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Wyświetlanie 1-15 z 29
Tytuł:
Elastic Behaviour and Lattice Vibrations in bcc V and Nb
Autorzy:
Verma, A.
Verma, M. L.
Rathore, R. P. S.
Powiązania:
https://bibliotekanauki.pl/articles/1946133.pdf
Data publikacji:
1996-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
63.20.Dj
62.20.Dc
Opis:
A model is developed by extending the generalised form of exponential potential known as extended generalised exponential potential to account for: (a) a realistic realization of interactions in all separations in general and that of small separations in particular, (b) three-body and electronic effects into the interaction in an alternative and simpler form, (c) a model free from usual fitting procedure. The model is employed to compute the cohesive energy, phonon spectra and second- and third-order elastic constants for group VA bcc metals V and Nb. The computed results showing good agreement with the experimental findings lend reliability and credibility to the potential.
Źródło:
Acta Physica Polonica A; 1996, 90, 3; 547-556
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Applications of a compact "water window" source for investigations of nanostructures using SXR microscope
Autorzy:
Torrisi, A.
Wachulak, P.
Fahad Nawaz, M.
Bartnik, A.
Adjei, D.
Vondrová, Š.
Turňová, J.
Jančarek, A.
Fiedorowicz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1065141.pdf
Data publikacji:
2016-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.38.-r
42.30.-d
42.62.-b
87.59.-e
68.37.Yz
07.85.Tt
41.50.+h
42.79.Dj
Opis:
A compact soft X-ray microscope based on a nitrogen double-stream gas puff target soft X-ray source, operating at He-like nitrogen spectral line at the wavelength of λ =2.88 nm is presented. The desk-top size microscope was successfully demonstrated in transmission mode using the Fresnel zone-plate objective and it is suitable for soft X-ray source microscopy in the "water window" spectral range (λ = 2.3÷ 4.4 nm). Details about the soft X-ray source source, the microscope and an example of application in the biomedical field are shown and discussed.
Źródło:
Acta Physica Polonica A; 2016, 129, 2; 169-171
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron and Exciton Quasi-Stationary s-States in Open Spherical Quantum Dots
Autorzy:
Tkach, M.
Seti, Ju.
Voitsekhivska, O.
Powiązania:
https://bibliotekanauki.pl/articles/1419890.pdf
Data publikacji:
2012-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.15.Dx
73.21.La
73.22.Dj
73.90.+f
Opis:
The theoretical calculation of spectral parameters of electron and exciton quasi-stationary s-states in open spherical quantum dot is performed within the effective mass approximation and rectangular potentials model. The conceptions of probability distribution functions (over quasi-momentum or energy) of electron location inside of quantum dot and their spectral characteristics: generalized resonance energies and widths are introduced. It is shown that the generalized resonance energies and widths, obtained within the distribution functions, satisfy the Heisenberg uncertainty principle for the barrier widths varying from zero to infinity. At the same time, the ordinary resonance energies and widths defined as complex poles of scattering S-matrix, do not satisfy it for the small barrier widths and, therefore, are correct only for the open quantum dots with rather wide potential barriers.
Źródło:
Acta Physica Polonica A; 2012, 122, 1; 207-211
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie wymiernych oznaczeń sensorycznych do badania aktywności przeciwutleniającej dymu wędzarniczego i jego faz
Primenenie opredelimykh sensori`eskikh obozna`enijdlja issledovanija antiokislitel`noj aktivnosti koptitel`nogo dyma i ego faz
The application of mesurable sensory evoluation in the determination of antioxidative properties of curing smoke and it`s phases
Autorzy:
Tilgner, D.J.
Daun, H.
Kopacz, H.
Powiązania:
https://bibliotekanauki.pl/articles/1836103.pdf
Data publikacji:
1967
Wydawca:
Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Źródło:
Roczniki Technologii i Chemii Żywności; 1967, 14; 119-128
0080-374X
Pojawia się w:
Roczniki Technologii i Chemii Żywności
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Theoretical Investigation of Distortionless Enhancement by Polarization Transfer and Subspectral Editing with a Multiple Quantum Trap NMR Spectroscopy for CX$\text{}_{n}$ Groups
Autorzy:
Tezel, Ö.
