Characterization of thermohaline staircases in the Tyrrhenian sea using stochastic heterogeneity mapping

2013 ◽  
Vol 133 (5) ◽  
pp. 3313-3313 ◽  
Author(s):  
Grant G. Buffett ◽  
Richard W. Hobbs ◽  
Ekaterina Vsemirnova ◽  
Dirk Klaeschen ◽  
Charles Hurich ◽  
...  
Keyword(s):  
Tyrrhenian Sea ◽  
Stochastic Heterogeneity

Characterization of thermohaline staircases in the Tyrrhenian Sea using stochastic heterogeneity mapping

2013 ◽  
Author(s):  
Grant G. Buffett ◽  
Richard W. Hobbs ◽  
Ekaterina A. Vsemirnova ◽  
Dirk Klaeschen ◽  
Charles A. Hurich ◽  
...  
Keyword(s):  
Tyrrhenian Sea ◽  
Stochastic Heterogeneity

scholarly journals Identification and Characterization of Nursery Areas of Red Mullet Mullus barbatus in the Central Tyrrhenian Sea

2017 ◽  
Vol 9 (1) ◽  
pp. 203-215 ◽  
Author(s):  
Alessandro Criscoli ◽  
Paolo Carpentieri ◽  
Francesco Colloca ◽  
Andrea Belluscio ◽  
Giandomenico Ardizzone
Keyword(s):  
Tyrrhenian Sea ◽  
Nursery Areas ◽  
Red Mullet ◽  
Mullus Barbatus ◽  
Identification And Characterization

Improved hydrogeophysical characterization and monitoring through parallel modeling and inversion of time-domain resistivity andinduced-polarization data

Geophysics ◽  
2010 ◽  
Vol 75 (4) ◽  
pp. WA27-WA41 ◽  
Author(s):  
Timothy C. Johnson ◽  
Roelof J. Versteeg ◽  
Andy Ward ◽  
Frederick D. Day-Lewis ◽  
André Revil
Keyword(s):  
Time Domain ◽  
Distributed Storage ◽  
Geophysical Methods ◽  
Large Data ◽  
Parallel Execution ◽  
Large Data Sets ◽  
Data Sets ◽  
Tyrrhenian Sea ◽  
Desktop Computer

Electrical geophysical methods have found wide use in the growing discipline of hydrogeophysics for characterizing the electrical properties of the subsurface and for monitoring subsurface processes in terms of the spatiotemporal changes in subsurface conductivity, chargeability, and source currents they govern. Presently, multichannel and multielectrode data collections systems can collect large data sets in relatively short periods of time. Practitioners, however, often are unable to fully utilize these large data sets and the information they contain because of standard desktop-computer processing limitations. These limitations can be addressed by utilizing the storage and processing capabilities of parallel computing environments. We have developed a parallel distributed-memory forward and inverse modeling algorithm for analyzing resistivity and time-domain induced polar-ization (IP) data. The primary components of the parallel computations include distributed computation of the pole solutions in forward mode, distributed storage and computation of the Jacobian matrix in inverse mode, and parallel execution of the inverse equation solver. We have tested the corresponding parallel code in three efforts: (1) resistivity characterization of the Hanford 300 Area Integrated Field Research Challenge site in Hanford, Washington, U.S.A., (2) resistivity characterization of a volcanic island in the southern Tyrrhenian Sea in Italy, and (3) resistivity and IP monitoring of biostimulation at a Superfund site in Brandywine, Maryland, U.S.A. Inverse analysis of each of these data sets would be limited or impossible in a standard serial computing environment, which underscores the need for parallel high-performance computing to fully utilize the potential of electrical geophysical methods in hydrogeophysical applications.

scholarly journals Electromagnetic experiments for the detection and characterization of seafloor massive sulfides: two case studies from the Mediterranean and Northern Mid-Atlantic Ridge

2020 ◽  
Author(s):  
Hölz Sebastian ◽  
Haroon Amir ◽  
Konstantin Reeck ◽  
Jegen Marion
Keyword(s):  
Sedimentary Cover ◽  
Hydrothermal Activity ◽  
Tyrrhenian Sea ◽  
Massive Sulfides ◽  
Ocean Ridges ◽  
Transient Electromagnetic ◽  
Global Demand ◽  
Mid Atlantic Ridge ◽  
The Mediterranean

