Autor: Singh, A. S. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Change in entropy of the spinning black holes
Autorzy:: Mahto, D.
Singh, A. S.
Vineeta, K.
Kumar, A.
Powiązania:: https://bibliotekanauki.pl/articles/411895.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Event-horizon
AGN
Entropy & Energy
Opis:: Aims: To derive an expression for change in entropy of spinning black holes on the basis of the model for the energy of spinning black holes E _BHs= K_BHs R'_s ( Mahto et al. 2011a) & the model for entropy change δS _bh = [wzór]δE ( Mahto et al. 2011b) and then calculate their values for different test spinning black holes. Study Design: Data for the mass of black holes have collected from the research paper entitled :Super massive Black Holes in Galactic Nuclei: Past Present & Future Research(2005), Space Science Reviews by L. Ferrarese & H. Ford and Black holes in Astrophysics(2005), New Journal Physics by R. Narayan. The data for black hole constant for spinning black holes (K_BHs = 1.214x10⁴⁴) is taken from the paper entitled: Study of Schwarzschild radius with reference to the spinning black holes. Bulletin of Pure and Applied Sciences (2011a). Place and Duration of Study: Department of Physics, Marwari College Bhagalpur and University Department of Physics, T.M.B.U. Bhagalpur, between December 2013 and March 2014. Methodology: A theoretical based work using Laptop to calculate the calculation for change in entropy of different test spinning black holes at Marwari College Bhagalpur and the residential research chamber of the first author. Results: The calculation shows that the change in entropy of spinning black holes of the rest masses for stellar – mass black holes (M ~ 5 – 20 Mʘ) in X-ray binaries is 2.483x10 ⁶³ to 39.731x10 ⁶³ J/K and for the super massive Black holes (M ~ 10⁶ – 10^9.5 Mʘ) in active galactic nuclei is 9.932x10 ⁷³ to 28.432x10 ⁸⁰ J/K. The nature of the graph for XRBs is the same to the Hawking entropy with the event horizon and straight line for AGN which confirms the validity of equations E_BHs=K_BHs R’_{s_{and δS _bh = [wzór]δE .Conclusion: The change in energy and entropy of black holes are mainly dependent on the mass and independent of their event horizons.}}
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 13, 2; 95-103
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: High Pressure Phase Transition and Allied Behavior οf Samarium Compounds
Autorzy:: Singh, M.
Gour, A.
Singh, S.
Powiązania:: https://bibliotekanauki.pl/articles/1400142.pdf
Data publikacji:: 2013-04
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 61.50.Ks
61.50.Lt
61.66.-f
62.20.-x
Opis:: A theoretical study of the phase transition of samarium monochalcogenides using three-body interaction potential model is carried out at high pressure. The three-body interaction potential includes long range Coulombic, three-body interaction forces and short range overlap repulsive forces operative up to next nearest neighbor ions. We have investigated phase transition pressures, volume collapses, elastic behavior, stability criteria and various thermo physical properties at various high pressure. The results found are well suited with available experimental data. In this paper third order elastic constants are also reported for the first time which helps in understanding the nature of interionic forces in ionic solids which paved the experimentalist to work in specific direction.
Źródło:: Acta Physica Polonica A; 2013, 123, 4; 709-713
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Static, vibration and buckling analysis of skew composite and sandwich plates under thermo mechanical loading
Autorzy:: Singh, S. K.
Chakrabarti, A.
Powiązania:: https://bibliotekanauki.pl/articles/264605.pdf
Data publikacji:: 2013
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: metoda elementów skończonych
obciążenie cieplne
płyta warstwowa
skew plate
finite element
refined theory
thermal load
Opis:: Static, vibration and buckling behavior of laminated composite and sandwich skew plates is studied using an efficient C0 FE model developed based on refined higher order zigzag theory. The C0 FE model satisfies the interlaminar shear stress continuity at the interfaces and zero transverse shear stress conditions at plate top and bottom. In this model, the first derivatives of transverse displacement have been treated as independent variables to overcome the problem of C1 continuity associated with the plate theory. The C0 continuity of the present element is compensated in the stiffness matrix formulation by adding a suitable term. In order to avoid stress oscillations observed in the displacement based finite element, the stress field derived from temperature is made consistent with the total strain field by using field consistent approach. Numerical results are presented for different static, vibration and buckling problems by applying the FE model under thermo mechanical loading, where a nine noded C0 continuous isoparametric element is used. It is observed that there are very few results available in the literature on laminated composite and sandwich skew plates based on refined theories. As such many new results are also generated for future reference.
