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    Wyświetlanie 1-8 z 8
    Tytuł:
    Comparative Modelling Studies of 400 MHz ST-X Quartz SAW Delay Lines for Potential Gas Sensing Applications
    Autorzy:
    Thirumal, V.
    Raju, B.
    Gandhi, P.
    Pandya, H. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/177740.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface acoustic wave
    SAW delay line
    impulse response model
    equivalent circuit model
    coupling-of-modes
    COM model
    SAW sensors
    Opis:
    Surface Acoustic Wave (SAW) devices like delay lines, filters, resonators etc., are nowadays extensively used as principal solid state components in many electronic applications and chemical vapour sensors. To bring out the best from these SAW devices, computational design and modelling are resorted too. The present paper proposes the modelling of 400 MHz ST-X Quartz based SAW delay line, by three models namely, Impulse Response Model (IRM), Crossed-field Equivalent Circuit Model (ECM) and Coupling-of-Modes (COM) model. MATLAB® is employed as a computational tool to model the experimental output of the SAW device. A comparative discussion of the modelled device results is also provided.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 153-161
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Nyctanthes arbor tristis leaf extract against scopolamine-induced cognitive impairment in rats
    Wpływ wyciągu z liści Nyctanthes arbor tristis na zaburzenia poznawcze indukowane skopolaminą u szczurów
    Autorzy:
    Phanindhra, B.
    Raju, A.B.
    Vikas, G.
    Anusha, R.
    Deepika, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/71203.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Włókien Naturalnych i Roślin Zielarskich
    Opis:
    Nyctanthes arbor tristis (NATE) ethanol extract (150 mg/kg, orally) was evaluated for its protective effect against scopolamine-induced (1 mg/kg i.p.) cognitive impairments in rats using behavioral models like radial arm maze test, Morris water maze test and active avoidance test. NATE effect was evaluated and compared with the standard piracetam (200mg/kg i.p.). NATE (p<0.005) significantly reversed the impairment produced by the scopolamine in radial arm maze test. In addition, NATE also decreased the time period taken to find the hidden platform in Morris water maze test and increased number of avoidances in active avoidance paradigm. Acetylcholinesterase activity and thiobarbituric acid levels were significantly (p<0.005) decreased along with the rise in activities of superoxide dismutase and catalase. This might suggest that the NATE has protective effect against scopolamine-induced cognitive impairment in rats through acetylcholine muscarinic receptor pathway and also antioxidant activity. No significant changes were found in histopathological studies of brain.
    Badano działanie protekcyjne wyciągu etanolowego z Nyctanthes arbor tristis (NATE) (150 mg/kg, podawany dożołądkowo) skierowane przeciwko zaburzeniom poznawczym wywołanym stosowaniem skopolaminy (1 mg/kg i.p.) u szczurów, stosując odpowiednie modele behawioralne takie jak: test labiryntu ramion promienistych (radial arm maze test), test labiryntu wodnego Morrisa i test aktywnego unikania. Wynik NATE został porównany z działaniem piracetamu (200 mg/kg i.p.). W teście labiryntu ramion promienistych NATE (p<0.005) istotnie hamował zaburzenia wywołane podaniem skopolaminy. Dodatkowo NATE także skrócił czas potrzebny do wykonania zadań w teście Morrisa i zwiększył sprawność wykonywania zadań w teście aktywnego unikania. Aktywność acetylcholinesterazy i stężenia kwasu tiobarbiturowego zmniejszyły się istotnie (p<0.005) równolegle ze zwiększeniem działania dysmutazy ponadtlenkowej i katalazy. To może sugerować, że NATE ma wykazywać efekt ochronny przeciwko zaburzeniom procesów poznawczych u szczurów wywołanym przez skopolaminę zarówno poprzez receptory muskarynowe, jak i poprzez działanie antyoksydacyjne. Badanie histopatologiczne mózgowia zwierząt nie wykazało istotnych zmian.
    Źródło:
    Herba Polonica; 2014, 60, 4
    0018-0599
    Pojawia się w:
    Herba Polonica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady two-layered fluid flow of conducting fluids in a channel between parallel porous plates under transverse magnetic field in a rotating system
    Autorzy:
    Linga Raju, T.
