Judul: Analisis keprasan optimal per tanaman tebu untuk produksi gula studi kasus di PG Kremboong-Sidoarjo
Abstrak: Kebijaksanaan pemerintah untuk melestarikan swasembada gula merupakan tantangan berat bagi industri gula di ; Indonesia. Beberapa langkah pemikiran yang perlu dilakukan dalam upaya meningkatkan produksi gula adalah pemilihan varietas yang tepat, perbaikan faktor lingkungan dan memacu proses pertumbuhan tanaman tebu. Mengusahakan tanaman tebu sampai beberapa kali keprasan merupakan salah satu ciri budidaya teSu dilahan kering. Tujuar. penelitian ini dalah menentukan tingkat keprasan ymq paling optimal untuk di proses di pabrik gula serta menentukan biaya keprasan, biaya produksi dan hasil produksi yanq diperoleh.
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Judul: Analisis efisiensi proses produksi untuk peningkatan kinerja industri gula tebu (Cane Sugar) (Studi kasus di PG. Jatiluhur Majalengka, Jawa Barat)
Abstrak: Sugar is one of the most important commodities in Indonesia. Most of sugar manufacturing in Indonesia was owned or sun by Indonesian government. Sugar consumption rate cannot be fulfilled by local sugar manufacturer, that's why importing sugar became an option. The insignificant rate of increasing of sugar production every year make import rate is keep increasing Efficiency in sugar production process is one thing that need some attention. This time, most of sugar factory that owned by government are decreasing in productivity. PG Jatitujuh is sugar processing factory that processing cane into white crystal sugar (SHS) and one of sugar factory in Java that still runs well. Efficiency in sugar production process can be analyzed by using PG Jatitujuh production data. Analysis result shows that efficiency in sugar production process can be rendered, by optimalised increasing of imbibitions water. The optimum value of imbibitions water is 25-30 percent of processed cane. The decline of pol value in the amount of 0,01 percent is equal with 1,729 ton or equal with Rp. 8.297.865,- recovery sugar £rom bagasse. The decline of HK value in the amount of 0,01 percent is equal with 0,273 ton or equal with Rp. 1.3 12.524,- recovery sugar from molasses.
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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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