Georgia College & State University

About: Georgia College & State University is a education organization based out in Milledgeville, Georgia, United States. It is known for research contribution in the topics: Population & Context (language use). The organization has 950 authors who have published 1591 publications receiving 37027 citations.

A Colosteid-Like Early Tetrapod from the St. Louis Limestone (Early Carboniferous, Meramecian), St. Louis, Missouri, USA

Abstract: We report the discovery of an early tetrapod skull from the St. Louis Limestone of Missouri, USA. It was found among a collection of coelacanths in the Museum fur Naturkunde in Berlin, Germany, part of a larger collection donated to that institution by Jaekel containing other fish fossils from the same locality. The exact locality remains uncertain, but sedimentological analysis suggests that the specimens derive from the lower or middle part of the Upper St. Louis Limestone. The lithology is consistent with a deeper water marine setting, suggesting that the tetrapod specimen is an erratic. The skull is a natural mold exposed in palatal view, showing good detail of the bones preserved. Phylogenetic analysis shows it to be most closely related to colosteids, though retaining some plesiomorphic characters. Stratigraphic correlation shows that the St. Louis Limestone is older than the Verdi and Waugh Members of Iowa, here assigned to the Ste. Genevieve Formation, from which other colosteid specimens...

A description and functional interpretation of the mandibular geometry of Agabus punctatus Melsheimer, 1844, Rhantus calidus (Fabricius, 1792) and Acilius mediatus (Say, 1823), (Coleoptera: Dytiscidae)

Abstract: Eleven morphometric, geometric, and/or biomechanical parameters are developed and presented as quantitative descriptors of dytiscid mandibles. These include arc, angle of attack, maximum camber, position of maximum camber, basal angle, and abductor and adductor gear ratios. This quantifiable character set distinguishes mandibles of Acilius from those of Agabus and Rhantus, a likely indication of exploitation of an open water prey regime by larvae of Acilius. Components of this prey regime are probably encountered only rarely by larvae of A. punctatus, and R. calidus. The comparison of A. punctatus, and R. calidus also revealed significant differences between mandibles of these two species with respect to proportional length, arc, angle of attack, and maximum camber. These differences suggest that the prey regimes exploited in situ by larvae of each of these two also includes different prey species.

Experimental and theoretical study of the 2H(d→,γ)4He reaction below Ec.m.=60 keV

Abstract: New measurements of the analyzing powers ${A}_{y}$ and ${T}_{20}$ have been obtained for the $^{2}\mathrm{H}(d,\ensuremath{\gamma})^{4}\mathrm{H}\mathrm{e}$ reaction at a laboratory beam energy of $115\phantom{\rule{03em}{0ex}}\mathrm{keV}$ A transition matrix element analysis results in a unique solution which indicates that the reaction proceeds by 55% $E2$, 29% $E1$, and 16% $M2$ radiation These results are shown to be in good agreement with the results of a new refined resonating group model calculation The impact of these results on the extrapolated value of the astrophysical $S$ factor for this reaction is discussed

Characterizing the pulsations of the ZZ Ceti star KUV 02464+3239

Abstract: We present the results on period search and modeling of the cool DAV star KUV 02464+3239. Our observations resolved the multiperiodic pulsational behaviour of the star. In agreement with its position near the red edge of the DAV instability strip, it shows large amplitude, long period pulsation modes, and has a strongly nonsinusoidal light curve. We determined 6 frequencies as normal modes and revealed remarkable short-term amplitude variations. A rigorous test was performed for the possible source of amplitude variation: beating of modes, effect of noise, unresolved frequencies or rotational triplets. Among the best-fit models resulting from a grid search, we selected 3 that gave l = 1 solutions for the largest amplitude modes. These models had masses of 0.645, 0.650 and 0.680M⊙. The 3 ‘favoured’ models have MH