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    Wyświetlanie 1-11 z 11
    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:
    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:
    The effect of magnetic field dependent viscosity on ferromagnetic convection in a rotating sparsely distributed porous medium - revisited
    Autorzy:
    Prakash, J.
    Kumar, P.
    Manan, S.
    Sharma, K. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/265547.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    ferrofluid
    konwekcja
    pole magnetyczne
    materiał porowaty
    convection
    rotation
    magnetic field dependent viscosity
    porous medium
    Opis:
    The effect of magnetic field dependent (MFD) viscosity on the thermal convection in a ferrofluid layer saturating a sparsely distributed porous medium has been investigated by using the Darcy-Brinkman model in the simultaneous presence of a uniform vertical magnetic field and a uniform vertical rotation. A correction is applied to the study of Vaidyanathan et al. [11] which is very important in order to predict the correct behavior of MFD viscosity. A linear stability analysis has been carried out for stationary modes and oscillatory modes separately. The critical wave number and critical Rayleigh number for the onset of instability, for the case of free boundaries, are determined numerically for sufficiently large values of the magnetic parameterM1 . Numerical results are obtained and are illustrated graphically. It is shown that magnetic field dependent viscosity has a destabilizing effect on the system for the case of stationary mode and a stabilizing effect for the case of oscillatory mode, whereas magnetization has a destabilizing effect.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 142-158
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of the Flexural Behaviour of Warp Knitted Reinforced Ferrocement Composites
    Badanie właściwości zginania siatkobetonu wzmocnionego zbrojeniami dzianymi
    Autorzy:
    Paramasivam, S.
    Rameshkumar, M.
    Malathy, R.
    Prakash, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/232287.pdf
    Data publikacji:
    2019
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    ferrocement
    nylon
    chicken mesh
    laminate
    warp knit
    okucie
    siatka z drutu stalowego
    laminat
    dzianina osnowowa
    Opis:
    This paper presents the effect of warp knit textile reinforcement in ferrocement laminates. In general, steel wire mesh is used as ferrocement reinforcement, which is often known aschicken mesh. The need for the replacement of steel mesh is the problem of corrosion, which reduces the durability of ferrocement laminate. High performance synthetic fibres and fabrics are constantly used in various research works as reinforcement in concrete. In this paper, an attempt was made to incorporate three different nylon warp knit mesh structures in the place of chicken mesh. Ferrocement composites were produced with chicken mesh and nylon warp knit fabrics. The flexural properties of ferrocement laminates were analysed in terms of the first crack load, ultimate load, energy absorption capacity and ductility factor. Nylon square mesh with 3 layers in the reinforcement has a 2.5 kN first crack load and 3.36 kN ultimate load, which is higher than chicken mesh reinforcement in ferrocement laminate. The results show that there is an improvement in the flexural properties of ferrocement laminates reinforced with a nylon warp knit structure. The flexural parameters have a direct relationship with the number of layers used in the reinforcement.
    W pracy przedstawiono wpływ zbrojenia z dzianiny osnowowej na właściwości siatkobetonu. Siatka z drutu stalowego jest często stosowana jako wzmocnienie szkieletu. Z powodu korozji, która zmniejsza trwałość laminatu stalowego, istnieje potrzeba wymiany siatki stalowej na inny materiał. Wysokiej jakości włókna syntetyczne i tkaniny są stale wykorzystywane w różnych pracach badawczych jako wzmocnienie stosowane betonu. W pracy podjęto próbę włączenia trzech różnych struktur siatkowych z osnową nylonową w miejsce standardowej siatki. Kompozyty siatkobetonowe zostały wyprodukowane z siatki i dzianiny z osnową nylonową. Właściwości zginania laminatów żelaznych analizowano pod kątem obciążenia do pierwszego pęknięcia, obciążenia końcowego, zdolności pochłaniania energii i współczynnika ciągliwości. Nylonowa siatka z 3 warstwami w zbrojeniu uzyskała następujące wyniki: obciążenie do pierwszego pęknięcia – 2,5 kN i obciążenie końcowe – 3,36 kN. Wyniki pokazały, że właściwości zginania laminatów żelbetowych wzmocnionych strukturą dzianiny osnowowej nylonowej uległy polepszeniu, a parametry zginania miały bezpośredni związek z liczbą warstw stosowanych we wzmocnieniu.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2019, 4 (136); 94-101
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    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:
    Oscillation of time fractional vector diffusion-wave equation with fractional damping
    Autorzy:
    Ramesh, R.
