Cyclotron radio emission in plasma with steep temperature gradient

Solar Physics ◽  
1984 ◽  
Vol 94 (1) ◽  
pp. 105-115 ◽  
Author(s):  
M. Siarkowski
Keyword(s):  
Temperature Gradient ◽  
Radio Emission ◽  
Steep Temperature Gradient

SOI Structures Prepared by Lateral Annealing of a-Si Films in Steep Temperature Gradient

1990 ◽  
Author(s):  
Yasuhiro KIZU ◽  
Keiichi KONDA ◽  
Masaki TAKEUCHI ◽  
Akio KITAGAWA ◽  
Masakuni SUZUKI
Keyword(s):  
Temperature Gradient ◽  
Steep Temperature Gradient ◽  
Si Films

Helium line emission: its relation to atmospheric structure

1980 ◽  
Vol 297 (1433) ◽  
pp. 541-554 ◽  
Keyword(s):  
Temperature Gradient ◽  
Transition Region ◽  
Scaling Laws ◽  
Coronal Holes ◽  
Emission Measure ◽  
Line Emission ◽  
Electron Pressure ◽  
Steep Temperature Gradient ◽  
Region Temperature ◽  
Higher Temperature

A brief review is given of observations of the resonance lines of He I and He II and their interpretation. As discussed in a previous paper, the helium lines are anomalously strong in the quiet Sun when compared with other transition region lines. The enhancement can be brought about by the transient excitation of the lines by electrons of higher temperature than that which determines the ion population. The variation in the intensity of the helium lines relative to those of other transition region lines appears to be related to variations in the temperature gradient between different parts of the atmosphere. To relate the degree of enhancement to other observable parameters, such as electron pressure and absolute line intensities, and thus to the structure of the atmosphere, a method for analysing the emission measure distribution previously developed in the context of the quiet atmosphere and active region loops is applied also to coronal holes. It is proposed that the non-thermal ion motions observed in the transition region can provide the required mechanism for transporting the helium ions across the steep temperature gradient. By making a simple model, an expression is developed which relates the helium enhancement to the non-thermal motions, the transition region temperature gradient and the electron pressure. The scaling laws implied can be tested against further observations when they become available.

Furnace for growing single crystals in a very steep temperature gradient

1970 ◽  
Vol 1 (2) ◽  
pp. K63-K64
Author(s):  
H. D. Riccius ◽  
W. E. E. Berger ◽  
C. J. van der Hoeven
Keyword(s):  
Temperature Gradient ◽  
Single Crystals ◽  
Steep Temperature Gradient

scholarly journals Simplification of sound-pressure characteristics using narrow flow channels subject with temperature gradient

2018 ◽  
Vol 192 ◽  
pp. 02025
Author(s):  
Tomoaki Kyoden
Keyword(s):  
Temperature Gradient ◽  
Heat Energy ◽  
Wire Mesh ◽  
Thermoacoustic Engine ◽  
Sound Energy ◽  
Flow Channels ◽  
Mesh Screen ◽  
Steep Temperature Gradient ◽  
Noise Energy ◽  
Made In

A thermoacoustic engine is one of promising system for utilization of unused energy. The object of this paper is to study the system of unused energy, such as heat energy and sound energy in noise using thermoacoustic engine. The thermoacoustic engine is composed of a stack sandwiched by two heat exchangers and tube. The stack has many narrow flow channels and its length for 50 mm. For example, in order to create narrow flow channels, the stack is comprised of wire-mesh screen. When the steep temperature gradient is made in the stack, a self-exited gas oscillation is generated. Thus, heat energy can be converted into sound energy. In this paper, thermoacoustic conversion device applied for noise energy generated from engine plants was presented. The noise has complicated frequency characteristics and low energy density. We demonstrated selective amplification of acoustic pressure only one-frequency in noise by utilization of the technique of thermoacoustic engine. In addition, the other frequencies were attenuated by viscosity dissipation in the stack. Summarizing these results, the simplification and amplified sound was created from complex noise.

scholarly journals 3P190 Rotation of mitotic spindle in HeLa cell under steep temperature gradient(Cell biology,The 48th Annual Meeting of the Biophysical Society of Japan)

2010 ◽  
Vol 50 (supplement2) ◽  
pp. S178
Author(s):  
Masahiro Motoyoshi ◽  
Madoka Suzuki ◽  
Kotaro Oyama ◽  
Takeshi Itabashi ◽  
Shin'ichi Ishiwata
Keyword(s):  
Temperature Gradient ◽  
Hela Cell ◽  
Annual Meeting ◽  
Mitotic Spindle ◽  
Cell Biology ◽  
Steep Temperature Gradient ◽  
Biophysical Society

scholarly journals Nonlocal electron transport in laser created plasmas

1994 ◽  
Vol 12 (3) ◽  
pp. 387-400 ◽  
Author(s):  
P. Mora ◽  
J.F. Luciani
Keyword(s):  
Heat Flux ◽  
Heat Flow ◽  
Temperature Gradient ◽  
Collision Operator ◽  
Mean Free Path ◽  
Electron Collision ◽  
Large Temperature ◽  
Laser Plasma Interaction ◽  
Electron Heat ◽  
Steep Temperature Gradient

The classical linear Spitzer-Härm formula has been shown to lead to an overestimation of the electron heat flux in laser-plasma interaction experiments. We briefly review the classical theory of heat transport in a plasma, and give a simplified demonstration of the Spitzer-Härm formula. The electron heat conductivity is calculated for a large value of the ion charge Z. Correction due to a finite value of Z is evaluated with a simplified electron-electron collision operator. We then show that in a steep temperature gradient, the collisional mean free path of the electrons that transport the energy may be larger than the scale length of the temperature gradient. In this case the Spitzer-Härm formula overestimates the actual heat flux in the main part of the temperature gradient, and predicts a too small heat flux slightly away from the location of the large temperature gradient.A nonlocal macroscopic formula, which is a sort of convolution of the Spitzer-Härm heat flux by a delocalization function, is shown to accurately describe the electron heat flow in both smooth and steep temperature gradients. This nonlocal formula for the heat flow is analytically justified. A selection of slightly different delocalization functions proposed in the literature is compared to the original one and to the results of Fokker-Planck calculations of the heat flow.

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