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Tytuł:
Orthacanthus platypternus (Cope, 1883) (Chondrichthyes: Xenacanthiformes) teeth and other isolated vertebrate remains from a single horizon in the early Permian (Artinskian) Craddock Bonebed, lower Clear Fork Group, Baylor County, Texas, USA
Autorzy:
Johnson, G. D.
Powiązania:
https://bibliotekanauki.pl/articles/138953.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Orthacanthus platypternus
early Permian
Craddock Bonebed
Texas
ryby chrzęstnoszkieletowe
ryby chrzęstne
chrzęstniki
Chondrichthyes
wczesny perm
Teksas
Opis:
An unusual 6–8 cm layer of prismatic cartilage and matrix containing some 8,800 teeth, coprolites, incomplete occipital spines, and denticles of Orthacanthus platypternus (Cope, 1883) occurs in the lower Permian (Artinskian) Craddock Bonebed in Texas, USA. It is the only species of shark present in the Clear Fork Group except for three worn Xenacanthus Beyrich, 1848 occipital spine fragments and two teeth of ?Lissodus (Polyacrodus) zideki (Johnson, 1981) (Hybodontoidei), both being the first occurrences in this unit. Analysis of measurements of teeth with complete bases randomly selected from 3,050 initially available teeth failed to reveal the presence of sexual dimorphism or the discrete presence of juveniles as expected, based on an independent study which identified the presence of Orthacanthus juvenile occipital spines. A few highly symmetrical small teeth are present, which had not been previously observed in the Texas lower Permian. They may be symphyseals and restricted only to juveniles. Other unusual teeth include germinal teeth and deformed teeth, both of which occur in the Clear Fork and underlying Wichita groups. One tooth displays an apparent example of the equivalent of an “enamel pearl” on one of its cusps. The most unusual teeth are those that appear to have undergone various stages of resorption. Only the lingual margin of the base is affected in which the apical button is resorbed to varying degrees until only the labial margin with the basal tubercle and the three cusps are all that remain. If the teeth were undergoing resorption, then the perplexing problem is why the apical button is resorbed and not the superjacent basal tubercle. Other vertebrate remains include palaeoniscoid scales and teeth and unidentified tetrapod bone fragments, jaw fragments, and teeth. Rare fragments of bones (scales?) bear a “comb edge” which have not been previously observed in the Texas lower Permian.
Źródło:
Acta Geologica Polonica; 2018, 68, 3; 421-436
0001-5709
Pojawia się w:
Acta Geologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Early Pennsylvanian xenacanth chondrichthyans from the Swisshelm Mountains, Arizona, USA
Autorzy:
Johnson, G.D.
Thayer, D.W.
Powiązania:
https://bibliotekanauki.pl/articles/21790.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
vertebrate
fauna
xenacanth chondrichthyan
chondrichthyan
Swisshelm Mountains
Arizona
USA
Chondrichthyes
Xenacanthiformes
Bransonelliformes
Orthacanthus
Triodus
Bransonella
Opis:
Three genera of xenacanths, based on isolated teeth, occur in the lepospondyl (amphibian)−dominated fauna from the upper Black Prince Limestone (late Bashkirian). Orthacanthus donnelljohnsi sp. nov. teeth, with carinae lacking serrations on the compressed principal cusps, and only one intermediate cusp, represent both adult and juvenile teeth. Heterodonty occurs in both adult and juvenile dentitions. The absence of serrations is unique among Pennsylvanian species of Orthacanthus. Teeth with often highly asymmetrical bases with an aborally−flexed lingual marginal flange (= anterolingual shelf) and a single intermediate cusp are assigned to Triodus elpia sp. nov. A central foramen occurs in the base, unlike most other species; the moderately compressed principal cusps bear generally straight cristae. They represent the first reported occurrence of Triodus in the Paleozoic of North America. Five teeth, with cristae extending from the cusps onto their bases, belong to Bransonella. Two are questionably assigned to Bransonella nebraskensis, one to B. ?lingulata with its labio−lingually elongated apical button and smaller than normal intermediate cusp, and one each to Bransonella sp. “A” and “B”. Bransonella sp. “A” has a base wider (labio−lingual) than long, the reverse of the other Bransonella teeth. Bransonella sp. “B” is distinctly different, as it lacks an intermediate cusp (as in some B. lingulata teeth), and the basal tubercle is beneath one of the cusps (with no evidence of deformity).
