1,720,954 research outputs found
Analisa Kondisi Perubahan Dasar Sungai dengan Uji Model Fisik Hidraulik Dasar Bergerak (Studi Kasus:Sungai Barito di Kalahien Kalimantan Tengah)
Full text linkSungai Barito merupakan sungai besar yang mempunyai kemanfaatan yang sangat besar terhadap lingkungan di sekitarnya. Pada Desa Kalahien Provinsi Kalimantan Tengah, terdapat sebuah jembatan yang melintasi sungai Barito tersebut. Kondisi jembatan, saat ini mengalami penggerusan tebing, terutama pada daerah belokan luar di hulu jembatan dan tebing sungai persis di pangkal jembatan sisi kanan. Pangkal jembatan yang semula berada pada dataran tanah, saat ini telah tersingkap abutmen jembatannya sehingga memerlukan penangan yang segera untuk menghindari kondisi yang lebih berbahaya bagi kestabilan konstruksi jembatan secara keseluruhan. Penelitian ini dimaksudkan untuk mengetahui kondisi hidrolika aliran, perubahan dasar sungai yang terjadi pada sistem Sungai Barito di Kalahien, dan mengetahui kondisi hidrolika aliran, perubahan dasar sungai akibat variasi perlakuan teknis untuk pemecahan masalah yang dilakukan. Penelitian ini dibagi dalam tahapan: persiapan awal, membuat rancangan perlakuan dan rancangan analisa penelitian, perancangan model fisik hidraulik dasar bergerak, kalibrasi alat ukur, pembuatan bangunan dan verifikasi model perencanaan, pelaksanaan model fisik hidraulik (running model), pembahasan dan kesimpulan. Pada penelitian ini kesesuaian uji model dipilih dengan skala model tidak sama (distorted model) 1:200. Material menggunakan campuran pasir halus+batubara dengan perbandingan 1 pasir halus+3 batubara. Dengan bilangan froude yang kurang dari 0,4 maka termasuk dalam regime aliran rendah. Beberapa perlakuan yang telah dicoba pada model yaitu:pemasangan krib sebanyak 10 di hulu dan 5 di hilir jembatan, pemasangan krib sebanyak 20 di hulu dan 2 di hilir jembatan, pengerukan pada section A7 – A0 dibagian belokan sungai, pemasangan krib sebanyak 3 di hulu jembatan dan pengerukan pada section A7 – A0. Dari hasil analisis yang telah dilakukan, diketahui bahwa kondisi aliran di Sungai Barito menyebabkan dampak tergerusnya tebing sungai sepanjang belokan luar, sehingga mengakibatkan perubahan dasar sungai dan tebing sepanjang belokan luar yang mempengaruhi keamanan pada jembatan Sungai Barito dan kelancaran transportasi sungai yang ada. Diperlukan penanganan khusus untuk memperbaiki kondisi tersebut. alternatif yang terpilih dari beberapa variasi penelitian yang telah dilakukan yaitu -pengerukan Section A7 – P3 dibagian kiri sungai lebar 25 cm (model) = 50 m (prototype) -pemasangan Krib permeable dengan sudut 150 terhadap tebing panjang 25 cm (model) = 50 m (prototype) jarak 50 cm (model) = 100 (prototype) sebanyak 3 di hulu jembatan
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
Analisis Banjir pada Polder Sunter Timur II dengan Menggunakan HEC-RAS (Ras Mapper)
Full text linkAbstrak Banjir di Jakarta menimbulkan kerusakan dan kerugian, menjadi latar belakang dilakukannya analisis banjir di Polder Sunter Timur II yang disajikan dalam makalah ini. Wilayah hilir Jakarta terbagi menjadi 43 sistem polder dan salah satunya adalah Polder Sunter Timur II. Studi ini bertujuan untuk mendapatkan luas daerah banjir rencana Polder Sunter Timur II. Analisis hidrologi menggunakan software HEC-HMS dan analisis banjir menggunakan HEC-RAS (Ras Mapper). Data input yang digunakan dalam pemodelan yaitu Digital Elevation Model (DEM), hidrograf, peta penggunaan lahan. Daerah tangkapan air polder Sunter Timur II sebesar 1,328 km2. Hasil simulasi HEC-HMS didapat debit banjir rencana kala ulang 5, 10 dan 25 tahun yaitu sebesar 185 m3/dt, 208,7 m3/dt, 234,3 m3/dt. Hasil simulasi HEC-RAS menunjukkan luas daerah banjir dengan debit banjir kala ulang 5, 10 dan 25 tahun adalah 857,08 Ha, 885,62 Ha, 979,59 Ha. Kata kunci: banjir, sistem polder, analisis hidrologi, HEC-HMS, HEC-RAS Abstract Flood in Jakarta cause damage and losses are the reason for flood analysis of the East Sunter II Polder presented in this paper. Downstream area of Jakarta is divided into 43 polder systems and one of them is East Sunter II Polder. This study aims to obtain the flood area of Polder East Sunter II plan. Hydrological analysis using HEC-HMS software and flood analysis using HEC-RAS (Ras Mapper). Input data used in modeling are Digital Elevation Model (DEM), hydrograph, land use map. Catchment area of the East Sunter II polder is 1,328 km2. The result of HEC-HMS, for 5-, 10- and 25-year return period flood discharge is 185 m3/s, 208,7 m3/s, 234 m3/s. The results of HEC-RAS show that the flood area with 5, 10 and 25-year return period flood discharge is 857,08 Ha, 885,62 Ha, 979,59 Ha. Keywords: flood, polder system, hydrology analysis, HEC-HMS, HEC-RA
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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