Judul: Penggunaan Bio Soil Booster untuk Perbaikan Kualitas Tanah pada Lahan Bekas Tambang Batubara
Abstrak: Revegetation activities at the former mines often experience many obstacles such as the low soil pH, soil compaction, low nutrient content, and contain toxic materials on the ground. Improvement of soil quality needs to be done to support the success of reclamation. Improvement of soil quality can be done by adding bio soil booster on the ground soil. This research aims to know the influence of bio soil booster on granting the land ex coal mining with sorgum (Sorghum bicolor Linn.) as an indicator of soil quality. Bio soil booster used consisting of four concentration levels, namely concentration of 0%, concentration of 0.4%, concentration of 0.2%, concentration of 0.1%. Planting media consisting of six soil types, the land top soil and five a type of soil land a former coal mines derived from different location in PT. Jorong Barutama Greston tbk. Responses observed are growth was high, the long roots, the performances of roots and leaves. The use of bio soil booster in a planting media can increased an average of a height and length „s root S. bicolor and to increase its performance root and leaves, this indicates an increase in the quality of the soil in a planting media. The use of bio soil booster effective the first concentration 0.4% and a 0.2%.
Keyword: Bogor Agricultural University (IPB), soil quality, S. bicolor, bio soil booster

Judul: Quality Analysis of River Water Around and Soil in the Mining Area of PT Berau Coal Binungan Site, East Kalimantan Province
Abstrak: Salah satu hal terpenting dalam aktivitas penambangan batubara dengan sistem tambang terbuka adalah bagaimana melakukan reklamasi lahan dan mengembalikan agar kelestarian lingkungan tetap terjaga. Reklamasi lahan pasca tambang merupakan bagian dari perencanaan dan pelaksanaan kegiatan penambangan untuk memastikan agar upaya perbaikan lahan-lahan yang terganggu oleh kegiatan pertambangan dapat dilaksanakan secara efektif dan efisien dengan mempertimbangkan karakteristik kondisi fisik, kimia, dan biologi tanah. Sampai saat ini reklamasi yang telah dilakukan diduga belum ada yang berpihak pada pembangunan kawasan pasca tambang batubara yang berkelanjutan dengan menganut prinsip memanfaatkan, melindungi dan melestarikan lingkungan. Sementara itu, pelaksanaan reklamasi yang dilakukan sampai saat ini sifatnya sekedar memenuhi tuntutan prosedur yaitu hanya menjadikan reklamasi sebagai bagian dari persyaratan pelaksanaan pertambangan batubara yang kebanyakan belum memadai. Kegiatan reklamasi ini selain ditunjukan untuk memperbaiki sifat-sifat tanah, diharapkan juga akan memperbaiki kualitas air permukaan di sekitar areal reklamasi. Oleh karena itu perlu dilakukan penelitian untuk mengetahui kondisi air dan tanah di sekitar areal daerah tersebut. Dengan penelitian ini, diharapkan menjadi acuan dalam pelaksanaan reklamasi yang berkelanjutan., Coal mining activities without reclamation will lead to environmental degradation such as change of freshwater and soil qualities. Reclamation of post mining land is part of the planning and implementation of mining activities to ensure that repairing of lands affected by mining activities can be conducted effectively and efficiently by improving the post mined soil conditions. This research was aimed to analyze the qualities of river water around and soil in the mining area of PT Berau Coal Binungan Site. Samples of river water were taken as many as 10 locations, whereas soil samples were taken from soils of land after 0, 3, 6, and 9 years of reclamation and forest soil. The results showed that some of the parameters of water such as temperature, pH, DO, Fe, Mn, oils and fats, were below the grade I Quality Standard of Government Regulation No. 82/ 2001. However, COD was above Grade III, while BOD was above grade IV of the Quality Standard. These indicates that all the water sample were not qualified as standart drinking water (grade I). Results of soil analysis indicated that physical, chemical and biological of soil properties varied both due to the increase in reclamation age and the heterogeneous nature of the soil materials. Properties including BD, infiltration, aggregate stability, organic-C, and biological properties were improved with increasing the age of reclamation approaching the properties of forest soil. Other properties including pH, CEC, exchangeable bases, base saturation, available P, available micro elements, and total S were varied due also to the heterogeneous nature of the soil material.
Keyword: Coal mining, Water quality, Soil quality

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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