Judul: Planting of Sengon Buto (Enterolobium cyclocarpum Griseb.) in  Former Limestone Mine Land using Miko-Seedcookies Media
Abstrak: Kegiatan pertambangan menghasilkan mineral dan bahan lain yang digunakan untuk memenuhi kebutuhan manusia. Proses pengambilan bahan tambang memberikan dampak terhadap perubahan lingkungan, antara lain: hilangnya tutupan vegetasi, perubahan bentang lahan, dan kualitas tanah yang menurun. Salah satu contoh kegiatan tambang yaitu pertambangan batu kapur yang digunakan untuk memproduksi semen. Pertambangan batu kapur mengakibatkan hilangnya vegetasi yang berada di atas permukaan tanah dan juga mengubah struktur dan tekstur tanah. Perlu adanya kegiatan reklamasi dan revegetasi untuk memulihkan kembali kondisi lingkungan. Dalam kegiatan revegetasi dilakukan menggunakan tanaman sengon buto (Enterolobium cyclocarpum Griseb.) dengan metode penanaman benih langsung pada media pembawa Miko-seedcookies. Tujuan penelitian ini yaitu mengetahui pengaruh ukuran diameter media Miko-seedcookies(MSC) terhadap daya kecambah benih kemampuan hidup, pertumbuhan, dan kolonisasi fungi mikoriza arbuskula (FMA) tanaman sengon buto pada lahan bekas tambang batu kapur. Penelitian dilakukan dengan menggunakan rancangan percobaan Rancangan Acak Kelompok Lengkap (RAKL) dengan jarak tanam 2 x 1 m. Hasil penelitian menunjukkan perlakuan ukuran diameter media Miko-seedcookies memberikan pengaruh nyata terhadap pertumbuhan tinggi dan kolonisasi FMA, pertumbuhan tinggi dan kolonisasi FMA paling tinggi pada ukuran Miko seedcookies D3 (6 cm).
Keyword: enterolobium, mine reclamation, seedcookies, mycorrhiza, sengon

Judul: The Effect of Fly Ash Bottom Ash in MikoSeedCookies on the Growth of Sengon Buto and Sengon on Post-Coal Mining Land
Abstrak: Kegiatan penambangan batubara menggunakan metode sistem tambang terbuka yang menyebabkan penurunan kualitas kesuburan tanah. Lahan yang telah dilakukan kegiatan penambangan perlu dilakukan kegiatan revegetasi. Jenis yang dipilih untuk kegiatan revegetasi yaitu sengon buto (Enterolobium cyclocarpum (Jacq.) Griseb.) dan sengon (Falcataria moluccana (Miq.) Barneby & Grimes) karena mudah beradaptasi. Penanaman benih secara langsung (direct seeding) menjadi solusi alternatif untuk mengurangi biaya kegiatan revegetasi dengan bantuan media tanam campuran Miko-SeedCookies dan FABA. Penelitian ini bertujuan menganalisis pertumbuhan benih sengon buto dan sengon menggunakan media tanam campuran Miko-SeedCookies dan FABA, serta menganalisis kolonisasi mikoriza pada tanaman sengon buto dan sengon. Penelitian ini menggunakan Rancangan Acak Kelompok (RAK) terdiri empat perlakuan yaitu B0 (MSC + FABA 0%), B1 (MSC + FABA 10%), B2 (MSC + FABA 20%), dan B3 (MSC + FABA 30%) dan masing-masing 3 ulangan. Hasil penelitian menunjukkan perlakuan pada jenis sengon buto tidak memberikan pengaruh nyata pada setiap parameternya, tetapi pada jenis sengon parameter pertumbuhan tinggi dan diameter dipengaruhi secara nyata oleh perlakuan B1 akibat dosis FABA yang mempengaruhinya. Kolonisasi mikoriza pada jenis sengon buto berada pada rentang 9-24%, sedangkan pada sengon 0-2 yang tergolong kelas rendah-sangat rendah., Coal mining activities use an open mining system method which causes a decrease in quality of soil fertility. Mining land activities have been carried out needs to be revegetated. The types chosen for revegetation are sengon buto (Enterolobium cyclocarpum (Jacq.) Griseb.) and sengon (Falcataria moluccana (Miq.) Barneby & Grimes) because they are easy to adapt. Direct seeding is an alternative solution to reduce the costs of revegetation activities with help of a mixture of Miko-SeedCookies and FABA planting media. This research aims to analyze the growth of sengon buto and sengon seeds using a mixture of Miko-SeedCookies and FABA planting media, as well as analyzing mycorrhizal colonization on sengon buto and sengon. This research used a Randomized Block Design consisting of four treatments, B0 (MSC + FABA 0%), B1 (MSC + FABA 10%), B2 (MSC + FABA 20%), and B3 (MSC + FABA 30%) with 3 repetitions. The results of the research showed that the treatment on the sengon buto species did not have a real influence on any parameters, but on sengon species, the height and diameter growth parameters are significantly influenced by B1 treatment to FABA dose which affect them. Mycorrhizal colonization in sengon buto species is in the range of 9-24%, while sengon 0- 2% is classified as low-very low.
Keyword: Bottom Ash, Fly Ash, kolonisasi, Miko-SeedCookies, sengon, colonization, Bottom Ash, Fly Ash, Miko-SeedCookies, sengon

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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