In situ electrical resistivity and bulk porosity of the oceanic crust Costa Rica Rift

Nature ◽  
1982 ◽  
Vol 300 (5893) ◽  
pp. 594-598 ◽  
Author(s):  
Keir Becker ◽  
R. P. Von Herzen ◽  
T. J. G. Francis ◽  
R. N. Anderson ◽  
J. Honnorez ◽  
...  
Author(s):  
W. E. King

A side-entry type, helium-temperature specimen stage that has the capability of in-situ electrical-resistivity measurements has been designed and developed for use in the AEI-EM7 1200-kV electron microscope at Argonne National Laboratory. The electrical-resistivity measurements complement the high-voltage electron microscope (HVEM) to yield a unique opportunity to investigate defect production in metals by electron irradiation over a wide range of defect concentrations.A flow cryostat that uses helium gas as a coolant is employed to attain and maintain any specified temperature between 10 and 300 K. The helium gas coolant eliminates the vibrations that arise from boiling liquid helium and the temperature instabilities due to alternating heat-transfer mechanisms in the two-phase temperature regime (4.215 K). Figure 1 shows a schematic view of the liquid/gaseous helium transfer system. A liquid-gas mixture can be used for fast cooldown. The cold tip of the transfer tube is inserted coincident with the tilt axis of the specimen stage, and the end of the coolant flow tube is positioned without contact within the heat exchanger of the copper specimen block (Fig. 2).


Measurement ◽  
2021 ◽  
pp. 109547
Author(s):  
Saeid Saberi ◽  
Martin Stockinger ◽  
Christian Stoeckl ◽  
Bruno Buchmayr ◽  
Helmut Weiss ◽  
...  

2018 ◽  
Vol 2 (4) ◽  
pp. 1-4 ◽  
Author(s):  
Marios Sophocleous ◽  
Pericles Savva ◽  
Michael F. Petrou ◽  
John K. Atkinson ◽  
Julius Georgiou

1980 ◽  
Vol 117 (6) ◽  
pp. 547-563 ◽  
Author(s):  
R. E. Swarbrick ◽  
A. H. F. Robertson

SummaryRecent resurgence of interest in the Mesozoic rocks of SW and southern Cyprus necessitates redefinition of the Mesozoic sedimentary and igneous rocks in line with modern stratigraphical convention. Two fundamentally different rocks associations are present, the Troodos Complex, not redefined, a portion of late Cretaceous oceanic crust, and the Mamonia Complex, the tectonically dismembered remnants of a Mesozoic continental margin. Based on earlier work, the Mamonia Complex is divided into two groups, each subdivided into a number of subsidiary formations and members. The Ayios Photios Group is wholly sedimentary, and records the evolution of a late Triassic to Cretaceous inactive continental margin. The Dhiarizos Group represents Triassic alkalic volcanism and sedimentation adjacent to a continental margin. Several other formations not included in the two groups comprise sedimentary mélange and metamorphic rocks. The Troodos Complex possesses an in situ late Cretaceous sedimentary cover which includes two formations of ferromanganiferous pelagic sediments, radiolarites and volcaniclastic sandstones. The overlying Cainozoic calcareous units are not redefined here.


2021 ◽  
Vol 130 (8) ◽  
pp. 085301
Author(s):  
M. Novotný ◽  
P. Fitl ◽  
S. A. Irimiciuc ◽  
J. Bulíř ◽  
J. More-Chevalier ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document