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: Upaya peningkatan kualitas kayu gergajian melalui pengendalian terhadap ukuran di PT.MAJORA INKAS Sukabumi
Abstrak: Berkaitan dengan adanya keterbatasan bahan baku kayu penurunan potensi produksi hutan serta mengingat tingginya prosentase produksi terutama untuk bahan baku dan guna mengimbangi pertumbuhan industri yang mengolah cipta mdik IPB Univers dan lebih lanjut hasil produksi penggergajian, maka dalam industri penggergajian perlu mengadakan optimalisasi bahan baku kayu yang digunakan dalam proses produksinya. Tujuan dari penelitian ini adalah untuk mengetahui terkendali atau tidaknya proses pembuatan sortimen dan menetapkan ukuran sasaran dari sortimen-sortimen yang diproduksi. Manfaat dari penelitian ini adalah dengan adanya usaha pengendalian terhadap ukuran diharapkan mampu meningkatkan kualitas sortimen kayu gergajian yang dihasilkan, sehingga mampu bersaing di pasaran dan kelangsungan permintaan konsumen dapat terjamin. Jenis sortimen yang diteliti adalah strips mutu I ukuran (5 x 12) cm, strips mutu II ukuran (4 x 10) cm dan reng ukuran (2,7 x 5) cm yang diproduksi PT. Majora Inkas. Metode pengendalian kualitas yang dilakukan adalah membuat peta pengendalian yang memetakan 30 titik hasil pengukuran rata-rata dimensi tebal dan lebar masing-masing sortimen. Sedangkan ukuran sasaran bahan baku (T) dari sortimen...
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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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