Źródło:: International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 887-898
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: First report of the earthworm Pontoscolex corethrurus (Müller, 1857) from Punjab, India
Autorzy:: Singh, S.
Singh, J.
Sharma, A.
Pal Vig, A.
Shakoor, A.
Powiązania:: https://bibliotekanauki.pl/articles/11913.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Źródło:: International Letters of Natural Sciences; 2018, 68
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Application of a Fuzzy Inference System for the Optimization of Material Removal Rate and Multiple Surface Roughness Characteristics in the Machining of GFRP Polyester Composites
Autorzy:: Singh, A.
Datta, S.
Mahapatra, S. S.
Powiązania:: https://bibliotekanauki.pl/articles/375921.pdf
Data publikacji:: 2013
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:: GFRP
DOE
Fuzzy Inference System (FIS)
Taguchi method
Opis:: This paper presents a multi-objective extended optimization methodology applied in the machining of a randomly oriented GFRP rod. Design of Experiment (DOE) has been selected based on a L9 orthogonal array design with varying process control parameters like: spindle speed, feed rate and depth of cut. Multiple surface roughness parameters of the machined FRP product along with the Material Removal Rate (MRR) of the machining process have been optimized simultaneously. The Fuzzy Inference System (FIS) has been proposed for providing feasible means for the meaningful aggregation of multiple objective unctions into an equivalent single performance index (MPCI). This Multi-Performance Characteristic Index (MPCI) has been optimized using the Taguchi method. The approach adapted here is capable of overcoming limitations/assumptions of existing optimization methodologies available in the literature.
Źródło:: Decision Making in Manufacturing and Services; 2013, 7, 1-2; 19-42
1896-8325
2300-7087
Pojawia się w:: Decision Making in Manufacturing and Services
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Chaotic convection of viscoelastic fluid in porous medium under G-jitter
Autorzy:: Bhadauria, B. S.
Singh, A.
Singh, M. K.
Powiązania:: https://bibliotekanauki.pl/articles/265559.pdf
Data publikacji:: 2019
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: teoria nieliniowa
grawitacja
konwekcja
non-linear theory
gravity modulation
chaotic convection
Opis:: The present article aims at investigating the effect of gravity modulation on chaotic convection of a viscoelastic fluid in porous media. For this, the problem is reduced into Lorenz system (non-autonomous) by employing the truncated Galerkin expansion method. The system shows transitions from periodic to chaotic behavior on increasing the scaled Rayleigh number R. The amplitude of modulation advances the chaotic nature in the system while the frequency of modulation has a tendency to delay the chaotic behavior which is in good agreement with the results due to [1]. The behavior of the scaled relaxation and retardation parameter on the system is also studied. The phase portrait and time domain diagrams of the Lorenz system for suitable parameter values have been used to analyze the system.
Źródło:: International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 37-51
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Asymptotic approximations to the non-isothermal distributed activation energy model for bio-mass pyrolysis
Autorzy:: Dhaundiyal, A.
Singh, S. B.
Powiązania:: https://bibliotekanauki.pl/articles/386522.pdf
Data publikacji:: 2017
Wydawca:: Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:: biomass pyrolysis
distributed activation energy model (DAEM)
DAEM
non-isothermal kinetics
gamma distribution
asymptotic expansion
erlang distribution
Opis:: This paper describes the influence of some parameters significant to biomass pyrolysis on the numerical solutions of the non-isothermal nth order distributed activation energy model (DAEM) using the Gamma distribution and discusses the special case for the positive integer value of the scale parameter (), i.e. the Erlang distribution. Investigated parameters are the integral upper limit, the frequency factor, the heating rate, the reaction order, and the shape and rate parameters of the Gamma distribution. Influence of these parameters has been considered for the determination of the kinetic parameters of the non-isothermal nth order Gamma distribution from the experimentally derived thermoanalytical data of biomass pyrolysis. Mathematically, the effect of parameters on numerical solution is also used for predicting the behaviour of the unpyrolysized fraction of biomass with respect to temperature. Analysis of the mathematical model is based upon asymptotic expansions, which leads to the systematic methods for efficient way to determine the accurate approximations. The proposed method, therefore, provides a rapid and highly effective way for estimating the kinetic parameters and the distribution of activation energies.
