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    Wyświetlanie 1-11 z 11
    Tytuł:
    Experimental and numerical investigations and optimisation of grain-oriented silicon steel mechanical cutting process
    Autorzy:
    Patyk, Radosław
    Bohdal, Łukasz
    Gontarz, Szymon
    Powiązania:
    https://bibliotekanauki.pl/articles/2204588.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
    Tematy:
    magnetic materials
    shear slitting
    sheared edge
    magnetic properties
    Opis:
    The process of mechanical cutting of magnetic materials has many advantages in the form of high efficiency with reduced process costs in relation to other cutting technologies; no thermal stresses in the material, which significantly deteriorate the magnetic properties; or the possibility of shaping materials taking into account long cutting lines. In industrial practice, it is very difficult to ensure appropriate conditions for the cutting process and its proper control. Currently, there are no data on the selection of technological parameters of the mechanical shear slitting process of grain-oriented silicon steel in terms of the obtained cutting surface quality and the obtained magnetic properties of the workpiece. The article presents the possibilities of forecasting the characteristic features of the cut edge and selected magnetic properties of grain-oriented silicon steel. For this purpose, proprietary numerical models using FEA (Finite Element Analysis) were used. Then, experimental studies were carried out, and the optimisation task was developed. The developed results enable the correct selection of technological parameters of the process, ensuring the appropriate quality of the cut edge of steel and minimal interference with the magnetic properties.
    Źródło:
    Acta Mechanica et Automatica; 2022, 16, 3; 292--300
    1898-4088
    2300-5319
    Pojawia się w:
    Acta Mechanica et Automatica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Percutaneous vena cava superior angioplasty and stenting as an effective method of treatment in vena cava superior syndrome in the course of lung cancer
    Autorzy:
    Darocha, Szymon
    Szmit, Sebastian
    Pietura, Radosław
    Kurzyna, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/1065677.pdf
    Data publikacji:
    2014
    Wydawca:
    Medical Education
    Tematy:
    lung cancer
    vena cava superior stenting
    vena cava superior syndrome
    Opis:
    Vena cava superior syndrome (VCSS) is a sudden life-threatening condition encountered in patients with neoplasms. The prognosis depends on histopathological diagnosis, severity of clinical symptoms and administered treatment. Depending on the type of neoplasm, the treatment of choice may be radiotherapy or chemotherapy. In patients with rapidly increasing clinical symptoms the justified management is percutaneous balloon angioplasty of the superior vena cava with the placement of stents.
    Źródło:
    OncoReview; 2014, 4, 3; A108-112
    2450-6125
    Pojawia się w:
    OncoReview
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bogie design of 227M type rail vehicle
    Autorzy:
    Miklasz, Radosław
    Dawid, Szymon
    Wojtukiewicz, Paweł
    Grzegórski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/32101685.pdf
    Data publikacji:
    2022-05-24
    Wydawca:
    Sieć Badawcza Łukasiewicz - Poznański Instytut Technologiczny
    Tematy:
    interoperability
    bogie
    dual drive rail vehicle
    link arm
    running gear system
    Opis:
    The article presents the running parameters and construction of the 41MN and 46MN hybrid traction units (HZT). Design solutions were presented and described, attention was paid to the functions fulfilled by individual systems of rolling and driving bogies.The article was created as part of an ongoing project as part of Program Badań Stosowanych 3 Umowa Nr PBS3/B6/26/2015 „Lekki autobus szynowy do ruchu regionalnego”.
    Źródło:
    Rail Vehicles/Pojazdy Szynowe; 2022, 1-2; 40-48
    0138-0370
    2719-9630
    Pojawia się w:
    Rail Vehicles/Pojazdy Szynowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Surface Topography of Ti6Al4V Alloy after the Finish Turning Process under Ecological Conditions
    Autorzy:
    Maruda, Radosław W.
