Judul: Feasibility Analysis of Organic Waste Biopellet in Regional Landfill of Kebon Kongok in West Nusa Tenggara
Abstrak: Pertumbuhan penduduk Indonesia mempengaruhi produksi sampah yang dihasilkan oleh tiap rumah tangga. Pengelolaan sampah yang tepat dan efektif dapat dilakukan dengan cara 5R (Reuse, Reduce, Recycle, Refuse, dan Rot). Sampah organik dapat didaurulang menjadi biopelet seperti yang dilakukan oleh TPA Regional Kebon Kongok, Nusa Tenggara Barat. Biopelet tersebut akan digunakan sebagai bahan baku untuk co-firing batubara di PLTU Jeranjang, NTB. Penelitian ini bertujuan untuk menganalisis kelayakan usaha dari aspek non finansial dan finansial serta analisis nilai pengganti. Metode yang digunakan adalah analisis kualitatif dan kuantitatif. Analisis kualitatif dilakukan pada aspek non finansial sedangkan analisis kuantitatif dilakukan pada aspek finansial. Hasil analisis menunjukkan bahwa usaha biopelet pada TPA Regional Kebon Kongok berdasarkan analisis aspek non finansial dapat layak untuk dijalankan namun dengan beberapa catatan. Sedangkan pada analisis aspek finansial menunjukkan usaha ini layak untuk dijalankan karena dapat memperoleh keuntungan.
Keyword: biopellet, financial and non-financial analysis, organic waste, switching value analysis

Judul: Analisis Kelayakan Usaha Pengelolaan Sampah Berbasis Komunitas di Provinsi DKI Jakarta
Abstrak: DKI Jakarta is one of regions with the biggest amount of waste in Indonesia. The amount of waste in 2010 was 6 139.33 tons per day and gradually increases up to 1.38% per year from 1987 to 2010. This research focus on analyze the management of community-based waste in the Village of Kapuk Muara, Penjaringan District, Jakarta Utara Province either based on the analysis of market aspects, technical aspects, management aspects, and socio-economicenvironmental aspects and financial aspects. There are two scenarios were used: (i) full investment from Pertamina CSR programs and (ii) alternative investment by non-governmental program. Based on market aspects, technical aspects, management aspects, and socio-economic aspects of the environment shows that community-based waste management business is feasible. Refer to financial analysis of both scenarios is feasible, respectively in scenario I and scenario II with NPV Rp48 345 205 and Rp130 972 376; IRR of 10.41 and 26.91 per cent; B / C ratio of 1.22 and 2.36 and PBP 7.7 and 4.85 years. Both scenarios are very sensitive to deviation of price the amount of plastic compared to the production of plastics.
Keyword: Bogor Agricultural University (IPB), waste banks, financial non-financial aspects, Cash flow

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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