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Wyszukujesz frazę "Kruse, A." wg kryterium: Autor

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    Wyświetlanie 1-8 z 8
    Tytuł:
    Thermodynamic analysis of a thermoacoustic travelling wave engine
    Autorzy:
    Ruziewicz, A.
    Kruse, A.
    Gnutek, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/95348.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    thermoacoustic engine
    Stirling cycle
    waste energy
    energy conversion
    silnik termoakustyczny
    obieg Stirlinga
    energia odpadowa
    konwersja energii
    Opis:
    Thermoacoustics has become a promising technology to use heat from low temperature sources to drive engines. This study proposes a single-stage thermoacoustic travelling-wave engine for waste-heat recovery at 150°C. All the construction details of such a system are provided. A recently developed configuration of a looped tube with an impedance matching side-branch stub is proposed. A numerical model of the engine is built in DeltaEC software to conduct the simulations. Furthermore, a detailed thermodynamic analysis of the engine is presented, including an energy balance, a description of the basic acoustic parameters in a steady state, as well as a study of a variable load influence on the performance of the engine. The Authors pointed out the necessity of the engine optimization and a proper choice of load related acoustic impedance, which would consider a trade-off between high power and high efficiency. Eventually, a possibility of achieving 40% exergy efficiency of the proposed engine is confirmed.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2018, 2, 1; 67-74
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On merging and dividing social graphs
    Autorzy:
    Held, P.
    Dockhorn, A.
    Kruse, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/91788.pdf
    Data publikacji:
    2015
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    social interaction
    modeling
    Barabási-Albert-model
    Watts-Strogatz-model
    Erd˝os-Rényi-model
    graph
    algorithm
    interakcja społeczna
    modelowanie
    model Barabasi-Albert-Model
    model Watts-Strogatz
    model Erdős-Renyi
    wykres
    algorytm
    Opis:
    Modeling social interaction can be based on graphs. However most models lack the flexibility of including larger changes over time. The Barabási-Albert-model is a generative model which already offers mechanisms for adding nodes. We will extent this by presenting four methods for merging and five for dividing graphs based on the Barabási- Albert-model. Our algorithms were motivated by different real world scenarios and focus on preserving graph properties derived from these scenarios. With little alterations in the parameter estimation those algorithms can be used for other graph models as well. All algorithms were tested in multiple experiments using graphs based on the Barabási- Albert-model, an extended version of the Barabási-Albert-model by Holme and Kim, the Watts-Strogatz-model and the Erd˝os-Rényi-model. Furthermore we concluded that our algorithms are able to preserve different properties of graphs independently from the used model. To support the choice of algorithm, we created a guideline which highlights advantages and disadvantages of discussed methods and their possible use-cases.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2015, 5, 1; 23-49
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties of CdTe QDs Formed Using Zn Induced Reorganization
    Autorzy:
    Kobak, J.
    Pacuski, W.
    Jakubczyk, T.
    Kazimierczuk, T.
    Golnik, A.
    Frank, K.
    Rosenauer, A.
    Kruse, C.
    Hommel, D.
    Gaj, J. A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048054.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.Ta
    78.67.Hc
    Opis:
    In this paper we present optical studies of CdTe quantum dots formed using Zn-induced reorganization. The pattern of quantum dot photoluminescence lines is found to be similar to typical results reported for quantum dots grown with other techniques, although the positively charged exciton line is relatively more pronounced. Also the energy spacing between biexciton and exciton lines is found to be larger than in typical results. Zn-induced reorganization results in quantum dots density higher by an order of magnitude than in Te-induced quantum dots.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 627-629
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Toward Better Light-Confinement in Micropillar Cavities
    Autorzy:
    Ściesiek, M.
    Gietka, K.
    Golnik, A.
    Kossacki, P.
    Jakubczyk, T.
    Pacuski, W.
    Kruse, C.
    Hommel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492873.pdf
    Data publikacji:
    2011-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Pt
    42.70.Qs
    42.79.Fm
    78.66.Hf
    Opis:
    We report on a two-step etching of ZnTe based micropillars. We demonstrate applicability of the technology and we analyze the optical properties of obtained structures. Microphotoluminescence spectra of individual micropillars show a typical mode pattern that confirms a successful growth of photonic structures. The reflectivity and photoluminescence spectra of a planar microcavity measured for various incident angles show that additional side distributed Bragg reflectors will be important for the further enhancement of photon confinement in micropillar cavity.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 5; 877-879
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Study of ZnTe-Based 2D and 0D Photonic Structures Containing CdTe/ZnTe Quantum Dots
    Autorzy:
    Jakubczyk, T.
    Kazimierczuk, T.
    Golnik, A.
    Bienias, P.
    Pacuski, W.
    Kruse, C.
    Hommel, D.
    Kłopotowski, Ł.
    Wojtowicz, T.
    Gaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791336.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.67.Pt
    Opis:
    We report on an optical study of ZnTe-based microcavity and micropillars. Angle-resolved reflectivity studies confirm a high quality of the investigated structure by setting the lower bound on the quality factor Q ≥ 1000, determined from normal-incidence reflection spectra. In a microphotoluminescence study, micropillar modes are observed at temperatures of the order of tens of kelvins. For structures grown by a complex growth procedure at two different MBE facilities, an enhancement of photoluminescence in the cavity mode is observed.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 888-889
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Deep Levels Induced by CdTe/ZnTe Quantum Dots
    Autorzy:
    Zielony, E.
    Placzek-Popko, E.
    Roznicka, A.
    Gumienny, Z.
    Szatkowski, J.
    Dyba, P.
    Pacuski, W.
    Kruse, C.
    Hommel, D.
    Guziewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2048061.pdf
    Data publikacji:
    2011-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.61.Ga
    73.21.La
    73.20.Hb
    Opis:
    The electrical properties of the CdTe/ZnTe quantum dot system have been analyzed to identify deep-level defects related with the presence of quantum dots. The capacitance-voltage (C-V) and deep level transient spectroscopy measurements were used to investigate the samples. A reference ZnTe sample (without dots) was also studied for comparison. Both samples were grown by molecular beam epitaxy technique on the n-type GaAs substrate. The quantum dots were formed by a Zn-induced reorganization of a thin CdTe layer. The presence of quantum dot formation was confirmed by micro-photoluminescence measurements. The deep level transient spectra for both samples are complex. In order to characterize individual contributions to the deep level transient spectra the latter have been simulated by separated Gaussian components [1]. The results of the deep level transient spectroscopy measurements yield the conclusion that the same defects are present in both materials but there is an increased concentration of the defects in the quantum dot structures. No deep level associated directly with the quantum dot confinement has been identified.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 5; 630-632
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cold Atomic Gases in Optical Lattices with Disorder
    Autorzy:
    Schulte, T.
    Drenkelforth, S.
    Kruse, J.
    Ertmer, W.
    Arlt, J. J.
    Kantian, A.
    Sanchez-Palencia, L.
    Santos, L.
    Sanpera, A.
    Sacha, K.
    Zoller, P.
    Lewenstein, M.
    Zakrzewski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044614.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.75.Kk
    03.75.Lm
    05.30.Jp
    64.60.Cn
    Opis:
    Cold atomic gases placed in optical lattices enable studies of simple condensed matter theory models with parameters that may be tuned relatively easily. When the optical potential is randomized (e.g. using laser speckle to create a random intensity distribution) one may be able to observe Anderson localization of matter waves for non-interacting bosons, the so-called Bose glass in the presence of interactions, as well as the Fermi glass or quantum spin glass for mixtures of fermions and bosons.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 89-99
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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