proportion has always been over 91,0% in the last 20 years. The paper reports on a national empirical study of two groups of boys born in 1959. The first group consisted of 100 respondents who committed as juveniles at least one offence while under the influence of alcohol. The other group which also consisted of 100 persons (the control group) were boys selected from among the juveniles delinquents who committed offences but did not drink any alcohol before that act. The source of data on the two groups of respondents were: court files; records of implementation of the educational or corrective measures applied by the court, files of criminal cases for offences committed by those persons as adults; questionnaires sent out to sobering-up stations; as well as standarized interviews with the respondents themselves. The study has shown a number of differences between juveniles who commit offences under the influence of alcohol and the remaining juvenile delinquents. The main such differences are as follows: Different types of delinquency in the broad sense: ‒ offences committed under the influence of alcohol were frequently not the first offences of the examined juveniles (44,0% of cases, as compared to 7,0% in the control group); ‒ such offences were usually committed at the age of 15‒16 (93,0%), that is rather late in the juvenile’s career, at the threshold of statutory age: ‒ the offences committed by the first group were decidedly more aggressive and dangerous for the life and health of their victims than those committed by the control group; ‒ nearly 50,0% of the offences committed under the influence of alcohol were commitied in the streets (control group ‒ 39,3%); ‒ the juveniles who committed offences under the influence of alcohol were acting alone nearly 30 times more often than the remaining juvenile deliquents. In the case of boys who committed offences under the influence of alcohol, their state of health, family situation, and ‒ consequently ‒ also scholastic achievements were inferior to those in the control group: ‒ as few as 67,0% of boys in the first group were brought up in complete families (control group ‒ 82,0%); what is more, in 52,3% of those families disturbed functioning was found which was due to: alcoholism, excessive drinking, serious chronic diseases, disablement, mental disorders, delinquency or prostitution of one or both parents; thus as few as about one-third of the families of juveniles who committed offences under the influence of alcohol were fully efficient educational milieu; ‒ 69,0% of the boys who committed offences under the influence of alcohol were educationally neglected by their parents (control group ‒ 53,0%); ‒ 44,0% of the boys who commiited offences under the influence of alcohol (as compared to 25,0% in the control group) had as children suffered from serious diseases that affected their psycho-physical development, organic lesions or diseases of the central nervous system, or slight or minor degrees of mental deficiency; ‒ 7,0% of the boys who committed offences under the influence of alcohol did not go to school despite the fact that education is compulsory at their age (control group – 2%), and 58,0% (70,7% of those who did go to school) were educationally retarded by one to four years (control group – 51,0% that is 52,6% of the school-goers); The degree of social maladjustment was much higher in the boys who committed offences under the influence of alcohol: ‒ nearly a half of juveniles in that group were recidivists (44,0%, as compared to as few as 7,0% in the control group); ‒ 65,0% of the boys who drank (that is, by about one-third more than  among all juvenile delinqents) were cigarette smokers, and had started smoking long before their first contacts with alcohol; ‒ although the number of juveniles who ran away from home was similar in both groups, those who committed offences under the influence of alcohol did that more often and frequently drank alcohol while vagrant; ‒ 85,0% of boys in the first group (by about 20,0% more than among all juvenile delinquents) used to run the streets unsupervised, 79,0% with demoralized friends: ‒ as few as 5,0% of juveniles who committed offences under the infleunce of alcohol showed no symptoms of social maladjustment, other than those offences (23,0% among all juvenile delinquents), and at least three such symptoms were found in 69,0% (45,0% among all juvenile delinquents). In sum, the group of boys who had committed offences under the influence of alcohol in childhood was in many respects „worse'', and frequently much „worse'' than the control group selected from among all juvenile delinquents. Such boys would prove worse still were they compared with a representative sample of all Poles born in 1959. The facts discussed above prove the truth of the statement that juveniles who commit offences under the influences of alcohol are a high risk group compared to properly socialized young persons. They should therefore be submitted to special care by the competent agencies, including in particular family courts; however, no evidence of such care could be found in the study.
