Judul: Kualitas Pupuk Organik Cair dari Campuran Limbah Cair Tahu dan Kotoran Sapi.
Abstrak: Tofu waste water containing organic material out of complex as well as carbon and N is high. This will reduce the level of water quality and ultimately have a negative impact on aquatic ecosystems. Liquid tofu waste have a great potential to used as liquid organic fertilizer due to the nutrition contents that needed by plants. The objective of this research was to evaluate the quality of liquid fertilizer from liquid tofu waste. In this research use different ratios of 90%:10% (L90K10); 70%:30% (L70K30); and 50%:50% (L50K50). The variables of liquid fertilizer observed consist of pH, organic carbon (C), total nitrogen (N), phosphor (P), kalium (K), mangan (Mn), ferrum (Fe), and C/N ratio. Data were analyzed using analysis of variance and any significant differences were further tested using Tukey’s. The results showed that the treatments did not significantly affect (P>0.05) pH, Organic-C, Total-P, K, C/N ratio, Mn, Fe, and the treatments are significantly affect (P>0.05) Total-N.
Keyword: 

Judul: Pemanfaatan Limbah Cair Tahu sebagai Bahan Amelioran Tanah dan Pengaruhnya terhadap Pertumbuhan dan Produksi Tanaman Caisin (Brassica juncea L.)
Abstrak: Nowadays there are many marketable tofu-based food. In line with the increased growth of tofu industries, volume of tofu waste also increase progressively. The tofu industries produce solid waste and liquid waste. Solid waste is produced from the filtering and clumping processes. This kind of waste can be used as tempe gembus or animal food. Liquid waste is produced from washing, boiling and stamping. Tofu wastes cause numerous environmental problems. Liquid wastes contain a high amount of Chemical Oxygen Demand (COD), Biochemical Oxygen Demand (BOD), Total Suspended Solids (TSS), Total Dissolved Solids (TDS) and acidity (pH). Otherwise, liquid waste is rich of organic materials such as protein, carbohydrate, fat, oil and many more. Therefore a research to utilize tofu liquid waste as soil ameliorant is necessary. This research was aimed to investigate the effect of tofu liquid waste as soil ameliorant on plant growth and production. The research used Completely Randomized Design (CRD) with four levels of tofu liquid waste (0 m3/ha, 50 m3/ha, 100 m3/ha and 150 m3/ha). Plant indicator for this experiment was caisin (Brassica juncea L). The results showed that tofu liquid waste could improve chemical soil properties and showed positive influences on growth and production of caisin. The soil chemical properties values such as total nitrogen, available P, CEC (Cation Exchange Capacity), K+ and Na+ rised with increasing levels of tofu liquid waste. Application of tofu liquid waste with levels of 150 m3/ha effectively increased the soil fertility, and also the growth and production of caisin.
Keyword: Bogor Agricultural University (IPB), Tofu Liquid Waste, Soil Ameliorant, Caisin

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