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    Wyświetlanie 1-11 z 11
    Tytuł:
    Settling Time Testing of Fast DACs
    Autorzy:
    Kvedaras, R.
    Kvedaras, V.
    Ustinavicius, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1505231.pdf
    Data publikacji:
    2011-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Dz
    07.05.Hd
    07.05.Kf
    07.05.Tp
    Opis:
    New specialized sampling converter for signal timescale transformation and algorithm of digital signal processing for automated measurement of settling times of fast digital-to-analogue converters is represented. The new sampling device with numerically controlled oscillators allows us realization of different types of the timescale transformation. Usage of ΣΔ analogue-to-digital converter and first-in first-out memory allows us significant simplification of the device. The equations of timescale transformation ratio and sampling step are presented. A method using a brick-wall comb filter in frequency domain to filter measurement signal has been developed. It is shown that such filtering allows us significant reduction of noise of measurement signal. A new method and algorithm using a brick-wall comb filter and averaging of filtered signal has been developed. Results of the research of developed digital signal processing algorithm are submitted.
    Źródło:
    Acta Physica Polonica A; 2011, 119, 4; 521-527
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Role of Emotional Variables in the Classification and Prediction of Collective Social Dynamics
    Autorzy:
    Chołoniewski, J.
    Sienkiewicz, J.
    Hołyst, J.
    Thelwall, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1388316.pdf
    Data publikacji:
    2015-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.50.-r
    07.05.Hd
    89.20.Hh
    Opis:
    We demonstrate the power of data mining techniques for the analysis of collective social dynamics within British Tweets during the Olympic Games 2012. The classification accuracy of online activities related to the successes of British athletes significantly improved when emotional components of tweets were taken into account, but employing emotional variables for activity prediction decreased the classifiers' quality. The approach could be easily adopted for any prediction or classification study with a set of problem-specific variables.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 3A; A-21-A-28
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability and Performance Characteristics of a Digital Positron Lifetime Spectrometer
    Autorzy:
    Aavikko, R.
    Rytsölä, K.
    Nissilä, J.
    Saarinen, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2042175.pdf
    Data publikacji:
    2005-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    06.60.Jn
    07.05.Hd
    78.70.Bj
    07.85.Nc
    Opis:
    We summarize the setup and performance tests of a digital positron lifetime spectrometer presently in routine use at HUT/Laboratory of Physics. The performance of the spectrometer is found to be equal to or better than that of an analog spectrometer with similar detectors. We present also results on measuring the stability of the system, which is found to be similar to that of analog spectrometers: variation in the time-zero of the spectrometer is found to be ≈10 ps/week. We suggest that the remaining instabilities of the spectrometers originate primarily from the detectors.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 4; 592-597
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design of a Single Line Half Duplex Protocol for Mechanical Rotary Table Systems
    Autorzy:
    Ozkan, S.
    Atali, G.
    Boru, B.
    Karayel, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031133.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    07.05.Hd
    07.50.-e
    89.70.Hj
    07.05.Dz
    45.80.+r
    Opis:
    In this study, a new communication protocol, which addresses the rotary table, has been designed. Developed system works over a single line and is using slip rings. The designed communication protocol ensures the half duplex communication for multiple stations over a single cable. During the protocol design, media access methods, coding techniques and multi-node synchronization techniques were examined. These techniques have been adapted, updated and combined for the study, during the formation of the communication protocol. The designed protocol was tested and verified in the simulation environment with original software, on the microcontrollers. The protocol is aimed to be open source, flexible, easily applicable and a new solution for the distributed control problems in the field of automation and for the rotary table systems in particular.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 749-752
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Emotional Analysis of Blogs and Forums Data
    Autorzy:
    Weroński, P.
    Sienkiewicz, J.
    Paltoglou, G.
    Buckley, K.
    Thelwall, M.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1408915.pdf
    Data publikacji:
    2012-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.50.-r
    07.05.Hd
    89.20.Hh
    89.70.Cf
    Opis:
    We perform a statistical analysis of emotionally annotated comments in two large online datasets, examining chains of consecutive posts in the discussions. Using comparisons with randomised data we show that there is a high level of correlation for the emotional content of messages.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 2B; B-128-B-132
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical Analysis of Emotions and Opinions at Digg Website
    Autorzy:
    Pohorecki, P.
    Sienkiewicz, J.
    Mitrović, M.
    Paltoglou, G.
    Hołyst, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1400182.pdf
    Data publikacji:
    2013-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.50.-r
    07.05.Hd
    89.20.Hh
    89.70.Cf
    Opis:
    We performed statistical analysis on data from the Digg.com website, which enables its users to express their opinion on news stories by taking part in forum-like discussions as well as to directly evaluate previous posts and stories by assigning so called "diggs". Owing to fact that the content of each post has been annotated with its emotional value, apart from the strictly structural properties, the study also includes an analysis of the average emotional response of the comments about the main story. While analysing correlations at the story level, an interesting relationship between the number of diggs and the number of comments that a story received was found. The correlation between the two quantities is high for data where small threads dominate and consistently decreases for longer threads. However, while the correlation of the number of diggs and the average emotional response tends to grow for longer threads, correlations between numbers of comments and the average emotional response are almost zero. We also suggest presence of two different mechanisms governing the evolution of the discussion and, consequently, its length.
    Źródło:
    Acta Physica Polonica A; 2013, 123, 3; 604-615
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of EGNOS-Augmented GPS Receiver Positioning Accuracy
    Autorzy:
    Skorkowski, A.
