Judul: Evaluasi Kematangan Pascapanen Buah Pisang Mas Kirana (Musa acuminata, AA Group Banana) Menggunakan Kajian Satuan Panas di Sukamantri, Bogor, Jawa Barat.
Abstrak: Pisang merupakan salah satu jenis buah yang digemari oleh masyarakat luas terutama pada negara maju serta banyak dibudidayakan di negara tropis dan subtropis hangat. Penelitian ini bertujuan untuk memantapkan kualitas panen buah pisang Mas Kirana menggunakan metode akumulasi satuan panas ±650 °C hari setelah antesis sebagai kriteria panen terukur pisang Mas Kirana di Sukamantri, Jawa Barat. Percobaan dilakukan di kebun percobaan Sukamantri, Bogor, Jawa Barat pada ketinggian 550 meter diatas permukaan laut pada bulan Maret 2020 hingga Juni 2020. Sisir ke-3 buah pisang Mas Kirana dipisahkan dari tandan buah pisang yang telah dipanen lalu dibawa dan diuji mutu fisik dan kimia di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura, Fakultas Pertanian, Intstitut Pertanian Bogor pada bulan April 2020 hingga Juni 2020. Percobaan dilakukan dengan menggunakan rancangan acak lengkap (RAL) sebanyak 4 waktu antesis yang berbeda. Selang waktu antar perlakuan paling lama 3 hari dari tanaman pertama antesis dan setiap perlakuan terdiri atas 3-5 pohon pisang sebagai ulangan. Buah pisang Mas Kirana dapat dipanen pada antesis 662 °C hari atau 35 hari setelah antesis dengan waktu peram selama 12-14 hari. Waktu antesis bunga pisang tidak mempengaruhi mutu buah pisang Mas Kirana yang telah matang peram baik mutu fisik maupun mutu kimia., Banana is one of the most favorable fruits worldwide especially in developed countries and have been widely cultivated in tropical and warm subtropical countries. one of them is Indonesia. The purpose of this experiment is to evaluate and ensure the harvest quality of Mas Kirana banana fruit using heat unit accumulation of ±650 ºC after anthesis as a measured method of harvest in Sukamantri, West Java. This experiment was carried out in Sukamantri Experimental Plantation, Bogor, West Java the altitude of 550 meter above sea level from March 2020 to June 2020. The third hand is separated from the harvested banana bunch then brought and examined by their physical and chemical qualities in Post-harvest Laboratory, Department of Agronomy and Horticulture, IPB University in April 2020 to June 2020. This research conducted in a completely randomized design consist of 4 different tagging period, each period is separated by 3 days after the first plant start anthesis and period consist of 3-5 banana trees as repetition. Mas Kirana banana can be harvested for 662 °C or 35 days after anthesis which have green-life for 12- 14 days. Difference of anthesis time of banana flower doesn’t have a significant effect on physical quality nor chemical quality in ripened Mas Kirana banana.
Keyword: antesis, pascapanen, susut bobot, umur peram

Judul: Heat Unit Optimization as Measured Harvest Criteria of Mas Kirana Banana (Musa acuminata AA Group)
Abstrak: Produksi pisang di Indonesia terus meningkat setiap tahun. Buah pisang merupakan buah klimakterik yang memiliki karakteristik mudah rusak sehingga dibutuhkan penanganan panen yang tepat. Penentuan waktu panen merupakan fase yang penting untuk dapat menghasilkan pisang dengan kualitas baik dan umur simpan yang panjang. Salah satu metode penentuan waktu panen yang terukur adalah dengan menggunakan akumulasi satuan panas. Percobaan ini bertujuan mengevaluasi satuan panas 650 °C hari setelah antesis sebagai kriteria panen terukur pisang Mas Kirana. Percobaan dilaksanakan di Kebun Percobaan Sukamantri IPB, Bogor, Jawa Barat, pada bulan Desember 2021 hingga Februari 2022. Analisis laboratorium dilakukan di Laboratorium Pascapanen, Departemen Agronomi dan Hortikultura IPB pada bulan Januari hingga Maret 2022. Rancangan percobaan yang dilakukan adalah Rancangan Acak Lengkap (RAL) dengan faktor tunggal, yaitu waktu antesis, yang terdiri dari lima perlakuan. Hasil percobaan menunjukkan bahwa perbedaan waktu antesis pada pisang Mas Kirana yang dipanen dengan akumulasi satuan panas 650 oC hari setelah antesis secara umum tidak mempengaruhi kriteria panen, laju respirasi, kualitas fisik buah, dan kualitas kimia buah pada tingkat kematangan pascapanen yang sama, Banana production in Indonesia is increasing every year. Banana is a climacteric fruit that has perishable characteristics so that need to get the proper harvest handling. Determination of harvest time is an important phase to be able to produce bananas with good quality and long shelf life. One method of determining the measured harvest time is to use heat units. The objectives of this study were to evaluated the heat unit accumulation of 650 °C day after anthesis as a criterion for measurable harvest of “Mas Kirana” banana. The research was conducted at Sukamantri IPB Experimental Station, Bogor, in December 2021 to February 2022. Laboratory analysis was conducted in Postharvest Laboratory IPB in January to March 2022. The experimental design used was a Completely Randomized Design with a single factor, time of anthesis, which consisted of five treatments. The experimental results showed that the difference in the time of anthesis on Mas Kirana bananas harvested with the accumulation of heat units at 650 oC days after anthesis generally did not affect the harvest criteria, respiration rate, physical quality of the fruit, and chemical quality of the fruit at the same postharvest maturity level.
Keyword: anthesis, degree day, postharvest, shelf 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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