1,720,983 research outputs found
An evaluation of the responses of some tea clones to environment in Kenya
Get PDFAn experiment set up at four sites in Kericho, Kenya was used to investigate
Genotype x Environment interactions of four tea clones of commercial and scientific
interest.
Small differences in environment resulted in large variations in dry matter production
and yield between sites and clones. The largest dry matter was from clone TNI 4/3
(291 ha'1) but it had low yield (2.11 ha'1/ 1). By contrast, the largest yield was from
clone S15/10 (3.81 h a 'V 1), which gave the smallest dry matter ( I S th a 1). These
contrasting responses in dry matter and yield were analysed in terms of the interception
of solar radiation, radiation use efficiency, partition of dry matter and components of
yield. The differences in clonal dry matter production were attributed to site to site
variability in solar radiation and temperature which affected the rates of ground cover
development and the solar radiation interception. The differences in yield were attributed
mainly to differences in air temperature and saturation deficits of the air between the
sites which affected the shoot replacement cycles through rates of shoot extension and
development.
Differences in measured and derived environmental variables between the sites were
found. Incident solar radiation differed between the sites by up to 2.4M Jm 2 d 1.
Differences in mean air and soil temperatures between the extreme sites were 2.5 °C and
3 °C respectfully. A lapse rate of 6.1 “Ckm*1 for mean air temperature was found.
Annual rainfall amounts also differed between the sites by up to 700 mm. There were no
differences in wind speeds, but there were large differences were in saturation deficits
(0.5 kPa) and évapotranspiration (1 mm d*1).
During the course of the experiment light interception ranged from less than 5% at
planting to more than 80% in April 1994. Radiation use efficiencies for dry matter
ranged from 0.30 to 0.45 g MT1 in the clones studied and appeared conservative with
respect to temperature across the sites.
Clone TNI4/3 had the lowest base temperature for shoot extension (6.1 °C), while
clone BB35 had the highest (10.4 °C). The base temperatures for shoot extension were
1.3 to 2.9 °C higher than those for development, hence the differences in shoot lengths
between sites. Shoot replacement cycle ranged from 57 days to 110 days between the
sites and was the main determinant of yield.
Abstract
Silsoe College
WK Ng’etich
PhD. 1995
CranfisM,m
The dry matter content of shoots varied between sites and seasons and ranged from
18% to 33%. Mean shoot dry mass was inversely proportional to temperature, ranging
from 6 to 12% difference between extreme sites.
Loss in yield due to water stress during the dry seasons ranged from 14 to 20%
across the sites. Yield losses due to ‘hut sites’ ranged from 10 to 50%, while that from
hail damage accounted for up to 20% of annual yields.
These results are discussed in the light of other work in Kericho and southern
Tanzania. The thesis concludes by considering the implication of the results for the tea
industry
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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