منابع مشابه
Determination of Dielectric Constant
Introduction The dielectric constant of PCB material is important in determining the trace width required to produce a characteristic impedance of 50 ohms, or any other desired impedance. The most commonly used material, FR-4, has a dielectric constant that may vary widely between manufacturers or batches, and also varies over frequency. It is useful to have a method to determine the dielectric...
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The scaling of complementary metal oxide semiconductor (CMOS) transistors has led to the silicon dioxide layer used as a gate dielectric becoming so thin (1.4 nm) that its leakage current is too large. It is necessary to replace the SiO2 with a physically thicker layer of oxides of higher dielectric constant (κ) or ‘high K’ gate oxides such as hafnium oxide and hafnium silicate. Little was know...
متن کاملThickness and dielectric constant determination of thin dielectric layers
We derive a method for the determination of the dielectric constant and thickness of a thin dielectric layer, deposited on top of a thick dielectric layer which is in turn present on a metal film. Reflection of pand s-polarlzed light from the metal layer yields minima for certain angles of incidence where the light is absorbed by the metal. The thin dielectric layer causes shifts in the angles ...
متن کاملOn Dielectric Constant and Enzymatic Kinetics III. Interrelationships of dielectric constant and pH
The dielectric effects on trypsin and a-chymotrypsin activities have revealed that at pH 7.8 the active species of the former is the cation while that of the latter is the anion. The present study on the dielectric effects along the pH-activity curves shows that trypsin remains positive within the pH range of 5.5 to 8.5. Conversely, a-chymotrypsin is positive from pH 5.5 to 6.6, negative from 6...
متن کاملOn Dielectric Constant and Enzymatic Kinetics III. Interrelationships of dielectric constant and pH
The dielectric effects on trypsin and a-chymotrypsin activities have revealed that at pH 7.8 the active species of the former is the cation while that of the latter is the anion. The present study on the dielectric effects along the pH-activity curves shows that trypsin remains positive within the pH range of 5.5 to 8.5. Conversely, a-chymotrypsin is positive from pH 5.5 to 6.6, negative from 6...
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ژورنال
عنوان ژورنال: American Journal of Science
سال: 1901
ISSN: 0002-9599
DOI: 10.2475/ajs.s4-12.72.433