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    Wyświetlanie 1-11 z 11
    Tytuł:
    Deterministic versus stochastic modelling of unsaturated flow in a sandy field soil based on dual tracer breakthrough data
    Autorzy:
    Nützmann, Gunnar
    Maciejewski, Stanisław
    Gorczewska-Langner, Wioletta
    Powiązania:
    https://bibliotekanauki.pl/articles/2201207.pdf
    Data publikacji:
    2022
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    unsaturated flow
    tracer transport
    breakthrough curve
    deterministic modelling
    stochastic modelling
    Opis:
    The 216 km2 Neuenhagen Millcreeck catchment can be characterized as a drought-sensitive landscape in NE Germany. It is therefore of fundamental human interest to understand how water that fell as precipitation moves through the unsaturated soils and recharges groundwater. Additionally, a better knowledge of nutrient transport from soil to groundwater is important, especially in landscapes with light sandy soils. For a better understanding of these processes a dual tracer field experiment with bromide (Br–) and deuterium (D2O) was carried out some years ago. The aim of the present study is to use the results of this experiment to model tracer transport in the unsaturated zone via two different concepts, the classical deterministic advection-dispersion equation and a new stochastic approach. The advantage of the stochastic modelling method proposed here for field-scale tracer application is to produce reliable information about expected total solute fluxes from the unsaturated zone to groundwater and about mean transit times. Moreover, this allows one to evaluate the mass of solute in the soil profile and to determine the range of water velocity fluctuations. Field experiments should be concentrated on estimation of fluctuation of water flow velocity to make stochastic models more accurate. To summarize, this work contributes to new modelling methods for the simulation of water and solute transport in unsaturated sandy soils which are heavily affected by droughts and irregular hydrological processes in the subsurface.
    Źródło:
    Geological Quarterly; 2022, 66, 4; art. 66, no. 37
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Evaluation of the Efficacy of Microvascular Breast Reconstruction Techniques
    Autorzy:
    Dobrut, Mirosław
    Maciejewski, Adam
    Półtorak, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1396030.pdf
    Data publikacji:
    2013-01-01
    Wydawca:
    Index Copernicus International
    Tematy:
    breast reconstruction surgery
    Opis:
    The aim of the studywas to evaluate the efficacy of different microvascular techniques in breast reconstruction with the analysis of postoperative complications. The additional goal of the study is to analyze the quality of life of patients after microvascular breast reconstruction in comparison to the control group of patients who underwent only mastectomy without any reconstructive procedures. Also the algorithm of breast reconstruction is presented as the result of own experiences. Material and methods.Clinical material contain 2 groups of patients - women after surgical treatment in Department of Oncological and Reconstructive Surgery, Cancer Center in Gliwice in the year 2004-2009 where in 53 cases immediate and in 26 delayed breast microvascular reconstruction were performed. In all cases the diagnosis of cancer was proved by histopathological biopsy before the treatment. The type of radical resection (mastectomy) depended on histopathological type of cancer and its localization. The reconstruction - immediate vs delayed was carefully planned together with oncological treatment of the cases. Everywhere this plan was established based on carefully examinations of inferior epigastric vessels and theirs perforators. The choice between immediate and delayed microvascular reconstruction was based on prognosis and predictive factors. The QOL was analyzed due to own questionnaire when functional, aesthetics and social effects were evaluated. ResultsFree flap survival rate for all types of free flap was 95%. In cases where classic TRAM was used the rate was 85%, in cases where muscle sparring TRAM was chosen the survival rate was 100% and in remaining cases of DIEP reconstructions the rate was 89%. Generally the complications after microvascular reconstruction occurred in 13 cases (16%). In 9 cases the problems with flaps perfusion were notified. Total flap necrosis was observed in 2 TRAM and in 2 DIEP cases. In all those cases salvage surgery was administered in which the microanastomoses were explored and repaired. In 5 cases the cause of the complications was venous thrombosis, in 2 cases the vascular pedicle was kinked, and in remaining 1 the arterial thrombosis was found. The second type of complication was fat necrosis (<25% of flap volume) which was observed in 5 cases between 1 and 4 months after surgery, and it request minor plastic surgery. Donor site complications were noted in 4 cases. In two of those hernia in cicatrices was diagnosed (both were classic TRAM’s), in remaining 2 in which also fully muscle TRAM was classic the weakness of abdominal wall was observed. In group were msTRAM and DIEP were used no donor site complications occurred.
