1,720,966 research outputs found
Evaluasi Kinerja Operasional Jalur Ganda Kereta Api Antara Bojonegoro – Surabaya Pasarturi,
No full textPembangunan jalur ganda lintas utara Jawa antara Bojonegoro – Surabaya Pasarturi selesai dilaksanakan dan dioperasikan tahun 2014. Panjang jalur ganda antara Bojonegoro – Surabaya Pasarturi adalah 105 km dan total panjang jalur ganda lintas utara Jawa dari Jakarta hingga Surabaya adalah 727 km dan terdiri dari 15 stasiun. Realisasi angkutan kereta api dari tahun ke tahun semakin meningkat dan besarnya target angkutan penumpang dan barang yang telah ditetapkan oleh pemerintah dalam RIPNas. Sehingga perlu dilakukan evaluasi terhadap kinreja operasional jalur ganda, terutama dari sisi kapasitas lintasnya. Pada penelitian ini dilakukan perhitungan kapasitas lintas secara analitis menggunakan rumus umum perhitungan kapasitas lintas yang betujuan untuk mengetahui kapasitas lintas eksisting jalur ganda kereta api antara Bojonegoro – Surabaya Pasrturi. Setelah itu dilakukan perhitungan perkiraan frekuensi kereta api tahun 2018, 2025 dan 2030. Metode SWOT dilakukan untuk mendapatkan strategi-strategi yang dapat dilakukan untuk meningkatkan kapasitas lintas jalur ganda kereta api. Hasil dari SWOT dilakukan simulasi-simulasi untuk mengetahui kapasitas lintas jalur ganda kereta api tahun 2018, 2025 dan 2030. Hasil perhitungan kapasitas lintas eksisting jalur ganda kereta api masih mencukupi dalam menampung jumlah frekuensi kereta api yang berjumlah 50 KA/hari dengan level of service (LoS) B. Berdasarkan hasil dari analisa SWOT, didapatkan strategi untuk meningkatkan kapasitas lintas yaitu meningkatkan kecepatan kereta api, memperpendek jarak antar stasiun/menambah petak blok dan mengganti sistem persinyalan. Hasil simulasi menunjukkan bahwa dengan meningkatkan kapasitas lintas jalur ganda kereta api, perkiraan frekuensi kereta api tahun 2018, 2025 dan 2030 dapat ditampung dengan level of service (LoS) C. Sehingga dalam melakukan peningkatan kapasitas lintas dapat dilakukan dengan tahapan yaitu meningkatkan kecepatan rata-rata kereta api, memperpendek jarak antar stasiun/menambah petak blok dan mengganti sistem persinyalan
Analisa Kemampuan Balok Underreinforced Concrete Yang Diperbaiki Dengan Metode Epoxy Injection
Full text linkDalam dunia konstruksi, crack (retak) merupakan permasalahan yang sering terjadi. Retak tersebut disebabkan oleh beberapa hal, diantaranya kesalahan perencanaan, umur bangunan serta beban yang berlebih (over load). Apabila retka tersebut dibiarkan begitu saja dan tidak ada usaha untuk menutupnya maka akan menyebabkan menurunnya kinerja dalam memikul beban. Metode injeksi merupakan salah satu cara untuk menutup/mengisi keretakan-keretakan yang terjaadi pada struktur, agar struktur dapat berfungsi sesuai perencanaan. Pengujian eksperimental dilakukan terhadap balok kondisi underreinforced dengan variasi mutu beton <fc) 25, 30, 35 Mpa dan masing-masing mutu beton dibuat tiga buah balok. Sebanyak 2 balok dari masing-masing mutu beton dites lentur dengan thirdpoint loading sampai ultimate. Retak-retak yang terjadi baik itu retak lentur maupun retak geser diperbaiki (repair) dengan metode injeksi. Untuk menginjeksi retakan pada balok menggunakan bahan Sikadur 752. setelah itu benda uji balok dites lagi dan dibandingkan dengan benda uji yang tidak direpair. Hasil pengujian menunjukkan bahwa ada peningkatan daktilitas dari balok yang direpair dibandingkan dengan balok yang tidak direpair. Balok dengan mutu beton (fc) 25 MPa, Benda uji A daktilitasnya meningkat 43.89 %, benda uji B meningkat 43.92 %. Balok dengan mutu beton (f c) 30 MPa, benda uji A daktilitasnya meningkat 41.12 %, benda uji B meningkat 33.52 % dan balok dengan mutu beton (f c) 35 MPa, benda uji A daktilitasnya meningkat 30.10 %, benda uji B meningkat 32.92 %. Selain daktilitas, repair juga menyebabkan meningkatnya energi disipasi (AE) dari balok. Balok dengan mutu beton (fc) 25 MPa nilai disipasi benda uji A meningkat 30.623%, benda uji B meningkat sebesar 30.04%. Balok dengan mutu beton (f’c) 30 MPa nilai disipasi benda uji A meningkat 24.34 %, benda uji B meningkat sebesar 19.224 % dan Balok dengan mutu beton (f’c) 35 MPa nilai disipasi benda uji A meningkat 55.71%, benda uji B meningkat sebesar 58.486%
