Judul: Uji daya hasil dan kualitas jagung manis (Zea mays var saccharata Sturt.) genotipe SD-3 serta empat varietas pembanding di Kabupaten Majalengka
Abstrak: Percobaan ini dilakukan untuk mengevaluasi daya hasil dan kualitas serta penampilan jagung manis (Zea mays var. saccharata Sturt.) genotipe SD-3 yang diproduksi oleh IPB dengan empat varietas komersial lainnya sebagai pembanding yang dilaksanakan di Desa Dukuh Asem Kabupaten Majalengka sebagai salah satu sentra jagung manis di Indonesia pada bulan April-Juli 2012 dengan ketinggian 400 m dpl. Hipotesis penelitian ini adalah diduga bahwa genotipe SD-3 mampu dikembangkan menjadi varietas yang bersaing dengan varietas pembanding di pasar komersial berdasarkan uji daya hasil, kualitas, dan penampilan jagung manis. Penelitian ini menggunakan rancangan kelompok lengkap teracak (RKLT) dengan faktor tunggal. Setiap varietas diulang sebanyak empat kali sehingga terdapat 20 satuan percobaan. Bahan tanam yang digunakan yaitu, genotipe SD-3 sebagai kontrol, sedangkan varietas pembandingnya antara lain Supersweet, Bonanza, Sweetboy, dan SG 75. Setiap satuan percobaan terdiri atas plot berukuran 4 x 5 m2. Jarak antar plot 0.5 m dan jarak antar blok 1.5 m. Setiap satu plot terdiri dari lima baris tanaman dengan jarak tanam antar baris 76 cm dan dalam baris 25 cm. Setiap lubang tanam terdiri atas dua benih jagung manis. Pengamatan dilakukan dengan mengambil 10 tanaman contoh dalam setiap satuan percobaan. Penyerbukan sendiri dilakukan pada dua tanaman selain tanaman contoh di setiap plot saat tanaman berumur 46–53 hari setelah tanam (HST). Hasil pengamatan terhadap peubah kuantitatif diuji F untuk menganalisis pengaruh perlakuan. Pada peubah yang berpengaruh nyata dilakukan uji nilai tengah menggunakan uji Dunnettpada taraf 5%.
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Judul: Daya Hasil dan Kualitas Jagung Manis (Zea mays var. saccharata Sturt.) Genotipe SD-3 dengan Empat Varietas Pembanding di Kabupaten Bogor
Abstrak: This research was a trial step in order to study the potential of SD-3 sweet corn genotype to be developed into high-yielding variety which is able to compete with commercial varieties. The experiment used Randomized Complete Block Design, single factor, with five treatments and four replications. The treatment consisted of one sweet corn genotype (SD-3) and four comparison varieties (Super Sweet, Bonanza, Sweet Boy, and Sugar 75). This experiment was aimed to evaluate the appearance, yield and quality of SD-3 genotype with four comparison varieties in Bogor by observing agronomic character in the field, vegetative and generative growth, production potential as well as quantity and quality of crop. Data was analyzed with ANOVA (F-test) then continued with Dunnet test (α = 5 %) and Pearson correlation coefficient. The results of research showed that there was a significant different in several quantitative variables of sweet corn. Genotype treatment did not significantly affect on the productivity. Based on comparative advantage, SD-3 genotype is better than all comparison varieties
Keyword: sweet corn, evaluation, character, advantage, Bogor Agricultural University (IPB)

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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