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    Wyświetlanie 1-6 z 6
    Tytuł:
    Simple Wide Frequency Range Impedance Meter Based on AD5933 Integrated Circuit
    Autorzy:
    Chabowski, K.
    Piasecki, T.
    Dzierka, A.
    Nitsch, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/221804.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    impedance
    converter
    AD5933
    system-on-a-chip
    measurement
    Opis:
    As it contains elements of complete digital impedance meter, the AD5933 integrated circuit is an interesting solution for impedance measurements. However, its use for measurements in a wide range of impedances and frequencies requires an additional digital and analogue circuitry. This paper presents the design and performance of a simple impedance meter based on the AD5933 IC. Apart from the AD5933 IC it consists of a clock generator with a programmable prescaler, a novel DC offset canceller for the excitation signal based on peak detectors and a current to voltage converter with switchable conversion ratios. The authors proposed a simple method for choosing the measurement frequency to minimalize errors resulting from the spectral leakage and distortion caused by a lack of an anti-aliasing filter in the DDS generator. Additionally, a novel method for the AD5933 IC calibration was proposed. It consists in a mathematical compensation of the systematic error occurring in the argument of the value returned from the AD5933 IC as a result. The performance of the whole system is demonstrated in an exemplary measurement.
    Źródło:
    Metrology and Measurement Systems; 2015, 22, 1; 13-24
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impedance Sensors Made in PCB and LTCC Technologies for Monitoring Growth and Degradation of Pseudomonal Biofilm
    Autorzy:
    Chabowski, K.
    Junka, A. F.
    Piasecki, T.
    Nowak, D.
    Nitsch, K.
    Smutnicka, D.
    Bartoszewicz, M.
    Moczała, M.
    Szymczyk, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/221326.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Pseudomonas aeruginosa
    biofilm
    interdigitated sensor
    impedance spectroscopy
    Opis:
    The suitability of low-cost impedance sensors for microbiological purposes and biofilm growth monitoring was evaluated. The sensors with interdigitated electrodes were fabricated in PCB and LTCC technologies. The electrodes were golden (LTCC) or gold-plated (PCB) to provide surface stability. The sensors were used for monitoring growth and degradation of the reference ATCC 15442 Pseudomonas aeruginosa strain biofilm in invitro setting. During the experiment, the impedance spectra of the sensors were measured and analysed using electrical equivalent circuit (EEC) modelling. Additionally, the process of adhesion and growth of bacteria on a sensor’s surface was assessed by means of the optical and SEM microscopy. EEC and SEM microscopic analysis revealed that the gold layer on copper electrodes was not tight, making the PCB sensors susceptible to corrosion while the LTCC sensors had good surface stability. It turned out that the LTCC sensors are suitable for monitoring pseudomonal biofilm and the PCB sensors are good detectors of ongoing stages of biofilm formation.
    Źródło:
    Metrology and Measurement Systems; 2017, 24, 2; 369-380
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ organizacji przezbrojeń na efektywność zasobów technicznych
    Influence of changeovers organization on effectiveness of technical resources
    Autorzy:
    Chabowski, P.
    Żywicki, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/269867.pdf
    Data publikacji:
    2013
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    organizacja przezbrojeń
    maszyna
    zasoby
    SMED
    changeovers organization
    machine
    resources
    Single Minute Exchange of Die
    Opis:
    Artykuł przedstawia zagadnienia związane z koncepcją szczupłego wytwarzania dotyczącą wpływu czasu przezbrojeń maszyn produkcyjnych na całkowitą efektywność wyposażenia. W artykule przybliżono etapy wdrażania koncepcji SMED, oraz ich wpływ na wzrost wskaźnika OEE. Przedstawiono przykład usprawnienia procesu przezbrojeń w firmie zajmującej się przetwórstwem tworzyw sztucznych. Pracę zakończono podsumowaniem, które przedstawia najważniejsze rezultaty dokonanych usprawnień, dotyczących procesu przezbrojenia formy wtryskowej.
    The article presents the issues related to the concept of lean manufacturing on changeovers time relating to the effect on the total production machinery equipment effectiveness. The article brought closer SMED concept stages of implementation and their impact on increase the OEE. The article presents an example of improvement of the changeovers in the company involved in the plastic processing. The work was completed by summary that presents the main results made improvements on the process of mold changeover.
    Źródło:
    Inżynieria Maszyn; 2013, R. 18, z. 1; 60-70
    1426-708X
    Pojawia się w:
    Inżynieria Maszyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmniejszenie udziału czasów przezbrajania w dostępnym czasie pracy maszyn
    Reduction of changeover times in the available time of work machines
    Autorzy:
    Żywicki, K.
    Chabowski, P.
    Dworczak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/339997.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Zarządzania Produkcją
    Tematy:
    SMED
    production planning
    production scheduling
    Lean Manufacturing
    planowanie produkcji
    elastyczność produkcji
    przezbrojenie
    Opis:
    The article presents an analysis of three options to reduce the share of changeovers time in the available time of working machines. The first option concerns the reduction of the number and share of changeover times by grouping them in the production schedule by technologically similarity. The similarity is understood as production of products using the same settings of machines or using the same equipment. For the purpose of such approach patterns of clustering and queuing production orders in work schedules machines are formed. This enables the rapid and substantial reduction in the share of changeovers in the available working time of machine without interfering with the retooling process itself. By only knowing the structure of retooling and extract these essential elements, which by pooling and templates queuing can be avoided. In this case, increase the efficiency of the machine is achieved, however, at the same time stocks of both semi-finished and finished products increases and extends the duration of the customer contracts internal or external. The second variant is related to the analysis of the effect of shortening changeover times on the availability of machines. This approach was applied to organizational changes of retooling of machines in accordance with SMED method. This requires the involvement of all people involved in the process and examine depth of the whole process of retooling. At the same time this allows for a significant improvement in the efficiency of the machine without increasing inventory and maximizing production orders. The third analysis includes the simultaneous application of queuing pattern of production orders for individual products in the schedules of the machine and to shorten setup times. This approach allows for rapid improvement of the equipment with relatively low effort and cost.
