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    Wyświetlanie 1-12 z 12
    Tytuł:
    Microstructure and Properties of Spark Plasma Sintered Al-Zn-Mg-Cu Alloy
    Autorzy:
    Becker, H.
    Dopita, M.
    Stráská, J.
    Málek, P.
    Vilémová, M.
    Rafaja, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402091.pdf
    Data publikacji:
    2015-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Bx
    81.20.Fw
    81.40.-z
    81.70.-q
    61.43.Gt
    81.20.Ev
    62.20.M-
    Opis:
    The microstructure of an aluminum alloy containing 53 wt% Zn, 2.1 wt% Mg and 1.3 wt% Cu as main alloying elements has been studied with the focus on the precipitation behavior during the spark plasma sintering process. The starting material was an atomized Al-Zn-Mg-Cu powder with the particle size below 50 μm. The particles showed a solidification microstructure from cellular to columnar or equiaxed dendritic morphology with a large fraction of the alloying elements segregated in form of intermetallic phases, mainly (Zn,Al,Cu)₄₉Mg₃₂ and Mg₂(Zn,Al,Cu)₁₁, at the cell and dendrite boundaries. The microstructure of the sintered specimens followed the microstructure of the initial powder. However, Mg(Zn,Al,Cu)₂ precipitates evolve at the expense of the initial precipitate phases. The precipitates which were initially continuously distributed along the intercellular and interdendritic boundaries form discrete chain-like structures in the sintered samples. Additionally, fine precipitates created during the sintering process evolve at the new low-angle boundaries. The large fraction of precipitates at the grain boundaries and especially at the former particle boundaries could not be solved into the matrix applying a usual solid solution heat treatment. A bending test reveals low ductility and strength. The mechanical properties suffer from the precipitates at former particle boundaries leading to fracture after an outer fiber tensile strain of 3.8%.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 4; 602-605
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Defects Introduced by Irradiation with 4-9 MeV Helium Ions on Impedance of Silicon Diodes
    Autorzy:
    Poklonski, N.
    Gorbachuk, N.
    Nha, Vo
    Shpakovski, S.
    Filipenya, V.
    Skuratov, V.
    Kołtunowicz, T.
    Kukharchyk, N.
    Becker, H.
    Wieck, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1402222.pdf
    Data publikacji:
    2015-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.Jv
    61.80.Fe
    Opis:
    Silicon diodes irradiated with helium ions with energies of 4.1, 6.8 and 8.9 MeV are studied. It is shown that the mechanism determining the behaviour of frequency dependence of complex electric module and correspondingly the behavior of impedance of diodes irradiated with helium ions in the frequency region 3-200 kHz is a recharging of vacancy complexes localized in the space charge region.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 5; 891-893
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intercultural differences in decoding facial expressions of the android robot Geminoid F
    Autorzy:
    Becker-Asano, C.
    Ishiguro, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/91612.pdf
    Data publikacji:
    2011
    Wydawca:
    Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
    Tematy:
    intercultural differences
    decoding facial
    android robot
    Geminoid F
    facial display
    Opis:
    As android robots become increasingly sophisticated in their technical as well as artistic design, their non-verbal expressiveness is getting closer to that of real humans. Accordingly, this paper presents results of two online surveys designed to evaluate a female android’s facial display of five basic emotions. Being interested in intercultural differences we prepared both surveys in English, German, as well as Japanese language, and we not only found that in general our design of the emotional expressions “fearful” and “surprised” were often confused, but also that Japanese participants more often confused “angry” with “sad” than the German and English participants. Although facial displays of the same emotions portrayed by the model person of Geminoid F achieved higher recognition rates overall, portraying fearful has been similarly difficult for her. Finally, from the analysis of free responses that the participants were invited to give, a number of interesting further conclusions are drawn that help to clarify the question of how intercultural differences impact on the interpretation of facial displays of an android’s emotions.
    Źródło:
    Journal of Artificial Intelligence and Soft Computing Research; 2011, 1, 3; 215-231
    2083-2567
    2449-6499
    Pojawia się w:
    Journal of Artificial Intelligence and Soft Computing Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Exchange Coupled Double Layers for Magneto-Optical Applications
    Autorzy:
    Becker, S.
    Rohrmann, H.
    Roell, K.
