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Wyszukujesz frazę "Ludwig, W." wg kryterium: Autor

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    Tytuł:
    Impact of friction coefficient on particles circulation velocity calculated by euler-lagrange model in spouted bed apparatus for dry coating
    Autorzy:
    Ludwig, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/297983.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    spout-fluid bed
    friction coefficient
    restitution coefficient
    Euler-Lagrange approach
    Opis:
    This paper is a continuation of research concerning gas-solid flow modelling using the Euler-Lagrange approach in a spout-fluid bed apparatus. The major challenge in this case was to determine the friction coefficient for particles hitting against the walls of the apparatus. On the basis of the properties of similar materials the value of this quantity was estimated at 0.2. Therefore, it proved useful to check the model’s sensitivity to the value of this parameter. The study investigated the effect of friction coefficient on calculated values of particles velocity in the draft tube and the annular zone of the device for various volumes of the circulating bed. In the course of calculations, a relatively small influence of friction coefficient on particles velocity was observed in the tested zones of the apparatus. The changes were most visible for large volumes of the bed, which was connected with an increase in the number of collisions of particles with the walls.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(4); 303-321
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modification of a recuperator construction with CFD methods
    Autorzy:
    Ludwig, W.
    Zając, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/185215.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    recuperator
    modification
    CFD
    gas flow
    rekuperator
    modyfikacja
    przepływ gazu
    Opis:
    The purpose of the work was initial modification of the construction of a commercially produced heat exchanger – recuperator with CFD (computational fluid dynamics) methods, based on designs and process parameters which were provided. Uniformity of gas distribution in the space between the tubes of the apparatus as well as the pressure drop in it were taken as modification criteria. Uniformity of the gas velocity field between the tubes of the heat exchanger should cause equalization of the local individual heat transfer coefficient values and temperature value. Changes of the apparatus construction which do not worsen work conditions of the equipment, but cause savings of constructional materials (elimination or shortening some parts of the apparatus) were taken into consideration.
    Źródło:
    Chemical and Process Engineering; 2017, 38, 4; 567-576
    0208-6425
    2300-1925
    Pojawia się w:
    Chemical and Process Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of cores electrification during the flow in the modified Wurster apparatus
    Autorzy:
    Ludwig, W.
    Mączka, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/297903.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie
    Tematy:
    electrification
    cores
    Wurster
    spout-fluid bed
    Opis:
    The purpose of this paper was presentation of the value of cores electrification during their flow in the modified Wurster apparatus, applied for dry encapsulation of pharmaceutical materials. Previous works of the authors dealt with vulnerability of the particles of different diameter, produced by SYNTAPHARM (Cellets 1000, 700 and 100) on electrification in laboratory conditions. The presented work gives the results of examination on particles electrification in real conditions of their stable circulation in a column. The measurement system, that was applied, allowed determination of electrification potential and electrification current. Those quantities, which are the measures of charge accumulation on cores were determined for several particles (Cellets 1000, 700 and 500) with the different humidity, for different mass of the bed and spouting gas velocities.
    Źródło:
    Technical Sciences / University of Warmia and Mazury in Olsztyn; 2017, 20(1); 5-15
    1505-4675
    2083-4527
    Pojawia się w:
    Technical Sciences / University of Warmia and Mazury in Olsztyn
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extraction of organic impurities using 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6]
    Autorzy:
    Koźlecki, T.
    Sawiński, W.
    Sokołowski, A.
    Ludwig, W.
    Polowczyk, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/778267.pdf
    Data publikacji:
    2008
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    ekstrakcja ciecz-ciecz
    ciecze jonowe
    oczyszczanie ścieków przemysłowych
    liquid-liquid extraction
    ionic liquids
    industrial wastewater purification
    Opis:
    Extraction of several chloro compounds from water has been examined. As the extracting liquid the 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6], which is common hydrophobic ionic liquid, was used. Additionally, extraction of selected chlorinated compounds from tert-butylmethylether (MTBE) was investigated. The obtained results show the usefulness of [BMIM][PF6] to remove the organic impurities from water, particularly at the concentration range inappropriate for biological purification plants.
    Źródło:
    Polish Journal of Chemical Technology; 2008, 10, 1; 79-83
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary research on application of virtual reality as optical stimulation in videonystagmography
    Autorzy:
    Kostorz, I.
    Kowalski, W.
    Ludwig, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/333211.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    videonystagmography
    virtual reality
    optokinetic stimulation
    wideonystagmografia
    rzeczywistość wirtualna
    stymulacja optokinetyczna
    Opis:
    The paper presents a research on the utilization of a virtual reality as means of stimulation during a videonystagmography examination. The main aim of the research was to test whether an optical stimulation generated by means of virtual reality presented in a helmet-mounted display is applicable to the videonystagmography examination. Eye position was recorded by an infrared camera mounted in virtual reality head-set. Visual stimulations were first performed on a LCD display mounted in VR goggles and then on a LCD monitor. Tracking of a moving field was a subject's task. Target horizontal and vertical jumps were used for calibration. Visual stimuli applied were pendulum target movement and moving vertical stripes. The results of tests showed that pupil positions registered during the virtual stimulation were consistent with those registered during the traditional stimulation.
    Źródło:
    Journal of Medical Informatics & Technologies; 2018, 27; 9-20
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Investigations of Chondritic Meteorites by X-ray Diffraction and Mössbauer Effect Methods
    Autorzy:
    Ludwig, A.
    Zarek, W.
