Judul: Peningkatan pertumbuhan dan hasil panen beberapa tanaman sayuran daun melalui aplikasi pupuk kandang berfortifikasi.
Abstrak: The objective of this research was to study the effect of fortified animal manure application on growth and yield of several leafy vegetables, such as: kangkong (Ipomoea aquatica F.), caisin (Brassica rapa L.), and lettuce (Lactuca sativa L.). This research was conducted at Cikabayan Farm Unit, University Farm, IPB Darmaga Bogor from Februari to August, 2012. Six treatments (chicken manure, fortified chicken manure, goat manure, fortified goat manure, cow manure, fortified cow manure) were arranged in Randomized Complete Block Design with four replication for each vegetables as a single unit experiment. Chicken manure application produced higher yield. Chicken manure application produced 4.88 ton ha-1 kangkong, 9.60 ton ha-1 caisin, and 2.24 ton ha-1 lettuce. Moreover, the application of fortified animal manure increased kangkong yield up to 20% weight per plant, 17.78% marketable plant weight per bed and 19.76% root weight per plant.
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Judul: Pertumbuhan dan Produksi Kacang Bogor (Vigna subterranea (L.) Verdcourt) dengan Pelbagai Dosis dan Cara Pemberian Pupuk Kandang Ayam
Abstrak: This research aimed to get optimal rate of manure and proper manure application to increase crop production of bambara groundnut. The research was conducted from February to June 2014 at IPB experimental field. The experiment used factorial in randomized complete block design with two factors and three replications. The first factor was rates of chicken manure with four i.e. 0, 5, 10, and 15 tons ha-1. The second factor was 2 application methods of manure i.e. spread over the soil surface and put in planting row. Growth and production of bambara groundnut was insignificantly affected by neither manure rates nor manure applicaton methods. Although there was not significant effect of manure rates, there was indication that the highest yield (number of pods per plant) of bambara groundnut could be achieved with the addition of 6.8 tons manure ha-1. Bambara groundnut crop were heavily infected by desease at 7 weeks after planting, this might have resulted in insignificant effect of treatments to all variables.
Keyword: crop substitution, chicken manure, legume

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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