1,720,959 research outputs found
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
Analisis Potensi Erosi pada Das Deli Menggunakan Sistem Informasi Geografis
No full textThe Deli DAS (watershed) is a part of the river area unit of the Wampu River, the Ular River, and the Padang River which has the area of 472.98 square kilometers. It consists of seven sub-watersheds passing the downtown of Medan. The increasing human interaction with Deli watershed has brought about land erosion along the watershed.
A modern technological application which is able to provide the information about the potential erosion, TBE (dangerous erosion level), land sediment, and the flow of land erosion into the river are need in order to know the cause of the increasing incidence of land erosion along the Deli DAS. This information can be used as guidance for decision making in handling the effect of erosion and for discovering why the river is becoming shallow as the result of land erosion. Therefore, it is necessary to conduct a research, entitled, “The Analysis of the Potential Erosion along the Deli DAS (Watershed), Using SIG (Geographical Information System)” which constitutes the composite between Universal Soil Loss Equation (USLE) as the estimation for potential erosion and the Decree of the Minister of Forestry of the Republic of Indonesia in 2009 as the estimation for TBE and Verstraten equation 2007 as the estimation for the sediment flow capacity which was influenced by vegetation with SIG which yielded special data base to become a new information deposit in the potential erosion along the Deli DAS.
The result of the research showed that the Deli DAS underwent five incidences of erosion: very minor damaged (3,138,312 hectares or 6.64%), minor damaged (7,505,460 hectares or 15.87%), moderate (24.019, 166 hectares or 50.78%), heavily damaged (12,013,670 hectares or 25.40%), and seriously damaged (621,423, hectares or 1.31%) with the average erosion annually of 138.808 tons/ha/year or 6,565,344,948 tons/year was in the landmark of moderate erosion class. The implementation of land conservation along the Deli DAS had caused land erosion to decrease around 56.64 tons/ha/year or 59.20%, compared with the amount of land erosion prior to the land conservation. Based on the category of TBE, the Deli DAS was domineered by the criteria of serious danger/ very critical land with the area of 28,760,755 hectares or 60.81% of the total Deli DAS area. The estimation of erosion which flowed to the downstream of sub-Deli Petani DAS was around 2.638 tons/ha/year, sub-Deli Deli DAS was around 3.99 tons/ha/year, sub-Deli Paluh Besar DAS was around 2.291 tons/ha/year, sub-Deli Sei Sekambing DAS was around 0.158 tons/ha/year, sub-Deli Simaimai DAS was around 2.141 tons/ha/year, sub-Deli Babura DAS was around 7.121 tons/ha/year, and sub-Deli Bekala DAS was around 4.619 tons/ha/year. The flow of sediment that occurred along the Deli DAS was 162,288,818 tons/ha/year which yielded sediment volume of 81,144,41 cubic meters so that it was estimated that the cost for taking the river sediment caused by land erosion would be Rp.1, 282, 081,662 per year.Daerah Aliran Sungai (DAS) Deli merupakan salah satu bagian satuan wilayah sungai (WS) Wampu – Ular – Padang yang memiliki luas 472,98 km2
Untuk mengatasi terjadinya erosi tanah yang terus menerus meningkat di DAS Deli, maka diperlukan suatu aplikasi teknologi mutakhir yang mampu menggambarkan informasi potensi erosi, tingkat bahaya erosi (TBE), endapan lahan, dan masuknya erosi tanah ke sungai. Sehingga nantinya berfungsi sebagai pedoman pembuat keputusan untuk penanggulangan dampak erosi dan pendangkalan sungai akibat erosi tanah pada DAS Deli, oleh karena itu perlu dilakukan suatu kajian dengan judul: “Analisis Potensi Erosi pada DAS Deli Menggunakan Sistem Informasi Geografis (SIG)”yang merupakan komposit antara metode Universal Soil Loss Equation (USLE) sebagai pendugaan potensi erosi, peraturan Menteri Kehutanan RI, 2009 sebagai pendugaan tingkat bahaya erosi (TBE), dan persamaan Verstraten, 2007 sebagai pendugaan kapasitas angkutan sedimen yang dipengaruhi vegetasi dengan Sistem Informasi Geografis (SIG) yang menghasilkan basis data spasial menjadi lapisan informasi baru pada potensi erosi di DAS Deli.dan terdiri dari tujuh sub DAS yang langsung melintasi jantung kota Medan, akibat interaksi manusia yang terus meningkat terhadap DAS Deli akan memberikan dampak erosi tanah terhadap DAS tersebut.
