Judul: Analysis of Consumption and Consumer Perceptions on Beef Products at the Household Level in Pekalongan Regency
Abstrak: Kebutuhan masyarakat akan protein hewani seperti daging semakin meningkat sejalan dengan pertumbuhan penduduk. Akan tetapi, konsumsi rata- rata daging sapi di Indonesia masih tergolong sangat rendah, yaitu 2,56 kg / tahun. Tujuan penelitian ini adalah menganalisis faktor-faktor yang mempengaruhi tingkat konsumsi dan persepsi konsumen terhadap produk olahan daging sapi di Kabupaten Pekalongan. Sampel yang digunakan dalam penelitian ini adalah masyarakat Kabupaten Pekalongan dengan minimal usia 18 tahun. Penelitian ini dilakukan dengan cara wawancara menggunakan kuisioner yang disebar melalui sosial media. Data yang diperoleh diolah dengan metode regresi linier berganda. Hasil penelitian menunjukkan variabel usia, pendidikan, jumlah anggota keluarga, pendapatan dan harga berpengaruh terhadap konsumsi daging sapi. Namun demikian, variabel usia, pendidikan, jumlah anggota keluarga, pendapatan dan harga tidak berpengaruh terhadap konsumsi daging olahan dan daging matang. Persepsi konsumen terhadap daging sapi memiliki nilai rataan skor akhir sebesar 2,83, artinya seluruh variabel yang diujikan memiliki persepsi baik. Pengulangan pembelian daging sapi segar, daging sapi olahan dan daging sapi matang yang dilakukan oleh mayoritas responden adalah 1 bulan sekali. Mayoritas masyarakat juga lebih memilih membeli di pasar tradisional., People's need for animal protein such as meat is increasing in line with population growth. However, the average consumption of beef in Indonesia is still very low, at 2.56 kg/year. The purpose of this study was to analyze the factors that influence the level of consumption and consumer perceptions of processed beef products in Pekalongan Regency. The sample used in this study was the people of Pekalongan Regency with a minimum age of 18 years. This research was conducted by means of interviews using questionnaires distributed through social media. The data obtained were processed by the multiple linear regression method. The results showed that the variables of age, education, number of family members, income and prices had an effect on beef consumption. However, the variables of age, education, number of family members, income and prices do not affect the consumption of processed meat and cooked meat. Consumer perceptions of beef have an average final score of 2.83, meaning that all the variables tested have good perceptions. The majority of respondents buy fresh beef, processed beef and cooked beef once a month. The majority of people also prefer to buy in traditional markets.
Keyword: analisis konsumsi, daging sapi, konsumsi daging sapi, persepsi konsumen, beef, beef consumption, consumer perception, consumption analysis

Judul: Persepsi dan Perilaku Konsumen terhadap Pembelian Produk Daging Sapi di Kota Bekasi
Abstrak: Daging sapi merupakan sumber protein yang memiliki banyak manfaat sehingga sangat baik untuk dikonsumsi. Penelitian ini bertujuan mengidentifikasi karakteristik konsumen, menganalisis persepsi konsumen, serta mempelajari perilaku konsumen dalam membeli produk daging sapi mentah, daging sapi olahan, dan daging sapi matang di Kota Bekasi. Pengumpulan data dilakukan melalui pengisian kuesioner survei kepada 100 responden di Kota Bekasi serta dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa konsumen daging sapi di Kota Bekasi didominasi oleh perempuan, berusia 20-30 tahun dan berlatar pendidikan sarjana. Produk daging sapi sudah memiliki persepsi yang baik, artinya konsumen di Kota Bekasi sudah mengerti konsep produk daging sapi. Perilaku konsumen pada produk daging sapi mentah, olahan, dan matang memiliki frekuensi pembelian satu sampai dua kali sebulan dan satu sampai dua kali seminggu serta produk yang biasa dibeli berupa daging sapi segar dan bakso. Kandungan gizi, kebutuhan, dan kepraktisan menjadi faktor yang memengaruhi pembelian produk daging sapi.
Keyword: beef, consumer behavior, perception

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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