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Wyszukujesz frazę "Cooper, J." wg kryterium: Autor

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    Wyświetlanie 1-10 z 10
    Tytuł:
    Quantum Optics of a Bose-Einstein Condensate
    Autorzy:
    Lewenstein, M.
    You, L.
    Cooper, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931512.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.-t
    32.70.Jz
    42.50.Fx
    Opis:
    We present a review of recent experimental and theoretical attempts to realize and investigate Bose-Einstein condensation in systems of cooled alkali atoms. We discuss a second quantized theory that describes quantum optics of such systems. We study in detail: (a) the weak field scattering off the condensate; and (b), the probing of the condensate with short laser pulses.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 173-190
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum States and Number-Phase Uncertainty Relations Measured by Optical Homodyne Tomography
    Autorzy:
    Raymer, M. G.
    Smithey, D. T.
    Beck, M.
    Cooper, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931411.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.65.Bz
    42.50.Wm
    Opis:
    Experiments have been performed to determine the Wigner distribution and the density matrix (and for pure states the wave function) of a light mode, by using tomographic inversion of a set of measured probability distributions for quadrature amplitudes. From these measurements the quantum distributions of optical phase and photon number have been obtained. The measurements of quadrature-amplitude distributions for a temporal mode of the electromagnetic field are carried out using balanced homodyne detection. We refer to this new method as optical homodyne tomography. Given the measured density matrix, one can experimentally infer any of the various quantum distributions of optical phase, in particular the Pegg-Barnett (or, equivalently, Shapiro-Shepard) phase distribution, the marginal Wigner distribution, and the Vogel-Schleich operational phase distribution. We have used this approach to make measurements of the number-phase uncertainty relation for coherent-state fields. The coherent states do not attain the minimum value for the number-phase uncertainty product, as set by the expectation value of the commutator of the number and phase operators; this is true theoretically and experimentally.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 71-80
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stochastic Carrier Dynamics in Semiconductor Superlattices
    Autorzy:
    Fromhold, T. M.
    Bujkiewicz, S.
    Patanè, A.
    Stapleton, S. P.
    Sherwood, D.
    Fowler, D.
    Cooper, J.
    Eaves, L.
    Belyaev, A. E.
    Krokhin, A. A.
    Neumann, A.
    Wilkinson, P. B.
    Sankeshwar, N. S.
    Henini, M.
    Sheard, F. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044604.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.At
    73.21.Cd
    Opis:
    We explore a new regime of hot carrier dynamics, in which electrons in a superlattice miniband exhibit a unique type of stochastic motion when a magnetic field is tilted at an angle θ to the superlattice axis. Remarkably, the dynamics of a miniband electron in a tilted magnetic field reduce to a one-dimensional simple harmonic oscillator, of angular frequency ω$\text{}_{C}$ cos θ, where ω$\text{}_{C}$ is the cyclotron frequency, driven by a time-dependent plane wave whose angular frequency equals the Bloch frequency ω$\text{}_{B}$. At bias voltages for which ω$\text{}_{B}$=nω$\text{}_{C}$ cos θ, where n is an integer, the electron orbits change from localised Bloch-like trajectories to unbounded stochastic orbits, which diffuse rapidly through intricate web patterns in phase space. To quantify how these webs affect electron transport, we make drift-diffusion calculations of the current-voltage curves including the effects of space-charge build up. When the magnetic field is tilted, our simulations reveal a large resonant peak, which originates from stochastic delocalisation of the electron orbits. We show that the corresponding quantised eigenstates change discontinuously from a highly localised character when the system is off resonance to a fully delocalised form when the resonance condition is satisfied.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 43-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Remediation of polluted waters and wastewater by radiation processing
    Autorzy:
    Sampa, M. H. O.
    Takács, E.
    Gehringer, P.
    Rela, P. R.
    Ramirez, T.
    Amro, H.
    Trojanowicz, M.
    Botelho, M. L.
    Han, B.
    Solpan, D.
    Cooper, W. J.
    Emmi, S. S.
