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The earliest phases of high-mass star formation, as seen in NGC 6334 by <i>Herschel</i>-HOBYS
Tigé,, J.,Motte, F.,Russeil, D.,Zavagno, A.,Hennemann, M.,Schneider, N.,Hill, T.,Nguyen Luong, Q.,Di Francesco, J.,Bontemps, S.,Louvet, F.,Didelon, P.,Kö,nyves, V.,André,, Ph.,Leuleu, Springer-Verlag 2017 Astronomy and astrophysics Vol.602 No.-
N. Chevalier,F. Chandezon,J. Bleuse,J.C. Woehl,J.F. Motte,M. Stark,M.J. Nasse,P. Reiss,S. Huant 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
We present a method to realize active optical tips for use in near-field optics that can operate at room temperature. A metal-coated optical tip is covered with a thin polymer layer stained with CdSe nanocrystals at low density. The time analysis of the emission rate of the active tip and the analysis of its emission spectra reveal that a very small number of particles - possibly down to only one nanocrystal - can be made active at the tip apex. This opens the way to optics with a single nanocrystal as a light source.
Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub
Rayner, T. S. M.,Griffin, M. J.,Schneider, N.,Motte, F.,Kö,nyves, V.,André,, P.,Di Francesco, J.,Didelon, P.,Pattle, K.,Ward-Thompson, D.,Anderson, L. D.,Benedettini, M.,Bernard, J.-P.,Bonte Springer-Verlag 2017 Astronomy and astrophysics Vol.607 No.-
Young Stellar Objects in the Massive Star-forming Regions W51 and W43
Saral, G.,Hora, J. L.,Audard, M.,Koenig, X. P.,Martí,nez-Galarza, J. R.,Motte, F.,Nguyen-Luong, Q.,Saygac, A. T.,Smith, H. A. American Astronomical Society 2017 The Astrophysical journal Vol.839 No.2
<P>We present the results of our investigation of the star-forming complexes W51 and W43, two of the brightest in the first Galactic quadrant. In order to determine the young stellar object (YSO) populations in W51 and W43 we used color-magnitude relations based on Spitzer mid-infrared and 2MASS/UKIDSS near-infrared data. We identified 302 Class I YSOs and 1178 Class II/transition disk candidates in W51, and 917 Class I YSOs and 5187 Class II/transition disk candidates in W43. We also identified tens of groups of YSOs in both regions using the Minimal Spanning Tree (MST) method. We found similar cluster densities in both regions, even though Spitzer was not able to probe the densest part of W43. By using the Class II/I ratios, we traced the relative ages within the regions and, based on the morphology of the clusters, we argue that several sites of star formation are independent of one another in terms of their ages and physical conditions. We used spectral energy distribution-fitting to identify the massive YSO (MYSO) candidates since they play a vital role in the star formation process, and then examined them to see if they are related to any massive star formation tracers such as UCH II regions, masers, or dense fragments. We identified 17 MYSO candidates in W51, and 14 in W43, respectively, and found that groups of YSOs hosting MYSO candidates are positionally associated with H II regions in W51, though we do not see any MYSO candidates associated with previously identified massive dense fragments in W43.</P>
THE SCALING RELATIONS AND STAR FORMATION LAWS OF MINI-STARBURST COMPLEXES
Nguyê,̃,n-Lu’o, Quang,Nguyê,̃,n, Hans V. V.,Motte, Fredé,rique,Schneider, Nicola,Fujii, Michiko,Louvet, Fabien,Hill, Tracey,Sanhueza, Patricio,Chibueze, James O.,Didelon, P American Astronomical Society 2016 The Astrophysical journal Vol.833 No.1
<P>The scaling relations and star formation laws for molecular cloud complexes (MCCs) in the Milky Way are investigated. MCCs are mostly large (R> 50 pc), massive (similar to 106 M circle dot) gravitationally unbound cloud structures. We compare their masses M-gas, mass surface densities Sigma(Mgas), radii R, velocity dispersions sigma, star formation rates (SFRs), and SFR densities Sigma(SFR) with those of structures ranging from cores, clumps, and giant molecular clouds, to MCCs, and galaxies, spanning eight orders of magnitudes in size and 13 orders of magnitudes in mass. This results in the following universal relations: sigma similar to R-0.5, M-gas similar to R-2, Sigma(SFR) similar to Sigma(1.5)(Mgas) , SFR similar to M-gas(0.9) , and SFR similar to sigma(2.7) Variations in the slopes and coefficients of these relations are found at individual scales, signifying different physics acting at different scales. Additionally, there are breaks at the MCC scale in the sigma-R relation and between starburst and normal star-forming objects in the SFR-M-gas and Sigma(SFR)-Sigma(Mgas) gas relations. Therefore, we propose to use the Schmidt-Kennicutt diagram to distinguish starburst from