Judul: Penyimpanan Buah Salak Pondoh (Salacca edulis Reinw.) Menggunakan Kemasan Aktif Penyerap Etilen
Abstrak: Snake fruits is one of the agricultural commodities that have good prospects for development. Snake fruits is a local fruit comodity wich has some chracteristics : perishable and short shelf life. One of techniques to extend the shelf life of fruits is application of active packaging. Zeolit is one type of absorbent that can be used to inhibit growth rate of ethylene to extend the shelf life of fruit. In this study, snake fruits on plastic package is added by zeolit powder with a doses 5 and 10%. This doses of zeolit is calculated from initial weight of snake fruits. The result showed that zeolit doses 5% has better effect based on damaged level of snake fruts during storage compared to doses 10%. Quality changes during storage of snake fruits. This can be seen from the decrease in snake fruits chemical components. The value of total acids, Vitamin C, and total solid suspended levels desreased from the consecutive 0.67-0.58%, 2.20-1.58 mg/100 g, and 16-11ºBrix. Application packaging of zeolit on snake fruits with increased shelf life until 17 days with 50% level of damage. Organoleptic test result showed up to the 10 days of storage, generally snake fruits are acceptable to the panelists. But on the 20 day of storage, generally snake fruits can’t be acceptable by the panelists.
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Judul: Aplikasi Teknik Pengemasan dan Coating Khitosan untuk Memperpanjang Umur Simpan Buah Salak Pondoh (Salacca edulis Reinw)
Abstrak: During the storage, performance of snake fruit will be spoiled quickly. Due to enzimatic reaction, chemical reaction, and microorganism activity. The purpose of this research was to determine the shelf life of snake fruit with chitosan coating packed in PP and PE bag. Snake fruit was cleaned and sprayed with 0.7% Chitosan water solution. Water used in this research was distilled water, bottled drinking water and tap water. Coated snake fruit the was packed in PP and PE bag in normal and vacuum condition. Once packed, snake fruit was stored at 16-17°C then it was analysed in every of 2-5 days. The parameters observed was Vitamin C, total acid, percentage of weights loss, total dissolved solid, and panels preference. snake fruit that coated with chitosan distilled water packed in PP bag gave the longest shelf life ie. 31 days, performance of snake fruit with best treatment was vitamin C of 1.37 mg/100g, total acid content of 0.003%, the percentage of weights loss of 0.01%, TSS of 14 °brix and the percentage of spoiled of 43% and by panels preference test samples are preferred PPTB (PP bag normal with bottled drinking water solution).
Keyword: Snake Fruit, Chitosan, Coating

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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