1,721,055 research outputs found
Experimental techniques for deflection and radiation studies with bent crystals
Full text linkWhat happens when a high energy charged particle crosses an amorphous material? It loses energy by ionization and its trajectory is affected by the multiple Coulomb scattering, being these phenomena originated by uncorrelated collisions with the atoms. If the atoms of the target were distributed according to an ordered scheme, the uncorrelated collisions would turn into a coherent interaction with the whole atomic structure. This is the case of an aligned crystal that, depending on the orientation, is seen as a set of atomic planes or strings by the impinging particles. Planes and strings produce potential wells able to confine the charged particles in a transversal region of the crystal, in the so called channeling condition, so that, bending the crystal, particles are forced to follow the curvature, being deflected. This simple and powerful idea, dating 1979, is at the basis of many theoretical and experimental studies that have proven bent crystals effectiveness, described their possible applications and optimized the deflection performances. This thesis is a bridge across two complementary fields, that is the experimental techniques applied in the crystal study and the description of the observed phenomena from the phenomenological point of view as well as from the microscopic theoretical one, resulting in a complete overview on the bent crystal physics
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
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
The Development of Historical Instruction/Teaching Material in Senior High Schools Based on Local History with SOI Approach
Full text linkABSTRACT
Purpose: The purpose of this research is to develop more comprehensive model of
historical instructional materials that is a model of local history-based teaching
materials and oriented to local historical events. The method used in the
development of historical instructional materials is Research and Development (R
& D) approach. This research is to formulate a development model of teaching
materials on Indonesian history with local history. So the appropriate method in
this research is the R & D method/approach.The development of historical
materials based on local history will give students an understanding of the
historical values that occur in their environment so that the understanding level of
historical values will more achieve the target in the historical learning objectives.
Method: The method used in the development of historical instructional materials
is Research and Development (R & D) approach. This research is to formulate a
development model of teaching materials on Indonesian history with local history.
So the appropriate method in this research is the R & D method/approach.
Findings: The developed product is teaching materials about Indonesian history
arranged on the concept of SOI (Selecting, Organizing, and Integrating.). The
development of historical teaching materials with SOI begins with the gathering
of local historical sources which are relevant to the national curriculum on the
history subjects. The selection result based on the observations of historical
objects and oral sources is combined with existing knowledge of history and
sorted which is included in national curriculum. After the materials are
selected/sorted then the next stage is to organize them which are suitable with
material orders (basic competence) on nasional curriculum. The last stage before
organizing the teaching materials is to combine the local history with national
curriculum of history subjects into the historical teaching materials. The product
of teaching materials is able to accommodate the materials of local history
relating to the basic competence in the national curriculum
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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