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Wyświetlanie 1-15 z 72
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:
Cavity-Polariton Effects in II-VI Microcavities
Autorzy:
André, R.
Boeuf, F.
Heger, D.
Dang, Le Si
Romestain, R.
Bleuse, J.
Müller, M.
Powiązania:
https://bibliotekanauki.pl/articles/2011103.pdf
Data publikacji:
1999-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
42.55.Sa
78.66.-w
Opis:
Semiconductor microcavities are monolithic multilayer heterostructures grown by molecular beam epitaxy. They allow the confinement along the growth axis of both photons between the Bragg reflectors and excitons in quantum wells. If the exciton-photon coupling matrix element is large enough compared to the line width, the system is said to be in the strong coupling regime. In that case a quantum well exciton couples to another discrete state: the photon mode of a planar microcavity with the same in-plane wave vector, to give rise to quasi-stationary states named cavity polaritons. In this regime, the Fermi golden rule does not hold any more and the optical properties, linear or nonlinear, are strongly related to polariton features. A review of the optical properties of CdTe-based microcavities operating in the strong coupling regime is given in this paper. The strength of the exciton-photon coupling, dynamic optical properties, and relaxation processes along polariton dispersion curves will be discussed, as well as stimulated emission of cavity polariton luminescence.
Źródło:
Acta Physica Polonica A; 1999, 96, 5; 511-524
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An improved formula for dead time correction of G-M detectors
Autorzy:
Arkani, M.
Khalafi, H.
Powiązania:
https://bibliotekanauki.pl/articles/147009.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dead time model
Geiger-Müller (G-M) detector
decaying source experiment
hybrid model
Opis:
Different analytical formulae have been described in the literature to modify response of Geiger-Müller (G-M) detectors. In this work, improvement of a previously proposed dead time correction formula was investigated. A set of experimental data of a decaying source was the basis of the analysis. A general agreement is seen with the experimental data. The result was compared with those obtained by the original work. Numerical aspects were also examined.
Źródło:
Nukleonika; 2013, 58, 4; 533-536
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficient dead time correction of G-M counters using feed forward artificial neural network
Autorzy:
Arkani, M.
Khalafi, A.
Powiązania:
https://bibliotekanauki.pl/articles/146121.pdf
Data publikacji:
2013
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dead time
artificial neural network (ANN)
Geiger-Müller (G-M) detector
hybrid model
source decaying experiment
Opis:
Dead time parameter of Geiger-Müller (G-M) counters causes a great uncertainty in their response to the incident radiation intensity at high counting rates. As their applications in experimental nuclear science are widespread, many attempts have been done on improvements of their nonlinear response. In this work, response of a G-M counter system is optimized and corrected efficiently using feed forward artificial neural network (ANN). This method is simple, fast, and provides the answer to the problem explicitly with no need for iteration. The method is applied to a set of decaying source experimental data measured by a fairly large G-M tube. The results are compared with those predicted by a given analytical model which is called hybrid model. The maximum deviation of the corrected results from the true counting rates is less than 4% which is a significant improvement in comparison with the results obtained by the analytical method. Results of this study show that by using a proper artificial neural network structure, the dead time effects of G-M counters can be tolerated significantly.
Źródło:
Nukleonika; 2013, 58, 2; 317-321
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electroluminescence Investigation of the Lateral Field Distribution in AlGaN/GaN HEMTs for Power Applications
Autorzy:
Baeumler, M.
Polyakov, V.
Gütle, F.
Dammann, M.
Benkhelifa, F.
Waltereit, P.
Reiner, R.
Müller, S.
Wespel, M.
Quay, R.
Mikulla, M.
Wagner, J.
Ambacher, O.
Powiązania:
https://bibliotekanauki.pl/articles/1197910.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Fi
85.30.De
85.30.Tv
85.40.Bh
85.40.Qx
73.40.-c
73.90.+f
73.61.Ey
73.50.Mx
Opis:
The lifetime and stability of AlGaN/GaN heterostructure field effect transistors at high power levels can be enhanced by introducing field plates to reduce electric field peaks in the gate-drain region. Simulations of the electric field distribution along the channel using the 2D ATLAS software from Silvaco indicate that above a characteristic drain source voltage three spatially separated electric field peaks appear, one located at the drain-side edge of the gate foot, one at the end of the drain-sided gate field plate, and one at the end of the source shield field plate. The close correlation between lateral electric field and the electroluminescence due to hot electron related intra-band transitions can be very helpful when optimizing the electric field distribution in high power devices. Electroluminescence microscopy images of devices with gate and source shield field plate reveal the peaks located at the locations of enhanced electric field. By studying the voltage dependence of the electroluminescence peaks the influence of the field plates on the electric field distribution in source drain direction can be visualized.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 982-985
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Lingula dregeri (Brachiopoda) from the Middle Miocene of Hungary
Autorzy:
Bitner, M. A.
