2,273 research outputs found
Playing “Sherlock Holmes”: Enhancing students’ understanding of prejudice and stereotyping
A very simple, innovative classroom exercise designed to heighten students\u27 understanding of stereotyping and prejudice is described. Students\u27 evaluation of the exercise was very positive. Students reported greater awareness and understanding of their own and others’ stereotypes and prejudice and of the negative effects of prejudice, with females more than males reporting enhanced awareness of others’ stereotyping. Students also rated the exercise as very enjoyable. There was a trend among Non-White more than White students to report that the exercise helped show them how to reduce stereotypes and more Non-White than White students offered solutions for reducing prejudice that involved actively reaching out and interacting with others different from themselves. Additional suggestions for instructors are discussed
Brownian Dynamics of a Sphere Between Parallel Walls
We describe direct imaging measurements of a colloidal sphere's diffusion
between two parallel surfaces. The dynamics of this deceptively simple
hydrodynamically coupled system have proved difficult to analyze. Comparison
with approximate formulations of a confined sphere's hydrodynamic mobility
reveals good agreement with both a leading-order superposition approximation as
well as a more general all-images stokeslet analysis.Comment: 4 pages, 3 figures, REVTeX with PostScript figure
Measured current drainage through holes in various dielectrics up to 2 kilovolts in a dilute plasma
The electron current drained from a plasma through approximately 0.05 cm diameter holes in eight possible space applicable dielectrics placed on a probe biased at voltages up to 2000 V dc have been determined both theoretically and experimentally. The dielectrics tested were Parylene C and N, Teflon FEP type C, Teflon TFE, Nomex, quartz 7940 Corning Glass, Mylar A, and Kapton H polymide film. A Laplace field was used to predict an upper limit for the drainage current. The measured current was less than the computed current for quartz, Teflon FEP, and the 0.0123 cm thick sample of Parylene N for all voltages tested. The drainage current through the other dielectrics became equal to or greater than the computed current at a voltage below 2000 V. The magnitudes of the currents were between 0.1 and 10 microamperes for most of the dielectrics
Configurational temperatures and interactions in charge-stabilized colloid
We demonstrate that the configurational temperature formalism can be derived
from the classical hypervirial theorem, and introduce a hierarchy of
hyperconfigurational temperature definitions, which are particularly well
suited for experimental studies. We then use these analytical tools to probe
the electrostatic interactions in monolayers of charge-stabilized colloidal
spheres confined by parallel glass surfaces. The configurational and
hyperconfigurational temperatures, together with a novel thermodynamic sum
rule, provide previously lacking self-consistency tests for interaction
measurements based on digital video microscopy, and thereby cast new light on
controversial reports of confinement-induced like-charge attractions. We
further introduce a new method for measuring the pair potential directly that
uses consistency of the configurational and hyperconfigurational temperatures
as a set of constraints for a model-free search.Comment: 15 pages, 12 figures, submitted to J. Chem. Phy
Current drainage to a high voltage probe in a dilute plasma
Electron drainage current from dilute plasma through holes in high voltage dielectric probe
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