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    Wyświetlanie 1-7 z 7
    Tytuł:
    Linear stability effect of densely distributed porous medium and Coriolis force on Soret driven ferrothermohaline convection
    Autorzy:
    Sekar, R.
    Murugan, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/264456.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    siła Coriolisa
    model Darcy'ego
    efekt Soreta
    ferrofluid
    Coriolis force
    Darcy model
    Soret effect
    thermohaline convection
    Opis:
    The effect of Coriolis force on the Soret driven ferrothermohaline convection in a densely packed porous medium has been studied. A linear stability analysis is carried out using normal mode technique. It is found that stationary convection is favorable for the Darcy model, therefore oscillatory instability is studied. A small thermal perturbation is applied to the basic state and linear stability analysis is used for which the normal mode technique is applied. It is found that the presence of a porous medium favours the onset of convection. The porous medium is assumed to be variable and the effect of the permeable parameter is to destabilize the system. The present work has been carried out both for oscillatory as well as stationary instabilities. The results are depicted graphically.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 911-928
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The onset of Soret driven ferrothermoconvective instability in the presence of darcy porous medium with anisotropy effect and MFD viscosity
    Autorzy:
    Murugan, D.
    Sekar, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839900.pdf
    Data publikacji:
    2021
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    anizotropia
    lepkość
    porowatość
    model Darcy'ego
    anisotropy effect
    Darcy model
    MFD viscosity
    porous medium
    Soret coefficient
    Opis:
    The effect of magnetic dependent (MFD) viscosity on Soret driven ferrothermohaline convection in a densely packed anisotropic porous medium has been studied. The Soret effect is focused on the system. A linear stability analysis is carried out using a normal mode technique and a perturbation method is applied. It is found that a stationary mode is favorable for the Darcy model. Vertical anisotropy tends to destabilize the system and the magnetization effect is found to stabilize the system. It is also found that the MFD viscosity delays the onset of convection. Numerical computations are made and illustrated graphically.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2021, 26, 1; 156-177
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of soret and temperature dependent viscosity on thermohaline convection in a ferrofluid saturating a porous medium
    Autorzy:
    Sekar, R.
    Raju, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/955159.pdf
    Data publikacji:
    2014
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    porowatość
    ciecz wieloskładnikowa
    wymiana ciepła i masy
    ferroconvection
    porous medium
    Soret effect
    multi-component system
    Brinkman model
    temperature dependent viscosity
    Galerkin technique
    Opis:
    Soret driven ferrothermoconvective instability in multi-component fluids has a wide range of applications in heat and mass transfer. This paper deals with the theoretical investigation of the effect of temperature dependent viscosity on a Soret driven ferrothermohaline convection heated from below and salted from above subjected to a transverse uniform magnetic field in the presence of a porous medium. The Brinkman model is used in the study. It is found that the stationary mode of instability is preferred. For a horizontal fluid layer contained between two free boundaries an exact solution is examined using the normal mode technique for a linear stability analysis. The effect of salinity has been included in magnetization and density of the fluid. The critical thermal magnetic Rayleigh number for the onset of instability is obtained numerically for sufficiently large values of the buoyancy magnetization parameter M1 using the method of numerical Galerkin technique. It is found that magnetization and permeability of the porous medium destabilize the system. The effect of temperature dependent viscosity stabilizes the system on the onset of convection.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 321-336
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Infrared and ¹³C NMR spectral studies of some aryl hydrazides: Assessment of substituent effects
    Autorzy:
    Thirunarayanan, G.
    Sekar, G. K.
    Lakshmi Narayanan, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/412577.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    substituted aryl benzohydrazide
    IR spectra
    NMR spectra
    hammett equation
    substituent constants
    correlation analysis
    Opis:
    A series of some aryl hydrazides have been synthesized. These hydrazides purities were analyzed by physical constants and spectral data. The assigned spectral group frequencies were correlated with Hammett substituent constants and Swain-Lupton parameters using single and multi-linear regression analysis. From the results of statistical analysis, the effect of substituents on the spectral group frequencies has been discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 13, 1; 88-94
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    (E)-N-substitutedbenzylidene-4-methoxyanilines as Insect Antifeedants
    Autorzy:
    Lakshmanan, K.
