Judul: Heavy Metals Residue of Pb and Fe in Water and  Sediment in River of Cinangka Village, Bogor
Abstrak: DANDY RISWANDI. Kandungan Logam Berat Pb dan Fe pada Air dan Sedimen di Sungai Desa Cinangka, Bogor. Dibimbing oleh SIGID HARIYADI dan ETTY RIANI. Limbah daur ulang aki bekas mengandung logam berat yang bisa mengganggu kesehatan manusia dan biota. Penelitian kandungan logam berat pada air dan sedimen di Sungai Desa Cinangka, Bogor belum pernah dilakukan. Penelitian ini bertujuan menganalisis kandungan logam berat Pb dan Fe pada air dan sedimen di Sungai Desa Cinangka, Kabupaten Bogor berdasarkan perbandingan dengan peraturan yang sudah ditetapkan. Penelitian dilaksanakan pada September 2023 hingga Juni 2024 Analisis logam berat pada air menggunakan metode AAS (Atomic Absorption Spectrofotometry). Analisis logam berat pada sedimen menggunakan XRF (X-Ray Fluoresence). Kandungan logam berat Pb dan Fe pada air dan sedimen di Sungai Desa Cinangka melebihi baku mutu yang sudah ditetapkan, DANDY RISWANDI. Heavy Metals Residue of Pb and Fe in Water and Sediment in River of Cinangka Village, Bogor. Supervised by SIGID HARIYADI and ETTY RIANI. Used battery recycling waste contains heavy metals which can harm human health and biota. Research on heavy metal residue in water and sediment in Cinangka Village, Bogor Regency has never been carried out. This research aims to analyze the residue of heavy metals Pb and Fe in water and sediment in the Cinangka Village River, Bogor Regency based on comparison with established regulations. The research was carried out from September 2023 to June 2024. Analysis of heavy metals in water using the AAS (Atomic Absorption Spectrofotometry) method. Analysis of heavy metals in sediment using XRF (X- Ray Fluoresence). The residue of heavy metals Pb and Fe in the water and sediment in the Cinangka Village River exceeds the established quality standards
Keyword: air, sedimen, sungai, besi, timbal

Judul: Analysis of the heavy metal Pb and Fe content of  susuh kura (Sulcospira testudinaria) in rivers in Cinangka Village, Bogor Regency
Abstrak: Desa Cinangka merupakan daerah yang tercemar oleh logam berat yang disebabkan oleh kegiatan pembakaran atau peleburan aki bekas. Kualitas logam berat yang terdapat pada sungai di Desa Cinangka akan mempengaruhi kandungan logam berat yang terdapat pada keong. Penelitian mengenai analisis kandungan logam berat terhadap keong susuh kura (Sulcospira testudinaria) di Sungai Desa Cinangka masih sangat minim. Penelitian ini bertujuan untuk menganalisis tingkat bioakumulasi logam Pb dan Fe pada keong susuh kura (Sulcospira testudinaria) di Sungai Desa Cinangka Kabupaten Bogor. Kandungan logam berat Pb dan Fe pada air berkisar antara 0,0497 – 4,1748. Kandungan logam berat Pb dan Fe pada keong susuh kura berkisar antara 10,82 – 3364,62. Bioakumulasi logam berat Pb dan Fe pada keong susuh kura tergolong dalam akumulasi sedang. Hasil meta-analisis menunjukkan bahwa tidak terdapat perbedaan yang signifikan antara rata-rata kandungan logam berat Pb dan Fe pada keong susuh kura dari beberapa negara. Logam berat dapat memengaruhi organisme perairan yang terakumulasi dalam beberapa organ dan dapat memengaruhi kelangsungan hidup dan pertumbuhan, Cinangka Village is an area polluted by heavy metals caused by the burning or smelting of used batteries. The quality of heavy metals found in the river in Cinangka Village will affect the heavy metal content found in snails. Research on the analysis of heavy metal content in snails (Sulcospira testudinaria) in the Cinangka Village River is still very minimal. This study aims to analyze the level of bioaccumulation of Pb and Fe metals in snails (Sulcospira testudinaria) in the Cinangka Village River, Bogor Regency. The content of heavy metals Pb and Fe in water ranged from 0,0497 – 4,1748. The content of Pb and Fe heavy metals in snails ranged from 10,82 – 3364,62. Bioaccumulation of heavy metals Pb and Fe in snails is classified as moderate accumulation. The results of the meta-analysis showed that there was no significant difference between the average content of heavy metals Pb and Fe in snails from several countries. Heavy metals can affect aquatic organisms that accumulate in several organs and can affect survival and growth
Keyword: Logam berat, heavy metal, bioakumulasi, keong susuh kura, bioaccumulation, snail

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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