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: Respons Pertumbuhan Rasamala (Altingia excelsa Noronha) Menggunakan Teknik Lateral Root Manipulation (LRM) di PT Cibaliung Sumberdaya.
Abstrak: Kegiatan pertambangan menyebabkan penurunan produktivitas tanah. Tanah kompak merupakan permasalahan dominan yang terjadi di PTCSD dan pemicu terjadinya stagnasi pertumbuhan tanaman. Lateral root manipulation (LRM) merupakan teknik yang dapat digunakan untuk memperbaiki stagnasi pertumbuhan tanaman akibat tanah kompak. Teknik ini bertujuan merangsang pertumbuhan akar baru untuk mendorong penyerapan air dan unsur hara agar tanaman dapat melakukan metabolisme dengan normal. Penelitian dilakukan dengan metode rancangan acak lengkap faktorial (RALF) dengan 2 faktor. Faktor pertama adalah pemberian kompos dan faktor kedua adalah pemberian growth stimulant. Hasil penelitian menunjukkan bahwa teknik LRM dengan manipulasi faktor kompos dan growth stimulant dapat memperbaiki pertumbuhan rasamala. Pertambahan panjang kuncup memberikan respons yang paling tinggi pada perlakuan interaksi kompos 1 kg + growth stimulant 1.6%. Jumlah tunas baru memberikan respons yang paling baik pada perlakuan interaksi kompos 1 kg + growth stimulant 1.6%.
Keyword: growth stimulant, kompos, lateral root manipulation (LRM), stagnasi pertumbuhan, tanah kompak

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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