4,244 research outputs found
Black cloud over Danville: The negro movement in Danville, Virginia in 1963
It ls the purpose of this work to show how the racial disturbance began and why it came to a close in Danville, Virginia in 1963. This work asks: Why Danville, what happened, what killed it, and what was the aftermath? The central vehicle for answering these questions is the Danville Police Department. Research was done, over a period of some fifteen months, through a series of court records and transcripts, interviews, newspapers, observations, books, and other sources related to this topic. It should be pointed out, that in as many cases as possible, this author attempted to determine the validity of sources by checking them against police reports and court transcripts concerning related dates
Life History, Diet, Abundance and Distribution, and Length-Frequencies of Selected Invertebrates in Florida Bay, Everglades National Park, Florida
This report presents information on the life history, diet, abundance and distribution, and length-frequency distributions of five invertebrates in Florida Bay, Everglades National Park. Collections were made with an otter trawl in basins on a bi-monthly basis. Non-parametric
statistics were used to test spatial and temporal differences in the abundance of invertebrates when numbers were appropriate (i. e., $25). Invertebrate species are presented in four sections. The sections on Life History, and Diet were derived from the literature. The section on
Abundance and Distribution consists of data from otter-trawl collections. In addition, comparisons with other studies are included here following our results. The section on Length-frequency Distributions consists of length measurements from all collections, except 1984-1985
when no measurements were taken. Length-frequency distributions were used, when possible, to estimate life stage captured, spawning times, recruitment into Florida Bay for those species which spawn outside the Bay, and growth. Additional material from the literature was added
when appropriate. (PDF contains 39 pages
From hadrons to quarks in neutron stars: a review
We review the equation of state of matter in neutron stars from the solid
crust through the liquid nuclear matter interior to the quark regime at higher
densities. We focus in detail on the question of how quark matter appears in
neutron stars, and how it affects the equation of state. After discussing the
crust and liquid nuclear matter in the core we briefly review aspects of
microscopic quark physics relevant to neutron stars, and quark models of dense
matter based on the Nambu--Jona-Lasinio framework, in which gluonic processes
are replaced by effective quark interactions. We turn then to describing
equations of state useful for interpretation of both electromagnetic and
gravitational observations, reviewing the emerging picture of hadron-quark
continuity in which hadronic matter turns relatively smoothly, with at most
only a weak first order transition, into quark matter with increasing density.
We review construction of unified equations of state that interpolate between
the reasonably well understood nuclear matter regime at low densities and the
quark matter regime at higher densities. The utility of such interpolations is
driven by the present inability to calculate the dense matter equation of state
in QCD from first principles. As we review, the parameters of effective quark
models -- which have direct relevance to the more general structure of the QCD
phase diagram of dense and hot matter -- are constrained by neutron star mass
and radii measurements, in particular favoring large repulsive density-density
and attractive diquark pairing interactions. We describe the structure of
neutron stars constructed from the unified equations of states with crossover.
Lastly we present the current equations of state -- called "QHC18" for
quark-hadron crossover -- in a parametrized form practical for neutron star
modeling.Comment: v2, 42 pages, 36 figures, 3 tables; to be published in Reports on
Progress in Physics; new sections for cooling, X-ray analyses, and
gravitational waves are added; the results for tidal deformability are
included; equations of state and the numerical tables are updated; v3, typos
corrected in eq.
Observations on the Stone Crab, Menippe mercenaria Say, In the Vicinity of Port Aransas, Texas
Observations on the stone crab, Menippe mercenaria Say, were started on December 16, 1947. The purpose of these observations was to study the natural history and behavior of this crab, with special reference to its importance as an oyster predator. Plans called for some simple laboratory experimentation and monthly field observations. Although the regularity of the observations was interrupted for various reasons, some information gained which may interest workers is herewith presented
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