Judul: Pengkajian Penyimpanan Jeruk Besar (Citrus grandis (L.) Osbeck) Pengolahan Minimal Dengan Kemasan Atmosfir Termodifikasi
Abstrak: Komoditas hortikultura merupakan salah satu hasil pertanian yang memiliki nilai ekonomi tinggi. Pengembangan komoditas hortikultura cukup prospektip karena jumlah permintaan terhadap komoditas hortikultura cenderung meningkat dengan meningkatnya jumlah penduduk dan pendapatan per kapita Jeruk besar (Citrus grandrs (L.) Osbeck) merupakan salah satu jenis komoditas hortikultura yang banyak digernari oleh masyarakat, karena selain rasanya yang enak dan sedikit asam juga banyak mengandung vitamin dan mineral yang dibutuhkan oleh tubuh manusia Meningkatnya kesibukan kerja yang diiringi dengan peningkatan pendapatan, standar hidup dan t w a t pendidikan masyarakat menyebabkan walttu yang tersisa di lux jam kerja semakin sedikit. Konsekwensi ini membawa dampak terhadap permintaan konsurnen akan buah segar yang siap dikonsumsi, sehingga menyebabkan timbulnya kebutuhan &an pengetahurn dan tehik baru pang berkaitan dengan tehologi pengolahan minimal (minimally processed).
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Judul: Pengaruh Suhu dan Kemasan (Biodegradable, HDPE perforated) Terhadap Mutu Buah Jeruk Medan
Abstrak: Citrus is a perishable agricultural commodities so that it need decent and correct storage process. The objective of this research is to obtain the best combination of type of packaging between Biodegradable and perforated HDPE and the chosen temperature of storage room that is 6-8 0C, 25-260C dan 28-310C. Parameter that used were weight loss, water content, total sugar, total acid, levels of vitamin C, and organoleptic. Weight loss of citrus that packed by perforated HDPE and combination of 6-80C is the lowest, which is 1,48%. Of lowest decreased level of water content is obtained from perforated HDPE and 6-80C which is 89,95%. perforated HDPE and 6-80C combination is capable to hold the biosynthesis of ascorbic acid which has 102,08 mg/100g vitamin C at the end of research. Biodegradable is able to compete perforated HDPE at acceptance of organoleptic. But overall perforated HDPE is slightly better than biodegradable.
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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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