Judul: Pengaruh posisi biji dalam buah terhadap persentase pohon hermaprodit dan keseragaman buah pepaya(Carica papaya L.) kultivar redking
Abstrak: The objective of the study was to find out the effect of seed position in fruit cavity to the number of hermaphrodite tree, tree performance, some of fruit quality properties, and its uniformity. The experiment was carried out on PKBT collection ground at Pasir Kuda, Ciomas, Bogor from April 2003 to November 2003. Observation was conducted on Redking trees population that was 12 month old in the field to determine the number of hermaphrodite trees. The popülation was divided in three rows of trees. Each rows of trees derived from the Seed of fruit-base, middle, or tip. Sample trees were selected with random sampling method for each sub-population trees planted from seed of fruit-base, midale, and tip respectively 10, 10, and 5 trees. To conclude tree and fruit uniformity, observation was conducted only on sample trees and fruits. The result shows that subpopulatin from the middle seed of fruit cavity produce largest number of hermaphrodit tree. The best tree performance was shown by subpopulation from the base seed of fruit cavity. Seed position fruit cavity affect on fruit quality properties, such as fruit diameter and peel weight. The largest fruit diameter produced by subpopulation from the seed from fruit base and the smallest peel weight percentage produce by subpopulation from the seed of fruit tip. Fruit from the whole population have differences on seed weight percentage. The best fruit quality uniformity shown by fruit from trees derived from the tip of fruit cavity seed subpopulation. Further research should be done using better experimental design so can obtain better conclusion.
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Judul: Pengaruh Letak Benih Dalam Buah dan Ukuran Benih Terhadap Penampakan Seks Tanaman dan Vigor Bibit Pepaya (Carica Papaya)
Abstrak: Tujuan penelitian ini adalah untuk mengetahui pengaruh letak benih dalam buah dan ukuran benih terhadap penampakan seks bunga dan vigor bibit pada tiga varietas pepaya. Tujuan yang lain adalah untuk mempelajari sifat vegetatif bibit untuk pendugaan seks tanaman pepaya. Penelitian ini dilaksanakan di kebun percobaan Leuwikopo, Dramaga, Bogor, sejak bulan Agustus 1985 sampai bulan Februari 1986. Rancangan yang digunakan adalah Rancangan Faktorial Kelompok dengan tiga ulangan. Faktor pertama ter diri atas tiga varietas pepaya, yaitu Cibinong, Dampit, dan Jingga. Faktor kedua terdiri atas tiga bagian buah, yaitu bagian pangkal, bagian tengah, dan bagian ujung. Faktor ketiga terdiri atas dua macam ukuran benih, yaitu benih berukuran besar (> 7 mm) dan benih berukuran kecil (< 4 mm). Benih berasal dari buah hermaprodit elongata yang didapat dari hasil persilangan hermaprodit dengan hermaprodit. Luas lahan yang digunakan 1000 m², dan tanaman pepaya yang diamati sebanyak 432. Membeda-bedakan benih berdasarkan letaknya di dalam buah tidak menguntungkan untuk mendapatkan tanaman hermaprodit, tetapi berguna untuk mendapatkan bibit yang vigor pada varietas tertentu, dalam hal ini pada pepaya varietas Cibinong. Benih berukuran kecil yang berasal dari tanaman hermaprodit (yang kedua tetuanya juga hermaprodit), meng- hasilkan tanaman hermaprodit yang lebih banyak dibanding- kan dengan benih berukuran besar. Sifat vegetatif bibit, yaitu tinggi bibit umur satu bulan dan dua bulan, jumlah daun bibit umur satu bulan dan dua bulan, serta lingkar batang bibit umur dua bulan tidak dapat digunakan untuk membedakan tanaman hermaprodit dan tanaman betina.
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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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