Temat: acoustic fields - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Experimental studies of low-frequency acoustic fields in a shallow sea
Autorzy:: Luchinin, A. G.
Powiązania:: https://bibliotekanauki.pl/articles/332794.pdf
Data publikacji:: 2009
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: experimental studies
acoustic fields
shallow sea
Opis:: The results of the studies of excitation and propagation of low-frequency acoustic fields in a shallow sea, which have been carried out at the IAP RAS for several years, are discussed. A novel equipment complex designed specially for these experiments and intended for the selective excitation and reception of waveguide modes is described. Examples of measurements of various characteristics of low-order mode acoustic signals are given, which demonstrate high efficiency of the applied equipment and measurement technique.
Źródło:: Hydroacoustics; 2009, 12; 117-126
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Acoustic environment analysers as tools for deaf persons helping
Autorzy:: Kulikowski, J. L.
Powiązania:: https://bibliotekanauki.pl/articles/333237.pdf
Data publikacji:: 2003
Wydawca:: Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
Tematy:: pomoc osobom niesłyszącym
pole akustyczne
akustyczna analiza sygnałów
interpretacja sygnałów akustycznych
akustyczny opis środowiska
helping deaf persons
acoustic fields
acoustic signals analysis
acoustic signals interpretation
acoustic environment description
Opis:: The paper presents a concept of acoustic field analyser as a tool for helping deaf people, able to perceive visual and⁄or tactile signals only. The acoustic field is considered as a sum of acoustic waves carrying information about events occurring in a monitored physical space. Recognition of acoustic signals together with identification of their sources give a possibility to recognise events of vital importance to a deaf person. There are presented here general problems of acoustic environment analysers' design, particular attention being paid to acoustic sources localisation in physical space.
Źródło:: Journal of Medical Informatics & Technologies; 2003, 5; MI3-12
1642-6037
Pojawia się w:: Journal of Medical Informatics & Technologies
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Multitone nonlinear coding
Autorzy:: Nowicki, A.
Wójcik, J.
Secomski, W.
Powiązania:: https://bibliotekanauki.pl/articles/331604.pdf
Data publikacji:: 2008
Wydawca:: Polskie Towarzystwo Akustyczne
Tematy:: MNC method
virtual fields
acoustic source
Opis:: A new method that utilizes nonlinear properties of tissue (or another media) to improve ultrasound image resolution is presented. In our novel method the acoustic source is activated with two tones burst (2.2 and 4.4 MHz) with specially designed polarization of the individual tone burst. This new approach is called multi tone nonlinear coding MNC because the choice of polarization of the both tones (and their amplitudes) allowing optimization of the receiving properties depends on the nonlinear properties of tissue. The calculations were done for two tones bursts propagating in the tissue-like lossy medium with absorption of 7 Np/mźMHz. The concept of the Virtual Fields was introduced to explain abilities and properties of pulse inversion and MNC method and to compare both. Comparison of the spatial field distribution obtained using MNC and conventional harmonic imaging approach, in which the first harmonic is used to reconstruct the image are presented.
Źródło:: Hydroacoustics; 2008, 11; 289-298
1642-1817
Pojawia się w:: Hydroacoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Mobile phone use and risk for intracranial tumors and salivary gland tumors – A meta-analysis
Autorzy:: Bortkiewicz, Alicja
Gadzicka, Elżbieta
Szymczak, Wiesław
Powiązania:: https://bibliotekanauki.pl/articles/2161927.pdf
Data publikacji:: 2017-02-21
Wydawca:: Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:: electromagnetic fields
brain tumors
acoustic neuroma
salivary gland tumors
cellular phone
case-control Studies
Opis:: Results of epidemiological studies on the association between use of mobile phone and brain cancer are ambiguous, as well as the results of 5 meta-analysis studies published to date. Since the last meta-analysis (2009), new case-control studies have been published, which theoretically could affect the conclusions on this relationship. Therefore, we decided to perform a new meta-analysis. We conducted a systematic review of multiple electronic data bases for relevant publications. The inclusion criteria were: original papers, case-control studies, published till the end of March 2014, measures of association (point estimates as odds ratio and confidence interval of the effect measured), data on individual exposure. Twenty four studies (26 846 cases, 50 013 controls) were included into the meta-analysis. A significantly higher risk of an intracranial tumor (all types) was noted for the period of mobile phone use over 10 years (odds ratio (OR) = 1.324, 95% confidence interval (CI): 1.028–1.704), and for the ipsilateral location (OR = 1.249, 95% CI: 1.022–1.526). The results support the hypothesis that long-term use of mobile phone increases risk of intracranial tumors, especially in the case of ipsilateral exposure. Further studies are needed to confirm this relationship. Int J Occup Med Environ Health 2017;30(1):27–43
Źródło:: International Journal of Occupational Medicine and Environmental Health; 2017, 30, 1; 27-43
1232-1087
1896-494X
Pojawia się w:: International Journal of Occupational Medicine and Environmental Health
Dostawca treści:: Biblioteka Nauki

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