1,721,003 research outputs found
New records of oribatid mites (Acari: Oribatida) from Argentina
Full text linkRuiz, E.V., Rizzuto, S., Martinez, P.A. (2018): New records of oribatid mites (Acari: Oribatida) from Argentina. Zootaxa 4370 (2): 194-200, DOI: 10.11646/zootaxa.4370.2.
Lamellozetes pseudoareolatus Covarrubias 1967
No full textLamellozetes pseudoareolatus Covarrubias, 1967 Material studied. Huemules (1). Distribution. Andean (Chile). Remarks. The species was described by Covarrubias, 1967. His specimens were collected on Isla Muñoz Gamero, Province of Magallanes, Chile, in cold forests.Published as part of Ruiz, E. V., Rizzuto, S. & Martinez, P. A., 2018, New records of oribatid mites (Acari: Oribatida) from Argentina, pp. 194-200 in Zootaxa 4370 (2) on page 196, DOI: 10.11646/zootaxa.4370.2.8, http://zenodo.org/record/114385
Design and implementation of a new scheduler for enhancing multi-rate fairness in IEEE 802.16
No full textWithout the definition of a mandatory scheduling algorithm for channel resource assignment, WiMAX is open to Quality of Service (QoS) enhancements by research groups and developers, at the aim of managing heterogeneous flows with different QoS requirements. Furthermore, besides performance enhancement, another key issue arises for QoS delivery: it is known as multi-rate fairness and it deals with efficient resource allocation for providing sufficient bandwidth to high rate flows, without penalizing low rate ones. In this paper, uplink scheduling algorithms are studied and an innovative solution is proposed to achieve performance enhancement, multi-rate fairness and improved QoS management. After an overview of the state of the art, two scheduling algorithms based on Deficit Round Robin are studied, implemented and tested in NS2 simulator. The schedulers are validated and compared through exhaustive simulations, showing the benefits coming from the adoption of the proposed scheduling mechanism
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
RUOLO DEL PLASMA ARRICCHITO IN PIASTRINE (PRP) IN FORMA GELIFICATA NEL TRATTAMENTO DELLE ULCERE DA DECUBITO: PRESENTAZIONE DI UN CASO CLINICO
No full textLe ulcere da decubito rappresentano una condizione frequente in popolazioni ad alto rischio quali gli anziani e i soggetti con compromissione dell’autonomia funzionale, dall’ipomobilità sino all’allettamento. Esse si con-figurano come un indicatore negativo dell’assistenza sanitaria erogata in quanto potenzialmente prevenibili attraverso l’applicazione di alcune regole fondamentali per la cura e la corretta gestione del paziente non autonomo. L’invecchiamento della popolazione, con il conseguente aumento dei soggetti con deficit funzionali, multimorbilità e comorbilità complesse e, quindi, in ultima analisi, fragili, ha contribuito e continuerà a determinare un aumento dell’incidenza e della prevalenza delle ulcere da pressione. Definire le dimensioni del fenomeno sul piano epidemiologico, tuttavia, è difficile; la stima delle ulcere da decubito, inoltre, varia nei diversi setting assistenziali (reparto per acuti, reparti di area medica o chirurgica, lungodegenza, residenze sanitarie assistenziali). È necessaria una gestione multidisciplinare del fenomeno con particolare attenzione rivolta non solo alla diagnosi e alla cura, ma anche e soprattutto alla prevenzione.
Descriviamo il caso di un paziente di sesso maschile, di 66 anni, con ulcera da decubito giunto alla nostra osservazione per la necessità di riattivazione funzionale geriatrica
Videolaparoscopic cholecystectomy in patients with previous abdominal surgery. Personal experience and literature review
No full textObjectives. Laparoscopic cholecystectomy (LC) is today the "gold standard" treatment of gallbladder stones. Role of LC is still debated in the presence of abdominal scars due to the frequent post-operative adhesions which make access to the peritoneal cavity difficult. This study aim to assess role and outcomes of LC on a previous abdominal surgery on the scarred abdomen. Materials and Methods. we have carried out a retrospective study on 499 consecutive patients who had undergone LC from 2009 to 2015; 21 of these (4.2%) undergone previous abdominal surgery. In all 21 cases the pneumoperitoneum was established with Veress needle at the Palmer's point and the procedure was carried out after adhesiolysis in 62% of cases. Results. the mean operative time was 79±12 minutes; none of the patients with previous abdominal surgery required conversion to open cholecystectomy and there were no postoperative complications related to Veress introduction or to the adhesiolysis. The difficult dissection and adhesiolysis were more frequent in the patients with upper abdomen scar (62%) respect to lower abdomen scar (38%). Conclusion. patients with scarred abdomen for previous abdominal surgery had obviously more adhesions in the abdomen than patients without preceding surgery, but today previous abdominal surgery should not constitutes absolute contraindications to LC. Moreover, patients with previous lower abdominal incisions had fewer adhesions in the upper abdomen than did patients with upper incision and, probably, in these cases adhesiolysis is unnecessary, if the surgical field is well exposed whereas adhesiolysis is mandatory when the adhesions are thick and widespread, to the anterior and posterior abdominal wall
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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