    Źródło:
    Archiwum Kryminologii; 1992, XVIII; 183-211
    0066-6890
    2719-4280
    Pojawia się w:
    Archiwum Kryminologii
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Przekraczanie powietrznej granicy państwowej przez państwowe i cywilne uprawnione oraz nieuprawnione statki powietrzne
    Crossing of the air state border by state and civil authorised and unauthorised aircrafts
    Autorzy:
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/98532.pdf
    Data publikacji:
    2018
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    państwowe statki powietrzne
    granica państwa
    FIR EPWW
    Air Policing
    RENEGADE
    state aircrafts
    state border
    Opis:
    Celem artykułu jest przedstawienie sytuacji przekraczania powietrznej granicy państwowej przez cywilne i państwowe uprawnione oraz nieuprawnione statki powietrzne. Przedstawione są również sposoby oddziaływania na statki powietrzne, co do których istnieje prawdopodobieństwo nieautoryzowanego przekroczenia granicy państwowej. Poza tym, opisane są procedury współpracy cywilnych i wojskowych służb operacyjnych podczas realizacji misji Air POLICING. Zgodnie z Konwencją o międzynarodowym lotnictwie cywilnym przekroczenie powietrznej granicy w przestrzenia powietrznym przez cywilny statek powietrzny jest możliwe po spełnieniu konieczności dostosowania się do wymagań przestrzeni powietrznej w której statek powietrzny wykonuje operacje lotniczą. Natomiast wlot obcych państwowych statków powietrznych w przestrzeń powietrzną jest możliwy po udzieleniu specjalnego zezwolenia i musi być zrealizowany zgodnie z warunkami takiego zezwolenia. W artykule omówione są także działania podejmowane gdy statek powietrzny przekroczył granice powietrzną w sposób niezgodny z warunkami lub wykonuje operację lotniczą niezgodnie z zezwoleniem organów służb ruchu lotniczego i mogą być zastosowane w stosunku do niego procedury przyjęte przez krajowe i międzynarodowe organizacje cywilne i wojskowe.
    The aim of the article is to present the situation of crossing the state air border by civil and state authorized and unauthorized aircrafts. There are also presented ways of influencing aircraft, for which there is a probability of unauthorized crossing of the state border. In addition, there are described the procedures cooperation civil and military operational services during the Air POLICING mission. In accordance with the Convention on International Civil Aviation, crossing of the airborne border into airspace by civil aircraft is possible once the need to adapt to the requirements of the airspace in which the aircraft performs air operations is met. However, the entry of foreign state aircraft into the airspace is possible after a special permit has been granted and must be carried out in accordance with the terms of such permission. The article also discusses the actions taken when the aircraft crossed the air borders in a manner inconsistent with the conditions or performs an air operation contrary to the permission of the air traffic services units and procedures adopted by national and international civilian and military organizations may be applied to it.
    Źródło:
    Przegląd Nauk o Obronności; 2018, 3, 6; 1-13
    2450-6869
    Pojawia się w:
    Przegląd Nauk o Obronności
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The era of the unmanned vevicles is coming
    Autorzy:
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/2086235.pdf
    Data publikacji:
    2021
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    new technologies
    UAV
    automation
    unmanned vehicles
    transport processes
    Opis:
    Objectives: The use of Unmanned Vehicles in air, land and water transport is constantly increasing due to their technical and operational capabilities, along with economic advantages. They are used for recreational and commercial purposes by individuals, companies, organisations and state institutions. Particular types of vehicles are at different stages of technical, legislative and implementation advancement. Unmanned vehicles are at different phases of the process of the launch on the market for common use by the public. Railway transport will be the first to undergo widespread and, consequently, full automation, due to the fact that it is already in use and there is a possibility of its safe implementation, which must progress along with the development of technology, science and experience of producers and users. Methods: Scientific methods used in the paper are: analysis and criticism of written sources, analysis and logical construction. Results: The article presents issues concerning the possibility of implementing the use of unmanned vehicles in the air, land and water transport system. The state of advancement of the legislative and technical work has been described, along with the difficulties that can be encountered before the complete implementation of unmanned vehicles into operation. Conclusions: The process of implementing unmanned vehicles into the transport system has begun and it is irreversible. It is a matter of time before unmanned systems are used to transport people and goods. Their use is safer, more economically beneficial and brings benefits to society.
