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    Wyświetlanie 1-33 z 33
    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:
    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:
    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:
    A note on the predual of Lip(S, d)
    Autorzy:
    Johnson, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/723328.pdf
    Data publikacji:
    1979
    Wydawca:
    Polska Akademia Nauk. Instytut Matematyczny PAN
    Źródło:
    Colloquium Mathematicum; 1978-1979, 40, 2; 287-289
    0010-1354
    Pojawia się w:
    Colloquium Mathematicum
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    FOR THE RECORD: DEBATE ON THE MULTILINGUALITY OF RIAS
    Autorzy:
    Broncano, Manuel
    D’haen, Theo
    Johnson-Roullier, Cyraina
    Breinig, Helmbrecht
    Desmond, Jane
    Narita, Tatsushi
    Mariani, Giorgio
    Olsson, Anders
    Powiązania:
    https://bibliotekanauki.pl/articles/626434.pdf
    Data publikacji:
    2006
    Wydawca:
    Wydawnictwo Uniwersytetu Śląskiego
    Opis:
    TO BE ADDED
    Źródło:
    Review of International American Studies; 2006, 2, 2
    1991-2773
    Pojawia się w:
    Review of International American Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of two fracture models in impact simulations
    Autorzy:
    Fras, T.
    Roth, C. C.
    Mohr, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/200605.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    armour steel
    Lode angle parameter
    stress triaxiality
    Hosford-Coulomb model
    Johnson-Cook model
    Opis:
    The following discussion concerns modelling of fracture in steel plates during an impact test, in which both target and striker are manufactured from the same material, high-strength high-hardness armour steel – Mars® 300. The test conditions (3 mm thick targets, projectiles with different nose shapes at impact velocity lower than 400 m/s) result in severely damaged components, which results in an analysis of stress states showing material failure. Numerical analyses are performed using two material models: the Johnson-Cook approach, as traditionally used in impact simulations, accounting for the effect of stress triaxiality, strain rate and temperature and for comparison, a simulation by means of the stress triaxiality and Lode angle parameter-dependent Hosford-Coulomb model, also incorporating the effect of the strain rate on a fracture initiation. The aim of the study is to analyse the mechanisms of penetration and perforation observed in the armour steel plates and validation of the modelling approaches.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2020, 68, 2; 317-325
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Characterization and Constitutive Modelling of ARMSTAL 500 Steel
    Autorzy:
    Tria, D. E.
    Trębiński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/403943.pdf
    Data publikacji:
    2015
    Wydawca:
    Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
    Tematy:
    Johnson-Cook strength model
    damage models
    Split Hopkinson Pressure bar
    material tests
    LS DYNA Explicit
    Opis:
    The behaviour of a high strength steel (ARMSTAL 500) has been investigated using a combination of quasistatic and dynamic tests for a wide strain-rate range 1·10⁻⁴ – 3·10³ s⁻¹. A uniaxial testing machine and a Split Hopkinson Pressure Bar (SHPB) have been used under well controlled testing conditions. Next, the effect of the strain hardening, the strain rate hardening, loading history and stress triaxiality on the strength and ductility of the material has been studied. The present work also describes constitutive and damage models and their implementation available in the nonlinear finite element code LS DYNA. Calibration of constitutive model parameters and damage criteria is most often accomplished via regression techniques applied to laboratory data. A 3D numerical simulation of perforation of ARMSTAL 500 plates with 7.62 × 51 mm AP projectile were carried out with detailed models of target and compared with experiment in order to validate the calibrated models. As it will be shown, ARMSTAL 500 steel is a high strength steel with modest strain-rate sensitivity. The study indicates that the penetration depth can be predicted quantitatively and qualitatively with MJC hardening parameters calibrated from compression tests. The Modified Johnson–Cook constitutive model with Cockcroft and Latham failure model can predict the projectile residual speed and the fragmentation process followed very closely by MJC failure criteria.
