Judul: Phenology of Agronomic Characters of Several  Mung Bean (Vigna radiata L. Wilczek) Lines at Different Harvest Periods
Abstrak: Kacang hijau menjadi salah satu sumber protein yang banyak dikonsumsi oleh masyarakat Indonesia. Panen yang serempak sangat penting dalam budidaya kacang hijau. Penelitian bertujuan memperoleh informasi mengenai fenologi karakter agronomi galur-galur kacang hijau hasil pemuliaan IPB pada periode panen yang berbeda dan memperoleh genotipe hasil tinggi pada panen serempak. Penelitian dilaksanakan pada bulan November 2022 hingga April 2023 di Kebun Percobaan Leuwikopo IPB. Penelitian menggunakan rancangan kelompok lengkap teracak pola tersarang dengan dua faktor, faktor pertama galur kacang hijau dan faktor kedua periode panen. Masing-masing faktor terdiri atas tiga ulangan sehingga terdapat 72 satuan percobaan. Hasil penelitian menunjukkan bahwa perlakuan panen yang berbeda tidak berpengaruh nyata terhadap karakter umur berbunga, umur polong hitam pertama, tinggi tanaman saat berbunga, tinggi tanaman saat panen terakhir, jumlah cabang total, jumlah cabang produktif, dan panjang tandan bunga, namun berpengaruh sangat nyata terhadap karakter jumlah polong per tanaman, bobot polong per tanaman, dan bobot biji per tanaman. Genotipe F7-VR10/V1-29 memiliki umur berbunga, umur polong hitam pertama, umur panen, jumlah cabang produktif, jumlah polong per tanaman, bobot polong per tanaman, dan bobot biji per tanaman yang setara atau lebih baik dari pembanding Vima 1. Genotipe yang memiliki hasil tinggi pada periode panen serempak yaitu F7-VR10/V1-29., Mung bean is a source of protein that is widely consumed by Indonesian. Simultaneous harvest is very important in mung bean production. The aims of the study were to obtain information on the phenology of agronomic characters of IPB mung bean lines at different harvesting periods and to select high-yielding genotypes. The research was carried out from November 2022 to April 2023 at the Leuwikopo Experimental Field, IPB University. The study used a randomized complete block design with nested pattern with two factors. The first factor was the mung bean lines and the second factor was the harvest period. Each factor consisted of three replications so that there were 72 experimental units. The results showed that different harvest treatments had no significant effect on the characters of day to flowering, day to the first black pods, plant height at flowering, plant height at last harvest, total number of branches, number of productive branches, and length of flower bunches, but had a very significant effect on the character of the number of pods per plant, pod weight per plant, and seed weight per plant. Genotype F7-VR10/V1-29 had day to flowering, day to first black pod, day to harvest, number of productive branches, number of pods per plant, pod weight per plant, and seed weight per plant which was equal to or better than Vima 1. The highest yieldiy genotype with simultaneous harvest was F7-VR10/V1-29.
Keyword: genotipe, hasil tinggi, panen serempak, protein, rancangan tersarang

Judul: Yield Test of 22 Mung Bean (Vigna radiata L.) Strains  Results of IPB Breeding
Abstrak: Kacang hijau merupakan tanaman legum yang telah dikenal secara luas di Indonesia karena kandungan proteinnya tinggi dan mudah dicerna, kadar lemaknya yang rendah, serta memiliki berbagai manfaat bagi kehidupan. Penelitian ini bertujuan untuk mendapatkan informasi tentang daya hasil 22 galur kacang hijau IPB. Penelitian ini dilaksanakan pada bulan November 2022 hingga Maret 2023 di Kebun Percobaan Balai Penelitian Bioteknologi dan Sumberdaya Genetik Pertanian, Kota Bogor. Penelitian ini terdiri dari satu faktor yaitu 22 genotipe kacang hijau IPB dan dua varietas pembanding. Rancangan percobaan yang digunakan yaitu rancangan kelompok lengkap teracak dengan 3 ulangan. Hasil penelitian menunjukkan adanya perbedaan yang nyata antara genotipe yang diuji. Genotipe yang memiliki produktivitas yang lebih tinggi dibandingkan dengan genotipe pembanding secara deskriptif diantaranya F7-Lom2/129-2, F7- Lom2/129-28, F7-VR10/V1-6, F7-VR10/V1-10, F7-VR10/V1-29, F6- VR422H/129-1, F5-Lom2/129-125, F6-VR480B-213, dan F6-Lom2/V2-6., Mung bean is a legume crop that is widely known in Indonesia because of its high protein content and ease of digestion, low-fat content, and various benefits for life. This study aims to obtain information about the yield of 22 IPB mung bean lines. This research was conducted from November 2022 to March 2023 at the Experimental Garden of the Agricultural Genetic Resources and Biotechnology Research Institute, Bogor City. This study consisted of one factor, namely 22 IPB mung bean genotypes, and two control varieties. The experimental design used was a randomized complete block design with 3 replications. The results showed that there were significant differences between the genotypes tested. The genotypes that had higher productivity compared to the comparative varieties descriptively included F7-Lom2/129-2, F7-Lom2/129-28, F7-VR10/V1-6, F7-VR10/ V1-10, F7-VR10/V1-29, F6-VR422H/129-1, F5-Lom2/129-125, F6- VR480B-213, and F6-Lom2/V2-6.
Keyword: genetic, high-yielding varieties, legume, productivity, protein

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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