    Leksycki, Kamil
    Wojciechowski, Szymon
    Feldshtein, Eugene
    Łukaszewicz, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2201929.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    dry machining
    MQL
    MQL method
    finish turning
    surface topography
    Ti6Al4V titanium alloy
    Opis:
    This paper describes findings in the surface topography of Ti6Al4V alloy after finish turning process under dry and MQL (minimum quantity lubrication) machining. The research was fulfilled in the range of variable feeds per revolution of 0.005-0.25 mm/rev and cutting speeds of 40-100 m/min using the depth of cut of 0.25 mm that fits finish processing conditions. The test plan was developed on the way to use the Parameter Space Investigation (PSI) method. The topography features were measured by a Sensofar S Neox optical profilometer using the Imaging Confocal Microscopy technique. Ra parameters and surface roughness profiles as well as 2D images and contour maps were analyzed. Under the studied machining conditions, lower Ra roughness parameters are obtained in the feed rate of 0.005-0.1 mm/rev and cutting speeds of 40-60 m/min. In comparison with dry machining, up to 17% reduction in Ra parameter values was obtained using the MQL method and vc = 70 m/min and f = 0.127 mm/rev as well as vc = 47.5 m/min and f = 0.22 mm/rev. Depending on the machining conditions, peaks and pits as well as feed marks typical for the turning process are observed on the machined surfaces.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 2; 63--70
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Abdominal Ultrasonography in Detecting and Surgical Treatment of Pancreatic Carcinoma
    Autorzy:
    Kulig, Piotr
    Pach, Radosław
    Pietruszka, Szymon
    Banaś, Bartłomiej
    Sierżęga, Marek
    Kołodziejczyk, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/1396690.pdf
    Data publikacji:
    2012-06-01
    Wydawca:
    Index Copernicus International
    Tematy:
    pancreatic cancer
    percutaneous abdominal ultrasonography
    diagnostic accuracy
    Opis:
    The aim of the study was to asses the clinical value of percutaneous abdominal ultrasonography in diagnosis, staging and surgical treatment of patients with pancreatic carcinoma.Material and methods. Prospective clinical trial on diagnostic accuracy of percutaneous abdominal ultrasonography was conducted in 409 consecutive patients with pancreatic cancer which were operated on at the I Dept. of General Surgery in Cracow between 2000 and 2010.Results. Diagnostic accuracy of percutaneous abdominal ultrasonography in pancreatic cancer was 91,1%. The accuracy in detecting different stages of local advancement according to TNM classification was assessed respectively 92.3%-T1, 91.3%-T2, 89.4%-T3, 92.1%-T4, a whole T1-T4 on 91.3%. Diagnostic accuracy of percutaneous abdominal ultrasonography in diagnosis of metastasis to lymph nodes, vascular infiltration, and resectability was respectively 80.7%, 86%, 91.4%.Conclusions. Percutaneous abdominal ultrasonography has high diagnostic accuracy in diagnosis, staging and predicting surgical treatment of patients with pancreatic carcinoma.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 6; 285-292
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time to treatment of prostate cancer patients
    Autorzy:
    Rucińska, Monika
    Osowiecka, Karolina
    Gałka, Szymon
    Środa, Radosław
    Wojciechowski, Piotr
    Sugajska, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/1035802.pdf
    Data publikacji:
    2018
    Wydawca:
    Medical Education
    Tematy:
    prostate cancer
    waiting for treatment
    Opis:
    Prostate cancer is one of the most common cancers in men. The incidence of prostate cancer increases systematically. The correlation between waiting time for oncological treatment and survival prognosis in prostate cancer is not clearly determined. The aim of the study was to estimate the waiting time from suspicion until prostate cancer diagnosis and treatment in Warmia and Mazury Voivodeship. Ninety-six consecutive prostate cancer patients treated with radical radiotherapy between November 2016 and June 2017 in the Department of Radiation Oncology of the Hospital of the Ministry of Internal Affairs with Warmia and Mazury Oncology Center in Olsztyn were included in the analysis. A questionnaire prepared especially for this study, and individual interviews with patients were used in the study. The obtained data was supplemented with medical records and hospital databases. In the case of twenty-nine men, the PSA concentration was measured due to urinary disorders, and the median time from symptoms until the first PSA test in that group was 168 days. The median time from PSA concentration > 4 ng/ml to biopsy of prostate cancer and start of treatment for all patients was 62 and 156 days, respectively. Hormone therapy was administered the quickest. A positive correlation was observed between the waiting time from histopathological confirmation of prostate cancer until treatment, and the distance from one’s place of residence to the oncological center (p < 0.05).
