Judul: Tingkat Adopsi Teknologi Budidaya Sayuran Organik oleh Petani Mitra ADS-UF IPB Serta Faktor-Faktor yang Mempengaruhinya
Abstrak: Vegetables are one of the horticultural commodity that has great potential to be developed in Indonesia. Nowadays, it consumption trend in Indonesia leads to organic vegetables. This movement caused by public awareness about the dangers of using chemical product for health and environment. The farmers who conducted organic farming must adopt various organic cultivating aspects in order to reach organic harvest. Agribusiness Development Station (ADS) is an institution that encourage its partnered farmers to cultivate organic vegetables by adopting cultivating technologies formed in SOP. The purpose of the research is to identify characteristics of farmers, to analyze farmer’s adoption rate of the technology of organic vegetables cultivation, and to analyze factors that influence adoption. The result showed that, farmer’s adoption rate is high, 57.14 percent of farmer adopted the technology as recommended by SOP. Characteristic factors that give real effect based on the p-value in the level of α = 0.1 with logistic regression analysis is the level of education and farming experience.
Keyword: organic vegetable, farmer’s characteristics, cultivation, adoption

Judul: Faktor-Faktor yang Memengaruhi Petani Mengadopsi Padi Organik di Desa Pringkasap Kabupaten Subang
Abstrak: Pertanian organik tidak hanya solusi potensial untuk mengatasi masalah sistem pertanian konvensional dengan memberikan dampak positif pada kesehatan dan lingkungan tetapi juga untuk memenuhi permintaan yang terus meningkat akan pangan yang lebih sehat. Namun, permintaan pangan organik yang meningkat tidak direspon dengan peningkatan pasokan pangan organik yang berarti bahwa partisipasi petani dalam system pertanian organik masih rendah. Penelitian ini bertujuan untuk menganalisis tingkat adopsi dan faktor-faktor yang memengaruhi adopsi petani terhadap sistem pertanian padi organik. Penelitian ini menggunakan data primer dari 32 petani organik dan konvensional di Desa Pringkasap Kabupaten Subang. Data dianalisis menggunakan analisis deskriptif dan regresi logistik biner. Hasil penelitian menunjukkan bahwa tingkat adopsi budidaya padi organik di Desa Pringkasap saat ini masih rendah, yaitu hanya 16 petani dari 265 petani di Desa Pringkasap. Hasil penelitian juga menunjukkan bahwa jumlah tanggungan keluarga, pendidikan, luas lahan yang diusahakan, dan persepsi petani terhadap keunggulan relatif adalah faktor yang secara signifikan memengaruhi adopsi pertanian padi organik di Desa Pringkasap.
Keyword: tingkat adopsi, beras organik, pertanian organik, Pringkasap

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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