Judul: Pengaruh penyadapan dan posisi tandan terhadap mutu benih serta teknik konservasi kecambah terhadap pertumbuhan bibit aren (Arenga pinnata (Wurmb) Merr).
Abstrak: The experiment was conducted at Seed Science and Techology Laboratory of IPB, from January to October 2012. The aim of this research was to investigate if tapping of male inflorescence and position of female inflorescence affect seed quality (experiment 1) and conservation technique and period at seedling stage affect subsequent growth of sugar palm seedling (experiment 2). A completely Randomized Design with two factors was used in experiment 1. The first factor was tapping i.e untapped and tapped. The second factor was position of female inflorescence i.e first, third and fifth. Each experiment was replicated four times. Split plot design with two factors was used in the experiment 2. The main plot was conservation technique i.e. plastic bag, rice husk charcoal with 10%, 20% and 30% moisture content, saw mill husk with 10%, 20% and 30% moisture content.The sub plot was periode of conservation i.e without conservation, one week and two weeks conservation. The result of experiment 1 showed that tapping and position of female inflorescence did not affect seed quality therefore seed can be taken from any trees in all position of female inflorescence. The result of experiment 2 showed that rice husk charcoal with 20% and 30% moisture content was effective for conservation sugar palm seedling up to two weeks.
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Judul: Pengaruh cara ekstraksi benih dan perlakuan pematahan dormansi terhadap viabilitas benih aren, Arenga pinata (Wurmb.) Merr.
Abstrak: Penelitian ini bertujuan untuk mengetahui pengaruh cara ekstraksi benih dan perlakuan pematahan dormansi terhadap viabilitas benih aren (Arenga pinnata (Wurmb.) Merr.). Penelitian dilaksanakan mulai bulan April 2005 sampai dengan Oktober 2005, bertempat di Laboratorium dan Rumah Kasa Ilmu dan Teknologi Benih, Fakultas Pertanian, IPB. Benih aren yang digunakan berasal dari hutan aren di Desa Omu Kecamatan Sigi Biromaru Kabupaten Donggala, Sulawesi Tengah. Rancangan percobaan yang digunakan dalam penelitian ini adalah Rancangan Acak Kelompok (RAK) yang terdiri dari 2 faktor. Faktor pertama adalah Cara Ekstraksi Benih (E) yang terdiri dari 2 taraf yaitu buah direndam dalam air selama 5 hari (E₁) dan buah diperam dalam karung goni lembab selama 10 hari (E2). Faktor kedua adalah Perlakuan Pematahan Dormansi (P) yang terdiri dari 7 taraf yaitu skarifikasi benih dengan menggosok menggunakan kertas amplas (P1), skarifikasi dan direndam dalam KNO3 0,5% selama 36 jam (P2), skarifikasi dan direndam dalam Previcur N 5 ml/1 selama 6 jam (P3), skarifikasi dan dimasukkan dalam inkubator pada suhu 40 °C selama 5 menit (P4), skarifikasi dan dimasukkan dalam inkubator pada suhu 35 °C selama 5 menit (P5), skarifikasi dan direndam dalam KNO3 0,5% selama 36 jam kemudian dimasukkan dalam inkubator pada suhu 40 °C selama 5 menit (P6), skarifikasi dan direndam dalam KNO3 0,5% selama 36 jam kemudian dimasukkan dalam inkubator pada suhu 35 °C selama 5 menit (P7). Terdapat 14 kombinasi perlakuan dan setiap perlakuan diulang sebanyak 3 kali sehingga terdapat 42 satuan percobaan. Parameter yang diamati meliputi Viabilitas Total dengan tolok ukur Potensi Tumbuh Maksimum (%), Viabilitas Potensial dengan tolok ukur Daya Berkecambah (%) dan Viabilitas Dormansi dengan tolok ukur Intensitas Dormansi (%).
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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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