694 research outputs found
Probing Satellite Quenching With Galaxy Clustering
Satellites within simulated massive clusters are significantly spatially
correlated with each other, even when those satellites are not gravitationally
bound to each other. This correlation is produced by satellites that entered
their hosts relatively recently, and is undetectable for satellites that have
resided in their hosts for multiple dynamical timescales. Therefore, a
measurement of clustering statistics of cluster satellites may be used to
determine the typical accretion redshifts of those satellites into their
observed hosts. We argue that such measurements may be used to determine the
fraction of satellite galaxies that were quenched by their current hosts,
thereby discriminating among models for quenching of star formation in
satellite galaxies.Comment: 7 page
The application of macro co-kriging and compound lognormal theory to long range grade forecasts for the carbon leader reef
A project report submitted to the Faculty of Engineering, University of the
Witwatersrand, in partial fulfilment of the requirements for the degree of Master
of Science in Engineering. Johannesburg, 1997.Due to the extreme costs of establishing new shaft systems in Witwatersrand gold
mines it is essential that the resource estimation is optimised, The result of poor
Of sub-optimal estimation could be catastrophic even.to the largest of mining
companies.
This project examines the application of Compound Lognormal Distribution
theory and shows the advantages of this distribution model over more traditional
models, for the Carbon Leader Reef. The incorporation of information from
mined out areas of a deposit in resource estimation is demonstrated. The critical
role played by accurate geological modelling is highlighted.
The process of Macro Co-Kriging in conjunction with Compound Lognormal
Theory is discussed in detail and is shown to be a more accurate estimation
technique than traditional techniques using Lognormal theory.
Finally the use of the Macro Co-kriged limits are shown to be useful in the
classification of Mineral Resources.AC201
Is it time for a wealth tax to offset the economic damage from COVID-19?
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Pars pro toto and personhood in Roman cremation ritual: new bioarchaeological evidence for the rite of os resectum
Os resectum, or ‘cut bone,’ is an obscure Roman funerary rite known primarily from literary sources. To date, archaeological examples have been recovered from Rome, Ostia, Herculaneum, and Pithekoussai, but none have been positively identified in the western provinces of the Roman Empire. This paper presents bioarchaeological evidence concerning an unusual pattern of preservation for the bones of a single finger in a burial from a late second to mid-third century A.D. cemetery in the Roman colony of Lincoln, England. It explores the implications of this evidence for the identification and performance of os resectum, and for understanding rites of passage surrounding Roman death. As well as revealing the value of integrating scientific and theoretical perspectives in the investigation of questions surrounding ritual behavior, it is argued that os resectum provides evidence to support the presence of a widespread concept of somatic partibility at the heart of Roman forms of personhood
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