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    Wyświetlanie 1-12 z 12
    Tytuł:
    High quality repetitive control system for a grid-tied converter under distorted grid voltage conditions – design and implementation
    Autorzy:
    Ufnalski, Bartlomiej
    Straś, Andrzej
    Grzesiak, Lech M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2090719.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AC/DC power converter
    current control
    particle swarm optimization
    power quality
    repetitive control
    RC
    przetwornica mocy AC/DC
    kontrola prądu
    optymalizacja roju cząstek
    jakość prądu
    kontrola powtarzalna
    Opis:
    The paper features a grid-tied converter with a repetitive current controller. Our goal here is to demonstrate the complete design workflow for a repetitive controller, including phase lead, filtering and conditional learning. All key parameters, i.e., controller gain, filter and fractional phase lead, are designed in a single optimization procedure, which is a novel approach. The description of the design and optimization process, as well as experimental verification of the entire control system, are the most important contributions of the paper. Additionally, one more novelty in the context of power converters is verified in the physical system – a conditional learning algorithm to improve transient states to abrupt reference and disturbance changes. The resulting control system is tested experimentally in a 10 kW converter.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136739, 1--11
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High quality repetitive control system for a grid-tied converter under distorted grid voltage conditions – design and implementation
    Autorzy:
    Ufnalski, Bartlomiej
    Straś, Andrzej
    Grzesiak, Lech M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2173606.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    AC/DC power converter
    current control
    particle swarm optimization
    power quality
    repetitive control
    RC
    przetwornica mocy AC/DC
    kontrola prądu
    optymalizacja roju cząstek
    jakość prądu
    kontrola powtarzalna
    Opis:
    The paper features a grid-tied converter with a repetitive current controller. Our goal here is to demonstrate the complete design workflow for a repetitive controller, including phase lead, filtering and conditional learning. All key parameters, i.e., controller gain, filter and fractional phase lead, are designed in a single optimization procedure, which is a novel approach. The description of the design and optimization process, as well as experimental verification of the entire control system, are the most important contributions of the paper. Additionally, one more novelty in the context of power converters is verified in the physical system – a conditional learning algorithm to improve transient states to abrupt reference and disturbance changes. The resulting control system is tested experimentally in a 10 kW converter.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136739
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A novel Gly to Arg substitution at position 388 of the α1 chain of type I collagen in lethal form of osteogenesis imperfecta.
    Autorzy:
    Galicka, Anna
    Wolczynski, Slawomir
    Lesniewicz, Ryszard
    Chyczewski, Lech
    Gindzienski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/1043783.pdf
    Data publikacji:
    2002
    Wydawca:
    Polskie Towarzystwo Biochemiczne
    Tematy:
    osteogenesis imperfecta
    collagen
    Opis:
    Cultured skin fibroblasts from a proband with a lethal form of osteogenesis imperfecta produce two forms of type I collagen chains, with normal and delayed electrophoretic migration; collagen of the proband's mother was normal. Peptide mapping experiments localized the structural defect in the proband to α1(I) CB8 peptide in which residues 123 to 402 are spaned. Direct sequencing of amplified cDNA covering this region revealed a G to A single base change in one allele of the α1(I) chain, that converted glycine 388 to arginine. Restriction enzyme digestion of the RT-PCR product was consistent with a heterozygous COL1A1 mutation. The novel mutation conforms to the linear gradient of clinical severity for the α1(I) chain and results in reduced thermal stability by 3°C and intracellular retention of abnormal molecules.
    Źródło:
    Acta Biochimica Polonica; 2002, 49, 2; 443-450
    0001-527X
    Pojawia się w:
    Acta Biochimica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tests of a prototype spark-ignited, direct-injection engine powered by JET-A1 fuel
    Autorzy:
    Świątek, Piotr
    Fuć, Paweł
    Ziółkowski, Andrzej
    Świątek, Lech
    Melwiński, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/133682.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Naukowe Silników Spalinowych
    Tematy:
    alternative fuel
    test engine
    piston aircraft engine
    jet-a1
    paliwo alternatywne
    silnik testowy
    tłokowy silnik lotniczy
    Opis:
    The article presents a part of the work done in a research and development project being made by SWIATEK Lech Swiatek company. It describes the comparison of different fuels used in piston engines with JET-A1 turbine engine fuel. Next, the proposed combustion process of JET-A1 fuel and a prototype one-cylinder engine are described. In details, a special cylinder head and direct injection programmable computer are presented. In the next part, a designed and built test stand is described. Finally, the results and conclusions are presented. The designed test stand enabled to perform assumed tests. The innovative JET-A1 combustion process was possible to perform and the power and torque were higher in 1900-3000 rpm range than with the gasoline fuel. The designed GDI programmable injection computer enabled to fully control the injection and ignition parameters.