    Wojnárovits, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/147644.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    electron beam
    wastewater treatment
    pesticides
    dyes
    degradation
    radiation technology
    Opis:
    Application of radiation processing for drinking water, wastewater, and groundwater treatment is a cost effective process which may insure adequate availability of that resource worldwide. This paper summarizes the results of a Coordinated Research Project (organized by the IAEA) with participants from 10 countries with the purpose of describing the degradation mechanism of organic impurities, and establishing optimal treatment conditions. Decoloration, disinfection, microbiological and toxicological experiments are also mentioned. These experiments led to pilot plants and also to a large scale industrial realization of radiation technology.
    Źródło:
    Nukleonika; 2007, 52, 4; 137-144
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Boquillas Formation of the Big Bend National Park, Texas, USA, a reference Cenomanian through Santonian (Upper Cretaceous) carbonate succession at the southern end of the Western Interior Seaway
    Autorzy:
    Cooper, D. A.
    Cooper, R.W.
    Stevens, J. B.
    Stevens, M. S.
    Cobban, W. A.
    Walaszczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/139039.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Boquillas Formation
    Upper Cretaceous
    US Western Interior Seaway
    lithostratigraphy
    biostratigraphy
    paleoenvironment
    formacja Boquillas
    górna kreda
    litostratygrafia
    biostratygrafia
    paleośrodowisko
    Opis:
    The upper lower Cenomanian through middle Santonian (Upper Cretaceous) of the Boquillas Formation in the Big Bend Region of Trans-Pecos Texas consists of a marine carbonate succession deposited at the southern end of the Western Interior Seaway. The Boquillas Formation, subdivided into the lower, c. 78 m thick limestone-shale Ernst Member, and the upper, c. 132 m thick limestone/chalk/marl San Vicente Member, was deposited in a shallow shelf open marine environment at the junction between the Western Interior Seaway and the western margins of the Tethys Basin. Biogeographically, the area was closely tied with the southern Western Interior Seaway. The richly fossiliferous upper Turonian, Coniacian and lower Santonian parts of the Boquillas Formation are particularly promising for multistratigraphic studies.
    Źródło:
    Acta Geologica Polonica; 2017, 67, 4; 547-565
    0001-5709
    Pojawia się w:
    Acta Geologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of Exciton Fine Structure Splitting in Quantum Dots
    Autorzy:
    Stevenson, R. M.
    Young, R. J.
    Atkinson, P.
    Cooper, K.
    Ritchie, D. A.
    Shields, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2046985.pdf
    Data publikacji:
    2006-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.Mn
    78.67.Hc
    78.55.Cr
    Opis:
    Quantum dots have been identified as potential sources of entangled photon pairs, essential for many applications in quantum information. However, in practice structural properties of the dots result in polarisation splitting of the emission lines, which has prevented the realisation of such a source. Here, we present two techniques developed to control the polarisation splitting in a quantum dot both irreversibly and reversibly. We find that the splitting is strongly dependent upon the emission energy, or lateral confinement, of the quantum dot. Thus by precise control of the InAs deposition thickness, it is possible to produce ensembles from which dots with zero polarisation splitting can be easily selected. Additionally, we demonstrate that by using modest in-plane magnetic fields to partially mix the bright and dark exciton states, the polarisation splitting can be reversibly tuned to zero for most dots of a certain type. Finally, we demonstrate the emission of triggered entangled photon pairs from a quantum dot with approximately zero splitting with fidelity >70%.
    Źródło:
    Acta Physica Polonica A; 2006, 110, 3; 311-318
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pulsed Power and Power Conditioning Capacitors
    Autorzy:
    Macdougall, F.
    Jow, T.
    Ennis, J.
    Yang, X.
    Yen, S.
    Cooper, R.
    Gilbert, J.
    Schneider, M.
    Naruo, C.
    Bates, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1807873.pdf
    Data publikacji:
    2009-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    84.32.Tt
    84.60.Ve
    Opis:
    A capacitor development effort focused on capacitors used in pulsed power and power conversion applications underwent at General Atomics Electronic Systems Inc. (GA-ESI) for decades. In recent years, funding for these efforts has accelerated the rate of development progress to the point where the time it takes to decrease the size of a capacitor by half has dropped from 10 years to 4 years. This progress made in pulsed power and power conversion capacitors will be described along with the performance characteristics of today's capacitors.
    Źródło:
    Acta Physica Polonica A; 2009, 115, 6; 989-991
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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