Judul: Prevalensi Kasus Kriptosporidiosis pada Sapi Potong di Kecamatan Cipatujah dan Cikalong, Tasikmalaya, Jawa Barat
Abstrak: Cryptosporidiosis is caused by Cryptosporidium sp. often occurs in cattle. This research aimed to determine the prevalence of Cryptosporidium sp infection in cattle at Cipatujah and Cikalong regency, Tasikmalaya, West Java. The research started in October 2012 to June 2013 used fecal specimens from 203 cattles of 117 farmers. Based on gender, sample consisted of 168 cows and 35 bulls. Based on age, consisted of 151 adult cattles, 24 heifers and 28 calves. Sample of feces were examined by floating sheather sugar, then afterwards observed using a light microscope. Percentage prevalence of Cryptosporidium sp at Cipatujah regency (13.08%) was higher than at Cikalong regency (8.33%). The infection of Cryptosporidium sp was higher in calves and heifers than adult cattles. The result of statistical tests shows the prevalence of cryptosporidiosis infection based on gender at Cipatujah regency is significant difference (P<0.05), but based on age at Cipatujah and Cikalong regency are no significant difference (P>0.05).
Keyword: prevalence, gender, Cryptosporidium sp, cattle, age

Judul: Prevalensi infeksi Cryptosporidium sp pada sapi potong di Kecamatan Cijulang dan Cimerak, Ciamis, Jawa Barat
Abstrak: Cryptosporidium sp is a parasite causes cryptosporidiosis in cattle. Cryptosporidiosis can be transmitted from animals to humans and vice versa (zoonosis). This research aimed to determine the prevalence of Cryptosporidium sp infection in cattle at Cijulang and Cimerak regency, Ciamis, West Java. Fecal specimens from 145 cattles of 77 farmers, consisted of 20 calves, 33 heifers and 92 adult cattles. Based on gender, the sample was consisted of 127 cows and 18 bulls. Sample of feces were examined by floating Sheather sugar and acid-fast staining method. Percentage prevalence of Cryptosporidium sp in Cimerak area (43.18%) was higher than in Cijulang area (14.29%). The result of statistical tests shows the prevalence of Cryptosporidium sp infection based on age and gender is no significant difference (P>0.05). However, based on the results of descriptive, prevalence infection of Cryptosporidium sp in cows (33.1%) was higher than in bulls (23%).
Keyword: Cryptosporidium sp, prevalence, cattle, age, gender.

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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