1,720,974 research outputs found
Assessment of sorbent/water ratio effect on adsorption using dimensional analysis and batch experiments
No full textMany factors affect adsorption phenomena in solid–liquid systems. One of the most important factors is the sorbent/
water (S/W) ratio in the system. However, the effect of varying S/W ratios on the adsorption is still unclear. In this
study, batch experiments were examined to observe the adsorption of four contaminants (copper, cadmium, Butachlor,
and Deltamethrin) in six soils with texture ranging from silty clay to loamy sand and with different S/W ratios. Dimensional
analysis was used to assess the relationship between adsorption phenomena and S/W ratio. We have assumed
that the total amount of sorbate sorbed in soil is a function of the equilibrium concentration, the volume of sorbate
solution, and the sorbent amount in the system. A power function (Freundlich-like) model was obtained from the
dimensional analysis. It can describe precisely the adsorption phenomena of different sorbents and sorbates in the
moisture regime of paddy soils. Therefore, proper adsorption parameters can be obtained by this power function model
regardless of the solids effect, which can then be utilized to describe the fate of solute in soil using solute transport
models. 2002 Elsevier Science Ltd. All rights reserved
Mass Selection for Bupleurum Kao
No full text二年生高氏柴胡1261株中選出501株優良單株，等比種子數目進行混合，選出231株優良單株，混合之後種植，新的族群之平均株高為94~105cm，分枝26~33，葉長6.1~7.2cm，根重84~108g，根直徑l.43~2.36cm，根長22~34cm，高氏柴胡的根重與地上部的莖直徑具有顯著正相關（相關係數0.81)，選拔方向以莖的直徑較大、分枝數目較多、撒型花序數目較多與根不過分粗大為主，並選擇直立型、根高產及Saikosaponin含量較高的柴胡植株。植株的株高、株重、分枝、根長、根徑與根重間均有顯著正相關。柴胡皂素主要分佈於植物根部，且集中於根部較外層之皮層與韌皮部中，在根部組織中均含有，但由根粗部位往細部位遞增，根毛部位的含量最多，Saikosaponin的含量與根粗成負相關，與根中韌皮部／木質部比例成正相關。柴胡在作物繁殖之分類上屬於常異交作物，花器構造小，人為雜交困難，其抽苔期、株高、分枝數、莖直徑等性狀在族群內之變異相當大，造成採收及利用上之不便。高氏柴胡為台灣特有之柴胡物種，多為野生採集使用，野性極強，但其柴胡皂素之含量據分析優於其他柴胡物種，因此值得開發利用，惟族群之變異程度相當大，故以混合選種法(mssselection)，利用抽苔期、株高、分枝數、莖直徑為選拔指標，分群選拔其根部的產量高及表現型能達一致，以改進族群。
We selected 501 plants from the two-years planted population of 1261 plants Bupleurum Kao Leu chao et chuang, and used equal number of seeds each plants to sowing for mass selection. The average agronomic characters of new population was : height:94- 105cm, branch:26-33, leaf length:6. 1-7.2cm, root weight:84-108g, root diameter: 1.43-2.36cm, root length:22-34cm. Root weight and stem diameter had positive correlation(correlation coefficient: 0.81 ).The selection objective were longer stem diameter, more branch number, more flower number, and proper root diameter. In addition to, erect plant, high yield of root and more content of saikosaponin were be selected for cultured and medical use. Plant height, weight, branch, root length, root diameter, and root weight had positive correlation for each other. More content of saikosaponin were discovered from the cortex of root, phloem of root and root hair. The content of saikosaponin and root diameter had negative correlation. The agronomic variance of Bupleurum Kao were most significant in cultivated and wild population. Bupleurum Kao is a special species distributed in Taiwan of Buplever and the effective content was more superior than the other Buplever. It’s a well used medically for liver health or hepatitis. The mass selection method is effective for breeding of Bupleurum Kao
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
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
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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