1,720,958 research outputs found
Komposisi dan Struktur Komunitas Fitoplankton Di Danau Maninjau Kabupaten Agam Sumatera Barat.
No full textix, 65 Hal
Komunikasi Fitoplankton dan kaitannta terhadap Produktifitas Primer Serta Serapan Karbondioksida Di Perairan Pesisir Sumatera Barat.
No full textxii, 148 hal
“Komunitas Fitoplankton dan Kaitannya Terhadap Produktivitas Primer Serta Serapan Karbon Dioksida Di Perairan Pesisir Sumatera Barat”
Full text linkPenelitian ini telah dilaksanakan dari bulan April - Oktober 2015 di Teluk Sungai Pisang (Kota Padang) dan Kota Pariaman. Penelitian ini menggunakan metode porposive sampling. Masing-masing lokasi dipilih 3 stasiun sampling, yaitu di Teluk Sungai Pisang di Pulau Setan, Ujung dan Pulau Pasumpahan dan Kota Pariaman di Pulau Kasiak, Pulau Angso Duo dan Pulau Tangah. Dari penelitian yang telah dilakukan didapatkan hasil 127 jenis fitoplankton yang tergolong kedalam empat divisi yaitu Crysophyta, Chlorophyta, Cyanophyta dan Pyrrophyta. Dari divisi Chrysophyta jenis fitoplankton yang banyak ditemukan dari kelas Bacillariophyceae, selanjutnya diikuti oleh Divisi Pyrrophyta yang didominasi oleh kelas Dinophyceae. Kepadatan fitoplankton di pesisir Sumatera Barat rata-rata berkisar antara 1364,69-1567,817 ind/l. Kepadatan fitoplankton terendah yaitu 1364,69 ind/l berada pada perairan Kota Pariaman, sedangkan kepadatan fitoplankton tertinggi berada di perairan Kota Padang yaitu 1567,817 ind/l. Produktivitas primer di perairan pesisir Sumatera Barat rata-rata berkisar antara 98,21-119,26 mg C/m3/4jam dan nilai klorofil-a pesisir Sumatera Barat rata-rata berkisar antara 0,019-0,035 mg/m3. Perairan pesisir Sumatera Barat dapat menyerap CO2 dengan nilai flux (aliran) CO2 dari atmosfer ke laut rata-rata di perairan Kota Padang yaitu-176.262,42 mol CO2/m2 /yr , dan perairan Kota Pariaman -108.633,061 mol CO2/m2 /yr.
Kata kunci : Komunitas fitoplankton, Karbon dioksida dan Produktivitas prime
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
Eksistensi Zooplankton di Perairan Pembangkit Listrik Tenaga Uap (PLTU) Teluk Sirih dan Faktor Fisika dan Kimia Perairan
Full text linkDalam operasionalnya Pembangkit Listrik Tenaga Uap (PLTU) Teluk Sirih mengasilkan air bahang yang diduga akan memberikan berpengaruh pada perubahan faktor lingkungan seperti fisik, kimia dan biologi laut, salah satu yang terkena dampaknya adalah zooplankton. Tujuan penelitian untuk mengamati struktur komunitas zooplankton di perairan yang terkena dampak air panas PLTU Teluk Sirih. Penelitian dilakukan pada bulan Agustus 2023 dengan empat stasiun sampel yaitu Outfall, Inlet, Jetty dan tengah laut sebagai kontrol. Hasil penelitian menunjukkan bahwa struktur komunitas zooplankton yaitu ditemukan 18 jenis zooplankton dan indeks keragaman (H’) yang tergolong baik berkisar antara 2,094-2,453. Indeks Rata (E) 0,793-0,906 dan Indeks Dominasi (C) 0,100-0,192. Nilai E dan C menunjukkan fitoplankton tersebar merata dan tidak ada genera yang mendominasi di perairan PLTU Teluk Sirih. Faktor fisika dan kimia air semuanya sesuai dengan baku mutu berdasarkan Keputusan Menteri Negara Lingkungan Hidup (KEPMENLH) No. 51 Tahun 2004 dengan suhu berkisar antara 29-320C, pH 7-8, kecerahan >3m, Salinitas 31,4-32,2 ‰. DO 5 mg/L,. Dapat disimpulkan kondisi perairan baik dan eksistensi zooplankton di perairan PLTU Teluk Sirih juga dalam kondisi bai
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
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