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: Dampak Pengembangan Pariwisata terhadap Tingkat Kesejahteraan dan Sosial Budaya Masyarakat Lokal
Abstrak: Development of tourism will impact people living in the areas of tourism itself. One of the tourism in Indonesia is Taman Safari Indonesia (TSI). This study intend to analyze the impact of the development of tourism to the socio-cultural and welfare levels as well as analyzing the relation of welfare level with the attitude towards Taman Safari Indonesia's existence. This study was conducted in Cibeureum village using survey methods with qualitative and quantitative approach. The result showed that Taman Safari Indonesia impacts on sociocultural that include the change of the lifestyle, cultural values, power and authority of the informal leaders, and social cohesion. While the impact on the welfare level that include the increasing of the income, health access, education access, and the property right. Result of the study also show the relation between welfare level with attitude towards the existence of Taman Safari Indonesia.
Keyword: welfare, Socio-cultural, Tourism, Taman Safari Indonesia, Attitude, Bogor Agricultural University (IPB)

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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