18,881 research outputs found
Separator development for a heat sterilizable battery
Coating procedure for tape separator of heat sterilizable batter
Separator development for a heat sterilizable battery Quarterly report, 1 Jan. - 31 Mar. 1968
Dip coating method for manufacturing sterilizable battery tape separator
Separator development for a heat sterilizable battery Quarterly report, 1 Apr. - 30 Jun. 1968
Flame absorption spectroscopic analysis of support tape
Separator development for a heat sterilizable battery Quarterly report, Oct. 1 - Dec. 31, 1967
Zirconium oxide loadings and coating methods varied to improve separators for heat sterilizable batter
One-Loop Self-Dual and N=4 Super Yang-Mills
We conjecture a simple relationship between the one-loop maximally helicity
violating gluon amplitudes of ordinary QCD (all helicities identical) and those
of N=4 supersymmetric Yang-Mills (all but two helicities identical). Because
the amplitudes in self-dual Yang Mills have been shown to be the same as the
maximally helicity violating ones in QCD, this conjecture implies that they are
also related to the maximally helicity violating ones of N=4 supersymmetric
Yang-Mills. We have an explicit proof of the relation up to the six-point
amplitude; for amplitudes with more external legs, it remains a conjecture. A
similar conjecture relates amplitudes in self-dual gravity to maximally
helicity violating N=8 supergravity amplitudes.Comment: 14 pages, TeX, three figures, two new references adde
Radiative Hydrodynamic Simulations of HD209458b: Temporal Variability
We present a new approach for simulating the atmospheric dynamics of the
close-in giant planet HD209458b that allows for the decoupling of radiative and
thermal energies, direct stellar heating of the interior, and the solution of
the full 3D Navier Stokes equations. Simulations reveal two distinct
temperature inversions (increasing temperature with decreasing pressure) at the
sub-stellar point due to the combined effects of opacity and dynamical flow
structure and exhibit instabilities leading to changing velocities and
temperatures on the nightside for a range of viscosities. Imposed on the
quasi-static background, temperature variations of up to 15% are seen near the
terminators and the location of the coldest spot is seen to vary by more than
20 degrees, occasionally appearing west of the anti-solar point. Our new
approach introduces four major improvements to our previous methods including
simultaneously solving both the thermal energy and radiative equations in both
the optical and infrared, incorporating updated opacities, including a more
accurate treatment of stellar energy deposition that incorporates the opacity
relevant for higher energy stellar photons, and the addition of explicit
turbulent viscosity.Comment: Accepted for publication in Ap
A hydrous melting and fractionation model for mid-ocean ridge basalts: Application to the Mid-Atlantic Ridge near the Azores
The major element, trace element, and isotopic composition of mid-ocean ridge basalt glasses affected by the Azores hotspot are strongly correlated with H2O content of the glass. Distinguishing the relative importance of source chemistry and potential temperature in ridge-hotspot interaction therefore requires a comprehensive model that accounts for the effect of H2O in the source on melting behavior and for the effect of H2O in primitive liquids on the fractionation path. We develop such a model by coupling the latest version of the MELTS algorithm to a model for partitioning of water among silicate melts and nominally anhydrous minerals. We find that much of the variation in all major oxides except TiO2 and a significant fraction of the crustal thickness anomaly at the Azores platform are explained by the combined effects on melting and fractionation of up to ~700 ppm H2O in the source with only a small thermal anomaly, particularly if there is a small component of buoyantly driven active flow associated with the more H2O-rich melting regimes. An on-axis thermal anomaly of ~35Β°C in potential temperature explains the full crustal thickness increase of ~4 km approaching the Azores platform, whereas a β₯75Β°C thermal anomaly would be required in the absence of water or active flow. The polybaric hydrous melting and fractionation model allows us to solve for the TiO2, trace element and isotopic composition of the H2O-rich component in a way that self-consistently accounts for the changes in the melting and fractionation regimes resulting from enrichment, although the presence and concentration in the enriched component of elements more compatible than Dy cannot be resolved
Atmospheric Dynamics of Short-period Extra Solar Gas Giant Planets I: Dependence of Night-Side Temperature on Opacity
More than two dozen short-period Jupiter-mass gas giant planets have been
discovered around nearby solar-type stars in recent years, several of which
undergo transits, making them ideal for the detection and characterization of
their atmospheres. Here we adopt a three-dimensional radiative hydrodynamical
numerical scheme to simulate atmospheric circulation on close-in gas giant
planets. In contrast to the conventional GCM and shallow water algorithms, this
method does not assume quasi hydrostatic equilibrium and it approximates
radiation transfer from optically thin to thick regions with flux-limited
diffusion. In the first paper of this series, we consider
synchronously-spinning gas giants. We show that a full three-dimensional
treatment, coupled with rotationally modified flows and an accurate treatment
of radiation, yields a clear temperature transition at the terminator. Based on
a series of numerical simulations with varying opacities, we show that the
night-side temperature is a strong indicator of the opacity of the planetary
atmosphere. Planetary atmospheres that maintain large, interstellar opacities
will exhibit large day-night temperature differences, while planets with
reduced atmospheric opacities due to extensive grain growth and sedimentation
will exhibit much more uniform temperatures throughout their photosphere's. In
addition to numerical results, we present a four-zone analytic approximation to
explain this dependence.Comment: 35 Pages, 13 Figure
Negative differential resistance due to single-electron switching
We present the multilevel fabrication and measurement of a Coulomb-blockade
device displaying tunable negative differential resistance (NDR). Applications
for devices displaying NDR include amplification, logic, and memory circuits.
Our device consists of two Al/AlO islands that are strongly coupled
by an overlap capacitor. Our measurements agree excellently with a model based
on the orthodox theory of single-electron transport.Comment: 3 pages, 3 figures; submitted to AP
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