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: Kemasan Aktif Buah Salak Pondoh (Salacca edulis Reinw.) dengan Penyerap Gas Etilen dan Gas Karbondioksida
Abstrak: Snake fruit (Salacca edulis Reinw.) is one of the leading agricultural commodities in Indonesia which is currently widely consumed by the public, unfortunately fruits do not have a long shelf life after harvest. This study was purposed to obtain a combination of absorbing ethylene gases and CO2 gases produced from the respiration of fruits in order to extend shelf life. There are two combinations of absorbent material used, the chalk with zeolite and lime with activated charcoal. Zeolites and activated charcoal has a role to absorb the ethylene gas produced during the storage of snake fruit, while the role of lime to absorb CO2 gas produced from the salak respiration during storage. Concentration of each absorber used are: limestone (2.5%), zeolite (2.5%) and activated charcoal (1.5%). Type of plastic used to package the snake fruit is a type of plastic PP and PET with a thickness of 0.8 μm plastic. There are two packaging techniques that applied, with vacuum and normal. Temperature used in the fruits during their storage is 16-20° C with a humidity of 99%. The results of observations, a combination of absorbent materials which can increase the shelf life of salak and produces the smallest percentage of damage is a combination of lime with a zeolite absorbent material in plastic PETnormal. The combination was able to increase the shelf life up to 26 days.
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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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