417 research outputs found
HII Regions, Embedded Protostars, and Starless Cores in Sharpless 2-157
We present arcsecond resolution 1.4mm observations of the high mass star
forming region, Sharpless 2-157, that reveal the cool dust associated with the
first stages of star formation. These data are compared with archival images at
optical, infrared, and radio wavelengths, and complemented with new arcsecond
resolution mid-infrared data. We identify a dusty young HII region, numerous
infrared sources within the cluster envelope, and four starless condensations.
Three of the cores lie in a line to the south of the cluster peak, but the most
massive one is right at the center and associated with a jumble of bright radio
and infrared sources. This presents an interesting juxtaposition of high and
low mass star formation within the same cluster which we compare with similar
observations of other high mass star forming regions and discuss in the context
of cluster formation theory.Comment: accepted to ApJ; 6 pages, 3 figure
Chaotic saddles in nonlinear modulational interactions in a plasma
A nonlinear model of modulational processes in the subsonic regime involving
a linearly unstable wave and two linearly damped waves with different damping
rates in a plasma is studied numerically. We compute the maximum Lyapunov
exponent as a function of the damping rates in a two-parameter space, and
identify shrimp-shaped self-similar structures in the parameter space. By
varying the damping rate of the low-frequency wave, we construct bifurcation
diagrams and focus on a saddle-node bifurcation and an interior crisis
associated with a periodic window. We detect chaotic saddles and their stable
and unstable manifolds, and demonstrate how the connection between two chaotic
saddles via coupling unstable periodic orbits can result in a crisis-induced
intermittency. The relevance of this work for the understanding of modulational
processes observed in plasmas and fluids is discussed.Comment: Physics of Plasmas, in pres
A model of CP Violation from Extra Dimension
We construct a realistic model of CP violation in which CP is broken in the
process of dimensional reduction and orbifold compactification from a five
dimensional theories with gauge symmetry. CP
violation is a result of the Hosotani type gauge configuration in the higher
dimension.Comment: 5 page
Signal Separation and Tracking Algorithm for Multi-Person Vital Signs by Using Doppler Radar
Noninvasive monitoring is an important Internet-of-Things application, which is made possible with the advances in radio-frequency based detection technologies. Existing techniques however rely on the use of antenna array and/or frequency modulated continuous wave radar to detect vital signs of multiple adjacent objects. Antenna size and limited bandwidth greatly limit the applicability. In this paper, we propose our system termed ‘DeepMining’ which is a single-antenna, narrowband Doppler radar system that can simultaneously track the respiration and heartbeat rates of multiple persons with high accuracy. DeepMining uses a number of signal observations over a period of time as input and returns the trajectory of the respiration and heartbeat rates of each person. The extraction is based on frequency separation algorithms using successive signal cancellation. The proposed system is implemented using the self-injection locking radar architecture and tested in a series of experiments, showing accuracies of 90% and 85% for two and three objects, respectively, even for closely located persons
Intercollegiate Women\u27s Choral Festival
KSU School of Music presents Intercollegiate Women\u27s Choral Festival.https://digitalcommons.kennesaw.edu/musicprograms/1097/thumbnail.jp
Kinematically Blocked Curvaton
In this paper, we investigate the idea that the decay of a curvaton is
kinematically blocked and show that the coupling constant for curvaton decay
can be as large as . We also find in this case the lower bound of
the Hubble parameter at horizon exit from big bang nucleosynthesis (BBN) is
H_\ast \gae 7.2 \times 10^{-9}M_P \sim 10^{10} {GeV}. Similar to conventional
curvaton scenario, the nonlinear parameter can be as large as .Comment: 6 pages, 2 figures, 2 tables; typos corrected, accepted for
publication in MPL
Nonlinear stability of solitons against strong external perturbations
We study soliton stability under the action of strong external perturbations. Limits on the weak perturbation approach are established with the help of average Lagrangian methods and full simulations. We found that for the same relative perturbation, larger amplitude solitons develop instability earlier than weaker amplitude solitons.F. B. Rizzato, G. I. de Oliveira, and A. C.-L. Chia
Multi-spectral optical imaging of the spatiotemporal dynamics of ionospheric intermittent turbulence
Equatorial plasma depletions have significant impact on radio wave propagation in the upper atmosphere, causing rapid fluctuations in the power of radio signals used in telecommunication and GPS navigation, thus playing a crucial role in space weather impacts. Complex structuring and self-organization of equatorial plasma depletions involving bifurcation, connection, disconnection and reconnection are the signatures of nonlinear evolution of interchange instability and secondary instabilities, responsible for the generation of coherent structures and turbulence in the ionosphere. The aims of this paper are three-fold: (1) to report the first optical imaging of reconnection of equatorial plasma depletions in the South Atlantic Magnetic Anomaly, (2) to investigate the optical imaging of equatorial ionospheric intermittent turbulence, and (3) to compare nonlinear characteristics of optical imaging of equatorial plasma depletions for two different altitudes at same times. We show that the degree of spatiotemporal complexity of ionospheric intermittent turbulence can be quantified by nonlinear studies of optical images, confirming the duality of amplitude-phase synchronization in multiscale interactions. By decomposing the analyses into North-South and East-West directions we show that the degree of non-Gaussianity, intermittency and multifractality is stronger in the North-South direction, confirming the anisotropic nature of the interchange instability. In particular, by using simultaneous observation of multi-spectral all-sky emissions from two different heights we show that the degree of non-Gaussianity and intermittency in the bottomside F-region ionosphere is stronger than the peak F-region ionosphere. Our results are confirmed by two sets of observations on the nights of 28 September 2002 and 9 November 2002.Abraham C.-L. Chian, José R. Abalde, Rodrigo A. Miranda, Felix A. Borotto, David L. Hysell, Erico L. Rempel, David Ruffol
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