Judul: Analisis Kelayakan Pengelolaan Penyediaan Kompos untuk Pembangunan Hutan Kota Jakarta (Studi Kasus di Kebun Pengomposan Karinda, Lebak Bulus, Jakarta Selatan)
Abstrak: Srengseng Urban Forest (SUF) is one of the urban forest in Jakarta. SUF’s main problem is the amount of waste that is deliberately thrown away by residents around the SUF area . It takes a basic understanding of proper waste management. Therefore, a case study was conducted on the management of turning waste into compost at Karinda Garden, South Jakarta. As well to know the added value and feasibility of composting, so that it can be implemented by SUF as a strategy in providing compost in future times to come and it can be used as basic education to the residents around SUF about how to manage the organic waste. The added value through waste management of Rp 542.35/kg or by 75.43%. Karinda Garden composting is considered feasible in aspects of market, management, technique, social, and financial. Based on financial analysis, the NPV obtained from operations amounted up to Rp 33 492 850 with BCR of 1.12 and IRR of 45 %. SUF garden waste utilization can produce 12 474 kg of compost in a year. This fertilizer can be used to provide compost in the future for greening the SUF area.
Keyword: Bogor Agricultural University (IPB), urban forest, feasibility, compost, added value

Judul: Prospek Pengelolaan Sampah Terpadu Berbasis Masyarakat Sebagai Upaya Konservasi Sumberdaya Hayati (Studi Kasus Kecamatan Ciracas & Jatinegara) Di Jakarta Timur.
Abstrak: The rapid increase in population growth rate of Indonesia brings benefits to growth and development of the city became the center of economic activity, industrial, social and cultural consequences of the increasing social costs. One of the impacts that occur because of increasing population and consumption patterns of society is the increasing amount of waste that is a byproduct of human activity. Trash does not always lead to adverse impacts to humans, even garbage can be used as a valuable economic commodity. Recycling activities both through the reuse, recycling and composting by the community is beneficial because it can suppress the accumulation of garbage in the environment, and also economically beneficial to society itself. Besides the production of compost from organic waste derived from natural resources to be useful in restoring the natural nutrients are broken down can be used in aquaculture, especially in forest nursery plants, especially forestry and agricultural crops in general. Analysis of the participation rate in its waste management used Spearman Correlation Test. Financial feasibility analysis of Elegant Quality compost plant can be seen from the criteria of NPV (Net Present Value), Net B/C (Net Benefit/Cost), and IRR (Internal Rate of Return). Value of economic benefits by the city garbage scavengers obtained from the estimated volume of waste dauran materials obtained by scavengers multiplied by the value of selling. Primary data were collected through interviews using questionnaires and field observations. While secondary data obtained from literature studies that collect data that has become the archives for the manager, through the tracing information from the related institutions .. Community participation in district level Ciracas in waste management were categorized as high with the percentage (71.67%), this suggests a positive outlook, because the future of education levels tend to increase recycling and composting activities provide economic benefits and have a good opportunity to developed. The economic advantages of recycling activities on average Rp 892,259.41 per ton of inorganic waste. Business dauran waste materials will provide the average income of Rp 31229.08 / day. Composting business has a value of B/C 5, while the value of business acquired IRR of 44.47% lovely compost, compost operations conducted by the present value of benefits to be implemented because it provides an additional benefit or profit of Rp 24,480,229.42. The majority of landfill waste in East Jakarta came from residential 5300 m³/day (78.91%) and the market with a volume of 580 m³/day (8.64%). Amount of landfill waste is served that is equal to 83.43%, the remaining 16.57% of waste is not transported. Handling waste in the form of recycling (4-3R) in East Jakarta at 354 m³/day will be reduced at least 5.27% per day from the garbage of 6716 m³/day. While handling in the form of composting for 46 m³/day will reduce at least 0.68% per day from the garbage of 6716 m³/day. Citizen participation and scavengers in waste reuse of waste will reduce operational costs and can reduce the burden of cleaning service in transporting waste from TPS to TPA. And use of waste as compost made by the community have ability to
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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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