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 4
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and preliminary testing of a culturally-friendly pain assessment tool for children (Crying Faces Pain Scale)
Opracowanie i wstępne badania nad przyjaznym kulturowo narzędziem do oszacowania bólu u dzieci − Skala Bólu wg Wizerunków Płaczących Twarzy (Crying Faces Pain Scale)
Autorzy:
Mbada (Ph.D.), Chidozie E
Orimolade (FMCS), Ayodele E
Falujo (BMR – PT), Omoseye C
Oladiran (FWACS), Ajibola B
Omole (M.Sc), John O
Johnson (Ph.D.), Olubusola E
Oziegbe (FMCDS), Elizabeth O
Adebambo (M.Sc), Atilola O
Omole (FWACP), Kehinde O
Powiązania:
https://bibliotekanauki.pl/articles/1790859.pdf
Data publikacji:
2019-02-09
Wydawca:
Akademia Wychowania Fizycznego im. Bronisława Czecha w Krakowie
Tematy:
Pain
Crying
Children
Nigeria
ból
płacz
dzieci
Opis:
Having a universal tool for assessing pain in children is hamstrung by cultural sensitivity. This study aimed to develop and validate a culturally-friendly pain assessment tool (i.e. Crying Faces Pain Scale (CFPS)) among Nigerian Children. This study employed criterion-standard design. The study was in three phases, namely: (1) development of CFPS, (2) cross-validity and (3) validation of the CFPS. 70 children (39 (55.7%) males and 31 (44.3%) females) within the age range of 4-13 years who had post-surgical pain, orthopaedic pain, stomach pain or headache were involved in the validation phase. Psychometric properties and preferences for the CFPS compared with the Wong-Baker FACES Pain Rating Scale (FACES) were examined. Descriptive and inferential statistics were used to analyze the data. Alpha level was set at p<0.05. The median score of the CFPS was 4.60 compared to FACES median score of 4.49. There was weak correlation between FACES and CFPS (r=0.325; p=0.006). Preference score as a culturally friendly tool for CFPS and FACES was 6.07±1.23 and 3.67±1.09 respectively, based on a modified 0-10 numerical pain scale. Conclusions: The crying faces pain scale has fair psychometric properties for assessing pain in children. However, CFPS was preferred to FACES as a culturally friendly tool for assessing pain among Nigerian children. Implications: The CFPS is more culturally friendly and so might be better suited as a pain scale in Africa. However, due to its fair psychometric properties, further studies may be needed to improve upon this scale.
Podstawy i cele: Posiadanie uniwersalnego narzędzia do oceny bólu u dzieci jest utrudnione przez wrażliwość kulturową. Badanie to miało na celu opracowanie i walidację przyjaznego kulturowo narzędzia do oceny bólu u dzieci tj. Skali Bólu wg Wizerunków Płaczących Twarzy (Crying Faces Pain Scale, CFPS) wśród nigeryjskich dzieci. Metody: W badaniu tym zastosowano standard wzorcowy. Badanie odbyło się w 3 fazach, mianowicie: 1) opracowanie CFPS, 2) walidacja krzyżowa oraz 3) walidacja CFPS. W fazie walidacji wzięło udział 70 dzieci, (39 (55.7%) chłopców i 31 (44.3%) dziewcząt) w przedziale wiekowym 4-13 lat, cierpiących na ból pooperacyjny, ból ortopedyczny, ból brzucha czy ból głowy. Zbadano właściwości psychometryczne i preferencje dla CFPS, w porównaniu z Graficzną Skalą Oceny Bólu Wonga-Bakera (FACES, Wong-Baker Faces Pain Rating Scale). Do analizy danych wykorzystano statystyki opisowe i inferencyjne. Poziom Alpha ustawiono na p<0.05. Wyniki: Średni wynik dla CFPS wyniósł 4,60, w porównaniu do średniego wyniku FACES wynoszącego 4,49. Wystąpiła słaba korelacja pomiędzy FACES a CFPS (r=0,325; p=0,.006). Preferowany wynik dla kulturowo przyjaznego narzędzia dla CFPS i FACES wyniósł odpowiednio 6,07 ±1,23 i 3,67 ±1,09, na podstawie zmodyfikowanej liczbowej skali bólu 0-10. Wnioski: Skala CFPS ma wystarczające właściwości psychometryczne do szacowania bólu u dzieci. Jednak preferowano bardziej CFPS niż FACES, jako bardziej przyjazne kulturowo narzędzie do oceny bólu wśród dzieci w Nigerii. Implikacje: CFPS jest bardziej przyjazny kulturowo i dlatego mógłby być bardziej odpowiedni, jako skala bólu w Afryce. Jednak, ze względu na swoje właściwości psychometryczne, potrzebne będą dalsze badania w celu poprawy tej skali.
