Judul: Arahan strategi kebijakan reklamasi lahan pasca penambangan nikel pada lahan konsesi PT. Aneka Tambang Tbk. unit bisnis pertambangan nikel daerah operasi Maluku Utara Kabupaten Halmahera Timur Provinsi Maluku Utara
Abstrak: Dunia pertambangan sering diangap sebagai perusakan dam dan lingkungan, oleh karena itu negara dengan cadangan tambang yang cukup besar seperti Indonesia sudah harus memiliki pedoman standar lingkungan pertambangan. Provinsi Maluku Utara dikenal dengan daerah penghasil nikel. Unit Bisnis Pertambangan Nikel (UBPN) Daerah Operasi Maluku Utara adalah salah satu unit produksi PT. Aneka Tambang Tbk, yang pekerjaan penambangannya dilaksanakan 90% oleh kontraktor, sedangkan pengawasannya di bawah UBPN Maluku Utara. Tujuan penelitian ini adalah : Mengetahui kondisi ekologi, ekonomi, sosial dan kelembagaan pada daerah reklamasi lahan pasca penambangan dan menentukan arahan strategi kebijakan reklamasi lahan pasca penambangan nikel. Waktu penelitian dilaksanakan selama tiga bulan di lapangan pada bulan Desember 2006-September 2007.
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Judul: Dampak Pertambangan Nikel Terhadap Sosial – Ekonomi – Ekologi Masyarakat di Kecamatan Wasile Kabupaten Halmahera Timur
Abstrak: Wasile, one of the East Halmahera district contained nickel mining, and a great influence on the social, economic and environmental life of the community. Thus this study refers to the theory and previous studies, researchers tried to base it on a frame of mind that the Sustainability of social, economic society strongly influenced by; carrying capacity of the environment, natural resources, human resources, facilities and infrastructure, the financial, social and cultural rights. The purpose of this study was to analyze the impact of nickel mining on socio - economic - ecological communities in the sub District Wasile, East Halmahera. The research center is a sample of 2 (two) villages that are near and far away from the mining of nickel, the village of Batu Raja (near the village) and Subaim Desa (village far). By sampling in this study consisted of local people to be around and who are far away from the nickel mining company, yet to feel the impact of the mining question. The number of samples taken from the respondents ie 80 people consisting of 40 people from each village who are near and far away from the mine site consisting of local people actively working. Direct Observation Field Interviews In-depth interviews using questionnaires Change in Productivity analysis or can be referred to as the Productivity method, Chi-square analysis, and SWOT. Based on the results of mining in the region contribute to the local economy are significant in terms of: (a) regional Revenue, (b) Expansion of employment opportunities, (c) Reduction of unemployment in the area. But the social and ecological impact is not profitable to society. The formulation of the proposed policy are: (1) there was no issuance of new licenses. The hold and maintain the position of the SWOT analysis, meaning that the company's existing nickel can be allowed to continue operations, but the company must pay attention to social and ecological impacts that adversely affect local communities and the environment. Suggestions policies proposed by this research is to increase CSR schemes to improve the adverse effects of mining companies operating in the fields of social and ecological.
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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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