Judul: Pengaruh Strangulasi Single dan Double terhadap Perbaikan Keragaan Bibit Jeruk Pamelo (Citrus grandis (L.) Osbeck).
Abstrak: The purpose of this research was to study the influence of single and double strangulation for stimulated vegetatif growth in order to improved canopy architecture of young pummelo seedling (Citrus grandis (L.) Osbeck). This research was conducted from March to September 2011 in green house of Cikabayan Experimental Station IPB, Darmaga. Biochemical analysis was done in Laboratory of Balai Penelitian Tanaman Obat dan Aromatik, Bogor and Post- Harvest Laboratory, IPB. The experiment was conducted in Completely Randomized Block Design one factor consist of 5 treatment there were control (T0), single strangulation (T1), double strangulation with distance between wire:5 cm (T2), 10 cm (T3) and 15 cm (T4). The experiment consisted of 5 replicates then there were 25 experimental units. Each experimental unit contained 2 plants and total crop are 50 plants. Strangulation treatment was done in May 19th and wires removed in August 10th 2011. The result of this research showed that single and double strangulation had significant response increase vegetatif growth to the numbers of scion diameter, numbers of leaf, volume of canopies, numbers of branch, total strarch in leaf than control. Double strangulation with distance between 2 wires 15 cm (T4) was the highest number of branch (5 branch), number of leaf (87.4 leaves) and had significant response increase starch of leaf.
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Judul: Peningkatan Pembungaan Jeruk Pamelo (Citrus grandis (L.) Osbeck) ‘Cikoneng’ Melalui Strangulasi
Abstrak: Untuk mengatasi masalah sifat berbuah musiman (alternate bearing) pada jeruk pamelo berbagai upaya perlu dilakukan baik rekayasa terhadap tanaman maupun lingkungan tumbuhnya melalui pengaturan suhu, stres air, panjang hari, ringing, membagi beban buah (penjarangan buah), pemangkasan dan pelatihan cabang, serta aplikasi zat pengatur tumbuh. Selain itu, mengatur pembungaan di luar musim dapat dilakukan dengan strangulasi. Strangulasi pada tanaman jeruk besar mampu merangsang tanaman untuk berbunga dan membentuk buah. Disamping itu, mengatur waktu strangulasi juga dapat meningkatkan laju induksi pembungaan. Penelitian bertujuan untuk mempelajari pengaruh tingkat pembuahan sebelumnya, letak dan waktu strangulasi terhadap peningkatan pembungaan jeruk pamelo ‘Cikoneng’. Penelitian dilaksanakan di lahan petani Desa Bantarmara, Kecamatan Cisarua, Kabupaten Sumedang, Jawa Barat dari bulan Agustus 2007 sampai April 2008. Analisis laboratorium dilakukan di Departemen Agronomi dan Hortikultura Institut Pertanian Bogor, Balai Besar Bioteknologi dan Genetika Bogor, dan Seameo Biotrop Bogor.
Keyword: Citrus grandis (L.) Osbeck, Crop load, Strangulation, Flowering induction, Time of strangulation

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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