We derive an analytical solution to the Boltzmann transport equation (BTE) to relate nondiffusive thermal conductivity measurements by thermoreflectance techniques to the bulk thermal conductivity accumulation function, which quantifies cumulative contributions to thermal conductivity from different mean free path energy carriers (here, phonons). Our solution incorporates two experimentally def...

Abstract: In the last few years, due to the development of the new equipment in power systems, challenges have appeared in their planning and operation. One of these issues is the development of combined heat and power (CHP) units. These units have the capability to generate heat and electricity simultaneously according to their limitations. Hence, it is necessary for them to think about the ar...

We study the effect of confinement on the phonon properties of ultra-narrow silicon nanowires of side sizes of 1 nm to 10 nm. We use the modified valence force field (MVFF) method to compute the phononic dispersion and extract the density of states, the transmission function, the sound velocity, the ballistic thermal conductance, and boundary-scattering-limited diffusive thermal conductivity. W...

The thermal properties, including thermal time constants, of GaInN light-emitting diodes LEDs and laser diodes LDs are analyzed. The thermal properties of unpackaged LED chips are described by a single time constant, that is, the thermal time constant associated with the substrate. For unpackaged LD chips, we introduce a heat-spreading volume. The thermal properties of unpackaged LD chips are d...

In direct combustion-thermoelectric energy conversion, direct fuel injection and reciprocation of the air flowing in a solid matrix are combined with the solid-gas interfacial heat transfer and the solid conduction to allow for obtaining superadiabatic temperatures at the hot junctions. While the solid conductivity is necessary, the relatively large thermal conductivity of the available high-te...

High-threshold primary afferent units were selected from the population of axons functionally isolated in fine filaments dissected from the median and ulnar nerves of macaque monkeys. In 47 experiments, 536 such units were studied. They comprised 345 A-delta and 191 C fiber units; 90 low-threshold mechanoreceptive afferents were also studied for comparison. The high-threshold units were categor...

General models for workload input into service systems are considered. Scaling limit theorems appropriate for the formulation of fluid and heavy traffic approximations for systems driven by these inputs are given. Under appropriate assumptions, it is shown that fractional Brownian motion can be obtained as the limiting workload input process. Motivation for these results comes from data on comm...

Maintenance scheduling of generating units is considered one of the vital power system problem for providing power in a reliable and economic way. In order to improve the overall availability of the generating units, chances of capacity shortage is to be reduced by performing preventive maintenance at regular intervals. In this paper, Hybrid integer coded Water Wave Optimization (HWWO) Algorith...