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    Wyświetlanie 1-7 z 7
    Tytuł:
    The Magnetic Moments of Single-Domain and its Mathematics Formation
    Autorzy:
    Mezher, Sabah Jameel
    Powiązania:
    https://bibliotekanauki.pl/articles/1192618.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Magnetic Moments
    Single domain
    uniaxial particles
    rock magnetism
    palaeomagnetism
    magnetic materials
    diverse phenomena
    Opis:
    We now demonstrate that such "uniaxial" particles can allow several quantifiable stable (or metastable) orientations of the magnetic moment within the same particle. A new model is presented with quantitative predictions verified by experiments. The results have important implications for rock magnetism, palaeomagnetism, and magnetic materials research. Firstly, the new model quantitatively accounts for several previously unexplained diverse phenomena exhibited by such single-domain (SD) particles. Including the acquisition of gyroremanences, tiled-impressed anisotropy, and transverse components of reminisce in individual particles. These phenomena are theoretically impossible in idealized uniaxial single domain particles, and could now be used to quantify the deviation of real particles from ideal behavior. Secondly, deflections of the natural remanence vector and computations of the ancient field vector and paleointensity are not only controlled by the shape and distribution of the particles, but also by the possible stable orientations of the moments within single-domain particles. The model is also relevant to other single-domain particle morphologies.
    Źródło:
    World Scientific News; 2016, 60; 92-102
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the new types of composite metamaterials
    Nowy typ kompozytowych metamateriałów
    Autorzy:
    Tralle, Igor
    Zięba, Paweł
    Powiązania:
    https://bibliotekanauki.pl/articles/129556.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Rzeszowska im. Ignacego Łukasiewicza. Oficyna Wydawnicza
    Tematy:
    negative refraction index
    three-component gyromagnetic metamaterials
    single-domain ferro-magnetic nanoparticles
    superparamagnetism
    Bruggeman approximation
    ujemny współczynnik załamania
    trójskładnikowy metamateriał giromagnetyczny
    jednodomenowe ferromagnetyczne nanocząstki
    superparamagnetyzm
    przybliżenie Bruggemana
    Opis:
    This paper is the review of our study published in J Appl Phys 115, 233509 (2014) and J Mater Sci 53, 2034 (2018). In it, we examined the possibility of fabricating the metamaterial, which is both gyrotropic and of the simultaneously negative permittivity and permeability. Our idea was to use the three-component mixture of ingredients, where one of them is responsible for the negative effective permeability µeff of hypothetical metamaterial, while all three are responsible for the negative value of effective permittivity εeff. At first we considered the following composite: the first component was the “swarm” of single-domain ferromagnetic nanoparticles, immersed in a mixture of other two, silver and mercury cadmium telluride. Then, as fabrication of the Hg1-x Cdx Te is related to using mercury which is very poisoning, we tried to exclude this material substituting it by Pb1-x Snx Te. Additionally, taking into account that silver is relatively expensive material, we have also used Cu and Al particles as the cheaper substitute of it. We have shown by computer simulations that by the proper fitting of the parameters, e.g., the radius of nanoparticles, their magnetic moments, the relative concentration of ingredients, etc., it is possible to obtain the double-negative metamaterial, that is with negative refraction index in a relatively broad range of temperatures and magnetic fields. The last seems to be very promising in terms of practical applications of metamaterials.
    Praca stanowi przegląd prac autorów, opublikowanych wcześniej (J Appl Phys 115, 233509 (2014) oraz J Mater Sci 53, 2034 (2018)). W w/w pracach autorzy zbadali możliwość utworzenia metamateriału, który byłby jednocześnie giroskopowy oraz posiadał ujemne części rzeczywiste przenikalności magnetycznej i dielektrycznej. Ideą jest wykorzystanie w tym celu mieszanki trzech składników, z których pierwszy - to "rój" ferromagnetycznych nanocząstek.
    Źródło:
    Physics for Economy; 2019, 3, 1; 53-65
    2544-7742
    2544-7750
    Pojawia się w:
    Physics for Economy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Low frequency sloshing analysis of cylindrical containers with flat and conical baffles
    Autorzy:
    Gnitko, V.
    Naumemko, Y.
    Strelnikova, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/265289.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    baffles
    liquid sloshing
    free vibrations
    boundary element method
    single and multi-domain approach
    singular integral equations
    drgania swobodne
    metoda elementów brzegowych
    równania całkowe
    Opis:
    This paper presents an analysis of low-frequency liquid vibrations in rigid partially filled containers with baffles. The liquid is supposed to be an ideal and incompressible one and its flow is irrotational. A compound shell of revolution is considered as the container model. For evaluating the velocity potential the system of singular boundary integral equations has been obtained. The single-domain and multi-domain reduced boundary element methods have been used for its numerical solution. The numerical simulation is performed to validate the proposed method and to estimate the sloshing frequencies and modes of fluid-filled cylindrical shells with baffles in the forms of circular plates and truncated cones. Both axisymmetric and non-axisymmetric modes of liquid vibrations in baffled and un-baffled tanks have been considered. The proposed method makes it possible to determine a suitable place with a proper height for installing baffles in tanks by using the numerical experiment.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 867-881
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Social choice, stable outcomes and deliberative democracy
    Autorzy:
    Nurmi, Hannu
    Powiązania:
    https://bibliotekanauki.pl/articles/2183497.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Instytut Badań Systemowych PAN
    Tematy:
    choice desiderata
    domain restriction
    incompatibility result
    single-peakedness
    voting rule
    Opis:
    It has turned out that all voting rules fail on some intuitively plausible desiderata. This has led some political scientists to argue that the notion of the will of the people is profoundly ambiguous and the absence of voting equilibria a generic state of affairs. As a constructive remedy to this some authors have introduced the idea of deliberative democracy. This view of democracy has much to recommend itself, most importantly the emphasis on individuals in devising the decision alternatives. Some empirical evidence also suggests that the deliberative institutions provide an escape from some of the most notorious incompatibility results in social choice theory. We shall critically examine this suggestion. The view emerging from this examination is that social choice theory and deliberative democracy are complementary, not competing approaches to democratic decision making.
