Judul: Efikasi Antibiotik D-1 terhadap Bakteri Escherichia coli dan Mycoplasma gallinarum pada Ayam Pedaging
Abstrak: Broilers is a superior breed that as cross breed chickens with high productivity. Productivity can be decreased due to the disease such as colibacillosis and mycoplasmosis. Antibiotics could support the productivity of chickens. The aims of the research is to determine the effectiveness of antibiotic D-1 against Escherichia coli and Mycoplasma gallinarum. Research was conducted from August 2, 2012 until August 24, 2012. Observations during research has been conducted including on body weight, morbidity and mortality of each cage after infections. The results showed that antibiotic D-1is more effective against Mycoplasma gallinarum than Escherichia coli. The right time to give the antibiotic D-1 to againt Escherichia coli is between 6 hours to 3 days post-infection, while for Mycoplasma gallinarum is 6 hours post-infection.
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Judul: Efikasi Antibiotik Berbahan Aktif Enrofloxacin terhadap Escherichia coli dan Mycoplasma gallinarum pada Ayam Pedaging
Abstrak: Broiler is a superior breed which has high productivity and shortly in productive period. The productivity of broiler may decline caused by diseases, such as colibacillosis and mycoplasmosis. Antibiotic treatment is one of the choise which can be done to prevent and treat the diseases. This research aims to know the efficacy of antibiotic containing Enrofloxacin against Escherichia coli and Mycoplasma gallinarum. This research was conducted on 1st August, 2012 until 24th August, 2012. The observation included morbidity, mortality, and body weight. The result of this research showed that this antibiotic is effective against Escherichia coli and Mycoplasma gallinarium. The appropriate time antibiotics application to the infected chickens is about six hours untill seven days post infection which has been proven to prevent the diseases effectively.
Keyword: Mycoplasma gallinarum, Escherichia coli, enrofloxacin, efficacy, broiler

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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