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 Kasus Kriptosporidiosis pada Sapi Potong di Kecamatan Ujung Jaya, Sumedang, Jawa Barat
Abstrak: Cryptosporidiosis is a zoonoses caused by Cryptosporidiumspecies. This research were aim to study and identification the prevalence of C. parvum in cattle on Ujung Jaya Regency, Sumedang, West Java. This research studied 60 fecal specimens, consisted of 10 calves, 9 heifers, and 41 adult cattles. And based on gender, consisted of 46 cows and 14 bulls. Samples were examined by floating sheater sugar and microscopic examination. The prevalence of Cryptosporidiosis on Ujung Jaya Regency was 11.67%. Based on statictical analysis, age and gender could not increase the prevalence of Cryptosporidiosis significantly (P>0.05). And based on the descriptive analysis the prevalence of Cryptosporidiosis in bulls (14.29%) higher than in cows (10.87%), and for adult cows (7.32%) is lower than neonate calf (20%) and calf (22.22%).
Keyword: Bogor Agricultural University, Cryptosporidiosis, prevalence, cattle, Ujung Jaya  Sumedang

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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