1,720,955 research outputs found
평판형 유도결합 플라즈마에서 전자 가열 및 E-H 모드 전이에 관한 연구
No full text학위논문(박사) - 한국과학기술원 : 물리학과, 2000.2, [ iii, 136 p. ]Studies on electron heating are done during the rf power coupling change in the discharge mode transition (E-H mode transition) in a planar inductive discharge of 13 MHz without electrostatic screen (Faraday shield). An inert argon gas is used as the discharge gas and the operating pressure is fixed at 5 mTorr. The variation of the plasma impedance is measured by the commercial rf high-voltage probe and the home- made Rogowski coil. Also, the evolution of the electron energy distribution function (EEDF) is observed with an rf compensated Langmuir probe and the trend of its integrals, electron density and effective electron temperature, and especially plasma potential against rf power are presented. It is demonstrated that the plasma potential is gov- erned primarily by the high-energy electron tail in a plasma with bi-Maxwellian EEDF. The interdependence of the EEDF and the plasma potential is discussed. The experimental results show that the plasma potential against rf power reflects a change in the relative contribution of capacitive power coupling to electron heating.
The study on the phenomena of the discharge mode transition from the E-mode to the H-mode in high-frequency (19 MHz) inductively coupled argon discharges is performed. Experimental observation is done at the low pressure of 10 mTorr and the high frequency of 19 MHz over a range of rf power, 40-525 W. First of all, the discharge mode transition is observed through a change of luminous intensity. On the other hand, the characteristics of the mode transition in a 6.5 MHz discharge is investigated for the purpose of the comparison with that in 19 MHz discharge. The transition in 19 MHz discharge is found to occur at the relatively high rf power of about 280 W compared with the mode transition in the 6.5 MHz discharge. Also, some distinctive features are compared to low- frequency discharges during this transition. In particular, during the E-H mode transition the apparent changes of plasma potentia...한국과학기술원 : 물리학과
A study on the characteristics of transformer coupled plasma and the geometrical effects of TCP chamber on plasma
No full text학위논문(석사) - 한국과학기술원 : 물리학과, 1995.2, [ iii, 79 p. ]한국과학기술원 : 물리학과
Gas supply enhancement using the shower head through the electrical insulator
No full textDisclose a kind of plasma producing apparatus i.e. substrate board treatment.Described plasma producing apparatus includes: be arranged on multiple earth electrodes that vacuum tank is internal and extends parallel to one another；And the power electrode being arranged between earth electrode.There are the region of constant distance between earth electrode and power electrode, power electrode is being tapered on the direction of substrate.Power electrode is connected to RF power source, and on the direction of substrate, the height of power electrode is more than the height of earth electrode
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“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
Get PDFWe 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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