1,721,070 research outputs found
Feasibility study of material surface treatment using an atmospheric large-area glow plasma
No full textApplication of atmospheric large-area plasma of a volume of 200 x 50 x 4 mm(3) to various material surfaces was attempted for modification of surface properties. Based on the electrical and optical diagnostics, the plasma used for the treatment exhibited normal glow discharge characteristics with relatively low gas temperature, which might enable surface modification without thermal effect. Contact angle measurement showed that the plasma treatment, in general, changed surface characteristics such as wettability of paper, glass, and a silicon (Si) wafer from being hydrophobic to hydrophilic. In addition, ashing of the photoresist coated on a Si demonstrated that the measured ashing rate was found to vary depending on the plasma exposure time and the oxygen amount added to the argon supply gas. Based on the results, it is expected that the atmospheric plasma can be effectively utilized to some processes to which conventional low-pressure plasmas are employed. (c) 2005 Elsevier B.V. All rights reserved.This work was supported by KAIST and PLASMART
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Hot carrier reliability study in body-tied fin-type field effect transistors
No full textHot-carrier effects in body-tied fin-type field effect transistors (FinFETs) are investigated. As the gate bias increases, coupling effects of two gates facing each other suppress the lateral channel electric field more effectively at double gate metal oxide FETs (MOSFETs) than at single gate MOSFETs. In double gate FinFETs, this effect is even further enhanced when the fin width is narrowed. The Substrate current produced by an impact ionization process becomes large as fin width increases. In the generalized substrate Current model, the maximum substrate current bias condition is approximately V-G/V-D similar to 0.5. However, in the double-gate FinFETs, it was (V-G - V-T)/V-D similar to 0.3. There are two competing stress conditions: the maximum substrate current condition, and the maximum gate current condition. Device degradation is compared for various fin widths after both type of stress. It was found that the maximum substrate current stress condition degraded the device more significantly. The narrow fin is more immune to both stress biases than the wide fin. Thus, the narrow fin is appropriate for further device scaling and reliability. The supply voltage which corresponds to a 10-years lifetime was 1.31 V for the worst hot-carrier stress case
Control of radio-frequency atmospheric pressure argon plasma characteristics by helium gas mixing
No full textThe control of plasma characteristics is one of the important issues in many atmospheric pressure plasma applications. In order to accomplish this control, a feasibility study was performed by investigating the role of helium gas in an argon glow plasma that were produced in ambient air by 13.56 MHz radio-frequency power. Optical emission spectroscopy was used to measure rotational temperature and emission spectra acquired between 300 and 840 nm. Based on electrical and optical measurements, parameters such as gas temperature, breakdown voltage, power coupling efficiency, spatial uniformity of rotational temperature, and the sum of the emission intensity were controlled by varying the argon and helium gas mixing ratio. The addition of helium gas (from 0 to 10 lpm) to the argon flow (of 10 lpm) lowered the breakdown voltage (from 430 to 300 V-pk) and the rotational temperature (from 465 to 360 K). However, an excessive addition of helium resulted in a reduction of the spatial uniformity and efficiency of power coupling. When the ratio of helium to argon flow was between 0.3 and 0.5, a high spatial uniformity with a relatively low gas temperature and breakdown voltage was achieved. This suggests that mixing of the supply gas is a useful way of controlling the plasma characteristics that may be utilized for applications with specific required discharge conditions. (c) 2006 American Institute of Physics.KAIS
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Plasma characteristics due to helium and oxygen mixing in argon-based atmospheric plasmas
No full textVariations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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