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: Karakterisasi sifat-sifat morfologi dan kimiawi pada dua genotipa tanaman pepaya ( Carica papaya L. ) dengan perbedaan sumber sumber benih dalam buah
Abstrak: Penelitian ini dilakukan untuk mengevaluasi sifat-sifat morfologi dan kimiawi pada dua genotipa tanaman pepaya dengan perbedaan sumber benih dalam buah. Penelitian dilaksanakan di kebun percobaan IPB Pasir Kuda, Cio.nas dan di Laboratorium Pusat Kajian Buah-buahan Tropis (PKBT) Baranangsiang, Bogor pada bulan Februari 2003 hingga bulan September 2003. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL) dua faktor. Faktor pertama adalah genotipa pepaya, yaitu: Eksotika dan Red King dan faktor kedua adalah perbedaan sumber henih dalam buah, yaitu: bagian pangkal, tengah, dan ujung. Hasil penelitian menunjukkan bahwa terdapat keragaman morfologi dan kimiawi pada dua genotipa tanaman pepaya Eksotika dan Red King, di mana Eksotika tanamannya lebih tinggi, lingkar batangnya lebih besar, dan lebar kanopinya lebih lebar dibanding dengan Red King. Jumlah daun dan buah Eksotika lebih banyak daripada Red King. Warna batang Eksotika ungu, sedangkan Red King hijau. Warna kulit buah Eksotika kuning, sedangkan Red King merah. Bobot buah, panjang buah, tebal daging buah, dan diameter buah Red King lebih besar daripada Eksotika. Persentase Brix dan pH Eksotika lebih tinggi daripada Red King. Tanaman hermaprodit banyak dihasilkan dari sumber benih bagian tengah dan ujung, sehingga sumber benih bagian tengah dan ujung baik untuk dijadikan sebagai benih perbanyakan. Hasil uji korelasi memperlihatkan bahwa karakter tinggi tanaman berkorelasi positif sangat nyata dengan jumlah daun dan jumlah buah. Hal ini menunjukkan bahwa pertambahan tinggi tanaman akan meningkatkan jumlah daun dan jumlah buah. Hal ini diduga karena dengan bertambahnya tinggi ..dst
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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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