Acoustic influences of front width in a coastal curved-front model

2016 ◽  
Vol 139 (4) ◽  
pp. 2197-2197
Author(s):  
Brendan J. DeCourcy ◽  
Ying-Tsong Lin ◽  
William L. Siegmann
Keyword(s):  
Front Width ◽  
Front Model

scholarly journals In-medium pion valence distributions in a light-front model

2017 ◽  
Vol 766 ◽  
pp. 125-131 ◽  
Author(s):  
J.P.B.C. de Melo ◽  
K. Tsushima ◽  
I. Ahmed
Keyword(s):  
Light Front ◽  
Front Model

Capillary water absorption by a porous cylinder

2017 ◽  
Vol 42 (2) ◽  
pp. 120-124 ◽  
Author(s):  
Christopher Hall
Keyword(s):  
Radial Flow ◽  
Effective Porosity ◽  
Capillary Absorption ◽  
Porous Cylinder ◽  
Capillary Water ◽  
Cylinder Axis ◽  
Flow Through ◽  
Front Model ◽  
Sharp Front ◽  
Good Agreement

Capillary absorption (imbibition) of water by a porous cylinder is described by means of a Sharp-Front model. The cumulative absorption increases as (time)1/2 at early times, but more slowly as the wet front approaches the cylinder axis. Results are given in terms of dimensionless variables. Experimental data on plaster cylinders are in good agreement with theory. Estimates of the sorptivity and effective porosity of the material can be obtained. The model may be useful in testing drilled cores and may also be applied to radial flow through the wall of a porous tube (hence to conduits and arches).

Scaling for deuteron structure functions in a relativistic light-front model

1996 ◽  
Vol 53 (6) ◽  
pp. 3111-3130 ◽  
Author(s):  
W. N. Polyzou ◽  
W. Glöckle
Keyword(s):  
Structure Functions ◽  
Light Front ◽  
Front Model

scholarly journals Tree crowns grow into self-similar shapes controlled by gravity and light sensing

2018 ◽  
Vol 15 (142) ◽  
pp. 20170976 ◽  
Author(s):  
Laurent Duchemin ◽  
Christophe Eloy ◽  
Eric Badel ◽  
Bruno Moulia
Keyword(s):  
Tree Growth ◽  
Initial Conditions ◽  
Tree Crown ◽  
Tree Crowns ◽  
Light Sensing ◽  
The Core ◽  
Long Period ◽  
Self Similar ◽  
Similar Solutions ◽  
Front Model

Plants have developed different tropisms: in particular, they reorient the growth of their branches towards the light (phototropism) or upwards (gravitropism). How these tropisms affect the shape of a tree crown remains unanswered. We address this question by developing a propagating front model of tree growth. Being length-free, this model leads to self-similar solutions after a long period of time, which are independent of the initial conditions. Varying the intensities of each tropism, different self-similar shapes emerge, including singular ones. Interestingly, these shapes bear similarities to existing tree species. It is concluded that the core of specific crown shapes in trees relies on the balance between tropisms.

scholarly journals Microwave Burst Timescales and Solar Flare Acceleration Processes

1994 ◽  
Vol 142 ◽  
pp. 683-688
Author(s):  
A. Krüger ◽  
B. Kliem ◽  
J. Hildebrandt ◽  
V. V. Zaitsev
Keyword(s):  
Electric Circuit ◽  
Magnetic Loop ◽  
Circuit Model ◽  
Simultaneous Occurrence ◽  
Loop Model ◽  
Coalescence Model ◽  
Solar Microwave ◽  
Fine Structures ◽  
Time Structures ◽  
Front Model

AbstractThe occurrence of quite different timescales in solar microwave bursts is considered and possible ways of their physical interpretation are discussed. An interesting feature is the existence of hierarchic time structures, an example of which is provided by the solar event of 1991 March 23.Plasma parameter sets to be invoked for the interpretation of timescales are estimated on the base of different models such as the collisionless conduction front model, the twisted magnetic loop model, the coalescence model, and the electric circuit model. With emphasis on the interpretation of burst fine structures with timescales of a few seconds the coalescence model has been favored. On the other hand, the simultaneous occurrence of a large range of different timescales appears well suited to be described by the circuit model.Subject headings: acceleration of particles — Sun: flares — Sun: radio radiation

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