Judul: Prototipe Sumber Energi Biolistrik dengan Sistem Microbial Fuel Cell pada Perairan Menggenang dan Mengalir
Abstrak: Prototipe microbial fuel cell merupakan rancangan alat aplikasi langsung dari sistem MFC yang bersifat modern dan ekonomis. Alat ini memiliki rangkaian satu bejana yang terdiri dari kombinasi elektroda katoda dan anoda berjumlah sepuluh pasang yang dirangkai secara seri. Penelitian ini bertujuan menentukan potensi kinerja prototipe microbial fuel cell dan membandingkan nilai elektrisitas pada kondisi perairan menggenang dan mengalir. Kandungan nilai BOD tertinggi terdapat pada perairan menggenang dengan nilai permukaan 73.52 ± 0.79 mg/L, kolom 84.03 ± 0.79 mg/L, dasar 91.33 ± 0.79 mg/L. Nilai COD tertinggi terdapat pada perairan menggenang dengan nilai permukaan 91.94 ± 0.25 mg/L, kolom 98.75 ± 0.25 mg/L, dasar 104.98 ± 0.25 mg/L. Nilai kecepatan arus sungai sebesar 0.5 m/s. Prototipe microbial fuel cell pada perairan menggenang dan mengalir memberikan potensi kinerja terhadap nilai tegangan listrik dari MFC. Nilai tegangan listrik dan arus listrik tertinggi terdapat pada perairan menggenang yaitu 3.56 V dan 0.06 mA. Kandungan nilai BOD dan COD yang tinggi pada perairan menggenang menghasilkan nilai tegangan listrik yang tinggi pada MFC.
Keyword: elektrisitas, karakteristik perairan, prototipe microbial fuel cell

Judul: Kinerja Microbial Fuel Cell Penghasil Biolistrik dengan Elektroda yang Berbeda pada Limbah Cair Industri Perikanan
Abstrak: Microbial Fuel Cell (MFC) is one example of an alternative technology that has the potential to be developed as a substituent energy because this fuel cell converts chemical energy into electrical energy through the catalytic reaction using the microorganism.This technologycan beapplied for wastewater treatment such asfisherywastewater thatcontainsa lot of nutrient. The purpose of this studywas to determine the performance of the MFC system infisherywastewaterin resulted theelectricity and reduce the burden of waste with the use of different types of electrodesnamely aluminum, iron, graphite carbon, anda combination of aluminum and graphite carbon. Results of electricity during the 120 hours observations as a whole ranging from aluminum to aluminum with carbon graphite combinations are 0.23V, 0.17V, 0.19V and 0.34V. The results showed that the MFC system couldreduce the average total N respectively of 61%, BOD of 30.11%, COD of 59.34% and the Total Nitrogen Amoniaof 12.45%. Increasing biomass occured at the end of observation respectively with a value of MLSS and MLVSS of 7066.67 mg/L and 6000 mg/L.
Keyword: microbial fuel cell., fishery wastewater, electrode, bioelectricity

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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