Zobrazeno 1 - 10
of 15
pro vyhledávání: '"W E Parry"'
Autor:
Richard R. A. Syms, W. E. Parry
Publikováno v:
Applied optics. 27(17)
Application de la theorie electrodynamique des perturbations conduisant a une representation diagrammatique du processus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0ba46b4fb609f0a73daa2f49660977d4
https://pubmed.ncbi.nlm.nih.gov/20539421
https://pubmed.ncbi.nlm.nih.gov/20539421
Publikováno v:
International Journal of Electronics. 46:357-365
The partial differential equation system derived in a companion paper for the vector components of the electric field in a volume phase hologram are solved in the form of an infinite series, valid for both transmission and reflection holograms. In th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f0179a4ec84e532b7fd8b0ed75baf98d
https://doi.org/10.1080/00207217908901013
https://doi.org/10.1080/00207217908901013
Autor:
W. E. Parry, Laszlo Solymar
Publikováno v:
Optical and Quantum Electronics. 9:527-531
We inv estigate the problem in which a volume hologram is produced by two waves of arbitrary amplitude and phase distribution (the only restriction being that they must obey the rules of geometrical optics), and the developed hologram is illuminated
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::69dfb437b881a0c48290ee8a7d604c8a
https://doi.org/10.1007/bf01208763
https://doi.org/10.1007/bf01208763
Autor:
Henry Foster, W. E. Parry
Publikováno v:
Abstracts of the Papers Printed in the Philosophical Transactions of the Royal Society of London. 2:293-296
In these communications are recorded all the magnetic observations made by Lieutenant Foster, alone or in conjunction with Captain Parry and the other officers of the Northwestern Expedition, in the years 1824 and 1825; and they embrace a variety of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d1d8c3fd462b5c44bbe192e8a026bc48
https://doi.org/10.1098/rspl.1815.0306
https://doi.org/10.1098/rspl.1815.0306
Publikováno v:
Journal of Physics C: Solid State Physics. 4:1387-1398
The effects are considered of finite conduction electron lifetime and finite deep hole mass on the form of the singularity at the threshold of optical absorption in metals and semiconductors. An approximation is obtained for all orders of perturbatio
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0139aa47ea1393194ee482760af324fd
https://doi.org/10.1088/0022-3719/4/11/014
https://doi.org/10.1088/0022-3719/4/11/014
Autor:
W. Brenig, W. E. Parry
Publikováno v:
Zeitschrift f�r Physik. 175:40-53
The consistency of recent experimental and theoretical analyses of liquid He4 is investigated. Further evidence is found for a strong depletion of the zero momentum state. The modifications of a Brueckner-Sawada type approximation implied by this dep
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4aeb67178d34d450b94eb998a700fc61
https://doi.org/10.1007/bf01375394
https://doi.org/10.1007/bf01375394
Autor:
W E Parry, C R Rathbone
Publikováno v:
Proceedings of the Physical Society. 91:273-278
A calculation is reported of the momentum distribution in liquid helium at absolute zero using a pair wave function and a modified superposition approximation. A value of 0 13 for the fraction of particles in the zero-momentum state is obtained. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4b591b7808a5941dc61c0fb78d3dfab9
https://doi.org/10.1088/0370-1328/91/2/302
https://doi.org/10.1088/0370-1328/91/2/302
Some Analytic Properties of Green Functions and Self‐Energy Parts for a System of Interacting Bosons
Autor:
W. E. Parry, R. E. Turner
Publikováno v:
Journal of Mathematical Physics. 4:530-533
Some analytic properties of the single‐particle Green functions and proper self‐energy parts for a system of interacting bosons at nonzero temperatures are derived. In particular, it is shown how to obtain the analytical continuations of simple f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c37d47a77ec52e93da2f6767b7b8f1f9
https://doi.org/10.1063/1.1703987
https://doi.org/10.1063/1.1703987
Autor:
R E Turner, W E Parry
Publikováno v:
Reports on Progress in Physics. 27:23-52
Thermodynamic perturbation theory is described in terms of temperature-dependent Green functions. The relationship of these functions with time-temperature-dependent Green functions and with correlation functions is discussed and some of their analyt
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::add05c01101a7f224a7656fa54622e12
https://doi.org/10.1088/0034-4885/27/1/302
https://doi.org/10.1088/0034-4885/27/1/302
Autor:
W. E. Parry, R. E. Turner
Publikováno v:
Physical Review. 128:929-932
An extension to nonzero temperatares of the HugenholtzPines procedure for the degenerate Bose gas is provided. It is shown that under certain conditions the elementary excitation spectrum must approach zero for zero momentum, at nonzero, as well as a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::96def6b35c773b39daca34d47afb719a
https://doi.org/10.1103/physrev.128.929
https://doi.org/10.1103/physrev.128.929