Judul: Produksi Larva Lele Sangkuriang Clarias sp. dari Ukuran Induk 0,8-1,5 kg dengan Pemberian Pakan Awal Cacing Sutera dan Artemia sp.
Abstrak: The important factors that affect fish seed productivity are quality of brood fish and rearing management of the seed, especially at the early phase. The research was conducted to evaluate survival rate and growth catfish fry produced by different size of brood fish and that fed on different type of early fish feed. There were two size category ofthe brood fish, namely small (S ,weight of 0,8-1,0/fish) and large (L, 1,5kg/fish). This research used 4 treatments that were larvae from the small brood fish were fed on Artemia nauplii (Treatment KA) or fed on Tubifex larvae (KC), larvae from the large brood fish were fed on Artemia nauplii (BA) or fed on Tubifex larvae (BC). The larvae were fed on the early feed as long 4 days, and after that all fish fed on Tubifex until end of the rearing periods (17days). The researsh showed that survival rate of catfish fry that came from different size of brood fish and that fed on different type of early fish feed was not different, whereas the growth rate fry came from large brood fish and that fed on either Artemia or Tubifex (BA and BC) were higher than the others.
Keyword: Tubifex., Sangkuriang Catfish larvae, Brood fish, Artemia

Judul: Kualitas media budidaya dan produksi ikan lele sangkuriang Clarias sp. yang dipelihara pada sistem resirkulasi dengan kepadatan berbeda.
Abstrak: Increasing demand for catfish and the need of anticipation for aquaculture productionadecreasedaasaresultafromashrinkageaofacultivatedaland and deturatio n water quality in catfish media causes catfish cultivation should be done intensively by through improvement of culturing technology, one of them is throught utilization of a recirculation system in order to maintain water quality. Therefore, this experiment will observe at changes of water quality that occur in catfish rearingnponds at different stockingadensity whichausinga recirculation system. The purpose of this experiment was to analyze the changes in water quality, growth, survival and differences in the production growth of Sangkuriang catfish Clarias sp. in the outdoor recirculation system with different stocking density as a base for determining the optimal stocking density. The experimentawasaimplementedafromaAugustato Septembera2011,aatathe Installati on ofaAquacultureaEnvironmental Research and Toxicology, Cibalagung, Bogor. The design of the experiment is Randomized Complete Design with 3 treatments and 3 replications. The treatments include 50 ekor/m2, 100 ekor/m2 dan 150 ekor/m2. Water quality measurements performed on a regular basis, consisting of physical and chemical character of maintenance water media that ware temperature, pH, DO, ammonia, nitrites and nitrates as well as measurement fish biology parameters include, SR, SGR, the absolute growth weight and length. The results showed that different stocking density that used in each treatment produces changes of water quality still within the normal range for rearing Sangkuriang catfish Clarias sp . The treatment that gives the growth, survival and production results of best is the 150 ekor/
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Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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