large separation
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Author(s):  
Feng Gao ◽  
Frank Eisenhauer ◽  
Julien Woillez ◽  
Pierre Bourget ◽  
Bruno Chazelas ◽  
...  

2020 ◽  
Vol 32 (10) ◽  
pp. 101702 ◽  
Author(s):  
Yan-Chao Hu ◽  
Wen-Feng Zhou ◽  
Yan-Guang Yang ◽  
Zhi-Gong Tang

2019 ◽  
Vol 79 (11) ◽  
Author(s):  
A. D. Bolognino ◽  
Francesco Giovanni Celiberto ◽  
M. Fucilla ◽  
D. Yu. Ivanov ◽  
A. Papa

AbstractThe inclusive hadroproduction of two heavy quarks, featuring a large separation in rapidity, is proposed as a novel probe channel of the Balitsky–Fadin–Kuraev–Lipatov (BFKL) approach. In a theoretical setup which includes full resummation of leading logarithms in the center-of-mass energy and partial resummation of the next-to-leading ones, predictions for the cross section and azimuthal coefficients are presented for kinematic configurations typical of current and possible future experimental analyses at the LHC.


2019 ◽  
Vol 631 ◽  
pp. A140 ◽  
Author(s):  
Benjamin Evano ◽  
François Lignières ◽  
Bertrand Georgeot

Context. Interpreting the oscillations of massive and intermediate mass stars remains a challenging task. In fast rotators, the oscillation spectrum of p-modes is a superposition of sub-spectra which corresponds to different types of modes, among which island modes and chaotic modes are expected to be the most visible. This paper is focused on chaotic modes, which have not been thoroughly studied before. Aims. We study the properties of high frequency chaotic p-modes in a polytropic model. Unexpected peaks appear in the frequency autocorrelations of the spectra. Our goal is to find a physical interpretation for these peaks and also to provide an overview of the mode properties. Methods. We used the 2D oscillation code “TOP” to produce the modes and acoustic ray simulations to explore the wave properties in the asymptotic regime. Using the tools developed in the field of quantum chaos (or wave chaos), we derived an expression for the frequency autocorrelation involving the travel time of acoustic rays. Results. Chaotic mode spectra were previously thought to be irregular, that is, described only through their statistical properties. Our analysis shows the existence, in chaotic mode spectra, of a pseudo large separation. This means that chaotic modes are organized in series, such that the modes in each series follow a nearly regular frequency spacing. The pseudo large separation of chaotic modes is very close to the large separation of island modes. Its value is related to the sound speed averaged over the meridional plane of the star. In addition to the pseudo large separation, other correlations appear in the numerically calculated spectra. We explain their origin by the trapping of acoustic rays near the stable islands.


2019 ◽  
Vol 628 ◽  
pp. A106
Author(s):  
A. Bonanno ◽  
E. Corsaro ◽  
F. Del Sordo ◽  
P. L. Pallé ◽  
D. Stello ◽  
...  

We present further evidence of acoustic oscillations in the slowly rotating overactive G8 sub-giant EK Eri. This star was observed with the 1m Hertzsprung SONG telescope at the Observatorio del Teide for two different runs of 8 and 13 nights, respectively, that were separated by about a year. We determined a significant excess of power around νmax = 253 ± 3 μHz in the first observing run and were able to determine a large separation, Δν = 16.43 ± 0.22 μHz. No significant excess of power was instead detected in a subsequent SONG observing season, as also supported by our analysis of the simultaneous TESS photometric observations. We propose a new amplitude-luminosity relation in order to account for the missing power in the power spectrum. Based on the evolutionary stage of this object, we argue that a standard α2Ω dynamo cannot be excluded as the possible origin for the observed magnetic field.


2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
S. M. Khatami ◽  
H. Naderpour ◽  
R. C. Barros ◽  
R. Jankowski

Insufficient separation distance between adjacent buildings may lead to serious damages during earthquakes due to structural pounding. The best way to prevent collisions is to provide sufficiently large separation distance between structures. In this paper, the periods of two closely spaced linear and nonlinear buildings have been investigated so as to accurately assess the minimum in-between separation gap. A new equation to calculate the effective periods of inelastic buildings has been proposed, and its effectiveness has been verified through numerical analysis. The results of the investigation conducted for inelastic buildings with different number of stories indicate that the proposed formula allows us to prevent earthquake-induced structural pounding by ensuring an adequate value of seismic gap.


Author(s):  
A.C. Idris ◽  
M.R. Saad ◽  
K. Kontis

Global measurement approach in characterizing a generic scramjet inlet has enabled the investigation of various flow phenomena typically occurred on an inlet to be investigated further. This paper examines the effectiveness of microvortex generator (MVG) array in suppressing boundary layer separations on such an inlet. Global measurement of pressure and temperature were employed to visualize vortex pairs emanating from the MVG. The global pressure map showed the benefit of lower reattachment peak pressure that usually accompanies the large separation bubble at a scramjet inlet throat.


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