Źródło:: Acta Mechanica et Automatica; 2017, 11, 4; 293-301
1898-4088
2300-5319
Pojawia się w:: Acta Mechanica et Automatica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Stability analysis and internal heating effect on oscillatory convection in a viscoelastic fluid saturated porous medium under gravity modulation
Autorzy:: Bhadauria, B. S.
Singh, M. K.
Singh, A.
Singh, B. K.
Kiran, P.
Powiązania:: https://bibliotekanauki.pl/articles/265014.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: analiza stabilności
grawitacja
ciecz lepkosprężysta
nonlinear stability analysis
complex Ginzburg-Landau equation
gravity modulation
internal heating
bifurcation
Opis:: In this paper, we investigate the combined effect of internal heating and time periodic gravity modulation in a viscoelastic fluid saturated porous medium by reducing the problem into a complex non-autonomous Ginzgburg-Landau equation. Weak nonlinear stability analysis has been performed by using power series expansion in terms of the amplitude of gravity modulation, which is assumed to be small. The Nusselt number is obtained in terms of the amplitude for oscillatory mode of convection. The influence of viscoelastic parameters on heat transfer has been discussed. Gravity modulation is found to have a destabilizing effect at low frequencies and a stabilizing effect at high frequencies. Finally, it is found that overstability advances the onset of convection, more with internal heating. The conditions for which the complex Ginzgburg-Landau equation undergoes Hopf bifurcation and the amplitude equation undergoes supercritical pitchfork bifurcation are studied.
Źródło:: International Journal of Applied Mechanics and Engineering; 2016, 21, 4; 785-803
1734-4492
2353-9003
Pojawia się w:: International Journal of Applied Mechanics and Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Conservation of the endangered medicinal plant Picrorhiza kurroa through in vitro multiple shoot regeneration
Autorzy:: Chaudhary, V.
Singh, S.
Sharma, R.
Singh, A.
Sharma, N.
Powiązania:: https://bibliotekanauki.pl/articles/80933.pdf
Data publikacji:: 2019
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: medicinal plant
Picrorhiza kurroa
endangered plant
shoot regeneration
micropropagation
conservation
Źródło:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2019, 100, 3
0860-7796
Pojawia się w:: BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: TBI Calculations of the Elastic Properties and Structural Phase Transformation in Novel Materials: Yttrium Nitride
Autorzy:: Singh, S.
Chauhan, R.
Gour, A.
Powiązania:: https://bibliotekanauki.pl/articles/1492770.pdf
Data publikacji:: 2011-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 64.70.K-
62.20.de
62.50.-p
Opis:: We have carried out high pressure theoretical structural studies of yttrium nitride to examine the phase transition phenomena from the NaCl structure to CsCl structure by using a three-body potential model. The phase transition pressure (140 GPa) predicted by this approach is close to the phase transition pressure, predicted by others (138 GPa). Yttrium nitride is a novel and less explored material. Under high pressure yttrium nitride goes through a sudden collapse in volume showing the first order phase transition. To understand the effect of pressure we studied bulk properties, elastic constants and their combination. The pressure volume equation of state provides meaningful signatures of physical and chemical phenomena under high pressure. Moreover we have successfully checked the stability criterion for this compound.
Źródło:: Acta Physica Polonica A; 2011, 120, 6; 1021-1025
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Reliability analysis and prediction for time to failure distribution of an automobile crankshaft
Analiza niezawodności i przewidywanie rozkładu czasu do uszkodzenia wału korbowego pojazdu samochodowego
Autorzy:: Singh, S. S. K.
Abdullah, S.
Mohamed, N. A. N.
