Judul: Pengendalian Mutu pada Proses Produksi di Tiga Usaha Kecil Menengah Tahu Kabupaten Bogor
Abstrak: Quality control (QC) is the measurement of product performance, comparing with the standards and specifications of the product, and make a corrections if there is a deviation. A product has the quality if in accordance with established quality standards or determined. The scope of the standard covers the quality of raw materials, production processes and finished products. The purpose of this study are : (1) Analyze the Quality Control on the production process in SME of Tahu Bambu, SME of Tahu Bandung Ashor and SME of Tahu Bandung; (2) Identify the factors which cause damage of Tofu in SME of Tahu Bambu, SME of Tahu Bandung Ashor and SME of Tahu Bandung; (3) Identify the most influence factor the quality of the SME of Tahu Bambu, SME of Tahu Bandung Ashor and SME of Tahu Bandung; (4) Assess the QC on the production process in the three units of SMEs Tofu controlled or not. The data that used in this study are secondary and primary data. Primary data obtained through direct observation and interviews to the SMEs by purposive sampling, while the secondary data obtained from the internet and literature such as books, journals and theses. Analysis tools used in this study are Pareto Diagram, Cause and Effect Diagram and Control Chart. Furthermore, Cause and Effect diagram is known that the factors that affect damage in three SMEs of Tofu i.e men, materials, machines and tools, methods and environment with the main cause of Tofu production process based on Pareto diagram analysis is unsuccessfull process of cutting. QC of the SME of Tahu Bambu and SME of Tahu Bandung were analyzed using p Control chart show controlled, but in SME of Tahu Bandung there is one (1) lack of control.
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Judul: Pengendalian Mutu Bahan Baku Produk PT. XYZ dengan Statistical Process Control.
Abstrak: Bahan baku berkontribusi besar terhadap mutu produk akhir. Karena itu, Divisi Quality Control PT. XYZ berupaya meningkatkan mutu bahan baku berupa refined bleached deodorized coconut oil (RBDCO) dan krimer non-dairy. Parameter mutu yang digunakan adalah bilangan peroksida untuk RBDCO, dan densitas kamba untuk krimer. Bilangan peroksida merupakan parameter status oksidatif minyak. Densitas kamba merupakan parameter penting dari bahan berbentuk serbuk, karena mempengaruhi volume bahan. Proses perbaikan mutu dilakukan menggunakan statistical process control (SPC). SPC digunakan untuk mengontrol dan mengurangi ragam dalam proses. Pengamatan dilakukan terhadap hasil analisis mutu kedua bahan baku, dan data hasil pengamatan dianalisis menggunakan grafik kendali. Grafik kendali menunjukkan bahwa mutu RBDCO telah terkendali, sedangkan mutu krimer belum terkendali. Ditemukan dua faktor utama yang menjadi fokus untuk perbaikan mutu krimer, yaitu RH laboratorium yang fluktuatif dan ketelitian analisis. Analisis dan perhitungan lebih lanjut menunjukkan bahwa RH laboratorium tidak mengalami fluktuasi yang signifikan. Nilai coefficient of variation (CV) dari analisis densitas kamba lebih besar dari 1.00 %, sehingga masih perlu dilakukan peningkatan ketelitian analisis. Kondisi kedua perangkat densitas yang digunakan berbeda, dan cara pengerjaan analisis dilakukan secara tidak konsisten oleh analis. Kedua hal tersebut dapat mempengaruhi ketelitian hasil analisis. Dibutuhkan studi lebih lanjut untuk mengetahui apakah rencana perbaikan telah sesuai.
Keyword: RBDCO, krimer non-dairy, bilangan peroksida, densitas kamba, statistical process control

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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