1,721,009 research outputs found
Applications of high-resolution solid-state NMR spectroscopy in food science
No full textThe principal applications of high-resolution solid-state NMR spectroscopy, in the field of food science, are reviewed, after a short general introduction, mainly focusing on the potential of these investigations, which are, today, routine tools for resolving technological problems. Selected examples of the applications in the field of food science of high-resolution solid-state NMR spectroscopy both in 13C and in 1H NMR particularly illustrative of the results obtainable are reported in some detail. © 2008 American Chemical Society
High resolution solid state NMR spectroscopy of foods
No full textThe general principles of the application of high
resolution solid-state NMR spectroscopy in food
science are presented in a simplified way to become
easily familial to the reader. Some preliminary
introductory notes about the chemical properties of
the foods in the solid-state are also reported. The
principal applications have been reviewed mainly
focussing the potentiality of these investigations,
which are routine tools for resolving technological
problems in food industry. Some selected examples
of application of high resolution solid-state NM
Fluidi termovettori ad elevata conducibilità termica
No full textLa presente invenzione riguarda la realizzazione e l'utilizzo di nuovi fluidi termovettori ad elevata conducibilità termica, che permettono di aumentare l'efficienza in termini di scambio termico di un qualunque sistema che utilizzi un fluido. Per fluido "termovettore" o "di scambio termico" o anche "diatermico" si intende una qualunque sostanza allo stato liquido che sia in grado di accumulare e trasportare calore
Evaluation of safety performances of a superficial disposal facility subject to an aircraft impact and fuel burning
No full textSafety and security aspects are of meaningful importance in the design of nuclear facilities.
In this study, the attention is so focused on the potential damaging effects that a large civilian airplane impact could bring in safety relevant structures, like a superficial repository similar to El
Cabril one.
Safety performances of such a type of superficial disposal facility, subjected to the aircraft impact and fuel burning, have been analysed and discussed.
Conservative assumptions have been made: normal impact on the lateral repository surface, fire scenario based on the amount of fuel burnt.
Load functions (calculated with the Riera approach) and the maximum temperature reached by fuel during its combustion were used as input (boundary condition) in the numerical simulations as well as the damaging phenomena occurring in the concrete structure.
Numerical analyses, by MARC© code, allowed to simulate the thermo-structural performances of the superficial repository.
The obtained results showed that a repository wall thickness, ranging from 0.6 to 0.9 m, is not sufficient to prevent the penetration of wall itself. Despite the ongoing concrete degradation phenomena, the global strength of the repository seemed to be guaranteed
A procedure to measure the emissivity of ultra-thin graphene based film in long wavelength infrared (LWIR) spectrum region
No full textIn the present paper, an experimental procedure to measure the emissivity of ultra-thin graphene based films (G-paper) is presented, with the aim to determine the effect of measuring temperature and graphene concentration on the G-papers emissivity. To this end, two methods were adopted, both according to the ASTM E1933 Standard: Contact Thermometer Method (CTM) and Noncontact Thermometer Method (NTM). The latter was modified in order to take in account the specimens characteristics. In both the cases an IR camera, with a spectral range of 7.5-14 mu m, was adopted. The experimental tests were performed by heating 50 mu m thick G-papers, with different graphene contents (in the range 70-100%). The tests were carried out in the temperature range of 80-200 degrees C. During the NTM tests, a conductive paint was adopted as reference materials for the temperature measuring. Before the tests, the paint calibration curve was obtained. Statistical methodologies, Design Of Experiment and ANalysis Of VAriance, were adopted in order to identify the factors affecting the emissivity. Results show that the measuring temperature and the test methods do not affect the emissivity. The latter decreases at the graphene content increase and vary in the range of 0.38-0.51, minimum and maximum values measured for a graphene content of 100% and 70% respectively
A procedure to measure the emissivity of ultra-thin graphene based film in long wavelength infrared (LWIR) spectrum region
No full textIn the present paper, an experimental procedure to measure the emissivity of ultra-thin graphene based films (G-paper) is presented, with the aim to determine the effect of measuring temperature and graphene concentration on the G-papers emissivity. To this end, two methods were adopted, both according to the ASTM E1933 Standard: Contact Thermometer Method (CTM) and Noncontact Thermometer Method (NTM). The latter was modified in order to take in account the specimens characteristics. In both the cases an IR camera, with a spectral range of 7.5–14 μm, was adopted. The experimental tests were performed by heating 50 μm thick G-papers, with different graphene contents (in the range 70–100%). The tests were carried out in the temperature range of 80–200 °C. During the NTM tests, a conductive paint was adopted as reference materials for the temperature measuring. Before the tests, the paint calibration curve was obtained. Statistical methodologies, Design Of Experiment and ANalysis Of VAriance, were adopted in order to identify the factors affecting the emissivity. Results show that the measuring temperature and the test methods do not affect the emissivity. The latter decreases at the graphene content increase and vary in the range of 0.38–0.51, minimum and maximum values measured for a graphene content of 100% and 70% respectively
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
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