    Topór-Kamiński, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417964.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.10.Pr
    89.20.Hh
    06.20.Dk
    07.05.Hd
    Opis:
    This study presents the operation basis of GPS global positioning system and augmentation systems used to increase positioning accuracy. Furthermore, selected measurement results for an EGNOS-augmented GPS receiver positioning are included along with an analysis of GIS measurements accuracy, performed using differential corrections. This analysis takes into consideration the impact of the number of measurement series and satellite constellation on the accuracy of positioning achieved in praxis using the EGNOS system.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 821-824
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selected Methods of Measuring the Delay in Data Transmission Systems with Wireless Network Interfaces
    Autorzy:
    Topor-Kaminski, T.
    Żurkowski, R.
    Grygiel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1493274.pdf
    Data publikacji:
    2011-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    43.10.Pr
    89.20.Hh
    06.20.-f
    06.20.Dk
    07.05.Hd
    Opis:
    The article presents the concept of creating model of delays occurring in telecommunication system taking into account all sources of delays generated during data transmission between the source and destination nodes. Proposed model takes into account the existence of intermediary network devices that play a significant role in the general delay budget. The paper presents two measurement systems used to measure delays in 802.11 g based wireless networks and ones using ZigBee standard. Both systems were built based on the authors' concepts of hardware and software allowing measurement of delays by using additional connection for the synchronization of internal clocks. Described measurement systems selected amount of experiments was performed for varied network structures.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 4; 748-754
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Ga$\text{}_{2}$O$\text{}_{3}$ Nanobelts Synthesized by the Thermal Annealing of GaN Powders
    Autorzy:
    Kim, Hyoun Woo
    Kim, Nam Ho
    Powiązania:
    https://bibliotekanauki.pl/articles/2041772.pdf
    Data publikacji:
    2005-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.07.-b
    81.05.Hd
    Opis:
    We synthesized the uniform monoclinic gallium oxide (Ga$\text{}_{2}$O$\text{}_{3}$) nanobelts by a simple thermal annealing of GaN powders. The as-syn-thesized nanobelts were rectangular in cross-sectional shape with width ranging from 100 to 700 nm. The length direction of the nanobelt was along [010]. Photoluminescence measurement under excitation at 325 nm showed that the Ga$\text{}_{ }$2O$\text{}_{3}$ nanobelts had a blue emission at around 454 nm.
    Źródło:
    Acta Physica Polonica A; 2005, 107, 2; 346-350
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanochemically Synthesized CuFeSe₂ Nanoparticles and Their Properties
    Autorzy:
    Dutková, E.
    Škorvánek, I.
    Sayagués, M.
    Zorkovská, A.
    Kováč, J.
    Baláž, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032137.pdf
    Data publikacji:
    2017-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Hd
    81.07.Wx
    81.20.Wk
    Opis:
    The mechanochemical synthesis of nanocrystalline CuFeSe₂ particles prepared by high-energy milling in a planetary mill in an argon atmosphere from copper, iron, and selenium for 60 min is reported for the first time. The CuFeSe₂ nanoparticles crystallize in tetragonal structure with mean crystallite size of about 32±1 nm. High resolution transmission electron microscopy measurements confirmed the presence of agglomerates which are formed by small nanocrystalline domains (5-40 nm). The magnetic data revealed that paramagnetic CuFeSe₂ nanoparticles coexist with a small amount of ferromagnetic impurities at room temperature. The magnetic transition towards a weak ferromagnetic or ferrimagnetic behavior occurs in CuFeSe₂ at approximately 79 K. The band gap of the CuFeSe₂ particles is 0.95 eV which is wider than the band gap in bulk materials (0.16 eV), which could be in many aspects of application more beneficial.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 4; 1156-1158
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanochemically Synthesized Nanocrystalline $Sb_2S_3$ Particles
    Autorzy:
    Dutková, E.
    Sayagués, M.
    Real, C.
    Zorkovská, A.
    Baláž, P.
    Šatka, A.
    Kováč, J.
    Ficeriová, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1375343.pdf
    Data publikacji:
    2014-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Hd
    81.07.Bc
    81.20.Wk
    Opis:
    Nanocrystalline $Sb_2S_3$ particles have been synthesized from Sb and S powders by high-energy milling in a planetary mill using argon protective atmosphere. X-ray diffraction, particle size analysis, scanning electron microscopy, energy dispersive X-ray spectroscopy, transmission electron microscopy, electron diffraction, high resolution transmission electron microscopy, UV-VIS, and differential scanning calorimetry methods for characterization of the prepared particles were applied. The powder X-ray diffraction pattern shows that $Sb_2S_3$ nanocrystals belong to the orthorhombic phase with calculated crystallite size of about 36 nm. The nanocrystalline $Sb_2S_3$ particles are constituted by randomly distributed crystalline nanodomains (20 nm) and then these particles are forming aggregates. The monomodal distribution of $Sb_2S_3$ particles with the average hydrodynamic parameter 210 nm was obtained. The quantification of energy dispersive X-ray spectroscopy analysis peaks give an atomic ratio of 2:3 for Sb:S. The optical band gap determined from the absorption spectrum is 4.9 eV, indicating a considerable blue shift relative to the bulk $Sb_2S_3$. Differential scanning calorimetry curves exhibit a broad exothermic peak between 200 and 300°C, suggesting recovery processes. This interpretation is supported by X-ray diffraction measurements that indicate a 23-fold increase of the crystallite size to about 827 nm as a consequence of application of high temperature process. The controlled mechanochemical synthesis of $Sb_2S_3$ nanoparticles at ambient temperature and atmospheric pressure remains a great challenge.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 4; 943-946
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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