Judul: Consumers Preverence on Chilled/Frozen Chicken Meat in South Sumedang District
Abstrak: Chicken meat is one the protein source for human body. Application of chilling and freezing temperature to the meat could maintain the quality of the meat and extend the storage time. The purpose of this research was to identify activity of respondents in purchasing chilled/frozen chicken meat, opinion of respondents on chilled/frozen chicken meat, preference of respondents on chilled/frozen chicken meat, relation between characteristics of respondents and purchase activity on chilled/frozen chicken meat, and relation between characteristics of respondents and opinion on chillec/frozen chicken meat in Subdistrict of South Sumedang, District of Sumedang. Determination of the samples was carried out by using the non-probability sampling method. The data was analyzed descriptively and the relation of the characteristics of respondents with the purchase activity and opinion was analyzed using the chi-square test (χ2). The result of this study showed that the majority of respondents were women (73,0%), with bachelor’s degree (56,4%) and working as civil servants (24,0%). Half of respondents have purchased chilled/frozen chicken meat (57,0%). Halal was the first preference of respondents (89,0%) that was followed by clean and odorless meat (85,0%). There was no significant relationship (p > 0,05) between characteristics of respondents and purchase activity and opinion of respondents on chilled/frozen chicken meat., Daging ayam merupakan salah satu sumber protein bagi tubuh manusia. Penerapan suhu dingin dan beku pada daging mampu mempertahankan kualitas daging dan memperpanjang masa simpan. Penelitian ini bertujuan mengkaji preferensi konsumen, pendapat konsumen, dan menganalisis hubungan karakteristik konsumen dengan preferensi dan pendapat konsumen terhadap daging ayam dingin/beku di Kecamatan Sumedang Selatan, Kabupaten Sumedang pada tahun 2022. Penentuan sampel yang digunakan yaitu penarikan contoh tak berpeluang atau metode non-probability Sampling. Analisis data yang digunakan pada penelitian ini adalah metode analisis deskriptif dan analitis. Hubungan antara karakteristik dan pendapat konsumen terhadap daging ayam dingin/beku pada penelitian ini dianalisis secara analitis menggunakan uji chi-square (χ2). Hasil penelitian menunjukkan bahwa mayoritas responden adalah perempuan (73,0%), berpendidikan S1 (56,4%) dan bekerja sebagai aparatur sipil negara (24,0%). Separuh responden pernah membeli daging ayam beku/dingin (57,0%). Halal adalah pilihan pertama responden (89,0%) diikuti oleh daging yang bersih dan tidak berbau (85,0%). Tidak ada hubungan yang signifikan (p > 0,05) antara karakteristik responden dengan aktivitas beli dan pendapat responden terhadap daging ayam beku/dingin.
Keyword: non-probability sampling, chicken meat, chi-square test

Judul: Consumer's Preference on Purchasing Chicken Meat in the Buayan Subdistrict, Kebumen District Wet Market
Abstrak: Daging ayam merupakan salah satu sumber pangan hewani yang memiliki kandungan gizi tinggi dan banyak digemari masyarakat dibandingkan dengan daging ruminansia atau unggas lainnya. Dalam upaya meningkatkan konsumsi daging ayam maka diperlukan adanya data mengenai preferensi konsumen. Penelitian ini dilaksanakan di dua pasar tradisional di Kecamatan Buayan, Kabupaten Kebumen, Provinsi Jawa Tengah, yaitu: Pasar Karangbolong dan Pasar Rangkah. Penelitian dilakukan dengan wawancara langsung kepada konsumen daging ayam di pasar tradisional menggunakan kuesioner yang telah disusun secara terstruktur. Data dianalisis secara deskriptif dan dianalisis hubungan antara karakteristik dan preferensi atribut daging ayam, preferensi jenis daging, dan pendapat konsumen terhadap daging ayam dingin. Hasil penelitian menunjukkan bahwa atribut yang lebih diutamakan konsumen saat membeli daging ayam secara berurutan ialah halal, kualitas/mutu, harga, dan besar daging. Jenis daging ayam yang lebih disukai konsumen ialah daging ayam segar atau daging ayam baru dipotong, sedangkan daging dingin/beku menjadi daging yang kurang disukai konsumen dan sebagian besar konsumen memiliki pendapat yang buruk terhadap daging tersebut. Hasil penelitian menunjukkan adanya hubungan yang nyata antara tingkat pendidikan dengan preferensi atribut daging ayam., When compared to ruminant or other poultry meat, chicken meat is one of the more nutritious foods that many people prefer. To increase chicken meat consumption, data on consumer preferences for chicken meat is required. This research was carried out in two wet markets in Buayan Subdistrict, Kebumen District, Central Java Province namely Pasar Karangbolong and Pasar Rangkah. Structured questionnaires and in-person interviews with chicken meat consumers in traditional wet markets were used to make the assessment. The data were descriptively analyzed, and the relationship between respondent characteristics and preference for chicken meat attributes, preference for chicken meat type, and consumer opinion on chilled chicken meat was investigated. According to the study, consumers prioritized halal, quality, price, and meat size when purchasing chicken meat. Consumers preferred fresh chicken meat, freshly slaughtered chicken meat, or hot carcass. Meanwhile, chilled/frozen meat was less preferred by consumers, and most consumers had negative attitudes toward chilled/frozen chicken meat. The study also revealed a significant relationship between education level and preference for chicken meat criteria.
Keyword: chicken meat, consumer, criteria, preference, wet market

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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