We demonstrate highly broad-band frequency conversion via four-wave mixing in silicon nanowaveguides. Through appropriate engineering of the waveguide dimensions, conversion bandwidths greater than 150 nm are achieved and peak conversion efficiencies of -9.6 dB are demonstrated. Furthermore, utilizing fourth-order dispersion, wave-length conversion across four telecommunication bands from 1477 ...

nowadays, energy plays an important role in the economic and community development of country. consequently, performance analysis of energy systems is one of the effective methods being used to prevent waste of energy resources. among the different power generation technologies, steam power plants make a significant contribution to power generation in iran, with a share of 47 % of electricity g...

High-efficiency multijunction laser power converters are demonstrated for low temperature applications with an optical input at 808 nm. The photovoltaic converting III-V semiconductor devices designed GaAs absorbing layers, here 5 thin subcells (PT5), connected by transparent tunnel junctions. Unprecedented conversion efficiencies of up to 74.7% measured temperatures around 150 K. At 77 K, a re...

In this paper, we demonstrated that platinum (Pt) counter electrodes (CEs) fabricated using electrochemical deposition and chemical reduction can replace conventional high-temperature thermally decomposed Pt electrodes. In this study, Pt electrodes were fabricated using thermal decomposition, electrochemical deposition, and chemical reduction, and the influence of the different Pt counter elect...

Title of Document: A SUNLIGHT TO MICROWAVE POWER TRANSMISSION MODULE PROTOTYPE FOR SPACE SOLAR POWER Paul Iven Jaffe, Doctor of Philosophy, 2013 Directed By: Professor Victor L. Granatstein, Department of Electrical and Computer Engineering The prospect of effectively limitless, continuous electricity from orbiting satellites for use on earth has captured many people’s interest for decades. The...

The biological production of hydrogen from the fermentation of different substrates was examined in batch tests using heat-shocked mixed cultures with two techniques: an intermittent pressure release method (Owen method) and a continuous gas release method using a bubble measurement device (respirometric method). Under otherwise identical conditions, the respirometric method resulted in the pro...

Abstract An integrated receiver storage for a beam-down concentrating solar power (CSP) plant enables simplifying the system layout and reducing costs. Here two-layer (TLIRS) design is proposed consisting of cavity packed-bed storage. The first layer porous ceramic second one rocks. To enable performance optimization system, models radiation, two-phase transient heat transfer local thermal none...

Organic Photovoltaics In article number 2300249, Antoine Bousquet, Natalie P. Holmes, Sylvain Chambon, and co-workers achieve power conversion efficiencies approaching 10% by careful control of the nanoparticle thin film morphologies thanks to surface energies considerations. This approach opens route low environmental footprint photovoltaics. Representing a promise this sustainable direction i...

Two covalently linked triisopropylsilyl-ethynylated phenazinothiadiazoles were prepared through condensation of a spirocyclic and bicyclic tetraketone with 5,6-diaminobenzothiadiazole. The spirobisindene- the ethanoanthracene-based linkers render electron acceptors amorphous in thin films. optoelectronic properties non-conjugated dimers are indistinguishable from that crystalline monomer. Bulk ...