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    Wyświetlanie 1-7 z 7
    Tytuł:
    Detection of Shallow Dislocations on 4H-SiC Substrate by Etching Method
    Autorzy:
    Ishikawa, Y.
    Yao, Y.
    Sato, K.
    Sugawara, Y.
    Danno, K.
    Suzuki, H.
    Bessho, T.
    Kawai, Y.
    Shibata, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/1492539.pdf
    Data publikacji:
    2011-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.72.uj
    81.65.Cf
    68.37.Lp
    Opis:
    Correlation between dislocation types in epitaxial 4H-SiC and etch pit types on the 4H-SiC wafer surface were investigated by etch pit method and transmission electron microscope. Shallow dislocation on the wafer was found to form round pit without core. The shallow dislocation was estimated half-loop type in wafer and this estimation explains that step-flow growth converts half-loop dislocation into complex dislocation composed by threading dislocation and basal plane dislocation.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 6A; A-025-A-027
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    HRTF Adjustments with Audio Quality Assessments
    Autorzy:
    Yao, S. N.
    Chen, L. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/950215.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    HRTF
    PEAQ
    cone of confusion
    headphones
    surround
    Opis:
    There are an increasing number of binaural systems embedded with head-related transfer functions (HRTFs), so listeners can experience virtual environments via conventional stereo loudspeakers or head- phones. As HRTFs vary from person to person, it is difficult to select appropriated HRTFs from already existing databases for users. Once the HRTFs in a binaural audio device hardly match the real ones of the users, poor localization happens especially on the cone of confusion. The most accurate way to obtain personalized HRTFs might be doing practical measurements. It is, however, expensive and time consuming. Modifying non-individualized HRTFs may be an effort-saving way, though the modifications are always accompanied by undesired audio distortion. This paper proposes a flexible HRTF adjustment system for users to define their own HRTFs. Also, the system can keep sounds from suffering intolerable distortion based on an objective measurement tool for evaluating the quality of processed audio.
    Źródło:
    Archives of Acoustics; 2013, 38, 1; 55-62
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Driver Filter Design for Software-Implemented Loudspeaker Crossovers
    Autorzy:
    Yao, S. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/176429.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    crossover
    loudspeaker
    pole-zero placement
    Pascal matrix
    driver filter
    Opis:
    A hybrid method is presented for the integration of low-, mid-, and high-frequency driver filters in loud- speaker crossovers. The Pascal matrix is exploited to calculate denominators; the locations of minimum values in frequency magnitude responses are associated with the forms of numerators; the maximum values are used to compute gain factors. The forms of the resulting filters are based on the physical meanings of low-pass, band-pass, and high-pass filters, an intuitive idea which is easy to be understood. Moreover, each coefficient is believed to be simply calculated, an advantage which keeps the software- implemented crossover running smoothly even if crossover frequencies are being changed in real time. This characteristic allows users to efficiently adjust the bandwidths of the driver filters by subjective listening tests if objective measurements of loudspeaker parameters are unavailable. Instead of designing separate structures for a low-, mid-, and high-frequency driver filter, by using the proposed techniques we can implement one structure which merges three types of digital filters. Not only does the integra- tion architecture operate with low computational cost, but its size is also compact. Design examples are included to illustrate the effectiveness of the presented methodology.
    Źródło:
    Archives of Acoustics; 2014, 39, 4; 591-597
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Head-Related Transfer Function Selection Using Neural Networks
    Autorzy:
    Yao, S.-N.
    Collins, T.
    Liang, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/176307.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    head-related transfer function
    neural networks
    localisation
    music
    audio
    anthropometry
    pinna
    Opis:
    In binaural audio systems, for an optimal virtual acoustic space a set of head-related transfer functions (HRTFs) should be used that closely matches the listener’s ones. This study aims to select the most appropriate HRTF dataset from a large database for users without the need for extensive listening tests. Currently, there is no way to reliably reduce the number of datasets to a smaller, more manageable number without risking discarding potentially good matches. A neural network that estimates the appropriateness of HRTF datasets based on input vectors of anthropometric measurements is proposed. The shapes and sizes of listeners’ heads and pinnas were measured using digital photography; the measured anthropometric parameters form the feature vectors used by the neural network. A graphical user interface (GUI) was developed for participants to listen to music transformed using different HRTFs and to evaluate the fitness of each HRTF dataset. The listening scores recorded were the target outputs used to train the neural networks. The aim was to learn a mapping between anthropometric parameters and listener’s perception scores. Experimental validations were performed on 30 subjects. It is demonstrated that the proposed system produces a much more reliable HRTF selection than previously used methods.
