Judul: Pengaruh Suplementasi Mineral Zn dan Vitamin E terhadap Performa ayam Kampung (Gallus domesticus)
Abstrak: Zink and vitamin E plays an active role in the metabolism and protect blood cells whose function is to transport nutrients. The objective of this study was to evaluase the effect of Zn and vitamin E suplementation on performances of kampong chicken (Gallus domesticus) and the length of the shank. One hundred and sixty kampong chickens were used in this experiment and reared from 8 up to 10 weeks of age. The data analyzed with a Completely Randomized Design using 5 treatment diets and 4 replications, with 10 birds in each replicate. The experimental diets were : R1 ( control diet, without mineral Zn and vitamin E), R2 ( R1 + Zn 200ppm ), R3 ( R1+ vitamin E 200IU ), and R4 ( R1 + Zn 200ppm and vitamin E 200IU ). Parameter observed were feed intake, the final body weight, body weight gain, feed conversion, mortality, lenght of the shank.The results showed that Zn and vitamin E suplementation did not affect the performances of kampung chicken. There was no mortality due to treatments during the study. Mineral Zn and Vitamin E in the diets were already meet the requirement of kampong chicken
Keyword: vitamin E., performances, mineral Zn, kampong chicken

Judul: Pengaruh Fortifikasi Vitamin E dan Zink dalam Ransum terhadap Performa Ayam Petelur.
Abstrak: Indonesia as a tropical country with high ambient temperature and relatively humidity cause heat stress-related decreases in laying hen performance. Enrichment of antioxidants in the diet can reduce the negative effect of heat stress. The purpose of this study was to determine the effects of fortification vitamin E, zinc organic, and its combination as antioxidants in commercial diets on the performance of ISA-Brown laying hens. This study used 160 laying hens aged 20-25 weeks. The experimental design used in this research was completely randomized design (CRD) with 4 treatments, 4 replications of 10 birds of each. The birds were fed either a control diet (R0) or a control diet fortified with vitamin E 200 ppm (R1), zinc organic 200 ppm (R2), or a combination of vitamin E 200 ppm and zinc organic 200 ppm (R3). The results showed that fortification of vitamin E and zinc organic or its combination increased hen day production, egg mass production and feed conversion. Feed consumption of hens fed with vitamin E and vitamin E plus zinc organic was higher (P<0.05) than that of the control. Egg weight remained similar in all treatments. Combination of fortification dietary vitamin E 200 ppm and zinc organic 200 ppm resulted the best performance of laying hen.
Keyword: 

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.
Keyword: