Judul: Tungau Parasit Yang Menginfestasi Larva Aedes Spp. Dan Faktor-Faktor Ekologis Yang Menentukan Kelimpahannya Di Kabupaten Bogor
Abstrak: Demam Berdarah Dengue (DBD) menjadi salah satu penyakit endemis di Indonesia. Pengendalian DBD masih berfokus pada pengendalian Aedes spp. sebagai vektornya. Tungau parasit pada larva Aedes spp. memberikan alternatif baru dalam pengendalian Aedes spp. Pengetahuan tentang pengaruh faktor ekologis terhadap kelimpahan tungau digunakan sebagai langkah awal dalam landasan kerja dan strategi pengendalian Aedes spp. Penelitian ini bertujuan untuk mengidentifikasi tungau parasit yang menginfestasi larva Aedes spp. dan menentukan faktor-faktor ekologis yang memengaruhi kelimpahan tungau parasit larva Aedes spp. di Kabupaten Bogor. Pengambilan larva Aedes spp. sebanyak 2,260 individu dan dilakukan secara langsung pada kontainer yang ditemukan di dalam dan luar rumah. Lokasi pengambilan larva Aedes spp. tersebar pada Kelurahan Cibinong, Cirimekar, Ciriung dan Pabuaran yang merupakan daerah endemis DBD di Kabupaten Bogor. Pengambilan tungau dilakukan menggunakan insect forceps di bawah mikroskop. Pengaruh faktor ekologis dianalisis menggunakan analis korelasi dengan tingkat kesalahan sampai dengan 20% (α = 0.20). Hasil deskripsi morfologi ditemukan sejumlah tungau yaitu Halacarus sp. (Prostigmata: Halacaridae), Histiostoma sp. (Astigmata: Histiostomatidae), dan Hydrozetes sp. (Oribatida: Hydrozetidae). Hydrozetes sp. mempunyai kelimpahan nisbi tertinggi yaitu 91.25%, Histiostoma sp. mempunyai kelimpahan nisbi sebesar 5% dan Halacarus sp. sebesar 3.75%. Hasil analisis korelasi menunjukkan bahwa faktor suhu (P = 0.121; R = 0.175) dan Total Dissolved Solid (TDS) (P = 0.010; R = 0.287) menentukan kelimpahan tungau dengan hubungan yang sedang dan lemah. Sebaliknya, baik Dissolved Oxygen (DO) (P = 0.366), pH (P = 0.856) dan bahan dasar kontainer (P = 0.28) tidak menentukan kelimpahan tungau parasit pada larva Aedes spp.
Keyword: Aedes spp., Halacarus sp., Histiostoma sp., Hydrozetes sp., tungau parasit

Judul: Dinamika Populasi Larva Nyamuk Aedes spp. di Kelurahan Bantarjati Kota Bogor
Abstrak: Dengue hemorrhagic fever (DHF) is caused by dengue virus. The virus is transmitted to humans through the bites of Aedes aegypti and Ae. albopictus as the primary vector dengue. The aim of this research to observed population dynamics of Aedes spp. mosquito larval related to rainfall index correlated breteau index (BI). This research was conducted in April until July 2012 in DHF endemic area Bantarjati Subdistrict Bogor City. The larval collected in containers indoor and outdoor were 396 containers from 200 households. The result showed that the density of larval population in Bantarjati Subdistrict were belonged to the moderate category according to density figure (DF) in the rate of 2−5 (WHO 1972). Ae. aegypti larval were also found in indoor containers (8.81%) and Ae. albopictus in outdoor containers (34.33%). The BI average was the best indicator to describe the density of larval population. In this research, BI average was significantly correlated (p<0.05) to the rainfall index of Bogor during April−July 2012.
Keyword: Mosquito larvae, Dengue hemorrhagic fever (DHF), Aedes albopictus, Aedes aegypti

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.
Keyword: