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    Wyświetlanie 1-8 z 8
    Tytuł:
    Positron study of the structure of nonadecane-tricosane mixed solid
    Autorzy:
    Zgardzińska, B.
    Goworek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/146297.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    positron annihilation
    n-alkanes
    binary mixture
    Opis:
    Positron annihilation lifetime and intensity were measured as a function of temperature for a binary mixture of two normal alkanes. The rotator phase is preceded by the range of about 7 K, in which one observes instability of spectrum parameters. In that range the mixed solid, being initially introduced into rotator phase, transforms to a rigid one in the time scale of several hours.
    Źródło:
    Nukleonika; 2010, 55, 1; 47-49
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Twist Grain Boundary phases in binary mixture of Liquid Crystals
    Autorzy:
    Chaudhry, Manisha
    Powiązania:
    https://bibliotekanauki.pl/articles/1159586.pdf
    Data publikacji:
    2018
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Binary mixture
    Liquid crystals
    TGB
    TGBA*
    Opis:
    The Investigations of Twist Grain Boundary (TGB) phases in liquid crystals exhibits in different types of structural groups. In this study, these new findings present in the binary mixture of highly chiral liquid crystal, Cholesteric Nonanoate (CN) and nematic liquid crystal, N-(4-Ethoxy benzylidine)-4-butyle aniline (EBBA). The Differential Scanning Calorimeter (DSC) has shown the thermodynamic phase transition of binary mixture at different scanning rate. At the other hand Optical studies of Twist grain boundary phases has also shown different type of textures. The domain of existence of TGB has exhibited with the weight percentage of EBBA is increased in highly chiral liquid crystals. This is very excited fact that the temperature range of type of TGB (TGBA*) phase is different at the different scanning rate. In the optical investigation we found new phases in cooling cycle as compare to the heating cycle.
    Źródło:
    World Scientific News; 2018, 113; 148-156
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time requirements in closed and open batch distillation arrangements for separation of a binary mixture
    Autorzy:
    Zhao, Shuo
    Bai, Peng
    Guo, Xianghai
    Tang, Ke
    Li, Guangzhong
    Powiązania:
    https://bibliotekanauki.pl/articles/778400.pdf
    Data publikacji:
    2014
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    time requirements
    closed operation
    multivessel column
    binary mixture
    Opis:
    Batch time requirements are provided for the separation of binary zeotropic mixtures in two different multivessel columns (with and without vapor bypass), a non-cyclic two-vessel column and a regular batch column based on dynamic simulations. The first three columns are operated as closed (total reflux) systems and the regular batch column is operated as an open (partial reflux) system. We analyze the effects of feed composition, relative volatility and product specification on the time requirements. The multivessel arrangements perform better than the regular batch column, which requires from 4.00 to 34.67% more time to complete a given separation. The elimination of the vapor bypass in the multivessel column is impractical though it has a positive effect on the batch time requirements. Thus, the multivessel column, with the vapor stream bypassing the intermediate vessel, is proposed as the best candidate for a binary zeotropic mixture with low concentration of light component, low relative volatility and high product purity demand. Furthermore, an experimental multivessel column with vapor bypass is built and the corresponding experiments verify the simulations.
    Źródło:
    Polish Journal of Chemical Technology; 2014, 16, 4; 66-74
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical studies on molecular interaction of 1,3,4-pyrazoline derivatives using ultrasonic technique at 303.15 K
    Autorzy:
    Santhi, A. R. N.
    Powiązania:
    https://bibliotekanauki.pl/articles/412461.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Binary mixture
    molecular interaction
    ultrasonic velocity
    density
    viscosity
    free length
    Opis:
    The acoustical parameters for the binary liquid mixtures containing Pyrazoline derivatives in DMF have been estimated at 303.15 K, from the measured values of ultrasonic velocity (U), density (ρ) and viscosity (η). From these data some of acoustical parameters such as adiabatic compressibility (β), free length (Lf), acoustic impedance (Z), Rao’s constant (R), molar compressibility (W), relaxation time (τ), free volume (Vf) and internal pressure (πi), etc., have been computed using the standard relations. The results have been discussed in terms of molecular interactions.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 100-115
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined effects of helical force and rotation on stationary convection of a binary ferrofluid in a porous medium
    Autorzy:
    Kpossa, M.
