4,161 research outputs found

### Physical Properties of a Set of Sandstones, III: the Effects Of Fine Grained Pore Filling Material on Compressional Wave Velocity

We have used aspect ratio modeling to explain the measured compressional
wave velocities of twenty different dry sandstone samples with varying clay
contents at a single confining pressure of 0.5 kbar. Velocities of the sandstones
range between 3.1 km/sec and 5.7 km/sec. Measured porosities are between 6%
and 33%, clay contents between 2% and 30%. Pores were described using three
simple type classifications. The pore type distributions of the samples were
quantified by point counting polished impregnated thin sections using a scanning
electron microscope. A representative aspect-ratio was assigned to each of the
three categories of pore type. Velocities were modeled using these aspect ratios
weighted by the observed distribution of the porosity types. Agreement between
theoretical and measured velocities is generally within 10%. The modeling suggests
that the effects of clays in sandstone pores is to reduce the sample porosity without
reducing the non-framework (void + clay) volume. Thus, for a given porosity, clay rich
samples contain greater non-framework volume, which in turn lowers velocity. The
model derived from the dry measurements can be used to successfully approximate
empirical relationships for saturated samples of velocity-porosity-clay content taken
from the literature.Schlumberger-Doll Research CenterSchlumberger Foundation. Post-Doctoral Fellowshi

### Local/Non-Local Complementarity in Topological Effects

In certain topological effects the accumulation of a quantum phase shift is
accompanied by a local observable effect. We show that such effects manifest a
complementarity between non-local and local attributes of the topology, which
is reminiscent but yet different from the usual wave-particle complementarity.
This complementarity is not a consequence of non-commutativity, rather it is
due to the non-canonical nature of the observables. We suggest that a
local/non-local complementarity is a general feature of topological effects
that are ``dual'' to the AB effect.Comment: 4 page

### Post deposition annealing of epitaxial Ce1-xPrxO2-δ films grown on Si(111)

In this work the structural and morphological changes of Ce1−xPrxO2−δ (x = 0.20, 0.35 and 0.75) films grown on Si(111) due to post deposition annealing are investigated by low energy electron diffraction combined with a spot profile analysis. The surface of the oxide films exhibit mosaics with large terraces separated by monoatomic steps. It is shown that the Ce/Pr ratio and post deposition annealing temperature can be used to tune the mosaic spread, terrace size and step height of the grains. The morphological changes are accompanied by a phase transition from a fluorite type lattice to a bixbyite structure. Furthermore, at high PDA temperatures a silicate formation via a polycrystalline intermediate state is observed

### Orbitally tuned timescale and astronomical forcing in the middle Eocene to early Oligocene

Deciphering the driving mechanisms of Earth system processes, including the
climate dynamics expressed as paleoceanographic events, requires a complete,
continuous, and high-resolution stratigraphy that is very accurately dated.
In this study, a robust astronomically calibrated age model was constructed
for the middle Eocene to early Oligocene interval (31–43 Ma) in
order to permit more detailed study of the exceptional climatic events that
occurred during this time, including the middle Eocene climate optimum and
the Eocene–Oligocene transition. A goal of this effort is to accurately date
the middle Eocene to early Oligocene composite section cored during the
Pacific Equatorial Age Transect (PEAT, IODP Exp. 320/321). The stratigraphic
framework for the new timescale is based on the identification of the stable
long eccentricity cycle in published and new high-resolution records
encompassing bulk and benthic stable isotope, calibrated XRF core scanning,
and magnetostratigraphic data from ODP Sites 171B-1052, 189-1172, 199-1218,
and 207-1260 as well as IODP Sites 320-U1333, and 320-U1334 spanning magnetic
polarity Chrons C12n to C20n. Subsequently orbital tuning of the records to
the La2011 orbital solution was conducted. The resulting new timescale
revises and refines the existing orbitally tuned age model and the
geomagnetic polarity timescale from 31 to 43 Ma. The newly defined
absolute age for the Eocene–Oligocene boundary validates the astronomical
tuned age of 33.89 Ma identified at the Massignano, Italy, global
stratotype section and point. The compilation of geochemical records of
climate-controlled variability in sedimentation through the middle-to-late
Eocene and early Oligocene demonstrates strong power in the eccentricity band
that is readily tuned to the latest astronomical solution. Obliquity driven
cyclicity is only apparent during 2.4 myr eccentricity cycle minima
around 35.5, 38.3, and 40.1 Ma

### Transition temperature of a dilute homogeneous imperfect Bose gas

The leading-order effect of interactions on a homogeneous Bose gas is
theoretically predicted to shift the critical temperature by an amount
\Delta\Tc = # a_{scatt} n^{1/3} T_0 from the ideal gas result T_0, where
a_{scatt} is the scattering length and n is the density. There have been
several different theoretical estimates for the numerical coefficient #. We
claim to settle the issue by measuring the numerical coefficient in a lattice
simulation of O(2) phi^4 field theory in three dimensions---an effective theory
which, as observed previously in the literature, can be systematically matched
to the dilute Bose gas problem to reproduce non-universal quantities such as
the critical temperature. We find # = 1.32 +- 0.02.Comment: 4 pages, submitted to Phys. Rev. Lett; minor changes due to
improvement of analysis in the longer companion pape

### Dependence of the BEC transition temperature on interaction strength: a perturbative analysis

We compute the critical temperature T_c of a weakly interacting uniform Bose
gas in the canonical ensemble, extending the criterion of condensation provided
by the counting statistics for the uniform ideal gas. Using ordinary
perturbation theory, we find in first order $(T_c-T_c^0)/T_c^0 = -0.93
a\rho^{1/3}$, where T_c^0 is the transition temperature of the corresponding
ideal Bose gas, a is the scattering length, and $\rho$ is the particle number
density.Comment: 14 pages (RevTeX

### Ground-state properties of trapped Bose-Fermi mixtures: role of exchange-correlation

We introduce Density Functional Theory for inhomogeneous Bose-Fermi mixtures,
derive the associated Kohn-Sham equations, and determine the
exchange-correlation energy in local density approximation. We solve
numerically the Kohn-Sham system and determine the boson and fermion density
distributions and the ground-state energy of a trapped, dilute mixture beyond
mean-field approximation. The importance of the corrections due to
exchange--correlation is discussed by comparison with current experiments; in
particular, we investigate the effect of of the repulsive potential energy
contribution due to exchange--correlation on the stability of the mixture
against collapse.Comment: 6 pages, 4 figures (final version as published in Physical Review

### Initial Reports of the Deep Sea Drilling Project, vol. 85

Covering Leg 85 of the cruises of the Drilling Vessel Glomar Challenger Los Angeles, California, to Honolulu, Hawaii March-April 1982.
Includes six chapters:
1. INTRODUCTION: BACKGROUND AND EXPLANATORY NOTES, DEEP SEA DRILLING PROJECT LEG 85, CENTRAL EQUATORIAL PACIFIC
2. SITE 571
3. SITE 572
4. SITE 573
5. SITE 574
6. SITE 57

### Bose-Einstein Condensation Temperature of Homogenous Weakly Interacting Bose Gas in Variational Perturbation Theory Through Six Loops

We compute the shift of the transition temperature for a homogenous weakly
interacting Bose gas in leading order in the scattering length a for given
particle density n. Using variational perturbation theory through six loops in
a classical three-dimensional scalar field theory, we obtain Delta T_c/T_c =
1.25+/-0.13 a n^(1/3), in agreement with recent Monte-Carlo results.Comment: 4 pages; omega' corrected: final result changes slightly to
1.25+/-0.13; references added; several minor change

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