    Źródło:
    Combustion Engines; 2019, 58, 3; 117-120
    2300-9896
    2658-1442
    Pojawia się w:
    Combustion Engines
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chemical composition of surgical smoke formed in the abdominal cavity during laparoscopic cholecystectomy – Assessment of the risk to the patient
    Autorzy:
    Dobrogowski, Miłosz
    Wesołowski, Wiktor
    Kucharska, Małgorzata
    Sapota, Andrzej
    Pomorski, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/2178841.pdf
    Data publikacji:
    2014-05-17
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    risk factor
    surgical smoke
    xenobiotics
    absorbtion
    urine analysis
    laparoscopy
    Opis:
    Objectives: The aim of this study was to assess the exposure of patients to organic substances produced and identified in surgical smoke formed in the abdominal cavity during laparoscopic cholecystectomy. Material and Methods: Identification of these substances in surgical smoke was performed by the use of gas chromatography-mass spectrometry (GC-MS) with selective ion monitoring (SIM). The selected biomarkers of exposure to surgical smoke included benzene, toluene, ethylbenzene and xylene. Their concentrations in the urine samples collected from each patient before and after the surgery were determined by SPME-GC/MS. Results: Qualitative analysis of the smoke produced during laparoscopic procedures revealed the presence of a wide variety of potentially toxic chemicals such as benzene, toluene, xylene, dioxins and other substances. The average concentrations of benzene and toluene in the urine of the patients who underwent laparoscopic cholecystectomy, in contrast to the other determined compounds, were significantly higher after the surgery than before it, which indicates that they were absorbed. Conclusions: The source of the compounds produced in the abdominal cavity during the surgery is tissue pyrolysis in the presence of carbon dioxide atmosphere. All patients undergoing laparoscopic procedures are at risk of absorbing and excreting smoke by-products. Exposure of the patient to emerging chemical compounds is usually a one-time and short-term incident, yet concentrations of benzene and toluene found in the urine were significantly higher after the surgery than before it.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2014, 27, 2; 314-325
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infeasibility of endoscopic transmural drainage due to pancreatic pseudocyst wall calcifications - case report
    Autorzy:
    Krajewski, Andrzej
    Lech, Gustaw
    Makiewicz, Marcin
    Kluciński, Andrzej
    Wojtasik, Monika
    Kozieł, Sławomir
    Słodkowski, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/1393460.pdf
    Data publikacji:
    2017
    Wydawca:
    Index Copernicus International
    Tematy:
    postinflammatory pancreatic pseudocysts
    endoscopic transmural drainage
    calcifications in the pancreatic pseudocyst wall
    Opis:
    Postinflammatory pancreatic pseudocysts are one of the most common complications of acute pancreatitis. In most cases, pseudocysts self-absorb in the course of treatment of pancreatitis. In some patients, pancreatic pseudocysts are symptomatic and cause pain, problems with gastrointestinal transit, and other complications. In such cases, drainage or resection should be performed. Among the invasive methods, mini invasive procedures like endoscopic transmural drainage through the wall of the stomach or duodenum play an important role. For endoscopic transmural drainage, it is necessary that the cyst wall adheres to the stomach or duodenum, making a visible impression. We present a very rare case of infeasibility of endoscopic drainage of a postinflammatory pancreatic pseudocyst, impressing the stomach, due to cyst wall calcifications. A 55-year-old man after acute pancreatitis presented with a 1-year history of epigastric pain and was admitted due to a postinflammatory pseudocyst in the body and tail of pancreas. On admission, blood tests, including CA 19-9 and CEA, were normal. An ultrasound examination revealed a 100-mm pseudocyst in the tail of pancreas, which was confirmed on CT and EUS. Acoustic shadowing caused by cyst wall calcifications made the cyst unavailable to ultrasound assessment and percutaneous drainage. Gastroscopy revealed an impression on the stomach wall from the outside. The patient was scheduled for endoscopic transmural drainage. After insufflation of the stomach, a large mass protruding from the wall was observed. The stomach mucosa was punctured with a cystotome needle knife, and the pancreatic cyst wall was reached. Due to cyst wall calcifications, endoscopic drainage of the cyst was unfeasible. Profuse submucosal bleeding at the puncture site was stopped by placing clips. The patient was scheduled for open surgery, and distal pancreatectomy with splenectomy was performed. The histopathological examination confirmed the initial diagnosis of postinflammatory pancreatic pseudocyst. Endoscopic transmural drainage is a highly effective procedure for treating postinflammatory pancreatic pseudocysts. In some patents, especially with large pseudocysts, pseudocysts with calcified walls, and cysts of primary origin, resection should be performed.
