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Svensson, Johannes,Sourab, Abdelrahim A,Tarakanov, Yury,Lee, Dong Su,Park, Seung Joo,Baek, Seung Jae,Park, Yung Woo,Campbell, Eleanor E B IOP Pub 2009 Nanotechnology Vol.20 No.17
<P>Direct measurements are presented of the Schottky barrier (SB) heights of carbon nanotube devices contacted with Pd electrodes. The SB barrier heights were determined from the activation energy of the temperature-dependent thermionic emission current in the off-state of the devices. The barrier heights generally decrease with increasing diameter of the nanotubes and they are in agreement with the values expected when assuming little or no influence of Fermi level pinning. </P>
Carbon-nanotube-based Nano Electromechanical Switches
이상욱,Anders Eriksson,Abdelrahim A. Sourab,캠벨 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
The fabrication of carbon nanotube (CNT) based nano electromechanical (NEM) switches and their electro-mechanical properties are discussed. Two different types of nano electromechanical switches, a cantilever type and a doubly-clamped type, will be introduced. The proposal of three terminal structures for the CNT-based NEM switch could lead to improvements in the stability of the switching performance. Both dc electro-mechanical properties and high-frequency measurements are used to study the switching performance. A comparison of the switching performances of both types of nano electromechanical switches is discussed at the end of the paper. The fabrication of carbon nanotube (CNT) based nano electromechanical (NEM) switches and their electro-mechanical properties are discussed. Two different types of nano electromechanical switches, a cantilever type and a doubly-clamped type, will be introduced. The proposal of three terminal structures for the CNT-based NEM switch could lead to improvements in the stability of the switching performance. Both dc electro-mechanical properties and high-frequency measurements are used to study the switching performance. A comparison of the switching performances of both types of nano electromechanical switches is discussed at the end of the paper.
Thirupathi Reddy Banda,Anil Kumar Komuravelli,Sudheer B. Balla,Bala Raju Korrai,Kavya Alluri,Jayasurya Kondapaneni,Sourab Abhyankar 대한영상치의학회 2020 Imaging Science in Dentistry Vol.50 No.3
Purpose: In India, the age of 14 years is the legal age threshold for child labour. Therefore, in suspected instances of child labour, age assessment plays a crucial role in determining whether a violation of the law on the employment of children has occurred. The aim of this retrospective cross-sectional study was to assess the discriminatory ability of stages of cervical vertebral maturation (CVM) in predicting the legal age threshold of 14 years. Materials and Methods: Routinely taken lateral cephalograms from 408 subjects aged 10 to 18 years were evaluated retrospectively using the CVM stages described by Baccetti et al. Descriptive statistics, accuracy, sensitivity, specificity, positive and negative predictive values, and likelihood ratios were calculated for stages 2, 3, and 4 of CVM. Results: Real age increased as the CVM stage gradually increased. The results of 2×2 contingency tables showed that CVM stage 4 produced an accuracy of 71% and 73%, a false positive rate of 7% and 18%, and a post-test probability of 59% and 68% for boys and girls, respectively. Conclusion: Based on these findings, it can be concluded that the stages of CVM are of limited use for predicting the attainment of the legal age threshold of 14 years. Future studies should investigate whether combinations of skeletal and dental methods could achieve better accuracy and post-test probability.