Judul: Keanekaragaman lumut sejati di Taman Nasional Gunung Merapi Sleman, Yogyakarta
Abstrak: Mosses are a group of non-vascular plants. It accurs abundantly in tropical rain forest. Substrate type and the availability of substrate are important in affecting the diversity of mosses. Eruption of Merapi volcano Oktober 2010 have a great demages on the vegetation of Mount Merapi National Park. Many trees are burned and uprooted. The understory were covered by volcanic material. Mosses might have important roles in the secondary succession followed the vulcano eruption.This research aimed to record and describe the diversity of the mosses species in the secondary succession at the vegetation of the national park and to make identification key of the mosses. Samples were collected in three sites area sixteen month after the eruption in 2010, namely Pronojiwo, Gandok, and Kinahrejo. Purposive sampling method was used to record the diversity of mosses. In addition, quadratic sampling method was used to determine the dominant mosses in the successional process. Identified mosses were listed into a list. Total of 41 species of acrocarp and 4 species of pleurocarp mosses were found in the sites. Mosses diversity in Kinahrejo are quite similar to Gandok but it was different with Pronojiwo. Most mosses were found on terrestrial substrate, that are soil, sand, and rock. Trematodon conformis is a dominant pioneer mosses in the successional process of the national park.
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Judul: Keanekaragaman lumut hati dan lumut tanduk pasca erupsi di taman nasional gunung merapi, yogyakarta
Abstrak: Merapi is an active volcano, its latest eruption was occurred in October 2010. Merapi Mountain National Park Yogyakarta, characterized by tropical rain forest and located at the southern slopes of the vulcano. The eruption in October 2010 spreaded hot cloud and caused forest fires that damaged most of the vegetation where the bryophytes inhabit. This study aims to describe species diversity and construct identification key of the bryophytes, especially the liverworts and hornworts, of the national park post-eruption of Merapi. Sampling was conducted sixteen months after the latest eruption at three locations; Pronojiwo Hill, Kinahrejo, and Gandok. Purposive sampling method was applied to obtain samples of the bryophytes. A total of 20 bryophytes species representing fourteen genera and eight families, were found in the study. Those species consist of twelve leafy liverworts, five thalloid liverworts, and three hornworts. Arboreal bryophytes were only found in the Pronojiwo Hill, they were leafy liverworts. Terrestrial bryophytes occurred in all study areas. The liverworts and hornworts diversity in Pronojiwo Hill where trees still exist was higher than that in Kinahrejo and Gandok where the trees absence. Thalloid liverworts Marchantia treubii was common in the Merapi Mountain National Park.
Keyword: bryophyte, liverworts, hornworts, Merapi Mountain, posteruption.

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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