    Sekar, K. G.
    Sathiyendiran, V.
    Suresh, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/411920.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Substituted Schiff’s bases
    leaf-discs bio assay
    Insect antifeedant activity
    Opis:
    Some substituted aryl Schiff’s bases[(E)-N-substitutedbenzylidene-4-methoxyanilines] have been prepared and their purities were checked by their physical constants and spectroscopic data reported earlier. The insect antifeedant activities of these Schiff’s bases have been studied by leafdiscs bio assay method using 4th instar larvae Achoea Janata L.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2015, 41; 118-123
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Urban freight distribution: council warehouses & freight by rail
    Logística urbana: transporte ferroviário urbano de mercadorias
    Autorzy:
    Sładkowski, A.
    Dantas, R.
    Micu, C.
    Sekar, G.
    Arena, A.
    Singhania, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/375272.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
    Tematy:
    urban
    freight
    city logistics
    metro
    council warehouse
    bento box
    miasto
    logistyka miasta
    Opis:
    Rail is the one of the highly underused form of freight transportation in the European Union. Majority of the freightage are distributed by trucks and HGVs. With new regulations and socio-environmental concerns urban logistics is facing a new challenge which can be tackled using innovative transport mechanisms and streamline operations. This article sheds light on a system which integrates freight distribution via metro lines in the closest vicinity of the customer, use of council warehouses and further innovative transport mechanisms for final delivery. This system uses existing infrastructure effectively without impacting its surroundings and triggers the reduction of polluting carriers. This system offers the option of immediate implementation which will enable EU to compete with a global freight distribution market.
    O caminho-de-ferro e um dos meios de transporte de mercadorias mais subaproveitado na União Europeia. A maioria da carga transportada é distribuída recorrendo ao transporte rodoviário. A entrada em vigor de novos regulamentos em conjunto com o aumento das preocupações sociais e ambientais, levam a que logística urbana enfrente novos desafios. Desafios estes que podem ser superados através de mecanismos inovadores e ou pela otimização de processos. Este artigo propõe uma nova abordagem através de um sistema que integra o transporte urbano de mercadorias sobre a rede de metropolitano chegando assim mais perto do destino final da carga, propõe ainda a instalação de pequenos centros de distribuição local e formas inovadoras de transporte até ao destino final da mercadoria. Este sistema utiliza a infraestrutura já existente de forma eficiente e sem impactos para a sua vizinhança, contribuindo assim para a redução da poluição causada pelo transporte rodoviário. Este sistema oferece a possibilidade de implementação imediata o que contribuirá para que a União Europeia possa competir num mercado de transporte de mercadorias global.
    Źródło:
    Transport Problems; 2014, T. 9, z. spec.; 29-43
    1896-0596
    2300-861X
    Pojawia się w:
    Transport Problems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spectral correlations in some substituted styryl (E)-4-((2-oxopropyl) diazenyl) benzoic acids
    Autorzy:
    Sathiyendiran, V.
    Sekar, K. G.
    Thirunarayanan, G.
    Arulkumaran, R.
    Sundararajan, R.
    Kamalakkannan, D.
    Suresh, R.
    Manikanadan, V.
    Vijayakumar, R.
    Vanangamudi, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/412199.pdf
    Data publikacji:
    2014
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Oxo-propyl diazenyl benzoic acid chalcones
    IR spectra
    NMR spectra
    Hammett equation
    Regression analysis
    Opis:
    A series of titled compounds were prepared and analyzed their purities by literature method. The infrared and NMR spectral group frequencies of the compounds were assigned and correlated with Hammett substituent constants, F and R constants using single and multi linear regression analysis. From the results of statistical analysis, the effect of substituents on the above spectral frequencies was discussed.
    Źródło:
    International Letters of Chemistry, Physics and Astronomy; 2014, 11, 1; 33-43
    2299-3843
    Pojawia się w:
    International Letters of Chemistry, Physics and Astronomy
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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