Dulai, A.
Kocsis, L.
Müller, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/191757.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Geologiczne
Tematy:
Brachiopoda
Lingula
Middle Miocene
Pannonian Basin
Hungary
Opis:
Lingulide brachiopods, assigned to Lingula dregeri Andreae, 1893, have been identified from the Middle Miocene (Upper Badenian) of the Hungarian part of the Pannonian Basin. Although widely distributed in the Miocene of the Central Paratethys (Austria, Poland, Ukraine, Romania), the genus Lingula was not described previously from Hungary. Outside of the Central Paratethys, L. dregeri also has been recognized in the Atlantic and Mediterranean provinces and most probably in the Eastern Paratethys.
Źródło:
Annales Societatis Geologorum Poloniae; 2012, 82, 1; 39--43
0208-9068
Pojawia się w:
Annales Societatis Geologorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new locality of Monacha cartusiana (O.F.Muller, 1774) (Gastropoda: Pulmonata: Helicidae) in Poland
Autorzy:
Cholewa, S.
Koralewska-Batura, E.
Batura, M.
Powiązania:
https://bibliotekanauki.pl/articles/84494.pdf
Data publikacji:
2003
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Monacha cartusiana (O. F. Müller, 1774) was found in a new site in western Poland. The site is located in the city of Poznań, outside the continuous distribution range of the species. It is probably a result of accidental introduction by man.
Źródło:
Folia Malacologica; 2003, 11, 1-2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positronium for antihydrogen production in the AEGIS experiment
Autorzy:
Consolati, G.
Aghion, S.
Amsler, C.
Bonomi, G.
Brusa, R.
Caccia, M.
Caravita, R.
Castelli, F.
Cerchiari, G.
Comparat, D.
Demetrio, A.
Di Noto, L.
Doser, M.
Evans, C.
Fanì, M.
Ferragut, R.
Fesel, J.
Fontana, A.
Gerber, S.
Giammarchi, M.
Gligorova, A.
Guatieri, F.
Haider, S.
Hinterberger, A.
Holmestad, H.
Kellerbauer, A.
Khalidova, O.
Krasnicky, D.
Lagomarsino, V.
Lansonneur, P.
Lebrun, P.
Malbrunot, C.
Mariazzi, S.
Marton, J.
Matveev, V.
Mazzotta, Z.
Müller, S.
Nebbia, G.
Nedelec, P.
Oberthaler, M.
Pacifico, N.
Pagano, D.
Penasa, L.
Petracek, V.
Prelz, F.
Prevedelli, M.
Ravelli, L.
Rienaecker, B.
Robert, J.
Røhne, O.
Rotondi, A.
Sandaker, H.
Santoro, R.
Smestad, L.
Sorrentino, F.
Testera, G.
Tietje, I.
Widmann, E.
Yzombard, P.
Zimmer, C.
Zmeskal, J.
Zurlo, N.
Powiązania:
https://bibliotekanauki.pl/articles/1057954.pdf
Data publikacji:
2017-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
04.80.Cc
07.77.-n
36.10.Dr
78.70.Bj
Opis:
The primary goal of the Antihydrogen Experiment: Gravity, Interferometry, Spectroscopy (AEGIS) collaboration is to measure for the first time precisely the gravitational acceleration of antihydrogen, H̅, a fundamental issue of contemporary physics, using a beam of antiatoms. Indeed, although indirect arguments have been raised against a different acceleration of antimatter with respect to matter, nevertheless some attempts to formulate quantum theories of gravity, or to unify gravity with the other forces, consider the possibility of a non-identical gravitational interaction between matter and antimatter. We plan to generate H̅ through a charge-exchange reaction between excited Ps and antiprotons coming from the Antiproton Decelerator facility at CERN. It offers the advantage to produce sufficiently cold antihydrogen to make feasible a measurement of gravitational acceleration with reasonable uncertainty (of the order of a few percent). Since the cross-section of the above reaction increases with n⁴, n being the principal quantum number of Ps, it is essential to generate Ps in a highly excited (Rydberg) state. This will occur by means of two laser excitations of Ps emitted from a nanoporous silica target: a first UV laser (at 205 nm) will bring Ps from the ground to the n=3 state; a second laser pulse (tunable in the range 1650-1700 nm) will further excite Ps to the Rydberg state.
