The key idea in this work is modifying the depletion region in the channel for improving the electrical performances. The proposed structure consists of upper and lower gates. Also, the lower gate is divided into a number (N) of smaller step-shaped sections. Therefore, we have called the proposed structure multiple-recessed 4H-SiC MESFET (MR-MESFET). DC and RF characteristics of the MR-MESFET structure with various lower gate segments are analyzed by 2D numerical simulation. The simulated results show that as the number of the lower gate sections increases, the channel AL3818 depletion region is modified

and the drain current (I-D) enhances. Also, by increasing the number of the lower gate sections, the breakdown voltage (V-BR) enhances, too. Improvement of the I-D and VBR leads to a further increase in the output power density of the device. Also, cut-off frequency (f(T)), maximum oscillation frequency (f(max)). and maximum available gain (MAG) improvements

CCI-779 molecular weight are achieved for the MR-MESFET structure with further number of the lower gate sections. The results show that the MR-MESFET structure with higher number of the lower gate segments has superior electrical characteristics and performances in comparison with the MR-MESFET structure with fewer number of the lower gate sections. (C) 2011 Elsevier B.V. All rights reserved.”
“Objective: Researchers in many fields are interested in the robust observation that

higher socioeconomic status (SES) is associated with better mental and physical health. Prominent explanations for the association involve effects of stress due to relative material and social selleck screening library adversity in lower socioeconomic environments, but early-life intelligence may also contribute directly to both later-life socioeconomic status and health. Here, we evaluated the effects of early-life IQ on mental and physical health outcomes at age 70, in the context of effects of SES. Design: The Lothian Birth Cohort of 1936 took part in the Scottish Mental Survey of 1947, providing a measure of IQ at age 11. They have been extensively surveyed at age 70. Main Outcome Measures: Body mass index, constraints on daily life activities, hospital anxiety and depression, number of diseases, level of physical activity, weekly units of alcohol consumption, and pack-years of smoking. Results and Conclusion: SES had apparently direct effects on most outcomes, but age 11 IQ was also involved in several, either directly or because it contributed to SES. Several interactions helped to integrate these associations. High age-11 IQ tended to buffer effects of adverse environments on physical and mental problems in old age.