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Wyświetlanie 1-15 z 33
Tytuł:
Towards Attosecond Pulses with High Harmonics
Autorzy:
Agostini, P.
Paul, P. M.
Breger, P.
Toma, E. S.
Muller, H. G.
Mullot, G.
Augé, F.
Balcou, Ph.
Powiązania:
https://bibliotekanauki.pl/articles/2030463.pdf
Data publikacji:
2002-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Re
42.65.Ky
32.80.Rm
33.60.Cv
Opis:
The high harmonics produced by focusing an intense femtosecond laser in a gas are theoretically shown to be locked in phase. The physics of this locking is discussed and a new method based on quantum interference in two-photon, two-color ionization allowing to retrieve the relative phase of harmonic pairs is described. The main result is that the 5 harmonics of orders 11-19 produced in argon generate a train of subfemtosecond pulses with a period of 1.35 fs and a duration of 250 attoseconds.
Źródło:
Acta Physica Polonica A; 2002, 101, 3; 313-324
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microbial degradation of lignocellulosic biomass: discovery of novel natural lignocellulolytic bacteria
Autorzy:
Ahmed, S.
Rahman, S.
Hasan, M.
Paul, N.
Sajib, A.A.
Powiązania:
https://bibliotekanauki.pl/articles/81125.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
lignocellulose
microbial degradation
biofuel
cellulose
lignin
hemicellulose
lignocellulolytic bacteria
Chryseobacterium gleum
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2018, 99, 2
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The sixth sense in mammalian forerunners: variability of the parietal foramen and the evolution of the pineal eye in South African Permo-Triassic eutheriodont therapsids
Autorzy:
BENOIT, JULIEN
ABDALA, FERNANDO
MANGER, PAUL R.
RUBIDGE, BRUCE S.
Powiązania:
https://bibliotekanauki.pl/articles/945457.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
therapsida
pineal
parietal foramen
third eye
endothermy
permian
triassic
south africa
Opis:
In some extant ectotherms, the third eye (or pineal eye) is a photosensitive organ located in the parietal foramen on the midline of the skull roof. The pineal eye sends information regarding exposure to sunlight to the pineal complex, a region of the brain devoted to the regulation of body temperature, reproductive synchrony, and biological rhythms. The parietal foramen is absent in mammals but present in most of the closest extinct relatives of mammals, the Therapsida. A broad ranging survey of the occurrence and size of the parietal foramen in different South African therapsid taxa demonstrates that through time the parietal foramen tends, in a convergent manner, to become smaller and is absent more frequently in eutherocephalians (Akidnognathiidae, Whaitsiidae, and Baurioidea) and non-mammaliaform eucynodonts. Among the latter, the Probainognathia, the lineage leading to mammaliaforms, are the only one to achieve the complete loss of the parietal foramen. These results suggest a gradual and convergent loss of the photoreceptive function of the pineal organ and degeneration of the third eye. Given the role of the pineal organ to achieve fine-tuned thermoregulation in ectotherms (i.e., “cold-blooded” vertebrates), the gradual loss of the parietal foramen through time in the Karoo stratigraphic succession may be correlated with the transition from a mesothermic metabolism to a high metabolic rate (endothermy) in mammalian ancestry. The appearance in the eye of melanopsin-containing retinal ganglion cells replacing the photoreceptive role of the pineal eye could also have accompanied its loss.
Źródło:
Acta Palaeontologica Polonica; 2016, 61, 4; 777-789
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Etymology of Latin nimbus (and its Iranian Cognates)
L‘étymologie du latin nimbus (et ses cognacs iraniens)
Autorzy:
Cohen, Paul S.
Powiązania:
https://bibliotekanauki.pl/articles/1041409.pdf
Data publikacji:
2020-12-18
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
Latin nimbus
Iranien *nambV-
réduplication
instrument
Iranian *nambV-
reduplication
Opis:
After a brief review of prior etymological attempts found in the literature, a complete, rule-governed etymology of Latin nimbus ‘rain cloud, sudden downpour, etc.’ – including a precise explanation of the medial nasal – is propounded. It is based on the Indo-European reduplication process that produces nouns, as delineated by Cohen (2014; 2015; 2017), and on Latin sound laws given and exemplified by Weiss (2009).