Gençten, A.
Tokatli, A.
Şahĺn, M.
Bahçelı, S.
Powiązania:
https://bibliotekanauki.pl/articles/2037004.pdf
Data publikacji:
2003-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Dj
82.56.Jn
Opis:
Product operator theory is widely used for analytical description of multiple pulse nuclear magnetic resonance experiments for weakly coupled spin systems. Distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap NMR experiments are used for spectral assignments of $\text{}^{13}$C NMR spectra in CH$\text{}_{n}$ groups. First, in this study we proposed and showed theoretically that distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap experiments can also be used for subspectral editing of $\text{}^{13}$C NMR spectra when $\text{}^{13}$C nuclei coupled to spin-3/2 nuclei. The product operator technique is applied for the analytical description of $\text{}^{13}$C distortionless enhancement by polarization transfer and subspectral editing with a multiple quantum trap NMR spectroscopy for $\text{}^{13}$CX$\text{}_{n}$ ($I_{X}$=3/2; n=1, 2, 3) groups.
Źródło:
Acta Physica Polonica A; 2003, 104, 5; 503-511
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electronic Properties of Thin HfO$\text{}_{2}$ Films Fabricated by Atomic Layer Deposition on 4H-SiC
Autorzy:
Taube, A.
Gierałtowska, S.
Gutt, T.
Małachowski, T.
Pasternak, I.
Wojciechowski, T.
Rzodkiewicz, W.
Sawicki, M.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/2048120.pdf
Data publikacji:
2011-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.55.dj
77.22.Jp
73.40.Qv
81.15.Gh
Opis:
Applicability of thin HfO$\text{}_{2}$ films as gate dielectric for SiC MOSFET transistor is reported. Layers characterisation was done by means of atomic force microscopy and scanning electron microscopy, spectroscopic ellipsometry and C-V and I-V measurements of MIS structures. High permittivity dielectric layers were deposited using atomic layer deposition. Investigation showed high value of κ = 15 and existence of high density surface states (5 × 10$\text{}^{12}$ eV$\text{}^{-1}$ cm$\text{}^{-2}$) on HfO$\text{}_{2}$/SiC interface. High leakage current is caused probably due to low conduction band offset between hafnium oxide and silicon carbide.
Źródło:
Acta Physica Polonica A; 2011, 119, 5; 696-698
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
High Quality Gate Insulator/GaN Interface for Enhancement-Mode Field Effect Transistor
Autorzy:
Taube, A.
Kruszka, R.
Borysiewicz, M.
Gierałtowska, S.
Kamińska, E.
Piotrowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/1492515.pdf
Data publikacji:
2011-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
77.55.dj
77.22.Ch
73.40.Qv
81.15.Gh
81.15.Cd
Opis:
The capacitance-voltage measurements were applied for characterization of the semiconductor/dielectric interface of GaN MOS capacitors with $SiO_2$ and $HfO_2//SiO_2$ gate stacks. From the Terman method low density of interface traps $(D_{it} \approx 10^{11} eV^{-1} cm^{-2})$ at $SiO_2//GaN$ interface was calculated for as-deposited samples. Samples with $HfO_2//SiO_2$ gate stacks have higher density of interface traps as well as higher density of mobile charge and effective charge in the dielectric layers. High quality of $SiO_2//GaN$ interface shows applicability of $SiO_2$ as a gate dielectric in GaN MOSFET transistors.
Źródło:
Acta Physica Polonica A; 2011, 120, 6A; A-022-A-024
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Common mode behavior in grid connected DC and AC decoupled PV Inverter topologies
Autorzy:
Sundar, D.J.
Kumaran, M.S.
Powiązania:
https://bibliotekanauki.pl/articles/141723.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
distributed generation
common mode leakage current
solar PV systems
transformerless PV inverters
Opis:
The transformer-less grid connected inverters are gaining more popularity due to their high efficiency, very low ground leakage current and economic feasibility especially in photovoltaic systems. The major issue which surfaces these systems is that of common mode leakage current which arises due to the absence of an electrical transformer connected between the inverter and the utility grid. Several topologies have evolved to reduce the impact of common mode leakage current and a majority of them have succeeded in eliminating the impacts and have well kept them within the limits of grid standards. This paper compares and analyses the impact of the common mode leakage current for four popular inverter configurations through simulation of the topologies such as H5, H6, HERIC and FBZVR inverters.
