Judul: Post-harvest Maturity Indices of Ambon Banana (Musa eumusa AAA Group) at Different Harvesting Ages
Abstrak: Buah merupakan salah satu sumber makanan yang kaya akan gizi dan vitamin serta yang sering dikonsumsi oleh kalangan masyarakat Indonesia salah satunya ialah buah pisang. Tujuan penelitian ini adalah mempelajari kriteria dan proses kematangan pascapanen pisang Ambon dari beberapa umur panen dan menentukan saat panen terbaik untuk penanganan pascapanen. Percobaan dilaksanakan di Kebun Percobaan Sukamantri dengan rancangan kelompok lengkap teracak faktor tunggal dengan 5 umur panen pisang. Pengambilan data pengamatan dilaksanakan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Hasil percobaan menunjukkan pisang Ambon dapat dipanen pada umur panen 90–95 hari setelah antesis (HSA) dengan umur simpan 14–15 hari serta satuan panas mencapai 1265–1330 oC hari. Buah pisang Ambon yang dipanen dengan umur yang tua lebih cepat mencapai kematangan pascapanen dibandingkan buah pisang Ambon yang dipanen dengan umur yang lebih muda. Faktor umur panen tidak mempengaruhi secara signifikan sifat-sifat fisik dan kimia buah pada tingkat kematangan pascapanen yang sama., Fruit is one of the rich sources of nutrition and vitamins and is commonly consumed by the Indonesian population, one of which is the banana. The aim of this research is to study the criteria and post-harvest ripening process of Ambon bananas at different harvesting ages and determine the best harvesting time for post-harvest handling. The experiment was conducted at the Sukamantri Experimental Garden using a completely randomized design with a single-factor treatment, which involved 5 different harvesting ages of bananas. Data collection and observations were carried out at the Post-Harvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University. The results of the experiment indicate that Ambon bananas can be harvested at the harvest age of 90–95 days after anthesis (DAA), with a storage age of 14–15 days, and they require a cumulative heat unit of 1265–1330 oC day. Ripe Ambon bananas harvested at an older age reach post-harvest ripeness faster compared to Ambon bananas harvested at a younger age. The harvesting age factor does not significantly affect the physical and chemical characteristics of the fruit at the same level of post-harvest ripeness.
Keyword: laju respirasi, skala warna, umur simpan

Judul: Postharvest Maturity Criteria of Uli Banana (Musa  sp. AA Group) at Several Harvesting Ages
Abstrak: Buah pisang merupakan buah yang dapat dipanen sepanjang tahun tanpa dipengaruhi oleh musim, jenis tanaman pisang sangat beragam dan beberapa diantaranya tumbuh dan dibudidayakan di kebun atau di pekarangan rumah, salah satunya adalah pisang Uli. Penelitian ini bertujuan mempelajari kriteria kematangan pascapanen pisang Uli dari beberapa umur panen dan menentukan waktu panen terbaik berdasarkan satuan panas yang diperoleh. Percobaan dilaksanakan di Kebun Percobaan Sukamantri dengan rancangan kelompok lengkap teracak faktor tunggal dengan 5 umur panen pisang. Pengamatan dilaksanakan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor. Buah pisang Uli dapat dipanen pada 90 hari setelah antesis (HSA) pada akumulasi satuan panas 1179 °C hari dengan umur simpan mencapai 13 hari setelah panen (HSP). Buah dengan umur panen lebih muda menghasilkan tingkat kematangan lebih lama dibandingkan buah yang dipanen lebih tua. Umur panen tidak memberikan pengaruh terhadap sifat fisik dan sifat kimia buah pada kematangan yang sama., Banana is a fruit that can be harvested throughout the year without being influenced by the season, the types of banana plants are very diverse and some of them grow and are cultivated in gardens or in the yards, one of which is Uli banana. This research aims to study the post harvest maturity criteria for Uli bananas from several harvest ages and determine the best harvest time based on the heat units obtained. The experiment was carried out at the Sukamantri Experimental Station with a single factor randomized complete group design with 5 banana harvest ages. Observations were carried out at the Postharvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural Institute. Uli banana fruit can be harvested at 90 days after anthesis (DAA) at an accumulated heat unit of 1179 °C days with a shelf life of up to 13 days after harvest (DAH). Fruit with a younger harvest yields a longer maturity than fruit harvested at an older age. Harvest age has no influence on the physical and chemical properties of fruit at the same maturity.
Keyword: laju respirasi, umur simpan, skala warna

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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