    Stobiecki, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1953155.pdf
    Data publikacji:
    1997-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.70.Ch
    42.79.Vb
    78.20.Ls
    75.70.-i
    Opis:
    Optical data storage is a rapidly developing technique, which emerges in many varieties. Magneto-optical recording, in particular, applies amorphous rare earth/transition metal films, where a binary coded information is written thermomagnetically and is read by the magneto-optical Kerr or Faraday effect. To increase the writing speed and the recording density, techniques for direct overwrite and magnetically induced superresolution were proposed, which involve these of exchange coupled double layer systems as a storage media. In this paper, the principles and the properties of exchange coupled double layers are discussed with respect to the direct overwrite and the magnetically induced superresolution processes. A formalism based on a switching field diagram is developed yielding all information necessary to achieve reliable and practical writing procedures. As an example, the direct overwrite capability is demonstrated experimentally in antiparallel coupled layer systems.
    Źródło:
    Acta Physica Polonica A; 1997, 91, 1; 55-65
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Angular Differential Cross-Sections for Electron Transfer in Collisions between Proton and He$\text{}^{+}$(1s) Ions
    Autorzy:
    Bhattacharyya, S.
    Pathak, K.
    Becker, A.
    Faisal, F. H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952747.pdf
    Data publikacji:
    1996-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    34.70.+e
    34.40.+n
    Opis:
    Angular differential cross-sections for the formation of H, as a result of electron capture by proton from He$\text{}^{+}$(1s) at the centre-of-mass energies from 4 to 24 keV, are calculated using distorted wave Coulomb-Born approximation. The total interaction potentials in the prior-interaction channel and in the post-interaction channel are considered. Coulomb boundary conditions are taken care of with the proper choice of the perturbation potentials in both the prior and the post channels. A prior-post discrepancy is noted. Existing theoretical results are presented along with the present results.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 6; 1143-1153
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early and Middle Frasnian brachiopod faunas and turnover on the South China shelf
    Autorzy:
    Ma, X -P
    Becker, R.T.
    Li, H.
    Sun, Y.-Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/21029.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Paleobiologii PAN
    Tematy:
    Early Frasnian
    Middle Frasnian
    Frasnian
    paleontology
    brachiopod fauna
    South China shelf
    Devonian
    Brachiopoda
    Cyrtospirifer
    faunal turnover
    Opis:
    The first appearance of the brachiopod Cyrtospirifer and related forms in the Late Devonian of South China significantly postdates the beginning of the Frasnian and the entry of the group in other parts of the world. Scattered data from different sections suggest that its first entry, associated with the emergence of other plicate spiriferids, such as theodossid and conispiriferid brachiopods, was late in the Middle Frasnian. At the same time, many rhynchonellids disappeared or became extinct locally in South China. This brachiopod faunal overturn near the Palmatolepis punctata–Early Pa. hassi zonal boundary is the most significant event in the Early–Middle Frasnian of South China, characterized by about a 35% loss of existing species and the flourishing of the plicate spiriferids, which was coeval with the end of a major biogeochemical perturbation recently recognized in the Pa. punctata Zone. By contrast, atrypid brachiopods do not seem to show any significant diversity change. The brachiopod faunal change was probably related to a (local?) transgressive event in South China, which also brought new pelagic faunas northwards into some intra−shelf deeper water areas, such as the Shetianqiao area in central Hunan Province. Fifteen brachiopod species are described and illustrated, which include some taxa that are first recorded or recognized in South China, e.g., the spiriferid Pyramidaspirifer, which is now known from both North America and South China. One new species, Desquamatia qiziqiaoensis, is erected.
    Źródło:
    Acta Palaeontologica Polonica; 2006, 51, 4; 789-812
    0567-7920
    Pojawia się w:
    Acta Palaeontologica Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of a high-resolution real-time-capable 3D SONAR camera for deep sea operation
    Autorzy:
    Ehrhardt, M.
    Becker, F. J.
    Speicher, D.
    Fonfara, H.
    Hewener, H.
    Degel, C.
