3,361 research outputs found
One mandarin benefits the whole clan: hometown favoritism in an authoritarian regime
We study patronage politics in authoritarian Vietnam, using an exhaustive panel of 603 ranking officials from 2000 to 2010 to estimate their promotionsβ impact on infrastructure in their hometowns of patrilineal ancestry. Native officialsβ promotions lead to a broad range of hometown infrastructure improvement. Hometown favoritism is pervasive across all ranks, even among officials without budget authority, except among elected legislators. Favors are narrowly targeted towards small communes that have no political power, and are strengthened with bad local governance and strong local family values. The evidence suggests a likely motive of social preferences for hometown
A model of an optical biosensor detecting environment
Heller et. Al. (Science 311, 508 (2006)) demonstrated the first DNA-CN
optical sensor by wrapping a piece of double-stranded DNA around the surface of
single-walled carbon nanotubes (CN). This new type of optical device can be
placed inside living cells and detect trace amounts of harmful contaminants by
means of near infrared light. Using a simple exciton theory in nanostructures
and the phenomena of B-Z structural phase transition of DNA, we investigate the
working principle of this new class of optical biosensor from DNA by using the
nanostructure surface as a sensor to detect the property change of DNA as it
responds to the presence of target ions. We also propose some new design models
by replacing carbon nanotubes with graphene ribbon semiconductors.Comment: 4 pages, 4 figures, Accepte
Structure of multicorrelation sequences with integer part polynomial iterates along primes
Let be a measure preserving -action on the probability
space
vector polynomials, and . For any
and multicorrelation sequences of the form
we show that there exists a nilsequence
for which and This result simultaneously generalizes previous
results of Frantzikinakis [2] and the authors [11,13].Comment: 7 page
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