| Spectroscopic Research at High Pressure and Variable Temperature |
JUN 1984 |
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| Authors:
W. F. Sherman; KING'S COLL LONDON (ENGLAND)
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 | Work concentrated on the use of spectroscopic techniques to probe material held under high pressure at various temperatures with the objective of improving understanding of intermolecular forces and the material properties which depend on them. Included in the work was the development of high pressure optical cells to extend capabilities to high temperatures (1,500K) and investigations of the use of non-spectroscopic probes. (Author) |
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| Percolation and Critical Behaviour in Many Body Systems |
17 MAR 1983 |
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| Authors:
C. Domb; KING'S COLL LONDON (ENGLAND)
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| The most important problem which has been tackled in the past 3 years has been the resolution of the discrepancy between series expansions and renormalization group calculations. Many research workers in different parts of the world have been concerned with this problem. The contribution of the King's College group has been to provide additional terms in the high temperature series expansions for the n-vector model, and to analyse the results ... |
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| Further Consideration of Progressively Fracturing Solids |
OCT 1980 |
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| Authors:
John W. Dougill; M. A. M. Rida; KING'S COLL LONDON (ENGLAND)
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| A material idealization in which degradation of stiffness leads to nonlinear behavior and strain softening is described. Such a model may have applications with materials such as nonwoven fabrics, rocks, concrete, etc. The theory is developed partly by analogy with the theory of hardening plasticity, and completed by establishing how the change of stiffness can be found for any given history of deformation. Examples are given with the idealization being ... |
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| Percolation and Critical Behaviour in Many Body Systems. |
NOV 1979 |
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| Authors:
C. Domb; KING'S COLL LONDON (ENGLAND)
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| Many of the gaps in the scaling theory of percolation clusters for random systems have been filled during the past three years. These have led to a better understanding of the statistics of lattice animals, and of the nature of the percolation transition. Calculations have been undertaken to determine parameters which characterize the structure of the infinite percolating cluster. Investigations have been initiated of the properties of systems with correlated ... |
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| A Tool to Collect Rock Samples for Scanning Electron Microscopy |
SEP 1977 |
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| Authors:
Ian Joslin; KING'S COLL LONDON (ENGLAND)
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| A small corer has been designed which enables samples of lightly cemented carbonate rocks to be oriented and mounted on scanning electron microscope stubs in the field. (AA) |
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| Controls of Variation in Suspended Sediment Concentration in the River Rother, West Sussex, England |
JUN 1977 |
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| Authors:
P. A. Wood; KING'S COLL LONDON (ENGLAND)
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| Suspended sediment concentrations were determined for samples collected from the River Rother, West Sussex, and rating loops constructed for several hydrographs. The rating loops often exhibit hysteresis with a greater suspended sediment concentration (for a given discharge) become progressively reduced when storm events occur in rapid succession. Various types of rating curves can be identified, and a model of suspended sediment concentration and discharge constructed. Controlling factors of suspended sediment ... |
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| Percolation and Critical Behaviour in Many Body Systems. |
OCT 1976 |
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| Authors:
C. Domb; KING'S COLL LONDON (ENGLAND)
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| Earlier studies of percolation processes have been extended and the techniques applied to make a comprehensive study of the critical properties of random mixtures in three dimensions. Because of the theoretical interest, particularly in scaling theory, the investigation has been further extended to hyperdimensional mixtures and also to mixtures which are not random but determined by energetic considerations. The basic data has also been used for studies of the lattice ... |
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| Critical Behaviour in Many Body Systems. |
JUL 1974 |
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| Authors:
C. Domb; KING'S COLL LONDON (ENGLAND)
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| This work has been concentrated on a detailed study of low temperature (and high field) expansions for the simple Ising model. Methods were considered for their derivation and derived long series; these have been analyzed to provide evidence on critical indices. Also studied were the derivation of series expansions for the Ising model with spin S > 1/2 and the corresponding low temperature behavior. Also reported is a study of ... |
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| A SELF CONSISTENT THEORY OF TRIGGERED VLF EMISSIONS, IN: AGARD CP-138,PAPER NO19 |
MAY 1974 |
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| Authors:
D. NUNN; KING'S COLL LONDON (ENGLAND)
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| Calculation of Physical Properties of Co-operative Assemblies. |
MAR 1972 |
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| Authors:
C. Domb; KING'S COLL LONDON (ENGLAND)
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| This seven part report is concerned with a detailed study of the susceptibility of the Ising model. Extensive series data above and below the critical temperature for two and three dimensional lattices are derived. This data permits elucidation of the critical behavior of the susceptibility and theoretical accounting for the salient properties of the coefficients in terms of ferromagnetic and antiferromagnetic singularities. Methods are developed for deriving the number of ... |