Hasil penelitian menunjukkan bahwa DAS Deli mengalami 5 kejadian sebaran erosi, yaitu sangat ringan 3.138,312 ha (6,64 %), ringan 7.505,460 ha (15,87 %), sedang 24.019,166 ha (50,78 %), berat 12.013,670 ha (25,40 %), dan sangat berat 621,423 ha (1,31 %), dengan erosi rata – rata tahunan 138,808 ton/ha/tahun atau 6.565.344,948 ton/thn berada pada tolak ukur kelas erosi sedang, dengan adanya penerapan konservasi tanah di lahan DAS Deli terjadi penurunan erosi tanah sebesar 56,64 ton/ha/tahun atau terjadi persentasi penurunan akibat konservasi lahan sebesar 59,20 % dari besaran erosi sebelum konservasi tanah. Berdasarkan kategori tingkat bahaya erosi (TBE), DAS Deli didominasi pada kriteria sangat bahaya/lahan sangat kritis dengan sebaran luas 28.760,755 ha atau 60,81 % dari total luas DAS Deli. Perkiraan erosi yang masuk ke hilir sungai sub DAS Deli Petani berkisar 2,638 ton/ha/tahun, sub DAS Deli Deli berkisar 3,939 ton/ha/tahun, sub DAS Deli Paluh Besar berkisar 2,291 ton/ha/tahun, sub DAS Deli Sei Sekambing berkisar 0,158 ton/ha/tahun, sub DAS Deli Simaimai berkisar 2,141 ton/ha/tahun, sub DAS Deli Babura berkisar 7,121 ton/ha/tahun, dan sub DAS Deli Bekala berkisar 4,619 ton/ha/tahun. Kemudian pelepasan sedimen yang terjadi di sungai DAS Deli sebesar 162.288,818 ton/tahun yang menghasilkan volume sedimen 81.144,41 m3, maka dapat diperkirakan biaya pengambilan sedimen sungai akibat erosi tanah sebesar Rp . 1.282.081.662/year.359 HalamanTesis Magiste
Studi Karakteristik Muara Sungai Belawan Sumatera Utara
No full textMuara sungai (estuari) merupakan proses tempat terjadinya percampuran dua
masa air antara air laut dan air sungai. Masuknya air laut ke arah hulu sungai (intrusi air
asin) dari hasil pengamatan lapangan pada muara Sungai Belawan diperoleh sekitar 18
km dari mulut estuari menuju arah hulu sungai hingga diperolehnya kandungan
parameter badan air yang tidak terpengaruh salinitas akibat pasut, muara Sungai
Belawan memiliki tipe sudut asin (well-mixed estuary).
Dalam pengamatan karakteristik fisik estuari dilakukan penentuan titik lokasi
yang dimulai dari mulut estuari yang diberi simbol J hingga kearah hulu sungai dengan
simbol A. jarak tiap titik lokasi dari J-A sejauh 18 km dibagi tiap 2 km, kemudian
dilakukan pemodelan dengan bantuan program Microsoft Office Excel menggunakan
rumus – rumus teoritis dari fisik estuari.
kedalaman maksimum berkisar 12 m akibat pasang tertinggi pada jam ke 3 dan
diperoleh penyebaran parameter pada saat pasang tertinggi suhu pada badan air
diperoleh 28.14 ºC dan penyebaran kadar garam diperoleh 26.7 ‰ dan penyebaran zat
padat tersuspensi diperoleh 99.94 mg/l dari kondisi ini badan air pada saat pasang
tertinggi TSS melebihi batas ambang yang diberikan oleh pemerintah menyatakan jika
TSS > 80 mg/l tidak layak untuk kehidupan perikanan, mandi dan selam. Akibat debit
banjir sebesar 697.81 m3/detik yang mempengaruhi penampang muara Sungai Belawan
yang menghasilkan aliran sungai sebesar 0.19 m/det yang akan mendorong kecepatan
arus pasut yang terjadi pada model fisik estuari , maka diperoleh intrusi air laut masuk
kedalam sungai berkurang sejauh 6 km dari kondisi pada saat debit sebesar 15 m3/detik
sehingga intrusi air asin yang masuk kedalam sungai sejauh 12 km188 HalamanSkripsi Sarjan
Studi Karakteristik Muara Sungai Belawan Sumatera Utara
No full textMuara sungai (estuari) merupakan proses tempat terjadinya percampuran dua
masa air antara air laut dan air sungai. Masuknya air laut ke arah hulu sungai (intrusi air
asin) dari hasil pengamatan lapangan pada muara Sungai Belawan diperoleh sekitar 18
km dari mulut estuari menuju arah hulu sungai hingga diperolehnya kandungan
parameter badan air yang tidak terpengaruh salinitas akibat pasut, muara Sungai
Belawan memiliki tipe sudut asin (well-mixed estuary).
Dalam pengamatan karakteristik fisik estuari dilakukan penentuan titik lokasi
yang dimulai dari mulut estuari yang diberi simbol J hingga kearah hulu sungai dengan
simbol A. jarak tiap titik lokasi dari J-A sejauh 18 km dibagi tiap 2 km, kemudian
dilakukan pemodelan dengan bantuan program Microsoft Office Excel menggunakan
rumus – rumus teoritis dari fisik estuari.
kedalaman maksimum berkisar 12 m akibat pasang tertinggi pada jam ke 3 dan
diperoleh penyebaran parameter pada saat pasang tertinggi suhu pada badan air
diperoleh 28.14 ºC dan penyebaran kadar garam diperoleh 26.7 ‰ dan penyebaran zat
padat tersuspensi diperoleh 99.94 mg/l dari kondisi ini badan air pada saat pasang
tertinggi TSS melebihi batas ambang yang diberikan oleh pemerintah menyatakan jika
TSS > 80 mg/l tidak layak untuk kehidupan perikanan, mandi dan selam. Akibat debit
banjir sebesar 697.81 m3/detik yang mempengaruhi penampang muara Sungai Belawan
yang menghasilkan aliran sungai sebesar 0.19 m/det yang akan mendorong kecepatan
arus pasut yang terjadi pada model fisik estuari , maka diperoleh intrusi air laut masuk
kedalam sungai berkurang sejauh 6 km dari kondisi pada saat debit sebesar 15 m3/detik
sehingga intrusi air asin yang masuk kedalam sungai sejauh 12 km188 HalamanSkripsi Sarjan
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