Judul: Consumer’s Preference on Chicken Meat in Bengkulu Selatan Regency
Abstrak: Selera dan preferensi masyarakat Bengkulu Selatan terhadap daging unggas akan meningkat bersamaan dengan peningkatan jumlah penduduk dan pendapatan, peningkatan sektor ekonomi, dan perkembangan ilmu pengetahuan dan teknologi. Penelitian ini bertujuan mengetahui pendapat dan preferensi konsumen dalam memilih daging ayam di Kabupaten Bengkulu Selatan. Data diperoleh dari 190 responden berdomisili di Kabupaten Bengkulu Selatan yang pernah membeli daging ayam. dst .., The tastes and preferences of people in South Bengkulu towards poultry meat will increase along with incrase of population and income, increase in economic sector, and development of science and technology. This study aimed to describe the opinions and preferences of consumers in choosing chicken meat in the South Bengkulu Regency. The data were obtained from 190 respondents in Bengkulu Selatan Regency and had bought chicken meat. The data was analysed descriptively by showing tables and figures and analyzed using the Chi-square test (X2) to determine the relationship between the characteristics of respondents and buying behaviour and consumer opinion of chicken meat. The results of the study reported a significant relationship (p < 0.05) between age, gender, occupation, and educational background and frequency of purchase, place of purchase, purpose of purchase, and consumer opinion of chicken meat in Bengkulu Selatan. The criteria for halal-cut chicken was the respondent's first preference in choosing chicken meat, followed by fresh chicken, clean chicken, low-priced chicken, and cold chicken.
Keyword: chicken meat, consumer’s opinion, consumer’s preference

Judul: Consumer Preference for Chicken Meat in East Lombok District
Abstrak: Peningkatan pendapatan, pengetahuan, dan kesadaran akan kesehatan mendorong peningkatan pembelian pangan sumber protein hewani seperti daging ayam. Penelitian ini bertujuan mengidentifikasi minat dan alasan konsumen tidak membeli daging ayam dingin atau beku, serta pendapat dan preferensi konsumen terhadap daging ayam di Kabupaten Lombok Timur. Data diperoleh dari 400 responden yang berdomisili di Kabupaten Lombok Timur. Penyajian data dilakukan menggunakan Microsoft Excel dan hubungan antara karakteristik responden dengan pendapat diperoleh melalui analisis data menggunakan metode Chi-square. Hasil penelitian menunjukkan bahwa sebagian besar responden (86,17%) membeli daging ayam dingin atau beku 1-2 kali dalam sebulan, dengan kuantitas sebagian besar (42,55%) 0-0,25 kg dalam satu kali pembelian, dan lokasi pembelian di kios rumahan (41,49%). Mayoritas responden (76,50%) tidak pernah membeli daging ayam dingin atau beku karena daging ayam dingin atau beku dianggap berbahaya. Penelitian ini menemukan hubungan yang signifikan (p-value < 0,05) antara usia responden dengan pendapat responden. Preferensi konsumen dalam pembelian daging ayam adalah daging yang dipotong secara baik dan halal., The demand of chicken meat increases because the increase of income, knowledge, and awareness of health. This study aimed to identify consumer interests and reasons did not buy chilled or frozen chicken meat, as well as consumer opinions and preferences towards chicken meat in East Lombok District. Data was obtained from 400 respondents in East Lombok District. The data was analyzed using Microsoft Excel and the relationship between the characteristics of respondents and opinions was analyzed using the Chi-square method. The result showed that most respondents (86,17%) purchased chilled or frozen chicken meat 1-2 times in a month, most half (42,55%) of respondents purchased of 0-0,25 kg in one purchase, and the location of purchase at kios in home (41,49%). The majority of respondents (76,50%) never bought chilled or frozen chicken meat because chilled or frozen chicken meat was considered dangerous. This study found a significant relationship (p < 0.05) between the age of respondents with respondents' opinions. Consumer preferences in the purchase of chicken meat were halal.
Keyword: East Lombok District, preference

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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