Showing papers in "Superlattices and Microstructures in 2004"

TL;DR: In this article, the authors considered the forced convection flow of water and ethylene glycol inside a uniformly heated tube that is submitted to a constant and uniform heat flux at the wall.

TL;DR: In this article, the hydrodynamic and thermal fields of a water-γAl2O3 nanofluid in a radial laminar flow cooling system were considered, and it was shown that considerable heat transfer enhancement is possible, even achieving a twofold increase in the case of a 10% nanoparticle volume fraction.

TL;DR: In this paper, the role of the Knudsen number and the cross-section aspect ratio in the friction factor reduction due to rarefaction was investigated for an incompressible flow through silicon microchannels with rectangular, trapezoidal or double-trapezoidal cross-sections.

TL;DR: In this paper, surface roughness is modeled through a set of random generated peaks along the ideal smooth surface and different peak shapes and distributions are considered; geometrical parameters are representative of tubes in the diameter range from 50 to 150μm.

TL;DR: In this article, a modified on-demand ink jet process is used to print electrically conducting line patterns from a suspension of gold nanoparticles in toluene, and focused laser irradiation is utilized in order to evaporate the solvent, melt the metal nanoparticles, and sinter the suspended particles to form continuous, electricallyconducting gold microlines on a substrate.

TL;DR: In this article, the combined effects of in situ SiNx masking of the sapphire substrate and starting the epitaxial growth at low V-to-III ratio on the GaN film quality were studied by atomic force microscopy, transmission electron microscopy and high-resolution X-ray diffraction.

TL;DR: In this article, a patterned growth of vertically aligned ZnO nanowire arrays on the micrometer and nanometer scale on sapphire and GaN epilayers is reported.

TL;DR: In this paper, a Cahn-Hilliard evolution equation was employed to study the morphological evolution of a strained heteroepitaxial thin film, during continuous mass deposition, on a substrate with an embedded coherent island.

TL;DR: In this paper, a (11 2 0 ) a -plane InN film grown by molecular beam epitaxy on ( 1 1 02 ) r -plane sapphire substrate with an AlN nucleation layer and a GaN buffer was studied by spectroscopic ellipsometry.

TL;DR: In this article, an efficient methodology for solving internal flows of binary gaseous mixtures in rectangular channels due to small pressure gradients over the whole range of the Knudsen number is proposed.

TL;DR: In this paper, it was shown that a high oxygen partial pressure enhances both the nucleation probability and the growth rate of the nanowires, while the effect of the water vapor is mainly to assist their nucleation.

TL;DR: In this paper, the optical and nanomechanical properties of a polycarbonate (PC) based optical lens and an anti-scratch (AS) coating as a protective overcoat were investigated.

TL;DR: In this article, the authors discuss some of the nanoscale heat transfer effects on phonon and photon transport and their implications for thermoelectric and thermophotovoltaic energy conversion technologies.

TL;DR: In this article, an analytical expression for the thermal conductivity in nanostructures is presented, which takes into account all phonon properties: the number of modes, the group velocity, the relaxation time due to the Umklapp process and the boundary surface scattering and their variation with the wave vector directions.

TL;DR: In this article, the laser-dressed quantum well potentials for both conduction and valence band were derived in the frame of nonperturbative theory and variational approach, and a significant blue shift was obtained for the interband recombination energy and quantum well fundamental absorption edge, when an intense, non-resonant laser field radiation, is applied.

TL;DR: The thermal stability of 1-decanethiol and benzenethiol self-assembled monolayers (SAMs) on metallic and oxidized copper surfaces has been investigated by thermal desorption spectrometry.

TL;DR: In this article, the accurate temperature detection in the micro-scale by different measurement methods for the deduction of steady state and transient thermal properties from the results was investigated by application of a simplified thermal equivalent circuit model.

TL;DR: In this paper, an ultra-high convective heat transfer performance compared to the well-known heat transfer correlations caused by a nano-particle porous surface was discovered, where the maximum increase of heat transfer coefficient was around 180%.

TL;DR: In this article, a cylindrically shaped microstructure for nucleate boiling was developed, combining electrocoating and etching processes, and the results obtained show the heat flux to remain independent of the wall superheat in the fully developed boiling region.

TL;DR: In this paper, the effect of gravity on condensation flow patterns is highlighted and the experimental results on flow structures are compared with the descriptions and characteristics found in the literature, and flow laws are established thanks to the measurement of pressure drops.

TL;DR: In this paper, a thermal model and experimental results from the calibration procedure are presented to study the thermal behavior of stand-alone probes, and several geometric and thermal parameters are deduced from the comparison.

TL;DR: In this paper, the nucleation of In-face InN films on GaN(0001) surfaces by plasma-assisted molecular beam epitaxy was investigated, and it was shown that InN islands that grow with large height to width aspect ratios are observed.

TL;DR: In this paper, Fourier transform infrared (FTIR) spectroscopy with the attenuated total reflection (ATR) method, contact angle measurements, scanning force microscopy (SFM), and thermal desorption (TDS) was used to characterize trimethylsilyl and pentamethyldisilyl (TMS) terminated surfaces.

TL;DR: In this article, the authors give a theoretical description of and experimental results on the thermal probe frequency response, and determine its time constant and the calibration factor, and identify two operation modes (isothermal and adiabatic) separated by a crossover frequency and discuss the conditions for maximum sensitivity to sample thermal properties.

TL;DR: In this article, three different new detector concepts have been investigated and the dependences of the detector efficiency on pore depth and on the coating of the pore walls are presented.

TL;DR: In this article, the indium nitride layers were grown on different types of buffer layers such as Ga polar GaNs, N polar GaN, low temperature AlN and nitrided sapphire.

TL;DR: In this article, a GaN epilayers grown by metal organic chemical vapor deposition (MOCVD) were implanted with Tm and Eu ions with different energies and fluences and at different temperatures in order to optimize the implantation conditions.

TL;DR: In this article, the characterization and fabrication of Schottky barrier photodiodes based on InGaN/GaN multiple-quantum well structures in the active region are presented.