    Źródło:
    Polish Journal of Surgery; 2013, 85, 1; 6-11
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sliding of spherical ball on solid lubricating coating combined with wear process
    Zużycie powłoki samosmarującej podczas testu poślizgu kuli po tarczy
    Autorzy:
    Białas, Marcin
    Maciejewski, Jan
    Kucharski, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1819238.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    zużycie
    modelowanie elementów skończonych
    powłoki samosmarujące
    powłoka cienka
    poślizg
    kula-tarcza
    wear
    finite element modelling
    lubricating coating
    thin film
    sliding
    ball-on-disc
    Opis:
    In present paper we show results of ball-on-disk wear experiment of MoS2 film deposited on Ti6Al4V substrate. The ball material is aluminium oxide. The tests are performed for different surrounding temperature conditions: 20°C, 200°C and 350°C. It is shown that depth of the wear groove increases with increasing surrounding temperature. A finite element modelling approach is next developed to mimic the experimental observations of ball-on-disk wear process. It is based on the assumption of steady state condition developed during short time scale at contact region. The steady state results can next be applied to long time scale in which wear process is numerically simulated. Model results are compared with experimentally obtained wear groove and show satisfactory agreement.
    Artykuł prezentuje wyniki testu zużycia powłoki samosmarującej MoS2 nałożonej na podłoże wykonane z materiału Ti6AI4V. Powłoka obciążona jest kulką szafirową w ruchu rotacyjnym. Badania wykonano w trzech różnych temperaturach otoczenia: 20°C, 200°C oraz 350°C. Wykazano, że głębokość rowka zużyciowego wzrasta wraz ze wzrostem temperatury otoczenia. Zaproponowano model metody elementów skończonych za pomocą którego zasymulowany został proces zużycia warstwy. Punktem wyjścia dla tej części pracy było założenie stanu ustalonego, powstającego w obszarze kontaktu pomiędzy kulą a warstwą. Warunki odpowiadające temu stanowi przyjęto do matematycznego opisu procesu zużycia z wykorzystaniem równań Archarda. Na zakończenie eksperymentalny profil zużycia porównany został z wynikami otrzymanymi metodą elementów skończonych.
    Źródło:
    Welding Technology Review; 2021, 93, 1; 39--50
    0033-2364
    2449-7959
    Pojawia się w:
    Welding Technology Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Outcomes and Treatment Safety of Patients with Metastatic Colorectal Cancer to the Liver with Estimation of Prognostic Factors
    Autorzy:
    Zeman, Marcin
    Maciejewski, Adam
    Półtorak, Stanisław
    Kryj, Mariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1396271.pdf
    Data publikacji:
    2013-06-01
    Wydawca:
    Index Copernicus International
    Tematy:
    colorectal cancer liver metastases
    liver resection
    neutrophil to lymphocyte ratio
    fibrinogen
    Opis:
    Liver resection is essential part of colorectal cancer liver metastases (CLM) treatment. Mean 5-year overall survival after resection achieves 30-45%. There are many factors influencing long-term outcomes, and among them the inflammatory response to tumor plays an important role. The aim of the study was evaluation of outcomes and treatment safety of patients with metastatic colorectal cancer to the liver with estimation of prognostic factors. Material and methods. 130 consecutive patients (70 men and 60 women) operated in MSC Institute and Cancer Center in Gliwice from 2001 to 2009 due to colorectal liver metastases were analysed. Age of the patients ranged from 33 to 82 years (median 60 years). 96 (74%) patients underwent potentially radical resection, and in remaining 34 (26%) was performed radiofrequency ablation (RFA) alone or combined with the resection. In the resection group 37 right hepatectomies, 11 left hepatectomies, 28 segmentectomies and 20 metastasectomies were performed. Disease-free survival (DFS) and overall survival (OS) were statistically analysed using the Kaplan-Meier method. Factors determining DFS and OS were analysed using Cox regression model. Results. In the resection group the 3- and 5-years OS was 64,5% and 46,6% respectively, and the 3- and 5-years DFS was 32% and 30,5% respectively. In the RFA group the 3- and 5-years OS was 33% and 9,5%. Statistically significant prognostic factors in the resection group in uni- and multivariate analysis were: grade and nodal involvement of the primary tumor, diameter of metastatic focus, positive and narrow (<1 mm) resection margins, preoperative fibrinogen level, preoperative neutrophil to lymphocyte ratio and leukocyte amount of the peripheral blood. The perioperative mortality rate was 3%. Conclusions. Liver resection due to colorectal liver metastases is a safe and effective method resulting in high survival rates. We confirmed some generally accepted prognostic factors influencing longterm outcomes and shown the impact of inflammatory response. We also confirmed the hypothesis that preoperative plasma fibrinogen level influences outcomes after liver resection due to CLM.