    Neela Rao, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/264889.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    magnetohydrodynamika
    przepływ oscylacyjny
    porowatość
    magnetohydrodynamics
    two-layered fluids/immiscible fluids
    rotating fluids
    oscillating flow
    unsteady flow
    porous plates
    Opis:
    An unsteady MHD two-layered fluid flow of electrically conducting fluids in a horizontal channel bounded by two parallel porous plates under the influence of a transversely applied uniform strong magnetic field in a rotating system is analyzed. The flow is driven by a common constant pressure gradient in a channel bounded by two parallel porous plates, one being stationary and the other oscillatory. The two fluids are assumed to be incompressible, electrically conducting with different viscosities and electrical conductivities. The governing partial differential equations are reduced to the linear ordinary differential equations using two-term series. The resulting equations are solved analytically to obtain exact solutions for the velocity distributions (primary and secondary) in the two regions respectively, by assuming their solutions as a combination of both the steady state and time dependent components of the solutions. Numerical values of the velocity distributions are computed for different sets of values of the governing parameters involved in the study and their corresponding profiles are also plotted. The details of the flow characteristics and their dependence on the governing parameters involved, such as the Hartmann number, Taylor number, porous parameter, ratio of the viscosities, electrical conductivities and heights are discussed. Also an observation is made how the velocity distributions vary with the rotating hydromagnetic interaction in the case of steady and unsteady flow motions. The primary velocity distributions in the two regions are seen to decrease with an increase in the Taylor number, but an increase in the Taylor number causes a rise in secondary velocity distributions. It is found that an increase in the porous parameter decreases both the primary and secondary velocity distributions in the two regions.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 423-446
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    MHD heat transfer in two-layered flow of conducting fluids through a channel bounded by two parallel porous plates in a rotating system
    Autorzy:
    Linga Raju, T.
    Neela Rao, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/264768.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    magnetohydrodynamika
    przenikanie ciepła
    porowatość
    MHD
    two-layered fluids/immiscible fluids
    unsteady flow
    heat transfer
    rigid rotation
    porous boundaries
    Opis:
    The paper aims to analyze the heat transfer aspects of a two-layered fluid flow in a horizontal channel under the action of an applied magnetic and electric fields, when the whole system is rotated about an axis perpendicular to the flow. The flow is driven by a common constant pressure gradient in the channel bounded by two parallel porous insulating plates, one being stationary and the other one oscillatory. The fluids in the two regions are considered electrically conducting, and are assumed to be incompressible with variable properties, namely, different densities, viscosities, thermal and electrical conductivities. The transport properties of the two fluids are taken to be constant and the bounding plates are maintained at constant and equal temperature. The governing partial differential equations are then reduced to the ordinary linear differential equations by using a two-term series. The temperature distributions in both fluid regions of the channel are derived analytically. The results are presented graphically to discuss the effect on the heat transfer characteristics and their dependence on the governing parameters, i.e., the Hartmann number, Taylor number, porous parameter, and ratios of the viscosities, heights, electrical and thermal conductivities. It is observed that, as the Coriolis forces become stronger, i.e., as the Taylor number increases, the temperature decreases in the two fluid regions. It is also seen that an increase in porous parameter diminishes the temperature distribution in both the regions.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 623-648
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Unsteady electro-magneto hydrodynamic flow and heat transfer of two ionized fluids in a rotating system with Hall currents
    Autorzy:
    Raju, T. Linga
    Rao, B. Venkat
    Powiązania:
    https://bibliotekanauki.pl/articles/2174167.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    transfer ciepła
    przepływ nieustalony
    plazma
    pole magnetyczne
    pole elektryczne
    unsteady flow
    magnetic field
    electric field
    immiscible flow
    plasma
    Hall effect
    rotating frame
    heat transfer
    insulating plate
    Opis:
