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    Wyświetlanie 1-9 z 9
    Tytuł:
    Optimal state feedback controller for balancing cube
    Autorzy:
    Kowalczyk, Adam
    Piotrowski, Robert
    Powiązania:
    https://bibliotekanauki.pl/articles/27314202.pdf
    Data publikacji:
    2022
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    balancing cube
    control systems
    linear quadratic regulator
    mathematical model
    physical model
    Opis:
    In this paper, a nonlinear balancing cube system is considered, the concept for which is based on an inverted pendulum. The main purpose of this work was the modelling and construction of a balancing cube with the synthesis of the control system. The control objectives included swing-up and stabilization of the cube on its vertex at an unstable equilibrium. Execution of the intended purpose required, first, deriving a cognitive mathematical model. It was based on the Lagrange method. Next, a mathematical model for control purposes was derived. The project of the physical model of the balancing cube was presented. A stabilization system based on a linear quadratic regulator (LQR) was developed. Moreover, a swing-up mechanism was used to bring the cube close to the upper equilibrium point. The algorithm switching condition was important to enable the correct functioning of the system. The developed control system was verified in the Matlab environment. Finally, verifying experiments and comparisons among models (mathematical and physical) were performed.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2022, 16, 3; 3--12
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Using conditional averaging of delayed signals to measure phase shift angle
    Autorzy:
    Kowalczyk, Adam
    Szlachta, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2173906.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conditional averaging
    delayed signal
    mean value
    Opis:
    A novel measurement method and a brief discussion of basic characteristics of measuring the phase shift angle between two sinusoidal signals of the same frequency are presented in this paper. It contains a mathematical model for using conditional averaging of a delayed signal interfered with noise to measure the phase shift angle. It also provides characteristics of conditional mean values and discusses the effect of random interferences on the accuracy of the phase shift measurement. The way to determine the variance of the conditional mean value, together with the assessment of standard and expanded uncertainty, are described. The uncertainty characteristic shows the complementary properties of the discussed angle measurement principle for small absolute values || (minimum for = 0) relative to the correlation principle, where the minimum measurement uncertainty is present for = /2
    Źródło:
    Metrology and Measurement Systems; 2022, 29, 4; 655--667
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ANALYSIS OF POLYPHENOLIC COMPOSITION AND STABILITY OF MAGISTRAL PREPARATION BASED ON SALVIAE OFFICINALIS FOLIUM
    Autorzy:
    Kowalczyk, Adam
    Tuberoso, Carlo I.
    Włodarczyk, Maciej
    Fecka, Izabela
    Powiązania:
    https://bibliotekanauki.pl/articles/895374.pdf
    Data publikacji:
    2020-02-29
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Tematy:
    flavonoids
    phenolic acids
    complexes
    Salvia officinalis
    magistral preparation
    Opis:
    A magistral preparation based on the sage leaf decoction or infusion is one of the most popular herbal prescription prepared in pharmacies in Lower Silesia (Poland) for gargling in the pharyngitis or mouth infections. Other components of this preparation are boric acid, aluminum(III) acetotartrate or Burow's solution, and glycerol. The study aimed to investigate the polyphenolic composition and relations between herbal and chemical ingredients that are present in this mixture in comparison with the traditional aqueous galenic forms – infusion and decoction. The analysis was performed using HPLC-DAD and ESI-MS methods. The main polyphenolic ingredients of sage leaf were rosmarinic acid and luteolin 7-O-β-glucuronide. The content of analyzed polyphenols was higher in the decoction than in the infusion. The pharmacological activity of the examined mixture results from the presence of boric acid, aluminum(III) salts and polyphenolic components of sage leaf. The study showed that in the presence of excess salts of aluminum(III) and boric acid, sage polyphenols are partially soluble in an aqueous medium (mainly phenolic acids) and complexed as precipitated sediment (especially flavonoids). The aqueous solutions of this preparation are cloudy, which suggests limited solubility of the formed complexes. Therefore, the therapeutic activity of the sage leaf magistral preparation should be associated with the presence of water soluble caffeic acid esters like rosmarinic acid. The influence of luteolin glycosides coordination complexes is not evident. The obtained results also confirm the stability of the examined formula in the conditions of cold storage (4-6 °C) within 7 days from its production.
