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.
Keyword: 

Judul: Pertumbuhan Semai Jabon (Anthocephalus cadamba) pada Media Bekas Tambang Pasir dengan Penambahan Sub Soil dan Arang Tempurung Kelapa
Abstrak: The effect of sand mining are environmental degredation and reduction of soil quality (physically, chemistry, or biological). The land of ex-sand mining could be marginal land and causes the revegetation barrier. Soil amendment is a necessary phase for this problem i.e. additional of sub soil and charchoal of coconut shell on the soil. The species selection also determine for revegetation result. Jabon (Anthocephalus cadamba) is an pioneer, adaptive and fast growing species. The aim of this reasearch are to analyze the effect of sub soil and charcoal of coconut shell increment to the growth of jabon seedling on ex-sand mining soil and to find out the optimum dose of sub soil and charcoal of coconut shell increment. The result of this research showed that sub soil and charcoal of coconut shell increment on ex-sand mining soil extend positive influence. The combination 500 g sub soil and 20 g charcoal of coconut shell gave the best growth for jabon seddling on ex-sand mining soil.
Keyword: sub soil, sand mining, coconut shell, charcoal, Anthocephalus cadamba

Judul: Kajian frieze groups untuk klasifikasi dan konstruksi desain berdasarkan simetri pada pola
Abstrak: Frieze groups adalah konsep matematika untuk mengklasifikasikan desain pada dua dimensi permukaan yang berulang-ulang dalam satu arah berdasarkan simetri pada pola. Frieze groups merupakan grup yang mempertahankan bentuk pola. Pergerakan bentuk pola terdiri dari translasi, refleksi dan rotasi 180o. Tujuan dari karya ilmiah ini adalah mengkaji sifat Frieze group, mengkaji penggunaan Frieze group dalam mengklasifikasikan simetri pada pola dan mengkonstruksi pola dengan menggunakan software tesselmania. Hasil yang telah diperoleh, bahwa jenis Frieze groups merupakan subgroup dari grup pergerakan pola. Selain itu dapat dilihat dari sifat isomorfik berbagai jenis Frieze groups. Untuk mengkonstruksi sebuah bentuk pola dapat menggunakan salah satu software untuk membentuk sebuah pola bidang datar (dua dimensi) yaitu tesselmania.
Keyword: Frieze groups, Simetri, Pola