Judul: Cajeput Seedlings Endurances to Various Media  Contaminated by Acid Mine Drainage
Abstrak: Kayu putih (Melaleuca cajuputi) telah digunakan sebagai tanaman revegetasi lahan pascatambang. Pemberian bahan organik pada lahan pascatambang dapat memperbaiki kondisi fisik, kimia, dan biologi tanah. Kondisi tanah yang baik akan meningkatkan pertumbuhan dan ketahanan kayu putih pada kondisi tercemar air asam tambang. Penelitian ini bertujuan menganalisis campuran tanah dan kompos serta campuran tanah dan arang sekam terhadap ketahanan dan pertumbuhan bibit kayu putih yang tercemar air asam tambang serta menganalisis pengaruh tingkat konsentrasi cemaran air asam tambang terhadap ketahanan bibit kayu putih pada berbagai media tanam. Penelitian ini menggunakan Rancangan Acak Lengkap Faktorial dengan dua faktor yang terdiri dari konsentrasi air asam tambang dan jenis media tanam. Hasil penelitian ini menunjukkan bahwa tidak ada pengaruh interaksi antar faktor dan faktor tunggal konsentrasi air asam tambang terhadap persentase hidup, pertumbuhan tinggi, diameter, dan pertambahan jumlah daun, berat basah total, berat kering total, kadar air, dan panjang akar sedangkan media tanam yang digunakan memberikan pengaruh nyata terhadap persentase hidup, pertumbuhan tinggi, diameter, dan pertambahan jumlah daun., Cajeput (Melaleuca cajuputi) is widely used as a post-mining revegetation plant. The addition of organic matter to post-mining land can improve the physical, chemical, and biological conditions of the soil that lead on to increasing growth and endurance of cajeput in polluted land by acid mine drainage. This study aims to analyze the effect of compost mixture media and roasted husk mixture media to endurance and growth of cajeput seedling and also to analyze the effect of acid mine drainage concentration on the endurances of cajeput seedling on various media. This study used a completely randomized design with two factors consisting of acid mine drainage concentration and type of media. The results of this study indicate that the concentration of acid mine drainage has no significant effect on the growth of height, diameter, and number of leaves, also on total wet weight, total dry weight, moisture content, and root length while the type of media used has a significant effect on growth in height, diameter, and the number of leaves.
Keyword: acid mine drainage, compost, Melaleuca cajuputi, roasted husk

Judul: The Effect of MycoSilvi and Soil Ameliorant on The Growth of seedling Kayu Kuku (Pericopsis mooniana) on Silica Sand Post-Mining Land
Abstrak: Kegiatan pertambangan dapat menurunkan kesuburan tanah yang dicirikan oleh kandungan bahan organik yang rendah dan pH tanah yang masam, sehingga dapat menghambat kegiatan revegetasi. Kayu kuku merupakan salah satu jenis tanaman yang banyak digunakan untuk merevegetasi lahan pascatambang. Tujuan penelitian ini adalah menganalisa respon pertumbuhan semai kayu kuku (Pericopsis mooniana) dengan perlakuan MycoSilvi dan amelioran tanah pada media pascatambang pasir silika. Rancangan percobaan yang digunakan pada penelitian ini yaitu Rancangan Acak Lengkap (RAL) dengan tiga faktor perlakuan (MycoSilvi, arang tempurung kelapa dan pupuk kandang kambing). Hasil penelitian menunjukkan kombinasi 5 g MycoSilvi, 45 g arang tempurung kelapa dan 45 g pupuk kandang kambing merupakan kombinasi terbaik yang menghasilkan total laju pertumbuhan tinggi dan kandungan klorofil paling besar dibandingkan perlakuan lainnya., Mining activities can reduce soil fertility which is characterized by low organic matter content and acidic soil pH, which can inhibit revegetation activities. Kayu Kuku is one type of plant that is widely used for revegetating post-mining land. The purpose of this study was to analyze the growth response of kayu kuku (Pericopsis mooniana) seedlings with MycoSilvi treatment and soil ameliorant on silica sand post-mining soil. The experimental design used in this study was a Completely Randomized Design (CRD) with three treatment factors (MycoSilvi, coconut shell charcoal, and goat manure). The results showed a combination of 5 g MycoSilvi, 45 g coconut shell charcoal, and 45 g goat manure was the best combination that produced a high total growth rate and the greatest chlorophyll content compared to other treatments.
Keyword: Coconut shell charcoal, Goat manure, MycoSilvi, Pericopsis mooniana, post mine

Judul: Grup dan Homomorfisma Grup pada Rubik Revenge
Abstrak: Rubik cube is a kind of puzzle game. A player must arrange rubik sides, which have been disordered, back to the position where every side has the same colour. This paper does not focus on the settlement solution, but instead on proving the existence of a group homomorphism between rubik movement group and S96 symmetric permutation group in rubik revenge. Firstly, it has been proved that rubik movement set is a group. Then, it also has been proved that the M set, which contains numeric labels of 1 until 96 in cubinos sides, is S96 symmetric permutation group.
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