    Harikrishnan, S.
    Nieto, J. J.
    Prakash, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/255843.pdf
    Data publikacji:
    2020
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    fractional diffusion-wave equation H-oscillation
    vector differential equation
    Opis:
    In this paper, sufficient conditions for H-oscillation of solutions of a time fractional vector diffusion-wave equation with forced and fractional damping terms subject to the Neumann boundary condition are established by employing certain fractional differential inequality, where H is a unit vector in Rn. The examples are given to illustrate the main results.
    Źródło:
    Opuscula Mathematica; 2020, 40, 2; 291-305
    1232-9274
    2300-6919
    Pojawia się w:
    Opuscula Mathematica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of the Influence of Stretch on the Air Permeability of Knitted Fabric: Effect of Loop Length
    Badanie wpływu rozciągnięcia dzianin na przepuszczalność powietrza. Wpływ długości pętli
    Autorzy:
    Kumar, V.
    Prakash, C.
    Manigandan, G.
    Sampath, V. R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1419911.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    air permeability
    comfort
    knitted fabrics
    loop length
    relaxation
    stretch
    przepuszczalność powietrza
    wygoda
    dzianiny
    długość pętli
    rozciągliwość
    Opis:
    Most of the time, a certain degree of stretch prominently and incrementally occurs in intimate wear, leisure wear, sportswear, medical textiles etc., during their action. Variations in the stretch gradient would definitely cause changes in the air permeability of knitted fabrics. The influence of variables such as loop length, the presence of an elastomeric component and fabric structure on the air permeability of cotton single jersey and pique knitted fabrics in a stretched state was critically analysed. In this work, changes in the air permeability of cotton jersey samples with and without elastomer were investigated and reported by keeping the samples in static up to an incremental stretch of 40% at a rate of 10% of the stretch gradient, in a dry relaxed state, wet relaxed state and fully relaxed state.
    W większości przypadków, podczas użytkowania odzieży rekreacyjnej, sportowej, medycznej itp. występuje pewien stopień rozciągnięcia. Wahania gradientu rozciągliwości powodują zmiany przepuszczalności powietrza dzianin. W pracy przeanalizowano wpływ zmiennych, takich jak: długość pętli, obecność składnika elastomerowego i rodzaju struktury na przepuszczalność powietrza dzianin bawełnianych typu single jersey i typu pique w stanie rozciągniętym. W pracy zbadano i odnotowano zmiany przepuszczalności powietrza w przypadku próbek dżerseju bawełnianego z elastomerem i bez elastomeru, utrzymując próbki w stanie statycznym do przyrostowego rozciągnięcia 40% z 10% gradientem rozciągania w stanie mokrym i suchym.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 1 (145); 53-56
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enhancement of the Hong-Mandel higher-order squeezing and amplitude odd-power squeezing in even coherent state by its superposition with vacuum state
    Autorzy:
    Kumar, P.
    Kumar, R.
    Prakash, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1054884.pdf
    Data publikacji:
    2017-06
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    coherent state
    non-classical features of optical field
    the Hong-Mandel higher-order squeezing
    amplitude n th-power squeezing
    phase shifting operator
    Opis:
    We study the Hong-Mandel 2n th-order squeezing of the Hermitian operator, X_θ ≡ X₁cosθ + X₂sinθ and amplitude n th-power squeezing of the Hermitian operator, Y_θ^{(n)} ≡ Y₁^{(n)}cosθ + Y₂^{(n)}sinθ in superposed state |ψ⟩ = K[|α,+⟩ + re^{iφ}|0⟩], of vacuum state and even coherent state defined by |α,+⟩ = K_+[|α⟩+|-α⟩]. Here operators X_{1,2} are defined by X₁ + iX₂ = a, operators Y_{1,2}^{(n)} are defined by Y₁^{(n)} + iY₂^{(n)} = aⁿ, a is the annihilation operator, α, θ, r and φ are arbitrary and the only restriction on these is the normalization condition of the superposed state. We show that the Hong-Mandel 2n th-order squeezing and amplitude odd-power squeezing exhibited by even coherent state enhance in its superposition with vacuum state. Variations of these higher-orders squeezing with different parameters near its maxima have also been discussed.
