Results 31 to 40 of about 2,199,245 (317)
Energy conditions and cosmic acceleration [PDF]
Physical Review D, 2007 In general relativity, the energy conditions are invoked to restrict general energy-momentum tensors $T_{μν}$ in different frameworks, and to derive general results that hold in a variety of general contexts on physical grounds. We show that in the standard Friedmann-Lemaitre-Robertson-Walker (FLRW) approach, where the equation of state of the ...
Santos, J. +3 more
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Nanocomposites, 2023 In this work, Ni-W/diamond composite alloy coatings were successfully fabricated on low carbon steel by using direct current (DC) electrodeposition. The Ni-W molar ratio was varied in the range of 0.22–2 in the plating bath. The effect of variation of Ni-
Malay Kumar Das +2 more
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Casimir energies and general relativity energy conditions [PDF]
Journal of Physics A: Mathematical and General, 2006 10 pages, 7 .eps figures; To appear in the proceedings of QFEXT '05 ...
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Derivation of the null energy condition
Physical Review D, 2015 We derive the null energy condition, understood as a constraint on the Einstein-frame Ricci tensor, from worldsheet string theory. For a closed bosonic string propagating in a curved geometry, the spacetime interpretation of the Virasoro constraint condition is precisely the null energy condition, to leading nontrivial order in the alpha-prime ...
Parikh, M., van der Schaar, J.P.
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Local conditions for the decentralization of energy systems [PDF]
Regional Studies, 2022 Local energy systems (LES) are designed to decarbonize, balance, and coordinate supply, storage and demand resources. Which local conditions enable LES to flourish? Using a unique dataset of 146 LES projects in the UK from 2010 to 2020, we apply econometric methods to identify energy, institutional and socio-economic conditions significantly associated
Arvanitopoulos, Theodoros +2 more
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Energy Dissipated in Fatigue and Creep Conditions [PDF]
Materials, 2021 The paper presents the results of tests performed on samples made of P91 steel under combined variable and constant load conditions, at temperature T = 600 °C. The analysis of the test results was carried out with the use of the energetic description of the fatigue process.
Stanisław Mroziński +2 more
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Evaluation of the potential of osmotic energy as renewable energy source in realistic conditions
, 2022 261269The possibility of using osmotic energy as renewable energy source is discussed here, and some experimental results at realistic operating conditions are presented.
Touati, K., Schiestel, Thomas
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Averaged energy conditions and quantum inequalities [PDF]
Physical Review D, 1995 20pp, plain LATEX, TUTP-94 ...
Ford, L. H., Roman, Thomas A.
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Meteorological conditions leading to extreme low variable renewable energy production and extreme high energy shortfall [PDF]
, 2019 To mitigate climate change a renewable energy transition is needed. Existing power systems will need to be redesigned to balance variable renewable energy production with variable energy demand.
Sub Algorithmic Data Analysis +14 more
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Energy conditions and supernovae observations
Physical Review D, 2006 4 pages, 2 figures; v2: References added, misprints corrected, published in Phys.Rev.D in the present ...
Santos, J. +2 more
openaire +2 more sources