This work reports experimental data for the thermal resistance and junction temperature of high-performance InP/InGaAs single heterojunction bipolar transistors (SHBTs). The effects of device scaling and layer epitaxial design are investigated, and a theoretical model is developed to examine the results.

Thermal response test (TRT) is an established method to determine design parameters for borehole heat exchanger (BHE) systems; borehole thermal resistance and effective ground thermal conductivity. Most commonly, these tests are performed with heat injection, using the same assumed power level as the planned BHE system. For a thorough description of TRT and current activities around the world, ...

The authors investigate the effect of the thermal boundary resistance between the GaN layer and the substrate on the current–voltage characteristics of GaN MESFETs. Using material specific models for carrier drift-diffusion and thermal conductivity the authors determine the dependence of the breakdown voltage on thermal boundary resistance. The mechanism of the thermal breakdown in GaN transist...

We report on initial measurements of the low-temperature thermal properties of a device that is similar to the experimental apparatus used for absolute cryogenic radiometry (ACR) within the Low Background InfraRed (LBIR) facility at NIST. The device consists of a receiver cavity mechanically and thermally connected to a temperature-controlled stage through a thin-walled polyimide tube which ser...

This paper describes recent techniques developed to simplify the analysis and improve the accuracy of modeling thermal bridges. Two techniques are presented for determining the overall wall thermal resistance. The first is a hand technique using weighting factors between the isothermal planes and parallel path results. The second is a MS-WINDOWS finite-volume computer program. A technique is pr...

Analysis of the thermomechanical interactions of fusion blanket materials and physical elements, particularly those involving particle bed design concepts, have been performed. The results show that the stress caused by the high thermal expansion of the blanket particle bed material is not excessive enough to be of concern for the structural material. However, its magnitude could lead to cerami...

Currently, LED datasheets report a single figure of merit: the thermal resistance, Rth. This figure of merit is generally specified for one ill-defined operating condition and does not adequately address the intertwined relations among optical, thermal, and electrical performance requirements. Effective luminaire design requires more granularity than is currently available in conventional LED d...

MOTIVATION The hypersensitive response (HR) is a process activated by plants after microbial infection. Its main phenotypic effects are both a programmed death of the plant cells near the infection site and a reduction of the microbial proliferation. Although many resistance genes (R genes) associated to HR have been identified, very little is known about the molecular mechanisms activated afte...