Judul: Produktivitas Penyadapan dan Pengumpulan Getah Pinus (Pinus merkusii) di RPH Wagir, BKPH Kepanjen, KPH Malang
Abstrak: Salah satu upaya meningkatkan produktivitas getah pinus yaitu dengan melakukan perhitungan untuk mengetahui besaran produktivitas. Faktor-faktor yang memengaruhi produktivitas penyadapan dan pengumpulan juga harus diketahui agar dapat menjadi evaluasi untuk meningkatkan produktivitas. Tujuan dari penelitian ini menganalisis nilai produktivitas dari penyadapan dan pengumpulan getah pinus dan menganalisis pengaruh kemiringan lahan, diameter, dan waktu kerja. Metode penelitian menggunakan time study. Hasil dari penelitian yang dilakukan diperoleh produktivitas penyadapan dan pengumpulan pada KU VI curam sebesar 21,262 pohon jam-1 dan 29,188 kg jam-1. KU VI datar produktivitas penyadapan sebesar 7,736 pohon jam-1 dan pengumpulan sebesar 15,344 kg jam-1. Produktivitas penyadapan dan pengumpulan KU IV curam sebesar 22,607 pohon jam-1 dan 34,371 kg jam-1. Produktivitas penyadapan dan pengumpulan pada KU IV datar sebesar 20,906 pohon jam-1 dan 30,839 kg jam-1. Faktor yang memengaruhi produktivitas pada penyadapan dan pengumpulan yaitu waktu kerja yang memiliki hubungan sangat kuat dan berbanding terbalik. Kemiringan lahan tidak memiliki hubungan terhadap produktivitas penyadapan dan pengumpulan. Diameter tidak memiliki hubungan juga terhadap produktivitas pengumpulan., One of the efforts, to increase the productivity of pine resin, is to do calculations to find out the amount of productivity. Factors that affect tapping and collection productivity should be identified so that they can be used as an evaluation in order to increase productivity. The purpose of this study is analyze the productivity of tapping and collecting pine resin and analyze the effect of the slope, diameter, and work time. This study method is time study. The result of the research conducted obtained tapping and collection productivity at KU VI steep is 21,262 trees hour-1and 29,188 kg hour-1. KU VI flat the productivity that is tapping of 7.736 trees hour-1and collection of 15.344 kg hour-1. The productivity of KU IV steep tapping and collecting is 22,607 trees hour-1 and 34,371 kg hour-1. In addition, the productivity of tapping and collection at KU IV flat is 20,906 trees hour-1 and 30,839 kg hour-1. The factors which affect productivity in tapping and collection are that working time which has a very strong and inversely significant correlation. The slope has no significant correlation to productivity in tapping and collection. The diameter has no significant correlation to productivity in the collection.
Keyword: pine resin, time study, working time, productivity

Judul: Factors Affecting the Productivity  of Pine Resin Tappers in KPH Sukabumi, West Java Province
Abstrak: Peningkatan produksi getah pinus bergantung terhadap produktivitas tenaga kerja penyadap. Faktor-faktor yang mempengaruhi produktivitas kerja penyadap antara lain adalah umur, jumlah anggota keluarga, jam kerja, insentif upah dan jumlah pohon pangkuan. Penelitian ini bertujuan untuk menganalisis faktor-faktor yang mempengaruhi produktivitas penyadap getah pinus di KPH Sukabumi. Penelitian dilakukan dengan metode analisis kuantitatif dengan wawancara terstruktur menggunakan bantuan kuesioner. Analisis data dilakukan dengan metode regresi linier berganda. Penentuan sampel dilakukan dengan metode purposive sampling dengan jumlah sampel yang ditentukan berjumlah 60 sampel. Hasil penelitian menunjukkan bahwa jumlah tanggungan keluarga, intensitas waktu penyadap, dan insentif pendapatan penyadap berpengaruh nyata terhadap produktivitas penyadap dengan nilai R square sebesar 98,93%. Sementara usia dan jumlah pohon pangkuan tidak berpengaruh nyata terhadap produktivitas penyadap. Faktor usia berbanding terbalik dengan produktivitas yang berarti semakin tinggi usia, maka tingkat produktivitasnya semakin menurun. Sementara faktor lain yang dianalisis berbading lurus dengan tingkat produktivitasnya., The increase in pine resin production depends on the productivity of tappers. The factors that affect the productivity of tappers include age, number of family members, working hours, wage incentives, and the load of trees that must be tapped. This study aims to analyze the factors that affect the productivity of pine resin tappers in KPH Sukabumi. The research was conducted using quantitative analysis methods with interviews using questionnaire. Sampling was determined using the purposive sampling with number of samples was 60 samples. Data analysis using multiple linear regression methods. The results showed that the number of family dependents, working hours, and the wage incentives had a significant effect on the productivity of tappers with an R Square value of 98.49%. Meanwhile, the age and load of trees that must be tapped had no significant effect on the productivity of tappers. The age factor is inversely proportional to productivity, meaning that the higher the age, the lower the productivity level. While other factors analyzed are directly proportional to the level of productivity.
Keyword: getah pinus, insentif pendapatan, penyadap, produktivitas

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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