1,722,370 research outputs found
Sul significato dei nuovi frammenti siriaci dei Capitula adversus Caium attribuiti a Ippolito
No full textThe Canons Attributed to Basil of Caesarea in the Context of the Canonical Literature Preserved in Coptic
Full text linkI Canoni attribuiti a Basilio di Cesarea erano conosciuti finora attraverso una serie di manoscritti arabi, uno dei quali è stato tradotto in tedesco da Riedel, ma non edito; una citazione dal Canone I in un manoscritto liturgico copto di carta (pubblicato da J. Dresher); una serie di frammenti appartenenti a diversi codici copti, editi e inediti, e in particolare due fogli di un codice di papiro perduto proveniente da Deir Bala'izah (n. 31), con il testo del Canone 36 (pubblicato da P.E. Kahle); alcune fogli di un manoscritto della Chester Beatty (ms 819C, ff. 1-8) da un codice pergamena (Canoni 48-96) probabilmente derivante dal Monastero Bianco (inedito); il Codice di Torino XIII, che è costituito da un buon numero di fogli frammentari parzialmente editi da F. Rossi. A questi testimoni testuali si è aggiunto un nuovo intero codice, ora conservato al Cairo, Museo Copto. Lo scopo di questo contributo è offrire un aggiornamento sull'edizione dei Canoni e inserirli nel contesto della letteratura copta, in particolare della circolazione della letteratura canonica in questa lingua e il milieu intellettuale che l'ha promossa. Il primo paragrafo di questo contributo è stato scritto da Federico Contardi, responsabile anche dell'appendice contenente alcuni esempi di confronto della tradizione testuale copta; Alberto Camplani ha scritto il paragrafo 2, dedicato alla contestualizzazione letteraria e ideologica dei Canoni.The Canons attributed to Basil of Caesarea were known so far through a number of Arabic manuscripts, one of which was translated in German by Riedel, but not edited; a quotation of Canon I in a Coptic liturgical manuscript of paper (published by J. Dresher); a number of fragments belonging to different Coptic codices, edited and inedited, and in particular two leaves from a lost papyrus codex coming from Deir Bala'izah (n. 31), with the text of Canon 36 (published by P.E. Kahle); some Chester Beatty leaves (ms 819C, ff. 1-8) from a parchment codex (Canons 48-96) likely deriving from the White Monastery (inedited); the Turin Codex XIII, which is constituted by a good number of fragmentary leaves partially edited by F. Rossi To these textual witnesses a new entire codex has been added, now preserved in Cairo, Coptic Museum. The aim of this contribution is to offer an updating about the edition of the Canons and to place them in the context of the Coptic literature, in particular the circulation of the canonical literature in this language and the intellectual milieus that promoted it.The first paragraph of this contribution has been written by Federico Contardi, who is responsible also for the Appendix containing some examples of comparison of the Coptic textual tradition; Alberto Camplani has written paragraph 2, devoted to the literary and ideological contextualization of the Canons
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
Effect of tumor-promoting and anti-promoting chemicals on the viability and junctional coupling of human HeLa cells transfected with DNAs coding for various murine connexin proteins
No full textGap-junctional intercellular communication is thought to be essential for maintaining cellular homeostasis and growth control. Its perturbation entails toxicological implications and it has been correlated with the in vivo tumor-promoting potential of chemicals. Little is known about the mechanism(s) responsible for the tumor promoters interference with the cellular coupling. Moreover, nongenotoxic carcinogens, as well as connexins (gap-junctional protein subunits), are known to be organ-/tissue-specific; this implies that the effect of different agents should be evaluated on their specific target, that is, connexin. To investigate the role of different connexins in regulating gap-junctional gating and to compare the properties of homotypic junctional channels, we evaluated the effects of tissue-specific tumor promoters and anti-promoters on the viability and intercellular coupling (dye-transfer) of HeLa cells stably transfected with cDNAs coding for connexin(cx)43, cx40, cx26 and cx32. The results demonstrate that the transfectants possess individual junctional permeabilities, differentially affected by the chemicals, they also show different sensitivities to the cytotoxic effect of the compounds. These findings confirm that connexin diversity may be responsible for the different gating properties of gap-junctional channels, being also suggestive for their separate functions and independent regulatory mechanisms