    An unsteady flow and heat transmission of ionized gases via a horizontal channel enclosed by non-conducting plates in a rotating framework with Hall currents is examined using electro-magnetohydrodynamic (EMHD) two-fluid heat flow. The Hall current impact is taken into account by assuming that the gases are totally ionized, the applied transverse magnetic field is very strong. For temperature and velocity distributions in two-fluid flow regions, the governing equations are solved analytically. For numerous physical parameters such as the Hartmann number, Hall parameter, rotation parameter, viscosity ratio, and so on, numerical solutions are visually displayed. It was discovered that an increase in temperature in the two regions is caused by the thermal conductivity ratio. It was also realized that an increase in rate of heat transfer coefficient at the plates is caused by either the Hartman number or the Hall parameter.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 1; 125--145
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Hall effect on MHD 2-fluid unsteady heat transfer flow of plasma in a rotating system via a straight channel between conducting plates
    Autorzy:
    Raju, T. Linga
    Rao, B. Venkata
    Powiązania:
    https://bibliotekanauki.pl/articles/2174207.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    wymiana ciepła
    efekt Halla
    plazma
    unsteady flow
    MHD
    immiscible flow
    heat transfer
    Hall effect
    plasma
    rotating frame
    conducting plate
    Opis:
    Hall currents are used to investigate MHD unsteady two fluid flows and heat transport of plasma along a straight channel of conducting plates. In the two liquid zones, the velocity and temperature fields for the case of conducting side plates are obtained by solving the governing equations using a two-term series under the specified conditions. The distribution profiles are graphically resolved and examined. The distributions are thought to be dependent on the electron-to-total pressure ratio. The flow and heat transfer factors are also influenced by other parameters such as the Hartmann number, Hall parameter, rotation parameter, thermal conductivity and viscosity ratio.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 137--162
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimizing cutting parameters in hard turning of AISI 52100 steel using TOPSIS approach
    Autorzy:
    Umamaheswarrao, Ponugoti
    Ranga Raju, D.
    Suman, Koka Naga Sai
    Ravi Sankar, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/95287.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    machining force
    surface roughness
    TOPSIS
    optimization
    siła skrawania
    chropowatość powierzchni
    optymalizacja
    Opis:
    In the present work optimization of cutting parameters is performed while hard turning of AISI 52100 steel with polycrystalline cubic boron nitride (PCBN) tools using Technique for Order Preference by Similarity to Ideal Solution (TOPSIS). Experiments are planned and conducted based on Center Composite Rotatable Design (CCD) of the Response Surface Method (RSM). Cutting speed, feed, depth of cut, nose radius and negative rake angle are considered as input parameters. In this study machining force (F) and surface roughness (Ra) are measured during the experiment. Analysis of variance (ANOVA) is deployed to determine the influence of process parameters. Obtained optimal parameters are speed 200 rpm, feed 0.1 mm/rev, depth of cut 0.8 mm, nose radius 1.2 mm and negative rake angle 45º.
    Źródło:
    Journal of Mechanical and Energy Engineering; 2019, 3, 3; 227-232
    2544-0780
    2544-1671
    Pojawia się w:
    Journal of Mechanical and Energy Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical solutions by EFGM of MHD convective fluid flow past a vertical plate immersed in a porous medium in the presence of cross diffusion effects via biot number and convective boundary condition
    Autorzy:
    Raju, R. S.
    Reddy, B. M.
    Rashidi, M. M.
    Gorla, R. S. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/265443.pdf
    Data publikacji:
    2017
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    thermal diffusion
    diffusion thermo
    MHD
    porous medium
    EFGM
    dyfuzja termiczna
    magnetohydrodynamika
    porowatość
    Opis:
    In this investigation, the numerical results of a mixed convective MHD chemically reacting flow past a vertical plate embedded in a porous medium are presented in the presence of cross diffusion effects and convective boundary condition. Instead of the commonly used conditions of constant surface temperature or constant heat flux, a convective boundary condition is employed which makes this study unique and the results more realistic and practically useful. The momentum, energy, and concentration equations derived as coupled second-order, ordinary differential equations are solved numerically using a highly accurate and thoroughly tested element free Galerkin method (EFGM). The effects of the Soret number, Dufour number, Grashof number for heat and mass transfer, the viscous dissipation parameter, Schmidt number, chemical reaction parameter, permeability parameter and Biot number on the dimensionless velocity, temperature and concentration profiles are presented graphically. In addition, numerical results for the local skin-friction coefficient, the local Nusselt number, and the local Sherwood number are discussed through tabular forms. The discussion focuses on the physical interpretation of the results as well as their comparison with the results of previous studies.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 613-636
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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