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1.
Opt Lett ; 47(10): 2498-2501, 2022 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-35561384

RESUMO

Integrated silicon nitride waveguides of 100 nm height can achieve ultralow propagation losses below 0.1 dB/cm at the 1550 nm wavelength band but lack the scattering strength to form efficient grating couplers. An enhanced grating coupler design based on an amorphous silicon layer on top of silicon nitride is proposed and demonstrated to improve the directionality of the coupler. The fabrication process is optimized for a self-alignment process between the amorphous silicon and silicon nitride layers without increasing waveguide losses. Experimental coupling losses of 5 dB and a 3 dB bandwidth of 75 nm are achieved with both regular and focusing designs.

2.
Vet Hum Toxicol ; 42(1): 13-4, 2000 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-10670079

RESUMO

Natural and experimental poisonings by Cestrum laevigatum are described in goats. Histologically, livers had marked centrolobular and midzonal coagulative necrosis and hemorrhage. Spontaneous toxicosis by this plant in goats has not been previously reported.


Assuntos
Doenças das Cabras/etiologia , Intoxicação por Plantas/veterinária , Animais , Brasil/epidemiologia , Surtos de Doenças/veterinária , Feminino , Doenças das Cabras/epidemiologia , Cabras , Fígado/patologia , Intoxicação por Plantas/epidemiologia
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