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Wyświetlanie 1-15 z 1165
Tytuł:
Quantum Optics of Atomic Wave-Packets
Autorzy:
Rzążewski, K.
Plaja-Rustein, L.
Pumares-Carceller, L.
Roso-Franco, L.
Żakowicz, W.
Powiązania:
https://bibliotekanauki.pl/articles/1931537.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.50.Md
42.50.Vk
Opis:
Recent progress in production and control of the atomic wave-packets calls for re-examination of the most fundamental quantum optical processes. We have examined the evolution of the atomic wave-packet resonantly driven by the monochromatic laser beam and the spontaneous emission from an extended atom. We stress the role of Doppler shifts in the dephasing of the atomic dipole. New effects of single laser pulse photon echo and homogeneous Doppler modification of the emission line are discussed.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 279-286
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Time-Resolved Emission from Semiconductor Microcavities
Autorzy:
Kłopotowski, Ł.
Viña, L.
Kavokin, A.
Dang, L. S.
André, R.
Powiązania:
https://bibliotekanauki.pl/articles/2038372.pdf
Data publikacji:
2004-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.36.+c
71.55.Gs
78.47.+p
Opis:
We present a time-resolved study of the light emission of a CdTe-based microcavity. In the nonlinear regime, under high excitation conditions, in the strong coupling regime, we observe pronounced beats of the intensity of the photoluminescence arising from the bottleneck region of the exciton-polariton band. These beats are very sensitive to the excitation density and vanish under weak pumping conditions. We attribute the beats to a new nonlinear coupling mechanism of optically active and dark crystal states, related to polariton-polariton scattering, which leads to mixing between bright and dark states.
Źródło:
Acta Physica Polonica A; 2004, 106, 3; 435-442
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Road to Quantum Boxes
Autorzy:
Chang, L. L.
Powiązania:
https://bibliotekanauki.pl/articles/1946514.pdf
Data publikacji:
1996-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.20.Dx
73.61.-r
78.66.-w
Opis:
Quantum wells and superlattices have evolved over the last two decades to become a prominent multi-disciplinary field in condensed matter science. From the first observation of resonant tunneling to the recent realization of the quantum box, in this work we provide a summary description of the historical development of the field, known today as quantum structures. The focus is on the physics aspect with emphasis on important experimental observations that collectively define the field and set its direction of development.
Źródło:
Acta Physica Polonica A; 1996, 90, 4; 603-612
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement System for Fractional Glow Technique
Autorzy:
Pietkun, A.
Polakiewicz, L.
Oczkowski, H. L.
Powiązania:
https://bibliotekanauki.pl/articles/1920791.pdf
Data publikacji:
1992-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.60.Kn
Opis:
Some details of computerized arrangement for recording fractional thermoluminescence at high temperatures are presented. The investigation of energy distribution of traps for quartz crystals exemplifies the measurement procedure and data handling.
Źródło:
Acta Physica Polonica A; 1992, 81, 6; 687-691
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synchrotron Mössbauer Reflectometry - Recent Applications in Multilayer Magnetism
Autorzy:
Nagy, D. L.
Bottyán, L.
Deák, L.
Major, M.
Powiązania:
https://bibliotekanauki.pl/articles/2028927.pdf
Data publikacji:
2001-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.70.-i
75.25.+z
75.30.Gw
76.80.+y
Opis:
Grazing incidence nuclear resonant scattering of synchrotron radiation (synchrotron Mössbauer reflectometry) has recently been efficiently applied to study the magnetic structure of multilayers. Principles and recent experiments of synchrotron Mössbauer reflectometry are briefly reviewed. The orientation of the layer magnetization in an antiferromagnetically coupled multilayer is determined both from time-integral and time-differential specular synchrotron Mössbauer reflectometry experiments. Spin-flop phenomena are studied. Off-specular (diffuse) scattering gives information on the in-plane antiferromagnetic domain structure.
Źródło:
Acta Physica Polonica A; 2001, 100, 5; 669-678
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffusion Length Studies in CdMnTe by the Surface Photovoltage Method
Autorzy:
Płaczek-Popko, E.
Szaro, L.
Jędral, L.
Powiązania:
https://bibliotekanauki.pl/articles/1879853.pdf
Data publikacji:
1991-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.40.+w
Opis:
The surface phototovoltage method provides a nondestructive means of measuring minority carriers diffusion length and is suitable for process control applications and for material acceptance tests. Application of the method in the case of CdMnTe compounds has been studied in the present paper. The optimum measurement conditions have been investigated by studying the dependence of measured diffusion length on the experimental conditions. As the surface photovoltage method requires the exact values of absorption coefficient as a function of wavelength, α = f(λ), the dependence has been determined. The minority carrier diffusion length for the sample investigated has been found to be equal to several tenth of μm.
Źródło:
Acta Physica Polonica A; 1991, 79, 2-3; 187-190
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Some Aspects Concerning the "Memorization Effect" in Complex Fluid
Autorzy:
Agop, M.
