Judul: The Meiobenthos Abundance as Bioindicators of Tangerang Coastal TWaters
Abstrak: Sediment at five stations along 54 points on Tangerang coastal waters were investigated to study meiobenthos abundance as bioindicators and the relationship between grain size and TOC. They were analyzed using N/C ratio and Spearman rank correlation. Sediment samples were collected during April and August 2013 and identified to the different taxa level. Nematodes were dominant taxa (90.81%), followed by Polychaeta (3.14%), Copepods (3.07%), Sarcomastigophora (2.46%), and Oligochaeta (0.53%) in all sampling sites. The meiobenthos was primarily represented by Nematodes amount 2029 ind/10 cm2. Meiobenthos diversity, dominancy, and evenness were not significantly different among the five sites. The density of meiobenthos organisms are positively correlated with the grain size and negatively correlated with TOC. The values of N/C ratio >1 indicated that Tangerang coastal waters have highly polluted by organic matter.
Keyword: Tangerang coastal waters, sediment, organic matter, meiobenthos, bioindicators

Judul: Kelimpahan Makrozoobenthos sebagai Bioindikator Cemaran Organik Di Sungai Cibala, Sukanagara, Cianjur
Abstrak: Macrozoobenthos are organisms living on the bottom and have a long life cycle so that they can be used as bio-indicators. This study is to determine the index of macrozoobenthos diversity as of the bio-indicators of organic contained in Cibala River, Sukanagara, Cianjur, and to determine the condition of the water quality based on physical, chemical, and biological parameters. Macrozoobenthos communities found in the River Cibala consisted of 9 order i.e Odonata, Ephemeroptera, Plecoptera, Diptera, Coleoptera, Gastropoda, and Lumbriculida. The results showed that Aeshna could be used as bio-indicators of clean water and Hirudo could be used as bio-indicators of polluted water. Diversity and evenness index was highest at the middle station (H '=2.76 and E=0.97). Based on the OQR value (Overall Quality Ratings) on the upper and middle stations show the same value is 4, meaning that the water status are well. While OQR value on the downstream stations value is 3, meaning that the water status are have been contaminated organic matter. Based on the EPT index the upstream station is very well (66,84%), middle station is good (33,34%), and the downstream station is good enough (13,07%).
Keyword: river Cibala., macrozoobenthos abundance, organic matter

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