Judul: Anatomi Daun Beberapa Spesies Anggota Araceae di Kampus IPB Dramaga, Bogor
Abstrak: Araceae merupakan salah satu famili terbesar dari kelompok Monokot sehingga mudah ditemui di berbagai belahan dunia, khususnya di negara beriklim tropis. Indonesia merupakan habitat bagi 36 genus Araceae. Penelitian ini bertujuan mempelajari karakteristik anatomi daun beberapa spesies Araceae yang ditemukan di sekitar Kampus IPB Dramaga, Bogor. Dua helai daun diambil dari tiap individu pada tiga ulangan tanaman Aglaonema commutatum, Philodendron burle-marxii, Spathiphyllum wallisii, Syngonium auritum, dan Xanthosoma sagittifolium. Daun tersebut dibuat sediaan mikroskopis berupa sayatan paradermal. Karakter anatomi yang diamati ialah bentuk sel epidermis, tipe, ukuran, kerapatan, dan indeks stomata. Hasil pengamatan menunjukkan bahwa A. commutatum dan S. wallisii memiliki epidermis berbentuk poligonal dengan dinding antiklinal berlekuk, sedangkan P. burle-marxii, S. auritum, dan X. sagittifolium memiliki epidermis berbentuk poligonal dengan dinding antiklinal lurus. Daun bertipe hipostomatik hanya dimiliki oleh P. burle-marxii. Stomata brachyparacytic dijumpai di kedua sisi daun A. commutatum, S. wallisii, S. auritum, dan X. sagittifolium, sementara stomata brachyparahexacytic monopolar dijumpai di sisi abaksial P. burle-marxii dan S. auritum. Aglaonema commutatum merupakan spesies dengan stomata terbesar dan kerapatan stomata terendah. Syngonium auritum merupakan spesies dengan stomata terkecil dan kerapatan stomata tertinggi serta indeks stomata terendah. Spathiphyllum wallisii merupakan spesies dengan indeks stomata tertinggi.
Keyword: Araceae, brachyparacytic, brachyparahexacytic monopolar, epidermis, stomata

Judul: Keanekaragaman Famili Asteraceae di Kawasan Kampus IPB Darmaga, Bogar
Abstrak: Asteraceae is the second larger family after Leguminosae. The diversity of species in this family could be assessed by morphological and anatomical characters. This research aims to study the diversity of family Asteraceae in Campus Area of IPB Darmaga, Bogor by describing their morphological character and anatomical character of stomata and trichome. Sampling was conducted in 12 locations in the area of green space by using the methode of exploration. Type of stomata and trichome were observed using whole mount method. The family of Asteraceae were found as many as 26 species, belonging to 24 genera and 8 tribe. Tricomes of family Asteraceae are unicellular glandular trichome, multicellular glandular trichome, and multicellular non glandular trichome. The most often found trichome was multicellular non glandular trichome. The type of stomata of observed species are anomocytic
Keyword: Bogor Agricultural University (IPB), type of trichome., type of stomata, whole mount, exploration, Asteraceae

Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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