Judul: Study on flower morphology, pollination and fruit development of IPB’s papaya for fruit quality control
Abstrak: Tujuan dari studi ini ialah: untuk mengetahui keragaan morfologi bunga pepaya IPB; mengetahui fisiologi pembuahan melalui viabilitas dan pertumbuhan tabung sari pepaya; mengetahui pengaruh penyerbukan terhadap mutu buah pepaya IPB 3 dan IPB 2, dan karakter mutu buah yang dapat dijadikan dasar pengendalian mutu buah pepaya. Penelitian dilakukan dengan percobaanpercobaan yang terdiri dari studi: morfologi bunga, viabilitas dan pertumbuhan tabung sari, penyerbukan bunga dan mutu buah pepaya. Kesimpulan umum dari penelitian ini ialah informasi tentang penyerbukan dan morfologi bunga terkait dengan ekspresi seks tanaman dapat digunakan untuk mengatur bentuk, ukuran dan mutu buah pepaya. Tanaman betina menghasilkan bunga betina dan tanaman hermafrodit menghasilkan bunga hermafrodit serta ekspresi seks bunga tanaman pepaya baru diketahui setelah tanaman berbunga. Letak benang sari yang berdekatan dan di atas stigma bunga terdapat pada bunga pepaya kategori buah kecil, sedangkan letak benang sari lebih jauh dan di bawah stigma bunga terdapat pada kategori buah sedang dan buah besar. Bunga hermafrodit genotipe IPB 1 menunjukkan ketidak teraturan jumlah lekukan pada tangkai kepala putik, berbeda dengan lekukan pada tangkai kepala putik bunga betina IPB 1 yang konsisten berjumlah lima lekukan. Perkembangan bunga betina genotipe IPB 1 sampai terbentuk bakal buah berlangsung selama 4-5 hari, sedangkan pada hermafrodit lebih lama yaitu sekitar 5-7 hari.
Keyword: Carica papaya L.

Judul: Karakterisasi Morfologi Bunga, Buah dan Kualitas Buah Tiga Genotipe Pepaya Hibrida
Abstrak: This research was conducted from January-June 2012 at Teaching Farm Tajur and Postharvest Laboratory Baranang Siang, PKHT-IPB-Bogor. The objective of this research was to study the morphological characters of flowers, fruit, and fruit quality of three genotypes of hybrid papaya IPB H91, IPB H93, and IPB H39. The parameters were the qualitative and quantitative character of flowers and fruit, physical and chemical quality of fruit and organoleptic test. The result of the research showed that three genotypes of hybrid papaya had different superior characters. IPB H91 had long flower stalks, a high flower number per stem and fruits, high fruit flesh weight, edible portion, and flesh thickness, hard flesh firmness, and low total titrated acid. IPB H93 had many high flower number, low seed number per fruits and high total soluble solid. IPB H39 had short distance between the segment, hard fruit peel firmness and high vitamin C content. Organoleptic test showed that IPB H39 had shape and taste more preferred by panelist. IPB H91 can be alternative to get hybrid papaya because had more superior characters at generative phase than other genotype
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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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