1,720,958 research outputs found
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
PENYISIHAN KANDUNGAN BAHAN ORGANIK ALAMI PADA AIR BAKU UNTUK PRODUKSI AIR MINUM DENGAN KOMBINASI PRE-OKSIDASI DAN KOAGULASI
Get PDFDi sepanjang Kali Surabaya terdapat lebih dari 40 industri dan aktivitas domestik
yang berpotensi mencemari air Kali Surabaya. Berdasarkan metode STORET
49,44% status mutu air di Kali Surabaya adalah tercemar berat. Padahal Kali
Surabaya digunakan sebagai pemasok utama air baku bagi air minum penduduk
Kota Surabaya. Salah satu pencemar yang terdapat di air Kali Surabaya adalah
bahan organik. Kehadiran senyawa organik pada air baku untuk air minum akan
mempengaruhi proses desinfeksi. Proses desinfeksi pada umumnya dilakukan
dengan memberikan senyawa klor. Semakin besar konsentrasi senyawa klor yang
digunakan, maka hasil samping yang dihasilkan seperti terbentuknya senyawa
trihalometan dan khlorophenol juga semakin besar. Senyawa-senyawa tersebut
dapat mengakibatkan penyakit kanker (carcinogen). Berdasarkan hasil analisis,
konsentrasi TOC pada air baku sebesar 11,67 mg/liter dan nilai UV absorbansi 254
nm sebesar 0,10895 cm
, sehingga diperoleh nilai SUVA sebesar 0,934 L/mg/cm,
sehingga diketahui karakteristik pada air Kali Surabaya yang cenderung hidrofilik
dengan berat molekul rendah dan kebanyakan bukan humik yang mengindikasikan
bahwa air tersebut dihasilkan dari kegiatan domestik dan industri. Pada kombinasi
pre-oksidasi dan koagulasi, CaOCl2 dengan dosis 25 mg/liter mampu menurunkan
TOC dari 11,67 mg/liter menjadi 9,11 mg/liter, sedangkan permanganat dengan
dosis 0,8 mg/liter hanya mampu menurunkan TOC dari 11,67 mg/liter menjadi
11,25 mg/liter. Kombinasi pre-oksidasi dan koagulasi mampu menurunkan bahan
organik aromatik, ditunjukkan dengan nilai absorbansi UV210 air baku yaitu 1,4983
cm
-1
-1
dengan pre-oksidasi KMnO4-koagulan Al2(SO4)3 dan
1,3152 cm
menjadi 1,2720 cm
-1
-1
pada pre-oksidasi CaOCl2-koagulan Al2(SO4)3.
Kata Kunci : natural organic matter (NOM), pre-oksidasi, koagulas
Pencemaran Mikroplastik Pada Sungai Martapura di Kota Banjarmasin, Kalimantan Selatan
No full textMikroplastik adalah plastik dengan ukuran <5 mm – 1 µm yang dapat berasal dari kantong plastik, botol plastik, kotak makanan, dan degradasi plastik yang berukuran besar. Sungai Martapura memiliki peran sangat vital sebagai penyedia air baku untuk pengolahan air minum, pengairan pertanian, penyedia ikan, transportasi, dan perdagangan. Keberadaan mikroplastik mulai dari ukuran, bentuk maupun jenis polimernya di berbagai wilayah perairan dapat menyebabkan dampak negatif pada organisme akuatik, menyebabkan masalah kesehatan, seperti pencernaan, toksisitas, disfungsi imun, dan kelainan reproduksi. Tujuan penelitian ini adalah menganalisis kelimpahan dan karakteristik mikroplastik pada air dan ikan di Sungai Martapura, serta menganalisis kebijakan pengelolaan sampah guna meningkatkan kualitas Sungai Martapura Kota Banjarmasin, Kalimantan Selatan. Pengambilan sampel air dilakukan pada sepuluh lokasi sampling aliran Sungai Martapura Kota Banjarmasin, Kalimantan Selatan dengan dua kali pengulangan. Pengambilan sampel pada badan air mengacu pada SNI 8995:2021, sedangkan pada sampel ikan dilakukan secara manual random sampling. Ekstraksi mikroplastik pada sampel air dan ikan dilakukan menggunakan KOH 10% untuk destruksi senyawa organik dan larutan NaCl 5M sebagai pemisah densitas mikroplastik. Kemudian mikroplastik diamati di bawah mikroskop menggunakan Sedgewick Rafter Counting Cell dan dilakukan uji FTIR. Kelimpahan mikroplastik pada air Sungai Martapura berkisar 6.500-14.000 partikel/L dengan karakteristik fragment (42,72%), fiber (19,90%), pellet (19,90%), dan film (17,48%), sedangkan kelimpahan mikroplastik pada ikan di Sungai Martapura berkisar 17.500-30.500 partikel/individu dengan karakteristik fiber (57,72%), film (36,15%), fragment (5,92%), dan pellet (0,21%). Kelimpahan mikroplastik tertinggi pada air dan ikan di Sungai Martapura berlokasi di Kelurahan Pasar Lama sebesar 14.000 partikel/L dan 30.500 partikel/individu dengan karakteristik mikroplastik terbanyak jenis fragment (42,72%) pada air dan jenis fiber (57,72%) pada ikan. Kebijakan pengelolaan sampah dalam meningkatkan kualitas Sungai Martapura Kota Banjarmasin sudah cukup baik, namun masih diperlukan peningkatan kapasitas SDM, intensitas pengawasan, dan keterlibatan sektor swasta untuk memperkuat efektivitas program pengelolaan sungai secara berkelanjutan.
