Judul: Analisis Kerusakan Komponen dan Produktivitas Gergaji Rantai di Perum Perhutani Divisi Regional Jawa Timur KPH Madiun
Abstrak: The correct usage of chainsaw will increase the logging productivity. In the other hand, the incorrect usage will cause loss such as decline of the productivity, damage to the chainsaw and also causing occupational accident for the operator. The objectives of this research to find out the damage component, the cause of the damage component in chainsaw and also to find out the effect of the damage component towards logging productivity. The data was collected by analyzing the damage component, the cause of the damage chainsaw component and also by analyzing the effect of the damage component towards logging productivity. The analysis of the damage chainsaw component show that the most frequently damage component are chain, spark plug, piston and sprocket. The lack of understanding about the correct maintenance and treatment way for the tools and the usage of non-original part is one of the factors that cause the damage. The damage of chainsaw component can influence the non-effective work hours which result in the size of productivity.
Keyword: Bogor Agricultural University (IPB), productivity, influence, damage, component, chainsaw

Judul: Identifikasi Kerusakan Komponen Chainsaw Serta Pengaruhnya Terhadap Produktivitas Penebangan Di PT Inhutani Ii Pulau Laut Kalimantan Selatan
Abstrak: Pengetahuan tentang pemakaian dan pemeliharaan chainsaw mutlak diperlukan bagi setiap operator. Penggunaan chainsaw yang tepat akan meningkatkan produktivitas dan penggunaan chainsaw yang tidak tepat akan menyebabkan kerugian berupa kecelakaan kerja, kerusakan alat serta penurunan produktivitas. Mengetahuai komponen-komponen chainsaw dan fungsi-fungsinya akan memudahkan operator dalam pemeliharaan chainsaw yang mereka miliki. Hasil analisis kerusakan komponen chainsaw menunjukkan bahwa komponen yang sering mengalami kerusakan adalah sprocket, busi, rantai, dan piston. Kerusakan dari komponen chainsaw dapat mempengaruhi besarnya waktu kerja tidak efektif sehingga akan membuat produktivitas yang dihasilkan menjadi kecil. Chainsaw merk Falcon tipe Pro 5800 memiliki produktivitas 2.45 m3/jam. Waktu efektif berkisar antara 0.2−0.4 jam dengan waktu rata-rata 0.3 jam dan waktu tidak efektif berkisar antara 0.18−0.24 jam dengan waktu rata-rata 0.21 jam.
Keyword: chainsaw, kerusakan, komponen, pengaruh, 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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