Judul: The Influence of Incision Width on Pine Resin Productivity in Gunung Gede Pangrango National Park
Abstrak: Pemanfaatan hasil hutan bukan kayu yang dilakukan terus menerus dan secara berlebihan di kawasan taman nasional khususnya penyadapan getah pinus dapat menyebabkan kerusakan pada pohon. Guna mengurangi resiko kerusakan tersebut namun tetap memperhatikan kebutuhan masyarakat sekitar hutan, maka perlu dilakukan perbaikan metode. Penelitian ini bertujuan untuk menganalisis produktivitas penyadapan getah pinus metode koakan dengan tiga ukuran alat sadap. Hasil penelitian menunjukkan bahwa lebar alat sadap dan jenis stimulan memberikan pengaruh nyata terhadap produktivitas getah pinus. Sebaiknya penyadapan getah pinus di Taman Nasional Gunung Gede Pangrango menggunakan alat sadap 4 cm atau 3 cm., The continuous and excessive utilization of non-timber forest products in national parks, especially the tapping of pine resin, can lead to damage to the trees. In order to reduce the risk of such damage while still addressing the needs of the local community, it is necessary to improve the methods. This research aims to analyze the productivity of pine resin tapping using the quarre method with three different tool sizes. The results of the study indicate that the width of the tapping tool and the type of stimulant significantly affect pine resin productivity. It is advisable to use a 4 cm or 3 cm tapping tool for pine resin tapping in Gunung Gede Pangrango National Park.
Keyword: quarre method, productivity, incision width, stimulants, pine resin

Judul: Pengaruh Perlakuan Inovasi Penyadapan Getah Pinus terhadap Produktivitas Penyadap (Kasus : Hutan Pendidikan Gunung Walat, Kabupaten Sukabumi, Provinsi Jawa Barat).
Abstrak: Pine resin is one of non timber forest products that utilized in Indonesia. The demand of pine resin in Indonesian industry has been increased every year. Therefore, the need for an effort to increased the productivity of pine resin. Gunung Walat Educational Forest (GWEF) is one of educational forest that producing pine resin in Indonesia. Amount of pine resin production in diHPGW increased every year, so needs to be reviewed of tapping treatment that can be incresed the tappers productivity. Respondent taken by cencus method with the number of respondents are 25 people. The respondents is selected from tapper of pine resin that still active in tapping of pine resin in HPGW. Processing of data was done by descriptive and presentation of data are carried out by tabulating and graphing. The result of lead is made by monthly lead cumulative and sorted based on time of use tapping treatment. The tapping treatment are used that working motivation, employment contract, wage rates and results of research. Based on this research showed that treatment that give more effect to increase the leads of pine resin in HPGW are working motivation and results of research. Increase the leads of pine resin because working motivation treatment is 317 kg/month. This is due to the span time that used is longer and the working motivation treatment are tapper’s favourite. The tapper’s perception to tapping treatment that most to increase the leads of pine resin is results of research as 36,8%. Because of short period that used, can make leads of pine resin higher as 203,97 kg/month. Moreover, applicate the result of research didn’t have negative impact so tapper very liked it.
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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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