1,721,214 research outputs found
Influenza del procedimento di cementazione dei tubi inclinometrici sulle misure
No full textSi descrivono alcuni casi di impiego delle misure inclinometriche per lo studio dei cinematismi di frana in tre pendii naturali con diversa morfologia e caratterizzati da una copertura quasi sempre in moto su un substrato roccioso. Gli inclinometri analizzati sono stati cementati con procedimenti diversi in funzione delle caratteristiche dei terreni attraversati: metodo tradizionale di iniezione di boiacca di cemento in risalita dal fondo foro; riempimento dall’alto con ghiaia miscelata a cemento; iniezioni successive di boiacca di cemento e riempimento dall’alto con ghiaia. Per i tre pendii si dispone anche di rilievi topografici per cui è possibile valutare l’affidabilità delle misure inclinometriche confrontandole pure con gli spostamenti di superficie. Dall’analisi delle misure inclinometriche è possibile esprimere una valutazione sull’efficacia dei procedimenti di cementazione utilizzati ed individuare i procedimenti di cementazione più idonei in dipendenza delle specifiche situazioni geotecniche e finalità delle misure.Three different applications of inclinometer measurements to monitor the response of natural slopes are described in the paper. In all cases, soil movements occur in the upper layers of the slope, where a relatively shallow cover of soils slides over a stronger bedrock. Thus, the base of all inclinometers is fixed in a stable deposit.
In the paper, the attention is focused on the grouting procedures adopted to cement the inclinometer casings against the surrounding soil. In fact, the stiffness and strength of the annular grout should be as close as possible equal to those of the surrounding soil, to obtain measures that closely represent the response of the in situ soil. To this aim, the measurements from a total of seven inclinometers are examined and interpreted herein together with the installation procedures; these have been varied according to local experience and soil conditions.
Some of the casings have been grouted using the classic water-cement mix. In this case the mix was pumped from the base of the hole upwards, until the space between the soil and the casing had been filled. Some other casings were grouted from the top downward. In this case the annular space was filled using a mixture of cement and gravel.
The remaining casings were grouted in stages. At the beginning a water-cement grout was pumped upwards from the base and also from mid-half of the column. When the level of mix in the annular space did not raise, because the grout flowed in the fissures of the rock, fine gravel was poured from the top in order to thicken the mix and keep it around the tubes.
It shall be noted that the base of the inclinometers reaches a rock layer or a gravel alluvium that are highly permeable; hence the loss of grout at the base is certainly possible.
Examining the data collected in the seven casings, it can be recognized that the grouting procedure can have a significant impact on the quality and reliability of the measures. On one hand it is necessary to fill completely the annular space between the casing and the soil, making a continuous grout, with no voids. On the other hand, the stiffness of the grout should be essentially equal to that of the surrounding soils. If such requirements are fulfilled the response of the inclinometer will show no time lag. In essence, even small movements will be detected and it is not necessary to wait until enough displacements have accumulated to trace the position of the failure surface.
The erratic data from inclinometers T12 and Arche 2 can be taken as an example of a discontinuous or partially completed grout, presumably due to leaching into the base strata. In this cases the inclinometer casings would not be fixed and could sustain some irregular displacements different from those actually occurring in the surrounding soil.
On the other hand the more regular data from V12 can be interpreted as the effect of a continuous grout, that fills completely the annular space between the tubes and the surrounding soil. However, some doubts arise with respect to the stiffness of this grout, since two years of continuous monitoring seem insufficient to detect the sliding surface.
In fact, the inclinometer T4I, where a mix of fine gravel and cement was used to grout the casing, showed negligible time lag, allowing to detect the sliding surface after a short period of observations.
Finally, in the case of Arche 3, in which the grout is likely to be continuous, the interpretation of the measures processed with different procedures does not yield a unique trend. Therefore it is not possible to understand the failure mechanism, if present
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
Restauro e ampliamento della scuola media “Don G. Bosco” a Cerignola
No full textPubblicato in: C. Piva, Un mosaico di episodi. Composizioni architettoniche nella città, in “Aión”, n. 11, 2006.
Esposto in occasione della mostra: Periferie e nuove urbanità, Triennale di Milano, giugno-ottobre 2003;
Festival dell’Architettura 5 2009-2010, Parma, Reggio Emilia Modena, 26 novembre-12 dicembre 2010
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
I mitocondri purificati da grano duro sono sensibili alla radiazione del laser ad Helium-Neon
No full textkoamabayili/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
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