1,721,145 research outputs found
Diamon Wire Cutting Technology and Workability of Natural Stones: Validation of a New Classification Method (EASE R3)
No full textThe concept of workability and stone machining has been, for the past thirty years, one of the main area of investigation in national and international researches. This study endorses a method for the prediction of stone-cutting tools interaction (mainly diamond wires) combining the micro-hardness and the UPV measurements, that better represent the mechanical, physical and petrographical stone properties. This paper studies eight different stones classified according to an "easy-to-cut" scale based on the historical company know-how (HIC - Historical Industrial Classification). The classification is based upon experience and not on explicit or really scientifically quantified parameters, nonetheless, it describes the stones workability completely. In previous works, however, criteria based on quantifiable parameters (SSC - Scientific Stone Classification) have been pursued and this led to a scientific correlation with the industrial classification. For each stone the following investigation techniques were performed: petrographic analysis, micro-hardness, Schmidt rebound, Ultrasonic Pulse Velocity (UPV). Moreover UPV measures in indirect and direct method have been executed on stone blocks in the cutting plant and compared with those performed on slabs. The results of all the performed tests were analyzed and good correlations with the industrial classification were foun
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
Stone characterization for wire cutting
No full textHardness tests and microhardness are currently considered as important methods for acquiring useful information about the workability of ornamental stones.
The concept of workability refers to rock-cutting tool since at least thirty years and is the subject of national and international researches that aim to find a model for the prediction of the behavior rock-tool thanks to data coming from fast and inexpensive tests.
In the present research 13 stones of different origin have been taken into consideration. These 13 stones have been classified by the plant owner within a scale from 1 to 10 based on the greater or lesser ease of cutting, established directly at the plant, where they were cut with a diamond wire. The parameters that have led to this classification are not known, but probably are connected with the yield in produced slab.
It was therefore decided to find criteria for the classification of the stones themselves, based on parameters coming from simple laboratory tests, which may lead to a scientific correlation with the industrial classification.
For each stone the following investigation techniques have been considered: petrographic analysis, highlighting mainly mineralogical composition, crystal size, structure and texture, microhardness, ultrasound pulse velocity. The results of all the tests performed have been elaborated and good correlations between them and the industrial classification have been found
Proposal of a new methodology for stone classification in diamond wire cutting technology (EASE-R3) (EASE-R3)
No full textHardness tests and micro-hardness are currently considered important methods for acquiring useful information about the workability of ornamental stones. For at least thirty years the concept of workability has regarded rock-cutting tools and is the subject of national and international research.
This study aims to find a method for the prediction of the behavior of rock-tools using data from easy to use, non-destructive and inexpensive tests. This paper studies 8 stones of different origin classified from 1 to 9 according to an "easy to cut" scale based on the historical company know-how (HIC - Historical Industrial Classification). This was established directly at the marble plant, where stones were cut with diamond wire. The parameters at the basis of this classification are not explicit nor scientifically quantified, because they come from the experience.
It was therefore decided to find criteria for the classification of the stones, based on parameters from simple laboratory tests (SSC - Scientific Stone Classification), which lead to a scientific correlation with the industrial classification.
For each stone the following investigation techniques were considered: petrographic analysis, higlighting mainly mineralogical composition, crystal size, structure and texture, micro-hardness, ultrasound pulse velocity (UPV). The results of all the performed tests were analyzed and good correlations with the industrial classification were found
Innovative implantable medical devices: the role of polymers, and nano- and biotechnology
No full textSyenite and diorite: a unique stone heritage in north of Italy
No full textThe Syenite from the Cervo Torrent Valley near Biella in northern Italy has been widely used as a building
material. During the XXth century it has been exported all over the World for covering and paving slabs and
monumental work. It is an intrusive magmatic rock found in the Cervo Valley pluton, which is part of the Balma
pluton. It formed about 30 million years ago as a result of the Alpine Orogeny and is known to be post-orogenic
because of the absence of metamorphism. Hydrothermal mineralization associated with the pluton includes
minerals of molybdenum, tungsten, copper, lead, silver and gold.
Utilisation of the Syenite has been the only industrial activity in the high Cervo Valley sustaining the whole of
valley life. During the second half of the XIXth century and during the first part of the XXth the competencies
and the working skills of the Cervo Valley stonecutters was exported as far as Perù and China. It was e.g. used
for the edification and refinement of the Oropa Sanctuary square in Piedmont, Italy. It has been recognized as
an interesting building material because of the intrinsic characteristics such as its resistance to mechanical wear,
durability of colour tone and intensity and resistance to water wear (e.g. in fountains) and maintains its mechanical
integrity over time.
Diorite is also a magmatic intrusive rock and, similar to the syenite, differs from granite due to the low concentration
of quartz (<10%). It consists of plagioclase, pyroxene, amphibole and quartz. It is exploited at the Vico
Canavese quarry, near Turin, Italy. It is easy to cut and to process with the suitable tools. It has a number of
variants, each with specific characteristics and behavior. It is multipurpose material and consequently it can be
used in different shape and application, such as slabs, covering, bed river, building block and tiles. Although
mainly used in Italy, it has also been used world wide for many different constructional and aesthetic purposes.
These two stones from the Canavase area have an interesting history and a wide range of uses
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
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