Judul: Status cemaran logam timbal (Pb) pada mahasiswa fakultas peternakan Institut Pertanian Bogor
Abstrak: Lead (Pb) has been intensively used in industry. Application of Pb creates environmental and health problems. Present experiment aimed to clarify the exposure of Pb as pollutant on the student of Faculty of Animal Sciences, Bogor Agricultural University and its relation to their activities and diets. Hair samples of 5-10 g each were obtained from 25 male and 25 female students. Concentration of Pb, Ca, Zn and Mg in hair was determined using an atomic absorption spectrophotometer. Questionnaire was offered to the students, to evaluate their activities and diets. Concentration of Pb in hair samples obtained from the male and female students was not different. However, Ca, Zn and Mg concentration in the hair of male students was higher (P<O.Ol) than that of female students. Lead concer~tration in the hair could be associated with the exposure level of the students to the polluted air. Protein intake in male and female students was 33.82 glday and 34.94 glday, respectively. It was concluded that the students were exposured to Pb polluted-air. The activities and diets of the students had no effect on the level of Pb in their hair. Key words: lead, hair, activity, diet, protein.
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Judul: IPB (Bogor Agricultural University)
Abstrak: Since the year of 2000, UNEP (United Nations of Environmental Programe) identifies that the ever increasing Carbon Dioxide (CO2), Methane (CH4) and Nitrous Oxide (N2O) have caused global warming. In addition, carbon dioxide (CO2) and nitrous oxide (N2O) along with sulphure oxide (SOx) and hidrogen sulfide (H2S) gasses have caused acid deposition. In turns, this deposition can stretch out endlessly heavy metal like lead and is accumulated in roughages which makes it harmful for animal production. In the other case the meat supply is still insufficient in Indonesia. Therefore, to fulfill the supply several efforts should be carried out. One of them is by increasing sheep production which is based on the reason that goat is prolific and high litter size. Howefer this effort cannot be achieved due to the presence of acid deposition and condition which bind heavy metals such as lead. These two substances will result in the decreasing daily gain of sheep because of the Pb accumulation in liver, kidney, as well as flesh. Accordingly, this research is aimed at: a. finding out whether acid rain has taken place in Bogor Regency area and subsequently finding out the Pb content in soil and roughage in this region. b. predicting corelation Pb content between rain and soil, as well as between soil and roughage in the Bogor regency area. c. studying the acid impact and Pb in the sheep ration toward sheep daily gain and toward the Pb content in liver, kidney and flesh. The result showed that in Bogor regency area acid deposition on had taken place the dry season but not in the wet season. The Pb content both in the air and in the soil had not yet been affected by acid rain. Pb content from the soil did not affect the content in the roughage. The dry and organic matter digestibility of the acid ration is lower than that of the non-acid ration. The dry and organic matter digestibility of the Pb-ration is lower than that of the non-Pb-ration. Similarly, the VFA production of acid ration was lower than that of the non-Acid ration. On the contrary, the N-NH3 production of acid ration was higher than that of the no-acid ration. The Pb ration has higher N-NH3 production than that of the non-Pb ration. Acid ration decreased daily gain, but ration of high Pb-content did not affect the daily gain. Acid ration did not increase Pb content in the kidney but not in the liver and flesh. However, high Pb content in the ration will increase the Pb content of liver and kidney but not in the flesh.
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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