900 research outputs found
Mineral exploration potential of ERTS-1 data
The author has identified the following significant results. Preliminary analysis of a mosaic composing eight individual ERTS frames (1:1,000,000) extending well beyond the test site has revealed a number of tectonic structural trends that are controlled by regional lineations. So far most of the regional lineations fall into three general directions: east by northeast, northwest, and north-south. From preliminary examination, it appears that the older Precambrian basement predominates in the NE-bearing structural trends, whereas the predominate NW trend is most likely associated with the Texas Structural Zone, and the north-south trend being the Utah-Arizona belt and/or part of the southern Basin and Range Province. One major lineation, made up of many parallel lineations, is noticeable just north of Lake Pleasant which extends for approximately 100 miles in a northern direction out of the target area. This feature corresponds to a Precambrian schist formation shown on the USGS geologic map of Arizona
Mineral exploration potential of ERTS-1 data
The author has identified the following significant results. ERTS-1 imagery of an area approximately 15,000 square miles in Arizona was interpreted for regional structure and tectonic units. Eight fault systems were identified by trend, of which two, northeast and northwest, are considered to be related to porphyry copper mineralization. Nine tectonic units can be identified on the imagery as distinct geological identities. The boundaries between these units can be correlated with theoretical shear directions related to the San Andreas stress system. Fourier analysis of the N 50 W fault trend indicates a fundamental spacing between Fourier energy maxima that can be related to distances between copper deposits
On the presence of nonjet "higher harmonic" components in 2D angular correlations from high energy heavy ion collisions
It is conjectured that several higher harmonic flows may result from
initial-state geometry fluctuations in \aa collisions coupled to a
radially-expanding medium. But as with "elliptic flow" measurements,
non-hydrodynamic mechanisms such as jet production may contribute to other
higher azimuth multipoles as biases. Careful distinctions should be
maintained between jet-related and nonjet (possibly hydrodynamic) contributions
to (e.g., "nonflow" and "flow"). In this study we consider several
questions: (a) To what extent do jet-like structures in two-dimensional (2D)
angular correlations contribute to azimuth multipoles inferred from various
methods? (b) If a multipole element is added to a 2D fit model is a
nonzero amplitude indicative of a corresponding flow component? and (c) Can 2D
correlations establish the necessity of nonjet contributions to some or all
higher multipoles? Model fits to 2D angular correlations are used to establish
the origins of azimuth multipoles inferred from 1D projections onto azimuth or
from nongraphical numerical methods. We find that jet-like angular
correlations, and specifically a 2D peak at the angular origin consistent with
jet production, constitute the dominant contribution to inferred higher
multipoles, and the data do not {\em require} higher multipoles in isolation
from the jet-like 2D peak. Inference of "higher harmonic flows" results from
identifying certain nominally jet-like structure as flow manifestations through
unjustified application of 1D Fourier series analysis. Although the peak
structure at the angular origin is strongly modified in more-central collisions
some properties remain compatible with relevant pQCD theory expectations for
jet production.Comment: 14 pages, 11 figure
Transverse Momentum Correlations in Relativistic Nuclear Collisions
From the correlation structure of transverse momentum in relativistic
nuclear collisions we observe for the first time temperature/velocity structure
resulting from low- partons. Our novel analysis technique does not invoke
an {\em a priori} jet hypothesis. autocorrelations derived from the scale
dependence of fluctuations reveal a complex parton dissipation process
in RHIC heavy ion collisions. We also observe structure which may result from
collective bulk-medium recoil in response to parton stopping.Comment: 10 pages, 10 figures, proceedings, MIT workshop on fluctuations and
correlations in relativistic nuclear collision
Applicability of Monte Carlo Glauber models to relativistic heavy ion collision data
The accuracy of Monte Carlo Glauber model descriptions of minimum-bias
multiplicity frequency distributions is evaluated using data from the
Relativistic Heavy Ion Collider (RHIC) within the context of a sensitive,
power-law representation introduced previously by Trainor and Prindle (TP).
Uncertainties in the Glauber model input and in the mid-rapidity multiplicity
frequency distribution data are reviewed and estimated using the TP centrality
methodology. The resulting errors in model-dependent geometrical quantities
used to characterize heavy ion collisions ({\em i.e.} impact parameter, number
of nucleon participants , number of binary interactions ,
and average number of binary collisions per incident participant nucleon )
are presented for minimum-bias Au-Au collisions at = 20, 62,
130 and 200 GeV and Cu-Cu collisions at = 62 and 200 GeV.
Considerable improvement in the accuracy of collision geometry quantities is
obtained compared to previous Monte Carlo Glauber model studies, confirming the
TP conclusions. The present analysis provides a comprehensive list of the
sources of uncertainty and the resulting errors in the above geometrical
collision quantities as functions of centrality. The capability of energy
deposition data from trigger detectors to enable further improvements in the
accuracy of collision geometry quantities is also discussed.Comment: 27 pages, 4 figures, 11 table
Neutron radiographic facility at the 3-mw Livermore pool-type reactor
A description is presented of the neutron experimental radiographic facility at the Livermore Pool-Type Reactor. This facility was installed in 1974 to assist Lawrence Livermore Laboratory research programs. Some of the testing techniques used to modify the neutron beam and the present radiographic parameters are also discussed. (auth
The equivalence of fluctuation scale dependence and autocorrelations
We define optimal per-particle fluctuation and correlation measures, relate
fluctuations and correlations through an integral equation and show how to
invert that equation to obtain precise autocorrelations from fluctuation scale
dependence. We test the precision of the inversion with Monte Carlo data and
compare autocorrelations to conditional distributions conventionally used to
study high- jet structure.Comment: 10 pages, 9 figures, proceedings, MIT workshop on correlations and
fluctuations in relativistic nuclear collision
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