Results 71 to 80 of about 157,038 (277)

Gravitational instantons

Classical and Quantum Gravity, 1997
Gravitational instantons are solutions of the Einstein field equations with Euclidean signature and anti-selfdual curvature. In this letter, the authors try to add a little bit more to our knowledge of instantons by presenting new instanton solutions of the Einstein field equations, which they obtain by means of a reduction of the complex Monge-Ampère ...
Nutku, Y, Sheftel, MB, Malykh, AA
openaire   +3 more sources

Gravitational decoherence [PDF]

Classical and Quantum Gravity, 2017
We discuss effects of loss of coherence in low energy quantum systems caused by or related to gravitation, referred to as gravitational decoherence. These effects, resulting from random metric fluctuations, for instance, promise to be accessible by relatively inexpensive table-top experiments, way before the scales where true quantum gravity effects ...
Angelo Bassi, André Großardt, Hendrik Ulbricht   +2 more
openaire   +5 more sources

Workflow for Design of Experiments‐Based Modeling of Species Transport and Growth Kinetics in GaN Hydride Vapor Phase Epitaxy

Advanced Engineering Materials, EarlyView.
A novel workflow for investigating hydride vapor phase epitaxy for GaN bulk crystal growth is proposed. It combines Design of experiments (DoE) with physical simulations of mass transport and crystal growth kinetics, serving as an intermediate step between DoE and experiments.
J. Tomkovič, G. Lukin, H. Torkashvand, A. Kerschbaum, M. Müller, S. Besendörfer, J. Heitmann, J. Friedrich   +7 more
wiley   +1 more source

Estimations of changes of the Sun's mass and the gravitation constant from the modern observations of planets and spacecraft

, 2011
More than 635 000 positional observations (mostly radiotechnical) of planets and spacecraft (1961-2010), have been used for estimating possible changes of the gravitation constant, the solar mass, and semi-major axes of planets, as well as the value of ...
A.J. Hundhausen, A.J. Hundhausen, A.S. Brun, B.E. Gel’gaft, B.G. Marsden, B.G. Marsden, B.J. Gladman, C. Frohlich, C. Frohlich, E. V. Pitjeva, E.N. Polyakhova, E.V. Pitjeva, E.V. Pitjeva, E.V. Pitjeva, G.A. Krasinsky, G.G. Nyambuya, H. Jeans, H. Poincaré, International Astronomical Union, J.-Ph. Uzan, J.-Ph. Uzan, J.C. Brandt, J.G. Williams, J.K. Kevorkian, M.-B. Kallenrode, M.E. Bailey, N. P. Pitjev, P. Farinella, P.A.M. Dirac, T. Miura, W.C. Livingston, Z. Sekanina   +31 more
core   +1 more source

Gravitational waves [PDF]

Nuclear Physics B - Proceedings Supplements, 1994
In the last few years there have been a number of significant developments in research towards the detection of gravitational radiation from astronomical objects. The construction of 3 large-scale (3- or 4-km) interferometric detectors has been funded; new high-sensitivity bars are under construction; there is a serious proposal using two ...
openaire   +4 more sources

Gravitational helioseismology? [PDF]

Physical Review D, 1996
The magnitudes of the external gravitational perturbations associated with the normal modes of the Sun are evaluated to determine whether these solar oscillations could be observed with the proposed Laser Interferometer Space Antenna (LISA), a network of satellites designed to detect gravitational radiation.
Cutler, Curt, Lindblom, Lee
openaire   +3 more sources

Direct Metal Deposition of Graphene–Ti28Nb35.4Zr Matrix Composites With Enhanced Mechanical, Corrosion, and Biocompatibility Properties for Bone Implants

Advanced Engineering Materials, EarlyView.
Graphene nanoplatelet (0.1 wt.%) reinforcement significantly enhances the performance of β Ti‐28Nb‐35.4Zr alloy. Grain refinement, reduced water contact angle, and improved surface characteristics promote osteoblast adhesion and complete surface coverage after 7 days.
Khurram Munir, Jixing Lin, Yuncang Li, Li Zhu, Paul F. A. Wright, Cuie Wen   +5 more
wiley   +1 more source

Modified model of Newtonian gravitation.

Тонкие химические технологии, 2011
Within the limits of the classical mechanics for planets of the Solar system a new form of gravitational potential is suggested. The following effects are considered: perihelion advance of the planets, deviation of light beams in the field of the Sun ...
E. Kh. Nasretdinova, E. S. Savin
doaj  

Complexity and Newton's Laws

Frontiers in Physics, 2020
In a recent note [1], I argued that the holographic origin of ordinary gravitational attraction is the quantum mechanical tendency for operators to grow under time evolution.
Leonard Susskind
doaj   +1 more source

Gravitational physics

Physics World, 1996
Gravity is truly universal. It is the force that pulls us to the Earth, that keeps the planets and moons in their orbits, and that causes the tides on the Earth to ebb and flow. It even keeps the Sun shining. Yet on a laboratory scale gravity is extremely weak.
Schäfer, G., Schutz, B.
openaire   +2 more sources