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Wyszukujesz frazę "Tymkiewicz, J." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
Śląska Szkoła Badań Jakościowych – 20 lat doświadczeń i wniosków z prowadzenia badań jakościowych w budynkach o różnych funkcjach użytkowych
Silesian School of Qualitative Research – 20 years of experience and lessons of quality research in buildings with different utility functions
Autorzy:
Tymkiewicz, J.
Kucharczyk-Brus, B.
Powiązania:
https://bibliotekanauki.pl/articles/293811.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
badania jakościowe
Śląska Szkoła Badań Jakościowych
qualitative research
Silesian School of Qualitative Research
Opis:
Artykuł składa się z dwóch części. Pierwsza z nich prezentuje dorobek zespołu naukowców i dydaktyków z Wydziału Architektury Politechniki Śląskiej w Gliwicach, którzy od 20 lat realizują badania jakościowe środowiska zbudowanego. Przedstawiono powstanie oraz rozwój Śląskiej Szkoły Badań Jakościowych, specjalizacje i wybrany dorobek publikacyjny zespołu, ogólne informacje o stosowanych technikach i narzędziach badawczych, a także o metodyce przeprowadzania badań terenowych. Druga część artykułu to szczegółowy opis ewaluacji wykonanych w ramach dwóch projektów badawczych. Całość zakończono praktycznymi wnioskami z przeprowadzonych badań jakościowych.
The paper consists of two parts. The first presents the achievements of the team of scientists and teachers from the Faculty of Architecture, Silesian University of Technology, who have carried out scientific and teaching work in the field of built environment qualitative research for 20 years. The origin and development of the “Silesian School of Qualitative Research” is presented, specializations and selected publishing achievements of the team, general information about the applied techniques and research tools, as well as the methodology of conducting field research. The second part of the paper is a detailed description of housing environment evaluation carried out within the framework of two research projects. The paper is completed with practical conclusions from the conducted qualitative research processes.
Źródło:
Architectus; 2017, 1 (49); 63-80
1429-7507
2084-5227
Pojawia się w:
Architectus
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Possible temperature increases in soft tissues in the case of nonlinear and linear wave propagation
Autorzy:
Filipczyński, L.
Kujawska, T.
Tymkiewicz, R.
Wójcik, J.
Powiązania:
https://bibliotekanauki.pl/articles/332225.pdf
Data publikacji:
1997
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
It is well known that the nonlinear propagation increases the absorption of acoustic waves in the medium thus increasing the temperature effects. According to the recently developed new theoretical approach it is possible to determine in a simple way the effective absorption in the case of nonlinear propagation basing on the pulse spectrum analysis [Wójcik, 1996]. In this way it was possible to find the corresponding absorption values occuring in ultrasonography. In this case a classical PVDF membrane hydrophone was used to demonstrate and to measure nonlinear effects. Analysing the obtained wave spectra it was possible to determine the increase of the effective tissue absorption and hence to find the rate of heat generation per unit volume which is crucial for temperature elevations In this way possible temperature increases for the case of nonlinear and linear propagation can be determined.
Źródło:
Hydroacoustics; 1997, 1; 329-332
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ilościowa ocena nieliniowej propagacji w wodzie i w tkance
Autorzy:
Filipczyński, L.
Kujawska, T.
Tymkiewicz, R.
Wójcik, J.
Powiązania:
https://bibliotekanauki.pl/articles/331916.pdf
Data publikacji:
2000
Wydawca:
Polskie Towarzystwo Akustyczne
Opis:
Nonlinear propagation effects were investigated numerically and experimentally u wate r and In blood from the point of view of ultrasonic diagnostic applications in cardlology. Pressure distributions of short and long pulses with the frequency of 3 and 3.5 MHz, radiated by a typical cardiological probe, were found along the ultrasonic beam axis. The numerial results were obtained by means of the numerical code Wf developed previously. The experimental pressure distributions were measured by memu of a membrane PYDF hydrophone. The obtained numerical and experimental results show ing the distributions of the 2-nd and I -st harmonics have shown good agreement allowing us to determine some diagnostic conclusions.
Źródło:
Hydroacoustics; 2000, 3; 53-56
1642-1817
Pojawia się w:
Hydroacoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Annular Array Transducer and Matched Amplifier for Therapeutic Ultrasound
Autorzy:
Secomski, W.
Nowicki, A.
Wójcik, J.
Lewandowski, M.
Walczak, M.
Tymkiewicz, R.
Powiązania:
https://bibliotekanauki.pl/articles/177840.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasonic therapy
annular array transducer
ultrasonic field
Opis:
The use of therapeutic ultrasound continues to grow. A focused ultrasonic wave can increase the tissue temperature locally for the non-invasive cancer treatment or other medical applications. The authors have designed a seven-element annular array transducer operating at 2.4 MHz. Each element was excited by sine burst supplied by a linear amplifier and FPGA control circuits. The acoustic field, generated by a transducer was initially numerically simulated in a computer and next compared to water tank hydrophone measurements performed at 20, 40 and 60 mm focal depth. The results showed good agreement of the measurements with theory and the possibility to focus the ultrasound in the preselected area. The total acoustic power radiated by the annular array was equal to 2.4 W.
Źródło:
Archives of Acoustics; 2010, 35, 4; 653-660
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thick Film Transducers for High Frequency Coded Ultrasonography
Autorzy:
Nowicki, A.
Lewandowski, M.
Wójcik, J.
Tymkiewicz, R.
Lou-Moller, R.
Wolny, W.
Zawada, T.
Powiązania:
https://bibliotekanauki.pl/articles/176939.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
transducers
thick film
high frequency ultrasound
pulse compression
Golay codes
Opis:
Recently a new technology of piezoelectric transducers based on PZT thick film has been developed as a response to a call for devices working at higher frequencies suitable for production in large numbers at low cost. Eight PZT thick film based focused transducers with resonant frequency close to 40 MHz were fabricated and experimentally investigated. The PZT thick films were deposited on acoustically engineered ceramic substrates by pad printing. Considering high frequency and nonlinear propagation it has been decided to evaluate the axial pressure field emitted (and reflected by thick metal plate) by each of concave transducer differing in radius of curvature – 11 mm, 12 mm, 15 mm, 16 mm. All transducers were activated using AVTEC AVG-3A-PS transmitter and Ritec diplexer connected directly to Agilent 54641D oscilloscope. As anticipated, in all cases the focal distance was up to 10% closer to the transducer face than the one related to the curvature radius. Axial pressure distributions were also compared to the calculated ones (with the experimentally determined boundary conditions) using the angular spectrum method including nonlinear propagation in water. The computed results are in a very good agreement with the experimental ones. The trans- ducers were excited with Golay coded sequences at 35–40 MHz. Introducing the coded excitation allowed replacing the short-burst transmission at 20 MHz with the same peak amplitude pressure, but with almost double center frequency, resulting in considerably better axial resolution. The thick films exhibited at least 30% bandwidth broadening comparing to the standard PZ 27 transducer, resulting in an increase in matching filtering output by a factor of 1.4–1.5 and finally resulting in a SNR gain of the same order.
Źródło:
Archives of Acoustics; 2011, 36, 4; 945-954
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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