4,161 research outputs found
Investigation of current degradation phenom- enon in superconducting solenoids second quarterly progress report, 15 oct. 1964 - 15 jan. 1965
Critical current density, upper resistive critical field, normal state resistivity, and room temperature resistivity, measurements of titanium-niobium wire sample
Tellers of Dark Fairy Tales: Common Themes in the Works of C.S. Lewis and Terence Fisher
This article explores connections between C.S. Lewis and filmmaker Terence Fisher, notably how their works explore themes like the charm of evil, white magic’s dubious nature, and myth hinting at divine truths. By viewing these themes, Fisher and Lewis’s common views on fairy tales, and how feedback informed their work, scholars discover nuance in the perceived “Inklings versus secular British culture” dichotomy
The Behavior of Legume Bacteria in Acid and Alkaline Media
Several investigators have noted a very marked difference in the resistance of various legumes to soil acidity. Vast areas of cultivated land in the United States show an acid reaction, and as lime is expensive in some localities it has been suggested that much can be saved by the choice of acid tolerant crops. Red clover, crimson clover, soy bean, cowpea, hairy vetch, lupine and serradella have been reported as acid tolerant, while on the other hand, alfalfa, one of our most useful forage crops, is found to be very sensitive to acid
\u3ci\u3eIs Superman Circumcised? The Complete Jewish History of the World’s Greatest Hero\u3c/i\u3e by Roy Schwartz
In Is Superman Circumcised?, Russell Schwartz provides a historical overview of Jerry Siegel and Joe Shuster\u27s creation of the comic book character Superman, arguing that Siegel and Shuster\u27s backgrounds in Jewish immigrants gives a particularly Jewish subtext to their character. Schwartz builds on this argument with a larger historical overview of American comic book publishing, showing how Judaism and Jewish-American immigrant experiences have informed that industry from its earliest days
High-contrast imaging of Sirius~A with VLT/SPHERE: Looking for giant planets down to one astronomical unit
Sirius has always attracted a lot of scientific interest, especially after
the discovery of a companion white dwarf at the end of the 19th century. Very
early on, the existence of a potential third body was put forward to explain
some of the observed properties of the system. We present new coronagraphic
observations obtained with VLT/SPHERE that explore, for the very first time,
the innermost regions of the system down to 0.2" (0.5 AU) from Sirius A. Our
observations cover the near-infrared from 0.95 to 2.3 m and they offer the
best on-sky contrast ever reached at these angular separations. After detailing
the steps of our SPHERE/IRDIFS data analysis, we present a robust method to
derive detection limits for multi-spectral data from high-contrast imagers and
spectrographs. In terms of raw performance, we report contrasts of 14.3 mag at
0.2", ~16.3 mag in the 0.4-1.0" range and down to 19 mag at 3.7". In physical
units, our observations are sensitive to giant planets down to 11 at
0.5 AU, 6-7 in the 1-2 AU range and ~4 at 10 AU. Despite
the exceptional sensitivity of our observations, we do not report the detection
of additional companions around Sirius A. Using a Monte Carlo orbital analysis,
we show that we can reject, with about 50% probability, the existence of an 8
planet orbiting at 1 AU. In addition to the results presented in the
paper, we provide our SPHERE/IFS data reduction pipeline at
http://people.lam.fr/vigan.arthur/ under the MIT license.Comment: 16 pages, 10 figures, accepted for publication in MNRA
Planets in Spin-Orbit Misalignment and the Search for Stellar Companions
The discovery of giant planets orbiting close to their host stars was one of
the most unexpected results of early exoplanetary science. Astronomers have
since found that a significant fraction of these 'Hot Jupiters' move on orbits
substantially misaligned with the rotation axis of their host star. We recently
reported the measurement of the spin-orbit misalignment for WASP-79b by using
data from the 3.9 m Anglo-Australian Telescope. Contemporary models of
planetary formation produce planets on nearly coplanar orbits with respect to
their host star's equator. We discuss the mechanisms which could drive planets
into spin-orbit misalignment. The most commonly proposed being the Kozai
mechanism, which requires the presence of a distant, massive companion to the
star-planet system. We therefore describe a volume-limited direct-imaging
survey of Hot Jupiter systems with measured spin-orbit angles, to search for
the presence of stellar companions and test the Kozai hypothesis.Comment: Accepted for publication in the peer-reviewed proceedings of the 13th
annual Australian Space Science Conferenc
Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution
Aims - We report new Very Large Array polarimetric observations of Compact
Steep-Spectrum (CSS) sources at 8.4, 15, and 23GHz. Methods - Using
multi-frequency VLA observations we have derived sub-arcsecond resolution
images of the total intensity, polarisation, and rotation measure (RM)
distributions. Results heading - We present multi-frequency VLA polarisation
observations of CSS sources. About half of the sources are point-like even at
the resolution of about 0.1x0.1 arcseconds. The remaining sources have double
or triple structure. Low values for the percentage of polarised emission in CSS
sources is confirmed. On the average, quasars are more polarised than galaxies.
A wide range of RM values have been measured. There are clear indications of
very large RMs up to 5\,585 rad m**(-2). CSS galaxies are characterized by RM
values that are larger than CSS quasars. The majority of the objects show very
large values of RM. Conclusions - The available data on sub-arcsecond-scale
rest-frame RM estimates for CSS sources show that these have a wide range of
values extending up to about 36,000 rad m**(-2). RM estimates indicate an
overall density of the magneto-ionic medium larger than classical radio
sources.Comment: Accepted for publication by Astronomy & Astrophysic
Investigation of current degradation phenomenon in superconducting solenoids first quarterly progress report, jul. 15 - oct. 15, 1964
Current degradation in superconducting solenoids in external magnetic fiel
J. P. Rushtons theory of ethnic nepotism
pre-printUnreciprocated aid among co-ethnics and the emotional intensity of ethnic conflict have long been explanatory challenges to evolutionary science. J. P. Rushton's theory of assortative ethnic affiliation-altruism, mating and friendship directed towards fellow ethnics-derives from his more general theory of genetic similarity (GST). GST proposes that humans give preferential treatment to others in whom they detect genetic resemblance and that such behaviour enhances genetic fitness. The theory coincides with W. D. Hamilton's theory of inclusive fitness as applied to relations between populations. GST helps explain core features of ethnicity, including its basis in putative kinship and correlation with gene frequencies. Ethnic nepotism due to similarity is a weak social force compared to social identity. However its pervasiveness makes it a potential driver of evolutionary and social change, a potential borne out by sociological studies of the impact of ethnic diversity on social cohesion and public altruism. Genomics confirms the theory for interactions within populations with sufficient genetic diversity, such as ethnically mixed societies. GST applied to ethnicity is promising for further research in evolutionary social science because it unifies evolutionary and behavioral mechanisms in a single theory
Hydrogen thermal conductivity at temperatures from 2000 to 4000 deg F Final report
Hydrogen thermal conductivity at temperatures from 2000 to 4600 deg
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