Judul: Analisis Pengendalian Mutu Produk Personal Care Serambi Botani Bermutu Tinggi di PT Adev Natural Indonesia, Bogor
Abstrak: Quality is a duty and a responsibility because it will affect the consumer’s personal safety, community’s safety and security in protecting producer’s market. The objective of this study is to review the quality control (QC) in the production process of Serambi’s Botani high quality personal care product in PT Adev Natural Indonesia, to analyze the factors that affected the quality of the product, and to analyze the QC in the product of that company which is being controlled or uncontrolled. The method that used in this study is cause and effect diagram and Pareto diagram, by interviewing the supervisor of operation production. Sample that used in this study is simple random sampling. The result of cause and effect diagram and Pareto diagram, soap product that produced by PT Adev Natural Indonesia still has a less good quality. For example, the cause of the quality of transparent soap is human factor cutting the soap; olive soap product is human factor measuring the thickness of the soap; rice soap product is environment factor storage; turmeric soap product is method factor soap transportation; propolis soap product is method factor heating.
Keyword: safety., quality product, Quality control

Judul: Teknik Pengendalian Persediaan Bahan Baku Sabun Transparan Di PT Adev Natural Indonesia, Bogor
Abstrak: Manajemen persediaan yang baik perlu diterapkan pada perusahaan, agar kegiatan produksi dapat berjalan lancar dan diperoleh biaya persediaan rendah. Tujuan penelitian ini, mengidentifikasi pengendalian persediaan, menganalisis pengendalian persediaan berdasarkan analisis ABC dan metode EOQ dan menganalisis perbandingan antara metode pengendalian persediaan perusahaan dengan metode EOQ. Informasi diperoleh dari data primer (observasi dan wawancara) dan sekunder (jurnal, skripsi, buku, internet dan dokumen perusahaan). Metode pada penelitian ini yaitu Analisis ABC berbasis kategori bahan baku dan metode Economic Order Quantity (EOQ). Hasil analisis ABC, terdapat tiga bahan baku kategori A. Metode EOQ menghasilkan pemesanan optimal per tahun 3 145 kg untuk TEA dan PG, 252 kg untuk fragrance dan penghematan biaya Rp980 118.5 untuk TEA dan PG dan Rp980 906 untuk Fragrance. Perusahaan dapat menerapkan analisis ABC untuk memberikan prioritas berbeda terhadap bahan baku dan dengan metode EOQ dapat meminimalkan total biaya persediaan.
Keyword: control technique, raw material, transparent soap

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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