1,720,995 research outputs found
Use of bovine digesta as organic fertilizer
Get PDFObjetivou-se discutir o uso da digesta bovina como fonte de matéria orgânica para a agricultura. Atualmente existe uma preocupação crescente em relação à dilapidação dos recursos naturais, da deposição desenfreada de dejetos no meio ambiente. Iniciativas que reduzam os prejuízos no meio ambiente são importantes e necessárias, além de valorizar os produtos e melhorar o bem-estar social e ambiental. Resíduos da agroindústria podem ter um destino nobre, já que possuem características orgânicas que proporcionam a sua utilização como fertilizante orgânico no cultivo de plantas. A digesta bovina demonstra ser adubo orgânico promissor para agricultura, que promove o incremento de matéria seca, melhora o crescimento e o desenvolvimento das plantas, além de proporcionar benefícios ao meio ambiente
Uso de diferentes revestimentos na produção de pré-secado de gramíneas tropicais
Get PDFTwo experiments were carried out with haylage, one with marandu grass and the other with
tanzania grass, both with the same objective, which consisted of evaluating the gas
quantification, temperature, fermentation characteristics, chemical composition and aerobic
stability of the haylage coated with films of different thicknesses. Four plastic films of different
thicknesses were tested as haylage coating (10, 11, 13 and 27µm) associated to storage times
and during aerobic stability (0, 48 and 96 h) in a completely randomized design with three
replications organized in factorial schemes. Gas quantification and temperature were evaluated
in the first 48 h (4 × 4), being four films and four storage times (0, 12, 24 and 48 h) and over
the storage days (4 × 5), four films and five storage times (0, 7, 15, 30 and 60 d). The
fermentative characteristics were evaluated in a factorial scheme (4 × 4), being four films and
four storage times (7, 15, 30 and 60 d). In the evaluations during aerobic stability (4 × 3), there
were four films and three storage times (0, 48 and 96 h). The chemical composition was
evaluated only after the opening at 60 days. In the marandu grass, the oxygen concentration
stabilized at 12 h below 5% and the carbon dioxide after 7 d with 37.17%. There was little
variation in pH, and the lowest values were observed at 60 days (pH 5.13 to 5.4). There was a
predominance of molds and yeasts with little variation between the films (7.02 to 7.51 log10 cfu
g
-1
), as well as lactic acid bacteria (5.54 to 6.11 log10 cfu g-1
) and enterobacteria (6.34 to 6.84
log10 cfu g-1
). There was effect only on the dry matter, with the highest average in the treatment
of 13µm (522.4 g kg-1 DM). In the Tanzania grass, the O2 concentration stabilized at 12 h below
4%. The highest pH was in the 27 µm film at 7 and 15 days (pH 7.15 and 6.54, respectively),
whereas at 60 days, all films had a similar pH. Higher averages of molds and yeasts were
observed in the film of 27µm (7.13 log10 cfu g-1
) and 13µm (7.32 log10 cfu g-1
) in the effect of
the film. The film of 13µm provided a higher content of dry matter (655 g kg
-1
) and crude
protein (140.9 g kg-1 DM). In both experiments, all coatings allowed low fermentation of
organic acids and low ammoniacal nitrogen concentration, as well as a stable temperature
during the aerobic stability of 96 h. Thus, films of 10, 11, 13 and 27µm of thickness can be used
in the coating of haylage of marandu and tanzania grass. The use is recommended after 60 days
of storage.Foram realizados dois experimentos com pré-secado, um com capim-marandu e outro com
capim-tanzânia, ambos com o mesmo objetivo, que consistiu em avaliar a quantificação gasosa,
temperatura, características de fermentação, composição química e estabilidade aeróbia em pré secado revestido com filmes de diferentes espessuras. Foram testados quatro filmes plásticos
de diferentes espessuras no revestimento de pré-secado (10, 11, 13 e 27µm) associado aos
tempos de armazenamento e durante a estabilidade aeróbia (0, 48 e 96 h) em delineamento
inteiramente casualizado com três repetições organizados em esquemas fatoriais. A
quantificação gasosa e a temperatura foram avaliadas nas primeiras 48 h (4 × 4), quatro filmes
e quatro tempos de armazenamento (0, 12, 24 e 48 h) e nos dias de armazenamento (4 × 5),
quatro filmes e cinco tempos de armazenamento (0, 7, 15, 30 e 60 d). As características
fermentativas foram avaliadas em esquema fatorial (4 × 4), quatro filmes e quatro tempos de
armazenamento (7, 15, 30 e 60 d). Nas avaliações durante a estabilidade aeróbia (4 × 3), quatros
filmes e três tempos de armazenamento (0, 48 e 96 h). A composição química foi avaliada
apenas na abertura de 60 dias. No capim-marandu a concentração de oxigênio estabilizou às 12
h abaixo de 5% e o dióxido de carbono após 7 d com 37,17%. Houve poca variação no pH, os
menores valores foram aos 60 dias (pH 5,13 a 5,4). Teve predominância de mofos e leveduras
com pouca variação entre os filmes (7,02 a 7,51 log10 ufc g-1
), bactérias lácticas (5,54 a 6,11
log10 ufc g-1
) e enterobactérias (6,34 a 6,84 log10 ufc g-1
). Houve efeito apenas para matéria
seca, com maior média para 13µm (522,4 g kg-1 MS). Já no capim-tanzania, a concentração de
O2 estabilizou às 12 h abaixo de 4%. O pH mais elevado foi no filme de 27µm aos 7 e 15 dias
(pH 7,15 e 6,54), respectivamente, já aos 60 dias, todos os filmes tiveram pH semelhante.
Maiores médias de mofos e leveduras foram observadas no filme de 27µm (7,13 log10 ufc g-1
)
e 13µm (7,32 log10 ufc g-1
) no efeito do filme. O filme de 13µm proporcionou maior teor de
mareia seca (655 g k-1
) e proteína bruta (140,9 g kg-1
de MS). Em ambos experimentos todos
os revestimentos permitiram baixa fermentação de ácidos orgânicos e concentração de
nitrogênio amoniacal, assim como temperatura estável durante estabilidade aeróbia de 96 h.
Dessa forma, filmes de 10, 11, 13 e 27µm de espessura podem ser utilizados no revestimento
de pré-secado de capim-marandu e capim-tanzânia. Recomenda-se a utilização aos 60 dias de
armazenamento
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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