    Źródło:
    OncoReview; 2018, 8, 3; 86-93
    2450-6125
    Pojawia się w:
    OncoReview
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Determinants of Identity Formation during the Transition from Adolescence into Adulthood
    Autorzy:
    Brzezińska, Anna Izabela
    Czub, Tomasz
    Hejmanowski, Szymon
    Rękosiewicz, Małgorzata
    Kaczan, Radosław
    Piotrowski, Konrad
    Powiązania:
    https://bibliotekanauki.pl/articles/52592459.pdf
    Data publikacji:
    2012-10-31
    Wydawca:
    Wydawnictwo Adam Marszałek
    Tematy:
    adolescence
    emerging adulthood
    early adulthood
    sense of adulthood
    adult social roles
    dimensions of identity
    identity status
    developmental trajectories
    shame proneness
    sense of punctuality of life events
    social participation type
    shame regulation
    Opis:
    The process of identity formation during the transition from adolescence into adulthood and its determinants are currently a central issue in the social sciences. On the one hand, the huge variety of possibilities presents the opportunity to expand the fields of exploration and to tailor commitments to individual aspirations and preferences. On the other hand, increasing instability and Bauman’s liquidity of the social environment of development may create threats that impede the making of decisions, engaging in their realization, and identifying with the choices made. James Marcia’s two-stage model of identity formation no longer adequately describes and accounts for paths of identity development. The dynamic dual-cycle model of identity formation developed by Koen Luyckx and collaborators is much more accurate. Although identity continues to develop throughout course of life, childhood, and adolescence in particular, seems to be pivotal from the point of view of which developmental trajectory the individual is on at the moment of his/her entry into adulthood. From this point of view, the factors which we regard as crucial for identity formation are shame proneness and shame regulation strategies on the one hand, and the system of personal beliefs about one’s life and related key social experiences which define the quality of social participation of adolescents on the other hand.
    Źródło:
    Kultura i Edukacja; 2012, 5(91); 5-31
    1230-266X
    Pojawia się w:
    Kultura i Edukacja
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining lower bound on number of vehicle blocks in multi-depot vehicle scheduling problem with mixed fleet covering electric buses
    Autorzy:
    Duda, Jerzy
    Fierek, Szymon
    Karkula, Marek
    Kisielewski, Piotr
    Puka, Radosław
    Redmer, Adam
    Skalna, Iwona
    Powiązania:
    https://bibliotekanauki.pl/articles/27311780.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    public transport
    organization of public transport
    vehicle scheduling
    electric buses
    mixed fleet
    transport publiczny
    organizacja transportu publicznego
    planowanie pojazdów
    autobusy elektryczne
    Opis:
    Scheduling buses in public transport systems consists in assigning trips to vehicle blocks. To minimize the cost of fuel and environmental impact of public transport, the number of vehicle blocks used should be as small as possible, but sufficient to cover all trips in a timetable. However, when solving real life transportation problems, it is difficult to decide whether the number of vehicle blocks obtained from an algorithm is minimal, unless the actual minimal number is already known, which is rare, or the theoretical lower bound on the number of vehicles has been determined. The lower bound on the number of vehicle blocks is even more important and useful since it can be used both as a parameter that controls the optimization process and as the minimum expected value of the respective optimization criterion. Therefore, methods for determining the lower bound in transportation optimization problems have been studied for decades. However, the existing methods for determining the lower bound on the number of vehicle blocks are very limited and do not take multiple depots or heterogeneous fleet of vehicles into account. In this research, we propose a new practical and effective method to assess the lower bound on the number of vehicle blocks in the Multi-Depot Vehicle Scheduling Problem (MDVSP) with a mixed fleet covering electric vehicles (MDVSP-EV). The considered MDVSP-EV reflects a problem of public transport planning encountered in medium-sized cities. The experimental results obtained for a real public transport system show the great potential of the proposed method in determining the fairly strong lower bound on the number of vehicle blocks. The method can generate an estimated distribution of the number of blocks during the day, which may be helpful, for example, in planning duties and crew scheduling. An important advantage of the proposed method is its low calculation time, which is very important when solving real life transportation problems.
