60,344 research outputs found
A Gate Forever Closed? Retiring Immigration Law’s Post-departure Bar
Immigration law’s “post-departure bar” destroys the jurisdiction of either an immigration judge or the Board of Immigration Appeals to hear a motion to reopen or reconsider filed by an alien who is no longer physically within the country. This Note examines the current conflict between the federal circuits regarding the post-departure bar and why the circuits that have decided to strike down the bar in the cases before them have ruled in line with certain trends present in recent Supreme Court immigration cases.
Conflict between the circuits has arisen because the governing statute, the Illegal Immigration Reform and Immigrant Responsibility Act of 1996, was enacted without reference to the bar, which had been in place before the Act’s passage. In that statutory silence, the Attorney General promulgated regulations intended to reestablish the bar. In recent years, circuits have taken various positions on the bar’s validity. Many have struck the bar down on the basis of either Chevron deference or the grounds outlined in Union Pacific Railroad Co. v. Brotherhood of Locomotive Engineers, which bars an agency from limiting its jurisdiction in certain situations. Still, other circuits have upheld the bar by using Chevron to conclude that deference to the agency is proper.
This Note suggests that the circuits that have struck down the bar are in line with prevailing trends in recent immigration cases decided by the Supreme Court. Further, this Note argues that it does not matter whether a circuit court relies upon Chevron or Union Pacific to strike down the bar, as the use of either precedent to attack the bar serves these trends, and is consistent with the overall direction of American immigration law
Fixture aids soldering of electronic components on circuit board
Spring clamp fixture holds small electronic components in a desired position while they are being soldered on a circuit board. The spring clamp is clipped on the edge of the circuit board and an adjustable spring-steel boom holds components against the board. The felt pad at the end of the boom is replaced with different attachments for other holding tasks
Similarities between organic and cuprate superconductors
This ``Perspective'' briefly reviews recent work showing that a class of
organic superconductors have important similarities to the cuprate
superconductors: (i) There is competition betweeen superconductivity and
antiferromagnetism. (ii) Uncoventional metallic behavior is observed near the
metal-insulator transition. A more detailed review and discussion of the
appropriate strongly correlated electron model can be found in
cond-mat/9802198.Comment: 2 pages, RevTeX + epsf, 1 figure
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Crocodylus acutus
Number of Pages: 17Integrative BiologyGeological Science
Book Review: Microscopic anatomy of invertebrates
Book Review:
Microscopic anatomy of invertebrates, VoL 11, A, B, C, Insecta. Harrison, Frederick W. (editor), and Michael Locke. New York: Wiley-Liss, voL 11A, xxii+381 [+index 1-74], voL 11B, xxii+385-840 [+index 1-74 (repeated)], voL 3, xxii+843-1296 [incL 74 page index]. Cloth: $675.00. [ISBN 0-471-15955-7 (set).
A two-state model of twisted intramolecular chargetransfer in monomethine dyes
A two-state model Hamiltonian is proposed to model the coupling of twisting
displacements to charge-transfer behavior in the ground and excited states of a
general monomethine dye molecule. This coupling may be relevant to the
molecular mechanism of environment-dependent fluorescence yield enhancement.
The model is parameterized against quantum chemical calculations on different
protonation states of the green fluorescent protein chromophore (GFP), which
are chosen to sample different regimes of detuning from the cyanine (resonant)
limit. The model provides a simple yet realistic description of the charge
transfer character along two possible excited state twisting channels
associated with the methine bridge. It describes qualitatively different
behavior in three regions that can be classified by their relationship to the
resonant (cyanine) limit. The regimes differ by the presence or absence of
twist-dependent polarization reversal and the occurrence of conical
intersections. We find that selective biasing of one twisting channel over
another by an applied diabatic biasing potential can only be achieved in a
finite range of parameters near the cyanine limit.Comment: 45 pages, 9 Figures (incl. 2 chemical schemes). Accepted for
publication by the Journal of Chemical Physics. Changes include 2 additional
figures to and expanded discussion of key points felt to be important, and
condensed discussion of some points felt to be less importan
Enhancement of the thermal expansion of organic charge transfer salts by strong electronic correlations
Organic charge transfer salts exhibit thermal expansion anomalies similar to
those found in other strongly correlated electron systems. The thermal
expansion can be anisotropic and have a non-monotonic temperature dependence.
We show how these anomalies can arise from electronic effects and be
significantly enhanced, particularly at temperatures below 100 K, by strong
electronic correlations. For the relevant Hubbard model the thermal expansion
is related to the dependence of the entropy on the parameters (, , and
) in the Hamiltonian or the temperature dependence of bond orders and double
occupancy. The latter are calculated on finite lattices with the Finite
Temperature Lanczos Method. Although many features seen in experimental data,
in both the metallic and Mott insulating phase, are described qualitatively,
the calculated magnitude of the thermal expansion is smaller than that observed
experimentally.Comment: 9 pages, 6 figure
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