1,720,998 research outputs found
Disinfection efficiency of peracetic acid (PAA): inactivation of coliphages and bacterial indicators in a municipal wastewater plant.
No full textA study on microbial and chemical pollution of surface waters with special reference to metals, VHO and pesticides.
No full textThe Authors of the present study have evaluated the quality of Torrente Savena water, examining the major bacteriological and physical-chemical parameters such as metals, volatile halogenated organocompounds and pesticides, known for their persistence in the environment. The results, obtained from two sampling points, Pianoro (hilly country) and S. Lazzaro di Savena (before Savena’s inflow into the Idice torrent) showed a remarkable worsening of microbiological conditions of the torrent’s terminal segment, below the S. Lazzaro di Savena depurator outflow. Along with the microbiological parameters, also the traditional physical-chemical parameters were increased in this sampling point, with the exception of dissolved oxygen. As to the metals, their concentrations were generally modest, especially in the hilly segment. VHO were not found in Pianoro; although in low concentrations, such compounds were detected four times in S. Lazzaro only. Finally, during the investigation period, chlorinated pesticides were not present in measurable quantities; as to triazine pesticides, only the atrazine was detected in 3 S. Lazzaro samples. A comparison with traditional microbiological and chemical parameters, furnished by a previous similar study, showed a worsening of water pollution in Pianoro; on the contrary, S. Lazzaro water conditions appeared improved
Microbial contamination in dental unit waterlines: comparison between er:yag laser and turbine lines.
No full textRicerche sulla qualità microbiologica e chimica delle acque del torrente Idice, con particolare riferimento a metalli, organoalogenati volatili e pesticidi
No full textLa qualità delle acque del torrente Idice – affluente del fiume Reno – è stata valutata ricercando i principali parametri batteriologici – indicatori di contaminazione fecale, salmonelle, pseudomonas e stafilococchi – e chimici, tra cui, oltre ai parametri tradizionali, i metalli, i composti organoalogenati volatili e alcuni pesticidi. I risultati relativi alle 4 stazioni di campionamento hanno messo in evidenza un aumento dell’inquinamento di tipo domestico dalla prima alla terza stazione ed una successiva riduzione nell’ultima stazione, a monte dell’immissione nel Reno, probabilmente per processi di autodepurazione. Relativamente ai parametri batteriologici accessori, sono stati riscontrati Pseudomonas aeruginosa in quantità elevate in tutte le stazioni, e alcune specie del genere Staphylococcus (ad eccezione di S. Aureus). Per quanto concerne i metalli, soprattutto nel tratto montano le concentrazioni sono risultate generalmente modeste e i composti organoalogenati volatili sono stati riscontrati saltuariamente e a dosi contenute. Sono state inoltre rilevate saltuariamente scarse quantità di lindano e, nei mesi in cui viene maggiormente impiegata (aprile e maggio), di atrazina. Complessivamente, la qualità microbiologica e chimica delle acque del torrente Idice è risultata soddisfacente e migliorata rispetto a quella riscontrata in precedenti indagini
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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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