    Źródło:
    Polish Journal of Surgery; 2013, 85, 6; 333-339
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The use of anterolateral thigh flap (ALTF) for functional tongue reconstruction with postoperative quality of live evaluati
    Autorzy:
    Krakowczyk, Łukasz
    Maciejewski, Adam
    Szymczyk, Cezary
    Wierzgoń, Janusz
    Półtorak, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1394335.pdf
    Data publikacji:
    2015
    Wydawca:
    Index Copernicus International
    Tematy:
    free flap
    reconstructive surgery
    anterolateral thigh flap
    Opis:
    The use of microsurgery for oral reconstruction of cancer patients, has become standard treatment in restoring oral function. The free anterolateral thigh flap is one of the most preferred options in reconstruction after total, subtotal or hemiresection of the tonque due to squamous cell cancer. The aim of the study was to present the reconstructive method using anterolateral thigh free flap with evaluation of quality of live. Material and methods. Clinical material includes 46 consecutive patients with tongue cancer, who underwent complex surgical treatment between 2009 and 2011. There were 36 males and 10 females and the M: F ratio was 3.6: 1. All of them were reconstructed using the anterolateral thigh free flap. The quality of life was evaluated 6 months after completing the treatment, based on postoperative functional and aesthetic status. Results. The overall flap survival rate was 96%. Surgical complications were observed in 8 patients (17%). Donor site was closed primarly in 42 cases and in remaining 4 skin graft was required. In all 46 cases understandable speech and return to unrestricted diet mastication and swallowing were achieved. The mean follow-up period after treatment was 32 months. Analysis of aesthetic effects evaluated in 23 cases and shows generally very good results. According to average transformed scores the QOL can be characterized as excellent for >90, very good for 76-90, good for 51-75, moderate for 25-50 and bad for <25 points. Conclusions. Anterolateral thigh flap, with its versatility in design, long pedicle with a suitable vessel diameter, low donor site morbidity, and very good aesthetic effects, could be the ideal flap for functional tongue reconstruction.
    Źródło:
    Polish Journal of Surgery; 2015, 87, 8; 384-388
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of a Pedunculated, Extended Latissimus Dorsi Flap in Primary and Secondary Breast Reconstruction Procedures - Case Report
    Autorzy:
    Maciejewski, Adam
    Ulczok, Rafał
    Dobrut, Mirosław
    Szumniak, Ryszard
    Półtorak, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1396681.pdf
    Data publikacji:
    2012-07-01
    Wydawca:
    Index Copernicus International
    Tematy:
    breast reconstruction surgery
    LD flap
    Opis:
    The extended latissimus dorsi flap (LD) is used in breast reconstruction since the 70's. LD flap is often used in corrective surgery in cases of unsatisfactory cosmetic results after breast-conserving therapy. In our department LD flap has several uses. In addition to free microvascular flaps - which applies in breast reconstructive surgery is routine, there are clinical situations where the use of pedicled LD flap is justified. The main indications for its use are: the inability to apply microvascular flap, the general condition (diabetes, advanced atherosclerosis), smoking, previous surgery of abdominal wall, abdominal obesity, patient preferences. Approximately 30% of patients after breast reconstruction require corrective procedures. Group which uses extended LD flap account for 24 patients. In 16 cases it was used for elective breast reconstruction. In the remaining eight cases it was used in the corrective procedures symmetry and shape of the previously reconstructed breast. Based on our own experience it can be concluded that the LD flap with an alternative to microvascular techniques. Complication rate when using the LD flap is relatively low and includes: seroma and slight motor disability of the shoulder girdle.