Aprés une récapitulation brève des essais étymologiques antécédents, qui sont trouvés dans la littérature, une étymologie de latin nimbus ‘nuage de pluie, forte averse soudaine, etc’ complète et d’accord avec règle – en comprenant une explication précise de la nasale médiale – est proposée. Elle est basée sur le processus indo-européen de réduplication qui genère les noms, comme décrit par Cohen (2014; 2015; 2017), et sur des lois phonologiques latines donneés et exemplifiés par Weiss (2009).
Źródło:
Collectanea Philologica; 2020, 23; 5-8
1733-0319
2353-0901
Pojawia się w:
Collectanea Philologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
la mort
Autorzy:
Czechowicz, Józef
Współwytwórcy:
Niedziałkowska, Marta
Paul, Magdalena
S., M.
Sekuła, Aleksandra
Data publikacji:
2008-12-29
Wydawca:
Fundacja Nowoczesna Polska
Tematy:
Dwudziestolecie międzywojenne
Wiersz
Liryka
Opis:
Publikacja zrealizowana w ramach projektu Wolne Lektury (http://wolnelektury.pl). Reprodukcja cyfrowa wykonana przez Bibliotekę Narodową z egzemplarza pochodzącego ze zbiorów BN.
Źródło:
Józef Czechowicz, Dzień jak codzień, F. Hoesick, Warszawa 1930.
Dostawca treści:
Wolne Lektury
Książka
Tytuł:
Calculation of Lattice Relaxation in Some Substitutional Alloys Using a Green Function
Autorzy:
Das, S. K.
Datta Roy (Paul), S.
Powiązania:
https://bibliotekanauki.pl/articles/1995663.pdf
Data publikacji:
1999-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Bb
61.82.Bg
Opis:
In this paper we calculate nearest neighbour relaxation in some dilute substitutional alloys using a lattice static Green function and the Morse potential function. Distant neighbour relaxation is calculated by invoking a continuum approximation. The potential parameters for the unlike interactions are calculated using simple interpolation formulae. Using the above relaxation, we calculate volume changes in the above alloys. It is observed that the simple model predicts values which are in reasonably good agreement with the experimental values in all cases. The calculated values are also compared with those obtained from the Vegard law. For Au-Ag alloy, our model reproduces both the correct sign and the magnitude of the volume change, whereas the Vegard law cannot even give the sign of the volume change. This shows the inherent strength of the present model.
Źródło:
Acta Physica Polonica A; 1999, 95, 3; 359-366
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Green Function Estimation of Correction to Vegards Law for isovalent Substitutional Defects in Alkali Halide Crystals
Autorzy:
Datta Roy (Paul), S.
Das, S. K.
Powiązania:
https://bibliotekanauki.pl/articles/2013286.pdf
Data publikacji:
2000-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.72.Bb
61.82.Bg
Opis:
A Green function method is developed for estimation of lattice parameter r(χ) of an AX-BX solid solution over entire composition range (χ=0 to 1). The r(χ) obtained in the present method is different from the value r$\text{}_{V}$(χ) suggested by Vegard's law. We estimated the deviation from Vegard's law, r(χ)-r$\text{}_{V}$(χ), over entire composition range for isovalent substitutional defect in alkali halide crystals. When compared to X-ray diffraction measurements, we find that the deviation is in correct direction, variation of r(χ) with χ is consistent with experiment and the overall agreement is fairly good considering the accuracy of the experiment.
Źródło:
Acta Physica Polonica A; 2000, 97, 4; 671-679
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Compressive Deformation Behavior of an Ultrafine/Nano Grained AZ31 Magnesium Processed by Accumulative Back Extrusion
Autorzy:
Fatemi, S. M.
Zarei-Hanzaki, A.
Paul, H.
Powiązania:
https://bibliotekanauki.pl/articles/356044.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
compressive deformation
AZ31magneium alloy
accumulative back extrusion
Opis:
An AZ31magneium alloy was processed through accumulative back extrusion (ABE) process at 280 °C up to six passes. Compressive deformation behavior of the processed materials was studied by employing uniaxial compression tests at room temperature. The results indicated that grains of 80 nm to 1 µm size were formed during accumulative back extrusion, where the mean grain size of the experimental material was reduced by applying successive ABE passes. A deformation texture characterizing with the basal plane mainly lie inclined to the deformation axis was developed. Compressive yield and maximum compressive strengths were measured to increase by applying successive extrusion passes, while the strain-to-fracture dropped. The evolution of mechanical properties was explained relying on the grain refinement effect as well as texture change. It was described that the share of different deformation mechanisms and developing of shearing regions near the grain boundaries may influence the deformation behavior of the ultrafine/nano grained AZ31 alloy.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 3; 1593-1600
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluating the Factors Affecting High School Student Rebellion
Autorzy:
Ganiron, Thomashley S.
