Judul: Analisis Bioakumulasi Timbal (Pb) Pada Ikan Nila Merah (Oreochromis nilotica) dan Patin Jambal (Pangasius djambal) yang Dibudidayakan di Kolong Tua pasca Tambang Timah Bangka Belitung
Abstrak: The consequences of tin mining activity is the formation large basin-shaped holes filled with water in which the local (Bangka Belitung islands) term is a Kolong or Camuy (lake). Heavy metal concentrations are still high in all the pit and endangering human health; is the image that is in today's society so that people refused to eat the fish from or doing aquaculture activities in kolong. The study was conducted from October 2011 to February 2012 in Kolong Grasi, District Sungailiat Bangka Regency, Province of Bangka Belitung Archipelago at coordinates S01052.464 '; E106007.005. Chemical analysis carried out at the Laboratory of Industrial Technology of Agricultural, Aquaculture Environmental Laboratory, Fish Nutrition Laboratory, IPB. Materials used in this study are meats, gills, liver and kidneys of red tilapia and jambal catfish. Organ samples taken each month from October 2011 to February 2012. Chemicals for testing heavy metal Pb is the standard solution at a concentration of 1000ppm Pb from BDH, concentrated nitric acid from Merck and distilled water. The equipment used is the pH meter, DO meter, analytical neraca, a ruler, a set of surgical instruments, two units of floating net cage with the dimension 3m x 3m x 2m of each, and pH-meters, a set of Atomic Absorption Spectrometry tools (AAS) AA 300 P type from Varian Techtron Australia, 50ml beaker glass, 10 ml volumetric flask, 5ml vial size polyethylene, 10-100mL effendorf micro pipettes, analytical balance, furnace, hot plate, Mercury Vaporise Unit (MVU) and other glassware equipment used in labs. The study began with measurements of heavy metals lead (Pb) in water and sediment once at the beginning of the study. Measurement of water quality include physical parameters are: temperature, pH, brightness, and chemical parameters including DO, CO2. Measurements were made directly in the field. Measurement of chemical parameters such as: Total Organic Matter (TOM) and Pb performed in the laboratory at the beginning of the fish culture period and then performed each month at the site of cultivation. Measurement of Pb content in the sediment is also done once in the early of the study. All data was analyzed using the comparison of two mean values (t-test). The results of gut contents identification of fish are presented in tabulated and all the relationships described in the descriptive parameters. Physico-chemical quality of water in Kolong Grasi is ideal for red tilapia aquaculture and jambal catfish. Several parameters such as temperature, brightness decreased and increased levels of TOM in January 2012 and did not occur in previous months dueto the rainy season in January 2012. Pb heavy metal content in the red tilapia was found in the first month of cultivation, the month of November is 0,085μg/g in liver. In the third month (January 2012), lead is found in almost every organ of red tilapia and exceed safe levels for consumption, ie 8,41 μg/g in the gills, 93,98 μg/g in kidney, 62,14 μg/g in the liver and undetectable in meat. Accumulation of the heavy metal in the meat of red tilapia is found 0,188 μg/g in the mont of fourth (February 2012). The highest
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Judul: Analisis Kandungan Logam Berat Pb, Cu, dan Cd pada Ikan Nila (Oreochromis niloticus Linnaeus, 1758) Budidaya di Waduk Cirata, Jawa Barat
