Judul: Pengaruh Pemupukan dan Pemberian Urin Sapi Terhadap Pertumbuhan dan Tingkat ProduktivitasMedicago sativa L
Abstrak: Medicago sativa L (Alfalfa) is one of kind legume comes from Iran (Cheeke 2005). This research was conducted to measureeffect of fertilized with manure and urin of cattleforgrowth and production of alfalfa with same value of nitrogen where was tried in Ciwidey, Bandung. This research used Randomized Complete Design (RCD) with 5 treatments and 3 replications. The treatment were P1 (NPK (control) 15 g m-2), P2 (manure of chicken 0.33 kgm-2), P3 (manure of cattle 1 kgm-2), P4 (manure of chicken 0.17 kgm-2+ urine 0.3 litersm-2), and P5 ( manure of cattle 0.5 kgm-2+ urine 0.3 litersm-2). The observation was the response of plant which include presentage of seed, plant height, total leaf, as feed and dry matter of leaf and stem, crude protein and crude fiber. The result showed that the treatment of iso nitrogen which fertilized with manure and urin of cattle is not significant togrowth and productivity of alfalfa. Another result of this reaserch is the treatment P4 (manure of chicken 0.17 kgm-2+ urine 0.3 litersm-2) can subtitution NPK and showed the better growth, productivity and crude protein of alfalfa than NPK treatment.
Keyword: alfalfa, iso nitrogen, manure, production, urine

Judul: Pemanfaatan Limbah Ternak Sebagai Pupuk Cair Organik Untuk Meningkatkan Pertumbuhan Dan Produksi Selada (Lactuca Sativa Var. Crispa)
Abstrak: The research are to determine the effect of organic liquid fertilizer derived from manure and urine of cattle, urine of sheep, urine of rabbits and combination between of manure and urine on growth, production, physical quality and freshness of lettuce (Lactuca sativa var. crispa) and to find the best organic liquid fertilizer. The experiment was conducted in the Vegetable Garden, University Farm Cikabayan Bogor Agricultural University, Dramaga, Bogor (processing of organic liquid fertilizer and planting) in December 2010 until February 2011 and Postharvest treatment in the Laboratory of Production, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural University in March 2011. The Method of this research is Randomize Complete Block Design with one factor. The treatment are kinds of organic liquid fertilizer with three replicates. The treatments are treatment without liquid fertilizer application (just water), liquid fertilizer from urine of cattle, liquid fertilizer from urine of sheep, liquid fertilizer urine of rabbit, liquid fertilizer from manure of cattle, liquid fertilizer from combination between manure and urine of cattle, liquid fertilizer from combination between manure of cattle and urine of sheep, liquid fertilizer from combination between manure of cattle and urine of rabbit. The results indicate that the liquid fertilizer does not significantly affect the growth, production, physical quality and freshness of lettuce. This means that, each treatment gives the same effect for all parameters.
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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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