1,721,000 research outputs found
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
Leptonecrosi del susino, la Ricerca fa passi avanti.
No full textI risultati delle prove sperimentali
condotte negli ultimi quattro
anni su alcune combinazioni
innesto/portinnesto con cultivar
del gruppo cino-giapponese
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
Assessment of susceptibility to European stone fruit yellows phytoplasma of new plum variety and of five rootstock/plum variety combinations.
No full textDuring five years two trials were carried out to assess the plum susceptibility to infection by European stone fruit yellows phytoplasmas. One trial was carried out on commercial varieties /cultivars and new selections grafted on Myrabolan 29C. Plants were evaluated in more than one plot of four plants. Yearly monitoring by visual inspection and PCR/RFLP identification of phytoplasmas allowed verifying an increasing phytoplasma presence in both symptomatic and asymptomatic plants. Eight selections from Japanese plums showed ESFY symptoms or pathogen presence in the 50% of plants and nine selections showed 20% of infection. Only nine selections showed absence of both symptoms and pathogen. Although the European selections/cultivars were not symptomatic, plants belonging to six cultivars were positive to phytoplasma presence. The scond trial was carried out to evaluate cultivar/rootstock combinations; phytoplasma symptoms and presence were observed from the first year after plantation. Two of the rootstocks appeared to induce a delay in symptoms appearance and cultivar T.C. Sun was the most susceptible to the disease
Effetto delle modalità di gestione dell'alimentazione sulle caratteristiche casearie del latte
No full textMicroencapsulated lysine and low-protein diets: Effects on performance, carcass characteristics and nitrogen excretion in heavy growing-finishing pigs
No full textTwo studies were conducted to assess
the effects of dietary protein and Lys reduction on
growth performance, carcass quality, N excretion, and
plasma N profile in growing–finishing pigs from 35 to
180 kg. The growing trial was conducted with 72 gilts
and 72 barrows with 6 pens per treatment and 6 gilts
or 6 barrows per pen. Four diets with the same DE and
NE were compared: 1) control diet, 2) diet with protein
content reduced by 3% units compared with the
control diet and supplemented with Lys HCl to match
the requirements according to the 2012 NRC (FLys),
3) diet similar to FLys for protein level but supplemented
with only 50% of the Lys HCl provided with
FLys (–50% FLys), and 4) diet similar to FLys and
–50% Flys for protein level with microencapsulated
Lys added to supply 20% of the Lys provided by FLys
(–80% MLys). Pigs fed the FLys diet performed in a
similar manner and showed similar carcass characteristics
to the control pigs. Pigs fed the –50% FLys diet
had the lightest BW (P < 0.01) as well as the lightest
carcass (P = 0.02) and trimmed thigh (P = 0.04)
weights. Pigs fed the –80% MLys diet showed growth
performance and carcass characteristics similar to the
control pigs. The N balance study was conducted with
8 barrows arranged in a double replicated 4 × 4 Latin
square design. The control pigs had greater (P < 0.01)
N intake and urinary and total N excretion compared
with pigs fed the low-protein diets. The reduction of
the dietary protein concentration by 3% units decreased
total N excretion by an average of 24.5% and the greatest
reduction of total N excretion was obtained by the
–80% MLys diet (26.12%) compared with the control
diet throughout the trial. No effect of dietary treatment
was observed on the plasma concentrations of ammonia,
urea, and total AA in the 80-kg pigs. Decreased
plasma ammonia (P < 0.01) and urea (P = 0.03) concentrations
were detected in the 120-kg pigs fed the
low-protein diets. The 160-kg pigs fed the –80% MLys
pigs had less total AA, indispensable AA in particular
(P < 0.01), than pigs fed the other diets and decreased
ammonia (P < 0.01) and urea (P = 0.05) concentrations
than the control pigs. The results showed that the use of
microencapsulated Lys, compared with both Lys HCl
and dietary protein-bound Lys, can save CP and synthetic
AA in diet formulation and can reduce N excretion
in manure without adversely affecting the growth
performance and carcass quality of heavy growing–finishing
pigs
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