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: Pemanfataan Media Tanam Miko-seedcookies pada Tanaman Nyamplung (Calophyllum inophyllum) di Lahan Pascatambang Kapur
Abstrak: Proses penambangan menyebabkan penurunan sifat-sifat tanah termasuk penurunan kesuburan tanah. Tanaman nyamplung memiliki kemampuan adaptasi yang baik terhadap kondisi lingkungan yang keras, termasuk lahan pascatambang kapur. Miko-seedcookies merupakan media tanam yang mengandung Fungi Mikoriza Arbuskula (FMA) yang berperan dalam meningkatkan penyerapan nutrisi dan ketersediaan air tanaman. Tujuan dari penelitian adalah 1) mengetahui pengaruh diameter miko-seedcookies terhadap perkecambahan dan pertumbuhan tanaman dan mendapatkan ukuran diameter media yang tepat, dan 2) menganalisis pengaruh miko-seedcookies yang dikombinasikan dengan teknik direct seeding dan peran FMA terhadap perkecambahan benih nyamplung di lahan pascatambang. Rancangan percobaan yang digunakan adalah Rancangan Acak Kelompok (RAK) dengan 2 perlakuan, yaitu diameter miko-seedcookies 5 cm dan 6 cm. Hasil penelitian menunjukkan bahwa perbedaan diameter miko-seedcookies tidak berpengaruh signifikan terhadap perkecambahan benih nyamplung dan pertumbuhan vegetatif tanaman nyamplung. Penanaman menggunakan media tanam miko-seedcookies yang mengandung mikoriza dengan teknik penanaman direct seeding mampu mempercepat perkecambahan benih nyamplung., The mining process causes a decrease in soil properties, including soil fertility. Nyamplung plants adapt well to harsh environmental conditions, including lime post-mining land. Miko-seedcookies are planting media containing Arbuscular Mycorrhizal Fungi (AMF), increasing nutrient absorption and water availability. The purposes of this study were 1) to determine the effect of the diameter of miko seedcookies on germination and plant growth and to obtain the right size of the diameter of the media, and 2) to analyze the effect of miko-seedcookies combined with direct seeding techniques and the role of AMF on nyamplung seed germination in post-mining land. The experimental design used was a Randomized Group Design (RBD) with 2 treatments, namely miko-seedcookies diameter of 5 cm and 6 cm. The results showed that the difference in diameter of miko-seedcookies did not significantly affect the germination of nyamplung seeds and the vegetative growth of nyamplung plants. Planting using miko-seedcookies planting media containing mycorrhiza with direct seeding technique can accelerate the germination of nyamplung seeds.
Keyword: AMF, Calophyllum inophyllum, Miko-seedcookies, Reclamation

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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