Judul: Deteksi Residu Antibiotik pada Hati Itik Berasal dari Peternakan di Kabupaten Bogor
Abstrak: The research was aimed to detect the existence of antibiotic residue in ducks liver at poultry in Bogor District. There were 53 samples which were taken from 5 Sub-districts in Bogor District. The research was done by bioassay method. The result showed that antibiotic residue in ducks liver was detected positive (32.1%) from aminoglicoside and macrolide group. Antibiotic residue came from poultry in Ciomas Sub-district (29.4%), Gunung Sindur (11.8%), Jasinga (35.3%), and Jonggol (23.5%). Based on aminoglicoside group, it was 3.77% came from Jonggol Sub-district (12.5%), while tetrasiclin and penicilin was not found. In Klapanunggal Sub-district was detected negative antibiotic residue in the result of testing. Therefore, it is needed to control toward the excistence of antibiotics residue in order to guarantee the consumens health
Keyword: duck., bioassay method, antibiotic residue

Judul: Residu Antibiotik pada Pangan Asal Hewan di Kota Bogor Tahun 2015-2018 (Studi Kasus).
Abstrak: Residu antibiotik pada pangan asal hewan dapat menimbulkan berbagai dampak negatif, oleh karena itu Dinas Pertanian Kota Bogor setiap tahun melakukan pengawasan terhadap kejadian tersebut. Studi kasus ini dilakukan untuk mengevaluasi adanya residu antibiotik pada pangan asal hewan di Kota Bogor tahun 2015-2018. Data primer diperoleh dengan melakukan wawancara kepada Staf Dinas Pertanian Kota Bogor dan data sekunder diperoleh dari monitoring pangan asal hewan Dinas Pertanian Kota Bogor tahun 2015-2018. Analisis data dilakukan secara deskriptif. Kasus residu antibiotik tertinggi terdapat pada golongan makrolida (10), aminoglikosida (7), dan penisilin dan tetrasiklin (2). Kasus residu antibiotik terdapat pada susu sapi 20.0% (5/25), telur ayam 18.5% (5/27), daging sapi 13.6% (3/22), telur itik 10.0% (2/20), telur puyuh 5.2% (1/19), daging ayam 3.8% (1/26), dan yoghurt 100.0% (1/1). Kasus residu antibiotik golongan makrolida dan aminoglikosida cenderung meningkat pada tahun 2015-2017, akan tetapi menurun pada tahun 2018. Kasus residu antibiotik penisilin dan tetrasiklin cenderung menurun pada tahun 2015-2016, dan tidak ditemukan pada tahun 2017- 2018.
Keyword: Antibiotik, Kota Bogor, pangan asal hewan, residu antibiotik

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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