1,721,232 research outputs found
Design and orthogonality correction of a planar scanner for an atomic force microscope
No full textThis paper shows a method of designing a nano-positioning planar scanner that can be used in a scanning probe microscope. The planar scanner is composed of flexure guides, piezoelectric actuators and feedback sensors. Furthermore, we used a motion amplifying mechanism in the piezoelectric actuator to achieve a large travel range. We theoretically determined the travel range of the total system and verified the range by using a program based on a finite element analysis. The maximum travel range of the planar scanner was greater than 120 μm. A planar scanner of an atomic force microscope can move samples with a few nm resolutions. To get stable AFM images of small feature samples, a closed loop control could not be used due to large random errors of the sensor. The orthogonality of a new planar scanner having a motion guide is measured and corrected by using a simple electronic circuit in the open loop scanning to reduce the scanner artifact
Evaluating transport of organic chemicals in soil resulting from underground fuel tank leaks
No full textGoing 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
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