Mathematics is frequently thought as a hard course by students because of some reasons. One of the reasons is that students cannot visualize the material given by their teacher. On the other hand, only a few numbers of teachers who can explain the course using appropriate figures. Moreover, during a presentation or making a quiz, they cannot present those things very well which confused the students further. Facing this challenge, therefore, we organized a training to enhance the Mathematics teachers’ competency in Balikpapan City so they could attract students’ attention and improve comprehension by giving the right visualization. In this training, we used GeoGebra, which is an open-source program and user-friendly. For the result, this training performed that the participants then could graph some functions, construct a 3-D space, and make a presentation using GeoGebra.
Rudder adalah perangkat untuk mengubah arah kapal dengan mengubah arah arus air yang mengakibatkan manuver pada kapal. Rudder ditempatkan diujung belakang lambung kapal/ buritan belakang baling-baling. Jenis umumnya banyak dipakai adalah tipe konvensional namun adapun jenis rudder selain jenis konvesional, yaitu jenis fishtail. Penelitian ini bertujuan untuk menganalisa perbedaan performa antara rudder konvensional dan rudder fishtail terhadap nilai Drag Force dan Lift Force. Metode yang digunakan adalah persamaan Clark dengan bantuan aplikasi berbasis CFD untuk mengetahui performa yang dihasilkan pada saat kapal Drag Force dan Lift Force dengan memvariasikan sudut belok 5°, 10° dan 35°. Hasil penelitian didapatkan rudder konvensional memiliki tingkat keefektivitas drag force dan coefficient drag yang lebih baik dibandingkan rudder fish tail, sedangkan pada rudder fish tail memiliki tingkat memiliki tingkat keefektivitas lift force dan coefficient lift yang lebih baik dibandingkan rudder konvensional.
AbstrakDi Indonesia, proses pengiriman batubara dengan kapal tongkang banyak dijumpai karena kemudahan aksesnya dimana kapal tongkang memiliki sarat air (draft) yang lebih kecil dibandingkan dengan jenis kapal lain. Penelitian ini mencoba menentukan hambatan pada kapal tanpa awak berbentuk kapal tongkang untuk beberapa kecepatan menggunakan metode CFD dengan program OpenFOAM. Metode ini mendiskritisasi persamaan Navier Stokes dengan menggunakan pendekatan metode volume hingga. Kapal tongkang digambar menggunakan perangkat lunak Maxsurf modeler sebelum diintegrasikan kedalam program CFD. Diskritisasi dilakukan dengan memastikan area sekitar lambung kapal terdiskritisasi cukup rapat. Hasil penelitian menunjukan bahwa Hambatan pada kapal tongkang berkisar antara 39.39kN-227.963kN untuk kecepatan 3-9knot.
AbstractIn Indonesia, the process of coal shipping with barges is prevalent due to the fact that barges have smaller draft compared to other vessels; The research was aimed to determine the resistance of a barge as an autonomous vehicle utilizing CFD method in OpenFOAM program. The method discretize Navier Stokes equations using finite volume method. The barges was drawn by virtue of Maxsurf modeler before integrated into the CFD program. The discretization should ensure that the vicinity of the ship was discretization adequately. The result shows that barge resistance is ranging at 39.39 kN -227.963 kN at velocity 3-9 knots.
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