Fajardo, Prinnah
Baniago, Paul Andrei
Barcelona, Mervin
Powiązania:
https://bibliotekanauki.pl/articles/1179249.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Adolescence
peer pressure
psychological effect
stem course
student independence
student rebellion
Opis:
Although research has uncovered important psychological effects of student rebellion in high school, the factors of student rebellion have not been fully explored. This descriptive study aimed to identify and analyze the factors that motivate students to rebel and find solutions to the student's problem. Young people turn their back on their parents, leave home and lose touch. The individual respondents were selected students of STEM (Science, Engineering, Technology, and Mathematics) courses of Sta Clara Parish School using purposive sampling. It utilized validated researcher-made questionnaire, unstructured interview, and documentary analysis as its data gathering instruments. The data gathered were treated using frequency, percentage count, and weighted mean,
Źródło:
World Scientific News; 2017, 80; 158-176
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bioleaching of nickel by Aspergillus humicola SKP102 isolated from Indian lateritic overburden
Autorzy:
Ghosh, S.
Paul, A. K.
Powiązania:
https://bibliotekanauki.pl/articles/92057.pdf
Data publikacji:
2016
Wydawca:
Główny Instytut Górnictwa
Tematy:
Fungal bioleaching
Aspergillus humicola
chromite mining overburden
nickel leaching
bioługowanie
wymywanie niklu
Opis:
The lateritic deposits spread over the Eastern Ghats of Sukinda Valley, Odisha, India, produce a huge amount of overburden annually as a byproduct of chromite mining. This chromite mining overburden contains nickel, the only source of the metal in the country. During this study Aspergillus humicola SKP102, an indigenous fungus isolated from the mining overburden was employed for the leaching of nickel. About 53.89% of the nickel could be leached by the fungus when grown in batch mode using a Czapek dox medium containing 2% (w/v) of the mining overburden. The parameters affecting bioleaching were optimized in order to grow the fungus and leach the metal. Of the different options of cheap carbon sources, straw infusion and molasses emerged as viable options for the growth of the fungus and the leaching of nickel. Two-step and indirect techniques were also used for this purpose, and they resulted in 53.09% and 65.04% Ni leaching respectively. Adding diluted sulfuric acid to the leaching medium resulted in 97.05% nickel recovery from the overburden pulp. A. humicola SKP102 could be a potential tool for leaching nickel from the mining overburden.
Źródło:
Journal of Sustainable Mining; 2016, 15, 3; 108-114
2300-1364
2300-3960
Pojawia się w:
Journal of Sustainable Mining
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aspergillus niger, a dominant phylloplane coloniser, influences the activity of defense enzymes in Solanum lycopersicum
Autorzy:
Goswami, S.
Paul, P.K.
Sharma, P.D.
Powiązania:
https://bibliotekanauki.pl/articles/2084798.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Aspergillus niger
phylloplane
peroxidase
phenylalanine ammonia lyase
polyphenol oxidase
Solanum lycopersicum
tyrosine ammonia lyase
Opis:
Phylloplane microbes have been studied as strategic tools in management against plant pathogens. Non-pathogenic bacteria and fungi have been applied as crop protectants against various plant diseases. The present study aimed at evaluating the potentiality of Aspergillus niger spores in altering the activity of four key enzymes related to defense in tomato. The experiment was designed such that two groups of 50 tomato plants were considered: group 1 – sprayed with autoclaved distilled water (control) and group 2 – sprayed with A. niger spores. Spraying was carried out under aseptic conditions. The experimental parameters included analysis of the activity of peroxidase (POX), polyphenol oxidase (PPO), phenylalanine ammonia lyase (PAL) and tyrosine ammonia lyase (TAL) as well as expression of POX and PPO isoforms. The results demonstrated an inductive effect of A. niger on the activity of POX, PPO, PAL and TAL. Enhanced expression of POX and PPO isoforms was also observed. The results indicated that A. niger can be considered probiotic for the management of tomato against its phytopathogens.
