Judul: Growth Characteristics of Mutant Lamtoro Var.  Tarramba Acid Tolerant pH 3.4 on Field Scale at JASTRU Jonggol
Abstrak: Peningkatan adaptabilitas mutan lamtoro var. tarramba pada kondisi masam pH 3,4 diharapkan tidak menurunkan potensi adaptasinya pada lingkungan normal skala lapang. Evaluasi karakteristik pertumbuhan mutan tanaman lamtoro var. tarramba pada skala lapang dilaksanakan di Unit Pendidikan dan Penelitian Peternakan Jonggol (UP3J). Tujuan penelitian ini adalah mengevaluasi karakteristik pertumbuhan mutan lamtoro var. tarramba toleran masam pH 3,4 pada skala lapang di UP3J. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan 11 mutan lamtoro (T1-T11) yang terdiri dari masing masing lima ulangan dan lamtoro kontrol positif (T0) yang terdiri dari empat ulangan. Data morfologi (tinggi tanaman, diameter batang, jumlah ranting, dan jumlah tangkai induk daun majemuk) dianalisis dengan sidik ragam (ANOVA). Hasil yang berbeda nyata dilakukan analisis lanjut DMRT. Data warna tanah rizosfer, pH rizosfer, warna daun, dan serangan hama kutu loncat dianalisis secara deskriptif. Variabel penelitian terdiri dari warna tanah rizosfer, pH tanah rizosfer, tinggi tanaman, diameter batang, jumlah ranting, jumlah tangkai induk daun majemuk, warna daun, dan serangan hama kutu loncat. Hasil penelitian menunjukkan mutan T10, T11, dan T12 menghasilkan nilai pH akhir rizosfer yang cenderung lebih masam dibandingkan tanaman lainnya. Mutan tanaman lamtoro var. tarramba toleran masam pH 3,4 pada media tanah kategori agak masam hingga netral memberikan hasil sama baik dengan kontrol positif lamtoro var. tarramba pada parameter karakteristik morfologi, warna daun, serta serangan hama kutu loncat, Improved adaptability of lamtoro var. tarramba in acid condition pH 3.4 in controlled enviroments is expected not to reduce its potential adaptation in the normal environment of the field scale. Evaluation of the growth characteristics of lamtoro var. tarramba mutant on the filed scale was carried out at the Jonggol Animal Science Teaching and Research Unit (JASTRU). The aim of this study is to evaluate the growth characteristics of lamtoro var. tarramba mutant acid tolerant pH 3.4 on a field scale at JASTRU. This study was designed by using Randomized Block Design (RBC) with 11 lamtoro mutants (T1-T11) consisting of five replications and positive control lamtoro (T0) consisting of four replications. Morphological data (plant height, stem diameter, number of twigs, and number of compound leaf stalks) were analyzed using analysis of variance (ANOVA). The significant different result futher analyzed with DMRT. Data of rhizosphere soil color, rhizosphere pH, leaf color, and fleas attack were analyzed descriptively. Observed variables consisted of rhizosphere soil color, rhizosphere pH, plant height, stem diameter, number of twigs, number of stalks of compound leaf, leaf color, and fleas attack. The results showed mutants with code T10, T11, and T12 produced the final rhizosphere pH more acidic than others. Mutant of lamtoro var. tarramba acid tolerant pH 3.4 on moderately acidic to neutral soil media is as good as positive control of lamtoro var. tarramba on morphological characteristics, leaf color, and attack of fleas variables.
Keyword: genetics, growth characterstics, lamtoro var. tarramba mutant, nutrient uptake

Judul: Keragaman Morfologi Mutan Lamtoro (Leucaena leucocephala cv. Tarramba) Pasca Iradiasi 40 Gy Tahan Asam pH 3.4
Abstrak: Penelitian ini bertujuan untuk mengetahui Keragaman morfologi dari mutan tanaman lamtoro pasca iradiasi 40 gy yang tahan asam pH 3.4 dan mencari pertumbuhan yang terbaik. Tanaman pakan yang digunakan adalah mutan lamtoro (Leucaena leucocephala cv. Tarramba) pasca iradiasi 40 gy tahan asam pH 3,4 dengan 5 nomor mutan lamtoro dan 1 jenis lamtoro (Leucaena leucocephala cv. Tarramba) murni. Penelitian ini menggunakan rancangan lingkungan acak lengkap (RAL) dengan analisis ragam (ANOVA) dan jika ada signifikasi akan diuji lanjut menggunakan Duncan. Perlakuan dengan taraf level pemberian BAP yang sama yaitu: 0,5 ppm terhadap 2 macam eksplan lamtoro terdiri dari eksplan lamtoro kontrol dan eksplan lamtoro pada 5 nomor mutan berbeda: L1V5, L2V3, L4V2, L5V2, dan L13V1. Dimana huruf “L” melambangkan mutan dan nomor pada (L1, L2, L4, L5, dan L13) merupakan nomor mutan. Sedangkan huruf “V” melambangkan generasi dari lamtoro setelah di subkultur dan nomor setelah “V” menandakan telah berapa kali tanaman lamtoro di subkultur. Analisis ragam menunjukkan parameter pertambahan tinggi tanaman berbeda nyata (P<0.05) serta parameter jumlah ranting, jumlah daun majemuk, persentase kerontokan daun, tidak berbeda nyata (P>0.05). Berdasarkan uji yang dilakukan pertumbuhan terbaik ditunjukkan oleh lamtoro dengan nomor mutan L5V2.
Keyword: keragaman, lamtoro, mutan, tarramba

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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