Judul: Kajian Kasus Kriptosporidiosis Pada Sapi Potong Di Kecamatan Ujung Jaya, Sumedang, Jawa Barat
Abstrak: Kriptosporidiosis merupakan zoonosisyang disebabkan oleh protozoa spesiesCryptosporidium.Penelitian ini bertujuan untuk mengkaji dan mengidentifikasi tingkat prevalensi infeksi C. parvum pada sapi potong di peternakan rakyat pada wilayah Kecamatan Ujung Jaya, Kabupaten Sumedang, Provinsi Jawa Barat. Penelitian ini memeriksa sampel feses sapi sebanyak 60 sampel dari 35 peternak. Berdasarkan umur ternak, 60 sampel tersebut terdiri atas 10 pedet, 9 sapi anakan, dan 41 sapi dewasa. Dan berdasarkan jenis kelamin, 60 sampel tersebut terdiri atas 46 sapi betina, dan 14 sapi jantan. Sampel diuji dengan metode pengapungan gula sheaterdan diamati di bawah mikroskop. Prevalensi Kriptosporidiosis di Kecamatan Ujung Jaya masih dalam kategori rendah (11.67%). Melalui analisis statistik didapat hasil bahwa umur dan jenis kelamin tidak meningkatkan prevalensi Kriptosporidiosis secara signifikan (P>0.05) baik pada pedet, anakan, atau sapi dewasa. Berdasarkan hasil deskriptif, prevalensi Kriptosporidiosis lebih tinggi pada sapi jantan (14.29%) daripada sapi betina (10.87%), juga pada sapi dewasa (7.32%) lebih rendah dari pada pedet (20%) dan sapi anakan (22.22%)
Keyword: Kriptosporidiosis, prevalensi, sapi potong, Ujung Jaya, Sumedang

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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