1,720,962 research outputs found
STUDI ANALISIS KUALITAS AIR SUNGAI BAH BIAK KOTA PEMATANGSIANTAR
Full text linkHigh community activity on the border of the Bah Biak River causes pollution in the waters of the river. The increase in the number of settlements and industries in Pematangsiantar city certainly has an impact on the quality of its waters. The purpose of this study is to find out the water quality of the Bah Biak River in Pematangsiantar City covering the physical and chemical parameters of the waters. This research was conducted in 2021 in Bah Biak River Pematangsiantar city. Water sampling in the Bah Biak River is carried out with three repetitions, namely in March, June and August taking into account the representation of the seasons. Water sampling is carried out in situ for parameters of brightness, pH, total dissolved solid (TDS), electrical delivery, temperature and dissolved oxygen (DO), ammonia, while for laboratory scale measurements are carried out for biologycal oxygen demand (BOD) and chemical oxygen demand (COD) parameters. The results of the measurement will be displayed in graphic form and descriptively discussed by referring to the specified quality standards. Based on the results of measurements of several water quality parameters in the Bah Biak River, it can be concluded that the majority of the parameters studied still meet the quality standards but there are parameters that have passed the quality standard threshold, namely BOD and ammonia parameters.
ABSTRAK
Tingginya aktivitas masyarakat di sempadan Sungai Bah Biak menyebabkan pencemaran di perairan sungai tersebut. Peningkatan jumlah pemukiman dan industri di Kota Pematangsiantar tentu berdampak kepada kualitas perairannya. Tujuan penelitian ini adalah untuk mengetahui kualitas air sungai Bah Biak di Kota Pematangsiantar meliputi parameter fisik dan kimia perairan. Penelitian ini dilakukan pada tahun 2021 di Sungai Bah Biak Kota Pematangsiantar. Pengambilan sampel air di Sungai Bah Biak dilakukan dengan tiga kali pengulangan yaitu pada bulan Maret, Juni dan Agustus dengan mempertimbangkan keterwakilan musim. Pengambilan sampel air dilakukan secara insitu untuk parameter kecerahan, pH, total dissolved solid (TDS), daya hantar listrik, suhu dan dissolved oxygen (DO), ammonia, sedangkan untuk pengukuran skala laboratorium dilakukan untuk parameter biologycal oxygen demand (BOD) dan chemical oxygen demand(COD). Hasil pengukuran akan ditampilkan dalam bentuk grafik dan dibahas seacara deskriptif dengan merujuk pada baku mutu yang ditetapkan. Berdasarkan hasil pengukuran beberapa parameter kualitas air di Sungai Bah Biak maka dapat disimpulkan bahwa mayoritas parameter yang diteliti masih memenuhi baku mutu namun terdapat parameter yang telah melewati ambang baku mutu yaitu parameter BOD dan ammonia.
Kata Kunci: kualitas air, aktivitas masyarakat, pencemaran, baku mutu, Sungai Bah Bia
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
ANALISA KUALITAS AIR DI PANTAI KUALA TANJUNG, DESA KUALA INDAH KABUPATEN BATU BARA TAHUN 2021 (STUDI KASUS KEMATIAN MASSAL IKAN)
Full text linkThousands of fish were seen suddenly dying in the waters of Kuala Indah, Sei Suka District, Batubara Regency. Based on information from the community, the alleged cause of the mass death of fish that occurred on April 24, 2021 was caused by the input of domestic and industrial waste and the explosion of the plankton population. The purpose of this study was to determine the factors causing mass death of fish through analysis of water quality parameters with physical, chemical and microbiological tests of river, estuary and sea water. The method used to analyze river, estuary and sea water samples is using standard methodstesting, 23rd edition 2017, APHA-AWWA-WEF. Parameter testing includes three physical parameters, the 17 chemical parameters and two biological parameters analyzed were then compared with quality standards according to Government Regulation number 22 of 2021 concerning the Implementation of Environmental Protection and Management. Based on the research results, the range of index values of water quality obtained is 75-80 and is included in good criteria, so it can be concluded that anthropogenic activities in river, estuary and sea waters are not the cause of mass fish death.
ABSTRAK
Ribuan ekor ikan terlihat mendadak mati di perairan Kuala Indah Kecamatan Sei Suka Kabupaten Batubara. Berdasarkan informasi dari masyarakat, dugaan penyebab terjadinya kematian massal ikan yang terjadi pada 24 April 2021 disebabkan oleh masukan limbah domestik dan industri serta ledakan populasi plankton. Tujuan penelitian ini adalah untuk mengetahui faktor penyebab kematian massal ikan melalui analisis parameter kualitas air dengan uji fisika, kimia dan mikrobiologi air sungai, muara dan laut. Metode yang digunakan untuk analisa sampel air sungai, muara dan laut yaitu menggunakan pengujian standard methods, 23rd edition 2017, APHA-AWWA-WEF. Pengujian parameter meliputi tiga parameter fisika, 17 parameter kimia dan dua parameter biologi yang dianalisi kemudian dibandingkan dengan baku mutu sesuai Peraturan Pemerintah nomor 22 tahun 2021 tentang Penyelenggaraan Perlindungan dan Pengelolaan Lingkungan Hidup. Berdasarkan hasil penelitian kisaran nilai indeks kualitas air yang diperoleh adalah 75-80 dan termasuk dalam kriteria baik, sehingga dapat disimpulkan bahwa kegiatan antropogenik di perairan sungai, muara dan laut bukan merupakan penyebab terjadinya kematian massal ikan.
Kata kunci : Kematian ikan, kualitas air, antropogenik, Kuala Indah, Kabupaten Batu Bar
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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