Zobrazeno 1 - 10
of 367
pro vyhledávání: '"J J Niemela"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-13 (2024)
Abstract In this study, we report observations of propagating radial carpet beams (RCBs) through a turbulent atmosphere at ground level with a 120 m path length. RCBs are a class of nondiffracting, accelerating, self-healing, and self-amplifying beam
Externí odkaz:
https://doaj.org/article/96b38ee225384df6a483f6961d4f078c
Publikováno v:
Journal of the Optical Society of America. A, Optics, image science, and vision. 39(9)
We report on applications of moiré deflectometry in measurements of the anisotropy and scaling of the phase structure function (PSF), obtained after passing a laser beam through an indoor enclosure containing convective air turbulence. We combine th
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6abcaa2b919270b344283fbaf444aa58
https://pubmed.ncbi.nlm.nih.gov/36215632
https://pubmed.ncbi.nlm.nih.gov/36215632
Publikováno v:
Open Journal of Air Pollution. :27-36
The performance of the California Puff (CALPUFF) modelling system has been evaluated using a case study in Ghana. The performance evaluation consisted of a quantitative comparison of dispersion simulation results of SO2 and NO2 with measurements at t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::738046685bc9239449129b3e5d30a6b2
https://doi.org/10.4236/ojap.2016.51003
https://doi.org/10.4236/ojap.2016.51003
Publikováno v:
Journal of Low Temperature Physics; November 2002, Vol. 129 Issue: 3-4 p213-213, 1p
Autor:
J. J. Niemela
Publikováno v:
Journal of Low Temperature Physics. 134:447-456
This paper considers the manner in which low temperature helium gas is used to generate turbulent convection, reviews the lessons learned so far, and finally suggests a possible experiment that draws upon these lessons and should yield unambiguous re
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::98351a896550bfd5bc51f93eb5472b10
https://doi.org/10.1023/b:jolt.0000012594.47945.f6
https://doi.org/10.1023/b:jolt.0000012594.47945.f6
Publikováno v:
Journal of Physics: Condensed Matter. 11:7761-7781
Cryogenic helium is of significant value in generating, and studying, the highest possible Reynolds and Rayleigh number flows under controlled laboratory conditions, primarily due to its extremely low value of kinematic viscosity. We consider here cr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ca3ff1747c92bf51f36e64e17f98c361
https://doi.org/10.1088/0953-8984/11/40/308
https://doi.org/10.1088/0953-8984/11/40/308
Autor:
Rasouli, Saifollah1,2 (AUTHOR) rasouli@iasbs.ac.ir, Bagheri, Mohammad1 (AUTHOR), Niemela, J. J.3 (AUTHOR)
Publikováno v:
Scientific Reports. 8/8/2024, Vol. 14 Issue 1, p1-13. 13p.
Autor:
J. J. Niemela
Publikováno v:
Astrophysics and Space Science Proceedings ISBN: 9781402088674
Turbulence is a complex phenomenon, characterized by many interacting degrees of spatial and temporal freedom. It is widespread, and indeed nearly the rule, in the flow of classical fluids. The complexity of the underlying equations has impeded analy
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee492705648b6873d4df8e92edf2087a
https://doi.org/10.1007/978-1-4020-8868-1_1
https://doi.org/10.1007/978-1-4020-8868-1_1
Autor:
J J Niemela
Publikováno v:
Physica Scripta. :014059
Measurements of the dimensionless heat transfer rate, or Nusselt number Nu, are typically made by static measurements of the heat flux and the average resulting temperature difference across a horizontal layer of fluid under steady state conditions.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6edc2020d1639a21fb9f44fcd36ce088
https://doi.org/10.1088/0031-8949/2013/t155/014059
https://doi.org/10.1088/0031-8949/2013/t155/014059
Autor:
J J Niemela
Publikováno v:
Physica Scripta. :014003
This talk describes experimental observations of Rayleigh–Benard convection at very high Rayleigh numbers using cryogenic helium gas as the working fluid. Here, a cylindrical container with diameter-to-height aspect ratio unity was subject to unste
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c7ea4de2fce8bb021d3e6827e60cbb00
https://doi.org/10.1088/0031-8949/2008/t132/014003
https://doi.org/10.1088/0031-8949/2008/t132/014003