Judul: Pengaruh Pemberian Pakan Artemia Terhadap Pertumbuhan Karang Lunak Sarcophyton dan Densitas Biota Asosiasi
Abstrak: The Research found that the growth rate of Sarcophyton which were fed with Artemia was higher than the control pond, up to 10 weeks. However, at week 11 and 12 there was a decrease of growth rate and followed by an increase of population of benthic biota associated with Sarcophyton at observation ponds. It is interesting for further studied. The purpose of this research is to study the relationship between the growth rate of Sarcophyton and the number of populations of associated benthic biota. The observations took place during the 3 months which were using the two ponds sized each (1x2x0.5) m3 contains 5 colonies. The first pond is not fed as control (A) and a second feeding Artemia 5 g /1 m3/week (B). Every weeks, researchers observed the growth rate and coral health and the condition of supporting such as physical parameters (temperature and salinity), chemical (concentrations of ammonia, nitrate, nitrite, and phosphate), and biological (density of association benthic biota). The results show that feeding Artemia had a significant (confidence interval 95 %) effect on growth of Sarcophyton and the density of associated biota. Observations show that the growth rate, the health value, and the amount of coral polyps coming out at treatment ponds tend to be lower than coral at control pond. Feeding Artemia cause an increase in the density of heterotrophic benthic biota so that increases the rate of oxygen consumption. This high oxygen consumption lead to decrease nitrate and phosphate concentrations. Decreasing levels of oxygen and increasing excretion of benthic biota caused ammonia levels to rise so that the health value of Sarcophyton decline.
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Judul: Pengaruh salinitas terhadap daya tetas siste artemia sp.
Abstrak: Penelitian dilakukan pada tanggal 18 Juni sampai dengan tanggal 2 Juli 1990 di Laboratorium Limnologi Fakultas Perikanan Institut Pertanian Bogor. Tujuan penelitian adalah mengkaji pengaruh salinitas terhadap penetasan siste Artemia sp. dan menentukan salinitas yang terbaik untuk menetaskan siste Artemia sp. dalam upaya menghasilkan larva stadia nauplius 1, 2, dan 3. Penelitian dibagi menjadi dua tahap, yaitu penelitian pendahuluan dan penelitian utama. Penelitian pendahuluan digunakan untuk menentukan perlakuan pada penelitian utama. Tiga jenis siste Artemia sp. digunakan pada penelitian pendahuluan, yaitu jenis San Fransisco Bay, Great Salt Lake dan Cina. Sedangkan pada penelitian utama hanya digunakan 2 jenis siste, yaitu jenis San Fransisco Bay dan Great Salt Lake. Siste ditetaskan pada wadah botol transparan yang bagian dasarnya dilubangi kemudian diletakkan dengan роsisi terbalik (mulut botol berada dibagian bawah). Wadah tersebut diisi air sebanyak 600 ml dan siste yang ditetaskan pada setiap botol sebanyak 0,5 gram (lebih kurang 150.000 butir). Dari bagian dasar wadah tersebut diberikan aerasi dengan menggunakan aerator akuarium.
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Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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