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Wyszukujesz frazę "AC" wg kryterium: Temat


Tytuł:
Compact AC-operators
Autorzy:
Doust, Ian
Walden, Byron
Powiązania:
https://bibliotekanauki.pl/articles/1288073.pdf
Data publikacji:
1996
Wydawca:
Polska Akademia Nauk. Instytut Matematyczny PAN
Tematy:
AC-operators
Opis:
We prove that compact AC-operators have a representation as a combination of disjoint projections which mirrors that for compact normal operators. We also show that unlike arbitrary AC-operators, compact AC-operators admit a unique splitting into real and imaginary parts, and that these parts must necessarily be compact.
Źródło:
Studia Mathematica; 1995-1996, 117, 3; 275-287
0039-3223
Pojawia się w:
Studia Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer analysis of the current-regulated delta modulator with hexagonal quantizer
Autorzy:
Nieznański, J.
Iwan, K.
Powiązania:
https://bibliotekanauki.pl/articles/1954050.pdf
Data publikacji:
1998
Wydawca:
Politechnika Gdańska
Tematy:
computer analysis
current-regulated delta modulator
hexagonal quantizer
simulation research
ac motor drive applications
Opis:
This paper reports extensive simulation research into the use of the hexagonal quantizer in current-regulated delta modulators (CRDMs) for AC motor drive applications. It is demonstrated that the hexagonal quantizer with an appropriately selected threshold significantly lowers the current harmonic distortion and dramatically reduces the switching frequency of inverter devices, as compared to the conventional CRDM. Basic information is given on how the simulations were organized and sequenced to ensure fast steady-state convergence, as well as minimize the required data transfers.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 1998, 2, 1; 73-83
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of Hydrostatic Pressure on Photoluminescence Spectra from Structures with Si Nanocrystals Fabricated in SiO$\text{}_{2}$ Matrix
Autorzy:
Zhuravlev, K.
Tyschenko, I.
Vandyshev, E.
Bulytova, N.
Misiuk, A.
Rebohle, L.
Skorupa, W.
Powiązania:
https://bibliotekanauki.pl/articles/2035528.pdf
Data publikacji:
2002-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.55.Ac
73.63.Bd
78.67.-n
68.35.Fx
Opis:
The effect of hydrostatic pressure applied at high temperature on photoluminescence of Si-implanted SiO$\text{}_{2}$ films was studied. A "blue"-shift of PL spectrum from the SiO$\text{}_{2}$ films implanted with Si$\text{}^{+}$ ions to total dose of 1.2×10$\text{}^{17}$ cm$\text{}^{-2}$ with an increase in hydrostatic pressure was observed. For the films implanted with Si$\text{}^{+}$ ions to a total dose of 4.8×10$\text{}^{16}$ cm$\text{}^{-2}$ high temperature annealing under high hydrostatic pressure (12 kbar) causes a "red"-shift of photoluminescence spectrum. The "red" photoluminescence bands are attributed to Si nanocrystals while the "blue" ones are related to Si nanocrystals of reduced size or chains of silicon atoms or ≡Si-Si≡ defects. A decrease in size of Si nanocluster size occurs in result of the pressure-induced decrease in the diffusion of silicon atoms.
Źródło:
Acta Physica Polonica A; 2002, 102, 2; 337-344
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermal Desorption of Au from W(001) Surface
Autorzy:
Błaszczyszyn, R.
Chrzanowski, J.
Godowski, P.
Powiązania:
https://bibliotekanauki.pl/articles/2035647.pdf
Data publikacji:
2002-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.43.Vx
68.55.Ac
68.60.Dv
Opis:
Adsorption of Au on W(001) at 450 K up to multilayer structures was investigated. Temperature programmed desorption technique was used in determination of coverage dependent desorption energy (region up to one monolayer). Results were discussed in terms of competitive interactions of Au-Au and Au-W atoms. Simple procedure for prediction of faceting behavior on the interface, basing on the desorption data, was postulated. It was deduced that the Au/W(001) interface should not show faceting tendency after thermal treatment.
Źródło:
Acta Physica Polonica A; 2002, 102, 6; 785-794
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Oktawian August
Autorzy:
Southern, Pat.
Współwytwórcy:
Kozińska, Dorota (1964- ). Tłumaczenie
Data publikacji:
2003
Wydawca:
Warszawa : Państwowy Instytut Wydawniczy
Tematy:
Oktawian, August (cesarz rzymski)
Oktawian August (cesarz rzymski; 63 a.C.-14) biografia
Przywódcy i głowy państw Rzym 1 w. p.n.e.-1 w.
Polityka biografie Rzym 1 w. p.n.e.- 1 w.
Biografia
Opis:
Tyt. oryg..: "Augustus" 1998.
Bibliogr. Indeks.
Dostawca treści:
Bibliografia CBW
Książka
Tytuł:
STM/STS Studies of the Structural Phase Transition in the Growth of Ultra-Thin Bi Films on Si(111)
Autorzy:
Sadowski, J. T.
Nagao, T.
Saito, M.
Oreshkin, A.
Yaginuma, S.
Hasegawa, S.
Ohno, T.
Sakurai, T.
