Judul: Pertumbuhan dan Produksi Tomat (Lycopersicon esculantum Mill.) Toleran Naungan pada Pola Tanam Tumpang Sari
Abstrak: Low light intensity is a limiting factor in the cultivation of intercropping. The purpose of this research was to study the effect of shade on growth and production of shade tolerant tomato in intercropping system. The treatments was conducted in IPB experimental farm in Cikabayan from February to June 2014. The treatments was arranged in randomized complete block design with three replications. The experiment consisted of 6 intercropping treatments, 3 monoculture of tomatoes (Rempai, Bogor, Palupi) and 2 monoculture of corn with 80 cm x 40 cm and 100 cm x 40 cm planting distance. The result showed that intercropping system decreased tomatoes plant growth and production, except Palupi which is increase on intercropping treatment than it’s monoculture. However, intercropping system doesn’t affected growth and production of corn. The intercropped of tomatoes and corn gave the land equivalent ratio (LER) = 1.56-3.60, indicating that agronomically intercropping system were more adventageous than those in the monoculture system.
Keyword: low light intensity, LER, Intercropping system, Bogor Agricultural University (IPB)

Judul: Pertumbuhan dan Produksi Tomat (Solanum lycopersicum Mill.) Toleran Naungan pada Sistem Tumpang Sari dengan Kacang Panjang
Abstrak: Intensitas cahaya rendah merupakan faktor pembatas dalam budidaya tumpang sari. Sejauh mana produktivitas tomat toleran naungan dapat digunakan dalam pola tanam tumpang sari belum banyak dipelajari. Tujuan penelitian ini adalah mempelajari pertumbuhan dan produksi tomat toleran naungan dalam pola tanam tumpang sari kacang panjang serta menghitung nisbah kesetaraan lahan. Penelitian ini dilaksanakan di Kebun Percobaan PKHT Ciomas Bogor pada bulan Maret sampai Juli 2016. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) dengan 3 ulangan. Perlakuan terdiri dari 6 tumpang sari, monokultur tomat Tora (peka), F7003008-1-12-10-3 (toleran) dan SSH 3 (senang), 2 monokultur kacang panjang dengan jarak tanam 70 cm x 50 cm dan 100 cm x 50 cm. Hasil penelitian menunjukkan bahwa pola tanam tumpang sari meningkatkan pertumbuhan dan produksi per tanaman tomat F7003008-1-12-10-3 dan SSH 3 kecuali tomat Tora. Pola tanam tumpang sari tidak mempengaruhi pertumbuhan dan produksi kacang panjang. Tumpang sari tomat-kacang panjang dapat meningkatkan produktivitas lahan dengan nisbah kesetaraan lahan antara 1.27-1.61. Hal ini menunjukkan bahwa secara agronomi penanaman tumpang sari tomat dengan kacang panjang lebih menguntungkan dibanding monokulturnya.
Keyword: naungan, nisbah kesetaraan lahan, tumpang sari

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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