1,720,961 research outputs found
Reservoir Sedimentation Volume Changing Analysis of Pangsar Soedirman Dam Through USLE Based Rainfall Characteristics
Get PDFThis research aims to analyse the reservoir sedimentation volume changing of Pangsar Soedirman Dam at Banjarnegara regency through rain erosivity and erosion analysis using universal soil loss equation (USLE) method. The catchment area of Pangsar Soedirman Dam reservoir has rainfall ranging from 1,500 - 5,500 mm/year. In 1989 and 1993, rainfall which has ranging from 3,000 - 5,500 mm/year did not make any increase of reservoir sedimentation volume. In contrast, with rainfall 1,500 mm/year in 1998, the reservoir sedimentation volume reached 6 million m3. Similarly, with rainfall 5,500 mm/year in 1999, the reservoir sedimentation volume decreased from 6 million m3 to about 4 million m3. These results show that the characteristics of rainfall in the catchment area do not always contribute to the increase of sedimentation volume in the reservoir but can also be influenced by other determinants other than rai
Pengaruh Meander dan Keamanan Lereng Terhadap Kejadian Longsor di Jalan Raya Prupuk-Bumiayu (km 115+50 – 115+900)
Get PDFPrupuk-Bumiayu road at Ciregol cross section (Km. 115+50-115+900) was 40 m head from Pedes River base and enclosed by Glagah and Pedes River.The research aim to study slope safety at Prupuk-Bumiayu road at Ciregol cross section. This study will focus to Fellinius Method with precipitaion influence and velocity consideration to avalanche calculation. The result of research shown that the slope safety at Prupuk-Bumiayu road at Ciregol cross section is 0,749<1 safety value, so must to be landslides land. Second, water discharge on current events, is 2,4 cubic meter per second, and so this value of water discharge not influence to landslides at Prupuk-Bumiayu road at Ciregol cross section
Studi Potensi Pembangkit Listrik Tenaga Mikro Hidro Di Sungai Brukah (Kali Bening, Banjarnegara)
Get PDFKabupaten Banjarnegara memiliki Daerah Aliran Sungai yang berpotensi untuk Pembangkit Listrik Tenaga Mikro Hidro (PLTMH). Topografi wilayah berbentuk perbukitan dengan beda tinggi aliran sungai cukup curam berpotensi dapat menghasilkan energi listrik. Salah satunya adalah Sungai Brukah yang berada di Kali Bening, Banjarnegara. Tulisan ini bertujuan untuk mengetahui potensi Sungai Brukah untuk Pembangkit Listrik Tenaga Mikro Hidro (PLTMH). Analisis dilakukan terhadap kapasitas debit, tinggi jatuh efektif aliran, dan potensi daya listrik yang dapat dihasilkan. Metode yang diterapkan dalam analisis debit sungai dilakukan melalui metode profil sungai (cross section), Analisis dilakukan melalui pengukuran penampang vertikal sungai (profil sungai) dan kecepatan aliran air. Sedangkan analisis daya dan energi dihitung berdasarkan analisis debit tersedia (Q) dan tinggi jatuh efektif (Heff) pada potongan memanjang sungai dengan mempertimbangankan efisiensi turbin dan generator. Hasil analisis menunjukkan bahwa debit rerata Sungai Brukah terhitung sebesar 1,59 m3/dt dengan tinggi jatuh efektif aliran 50 m dan diperkirakan dapat menghasilkan daya listrik sebesar 510,440 kW
Tinjauan Kejadian Keruntuhan Jembatan Kali Sapi Lama Berdasarkan Analisis Debit Kala Ulang
Get PDFJembatan Kali Sapi yang terletak di Desa Karanganyar Kecamatan Purwanegara, Banjarnegara, mengalami keruntuhan pada 24 Oktober 2010. Besar debit tercatat saat kejadian berlangsung adalah 50,15 m3/dtk dengan curah hujan tercatat mencapai 105 mm. Tujuan penelitian ini adalah untuk mengkaji kejadian keruntuhan jembatan Kali Sapi berdasarkan debit banjir kala ulang Sungai Kali Sapi. Perhitungan debit Banjir kala ulang pada penelitian ini menggunakan Metode Haspers, Metode Der Weduwen dan Metode Melchior. Hasil penelitian menunjukkan besar debit banjir kala ulang menggunakan Metode Haspers Q25 = 237,597 m3/dtk, Q50 = 260,055 m3/dtk dan Q100 = 282,347 m3/dtk. Pada Metode Weduwen Q25 = 274,520 m3/dtk, Q50 = 300,468 m3/dtk dan Q100 = 326,225 m3/dtk. Metode Melchior Q25 = 304,837 m3/dtk, Q50 = 333,651 m3/dtk dan Q100 = 362,251 m3/dtk. Selanjutnya berdasarkan umur rencana, jembatan Kali Sapi didesain dengan umur rencana 50 tahun. Berdasarkan metode Haspers, debit pada kala ulang 50 tahuan adalah 260,055 m3/dtk. Jika dibandingkan dengan besaran debit banjir saat kejadiaan ( 50,15 m3/dtk), maka keruntuhan jembatan bukan disebabkan oleh besaran debit banjir
RETRACTED: Pengaruh Faktor Panjang Kelerengan Terhadap Penentuan Awal Erosi Lahan
Get PDFAbstract
Berdasarkan hasil penyelidikan secara teliti dan hati-hati terhadap artikel "Pengaruh Faktor Panjang Kelerengan Terhadap Penentuan Awal Erosi Lahan" yang terbit pada JRST Vol 1 No. 2 September 2017.
Artikel ini ditemukan melanggar etika publikasi JRST
Artikel ini mengandung isi yang sama pada artikel di Jurnal SAINTEKS Vol 11 No. 2 th 2014 dengan link: http://jurnalnasional.ump.ac.id/index.php/SAINTEKS/article/view/141
Dokumen dan isinya telah dihapus dari JRST, dan upaya yang wajar harus dilakukan untuk menghapus semua referensi ke artikel ini
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
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