Źródło:
Journal of Plant Protection Research; 2019, 59, 4; 512-518
1427-4345
Pojawia się w:
Journal of Plant Protection Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gaps in the Saturation Spectrum of Trees
Autorzy:
Horn, Paul
Gould, Ronald J.
Jacobson, Michael S.
Thomas, Brent J.
Powiązania:
https://bibliotekanauki.pl/articles/31343596.pdf
Data publikacji:
2019-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
saturation spectrum
tree
saturation number
Opis:
A graph G is H-saturated if H is not a subgraph of G but the addition of any edge from the complement of G to G results in a copy of H. The minimum number of edges (the size) of an H-saturated graph on n vertices is denoted sat(n,H), while the maximum size is the well studied extremal number, ex(n,H). The saturation spectrum for a graph H is the set of sizes of H-saturated graphs between sat(n,H) and ex(n,H). In this paper we show that paths, trees with a vertex adjacent to many leaves, and brooms have a gap in the saturation spectrum.
Źródło:
Discussiones Mathematicae Graph Theory; 2019, 39, 1; 157-170
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The list Distinguishing Number Equals the Distinguishing Number for Interval Graphs
Autorzy:
Immel, Poppy
Wenger, Paul S.
Powiązania:
https://bibliotekanauki.pl/articles/31342143.pdf
Data publikacji:
2017-02-01
Wydawca:
Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
Tematy:
distinguishing
distinguishing number
list distinguishing
interval graph
Opis:
A distinguishing coloring of a graph G is a coloring of the vertices so that every nontrivial automorphism of G maps some vertex to a vertex with a different color. The distinguishing number of G is the minimum k such that G has a distinguishing coloring where each vertex is assigned a color from {1, . . ., k}. A list assignment to G is an assignment L = {L(v)}v∈V (G) of lists of colors to the vertices of G. A distinguishing L-coloring of G is a distinguishing coloring of G where the color of each vertex v comes from L(v). The list distinguishing number of G is the minimum k such that every list assignment to G in which |L(v)| = k for all v ∈ V (G) yields a distinguishing L-coloring of G. We prove that if G is an interval graph, then its distinguishing number and list distinguishing number are equal.
Źródło:
Discussiones Mathematicae Graph Theory; 2017, 37, 1; 165-174
2083-5892
Pojawia się w:
Discussiones Mathematicae Graph Theory
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corrosion behavior of ZrC particles reinforcement with Al-12Si composites by weight loss method using acidic media
Autorzy:
John, C. F.
Paul, R. C.
Singh, S. C. E.
Jacobjose, J.
Ramkumar, T.
Hikku, G. S.
Sharma, R. K.
Sengottuvel, P.
Powiązania:
https://bibliotekanauki.pl/articles/200059.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Al-Si-ZrC composites
powder metallurgy
weight loss method
corrosion rate
SEM
kompozyty Al-Si-ZrC
metalurgia proszków
metoda redukcji masy
szybkość korozji
Opis:
This paper aims to investigate the corrosion behavior of zirconium carbide (ZrC) reinforced Al – Si metal matrix composites (MMCs) in a mixture of acidic solution using weight loss method. The composites are prepared by powder metallurgy method. Al-12Si-xZrC composites containing 0, 5, and 10 weight percentage of ZrC particles are compacted in a die set assembly and sintered in an inert gas muffle furnace. The acidic solutions used for corrosion are 1 N HCl, 1 N H2SO4 and 1 N HNO3. The corrosion characteristics of Al-12Si-xZrC composites and the pure Al were experimentally evaluated. The corrosion test was carried out at different weight proportions of the samples in various concentrations of the acid such as 1 N HCl, 1 N H2SO4 and 1 N HNO3 for different exposure time (i.e., 24 h, 72 h, 144 h and 216 h), respectively. The results specified that corrosion rate of composites was lower than that of base metal Al under the corrosive atmosphere, regardless of exposure time and acidic solutions used as corrodents. Al-12Si-xZrC composites become more corrosion resistant as the ZrC content is increased. This is because of the development of stable oxide layer above the specimens. Scanning electron microscopy (SEM) confirms the degree of attack of acidic solution on the surface of the examined material.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2018, 66, 1; 9-16
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 33

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