Judul: Pertumbuhan Tanaman Sengon Buto (Enterolobium cyclocarpum Griseb.) dengan Teknik Lateral Root Manipulation (LRM) di PT Cibaliung Sumberdaya, Banten
Abstrak: Mining activities have impacted to decrease soil productivity and soil compaction. Lateral Root Manipulation (LRM) is one technique that can be used overcome the stagnation of the plant. LRM technique is cutting off the lateral root. The purpose of this research to find the response from sengon buto in post gold mine land in PT Cibaliung Sumberdaya, Banten. This research was done by using the factorial randomized block design method with 3 factors. The first factor is lateral roots cutting, the second is root and microbe stimulant application, and the third is polymer fertilizing. The results indicate the treatment of lateral roots cutting by LRM technique, the root and microbe stimulant application, and fertilizing can stimulate the growth of stem diameter and height. The combination treatment of lateral roots cutting and root and microbe stimulant application is significant to diameter growth. Single method cutting lateral root is significant to height growth.
Keyword: sengon buto., root and microbe stimulant, LRM, fertilizer polymer

Judul: Perbaikan Pertumbuhan Tanaman Sengon (Paraserianthes falcataria (L.) Neilsen) dengan Teknik Lateral Root Manipulation (LRM) di Bojong Jengkol, Kabupaten Bogor
Abstrak: Sengon is a fast growing tree species that has good adaptation. But when the land have been compacted and densited, sengon shows dwarfed growth. A lateral root manipulation (LRM) is one of cultivating plants that can fix the growth of plants. The study is aimed to know the effect of LRM technique on the sengon improvment growth. The methodology applied the factorial randomized design method which have three factors. The first factor is to cut the lateral root, the second is to apply stimulantion on root and microbe, and the third is to fertilize periodic. The results show that combination cutting root and fertilize periodic without applying stimulantion on root and microbe increase height improved 10,45 cm per week and number of bud 10 peices per week. All treatments did not effect on the stem diameter. The variables of the treatment visualy dont changes significally color of leaf and new root growing. However, the treatment of cutting root can stimulate to grow a new root.
Keyword: Bogor Agricultural University (IPB), root and microbe stimulant, Paraserianthes falcataria, lateral root manipulation, fertilize

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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