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    ANALISIS TERJADINYA SURGING PADA TURBOCHARGER GUNAKELANCARAN PENGOPERASIAN MESIN DIESEL GENERATOR DI MV. COSMO GLORIA

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    ABSTRAKSI Aditya, Tri Septa. 2025. “Analisis Terjadinya Surging Pada Turbocharger Guna Kelancaran Pengoperasian Mesin Diesel Generator Di MV.Cosmo Gloria”. Skripsi. Program Diploma IV, Program Studi Teknika, Politeknik Ilmu Pelayaran Semarang, Pembimbing I: Dr. Andy Wahyu Hermanto,S.T.,MT., Pembimbing II: Dr. Ali Muktar Sitompul, M.T, M.Mar.E. Turbocharger adalah komponen tambahan pada mesin yang berfungsi meningkatkan aliran massa udara yang masuk ke dalam silinder sehingga performa mesin bertenaga. Perawatan perlu dilakukan secara cermat dan mengikuti petunjuk yang tercantum dalam buku panduan. Namun, kerusakan pada turbocharger menyebabkan tekanan udara yang masuk kedalam silinder berkurang, yang menyebabkan surging pada turbocharger. Menurut pengalaman peneliti ditemukan masalah surging pada turbocharger generator terdengar suara mendengung yang sangat keras dari mesin diesel generator dan menurunya tekanan udara yang masuk ke dalam silinder. Tujuan penelitian adalah untuk mengetahui faktor penyebab, dampak terjadinya surging pada turbocharger mesin diesel generator guna kelancaran pengoperasian, serta upaya yang dapat dilakukan untuk mengatasi masalah tersebut. Penelitian ini menggunakan metode deskriptif kualitatif dengan teknik analisis data RCA (Root Cause Analysis) 5 why guna memperoleh hasil akar penyebab dari penelitian yang dilakukan. Dengan itu peneliti dapat lebih mudah menemukan akar masalah dari penyebab terjadinya surging pada turbocharger. Hasil penelitian menunjukkan bahwa surging pada turbocharger disebabkan bagian compressor side kotor, bagian turbine side kotor, kondisi beban yang salah dan air filter kotor serta dampak faktor tersebut yaitu compressor side kotor menyebabkan back pressure, menurunya tekanan udara didalam compressor side, tekanan udara didalam compressor side tidak stabil dan putaran compressor berat. Turbine side kotor menyebabkan back pressure, aliran exhaust gas tidak stabil dan putaran turbine dan tekanan exhaust gas rendah. Kondisi beban yang salah menyebabkan back pressure, aliran udara tidak stabil pada turbocharger, tekanan udara pada turbocharger rendah dan putaran (RPM) mesin tidak stabil dan air filter turbocharger kotor menyebabkan back pressure, tekanan udara didalam compressor side rendah, tekanan udara didalam compressor side tidak stabil dan aliran udara menuju turbocharger terhambat. Upaya untuk mengatasi surging pada turbocharger yaitu membersihkan bagian compressor side yang kotor, membersihkan bagian turbine side yang kotor, membagi beban generator (adjust load condition) dan mengganti air filter yang kotor. Untuk itu perlunya dilakukan pembersihan pada compressor side dan turbine side setiap minggu sebelum diesel generator dimatikan agar turbocahrger dalam keadaan baik dan normal

    Munculnya Gejala Surging Pada Turbocharger Mesin Diesel Generator Di Kapal MV. Cosmo Gloria

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    Turbocharger adalah komponen tambahan pada mesin yang berfungsi meningkatkan aliran massa udara yang masuk kedalam silinder dengan memanfaatkan energi dari gas buang sehingga dapat menambah performa mesin menjadi lebih bertenaga. Pada tanggal 28 Oktober 2023, terjadi surging pada Turbocharger mesin diesel generator yang menyebabkan penurunan tekanan udara menuju ruang bakar sehingga kinerja mesin diesel generator menjadi tidak optimal. Penelitian ini bertujuan untuk mengetahui faktor, dampak dan upaya menangani Turbocharger surging pada mesin diesel generator. Metode yang digunakan adalah deskriptif kualitatif melalui observasi, wawancara, dokumentasi dan studi pustaka. Menggunakan teknik analisis RCA (Root Cause Analysis) dengan metode 5 why. Hasil menunjukkan bahwa compressore side kotor, Turbine side kotor, kondisi beban yang salah (incorrect load condition) dan air filter kotor menjadi faktor penyebab terjadinya surging. dampak faktor tersebut yaitu Compressor side kotor menyebabkan back pressure, menurunya tekanan udara didalam compressor side, tekanan udara didalam Compressor side tidak stabil dan putaran compressor berat. Turbine side kotor menyebabkan back pressure, aliran exhaust gas tidak stabil dan putaran turbine dan tekanan exhaust gas rendah. Kondisi beban yang salah menyebabkan back pressure, aliran udara tidak stabil pada Turbocharger, tekanan udara pada Turbocharger rendah dan putaran (RPM) mesin tidak stabil dan air filter Turbocharger kotor menyebabkan back pressure, tekanan udara didalam Compressor side rendah, tekanan udara didalam Compressor side tidak stabil dan aliran udara menuju Turbocharger terhambat. Perbaikan dilakukan dengan membersihkan bagian compressor side, membersihkan bagian turbine side, membagi beban generator (adjust load condition) dan mengganti air filter yang kotor

    Going Beyond Counting First Authors in Author Co-citation Analysis

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    The 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

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    “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

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    We 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

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    We 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

    Author Index

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    koamabayili/VECTRON-author-checklist: VECTRON author checklist

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    We 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
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