Judul: Karakterisasi lima genotipe pepaya hibrida di kebun percobaan IPB Tajur
Abstrak: Penelitian ini bertujuan untuk mempelajari karakter morfologi dan kualitas buah dari lima genotipe pepaya hibrida yang diuji. Penelitian dilaksanakan di Kebun Percobaan IPB Tajur pada bulan Oktober 2009 sampai dengan Februari 2010. Rancangan percobaan yang digunakan adalah Rancangan Kelompok Lengkap Teracak (RKLT) dengan lima genotipe pepaya hibrida sebagai perlakuan. Ulangan dilakukan sebanyak tiga kali pada masing-masing perlakuan, sehingga terdapat 15 satuan percobaan. Setiap satuan percobaan diambil tiga tanaman yang representatif dan sepuluh buah pepaya untuk sampel. Hasil penelitian menunjukkan bahwa hampir semua karakter memiliki perbedaan yang nyata antar genotipe yang diuji kecuali pada karakter diameter batang, tinggi tanaman saat berumur 23 BST, diameter petiol, panjang daun, lebar daun, jumlah buah saat umur 23 BST, jumlah buah panen, bobot buah panen, produktivitas tanaman, diameter ujung buah, kekerasan pangkal dan tengah kulit buah, kekerasan pangkal daging buah, jumlah biji, padatan total terlarut, asam total terlarut dan kandungan vitamin C. Genotipe IPB H59 merupakan genotipe yang memiliki perbedaan karakter paling besar baik secara kuantitatif maupun kualitatif. Berdasarkan hasil analisis cluster, diperoleh dua kelompok besar genotipe. Genotipe IPB H14 dan IPB H59 merupakan pasangan genotipe yang memiliki persentase tingkat kemiripan paling besar. Hasil uji organoleptik menunjukkan bahwa genotipe IPB H14 memiliki rasa, aroma, dan warna daging buah yang disukai oleh responden. Genotipe IPB H59 memiliki bentuk dan kekerasan buah yang disukai oleh responden.
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Judul: Pendugaan Parameter Genetik dan Kualitas Buah Pepaya Hibrida
Abstrak: This study aims to obtain a hybrid papaya varieties that have a high heterosis value to be released into new varieties. The research was conducted in May 2011 to May 2012 at Research Station PKHT IPB Tajur (250 m asl) and at post-harvest laboratory PKHT Baranang Siang, Bogor, West Java. This study used six genotypes consist of 3 hybrid genotypes IPB H93, IPB H91, IPB H39 and parent genotypes IPB 9, IPB 3 and IPB 1. Quantitative parameters were observed that plant height; first fruit position; amount of fruit, flower and leaves per plant; stem diameter; fruit diameter, fruit length and circumference of fruit; whole fruit weight, edible portion, 100 seed weight, and the whole seed weight; the skin and flesh firmness; flesh thickness; total soluble solid (obrix); juice pH; total tritated acid; vitamin C. Qualitative parameters were observed that fruit skin color, flesh color of ripe fruit, fruit shape, and the dominant central cavity. The result showed that hybrid genotype IPB H91 had a lot of character superior to the other between hybrids genotypes and had the better character than the parents.
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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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