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: Optimization of Heat Unit as the Measurable Harvest Criteria of Tanduk Banana (Musa eumusa AAB)
Abstrak: Konsumen dalam membeli pisang mempertimbangkan kualitas fisik dan kualitas kimia. Umur panen yang tepat perlu diperhatikan untuk menghasilkan buah yang berkualitas. Penelitian ini dilaksanakan untuk mengkaji akumulasi satuan panas yang tepat sebagai kriteria panen terukur pisang Tanduk serta pengaruhnya terhadap mutu fisik dan kimia pada tingkat kematangan pascapanen yang sama. Percobaan dilaksanakan di Kebun Percobaan Sukamantri, Bogor, Jawa Barat dan Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Institut Pertanian Bogor sejak bulan Desember 2021 sampai April 2022. Penelitian ini dilakukan menggunakan rancangan acak lengkap dengan 3 ulangan untuk menguji 7 umur panen: 70, 75, 80, 85, 90, 95, 100 hari setelah antesis (HSA). Hasil percobaan menunjukkan pisang Tanduk yang dipanen pada umur panen 70-100 HSA di Kebun Percobaan Sukamantri dengan satuan panas 1035-1444 ˚C hari tidak mempengaruhi komponen produksi, komponen fisik, laju repirasi, dan kualitas kimia pada tingkat kematangan pascapanen yang sama kecuali PTT dan rasio PTT/ATT., Consumers in buying bananas consider the physical quality and chemical quality. Proper harvest age needs to be considered to produce quality fruit. Proper harvest age needs to be considered to produce quality fruit. This research was conducted to examine the accumulation of appropriate heat units as a measurable harvest criterion of Tanduk banana and its effect on physical and chemical quality at the same postharvest maturity. The experiment was carried out at the Sukamantri Experimental Garden, Bogor, West Java and the Postharvest Laboratory, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University from December 2021 to April 2022. This experiment was conducted using a completely randomized design with 3 replications to test 7 harvest ages: 70, 75, 80, 85, 90, 95, 100 days after anthesis (DAA). The experimental results showed that the Tanduk banana harvested at 70-100 DAA at the Sukamantri Experimental Garden with a unit heat of 1035-1444 ˚C day did not affect the production components, physical components, respiration rate, and chemical quality at the same postharvest maturity. except PTT and PTT/ATT ratio.
Keyword: Anthesis, Heat unit, Postharvest, Respiration rate, Storage life

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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