Judul: Pemantapan Satuan Panas sebagai Kriteria Panen Terukur Pisang Tanduk (Musa paradisiaca, AAB Group)
Abstrak: Pisang merupakan buah yang paling banyak diproduksi di Indonesia. Buah pisang termasuk buah klimakterik yang terus mengalami proses pematangan setelah dipanen. Kemampuan mengidentifikasi kematangan buah yang tepat diperlukan untuk mendapatkan hasil panen lebih optimal. Metode terukur untuk menentukan kriteria kematangan pisang adalah menggunakan akumulasi satuan panas. Penelitian ini bertujuan memantapkan akumulasi satuan panas 1260 oC hari setelah antesis sebagai kriteria panen terukur pisang Tanduk serta melihat pengaruhnya terhadap kualitas fisik dan kimia buah. Penelitian dilaksanakan di Kebun Percobaan Sukamantri IPB, Bogor, Jawa Barat pada bulan Januari hingga Mei 2023 dan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura pada bulan April hingga Mei 2023. Rancangan percobaan menggunakan Rancangan Acak Lengkap dengan faktor tunggal, yaitu waktu antesis yang terdiri atas lima perlakuan. Hasil penelitian menunjukkan bahwa beda waktu antesis pisang Tanduk namun dipanen pada akumulasi satuan panas yang sama 1260 oC hari setelah antesis mampu menghasilkan kualitas buah yang seragam., Bananas are the most produced fruit in Indonesia. Bananas are a climacteric fruit that continues to undergo a ripening process after being harvested. The ability to identify the right fruit ripeness is needed to get more optimal yields. The measurable method for determining banana ripeness criteria is to use accumulated heat units. This study aims to establish the accumulation of heat units at 1260 oC days after anthesis as a measurable harvest criterion for Tanduk bananas and its effect on the physical and chemical qualities of the fruit. The research was conducted at the Sukamantri Experimental Garden of IPB, Bogor, West Java from January to May 2023 and at the Postharvest Laboratory, Department of Agronomy and Horticulture from April to May 2023. The experimental design used was a Completely Randomized Design with a single factor, namely anthesis time which consisted of five treatments. The results showed that different times of anthesis on Tanduk banana but harvested at the same heat unit accumulation of 1260 oC days after anthesis was able to produce uniform fruit quality.
Keyword: anthesis, chemical quality, heat unit, physical quality, postharvest

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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