normal star-forming structures by applying a SMgas threshold of similar to 100M circle dot pc (2) and a Sigma(SFR) threshold of 1M circle dot yr (1) kpc (2). Mini-starburst complexes are gravitationally unbound MCCs that have enhanced Sigma(SFR) (> 1M circle dot yr(-1) kpc(-2)), probably caused by dynamic events such as radiation pressure, colliding flows, or spiral arm gravitational instability. Because of dynamical evolution, gravitational boundedness does not play a significant role in regulating the star formation activity of MCCs, especially the mini-starburst complexes, which leads to the dynamical formation of massive stars and clusters. We emphasize the importance of understanding mini-starbursts in investigating the physics of starburst galaxies.</P>
재태 서,A. Wang,A. Mott,C. Pompey,D. Temple,J. Anderson,J. H. Kim,J. L. Qu,M. Namkung,Q. Yang,Q. Wang,S. Creekmore,S. S. Jung,W. Yu,X. Peng 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
Nonlinear optical properties of cadmium telluride semiconductor nanocrystals were investigated for optical power self-limiting application. The semiconductor nanocrystals were synthesized through colloidal methods. The nonlinear refraction and the nonlinear figure of merit of CdTe nanocrystals in toluene ($\sim$8 $\times$ 10$^{-5}$ mol/L) were estimated to be $\sim$ -1 $\times$ 10$^{-13}$ m$^2$/W and $\sim$200, respectively. The optical power limiting through CdTe nanoscale materials was mainly by the nonlinear refraction because of the high nonlinear FOM.
( Taylor Braden ),( Madison Burtch ),( Samantha Mott ),( Alexandria Pyle ),( Lee Atkins ),( Heather Braden ) 대한신경치료학회 2021 신경치료 Vol.25 No.1
Purpose Assessing functional mobility is an important aspect of determining fall risk in the growing population of assisted living. Little is known about the sit-to-walk (STW) transition, especially what characteristics correlate with the duration it takes to perform a STW. Methods In this cross-sectional, exploratory study, 45 assisted living residents were evaluated for baseline measures: history of falls, assistive device (AD), lower-extremity strength, and balance (Tinetti POMA). The residents were then timed performing a STW, and, from these durations, were stratified into fast and slow groups. Statistical analysis was performed to determine relationships between the two duration groups and the baseline measures. Results Participants who had experienced a fall were significantly more likely to use an assistive device (p = 0.001). The use of an AD had a moderate negative correlation with composite strength (r = -0.428, p = 0.003). Duration of STW had a weak negative correlation with composite strength (r = -0.299, p = 0.046) and a moderate correlation with use of AD (r = 0.419, p = 0.004). Those with a faster duration of STW had significantly better balance (p = 0.027). Conclusion These correlations support the need for healthcare professionals to address the use of adaptive equipment and physical training when evaluating functional mobility in assisted living residents. Providing appropriate equipment and improving overall strength in these individuals can help reduce their risk of falls. Individuals in assisted living facilities can be assessed similar to other geriatric populations, with special consideration on functional tasks and measures.
CAPS markers specific to E<sup>b</sup>, E<sup>e</sup>, and R genomes in the tribe Triticeae
Somers, D.J.,Li, X.-M.,Lee, B.S.,Mammadov, A.C.,Koo, B.-C.,Mott, I.W.,Wang, R.R.-C. Canadian Science Publishing 2007 Genome Vol.50 No.4
<P> Wild Triticeae grasses serve as important gene pools for forage and cereal crops. Understanding their genome compositions is pivotal for efficient use of this vast gene pool in germplasm-enhancement programs. Several cleaved amplified polymorphic sequence (CAPS) markers were developed to distinguish the E<SUP>b</SUP>, E<SUP>e</SUP>, and R genomes. With the aid of disomic addition lines of wheat, it was confirmed that all 7 chromosomes of E<SUP>b</SUP>, E<SUP>e</SUP>, and R genomes carry these genome-specific CAPS markers. Thus, the identified CAPS markers are useful in detecting and monitoring the chromosomes of these 3 genomes. This study also provides evidence suggesting that some Purdue and Chinese germplasm lines developed for barley yellow dwarf virus (BYDV) resistance are different from those developed in Australia. Furthermore, Thinopyrum intermedium and Thinopyrum ponticum were shown to have different genome constitutions. Sequence analyses of the 1272 bp sequences, containing Ty3/gypsy retrotransposons, from the E<SUP>b</SUP>, E<SUP>e</SUP>, and R genomes also shed light on the evolution of these 3 genomes. </P>