In situ measurements of the solubility of crystals under high pressure by an interferometric method

1998 ◽  
Vol 69 (7) ◽  
pp. 2720-2724 ◽  
Author(s):  
Yoshihisa Suzuki ◽  
Tsutomu Sawada ◽  
Satoru Miyashita ◽  
Hiroshi Komatsu
Keyword(s):  
High Pressure ◽  
In Situ Measurements ◽  
Interferometric Method

Identification of Marine Soils by Ballistic Penetrometry

1990 ◽  
Vol 112 (4) ◽  
pp. 277-284
Author(s):  
O. Hembise ◽  
P. Guevel ◽  
P. R. Bardey ◽  
J. L. Viaud ◽  
J. Y. Boisson ◽  
...  
Keyword(s):  
High Pressure ◽  
Shape Optimization ◽  
Data Acquisition ◽  
Pressure Sensors ◽  
Physical Characteristics ◽  
In Situ Measurements ◽  
Disposable Sensor ◽  
Course Stability

This article describes a disposable, sensor-filled ballistic penetrator for in-situ measurements during and after penetration into the clayey sediments of the seabed at depths of about 6000 m. The project involved work on several theoretical and experimental aspects of hydrodynamics: penetrator shape optimization, course stability, precision of point of impact. In addition, measurement and data acquisition techniques were developed using high-pressure sensors, and the dynamics of soil penetration and hole-closing were studied. The project led to the implementation of instrument-carrying devices weighing two tonnes, which, by penetrating some 40 m into the clay at impact speeds of the order of 55 m/s, provided valuable information on the physical characteristics of the seabed soils.

In situ measurements of the orthorhombic-to-trigonal transition inBaSi2sunder high-pressure and high-temperature conditions

1997 ◽  
Vol 55 (1) ◽  
pp. 132-135 ◽  
Author(s):  
Motoharu Imai ◽  
Toshiyuki Hirano ◽  
Takumi Kikegawa ◽  
Osamu Shimomura
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
In Situ Measurements ◽  
Temperature Conditions

A High-Pressure Device for In-Situ Measurements in a Neutron Beam

1994 ◽  
Vol 157-162 ◽  
pp. 131-136
Author(s):  
J. Heinitz ◽  
N.N. Isakov ◽  
A.N. Nikitin ◽  
W.A. Sukhoparov ◽  
K. Ullemeyer ◽  
...  
Keyword(s):  
High Pressure ◽  
Neutron Beam ◽  
In Situ Measurements

Solid Contact Ion-Selective Electrodes for in Situ Measurements at High Pressure

2017 ◽  
Vol 89 (9) ◽  
pp. 4803-4807 ◽  
Author(s):  
Andrew W. Weber ◽  
Glen D. O’Neil ◽  
Samuel P. Kounaves
Keyword(s):  
High Pressure ◽  
In Situ Measurements ◽  
Ion Selective Electrodes ◽  
Solid Contact

In situ measurements of sound velocities and densities across the orthopyroxene → high-pressure clinopyroxene transition in MgSiO3 at high pressure

2004 ◽  
Vol 147 (1) ◽  
pp. 27-44 ◽  
Author(s):  
Jennifer Kung ◽  
Baosheng Li ◽  
Takeyuki Uchida ◽  
Yanbin Wang ◽  
Daniel Neuville ◽  
...  
Keyword(s):  
High Pressure ◽  
In Situ Measurements ◽  
Sound Velocities

Single Crystal Growth of High-Pressure Phases of Ice and Salt Hydrate Far Below the Original Melting Point by Mixing Alcohol: Crystal Structure Determination of Magnesium Chloride Heptahydrate

2020 ◽  
Author(s):  
Keishiro Yamashita ◽  
Kazuki Komatsu ◽  
Hiroyuki Kagi
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Crystal Growth ◽  
Single Crystal ◽  
Room Temperature ◽  
Growth Technique ◽  
Salt Hydrate ◽  
X Ray

An crystal-growth technique for single crystal x-ray structure analysis of high-pressure forms of hydrogen-bonded crystals is proposed. We used alcohol mixture (methanol: ethanol = 4:1 in volumetric ratio), which is a widely used pressure transmitting medium, inhibiting the nucleation and growth of unwanted crystals. In this paper, two kinds of single crystals which have not been obtained using a conventional experimental technique were obtained using this technique: ice VI at 1.99 GPa and MgCl<sub>2</sub>·7H<sub>2</sub>O at 2.50 GPa at room temperature. Here we first report the crystal structure of MgCl2·7H2O. This technique simultaneously meets the requirement of hydrostaticity for high-pressure experiments and has feasibility for further in-situ measurements.

The Carbon:²³⁴Thorium ratios of sinking particles in the California Current Ecosystem 2: Examination of a thorium sorption, desorption, and particle transport model

2019 ◽  
Author(s):  
Michael Stukel ◽  
Thomas Kelly
Keyword(s):  
Organic Carbon ◽  
Water Column ◽  
Particulate Organic Carbon ◽  
Transport Model ◽  
California Current ◽  
In Situ Measurements ◽  
Power Law Distribution ◽  
Sinking Particles ◽  
Organic Carbon Concentration

Thorium-234 (234Th) is a powerful tracer of particle dynamics and the biological pump in the surface ocean; however, variability in carbon:thorium ratios of sinking particles adds substantial uncertainty to estimates of organic carbon export. We coupled a mechanistic thorium sorption and desorption model to a one-dimensional particle sinking model that uses realistic particle settling velocity spectra. The model generates estimates of 238U-234Th disequilibrium, particulate organic carbon concentration, and the C:234Th ratio of sinking particles, which are then compared to in situ measurements from quasi-Lagrangian studies conducted on six cruises in the California Current Ecosystem. Broad patterns observed in in situ measurements, including decreasing C:234Th ratios with depth and a strong correlation between sinking C:234Th and the ratio of vertically-integrated particulate organic carbon (POC) to vertically-integrated total water column 234Th, were accurately recovered by models assuming either a power law distribution of sinking speeds or a double log normal distribution of sinking speeds. Simulations suggested that the observed decrease in C:234Th with depth may be driven by preferential remineralization of carbon by particle-attached microbes. However, an alternate model structure featuring complete consumption and/or disaggregation of particles by mesozooplankton (e.g. no preferential remineralization of carbon) was also able to simulate decreasing C:234Th with depth (although the decrease was weaker), driven by 234Th adsorption onto slowly sinking particles. Model results also suggest that during bloom decays C:234Th ratios of sinking particles should be higher than expected (based on contemporaneous water column POC), because high settling velocities minimize carbon remineralization during sinking.

Sign in / Sign up

Export Citation Format

Share Document