    Tretbar, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/332135.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    2D array
    matrix array
    3D imaging
    beamforming
    Opis:
    Within this work we present a first experimental setup of a high-resolution real-timecapable 3D sonar camera system for deep sea operation. Since we are currently in the development process, the focus of this work is on the transmission aspects of the camera. Following publications will include the receiving aspects as well as the first phantom reconstructions. The system consists of a 1024 element matrix array antenna, together with a 128 channel beamforming system including a 1:8 multiplexing device for each channel. The camera is supposed to deliver volumetric images within a range of up to 15 m in a deep sea environment up to 6000 m depth. The antenna provides the advantage of an adjustable defocused transmitting sound field. This allows dynamic control of the field of view, and an increase of the image contrast for a specific region.
    Źródło:
    Hydroacoustics; 2016, 19; 101-110
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prediction of the shape accuracy of parts fabricated by means of FLM process using FEM simulations
    Autorzy:
    Möhring, H.-Christian
    Stehle, Thomas
    Maucher, Clemens
    Becker, Dina
    Braun, Steffen
    Powiązania:
    https://bibliotekanauki.pl/articles/99674.pdf
    Data publikacji:
    2019
    Wydawca:
    Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
    Tematy:
    additive manufacturing
    FLM-simulation
    shape accuracy
    Opis:
    The prediction of component properties from the Additive manufacturing (AM) process poses a challenge. Therefore, this paper presents the development of a novel machine data (G-Code) based procedure as well as its programming implementation of a process simulation in ANSYS Mechanical for the fused layer modelling (FLM) process. For this purpose, an investigation of additively produced components with varying parameters made of polylactic acid (PLA) is carried out and simulated by means of the developed method. Application of the developed method makes it possible to predict the thermally induced distortion of PLA-Parts based on the machine data from the FLM process before production.
    Źródło:
    Journal of Machine Engineering; 2019, 19, 1; 114-127
    1895-7595
    2391-8071
    Pojawia się w:
    Journal of Machine Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations on the acoustic optimisation of a variable displacement pump using virtual prototypingOptymalizacja akustyczna pompy o zmiennej objetości za pomocą wirtualnego prototypowania
    Autorzy:
    Becker, K.
    Fassbender, A.
    Nied-Menninger, T.
    Sickert, D.
    Siebertz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/374900.pdf
    Data publikacji:
    2009
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    pompy
    wirtualne prototypowanie
    pompy wspomagające
    pump
    virtual prototyping
    steering pumps
    Opis:
    n modern vehicles the steering systems are still widely equipped with power-assisted steering pumps. In most cases vane pumps are used which limit the fluid volume flow in dependence of required pressure and running speed by a special design of the internal control valve. This control valve internally redirects the volume flow inside the pump leading still to unnecessary fluid circulation. Variable displacement pumps now offer an additional opportunity to eliminate the internal volume flow in dependence of the required load with reduced losses and hence increased efficiency. This is realized by a variable adjustment of the displacement cells, but simultaneously the variable force and load distributions inside the pump make the acoustic optimization even more difficult. In this paper the kinematics of the vane pump are modelled with a combined analytical and numerical approach. The data out of this model are used as input data for the hydraulic model of the variable displacement vane pump with a commercial tool. Both models are validated with data from test rig investigations. With this validated virtual prototype different design options are developed and finally successfully investigated on a test rig and in a passenger vehicle.
    W nowoczesnych pojazdach układy kierownicze obecnie wyposażane są w pompy wspomagająjce. W wielu przypadkach pompy te ograniczają objętościowe natężenie przepływu w zależności od ciśnienia i prędkości obrotowej za pomocą specjalnego zaworu regulacyjnego. Zawór ten ustala przepływ wewnątrz pompy, powodując niepożądane cyrkulacje rzeczy. Pompy o zmiennej objętości zapewniają obecnie dodatkowe korzyści dostosowując przepływ wewnątrz w zależnożci od obciążenia przy zapewnieniu mniejszych strat i większej sprawności. Jest to realizowane przez regulacje zmian objętosci komór, jednakże jednoczesne zmiany sił i rozkładu obciążenia wewnątrz pompy sprawiają, że proces jej optymalizacji akustycznej jest bardzo trudny. W artykule przedstawiono kinetyczny model wraz z jego analitycznym i numerycznym opisem. Dane wyjściowe tego modelu wykorzystano jako dane wejściowe do modelu hydraulicznego pompy o zmiennej objętości, utworzonego za pomocą standardowych narzędzi. Oba modele zweryfikowano za pomocą danych ze stanowiska badawczego. W wyniku tej weryfikacji opracowano różne warianty konstrukcji pomp, które następnie przebadano na stanowisku badawczym i w samochodzie osobowym.