Powiązania:
https://bibliotekanauki.pl/articles/2036956.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ef
68.47.De
68.55.Ac
Opis:
Growth of thin metal films on semiconductors has been always an important subject for extensive experimental and theoretical studies. As the applicability of well-ordered nanostructures in electronic applications depends strongly on their size and distribution, it is necessary to understand the processes that govern the growth of such structures. In this paper we present the results of investigation of the room temperature growth of thin Bi film on Si(111). In our study we clarified that rotationally disordered, pseudo-cubic Bi(012) islands with uniform height of ≈13Å are formed in the initial stage of Bi film growth. With increase in the amount of bismuth on the surface, islands interconnect maintaining however their uniform height. This process is further accompanied by the unique and unexpected structural phase transition of the Bi(012) film into a hexagonal Bi(001) film.
Źródło:
Acta Physica Polonica A; 2003, 104, 3-4; 381-387
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Electronic Properties of Fe Nanoparticles on c(2×2)-N/Cu(001)
Autorzy:
Getzlaff, M.
Bode, M.
Wiesendanger, R.
Powiązania:
https://bibliotekanauki.pl/articles/2036899.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ef
68.55.Ac
68.65.-k
73.22.Dj
81.15.Kk
Opis:
We prepared nanoscaled particles consisting of ferromagnetic material on a nanostructured template. This nanolithographic procedure allows to fabricate high-density magnetic nanodots in a highly ordered way. For this purpose, Fe particles were grown on the c(2×2)-N/Cu(001) surface which exhibits a checkerboard-like structure. Scanning tunneling spectroscopic measurements demonstrate that the electronic properties of the areas with deposited material are identical to clean copper. Fe nanoparticles on the reconstructed patches show a significantly different electronic behavior. These observations directly hint to a covering of iron with copper on the clean surface.
Źródło:
Acta Physica Polonica A; 2003, 104, 3-4; 327-335
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variable Temperature STM/STS Investigations of Ag Nanoparticles Growth on Semiconductor Surfaces
Autorzy:
Suto, S.
Czajka, R.
Szuba, S.
Shiwa, A.
Winiarz, S.
Nagashima, H.
Kato, H.
Yamada, T.
Kasuya, A.
Powiązania:
https://bibliotekanauki.pl/articles/2036896.pdf
Data publikacji:
2003
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
68.37.Ef
68.47.Fg
68.55.Ac
Opis:
We have investigated the growth of Ag nanoparticles deposited on Si(111), H/Si(111)-(1×1) and Bi$\text{}_{2}$Te$\text{}_{3}$ substrates using a variable temperature scanning tunneling microscopy. These substrates are different as regards the model system for cluster and islands growth at the nanometer scale. Ag was evaporated onto the sample mounted at the scanning tunneling microscopy stage in vacuum of 10$\text{}^{-10}$ Torr range during evaporation. The substrates were kept at different temperatures: -150˚C, room temperature, and 300˚C during the deposition process. In general, we have observed 3D growth mode up to several ML coverage. The density of clusters and their size were functions of the substrate's temperature during the deposition process - a higher density and a smaller size at -150˚C were in opposition to the 300˚C results - a lower density and a larger size. Low temperature depositions led to continuous layers above 10 ML coverage but the surface was covered by small Ag clusters of 1-2 nm in heights and 2-3 nm in diameters. The log-log graphs of height and projected diameter of Ag clusters revealed different slopes indicating different growth mechanisms at low and high temperatures. We obtained the value of n=0.25±0.02, typical of the so-called droplet model of cluster growth, only at 300˚C. Scanning tunneling spectroscopy measurements revealed clearly different I-V (and dI/dV vs. bias voltage) curves measured above clusters and directly above the substrate. In discussion, we compared our results to theoretically calculated density of states from other papers, finding conformity for partial density of states.
Źródło:
Acta Physica Polonica A; 2003, 104, 3-4; 289-302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Néels Magnetostatic Coupling in Sputtered Cu/Py/V/Py/MnIr/Cu Multilayers
Autorzy:
Urbaniak, M.
Brückl, H.
Stobiecki, F.
Luciński, T.
Reiss, G.
Powiązania:
https://bibliotekanauki.pl/articles/2037183.pdf
Data publikacji:
2004-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.Cn
68.65.Ac
Opis:
The correlation between magnetostatic or Néel's coupling and roughness of interfaces in sputtered Cu/Py/V/Py/MnIr/Cu multilayers was investigated with the help of atomic force microscopy and magnetometry. It is shown that the coupling strongly depends on the roughness of seed Cu layer which in turn depends on sputtering power. Roughness levels off after deposition of consecutive layers to about 0.2 nm rms.
Źródło:
Acta Physica Polonica A; 2004, 105, 3; 307-313
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Samoloty gunship. Cz. 1-2
Autorzy:
Cieślak, Eugeniusz.
Powiązania:
Lotnictwo 2004, nr 10 →
Data publikacji:
2004
Tematy:
AC-130 (samolot) zastosowanie bojowe Stany Zjednoczone 1970-2004 r.
AC-130 (samolot) użycie Irak
Wojna 1964-1973 r. amerykańsko-wietnamska działania powietrzne
Samoloty bojowe zastosowanie bojowe Stany Zjednoczone 1970-2004 r.
Opis:
[Cz. 1]:; Wojna wietnamska; nr 10; s. 40-45.
[Cz. 2]:; Ku nowym możliwościom; nr 11; s. 30-36.
Fot.
Dostawca treści:
Bibliografia CBW
Artykuł

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