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: Growth and Production of Inpari 32 and Inpari 33 Rice Varieties with IPB 3S Variety Inserts In Multicanopy Cultivation System
Abstrak: Multikanopi padi merupakan teknik penanaman pada petak tanam yang sama menggunakan varietas dengan tinggi tanaman berbeda yaitu varietas pendek dan tinggi. Penelitian ini bertujuan mengkaji pertumbuhan dan produksi padi varietas Inpari 32 dan Inpari 33 dengan sisipan varietas IPB 3S pada sistem budidaya multikanopi. Penelitian dilaksanakan di Kebun percobaan BBPadi Sukamandi, Kecamatan Ciasem, Kabupaten Subang, Jawa Barat. Rancangan penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) faktorial dengan dua faktor yaitu varietas dan sistem budidaya. Faktor varietas meliputi Inpari 32 dan Inpari 33 dan faktor sistem budidaya meliputi multikanopi sisip 1, multikanopi sisip 2, dan monovarietas dengan 6 kali ulangan. Hasil penelitian menunjukkan bahwa terdapat interaksi pada peubah pengamatan jumlah anakan umur 6 Minggu Setelah Tanam (MST). Perlakuan varietas berpengaruh terhadap jumlah anakan, panjang malai, jumlah gabah per malai, dan bobot 1000 butir. Sedangkan perlakuan sistem budidaya berpengaruh terhadap jumlah anakan, fotosintesis, dan bobot kering malai. Hasil produksi tertinggi varietas Inpari 32 diperoleh menggunakan budidaya monovarietas (4,26 ton ha-1), sedangkan potensi hasil tertinggi pada varietas inpari 33 dengan budidaya multikanopi sisip 2 (9,55 ton ha-1)., Rice multicanopy is a planting technique on the same planting plot using different plant height varieties, namely short and tall varieties. This study aims to examine the growth and production of rice varieties Inpari 32 and Inpari 33 with the insertion by the IPB 3S variety in the multicanopy cultivation system. The research was carried out at the ICRR (Indonesian Center for Rice Research) Sukamandi, Ciasem District, Subang Regency, West Java. The design of this study used a facktorial complete randomized block design with two factors, namely varieties and cultivation systems. Variety factors include Inpari 32 and Inpari 33 and cultivation system factors include multicanopy insert 1, multicanopy insert 2, and monoculture with 6 replications. The results showed that there was an interaction in the observation of number of tiller at 6 weeks after planting (WAP). Varietal treatment affects the number of tiller, the length of the panicles, the amount of grain per panicle, and the weight of 1000 grains. Meanwhile, the treatment of the cultivation system affected the number of tiller, photosynthesis, and the dry weight of panicles. The highest yields of Inpari 32 varieties were obtained using monovariety cultivation (4.26 tons ha-1), while the highest yield potential in the Inpari 33 variety with multicanopy cultivation of insertion 2 (9.55 tons ha-1).
Keyword: Monovariety, Multicanopy, Varieties

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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