Results 51 to 60 of about 120,010 (213)
Spectacle and Spy Stories: The 1954 Royal Commission on Espionage
Australian Journal of Politics &History, EarlyView.ABSTRACT The Menzies government's 1954 royal commission, established to investigate Soviet espionage in Australia, is well known as the backdrop to the Labor Party split. It saw opposition leader H.V. Evatt's demise and ushered in an almost 20‐year period of Liberal Party governance.
Ebony Nilsson
wiley +1 more source
Are mantle plumes adiabatic? [PDF]
Earth and Planetary Science Letters, 2001 Abstract The issue concerning the state of adiabaticity of mantle plumes has been examined in a cartesian two-dimensional box with an aspect-ratio of six. We have investigated in the quasi steady-state regime high Rayleigh number convection with both depth-dependent viscosity and thermal expansivity for both the Boussinesq and the extended Boussinesq
Ctirad Matyska, David A. Yuen
openaire +1 more source
Dispersal, source and glass chemistry of a third tephra unit within Iceland's Settlement Layer
Boreas, EarlyView.Tephra layers may be studied to understand the dynamics and sequence of past explosive volcanism. In Iceland, the distinctive Settlement Layer (AD ~877) underlies almost all archaeological evidence for the Norse Settlement and is preserved in soils across Iceland and as cryptotephra overseas.
Conner A. G. Morison +3 more
wiley +1 more source
A seismological study of the mantle beneath Iceland [PDF]
, 2000 Iceland has long been thought to be underlain by a thermal upwelling, or plume, rising from deep within the mantle. This study tests this hypothesis, by a) seeking evidence for a plume in the lower mantle in azimuth anomalies at the NORSAR array and b ...
Pritchard, Matthew James +1 more
core
Upwellings and Mantle Ponding Zones in the Lower Mantle Transition Zone (660–1000 km)
GeosciencesConvective instabilities at various boundary layers in the earth’s mantle—including the core–mantle boundary, mantle transition zone and lithosphere-asthenosphere boundary— result in upwellings (mantle plumes) and downwellings (subducting slabs).
Jean-Paul Montagner +3 more
doaj +1 more source
Геофизический журнал, 2021 The paper presents additional data, approaching to understanding the driving forces in the formation of geological structures and the development of the Indian platform.
L.N. Zaiets +2 more
doaj +1 more source
Difference and the Liberation of Sufficient Reason
European Journal of Philosophy, EarlyView.Abstract The Principle of Sufficient Reason (PSR) holds that every event and entity can be explained by a sufficient reason or cause. Philosophers have long struggled with the question of the PSR's compatibility with freedom, for if what occurs or exists follows necessarily from its sufficient reason then it seems it could not have been otherwise ...
Louis Matheou
wiley +1 more source
The energetics of melting fertile heterogeneities within the depleted mantle [PDF]
To explore the consequences of mantle heterogeneity for primary melt production, we develop a mathematical model of energy conservation for an upwelling, melting body of recycled oceanic crust embedded in the depleted upper mantle.
Katz, R. F., Rudge, John F.
core +1 more source
Large volcanic eruptions are mostly sourced above mobile basal mantle structures
Communications Earth & EnvironmentMost deep mantle plumes rise from hot basal mantle structures, creating large volcanic eruptions at Earth’s surface. In previous studies, mantle plumes were the implicit process connecting volcanic eruptions to hot basal mantle structures.
Annalise Cucchiaro +3 more
doaj +1 more source
Research progress of mantle plume
地震科学进展, 2021 Since the mantle plume hypothesis was proposed，it has been controversial in academia，and there is no unified answer to its existence. In this paper，the origin of the mantle plume is elaborated in detail.
Hang Du +4 more
doaj +1 more source