Judul: Physiological Adaptation of Sand Ane mone (Heteractis malu) Towards Increasing Te mperature of The Water Environment for 1° C and 2° C
Abstrak: The phenomenon of coral bleaching is a very interesting topic to be studied. This is related to global warming, which is the cause of the phenomenon of coral bleaching in animals. Sand anemone is one of formers the coral reef ecosystem that has a symbiotic zooxanthellae and one of the hexacorallia like a coral. Anemones are given treatment of increased environmental temperature of 1o C (29o C) and 2o C (30o C) to assess the response to global temperature increases. The purpose of this research is to study the adaptation of sand anemone (Heteractis malu) towards improved the environmental temperature for 1o C and 2o C and in laboratory scale.
Keyword: 

Judul: Study Of Coral Bleaching to the State of Coral Reef and Reef Fish in Weh Island, Sabang
Abstrak: Sea surface temperature (SST) in Aceh waters had increased 4 oC which reach 33oC. This was the highest temperature recorded compared to the normal averages of 28-30 oC. The rise of SST had led to the death of coral reef. The peak of coral bleaching or bleaching index (BI) occurred on May 2010 which was 45.84 %. Meanwhile, it decreased on July 2010 and February 2011 which were (21,44 and 0,36%), respectively. The genera of Acropora and Pocillopora had a severe impact to the rise of SST which obviously led to the death. Both genera experienced 95% and 80% of bleaching on May 2011 and suffered severe death on July 2011. In addition, these genera were the most vulnerable to the coral bleaching phenomenon. However, there were some coral genera that can tolerate to the environmental changes, among them were Diplostrea and Montipora. The coral bleaching also affected the hard coral cover. In every observation points, the percentages of hard coral cover decreased by 10 to 25 %, The highest decrease percentages of hard coral cover occurred in Tourism regions where in 2009 hard coral cover decreased from 43,54 to 32,39% in 2011. This is because in this region, bleaching index (BI) reached the highest value of 77.07% than in Panglima Laot region and Free Zone which only reached 60.78% and 58.50%, respectively. The high levels of coral mortality resulted to the increasing of algal recruitment or raise percentages of Algal cover. The highest Algal cover found in Sumur Tiga and Ujung Seurawan. Both location showed the raise percentages of Algal cover in 2011 which were 20-35% (48,7% and 51,7%) than in 2009 (13,8% and 32,8%).
Keyword: 

Judul: Cycle Hamilton pada Graf Lengkap, Graf Regular, dan Graf 2-Connected 4-Regular Berorder Kurang dari Sepuluh
Abstrak: Suatu graf disebut graf Hamilton apabila graf tersebut memuat cycle Hamilton, yaitu cycle yang melewati setiap vertex tepat satu kali. Menentukan keberadaan cycle Hamilton pada suatu graf dapat menggunakan syarat cukup yang berupa teorema-teorema yang telah diperkenalkan sejak tahun 1950-an. Beberapa syarat cukup yang dibahas dalam karya ilmiah ini adalah syarat cukup yang berhubungan dengan graf lengkap dan graf regular. Suatu graf lengkap berorder 𝑛������ ≥ 3 dan graf r-regular berorder 𝑛������ ≤ 2𝑟������ + 1 merupakan graf Hamilton, Karena kedua graf tersebut memuat cycle Hamilton. Selanjutnya, syarat cukup tersebut digunakan untuk menentukan keberadaan cycle Hamilton pada graf 2-connected 4- regular berorder kurang dari 10.
Keyword: graf Hamilton, graf regular, graf lengkap, graf 2-connected 4-regular