Charge Injection
Mostrando 13-24 de 47 artigos, teses e dissertações.
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13. DESENVOLVIMENTO E VALIDAÇÃO DE MÉTODOS PARA DETERMINAÇÃO DE TACROLIMUS EM CÁPSULAS / DEVELOPMENT AND VALIDATION OF METHODS FOR DETERMINATION OF TACROLIMUS IN CAPSULES
Tacrolimus is a lactone macrolide, derived from Streptomyces tsukubaensis. It is an immunosuppressive drug that has been used in the prevention of organs transplant rejection, such as liver, kidney, heart, small intestine, pancreas and bone marron. The drug is also indicated for the treatment of atopic dermatitis, eczema, psoriasis and vitiligo. It is availa
Publicado em: 2007
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14. InjeÃÃo e transporte de portadores em dispositivos optoeletrÃnicos orgÃnicos e inorgÃnicos / Injection and transport of charge carriers in organic and inorganic optoelectronic devices
Os semicondutores orgÃnicos surgem como alternativa promissora aos materiais inorgÃnicos na tecnologia de fabricaÃÃo de monitores de vÃdeo, viabilizando aplicaÃÃes inovadoras. Vantagens tais como leveza, flexibilidade mecÃnica, variedade de cores e fÃcil processabilidade para produÃÃo em larga escala fizeram com que as telas orgÃnicas conquistass
Publicado em: 2005
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15. Positive charge transport in an alternating oligo-p-phenylenevinylene-derivative/aliphatic-segment block copolymer
An effective positive charge carrier mobility of 4.4 x 10 -9 cm²/V.s was directly determined using analytical expressions for space-charge-limited current in poly(1,10-decanedioxy-2-methoxy-1,4-phenylene-1,2-ethenylene-3,6-dimethoxy- 1,4-phenylene-1,2-ethenylene-3-methoxy-1,4-phenylene), OPPVDBC, which is a soluble electroluminescent alternating block copol
Materials Research. Publicado em: 2001
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16. Técnica do Pulso Eletroacústico para medidas de Perfis de Carga Espacial em Dielétricos / Electro-acoustic Pulse to Measure Space Charge Profile in Dielectric Materials
It is described the implementation of the electroacustic pulse technique, PEA, for the determination of space charge profiles in dielectrics. The method is based on the acoustic signal generated by the application of a voltage pulse with short duration on the sample. The acoustic signal generated by pulse is detected by using a piezoelectric transducer coupl
Publicado em: 1999
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17. Espectroscopia optica em super-redes de GaAs com dopagem delta de Si
We performed the GaAs Si delta doped superlattices optical characterization, using spectroscopic techniques as photoluminescence, photoluminescence sxcitation, time resolved photoluminescence, Raman scattering and time resolved photorefletance. Their electronic structure is such that the electron gas is confined in minibands along the growth direction and pr
Publicado em: 1997
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18. Resolução numérica de equações de transporte de cargas elétricas através de isolantes / Numerical solutions of equations describing electric charge transport through insulating materials
Numeral methods for solving partial differential equations of the hiperbolic type, governing some problems of transport of electric charge in dielectrics are presented and then applied to four specific problems: injection of charge via an ohmic contact into a sample with a constant applied voltage; transport of a pulse of charge through a sample in the open
Publicado em: 1988
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19. Study of the transport and storage properties of electric charges in Teflon FEP films. / Estudo das propriedades de transporte e armazenamento de cargas elétricas em filmes de Teflon FEP.
The Heat Pulse and TSC (Thermo-Stimulated-Current) in open circuit techniques were used to study the transport and storage of injected charge in Teflon FEP films. Using these techniques it was possible to follow the evolution of the injected charge inside the samples. Virgin samples (as received), previously annealed samples and previously ionic bombarded sa
Publicado em: 1986
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20. Charge transport in FEP Teflon Films submsted to corona discharge in air and in nitrogen. / Estudo do transporte de carga em amostras de teflon FEP sob descarga corona no ar e no nitrogênio.
The corona triode with constant current was used to measure the evolution of surface potential of FEP 12 and 25 μm samples, charged with positive and negative corona in air and in nitrogen. No difference in the transport properties in thin samples was observed when the gas was changed and this allowed us to conclude that electrons and holes are the carri
Publicado em: 1984
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21. The effects of polycations on vascular permeability in the rat. A proposed role for charge sites.
This study investigated whether charge sites in the walls of the microvasculature may play a role in maintaining the impermeability of the nonrenal capillaries to albumin. All experiments were performed in nephrectomized rats, studied in the awake state. The intravenous injection of protamine sulfate (4 mg/100 g body wt dissolved in 0.9% saline) was followed
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22. Charge transfer and transport in DNA
We explore charge migration in DNA, advancing two distinct mechanisms of charge separation in a donor (d)–bridge ({Bj})–acceptor (a) system, where {Bj} = B1,B2, … , BN are the N-specific adjacent bases of B-DNA: (i) two-center unistep superexchange induced charge transfer, d*{Bj}a → d∓{Bj}a±, and (ii) multistep charge transport involves charge i
The National Academy of Sciences.
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23. Femtosecond direct observation of charge transfer between bases in DNA
Charge transfer in supramolecular assemblies of DNA is unique because of the notion that the π-stacked bases within the duplex may mediate the transport, possibly leading to damage and/or repair. The phenomenon of transport through π-stacked arrays over a long distance has an analogy to conduction in molecular electronics, but the mechanism still need
The National Academy of Sciences.
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24. Electric double layer dynamics by high-field electroluminescence in aqueous solution (Destriau effect)†
Transient luminescence induced by high electric fields (>2.5 × 104 V/cm) was observed in aqueous solutions of 6,8-dihydroxypyrene-1,3-disulfonic acid. The light emission takes place both at the leading and the trailing edges of the perturbing electric square pulse. It occurs only during the variation of the applied field and disappears with a time constant