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Tytuł:
The mystery of Mystriosaurus: Redescribing the poorly known Early Jurassic teleosauroid thalattosuchians Mystriosaurus laurillardi and Steneosaurus brevior
Autorzy:
Sachs, S.
Johnson, M.M.
Young, M.T.
Abel, P.
Powiązania:
https://bibliotekanauki.pl/articles/20267.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
The genus Mystriosaurus, established by Kaup in 1834, was one of the first thalattosuchian genera to be named. The holotype, an incomplete skull from the lower Toarcian Posidonienschiefer Formation of Altdorf (Bavaria, southern Germany), is poorly known with a convoluted taxonomic history. For the past 60 years, Mystriosaurus has been considered a subjective junior synonym of Steneosaurus. However, our reassessment of the Mystriosaurus laurillardi holotype demonstrates that it is a distinct and valid taxon. Moreover, we find the holotype of “Steneosaurus” brevior, an almost complete skull from the lower Toarcian Whitby Mudstone Formation of Whitby (Yorkshire, UK), to be a subjective junior synonym of M. laurillardi. Mystriosaurus is diagnosed in having: a heavily and extensively ornamented skull; large and numerous neurovascular foramina on the premaxillae, maxillae and dentaries; anteriorly oriented external nares; and four teeth per premaxilla. Our phylogenetic analyses reveal M. laurillardi to be distantly related to Steneosaurus bollensis, supporting our contention that they are different taxa. Interestingly, our analyses hint that Mystriosaurus may be more closely related to the Chinese teleosauroid (previously known as Peipehsuchus) than any European form.
Źródło:
Acta Palaeontologica Polonica; 2019, 64, 3
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chaotic Time-Reversed Acoustics: Sensitivity οf the Loschmidt Echo to Perturbations
Autorzy:
Taddese, B.
Johnson, M.
Hart, J.
Antonsen, T.
Ott, E.
Anlage, S.
Powiązania:
https://bibliotekanauki.pl/articles/1585110.pdf
Data publikacji:
2009-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
03.55.Kk
05.45.Mt
43.58.+z
43.60.+d
Opis:
We experimentally demonstrate a new acoustic sensor based on the concept of quantum mechanical scattering fidelity and the Loschmidt echo applied to classical acoustic waves in air. The sensor employs a one-recording-channel time-reversal mirror that exploits spatial reciprocity to sensitively measure the classical analog of the scattering fidelity of an enclosed region. The experiments are carried out in a stairwell using a simple speaker and microphone. The input is a 7.0 kHz signal that is amplitude modulated with a 1 ms long pulse. We examine the sensitivity of the time-reversed reconstructed pulse to phase noise, long term drift, and to typical perturbations caused by the rotation of an object in the scattering environment.
Źródło:
Acta Physica Polonica A; 2009, 116, 5; 729-732
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Indigenous Fisherman Divers of Thailand: Diving-Related Mortality and Morbidity
Autorzy:
Gold, D.
Geater, A.
Aiyarak, S.
Wongcharoenyong, S.
Juengprasert, W.
Johnson, M.
Skinner, P.
Powiązania:
https://bibliotekanauki.pl/articles/90406.pdf
Data publikacji:
2000
Wydawca:
Centralny Instytut Ochrony Pracy
Tematy:
indigenous divers
Thailand
mortality
decompression illness
nurkowanie
Tajlandia
choroba dekompresyjna
Opis:
The Urak Lawoi are indigenous fishermen on Thailand’s west coast. The population includes an estimated 400 divers who dive using surface-supplied compressed air. In a cross-sectional survey conducted among the 6 major communities of Urak Lawoi, questionnaire-based interviews were administered to active divers, ex-divers, and families or colleagues of divers who had died in the previous 5 years. Six deaths resulting from diving-related accidents were identified, indicating a diving-related mortality rate of approximately 300 per 100,000 person-years, while in the same 5-year period 11 divers had been disabled owing to diving-related events, indicating a diving-related disabling event rate of approximately 550 per 100,000 person-years. Among 342 active divers interviewed, one third reported having suffered from decompression illness, although based on reported current symptoms over 50% were classified as suffering from recurring non-disabling decompression illness. Physical examination conducted on a subset of 98 active divers revealed the presence of spinal injury (clonus, raised muscle tone, and heightened reflexes) and of joint damage (pain in one or more joint, crepitus, or restricted movement) in 24 and 30% respectively. Improved primary prevention and medical treatment are needed to reduce mortality and morbidity among this population.
Źródło:
International Journal of Occupational Safety and Ergonomics; 2000, 6, 2; 147-167
1080-3548
Pojawia się w:
International Journal of Occupational Safety and Ergonomics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Light Scattering Investigations of Magnetic Anisotropies in Ultrathin Epitaxial Co Films
Autorzy:
Hillebrands, B.