Ochiuz, L.
Timofte, D.
Barlescu, V.
Danila, M.
Gheorghita, L.
Paun, V.
Solovastru, L.
Popa, C.
Powiązania:
https://bibliotekanauki.pl/articles/1204873.pdf
Data publikacji:
2014-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
05.45.Df
47.53.+n
03.65.-w
Opis:
In the frame of a non-standard scale relativity model, the specific momentum, states density and internal energy conservations laws are obtained. The chaoticity, either through turbulence in the fractal hydrodynamics approach, or through stochasticization in the Schrödinger type approach, is generated only by the non-differentiability of the movement trajectories of the complex fluid entities. Using the conservation laws mentioned above, by numerical simulations, hysteretic type effects (dynamics of hysteretic cycles) occur.
Źródło:
Acta Physica Polonica A; 2014, 126, 3; 663-669
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron Transmission through Graphene Bilayer Flakes
Autorzy:
Chico, L.
González, J.
Santos, H.
Pacheco, M.
Brey, L.
Powiązania:
https://bibliotekanauki.pl/articles/1419511.pdf
Data publikacji:
2012-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
73.22.-f
73.63.-b
Opis:
We investigate the electronic transport properties of a bilayer graphene flake contacted by two monolayer nanoribbons. This finite-size bilayer flake can be built by overlapping two semi-infinite ribbons. We study and analyze the electronic behavior of this structure by means of a tight-binding method and a continuum Dirac model. We have found that the conductance oscillates markedly between zero and the maximum value of the conductance, allowing for the design of electromechanical switches.
Źródło:
Acta Physica Polonica A; 2012, 122, 2; 299-303
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pulse Heat Treatment of FINEMET Alloys Under Tension
Autorzy:
Lovas, A.
Hubač, L.
Novák, L.
Powiązania:
https://bibliotekanauki.pl/articles/1200788.pdf
Data publikacji:
2014-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
75.50.Kj
75.60.Ej
81.07.Bc
Opis:
In this contribution a less common experimental procedure is presented, which includes simultaneous application of electrical pulse heating, and longitudinal mechanical stress, applied along the ribbon length, for the magnetic property tailoring. The annealing is performed in protecting atmosphere in a vertical tube furnace by applying a weight at the free, cold bottom end of the ribbon. In these circumstances neither nanometer-size grains nor the concentration-distribution have been developed. The static coercive force, anisotropy and demagnetizing factor are monitored as a function of pulse number.
Źródło:
Acta Physica Polonica A; 2014, 126, 1; 100-101
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Positrons and Positroniu m in Grainy and Porous Solids
Autorzy:
Kajcsos, Zs.
Liszkay, L.
Duplâtre, G.
Varga, L.
Lázár, K.
Pál-Borbély, G.
Beyer, H.
Lohonyai, L.
Caullet, P.
Patarin, J.
Powiązania:
https://bibliotekanauki.pl/articles/2025110.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.70.Bj
36.10.Dr
61.43.Gt
Opis:
Systematic investigations have been performed using positron annihilation techniques on micrograins of crystalline powders (e.g., MgO, Al$\text{}_{2}$O$\text{}_{3}$, SiO$\text{}_{2}$) and on various zeolites (e.g., silicalite 1, Na-X, Na-Y, ZSM-5, mordenite) aiming at a better under standing of the formation and decay of the long-lived ortho-positronium states. The techniques were lifetime spectroscopy, Doppler-effect measurements and the recording of the full energy distribution of the annihilation radiation. The influences of heat treatment, sample evacuation and presence of gases were investigated. Lifetimes over 130 ns and o-Ps fractions of about 30% were found. A strong correlation of positron annihilation technique data with a water content of the samples was evidenced. Possible pictures of the formation and decay of ortho-positronium in porous media are discussed.
Źródło:
Acta Physica Polonica A; 2001, 99, 3-4; 399-406
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Influence of the Au Nanoparticles Dimension on the Photocatalytic Performances of $TiO_2-Au$ Porous Composites
Autorzy:
Melinte, G.
Baia, M.
Georgescu, D.
Baia, L.
Iancu, V.
Diamandescu, L.
Popescu, T.
Cotet, L.
Barbu-Tudoran, L.
Danciu, V.
Simon, S.
Powiązania:
https://bibliotekanauki.pl/articles/1491327.pdf
Data publikacji:
2012-01
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Rm
81.07.Wx
82.80.Ej
68.37.Lp
82.65.+r
82.50.Hp
Opis:
The influence of Au nanoparticles dimension on the photocatalytic performances of the $TiO_2$ aerogels-Au composites was evaluated. Structural and morphological peculiarities of the $TiO_2$ aerogel, unloaded and loaded with 5 and 22 nm Au nanoparticles, were studied by transmission electron microscopy technique, X-ray diffraction and $N_2$-sorption measurements. UV-Vis diffuse reflectance measurements were performed to determine the band gap energies. The photocatalytic activity was evaluated by monitoring the salicylic acid photodegradation. It was found that the Au nanoparticles promote the anatase phase crystallization and produce the decrease of the specific surface area and band gap energy values. The porous composite with the smallest Au nanoparticles dimension exhibits the best photocatalytic performances.
