6,321 research outputs found
Imaging the Moon II: Webcam CCD observations & analysis (a two week lab for non-majors)
Presented is a successful two week lab involving real sky observations of the
Moon in which students make telescopic observations and analyze their own
images. Originally developed around the 35 mm film camera as a common household
object adapted for astronomical work, the lab transitioned to use the webcam as
film photography evolved into an obscure specialty technology and increasing
numbers of students had little familiarity with it. The printed circuit board
with the CCD is harvested from a retail webcam and affixed to a tube to mount
on a telescope in place of an eyepiece. Image frames are compiled to form a
lunar mosaic and crater sizes are measured. Students also work through the
logistical steps of telescope time assignment and scheduling, keeping to
schedule and working with uncertainties of weather, in ways paralleling
research observations. Because there is no need for a campus observatory, this
lab can be replicated at a wide variety of institutions.Comment: 4 pages, 2 figures, COSMOS in the Classroom 2013 (conference
proceedings), astronomy educatio
Observation of Microscopic Deformation Behavior of Cork
Cork is a material that has many characteristics, for instance, light weight, elasticity, insulation against heat, impermeability for liquid, and so forth. There are two types of cork, the natural and the agglomerated corks. In the present paper, compression tests of the natural and the agglomerated cork specimens were carried out. The compression test were done in various directions. Compressive stress was measured by a original compression apparatus, and stress-strain curves were obtained in various directions of the cork specimens. In the natural cork, there are differences between the radial and the non-radial direction. The recovery of dimensions after compression was also studied in respective directions. The structure of the deformed surface was observed by a scanning electron microscope
Mean-Field Calculation Based on Proton-Neutron Mixed Energy Density Functionals
We have performed calculations based on the Skyrme energy density functional
(EDF) that includes arbitrary mixing between protons and neutrons. In this
framework, single-particle states are generalized as mixtures of proton and
neutron components. The model assumes that the Skyrme EDF is invariant under
the rotation in isospin space and the Coulomb force is the only source of the
isospin symmetry breaking. To control the isospin of the system, we employ the
isocranking method, which is analogous to the standard cranking approach used
for describing high-spin states. Here, we present results of the isocranking
calculations performed for the isobaric analog states in and
nuclei.Comment: 6 pages, 7 figures, talk given at the 2nd Conference on "Advances in
Radioactive Isotope Science 2014" (ARIS 2014), Tokyo, Japan, Jun. 1-6, 201
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