Study of Heat Dissipation Mechanism in Nanoscale MOSFETs Using BDE Model

In this chapter, we report the nano-heat transport in metal-oxide-semiconductor field effect transistor (MOSFET). We propose a ballistic-diffusive model (BDE) to inquire the thermal stability of nanoscale MOSFET’s. To study the mechanism of scattering in the interface oxide-semiconductor, we have included the specularity parameter defined as the probability of reflection at boundary. In addition, we have studied the effective thermal conductivity (ETC) in nanofilms we found that ETC depend with the size of nanomaterial. The finite element method (FEM) is used to resolve the results for a 10 nm channel length. The results prove that our proposed model is close to those results obtained by the Boltzmann transport equation (BTE)

Structure cristalline de type alluaudite K0.4Na3.6Co(MoO4)3

A new triple molybdate, potassium sodium cobalt tris(molybdate), K0.4Na3.6Co(MoO4)3, was synthesized using solid-state reactions. The Co2+ and one Na+ cation are located at the same general site, each with occupancy 0.5. Another site (site symmetry 2) is occupied by Na+ and K+ cations, with occupancies of 0.597 (7) and 0.402 (6), respectively. The other two Na+ cations and one of the two Mo atoms lie on special positions (site symmetries -1, 2 and 2, respectively). The structure is characterized by M2O10 (M = Co/Na) dimers, which are linked by MoO4 tetrahedra, forming infinite layers. The latter are connected firstly by insertion of one type of MoO4 tetrahedra and secondly by sharing corners with the other type of MoO4 tetrahedra. This results in an open three-dimensional framework with the cavities occupied by the Na+ and K+ cations. The structure is isotypic with Na3In2As3O12 and Na3In2P3O12. A comparison is made with structures such as K2Co2(MoO4)3 and β-NaFe2(MoO4)3 and their differences are discussed

Structure cristalline de la triple molybdate Ag0.90Al1.06Co2.94(MoO4)5

Silver(I) aluminiun tricobalt(II) pentakis[tetraoxidomolybdate(VI)], Ag0.90Al1.06Co2.94(MoO4)5, was synthesized using a solid-state reaction at 845 K. The structure can be described as a three-dimensional framework formed from dimeric M2O10 (M = Co/Al) and trimeric M3O14 units linked to MoO4 tetrahedra by sharing corners, with the cavities occupied by disordered Ag+ cations. It is shown that the Co and Al atoms occupy common positions with different occupancies. The Ag+ cations are located at two different sites with occupancies of 0.486 (1) and 0.408 (1). The title coumpond is isotypic with NaMg3Al(MoO4)5 and NaFe4(MoO4)5. Differences and similarities with other related structures are discussed

A Hydrodynamic–Elastic Numerical Case Study of a Solar Collector with a Double Enclosure Filled with Air and Fe3O4/Water Nanofluid

This work deals with a numerical investigation of a hydrodynamic–elastic problem within the framework of a double enclosure solar collector technological configuration. The solar collector presents two enclosures separated by an elastic absorber wall. The upper enclosure is filled with air, whereas the lower one is filled with Fe3O4/water nanofluid. The mathematical model governing the thermal and flow behaviors of the considered nanofluid is elaborated. The effects of imposed hot temperatures, the Rayleigh number and air pressure on the nanofluid’s temperature contours, velocity magnitude distribution, temperature evolution, velocity magnitude evolution and Nusselt number evolutions are numerically investigated. The numerical results show and assess how the increase in the Rayleigh number affects convective heat transfer at the expense of the conductive one, as well as how much the Nusselt number and the nanofluid velocity magnitude and temperature are affected in a function of the imposed hot temperature type (uniformly or right-triangular distributed on the elastic absorber wall). Moreover, the results evaluate how increases in the air pressure applied on the elastic absorber wall affects the nanofluid’s temperature distribution

Nanotechnology and Quantum Dot Lasers

In this paper, we reviewed the recent literature on quantum dot lasers. First, we started with the physics of quantum dots. These nanostructures provide limitless opportunities to create new technologies. To understand the applications of quantum dots, we talked about the quantum confinement effect versus dimensionality and different fabrication techniques of quantum dots. Secondly, we examined the physical properties of quantum dot lasers along with the history and development of quantum dot laser technology and different kinds of quantum dot lasers compared with other types of lasers. Thirdly, we made a market search on the practical usage of quantum dot lasers. Lastly, we predicted a future for quantum dot lasers