Judul: Pencemaran Salmonella sp. dalam Daging Ayam Beku yang Dilalulintaskan Melalui Pelabuhan Penyeberangan Merak
Abstrak: This study aims to determine the presence of Salmonella sp. as a safety indicator on frozen chicken meat transported through Merak port. This study used 53 samples of frozen chicken meat from Jakarta, Bekasi, Bogor, and Serang. The number of the samples 16, 11, 8, and 18 respectively. Two samples from Serang (3.77% of 53 samples) are found positive Salmonella sp., while from Jakarta, Bekasi and Bogor are negative. Total percentage samples from Serang positive Salmonella sp. is 11.1% of 18 samples. Based on SNI 01-7388-2009 about the Maximum Contaminant Limit of Microbes in the food, the presence of Salmonella sp. in frozen chicken meat should be negative.
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Judul: Keberadaan Salmonella pada Daging Ayam yang Dijual di Pasar Tradisional di Kota Tangerang Selatan
Abstrak: This study was aimed to observe the presence of Salmonella in chicken meat sold in traditional markets in South Tangerang City. This research was conducted with survey method by interview the vendors of chicken meat as respondents, observation of markets condition using check-list, and sampling the chicken meat for Salmonella test. Total of 24 chicken meat samples was taken from three traditional markets, i.e., Modern Market, Bukit Market, and Jombang Market. The presence of Salmonella was performed using the isolation and identification test based on the Indonesian National Standard Number 2897:2008. The study showed that the Modern Market had the best criteria on the hygiene aspects compared to the other markets. The presence of Salmonella in chicken meat samples was 33.3% from Jombang Market (1 of 3 samples), 18.2% from Bukit Market (2 of 11 samples), and 10% from Modern Market (1 of 10 samples), with the total percentage of 16.7% (4 of 24 samples). The presence of Salmonella in chicken meat is associated with bad personal hygiene practices and the lack of cold chain from slaughterhouses to the markets. This condition requires attention from the government since Salmonella is the important foodborne pathogen that can threat the public health
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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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