Effect of acoustic oscillations on the drying of capillaryporous materials

1967 ◽  
Vol 13 (5) ◽  
pp. 394-398
Author(s):  
Yu. Ya. Borisov ◽  
N. M. Gynkina
Keyword(s):  
Acoustic Oscillations

scholarly journals Model-independent calibrations of gamma-ray bursts using machine learning

2021 ◽  
Vol 503 (3) ◽  
pp. 4581-4600
Author(s):  
Orlando Luongo ◽  
Marco Muccino
Keyword(s):  
Machine Learning ◽  
Dark Energy ◽  
Gamma Ray ◽  
Gamma Ray Bursts ◽  
Bayesian Regression ◽  
Machine Learning Techniques ◽  
Acoustic Oscillations ◽  
Chi Square ◽  
Model Independent ◽  
Chi Square Analysis

ABSTRACT We alleviate the circularity problem, whereby gamma-ray bursts are not perfect distance indicators, by means of a new model-independent technique based on Bézier polynomials. We use the well consolidate Amati and Combo correlations. We consider improved calibrated catalogues of mock data from differential Hubble rate points. To get our mock data, we use those machine learning scenarios that well adapt to gamma-ray bursts, discussing in detail how we handle small amounts of data from our machine learning techniques. We explore only three machine learning treatments, i.e. linear regression, neural network, and random forest, emphasizing quantitative statistical motivations behind these choices. Our calibration strategy consists in taking Hubble’s data, creating the mock compilation using machine learning and calibrating the aforementioned correlations through Bézier polynomials with a standard chi-square analysis first and then by means of a hierarchical Bayesian regression procedure. The corresponding catalogues, built up from the two correlations, have been used to constrain dark energy scenarios. We thus employ Markov chain Monte Carlo numerical analyses based on the most recent Pantheon supernova data, baryonic acoustic oscillations, and our gamma-ray burst data. We test the standard ΛCDM model and the Chevallier–Polarski–Linder parametrization. We discuss the recent H0 tension in view of our results. Moreover, we highlight a further severe tension over Ωm and we conclude that a slight evolving dark energy model is possible.

Gas phase mixing due to resonant acoustic oscillations in a cavity

1995 ◽  
Author(s):  
L Matta ◽  
C Zhu ◽  
J Jagoda ◽  
B Zinn
Keyword(s):  
Gas Phase ◽  
Acoustic Oscillations ◽  
Phase Mixing

scholarly journals Using Amorphous CoB Alloy as Transducer to Detect Acoustic Propagation and Heat Transport at Interface

2021 ◽  
Vol 11 (11) ◽  
pp. 5155
Author(s):  
Liu Jian ◽  
Gyung-Min Choi
Keyword(s):  
Heat Transport ◽  
Sapphire Substrate ◽  
Intermediate Layer ◽  
Thermal Conductance ◽  
Acoustic Oscillation ◽  
Acoustic Propagation ◽  
Acoustic Oscillations ◽  
Interfacial Coupling ◽  
Soft Layer ◽  
Substrate Interface

Acoustic oscillation provides useful information regarding the interfacial coupling between metal transducer layers and substrate materials. The interfacial coupling can be significantly reduced by a mechanically soft layer between the transducer and substrate. However, preserving a thin, soft layer at the interface during fabrication is often challenging. In this study, we demonstrate that an amorphous CoB alloy on top of a sapphire substrate can substantially amplify acoustic oscillations. By analyzing the attenuation of acoustic oscillations, we show that a thin, soft layer with a thickness of >2 ± 1 Å exists at the interface. The intermediate layer at the interface is further verified by investigating heat transport. By analyzing the slow decrease of the temperature of the transducer layer, we determine a thermal conductance of 35 ± 5 MW m−2 K−1 at the transducer/substrate interface. This low value supports the existence of a thin, soft layer at the interface. Our results demonstrate that an amorphous metal with B alloying effectively preserves the soft nature at the interface and detects the acoustic propagation and heat transport across it.

The use of magneto-acoustic oscillations as a plama diagnostic technique

1975 ◽  
Vol 14 (3) ◽  
pp. 373-387 ◽  
Author(s):  
J. J. B. Frommelt ◽  
Ieuan R. Jones
Keyword(s):  
Diagnostic Technique ◽  
Theoretical Description ◽  
Magnetized Plasma ◽  
Plasma Diagnostic ◽  
Acoustic Oscillations ◽  
Radial Profiles ◽  
Free Parameters ◽  
Field Disturbance ◽  
Neutral Cross Section ◽  
Afterglow Plasma

A theoretical and experimental investigation of the forced radial magnetoacoustic oscillations of a magnetized plasma column is presented in this paper. Forced magneto-acoustic oscillations of a magnetized argon afterglow plasma are generated continuously by passing an RF current through a solenoid wrapped around the discharge tube. The radial variation of the amplitude of the magnetic field disturbance [bz(r)] associated with these oscillations is measured at various times during the decay of the afterglow plasma. A theoretical description of these oscillations is developed in which the collision frequencies between the various plasma constituents are treated as free parameters. The values of these free parameters at any given instant during the decay of the plasma are determined by fitting computed bz{r) radial profiles to the measured ones. The electron temperature Te, and the ion-neutral cross section for momentum transfer QD are deduced from these collision frequencies. The reliability of this plasma diagnostic technique is demonstrated by its ability to yield values for Te and QD which compare favourably with the results obtained by other workers.

scholarly journals Measuring the distance–redshift relation with the baryon acoustic oscillations of galaxy clusters

2016 ◽  
Vol 458 (2) ◽  
pp. 1909-1920 ◽  
Author(s):  
A. Veropalumbo ◽  
F. Marulli ◽  
L. Moscardini ◽  
M. Moresco ◽  
A. Cimatti
Keyword(s):  
Galaxy Clusters ◽  
Acoustic Oscillations ◽  
Baryon Acoustic Oscillations

scholarly journals New constraints on H 0 and Ω m from SZE/X-ray data and baryon acoustic oscillations

2011 ◽  
Vol 44 (2) ◽  
pp. 501-508 ◽  
Author(s):  
R. F. L. Holanda ◽  
J. V. Cunha ◽  
J. A. S. Lima
Keyword(s):  
Acoustic Oscillations ◽  
X Ray ◽  
Baryon Acoustic Oscillations
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