Grade Span Configuration and Academic Performance for Students in Poverty: A Texas Multiyear Analysis

Grade-span configuration refers to the range of grades within a school (Coladarci & Hancock, 2002). The debate over the benefits of one grade span configuration over the other has ensued for decades (Howley, 2002). Specific questions in this debate are (a) Which grade span configuration is most cost effective?; (b) Which grade span configuration yields the best academic achievement?; and (c) Which grade span configuration best meets the social and emotional needs of middle level children? (Howley, 2002)

Whistle and I\u27ll Wait For You

https://digitalcommons.library.umaine.edu/mmb-vp/5431/thumbnail.jp

The U.S. Gun-Control Paradox: Gun Buyer Response To Congressional Gun-Control Initiatives

Many scholars and interest groups in the U.S. advocate for more gun-control in terms of restrictions on sales.  Following the Sandy Hook shooting in Newtown, Connecticut in December 2012, The Obama Administration initiated legislation to restrict gun sales.  Coincidentally, U.S. firearm sales surged to record levels and ammunition shortages occurred.  This article examines the gun control issue in the U.S. in light of the events of 2013, demonstrating the paradox which gun-control advocates face.  The authors provide background information on the gun-control debate including the social cost of gun-violence and the U.S. political battle over the issue

Method of producing buried porous silicon-geramanium layers in monocrystalline silicon lattices

Lattices of alternating layers of monocrystalline silicon and porous silicon-germanium have been produced. These single crystal lattices have been fabricated by epitaxial growth of Si and Si--Ge layers followed by patterning into mesa structures. The mesa structures are stain etched resulting in porosification of the Si--Ge layers with a minor amount of porosification of the monocrystalline Si layers. Thicker Si--Ge layers produced in a similar manner emitted visible light at room temperature

Extrasolar Planets in the Classroom

The field of extrasolar planets is still, in comparison with other astrophysical topics, in its infancy. There have been about 300 or so extrasolar planets detected and their detection has been accomplished by various different techniques. Here we present a simple laboratory experiment to show how planets are detected using the transit technique. Following the simple analysis procedure describe we are able to determine the planetary radius to be 1.27 +/- 0.20 R_{J} which, within errors agrees with the establish value of 1.32 +/- 0.25 R_{J}.Comment: 7 pages, 2 figures, published in Physics Educatio

Buried Porous Silicon-Germanium Layers in Monocrystalline Silicon Lattices

Monocrystalline semiconductor lattices with a buried porous semiconductor layer having different chemical composition is discussed and monocrystalline semiconductor superlattices with a buried porous semiconductor layers having different chemical composition than that of its monocrystalline semiconductor superlattice are discussed. Lattices of alternating layers of monocrystalline silicon and porous silicon-germanium have been produced. These single crystal lattices have been fabricated by epitaxial growth of Si and Si-Ge layers followed by patterning into mesa structures. The mesa structures are strain etched resulting in porosification of the Si-Ge layers with a minor amount of porosification of the monocrystalline Si layers. Thicker Si-Ge layers produced in a similar manner emitted visible light at room temperature