4,532 research outputs found
Asymptotic Gap Probability Distributions of the Gaussian Unitary Ensembles and Jacobi Unitary Ensembles
In this paper, we address a class of problems in unitary ensembles.
Specifically, we study the probability that a gap symmetric about 0, i.e.
is found in the Gaussian unitary ensembles (GUE) and the Jacobi
unitary ensembles (JUE) (where in the JUE, we take the parameters
). By exploiting the even parity of the weight, a doubling of the
interval to for the GUE, and , for the (symmetric) JUE,
shows that the gap probabilities maybe determined as the product of the
smallest eigenvalue distributions of the LUE with parameter and
and the (shifted) JUE with weights and
The function, namely, the derivative of the
log of the smallest eigenvalue distributions of the finite- LUE or the JUE,
satisfies the Jimbo-Miwa-Okamoto form of and ,
although in the shift Jacobi case, with the weight
the parameter does not show up in the equation. We also obtain the
asymptotic expansions for the smallest eigenvalue distributions of the Laguerre
unitary and Jacobi unitary ensembles after appropriate double scalings, and
obtained the constants in the asymptotic expansion of the gap probablities,
expressed in term of the Barnes function valuated at special point.Comment: 38 page
Multimode optical feedback dynamics in InAs/GaAs quantum dot lasers emitting exclusively on ground or excited states: transition from short- to long-delay regimes
© 2018 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved.The optical feedback dynamics of two multimode InAs/GaAs quantum dot lasers emitting exclusively on sole ground or excited lasing states is investigated. The transition from long- to short-delay regimes is analyzed, while the boundaries associated to the birth of periodic and chaotic oscillations are unveiled to be a function of the external cavity length. The results show that depending on the initial lasing state, different routes to chaos are observed. These results are of importance for the development of isolator-free transmitters in short-reach networks
American Twitter Users Revealed Social Determinants-related Oral Health Disparities amid the COVID-19 Pandemic
Objectives: To assess self-reported population oral health conditions amid
COVID-19 pandemic using user reports on Twitter. Method and Material: We
collected oral health-related tweets during the COVID-19 pandemic from 9,104
Twitter users across 26 states (with sufficient samples) in the United States
between November 12, 2020 and June 14, 2021. We inferred user demographics by
leveraging the visual information from the user profile images. Other
characteristics including income, population density, poverty rate, health
insurance coverage rate, community water fluoridation rate, and relative change
in the number of daily confirmed COVID-19 cases were acquired or inferred based
on retrieved information from user profiles. We performed logistic regression
to examine whether discussions vary across user characteristics. Results:
Overall, 26.70% of the Twitter users discuss wisdom tooth pain/jaw hurt, 23.86%
tweet about dental service/cavity, 18.97% discuss chipped tooth/tooth break,
16.23% talk about dental pain, and the rest are about tooth decay/gum bleeding.
Women and younger adults (19-29) are more likely to talk about oral health
problems. Health insurance coverage rate is the most significant predictor in
logistic regression for topic prediction. Conclusion: Tweets inform social
disparities in oral health during the pandemic. For instance, people from
counties at a higher risk of COVID-19 talk more about tooth decay/gum bleeding
and chipped tooth/tooth break. Older adults, who are vulnerable to COVID-19,
are more likely to discuss dental pain. Topics of interest vary across user
characteristics. Through the lens of social media, our findings may provide
insights for oral health practitioners and policy makers.Comment: Accepted for publication in Quintessence Internationa
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