    Źródło:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa; 2015, 6, 3 (21); 19-40
    2081-5891
    Pojawia się w:
    Problemy Mechatroniki : uzbrojenie, lotnictwo, inżynieria bezpieczeństwa
    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
    Tytuł:
    Entre illusion et réalité : le corps dans « Le Jeûne » et « La Mort d’un paysan » d’Émile Zola
    Pomiędzy iluzją a rzeczywistością: ciało w opowiadaniach „Le Jeûne” i „La Mort d’un Paysan” Emila Zoli
    Between Illusion and Reality: The Body in “Le Jeûne” and “La Mort d’un paysan” by Émile Zola
    Autorzy:
    Johnson, Warren
    Powiązania:
    https://bibliotekanauki.pl/articles/2056533.pdf
    Data publikacji:
    2022-05-30
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
    Tematy:
    Zola
    Le Nouveau Décaméron
    ciało
    iluzja
    realność
    idealizm
    body
    illusion
    reality
    idealism
    Opis:
    Cet article étudie les deux contes donnés par Émile Zola au Nouveau Décaméron, entreprise collective de Catulle Mendès. Ces contributions, « Le Jeûne » et « La Mort d’un paysan », forment deux volets d’une même interrogation sur le rapport entre le matériel et le spirituel, et entre la réalité physique du corps et l’esprit. Pour la baronne égoïste et frivole dans « Le Jeûne », l’éloquence du vicaire combinée avec la chaleur dans l’église lui donnent un plaisir sensuel qui va à l’encontre des semonces du prêtre. Par contraste, « La Mort d’un paysan » présente une perspective positive sur la vie rurale réglée par des rythmes naturels et la solidarité familiale, où la mort est acceptée comme faisant partie de la vie mais où l’illusion est bannie. Ces deux textes permettent à Zola de s’attaquer, depuis deux directions opposées, à un idéalisme mensonger et improductif.
    Niniejszy artykuł analizuje dwa opowiadania Emila Zoli, stanowiące jego wkład w Le Nouveau Décaméron, wieloautorskie przedsięwzięcie pod redakcją Catulle’a Mendèsa. Opowiadania „Le Jeûne” i „La Mort d’un paysan” można traktować jako dwie propozycje refleksji na wspólny temat – związku między sferą materialną i duchową, między wymiarem fizycznym ciała a jego wnętrzem. W „Le Jeûne” elokwencja wikariusza w połączeniu z ciepłą atmosferą we wnętrzu kościoła doprowadza frywolną i egoistyczną baronową do zmysłowej przyjemności, będącej zaprzeczeniem kazań duchownego. Na zasadzie kontrastu „La Mort d’un paysan” ukazuje pozytywny obraz życia wiejskiego, cechującego się naturalnym rytmem życia i ludzką solidarnością, w którym śmierć jest akceptowana jako naturalna kolej rzeczy, a wszelka iluzja odrzucana. Oba teksty pozwalają Zoli poddać ostrej krytyce z dwóch przeciwstawnych perspektyw zakłamany i bezproduktywny idealizm.
    This article studies the two tales conributed by Émile Zola to Le Nouveau Décaméron, the collective enterprise of Catulle Mendès. These contributions, “Le Jeûne” and “La Mort d’un paysan”, form two parts of the same questioning of the relationship between the material and the spiritual, and between the physical reality of the body and the mind. For the selfish and frivolous Baroness in “Le Jeûne,” the eloquence of the vicar combined with the warmth in the church give her a sensual pleasure that goes against the warnings of the priest. In contrast, “La Mort d’un paysan” presents a positive perspective on rural life regulated by natural rhythms and family solidarity, where death is accepted as a part of life, but illusion is banished. These two texts allow Zola to attack, from opposite directions, a false and unproductive idealism.
    Źródło:
    Roczniki Humanistyczne; 2022, 70, 5; 51-61
    0035-7707
    Pojawia się w:
    Roczniki Humanistyczne
    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:
    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:
    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:
    Fe 3d Contribution to the Valence Band of Cubic Hg$\text{}_{1-x}$Fe$\text{}_{x}$S - Resonant Photoemission Study
    Autorzy:
    Kowalski, B. J.
    Orłowski, B. A.
    Szuszkiewicz, W.
    Witkowska, B.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933837.pdf
    Data publikacji:
    1995-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    Opis:
    Resonant photoemission spectra of cubic Ηg$\text{}_{0.94}$Fe$\text{}_{0.06}$S were measured for photon energies near to the energy of intra atomic Fe 3p$\text{}^{6}$3d$\text{}^{6}$ → 3p$\text{}^{5}$3d$\text{}^{7}$ transition. The difference between the spectra taken at resonance and antiresonance is presented as a measure of the energy distribution of Fe 3d derived states. The results obtained show that Fe 3d states contribute to the whole valence band with a distinct structure appearing at the band edge.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 4; 791-794
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Yb on Valence Band Density of States of CdYbTe and PbYbTe - a Resonant Photoemission Study
    Autorzy:
    Szamota-Sadowska, K.
    Kowalski, B. J.
    Guziewicz, E.
    Orłowski, B. A.
    Sadowski, J.
    Gołacki, Z.
    Ghijsen, J.
    Johnson, R. L.
    Belkhou, R.
    Radosavkič, D.
    Martinotti, D.
    Barrett, N.