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| CALCULATION OF PHYSICAL PROPERTIES OF CO-OPERATIVE ASSEMBLIES. |
MAY 1968 |
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| Authors:
C. Domb; KING'S COLL LONDON (ENGLAND)
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| The aim of this research is to study the critical behavior of systems which undergo discontinuous phase transitions. The critical behavior of the Ising Model above and below the critical temperature with an investigation of the susceptibility and its higher derivatives is reported. The specific heat of the Ising Model below the critical temperature is investigated and a representation constructed. Theoretical work on the anisotropic classical Heisenberg Model is reported. ... |
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| PLASMA PHYSICS IN AN ASTROPHYSICAL ENVIRONMENT. |
DEC 1966 |
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| Authors:
KING'S COLL LONDON (ENGLAND)
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| The stabilizing influence of a magnetic field on a differentially rotating star has been investigated and it has been demonstrated that a field of one gauss or more can prevent the development of a high degree of non uniform rotation during the early contactional stages of a star's evolution, and so prevent the formation of double stars. The effect of uniform rotation on the non radial modes of oscillation of ... |
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| INFLUENCE OF IONIC SOLUTES UPON RELAXATION TIMES, |
JUL 1964 |
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| Authors:
V. Gold; KING'S COLL LONDON (ENGLAND)
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| Sin-lattice relaxation times were measured by the 'direct' N.M.R. method for dilute aqueous solutions of Ni(II) in presence of cyanide, halide, acetone, t-butyl alcohol, trimethyl phosphate, edta and trien, for some of these solutes in the absence of paramagnetic ions. Spin-spin relaxation times were used to measure the influence of hydrogen ions on complex formation between water and acetaldehyde or pyruvic acid. Complex formation between methanol and other solvents through ... |
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| THE INVESTIGATION OF A SET OF WEAKENED FIELD EQUATIONS FOR GENERAL RELATIVITY, |
21 AUG 1963 |
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| Authors:
A. H. Thompson; KING'S COLL LONDON (ENGLAND)
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| General relativity is considered with an alternative set of field equations. These equations are weaker than the Einstein equations in the sense that spaces which are interpreted as the gravitational field in vacuo in the orthodox theory form only a sub-set of such spaces for these field equations. The discussion is confined to the case of the gravitational field in vacuo, but in an appendix an introduction to the way ... |
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| COORDINATION CHEMISTRY OF GROUP III. |
MAR 1963 |
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| Authors:
N.N. Greenwood; KING'S COLL LONDON (ENGLAND)
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| ASYMPTOTIC PROPERTIES OF FIELDS AND SPACE-TIMES, |
14 DEC 1962 |
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| Authors:
Roger Penrose; KING'S COLL LONDON (ENGLAND)
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| A new technique for studying asymptotic questions in general relativity is presented. Points at infinity are introduced which constitute a null hypersurface boundary to space-time. This is studied from the point of view of its conformal structure and some new light is shed on the following questions: (1) asymptotic flatness, (2) gravitational radiation fields, (3) peeling off property of the Riemann tensor, (4) total energy-momentum with integral conservation laws, (5) ... |
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| THE LIGHT-CONE AT INFINITY, |
14 DEC 1962 |
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| Authors:
Roger Penrose; KING'S COLL LONDON (ENGLAND)
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| From the point of view of the conformal structure of space-time, points at infinity can be treated on the same basis as finite points. Minkowski space can be completed to a highly symmetrical conformal manifold by the addition of a null cone at infinity - the absolute cone. Owing to their conformal invariance, zero rest-mass fields can be studied on the whole of this conformal manifold. The behaviour of the ... |
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| GEOMETRICAL AND PHYSICAL INTERPRETATION OF THE WEYL CONFORMAL CURVATURE TENSOR |
01 MAY 1961 |
1 pages |
| Authors:
F.A.E. PIRANI; A. SCHILD; KING'S COLL LONDON (ENGLAND)
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 | The Weyl (conformal curvature) tensor of spacetime is interpreted geometrically in terms of the behaviour of congruences of null geodesics. The corresponding physical interpretation provides, in principle, a means for the measurement of physical components of the Weyl tensor with light rays alone, without the use of clocks or rigid rods. (Author) |
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| SURVEY OF GRAVITATIONAL RADIATION THEORY |
27 JUN 1960 |
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| Authors:
F.A.E. PIRANI; KING'S COLL LONDON (ENGLAND)
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| A survey, to early 1960, of the convariant part of gravitational radiation theory is presented. This survey is aimed at at those with a working knowledge o general relativity. Approaches to gravitational ra iation problems through weak field and other approximation methods and through the use of special co rdinate conditions are not discussed. Most attention is given to (1) the theory of gravitational wave-fronts; (2) the algebraic and differential ... |
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| RECURRENT RADIATION IN GENERAL RELATIVITY. |
20 JUN 1960 |
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| Authors:
D. W. Sciama; KING'S COLL LONDON (ENGLAND)
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| Space-times which are recurrent Riemann spaces (in the sense of Ruse and Walker) are examined and their relation to plane wave space-times is described. (Author) |
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