Judul: Efikasi Sipermetrin Terhadap Larva Caplak Anjing (Rhipicephalus sanguineus
Abstrak: The usage of dogs among the people of Indonesia is currently increasing. Usually, dogs are used as playmate, guard and police partner. Ectoparasite that often cause problem in dog was Rhipicephalus sanguineus ticks. Cypermethrin insecticide is a chemical that can be used to control of ticks on dogs. Ticks larvae were divided into 4 treatment groups and one control group. Each group was divided into 3 repititions with the number of ticks larvae were 20 per repeated. The concentration for each treatment group were 0.5 g/L, 1 g/L; 1.5 g/L, 2 g/L, and a control group using water. Fabric drabbled with different concentrations of cypermethrin were prepared and the ticks larvae were put on it. Observation on larval mortality was done on 1, 2, 3, 4, 5, 6, 12, 24, and 48 hours post treatments. The result showed that the effective concentration of cypermethrin was 2 g/L, because this concentration was able to kill 93.33% of tick larvae at 24 hours post treatment.
Keyword: Rhipicephalus sanguineus, larvae, insecticide, ectoparasites, Cypermethrin

Judul: Efikasi Obat Berbahan Aktif Sarolaner terhadap Caplak Rhipicephalus sanguineus (Arachnida: Ixodidae) yang Menginfestasi Anjing.
Abstrak: Rhipicephalus sanguineus merupakan caplak yang umum ditemukan pada anjing. Serangan R. sanguineus yang tinggi pada anjing disebabkan karena setiap siklus hidup caplak ini memerlukan anjing sebagai inang utama. R. sanguineus selain mengisap darah, juga berperan sebagai vektor yang mentransmisikan babesiosis, hepatozoonosis dan ehrlichiosis pada anjing. Saat ini telah dikembangkan obat anticaplak berbahan aktif sarolaner dalam sediaan tablet kunyah untuk hewan kesayangan. Tujuan penelitian ini adalah menganalisis efektivitas tablet anticaplak sarolaner terhadap infestasi caplak R. sanguineus pada anjing. Sebanyak 10 ekor anjing yang terinfestasi caplak dibagi menjadi 2 kelompok yaitu kelompok kontrol (2 ekor anjing) dan kelompok perlakuan (8 ekor anjing). Kelompok perlakuan diberikan tablet sarolaner per oral sekali pemberian dengan dosis 2 mg/kg berat badan. Pengamatan terhadap penurunan jumlah caplak dilakukan selama 30 hari pasca pemberian obat. Pengamatan pada H1 (sehari pasca perlakuan) menunjukkan persentase reduksi jumlah caplak sebesar 75,62%. H21 dan H30 merupakan tingkat tertinggi efikasi dengan persentase reduksi jumlah caplak sebesar 99,53%. Sarolaner efektif sebagai anticaplak selama 30 hari, yang terlihat dari adanya penurunan jumlah caplak pada kelompok anjing perlakuan lebih dari 90%.
Keyword: Rhipicephalus sanguineus, tick, dogs, sarolaner

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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