scholarly journals Thermal Constraints for Heterostructure Barrier Varactors

2004 ◽  
Vol 25 (11) ◽  
pp. 713-715 ◽  
Author(s):  
M. Ingvarson ◽  
B. Alderman ◽  
A.O. Olsen ◽  
J. Vukusic ◽  
J. Stake
Keyword(s):  
Thermal Constraints ◽  
Heterostructure Barrier Varactors

Thermal constraints on basin-scale flow systems

1991 ◽  
Vol 18 (5) ◽  
pp. 967-970 ◽  
Author(s):  
Jeffrey A. Nunn ◽  
David Deming
Keyword(s):  
Thermal Constraints ◽  
Basin Scale ◽  
Flow Systems

Computational Evolution of Optimal Iceform Shapes Over a Flat Plate

1991 ◽  
Author(s):  
Ronald S. LaFleur
Keyword(s):  
Energy Dissipation ◽  
Flat Plate ◽  
Thermal Field ◽  
Fluid Dynamic ◽  
Minimum Energy ◽  
Thermal Parameter ◽  
Thermal Constraints ◽  
Ice Water ◽  
Nonlinear Geometric ◽  
Minimum Energy Dissipation

Abstract This paper presents the computational evolution of minimum energy dissipation iceform contours. The ice/water interface is shaped according to fluid dynamic and heat transfer characteristics of the flow field near the interface. A Couette iceform design model is used to approximate flow and thermal field behavior near the interface. The theory used to calculate the interface shape is based on a wedge model of the ice contour over a cold flat plate. The steady state ice profile is calculated when Reynolds number and the thermal parameter are selected. The generation function, designation function and energy dissipation are related to the nonlinear geometric development. An optimal preprocess criterion is prescribed as zero evolution length. The result is optimal geometries that are adapted to the flow and thermal constraints.

Effects of Clamping on the Laser Forming Process

2006 ◽  
Vol 129 (6) ◽  
pp. 1035-1044 ◽  
Author(s):  
A. J. Birnbaum ◽  
P. Cheng ◽  
Y. L. Yao
Keyword(s):  
Thermal Field ◽  
Laser Forming ◽  
Considerable Effort ◽  
Forming Process ◽  
Thermal Problem ◽  
Bending Angle ◽  
Mechanical Constraints ◽  
Thermal Constraints ◽  
Close Proximity ◽  
Multiple Scan

Although considerable effort has gone into characterizing the laser forming process in terms of process parameters and conditions, there has been little emphasis on the effects of the mechanical and thermal constraints introduced by the clamping method utilized for a desired application. This research suggests means for investigating and predicting the resulting geometry of a specimen due to laser operation in close proximity to an array of imposed thermo-mechanical constraints for both the single and multiple scan cases; specifically, the resulting average bending angle as well as bending angle variations throughout the part. This is accomplished by initially only considering these effects on the thermal field. Conclusions are then drawn about the nature of the mechanical effects. These conclusions are validated through numerical simulation as well as physical experimentation. An analytical solution of the thermal problem is also presented for further validation of the temperature field as a constrained edge is approached.

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