Judul: Respon Pertumbuhan Bibit Sengon Buto pada Media Tailing PT Antam Pongkor dengan Penambahan Arang Tempurung Kelapa dan Bokashi Pupuk Kandang
Abstrak: The activity of mining could have a negative impacts for the environment if the waste it generates are not processed properly. The impact of negatives one of them is to produce the waste from gold mining activities and containing several nutrient (Tailing). Tailing is a mineral composite/heavy metal from gold mining activities. It has sandy texture and low nutrient elements. The one of ways for manage tailing is revegetation on tailing medium. Revegetation activities is one of vegetative technique that can be applied, one of them with adding of coconut shell charcoal and bokashi manure in sengon buto seedlings (Enterolobium cyclocarpum Griseb.). E. cyclocarpum is a fast growing species and one of species that have recommended for developing on land revegetation post mining with cheaper cost and also have good prospect and have high adaptability on various kinds of soil. The addition of coconut shell charcoal and bokashi manure expected to increase the quality of tailing as a growing medium in order to increase growth of E. cyclocarpum. Research conducted in the Silviculture greenhouse and forest of influence laboratory Faculty of Forestry IPB, with the location of tailing sampling conducted at PT Antam UBPE Pongkor and nutrient analysis conducted in Department of Soil Science and Land Resources laboratory Faculty of Agriculture IPB. This research uses an experimental method with a completely randomized design (CRD) factorial pattern, the first factor is coconut shell charcoal and the second factor is bokashi manure. Each treatment was repeated as many as 3 repetition. This research is finished during 3 months. The result of this research showed that the addition of coconut shell charcoal with dosage 10% and bokashi manure with dosage 60 g into tailing medium can increase value of the growth of E. cyclocarpum seedlings. and able to improve nutrient availability in the tailing medium. The addition of coconut shell charcoal and bokashi manure is the best treatment combination that able to improve nutrients availability at tailing.The activity of mining could have a negative impacts for the environment if the waste it generates are not processed properly. The impact of negatives one of them is to produce the waste from gold mining activities and containing several nutrient (Tailing). Tailing is a mineral composite/heavy metal from gold mining activities. It has sandy texture and low nutrient elements. The one of ways for manage tailing is revegetation on tailing medium. Revegetation activities is one of vegetative technique that can be applied, one of them with adding of coconut shell charcoal and bokashi manure in sengon buto seedlings (Enterolobium cyclocarpum Griseb.). E. cyclocarpum is a fast growing species and one of species that have recommended for developing on land revegetation post mining with cheaper cost and also have good prospect and have high adaptability on various kinds of soil. The addition of coconut shell charcoal and bokashi manure expected to increase the quality of tailing as a growing medium in order to increase growth of E. cyclocarpum. Research conducted in the Silviculture greenhouse and forest of influence laboratory Faculty of Forestry IPB, with the location of tailing sampling
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Judul: Aplikasi Arang Tempurung Kelapa dan Kotoran Sapi (Bokashi) Terhadap Pertumbuhan Semai Jabon pada Media Tanam Tailing Tambang Emas
Abstrak: Mining is one natural resources potential that can be used as a source of foreign exchange to national development. Activities in mining inflicts negative impact on the environment in form of the damaged environment, habitats animal and loss of the kinds of flora/fauna endemic. To prevent and reduce the destructive power worse, we need to sought various efforts control that leads to activity land rehabilitation one is modifying environment growing crops. One of them is giving coconut shells and bokashi on jabon to increase plant growth and productivity critical land after mine for a relatively cheap. This research used data of measurement of primary growth of jabon in the press cropping former gold mine (tailing). The method is applicable in the measurement of on the growth of high, diameter, the total weight of dry and NPA jabon on tailing with treatment granting coconut shells charcoal and bokashi in various doses for three months. Diverse analysis with the (Pr>f)<α (significant value<0.05) or influence the provision of charcoal and bokashi influential real on the growth of high In diameter, the total weight of dry and NPA of jabon on tailing, then test the continued to compare the middle value treatment. Test further used are a test duncan. Based on the results, it can be said the addition of charcoal and bokashi were able to repair the structure and texture of the medium, so it can improve the tailings deposits of nutrient elements for plants. Treatment A4B3 (granting of charcoal with a dose of 10% and bokashi with a dose of 60 grams) delivers the most flattering to increased growth of jabon on the gold mine tailings medium.
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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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