Judul: Studi Recruitment Karang dan Organisme Bentik pada Artificial Biorock, Pulau Pramuka-DKI Jakarta
Abstrak: Coral recruitment is a process where juvenile coral, generated through reproduction, attached to substrates and grow to become part of coral populations. Mineral accretion defined as a process of formation of solid minerals and is one method for forming artificial reefs by using the principle of calcification, this method is known as biorock. Biorock expected to be a substrate for coral larvae settlement, so it can be used as one of the innovations of rehabilitation of coral reefs that were damaged. Observation of coral and other benthic organism recruitment were carried out once in a month during April to October 2010. In general algal and ascidians dominated unit with biorock treatment at the first month of observation. At the end of observation, we found ten coral genera from six families at biorock. We observed an increase of coral genera as much as three fold during T0-T6; Pavona, Millepora and Stylophora. However coral species increment did not occur in non-biorock treatment, there were only six genera and three families observed through out the study period. The highest coral recruitment density was found at biorock treatment (45 colonies/unit) compare to non biorock (33 colony/unit).
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Judul: Struktur dan Pertumbuhan Karang Rekrutmen Pada Terumbu Buatan Modul Beton di Pulau Harapan, Kepulauan Seribu, DKI Jakarta
Abstrak: Coral reefs are a renewable resource that has the important function of Ecology, socio-economic, and culture. In Indonesia, the damage to the coral reef ecosystem is largely due to human activities. To speed up the recovery of coral reefs, several methods of rehabilisationare used such as transplantation and artificial reefs. The purpose of this study was (1) to know the growth rate of coral attached (recruitment) on concrete artificial reef modules, and (2) to determine the structure of coral communities on artificial reefs over a period of 1 year. In this study measured the growth of coral recruitment covering the length and width, survival rates, and recruitment of coral community structure. Types of coral recruitment was dominated by Pocillopora, Millepora and Acropora with a total of 59 species of 65 species of coral recruitment found. Growth in average length was highest in the range of months from January-May 2011 were 0.76±1.98 cm, and the width of the growth of the highest average in the range of months from May-July 2011 were 1.18±0.92 cm.
Keyword: reef community structure, coral recruitment, coral growth, artificial reefs

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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