Ideality
Mostrando 13-24 de 25 artigos, teses e dissertações.
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13. Electrical characterization of PbTe p-n junctions for applicarion in infrared detectors. / Caracterização elétrica de junções p-n de PbTe para aplicação em detectores de infravermelho.
This work reports on the electrical characterization of PbTe p-n junctions for application in photovoltaic detectors in the medium infrared range. For this purpose, a series of p-n junctions, where the hole concentration p was kept at 1017 cm-3 and the electron concentration n varied between 1017 and 1019 cm-3, was successfully grown by molecular beam epitax
Publicado em: 2004
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14. Estudo de processo de fabricação de diodo Schottky de potencia
This work is a study of fabrication process for power Schottky diode. Aluminum and Tungsten were used as metal Schottky contact. The types of fabricated Schottky diodes were: Convencional Schottky diode, with metal overlap, with p-n guard ring and with pn junction grid. Parameters from IxV and transient curves were extracted to verify the static and dinamic
Publicado em: 2003
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15. A THERMODYNAMIC MODEL TO PREDICT WAX FORMATION IN PETROLEUM FLUIDS
Some years ago the authors proposed a model for the non-ideality of the solid phase, based on the Predictive Local Composition concept. This was first applied to the Wilson equation and latter extended to NRTL and UNIQUAC models. Predictive UNIQUAC proved to be extraordinarily successful in predicting the behaviour of both model and real hydrocarbon fluids a
Brazilian Journal of Chemical Engineering. Publicado em: 2001-12
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16. Filmes finos de WN e ALN e suas aplicações na fabricação de transitores mesfet
Tungsten Nitride (WN) and Aluminum Nitride (AlN) thin films were deposited by DC sputtering in Nitrogen ambi~nt and characterized in this work. Gallium Arsenide Schottky diodes were used in the characterization of WN films. The diodes were subject to thermal treatments to study the thermal stability of the contacts, as in the fabrication process of MESFET tr
Publicado em: 2000
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17. Caracterização termodinamica de sistemas ternarios para escolha de processos de separação
The objective of this work is to develop a methodology for studing the vapor-(liquid)-liquid phase behaviour of ternary systems and for rapidly determining the partial miscibility presence by using the commercial simulator PROII. The methodology uses flash simulation to do liquid-(liquid)-vapor equilibrium calculations simulation results are used to generate
Publicado em: 1995
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18. Modelamento de transistores bipolares de heterojunção
A study about current transport mechanism through a heterojunction is presented. Drift and diffusion mechanism are not enough to describe the electrical current (due to a spike in the conduction band of the Npn transistor). This has led to the introduction of the Thermionic-Emission mechanism. The Ebers-Moll and Gummel-Poon models are also compatible with th
Publicado em: 1995
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19. Precipitação de parafina em misturas de petroleo : medidas experimentais e modelagem termodinamica
The appearance and development of a solid-phase in the liquid solution of a petroleum fluid can occur when it is subjected to low temperatures. The solid phase - formed by high molecular wheight components - may cause serious operational problems that can even lead to an interruption of the mixture production. Hence, it is important to predict the way it hap
Publicado em: 1994
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20. The Refined Three-Dimensional Structure of Pectate Lyase C from Erwinia chrysanthemi at 2.2 Angstrom Resolution (Implications for an Enzymatic Mechanism).
The crystal structure of pectate lyase C (EC 4.2.2.2) from the enterobacterium Erwinia chrysanthemi (PelC) has been refined by molecular dynamics techniques to a resolution of 2.2 A to an R factor of 17.97%. The final model consists of 352 of the total 353 amino acids and 114 solvent molecules. The root-mean-square deviation from ideality is 0.009 A for bond
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21. The Refined Three-Dimensional Structure of Pectate Lyase E from Erwinia chrysanthemi at 2.2 A Resolution.
The crystal structure of pectate lyase E (PelE; EC 4.2.2.2) from the enterobacteria Erwinia chrysanthemi has been refined by molecular dynamics techniques to a resolution of 2.2 A and an R factor (an agreement factor between observed structure factor amplitudes) of 16.1%. The final model consists of all 355 amino acids and 157 water molecules. The root-mean-
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22. Crystal structure of bovine procarboxypeptidase A-S6 subunit III, a highly structured truncated zymogen E.
Subunit III, a defective serine endopeptidase lacking the typical N-terminal hydrophobic dipeptide is secreted by the pancreas of ruminant species as part of the bovine ternary complex procarboxypeptidase A-S6. Two monoclinic crystal forms were obtained and subsequently used to solve its X-ray structure. The highest resolution model of subunit III was refine
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23. Crystal structure of human immunodeficiency virus (HIV) type 2 protease in complex with a reduced amide inhibitor and comparison with HIV-1 protease structures.
The crystal structure of HIV-2 protease in complex with a reduced amide inhibitor [BI-LA-398; Phe-Val-Phe-psi (CH2NH)-Leu-Glu-Ile-amide] has been determined at 2.2-A resolution and refined to a crystallographic R factor of 17.6%. The rms deviation from ideality in bond lengths is 0.018 A and in bond angles is 2.8 degrees. The largest structural differences b
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24. Topology of gel-phase domains and lipid mixing properties in phase-separated two-component phosphatidylcholine bilayers.
The influence of the lipid mixing properties on the lateral organization in a two-component, two-phase phosphatidylcholine bilayer was investigated using both an experimental (fluorescence recovery after photobleaching (FRAP)) and a simulated (Monte Carlo) approach. With the FRAP technique, we have examined binary mixtures of 1-stearoyl-2-capryl-phosphatidyl