Judul: Diversity of tree species as sun bear food in conservation area of PT. RAPP Meranti Estate, Riau
Abstrak: Beruang madu termasuk salah satu spesies langka yang ada di Sumatera dan Kalimantan. Areal konservasi PT. RAPP Estate Meranti merupakan habitat beruang madu di Riau, Sumatera. Informasi keanekaragaman jenis pohon pakan beruang madu di areal konservasi PT. RAPP Estate Meranti sampai saat ini belum tersedia. Informasi tersebut dapat dijadikan acuan pengelolaan habitat beruang madu untuk mencegah kurangnya ketersediaan pakan beruang madu.
Keyword: conservation area, distribution pattern, environment factor, tree species as sun bear food

Judul: Population Size and Spatial Distribution of Activity Tracks of Sun Bears (Helarctos malayanus, Raffles 1821) at the PBPH Area of PT Telaga Mas Kalimantan
Abstrak: Informasi tentang ukuran populasi dan sebaran yang menentukan keberadaan beruang madu diperlukan oleh PT. TMK sebagai salah satu bahan pertimbangan dalam merumuskan strategi konservasi keanekaragaman hayati khususnya beruang madu. Penelitian ini bertujuan untuk mengidentifikasi ukuran populasi dan sebaran spasial jejak aktivitas beruang madu serta hubungannya dengan karakteristik habitat di areal kawasan. Data dikumpulkan menggunakan metode album melalui camera trap, pengamatan jejak aktivitas dengan transek jalur dan analisis vegetasi. Data dianalisis ukuran populasi dengan menentukan jumlah individu yang teridentifikasi, menentukan sebaran jejak aktivitas secara spasial untuk menentukan pola sebaran, serta uji chi-square untuk menentukan hubungan antara sebaran jejak aktivitas beruang madu dengan karakteristik habitat. Berdasarkan hasil camera trap ukuran populasi didapatkan enam individu beruang madu dengan data persebaran 27 jejak aktivitas yang meliputi 26 cakaran dan satu bongkahan, tersebar secara mengelompok yang dipengaruhi oleh jarak dari sumber air dan kerapatan vegetasi pada tingkat pertumbuhan tiang., Information on population size and distribution that determine the presence of sun bears is needed by PT TMK as one of the considerations in formulating biodiversity conservation strategies, especially sun bears.. This study aims to identify the population size and spatial distribution of sun bear activity tracks and their relationship with habitat characteristics in the area. Data were collected using the album method through camera traps, observation of activity tracks with transect lines and vegetation analysis. Data were analyzed for population size by determining the number of individuals identified, determining the distribution of activity traces by spatial and morisita index, and chi-square test to determine the relationship between the distribution of sun bear activity traces and habitat characteristics. Based on the results of the camera trap population size, six sun bears were found with distribution data of 27 activity traces including 26 scratches and one chunk, scattered in groups influenced by distance from water sources and vegetation density at the pole growth level.
Keyword: Activity trace, habitat characteristics,, population size, spatial distribution, sun bear

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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