Judul: Vigor daya simpan dan vigor kekuatan tumbuh benih pada beberapa genotipe cabai (Capsicum annuum L.)
Abstrak: Chili peppers (Capsicum annuum L.) is one of commercial vegetables which has high economic value in Indonesia. The research was aimed to study the storability period and vigor of nine genotypes of chili pepper seeds through salinity stress and drought stress. The experiment of accelarated aging was using chemical method through methanol (20%) soak period i.e 1, 2 and 3 hour. The genotype number 307 (Bhaskara F1) has highest storability (VDS) based on dry weight of normal seedlings (BKKN) 3.99 mg, 2.77 mg and 1.29 mg, germination percentage (DB) 7.45%, 4.67% and 2.08%, speed of germination (KCT) 3.17% etmal-1, 1.93% etmal-1 and 1.14% etmal-1, and seedling growth rate (LPK) 1.32 mg, 1.54 mg and 1.20 mg. The experiment of sub optimum condition through salinity stress was using NaCl concentration treatment that is 2500, 3750 and 5000 ppm. The genotype number 293 (SKB 27) was elucidated as the most tolerant genotypes to salinity stress through dry weight of normal seedlings 5.15 mg, 5.06 mg and 4.67 mg, germination percentage 68.52%, 57.58% and 53.94%, speed of germination 16.60% etmal-1, 14.30% etmal-1 and 14.00% etmal-1, and seedling growth rate 1.48 mg, 1.54 mg and 1.47 mg. Experiments vigor chilli pepper seeds to drought stress was using PEG 6000 at -1.0, -1.5 and -2.0 bar. The genotype number 307 (Bhaskara F1) was elucidated as the most resistance genotypes to drought stress through dry weight of normal seedlings 5.07 mg, 5.02 mg and 4.69 mg, germination percentage 60.84%, 60.81% and 56.59%, speed of germination 16.04% etmal-1, 15.13% etmal-1 and 13.88% etmal-1, seedling growth rate 1.52 mg, 1.51 mg and 1.49 mg and the length of radicle (PR) 2.20 cm, 1.46 cm and 1.81 cm.
Keyword: vigor, salinity, rapid, drought, chili, Bogor Agricultural University (IPB)

Judul: Analysis of seed vigor in relation to storability of pepper (Capsicum annuum L.) Seedand its genetic parameter estimation
Abstrak: Kemampuan benih cabai dalam mempertahankan mutu benihnya di penyimpanan atau daya simpan benih cabai merupakan kendala vigor benih di pemasaran.Daya simpan benih cabai ditentukan oleh vigor benih. Metode pengujian vigor benih cabai yang mudah, cepat, efisien dan bjektif belum banyak diteliti. Vigor benih cabai dikendalikan oleh faktor genetik, dan vigor adalah sifat kuantitatif yang dipengaruhi oleh lingkungan selama pembentukan benih, panen dan penyimpanan. Penelitian ini mencakup tiga percobaan yaitu (1) Metode pengusangan cepat untuk pengujian vigor daya simpan benih cabai ((Capsicum annuun L.), (2) Konsistensi metode pengujian vigor daya simpan benih cabaidan (3) Pendugaan parameter genetik vigor daya simpan benih cabai menggunakan analisis silang halfdialel. Percobaan pertama bertujuan mendapatkan metode pengujian vigor benih cabai yang mudah, cepat, tepat dan objektif khususnya vigor daya simpan. Benih tanamanyang digunakan adalah benih cabai (Capsicum annuum L) koleksi Bagian Genetika dan Pemuliaan Tanaman Institut Pertanian Bogor (IPB) yang baru dipanen. Metode percobaan menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) dengan satu faktor. Faktornya adalah metode pengujian vigor daya simpan benih cabai. Metode perconaannya terdiri dari 5 metode yaitu 1 metode deteriorasi alami (natural deterioration pada suhu kamar dan RH terkontrol(metode pembanding), dengan periode 0, 3, 6, 9 dan 12 bulan dengan 4 metode pengusangan cepat yang akan dibandingkanya itu (1) metode pengusangan cepat dengan air panas 60ºC dengan periode 0, 60. 120, 180 dan 240 menit,(2) metode pengusangan cepat dengan larutan metanol 20% dengan periode 0, 2, 4, 6 dan 8 jam, (3) metode pengusangan dengan larutan etanol 20% dengan periode 0, 2, 4, 6 dan 8 jam, dan (4) metode deteriorasi terkontrol pada suhu tinggi 40°C, dengan periode 0,24,48,72 dan 96 jam.
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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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