55,968 research outputs found
The law's interface with expanding technology
The role of the law in technology assessment is described in generalized terms of a legal system as it confronts expanding technology. The functions of a technology assessment are considered to be twofold; provide for legislative action designed to channel technological advance along lines which are regarded as optimal from the standpoint of society's interests; and encourage and promote legislative action which will deal decisively with the potential disruptions and injuries caused by technology at a much earlier stage of the growth of the technology than is feasible under the present legal system. It is concluded that since new law always has a disruptive effect on expectations and commitments arrived at under old law, it is generally desirable that new legislation should make the least possible change in the law consistant with accomplishing the desired objective
Combining in-domain and out-of-domain speech data for automatic recognition of disordered speech
Topological Black Holes of Einstein-Yang-Mills dilaton Gravity
We present the topological solutions of Einstein-dilaton gravity in the
presence of a non-Abelian Yang-Mills field. In 4 dimensions, we consider the
and semisimple group as the Yang-Mills gauge group, and
introduce the black hole solutions with spherical and hyperbolic horizons,
respectively. The solution in the absence of dilaton potential is
asymptotically flat and exists only with spherical horizon. Contrary to the
non-extreme Reissner-Nordstrom black hole, which has two horizons with a
timelike and avoidable singularity, here the solution may present a black hole
with a null and unavoidable singularity with only one horizon. In the presence
of dilaton potential, the asymptotic behavior of the solutions is neither flat
nor anti-de Sitter. These solutions contain a null and avoidable singularity,
and may present a black hole with two horizons, an extreme black hole or a
naked singularity. We also calculate the mass of the solutions through the use
of a modified version of Brown and York formalism, and consider the first law
of thermodynamics.Comment: 13 pages, 3 figure
The unusual distribution of molecular gas and star formation in Arp 140
We investigate the atomic and molecular interstellar medium and star
formation of NGC 275, the late-type spiral galaxy in Arp 140, which is
interacting with NGC 274, an early-type system. The atomic gas (HI)
observations reveal a tidal tail from NGC 275 which extends many optical radii
beyond the interacting pair. The HI morphology implies a prograde encounter
between the galaxy pair approximately 1.5 x 10**8 years ago. The Halpha
emission from NGC 275 indicates clumpy irregular star-formation, clumpiness
which is mirrored by the underlying mass distribution as traced by the Ks-band
emission. The molecular gas distribution is striking in its anti-correlation
with the {HII regions. Despite the evolved nature of NGC 275's interaction and
its barred potential, neither the molecular gas nor the star formation are
centrally concentrated. We suggest that this structure results from stochastic
star formation leading to preferential consumption of the gas in certain
regions of the galaxy. In contrast to the often assumed picture of interacting
galaxies, NGC 275, which appears to be close to merger, does not display
enhanced or centrally concentrated star formation. If the eventual merger is to
lead to a significant burst of star formation it must be preceded by a
significant conversion of atomic to molecular gas as at the current rate of
star formation all the molecular gas will be exhausted by the time the merger
is complete.Comment: 13 paper, accepted my Monthly Notices of the Royal Astronomical
Societ
Engineering study for a mass memory system for advanced spacecrafts Final report, 1 Dec. 1969 - 1 Jul. 1970
Mass memory system for advanced spacecraf
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