    Źródło:
    Przegląd Nauk o Obronności; 2021, 6, 11; 27--42
    2450-6869
    Pojawia się w:
    Przegląd Nauk o Obronności
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The era of Unmanned Aerial Vehicles is coming
    Autorzy:
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1427343.pdf
    Data publikacji:
    2020
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    UAV
    UAVO
    air accidents
    new technologies
    airspace safety
    bezzałogowe statki powietrzne
    wypadki lotnicze
    nowe technologie
    bezpieczeństwo przestrzeni powietrznej
    Opis:
    The use of UAVs (Unmanned Aerial Vehicles) is constantly increasing due to their technical, operational and economic potential. They are used for recreational and commercial purposes by individuals, companies, organizations and government institutions. Despite the systematic implementation of appropriate safety procedures in air traffic management systems, aviation procedures and safety management systems, it is impossible to completely prevent air accidents. Within 6 months, two air crashes have been reported that involved BEAING 767 Max 8 aircraft. This gives rise to the question whether air accidents involving manned aircraft will become a catalyst for even faster development of UAVs and their greater importance. Purpose: The purpose of the article is to present the potential for the use of UAVs and the measures that should be taken in order to make unmanned aviation competitive against manned aviation. Method: The scientific methods used in the paper include the review and criticism of the literature on the subject, as well as logical analysis and construction. Article type - Review article. Results: The article presents the measures to be implemented in order for unmanned aviation to become competitive against manned aviation and complement other types of transportation services. When introducing new regulations and procedures, the priority should be to ensure the safety of the airspace and other spaces where operations with the use of UAVs will be performed. Conclusions: In order to ensure safety, it is important to equip UAVs with anti-collision devices and airspace detectors informing about any approaching aircraft and obstacles on the actual and potential path, as well as with cameras enabling observation of the airspace around UAVs.
    Źródło:
    Przegląd Nauk o Obronności; 2020, 5, 9; 92-102
    2450-6869
    Pojawia się w:
    Przegląd Nauk o Obronności
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unmanned aerial vehicles : application, legal regulations and challenges
    Autorzy:
    Krawczyk, Jacek
    Tomaszycki, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/98548.pdf
    Data publikacji:
    2019
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    bezzałogowy statek powietrzny
    UAV
    NBR
    operator bezzałogowego statku powietrznego
    UAVO
    regulacje prawne
    przestrzeń powietrzna
    kontrola ruchu lotniczego
    legal regulations
    airspace
    air traffic control
    Opis:
    The advantages of unmanned systems, such as cheaper operation, greater safety, better performance in flight duration or their minimal impact on the natural environment, result in a systematic increase in their significance and development, compared to manned aircraft. Even today the UAVs (Unmanned Aerial Vehicles) and UASs (Unmanned Aerial Systems) play a significant role both in civil, and in military environments, and they are expected to play a growing role in the world air transport and numerous other fields of human activity. At the end of 2018, the European Commission introduced the NBR (New Basic Regulations), regulating issues related to UAVs at a supranational level. This was a significant step towards the integration of manned and unmanned aviation, enabling international UAV flights, subjected to the same regulations of the member states on route of the Unmanned Aerial Vehicle. When introduction of UAVs to the common airspace is considered, the particularly relevant elements include: maintaining the seamless air traffic control, safety, capacity and efficiency of airspace management, and securing environmental protection. The purpose of the present article is to demonstrate the potential UAV applications, present changes in legal regulations, and the challenges faced by the Air Traffic Services and the elements of aviation command. The article presents solutions ensuring an adequate level of safety and smoothness of air traffic in the common airspace for operations carried out by both manned and unmanned aircraft. The article used the following methods: monographic, expert, participant observation, inductive and deductive, analysis, synthesis and comparison. Research sources were available literature and magazines, press articles, interviews, reports and authors' own experience as well as documents sourced from websites, most of which were written in English.