    Źródło:
    Acta Physica Polonica A; 2017, 131, 6; 1485-1490
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dislocation Generation and Propagation across the Seed in Seed Cast-Si Ingots
    Autorzy:
    Miyamura, Y.
    Chen, J.
    Prakash, R.
    Jiptner, K.
    Harada, H.
    Sekiguchi, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1363535.pdf
    Data publikacji:
    2014-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    88.40.jj
    81.10.Fq
    61.72.Ff
    61.72.Hh
    61.72.Lk
    Opis:
    We have studied the dislocation generation and propagation from the seed crystals during seed cast Si growth. The grown ingot was cut into a vertical wafer, followed by the dislocation imaging using X-ray topography and Secco etching. The dislocation behavior at the seed area was compared with the dislocation generation at the top surface due to the thermal stress during cooling. The dislocations at the seed/crystal interface have propagated on the {111} plane toward top. When the seed surface was not melted sufficiently, the interface defect density became high, but no clear dislocation propagation was recognized. This suggests that the thermal shock at the seed/melt interface was not high enough to propagate dislocations to the growth direction. A certain amount of dislocations has been introduced from the top into the ingot according to the thermal stress. These observations suggest that optimizing the initial growth condition is important to dislocation control.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 4; 1024-1026
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and analysis of the performance of multi-source interconnected electrical power system using resilience random variance reduction technique
    Autorzy:
    Prakash Ayyappan, B.
    Kanimozhi, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2086869.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    multi-source power system
    single area power system
    LFC
    resilience random variance reduction technique
    wieloźródłowy system elektroenergetyczny
    jednoobszarowy system elektroenergetyczny
    technika redukcji wariancji odporności losowej
    Opis:
    The increasing demand for electricity and global attention to the environment has led energy planners and developers to explore developing control techniques for energy stability. The primary objective function of this research in an interconnected electrical power system to increase the stability of the system with the proposed RRVR technique is evaluated in terms of the different constraints like THD (%), steady-state error (%), settling time (s), overshoot (%), efficiency (%) and to maintain the frequency at a predetermined value, and controlling the change of the power flow of control between the areas renewable energy generation (solar, wind, and fuel cell with battery management system) based intelligent grid system. To provide high-quality, reliable and stable electrical power, the designed controller should perform satisfactorily, that is, suppress the deviation of the load frequency. The performance of linear controllers on non-linear power systems has not yet been found to be effective in overcoming this problem. In this work, a fractional high-order differential feedback controller (FHODFC) is proposed for the LFC problems in a multi-area power system. The gains of FHODFC are best adjusted by resilience random variance reduction technique (RRVR) designed to minimize the overall weighted absolute error performance exponential time. Therefore, the controller circuit automatically adjusts the duty cycle value to obtain a desired constant output voltage value, despite all the grid system’s source voltage and load output changes. The proposed interconnected multi-generation energy generation topology is established in MATLAB 2017b software.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 5; e137941, 1--14
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Antimicrobial activity of methanolic root extract of Decalepis hamiltonii Wight and Arn
    Autorzy:
    Prakash, P.
    Manivasagaperumal, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/11198.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Opis:
    The present study was quantitative analysis and antimicrobial activity of petroleum ether, chloroform, ethyl acetate, methanol root extracts. The gram positive and gram negative bacterial and fungal species by the disc diffusion method at various concentration (250μl-1000μl). The results was present in the phenolic and flavonoid content compared to extracts. All the root extract against to Bacillus subtilis and Streptococcus pyogenes and fungal species Candida albicans at highest inhibition at concentration of methanolic root extract of zone formation. The preliminary studies on Decalepis hamiltonii root extract exhibited their antimicrobial potential which could be exploited further and future pharmaceutical, therapeutic efficiency and food preservation and applications.
    Źródło:
    International Letters of Natural Sciences; 2016, 56
    2300-9675
    Pojawia się w:
    International Letters of Natural Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-11 z 11

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