Hardware implementation study of particle tracking algorithm on fpgas
Full text linkIn recent years, the technological node used to implement FPGA devices has led to very high performance in terms of computational capacity and in some applications these can be much more efficient than CPUs or other programmable devices. The clock managers and the enormous versatility of communication technology through digital transceivers place FPGAs in a prime position for many applications. For example, from real-time medical image analysis to high energy physics particle trajectory recognition, where computation time can be crucial, the benefits of using frontier FPGA capabilities are even more relevant. This paper shows an example of FPGA hardware implementation, via a firmware design, of a complex analytical algorithm: The Hough transform. This is a mathematical spatial transformation used here to facilitate on-the-fly recognition of the trajectories of ionising particles as they pass through the so-called tracker apparatus within high-energy physics detectors. This is a general study to demonstrate that this technique is not only implementable via software-based systems, but can also be exploited using consumer hardware devices. In this context the latter are known as hardware accelerators. In this article in particular, the Xilinx UltraScale+ FPGA is investigated as it belongs to one of the frontier family devices on the market. These FPGAs make it possible to reach high-speed clock frequencies at the expense of acceptable energy consumption thanks to the 14 nm technological node used by the vendor. These devices feature a huge number of gates, high-bandwidth memories, transceivers and other high-performance electronics in a single chip, enabling the design of large, complex and scalable architectures. In particular the Xilinx Alveo U250 has been investigated. A target frequency of 250 MHz and a total latency of 30 clock periods have been achieved using only the 17 ÷ 53% of LUTs, the 8 ÷ 12% of DSPs, the 1 ÷ 3% of Block Rams and a Flip Flop occupancy range of 9 ÷ 28%
The passive microwave empirical cold surface classification algorithm (PESCA): Application to GMI and ATMS
Full text linkThis paper describes a new Passive Microwave Empirical Cold Surface Classification Algorithm (PESCA) developed for snow-cover detection and characterization by using passive microwave satellite measurements. The main goal of PESCA is to support the retrieval of falling snow, since several studies have highlighted the influence of snow-cover radiative properties on the falling-snow passive microwave signature. The developed method is based on the exploitation of the lower-frequency channels (<90 GHz), common to most microwave radiometers. The method applied to the conically scanning Global Precipitation Measurement (GPM) Microwave Imager (GMI) and the cross-track-scanning Advanced Technology Microwave Sounder (ATMS) is described in this paper. PESCA is based on a decision tree developed using an empirical method and verified using the AutoSnow product built from satellite measurements. The algorithm performance appears to be robust both for sensors in dry conditions (total precipitable water<10 mm) and for mean surface elevation< 2500 m, independent of the cloud cover. The algorithm shows very good performance for cold temperatures (2-m temperature below 270 K) with a rapid decrease of the detection capabilities between 270 and 280 K, where 280K is assumed as the maximum temperature limit for PESCA (overall detection statistics: probability of detection is 0.98 for ATMS and 0.92 for GMI, false alarm ratio is 0.01 for ATMS and 0.08 for GMI, and Heidke skill score is 0.72 for ATMS and 0.69 for GMI). Some inconsistencies found between the snow categories identified with the two radiometers are related to their different viewing geometries, spatial resolution, and temporal sampling. The spectral signatures of the different snow classes also appear to be different at high frequency (>90 GHz), indicating potential impact for snowfall retrieval. This method can be applied to other conically scanning and cross-track-scanning radiometers, including the future operational EUMETSAT Polar System Second Generation (EPS-SG) mission microwave radiometers
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