Źródło:
Acta Physica Polonica A; 2012, 121, 1; 208-210
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Andreev Reflection Study of the Superconductor $Mo_3Sb_7$
Autorzy:
Dmitriev, V.
Rybaltchenko, L.
Khristenko, E.
Ishchenko, L.
Bukowski, Z.
Troć, R.
Powiązania:
https://bibliotekanauki.pl/articles/1812340.pdf
Data publikacji:
2008-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
74.70.Ad
Opis:
The point-contact Andreev-reflection measurements on the new paramagnetic superconductor $Mo_3Sb_7$ were carried out. It was found that the order parameter ∆ is strongly anisotropic varying over a very wide range depending on the contact orientation when the maximum $∆_\text{max}$ exceeds at least 40 times the minimum $∆_\text{min}$ in spite of the invariable $T_c$ that cannot be typical of conventional superconductors. For these and other reasons we suggest that $Mo_3Sb_7$ is not a trivial BCS (s-wave) superconductor but rather has some unconventional pairing symmetry.
Źródło:
Acta Physica Polonica A; 2008, 114, 1; 263-267
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Antibacterial Activities of Ag/$Nano-TiO_2$ Modified Silicone Elastomer
Autorzy:
Wang, L.
Sun, T.
Zhou, S.
Shao, L.
Powiązania:
https://bibliotekanauki.pl/articles/1215694.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
78.67.Bf
Opis:
We studied the ability of Ag/$nano-TiO_2$ to inhibit Staphylococcus aureus growth on silicone elastomer material. Ag/$nano-TiO_2$ silicone elastomer was prepared with different concentrations of 0%, 2%, 4%, 6%, 8%, 10%. The antibacterial efficacy of Ag/$nano-TiO_2$ silicone elastomer was determined by the inhibition zone method and the impregnated culture method. The antibacterial timeliness of Ag/$nano-TiO_2$ silicone elastomer was tested by direct contact method. The samples were kept through thermal aging process in an accelerated aging chamber. The effect of concentrations of Ag/$nano-TiO_2$ was insignificant (P < 0.05). There was significant difference between the Ag/$nano-TiO_2$ silicone elastomer and the blank silicone elastomer (P < 0.5). There was also significant difference among specimen groups whose aging periods were 50°C, 100°C, 150°C, 200°C for 87 h (P < 0.5). The silicone elastomer with different concentrations of Ag/$nano-TiO_2$ effectively inhibits Staphylococcus aureus growth.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 248-250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
FT-IR, Thermal and NLO Studies on Amino Acid (L-Arginine and L-Alanine) Doped KDP Crystals
Autorzy:
Muley, G.
Rode, M.
Pawar, B.
Powiązania:
https://bibliotekanauki.pl/articles/1585044.pdf
Data publikacji:
2009-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.66.Hq
Opis:
Single crystals of pure and amino acid (L-arginine and L-alanine) doped potassium dihydrogen phosphate (KDP) for second harmonic generation have been grown from low temperature solution growth method by employing slow evaporation of the solvent. FT-IR spectrum of pure and doped KDP crystals confirms qualitatively the doping of the L-arginine and L-alanine in the host crystals. UV-visible spectroscopy shows the improvement in the transparency. Crystal structure has been studied by powder X-ray diffraction. Modification in the lattice parameters has been observed. Improvement in the SHG efficiency was studied by the Kurtz and Perry method. Thermal analysis has been performed on the grown crystals.
Źródło:
Acta Physica Polonica A; 2009, 116, 6; 1033-1038
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defect Analysis of Pentacene Diode
Autorzy:
Stuchlíková, L.
Weis, M.
Juhász, P.
Kósa, A.
Harmatha, L.
Jakabovic, J.
Powiązania:
https://bibliotekanauki.pl/articles/1364022.pdf
Data publikacji:
2014-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
72.80.Le
73.50.Gr
71.55.-i
Opis:
This paper demonstrates the analysis of defect states in pentacene film sandwiched between Au and Al electrodes by the deep-level transient spectroscopy method. Three hole-like deep energy levels were observed. The effective mass obtained from the simulation is applied and defect parameters, namely the capture cross-sections and the activation energy 3.7 × $10^{-18} cm^2$ at 0.34 eV, 3.1 × $10^{-17} cm^2$ at 0.41 eV, and 2.9 × $10^{-15} cm^2$ at 0.63 eV is determined from the Arrhenius plot. Reliability of obtained defect parameters is confirmed by simulation of deep level transient spectra and comparison with experiment.
Źródło:
Acta Physica Polonica A; 2014, 125, 4; 1038-1041
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 1165

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