Research interest in InN has intensified in recent years because of its unique material properties and promising applications in electronic and photonic devices. Measurements on InN nanowires presented by Chang et al., [J. Electron. Mater. 35, 738 (2006)] showed an anomalous resistance behavior in InN nanowires with diameters less than 90 nm. We examine possible theories presented in literature to explain this intriguing observation. We propose that the presence of a high density electron accumulation layer at the surface of thin InN nanowires is the most probable cause for the uncharacteristic relationship between the total measured resistance and the ratio of length-to-area. High density surface electron accumulation layer, characteristic of InN films and nanowire, promotes a surface conduction path distinct from the bulk conduction. For large diameter nanowires, bulk conduction is likely to be the dominant mechanism while surface conduction is proposed to play a major role for small diameter InN nanowires.
The hotspot temperature in AlGaN/GaN heterostructure FETs has been of great interest due to its effect on the reliability of these devices. Both the nanoscale heat transfer effects and complex energy transfer mechanism from electrons to lattice are factors affecting the hotspot temperature, which is not accounted for in continuum level thermal simulations. The effects of heat generation zone size and the energy transfer mechanism from electrons to the lattice on the hotspot temperature were analyzed using electrical and nongray ballistic-diffusive thermal transport simulations for devices operated at a fixed power, but different biasing conditions. Results show that hotspot temperatures are impacted from nanoscale effects but the complex energy scattering mechanisms from electrons to the lattice do not have a significant impact on the hotspot temperature due to the scattering and redistribution of the energy within the phonon population.Index Terms-AlGaN/GaN heterostructure FETs (HFETs), electrothermal modeling, hotspot, nongray phonon transport.
The investigation was carried out in two river-estuaries of Khulna district from March 1998 to February 1999, to assess the abundance of black tiger shrimp (Penaeus monodon) post larvae IPL) and to quantify the damage to diffe-ent aquatic organisms during collection of P monodon PL. It was observed that about 384 larvae of other shrimp species, 208 fin-fish and 835 other macrozooplankton were destroyed during the collection of only one PL of P monodon. During the experimental period 0.53 million man days/ year were estimated to be involved in shrimp fry collection and on average 59.0 millionP. monodon PL were collected annually from the surveyed areas. The study implies that mass destruction of valuable aquatic organisms by shrimp seed collectors is a serious threat to biodiversity and coastal ecosystem integrity.
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