Abstrak: Waduk Cirata memiliki potensi yang besar baik dalam bidang ekonomi, maupun ekologi. Meskipun begitu, Waduk Cirata sangat rentan terhadap tekanan akibat aktivitas manusia, baik yang berasal dari dalam perairan waduk maupun dari Daerah Aliran Sungai (DAS) Citarum. Penelitian ini bertujuan menentukan kontaminasi kandungan logam berat timbal (Pb), tembaga (Cu) dan kadmium (Cd) pada ikan nila yang dibudidayakan dan hubungannya dengan kualitas perairan di Waduk Cirata. Konsentrasi logam berat dianalisis menggunakan AAS. Kandungan logam berat tertinggi pada ikan nila adalah Cu pada organ ginjal yakni 7,8 mg/kg. Kandungan logam berat tertinggi pada air yaitu Pb yakni 0,210 mg/L. Nilai Bioconcentration Factor (BCF) pada logam Pb sebesar 0,559, Cu 49,166 dan Cd 1,000. Nilai MTI (Maximum Tolerable Intake) untuk orang dewasa (60 kg) pada logam berat Pb sebesar 16,67 kg/minggu, Cd 0,13 kg/minggu dan Cu 11052,63 kg/minggu. Penelitian menunjukkan bahwa kadar Pb, Cu dan Cd tidak sesuai dengan baku mutu yang telah ditetapkan., Cirata Reservoir is great potential both in the economic and ecological fields. However, this Cirata Reservoir is very vulnerable to pressure due to human activities, both from within the reservoir waters and from the Citarum River Watershed (DAS). This study aimed to determine the contamination of the heavy metal content of lead (Pb), copper (Cu) and cadmium (Cd) in cultivated tilapia and its relationship with the quality of waters in the Cirata Reservoir. Heavy metal concentrations were analyzed using AAS. The highest heavy metal content in tilapia is Cu in the kidney, with concentration 7.8 mg/kg. The highest heavy metal content in water is Pb, with concentration 0.210 mg/L. Bioconcentration Factor (BCF) values of Pb 0.559, Cu 49.166 and Cd 1,000. The MTI (Maximum Tolerable Intake) value for adults (60 kg) for heavy metal Pb is 16.67 kg/week, Cd 0.13 kg/week and Cu 11052.63 kg/week. The research shows that the levels of Pb, Cu and Cd are not in accordance with the established quality standards.
Keyword: Cirata reservoir, heavy metals, nile, MTI, tilapia, water

Judul: Formulasi Algoritme Operasi Grup Jacobian Kurva Hyperelliptic ...
Abstrak: Dalam geometri aljabar, kurva hyperelliptic merupakan bentuk umum dari kurva elliptic. Kurva ini apabila dikenakan pada suatu lapangan berhingga akan membentuk suatu grup siklik. Pada kriptografi, khususnya enkripsi kunci publik, grup siklik yang dibangkitkan oleh kurva elliptic sudah banyak diteliti. Bahkan untuk kurva ini sudah memiliki standar oleh National Institute of Standard and Technology (NIST) Amerika. Sedangkan, untuk grup yang dibangkitkan oleh kurva hyperelliptic masih memiliki kekurangan dalam hal komputasinya. Tujuan dari penelitian ini adalah mengkonstruksi suatu lapangan berhingga pada , memilih kurva hyperelliptic atas lapangan hingga yang memenuhi kriteria keamanan untuk kriptografi, dan membuat formulasi operasi grup kurva hyperelliptic menggunakan algoritme Cantor. Dalam merekonstruksi lapangan hingga, terlebih dahulu tentukan dimensi dari lapangan hingga tersebut dan polinomial tak-teruraikan. Kemudian dipilih kurva hyperelliptic atas lapangan tersebut. Pada penelitian ini, kurva yang dipilih adalah = + + dengan lapangan hingga . Berdasarkan kurva yang dipilih, akan dibentuk suatu operasi grup dengan menggunakan algoritme Cantor, sehingga menjadi lebih aritmatik. Eksplorasi kurva hiperelliptic dilakukan untuk mengetahui keamanan dari kurva yang dipilih. Dengan menyusun algoritme operasi grup dari kurva yang dipilih, diperoleh perhitungan yang lebih aritmatik dan dapat diimplementasikan pada kriptografi kunci publik. Dari segi keamanan kurva telah memenuhi standar sehingga tahan terhadap serangan-serangan seperti Poligh-Hellman, Polard- , ataupun Frey-Ruck secara teorema.
Keyword: algoritme Cantor, kriptografi, kunci publik, kurva hyperelliptic, operasi grup