Źródło:
Medical Rehabilitation; 2018, 22(3); 4-10
1427-9622
1896-3250
Pojawia się w:
Medical Rehabilitation
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The maximal normal subspace of the inverse image of a normal space of sequences by a non-negative matrix transformation
Autorzy:
Johnson Jr., P. D.
Mohapatra, R. N.
Powiązania:
https://bibliotekanauki.pl/articles/714395.pdf
Data publikacji:
1985
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Źródło:
Annales Polonici Mathematici; 1985, 45, 2; 105-120
0066-2216
Pojawia się w:
Annales Polonici Mathematici
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Premixed combustion of acetylene-hydrogen fuel mixtures for thermodynamic state generation in a constant volume combustion vessel
Autorzy:
Johnson, S.
Nesbitt, J.
Lee, S. -Y.
Naber, J. D.
Powiązania:
https://bibliotekanauki.pl/articles/242374.pdf
Data publikacji:
2009
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
combustion engine
diesel engine
combustion processes
pressure vessel
preborn
Opis:
Flammability limits and flame speeds of dilute-lean fuel mixtures of hydrogen (H2) and acetylem premixed with oxygen (02) and nitrogen (N2) were examined with a detailed kinetics model. These mixtures are used in a preburn in a constant volume combustion vessel to create elevated temperatures and pressures with gas compositions that represent the thermodynamic state in a diesel engine combustion chamber at fuel injection and auto ignition. A mixture of hydrogen and acetylene with combined atomic hydrogen to carbon ratio (HCR) of 1.85 was used to match that of typical diesel fuel and results are shown in comparison to a previously used mixture with a HCR of 1.17. The lower flammability limit (LFL) of the HCR 1.85 fuel mixture was found at an equivalence ratio of 0.235, while flame speed and adiabatic combustion temperatures were also predicted for post preburn product oxygen levels between O and 21 percent. Flame speeds were shown to decrease with a reduction in oxygen concentration, an increase in nitrogen dilution, while combustion temperatures increased over most of this range. Trends for this relation of flame speed and temperature are presented and a new premixed fuel mixture with an HCR of 1.85 is proposed.
Źródło:
Journal of KONES; 2009, 16, 2; 199-208
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
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:
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:
Adaptive Learning: Context and Complexity
Autorzy:
Dziuban, Charles
Howlin, Colm
Dr. Moskal, Patsy D.
Dr. Johnson, Connie
Eid, Mitchell
Kmetz, Brandon
Powiązania:
https://bibliotekanauki.pl/articles/426270.pdf
Data publikacji:
2018
Wydawca:
Szkoła Główna Handlowa w Warszawie
Tematy:
online courses
academic achievement
adaptive learning
blended learning
digital learning
college students
educational strategies
Opis:
Adaptive learning technologies impact higher education by modifying the traditional time constraints placed on the learning cycle, thus permitting students to compress or expand their learning spaces. Previous work by the authors has demonstrated dimensional stability in the adaptive process across universities with considerably different strategic initiatives. However, a prevailing question remains about the correspondence of student position on those components. Transformed component scores for the four stable dimensions (knowledge acquisition, engagement, growth and communication) have been contrasted for comparability in beginning Algebra, College Algebra and Nursing courses at the University of Central Florida and the Colorado Technical University on several metrics generated by the Realizeit adaptive learning platform. The results indicated considerable variability in student affinity for the underlying dimensions depending on a number of considerations such as course length, subject area, and the instructional design process. The authors have concluded that adaptive learning is a complex system in which the interaction of the elements becomes more important than individual measures for understanding the emergent property of this learning environment. Finally, they contend that the potential value added of adaptive learning must be carefully considered with respect to its opportunity cost.
Źródło:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie; 2018, 5 (77); 13-23
1731-6758
1731-7428
Pojawia się w:
e-mentor. Czasopismo naukowe Szkoły Głównej Handlowej w Warszawie
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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