1,354,503 research outputs found
Petrophysical and technical properties of dimensional stones: a statistical approach
No full textThe efficient use of natural building stone is immediately connected with the cost-intensive investigation of technical properties of a rock, considering different standardizations. Hence, there are number of paper in the literature dealing with the extrapolation of technical parameters (e.g. compressive strength) based on easily ascertainable properties, like density or porosity. Consequently, well-founded statistical analyses about corresponding prognostic feasibilities as partial alternatives to laboratory analyses may be of great economical interest. The presented statistical analyses are based on a dataset, including around 2100 commercial grades of dimensional stones from more than 70 countries. Specific features in technical behaviour of single varieties, peculiar to any particular small datasets due to e.g. location details or laboratory conditions, could be eliminate as far as possible. The statistical behaviour in the different correlations between the basic parameters density and porosity, respectively, with the parameters of strength is described broadly for the main rock types (plutonic rocks, volcanic rocks, elastic sediments, carbonatic rocks, metamorphic rocks). Based on this, detailed examinations of the different interrelations are given exemplary for the plutonic and carbonatic rocks as well as the elastic sediments. In addition different approaches of regression analysis are evaluated. Furthermore the calculation of confidence regions gives a significant tool to visualize the theoretical population of the connection of two parameters. Finally the interrelations between the petrophysical/technical parameters and the ultrasonic wave velocity, as a non-destructive method for material examination, are specified
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Candida glabrata shuttle vectors suitable for translational fusions to lacZ and use of beta-galactosidase as a reporter of gene expression
No full textThe functionality of P-galactosidase encoded by the E. coli lacZ gene as a reporter of gene expression in C. glabrata was investigated. C. glabrata/E. coli shuttle vectors were constructed, containing both a C. glabrata CEN-ARS cassette, to allow regular segregation and episomal replication of the plasmids, and the lacZ coding sequence of E, coli. The functionality of P-galactosidase in C. glabrata was verified by inserting the promoter and the 5' coding region of the HIS3 gene from C. glabrata directionally upstream of the lacZ gene. By fusing the promoter of the copper-controlled MTII gene to the lacZ reporter, we showed that P-galactosidase activity can be differentially induced in C. glabrata. P-galactosidase reporter activities were detected qualitatively by an indirect filter assay and quantitatively from permeabilized cells. (C) 2000 Elsevier Science B.V. All rights reserved
Variations on the Author
No full text“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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