1,721,192 research outputs found
Hinode/EIS Spectroscopic Validation of Very Hot Plasma Imaged with the Solar Dynamics Observatory in Non-flaring Active Region Cores
Full text linkWe use coronal imaging observations with the Solar Dynamics Observatory/Atmospheric Imaging Assembly (AIA), and Hinode/Extreme-ultraviolet Imaging Spectrometer (EIS) spectral data to explore the potential of narrowband EUV imaging data for diagnosing the presence of hot (T >~ 5 MK) coronal plasma in active regions. We analyze observations of two active regions (AR 11281, AR 11289) with simultaneous AIA imaging and EIS spectral data, including the Ca XVII line (at 192.8 Å), which is one of the few lines in the EIS spectral bands sensitive to hot coronal plasma even outside flares. After careful co-alignment of the imaging and spectral data, we compare the morphology in a three-color image combining the 171, 335, and 94 Å AIA spectral bands, with the image obtained for Ca XVII emission from the analysis of EIS spectra. We find that in the selected active regions the Ca XVII emission is strong only in very limited areas, showing striking similarities with the features bright in the 94 Å (and 335 Å) AIA channels and weak in the 171 Å band. We conclude that AIA imaging observations of the solar corona can be used to track hot plasma (6-8 MK), and so to study its spatial variability and temporal evolution at high spatial and temporal resolution
Il Caso Barcellona.Un'esperienza di pianificazione strategica applicata alle città.
No full textl volume affronta il tema delle strategie di sviluppo integrato di aree territoriali ad alta intensità di risorse culturali e paesaggistico-ambientali. Le argomentazioni di natura teorica, riguardanti la gestione strategica dei territori nella prospettiva della valorizzazione delle risorse contestuali in un'ottica di marketing, sono sostenute dai risultati di una ricerca empirica condotta sul sistema locale dei Campi Flegrei. L'area oggetto dell'analisi si estende nella zona occidentale della provincia e della città di Napoli ed è caratterizzata da un'intensa concentrazione di risorse ad altissimo valore storico, culturale, archeologico e paesaggistico-ambientale
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
Linguistic hemispheric asymmetries from Awake state to REM sleep.
No full textA right hemisphere (RH) superiority, as compared to left hemisphere (LH), has been shown during REM sleep with respect to Wake and NREM states for RH tasks (e.g. 1). The question can be raised wether the increasing of RH asymmetry during REM is related to RH tasks only, or it is of more general nature. As matter of fact no variations in interhemispheric differences has been found in REM LH tasks (2, 3). These findings however might be dependent upon the type of linguistic tasks used: lateralized Letter Recognition Task, with both vowels and consonants (2); linguistic dichotic task in which a phonological code could be request (3). Both the tasks demand a strictly specific LH strategy. Aim of this research is to study whether hemispheric shiftings during REM sleep can be observed also with LH tasks more accessible to RH strategies, like a lateralized Consonant Recognition Task (CRT), in which stimuli can be processed also with a RH strategy (e.g. 4).
METHOD. During one experimental night 12 male Ss (out of 16) - previously adapted to sleep Lab. - were tested in a CRT during Wake and upon awakenings from REM and NREM states.
RESULTS AND CONCLUSIONS. ANOVA shows : 1) a main effect (p<.05) indicating a general LH superiority; 2) a slightly significant (p<.09) STATE x HEMISPHERE interaction showing a decrease of interhemispheric asymmetry upon awakening from REM state. Although preliminary and not yet completed this study supports the hypothesis that RH superiority in REM sleep may not be restricted to RH tasks
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
Temperature Diagnostics of a Solar Active Region Using a Single-Filter Observation of Hinode/XRT
Full text linkBroad-band X-ray observations can provide limited temperature diagnostics through filter ratios. A high cadence observation of an active region made with a single Hinode/XRT filter allows us to use an alternative approach in which we measure the time fluctuations of the pixel count rate and use the variance as temperature proxy. We show the results and discuss limitations of method
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