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Wyszukujesz frazę "Kumar, K.R." wg kryterium: Autor

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    Wyświetlanie 1-9 z 9
    Tytuł:
    Reflection and transmission at the boundary surface of modified couple stress thermoelastic media
    Autorzy:
    Kumar, R.
    Kumar, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/264443.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    termoelastyczność
    fala podłużna
    fala poprzeczna
    wskaźniki amplitudy
    modified couple stress thermoelastic solid
    longitudinal wave
    transverse wave
    reflection
    transmission
    amplitude ratios
    Opis:
    In this paper the reflection and transmission at a plane interface in modified couple stress generalized thermoelastic solid half spaces in the context of Loard-Shulman (LS) and Green-Lindsay (GL) theories in welded contact are investigated. Amplitude ratios of various reflected and transmitted waves are obtained due to incidence of a set of coupled longitudinal waves and coupled transverse waves. It is found that the amplitude ratios of various reflected and transmitted waves are functions of the angle of incidence, frequency and are affected by the couple stress properties of the media. Some special cases are deduced from the present formulation.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 61-81
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal convection in a ferromagnetic fluid layer with magnetic field dependent viscosity: a correction applied
    Autorzy:
    Prakash, J.
    Kumar, R.
    Kumari, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/178325.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    ferromagnetic convection
    magnetic field dependent viscosity
    stationary convection
    Rayleigh number
    Opis:
    The effect of magnetic field dependent (MFD) viscosity on thermal convection in a horizontal ferromagnetic fluid layer has been investigated numerically. A correction is applied to Sunil et al. [24] which is very important in order to predict the correct behavior of MFD viscosity. Linear stability analysis has been carried out for stationary convection. The MFD viscosity parameter δ as well as the measure of nonlinearity of magnetization M3, both have a stabilizing effect on the system. Numerical results are also obtained for large values of magnetic parameter M1 and predicted graphically.
    Źródło:
    Studia Geotechnica et Mechanica; 2017, 39, 3; 39-46
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Phase-lag effects in skin tissue during transient heating
    Autorzy:
    Kumar, R.
    Vashishth, A. K.
    Ghangas, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/264536.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    tkanka skórna
    transformata Laplace'a
    opóźnienie trójfazowe
    bioheat transfer
    skin tissue
    three-phase-lag
    Laplace transform
    transient heating
    Opis:
    A three-phase-lag (TPL) model is proposed to describe heat transfer in a finite domain skin tissue with temperature dependent metabolic heat generation. The Laplace transform method is applied to solve the problem. Three special types of heat flux are applied to the boundary of skin tissue for thermal therapeutic applications. The depth of tissue is influenced by the different oscillation heat flux. The comparison between the TPL and dual-phase-lag (DPL) models is analyzed and the effects of phase lag parameters […] and material constant […] on the tissue temperature distribution are presented graphically.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2019, 24, 3; 603-623
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optimization of an M/M/1/N feedback queue with retention of reneged customers
    Autorzy:
    Kumar, R.
    Jain, N. K.
    Som, B. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/969064.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    reneging
    retention of reneged customers
    revenue
    queuing system
    optimization
    dochód
    system kolejkowania
    optymalizacja
    Opis:
    Customer impatience has become a threat to the business world. Firms employ various customer retention strategies to retain their impatient (or reneged) customers. Customer retention mechanisms may help to retain some or all impatient customers. Further, due to unsatisfactory service, customers may rejoin a queue immediately after departure. Such cases are referred to as feedback customers. Kumar and Sharma take this situation into account and study an M/M/1/N feedback queuing system with retention of reneged customers. They obtain only a steady-state solution for this model. In this paper, we extend the work of Kumar and Sharma by performing an economic analysis of the model. We develop a model for the costs incurred and perform the appropriate optimization. The optimum system capacity and optimum service rate are obtained.
    Źródło:
    Operations Research and Decisions; 2014, 24, 3; 45-58
    2081-8858
    2391-6060
    Pojawia się w:
    Operations Research and Decisions
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fundamental solution in micropolar viscothermoelastic solids with void
    Autorzy:
    Kumar, R.
    Sharma, K. D.
    Garg, S. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/265845.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    micropolar thermodiffusion
    steady oscillations
    visothemoelastic
    micropolar with void
    drgania
    termosprężystość
    funkcje elementarne
    Opis:
    In the present article, we construct the fundamental solution to a system of differential equations in micropolar viscothermoelastic solids with voids in case of steady oscillations in terms of elementary functions. Some basic properties of the fundamental solution are also established.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 1; 109-125
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Soil microbial and nutrient dynamics influenced by irrigation-induced salinity and sewage sludge incorporation in sandy - loam textured soil
    Autorzy:
    Ankush
    Prakash, R.
