Zobrazeno 1 - 10
of 92
pro vyhledávání: '"Billyard, A. P."'
Autor:
Thomas Billyard
Publikováno v:
Indian Journal of Respiratory Care, Vol 10, Iss 4, Pp 39-42 (2021)
Covid-19 disease is typified by respiratory symptoms. In severe cases respiratory failure occurs and must be carefully managed. Management can include supplementary oxygen therapy, non-invasive and invasive ventilation. In this article we describe th
Externí odkaz:
https://doaj.org/article/133f582bee7d43289f5f40bbf0e8eddf
Autor:
Akhtar, Waqas, Marshal, Lenster, Buglass, Helen, Billyard, Thomas, Goedvolk, Charlotte, Mildner, Reinout, Conway, Hannah, Soliman Aboumarie, Hatem, Miller, Ashley, Peck, Marcus, Rubino, Antonio
Publikováno v:
Journal of the Intensive Care Society; November 2024, Vol. 25 Issue: 4 p407-409, 3p
Autor:
Billyard, Andrew P., Sajko, William N.
Publikováno v:
Gen.Rel.Grav. 33 (2001) 1929-1952
We examine generalizations of the five-dimensional canonical metric by including a dependence of the extra coordinate in the four-dimensional metric. We discuss a more appropriate way to interpret the four-dimensional energy-momentum tensor induced f
Externí odkaz:
http://arxiv.org/abs/gr-qc/0105074
Publikováno v:
J.Math.Phys. 41 (2000) 6277-6283
We study early universe cosmologies derived from a scalar-tensor action containing cosmological constant terms and massless fields. The governing equations can be written as a dynamical system which contains no past or future asymptotic equilibrium s
Externí odkaz:
http://arxiv.org/abs/gr-qc/0005118
Publikováno v:
Class.Quant.Grav. 17 (2000) 453-484
A complete qualitative study of the dynamics of string cosmologies is presented for the class of isotopic curvature universes. These models are of Bianchi types I, V and IX and reduce to the general class of Friedmann-Robertson-Walker universes in th
Externí odkaz:
http://arxiv.org/abs/hep-th/9911086
Autor:
Billyard, Andrew P.
The asymptotic behaviour of two classes of scalar field cosmological models are studied using the theory of dynamical systems: general relativistic Bianchi models containing matter and a scalar field with an exponential potential and a class of spati
Externí odkaz:
http://arxiv.org/abs/gr-qc/9908067
Autor:
Billyard, Andrew P., Coley, Alan A.
Publikováno v:
Phys.Rev.D61:083503,2000
We investigate spatially flat isotropic cosmological models which contain a scalar field with an exponential potential and a perfect fluid with a linear equation of state. We include an interaction term, through which the energy of the scalar field i
Externí odkaz:
http://arxiv.org/abs/astro-ph/9908224
Publikováno v:
Phys.Rev. D61 (2000) 043504
A complete global analysis of spatially-flat, four-dimensional cosmologies derived from the type IIA string and M-theory effective actions is presented. A non--trivial Ramond-Ramond sector is included. The governing equations are written as a dynamic
Externí odkaz:
http://arxiv.org/abs/hep-th/9908102
Publikováno v:
Class.Quant.Grav.16:4035-4056,1999
We investigate in detail the qualitative behaviour of the class of Bianchi type B spatially homogeneous cosmological models in which the matter content is composed of two non-interacting components; the first component is described by a barotropic fl
Externí odkaz:
http://arxiv.org/abs/gr-qc/9907053
Publikováno v:
J.Math.Phys. 40 (1999) 5092
A qualitative analysis is presented for a class of homogeneous cosmologies derived from the string effective action when a cosmological constant is present in the matter sector of the theory. Such a term has significant effects on the qualitative dyn
Externí odkaz:
http://arxiv.org/abs/gr-qc/9907043