Suppression of photorefractive damage with aid of steady-state temperature gradient in nominally pure LiNbO3 crystals

2008 ◽  
Vol 104 (11) ◽  
pp. 114104 ◽  
Author(s):  
S. M. Kostritskii ◽  
O. G. Sevostyanov ◽  
M. Aillerie ◽  
P. Bourson
Keyword(s):  
Steady State ◽  
Temperature Gradient ◽  
Steady State Temperature

Temperature Gradients in Skirt Supports of Hot Vessels

1963 ◽  
Vol 85 (2) ◽  
pp. 219-223 ◽  
Author(s):  
D. J. Bergman
Keyword(s):  
Steady State ◽  
Temperature Gradient ◽  
Temperature Curve ◽  
Neutral Axis ◽  
Temperature Gradients ◽  
Radius Of Curvature ◽  
Maximum Gradient ◽  
Axial Tension ◽  
Steady State Temperature ◽  
Tension And Compression

A discussion of the variables involved in the temperature gradient along a skirt support for a hot vessel is presented. A method is presented for reasonably approximating the maximum gradient since the temperature curve is rarely linear. For guidance in applying the formula and to illustrate the effect of some of the variables, several basic cases are calculated, using three different skirt support thicknesses and considering bare, fireproofed, and insulated types of skirts. Having a formula for a steady-state temperature along the length of a skirt, it is possible by means of mathematical manipulations to obtain the value of the radius of curvature of the neutral axis at any point. Using this, it is then possible to calculate the axial tension and compression stresses on the inside and outside of a free skirt wall.

scholarly journals Spatial temperature mapping within polymer nanocomposites undergoing ultrafast photothermal heating via gold nanorods

Nanoscale ◽  
2014 ◽  
Vol 6 (24) ◽  
pp. 15236-15247 ◽  
Author(s):  
Somsubhra Maity ◽  
Wei-Chen Wu ◽  
Chao Xu ◽  
Joseph B. Tracy ◽  
Kenan Gundogdu ◽  
...  
Keyword(s):  
Steady State ◽  
Temperature Gradient ◽  
Polymer Nanocomposites ◽  
Gold Nanorods ◽  
Direct Detection ◽  
Polymer Melt ◽  
Polarized Fluorescence ◽  
Temperature Mapping ◽  
Photothermal Heating ◽  
Steady State Temperature

Polarized fluorescence temperature measurements combined with direct detection of nanorod rotation within the polymer melt regions reveal the steady-state temperature gradient on the nanoscale.

scholarly journals Issues of conventional model of transfer of latent heat in soil

2017 ◽  
Vol 31 (2) ◽  
pp. 303-306
Author(s):  
Iwao Sakaguchi ◽  
Hidetoshi Mochizuki ◽  
Arata Katayama ◽  
Toshihiko Momose ◽  
Haruyuki Fujimaki
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Temperature Gradient ◽  
Latent Heat ◽  
Conventional Model ◽  
Solute Content ◽  
Steady State Condition ◽  
Steady State Temperature ◽  
Vapour Flux ◽  
Temperature Water

Abstract Upper limit of experimental coefficient between the measured transfer of latent heat and the estimated vapour flux in the frame of the conventional model of latent heat transfer in soil was examined by analysing the measured latent heat transfer and temperature gradient in soil under steady-state temperature gradient. To exclude the temperature gradient as an uncertainty factor from the experimental coefficient, the temperature gradients of overall soil and soil pore were included into the vapour fluxes in the atmosphere. The estimated experimental coefficient did not exceed unity, which indicated that both the latent heat transfer and the vapour fluxes in the soil were smaller than those in the atmosphere. The gap that appeared between the experimental coefficient and the product of the tortuosity factor and air-filled porosity implied the existence of an unidentified parameter relevant to characteristic of the circulation of water in soil which is the main mechanism of latent heat transfer in soil. By quantifying this characteristic with simultaneous measurements of the latent heat transfer, distributions of temperature, water content and solute content in various soils under the steady-state condition, the conventional model would be modified, or an alternative model being independent of the conventional model would be developed.

Synthesis of chalcogenide and pnictide crystals in salt melts using a steady-state temperature gradient

2016 ◽  
Vol 61 (4) ◽  
pp. 682-691 ◽  
Author(s):  
D. A. Chareev ◽  
O. S. Volkova ◽  
N. V. Geringer ◽  
A. V. Koshelev ◽  
A. N. Nekrasov ◽  
...  
Keyword(s):  
Steady State ◽  
Temperature Gradient ◽  
Salt Melts ◽  
Steady State Temperature

scholarly journals Identification of DC Thermal Steady-State Differential Inductance of Ferrite Power Inductors

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3854
Author(s):  
Salvatore Musumeci ◽  
Luigi Solimene ◽  
Carlo Stefano Ragusa
Keyword(s):  
Steady State ◽  
Input Voltage ◽  
Switching Frequency ◽  
Ohmic Losses ◽  
Steady State Temperature ◽  
Wide Range ◽  
Average Current ◽  
Power Inductors ◽  
Saturable Inductor ◽  
Thermal Steady State

In this paper, we propose a method for the identification of the differential inductance of saturable ferrite inductors adopted in DC–DC converters, considering the influence of the operating temperature. The inductor temperature rise is caused mainly by its losses, neglecting the heating contribution by the other components forming the converter layout. When the ohmic losses caused by the average current represent the principal portion of the inductor power losses, the steady-state temperature of the component can be related to the average current value. Under this assumption, usual for saturable inductors in DC–DC converters, the presented experimental setup and characterization method allow identifying a DC thermal steady-state differential inductance profile of a ferrite inductor. The curve is obtained from experimental measurements of the inductor voltage and current waveforms, at different average current values, that lead the component to operate from the linear region of the magnetization curve up to the saturation. The obtained inductance profile can be adopted to simulate the current waveform of a saturable inductor in a DC–DC converter, providing accurate results under a wide range of switching frequency, input voltage, duty cycle, and output current values.

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