Judul: Toxocarosis pada Sapi Potong Peternakan Rakyat di Kecamatan Ujung Jaya, Sumedang
Abstrak: The study was carried out to investigate the prevalence, intensity of infection, and the related risk factors of toxocarosis in cattle of Ujung Jaya Subdistrict, Sumedang. The number of 108 fecal samples were collected and examined by modified McMaster method to determine the number of Toxocara eggs per gram (EPG). The potential of risk factor regarding to sex, age, and livestock management were obtained by interviewing the farmer. The result showed that of the total 108 fecal samples, 11 samples were positive to toxocarosis with prevalence of 10.18%. The mean number of eggs per gram fecal in infected cattle was 7 005.5 ± 3 534.4. The highest prevalence was observed in calf ≤ 6 month of age group only (42.31%) and was more prevalence in male (32.14%) than female (2.50%) (P<0.05). The prevalence of toxocarosis among different husbandary practices of cages management, feeding, sanitary, and anthelmintic was not significant (P>0.05).
Keyword: Ujung Jaya, toxocarosis, Sumedang, risk factor, prevalence

Judul: Kajian Penyakit Parasit Darah pada Sapi Potong Peternakan Rakyat di Kecamatan Ujungjaya, Kabupaten Sumedang, Jawa Barat
Abstrak: The purpose of this study was to determine the prevalence, risk factor and parasitemia blood parasite based on age and sex category on cattle in Ujungjaya sub-district, Sumedang regency, West Java. Blood samples were collected from 139 cattle in July 2012. Thin blood smears were made on glass slide, fixed in methanol, stained with Giemsa 10% and observed using a microscope with 1000x magnifications. The amount of intraerythrocytic parasite counted for every 500 red blood cells. The potential of risk factor in regard with age, sex, ways to raise, flies and tick control were analyzed with chi-square. The result showed that the highest prevalence was observed in Anaplasma sp. (38.8%), followed by Babesia sp. (33.8%), and Theileria sp. (22.3%). The prevalence of babesiosis and anaplasmosis are influenced by age and ways to raise (p<0.05), while theileriosis had not significantly different. Sex did not affect the level of prevalence. The prevalence of babesiosis is influenced by flies and tick control (p<0.05), while anaplasmosis and theileriosis did not differ significantly. In general, the level of parasitemia increased along with increasing by age. The parasitemia of babesiosis in cow had differently with bull (p<0.05), while anaplasmosis and theileriosis had not significantly different. Percentage parasitemia at various age and sex have the same value that is <1%, which is relatively mild levels of parasitemia.
Keyword: Ujungjaya, risk factor, prevalence, level of parasitemia, intraerythrocytic parasite

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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