    Źródło:
    Polish Journal of Surgery; 2017, 89, 1; 63-67
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analytical and numerical solving of right triangles with given a difference of two sides length and the acute angle
    Analityczno-numeryczne rozwiązywanie trójkątów prostokątnych gdzie dana jest różnica długości dwóch boków i kąt ostry
    Autorzy:
    Czajkowski, Andrzej Antoni
    Oleszak, Wojciech Kazimierz
    Snastin, Sławomir Wawrzyniec
    Rewkowski, Lech Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/136104.pdf
    Data publikacji:
    2018
    Wydawca:
    Wyższa Szkoła Techniczno-Ekonomiczna w Szczecinie
    Tematy:
    trigonometry
    right triangle
    acute angle
    difference of two sides length of a triangle
    numerical algorithm
    MS Excel
    MathCAD
    Mathematica
    trygonometria
    trójkąt prostokątny
    kąt ostry
    różnica długości dwóch boków trójkąta
    algorytm numeryczny
    Opis:
    Introduction and aims: The paper shows the analytical models of solving right triangles with appropriate discussion. For right triangles have been discussed six cases taking into account the acute angle and the difference of two sides length in the right triangle. The main aim of this paper is not only to create some analytical algorithms for solving right triangle, but also their implementation in programs MS-Excel, MathCAD and Mathematica. Material and methods: Elaboration of six analytical cases of solving right triangles has been made on the basis of the relevant trigonometric properties occurring in a right triangle. In the paper have been used some analytical and numerical methods by using MS-Excel, MathCAD and Mathematica programs. Results: As some results have been obtained numerical algorithms in the programs MS-Excel, MathCAD and Mathematica for six analytical cases of solving right triangles taking into ac-count the acute angle and the difference of two side length in the right triangle. Conclusion: Created numerical algorithms of solving the right triangles in the programs MS-Excel, MathCAD and Mathematica allow for faster significant performance calculations than the traditional way of using logarithms and logarithmic tables
    Wstęp i cele: W pracy pokazano analityczne modele rozwiązywania trójkątów prostokątnych wraz z odpowiednią dyskusją. Dla trójkątów prostokątnych omówiono sześć przypadków z uwzględnieniem kąta ostrego oraz różnicy długości dwóch boków trójkąta. Głównym celem jest pracy jest nie tylko utworzenie algorytmów analitycznych rozwiązywania takich trójkątów lecz również ich implementacja w programach MS-Excel, MathCAD i Mathematica. Materiał i metody: Opracowanie sześciu analitycznych przypadków rozwiązywania trójkątów prostokątnych wykonano opierając się odpowiednich własnościach trygonometrycznych występujących w trójkącie prostokątnym. Zastosowano metodę analityczną i numeryczną wykorzystując programy MS-Excel, MathCAD i Mathematica. Wyniki: Otrzymano algorytmy numeryczne w programach MS-Excel, MathCAD i Mathematica dla sześciu analitycznych przypadków rozwiązywania trójkątów prostokątnych z uwzględnieniem kąta ostrego oraz różnicy długości dwóch boków trójkąta. Wniosek: Utworzone algorytmy numeryczne rozwiązywania trójkątów prostokątnych w programach MS-Excel, MathCAD oraz Mathematica, pozwalają na znaczne szybsze wykonanie obliczeń niż drogą tradycyjną z użyciem logarytmów i tablic logarytmicznych.
