4,010 research outputs found
Problem of Site Definition in Cultural Resource Management
The strategies employed by the Cache River Archeological Project, the Little Black Watershed Project, and the 1976 Village Creek Archeological Project with regard to site definition are compared and assessed. It is argued that both the Cache and Little Black Projects used unnecessarily restrictive definitions of cultural resources. The more liberal approach of the Village Creek Project enables both the archeological community and governmental agencies to interpret and assess better the significance and general extent of the archeological context of the cultural resource base
Mississippian Communities in the St. Francis Basin: A Central Place Model
The development of Mississippian settlement models for northeast Arkansas is reviewed. It is argued that a five-tier central place hierarchy best accounts for the variability currently known to exist among Mississippian communities in the St. Francis basin
Expectations for the Deep Impact collision from cometary nuclei modelling
Using the cometary nucleus model developed by Espinasse et al. (1991), we
calculate the thermodynamical evolution of Comet 9P/Tempel 1 over a period of
360 years. Starting from an initially amorphous cometary nucleus which
incorporates an icy mixture of H2O and CO, we show that, at the time of Deep
Impact collision, the crater is expected to form at depths where ice is in its
crystalline form. Hence, the subsurface exposed to space should not be
primordial. We also attempt an order-of-magnitude estimate of the heating and
material ablation effects on the crater activity caused by the 370 Kg
projectile released by the DI spacecraft. We thus show that heating effects
play no role in the evolution of crater activity. We calculate that the CO
production rate from the impacted region should be about 300-400 times higher
from the crater resulting from the impact with a 35 m ablation than over the
unperturbed nucleus in the immediate post-impact period. We also show that the
H2O production rate is decreased by several orders of magnitude at the crater
base just after ablation
Upper Cretaceous Cephalopoda from offshore deposits off the Natal South coast, South Africa
Dredge samples off the Natal South Coast yielded an Upper Cretaceous cephalopod fauna consisting of Eutrephoceras sphaericum geinitzi Wiedmann, 1960, Phylloceras (Hypophylloceras) woodsi woodsi Van Hoepen, 1921, Partschiceras umzambiense (Van Hoepen, 1920), Saghalinites nuperus (Van Hoepen, 1921), Saghalinites cala (Forbes, 1846), Baculites bailyi Woods, 1906, 'Bostrychoceras' indicum (Stoliczka, 1865), Hyphantoceras (Madagascarites?) amapondense (Van Hoepen, 1921), Desmophyllites diphylloides (Forbes, 1846), Hauericeras sp. cf. H. gardeni (Baily, 1855), Kossmaticeras (Natalites) africanus (Van Hoepen, 1920), and Kossmaticeras (Kossmaticeras) sp. cf. K. (K.) inornatum Collignon, 1966. This fauna is similar to that of the onshore Mzamba Formation of Natal and Transkei (Pondoland), and is dated as Middle Santonian to Lower Campanian
Anthropology and the Academy of Science: The Need for a New Role
Few anthropology papers were presented at the Annual Meetings of the Arkansas Academy of Science before 1968. Establishment of the Arkansas Archeological Survey in 1967 brought an influx of professional anthropologists to the state and a subsequent increase in the number of anthropology papers published. However, the growth in number of active anthropologists has created a need for more information channels within the state. The time is right for the Anthropology Section of the Academy to become a formal base for interaction and information dissemination among anthropologists
Distortion of Globular Clusters by Galactic Bulges
One of the external fields that influences the population of globular
clusters is that due to galactic bulges. In extreme situations, perigalactic
distances pc, globular clusters could suffer total disruption in
a single passage. A more common scenario is that for cluster orbits with pc. We investigate the effects of tidal forces from a bulge on the
shape of globular clusters for this type of encounters. We find distortions
characterized by ``twisting isophotes'' and consider the potential for
observability of this effect. In the Milky Way, a typical globular cluster must
pass within several hundred pc of the center to experience substantial
distortion, and it is possible that this has happened recently to one or two
present day clusters. We estimate that this distortion could be observed even
for globulars in dense fields toward the bulge. In more extreme environments
such as giant ellipticals or merger products with newly formed globulars, this
effect could be more common, extending out to orbits that pass within 1 kpc of
the bulge center. This would lead to a substantial shift in the eccentricity
distribution of globulars in those galaxies.Comment: 12 pages, 8 figure
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