Judul: Mempelajari Aspek Pengendalian Mutu pada Proses Pemurnian Minyak Sawit (Elaeis guinensis Jacq) di PT. Eka Dura Indonesia (Astra Agro Niaga) Medan-Sumatera Utara
Abstrak: PT. Eka Dura Indonesia marupakan sebuah perusahaan penanaman Modal dalam Negeri (PMDN) yang mengolah Crude Palm Oil (CPO) menjadi produk olein dan stearin. Proses pengolahan CPO ini terdiri dari dua proses utama yaitu rafinasi dan fraksinasi. Proses rafinasi adalah pemurnian CPO dari zat-zat yang tidak diiginkan seperti getah atau gum, asam lemak bebas dan rasa serta bau yang tidak enak, proses eafinasi di PT. Eka Dura Indonesia menggunakan proses rafinasi fisik (physical refining), sedangkan proses fraksinasi atau pemisahanfraksi cair dan fraksi padat menggunakan proses fraksinasi (dry fractination).
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Judul: Analisis Pengendalian Mutu Minyak Kelapa Sawit pada PTPN VI Jambi
Abstrak: Development of national palm oil industry is very prospective. One of the palm oil companies that have a high contribution for Indonesia is PTPN VI. The purpose of this study to know the production process, the factors that influence the quality and implementation of quality control analyzes conducted by PTPN VI on the production process of palm kernel oil. This study uses primary data collected from interviews and secondary data from company data and analysis tools with a causal diagram and control charts. Based on the analysis, production quality control (QC) is done by the company is QC of raw materials, QC of production processes and QC of proceeds production. Production of palm kernel oil and palm oil are produced in the factory, with a series of processes, the receipt of raw materials, boiling, thresing, compression, separation of oil from sludge and citations core. This process will affect the quality factors, namely palm oil free fatty acids (FFA), moisture content (MC) and levels of impurities (LOI), while palm kernel is the moisture content (MC) and levels of impurities (LOI). In the cause effect diagram, the high and low value of FFA, MC and LOI is determined by several factors, namely fresh fruit bunches (FFB), labor, machinery and equipment, methods and environment. In control charts, process oil and palm kernel production still uncontrolled variation caused by many causes.
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Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model