Judul: Optimizing Seed Size of Sweet Corn Varieties (Arinta IPB and Verona IPB) to Improve the Physiological Quality
Abstrak: Ukuran benih berkaitan dengan mutu fisiologis yang dihasilkan. Penelitian bertujuan untuk optimalisasi ukuran benih jagung manis varietas Arinta IPB dan Verona IPB untuk meningkatkan mutu fisiologis. Penelitian dilaksanakan pada November 2023 hingga April 2024 di Seed Center KP Leuwikopo IPB untuk proses pemilahan benih, dan di Laboratorium Penyimpanan dan Pengujian Mutu Benih, Departemen Agronomi dan Hortikultura IPB untuk pengujian mutu benih. Penelitian menggunakan Rancangan Acak Lengkap faktor tunggal dengan empat ulangan. Ukuran benih dibagi menjadi empat taraf ukuran, dengan varietas Arinta IPB berdiameter (besar: >8mm; sedang: 6,6-7,9 mm; dan kecil: <6,5 mm) serta varietas Verona IPB berdiameter (besar: >9 mm; sedang: 7,6-8,9 mm; dan kecil: <7,5 mm), dan ukuran campur (semua ukuran). Hasil percobaan menunjukkan bahwa ukuran benih jagung manis berpengaruh terhadap mutu fisiologis yang dihasilkan. Benih berukuran besar menghasilkan mutu fisiologis tertinggi dibanding dengan taraf ukuran lain. Viabilitas awal benih kedua varietas masih sangat tinggi yaitu lebih dari 80,0%. Jagung manis varietas Verona IPB memiliki bobot 1000 butir lebih tinggi dibandingkan Arinta IPB. Benih berukuran besar memiliki bobot 1000 butir lebih tinggi dibandingkan bobot 1000 butir awal (benih campuran), sementara benih berukuran sedang dan kecil memiliki bobot yang lebih rendah. Benih jagung varietas Arinta IPB dan Verona IPB memiliki variasi ukuran yang sangat tinggi. Proporsi tertinggi benih kedua varietas dimiliki oleh benih berukuran sedang yakni varietas Arinta IPB sebesar 70,3% dan Verona IPB 57,1%. Viabilitas dan vigor lot benih jagung manis kedua varietas terbukti dapat ditingkatkan dengan mengeliminasi benih berukuran kecil. Implementasi pemilahan benih untuk meningkatkan viabilitas dan vigor benih jagung manis varietas Verona IPB perlu menjadi perhatian karena proporsi benih berukuran kecil cukup tinggi sebesar 27,0%., The size of seeds is related to the physiological quality produced. This research aims to optimize the seed size of the sweet corn varieties Arinta IPB and Verona IPB to improve physiological quality. The research was carried out from November 2023 to April 2024 at the Seed Center of KP Leuwikopo IPB for seed sorting processes and at the Seed Storage and Quality Testing Laboratory, Department of Agronomy and Horticulture IPB for seed quality testing. The research used a randomized complete design (RCD) with a single factor and four replications. The seed sizes are divided into four categories, with the Arinta IPB variety having diameters: (large: >8mm; medium: 6,6-7,9 mm; and small: <6,5 mm) and the Verona IPB variety has diameters as follows: (large: >9 mm; medium: 7,6-8,9 mm; and small: <7,5 mm), and mixed sizes (all sizes). The experimental results showed that the size of sweet corn seeds influences the physiological quality produced. Large seeds produce the highest physiological quality compared to other size level. The initial viability of seeds for both varieties was still very high, over 80,0%. The sweet corn variety Verona IPB had a higher 1000-seed weight compared to Arinta IPB. Large seeds had a higher 1000-seed weight compared to the initial 1000-seed weight (mixed seeds), while medium and small seeds had lower weights. The Arinta IPB and Verona IPB varieties had very high variation in size. The highest proportion of seeds for both varieties is found in medium sized
Keyword: mutu fisik, mutu fisiologis

Judul: Effect of Seed Size on Physiological Quality of Mung Bean Seed Varieties Vima 4 and  Vimil 1
Abstrak: Kebutuhan konsumsi nasional kacang hijau mengalami peningkatan, akan tetapi besaran luas panen mengalami penurunan dan diikuti dengan penurunan hasil produksi. Salah satu upaya yang dapat dilakukan adalah meningkatkan produksi kacang hijau dengan menggunakan benih yang bermutu. Mutu benih dipengaruhi oleh ukuran benih. Penelitian ini bertujuan menganalisis pengaruh ukuran benih terhadap mutu fisiologis benih kacang hijau varietas Vima 4 dan Vimil 1. Penelitian ini disusun dalam Rancangan Acak Lengkap faktor tunggal yaitu ukuran benih dengan empat taraf ukuran (besar, sedang, kecil dan campuran). Taraf ukuran campuran terdiri atas benih dengan diameter yang beragam. Hasil penelitian menunjukkan bahwa ukuran benih varietas Vima 4 berpengaruh terhadap daya berkecambah, indeks vigor, bobot kering kecambah normal, laju imbibisi dan nilai daya hantar listrik. Benih berukuran besar memiliki nilai daya berkecambah 94%, indeks vigor 86%, laju imbibisi 3,75 ml/jam dan nilai daya hantar listrik sebesar 23,29 μS/cm. g. Pada varietas Vimil 1, ukuran benih tidak berpengaruh terhadap daya berkecambah, indeks vigor dan daya berkecambah setelah pengusangan. Ukuran benih sedang dan besar memiliki daya berkecambah paling tinggi 91.3% dan indeks vigor 80,6%., National consumption needs of mung beans has increased, but the amount of harvested area has decreased and is followed by a decrease in production yields. One of the efforts that can be done is to increase the production of mung beans by using quality seeds. Seed quality is influenced by seed size. This study aimed to analyze the effect of seed size on the physiological quality of mung bean seeds of Vima 4 and Vimil 1 varieties. This research was arranged in a single factor Completely Randomized Design, namely seed size with four size levels (large, medium, small and mixed). The mixed size level consists of seeds with various diameters. The results showed that the seed size of the Vima 4 variety had an effect on germination, vigor index, dry weight of normal germination, rate of imbibition and electrical conductivity. Large seeds have a germination value of 94%, a vigor index of 86%, an imbibition rate of 3.75 ml/hour and an electrical conductivity value of 23.29 S/cm.g. In Vimil 1 variety, seed size had no effect on germination, vigor index and germination after aging. Medium and large seed sizes had the highest germination rate of 91.3% and vigor index of 80.6%.
Keyword: imbibition, germination, seed diameter, vigor

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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