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Digitale Medien

Sub-surface Temperatures on the Moon (1959)

JAEGER, J. C.

[s.l.] : Nature Publishing Group

Nature 183 (1959), S. 1316-1317

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] Information about the thermal conductivity near the surface is obtained from optical and radio microwave observations of the variation of the surface temperature during an eclipse or throughout a lunation. These yield a value of (Kpc)~112, where K, p and c are the thermal conductivity, density and ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/1831316a0

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Digitale Medien

The frictional properties of joints in rock (1959)

Jaeger, J. C.

Springer

Pure and applied geophysics 43 (1959), S. 148-158

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ISSN: 1420-9136

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Summary The conditions for sliding over artificial joint surfaces have been studied experimentally by cutting rock cylinders at various angles to their axes and studying slip over these surfaces in a triaxial testing apparatus. The types of joint used were: (i) filled with plaster to simulate a soft joint filling, (ii) bare surfaces ground approximately flat, and (iii) natural surfaces across which shear failure had taken place. The results agreed reasonably well with the simple theory for a constant coefficient of friction. Measured coefficients of friction lie in the range 0.5–0.8 and differ by surprisingly little between the various surfaces. The surfaces across which sliding has taken place exhibit interesting slickenside phenomena. Subsidiary failures frequently occur which cut across the joint surfaces.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF01993552

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Digitale Medien

The use of the cooling-history of thick intrusive sheets for the study of the secular variation of the earth's magnetic field (1956)

Jaeger, J. C. ; Green, R.

Springer

Pure and applied geophysics 35 (1956), S. 49-53

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ISSN: 1420-9136

Quelle: Springer Online Journal Archives 1860-2000

Thema: Geologie und Paläontologie , Physik

Notizen: Summary Numerical results are given which show the way in which thc Curie temperature moves inwards from the margin during the cooling of a thick intrusive sheet. The time taken to move from the margin to the centre varies as the square of the thickness of the sheet, being about 6500 years for a sheet 1000 m thick on reasonable assumptions as to the thermal properties of the material. This implies that the secular variation of the Earth's magnetic field over periods of time of 1000 years or more may be studied by measuring the directions of magnetisation at a series of points across the thickness of such a sheet. Some measurements on a Tasmanian sill about 430 m thick of Jurassic or Cretaceous age suggest a change from maximum to minimum inclination in a time of about 200 years. Since the margins of the sill are not available this figure may be considerably in error but the results suggest the general practicability of the method.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02122865

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