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Microplastics are plastic particles ranging in size from <5 mm to 1 µm, originating from plastic waste such as plastic bags, plastic bottles, food containers, and microbeads, or from the degradation of larger plastic materials. The Martapura River has a very important role as a supplier of raw water for drinking water processing, agricultural irrigation, fish supply, transportation, and trade. The presence of microplastic particles in various water bodies—varying in size, shape, and polymer type—can have negative impacts on aquatic organisms, leading to health issues such as digestive problems, toxicity, immune dysfunction, and reproductive disorders. This study aims to analyze the abundance and characteristics of microplastics in the water and fish from the Martapura River and to analyze waste management policies implemented to enhance the environmental quality of the Martapura River in Banjarmasin City, South Kalimantan. Water sampling was performed at ten sampling locations along the Martapura River flow in Banjarmasin City, South Kalimantan, with two replicates. Sampling followed the Indonesian National Standard (SNI) 8995:2021, and then fish sampling was conducted via manual random sampling. Microplastic extraction from water and fish samples involved: 10% KOH for organic matter digestion and saturated NaCl solution for density separation of microplastics. Microplastics were observed under a microscope using a Sedgewick Rafter Counting Cell and Polymer identification was performed using Fourier Transform Infrared Spectroscopy. The abundance of microplastics in the Martapura River water ranged from 6,500 to 14,000 particles/L, with the following characteristics: fragments (42.72%), fibers (19.90%), pellets (19.90%), and films (17.48%). Meanwhile, the abundance of microplastics found in fish from the Martapura River ranged from 17,500 to 30,500 particles/individual, with fiber being the most dominant type (57.72%), followed by film (36.15%), fragments (5.92%), and pellets (0.21%). The highest abundance of microplastics in both water and fish samples was observed in Pasar Lama Subdistrict, amounting to 14,000 particles/L in water and 30,500 particles/individual in fish. The most dominant microplastic type in water was fragments (42.72%), while in fish it was fibers (57.72%). The waste management policies implemented to improve the quality of the Martapura River in Banjarmasin City have demonstrated promising progress. However, enhancements are still needed in terms of human resource capacity, monitoring intensity, and private sector involvement to strengthen the overall effectiveness of sustainable river management programs
ENE Petro Services Sdn Bhd / Muhammad Firdaus Mohd Kamal
No full textIn order to complete Bachelor Degree, final year students are required to undergo industrial training at their selected company. This is to help these students to have the opportunity to experience useful knowledge on what they will face when they start working in their respective field. Industrial training will last for about 24 weeks and by the end of the internship, a report will be submitted on what they gain on the training. I have chosen ENE PETRO SERVICES Sdn Bhd as my industrial training placement company. ENE PETRO is an oil and gas parts supplier and is still a growing company. I identified this firm to be a relevant destination for my internship as the company will deal with a lot of buy and sell of products which will benefit me as a finance student as I can see how company operates and how deals are done between parties in the oil and gas industry
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