Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "Leśna, P." wg kryterium: Wszystkie pola


Wyświetlanie 1-2 z 2
Tytuł:
Subjective Evaluation of Classroom Acoustics by Teenagers vs. Reverberation Time
Autorzy:
Leśna, P.
Skrodzka, E.
Powiązania:
https://bibliotekanauki.pl/articles/1537505.pdf
Data publikacji:
2010-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.55.Hy
Opis:
A questionnaire was developed to evaluate acoustics in classrooms. The group of 279 pupils from 7 schools in age from 11 till 17 years were tested. The subjective evaluation was accompanied by objective measurements of reverberation time in 11 classrooms. The questionnaire was based on five point differential scales and consisted of six questions about acoustic comfort, teacher voice clarity, speech comprehension, evaluation of different noise sources intensity, annoyance and consequences of noise in the classroom. The results of statistical analysis of subjective answers and physical measurements of reverberation time were correlated. After analysis it was found that clarity of teacher voice and speech comprehension scores lowered for increasing reverberation time and was not statistically significant. Acoustic comfort score was also lower for increasing reverberation time but only in a group of pupils older than 12 years. For children under 12 years the results of questionnaire's analysis were not so clear as for older pupils.
Źródło:
Acta Physica Polonica A; 2010, 118, 1; 115-117
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Interrelation of Microstructure and Corrosion Resistance in Biodegradable Magnesium Alloys with Aluminum, Lithium and Rare Earth Additions
Autorzy:
Minárik, P.
Landa, M.
Lesná, I.
Zemková, M.
Jablonská, E.
Hadzima, B.
Janeček, M.
Král, R.
Powiązania:
https://bibliotekanauki.pl/articles/1402061.pdf
Data publikacji:
2015-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.-t
82.45.Bb
87.85.J-
43.40.Le
Opis:
The influence of equal channel angular pressing and rotary swaging on the microstructure and corrosion resistance was investigated in three magnesium alloys with the addition of aluminum, lithium and rare earth elements - AE21, AE42 and LAE442. The processing resulted in grain refinement in all cases; nevertheless, the effect on the corrosion resistance was ambiguous. A continuous increase of the polarization resistance during the gradual equal channel angular pressing was observed in the AE42 and LAE442 alloys, whereas there was almost no effect in the AE21 alloy. The rotary swaging of AE42 resulted in a decrease of polarization resistance. The increase of polarization resistance in the alloys with the higher concentration of alloying elements was caused by the combined effect of grain refinement and better dispersion of particles in the matrix thanks to shear deformation during equal channel angular pressing. In the AE42 alloy, the increase of the corrosion resistance after equal channel angular pressing was also proven by chemical analysis of the solution and acoustic emission detection. This beneficial effect was not observed when the concentration of alloying elements was lower or when the deformation mode was different from shearing.
Źródło:
Acta Physica Polonica A; 2015, 128, 4; 491-496
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies