A Discussion on the measurement and interpretation of changes of strain in the Earth - Earth tides and their place in geophysics (summary)

1973 ◽  
Vol 274 (1239) ◽  
pp. 199-202 ◽  
Keyword(s):  
Experimental Study ◽  
Solid Earth ◽  
Earth Tides ◽  
Theoretical Studies ◽  
The Earth ◽  
The Future ◽  
Gravity Variations ◽  
Analytical Procedures ◽  
Experimental And Theoretical Studies

The experimental study of tidal phenomena in the solid Earth has been pursued for a century and, in particular, the last 15 years since the I.G.Y. has seen a spectacular growth in activity. The geophysical significance of the work has remained limited however, and it is necessary to study possible reasons for these shortcomings. Work in the U.K. on tilt and gravity variations has helped to identify some of the relevant problems associated with the philosophy of instrumentation and its deployment, calibration, experimental repeatability, and analytical procedures. Here the importance of the oceanic influence is clear, whereas elsewhere it has not always been accorded sufficient attention. The future of the discipline may lie in a decline in interest in body effects and a greater concentration upon the mantle, the crust and their inhomogeneities in which experimental and theoretical studies proceed in parallel.

scholarly journals On Investigations of the Tidal Waves Mf and Mm

1979 ◽  
Vol 82 ◽  
pp. 315-316
Author(s):  
G. P. Pil'nik
Keyword(s):  
Solid Earth ◽  
Elastic Properties ◽  
Earth Tides ◽  
Love Number ◽  
Astronomical Observations ◽  
Tidal Waves ◽  
The Earth ◽  
Astronomical Time ◽  
Solid Earth Tides

The comparison of astronomical time observations with the theory of solid-Earth tides makes it possible to determine the Love number, k, which characterizes the elastic properties of the Earth. In addition, the comparison of values of k determined from different tidal waves allows us to judge the accuracy of the nutational theory in astronomical observations since both tides and the Earth's nutation are produced by the same causes.

VIBRODIAGNOSTICS OF HINGE ELEMENTS CAR SUSPENSION

2020 ◽  
Vol 71 (4) ◽  
pp. 3-10
Author(s):  
A.Yu. RODICHEV ◽  
◽  
M.D. TEBEKIN ◽  
A.V. GORIN ◽  
S.V. KOLPAKOVA ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Experimental Study ◽  
Technical Condition ◽  
Theoretical Studies ◽  
Ball Joint ◽  
Theoretical Methods ◽  
Design Scheme ◽  
Car Suspension ◽  
Analysis Of Failures ◽  
Experimental And Theoretical Studies

The article contains an analysis of failures of articulated elements of automotive equipment. The paper presents a mathematical model for changing the technical condition of the ball joint of automotive vehicles. A design scheme is proposed, assumptions and limitations for a mathematical model are determined. During the work, experimental and theoretical studies were carried out. To assess the reliability of the results obtained by theoretical methods, an experimental study was car-ried out on the developed installation using vibration methods.

scholarly journals Contribution Apportée par les Marées Terrestres Dans L'étude de la Rotation de la Terre

1968 ◽  
Vol 32 ◽  
pp. 71-76
Author(s):  
P. Melchior
Keyword(s):  
Experimental Study ◽  
Experimental Determination ◽  
Principal Axis ◽  
Liquid Core ◽  
Earth Tides ◽  
The Earth ◽  
Love Numbers ◽  
Rotation Of The Earth

Three aspects of the experimental study of earth-tides present a direct interest for the study of the rotation of the earth. These are (1) the experimental determination of the Love numbers and the dynamical effects of the liquid core on nutations of the principal axis of inertia; (2) the delay of earth-tides; and (3) the drift of horizontal pendulums.

When Silence Strikes: Derrida, Heidegger, Mallarmé

2018 ◽  
Vol 40 (2) ◽  
pp. 238-262
Author(s):  
Rodrigo Therezo
Keyword(s):  
The Earth ◽  
The Future ◽  
The Way

This paper attempts to rethink difference and divisibility as conditions of (im)possibility for love and survival in the wake of Derrida's newly discovered—and just recently published—Geschlecht III. I argue that Derrida's deconstruction of what he calls ‘the grand logic of philosophy’ allows us to think love and survival without positing unicity as a sine qua non. This hypothesis is tested in and through a deconstructive reading of Heidegger's second essay on Trakl in On the Way to Language, where Heidegger's phonocentrism and surreptitious nationalism converge in an effort to ‘save the earth’ from a ‘degenerate’ Geschlecht that cannot survive the internal diremption between Geschlechter. I show that one way of problematizing Heidegger's claim is to point to the blank spaces in the ‘E i n’ of Trakl's ‘E i n Geschlecht’, an internal fissuring in the very word Heidegger mobilizes in order to secure the future of mankind.

The Stabilizing Effect of Pre-Equilibria: A Trifluoromethyl Complex as CF2 Reservoir in Catalytic Olefin Difluorocarbenation

2020 ◽  
Author(s):  
Thomas Louis-Goff ◽  
Huu Vinh Trinh ◽  
Eileen Chen ◽  
Arnold L. Rheingold ◽  
Christian Ehm ◽  
...  
Keyword(s):  
High Selectivity ◽  
Side Reactions ◽  
Theoretical Studies ◽  
Attractive Feature ◽  
Catalyst Recovery ◽  
Wide Range ◽  
Stabilizing Effect ◽  
Experimental And Theoretical Studies

A new, efficient, catalytic difluorocarbenation of olefins to give 1,1-difluorocyclopropanes is presented. The catalyst, an organobismuth complex, uses TMSCF<sub>3</sub> as a stoichiometric difluorocarbene source. We demonstrate both the viability and robustness of this reaction over a wide range of alkenes and alkynes, including electron-poor alkenes, to generate the corresponding 1,1-difluorocyclopropanes and 1,1-difluorocyclopropenes. Ease of catalyst recovery from the reaction mixture is another attractive feature of this method. In depth experimental and theoretical studies showed that the key difluorocarbene-generating step proceeds through a bismuth non-redox synchronous mechanism generating a highly reactive free CF<sub>2</sub> in an endergonic pre-equilibrium. It is the reversibility when generating the difluorocarbene that accounts for the high selectivity, while minimizing CF<sub>2</sub>-recombination side-reactions.

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