1,721,016 research outputs found
Dataset for "Scale-up effects in alkali-activated soil blocks"
No full textChemical characterisation, mechanical testing and physical data describing the manufacturing process and properties of alkali-activated soil blocks.The experimental approach and methodology is fully described in the accompanying article "Scale-up effects in alkali-activated soil blocks" .For XRD (Figs. 1, 3, 4):
Powder X-ray diffraction (XRD) patterns were taken with a Bruker D8 Advance diffractometer using Cu Kα (λ = 1.54060 Å) X-radiation using a step size of 0.02 °(2θ). For the precursor soil and act-120h samples, a different Bruker D8 Advance diffractometer was used with monochromatic CuKα (λ = 1.540598 Å) X-radiation and a step size of 0.016 °(2θ). Patterns were corrected for specimen height shift by calibrating to the most intense quartz reflection (101) at 26.6 °(2θ), and normalised to the most intense reflection in each respective pattern. Phase identification was done using Bruker EVA software.
For measuring specimen mass (Fig. 7):
The mass change behaviour of the block specimens was measured after curing, and after 7 days ageing time. Average values and standard deviations were calculated for ≥4 measurements for each series.
For measuring UCS (Fig. 10):
Unconfined compressive strength (UCS) testing was done at 7 ±1 days ageing time, using a TUN600 Universal Testing Machine. At least four block specimens were tested for each series. The frogs on both sides of each block specimen were filled in with a mix of Plaster of Paris and <1.18 mm sieved sand to create a level surface.
For measuring particle density (Fig. 11):
Particle density was measured by He gas displacement using a Micromeritics Accupyc 1330. Before measurement, powder samples were heated at 150°C under vacuum for 1 hour
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
Structural evaluation of a novel box beam system of Pultruded Fibre Reinforced Polymer shapes
Full text linkPresented in this thesis is an evaluation of a novel box beam system of Pul-
truded Fibre Reinforced Polymer (PFRP) shapes. The flat-pack modular beam
system consists of separate PFRP flange and web shapes joined together with
a new method of mechanical fastening. It is based on the first generation Star-
tlink building system, conceived by UK engineers in 1999. The Startlink building
system is introduced, and classified within the scope of Modern Methods of Con-
struction (MMC), and its merits are discussed. In the context of MMC a critical
review by the author finds that, although the proposed 1999 generation Startlink
system offers design flexibility, it will probably have a limited market potential.
The novel use of the steel MlO Unistrut connection method as a means of
fastening distinct PFRP shapes in a building system is characterised. Individ-
ual connector design parameters for joint stiffness and resistance are identified
and determined, under pure shear loading. The results of a series of physical
tests show no significant loss of stiffness or strength with long term environmen-
tal exposure. Values of key mechanical properties for design calculations are
recommended.
A 400 x 200 x 2848 mm prototype PFRP box beam assembly is fabricated from
two flange and two web panel-type shapes, cut from existing off-the-shelf PFRP
shapes. This is 60 mm deeper than the largest single PFRP shape that could
be used as a beam. The assembly is joined at the web-flange junction with M10
Unistrut connectors set at various spacing's, in the range 50 to 400 mm. These
connectors carry the longitudinal shear that is generated between the joined
shapes when the modular assembly is in flexure, Theoretical deflections, cal-
culated using a modified form of a partial-interaction analysis model developed
for composite concrete and steel structures, are predicted for the assembly ac-
counting for the finite shear stiffness of the web-flange connection. A series of
16 four-point bending load tests on the beam assembly, across two load arrange-
ments, show that its performance is linked to the designated spacing of the M10
Unistrut connections. The flexural rigidity and degree of interaction present in
the assembly are determined from analysis of vertical deflections and longitudi-
nal strains, as the beam is deformed. The influence of secondary effects, due to
the poor tolerances achieved in the hand fabrication of the beam's assembly, are
found to greatly affect the ability of the deflection analysis to give the required
measured deflections. Comparison of the effective joint shear rigidities obtained
from theory and testing indicates a higher individual connection stiffness in the
prototype beam than previously determined by way of the individual Unistrut
connector characterisation.
It is found through the combined analytical and physical testing research that
the M10 Unistrut connection method can only provide the necessary joint shear
stiffness and resistance to the 400 mm deep beam if the connector spacing, along
the four joints, is ≤ 50 mm. The total number of connectors this represents in the
beam is likely to make this modular construction approach too expensive for it to
be commercially viable. Although the M10 connector could be used to fabricate
beams of lesser depths, since the number of connectors will then be reduced, these
beams would find it difficult to compete with the available off-the-shelf PFRP
beam shapes, of up to 300 mm deep. There is however scope to use the Unistrut
method of connection to provide longitudinal shear resistance in building systems
where, for example, a floor panel is to be stiffened by a channel shaped beam and
the overall depth is ≤ 300 mm.
The research work contained in this thesis has contributed to a radical change
in the PFRP product offerings now proposed in the 2006 generation Startlink
building system
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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