Judul: Pine Descent Test Border Oleoresin Productivity at KPH Banyumas Barat
Abstrak: Pinus yang ditanam di kawasan KPH Banyumas Barat berasal dari hasil uji keturunan dan tanaman reguler. Penyadapan oleoresin pinus dilakukan pada areal KPH dan areal Pusat Penelitian Perhutani. Penelitian ini bertujuan untuk mengukur produktivitas oleoresin pinus border uji keturunan di KPH Banyumas Barat tahun tanam 2007 dan 2011 menggunakan alat bor mekanis dengan ukuran mata bor 5/8 inch. Hasil penelitian menunjukkan bahwa asal tanaman mempunyai pengaruh nyata terhadap produktivitas oleoresin pinus. Produktivitas rata-rata tanaman tahun tanam 2007 sebesar 3,41 g/pohon/hari dan produktivitas rata-rata tanaman tahun tanam 2011 sebesar 2,83 g/pohon/hari. Tanaman reguler memiliki produktivitas rata-rata sebesar 2,66 g/pohon/hari dan tanaman border uji keturunan memiliki produktivitas rata-rata sebesar 3,58 g/pohon/hari. Tanaman border uji keturunan memiliki hasil yang lebih tinggi dibandingkan tanaman reguler karena pengaruh perlakuan silvikultur yang lebih intensif serta asal bibit yang dipilih dari pohonpohon indukan yang terbaik dibandingkan dengan tanaman reguler, sehingga dengan mempertimbangkan kondisi tersebut pohon pinus border uji keturunan merupakan alternatif yang paling tepat untuk meningkatkan produktivitas oleoresin pinus., Pines planted in the KPH Banymas Barat area come from the results of descent tests and regular plants. Pine oleoresin tapping was carried out in the KPH area and the Perhutani Research Center area. This study aims to measure the productivity of pine oleoresin at the location of the descent test border and regular plants in KPH Banyumas Barat in 2007 and 2011 using a mechanical device with a drill bit size of 5/8 inch. The results showed that plant origin had a significant effect on the productivity of pine oleoresin. The average plant productivity for the 2007 planting year was 3.41 g / tree / day and the average productivity in 2011 was 2.83 g / tree / day. Regular plants have an average productivity of 2.66 g / tree / day and test border plants have an average productivity of 3.58 g / tree / day. The descent test border plants had higher productivity than regular plants because of the effect of a more intensive silvicultural treatment and the origin of the selected seeds from the best parent trees compared to regular plants, taking into these conditions the lineage test border pine tree is the most appropriate alternative to increase pine oleoresin productivity.
Keyword: Pine tapping productivity, Plant origin, Planting year, Tapping method

Judul: Pengaruh Ukuran Lubang Sadap terhadap Produktivitas Oleoresin Pinus Hasil Uji Keturunan di KPH Banyumas Barat
Abstrak: Tanaman hasil uji keturunan menghasilkan pohon Pinus merkusii yang menghasilkan produksi oleoresin tinggi. Penyadapan oleoresin pinus di KPH Banyumas Barat masih menggunakan metode quarre. Penelitian bertujuan untuk mengukur produktivitas penyadapan oleoresin pinus, menentukan pengaruh sub galur dan ukuran lubang sadap terhadap produktivitas oleoresin pinus. Penelitian ini menggunakan metode bor rancangan faktorial 5 x 3 yaitu sub galur Jatim 1, Jatim 2, Cijambu, Sempolan dan pohon pinus reguler sebagai kontrol dengan perlakuan ukuran mata bor 13 mm, 16 mm, dan 19 mm. Sub galur Jatim 1 memperoleh hasil tertinggi pada rata-rata produktivitas oleoresin menggunakan 3 ukuran mata bor yaitu secara berurut sebesar 4,98 g/pohon/hari, 3,74 g/pohon/hari dan 4,26 g/pohon/hari. Sub galur Jatim 2 menghasilkan produktivitas paling rendah menggunakan 3 ukuran mata bor secara berurut sebesar 3,39 g/pohon/hari, 2,96 g/pohon/hari dan 2,91 g/pohon/hari. Sub galur dan ukuran lubang sadap masing-masing mempengaruhi produktivitas oleoresin. Mata bor ukuran 13 mm memperoleh total rata-rata produksi oleoresin tertinggi yaitu 19,70 g/pohon/hari sedangkan mata bor ukuran 19 mm memperoleh total rata-rata produksi oleoresin terendah yaitu 15,28 g/pohon/hari.
Keyword: drill bit size, oleoresin, productivity

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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