213 research outputs found
Geotechnical characterization of trench- and slope sediments off Southern Chile: preliminary results
To understand seismogenesis in shallow
parts of subduction zones, it is vital
to know about strength and frictional
parameters of subducted sediment.
For this purpose, PETROTEC,
as part of the TIPTEQ-Project, gathers
geotechnical data for sediments deposited
on the incoming Nazca Plate,
the trench and the slope off the southern
Chilean coast during the last 5 Ma, and
whose equivalents are now being underthrusted
into the seismogenic zone beneath
South America.
Material comes from gravity cores collected
during R/V SONNE Cruises
SO181 (Flüh E. & Grevemeyer I (Editors)
2005), SO102 (Hebbeln D, Wefer
G, et al. 1995) and SO156 (Hebbeln D,
et al. 2001), as well as from ODP Leg
141 (Behrmann JH, et al. 1992) drill
cores.
Sediment strength and frictional properties
are determined by triaxial testing,
ring shear testing and direct shear testing...conferenc
On the accuracy of GAIA radial velocities
We have obtained 782 real spectra and used them as inputs for 6700 automatic
cross-correlation runs to the aim of investigating the radial velocity accuracy
that GAIA could potentially achieve as function of spectral resolution and
signal-to-noise ratio. We have explored the dispersions 0.25, 0.5, 1 and 2
Ang/pix (bracketing the 0.75 Ang/pix currently baselined for the 8490--8740 Ang
GAIA range centered on the near-infrared CaII triplet) over S/N ranging from 10
to 110. We have carefully maintained the condition FWHM (PSF) = 2 pixels during
the acquisition of the 782 input spectra, and therefore the resolutions that we
have explored are 0.5, 1, 2 and 4 Ang corresponding to resolving powers
R=17200, 8600, 4300 and 2150. We have investigated late-F to early-M stars
(constituting the vast majority of GAIA targets), slowly rotating (V_{rot} sin
i = 4 km/sec, as for field stars at these spectral types), of solar metallicity
( = -0.07) and not binary. The results are accurately described by the
simple law: lg sigma = 0.6(lg S/N)^2 - 2.4(lg S/N) + 1.75(lg D) + 3, where
sigma is the cross-correlation standard error (in km/sec) and D is the spectral
dispersion (in Ang/pix). The spectral dispersion has turned out to be the
dominant factor governing the accuracy of radial velocities, with S/N being
less important and the spectral mis-match being a weak player. These results
are relevant not only within the GAIA context but also to ground-based
observers because the absence of telluric absorptions and proximity to the
wavelengths of peak emission make the explored 8490--8740 Ang interval an
interesting option for studies of cool stars with conventional telescopes.Comment: 12 pages, 2 figures, 5 tables, in press in Baltic Astronom
Front Matter Volume 5, 2011
Front matter includes program background, Table of Contents, and a complete listing of 2010 Portland State McNair Scholars
Property and Law Are Born and Must Die Together \u27: The Honorable Dale R. Cathell\u27s Philosophy of Individual Property Rights and the Government in the Court of Appeals and the Court of Special Appeals, 1989-2007
Property and Law Are Born and Must Die Together \u27: The Honorable Dale R. Cathell\u27s Philosophy of Individual Property Rights and the Government in the Court of Appeals and the Court of Special Appeals, 1989-2007
Fostering Self-Regulated Learning Through School Newspaper
School newspapers have a long educational tradition. However, the scientific literature on this activity is relatively scarce. The objective of this research is to check if there is a positive relationship between selfregulation and participation in school newspaper projects. Three groups of students will be studied who come to the same school, the IIS Einaudi of Rome (Italy). The first group will produce a web newspaper. The second a traditional newspaper. The third will be a control group. The adopted methodology will be mixed: qualitative and quantitative. The design of the qualitative analysis will be based on a case study through open interviews to students and teachers and through the direct observation of writing meetings. For the quantitative analysis the design will be quasi-experimental and it will be used a version of the Motivated Strategies for Learning Questionnaire (MLSQ) validated for Italian high school students. Regarding the results, it is expected that the group of the web newspaper will be the one that best manages to self-regulate their learning
Field, Adelbert Sinclair (1873 - )
This biographical summary was created by the Works Progress Administration (WPA) between 1936 and 1939
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