Judul: Evaluasi Keberhasilan Tanaman Revegetasi Lahan Pasca Tambang Batu Bara Pada Blok M1w Pt Jorong Barutama Greston, Kalimantan Selatan
Abstrak: Pasca operasi penambangan perlu dilakukannya kegiatan reklamasi guna memulihkan dan memperbaiki fungsi lahan ke kondisi yang lebih baik dan produktif (P.60/Menhut-II/2009). Penelitian ini bertujuan untuk menganalisis status keberhasilan revegetasi dilihat dari daya tumbuh dan performa tanaman A. mangium di Blok M1W PT Jorong Barutama Greston, memberikan rekomendasi perbaikan lahan dan tanaman, dan mengidentifikasi penyebab ketidakberhasilan revegetasi. Hasil penelitian ini menunjukkan bahwa status keberhasilan revegetasi pada Blok M1W belum dikatakan berhasil karena dilihat dari rata-rata persentase tumbuh dan kesehatan tanaman masih di bawah 80% yaitu sebesar 59.38% dan 50.01%. Perbaikan yang dilakukan adalah melakukan pembenah tanah dan penyulaman menggunakan tanaman yang tahan terhadap tanah masam dan kandungan logam berat tinggi. Penyebab utama ketidakberhasilan revegetasi dikarenakan kondisi tempat tumbuh yang kurang mendukung pertumbuhan tanaman A. mangium dan kurangnya pemeliharaan tanaman. Hal tersebut menjadi penyebab menurunnya keberhasilan tanaman revegetasi. Selain itu, Standar Operasional Prosedur (SOP) kegiatan revegetasi perlu diperbaiki dengan penambahan mengenai kegiatan pemeliharaan tanaman kaitannya dengan pengendalian hama dan penyakit.
Keyword: A. mangium, evaluasi, lahan pasca tambang, revegetasi

Judul: Evaluasi Keberhasilan Tanaman Hasil Revegetasi di Lahan Pasca Tambang Batubara Site Lati PT Berau Coal Kalimantan Timur
Abstrak: Mining activities in the forest areas is done through the lend use of forest areas. The activities of mining must always be followed by reclamation and revegetation to restore the condition of damaged forest area as a result of mining efforts and forest areas can serve again in line with aimed. Revegetation is an effort to repair and restore the damaged vegetation by planting and maintenance activities on the grounds of forest areas former use. Evaluation needs to be done to find out the status of successful revegetation has been done by mining company. Purposes of this research are to assess the successful status of revegetation on post-mining land based on survival rate and plants performance of Acacia mangium on Block Q3 East Elevation 60 Lati Site of PT Berau Coal East Kalimantan. Observation also held to find out the causes of ineffective growth by result of soil analysis on post-mining land, and also to give recommendations of revegetation improvements. The result showed that the success of revegetation status on Block Q3 East Elevation 60 Lati Site is not successful based on survival rate and performance of planted plants. It is caused by the average values of growth and health plant percentage which lower than 80%. The average value of growth percentage is 79,31% and health plant percentage is 71,62%. The main factor of this condition is failure characteristics of soil revegetation which unsupport properly for the growth of plants. The level of soil acidity which appertain very acid soil can cause some important problems and it can be harmful to plants. Soil amendment and replanting vegetation should be done to improve revegetation on Block Q3 East Elevation 60 Lati Site PT Berau Coal East Kalimantan.
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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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