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 Character Study of Tanduk Banana (Musa paradisiaca, Group AAB) for Optimization of Heat Unit as a Measurable Harvest Criterion
Abstrak: Pisang, selain menjadi bahan pangan, memiliki arti yang penting bagi Indonesia karena memiliki nilai budaya dan sosio-ekonomi. Pisang memiliki keunggulan sebagai komoditas yang relatif mudah dan murah untuk dibudidayakan. Buah pisang mudah diolah dan dikonsumsi oleh rumah tangga. Penelitian ini dilaksanakan untuk menilai ketepatan umur panen berdasarkan hari setelah antesis (HSA) yang dikonversi ke satuan panas sebagai kriteria panen terukur untuk pisang Tanduk. Percobaan dilaksanakan di Kebun Percobaan Sukamantri, Bogor, Jawa Barat pada ketinggian 550 meter di atas permukaan laut sejak bulan Januari 2020 hingga Mei 2020. Pengujian kualitas pascapanen pisang Tanduk dilaksanakan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor hingga bulan Agustus 2020. Penelitian ini dilakukan dengan rancangan acak lengkap dengan 5 ulangan untuk menguji 5 umur panen: 50, 55, 60, 65, dan 70 HSA. Umur panen tersebut setara dengan akumulasi satuan panas: 965, 1067, 1134, 1201, dan 1297 ˚C hari. Hasil percobaan menunjukkan bahwa perbedaan umur panen tidak mempengaruhi umur peram, kualitas fisik, dan kualitas kimia buah pisang Tanduk, kecuali susut bobot buah., Banana, aside from being a food ingredient, is important to Indonesia because it has cultural and socio-economic value. Banana has the advantage of being a commodity that is relatively easy and inexpensive to be cultivated. The fruit is not difficult to be processed and consumed by the household. This research is done to evaluate the accuracy of harvest using days after anthesis (DAA) converted into heat unit as the measurable harvest criteria for Horn banana. The experiment was carried out in Sukamantri Experimental Plantation, Bogor, West Java at an altitude of 550 m above sea level from January 2020 to May 2020. Postharvest quality testing of Horn bananas was carried out in Postharvest Laboratory, Department of Agronomy and Horticulture, Agricultural Faculty, IPB University until August 2020. This research was conducted in a completely randomized design with 5 replications to test 5 harvest ages: 50, 55, 60, 65, and 70 DAA. Those harvest ages are equivalent to the accumulated heat unit of: 965, 1067, 1134, 1201, and 1297 ˚C day. Experimental results show that difference in harvest age did not affect storage life, physical qualities, and chemical qualities, except for fruit weight loss.
Keyword: antesis, hari setelah antesis, pascapanen, susut bobot, umur peram, anthesis, days after anthesis, post-harvest, storage life, weight loss

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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