Judul: Pemanfaatan Lahan Bekas Tambang pada Sektor Peternakan : Sebuah Analisis Biaya Manfaat (Studi Kasus Program Peternakan Sapi Terpadu PT KPC Kutai Timur)
Abstrak: Indonesia is a rich of coal resources country. It makes the mining companies grow rapidly in Indonesia. Currently the Ministry of Energy and Mineral Resources (ESDM) records that 5940 the mining permit (IUP) are non clean and clear, and 4624 the mining permit are clean and clear. The existence of the mining business brings many economic benefits, but, on the other hand, it brings the environmental damage, especially the soil where the mining activities do. Therefore, each mining company in Indonesia has been charged reclamation obilgation in ex-mining land which it is under law and ministerial regulation. After reclamation, a lot of things can do in ex-mining land, such as using exmining land in forestry, agriculture, fisheries, and livestock farming. PT KPC is one of the largest coal mining companies in Indonesia that is operating in Kutai Timur. In the context of reclamation of ex-minig land, PT KPC tries to use its exmining land in livestock farming by The Integrated Cow Farming Program (PESAT). This program is included in the company's CSR program and has been running since late 2009. PESAT is a integrated program between the breeding activities of Balinese caw and the local breeders training and internship program. Since the implementaion of this program, a lot of progress perceived by both the company and the community, thus, it is necessary to do research on the cost benefit analysis of it. The purposes of this study are: (1) to analyze the model or concept of PESAT, (2) to estimate the costs and benefits of the program, (3) to formulate stakeholder relations in the program, and (4) to identify the characteristics and perceptions of PESAT participants. The method used in this study consisted of descriptive analysis, cost benefit analysis, sensitivity analysis, stakeholder analysis and perceptual analysis. This study shows that PESAT’s concept which is done by PT KPC is the integrated program. It is consisted Balinese cow breeding and its byproducts, cultivation Dairy Cattle and their byproducts, vegetables and farm training Balinese Cows breeders in the form of an internship for 6 months. PESAT program was run so far has many benefits for the company and the community, as a result of the marketing of livestock and processed products, such as beef, milk, yogurt, ice milk and ice cream. Another benefit are the result of product marketing vegetables, compost fertilizer, an educational tourist attractions, a field laboratory STIPER Campus in East Kutai, a place or meeting room, a company guest lodge, the fieldwork practice and research, enhance the company's reputation and increase science breeders. Some of the benefites can be quantified, and some can 5 not .The costs incurred by the company towards PESAT program consists of investment costs and annual operating costs. PESAT program feasibility analysis is conducted based on several scenarios. The first scenario is the residual value of fixed assets is not taken into account, the obtained value of NPV about IDR-451 256 201, net B/C at 1, gross B/C at 1, and IRR at 5%. The second scenario is the residual value of fixed assets taken into account,
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Judul: Analysis of the Total Economic Value of Revegetation of Ex-Mining Land of PT Indocement Tunggal Prakarsa Tbk Citeureup Unit
Abstrak: PT Indocement Tunggal Prakarsa Tbk merupakan industri semen di Indonesia yang melakukan sendiri penambangan bahan utama semen yaitu batu kapur dan tanah liat. Indocement telah melakukan kegiatan revegetasi pada lahan bekas tambang sejak tahun 2004. Manfaat lingkungan seringkali dinilai secara rendah sehingga berpotensi menimbulkan eksploitasi sumber daya alam yang berlebih. Tujuan penelitian ini adalah (1) mengestimasi serapan karbon dari area revegetasi lahan bekas tambang Indocement Unit Citeureup sebagai salah satu nilai keberhasilan area revegetasi, (2) menganalisis nilai ekonomi total pemanfaatan lahan bekas tambang untuk revegetasi, (3) merumuskan strategi kebijakan pengembangan area revegetasi lahan bekas tambang Indocement Unit Citeureup agar berkelanjutan. Fokus pada penelitian ini adalah area revegetasi Quarry D dengan luas 67,94 ha dan Quarry Hambalang dengan luas 28,15 ha. Hasil penelitian ini menunjukkan bahwa area revegetasi Indocement Unit Citeureup memiliki nilai ekonomi total Rp2.759.217.662.803 dengan potensi nilai ekonomi terbesar dari nilai guna tidak langsung., PT Indocement Tunggal Prakarsa Tbk is a cement industry in Indonesia that mines the main cement ingredients, namely limestone and clay. Indocement has carried out revegetation activities on ex-mining land since 2004. The environmental benefits are still often undervalued, which has the potential to lead to over-exploitation of natural resources. The objectives of this research are (1) to estimate carbon uptake from the revegetation area of ex-mining land in the Citeureup Unit of Indocement as one of the success values of the revegetation area, (2) to analyze the total economic value of using ex-mining land for revegetation, (3) formulate a policy strategy for developing the area revegetation of ex-mining land in the Indocement Citeureup Unit so that it is sustainable. The focus of this research is the revegetation area of Quarry D with an area of 67.94 ha and Quarry Hambalang with an area of 28.15 ha. The results of this study indicate that the Indocement Unit Citeureup revegetation area has a total economic value of IDR2,759,217,662,803 with the greatest potential economic value from indirect use value.
Keyword: biomassa, jasa lingkungan, reklamasi, serapan karbon, biomass, reclamation, willingness to pay, WTP, carbon uptake, environmental service

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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