Judul: Ukuran Sasaran Sortimen Gergajian Jati (Tectona grandis) dan Analisis Pengendalian Mutu Penggergajian di Jepara
Abstrak: Target size determination of the sortimen thick is a method conducted to avoid wastage of raw materials and to overcome the deficiencies of the target size on manufacturing furniture. The diversity of the timber thick will impact the quality control of sawing, by using X and R control charts or not to the process will be seen. It helps improve the sawmill owner to improve, remain or reduce some process so that the quality of the resulted product to be better. The objective of this research is to determine the accuracy of the target size used by craftsmen in wood processing, and as well as the accuracy of sortimen has been sawed and to analyze the quality control of a sawmill. Target size determined by craftsmen in Jepara was almost close to the scientifically target size, but the problems that arised were the advantages and disadvantages of the target size when timber was being sawed into sortimen. Analysis of quality control indicated by X and R control charts Jepara’s sawmill showed that most of the sawing process was not controlled, this is due to several factors such as human resources, machines and environmental conditions.
Keyword: R control chart., target size, quality control, Jepara

Judul: Studi produktivitas mesin dan ketepatn ukuran sortimen di penggergajian mesin Madiun Perum Perhutani Unit II Jawa Timur
Abstrak: Untuk memperoleh produktivitas yang maksimal dari suatu industri penggergajian, diperlukan kelancaran dan keseimbangan dalam proses produksinya. Hal ini dapat dicapai antara lain dengan pengaturan dan penggunaan mesin yang sesuai, baik dari mesin utama (headrig) maupun mesin- mesin pembantunya. Keseimbangan mesin-mesin produksi dapat dilihat dari lancar tidaknya aliran produksi pada tiap-tiap mesin atau unit pengolahan produksi tertentu. Selanjutnya untuk mengetahui keseimbangan mesin-mesin produksi tersebut, dilakukan penelitian tentang produk- tivitas mesin utama dan mesin-mesin pembantunya. Selain itu pengawsan kualitas juga perlu dilaksanakan dalam kegiatan industri penggergajian. Penyimpangan kualitas tersebut dapat mengakibatkan pemborosan bahan baku, penurunan harga produk akhir dan peningkatan biaya produksi per satuan tertentu. Kualitas kayu gergajian dapat dilihat dari ketepatan ukuran, keteraturan bentuk dan penampilan dari kayu gergajian yang dihasilkan (Padli- nurjaji, 1979). Penelitian ini bertujuan untuk mengetahui keseimbangan produktivitas antar mesin dan ketepatan ukuran sortimen di Industri Penggergajian Mesin Madiun, Perum Perhutani Unit II Jawa Timur. Penelitian produktivitas mesin-mesin penggergajian dilakukan dengan menggunakan satu mesin headrig, satu mesin resaw, satu edger, dan satu trimmer. Sedangkan untuk ketepatan ukuran diambil dari jenis sortimen finish. Flooring ukuran 1,60 cm x 9,70 cm block ukuran 1,80 cm x 5,20 cm.....
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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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