    Guillot, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952185.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.Vv
    Opis:
    Photoemission measurements using synchrotron radiation were performed on PbYbTe (bulk crystal) and CdYbTe (MBE thin film). The resonant enhancement of the photoemission was applied for investigation of the contribution of Yb 4f electrons to the valence band. The set of the energy distribution curves was collected for energies in the region close to the 4d-4f Fano transition. The Yb 4f$\text{}^{14}$ were observed at the binding energies close to the edge of the valence band while the 4f$\text{}^{13}$ states were revealed deep in the valence band.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 943-946
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gd 4f and 5d Electrons in Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te Valence Band
    Autorzy:
    Orłowski, B. A.
    Kowalski, B. J.
    Gołacki, Z.
    Story, T.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1933933.pdf
    Data publikacji:
    1995-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Fi
    Opis:
    The synchrotron radiation was applied to measure resonant photoemission spectra (Fano-type Gd 4d-4f resonance), constant initial states and constant final states to study the valence band electronic structure of Sn$\text{}_{0.96}$Gd$\text{}_{0.04}$Te crystal. The resonant energy was found equal to 150.3 eV. The electrons 4f were found to contribute to the valence band of the crystal with the maximum located at 9.5 eV below the valence band edge whereas 5d electrons contribute at the crystal valence band edge.
    Źródło:
    Acta Physica Polonica A; 1995, 88, 5; 857-860
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ochrona przed przeciążeniami + 12 Gz
    Autorzy:
    Ivan, D. J.
    Stern, C. H.
    Patterson, J. C.
    Johnson, P. C.
    Drew, W. E.
    Yates, J. T.
    Burns, J. W.
    Powiązania:
    Polski Przegląd Medycyny Lotniczej 2001, nr 4, s. 369-388
    Współwytwórcy:
    Domin, Artur. Tłumaczenie
    Data publikacji:
    2001
    Tematy:
    Medycyna wojskowa lotnicza
    Przeciążenie (lot.) badania
    Piloci przeciążenie badania
    Opis:
    Rys., tab.; Bibliogr.; Sum.; Tł. art. zamieszcz. w "Aviation Space, and Environmental Medicine". --- May 2001, s. 413-421.
    Dostawca treści:
    Bibliografia CBW
    Artykuł
    Tytuł:
    Contribution of Mn 3d Electrons To the Valence Band of Sn$\text{}_{0.9}$Mn$\text{}_{0.1}$te
    Autorzy:
    Nadolny, A. J.
    Guziewicz, E.
    Kowalski, B. J.
    Orłowski, B. A.
    Johnson, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1992049.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Nr
    Opis:
    The synchrotron radiation in the energy range between 15 and 70 eV was used to investigate the electronic structure of the crystalline Sn$\text{}_{0.9}$Mn$\text{}_{0.1}$Te by means of the resonant photoemission spectroscopy. Fano-type resonance has been observed in the obtained constant initial energy curves with the resonant energy 50.6 eV and antiresonant energy 49.0 eV. The energy distribution curves taken at photon energies close to the Mn 3p-3d transitions allow us to conclude that Mn atoms contribute to the valence band mainly at energies of 4.0 eV and 7.8 eV below the valence band edge.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 454-458
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoemission Study of Mn 3d Electrons in the Valence Band of Mn/GeMnTe
    Autorzy:
    Pietrzyk, M. A.
    Kowalski, B. J.
    Orłowski, B. A.
    Knoff, W.
    Osinniy, V.
    Kowalik, I. A.
    Story, T.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2047678.pdf
    Data publikacji:
    2007-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    71.20.Mq
    Opis:
    We present the results of the electronic band structure study of Ge$\text{}_{0.9}$Mn$\text{}_{0.1}$Te epilayers, clean and modified in situ by deposition of manganese atoms. The sets of resonant photoemission spectra were measured for the photon energy range covering the energy of Mn 3p→3d transition (45
    Źródło:
    Acta Physica Polonica A; 2007, 112, 2; 275-281
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Valence Band Density of States and Mn 3d Contribution in Mn$\text{}_{1-x}$Mg$\text{}_{x}$Te
    Autorzy:
    Kowalski, B. J.
    Guziewicz, E.
    Kopalko, K.
    Orłowski, B. A.
    Janik, E.
    Wojtowicz, T.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991616.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Nr
    79.60.-i
    Opis:
    Resonant photoemission spectroscopy was applied to determine the Mn 3d derived contribution to the valence band density of states of Mn$\text{}_{0.44}$ Mg$\text{}_{0.56}$Te grown by molecular beam epitaxy on a GaAs(001) substrate. The modifications of the valence band density-of-states distribution are discussed as a consequence of the substitution of Mg ions for Mn ions.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 401-405
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cr 3d Surface and Bulk States in Sn$\text{}_{1-x}$Cr$\text{}_{x}$Te/Cr Crystals
    Autorzy:
    Guziewicz, E.
