Energy balance for weak formulation of diffraction by lossy anisotropic inhomogeneous gratings

We consider a problem modeling the steady flow of a compressible heat conducting Newtonian fluid subject to the slip boundary condition for the velocity. Assuming the pressure law of the form p(ϱ, ϑ) ~ ϱγ + ϱϑ, we show (under additional assumptions on the heat conductivity and the viscosity) that for any γ > 1 there exists a variational entropy solution to our problem (i.e. the weak formulation of the total energy balance is replaced by the entropy inequality and the global total energy balance). Moreover, if [Formula: see text] (together with further restrictions on the heat conductivity), the solution is in fact a weak one. The results are obtained without any restriction on the size of the data.

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Effects of Ambipolar Diffusion on Prominence Thread Models

International Astronomical Union Colloquium ◽

10.1017/s0252921100025513 ◽

1994 ◽

Vol 144 ◽

pp. 315-321 ◽

Cited By ~ 1

Author(s):

M. G. Rovira ◽

J. M. Fontenla ◽

J.-C. Vial ◽

P. Gouttebroze

Keyword(s):

Energy Balance ◽

Transition Region ◽

Ambipolar Diffusion ◽

Line Profiles ◽

Balance Equations ◽

Model Calculations ◽

Partial Frequency ◽

Frequency Redistribution ◽

Partial Frequency Redistribution ◽

Theoretical Structure

AbstractWe have improved previous model calculations of the prominence-corona transition region including the effect of the ambipolar diffusion in the statistical equilibrium and energy balance equations. We show its influence on the different parameters that characterize the resulting prominence theoretical structure. We take into account the effect of the partial frequency redistribution (PRD) in the line profiles and total intensities calculations.

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Influence of Magnetic Fields on Solar Hydrodynamics: Experimental Results

International Astronomical Union Colloquium ◽

10.1017/s025292110005329x ◽

1977 ◽

Vol 36 ◽

pp. 143-180 ◽

Cited By ~ 10

Author(s):

J.O. Stenflo

Keyword(s):

Solar Activity ◽

Energy Balance ◽

Magnetic Fields ◽

Solar Atmosphere ◽

General Problem ◽

Solar Rotation ◽

Active Regions ◽

Physical Conditions ◽

Dynamic Phenomena

It is well-known that solar activity is basically caused by the Interaction of magnetic fields with convection and solar rotation, resulting in a great variety of dynamic phenomena, like flares, surges, sunspots, prominences, etc. Many conferences have been devoted to solar activity, including the role of magnetic fields. Similar attention has not been paid to the role of magnetic fields for the overall dynamics and energy balance of the solar atmosphere, related to the general problem of chromospheric and coronal heating. To penetrate this problem we have to focus our attention more on the physical conditions in the ‘quiet’ regions than on the conspicuous phenomena in active regions.

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Integrating cognitive and environmental influences on energy-balance related behaviour

PsycEXTRA Dataset ◽

10.1037/e524352011-101 ◽

2006 ◽

Cited By ~ 1

Author(s):

G. J. De Bruijn ◽

S. Kremers ◽

Mechelen W. Van ◽

J. Brug

Keyword(s):

Energy Balance ◽

Environmental Influences

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Circulating Concentrations of Human Peptide YY: Influence of Acute and Chronic Energy Balance Changes

Experimental and Clinical Endocrinology & Diabetes ◽

10.1055/s-2005-862856 ◽

2005 ◽

Vol 113 (S 1) ◽

Cited By ~ 1

Author(s):

B Otto ◽

H Rochlitz ◽

M Möhlig ◽

L Burget ◽

J Kampe ◽

...

Keyword(s):

Energy Balance ◽

Peptide Yy

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Influence of acute and chronic energy balance changes on circulating concentrations of human peptide YY

Zeitschrift für Gastroenterologie ◽

10.1055/s-2005-921815 ◽

2005 ◽

Vol 43 (10) ◽

Author(s):

B Otto ◽

F Lippl ◽

P Pfluger ◽

J Spranger ◽

U Cuntz ◽

...

Keyword(s):

Energy Balance ◽

Peptide Yy

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Parametric Study of Photovoltaic Thermal Solar Collector Using An Improved Parallel Flow

Journal of Engineering Technology and Applied Physics ◽

10.33093/jetap.2020.2.1.4 ◽

2020 ◽

Vol 2 (1) ◽

pp. 19-24

Author(s):

Sakhr Mohammed Sultan ◽

Chih Ping Tso ◽

Ervina Efzan Mohd Noor ◽

Fadhel Mustafa Ibrahim ◽

Saqaff Ahmed Alkaff

Keyword(s):

Thermal Conductivity ◽

Energy Balance ◽

Parametric Study ◽

Solar Collector ◽

Parallel Flow ◽

Operating Conditions ◽

Balance Equations ◽

Conductivity Type ◽

Pv Module ◽

Sunny Weather

Photovoltaic Thermal Solar Collector (PVT) is a hybrid technology used to produce electricity and heat simultaneously. Current enhancements in PVT are to increase the electrical and thermal efficiencies. Many PVT factors such as type of absorber, thermal conductivity, type of PV module and operating conditions are important parameters that can control the PVT performance. In this paper, an analytical model, using energy balance equations, is studied for PVT with an improved parallel flow absorber. The performance is calculated for a typical sunny weather in Malaysia. It was found that the maximum electrical and thermal efficiencies are 12.9 % and 62.6 %, respectively. The maximum outlet water temperature is 59 oC.

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