Krams, P.
Fassbender, J.
Mathieu, C.
Güntherodt, G.
Jungblut, R.
Johnson, M. T.
Powiązania:
https://bibliotekanauki.pl/articles/1861065.pdf
Data publikacji:
1994-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.30.Gw
75.30.Pd
75.30.Ds
78.35.+c
Opis:
Using Brillouin light scattering, the properties of magnetic anisotropies in ultrathin epitaxial Co films grown on single-crystal Cu substrates are investigated. All relevant magnetic anisotropy contributions are determined, in situ in an ultrahigh vacuum system for the (001)-oriented films, as well as ex situ for other film orientations, which are covered with a Cu cap layer. For (001)-oriented films we find a large in-plane anisotropy contribution of fourfold symmetry. For this contribution the volume and the surface part cancel to zero at the same thickness as found for the onset of ferromagnetic order. This finding is indicative for a stabilization of ferromagnetic order in Co/Cu(001) by in-plane anisotropy contributions. In (1 1 13)-oriented films, which are composed of (001)-terraces aligned along the [11̅0]-direction and spaced by 6.5 atomic distances, an additional uniaxial in-plane anisotropy contribution is found which is identified as being of magneto-elastic origin. For (110)-oriented films three ranges of thickness dependence of the in-plane and out-of-plane anisotropy contributions are found which correlate in the thin-film regime with the growth properties. (111)-oriented films show a linear dependence of the perpendicular anisotropy on the reciprocal film thickness over the full investigated thickness range of 2 to 20 Å.
Źródło:
Acta Physica Polonica A; 1994, 85, 1; 179-193
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defects and Defect Reactions in Semiconductor Nitrides
Autorzy:
Van de Walle, C. G.
Neugebauer, J.
Stampfl, C.
McCluskey, M. D.
Johnson, N. M.
Powiązania:
https://bibliotekanauki.pl/articles/2011140.pdf
Data publikacji:
1999-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Bb
61.72.Ji
61.82.Fk
71.55.Eq
Opis:
We report a comprehensive investigation of native point defects and impurities in GaN, AlN, and AlGaN alloys, with the goal of understanding doping limitations in nitride semiconductors. Unintentional incorporation of impurities (mainly oxygen) explains the tendency of nitride semiconductors to exhibit n-type conductivity. Silicon is the n-type dopant of choice; it remains shallow in AlGaN up to high Al content, while oxygen undergoes a DX transition. Experimental evidence for DX centers will be discussed. In p-type material, Mg doping is hindered by an increase in ionization energy with increasing Al content in AlGaN, and by nitrogen vacancies acting as compensating centers. Complex formation between magnesium and oxygen and between magnesium and nitrogen vacancies will be discussed.
Źródło:
Acta Physica Polonica A; 1999, 96, 5; 613-627
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Extension of operators from weak*-closed sub-spaces of $l_1$ into C(K) spaces
Autorzy:
B. Johnson, W.
Zippin, M.
Powiązania:
https://bibliotekanauki.pl/articles/1288537.pdf
Data publikacji:
1994-12-16
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Opis:
It is proved that every operator from a weak*-closed subspace of $ℓ_1$ into a space C(K) of continuous functions on a compact Hausdorff space K can be extended to an operator from $ℓ_1$ to C(K).
Źródło:
Studia Mathematica; 1995-1996, 117, 1; 43-55
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Overview of the Canadian Health Care System
Autorzy:
Bielska, Iwona A.
Hampel, Elizabeth M.
Johnson, Ana P.
Powiązania:
https://bibliotekanauki.pl/articles/635288.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
Canada
delivery of health care
economics
financing
health services
ekonomika zdrowia
finansowanie
Kanada
świadczenie usług zdrowotnych
usługi zdrowotne
Opis:
The Canadian health care system is a publicly financed system administered by ten provincial and three territorial governments. The purpose of this article is to provide an overview of the universal health care system in Canada, including its history, the health status of Canadians, health care funding and spending, and health research and data collection. Health care spending in Canada amounts to 11.6% of the country’s gross domestic product and is estimated to have been $200.5 billion Canadian dollars in 2011. Hospitals account for the largest source of health care spending (29%), followed by drugs (16%) and physician spending (14%). Of the total health care spending, 70% is paid for by the public system. Due to the Canadian population being covered by the universal health care system, health data are being collected and can be used to monitor the health care system and inform evidence-based medicine.
Źródło:
Zdrowie Publiczne i Zarządzanie; 2012, 10, 1; 51-56
2084-2627
Pojawia się w:
Zdrowie Publiczne i Zarządzanie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 20

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