Judul: Analysis of Youth Interest in Working as Farmers of Pamelo Oranges (Citrus maxima) in Tambakmas Village, Sukomoro Subdistrict, Magetan Regency
Abstrak: Desa Tambakmas merupakan desa sentra jeruk pamelo yang sebagian besar penduduknya bekerja sebagai petani jeruk pamelo. Petani jeruk pamelo didominasi berumur tua. Rendahnya minat pemuda terhadap pekerjaan sebagai petani jeruk pamelo dapat menghambat regenerasi petani dan keberlanjutan usahatani tersebut. Penelitian ini bertujuan untuk (1)menganalisis pendapatan usahatani jeruk pamelo di Desa Tambakmas, (2)menganalisis persepsi pemuda Desa Tambakmas terhadap pekerjaan sebagai petani jeruk pamelo, (3)menganalisis faktor-faktor sosial ekonomi yang memengaruhi minat pemuda Desa Tambakmas terhadap pekerjaan sebagai petani jeruk pamelo. Metode analisis data terdiri dari analisis pendapatan, skala likert, dan regresi logistik biner. Hasil analisis menunjukkan R/C ratio lebih dari satu dan rata-rata pendapatan usahatani jeruk pamelo menguntungkan, tetapi lebih rendah daripada UMK Kabupaten Magetan tahun 2021 dan 2022. Persepsi pemuda Desa Tambakmas setuju terhadap pekerjaan sebagai petani jeruk pamelo yang memiliki pendapatan positif, lingkungan kerja nyaman, membuka lapangan pekerjaan, meningkatkan status sosial, tidak merusak lingkungan, tetapi terdapat risiko dalam pengelolaannya. Faktor-faktor sosial ekonomi yang berpengaruh signifikan pada taraf nyata lima persen adalah jenis kelamin, status pernikahan, lama pendidikan, pendapatan orang tua, latar belakang pekerjaan orang tua pemuda, dan persepsi pemuda terhadap pekerjaan sebagai petani jeruk pamelo. Berdasarkan hal tersebut, diperlukan pelatihan dan manajemen risiko budidaya jeruk pamelo untuk meningkatkan minat pemuda., Tambakmas village is one of the pamelo oranges village where most of the residents work as pamelo orange farmers. Pamelo orange farmers in this village are dominated by old farmers. Some youths are not interested in working as pamelo orange farmers which constrains the regeneration and sustainability of pamelo oranges farming. This study aims to (1) analyze the income of pamelo orange farmers in Tambakmas village, (2) analyze the perception of the youth of Tambakmas village towards work as a pamelo orange farmers, (3) analyze of socio-economic factors that influence the interest of the youth of Tambakmas village towards work as a pamelo orange farmers. Data analysis methods are income analysis, likert scale, and binary logistic regression. The result of the analysis show that the R/C ratio is more than one and income average of pamelo orange farming is profitable, but lower than the UMK in Magetan Regency in 2021 and 2022.The youth of Tambakmas village have the perception of agreeing to work as a pamelo orange farmers, which is indicated by a positive value income, a comfortable work environment, creating jobs, increasing of social status, and not damaging the environment, but there are risks in its management. The factors of socio-economic that have a significant level of five percent are gender, marital status, length of education, parents income, the work background of the youth’s parents and the youth’s perception of work as a pamelo orange farmers. Based on this, training and risk management of pamelo oranges cultivation are needed to increase youth interest.
Keyword: binary logistics regression, farmer regeneration, income analysis, likert scale, youth perception

Judul: Analysis of  Factors Affecting Young Generation’s Interests in Working in Paddy Rice Farming (Case Study: Pamijahan Sub-District, Bogor Regency)
Abstrak: Kecamatan Pamijahan merupakan salah satu produsen padi terbanyak di Kabupaten Bogor. Kondisi petani di Kecamatan Pamijahan beberapa tahun terakhir mengalami perlambatan dalam hal regenerasi. Jika minat generasi muda untuk bekerja di pertanian menurun maka dapat berefek pada menyusutnya jumlah bahan pangan serta pertumbuhan perekonomian pada sektor pertanian. Penelitian ini bertujuan untuk: (1) menganalisis persepsi generasi muda di Kecamatan Pamijahan terhadap pekerjaan di usahatani padi sawah dan (2) menganalisis faktor-faktor yang memengaruhi minat generasi muda untuk bekerja di usahatani padi sawah. Metode yang digunakan dalam penelitian ini adalah analisis deskritif kuantitatif, dan regresi logistik. Hasil penelitian menunjukkan terdapat persepsi positif meliputi pendapatan dalam bertani dan peranan sektor pertanian, serta persepsi negatif meliputi risiko usaha dalam bertani dan kenyamanan kerja dalam bertani. Faktor-faktor yang berpengaruh signifikan terhadap minat generasi muda untuk bekerja di usahatani padi sawah adalah umur dan riwayat keluarga petani dengan pengaruh positif serta pendapatan keluarga dengan berpengaruh negatif., Pamijahan subdistrict is one of the largest rice producers in Bogor Regency. The condition of farmers in Pamijahan subdistrict in recent years has slowed down in terms of regeneration. If the interest of younger generation in agriculture is reduced then it can have an impact on the declining amount of food and economic growth in the agricultural sector. This study aims to: (1) analyze the perception of the younger generation in Pamijahan sub-district towards paddy rice farming and (2) analyze the factors that influence the interest of the younger generation towards paddy rice farming. The methods used in this research are quantitative descriptive analysis, and logistic regression. The results of the study shows that there are positive perceptions include income in farming and the role of the agricultural sector, and negative perceptions include business risks in farming, and work comfort in farming. Factors that have significant influences are age and family history of farmers with a positive influence, and family income with a negative influence.
Keyword: minat generasi muda terhadap sektor pertanian, regresi logistik biner, keputusan bekerja, pemuda pertanian, persepsi, skala likert, binary logistic regression, likert scale, perceptions, work decisions, youth

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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