1,721,037 research outputs found
[Ludovico Antonio, Bianca and Carlo Caprara (c.1817), funerary sculpture]
No full textFrom Berresford: Ludovico Antonio, Bianca and Carlo Caprara (c.1817), Giacomo de Maria, Cimitero della Certosa, Bologna.Woman carrying urn, angel.Title from Berresford
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
Quantitative experiments in a distance lab: Studying blackbody radiation with a smartphone
No full textIn this paper we present an experiment aimed at investigating the thermal radiation law. The spectrum of a filament light bulb is acquired at different temperatures using a low-cost grating spectrometer based on a smartphone camera, while the measurement of filament temperature is obtained indirectly from the temperature dependence of the filament resistance. Two different methods for measuring the light intensity are tested: one is based on the use of the ambient light sensor of a smartphone, the other on a home-made grating spectrometer coupled with the smartphone camera. We observe a good agreement of the experimental data with the theoretical predictions of the Planck distribution in the limit of the Wien approximation restricted to the wavelength range characterizing the response of the smartphone light sensor and camera
The use of an electronic beet to evaluate sugar beet damage at various forward speeds of a mechanical harvester
No full textMechanical harvesting strongly affects the quality of sugar beets, mainly in terms of root injuries, tare, and extracted sugar. In Mediterranean countries, the effects of sugar beet damage are more critical because of the warm and humid climate at harvesting time. In order to investigate the dynamic interaction between mechanical tools and roots, electronic devices have been developed in some European countries for measuring impacts experienced by roots when passing through the harvesters. At the University of Bologna, an electronic beet with a 4905 m/s2 tri-axial accelerometer was developed in 1998. This device was used in a field trial for measuring and recording impacts in terms of peak acceleration, duration, and velocity change during impact. The device was placed into the soil in place of a real beet and then harvested by a six-row self-propelled harvester, which was tested at four different forward speeds. Assessments of the level of damage on the harvested sugar beets were also carried out according to the IIRB international method. The aim of the study was to evaluate how different forward speeds tested on a single harvester can affect damage to the roots, to assess the damage caused at each step of the harvesting process, and to find a correlation between damage and impacts. Mechanical parameters recorded by the electronic beet were referenced to three specific positions, defined as A, B, and C zones, within the harvester. The ANOVA results in A zone, composed of lifting shares and roller bed, and in B zone, composed of transfer web and turbines, showed a statistical significance. In C zone, composed of tank elevator and tank, the variables had no statistical significance. The results of the trial showed that A zone had the highest values of the variables. A harvester forward speed of 6 km/h caused the fewest taproot breaks and bruises. A linear model describing the relationship between taproot breaks and impact velocity change showed a statistical significance for A zone, while no significance was determined for B zone
Integration of algae production in a biogas plant fed by livestock waste and vegetable biomass
No full textVariations 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
Using smartphone cameras and ambient light sensors in distance learning: The attenuation law as experimental determination of gamma correction
No full textIn times of the explosion of distance learning, because of emergency due to the pandemic, smartphone sensors and cameras are extremely valuable for teachers as they allow students to perform significant experimental activities in their own homes. The open-source software Tracker can be used in combination with the smartphone camera to perform measurements not only of mechanics activities, but also of optics. In the latter case, it is not always easy for students to understand how the pixel brightness which can be inferred from the taken photos are related to actual physical light intensity. In this paper we present a simple experiment to verify the exponential decay in the intensity of light going through successive sheets of a material (the Lambert law) with two different methods, i.e. using either the smartphone light sensor or the smartphone camera and Tracker. Besides its theoretical significance, the experiment constitutes a useful tool for calibrating the camera/Tracker combination to use it for different experiments
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
- …