    Źródło:
    Przegląd Nauk o Obronności; 2019, 4, 7-8; 1-14
    2450-6869
    Pojawia się w:
    Przegląd Nauk o Obronności
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmodernizowane kabiny sterownicze lokomotyw elektrycznych i spalinowych
    Modernized, control cabs of the electric and diesel locomotives
    Autorzy:
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/34582072.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
    Tematy:
    kabina sterownicza
    lokomotywa elektryczna
    lokomotywa spalinowa
    modernizacja
    control cabin
    electric locomotive
    diesel locomotive
    modernization
    Opis:
    W artykule dokonano przeglądu kabin sterowniczych wybranych lokomotyw i stanowisk sterowniczych przed modernizacją, pokazano przebieg prac przy modernizacji kabin lokomotyw z wykorzystaniem modeli 3D kabin lokomotyw przed modernizacją, a po modernizacji pokazano modele 3D zmodernizowanych kabin i nowych stanowisk sterowniczych (konsola, dolna część pulpitu) razem z fotelami oraz zaprezentowano widoki lokomotyw po modernizacji wraz z kabinami i stanowiskami sterowniczymi po modernizacji. Praca dotycząca modernizacji kabin została wykonana w ramach projektu rozwojowego NR 10-0062-10/2011 pt. „Lokomotywy manewrowe z hybrydowym układem napędowym z wykorzystaniem wysokowydajnych zasobników energii” i sfinansowana przez NCBR.
    This article reviews the control cabs of the selected locomotives and the control stands before modernization. The course of works during the modernization of locomotive cabs with using the 3D models of locomotive cabs before modernization is presented. 3D models after modernization of the modernized cabs and the new control stands (console, the lower part of desk) with the chairs are given. The views of locomotives after modernization with their cabs and control stands are also presented. Some works concerning the modernization of the cabs was made as part of the development project No 10-0062-10/2011 titled „Shunting locomotive with hybrid drive system using the high-performance energy containers”.
    Źródło:
    Rail Vehicles/Pojazdy Szynowe; 2014, 2; 29-38
    0138-0370
    2719-9630
    Pojawia się w:
    Rail Vehicles/Pojazdy Szynowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Concepts of managing and increasing the efficiency of using airspace in relation to increasing air traffic
    Autorzy:
    Kozuba, Jarosław
    Krawczyk, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/576335.pdf
    Data publikacji:
    2018-03-20
    Wydawca:
    Akademia Sztuki Wojennej
    Tematy:
    Polish airspace
    AAR
    corridors in airspace
    increasing the effi ciency of use of
    airspace
    air operations
    Opis:
    Polish airspace is available on equal terms to all its users. Due to the increasing air traffic airspace structure and the system of airspace, management should constantly improve, taking into account the provisions of international and national conditions. The article looks at issues in the management of airspace in order to increase the efficiency of the use of Polish airspace while maintaining an appropriate level of air traffic safety during flight operations by military and civilian aircraft.
    Źródło:
    Security and Defence Quarterly; 2018, 18, 1; 45-56
    2300-8741
    2544-994X
    Pojawia się w:
    Security and Defence Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Koncepcja rozwiązań w zakresie BSP oraz wyzwania dla służb ruchu lotniczego związane z potencjalnym zagrożeniem przez bezpilotowe statki powietrzne
    Autorzy:
    Kozuba, Jarosław.
    Krawczyk, Jacek.
    Powiązania:
    Zeszyty Naukowe / Wyższa Szkoła Oficerska Sił Powietrznych 2016, nr 3, s. 135-144
    Data publikacji:
    2016
    Tematy:
    Bezzałogowe statki powietrzne szkolenie
    Bezzałogowe statki powietrzne obsługa i eksploatacja
    Loty bezpieczeństwo
    Opis:
    Rys., tab.