    Źródło:
    Control and Cybernetics; 2022, 51, 2; 137--149
    0324-8569
    Pojawia się w:
    Control and Cybernetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of genetic modification of the PNPLA3 gene in predicting metabolically unhealthy obesity and metabolic associated fatty liver disease in children
    Autorzy:
    Abaturov, Aleksandr
    Nikulina, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/2207159.pdf
    Data publikacji:
    2023-03-25
    Wydawca:
    Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
    Tematy:
    children
    metabolic associated fatty liver disease
    obesity
    patatin‐like phospholipase domain‐containing protein 3
    single nucleotide variants
    Opis:
    Introduction and aim. Single nucleotide variants (SNV) of the patatin‐like phospholipase domain‐containing protein 3 (PNP-LA3) gene play an important role in hepatic lipid remodeling and lipogenesis de novo, which is associated with the development of metabolically unhealthy obesity (MUO) and metabolic associated fatty liver disease (MAFLD). The aim of the study was to define the contribution of SNV PNPLA3 gene to the development of MUO, complicated by MAFLD in children. Material and methods. 200 obese children aged 6-18 years were examined. The main group (n=118) was represented by children with MUO. The control group (n=82) consolidated of children with metabolically healthy obesity (MHO). Whole genome sequencing (CeGat) was performed in 31 children of the main and 21 children of the control group. Results. Among obese children, 14 variants of SNV PNPLA3 (rs139051, rs34179073, rs2294918, rs139047, rs779127153, rs2076212, rs738409, rs738408, rs4823173, rs2072906, rs2076213, rs141106484, rs138736228) were identified, including SNV PNPLA3 g.44322818, not described in the dbSNP core database. The role of the following SNV PNPLA3 genotypes in the development of MUO complicated by MAFLD was revealed: rs738409 C/G (Relative risk (RR)=1.71); rs738408 C/T (RR=1.71); rs4823173 G/A (RR=1.57); rs2072906 A/G (RR=1.57) with Sensitivity (Se)=0.63 and Specificity (Sp)=0.72. Conclusion. The contribution to the development of MUO complicated by MAFLD in children is made by the linked association of genotypes: rs738409 C/G, rs738408 C/T, rs4823173 G/A and rs2072906 A/G out of 14 PNPLA3 SNVs diagnosed by us.
    Źródło:
    European Journal of Clinical and Experimental Medicine; 2023, 1; 5-13
    2544-2406
    2544-1361
    Pojawia się w:
    European Journal of Clinical and Experimental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Binaural speech segregation system on single board computer
    Autorzy:
    Usagawa, Tsuyoshi
    Irwansyah, Irwansyah
    Powiązania:
    https://bibliotekanauki.pl/articles/950427.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    frequency domain binaural model
    single-board computer
    hearing assistance
    open-source software
    komputer jednopłytkowy
    wsparcie słuchu
    oprogramowanie otwarte
    Opis:
    A pocket-size binaural speech segregation system has been developed and assembled with available consumer hardware. It can enhance a target speech in a certain direction while attenuating interfering sounds from other directions. This system is based on the frequency domain binaural model (FDBM) and it segregates multiple speeches based on the directivity. This real-time system is implemented on a low-cost single board computer which might be used as a hearing assistance device. Performance of the system is evaluated in a normal laboratory room as well as anechoic chamber. Even in a room with reverberation, the system works well and show the almost same performance obtained in anechoic chamber.
    Źródło:
    Vibrations in Physical Systems; 2019, 30, 1; 1-9
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rapid design exploration of low pass highly efficient single loop single bit sigma delta (ΣΔ) modulators
    Autorzy:
    Krishna, S. Vamsee
    Reddy, P. Sudhakara
    Reddy, S. Chandra Mohan
    Powiązania:
    https://bibliotekanauki.pl/articles/38699542.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    sigma delta modulator
    single loop
    time domain
    virtual instrument
    biomedical application
    modulator sigma delta
    pojedyncza pętla
    dziedzina czasu
    instrument wirtualny
    zastosowanie biomedyczne
    Opis:
    A rapid design and verification of sigma delta modulators are presented at the systemlevel with high accuracy and computational efficiency. Sigma delta analog to digital converters showcased an excellent choice for low bandwidth applications from near DC tohigh bandwidth standard 5G applications. The conceptualization of the graphical userinterface (GUI) in the efficient selection of integrator weights has been proposed, whichsolves various tradeoffs between various abstraction levels. The sigma delta modulator of the 5th order is designed and simulated using the proposed design methodology of calculating integrator weights for targeted specifications. The efficiency of design explorationand optimum selection of integrator coefficients has been investigated on single loop architectures. Power and performance of the selected modulator has been verified in the timedomain behavioral simulation. The discrete time circuit technique has been adopted fordesign of distributed feedback, feed forward architectures and comparison of performancemetrics done between selected architectures. A huge design space is computed for the bestdesign parameters that offers ultra-low power and high performance. The proposed virtual instruments supported the methodology for designing delta sigma modulators at thesystem level achieving SNDR of 122 dB over a bandwidth of 5 kHz at a clock frequencyof 1 MHz.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 27-39
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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