Powiązania:: https://bibliotekanauki.pl/articles/301436.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:: reliability
time to failure
monotonic function
hazard rate
niezawodność
czas do uszkodzenia
funkcja monotoniczna
wskaźnik zagrożenia
Opis:: This paper emphasizes on analysing and predicting the reliability of an automobile crankshaft by analysing the time to failure (TTF) through the parametric distribution function. The TTF was modelled to predict the likelihood of failure for crankshaft during its operational condition over a given time interval through the development of the stochastic algorithm. The developed stochastic algorithm has the capability to measure the parametric distribution function and validate the predict the reliability rate, mean time to failure and hazard rate. T, the algorithm has the capability to statistically validate the algorithm to obtain the optimal parametric model to represent the failure of the component against the actual time to failure data from the local automobile industry. Hence, the validated results showed that the three parameter Weibull distribution provided an accurate and efficient foundation in modelling the reliability rate when compared with the actual sampling data. The suggested parametric distribution function can be used to improve the design and the life cycle due to its capability in accelerating and decelerating the mechanism of failure based on time without adjusting the level of stress. Therefore, an understanding of the parametric distribution posed by the reliability and hazard rate onto the component can be used to improve the design and increase the life cycle based on the dependability of the component over a given period of time. The proposed reliability assessment through the developed stochastic algorithm provides an accurate, efficient, fast and cost effective reliability analysis in contrast to costly and lengthy experimental techniques.
W prezentowanej pracy przedstawiono metodę analizy oraz predykcji niezawodności wału korbowego pojazdu samochodowego opartą na analizie czasu do uszkodzenia (TTF) z wykorzystaniem funkcji rozkładu parametrycznego. W artykule, stworzono model TTF pozwalający na przewidywanie prawdopodobieństwa uszkodzenia wału korbowego w stanie pracy w danym przedziale czasu za pomocą nowo opracowanego algorytmu stochastycznego. Opracowany algorytm stochastyczny umożliwia mierzenie funkcji rozkładu parametrycznego oraz weryfikację przewidywanego współczynnika niezawodności, średniego czasu do uszkodzenia oraz współczynnika zagrożenia. Algorytm daje możliwość statystycznej weryfikacji modelu w odniesieniu do rzeczywistych danych dotyczących czasu do uszkodzenia pochodzących z lokalnego przemysłu samochodowego. Weryfikacja taka pozwala na otrzymanie optymalnego modelu parametrycznego reprezentującego uszkodzenie części składowej. Zweryfikowane wyniki wykazały, że trójparametrowy rozkład Weibulla stanowi dokładne i wydajne narzędzie do modelowania współczynnika niezawodności w zestawieniu z rzeczywistymi danymi z próby. Proponowaną dystrybuantę parametryczną można wykorzystywać do doskonalenia konstrukcji oraz cyklu życia wału korbowego ponieważ daje ona możliwość przyspieszania i zwalniania mechanizmu uszkodzenia, na podstawie czasu, bez potrzeby regulacji poziomu naprężenia. Zatem, znajomość rozkładu parametrycznego oraz obliczonych na jego podstawie współczynników niezawodności i zagrożenia omawianego elementu mechanizmu korbowego, pozwala na doskonalenie konstrukcji oraz wydłużenie cyklu życia wału korbowego w oparciu o dane dotyczące jego niezawodności w danym okresie czasu. Proponowana metoda oceny niezawodności z wykorzystaniem opracowanego w artykule algorytmu stochastycznego umożliwia dokładną, wydajną, szybką i tanią analizę niezawodności w odróżnieniu od kosztownych i czasochłonnych technik eksperymentalnych.
Źródło:: Eksploatacja i Niezawodność; 2015, 17, 3; 408-415
1507-2711
Pojawia się w:: Eksploatacja i Niezawodność
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Management of sugar industrial wastes through vermitechnology
Autorzy:: Bhat, S.A.
Singh, J.
Vig, A.P.
Powiązania:: https://bibliotekanauki.pl/articles/11795.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Opis:: The present paper discusses the role of earthworms in recycling of sugar industrial wastes. The wastes generated from sugar industry are pressmud, bagasse, bagasse fly ash, sugar cane trash, sugar beet mud, sugar beet pulp, molasses etc. These wastes when mixed with other organic substrates become ideal mixtures for growth of earthworms. These wastes if stored in open field’s causes contamination in the environment and may cause several diseases in public health. But the governments have been unable to tackle the menace of solid waste pollution due to dearth of appropriate technologies, finance and space. Therefore, environment friendly and cost effective technologies for nutrient recycling or remediation of wastes are being advocated as an alternative means for conserving and replenishing natural resources of the ecosystems. Vermicomposting is one such technology that synergises microbial degradation with earthworm’s activity for reducing, reusing and recycling waste materials in a shorter span of time. Earthworm technology can convert sugar industrial wastes into valuable fertilizing material. The final product (vermicompost) produced during the process of vermicomposting is nutrient rich organic fertilizer with plant available nutrients such as nitrogen, potassium, calcium and phosphorus. In the present study an attempt has been made to document the role of earthworms in reuse of sugar industry waste.