    Bibliogr.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Zachowania dewiacyjne młodzieży w Warszawie w 1993 r. (badania typu self-report)
    Deviant Behavior n Warsaw Youth in 1993
    Autorzy:
    Kossowska, Anna
    Krawczyk, Jacek
    Rzeplińska, Irena
    Powiązania:
    https://bibliotekanauki.pl/articles/699078.pdf
    Data publikacji:
    1995
    Wydawca:
    Polska Akademia Nauk. Instytut Nauk Prawnych PAN
    Tematy:
    zachowania dewiacyjne
    młodzież
    Warszawa
    nieprzystosowanie społeczne
    przestępczość
    badania typu self-report
    deviant behavior
    youth
    Warsaw
    social maladjustment
    delinquency
    self-report study
    Opis:
    1. The findings discussed in the paper have been obtained within an international research project aimed at comparing the extent of self-reported deviant behavior of youth 11 West-European countries (Finland, England, Nord Ireland the Netherland, Germany, Belgium, Switzerland, portugal, Greece, Spain and Italy), the United States and New Zealand. The questionnaire ultimately used in all countries participating in the project resulted from long negotiations and was in fact a compromise. It contained questions about both the respondents’ deviant behavior and their social situation with consideration to variables of importance from the viewpoint of the theory of social control. Deviant behavior was divided into the following six groups: l) behavior manifesting social maladjustment (as.e.g. truancy or stealing rides); 2) destruction of objects (vandalism); 3) appropriation of another person’s property; 4) aggressive behavior; 5) alcohol consumption; and 6) drug taking and selling.  Examined were young people from Warsaw, born in the years 197l‒1978; the sample consisted of 701 persons aged 14‒21 at the time of the survey. At the moment of the interview, 80.5 % of respondents either had a job or went to school.  Most respondents (65.9%) stated they were on good terms with their father. Even a greater proportion of 88.5% were on good terms with their mother. Ten percent of the sample had no contacts whatever with their father, and a much smaller proportion (2.3%) ‒ with their mother.  Apart from 42 persons, respondents stated they had real friends; over a half had one to three such friends. The rest mentioned larger groups as their friends. Forty-seven percent had a girl- or boyfriend; two-thirds would like the relationship to last. Of the examined 363 boys, 84.8% had played truant from school at least once for one day. The proportion tended to grow bigger with respondents’ age. It showed a regular upward trend from 50% among the14-year-olds to 100% among boys of 23. Of the examined 383 girls, played truant, with the proportion reaching its peak value of l00% among the 2l-year-olds, and showing an upward trend from 33.3% among the 14-year-olds to  97.4% among girls of 19. Another widespread phenomenon was stealing rides on city buses, trolley buses, or trams. Those who had stolen a ride at least once constituted 95.9% of the boys and 89.3% of the girls. Stealing rides on trains or intercity buses was much less widespread. It was admitted by 35.8% of the boys and 22% of the girls. Driving a car or motorcycle without a license or a motorbike without a bicycle permit was admitted by 52.6% of the boys and 29.9% of the girls. A further act we inquired about was painting or spraying walls, buses, bus seats and stops, etc. Such acts were admitted by 22.9% of the boys and 12.7% of the girls. Still another group of acts qualified as vandalism includes acts that result in destruction of or damage to property. The largest group of both boyg and girls tend to vandalise school furniture (22.3% of the boys and 13% of the girls), as well as trees, bushes and flowers in parks and squares (18.2 and 10.1% respectively). Asked whether they had ever carried any weapon, such as a knife, club, knuckle-duster, or gas pistol, 43.3% of the boys and 26.6% of the girls answered in the affirmative.             Relatively large were the proportions of boys (25.9%) and girls (10.7%) who had ever participated in brawls or group disturbances in a public place.             A proportion of 7.2% of the boys and 1.8% of the girls admitted having beaten a stranger. Cases of beating a family member were occasional: they were admitted by 1.4% of the boys and 0.6% of the girls. Also a small proportion of 3.3% of the boys and 1.3% of the girls admitted having wounded another person with a knife, club or another weapon. Intentional arson was admitted by 5.5% of the boys and 1.2% of the girls. Offenses against property or acts consisting in appropriation of property without the knowledge or consent of its owner were related frequent in the sample.             