Judul: Kriteria Kematangan Pascapanen Pisang Raja Bulu dan Pisang Kepok
Abstrak: Bananas are one of the leading fruit nation wide. Bananas are divided into 2 types based on the consumption. First, type the consumption of fresh bananas with banana varieties Raja Bulu samples and second type of processed plantain bananas with banana varieties Kepok samples. The purpose of this research is to study maturity indices studied post-harvest Raja Bulu banana and Kepok banana of some age picking fruit and determining the best harvesting time for postharvest handling. Observations that have been made show that the greater the picking age negatively correlated with the length of shelf life. At maturity level 5 color scale, picking bananas indicates different maturation process. At Raja Bulu Banana and Kepok Banana, apparent influence of shelf life observations, the percentage weight loss, percentage of edible parts, content of total tertitration acid, and content of vitamin C. Based on the results of the statistical analysis, the best harvest for post harvest handling in order to extend the shelf life on Raja Bulu Banana is 95 days, while for Kepok Banana is 110 days.
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Judul: . Kriteria Kematangan Pascapanen Pisang Raja Bulu Pada Beberapa Umur Petik
Abstrak: Pisang lebih disukai oleh masyarakat karena harganya yang terjangkau dan banyak mengandung vitamin dan mineral, disamping itu buah pisang memiliki permasalahan pascapanen buah yang cepat matang. Tujuan penelitian ini adalah mempelajari kriteria kematangan pascapanen buah pisang Raja Bulu dari beberapa umur petik dan menentukan saat panen terbaik untuk penanganan pascapanen. Percobaan dilaksanakan pada bulan Januari sampai Juni 2014. Penandaan bunga pisang dilaksanakan pada bulan Januari di kebun pisang milik warga di Sumedang Jawa Barat pada ketinggian 900 mdpl dan pengujian pascapanen dilaksanakan pada bulan Mei hingga Juni di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Percobaan dilaksanakan dengan rancangan kelompok lengkap teracak (RKLT) faktor tunggal dengan 6 umur petik sebagai perlakuan, yaitu 85, 90, 95, 100, dan 105 hari setelah antesis (HSA) masing-masing dengan 5 ulangan dan 3 ulangan untuk 110 (HSA) sehingga terdapat 28 satuan percobaan. Hasil percobaan menunjukkan bahwa umur petik terbaik pisang Raja Bulu dicapai pada 85 HSA dengan umur simpan terlama (11 hari) serta satuan panas sebesar 1305.5 °C hari. Buah pisang yang dipetik tua lebih cepat mencapai kematangan pascapanen dibandingkan dengan buah pisang yang dipetik muda. Pisang yang dipetik muda memiliki laju respirasi yang rendah dibandingkan dengan buah pisang yang dipetik tua. Umur petik tidak mempengaruhi mutu fisik dan kimia buah pisang pada tingkat kematangan pascapanen yang sama.
Keyword: laju respirasi, skala warna, umur simpan

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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