<p>Seafloor massive sulfides (SMS) are regarded as a potential future resource to satisfy the growing global demand of strategic metals. Aside from mining and retrieving profitable amounts of massive sulfides from the seafloor, the present challenge is to detect and delineate significant SMS accumulations, which are generally located near mid-ocean ridges and along submarine volcanic arc and backarc spreading centers.</p><p>In the past years we have used the marine transient electromagnetic induction system MARTEMIS, a coincident-loop TEM system developed at GEOMAR (Kiel, Germany), in various marine geological settings for the detection and characterization of SMS in the shallow seafloor down to a depth of ~30m. The system was also used in combination with remote EM receivers (Coil2Dipole experiment) to allow for investigations of conductive structures, which are covered by up to ~100m of sediments.</p><p>We present experiments from two locations, one at an inactive site in the Mediterranean (Palinuro, Tyrrhenian Sea) where the occurrence of SMS had previously been confirmed by drilling, and one active site on the Northern Mid-Atlantic Ridge (Grimsey Hydrothermal Field, offshore Northern Iceland) where no SMS have been found in gravity cores up to now. The results demonstrate the suitability of the system to detect, delineate and characterize SMS even in scenarios, where the mineralizations are no longer connected to any hydrothermal activity or are buried under a sedimentary cover.</p>

Morpho-acoustic characterization of a shallow-water mud volcano offshore Scoglio d'Affrica (Northern Tyrrhenian Sea) responsible for a violent gas outburst in 2017

2020 ◽  
Vol 428 ◽  
pp. 106277
Author(s):  
Daniele Casalbore ◽  
Michela Ingrassia ◽  
Martina Pierdomenico ◽  
Stan E. Beaubien ◽  
Eleonora Martorelli ◽  
...  
Keyword(s):  
Shallow Water ◽  
Mud Volcano ◽  
Tyrrhenian Sea ◽  
Gas Outburst ◽  
Acoustic Characterization

Characterization of mucilage aggregates in Adriatic and Tyrrhenian Sea: structure similarities between mucilage samples and the insoluble fractions of marine humic substance

Chemosphere ◽  
2001 ◽  
Vol 44 (4) ◽  
pp. 709-720 ◽  
Author(s):  
Mauro Mecozzi ◽  
Rita Acquistucci ◽  
Vito Di Noto ◽  
Eva Pietrantonio ◽  
Marina Amici ◽  
...  
Keyword(s):  
Humic Substance ◽  
Tyrrhenian Sea

Morphological Characterization of Mycobacteriophage R1

1974 ◽  
Vol 32 ◽  
pp. 254-255
Author(s):  
B. L. Soloff ◽  
T. A. Rado
Keyword(s):  
Carbon Source ◽  
Stationary Phase ◽  
Growth Phase ◽  
Minimal Medium ◽  
Morphological Characterization ◽  
Logarithmic Growth Phase ◽  
Complete Lysis ◽  
Lysogenic Culture ◽  
Logarithmic Growth

Mycobacteriophage R1 was originally isolated from a lysogenic culture of M. butyricum. The virus was propagated on a leucine-requiring derivative of M. smegmatis, 607 leu−, isolated by nitrosoguanidine mutagenesis of typestrain ATCC 607. Growth was accomplished in a minimal medium containing glycerol and glucose as carbon source and enriched by the addition of 80 μg/ ml L-leucine. Bacteria in early logarithmic growth phase were infected with virus at a multiplicity of 5, and incubated with aeration for 8 hours. The partially lysed suspension was diluted 1:10 in growth medium and incubated for a further 8 hours. This permitted stationary phase cells to re-enter logarithmic growth and resulted in complete lysis of the culture.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Characterization of Coherent, Ordered Precipitates in Nickel-Base Alloys

1973 ◽  
Vol 31 ◽  
pp. 144-145
Author(s):  
B. H. Kear ◽  
J. M. Oblak
Keyword(s):  
Stable Phase ◽  
Nickel Base Superalloy ◽  
Alloy 718 ◽  
Commercial Alloy ◽  
Precipitate Morphology ◽  
Continuous Precipitation ◽  
Nickel Base ◽  
Base Superalloy ◽  
Strengthening Precipitate

A nickel-base superalloy is essentially a Ni/Cr solid solution hardened by additions of Al (Ti, Nb, etc.) to precipitate a coherent, ordered phase. In most commercial alloy systems, e.g. B-1900, IN-100 and Mar-M200, the stable precipitate is Ni3 (Al,Ti) γ′, with an LI2structure. In A lloy 901 the normal precipitate is metastable Nis Ti3 γ′ ; the stable phase is a hexagonal Do2 4 structure. In Alloy 718 the strengthening precipitate is metastable γ″, which has a body-centered tetragonal D022 structure.Precipitate MorphologyIn most systems the ordered γ′ phase forms by a continuous precipitation re-action, which gives rise to a uniform intragranular dispersion of precipitate particles. For zero γ/γ′ misfit, the γ′ precipitates assume a spheroidal.

Sign in / Sign up

Export Citation Format

Share Document