246 resultados para ZZ
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Signatures: A-Z⁸ Aa-Zz⁸ Aaa⁸ Bbb².
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"Liebhaber Ausgabe."
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Mode of access: Internet.
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Mode of access: Internet.
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CCBE S. XVI
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In double columns.
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Signatures: v. 1: *-***⁸ A-Z⁸ Aa-Zz⁸ Aaa-KKK⁸ (Rr3 signed Ss3); v. 2: a-z⁸ aa-zz⁸ aaa-lll⁸; v. 3: A-Z⁸ Aa-Zz⁸ Aaa-Yyy⁸ (Xx3 signed Xxx3)
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Signatures: *⁸, A-Z⁸, AA-ZZ⁸, AAA-ZZZ⁸, AAAA-LLLL⁸, MMMM¹⁰.
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Armorial book-plate of Barba-villa.
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Imprint from colophon; printer's mark of Mathe [Matthäus] Harnisch precedes colophon.
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Errata: leaf [401].
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Signatures: Engraved title-page, unsigned, A-Z⁸, Aa-Zz⁸, Aaa-Bbb⁸ (last leaf and verso of Bbb₇ blank)
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Bound in old calf, rebacked.
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Based on the three-dimensional elastic inclusion model proposed by Dobrovolskii, we developed a rheological inclusion model to study earthquake preparation processes. By using the Corresponding Principle in the theory of rheologic mechanics, we derived the analytic expressions of viscoelastic displacement U(r, t) , V(r, t) and W(r, t), normal strains epsilon(xx) (r, t), epsilon(yy) (r, t) and epsilon(zz) (r, t) and the bulk strain theta (r, t) at an arbitrary point (x, y, z) in three directions of X axis, Y axis and Z axis produced by a three-dimensional inclusion in the semi-infinite rheologic medium defined by the standard linear rheologic model. Subsequent to the spatial-temporal variation of bulk strain being computed on the ground produced by such a spherical rheologic inclusion, interesting results are obtained, suggesting that the bulk strain produced by a hard inclusion change with time according to three stages (alpha, beta, gamma) with different characteristics, similar to that of geodetic deformation observations, but different with the results of a soft inclusion. These theoretical results can be used to explain the characteristics of spatial-temporal evolution, patterns, quadrant-distribution of earthquake precursors, the changeability, spontaneity and complexity of short-term and imminent-term precursors. It offers a theoretical base to build physical models for earthquake precursors and to predict the earthquakes.
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In the present work the neutron emission spectra from a graphite cube, and from natural uranium, lithium fluoride, graphite, lead and steel slabs bombarded with 14.1 MeV neutrons were measured to test nuclear data and calculational methods for D - T fusion reactor neutronics. The neutron spectra measured were performed by an organic scintillator using a pulse shape discrimination technique based on a charge comparison method to reject the gamma rays counts. A computer programme was used to analyse the experimental data by the differentiation unfolding method. The 14.1 MeV neutron source was obtained from T(d,n)4He reaction by the bombardment of T - Ti target with a deuteron beam of energy 130 KeV. The total neutron yield was monitored by the associated particle method using a silicon surface barrier detector. The numerical calculations were performed using the one-dimensional discrete-ordinate neutron transport code ANISN with the ZZ-FEWG 1/ 31-1F cross section library. A computer programme based on Gaussian smoothing function was used to smooth the calculated data and to match the experimental data. There was general agreement between measured and calculated spectra for the range of materials studied. The ANISN calculations carried out with P3 - S8 calculations together with representation of the slab assemblies by a hollow sphere with no reflection at the internal boundary were adequate to model the experimental data and hence it appears that the cross section set is satisfactory and for the materials tested needs no modification in the range 14.1 MeV to 2 MeV. Also it would be possible to carry out a study on fusion reactor blankets, using cylindrical geometry and including a series of concentric cylindrical shells to represent the torus wall, possible neutron converter and breeder regions, and reflector and shielding regions.