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2020, 77, 1; 131-143
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE USE OF OTC HERBAL SEDATIVES BY PHARMACY PATIENTS – A QUESTIONNAIRES-BASED SURVEY STUDY
    Autorzy:
    Kowalczyk, Adam
    Kurpas, Donata
    Bodalska, Agnieszka
    Han, Stanislaw
    Kuchar, Ernest
    Marciniak, Dominik
    Fecka, Izabela
    Karlowicz-Bodalska, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/895681.pdf
    Data publikacji:
    2019-08-30
    Wydawca:
    Polskie Towarzystwo Farmaceutyczne
    Źródło:
    Acta Poloniae Pharmaceutica - Drug Research; 2019, 76, 4; 769-775
    0001-6837
    2353-5288
    Pojawia się w:
    Acta Poloniae Pharmaceutica - Drug Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ON SOME COEFFICIENT INEQUALITY IN THE SUBCLASS OF CLOSE-TO-CONVEX FUNCTIONS
    O PEWNEJ NIERÓWNOSCI DLA WSPÓŁCZYNNIKÓW W PODKLASIE FUNKCJI PRAWIE WYPUKŁYCH
    Autorzy:
    Kowalczyk, Bogumiła
    Lecko, Adam
    Smiarowska, Barbara
    Powiązania:
    https://bibliotekanauki.pl/articles/699826.pdf
    Data publikacji:
    2017
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Źródło:
    Bulletin de la Société des Sciences et des Lettres de Łódź, Série: Recherches sur les déformations; 2017, 67, 1
    1895-7838
    2450-9329
    Pojawia się w:
    Bulletin de la Société des Sciences et des Lettres de Łódź, Série: Recherches sur les déformations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prevention of threats from the area of food defence and food fraud on the example of the sushi&food factor company
    Autorzy:
    Górna, Justyna
    Brzechwa, Adam
    Kowalczyk, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/27313493.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    food defence
    food fraud
    food safety
    obrona żywności
    oszustwa żywnościowe
    bezpieczeństwo żywności
    Opis:
    Purpose: The main purpose of this article was to present the actions taken by the company in the field of its food defence and food fraud. Design/methodology/approach: The article presents the approach used in the analyzed company to supervise the food defence and food fraud area. As part of the analysis, the applicable documents in the scope of the conducted risk analyzes were presented. The adopted methodology for the evaluation of raw materials and their suppliers in the food fraud area is based on the IFS guidelines, as well as an approach developed by the authors of this study, who participated in the implementation of this methodology in the company. Findings: The presented approach to supervision in the area of food defence and food fraud in the analyzed company ensures its continuous development depending on the changing environment and risk factors. The Sushi&Food Factor company is characterized by a high culture of safety and quality of the produced food. Actions are still being taken to support its development in various areas, such as communication, employee involvement, risk awareness. The activities used by the company related to the verification of the effectiveness of supervision over the areas of food defence and food fraud, such as the simulation of unauthorized access or the review and assessment of incidents that have currently occurred on the market, allow for the necessary preventive measures to be taken. Originality/value: The article presents a practical approach to the implementation of the requirements of standards in the area of food defence and food fraud. The article may be an element influencing the improvement of activities in the discussed areas in other enterprises, which may contribute to the development of their food safety and quality culture.
    Źródło:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska; 2022, 162; 181--196
    1641-3466
    Pojawia się w:
    Zeszyty Naukowe. Organizacja i Zarządzanie / Politechnika Śląska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    THE BOUNDS OF SOME DETERMINANTS FOR FUNCTIONS OF BOUNDED TURNING OF ORDER ALPHA
    OSZACOWANIA PEWNYCH WYZNACZNIKÓW DLA FUNKCJI O OGRANICZONYM OBROCIE RZĘDU ALFA
    Autorzy:
    Kowalczyk, Bogumiła
    Kwon, On Sang
    Lecko, Adam
    Sim, Young Jae
    Powiązania:
    https://bibliotekanauki.pl/articles/699856.pdf
    Data publikacji:
    2017
    Wydawca:
    Łódzkie Towarzystwo Naukowe
    Źródło:
    Bulletin de la Société des Sciences et des Lettres de Łódź, Série: Recherches sur les déformations; 2017, 67, 1
    1895-7838
    2450-9329
    Pojawia się w:
    Bulletin de la Société des Sciences et des Lettres de Łódź, Série: Recherches sur les déformations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk factors for impaired wound healing and prolonged hospitalization in patients after amputation of the lower limb above the knee joint
    Autorzy:
    Orłowski, Maciej
    Pluta, Paulina
    Kowalczyk, Aleksandra
    Kasprzak-Szczepańska, Katarzyna
    Pająk, Marta
    Dziki, Adam
    Powiązania:
    https://bibliotekanauki.pl/articles/1392074.pdf
    Data publikacji:
    2019
    Wydawca:
    Index Copernicus International
    Tematy:
    amputation
    impaired healing
    risk factors
    stump
    Opis:
    ntroduction: Lower limb amputation is a surgery performed as a last resort, when all other therapeutic options have been exhausted. The duration of treatment lasts from a few to several months and depends on the extent of amputation, the patient's overall health and the course of the stump healing process. Materials and methods: A retrospective analysis was performed using the database of the General and Vascular Surgery Ward of the Nikolay Pirogov Regional Specialist Hospital in Łódź. Patients who underwent lower limb amputation at the transfemoral level in 2017 were analyzed. 92 patients undergoing surgery were qualified for the study. Patients were divided into two groups: those with no healing complications and those with stump healing complications. Medical records of both groups were analyzed for risk factors for impaired healing. The obtained data were subjected to statistical analysis. Results: Patients with impaired stump healing most often had minimal bleeding and higher ASA scores compared to patients without healing complications. No differences between the two groups were found for the remaining parameters. Patients with complications needed an average of 28 days to heal the wound and spent an average of 40 days in hospital, compared to 14 and 21 days, respectively, for patients without complications. The percentage of deaths in the group of patients with complications was also significantly higher (35%) than in the group of patients without complications (5%). Conclusions: Statistically significant factors increasing the risk of impaired stump healing include high ASA scale and minimal muscle bleeding during surgery. Patients who experienced this complication are at greater risk of prolonged hospitalization and death in the postoperative period. This study showed statistically significant risk factors for impaired stump healing following amputation and confirmed the negative impact of this complication on the length of hospitalization and risk of death.
    Źródło:
    Polish Journal of Surgery; 2019, 91, 5; 27-33
    0032-373X
    2299-2847
    Pojawia się w:
    Polish Journal of Surgery
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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