1,721,038 research outputs found
Pseudoexfoliation syndrome in a patient with lattice corneal dystrophy
No full textWe report the case of a 70-year-old female who presents lattice corneal dystrophy type I in association with pseudoexfoliation syndrome. This association has never been reported in patients not affected by systemic amyloidosis
Enhancing anaerobic treatment of domestic wastewater. State of the art, innovative technologies and future perspectives
No full textRecent concerns over public health, environmental protection, and resource recovery have induced to look at domestic wastewater more as a resource than as a waste. Anaerobic treatment, owing to attractive advantages of energy saving, biogas recovery and lower sludge production, has been suggested as an alternative technology to the traditional practice of aerobic wastewater treatment, which is energy intensive, produces high excess of sludge, and fails to recover the potential resources available in wastewater. Sewage treatment by high-rate anaerobic processes has been widely reported over the last decades as an attractive method for providing a good quality effluent. Among the available high-rate anaerobic technologies, membrane bioreactors feature many advantages over aerobic treatment and conventional anaerobic systems, since high treatment efficiency, high quality effluent, pathogens retention and recycling of nutrients, were generally achieved. The objective of this paper is to review the currently available knowledge on anaerobic domestic wastewater treatment for the mostly applied high-rate systems and membrane bioreactors, presenting benefits and drawbacks, and focusing on the most promising emerging technologies, which need more investigation for their scale-up
Dissolved methane in anaerobic effluents. A review on sustainable strategies for optimization of energy recovery or internal process reuse
No full textThe growing interest in public health and environmental protection, and the need of resource recovery imposed by the environmental sustainability, induce to look at the anaerobic wastewater treatment as an attractive alternative to the current aerobic treatment practice. In order to exploit the great potential of anaerobic wastewater treatment, thanks to the consolidated technology of high rate bioreactors, the presence in the treated effluent of dissolved CH4 deserves further investigation to avoid energy loss and to reduce greenhouse gas emissions. Reported concentrations of dissolved CH4 in anaerobic effluents can account for about half of the total production, thus strategies for its recovery as energy source, or reuse by biological oxidation within the same treatment line, are the keys to approach energy-neutral anaerobic treatment, and to valorize the intrinsic features of such process to be economically feasible and environmentally friendly. The aim of this review is to offer a complete overview of the available technologies, both for the dissolved CH4 recovery through physical methods, such as aeration, gas stripping and degassing membranes, and for its biological removal through down-flow hanging sponge reactors and the more recent proposed process based on denitrification and anaerobic CH4 oxidation (DAMO). Each technology has been deeply described highlighting weaknesses and strengths at different operating conditions and bioreactor configurations. The resulting critical analysis allowed identifying the knowledge gaps still existing in the field and the related research needs
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
Rimozione di composti xenobiotici in reattori sequenziali a due fasi. Case study: 4-nitrofenolo
No full text
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
LASEK V/S PRK vantaggi e limiti delle due metodiche refrattive rispetto alla sintomatologia
No full textGli A.A. mettono a confronto le due metodiche di chirurgia fotorefrattiva. Valutano i vantaggi di una tecnica rispetto all’altra. Prendono in considerazione le complicanze. Analizzano i risultati alla luce di un foll-up di circa due anni.Materiali e metodi : 20 pazienti con miopia di grado compreso tra –3 e -10 sono stati sottoposti a PRK in OD e LASEK in OS . Hanno quindi risposto a domande circa il confort post operatorio , all’immediatezza del recupero visivo, etc.
Risultati : I risultati a breve ed a lungo termine non hanno evidenziato differenze sostanziali tra le due metodiche.Conclusioni: Pur non presentando differenze sostanziali ai fini refrattivi si possono valutare dei vantaggi della LASEK rispetto alla PRK se vengono osservati degli accorgimenti tecnici opportun
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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