    Popiel, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028985.pdf
    Data publikacji:
    2001-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    61.18.Fs
    Opis:
    The Mössbauer spectroscopy and X-ray diffraction techniques were used to investigate the mineral and magnetic fractions of two meteorites: carbonaceous chondrite named Allende (CV3) and ordinary chondrite - El Hammami (H5). The investigations of a powder mixture of chondrules and matrix show that the meteorites studied contain iron mainly in the silicates, olivine, and pyroxene. The metallic fractions of the El Hammami meteorite contain the ferromagnetic mineral kamacite (bcc iron-nickel alloy). This phase with cubic symmetry was identified by symmetric Mössbauer spectrum with disturbance in relative line intensities. The results suggest that the Allende meteorite does not contain a pure metallic phase.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 5; 761-765
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on utilization of virtual reality as optical stimulation in electronystagmography
    Autorzy:
    Kostorz, I.
    Kowalski, W.
    Ludwig, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/333259.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    electronystagmography
    virtual reality
    optokinetic stimulation
    elektronystagmografia
    rzeczywistość wirtualna
    stymulacja optokinetyczna
    Opis:
    The paper presents a research on the utilization of an up-to-date virtual reality set as a stimulation during an electronystagmography examination. The main aim of the research was to test whether an optical stimulation generated by means of virtual reality presented in a helmet-mounted display is comparable with the same methods of stimulation generated in a human natural environment. The experiments were conducted using an amplifier of electronystagmography signals, an acquisition software and the Oculus Development Kit 2 virtual reality set. As traditional stimuli were used animations displayed on the LCD monitor screen. The electronystagmograms registered with a virtual optokinetic stimulation were compared with results obtained using traditional stimulating methods. Additionally, a questionnaire on comfort was conducted among participants of the experiment. To asses the similarity of signals registered using both methods the Pearson correlation coefficient was calculated and the standard deviation. The results of tests showed that electronystagmograms registered during the virtual stimulation were consistent with the records registered during the traditional stimulation. Moreover, the results of the questionnaire on comfort while using a virtual reality headset are very encouraging showing that headset is at least neutral for participants.
    Źródło:
    Journal of Medical Informatics & Technologies; 2016, 25; 9-18
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Detection of waves of Auditory Brainstem Responses using IPAN99 algorithm
    Autorzy:
    Kostorz, I.
    Kowalski, W.
    Ludwig, Z.
    Zając, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/333280.pdf
    Data publikacji:
    2013
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    auditory brainstem responses
    IPAN99 algorithm
    słuchowe potencjały wywołane pnia mózgu
    algorytm IPAN99
    Opis:
    The new method of automatic determination the I, III and V waves of Auditory Brainstem Responses is presented in the paper. The brainstem response arises as a result of acoustic stimulation of auditory system. The main aim of the presented study is to analyse an effectiveness of using IPAN99 algorithm for automatic wave I, III and V determination. The presented results of research show that the IPAN99 algorithm combined with time domain constraints can be useful for this application.
    Źródło:
    Journal of Medical Informatics & Technologies; 2013, 22; 219-225
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Magnetic Properties of Semiconductor-Antiferromagnet Superlattices
    Autorzy:
    Wilamowski, Z.
    Buczko, R.
    Jantsch, W.
    Ludwig, M.
    Springholz, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952426.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    75.50.Ee
    75.50.Pp
    76.50.+g
    Opis:
    Magnetic resonance investigations of ultra-thin antiferromagnetic EuTe layers show a specific behaviour in the quasi-2D antiferromagnetic ordering: (i) an anisotropy of the critical broadening, (ii) a substantial increase in the Néel temperature and (iii) an anisotropic shift of the resonance frequency which diverges at the Néel point. The results show that exchange coupling is stronger in quasi-2D than in 3D antiferromagnetic samples and that correlation of spin chains aligned in the perpendicular direction occurs already well above the Néel point.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 973-976
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A preliminary study of the utilization of a low resolution ECG signal from handheld ECG monitor
    Autorzy:
    Kostorz, I.
    Kowalski, W.
    Ludwig, Z.
    Zając, J.
    Piasecki, A.
    Socha, M.
    Górka, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/332853.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Śląski. Wydział Informatyki i Nauki o Materiałach. Instytut Informatyki. Zakład Systemów Komputerowych
    Tematy:
    ECG signal analysis
    low resolution signals
    handheld monitor
    telemedicine
    analiza sygnału EKG
    sygnały o niskiej rozdzielczości
    monitor przenośny
    telemedycyna
    Opis:
    The paper presents the preliminary study of the utilization of a low resolution ECG signal analysis. The analysis was performed on the signals obtained from a hand-held ECG monitor usually used in primary health care. The aim. The main aim of the study was a registration of series of data by volunteers within couple of months and determination of signal quality and main ECG parameters as follows: Q, R, S waves, QRS duration as well as the end of PQ and the beginning of ST segment. Additionally, the heart rate variability was determined. Materials and methods. The data was registered by 12 volunteers aged from 35 to 55. The ECG tests were carried out for 7 months. The sample rate of the signal was 100 Hz. To determine the ECG parameters the signal processing and statistical methods was used. Results. The sensitivity of the following ECG parameters were: R wave detection - 99,2 %, Q wave detection - 99,1 %, S wave detection - 99,0 %, QRS duration - 99,2 % respectively.
    Źródło:
    Journal of Medical Informatics & Technologies; 2015, 24; 191-198
    1642-6037
    Pojawia się w:
    Journal of Medical Informatics & Technologies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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