    Źródło:
    Problemy Nauk Stosowanych; 2018, 9; 5-20
    2300-6110
    Pojawia się w:
    Problemy Nauk Stosowanych
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laparoscopic Treatment of Abdominal Hernia – 5 Years of Experience
    Autorzy:
    Litarski, Andrzej
    Pawełczyk, Jerzy
    Majcherek, Jarosław
    Janczak, Dawid
    Pawłowski, Lech
    Rucińska, Zuzanna
    Janczak, Dariusz
    Powiązania:
    https://bibliotekanauki.pl/articles/1395771.pdf
    Data publikacji:
    2014-08-01
    Wydawca:
    Index Copernicus International
    Tematy:
    abdominal hernia repair
    laparoscopy
    complications
    Opis:
    Laparoscopic surgery has become a well approved method of abdominal hernias treatment in recent years. Due to the advancement of laparoscopy and the use of improved synthetic materials laparoscopic surgery is characterized not only by low complication but also by a short period of recovery after surgery. The aim of the study was a retrospective analysis of the results of laparoscopic abdominal hernia surgeries (IPOM). Material and methods. Between year 2007 and 2012, 65 patients aged between 29 to 76 underwent laproscopic abdominal hernia surgeries due to either primary or postoperative abdominal hernias. All patients were examined in perioperative period, after 12 and 24 months after surgery in search of complications, pain and reccurence. Recovery period was also estimated. Results. In most cases postoperative pain was estimated from 1 to 4 on VAS scale. The most frequent complications were seromas that occured in 3 patients. The other complications were pneumothorax, wound hematoma and wound infection that occured once each. One patient required reoperation due to wound hematoma. Chronic postoperative pain was diagnosed in 3 patients and 4 recurrences were stated. Conclusions. Laparoscopic therapy of abdominal hernias is a safe operative method characterized by low recurrence and complication rates as well as short hospital stay and quick recovery. This technique is restricted by high material costs and the lack of full refund for the procedure.
    Źródło:
    Polish Journal of Surgery; 2014, 86, 8; 353-358
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Health risk to medical personnel of surgical smoke produced during laparoscopic surgery
    Autorzy:
    Dobrogowski, Miłosz
    Wesolowski, Wiktor
    Kucharska, Małgorzata
    Paduszyńska, Katarzyna
    Dworzyńska, Agnieszka
    Szymczak, Wiesław
    Sapota, Andrzej
    Pomorski, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/2177163.pdf
    Data publikacji:
    2015-07-29
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    smoke
    exposure
    volatile organic compounds
    dioxins
    health risk
    laparoscopic cholecystectomy
    pyrolysis
    Opis:
    Objectives During laparoscopic cholecystectomy, the removal of the gall bladder, pyrolysis occurs in the peritoneal cavity. Chemical substances which are formed during this process escape into the operating room through trocars in the form of surgical smoke. The aim of this study was to identify and quantitatively measure a number of selected chemical substances found in surgical smoke and to assess the risk they carry to medical personnel. Material and Methods The study was performed at the Maria Skłodowska-Curie Memorial Provincial Specialist Hospital in Zgierz between 2011 and 2013. Air samples were collected in the operating room during laparoscopic cholecystectomy. Results A complete qualitative and quantitative analysis of the air samples showed a number of chemical substances present, such as aldehydes, benzene, toluene, ethylbenzene, xylene, ozone, dioxins and others. Conclusions The concentrations of these substances were much lower than the hygienic standards allowed by the European Union Maximum Acceptable Concentration (MAC). The calculated risk of developing cancer as a result of exposure to surgical smoke during laparoscopic cholecystectomy is negligible. Yet it should be kept in mind that repeated exposure to a cocktail of these substances increases the possibility of developing adverse effects. Many of these compounds are toxic, and may possibly be carcinogenic, mutagenic or genotoxic. Therefore, it is necessary to remove surgical smoke from the operating room in order to protect medical personnel.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2015, 28, 5; 831-840
