Majalah Ilmiah Bahari Jogja maritime, transportasi, manajemen, vokasi en-US (Ningrum Astriawati) (Ningrum Astriawati) Wed, 20 Jul 2011 00:00:00 +0000 OJS 60 The Influence Of Kalium Cromate Inhibitor On Corrosion And Fatique Crack Growth Of Aluminium Alloy 2024-T3 In The Sea Water Environment <p>Aluminium paduan seri 2024-T3 telah banyak diaplikasikan pada industri kapal laut karena memiliki ketahanan korosi yang relatif baik, tetapi rentan bila digunakan di lingkungan korosif seperti air laut. Untuk mengendalikan korosi banyak metode yang digunakan salah satunya dengan pemakaian <em>inhibitor</em>. Penelitian ini bertujuan untuk mempelajari pengaruh <em>inhibitor</em> kalium kromat (K<sub>2</sub>CrO<sub>4</sub>) dalam menurunkan laju korosi dan laju perambatan fatik pada Al 2024-T3.</p> <p>Pengujian laju korosi dengan menggunakan metode sel potensial tiga elektroda yang dilakukan di lingkungan air laut dengan menambahkan <em>inhibitor</em>, sementara itu untuk menguji laju perambatan fatik dengan menggunakan eksperimen fatik dengan stress rasio (R) = 0,1 dan frekuensi 15 Hz. Lingkungan korosi berupa air laut yang ditambahkan <em>inhibitor</em> K<sub>2</sub>CrO<sub>4</sub> dengan konsentrasi 0,1%; 0,3% dan 0,5%.</p> <p>Hasil penelitian menunjukkan bahwa peningkatan konsentrasi <em>inhibitor</em> K<sub>2</sub>CrO<sub>4</sub> cenderung menurunkan laju korosi dan mencapai kondisi minimal dan stagnants pada konsentrasi 0,5% sebesar 0,0134 mm/year (penurunan 38%), serta pada kondisi ini penurunan laju perambatan retak fatik (korosi fatik) terjadi pada ∆K rendah yaitu &lt; 15 MPa. m<sup>1/2</sup>.</p> Waris Wibowo, Mochammad Noer Ilman (Author) ##submission.copyrightStatement## Thu, 07 Feb 2019 00:00:00 +0000 Evaluasi Kualitas Hasil Praktek Las Busur Guna Menunjang Kerja Di Kapal <p>Research on cadets practicing objects is generally done visually, including the results of the practice of cadet welding at the Yogyakarta Maritime Academy, because the method is considered the most practical, but the method has not been able to reveal the quality of the results of the practice, especially related to mechanical properties and metal deposit. In connection with this, this study is to determine the quality of the results of the practice of arc welding, by doing tensile testing and macro testing. This research is a descriptive study with a research population of 40 objects from the practice of cadet arc welding, and a research sample of 50% of the population. Graduation of tensile testing, determined by comparing the tensile stress data. Minimum basic materials and welding materials. While the graduation of the macro test is determined by the presence or absence of defects in the metal deposit. The number of graduations from the two tests is published. In this study cadets can do the welding I connection with the results of fulfilling the graduation test requirement of 12 cadets or (60%), while cadets who can do welding I and T connections with the results of fulfilling the macro test graduation requirements, are as many as I connections 16 pieces (70%), while the T connection is 65%.</p> Prasetya Sigit (Author) ##submission.copyrightStatement## Thu, 07 Feb 2019 00:00:00 +0000 Penciptaan Nilai Logistik Pelabuhan di Indonesia <p><em>This paper highlights the creation&nbsp; of&nbsp; Indonesian ports logistics value, by review relevance journals. The finding are taht Indonesian ports faces problems, i.e policy concern to national logistics, transportation's infrastructure, availability of cargo, skill concern logistics. There are&nbsp; 3 (three) port&nbsp; logistics value : serial activity, pooled activity, and reciprocal activity.&nbsp;&nbsp; The activities of each actor in the port are getting better and better integrated. While there is no synchronization of&nbsp; flow of goods that enter and exit of the port.</em></p> Cahya Purnomo, Suyanti Suyanti (Author) ##submission.copyrightStatement## Thu, 07 Feb 2019 00:00:00 +0000 Evaluasi Kualitas Website Pemerintah Desa Sidoluhur Godean Berdasarkan Persepsi Pengguna <p>The aim of this study is to determine the relationship between the ideal level of expectations and the user's actual perceptions of the web quality services provided by the The Sidoluhur Godean Village, as well as providing solutions and managerial implications that can be planned to improve the quality of the website services. The method used to perform the evaluation through the integration of calculation webqual variables modifications approach within the framework of Structural Equation Modelling (SEM) and Importance Performance Analysis (IPA). This research, shows there is a positive and significant relationship among the variables of website service quality, satisfaction levels, and the intensity of system use. This relation forms the research conceptual model. The attributes that are necessary to get attention is the problem of updating information content, detailed information, user interaction security, image appropriation, font's suitability and speed time access to view website.</p> Fajar Nugroho, Bambang Soedijono, Armadyah Amborowati (Author) ##submission.copyrightStatement## Thu, 07 Feb 2019 00:00:00 +0000 Frase Standar Komunikasi Maritim Dalam Simulasi Komunikasi Berbahasa Inggris Di Atas Kapal <p>This article is a result of a research in which it belongs to a type of classroom action research. The research was done with the purpose to know how far Standard Maritime Communication Phrases might affect the ability of communication in English both for the purpose of internal and external communication on board vessel toward Nautical science cadets at Yogyakarta Maritime Academy academic year 2016/2017. This research used Kemmis and Mc.Taggart (1988) research approach where there were three main cycles which were preceded with one pre cycle and one post cycle during the research. Each cycles consisted of three meeting period which included the action of planning, conducting, observing, and reflecting. Those four steps were used to get to know the improvement achieved by the subject of the research regarding the usage of SMCP upon their communication ability on board vessel using English for the purpose of making internal and external communication on board. The result of the research showed that out of the&nbsp; four cycles conducted (pre cycle, cycle I, cycle II, cycle III) and post test known that there were significant improvement on the student’s ability of communication which was proven by score improvement they got in every cycle. Besides, the average score of the class also increased time by time and from one cycle to the next cycles. Hence, it is concluded that the use of SMCP might help cadets of Nautical science to increase their communication ability both in making internal and external communication on board vessel.</p> Sri Sartini, Lusina Arbety Junirwani (Author) ##submission.copyrightStatement## Thu, 07 Feb 2019 00:00:00 +0000