Judul: Kualitas Buah Melon Varietas Cantaloupe (Cucumis melo L. var. cantaloupe) Selama Penyimpanan Berdasarkan Umur Panen
Abstrak: Buah melon cantaloupe memiliki keunggulan berupa warna daging buah yang menarik dan memiliki kandungan vitamin yang lebih baik dibanding buah melon pada umumnya. Melon cantaloupe merupakan jenis melon berjala yang memiliki karakter klimakterik sehingga umur simpannya lebih pendek. Tujuan dari penelitian ini adalah menentukan umur panen buah melon varietas cantaloupe dengan kualitas yang baik dan umur simpan yang optimum. Percobaan dilaksanakan pada bulan Februari sampai Juni 2023 di greenhouse Kebun Percobaan Tajur I Pusat Kajian Hortikultura dan Tropika (PKHT) IPB serta Laboratorium Pascapanen dan Biomassa IPB. Percobaan menggunakan Rancangan Kelompok Lengkap Teracak (RKLT) faktor tunggal yang terdiri dari 3 perlakuan yaitu umur panen pada 80, 85, dan 90 hari setelah tanam (HST). Percobaan terdiri atas 4 ulangan dan setiap satu ulangan terdiri atas 7 buah melon sehingga total terdapat 84 buah. Hasil penelitian menunjukkan buah melon cantaloupe dapat dipanen lebih awal yaitu pada umur 80 HST karena kualitas fisik dan kimianya tidak menunjukkan perbedaan yang nyata dibandingkan dengan buah yang dipanen pada 85 dan 90 HST. Buah yang dipanen pada umur tanaman 80 HST mampu meningkatkan umur simpan lebih panjang dibandingkan dengan buah melon yang dipanen akhir. Kata kunci: buah melon, klimakterik, kualitas, umur panen, Cantaloupe melon has the advantage of having an attractive flesh color and a better vitamin content than melons in general. Cantaloupe melon is a type of melon that has a climacteric character so that its shelf life is shorter. The objective of this experiment was to determine the harvesting time of the cantaloupe melon with a acceptable level of quality and optimum shelf life. The experiment was conducted from February to June 2023 in the greenhouse of Tajur 1, Center for Horticultural and Tropical Studies IPB, and Postharvest and Biomass Laboratory IPB. Experiment was carried out using a single factor Completely Randomized Block Design which consisted of 3 treatments, harvesting time at 80, 85, and 90 days after planting. The experiment consisted of 4 replications and each experimental unit consisted of 7 fruits, so there were a total of 84 fruits. The results revealed that cantaloupe melons could be harvested faster at the age of 80 days after planting since the physical and chemical qualities did not indicate a significant difference compared to the fruits harvested at 85 and 90 days after planting. Fruit harvested at plant age 80 days after planting were also able to preserve a longer shelf life compared to melons harvested at a longer time. Keywords: climacteric, harvest time, melon fruit, quality
Keyword: climacteric, harvest time, melon fruit, quality

Judul: Plant Morphological Characteristics and  Fruit Quality of 26 Genotypes of Melon (Cucumis melo L.)
Abstrak: Melon merupakan salah satu komoditas hortikultura yang memiliki nilai ekonomis dan berpotensi untuk dikembangkan. Pembentukan varietas unggul dalam negeri perlu terus diupayakan melalui program pemuliaan tanaman. Penelitian ini bertujuan mempelajari keragaman karakteristik morfologi tanaman dan kualitas buah pada sejumlah genotipe melon hasil pemuliaan dari Pusat Kajian Hortikultura Tropika IPB, dan mengidentifikasi genotipe melon potensial untuk program pemuliaan tanaman. Penelitian dilakukan di Greenhouse C Kebun PKHT IPB Tajur 1 dan Laboratorium Pasca Panen Departemen Agronomi dan Hortikultura IPB dari bulan Oktober 2022 hingga Januari 2023. Genotipe yang dievaluasi terdiri atas 25 genotipe koleksi PKHT IPB dan satu varietas hibrida komersial sebagai pembanding yaitu Alisha F1. Percobaan menggunakan rancangan kelompok lengkap teracak (RKLT) faktor tunggal (genotipe) dengan tiga ulangan. Hasil penelitian menunjukkan bahwa genotipe berpengaruh nyata terhadap semua karakter kuantitatif yang diamati termasuk karakter kualitas buah (PTT, kekerasan kulit buah, vitamin C, dan TAT). Analisis korelasi menunjukkan bahwa diameter buah berkorelasi positif dengan bobot buah dan berkorelasi negatif dengan TAT. Genotipe G1, G41, HD 1–145, 316, HD 2–111, dan P34 berpotensi dikembangkan lebih lanjut dalam program pemuliaan., Melon is one of the horticultural commodities with significant economic value and potential for development. Breeding improved domestic varieties needs to be continuously pursued through plant breeding programs. This study aimed to elucidate the plant morphological characteristics and fruit quality of several melon genotypes from the Center for Tropical Horticulture Studies IPB and identify potential melon genotypes for plant breeding programs. The research was conducted at Greenhouse C of PKHT IPB Tajur 1 Experimental Station and Post Harvest Laboratory of the Department of Agronomy and Horticulture IPB, from October 2022 to January 2023. Genetic materials evaluated were 25 genotypes from the PKHT IPB collection and one commercial hybrid variety Alisha F1 as a check. This experiment was arranged in a randomized complete block design (RCBD) with a single factor (genotype) and three replications. The results showed that genotypes significantly influenced all quantitative traits observed including fruit quality traits (TSS, fruit skin hardness, vitamin C, and TTA). Correlation analysis among traits indicated that fruit diameter had a positive correlation with fruit weight and a negative correlation with TTA. Genotypes G1, G41, HD 1–145, 316, HD 2–111, and P34 are considered potential for further development in a breeding program.
Keyword: fruit quality, genetic variability, melon breeding, traits

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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