Źródło:: International Letters of Natural Sciences; 2016, 55
2300-9675
Pojawia się w:: International Letters of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: Modelling and Experimental Characterization of Processing Parameters in Vertical Twin Roll Casting of Aluminium Alloy A356
Autorzy:: Dhindaw, B.
Singh, S.
Mandal, A.
Pandey, A.
Powiązania:: https://bibliotekanauki.pl/articles/1840923.pdf
Data publikacji:: 2020
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: alloy A356
structural materials
microstructures
vertical twin-roll casting
roll speeds
numerical modelling
stop A356
mikrostruktura
odlewanie dwuwalcowe
prędkości rolek
modelowanie numeryczne
Opis:: Production of near net shape thin strips using vertical twin roll casting method has been studied. In a typical VTRC process, the simultaneous action of solidification and rolling makes the process quite attractive as well as complicated. An industrially popular alloy A356 has been chosen for the VTRC processing. It is challenging to identify VTRC processing parameters for the alloy to produce thin strips because of its freezing range and complex composition. In the present work processing parameters of VTRC like roll speed, roll gap, melt superheat and the interface convective heat transfer coefficient have been investigated through modelling of the process. The mathematical model was developed which simultaneously solves the heat transfer, fluid flow and solidification, using commercial software COMSOL Multiphysics 5.4. VTRC sheets of alloy A356 were produced in an experimental set up and attempts were made to correlate the microstructures of VTRC A356 alloy to that predicted from the numerical studies to validate the model.
Źródło:: Archives of Foundry Engineering; 2020, 20, 4; 121-132
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Sustainable soil stabilization using combination of geotextile, fly-ash and saw dust for pavement subgrade
Autorzy:: Sahak, A.
Singh, M.
Adhikari, A.
Hussain, S.
Powiązania:: https://bibliotekanauki.pl/articles/2175780.pdf
Data publikacji:: 2021
Wydawca:: Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
Tematy:: soil stabilization
sawdust
fly-ash
geotextile
unconfined compressive strength
stabilizacja gruntu
trociny
popiół lotny
geotekstylia
wytrzymałość na ściskanie
Opis:: Purpose: This paper investigates the combined effect of fly ash, sawdust and geotextile in stabilizing the soil. Design/methodology/approach: A thorough geotechnical testing was carried out in order to study the potent characteristics of soil and soil mixes. The present investigation was set up in two stages. In the first stage, effects of fly ash (5, 10, 15 and 20%), sawdust (2.5, 5 and 7.5%) and layers of geotextile placed at different depths were studied separately to determine their effect on soil stabilization. In the second stage, fly ash, sawdust and geotextile were mixed with soil sample in order to obtain the optimum dosage which can be used for stabilization of soil i.e. their combined effect as stabilizer on soil stabilization. Findings: It was observed that by introducing fly ash, sawdust and geotextile to the soil, the CBR values increase and thickness of pavement layer decreases. It also decreases the amount of stress on subgrade leading to enhancement of pavement stability with cost effectiveness. Research limitations/implications: Economical use of industrial waste has been proposed in the present research which otherwise prove to be a malady to climatic change and human health. From the study, an optimum dosage of fly ash (2.5%) and saw dust (5%) and depth for geotextile (6 cm) has been proposed. Originality/value: The article explores the possibility of a ternary blend, i.e., geotextile, fly-ash and saw dust on effectively stabilizing pavement subgrade. Limited literature was available to address the issue of utilizing the industrial wastes that otherwise pose disposal issues.
Źródło:: Archives of Materials Science and Engineering; 2021, 109, 1; 17--28
1897-2764
Pojawia się w:: Archives of Materials Science and Engineering
Dostawca treści:: Biblioteka Nauki