    Źródło:
    Archives of Transport; 2023, 65, 1; 27--38
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Multi-objective optimization model for a multi-depot mixed fleet electric vehicle scheduling problem with real-world constraints
    Autorzy:
    Duda, Jerzy
    Karkula, Marek
    Puka, Radosław
    Skalna, Iwona
    Fierek, Szymon
    Redmer, Adam
    Kisielewski, Piotr
    Powiązania:
    https://bibliotekanauki.pl/articles/2203871.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    public transport
    electric bus
    scheduling
    MILP
    transport publiczny
    autobus elektryczny
    planowanie
    Opis:
    This paper presents the problem of public transport planning in terms of the optimal use of the available fleet of vehicles and reductions in operational costs and environmental impact. The research takes into account the large fleet of vehicles of various types that are typically found in large cities, including the increasingly widely used electric buses, many depots, and numerous limitations of urban public transport. The mathematical multi-criteria mathematical model formulated in this work considers many important criteria, including technical, economic, and environmental criteria. The preliminary results of the Mixed Integer Linear Programming solver for the proposed model on both theoretical data and real data from urban public transport show the possibility of the practical application of this solver to the transport problems of medium-sized cities with up to two depots, a heterogeneous fleet of vehicles, and up to about 1500 daily timetable trips. Further research directions have been formulated with regard to larger transport systems and new dedicated heuristic algorithms.
    Źródło:
    Transport Problems; 2022, 17, 4; 137--149
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Surface Topography During Turning of AISI 1045 Steel Considering the Type of Cutting Edge Coating
    Autorzy:
    Szczotkarz, Natalia
    Maruda, Radosław W.
    Dębowski, Daniel
    Leksycki, Kamil
    Wojciechowski, Szymon
    Khanna, Navneet
    Królczyk, Grzegorz M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2023489.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    turning
    surface topography
    dry machining
    titanium coating
    AISI 1045 steel
    toczenie
    topografia powierzchni
    obróbka na sucho
    powłoka tytanowa
    stal AISI 1045
    Opis:
    The paper presents evaluation of the surface topography obtained after turning of AISI 1045 steel with the use of cemented carbide tools diversified in terms of applied titanium-based coatings. During the research, three types of coatings deposited with the PVD method on a P25 sintered carbide insert were compared: nitride-titanium TiN, nitride-aluminum-titanium TiAlN and carbon-titanium TiC in a wide range of variable cutting speeds 125 - 325 m/min and variable feeds 0.05 - 0.25 mm/rev. The quality of the machined surface was assessed on the Sensofar S neox System optical profile meter using the confocal method. The paper presents the results of 3D parameters, contour maps, isometric views and material ratio curves. The surface topography analysis showed that for the TiAlN coated insert, lower surface roughness parameters were observed in the range of lower cutting speeds and higher feeds, while for higher cutting speeds, lower values of the selected 3D parameters were found for the insert with TiC coating. For the insert with TiC coating, the most even distribution of the valleys and ridges of the machined surface roughness was also observed. The research results determined the range of cutting parameters that allow the selection of the appropriate type of titanium-based coating when machining AISI 1045 steel.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 4; 253-266
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Percutaneous retrieval of a fractured portacath fragment in two patients undergoing long-term chemotherapy
    Autorzy:
    Norwa, Justyna
    Darocha, Szymon
    Dobosiewicz, Anna
    Koteja, Andrzej
    Pietrasik, Arkadiusz
    Pietura, Radosław
    Torbicki, Adam
    Szmit, Sebastian
    Kurzyna, Marcin
    Powiązania:
    https://bibliotekanauki.pl/articles/1064899.pdf
    Data publikacji:
    2016
    Wydawca:
    Medical Education
    Tematy:
    cancer
    central venous port
    chemotherapy
    endovascular removal
    Opis:
    The paper discusses two clinical cases of cancer patients undergoing chemotherapy, in whom fractured and displaced tips of portacath catheters were revealed based on plain chest imaging. In the first case, the portacath fragment migrated to the left pulmonary artery, with the missing catheter tip revealed during the procedure of port removal due to its occlusion, with no other prior clinical symptoms. In the second case, the catheter broke off at the level of its entry into the subclavian vein, and migrated into the right cardiac ventricle, which was accompanied by mild pain and oedema in the subclavicular region. Both patients underwent successful procedures of percutaneous foreign body retrieval with the use of endovascular snares. The procedures were performed via femoral vein access, with no complications.
    Źródło:
    OncoReview; 2016, 6, 2; A57-61
    2450-6125
    Pojawia się w:
    OncoReview
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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