Judul: Characterization and Evaluation of Eight Foxtail Millet Genotypes (Setaria italica L. Beauv) from Exploration
Abstrak: Hotong (Setaria italica L. Beauv) ialah sumber karbohidrat yang mampu beradaptasi baik di lingkungan kering dan kurang subur. Tanaman ini memiliki kandungan protein, kalsium, dan antioksidan yang cukup tinggi dibandingkan padi dan jagung. Pemanfaatan hotong sebagai sumber pangan di Indonesia masih terbatas karena belum adanya varietas unggul hotong yang dilepas. Penelitian ini bertujuan mengetahui karakter agronomi dan karakter morfologi dari empat genotipe hotong hasil eksplorasi dan empat genotipe pembandingnya. Percobaan dilaksanakan pada bulan Februari - September 2021 di Kebun Percobaan Cikabayan Bawah IPB. Penelitian ini terdiri atas tiga percobaan, setiap percobaan disusun berdasarkan rancangan kelompok lengkap teracak (RKLT) faktor tunggal dengan delapan ulangan. Bahan penelitian yang digunakan terdiri atas empat genotipe hasil eksplorasi yaitu Hambapraing, Mauliru#2, Toraja, dan NTB-1, dan empat genotipe pembanding yaitu ICERI-5, ICERI-6, Botok-4, dan Botok-10. Berdasarkan scatter plot dan dendrogram yang dibangun, delapan genotipe yang diamati terbagi menjadi dua kelompok besar. Kelompok A terdiri dari genotipe ICERI-5, ICERI-6, dan Toraja dengan produktivitas yang rendah dan umur panen yang singkat. Kelompok B terdiri dari genotipe Mauliru#2, Hambapraing, NTB-1, Botok-4, dan Botok-10 dengan produktivitas yang tinggi dan umur panen yang cukup lama., Foxtail millet (Setaria italica L. Beauv) is a source of carbohydrates that adapt well in dry and less fertile environments. Foxtail millet contains higher protein, calcium, and antioxidants compared to rice and corn. The utilization of foxtail millet in Indonesia as food is still limited and there is no superior variety of foxtail millet has been released in the country. The objective of this study was to characterize foxtail millet genotypes collected from exploration. The study was conducted from February - September 2021 at the Cikabayan Experimental Field, IPB University. The study consisted of three experiments, each experiment was arranged in a randomized complete block design (RCBD) with eight replications. Foxtail millet genotypes used in this study were four genotypes collected from exploration activity namely Hambapraing, Mauliru#2, Toraja, and NTB-1, and four check genotypes namely ICERI-5, ICERI-6, Botok-4, and Botok-10. Based on the constructed scatter plot and dendrogram, the eight observed genotypes were divided into two large groups. Group A consists of the genotypes ICERI-5, ICERI6, and Toraja with low productivity and early maturity. Group B consists of genotypes Mauliru #2, Hambapraing, NTB-1, Botok-4, and Botok-10 with high productivity and late maturity.
Keyword: cereals, characterization, diversity, exploration, productivity

Judul: Characterization Physicochemical of 18 Foxtail Millet (Setaria italica (L.) Beauv) Genotypes
Abstrak: Hotong (Setaria italica (L.) Beauv) merupakan salah satu tanaman penting yang berasal dari Tiongkok. Tanaman hotong adalah salah satu tanaman pangan yang berpotensi menjadi sumber karbohidrat alternatif. Hotong dapat tumbuh di daerah arid dan semi arid, karena siklus hidupnya yang pendek dan toleran salinitas, serta toleran kekeringan . Kandungan nutrisi biji genotipe-genotipe hotong tersebut juga diduga bervariasi. Penelitian telah dilaksanakan di Technopark, Laboratorium Dasar Instrumen Teknikdan Laboratorium Pengemasan Fateta, IPB pada bulan Mei – September 2018. Genotipe hotong yang menjadi bahan penelitian yaitu ICERI 1 – ICERI 10, Botok 2, Botok 4, Botok 8, Botok 10, Botok 12, Botok 15, Botok 19, dan Padang, serta dengan bahan pembanding beras dan sorgum. Analisis fisik yang dilakukan meliputi analisis warna, bulk density atau densitas kamba dan efektivitas penepungan atau rendemen. Analisis sifat kimia yang dilakukan meliputi analisis kadar air, analisis kadar abu dan analisis kadar lemak. 18 genotipe hotong yang diuji memperoleh hasil sifat fisik dan sifat kimia yang bervariasi. Secara keseluruhan kualitas hotong dapat diterima, dibandingkan dengan beras dan sorgum., Foxtail millet (Setaria italica (L.) Beauv) is one of the important plants from China. Foxtail millet plants are one of the food crops that have the potential to be an alternative carbohydrate source. Foxtail millet can grow in arid and semi-arid regions, because of its short life cycle and salinity tolerance, and drought tolerance. The nutrient content of foxtail millet the genotypes is also suspected to vary. Research has been carried out at Technopark, Basic Laboratory of Technical Instruments and Packaging Laboratories, Fateta, IPB in May - September 2018. Foxtail millet genotypes which are the subject of research are ICERI 1 - ICERI 10, Botok 2, Botok 4, Botok 8, Botok 10, Botok 12, Botok 15, Botok 19, and PADANG, and with comparative ingredients for rice and sorghum. Physical analysis carried out includes color analysis, bulk density or the effectiveness of capping and yield. Analysis of the chemical properties carried out include water content analysis, ash content analysis and fat content analysis. 18 foxtail millet genotypes tested obtained various physical and chemical properties. Overall the quality of foxtail millet is acceptable, compared to rice and sorghum.
Keyword: Analysis, food crops, nutrient content, rice, sorghum

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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