Judul: Response of Growth and Production of Inpari 32, Inpari  33, and Inpari 43 Varieties with IPB 3S Inserts in Multi-canopy Cultivation.
Abstrak: Budidaya multikanopi merupakan sistem budidaya tanaman padi dengan memanfaatkan dua karakter tinggi yang berbeda dalam satu lahan yang sama untuk meningkatkan produksi padi. Penelitian bertujuan mempelajari respon pertumbuhan dan produksi tanaman padi pada varietas Inpari 32, Inpari 33, dan Inpari 43 yang disisipkan IPB 3S pada budidaya multikanopi. Percobaan dilakukan di Kebun Percobaan Balai Besar Penelitian Tanaman Padi Sukamandi, Subang. Penelitian ini menggabungkan faktor varietas dan sistem budidaya padi dalam rancangan kelompok lengkap teracak (RKLT) faktorial dengan empat ulangan. Perlakuan varietas dengan menggunakan tanaman utama Inpari 32, Inpari 33, dan Inpari 43 serta IPB 3S sebagai tanaman sisipan. Sistem budidaya tanaman berupa sistem monovarietas, multikanopi sisip 1, dan multikanopi sisip 2. Hasil penelitian menunjukkan bahwa penggunaan varietas Inpari 32 dan penggunaan sistem monovarietas memberikan hasil yang terbaik dengan produktivitas sebesar 4,23 ton ha-1 . Respon pertumbuhan dan produksi tanaman padi dengan sisipan IPB 3S pada sistem budidaya multikanopi tidak dipengaruhi oleh interaksi antara varietas dan sistem budidaya kecuali pada umur berbunga tanaman.
Keyword: Growth, Multi-canopy, Production

Judul: Rice Growth and Production of Three Varieties of Inpari with Batang Piaman Variety inserts in Multicanopy
Abstrak: Peningkatan jumlah penduduk menyebabkan permintaan akan beras meningkat. Perlu dilaksanakan upaya peningkatan produksi padi untuk memenuhi kebutuhan padi nasional. Pengembangan inovasi sistem budidaya baru melalui sistem multikanopi merupakan salah satu upaya yang dapat dilakukan untuk meningkatkan produksi padi. Penelitian ini bertujuan mengkaji pertumbuhan dan produktivitas padi varietas Inpari 32, Inpari 33, dan Inpari 43 pada sistem budidaya multikanopi dengan sisipan varietas Batang Piaman. Penelitian dilaksanakan di lahan percobaan Balai Besar Tanaman Padi Sukamandi, Subang, Jawa Barat. Rancangan percobaan yang digunakan adalah Rancangan Lengkap Kelompok Teracak (RKLT) Faktorial dua faktor, yaitu varietas (Inpari 32, Inpari 33, dan Inpari 43) dan sistem budidaya (monokultur, multikanopi sisip 1, dan multikanopi sisip 2). Hasil penelitian menunjukkan varietas Inpari 43 dan sistem budidaya monokultur memiliki respon pertumbuhan dan produksi paling baik. Varietas, sistem budidaya, maupun interaksi keduanya tidak mempengaruhi produksi padi dalam gabah kering giling. Berdasarkan proyeksi hasil (tanpa gangguan hama), varietas Inpari 32 dengan sistem budidaya multikanopi sisip 2 menghasilkan produksi gabah kering giling tertinggi sebesar 8,93 ton ha-1., The increase in population caused increasing in demand for rice. It is necessary to increase rice production to meet national rice needs. The development new cultivation through a multi-canopy system is one of the efforts that can be made to increase rice production. This study aims to examine the growth and productivity of rice varieties Inpari 32, Inpari 33, and Inpari 43 in a multi-canopy cultivation system with the insertion of the Batang Piaman variety. The research was carried out in the experimental land of the Sukamandi Rice Research Center, Subang, West Java. The experimental design used was the Complete Design of the Randomized Group (RKLT) Factorial consisted of two factors, namely varieties (Inpari 32, Inpari 33, and Inpari 43) and cultivation systems (monoculture, multi-canopy insert 1, and multi-canopy insert 2). The results showed that the Inpari 43 variety under monoculture cultivation system had the best growth and production response. The variety, cultivation system, or interaction of them do not affect the production of dry milled grain rice. According to the yield projection (no damage by insect), the Inpari 32 variety with a multi-canopy insert 2 cultivation system resulted in the highest production of a dry milled grain of 8.93 tons of hectare.
Keyword: cultivation systems, inserts, production

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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