Judul: Kualitas Gerakan Rolling Kapal Model Katamaran dan Monohull.
Abstrak: Bentuk kapal antara katamaran dan monohull akan berpengaruh pada kemampuan kapal dalam meredam gerakan rolling. Kualitas kapal dalam meredam gerakan rolling merupakan salah satu faktor yang dapat digunakan untuk menilai kemampuan stabilitas sebuah kapal. Semakin singkat periode rolling maka stabilitas kapal semakin baik dan sebaliknya. Tujuan penelitian ini adalah mendapatkan dan membandingkan setiap nilai parameter gerakan rolling kapal model katamaran dan monohull. Metode penelitian ini dilakukan dengan mengamati gerakan rolling kapal model katamaran dan monohull yang memiliki dimensi utama sama (LOA = 46 cm; LWL = 42,3 cm; B = 30,8 cm; D = 11cm; d = 5,2 cm). Berdasarkan hasil penelitian dapat disimpulkan bahwa kapal model katamaran memiliki kualitas gerakan rolling yang lebih baik daripada kapal model monohull ditinjau dari sudut oleng, rolling duration, jumlah rolling hingga kapal stabil, rolling period dan rolling frequency.
Keyword: gerakan rolling, katamaran, monohull, stabilitas

Judul: Rasio antara Panjang Bilge Keel dengan Lenght of Waterline dalam Meredam Gerakan Rolling Kapal Model.
Abstrak: Fishing vessels must have a good stability and maneuverability. The hull with round bottom shape have a relatively poor rolling duration than the other forms. Damping rolling duration that will improve the quality of stability on the ship can be done by the installation of the bilge keel. The objectives of this research are: (1) Compare each parameter value of rolling ship model that uses bilge keel; (2) Determine the ratio of the minimum length of bilge keel to the length of waterline ship models to have a better ability in reducing rolling ship. Experimental method was applied in this research by giving a treatment on the model of fishing vessel and observe the movement of rolling with some different length of bilge keel. Based on the result, it can be concluded that installation of bilge keel with some length ratio of the length of waterline have a different result signifikan, and bilge keel with the length ratio to the length of waterline at 0,2, still has a better ability in reducing rolling motion ship models.
Keyword: bilge keel, rolling motion, round bottom, stability

Judul: Lejeuneaceae Subfamily Ptychanthoideae (Hepaticae) in  West Java
Abstrak: Subfamily Ptychanthoideae of the family Lejeuneaceae (Hepaticae) in West Java is still poorly known. Publications on this subfamily are out of dated and written in the 19th or early of 20th century. The last taxonomic treatment of Ptychanthoideae of West Java was in 1933, many species names have changed since then. Studies on Ptychanthoideae of West Java are urgently needed. Studies on the Ptychanthoideae were based on the specimens collected from West Java. A total number of 361 of specimens deposited in the Herbarium Bogoriense (BO), Herbarium Biotrop (BIOT), Gottingen Herbarium (GOET) and Bangi Herbarium (UKMB) were examined, those are old and several recent specimens collected in West Java. Recent collections were made from Telaga Warna, Ciater, Gunung Halimun Salak National Park, Cibodas Botanical Garden, Bodogol Education Center and Conservation (Gunung Gede Pangrango National Park), University of Indonesia Campus Depok, including several collections from Banten Province. Twenty four species of Lejeuneaceae subfamily Ptychanthoideae are known from West Java, belonging to 8 genera namely Acrolejeunea (Spruce) Schiffn. (2 species), Archilejeunea (Spruce) Schiffn. (1 species), Lopholejeunea (Spruce) Schiffn. (10 species), Mastigolejeunea (Spruce) Schiffn. (3 species), Ptychanthus Nees (1 species), Schiffneriolejeunea Verd. (1 species), Spruceanthus Verd. (2 species) and Thysananthus Lindenb. (4 species). Two new records of Ptychanthoideae: Mastigolejeunea indica Steph. and Thysananthus minor Verdoorn are reported for Java. A determination key to the species is presented including their descriptions and illustrations.
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