Of the 702 young persons, 55.1% had committed at least one of the listed fourteen categories of acts. This proportion is rather big the fact considered that average young people were examined. Of the 14 categories of acts against property consisting in its appropriation, the youth most often admitted shoplifting, purchasing stolen property, breaking and entering, and thefts at school. Questions relating to drugs concerned two points: the taking of drugs and their selling by respondents. The drugs inquired about were divided into two categories, each of them asked about separately: marihuana and hashish (the first category); and home-made poppy straw brew, heroin, cocaine and LSD (the second category). A proportion of 16.5% admitted having ever taken marihuana or hashish. Boys admitted this behawior more often than girls (with proportions of boys and girls balanced in the sample): every fifth boy and every eighth girl had experiences with this category of drugs. A much smaller proportion of 2% admitted having ever taken the second category of drugs. Answers stating that the respondent had ever taken marihuana or hashish were evenly distributed in the sample and tended to become more frequent with age. The declared use of the second category of drugs was very rare and evenly distributed in age groups from 16 to 21. Ten persons,  among them 9 boys, admitted having sold marihuana or hashish. Most were aged 16‒18, that is still went to school. They stated that the police had never learned about their doings. Four persons admitted having sold the second category of drugs. They had sold amphetamine, cocaine, or psychedelic drugs in their neighborhood. None had been caught at the act. Asked, “Have you ever drunk beer, wine, vodka or another alcoholic beverage?”, nearly the entire sample (95.9% of the boys and 94.7% of the girls) answered in the affirmative. Asked about the age of their first contact with alcohol, 3.7% mentioned the age of under ten; 19.8% ‒10‒14; 48.3% ‒ 14‒16; and 17.l% ‒ 17‒21. The proportion of respondents who had happened to get drunk at least once was 56.3%. Asked about drinking during the year preceding the survey, 93.6% said they had drunk in that period; 50.3% admitted having drunk on up to 10 occasions, 18.1%  ‒  on ll‒24 occasions, 10.6% ‒ on 25‒50 occasions, and 20.9% ‒ on over 50 occasions. The last time before the survey, the respondents drank: beer (43.8%), vodka (35.6%), wine (27.6%), and long drinks (10%). A majority of 86.5% drank in the company of others; under 10% had one companion, two-thirds of the rest drank in a group of 2‒10 persons, and the remaining ‒ in a larger company. In the international survey, national samples were examined in four countries (Switzerland, England and Wales, Portugal, and the Netherlands). In Spain, the survey concerned a large national urban sample. Examined in further two countries (Germany and North Ireland) were random samples from specific cities (Mannheim and Belfast respectively). Four other countries decided to examine a random sample of school youth from a specific city (Helsinki; three ltalian cities: Genova, Messina and Siena; Liege). The United States and New Zealand were left out from comparisons. Thus in principle the findings to be compared were not necessarily comparable. Yet it seems advisable to discuss the general trends shown in national surveys. What, therefore, are the similarities and dissimilarities between Poland and Western Europe? As regards the incidence of delinquency, considerable similarities can be noticed between findings of all national surveys but the English one. In surveys of city samples (those of school youth included), significant similarity can be noticed in the extent of delinquent acts “ever committed” by the young of Warsaw, Helsinki, and Athens. As regards the extent of acts committed “during last year”, the findings obtained in Warsaw are highly similar to those for Helsinki. In Athens, instead, the greatest extent of juvenile delinquency of all examined cities was found. A comparison of acts committed “during last year” indicates a similar intensity of offenses against property among the youth of Warsaw, Belfast, and Liege; as compared to Warsaw, a much greater extent of there offences is found in Helsinki and of Swiss youth, and a decidedly smaller one - in the English and Italian sample. Submitting offenses against property to a closer analysis, one notices that the Polish youth relatively more often commit acts consisting in “breaking and entering” as compared c.g. to young people in England, the Netherlands, or Finland: this type of act was committed at least once by 20.7% of the Polish sample, by 14.9% of the youth of Helsinki, by 3.4% of the English youth, and by 6.9% of the young Dutch. The extent of acts related to drugs (taking and trafficking), among Warsaw youth is similar to that among the young of Portugal and Helsinki, somewhat lower than among the Dutch and Spanish youth, much lower than among the English, Swiss, and Belfast young people, but higher than among the youth of Mannheim, Liege, Athens and the three Italian cities.