    Monwanou, A. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/2174187.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    konwekcja
    ferrofluid
    ośrodek porowaty
    helical force
    stationary convection
    binary mixture of ferrofluid
    porous medium
    rotation
    Opis:
    This work studies the simultaneous effects of helical force, rotation and porosity on the appearance of stationary convection in a binary mixture of a ferrofluid and on the size of convection cells. We have determined the analytical expression of the Rayleigh number of the system as a function of the dimensionless parameters. The effect of each parameter on the system is studied. The consideration of the simultaneous effect of the basic characteristics made it possible to determine the evolution of the convection threshold in the ferrofluid and then the size of convection cells. The analyzes of the various results obtained allowed us to deduce whether the convection sets in quickly or with a delay when the various effects taken into account in the study are considered simultaneously.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 158--176
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Critical fluctuations of a confined binary mixture
    Autorzy:
    Zubaszewska, M.
    Gendiar, A.
    Masłowski, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/122320.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    computational statistical mechanics
    binary liquid mixture
    critical phenomena
    ciekła mieszanina dwuskładnikowa
    zjawiska krytyczne
    Opis:
    Exploiting the mapping between a binary mixture and the Ising model we have analyzed the critical fluctuations by means of the density-matrix renormalization group technique. The calculations have been carried out for a two-dimensional Ising strip subject to equally strong surface fields. It was found that the critical Casimir force has significantly different behavior on opposite sides of the capillary condensation line, especially below the critical temperature. It can be concluded that in real binary mixtures the most attractive force appears at temperatures near Tc and at reservoir compositions slightly away from the critical composition.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2014, 13, 4; 177-182
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Presenting a technique for registering images and range data using a topological representation of a path within an environment
    Autorzy:
    Ferreira, F.
    Davim, L.
    Rocha, R.
    Dias, J.
    Santos, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/385035.pdf
    Data publikacji:
    2007
    Wydawca:
    Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
    Tematy:
    sensor feature integration
    binary data
    Bernoulli mixture model
    dimensionality reduction
    robot localisation
    change detection
    Opis:
    This article presents a novel method to the utilize topological representation of a path, thatpath that is created from sequences of images from digital cameras and sensor data from range sensors. A topological representation of the environment is created by leading the robot around the environment during a familiarisation phaseLeading the robot around the environment during a familiarisation phase creates a topological representation of the environment. While moving down the same path, the robot is able to localise itself within the topological representation that is has been previously created. The principal contribution to the state of the art is that, by using a topological representation of the environment, individual 3D data sets acquired from a set of range sensors need not be registered in a single, [Global] Coordinate Reference System. Instead, 3D point clouds for small sections of the environment are indexed to a sequence of multi-sensor views, of images and range data. Such a registration procedure can be useful in the construction of 3D representations of large environments and in the detection of changes that might occur within these environments.
    Źródło:
    Journal of Automation Mobile Robotics and Intelligent Systems; 2007, 1, 3; 47-56
    1897-8649
    2080-2145
    Pojawia się w:
    Journal of Automation Mobile Robotics and Intelligent Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Hybrid texture and gradient modeling for dynamic background subtraction identification systemin tobacco plant using 5G data service
    Autorzy:
    Gowda Thirthe, M.T.
    Chandrika, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/38699145.pdf
    Data publikacji:
    2023
    Wydawca:
    Instytut Podstawowych Problemów Techniki PAN
    Tematy:
    background subtraction
    local binary pattern
    tobacco plant
    texture
    Gaussian mixture model
    illumination change
    plant disease identification system
    usuwanie tła
    lokalny wzorzec binarny
    tytoń
    tekstura
    model mieszaniny Gaussa
    zmiana oświetlenia
    system identyfikacji chorób roślin
    Opis:
    Background: Detecting the plants as objects of interest in any vision-based input sequence is highly complex due to nonlinear background objects such as rocks, shadows,etc. Therefore, it is a difficult task and an emerging one with the development of precision agriculture systems. The nonlinear variations of pixel intensity with illuminationand other causes such as blurs and poor video quality also make the object detection taskchallenging. To detect the object of interest, background subtraction (BS) is widely usedin many plant disease identification systems, and its detection rate largely depends on thenumber of features used to suppress and isolate the foreground region and its sensitivitytoward image nonlinearity. Methodology: A hybrid invariant texture and color gradient-based approach is proposed to model the background for dynamic BS, and its performance is validated byvarious real-time video captures covering different kinds of complex backgrounds and various illumination changes. Based on the experimental results, a simple multimodal featureattribute, which includes several invariant texture measures and color attributes, yieldsfinite precision accuracy compared with other state-of-art detection methods. Experimental evaluation of two datasets shows that the new model achieves superior performanceover existing results in spectral-domain disease identification model. 5G assistance: After successful identification of tobacco plant and its analysis, the finalresults are stored in a cloud-assisted server as a database that allows all kinds of 5G servicessuch as IoT and edge computing terminals for data access with valid authentication fordetailed analysis and references.
    Źródło:
    Computer Assisted Methods in Engineering and Science; 2023, 30, 1; 41-54
    2299-3649
    Pojawia się w:
    Computer Assisted Methods in Engineering and Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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