Judul: Experience and the Impact of Voluntourism at Samboja Lestari Orangutan Rehabilitation Center
Abstrak: Voluntourism is a form of alternative tourism that growing rapidly in recent years, mixing voluntary works and tourism activity in developing countries, including Indonesia. Borneo Orangutan Survival Foundation (BOSF), alongside with The Great Project (TGP) are organizations that managed this program. The objective of the research was to analyze how program implemented, identify voluntourists‟ characteristics, motives, perceptions, and satisfactions towards the program, also the impact of the voluntourism program. The research was conducted in Samboja Lestari Orangutan Rehabilitation Center on June 1 –July 23 2018 through questionnaires, interview, and field observation. Voluntourist activities were mainly prepares food (for orangutan and sunbear) and enrichment on weekdays, tourism activity on weekends. The biggest groups of voluntourist were female, UK nationality, youth and late adult age class, and working on finance. Environment aspect was the main motivation and benefit for voluntourists, while staff quality and supervision were aspect that received best perception and satisfaction from voluntourists. Various impacts from voluntourism program were received local staff, BOSF, TGP, orangutan and sunbear.
Keyword: experience, impact, Samboja Lestari, voluntourism

Judul: Nilai Manfaat Ekonomi Dan Dampak yang Ditimbulkan Wisata Alam Terhadap Perilaku Orang utan di Pusat Rehabilitasi Orangutan Bohorok
Abstrak: Banyaknya orangutan yang dipelihara atau yang diperjualbelikan oleh masyarakat di daerah Aceh dan Sumatcra Utara mendorong dibentuknya Pusat Rehabilitasi Orangutan Bohorok. Pembukaan Pusat Rehabilitasi Orangutan untuk pengunjung tclalt menaikkan perritintaan wisata alam ke Bukit Lawaog. Banyaknya pcngunjung tidak menjadi jaminan semakin banyaknya masukan dana bagi pengelola pusat Rchabilitasi 0rang utan. namun semakin banyaknya pengunjung menyebabkan orang utan semakin terbiasa dengan kehadiran pengunjung sehingga proses peliaran kembali orangutan rehabilitasi akan semakin lambat dan orang utan liar akan ikut terkontaminasi keadaan sedemikian sehingga pola aktivitas hariannya ikut berubah
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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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