Zobrazeno 1 - 10 of 94 pro vyhledávání: '"Charles E Campbell"'
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The use of autorefractors using the image-size principle in determining on-axis and off-axis refraction. Part 1: Analysis of optical principles of autorefractors
Autor: Charles E Campbell, Marwan Suheimat, Stanislovas Zacharovas, David A Atchison
Publikováno v: Ophthalmicphysiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)REFERENCES. 42(2)
To study the optical principles and properties of autorefractors that use the image-size principle in which the size of the reimaged retinal image determines refraction.The retinal illumination and reimaging of the retinal image were described, as we
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7945eefad7399ba7fe6bcf16f3c4b103
https://pubmed.ncbi.nlm.nih.gov/34927742
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4
Superfluid 4He dynamics beyond quasiparticle excitations
Autor: H.J. Lauter, Charles E Campbell, K. Beauvois, T. Lichtenegger, Javier Dawidowski, H. Godfrin, B. Fåk, Jacques Ollivier, A. Sultan, Eckhard Krotscheck
Publikováno v: Physical Review B
Physical Review B, American Physical Society, 2016, 94 (2), pp.024504. ⟨10.1103/PhysRevB.94.024504⟩
Physical Review B, 2016, 94 (2), pp.024504. ⟨10.1103/PhysRevB.94.024504⟩
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Consejo Nacional de Investigaciones Científicas y Técnicas
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The dynamics of superfluid 4He at and above the Landau quasiparticle regime is investigated by high precision inelastic neutron scattering measurements of the dynamic structure factor. A highly structured response is observed above the familiar phono
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::810c990a747bf74e8e7355e38cef3710
https://hal.archives-ouvertes.fr/hal-01361110
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5
Frustrated Heisenberg antiferromagnet on the honeycomb lattice with spin quantum number s ≥ 1
Autor: Charles E Campbell, P. H. Y. Li, Raymond F. Bishop
Publikováno v: Li, P H Y, Bishop, R F & Campbell, C E 2016, ' Frustrated Heisenberg antiferromagnet on the honeycomb lattice with spin quantum number s ≥ 1 ', Journal of Physics: Conference Series, vol. 702, 012001 (19 pp) . https://doi.org/10.1088/1742-6596/702/1/012001
The ground-state (GS) phase diagram of the frustrated spin-s J1-J2-J3 Heisenberg antiferromagnet on the honeycomb lattice is studied using the coupled cluster method implemented to high orders of approximation, for spin quantum numbers s = 1, 3/2, 2
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::db702e174ecdf2f2cbc50ec857ffa758
https://doi.org/10.1088/1742-6596/702/1/012001
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6
MAGNETIC ORDERING OF ANTIFERROMAGNETS ON A SPATIALLY ANISOTROPIC TRIANGULAR LATTICE
Autor: Raymond F. Bishop, Charles E Campbell, Damian J. J. Farnell, P. H. Y. Li
Publikováno v: Bishop, R F, Li, P H Y, Farnell, D J J & Campbell, C E 2010, ' Magnetic ordering of antiferromagnets on a spatially anisotropic triangular lattice ', International Journal of Modern Physics B, vol. 24, pp. 5011-5026 . https://doi.org/10.1142/S021797921005716X
We study the spin-1/2 and spin-1 [Formula: see text] Heisenberg antiferromagnets (HAFs) on an infinite, anisotropic, two-dimensional triangular lattice, using the coupled cluster method. With respect to an underlying square-lattice geometry the model
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e6a6708188033231073b44728813472c
https://doi.org/10.1142/s021797921005716x
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7
MANY-BOSON DYNAMIC CORRELATIONS
Autor: Charles E Campbell, Eckhard Krotscheck
Publikováno v: International Journal of Modern Physics B. 22:4296-4302
In this paper we present an overview of a systematic development of the linear equations of motion for a dynamically correlated wave function that moves beyond the previous theories that include time-dependent pair correlations at most. We argue that
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b4106455e8c51e7308f1630ab600e313
https://doi.org/10.1142/s021797920805005x
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8
Unconventional magnetic vortex structures observed in micromagnetic simulations
Autor: M. Yan, Hao Wang, Charles E Campbell
Publikováno v: Journal of Magnetism and Magnetic Materials. 320:1937-1944
Very simple complex functions can give good approximate descriptions of two-dimensional magnetic vortex structures. By rotating all the spins of a common vortex by the same angle in the plane, abnormal vortex structures are obtained, which we term un
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b4648053837c4ab2e93ffe995dbe312c
https://doi.org/10.1016/j.jmmm.2008.02.170
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10
Quasiclassical magnetic order and its loss in a spin-12Heisenberg antiferromagnet on a triangular lattice with competing bonds
Autor: Raymond F. Bishop, Charles E Campbell, P. H. Y. Li
Publikováno v: Physical Review B. 91
We use the coupled cluster method (CCM) to study the zero-temperature ground-state (GS) properties of a spin-$\frac{1}{2}$ ${J}_{1}\ensuremath{-}{J}_{2}$ Heisenberg antiferromagnet on a triangular lattice with competing nearest-neighbor and next-near
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e91e0f92063a8c0b0b112a5faac5869c
https://doi.org/10.1103/physrevb.91.014426
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