Źródło:
Archives of Electrical Engineering; 2016, 65, 3; 481-493
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Specyfika pracy dziennikarza muzycznego w radiu publicznym
Characteristics of music journalist’s work in a public radio station
Autorzy:
Stańczyk, Piotr
Powiązania:
https://bibliotekanauki.pl/articles/649793.pdf
Data publikacji:
2012
Wydawca:
Uniwersytet Łódzki. Wydawnictwo Uniwersytetu Łódzkiego
Tematy:
radio broadcast
music broadcast
radio DJ
polish national radio
program types
Opis:
The Author specifies the role of a musical journalist and a radio DJ in a public radio station, dividing DJ duties into five categories: playing DJ broadcasts, preparing programmes of two types, music series and musical setting.
Źródło:
Acta Universitatis Lodziensis. Folia Litteraria Polonica; 2012, 17, 3; 197-199
1505-9057
2353-1908
Pojawia się w:
Acta Universitatis Lodziensis. Folia Litteraria Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A Product Operator Theory of DEPTQ NMR Spectroscopy for $IS_{n}$ (I = 1/2; S = 1; n = 0, 1, 2, 3) Spin Systems
Autorzy:
Şaka, İ.
Gençten, A.
Gümüş, S.
Powiązania:
https://bibliotekanauki.pl/articles/1493681.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Dj
82.56.Jn
Opis:
Distortionless enhancement by polarization transfer including the detection of quaternary nuclei is a carbon-editing pulse NMR experiment. In this experiment multiplicity information for all carbons including quaternary carbons are obtained. In the present study, analytical descriptions of DEPTQ NMR experiment have been investigated for weakly coupled $IS_{n}$ (I = 1/2; S = 1; n = 0, 1, 2, 3) spin systems by using the product operator theory. Then, the theoretical discussion and the experimental suggestions for sub-spectral editing of C, CD, $CD_2$ and $CD_3$ groups have been presented. The comparison of the obtained results with those of the basic distortionless enhancement by polarization transfer NMR experiment has been also performed for $CD_{n}$ groups. It is shown that DEPTQ experiment can be also used for $CD_{n}$ groups.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 541-544
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Subspectral Editing with a Multiple Quantum Trap of IS$\text{}_{n}$ Spin Systems by Using Product Operator Theory
Autorzy:
Şahin, M.
Tokatli, A.
Bahçeli, S.
Gençten, A.
Powiązania:
https://bibliotekanauki.pl/articles/2036880.pdf
Data publikacji:
2003-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
82.56.Dj
82.56.Jn
Opis:
Product operator theory was often used to describe analytically multipulse NMR experiments for weakly coupled spin systems. In this study first we introduce the descriptions of subspectral editing with a multiple quantum trap NMR spectra for IS$\text{}_{n}$ I=1 /2, S=5/2 with n=1, 2, 3) spin systems by using product operator formalism. These theoretical investigations lead us to form the general expressions for the intensities of the spin -1/2 nuclei coupled to the nuclei with spin ≥5/2. The obtained results can be used for the spectral editing in both liquid-state and solid-state NMR experiments. Furthermore, in order to satisfy the obtained analytical expressions for signal intensities we add the presentation of analytically description of subspectral editing with a multiple quantum trap sequence for weakly coupled IS (I=1/2, S=7/2) spin system.
Źródło:
Acta Physica Polonica A; 2003, 104, 1; 73-80
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An Australian multituberculate and its palaeobiogeographic implications
Autorzy:
Rich, T H
Vickers-Rich, P.
Flannery, T.F.
Kear, B.P.
Cantrill, D.J.
Komarower, P.
Kool, L.
Pickering, D.
Trusler, P.
Morton, S.
Van Klaveren, N.
Fitzgerald, E.M.G.
