1,720,960 research outputs found
NUTRIENT CONCENTRATION AND PH IN THE CISADANE ESTUARINE AND COASTAL WATERS
No full textThe study on the fluctuation of dissolved nutrient concentrations and acidity (pH) in the Cisadane Estuary was carried out in May 2004 October 2004 and July 2005. Inorganic phosphate, nitrate and silicate of the surface water were analyzed, using Spectrophotometer and pH was measured with a pH meter. Generally the nutrient concentrations in the estuary were higher compared to those in the coastal and offshore areas. The concentrations were gradually becoming lower and lower toward the open sea. Their fluctuation depended not only on the environmental condition but also on the water volurrie from the land and the mangrove forest in that area
COMPARISON OF TWO SAMPLING METHODS (CORER AND IN SITU SEDIMENT SIPPER METHODS) FOR THE PORE WATER OF SEDIMENT
No full textEffect of two sampling techniques (i.e. corer and sipper samplers) of sediment pore water on measured concentrations of phosphate, nitrate and ammonia was examined. The concentrations of nitrate and ammonia in relation to sediment depth (vertical variations) collected by corer and sipper sampler do not show significant differences, while for phosphate concentrations significant differences occurred. The advantages and disadvantages of both techniques are discussed
Fluktuasi Nitrat, Fosfat dan Silikat di Perairan Pulau Bintan
Get PDFPulau Bintan di Provinsi Kepulauan Riau merupakan wilayah perairan yang diandalkan sebagai penghasil bahan tambang bauksit, penghasil komoditas perikanan dan sebagai daerah wisata yang banyak dikunjungi oleh wisata baik lokal ataupun mancanegara. Wilayah pesisir dan sumber daya yang dimiliki Pulau Bintan merupakan kontributor penting untuk pembangunan ekonomi dan kualitas hidup sehingga perlu dikelola dengan baik. Penelitian ini bertujuan untuk mengetahui kondisi perairan Bintan ditinjau dari kandungan nitrat, fosfat, dan silikat pada dua musim yang berbeda yang nantinya dapat digunakan oleh pemerintahan setempat dan instansi terkait dalam mengembangkan dan mengelola perairan kawasan perairan Pulau Bintan. Pengambilan sampel untuk penelitian nutrien (nitrat, fosfat, dan silikat) di perairan timur Kepulauan Bintan telah dilakukan di 27 titik lokasi pada April dan Agustus 2014. Konsentrasi nutrien berfluktuasi pada April dan Agustus. Nilai rata-rata kosentrasi nitrat, fosfat, dan silikat pada April berturut-turut yaitu 0,0510 ± 0,0014 mg/L, 0,0050 ± 0,0026 mg/L dan 0,2660 ± 0,1655 mg/L. Konsentrasi rata-rata nitrat, fosfat, dan silikat pada Agustus berturut-turut yaitu 0,0260 ± 0,0104 mg/L, 0,0160 ± 0,0091 mg/L dan 0,057 ± 0,035 mg/L. Konsentrasi nitrat, fosfat, dan silikat di perairan Bintan termasuk dalam kategori rendah
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
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