منابع مشابه
Brightening the dark excitons
Optical properties of semiconductors are dominated by excitons, which are electron –hole pairs bound by Coulomb interactions. Excitons can be bright or dark depending on the spin orientation of the individual carriers. In a bright exciton the electron and the hole have antiparallel spins and can recombine easily through the emission of a photon. In a dark exciton the spins are parallel and the ...
متن کاملMarine cloud brightening
The idea behind the marine cloud-brightening (MCB) geoengineering technique is that seeding marine stratocumulus clouds with copious quantities of roughly monodisperse sub-micrometre sea water particles might significantly enhance the cloud droplet number concentration, and thereby the cloud albedo and possibly longevity. This would produce a cooling, which general circulation model (GCM) compu...
متن کاملExplorer Marine Cloud Brightening
Citation for published version: Stevenson, T, Latham, J, Bower, K, Choularton, T, Coe, H, Connolly, P, Cooper, G, Craft, T, Foster, J, Gadian, A, Galbraith, L, Iacovides, H, Johnston, D, Launder, B, Leslie, B, Meyer, J, Neukermans, A, Ormond, B, Parkes, B, Rasch, PJ, Rush, J, Salter, S, Wang, H, Wang, Q & Wood, R 2012, 'Marine Cloud Brightening' Philosophical Transactions A: Mathematical, Physi...
متن کاملOpen-label evaluation of the skin-brightening efficacy of a skin-brightening system using decapeptide-12.
This prospective study evaluated the safety and efficacy of decapeptide-12 in conjunction with an antioxidant cleanser, glycolic-acid containing facial moisturizer and broad-spectrum sunscreen in the treatment of facial hyperpigmentation associated with chronic photodamage. Fifteen female subjects with Fitzpatrick skin types I through IV and documented photodamage were entered into the study, o...
متن کاملMechanisms of the dimming and brightening aftereffects.
Dimming and brightening aftereffects occur after exposure to a temporal luminance sawtooth stimulus: A subsequently presented steady test field appears to become progressively dimmer or brighter, depending on the polarity of the adapting sawtooth. Although described as "dimming" and "brightening," it is plausible that a component of the aftereffects is based on contrast changes rather than on l...
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ژورنال
عنوان ژورنال: Sociological Methodology
سال: 2012
ISSN: 0081-1750,1467-9531
DOI: 10.1177/0081175012460864