Judul: Analisis Biaya-Manfaat Perusahaan Pengelola Limbah Bahan Berbahaya dan Beracun (B3) dan Skenario Pengelolaan yang Efektif
Abstrak: The deferment of hazardous wastes management caused by its huge costs become an opportunity for the growth of hazardous wastes utilization and processing services industry. The number of this industry is quite small in Indonesia, therefore this research is trying to know further about the economic feasibility of these wastes management services activities by using benefit and cost analysis, and evaluating its response by changing the possiblity on quantity of wastes changes. It is obtained that these activities would be returned in the 8th year since it is started, with the number of NPV to be Rp 110 997 445 852, IRR to be 17% and Net B/C to be 3 by benefit and cost analysis, so it is feasible to be developed further. It needs to be considered when there is a decrease in number of entry wastes which are more than 30%. The existance of this industry become an alternatif to solve hazardous management problems. By using cost effectiveness analysis, it can be decided which one is the best sollution, wheter wastes should be handled autunomusly/being utilized or by using these services. In limited budgeting condition of fly ash wastes management, handled by these services is more effective because when it is utilized to be paving block its cost is 2,14 times bigger, but in unlimited budgetting condition, utilizing those to be paving block is profitable. Cost ratio for paper sludges which are handled by these services is 8.85 bigger than handled autonomously by utilized to be low grade paper. Handling the number of solvent wastes which are less than 60 liters/day by these services is more effective than investing an purifier machine because its investing cost is 1.022 times bigger, but when it is more than 60 liters/days, the cost ratio for handled by these services is 3,26 times bigger. It is costly more effective to use these services for about 1-1177 kg/day and 1281-4007 kg/day while investing an incinerator is cheaper for 1178-1280kg/day and for more than 4007 kg/day medical wastes management
Keyword: solvent,, paper sludge treatment, medical waste, hazardous wastes management, fly ash, cost effectiveness, Bogor Agricultural University (IPB)

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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