Investigation of spatial distribution of neutron production rate and its dependency on pressure in spherical IEFC by one-dimensional simulations

2006 ◽  
Author(s):  
K. Noborio ◽  
T. Sakai ◽  
Y. Yamamoto
Keyword(s):  
Spatial Distribution ◽  
Production Rate ◽  
Neutron Production ◽  
One Dimensional

scholarly journals Between Waves and Diffusion: Paradoxical Entropy Production in an Exceptional Regime

Entropy ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 881 ◽  
Author(s):  
Karl Hoffmann ◽  
Kathrin Kulmus ◽  
Christopher Essex ◽  
Janett Prehl
Keyword(s):  
Entropy Production ◽  
Production Rate ◽  
Fractional Diffusion ◽  
Diffusion Equations ◽  
Irreversible Processes ◽  
Entropy Production Rate ◽  
Continuous Space ◽  
One Dimensional ◽  
Fractional Diffusion Equations ◽  
And Diffusion

The entropy production rate is a well established measure for the extent of irreversibility in a process. For irreversible processes, one thus usually expects that the entropy production rate approaches zero in the reversible limit. Fractional diffusion equations provide a fascinating testbed for that intuition in that they build a bridge connecting the fully irreversible diffusion equation with the fully reversible wave equation by a one-parameter family of processes. The entropy production paradox describes the very non-intuitive increase of the entropy production rate as that bridge is passed from irreversible diffusion to reversible waves. This paradox has been established for time- and space-fractional diffusion equations on one-dimensional continuous space and for the Shannon, Tsallis and Renyi entropies. After a brief review of the known results, we generalize it to time-fractional diffusion on a finite chain of points described by a fractional master equation.

Cometary evolution and cryovolcanism 1This article is part of a Special issue that honours the work of Dr. Donald M. Hunten FRSC who passed away in December 2010 after a very illustrious career.

2012 ◽  
Vol 90 (8) ◽  
pp. 807-815 ◽  
Author(s):  
Michael J.S. Belton
Keyword(s):  
Spatial Distribution ◽  
Production Rate ◽  
Large Scale ◽  
Special Issue ◽  
Apparent Absence ◽  
Cometary Nuclei ◽  
Evolutionary Hypothesis ◽  
Wide Range ◽  
Show Evidence ◽  
Cometary Activity

Recent space observations of cometary nuclei show evidence of internal (cryovolcanic) activity while retaining aspects of their primitive origins. Using discoveries made during the two most recent cometary encounters: EPOXI at 103P/Hartley 2 and Stardust-NExT at 9P/Tempel 1, we test a hypothesis for their physical evolution, which, if true, could provide a unified basis for understanding the relative ages of their surfaces and the causes of a wide range of cometary activity. We show: (i) that the categorization of 103P/Hartley 2 as hyperactive is not a reflection of the extent of activity over the surface of the nucleus for which we find a normal H2O production rate; (ii) that the heterogeneous spatial distribution of CO2 and H2O in the inner comae of 9P/Tempel 1 and 103P/Hartley 2 is best explained by processes associated with cometary activity rather than the presence of primitive compositional heterogeneities in the nucleus; and (iii) that most of the quasi-circular depressions seen on the surface of 9P/Tempel are the result of outburst activity. The apparent absence of circular depressions and large scale layering on 103P/Hartley 2 present a challenge to the evolutionary hypothesis although the small size of its nucleus may ultimately provide an explanation.

One-dimensional coherent four-wave mixing as a way to image the spatial distribution of atoms in a laser-produced plasma

1999 ◽  
Vol 24 (7) ◽  
pp. 478 ◽  
Author(s):  
D. A. Akimov ◽  
A. B. Fedotov ◽  
N. I. Koroteev ◽  
A. N. Naumov ◽  
D. A. Sidorov-Biryukov ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Four Wave Mixing ◽  
Wave Mixing ◽  
One Dimensional ◽  
Laser Produced Plasma

scholarly journals Growth dynamics of the branching system in grasses: an architecture-based methodology for quantitative evaluation applied to two genotypes of Paspalum vaginatum

Rodriguésia ◽  
2019 ◽  
Vol 70 ◽  
Author(s):  
Liliana Teresa Fabbri ◽  
Pedro Insausti ◽  
William B. Batista ◽  
Gabriel H. Rua
Keyword(s):  
Spatial Distribution ◽  
Production Rate ◽  
Environmental Conditions ◽  
Reproductive Effort ◽  
Growth Dynamics ◽  
Vegetative Cover ◽  
Branching Order ◽  
Aerial Growth ◽  
Paspalum Vaginatum ◽  
Branching System

Abstract The aerial growth dynamics of the shoots of the widespread turfgrass Paspalum vaginatum was studied. With the aim of identifying quantitative differential features between two genotypes, plants were cultivated outdoors in pots during two consecutive summers. Axes of different branching order were marked for periodical observation to quantify internode production rate, axis production rate, covering rate and reproductive effort. The genotypes differed significantly in the following quantitative features: plagiotropic vs. orthotropic axes proportion, internode production rate, flowering vs. vegetative tiller ratio, vegetative cover and spatial distribution of the canopy. Knowledge of these features may help to understand the great plasticity and adaptability of this species to multiple environmental conditions.

The production rate and spatial distribution of H2O for Comet P/Halley

1990 ◽  
Vol 364 ◽  
pp. 687 ◽  
Author(s):  
Uwe Fink ◽  
Michael A. Disanti
Keyword(s):  
Spatial Distribution ◽  
Production Rate
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