Powiązania:
https://bibliotekanauki.pl/articles/22948.pdf
Data publikacji:
2009
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Tematy:
Corriebaatar marywaltersae
Cretaceous
new species
multituberculate
Gondwana
fossil
paleontology
new genus
Australia
Multituberculata
Cimolodonta
Mammalia
Opis:
A dentary fragment containing a tiny left plagiaulacoid fourth lower premolar from the Early Cretaceous (Aptian) of Victoria provides the first evidence of the Multituberculata from Australia. This unique specimen represents a new genus and species, Corriebaatar marywaltersae, and is placed in a new family, Corriebaataridae. The Australian fossil, together with meagre records of multituberculates from South America, Africa, and Madagascar, reinforces the view that Multituberculata had a cosmopolitan distribution during the Mesozoic, with dispersal into eastern Gondwana probably occurring prior to enforcement of climatic barriers (indicated by marked differentiation in regional floras) in the Early Cretaceous.
Źródło:
Acta Palaeontologica Polonica; 2009, 54, 1; 1-6
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Geometric-Confinement Parameters on the Electronic Properties of Quantum Ring
Autorzy:
Moskal, S.
Spisak, B. J.
Powiązania:
https://bibliotekanauki.pl/articles/2047364.pdf
Data publikacji:
2007-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.23.Ra
73.22.Dj
73.43.Cd
Opis:
We investigate the electronic properties of the quantum rings modelled by a two-dimensional non-singular potential with the cylindrical symmetry as well as the influence of the potential's parameters on energy spectra. In the presence of the external magnetic field we also calculated the persistent currents in such structures in the ballistic regime.
Źródło:
Acta Physica Polonica A; 2007, 112, 1; 101-112
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Properties of~Rf Plasma Nitrided Silicon Thin Films at Different Rf Plasma Processing Powers
Autorzy:
Mohamed, S.
Raaif, M.
Abd El-Rahman, A.
Shaaban, E.
Powiązania:
https://bibliotekanauki.pl/articles/1493713.pdf
Data publikacji:
2011-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.15.Dj
61.05.cp
73.61.-r
78.66.-w
Opis:
Nitrided surfaces and composition gradients in thin films exhibit interesting mechanical, electrical and optical properties. Therefore, silicon (Si) thin films were prepared by electron beam evaporation and nitrided by an inductively coupled rf plasma. The effects of successive plasma processing power on structural and optical properties as well as electrical resistivity were examined by different characterization techniques. The Si thin films were transformed gradually into nitrides compound thin films and the amount of nitrogen in the film increased with increasing the rf processing power. The Si nitrided films showed structural, optical and electrical properties that depend on the nitriding power. Increasing the rf plasma processing power caused amorphization, reduced the thickness, increased transmittance, increased resistivity and decreased the reflectance of the Si films. The electrical resistivity increased about eight orders of magnitude when the sample nitrided at 500 W. Different optical band gap were determined indicating the presence of different competing phases in the same film. The decrease in refractive index with plasma treatment power is attributed to the possible change in the bucking density as well as to the increase in the band gap.
Źródło:
Acta Physica Polonica A; 2011, 120, 3; 552-557
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopic and Laser Properties of Different Materials Doped with Pr$\text{}^{3+}$ Ions
Autorzy:
Mierczyk, Z.
Kaczmarek, S.
Kopczyński, K.
Frukacz, Z.
Pracka, I.
Łukasiewicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/1945655.pdf
Data publikacji:
1996-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.70.Hj
78.20.Dj
78.55.Hx
Opis:
Examined praseodymium doped crystals with 1 at.% of Pr$\text{}^{3+}$ ions for Y$\text{}_{3}$Al$\text{}_{5}$O$\text{}_{12}$ (YAG), SrLaGa$\text{}_{3}$O$\text{}_{7}$ (SLGO) hosts and 3 at.% of Pr$\text{}^{3+}$ ions for YAlO$\text{}_{3}$ (YAP) hosts were produced using Czochralski method. The luminescence for the range of 200÷800 nm and absorption spectra for a wide range of 200÷6000 nm, for Pr$\text{}^{3+}$:YAG, Pr$\text{}^{3+}$:SLGO and Pr$\text{}^{3+}$:YAP crystals have been measured. A free-running laser emission of λ=0.744 μm for Pr:YAG and λ=0.729 μm for Pr:SLGO for two different transmissions of output mirrors has been obtained.
Źródło:
Acta Physica Polonica A; 1996, 90, 2; 407-410
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 29

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