    Kumar, R.
    Singh, V.
    Harender
    Singh, V.K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2082943.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    sewage sludge
    saline irrigation
    soil
    microbial
    biomass carbon
    enzyme activity
    Opis:
    The use of sewage sludge in agriculture is known to be environmentally friendly as it is a practical way of recycling municipal waste. A short-term experiment was carried out to study the changes in soil chemical and microbiological properties influenced through the addition of sewage sludge along with saline irrigation under a pearl millet-wheat crop rotation. There were three irrigation (canal water (0.35 dS m-1), 8 and 10 dS m-1 electrical conductivity saline water) and five fertilizer treatments (control-F1, sewage sludge (5 t ha-1)-F2, sewage sludge (5 t ha-1) +50% recommended dose of fertilizer (RDF)-F3, sewage sludge (5 t ha-1)+75% RDF-F4 and RDF-F5). The results showed that soil organic carbon, and available nitrogen, and phosphorus were reduced significantly under saline conditions but there was an increase in available potassium with the increasing salinity levels of the irrigation water. A significant reduction in soil microbial biomass carbon and enzyme activities was caused by 8 and 10 dS m-1 as compared to 0.35 dS m-1 at different growth stages of crops. Treatment F4 attained the highest soil microbial activity at each crop growth stage by a significant margin among all of the fertilizer treatments, which is associated with a substantial build-up of organic carbon and available NPK in the soil. Soil microbial activities followed a particular trend: at 35 and 75 days after sowing>harvest>sowing in pearl millet and wheat, respectively. Sewage sludge dumping is a major problem in India, and the present study suggests that by applying sewage sludge, soil biological health is improved; therefore its use in agriculture is recommended to farmers.
    Źródło:
    International Agrophysics; 2020, 34, 4; 451-462
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The onset of convection in a rotating multicomponent fluid layer
    Autorzy:
    Prakash, J.
    Singh, V.
    Kumar, R.
    Kumari, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/281283.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    multicomponent convection
    principle of exchange of stabilities
    oscillatory motions
    complex growth rate
    concentration Rayleigh number
    Lewis number
    Opis:
    The onset of convective instability is analysed in a rotating multicomponent fluid layer in which density depends on n stratifying agents (one of them is heat) having different diffusivities. Two problems have been analysed mathematically. In the first problem, a sufficient condition is derived for the validity of the principle of the exchange of stabilities. Further, when the complement of this condition holds good, oscillatory motions of neutral or growing amplitude can exist, and thus it is important to derive upper bounds for the complex growth rate of such motions when at least one of the bounding surfaces is rigid so that exact solutions of the problem in closed form are not obtainable. Thus, as the second problem, bounds for the complex growth rates are also obtained. Above results are uniformly valid for quite general nature of the bounding surfaces.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 2; 477-488
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Salinity stress effects on the growth, morphological, physiological, and biochemical properties of Melia (Melia dubia Cav.) plant
    Autorzy:
    Kumar, R.
    Banyal, R.
    Singh, A.
    Yadav, R.K.
    Sharma, P.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078273.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Dendrologii PAN
    Tematy:
    Melia
    salt stress
    growth
    physiology
    phenology
    biochemical
    Opis:
    Salinity stress severely affects the growth, physiological and developmental processes in plant species. Melia dubia is an ecologically and economically important tree species of the Indian subcontinent. However, systematic information with respect to the species salt tolerance potential is completely lacking. Under salt stress conditions, determining suitable soil EC range is required for the better survival, growth and productivity of the tree species. In present study, we investigated the effects of different soil salinity (EC 4, 8, and 12) levels on the ion homeostasis, physio-biochemistry, morphology, and growth of M. dubia plant. Results revealed that increase in soil salinity causes higher Na+ content and Na+/K+ ratio, while lower K+ content, in the leaf tissues of M. dubia. The physiological processes such as the photosynthetic rate, stomatal conductance, internal CO2 concentration, and transpiration rate were adversely affected with the increased salt stress levels. Morphological parameters, such as internodal length, petiole length, leaf length, and leaf width also decreased (P<0.05) under saline stress conditions. Results further indicat- ed that salinity levels significantly (P<0.05) affected the M. dubia growth, and the growth rate was found optimum upto 8 EC, thereafter it slightly decreased with the increased salt stress to 12 EC. Our findings showed that increased salinity stress causes significant changes in the physiological, morphological, and growth pattern of M. dubia. Therefore, based on present experiment, we found M. dubia suitable for the salt affected soils of EC 8 with optimum growth rate and at EC 12 with the moderate (20–25%) growth reduction.
    Źródło:
    Dendrobiology; 2021, 86; 56-68
    1641-1307
    Pojawia się w:
    Dendrobiology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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