    Źródło:
    Archiwum Kryminologii; 1995, XXI; 81-103
    0066-6890
    2719-4280
    Pojawia się w:
    Archiwum Kryminologii
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the impact of forging and trimming tools wear on the dimension-shape precision of forgings obtained in the process of manufacturing components for the automotive industry
    Analiza wpływu zużycia narzędzi do kucia i okrawania na dokładność wymiarowo-kształtową odkuwek uzyskiwanych w procesie wytwarzania elementów dla przemysłu motoryzacyjnego
    Autorzy:
    Hawryluk, Marek
    Kondracki, Piotr
    Krawczyk, Jakub
    Rychlik, Marcin
    Ziemba, Jacek
    Powiązania:
    https://bibliotekanauki.pl/articles/1365240.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    trimming process
    numerical simulation
    geometric quality of forgings
    wear of tools
    process okrawania
    symulacje numeryczne
    jakość geometryczna odkuwek
    zużycie narzędzi
    Opis:
    The study presents the results of an analysis of the manufacturing process of a yoke-type forging for automotive industry with the use of numerical modelling and 3D scanning techniques, taking into account the gradual wear of both forging tools and trimming to determine the mutual impact of their operation on the dimensional accuracy of the forgings. The performed analysis included the 4 variants which are that have the most common place in the industrial process that is, for a combination of new and partly worn out die inserts (used during hot forging) and new and partly used cutting tools used for cold trimming. The first stage involved modelling of a hot die forging process. Next, the obtained results were implemented into second modelling stage, which involved a simulation of a cold trimming process of a flash, with the use of the normalized Cockcroft-Latham fracture criterion, with the consideration of eliminating the removed elements, for which the cracking value has been exceeded. The obtained results was verified by means of a case study under industrial conditions for the least favourable operating conditions of both types of tools and their impact on the dimension-shape precision of the forgings. These results allowed for a more complete analysis of the trimming process for a variety of operating conditions and the confirmation of the correctness of carried out numerical modelling, and thus the possibility of its use in combination with scanning technique to computer-aided manufacturing processes. The proposed solution allows the selection of optimum conditions for implementation of the processes of forging and trimming because of their use to provide the required net shape forgings.
    W pracy przedstawiono wyniki analizy procesu wytwarzania odkuwki typu rozwidlonego dla przemysłu motoryzacyjnego z wykorzystaniem modelowania numerycznego oraz technik skanowania 3D przy uwzględnieniu sukcesywnego zużywania się zarówno narzędzi do kucia, jak i do okrawania w celu określenia wzajemnego wpływu ich eksploatacji na dokładność wymiarową odkuwek. Przeprowadzona analiza obejmowała 4 warianty najczęściej występujące w procesie przemysłowym, czyli dla kombinacji nowych i częściowo wyeksploatowanych wkładek matrycowych (stosowanych podczas kucia na gorąco) oraz nowych i częściowo zużytych narzędzi okrojczych wykorzystywanych do okrawania na zimno. W pierwszym etapie zamodelowano proces kucia matrycowego na gorąco. Następnie uzyskane wyniki zaimplementowano do drugiego etapu modelowania, w którym zasymulowano proces okrawania na zimno wypływki przy zastosowaniu znormalizowanego kryterium pękania Cockcrofta-Lathama z uwzględnieniem eliminacji elementów, dla których została przekroczona wartość pękania. Uzyskane wyniki zostały zweryfikowane za pomocą studium przypadku w warunkach przemysłowych dla najmniej korzystnych warunków eksploatacji obu rodzajów narzędzi oraz ich wpływu na dokładność wymiarowo-kształtową odkuwki. Uzyskane wyniki pozwoliły na pełniejszą analizę procesu okrawania dla różnych warunków eksploatacyjnych oraz potwierdzenie poprawności przeprowadzonego modelowania numerycznego, a tym samym możliwości jego wykorzystania do komputerowego wspomagania procesów wytwarzania. Zaproponowane rozwiązanie pozwala na wybór optymalnych warunków realizacji procesów kucia i okrawania ze względu na ich eksploatację w celu zapewnienia wymaganej dokładności wymiarowo-kształtowej odkuwek.
