Judul: Efektivitas Pemberian Hidrogen Peroksida Terhadap Kualitas Media, Kelangsungan Hidup dan Pertumbuhan Benih Ikan Patin Pangasius sp.
Abstrak: Environment manipulation techniques are required to improve survival rate and growth of the fishes, one of the commonly used techniques is by chemical. The purpose of this research was to analyze the effectivity of peroxide hydrogen on water quality improvement as culture media and to determine the optimum concentration of peroxide hydrogen to maximize the production performance of Pangasius sp. 30 Pangasius sp. tanks with initial length of 2,72±0,03 cm and initial weight of 0,25±0,00 g were stocked into tanks with dimension of 0,29 x 0,19 x 0,17 m3 in 3 treatments and 3 replications. Fish were fed with commercial feed for 35 days and the growth response was observed. The results showed that the water quality after peroxide hydrogen 12 ppm addition in media was able to improve DO (dissolved oxygen) efficiency, decrease ammonium level and total aquatic bacteria (total plate count). The addition of peroxide hydrogen also gave good spesific growth rate respond to jouvenil Pangasius sp.
Keyword: Bogor Agricultural University (IPB), Pangasius sp., hydrogen peroxide, growth, Efficiency level

Judul: Efektifitas Penambahan Zeolit dan Karbon Aktif Terhadap Kelangsungan Hidup Benih Ikan Patin Pangasionodon sp. Pada pengangkutan Sistem Tertutup
Abstrak: The problem often faced by Indonesian farmers in striped catfish (Pangasionodon sp) fry transportation is low survival rate due to changes in water quality during transportation caused by high consentration of CO2, ammonia accumulation, fish activity, bacterial infection and physical wound from rough handling. An attempt done to neutralize toxic ammonia that is by adding zeolite and active carbon to packing medium, where the zeolites and activated carbon is a material capable of adsorbing ammonia for a certain time. This research used zeolite and carbon composition A (20 g zeolite), B (15 g zeolite + 5 g activated carbon), C (10 g zeolite + 10 g activated carbon), D (5 g zeolite + 15 g activated carbon) and E (20 g activated carbon). Fish density used 300 fry/ℓ for 72 hours every 24 hours samples were taken to measure water quality (DO, TAN, NH3, pH, temperature, CO2). This research resulted thst 5 g zeolite + 15 g activated carbon addition gave the best results with the highest survival rate of 83.3 ± 6.79%, TAN concentration of 4.6816 ± 0.628 mg / ℓ and NH3 concentration of 0.0228 ± 0.005 mg / ℓ, the temperature of 19.7 to 22 ° C, DO of ± 1.99 mgO2, CO2 sebesar 62,84± 5,53 mg/ℓ.
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Judul: : Persamaan Tunggal sebagai Representasi Kurva Komposit
Abstrak: A mathematical method is introduced to represent a composite curve based on an extension of analytic geometry. The representation is given either with a single equation or with two equations, in the case of parametric representation. This method permits the representation of composite curves in similar manner to the conventional representation of non-composite curves. Some mathematical tools, including Heaviside unit step function and periodizer function, are used in the establishment of a single equation. In this paper, regular equations of regular and irregular polygon, as well as composite curves of two dimensions, are implemented using a computer algebraic system, Mathematica.
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