Judul: Studi Antropometri Petani Dan Kesesuaiannya dengan Alat “Gebot” (Papan Perontok Padi) di Kecamatan Jetis, Kabupaten Ponorogo, Jawa Timur
Abstrak: “Gebot” is a tool to separate the grain from the stalk that has been harvested. This tools usually used by farmers for threshing rice. The purpose of this study was to identify the anthropometric of farmers in Jetis District, Ponorogo; ascertain the level of compliance of “gebot” tools to the farmer’s anthropometry; determine the appropriate dimension of the “gebot” tool which is match to the farmers anthropometry. Data retrieval is performed using a random sampling method to get the subject of 60 people, 50 measures of antropometric parameters which consists of 24 and 26 parameters of stand up and sit down position respectively. As the results, antropometric data of male and female were collected in 5th, 50th, and 95th percentiles. The correlation coeficient (CC), mean, and standard of deviation of each antropometric measures were collected as well based on the antropometric data and the “natural body movement range”. The “gebot” dimentional design was then analyzed. The results revealed that the optimum high of “gebot” for 5th, 50th, and 95th percentiles of the women operator are 56.0 cm, 58.1 cm, and 60.3 cm respectively. Whereas for the men operator are 61.0 cm, 62.8 cm, and 65.0 cm respectively for 5th, 50th, and 95th percentiles. The optimum slope of the “gebot” for 5th, 50th, and 95th percentiles of the woman operator are 530, 560, and 590. The optimum slope of the “gebot” for 5th, 50th, and 95th percentiles of the men operator are 610, 640, and 670.
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Judul: Antropometri petani pria dan aplikasinya pada desain tangkai cangkul: studi kasus di Kecamatan Dramaga, Kabupaten Bogor
Abstrak: Data base antropometri secara empiris sangat sedikit terutama untuk petani, padahal sebagian besar masyarakat Indonesia berprofesi sebagai petani, yang selalu menggunakan alat dan mesin pertanian. Menurut data BPS Kapubaten Bogor tahun 2008, dari 7652 KK di Kecamatan Dramaga, 6013 KK adalah rumah tangga yang berpenghasilan sebagai petani atau 78.58%-nya. Hal ini menunjukkan pentingnya pengukuran secara empiris antropometri petani di Kecamatan Dramaga dan mengaplikasikan antropometri untuk desain alat, dalam penelitian ini diaplikasikan pada desain tangkai cangkul agar dapat digunakan secara efektif, aman, dan nyaman. Tujuan penelitian ini adalah untuk mengetahui antropometri petani pria Kecamatan Dramaga dan menganalisa dan mendesain tangkai cangkul dengan menggunakan data antropometri yang telah diperoleh di lapangan.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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