    Źródło:
    Zarządzanie Przedsiębiorstwem; 2015, 18, 3; 35-40
    1643-4773
    Pojawia się w:
    Zarządzanie Przedsiębiorstwem
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metodyka postępowania przy wprowadzaniu poziomowanej produkcji
    Creation of repeatable production plan
    Autorzy:
    Rewers, P.
    Hamrol, A.
    Żywicki, K.
    Chabowski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/339931.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Zarządzania Produkcją
    Tematy:
    poziomowanie produkcji
    planowanie produkcji
    wskaźnik EPEI
    production leveling
    EPEI
    production plan
    Opis:
    This article presents an original methodology of implementation of repeatable production plan. After analyzing the available literature, both Polish and world, and their own thoughts, it was found that the available methods of implementation production leveling are imprecise or difficult to implement in real conditions. Accordingly, an attempt was made creation of such to the methodology that would be simple to implement the in enterprises. The methodology consists of six steps procedure. The first step is to choose products which will be implemented leveled production. For this purpose uses a sieve Glenday. Sieve Glenday allows it to designate products made of green group that is, those that are most commonly sold. The next step is the division of products families, according to the similarity criterion of technological products. For this purpose uses matrix similarity technological products. The third step is the analysis of customer orders for products from the green group. For this purpose to be determined the average weekly sales of products. Then, on the basis of the forecast is calculated weekly forecast accuracy. This step is particularly important to the company so far has proven demand fluctuations and verifiability forecasts. The fourth step is to determine the frequency of repetitions production products. This is done using EPEI gauge, which informs how often it is possible to produce the next sequence products.. The next step is determining the volume of stocks: cycle, buffer, safety in the warehouse of finished products. In the production leveling it said that the store is called. Supermarket different from the traditional magazine primarily that is always retained FIFO. The last step is to create reproducible production plan. To check the leveling of production to be determined gauges the effectiveness of the leveling of production, for example volume of stocks, production capacity, etc. Evaluation of effectiveness of the leveling of production is particularly important because it helps determine whether production leveling brought the desired effect or not. Presented in the article the methodology is under development. The next step of the work will attempt to test the methodology in real conditions in the enterprise.
    Źródło:
    Zarządzanie Przedsiębiorstwem; 2016, 19, 3; 22-30
    1643-4773
    Pojawia się w:
    Zarządzanie Przedsiębiorstwem
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Is upper gastrointestinal bleeding still a life-threatening condition?
    Autorzy:
    Janczak, D.
    Marschollek, P.
    Marschollek, K.
    Owczarzak, M.
    Bakowski, W.
    Bakowska, K.
    Chabowski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1719.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Opolski. Instytut Nauk o Zdrowiu
    Opis:
    Background: Upper gastrointestinal bleeding is a common clinical problem and one of the main reasons for emergency hospitalization. It is associated with an overall mortality rate of 2% to 13%, despite advances in medical therapy. First-choice management is conservative treatment with endoscopic hemostasis. Aim of the study: The aim of the study was to examine the epidemiological and clinical characteristics of patients with upper gastrointestinal bleeding with a focus on the course of hospitalization based on the etiology Material and methods: A retrospective study was conducted in the Department of Surgery at the 4th Military Teaching Hospital in the years 2011–2016, comprising a total of 200 hospitalizations. 150 (75%) of the study group were men, and the mean age was 63.6±15.8 years. Results: Patients most frequently presented with melena (n=105; 53.1%) and hematemesis (n=79; 40%) or coffee ground vomiting (n=57; 28.7%). . 138 (69%) of hemorrhages were managed with endoscopic hemostasis, and in 43 (21.5%) of cases conservative treatment was adequate. In 12 (6%) of cases, laparotomy was the first-choice therapy and in 7 (3.5%) cases, surgery was performed after an attempt at endoscopic treatment had failed. The sources of bleeding were: gastric ulcer – 58 (29%), duodenal ulcer – 48 (24%), esophageal varices – 31 (15.5%), gastric tumor – 15 (7.5%), Mallory-Weiss syndrome – 10 (5%), and Dieulafoy’s lesion – 3 (1.5%). 16 (8%) of the hospitalizations were fatal. Conclusions: Upper gastrointestinal bleeding still has a high mortality rate (8%). It more frequently affects men and the elderly. Gastric and duodenal ulcers are the most common etiologies of bleeding. Esophageal varices and neoplasms are also a significant source of bleeding. Despite the progress in the pharmacological treatment of peptic ulcers, the complications resulting from gastrointestinal bleeding continue to be a serious clinical problem.
    Źródło:
    Medical Science Pulse; 2019, 13, 2
    2544-1558
    2544-1620
    Pojawia się w:
    Medical Science Pulse
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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