1,721,002 research outputs found
Application of analytical methods for characterization of waste and recovered solvents
Full text linkThis project is focalised on defining an analytical method for the determination of several types of volatile organic compounds and it is applied to control the processes of solvent recovery.
“Solvent Recovery” consists in the distillation and purification of organic solvents, with the objective to produce pure solvent or mix of solvents that are then re-used in the manufacturing industrial processes.
It is a strategy of pharmaceutical industry for a sustainable environment and the solvent recovery represents a growing business in waste management. In fact, environmental protection is often an important prerogative of any new process and new industrial technologies.
Official analytical methods for analysis of solvents, in environmental matrix, specified the compounds and conditions to carry out an analysis. In this work, the method EPA 8015D is evaluated as preferential method for the analysis. This method is enhanced for a great number of solvents.
Purpose of this work has been the definition of rapid and reliable analytical method for the determination of solvents in the recovered solvents.
This work shows the presentation and the statistical elaboration of results obtained following the iter of validation of the analytical method. The interest was focused on recovery data to evaluate the precision, accuracy and reproducibility of the analytical method.
The evaluation of z-score, recovery and the Analysis of Variance (ANOVA) played a pivotal role to demonstrate the validity of the purpose of this work
A phylogenetic analysis of Dipsacaceae (Dipsacales) based on four DNA regions.
No full textAbstract: Authors studied the phylogeny of Dipsacaceae using maximum parsimony and Bayesian analyses on sequence data from chloroplast (trnL intron, trnL-trnF intergenic spacer, psbB-psbH gene complex) and nuclear genomes (ITS1 and ITS2). Both data partitions as well as their combination show that Dipsacaceae is a monophyletic group. Topology in tribe Scabioseae is similar to those of other recent studies, except for the position of Pycnocomon, which is nested in Lomelosia. Pycnocomon, the pollen and epicalyx morphologies of which closely resemble those of Lomelosia, is interpreted as a psammophilous morphotype of Lomelosia, and its nomenclature has been revised accordingly. Exclusion of Pseudoscabiosa, Pterocephalidium, Pterocephalodes (and probably Bassecoia), Succisa, Succisella from Scabioseae is confirmed. Pterocephalodes hookeri is the sister group to the rest of the family. Its remoteness from Pterocephalus has been confirmed on molecular grounds. Lack of evident synapomorphies for various clades is interpreted as a possible consequence of fast adaptative radiation
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
Energy requirement for elderly ckd patients
Full text linkThe correct management of energy intake is crucial in CKD (chronic kidney disease) patients to limit the risk of protein energy wasting especially during low-protein regimes, but also to prevent overweight/obesity. The aim of this study was to assess the energy requirement of older CKD patients using objective measurements. This cross-sectional study enrolled 67 patients (aged 60–86 years) with CKD stages 3–5 not on dialysis, all of whom were metabolically and nutritionally stable. All patients underwent indirect calorimetry and measurement of daily physical activity level expressed by the average daily Metabolic Equivalent Task, using an accelerometer, in order to measure total energy expenditure (mTEE). Estimated TEE (eTEE) was derived from predictive equations for resting energy expenditure and physical activity levels coefficients. The mTEE were lower than eTEE-based on Harris–Benedict or Schofield or Mifflin equations (1689 ± 523 vs. 2320 ± 434 or 2357 ± 410 or 2237 ± 375 Kcal, p < 0.001, respectively). On average mTEE was 36.5% lower than eTEE. When eTEE was recalculated using ideal body weight the gap between mTEE and eTEE was reduced to 26.3%. A high prevalence of a sedentary lifestyle and reduced physical capabilities were also detected. In conclusion, our data support the energy intake of 25–35 Kcal/Kg/d recently proposed by the NKF-KDOQI (National Kidney Foundation-Kidney Disease Improving Quality Initiative) guidelines on nutritional treatment of CKD, which seem to be more adequate and applicable than that of previous guidelines (30–35 Kcal/Kg/d) in elderly stable CKD patients with a sedentary lifestyle. According to our findings we believe that an energy intake even lower than 25 Kcal/Kg/d may be adequate in metabolically stable, elderly CKD patients with a sedentary lifestyle
Il racconto arabo di oggi e di domani
No full textAnalisi degli sviluppi più recenti del racconto arabo, ambito nel quale si registra negli ultimi decesnni una continua sperimentazione, con il ricorso a una molteplicità di stili e di linguaggi.
Oggetto di studio è la creazione letteraria a partire dal XXI secolo, attraverso le voci di autori provenienti da tutti i paesi arabi
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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