Judul: Korelasi kualitas air terhadap kinerja pertumbuhan benih ikan patin Pangasius hypophthalmus ukuran 1 inci di Balai Pengembangan Budidaya Air Tawar Subang
Abstrak: The purpose of this study was to examine the correlation of water quality fluctuations in temperature, dissolved oxygen, and pH on the growth performance (length and weight) of catfish seeds size 1 inch at the age of 10, 20, and 30 days in Freshwater Aquaculture Development Center of Subang. The method used in this study are correlational type of field surveys to determine actual water quality conditions that affect fish growth performance. Water quality is correlated to the growth performance of catfish seeds is 10 days old the temperature ranged from 24.00 to 30.50°C, which inhibits the growth of seeds due to temperature fluctuations down 5.25°C within 4 hours. When seeds 20 days old, and the fluctuations ranged from 7.97 to 8.03 pH conditions favor the growth of the seeds. When seeds 30 days old, fluctuations in water quality not affect growth performance, presumably because body size is already relatively large seeds and has been able to adapt to changes in their environment.
Keyword: water quality., growth performance, fluctuations, correlations, catfish seeds Pangasius hypophthalmus

Judul: Kelangsungan hidup benih ikan patin Pangasionodon sp. ukuran 1 inci pasca pengangkutan menggunakan sistem tertutup dengan media bersalinitas 1, 2 dan 3 ppt.
Abstrak: Pangas catfish is one of aquaculture main commodity in Indonesia and a commodity with significant increase production during 2007-2008. Suppliers often encounter a problem from the low survival rate during the fry transportation which is caused by poor water quality. Therefore, a research to increase the survival rate on closed system transportation as an effort to increase profit on fish marketing is needed. Osmoregulation (osmotic pressure) is a parameter changed during transportation. The change itself can be balanced with salinity addition, which in turn affect the organism osmoregulation. Determining the optimal salinity will affect fry survival rate during transportation. The research was conducted between April 2010 and May 2010 at Laboratory of Production Technique and Management Aquaculture, Aquaculture Department, Faculty of Fisheries and Marine Science, Bogor Agriculture University. Water quality parameters was measured at Environmental Laboratory, Aquaculture Department, Faculty of Fisheries and Marine Science, Bogor Agriculture University and osmotic pressure measurement was conducted at Embriology Laboratory, Veterinary Faculty, Bogor Agriculture University. Fish rearing pre and post transportation treatment was conducted at Yohanes Tropical Fish Farm, Cogreg Village, Parung, Bogor. This research used 1 inch fry with 2,58±0,03 cm average length and average weight 0,21±0,02 gram provided from Cogreg Village, Parung, Bogor Regency, West Java. The fry was transported in 12 Poly Ethylene (PE) plastic bag filled with 1,25 litre water. Whereas post transportation fish located in 12 aquarium filled with 144 litre water at 30 cm water height. During fry rearing, the fry were fed on shrimp feed (protein 40%) twice a day at morning and afternoon with at satiation method. Water at the aquarium was changed by 10% everyday (5% in the morning and 5 % in the afternoon). Results on salinity addition on transportation media after 3 days post transportation showed survival rate 90%; 91%, 94,67% and 96,33%; and market profit Rp 6.259.935,00; Rp 7.272.935,00; Rp 8.731.315,00; and Rp.9.477.555,00 respectively. Salinity addition on the transportation water medium 0 ppt, 1 ppt, 2 ppt and 3 ppt affect survival rate of pangas catfish fry (P>0,05). Salinity at 3 ppt gave the highest fry survival rate and market profit
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Judul: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix