A DEEP‐SEA ELECTRICAL RESISTIVITY PROBE FOR MEASURING POROSITY AND DENSITY OF UNCONSOLIDATED SEDIMENTS

Geophysics ◽  
1969 ◽  
Vol 34 (4) ◽  
pp. 554-571 ◽  
Author(s):  
A. Kermabon ◽  
C. Gehin ◽  
P. Blavier
Keyword(s):  
Electrical Resistivity ◽  
Marine Sediments ◽  
Unconsolidated Sediments ◽  
Formation Factor ◽  
Sea Floor ◽  
Polynomial Curve ◽  
Best Fit ◽  
Porosity Measurements ◽  
Probe Measurements

A study has been made of the mass physical properties and electrical resistivity of marine sediments. The well‐known linear correlation of density with porosity was confirmed. A third‐degree polynomial curve was found to be the best fit for our data relating porosity and the formation factor, which is the ratio of the bulk resistivity of marine sediments, to the resistivity of interstitial water. An electrical resistivity probe has been devised to obtain “in‐situ” profiles of resistivity versus depth. The instrument is 13 m long and weighs 700 kg in water. About thirty rapid measurements on the sea floor can be made in one lowering. Good correlation was obtained between electrical probe measurements and direct porosity measurements made on cores taken nearby.

In situ measurement of electrical resistivity of marine sediments, results from Cascadia Basin off Vancouver Island

2005 ◽  
Vol 216 (1-2) ◽  
pp. 17-26 ◽  
Author(s):  
Daniela Jansen ◽  
Bernd Heesemann ◽  
Marion Pfender ◽  
Andreas Rosenberger ◽  
Heinrich Villinger
Keyword(s):  
Electrical Resistivity ◽  
Marine Sediments ◽  
Vancouver Island ◽  
In Situ Measurement

In-situ electrical-resistivity measurements in the high-voltage electron microscope

1978 ◽  
Vol 36 (1) ◽  
pp. 68-69
Author(s):  
W. E. King
Keyword(s):  
Electrical Resistivity ◽  
Electron Microscope ◽  
High Voltage ◽  
Resistivity Measurements ◽  
Voltage Electron ◽  
High Voltage Electron Microscope ◽  
High Voltage Electron ◽  
Wide Range ◽  
Helium Gas

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).

scholarly journals In Situ exploration of the giant planets

2021 ◽  
Author(s):  
O. Mousis ◽  
D. H. Atkinson ◽  
R. Ambrosi ◽  
S. Atreya ◽  
D. Banfield ◽  
...  
Keyword(s):  
Solar System ◽  
Giant Planets ◽  
Atmospheric Composition ◽  
Formation History ◽  
History Of ◽  
Composition Structure ◽  
Galileo Probe ◽  
Probe Measurements

AbstractRemote sensing observations suffer significant limitations when used to study the bulk atmospheric composition of the giant planets of our Solar System. This impacts our knowledge of the formation of these planets and the physics of their atmospheres. A remarkable example of the superiority of in situ probe measurements was illustrated by the exploration of Jupiter, where key measurements such as the determination of the noble gases’ abundances and the precise measurement of the helium mixing ratio were only made available through in situ measurements by the Galileo probe. Here we describe the main scientific goals to be addressed by the future in situ exploration of Saturn, Uranus, and Neptune, placing the Galileo probe exploration of Jupiter in a broader context. An atmospheric entry probe targeting the 10-bar level would yield insight into two broad themes: i) the formation history of the giant planets and that of the Solar System, and ii) the processes at play in planetary atmospheres. The probe would descend under parachute to measure composition, structure, and dynamics, with data returned to Earth using a Carrier Relay Spacecraft as a relay station. An atmospheric probe could represent a significant ESA contribution to a future NASA New Frontiers or flagship mission to be launched toward Saturn, Uranus, and/or Neptune.

scholarly journals A new development of four-point method to measure the electrical resistivity in situ during plastic deformation

Measurement ◽  
2021 ◽  
pp. 109547
Author(s):  
Saeid Saberi ◽  
Martin Stockinger ◽  
Christian Stoeckl ◽  
Bruno Buchmayr ◽  
Helmut Weiss ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Electrical Resistivity ◽  
Point Method ◽  
New Development

A Chloroflexi bacterium dechlorinates polychlorinated biphenyls in marine sediments under in situ-like biogeochemical conditions

2012 ◽  
Vol 209-210 ◽  
pp. 449-457 ◽  
Author(s):  
Giulio Zanaroli ◽  
Annalisa Balloi ◽  
Andrea Negroni ◽  
Luigimaria Borruso ◽  
Daniele Daffonchio ◽  
...  
Keyword(s):  
Polychlorinated Biphenyls ◽  
Marine Sediments

scholarly journals A Durable, Screen-Printed Sensor for In Situ and Real-Time Monitoring of Concrete's Electrical Resistivity Suitable for Smart Buildings/Cities and IoT

2018 ◽  
Vol 2 (4) ◽  
pp. 1-4 ◽  
Author(s):  
Marios Sophocleous ◽  
Pericles Savva ◽  
Michael F. Petrou ◽  
John K. Atkinson ◽  
Julius Georgiou
Keyword(s):  
Electrical Resistivity ◽  
Real Time ◽  
Real Time Monitoring ◽  
Smart Buildings ◽  
Screen Printed
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