Letters written while on a collecting trip in the East Indies, by Thomas Barbour...and Mrs. Rosamond Barbour.

Barbour, Rosamond.; Barbour, Thomas

doi:10.5962/bhl.title.11927

Cited by 11 publications

(16 citation statements)

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“…a direct effect of temperature on the central nervous mechanism. This latter was the conclusion come to by Richet so far back as 1892, and is an alternative strengthened by analogy with the evidence on thermal polynaea (Richet (31)), and the results established by Barb our (1) and his subsequent co-workers (3,4,5), also by Hashi moto, from experiments with localised cooling and warming of the brain; and by observations of O' Connor and of Heymans on cooling and warming the blood supplying the head. In regard to the "central" origination of 415 shivering, one might perhaps hardly expect that it would cover cases where shivering is an adjunct, as experience shows, not only to one and the same particular blood temperature, but to temperatures varying with varying circumstances.…”

supporting

confidence: 62%

Notes on temperature after spinal transection, with some observations on shivering

Sherrington¹

1924

The Journal of Physiology

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supporting

confidence: 62%

Notes on temperature after spinal transection, with some observations on shivering

Sherrington¹

1924

The Journal of Physiology

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“…Since the coupling to matter on CS has still to be worked out in detail, we shall not explore this route further in the present paper. But it does hint at interesting possibilities (see also [7]). …”

Section: Reparametrisation-invariant Actions and Gravitymentioning

confidence: 99%

“…Thus, it appears that ξ should be treated as a 'cyclic' or 'ignorable' coordinate [8], rather than as a Lagrange multiplier (a 'position' without a 'velocity'). In fact, it will be shown in [7] that ξ, like all such variables used to implement best matching, is neither a multiplier nor a cyclic coordinate but a sui generis variable for which the variation at the end points is not fixed. The same analysis will show that in most cases, including the one considered here, the treatment as a multiplier is valid, though there are cases in which it is not.…”

Section: Reparametrisation-invariant Actions and Gravitymentioning

confidence: 99%

Relativity without relativity

Barbour¹,

Foster

Murchadha

2002

Class. Quantum Grav.

149

477

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We give a derivation of general relativity (GR) and the gauge principle that is novel in presupposing neither spacetime nor the relativity principle. We consider a class of actions defined on superspace (the space of Riemannian 3-geometries on a given bare manifold). It has two key properties. The first is symmetry under 3-diffeomorphisms. This is the only postulated symmetry, and it leads to a constraint linear in the canonical momenta. The second property is that the Lagrangian is constructed from a 'local' square root of an expression quadratic in the velocities. The square root is 'local' because it is taken before integration over 3-space. It gives rise to quadratic constraints that do not correspond to any symmetry and are not, in general, propagated by the Euler-Lagrange equations. Therefore these actions are internally inconsistent. However, one action of this form is well behaved: the Baierlein-Sharp-Wheeler (BSW [1]) reparametrisation-invariant action for GR. From this viewpoint, spacetime symmetry is emergent. It appears as a 'hidden' symmetry in the (underdetermined) solutions of the Euler-Lagrange equations, without being manifestly coded into the action itself. In addition, propagation of the linear diffeomorphism constraint together with the quadratic square-root constraint acts as a striking selection mechanism beyond pure gravity. If a scalar field is included in the configuration space, it must have the same characteristic speed as gravity. Thus Einstein causality emerges. Finally, self-consistency requires that any 3-vector field must satisfy Einstein causality, the equivalence principle and, in addition, the Gauss constraint. Therefore we recover the standard (massless) Maxwell equations.

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“…For interest and for validation the full MATLAB code for the numerical A-CAES model is available at www.energystoragesense.com/downloads [47].…”

Section: Model Specificsmentioning

confidence: 99%

Adiabatic Compressed Air Energy Storage with packed bed thermal energy storage

et al. 2015

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h i g h l i g h t sThe paper presents a thermodynamic analysis of A-CAES using packed bed regenerators. The packed beds are used to store the compression heat. A numerical model is developed, validated and used to simulate system operation. The simulated efficiencies are between 70.5% and 71.1% for continuous operation. Heat build-up in the beds reduces continuous cycle efficiency slightly. a b s t r a c tThe majority of articles on Adiabatic Compressed Air Energy Storage (A-CAES) so far have focussed on the use of indirect-contact heat exchangers and a thermal fluid in which to store the compression heat. While packed beds have been suggested, a detailed analysis of A-CAES with packed beds is lacking in the available literature. This paper presents such an analysis. We develop a numerical model of an A-CAES system with packed beds and validate it against analytical solutions. Our results suggest that an efficiency in excess of 70% should be achievable, which is higher than many of the previous estimates for A-CAES systems using indirect-contact heat exchangers. We carry out an exergy analysis for a single charge-storage-discharge cycle to see where the main losses are likely to transpire and we find that the main losses occur in the compressors and expanders (accounting for nearly 20% of the work input) rather than in the packed beds. The system is then simulated for continuous cycling and it is found that the build-up of leftover heat from previous cycles in the packed beds results in higher steady state temperature profiles of the packed beds. This leads to a small reduction (<0.5%) in efficiency for continuous operation.

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Letters written while on a collecting trip in the East Indies, by Thomas Barbour...and Mrs. Rosamond Barbour.

Cited by 11 publications

References 0 publications

Notes on temperature after spinal transection, with some observations on shivering

Notes on temperature after spinal transection, with some observations on shivering

Relativity without relativity

Adiabatic Compressed Air Energy Storage with packed bed thermal energy storage

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