    Szamota-Sadowska, K.
    Kowalski, B. J.
    Grodzicka, E.
    Story, T.
    Orłowski, B. A.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1963380.pdf
    Data publikacji:
    1997-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Fx
    79.60.-i
    Opis:
    We report a new approach to investigate metal-semiconductor interface formation. Photoemission spectroscopy was applied in order to investigate the clean surface of a Sn$\text{}_{0.97}$Cr$\text{}_{0.03}$ Te crystal and to observe its changes under sequential deposition of small amounts of Cr atoms. In order to analyse the Cr 3d contribution to the valence band, the Fano-type resonance tuned to the Cr 3p-3d transition was used. The experiment was designed to follow the Sn$\text{}_{0.97}$Cr$\text{}_{0.03}$ Te/Cr interface formation process. At the clean Sn$\text{}_{0.97}$Cr$\text{}_{0.03}$Te surface, the Cr 3d states contribution to the valence band was found to be positioned 0.8 eV below the Fermi level. After the Cr deposition processes the contribution shifted to a higher binding energy and another contribution 5.8 eV below the Fermi level was also observed.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 4; 783-787
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Resonant Photoemission Study of Mn 3d Electrons Contribution to the Pb$\text{}_{0.92}$Mn$\text{}_{0.08}$Se Valence Band
    Autorzy:
    Orłowski, B. A.
    Kowalski, B. J.
    Le Van, Khoi
    Gałązka, R. R.
    Ghijsen, J.
    Johnson, R. L.
    Powiązania:
    https://bibliotekanauki.pl/articles/1872563.pdf
    Data publikacji:
    1995-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.20.Fi
    79.60.-i
    Opis:
    The resonant photoemission spectroscopy was applied to investigate the valence band electronic structure of semimagnetic semiconductor Pb$\text{}_{0.92}$Mn$\text{}_{0.08}$Se crystal and to determine the contribution of Mn 3d electrons to the valence band. The set of energy distribution curves and constant initial states spectra were taken for by energies in the region (40-60 eV) close to the Mn 3p-3d transition. The electrons Mn 3d hybridize and contribute to the valence band electrons of the crystal and main density of states contribution appears in the energy 3.5 ± 0.2 eV below the valence band edge.
    Źródło:
    Acta Physica Polonica A; 1995, 87, 2; 329-332
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Femtosecond X-ray Absorption Spectroscopy οf a Light-Driven Spin-Crossover Process
    Autorzy:
    Milne, C.
    Pham, V.
    Gawelda, W.
    Nahhas, A.
    van der Veen, R.
    Johnson, S.
    Beaud, P.
    Ingold, G.
    Borca, C.
    Grolimund, D.
    Abela, R.
    Chergui, M.
    Bressler, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/1539083.pdf
    Data publikacji:
    2010-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.70.Dm
    75.30.Wx
    Opis:
    Understanding the initial steps during ultrafast molecular reactions involving large spin state changes is a vital goal in structural dynamics research. These involve knowledge of the geometric structure of the system. Ultrafast X-ray absorption spectroscopy with 50-100 picosecond time resolution establishes the geometric structure of the short-lived (τ = 0.6 ns) high spin state. Here we focus on time-resolved X-ray absorption studies with 160-200 fs temporal resolution to monitor the structural evolution in this spin-conversion process.
    Źródło:
    Acta Physica Polonica A; 2010, 117, 2; 391-393
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modeling morphological learning, typology, and change : What can the neural sequence-to-sequence framework contribute?
    Autorzy:
    Elsner, Micha
    Sims, Andrea D.
    Erdmann, Alexander
    Hernandez, Antonio
    Jaffe, Evan
    Jin, Lifeng
    Booker Johnson, Martha
    Karim, Shuan
    King, David L.
    Lamberti Nunes, Luana
    Oh, Byung-Doh
    Rasmussen, Nathan
    Shain, Cory
    Antetomaso, Stephanie
    Dickinson, Kendra V.
    Diewald, Noah
    McKenzie, Michelle
    Stevens-Guille, Symon
    Powiązania:
    https://bibliotekanauki.pl/articles/103835.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Instytut Podstaw Informatyki PAN
    Tematy:
    morphology
    computational modeling
    typology
    Opis:
    We survey research using neural sequence-to-sequence models as computational models of morphological learning and learnability. We discuss their use in determining the predictability of inflectional exponents, in making predictions about language acquisition and in modeling language change. Finally, we make some proposals for future work in these areas.
    Źródło:
    Journal of Language Modelling; 2019, 7, 1; 53-98
    2299-856X
    2299-8470
    Pojawia się w:
    Journal of Language Modelling
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-33 z 33

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