    Źródło:
    Transport Problems; 2009, T. 4, z. 3, cz.2; 59-68
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface Chemistry of Zirconia Nanopowders Doped with $Pr_2O_3$: an XPS Study
    Autorzy:
    Suchorski, Y.
    Wrobel, R.
    Becker, S.
    Opalińska, A.
    Narkiewicz, U.
    Podsiadly, M.
    Weiss, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811498.pdf
    Data publikacji:
    2008-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    79.60.-i
    61.46.-w
    61.46.Hk
    Opis:
    Zirconia nanopowders of tetragonal crystallographic structure doped with $Pr_2O_3$ were prepared by the microwave-assisted hydrothermal synthesis and coprecipitation method. The surface compositions were studied by X-ray photoelectron spectroscopy. The nanopowder particles appear to be inhomogeneous in their structure: for the surface region an enrichment with praseodymium is detected by X-ray photoelectron spectroscopy measurements. This allows the assumption of a core-shell-like structure of single nanopowders particles. The X-ray photoelectron spectroscopy studies confirm also $Zr^{4+}$ and $Pr^{3+}$ as main oxidation states of zirconium and praseodymium in the studied compounds.
    Źródło:
    Acta Physica Polonica A; 2008, 114, S; S-125-S-134
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Guidelines for the coordinated enhancement of the maritime position, navigation and time data system
    Autorzy:
    Engler, E.
    Hoppe, M.
    Ritterbusch, J.
    Ehlers, T.
    Becker, C.
    Ehrke, K.-C.
    Callsen-Bracker, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/135132.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    standardized PNT data products
    guidelines
    requirements
    scalability
    integrity
    reliability
    resilience
    Opis:
    Reliable knowledge of a ship’s position and movement in relation to other traffic participants and obstacles is a fundamental requirement for navigation and avoiding collisions and groundings. Consequently, the onboard provision of resilient position, navigation and time data (PNT) is emphasized by the International Maritime Organization’s (IMO) e-navigation strategy, solution S3 “Improved reliability, resilience and integrity of bridge equipment and navigation information” and by the assigned risk control option RCO5 “Improved reliability and resilience of onboard PNT systems”. An initial step towards resilient PNT has been realized by the maritime community with the development of the performance standards for shipborne multi-system radionavigation receiver equipment (MRR). This MRR performance standard (PS) supports the full use of data coming from current and future radionavigation systems and services. Consequently, the combined use of several global navigation satellite systems (GNSS) and the additional use of space based augmentation systems (SBAS) as well as optional terrestrial radionavigation systems (e.g. eLoran or R-Mode) will be supported to increase the performance of positioning and timing. As a second step, the development of guidelines for an onboard PNT (data processing) unit has been identified as supplementary and necessary. The starting point is the onboard use of a combination of GNSS receivers and autarkic systems (e.g. radar, gyro, echosounders with bathymetric data) for a comprehensive provision of required PNT data. Redundancy in the available data enables the application of integrity monitoring functions to evaluate the current usability of safety-critical data and components. The aim of the guidelines is the specification of data processing rules towards the resilient provision of standardized PNT data and integrity information. For this purpose, a modular architecture for an onboard PNT system is introduced and scaled to the need for data input as well as the performance of data output.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 45 (117); 44-53
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical Properties and Microstructure of InGaN Grown by Molecular Beam Epitaxy
    Autorzy:
    Böttcher, T.
    Einfeldt, S.
    Figge, S.
    Kirchner, V.
    Hommel, D.
    Selke, H.
    Ryder, P. L.
    Bertram, F.
    Riemann, T.
    Christen, J.
    Lunz, U.
    Becker, C. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969025.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.35.Dv
    68.65.+g
    78.20.-e
    78.55.-m
    78.55.Cr
    Opis:
    The luminescence of In$\text{}_{x}$Ga$\text{}_{1-x}$N is studied for thick epitaxial layers and quantum wells. Using spatially resolved cathodoluminescence spectroscopy the commonly observed broad integral photoluminescence spectra were found to result from spectral and lateral inhomogeneous emission across the samples. Moreover, the integral photoluminescence and absorption spectra show different temperature dependences. The effects can be explained assuming fluctuations of the composition associated with a variation of the band gap.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 260-264
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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