5,502 research outputs found
ERTS-1 image contributes to understanding of geologic structures related to Managua earthquake, 1972
ERTS-1 imaged the western portion of Nicaragua on December 24, 1972, one day after the central part of the city of Managua was devastated by a major earthquake which measured 5.6 on the Richter scale. ERTS-1 images reveal sets of lineaments (which may reflect fault systems) along any one of which movement could have taken place. One set includes a line of active volcanoes that parallels the coast and constitutes the southwestern edge of the Nicaraguan Depression, a regional graben which cuts obliquely across the Central American isthmus. This trend is offset approximately 10km in a right lateral geometric sense just west of the city of Managua. A parallel lineament, north of Lake Managua, marks the northeast edge of the graben. A second set, extends northward to northwestward from the mouth of the Rio Grande (Viejo) north of Lake Managua and can be projected southward across the lake to Managua. It is this set along which geometric offset of the volcanic lineament appears to have taken place
Spurious Eccentricities of Distorted Binary Components
I discuss the effect of physical distortion on the velocities of close binary
components and how we may use the resulting distortion of velocity curves to
constrain some properties of binary systems, such as inclination and mass
ratio. Precise new velocities for 5 Cet convincingly detect these distortions
with their theoretically predicted phase dependence. We can even use such
distortions of velocity curves to test Lucy's theory of convective gravity
darkening. The observed distortions for TT Hya and 5 Cet require the contact
components of those systems to be gravity darkened, probably somewhat more than
predicted by Lucy's theory but clearly not as much as expected for a radiative
star. These results imply there is no credible evidence for eccentric orbits in
binaries with contact components. I also present some speculative analyses of
the observed properties of a binary encased in a non-rotating common envelope,
if such an object could actually exist, and discuss how the limb darkening of
some recently calculated model atmospheres for giant stars may bias my resuts
for velocity-curve distortions, as well as other results from a wide range of
analyses of binary stars.Comment: 14 pp, 2 tables, 12 fig; under review by Ap
CASE Weight Test: A hands on approach to comparing and selecting CASE tools at Twentieth Century Services
Citation: Eaton, R. & Hayes, K. (1991). CASE Weight Test: A hands on approach to comparing and selecting CASE tools at Twentieth Century Services. CASE Trends: The Magazine for Computer-Aided Software Engineering, 3(8), 18-19R.G. Eaton and Karl W. Hayes are spearheading the implementation oflnformation Engineering (IE) at Twentieth Century Services, Inc. in Kansas City, MO. Twentieth Century had already decided on the need for automating an IE approach, so their task was straight forward: form a research group with the goal of comparing CASE vendOrs and recommending one toolset
Sugar beets in Iowa, 1892
Co-operative work with farmers in the study of sugar beet culture was continued during the season of 1892.
This work was begun the year previous, in which year the station distributed seed to a large number of farmers, and in autumn analyzed 502 samples of beets, grown in 51 counties of the state. (See Bulletins 15 and 17.)
Last spring (1892) the interest manifested by the farmers was much less. Only fifty-two applied for seed, and in autumn only eighteen of these sent in beets for analysis. Of the remaining thirty-four only three sent any explanation— which was in all three cases “a total failure of the crop.” No doubt the failure of most or all of the others to send in beets was due to a like cause; for not only was the season generally unfavorable, because of the unusually wet and backward spring, but moreover the writer is convinced from his own trials with the seed that much of that which he sent out was deficient in germinating power. This statement is due to those who faithfully tried and failed to get a crop; and on the other hand it is but fair to the writer to state that he procured the seed for that of “the very best quality” from a company which imports and distributes large quantities each year
EFFECTS OF CARBON MONOXIDE ON DPG CONCENTRATIONS IN THE ERYTHROCYTE
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/72782/1/j.1749-6632.1970.tb49791.x.pd
The Rotation Period of the Planet-Hosting Star HD 189733
We present synoptic optical photometry of HD 189733, the chromospherically
active parent star of one of the most intensively studied exoplanets. We have
significantly extended the timespan of our previously reported observations and
refined the estimate of the stellar rotation period by more than an order of
magnitude: days. We derive a lower limit on the
inclination of the stellar rotation axis of 56\arcdeg (with 95% confidence),
corroborating earlier evidence that the stellar spin axis and planetary orbital
axis are well aligned.Comment: To appear in A
Numerical simulations of mixed states quantum computation
We describe quantum-octave package of functions useful for simulations of
quantum algorithms and protocols. Presented package allows to perform
simulations with mixed states. We present numerical implementation of important
quantum mechanical operations - partial trace and partial transpose. Those
operations are used as building blocks of algorithms for analysis of
entanglement and quantum error correction codes. Simulation of Shor's algorithm
is presented as an example of package capabilities.Comment: 6 pages, 4 figures, presented at Foundations of Quantum Information,
16th-19th April 2004, Camerino, Ital
A One-Dimensional Volcanic Plume Model for Predicting Ash Aggregation
During explosive volcanic eruptions, volcanic ash is ejected into the atmosphere, impacting aircraft safety and downwind communities. These volcanic clouds tend to be dominated by fine ash (ÎĽm in diameter), permitting transport over hundreds to thousands of kilometers. However, field observations show that much of this fine ash aggregates into clusters or pellets with faster settling velocities than individual particles. Models of ash transport and deposition require an understanding of aggregation processes, which depend on factors like moisture content and local particle collision rates. In this study, we develop a Plume Model for Aggregate Prediction, a one-dimensional (1D) volcanic plume model that predicts the plume rise height, concentration of water phases, and size distribution of resulting ash aggregates from a set of eruption source parameters. The plume model uses a control volume approach to solve mass, momentum, and energy equations along the direction of the plume axis. The aggregation equation is solved using a fixed pivot technique and incorporates a sticking efficiency model developed from analog laboratory experiments of particle aggregation within a novel turbulence tower. When applied to the 2009 eruption of Redoubt Volcano, Alaska, the 1D model predicts that the majority of the plume is over-saturated with water, leading to a high rate of aggregation. Although the mean grain size of the computed Redoubt aggregates is larger than the measured deposits, with a peak at 1 mm rather than 500 ÎĽm, the present results provide a quantitative estimate for the magnitude of aggregation in an eruption
Archaeological Testing for a Proposed Landfill Expansion (Phase II) City of Del Rio, Val Verde County, Texas
During September 1989, a pedestrian survey was conducted within a I~S-acre tract acquired by the City of Del Rio, Val Verde County, for a landfill expansion project. The surface reconnaissance recorded one prehistoric site, 41 VV 1251. As a result, recommendation was made for Phase II subsurface testing.
The Phase II subsurface testing, which included a geomorphic study, was accomplished during February 1990. Cultural resources were recovered indicating presence at site 41 VV 1251 from the Late Paleo-Indian period to the Late Archaic period. However, the site was determined to be almost totally deflated. The geomorphological tests verified this assessment and indicated no deeply buried deposits. Site 41 VV 1251 is not deemed potentially eligible for nomination to the National Register of Historic Places or for designation as a State Archeological Landmark
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