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In the world of construction, cracks are a common problem. The cracks are caused by several things, including planning errors, the age of the building and overload. If the crack is left alone and there is no effort to close it, it will cause a decrease in performance in carrying the load. The injection method is one way to close/fill the cracks that occur in the structure, so that the structure can function according to plan. Experimental tests were carried out on underreinforced beams with variations in concrete quality <fc) 25, 30, 35 MPa and three blocks were made for each concrete quality. A total of 2 beams of each concrete quality were tested for flexure with third-point loading to ultimate. Cracks that occur, both flexural cracks and shear cracks, are repaired using the injection method. Sikadur 752 was used to inject cracks into the beam. After that, the beam specimen was tested again and compared with the unrepaired specimen. The test results show that there is an increase in the ductility of the repaired beam compared to the unrepaired beam. Beams with concrete quality (fc) 25 MPa, specimen A increased ductility 43.89 %, specimen B increased 43.92 %. Beams with concrete quality (f c) 30 MPa, specimen A ductility increased 41.12%, specimen B increased 33.52% and beams with concrete quality (f c) 35 MPa, specimen A increased ductility 30.10%, specimen B increased 32.92%. Besides ductility, repair also causes an increase in energy dissipation (AE) of the beam. For beams with concrete quality (fc) 25 MPa, the dissipation value of specimen A increased by 30.623%, specimen B increased by 30.04%. Beams with concrete quality (f'c) 30 MPa dissipation value of specimen A increased by 24.34%, specimen B increased by 19.224% and beams with concrete quality (f'c) 35 MPa dissipation value of specimen A increased by 55.71%, specimen B increased by 58.486
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
Identification Damage of Rail Bridge Components Using Drone
Full text linkEvery railway infrastructure must be inspected to determine its condition and function, including railroad bridge. The current inspection method is still carried out manually, namely by directly inspecting the components of the railway infrastructure, of course, this will make the inspection time long. Inspection of bridge components in locations that are difficult to reach can use tools such as Unmanned Aerial vehicles (UAV) or Drones. This study aims at bridge components, damaged bridge components and the type of damage that occurs on Welded Through Truss (WTT) bridges. Video results obtained from drones were analyzed based on PM 31/2011 and PM 32/2011. The results of the analysis found that the damage that occurred was on the stringer, floor beam and top lateral bracing with the type of damage, namely corrosion/rust that occurred in all spans of the bridge. The underside of the bridge is still in good condition.Setiap prasarana perkeretaapian harus dilakukan pemeriksaan untuk mengetahui kondisi dan fungsinya, tidak terkecuali pada prasarana jembatan kereta api. Metode pemeriksaan saat ini masih dilakukan secara manual, yaitu melakukan pemeriksaan secara langsung terhadap komponen- komponen prasarana perkeretaapian, tentunya hal ini akan membuat waktu pemeriksaan menjadi lama. Pemeriksaan komponen-komponen jembatan pada lokasi yang sulit dijangkau dapat menggunakan alat bantu seperti Unmanned Aerial Vehicle (UAV) atau Drone. Penelitian ini bertujuan untuk komponen jembatan, komponen jembatan yang mengalami kerusakan serta jenis keruksakan yang terjadi pada jembatan kereta api dinding rangka tertutup. Hasil video yang didapat dari drone dianalisis berdasarkan PM 31/2011 dan PM 32/2011. Hasil analisis didapatkan bahwa kerusakan yang terjadi yaitu pada komponen rasuk pokok atas dan ikatan angin atas dengan jenis kerusakan yaitu korosi/karat yang terjadi pada semua bentang jembatan. Bagian bawah jembatan masih dalam kondisi bagus
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