Judul: Kajian Paparan Bisfenol-A (BPA) Dari Botol Susu Polikarbonat Pada Bayi. Studi Kasus : Wilayah DKI Jakarta
Abstrak: Polycarbonate (PC) has become one of the most popular choice as acontainer/food packaging plastic for baby milk bottles. This plastic is made by bisphenol-A (BPA) as a binder to improve plastic properties of a hard, clear, and light. However, behind the advantages, the reversed and the use of the polycarbonate as a raw material of bottle, stores hazard for human health. BPA is small molecule and carcinogenic. This compound is easily off or leach from the polymer matrix and then migrate to the food package. The study was conducted to determine the value of the average daily intake of BPA from baby milk bottle made from PC in Jakarta capital area. The Babies are in the zero month until three years old. It was also to estimate exposure value of the bisphenol-A and compared it with the value of the TDI (Tolerable Daily Intake). The data of food consumption, chemical level in food and baby weight were obtained by respondent survey in food consumption. Furthermore, all three of these data were used as the basis for exposure calculation. This value and then was evaluated against TDI. This study resulted on estimated value of exposure of the population was 0.0023 mg bisphenol-A/body weight/day. This number is still less than TDI (Tolerable Daily Intake) allowed by Food and Drugs Administration U.S (FDA) as much as 0.05 mg polycarbonate/body weight/day.
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Judul: Kajian Risiko Bisfenol A dari Kemasan Makanan Kaleng.
Abstrak: Bisfenol A merupakan senyawa kimia sintetik yang dapat mengganggu sistem endokrin. Sumber utama paparan bisfenol A pada manusia adalah melalui makanan dan minuman yang sudah kontak dengan plastik polikarbonat atau epoksi resin. Bisfenol A dalam bentuk epoksi resin biasanya digunakan sebagai enamel atau pelapis kemasan makanan kaleng. Bisfenol A mempunyai risiko mengalami migrasi dari kemasan ke makanan. Kajian risiko dilakukan untuk memperkirakan tingkat risiko bisfenol A dari makanan kaleng. Kajian risiko dalam penelitian ini dilakukan dengan studi pustaka mengenai bahaya dan risiko dari bisfenol A, survei konsumsi makanan kaleng dengan metode wawancara menggunakan food frequency questionaire (FFQ) di Jakarta Selatan dan Jakarta Utara, tabulasi data survei dari 6 provinsi di Indonesia, penentuan konsentrasi migrasi bisfenol A yang digunakan untuk perhitungan paparan, dan analisis data. Hasil survei menunjukan bahwa jenis makanan kaleng yang paling banyak dikonsumsi oleh responden adalah susu sterilisasi siap minum, susu kental manis, dan ikan. Karakteristik responden dengan rata-rata asupan makanan kaleng yang relatif tinggi adalah responden yang memiliki pekerjaan wiraswasta, pendidikan formal sarjana, usia 26-45 tahun, jenis kelamin laki-laki dan berat badan relatif gemuk. Hasil estimasi paparan menunjukan bahwa nilai persentil ke-90 paparan bisfenol A adalah 9.31 x mg/kg BB/ hari yang masih jauh dibawah TDI.
Keyword: bisfenol A, enamel, kajian risiko, makanan kaleng, migrasi

Judul: Penggunaan Metode Homotopi untuk Menyelesaikan Masalah Nilai Eigen pada Suatu Model Getaran
Abstrak: Most mathematical models of natural phenomena are nonlinear model. One of the nonlinear problems is a problem of vibration which can be considered as an eigen value problem. Here, the nonlinear factor appeared due to the external forces applied to the system. The vibration problem in this study, was solved using the homotopy method. The homotopy method is analytical approach in the nonlinear problems within the series form. The terms of the series were obtained based on a recursive formula in a high deformation. A convergent solution of the series dependent on both the homotopy parameter and the coefficient of nonlinear factors appeared in the model.
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