18,366 research outputs found
The Eclipsing Scuti Star EPIC 245932119
We present the physical properties of EPIC 245932119 ( = 9.82)
exhibiting both eclipses and pulsations from the {\it K{\rm 2}} photometry. The
binary modeling indicates that the eclipsing system is in detached or
semi-detached configurations with a mass ratio of 0.283 or 0.245, respectively,
and that its light-curve parameters are almost unaffected by pulsations.
Multiple frequency analyses were performed for the light residuals in the
outside-primary eclipsing phase after subtracting the binarity effects from the
observed data. We detected 35 frequencies with signal to noise amplitude ratios
larger than 4.0 in two regions of 0.626.28 day and 19.3624.07
day. Among these, it is possible that some high signals close to the
Nyquist limit may be reflections of real pulsation frequencies
(2). All frequencies (, , , ,
, ) in the lower frequency region are orbital harmonics, and
three high frequencies (, , ) appear to be sidelobes
split from the main frequency of = 22.77503 day. Most of them are
thought to be alias effects caused by the orbital frequency. For the 26 other
frequencies, the pulsation periods and pulsation constants are in the ranges of
0.0410.052 days and 0.0130.016 days, respectively. These values and the
position in the Hertzsprung-Russell diagram reveal that the primary component
is a Sct pulsator. The observational properties of EPIC 245932119 are
in good agreement with those for eclipsing binaries with Sct-type
pulsating components.Comment: 17 pages, including 5 figures and 3 tables, accepted for publication
in A
Dynamics of clustered opinions in complex networks
A simple model for simulating tug of war game as varying the player number in
a team is discussed to identify the slow pace of fast change. This model shows
that a large number of information sources leads slow change for the system.
Also, we introduce an opinion diffusion model including the effect of a high
degree of clustering. This model shows that the de facto standard and lock-in
effect, well-known phenomena in economics and business management, can be
explained by the network clusters.Comment: 11 pages, 2 figure
A Retrospective Lateral Cephalometric Growth Study of Sagittal Airway Changes
Purpose: This study retrospectively examined the average sagittal dimensions in the pharyngeal airway from skeletal and dental Class I males and females from 7 to 16 years of age utilizing longitudinal data from the American Association of Orthodontists Foundation Craniofacial Growth Legacy Collection. The study evaluated whether average sagittal airway dimensions differed between males and females at each age, and whether the sagittal airway dimension changed with increasing age. Materials and Methods: Sagittal airway dimension based on identifiable anatomical landmarks were digitally traced and measured from the longitudinal lateral cephalograms of 30 females and 32 males from the AAOF Growth Legacy Collection from ages 7 to 16. The distance from the anterior to posterior 2-D limit of the airway along a line perpendicular to Frankfort Horizontal and passing through the anterior nasal spine (ANS) (Measurement 1A-1B), through A-point (Measurement 2A-2B), through upper incisor tip (Measurement 3A-3B), through B-point (Measurement 4A-4B), and throughPogonion (Pog) (Measurement 5A-5B) was measured. Results: ANCOVA showed that males had a statistically significant greater 3A-3B length than females at age 13 (P = 0.02), 15 (P = 0.01), and 16 (P = 0.04). In males, there was a statistically significant increase in 2A-2B length (P = 0.04) and 5A-5B length (P = 0.03) between ages 7 and 16. No other comparisons were statistically significant. Conclusions: No statistically significant difference was found in sagittal airway dimension between males and females. No statistically significant difference was found in change in sagittal airway dimension with increasing age. We were unable to establish normative values
Factors Affecting the Probability of Default: Student Loans in California
Much of the recent research on the causes of student loan default has focused on the characteristics of borrowers and the schools they attended. Little attention has been given to post-college experiences as a determinant of default. By linking a large database of California student borrowers with background financial and demographic information and post-college employment data, this study examines factors that predict default for borrowers in the Federal Family Education Loan program, including post-college variables. Background demographic and financial characteristics, leaving school without a degree, having low wages after leaving school, or experiencing unemployment were major determinants of default. Also, controlling for these socioeconomic variables, the analysis revealed that vocational schools, especially privately held ones, are more likely to have students who default on their loans
Comments on "The Role of the Central Asian Mountains on the Midwinter Suppression of North Pacific Storminess" - Reply
We thank Chang and Lin for their thoughtful and
constructive comments on our study (Park et al. 2010).
In Park et al. (2010), we did not explicitly state that the
topography-forced stationary waves are the direct cause
for the reduced downstream transient eddy kinetic energy
(EKE). The response of stationary waves to topography
may saturate even with a relatively small mountain (Cook
and Held 1992); furthermore, their magnitudes are much
smaller than thermally forced stationary waves (Chang
2009; Held et al. 2002). Instead, we suggest that quasistationary waves generated by the central Asian mountains may strongly affect North Pacific storminess by
changing the year-to-year variability of westerly winds
over the eastern Eurasian continent. Observational analyses
indicate that the midwinter suppression of North
Pacific storminess does not occur every year. Some years
experience stronger and more meridionally confined
zonal winds over the western North Pacific, leading to
stronger midwinter suppression (Harnik and Chang
2004; Nakamura and Sampe 2002)
Modeling of composite beams and plates for static and dynamic analysis
A rigorous theory and corresponding computational algorithms was developed for a variety of problems regarding the analysis of composite beams and plates. The modeling approach is intended to be applicable to both static and dynamic analysis of generally anisotropic, nonhomogeneous beams and plates. Development of a theory for analysis of the local deformation of plates was the major focus. Some work was performed on global deformation of beams. Because of the strong parallel between beams and plates, the two were treated together as thin bodies, especially in cases where it will clarify the meaning of certain terminology and the motivation behind certain mathematical operations
Quantification of Macroscopic Quantum Superpositions within Phase Space
Based on phase-space structures of quantum states, we propose a novel measure
to quantify macroscopic quantum superpositions. Our measure simultaneously
quantifies two different kinds of essential information for a given quantum
state in a harmonious manner: the degree of quantum coherence and the effective
size of the physical system that involves the superposition. It enjoys
remarkably good analytical and algebraic properties. It turns out to be the
most general and inclusive measure ever proposed that it can be applied to any
types of multipartite states and mixed states represented in phase space.Comment: 4 pages, 1 figure, accepted for publication in Phys. Rev. Let
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