1,720,995 research outputs found
Study on growth morphology, microstructure, and magnetic properties of FePt/Pt alloy thin films
No full text학위논문(박사) - 한국과학기술원 : 물리학과, 2002.2, [ iv, 101, [4] p. ]한국과학기술원 : 물리학과
Designing and fabricating a highly sensitive and accurate vibrating sample magnetometer by the study of the detection coil array and the vibrator
No full text학위논문(석사) - 한국과학기술원 : 물리학과, 1996.2, [ [iv], 80 p. ]한국과학기술원 : 물리학과
Linear stability of two-dimensional steady flow in wavy-walled channels
No full textLinear stability of fully developed two-dimensional periodic steady flows in sinusoidal wavy-walled channels is investigated numerically. Two types of channels are considered: the geometry of wavy walls is identical and the location of the crest of the lower and upper walls coincides (symmetric channel) or the crest of the lower wall corresponds to the furrow of the upper wall (sinuous channel). It is found that the critical Reynolds number is substantially lower than that for plane channel flow and that when the non-dimensionalized wall variation amplitude epsilon is smaller than a critical value (about 0.26 for symmetric channel, 0.28 for sinuous channel), critical modes are three-dimensional stationary and for larger epsilon, two-dimensional oscillatory instabilities set in. Critical Reynolds numbers of sinuous channel flows are smaller for three-dimensional disturbances and larger for two-dimensional disturbances than those of symmetric channel flows. The disturbance velocity distribution obtained by the linear stability analysis suggests that the three-dimensional stationary instability is mainly caused by local concavity of basic flows near the reattachment point, while the critical two-dimensional mode resembles closely the Tollmien-Schlichting wave for plane Poiseuille flow. (C) 1998 The Japan Society of Fluid Mechanics and Elsevier Science B.V. All rights reserved
Molecular dynamics of unstable motions and capillary instability in liquid nanojets
Full text linkWe present an investigation of the capillary instability of nanometer-sized surface-tension-driven flow using molecular dynamics (MD) simulations with Lennard-Jones fluid. Unstable motions of a liquid nanojet are successfully simulated and it is found that the thermal fluctuation, which is significant in a nanoscale system, is the most important factor for various breakup scenarios of a nanojet. The nanojet diameter at the nozzle outlet is varied to show the effect of size on the rupture phenomena and the formation of small droplets. Numerical results for the rupture time and the growth rate of spherical droplets are compared with those of various classical linear instability theories. Even though the MD simulation results for the growth rate of the droplets are close to those predicted by the classical instability theories, the former are shown to be independent of the wave number unlike the latter. Therefore, the classical continuum-based theories may not be applicable to studying the instability of nanoscale systems.This research was supported by Grant No.
M102KN010010-05K1401-01010 from the Center for
Nanoscale Mechatronics & Manufacturing of 21st Century
Frontier Research Program of Korea
Numerical analysis of three-dimensional extrusion of arbitrarily shaped sections by the method of weighted residuals
No full textA generalized method for analysis of three-dimensional extrusion of arbitrarily-shaped sections
No full text
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
Variations 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
- …
