Judul: Feasibility of The Hybrid Corn Seed Production Development PT Agricorn Putra Sejati Solok City
Abstrak: Upaya yang dapat dilakukan untuk pemenuhan pasokan jagung adalah dengan meningkatkan produktivitas menggunakan benih unggul seperti benih jagung hibrida. PT Agricorn Putra Sejati merupakan produsen benih jagung hibrida yang berencana untuk menambah kapasitas produksi. Penelitian ini bertujuan untuk mengetahui kelayakan pengembangan usaha dan menganalisis perubahan maksimum pada harga pupuk dan upah tenaga kerja tetap. Penelitian ini menggunakan skenario yaitu skenario I (kondisi tanpa pengembangan), skenario II (kondisi pengembangan dengan sistem padat karya), dan skenario III (kondisi pengembangan dengan lebih banyak menggunakan tenaga mesin). Penelitian ini menggunakan aspek non finansial (aspek pasar, aspek teknis, aspek manajemen dan hukum, aspek sosial, ekonomi, dan budaya, serta aspek lingkungan), aspek finansial (NPV, Net B/C, IRR, Payback Period), dan analisis nilai pengganti. Hasil penelitian menunjukkan perusahaan layak untuk dikembangkan dan akan memperoleh manfaat bersih lebih tinggi jika menggunakan skenario III. Berdasarkan analisis nilai pengganti, perusahaan lebih sensitif terhadap kenaikan upah tenaga kerja daripada kenaikan harga pupuk.
Keyword: seeds, investment, hybrid corn, feasbility, development

Judul: Peningkatan Produksi Benih Jagung Hibrida melalui Optimalisasi Populasi dan Rasio Tetua Jantan Betina
Abstrak: Attempts to increase seed yield of hybrid corn has been done, but the results have not been satisfactorily achieved. Researches should be done in various aspects such as row ratio of parents, planting density, optimum days to harvest and influence of climatic factors (sunlight and rainfall), season and agroecology. The aim of study are to obtain optimum plant population and rasio of male to female parents for increasing seed yield of hybrid corn and to study seed quality of Bima 3 and STJ-01 varieties. The seeds used in the research were parents of Bima 3 (Nei90008 line as female, Mr14 line as male) and STJ-01 (Bima 5 variety as female, Nei9008 line as male). The experiment was arranged in a randomized complete block design with two factors and three replications (replications was nested in factor of parent ratio). The first factor was male to female parent ratio (1:4, 1:5 and 2:6) and the second factor was plant population (66 667 plants/ha, 83 333 plants/ha and 90 000 plants/ha). Combined analysis of variance was performed to understand the effects of both factors and their interactions. The results showed that plant population did not significantly affect plant height of Bima 3 and STJ-01 parents, ear height of Bima 3 and STJ-01 female parents, leaf area index of STJ-01 female parent, number of ear of Bima 3 female parent, ear weight of Bima 3, and seed yield of Bima3 and STJ-01. The effect of parents ratio was significant for seed yield of Bima 3 and STJ-01. The highest seed yield of Bima 3 variety was achieved at parent ratio 1: 5 (1.43 tons/ha) and the highest seed yield of STJ-01 was achieved at parent ratio 1:4 (3 tons/ha). Seed quality of Bima 3 variety was better than that of STJ-01. The seedling growth of Bima 3 was more simultaneous more tolerant to drought based on germination percentage and speed of germination and more tolerant to salinity based on the number of green leaves.
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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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