Judul: Keanekaragaman Herpetofauna di Areal PT Indocement Tunggal Prakarsa, Tbk Plant Palimanan Cirebon Jawa Barat
Abstrak: PT. Indocement Tbk Cirebon is one of the centre of cement production in Java. The mining activities will affect on the condition of habitats in this area. The purpose of this study is to assess herpetofauna composition and diversity. Data was collected on July 2013 in six sampling locations using VES (Visual Encounter Survey) – time search. There are 22 species with total 161 individuals herpetofauna consisting of 9 species of amphibians and 13 species of reptiles. The highest number of diversity index (Shannon Wiener index) found in Tegakan samping gudang batu bara, Kolam Goa Dalam and Hutan Alam Gunung Blindis, while the lowest number found in Curug Hanjuang. Three sampling points should be prioritize for conservation which are Tegakan samping gudang batu bara, Hulu Sungai Kali Jaya and Curug Hanjuang.
Keyword: habitat, diversity, herpetofauna

Judul: Keanekaragaman Jenis Burung di Areal PT Indocement Tunggal Prakarsa Tbk. Pabrik Palimanan
Abstrak: The bird species diversity in the location of PT Indocement Tunggal Prakarsa (ITP) Tbk, can be indicators of the successfully of the PT ITP in relative maintains of the environment. The research was conducted on 8 land cover types in the PT ITP. Bird data was collected using Point Count with the number of points at each location between four to six points, with the distance of each point with observation radius of 150 m and 50 m. Total bird species found at the sampling area is 46 species (25 families). Eight species of birds in the location in the list of protection according to the GR No. 7 in 1999 and two bird species included in Appendix II of CITES. Highest bird diversity index is the location of the Jatropha curcas (H'= 2.98). Evenness index in all types of land cover almost evenly spread of at the sampling area. T-test results showed that wetland, is a significantly different land cover types with trees land cover, plant area, Jatropha curcas, and shrubs. Artificial lake area significantly different with trees land cover, plant area, Jatropha curcas, and shrubs. Another significantly different is buffer areas with trees land cover. Locations with similarity index types (IS) is the highest among plant area with Jatropha curcas (IS= 0.77). The dominance bird species at sampling area was influence by land cover type.
Keyword: Palimanan, Indocement, diversity, bird

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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