    Źródło:
    Archives of Acoustics; 2017, 42, 3; 365-373
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rozkład stężenia objętościowego cząstek stałych w przekroju poprzecznym kwadratowego przewodu podczas hydrotransportu mieszaniny gruboziarnistej
    Distribution of solid volume concentration in the cross-section of a square conduit during hydrotransport of a coarse mixture
    Autorzy:
    Yao, N.
    Qiu, H.
    Xia, J.
    Sobota, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/236824.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
    Tematy:
    hydrotransport
    mieszanina gruboziarnista
    rozkład stężenia cząstek
    przekrój kwadratowy
    core mixtures
    particle concentration distributions
    square cross section
    Opis:
    Na podstawie analizy sił działających podczas przepływu mieszaniny ciecz-cząstki piasku oraz wprowadzając parametr k, uzyskano formułę do obliczania położenia strefy maksymalnego stężenia objętościowego cząstek stałych w pionowej osi przekroju poprzecznego przewodu. Formuła została ustalona na podstawie badań przepływu mieszaniny gruboziarnistej o stężeniu objętościowym 5%, zawierającej ziarna piasku o średnicach 0,5 mm, 1,0 mm lub 3,0 mm, w przewodzie o przekroju kwadratowym (50 mm×50 mm), przy trzech prędkościach przepływu – 1,5 m/s, 2,0 m/s i 2,5 m/s. Profile stężenia cząstek w przekroju poprzecznym przewodu określono wykorzystując metodę PIV (particle image velocimetry). Weryfikacja zaproponowanej formuły, otrzymanej na podstawie wyników badań przepływu w przewodzie kwadratowym wykazała, że z wystarczającą dokładnością może być ona stosowana do analizy hydrotransportu mieszanin gruboziarnistych w rurociągach.
    A formula for calculating the location of maximum solid particle volume concentration zone on the vertical axis of the transverse conduit profile was obtained from analysis of forces acting during the flow of liquid-sand particle mixture as well as by the parameter k introduction. The formula was determined on the basis of flow test results for the 5% coarse mixture (vol.) containing sand grains of 0.5 mm, 1.0 mm and 3.0 mm in diameter in a 50 × 50 mm square conduit, at three flow velocities: 1.5 m/s, 2.0 m/s and 2.5 m/s. The transverse concentration profiles were measured using the PIV (particle image velocity) method. Verification of the proposed formula, obtained from the results of the flow tests in the square conductors, showed that with sufficient accuracy it can be applied to the analysis of coarse mixture flows in the pipelines.
    Źródło:
    Ochrona Środowiska; 2018, 40, 3; 47-52
    1230-6169
    Pojawia się w:
    Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of rainfall trends on flood in Agnéby watershed
    Autorzy:
    Konin, N’Da Jean Claude
    N’go, Yao Alexis
    Soro, Gneneyougo Emile
    Goula, Bi Tié Albert
    Powiązania:
    https://bibliotekanauki.pl/articles/2073726.pdf
    Data publikacji:
    2022
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    Agnéby watershed
    flood
    hydro-rainfall hazard
    Ivory Coast
    rainfall trend
    Opis:
    The aim of this study is to analyse the spatio-temporal evolution of hydro-rainfall variables in the Agnéby watershed in a disturbed climatic context. Rainfall data from the stations of Arrah, Bongouanou, M’Batto, Akoupé, Céchi, Agboville, Adzopé, Sikensi, Abidjan Airport and Dabou as well as hydrometric data from the stations of Agboville, Offoliguié, M’Bessé and Guessiguié were used. The methodological approach is based on the application of independence and trend tests and spatio-temporal analysis of daily rainfall maxima, duration of consecutive rainfall events, number of rainfall events above a threshold and daily flow maxima. The hypothesis of independence justified the relevance of the choice of variables. The trend test showed the dynamic upward evolution of extreme rainfall and the decrease in the duration of consecutive rainy episodes, in the number of rainy episodes and in the flows feeding the main watercourse. Moreover, spatial analysis of daily maximum rainfall amounts above 120 mm, consecutive maximum rainfall amounts above 160 mm and Gumbel rainfall amounts above 190 mm indicated heavy rainfall in the southern part of the watershed. However, a decrease in rainfall is recorded in the areas covered by the stations of Arrah, Bongouanou, M’Batto, Ce chi and Akoupé. An increase in the flood flow calculated from the Generalized Extreme Value (GEV) between 76.60 m3∙s-1 and 225.70 m3∙s-1 is presented in the main river. The spatio-temporal variation in annual rainfall heights showed a high rainfall in the southern part of the watershed with a decrease in rainfall over the decades (1976-1985 and 1996-2005) followed by an increase over the decades (1986-1995 and 2006-2015). Despite the general decrease in rainfall, extreme rainfall has become frequent, causing flooding in the watershed.
    Źródło:
    Journal of Water and Land Development; 2022, 52; 9--20
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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