    Źródło:
    Polish Journal of Surgery; 2012, 84, 7; 367-370
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Czerniaki złośliwe regionu głowy i szyi w materiale Kliniki Chirurgii Onkologicznej i Rekonstrukcyjnej Centrum Onkologii IMSC w Gliwicach
    Autorzy:
    Krakowczyk, Łukasz
    Maciejewski, Adam
    Grajek, Maciek
    Szymczyk, Cezary
    Wierzgoń, Janusz
    Jędrzejewski, Piotr
    Półtorak, Stanisław
    Powiązania:
    https://bibliotekanauki.pl/articles/1398663.pdf
    Data publikacji:
    2010
    Wydawca:
    Index Copernicus International
    Tematy:
    czerniak
    płaty wolne
    przeżycia pięcioletnie
    Opis:
    Introduction: About 25% of melanomas are localized in head and neck skin, and this particular localization is most difficult to treat, and the prognosis is less favorable. The depth of melanoma infiltration (Clark and Breslau grade) into the skin is the main factor of local advancement of the disease. Surgical treatment is an essential therapeutic modality in patients with melanoma. Aim: The aim of this study was to evaluate results of our surgical treatment of melanomas in head and neck localisation, treated from 1997 to 2007 in Department of Oncological and Reconstructive Surgery in Center of Oncology IMSC in Gliwice. Material: We analysed group of 47 patients (aged 26 to 75 years, mean 49), treated by surgical excision of malignant melanoma in the head and neck region. Most of the patiens required to use free fl aps or skin graft technique to close posexcisional defect, on basis of clinical considerations. Results: The 5-year total survival for all patients was 62% and were dependent on depht of melanoma infiltration and regional lymph node metastasis. The significant prognostic factors were: localization of primary focus, local progression of disease, free microscopical excision margins sex and age. Conclusions: Prognosis in the patients with melanoma of the head and neck is unreliable and dependent on local advancement of disease and localization of primary focus. Surgical treatment is an essential therapeutic modality in patients with melanoma. Adiuvant radiotherapy after surgical treatment of melanoma of the head and neck is intended for the patiens with high risk of local or regional recurence of disease.
    Źródło:
    Polish Journal of Otolaryngology; 2010, 64, 7; 55-59
    0030-6657
    2300-8423
    Pojawia się w:
    Polish Journal of Otolaryngology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    VDR gene single nucleotide polymorphisms and their association with risk of oral cavity carcinoma
    Autorzy:
    Małodobra-Mazur, Małgorzata
    Paduch, Agnieszka
    Lebioda, Arleta
    Konopacka, Maria
    Rogoliński, Jacek
    Szymczyk, Cezary
    Wierzgoń, Janusz
    Maciejewski, Adam
    Chmielik, Ewa
    Jonkisz, Anna
    Półtorak, Stanisław
    Dobosz, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1039670.pdf
    Data publikacji:
    2012
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    VDR gene
    SNP
    oral cavity cancer
    Opis:
    Vitamin D3 (1,25(OH)2D3 (1,25-dihydroxyvitamin D3)) is a hormone playing a crucial role in numerous biological processes in the human body, including induction and control of cell proliferation and differentiation. Numerous data relate the vitamin D3 level with various types of cancer. It has been suggested that SNPs in the vitamin D3 receptor (VDR) gene might influence both the risk of cancer occurrence and cancer progression. The aim of this study was to search for genetic correlations between individual SNPs in the VDR gene and the risk of oral cavity carcinoma. Two SNPs were selected based on the literature and our previous results. Seventy-three patients with squamous cell carcinoma of the head and neck and one hundred control subjects were investigated. Two SNPs in the VDR gene were genotyped in minisequencing reactions followed by capillary electrophoresis. Hardy-Weinberg equilibrium (HWE), the χ2 test and logistic regression were used for statistical analysis. The SNP rs2238135 in the VDR gene displayed statistical differences in frequency between the tested groups (p=0,0007). Furthermore, the G/C genotype of the rs2238135 in the VDR gene was characterized by a 3.16 fold increased risk of oral cavity carcinoma. The obtained results provide evidence for a genetic association between rs2238135 in the VDR gene and the occurrence and risk of oral cavity cancer.
    Źródło:
    Acta Biochimica Polonica; 2012, 59, 4; 627-630
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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