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The relationship between working memory and emotion regulation strategies
    Autorzy:
    Jasielska, Aleksandra
    Kaczmarek, Lech
    Brońska, Aleksandra
    Dominiak, Maria
    Niemier, Karolina
    Patalas, Daria
    Sokołowski, Andrzej
    Tomczak, Martyna
    Powiązania:
    https://bibliotekanauki.pl/articles/2127835.pdf
    Data publikacji:
    2019-04-05
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
    Tematy:
    working memory
    emotion regulation strategies
    cognitive reappraisal
    positive reappraisal
    Opis:
    The article focuses on the results of a study on the relationship between working memory and emotion regulation. The relationship between working memory and emotion regulation is expected to manifest itself especially in situations of applying emotion regulation strategies that engage cognitive resources, such as cognitive reappraisal and positive reappraisal. We assumed that, compared to participants low in working memory capacity, participants high in working memory capacity would report using the above strategies more frequently. In our study (N = 65), the participants completed two questionnaires: the Emotion Regulation Questionnaire and the Cognitive Emotion Regulation Questionnaire, as well as a well-validated measure of working memory capacity known as the Operation Span Task. Our hypotheses were confirmed. The results were interpreted in relation to such constructs as temporal organization of emotion regulation strategies, affective flexibility, or forms of reappraisal.
    Źródło:
    Roczniki Psychologiczne; 2015, 18, 4; 567-578
    1507-7888
    Pojawia się w:
    Roczniki Psychologiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationships between serum selenium and zinc concentrations versus profibrotic and proangiogenic cytokines (FGF-19 and endoglin) in patients with alcoholic liver cirrhosis
    Autorzy:
    Prystupa, Andrzej
    Kiciński, Paweł
    Luchowska-Kocot, Dorota
    Błażewicz, Anna
    Kurys-Denis, Ewa
    Niedziałek, Jarosław
    Sak, Jarosław
    Panasiuk, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/990858.pdf
    Data publikacji:
    2017
    Wydawca:
    Instytut Medycyny Wsi
    Tematy:
    liver cirrhosis
    alcohol
    selenium
    zinc
    fibroblast growth factor-19
    endoglin
    Opis:
    Introduction and objective. Liver cirrhosis is a disease involving the liver parenchyma, which is characterised by fibrosis. and impaired architectonics of the parenchyma with regenerative nodules. The aim of the study was to determine the relationship between stage of alcoholic liver cirrhosis, concentrations of selenium, zinc and profibrotic and proangiogenic cytokines (FGF-19, ENG). Materials and method. The study included 99 patients with alcoholic cirrhosis and 20 healthy subjects. Ion chromatography with UV/VIS detection was used for determination of zinc ions in the previously mineralized serum samples. The measurements of selenium were performed with the ContrAA700 high-resolution continuum source graphite tube atomic absorption spectrometer. ELISA was used to determine concentration of FGF-19 and ENG in serum samples. Results. Concentrations of zinc and selenium were significantly decreased in cirrhotic patients (p<0.001 for both). The highest concentration of FGF-19 was found in Child-Pugh stage C liver cirrhosis patients (806.9±650.3 pg/ml), and was significantly higher than observed in controls (p=0.005) and stage A patients (compensated cirrhosis) (p=0.02). The highest concentration of ENG was demonstrated in the control group (3.24±148 ng/ml) while the lowest in patients with decompensated cirrhosis (7.32±5.39 ng/ml and 7.92±4.18 ng/ml for stage B and C; p=0.03 and p=0.02, respectively). The use of the multiple-variable model demonstrated that the independent factors affecting the concentration of ENG were the concentration of bilirubin (p=0.02), INR (p=0.01) and duration of alcohol abuse (p=0.02). The independent determinants of FGF-19 concentrations were found to be the stage (severity) of liver cirrhosis (p=0.04) and INR (p=0.03). Conclusions. Concentrations of zinc and selenium in serum of patients with alcoholic liver cirrhosis are not independently related to concentrations of FGF-19 and ENG.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2017, 24, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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