Źródło:
Acta Physica Polonica A; 2017, 132, 5; 1443-1449
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of physico-chemical conditions on the shape of growth curves of Anodonta anatina (Linnaeus, 1758)
Autorzy:
Czarnoleski, M.
Dragosz-Kluska, D.
Labecka, A.M.
Muller, T.
Powiązania:
https://bibliotekanauki.pl/articles/83865.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Tematy:
physicochemical condition
shape
growth curve
Anodonta anatina
life strategy
biotic factor
abiotic factor
female
male
lake
Źródło:
Folia Malacologica; 2012, 20, 1
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hybrid lvl panels made of eucalypt and pine woods decayed by white-rot fungus
Autorzy:
Delucis, R.
Herrera, R.
Melo, R.
Muller, M.
Labidi, J.
Gatto, D.
Powiązania:
https://bibliotekanauki.pl/articles/52545.pdf
Data publikacji:
2018
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Źródło:
Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2018, 61, 201
1644-3985
Pojawia się w:
Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Corbicula fluminea (O. F. Müller, 1774) (Bivalvia: corbiculidae) – a species new to the Polish malacofauna
Autorzy:
Domagala, J.
Labecka, A.M.
Pilecka-Rapacz, M.
Migdalska, B.
Powiązania:
https://bibliotekanauki.pl/articles/84175.pdf
Data publikacji:
2004
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
Dispersal of the exotic bivalve Corbicula fluminea has been observed in Europe for more than 20 years. In October 2003, the bivalve was for the first time recorded in Poland; its first Polish site is the heated water canal of the Dolna Odra power station in Western Pomerania.
Źródło:
Folia Malacologica; 2004, 12, 3
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Changes in the activity of glucose-6-phosphatase in tissues of Helix aspera (O.F.Muller) acclimated at 5 degrees of Celcjusz and 25 degrees of Clelcjusz
Autorzy:
Dziewulska-Szwajkowska, D.
Lozinska-Gabska, M.
Dzugaj, A.
Powiązania:
https://bibliotekanauki.pl/articles/84330.pdf
Data publikacji:
2001
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Źródło:
Folia Malacologica; 2001, 09, 2
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The invasion continues - a new locality of Monacha cartusiana (O.F. Muller) (Gastropoda: pulmonata: Helicidae) in the Swietokrzyskie Mts (Central Poland)
Autorzy:
Gorka, M.
Powiązania:
https://bibliotekanauki.pl/articles/83584.pdf
Data publikacji:
2005
Wydawca:
Uniwersytet Mikołaja Kopernika. Wydział Biologii i Ochrony Środowiska. Stowarzyszenie Malakologów Polskich
Opis:
A new locality of Monacha cartusiana (O. F. Müller) was found in the city of Kielce, Central Poland. The colony of snails is located above the edge of an abandoned quarry. The new site may suggest that M. cartusiana keeps expanding its distribution range in Poland.
Źródło:
Folia Malacologica; 2005, 13, 4
1506-7629
Pojawia się w:
Folia Malacologica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soccer in the Media, Public Mood and Government Popularity
Autorzy:
Hagen, Lutz M.
Zeh, Reimar
Müller-Klier, Maike
Powiązania:
https://bibliotekanauki.pl/articles/643225.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Jagielloński. Wydawnictwo Uniwersytetu Jagiellońskiego
Tematy:
media coverage, public mood, media influence, soccer, sports coverage, political discourse, election campaign, national identity, media content, emotions
Opis:
This paper examines the relationship between the media coverage of soccer and political popularity of certain parties during election campaigns which usually followed the world soccer games. The national team’s success on the pitch is related to victory in the political match. This surprising link between the national success in sports and the success in an election for a party or a candidate is explained in the light of Public Mood Theory, founded by W. Rahn, who pointed out that emotions play an important role in political behaviour and national identity, which, in turn, is influenced by the media content, like sports coverage among others. The creation of national identity is mostly built on the national success in sports. Especially in Germany, where soccer is number one sport in media coverage. Sports matches produce winners and losers, thus strongly influencing Public Mood, which is relevant for the formation of political evaluations and judgments, in a democracy shaped by emotions. Sports can shape Public Mood only if they are reported in the media. The analysis of the relationship between interest in soccer and political popularity, presented in the paper, shows how the media coverage of soccer influenced the German political attitudes in 2002, to an extent that it might have been decisive for the election.
Źródło:
Zeszyty Prasoznawcze; 2013, 56, 1
0555-0025
2084-3836
Pojawia się w:
Zeszyty Prasoznawcze
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 72

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