    Źródło:
    Eksploatacja i Niezawodność; 2019, 21, 3; 476-484
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Methods of enlarging material to the concentration table
    Autorzy:
    Feliks, Jacek
    Krawczyk, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/2064376.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    concentration table
    coefficient of friction
    enrichment
    tabela koncentracji
    współczynnik tarcia
    wzbogacanie
    Opis:
    Concentration tables are one of the oldest oscillatory enrichments with over 100 years of tradition. On this type of distribution tables are made according to material mass in many recurring cycles induced by appropriate drives. So-called wet tables are the devices most often used for coal enrichment in Polish mines because this process generates very high costs, high water consumption and pollution of the environment, as well as the need for, among others, water and mud management is increasingly being replaced mainly in areas poor in water by the modern model of the air concentration table - FGX produced in China. The process of enrichment on this type of table itself runs in a manner comparable to the method of wet enrichment with the difference that the FGX is distributed on a perforated plate, in this case we deal with air pollution. Department of Machinery Engineering and Transport's attempts to use the differences in coefficients of friction in over-resonance screens have shown that it is possible effective separation of grains with different coefficients of friction. The article presents a theoretical analysis and presents the results of performed dry enrichment trials using different coefficients of friction. The summary presents the advantages of using the enrichment method using the differences in friction coefficients and test results.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 59--68
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling the movement of broadcast on the concentration table
    Autorzy:
    Feliks, Jacek
    Krawczyk, Magdalena
    Powiązania:
    https://bibliotekanauki.pl/articles/2064429.pdf
    Data publikacji:
    2019
    Wydawca:
    STE GROUP
    Tematy:
    concentration table
    coefficient of friction
    enrichment
    tabela koncentracji
    współczynnik tarcia
    wzbogacanie
    Opis:
    The article attempts to analyze the work of the concentration table, on which the distribution of the material under investigation takes place. The efficiency of separation or otherwise enrichment depends on the drive that puts the concentration table plate into an asymmetrical reciprocating movement. The most frequently used solutions are concentration tables, on which the distribution of enriched material takes place in an aqueous medium commonly called wet enrichment. The AGH University of Science and Technology conducted simulation tests of material enrichment on a concentration table using the differences in friction coefficient commonly referred to as dry enrichment, i.e. without an additional medium. The article presents the effects of simulations that have been carried out for reference materials characterized by different friction coefficients and densities. The summary presents the analysis of obtained effects of computer simulations of material movement with different coefficients of friction. The simulations were carried out for variables: the frequency of vibrations of the concentration table and the angle of inclination of the table of the concentration table. It has been shown that it is possible to enrich the material by changing the above-mentioned operating parameters of the device.
    Źródło:
    New Trends in Production Engineering; 2019, 2, 1; 304--311
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nowe możliwości zastosowania kompozytowych wstawek hamulcowych fr 510 typu ll w wagonach towarowych
    New possibilities of application of composite brake shoes fr510 type ll in freight wagons
    Autorzy:
    Bułhak, Jacek
    Wasilewski, Piotr
    Krawczyk, Natasza
    Powiązania:
    https://bibliotekanauki.pl/articles/34112010.pdf
    Data publikacji:
    2016
    Wydawca:
    Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
    Tematy:
    kompozytowa wstawka hamulcowa
    wagon towarowy
    hałas
    redukcja
    interoperacyjność kolei
    przepisy
    Unia Europejska
    composite brake shoe
    boxcar
    noise
    reduction
    rail interoperability
    regulations
    European Union
    Opis:
    Artykuł dotyka kwestii redukcji hałasu toczenia emitowanego przez wagon towarowy poprzez zastosowanie kompozytowej wstawki hamulcowej. Przedstawiono możliwości zastosowania kompozytowej wstawki hamulcowej typu LL, nie posiadającej homologacji UIC, w wagonach towarowych poruszających się w transeuropejskim systemie kolei. Publikacja zawiera analizę obecnie obowiązujących w Unii Europejskiej przepisów, regulujących interoperacyjność kolei w zakresie układu hamulcowego oraz przedstawia sposób postępowania umożliwiający zastąpienie wstawek żeliwnych kompozytowymi w istniejącym taborze. W artykule zaprezentowano ponadto wyniki prób stanowiskowych i eksploatacyjnych kompozytowej wstawki hamulcowej FR510 przeprowadzone w Polsce i w Maroku oraz porównanie właściwości tego materiału z wynikami wstawek typu LL, które uzyskały homologację UIC w projekcie EuropeTrain.
    The article presents the possibility to apply type LL composite brake shoes, which are not UIC-approved, in freight wagons being in service in trans-European rail system. The publication contains an analysis of the existing European Union law governing the interoperability of the rail system in the scope of the brake system and shows a feasible procedure that allows cast-iron brake shoes to be replaced with composite brake shoes in the existing rolling stock. The article presents the results of bench and field tests of the FR510 composite brake shoe conducted in Poland and Morocco and a comparison of the properties of this material to the results of LL-blocks that were approved in UIC project EuropeTrain.
    Źródło:
    Rail Vehicles/Pojazdy Szynowe; 2016, Nr 2; 49-59
    0138-0370
    2719-9630
    Pojawia się w:
    Rail Vehicles/Pojazdy Szynowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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