Judul: Utilization Miko-seedcookies to Increasing the Success Growth Merbau (Intsia bijuga) on Post-mining Land
Abstrak: Lahan terdegradasi dapat diatasi dengan cara revegetasi lahan menggunakan media tanam miko-seedcookies dan benih merbau. Tujuan penelitian ini adalah mengkaji pertumbuhan merbau dengan media miko-seedcookies. Rancangan percobaan pada penelitian ini menggunakan Rancangan Acak Kelompok (RAK) dengan satu faktor yaitu media miko-seedcookies dengan dua taraf yaitu diameter media 6 cm dan diameter media 7 cm. Parameter yang diamati adalah daya kecambah, tinggi, diameter, jumlah daun, intensitas dan luas serangan hama dan penyakit, serta kolonisasi FMA akar. Hasil penelitian menunjukkan bahwa perbedaan ukuran media tanam miko seedcookies tidak berpengaruh nyata terhadap semua parameter pertumbuhan merbau yang diamati dan persentase kolonisasi mikoriza. Hama dan penyakit yang ditemukan pada tanaman merbau adalah serangan belalang dan penyakit hawar daun, dengan intensitas dan luas serangan yang rendah. Oleh karena itu, penggunaan media miko-seedcookies dengan diameter 6 cm melalui teknik direct seeding dapat menjadi alternatif yang efektif dalam pertumbuhan merbau untuk revegetasi lahan pascatambang.
Keyword: direct seeding, Intsia bijuga, mikoriza, miko-seedcookies, pascatambang

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.
Keyword: