1,721,479 research outputs found
A study of infrared diabatic forcing of ice clouds in the tropical atmosphere
No full text[1] The diabatic exchange occurring in the atmosphere and within ice cloud layers in tropical standard conditions is investigated. The crossover from the spectral region in which the cloud's layer experiences a net emission ( roughly the far infrared) to the region in which it experiences net absorption ( window) does not significantly depend on the ice amount, but appears strictly connected with cloud's height and atmospheric temperature structure. For a fixed atmosphere, the cloud's internal structure of radiative heating and cooling is highly dependent on cloud trasmissivity. The energy absorbed by ice crystals at the base of a cirrus is different from that absorbed by the air molecules occupying the same layer and the effects of scattering are quantified and compared to particle's emission. Simulations have been done in case of spherical and hexagonal column-shaped ice particles. Small differences are obtained in the integrated quantities due to compensating effects which appear fairly unimportant when compared to uncertainties caused by our inadequate knowledge of some of the main properties of ice clouds, such as ice amount and effective radius. Of larger magnitude are variations in layer's absorbed flux due to changes in the water vapor concentration
Some considerations on the infrared cloud forcing
No full textLong-wave spectral cloud forcing is computed for realistic clouds of various optical thickness embedded in the tropical and subarctic winter standard atmospheres. The strict connections between the integrated long-wave cloud forcing (LCF) and cloud's altitude and transmissivity are shown. LCF, especially in presence of ice clouds, grows almost linearly with cloud transmissivity, and largest values are found in presence of high and opaque cirri. We have also considered the effect of incomplete spectral coverage in broadband long-wave radiometry when estimating LCF. The error has been computed as a function of edge cutoff (two different filters are used) and cloud's transmissivity and top altitude. Uncorrected measurements from sensors with incomplete spectral coverage generally underestimate the real LCF, especially for the highest cirrus clouds in the tropics. A correction is possible since the percentage error is practically constant with cloud's transmissivity
Sviluppo di un metodo per la determinazione di colesterolo, squalene e acidi grassi nel cuoio capelluto.
No full textDire bugie o dire verità ? Prototipi della menzogna e della verità, differenze individuali ed effetti sul benessere soggettivo.
No full text
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
Residui e riusi di materiali agrourbani a matera,
No full textIl lavoro che si presenta intende riflettere criticamente intorno al tema del riciclo e del riuso di materiali urbani degradati, nella particolare declinazione di sottoprodotti e relitti del sistema produttivo che reclamano oggi una risignificazione. La ricostruzione lucana delle vicende di questi presidi degradati o dismessi, memoria di una città fabbrica che oggi lascia il posto a nuove vocazioni, consente da un lato di rileggere i processi storici di metamorfosi e interazione tra urbanità e paesaggio agrario italiano, dall’altro diventa opportunità per comprendere le prospettive di un nuovo modello agrourbano dentro cui assume senso un progetto di riattivazione di questi manufatti conservando, aggiornandole, le funzioni originarie.
La rilettura del sistema complesso di produzione e residenza costituito da fabbriche, Mulini, borghi e quartieri della Ricostruzione,offre alla riflessione materiali di un passato agrourbano da ricollocare nella storia contemporanea di una missione urbana per Matera
- …
