1,813 research outputs found
Defining Petrophysical Units of the Palmer Deep Sites from Leg 178
Palmer Deep, on the inner continental shelf southwest of Anvers
Island off the Antarctic Peninsula, is a glacially overdeepened basin
consisting of three subbasins. Two sites, 1098 and 1099, were drilled in
the Palmer Deep area.
A high-resolution porosity curve has been calculated from density
data and subsequently plotted against the shipboard lithologic logs.
These new data correspond accurately to the lithologic logs, magnetic
susceptibility, and gamma ray attenuation (GRA) density data and offer
information on the heterogeneity of the sediments.
Petrophysical groups have been generated to investigate interrelationships
between different physical attributes. To develop these petrophysical
groups, crossplots of the available physical properties data
were performed. The results for the GRA density and magnetic susceptibility
crossplots demonstrate distinct clusters. Plotting the magnetic
susceptibility and GRA density data logs (divided into these new petrophysical
groups) against lithology provided information to subdivide
the lithologic unit(s) into a series of petrophysical units
Super p-branes
It is shown that the extension of the spacetime supersymmetric Green-
Schwarz covariant superstring action to p-dimensional extended objects (p-branes) is possible if and only if the on-shell p-dimensional bose and fermi
degrees of freedom are equal. This is further evidence for world-tube supersymmetry
in these models. All the p-brane models are related to superstring
actions in d = 3, 4, 6 or 10 dimensions by double dimensional reduction, (which
we generalise to reduction on arbitrary compact spaces), and we also show how
they may be considered as topological defects of supergravity theories
Preoperative Kidney Function linked to mortality and readmission outcomes at Day 90 and 30 in Older Emergency Surgical Patients
Grants were received from British Geriatric Society and The Renal Association to support Louis EvansPeer reviewedPublisher PD
P86 Does early preoperative osteoarthritis affect the outcome after autologous chondrocyte implantation?
Mass-Transport Models with Multiple-Chipping Processes
We study mass-transport models with multiple-chipping processes. The rates of
these processes are dependent on the chip size and mass of the fragmenting
site. In this context, we consider k-chip moves (where k = 1, 2, 3, ....); and
combinations of 1-chip, 2-chip and 3-chip moves. The corresponding mean-field
(MF) equations are solved to obtain the steady-state probability distributions,
P (m) vs. m. We also undertake Monte Carlo (MC) simulations of these models.
The MC results are in excellent agreement with the corresponding MF results,
demonstrating that MF theory is exact for these models.Comment: 18 pages, 4 figures, To appear in European Physical Journal
Multi-layered Ruthenium-modified Bond Coats for Thermal Barrier Coatings
Diffusional approaches for fabrication of multi-layered Ru-modified bond coats for thermal
barrier coatings have been developed via low activity chemical vapor deposition and high activity
pack aluminization. Both processes yield bond coats comprising two distinct B2 layers, based on
NiAl and RuAl, however, the position of these layers relative to the bond coat surface is reversed
when switching processes. The structural evolution of each coating at various stages of the
fabrication process has been and subsequent cyclic oxidation is presented, and the relevant
interdiffusion and phase equilibria issues in are discussed. Evaluation of the oxidation behavior of
these Ru-modified bond coat structures reveals that each B2 interlayer arrangement leads to the
formation of α-Al 2 O 3 TGO at 1100°C, but the durability of the TGO is somewhat different and in
need of further improvement in both cases
Generation of defects and disorder from deeply quenching a liquid to form a solid
We show how deeply quenching a liquid to temperatures where it is linearly
unstable and the crystal is the equilibrium phase often produces crystalline
structures with defects and disorder. As the solid phase advances into the
liquid phase, the modulations in the density distribution created behind the
advancing solidification front do not necessarily have a wavelength that is the
same as the equilibrium crystal lattice spacing. This is because in a deep
enough quench the front propagation is governed by linear processes, but the
crystal lattice spacing is determined by nonlinear terms. The wavelength
mismatch can result in significant disorder behind the front that may or may
not persist in the latter stage dynamics. We support these observations by
presenting results from dynamical density functional theory calculations for
simple one- and two-component two-dimensional systems of soft core particles.Comment: 25 pages, 11 figure
Benzyne in V4334 Sqr: A Quest for the Ring with SOFIA/EXES
Large aromatic molecules are ubiquitous in both circumstellar and interstellar environments. Detection of small aromatic molecules, such as benzene (C6H6) and benzyne (C6H4), are rare in astrophysical environments. Detection of such species will have major implications for our understanding of the astrochemistry involved in the formation of the molecules necessary for life, including modeling the chemical pathways to the formation of larger hydrocarbon molecules. We conducted a search for the infrared 18 ÎŒm spectral signature of benzyne in V4334 Sgr with the Stratospheric Observatory for Infrared Astronomy (SOFIA)/Echelon-Cross-Echelle Spectrograph (EXES) finding no evidence for a feature at the sensitivity of our observations
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