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: Value Added Analysis and Sustainable Community-Based Waste Management Strategies (Case Study: Akademi Kompos  Jakarta)
Abstrak: Sebanyak 90,8% sampah warga DKI Jakarta yang tidak terkelola, mendorong pemerintah mewajibkan masyarakat untuk mengelola sampah rumah tangga. Akademi Kompos Jakarta (Akkom) merupakan salah satu kelompok pengelolaa n sampah dengan berbagai program unggulan. Tujuan penelitian ini adalah menganalisis persepsi masyarakat, menganalisis nilai tambah pengelolaan sampah organik menjadi pupuk kompos, serta menganalisis strategi pengelolaan sampah berbasis masyarakat (PSBM) berkelanjutan. Penelitian ini menggunakan metode Likert untuk menganalisis persepsi masyarakat, metode Hayami untuk menganalisis nilai tambah, dan analisis SWOT untuk menganalisis strategi PSBM. Berdasarkan hasil penelitian, masyarakat merasakan pengaruh positif maupun negatif dalam aspek ekonomi, sosial, dan lingkungan terhadap Akkom. Pengolahan sampah organik menjadi pupuk kompos Akkom memberikan nilai tambah sebesar Rp492,00/kg dengan tingkat keuntungan 97,46% atau Rp479,50/kg bahan baku sampah organik. Strategi pengelolaan yang dapat dilakukan oleh Akkom yaitu bekerjasama dengan pemerintah dan organisasi kepemudaan untuk meningkatka n partisipasi masyarakat., As much as 90.8% of DKI Jakarta residents' waste is not managed, prompting the government to oblige the public to manage household waste. Akademi Kompos Jakarta (Akkom) is one of the waste management groups with various excellent programs. The purpose of this study was to analyze public perceptions, analyze the added value of managing organic waste into compost, and analyze sustainab le community-based waste management (PSBM) strategies. This study uses the Likert method to analyze people's perceptions, the Hayami method to analyze added value, and the SWOT analysis to analyze the PSBM strategy. Based on the results of the study, the community felt positive and negative influences in the economic, social, and environmental aspects of Akkom. Processing organic waste into compost Akkom provides added value of Rp492,00/kg with a profit rate of 97,46% or Rp479,50/kg of raw materials for organic waste. The management strategy that can be carried out by Akkom is collaborating with the government and youth organizations to increase community participation.
Keyword: composting, Hayami method, Likert method, SWOT analysis, waste bank

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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