Judul: Kontribusi Adopsi Sarang Burung terhadap Karakteristik Ekologi dan Sosial Ekonomi Desa Jatimulyo Kabupaten Kulon Progo
Abstrak: The Bird's Nest Adoption Program (PAS) is an activity carried out to increase the value of the benefits of forest management and its sustainability. The development of this concept will be an excellent opportunity for environmental conservation and increasing the economic value of community-owned land from the non-timber sector. However, the community does not know how much its contribution is to the ecological and socio-economic aspects. This study aims to analyze the ecological characteristics of vegetation and birds, describe the contribution of PAS to the social community, calculate the economic contribution of the PAS community in Jatimulyo Village, and formulate a strategy for managing PAS by KTH Wanapaksi in a sustainable manner. The relative abundance and diversity of birds were measured using the encounter rate method. Habitat assessment through an inventory to obtain the type and diversity of vegetation. The social contribution was measured based on knowledge, perception, participation, and community behavior using a Likert scale and unpaired t-test. The method used to measure the economic contribution is to share and covering household income and expenditure. The PAS management strategy is formulated using a SWOT analysis involving expert respondents. The results showed that the PAS location had a higher number of bird species, namely 46 species, while at the non-PAS location, there were 40 species out of a total of 52 bird species in all locations. The brown-throated sunbird species at the study site had the highest relative abundance of birds (Anthreptes malacensis). The bird diversity index at the adoption location was 3.0146, while the non-PAS location was 2.9885. The community's knowledge, participation, and behavior from the presence of PAS showed significant differences between PAS and non-PAS locations even though the perception showed the same results. In the community's economic contribution, the community's share of income from PAS is 0.811 %, while covering the public expenditure is 1.058 %. Based on the SWOT method used, the results of the SWOT matrix calculation show that the most appropriate strategy is in quadrant I (0.89; 0.64). The quadrant states that the strategy used is S-O (strength opportunity). Strategy means that the existing opportunities are grabbed by using their strengths
Keyword: Bird nest adoption, Community, Contribution, Ecology, Strategy

Judul: Keanekaragaman Jenis Burung pada Beberapa Cluster Perumahan di Sentul City, Bogor Jawa Barat
Abstrak: Sentul City held the eco-city concept and has a unique landscape with a variety of topography. This area has a variety of vegetation structure and composition which are distributed in several residential clusters. One of the biodiversity that can be found in this area is bird. Variety of habitat types will influence the bird diversity in each area (Blendinger and Ricardo 2001). The objective of this research were (1) to describe the habitat of birds, (2) to examine bird diversity, (3) to compare the bird composition among cluster types, (4) to examine vertical and horizontal distributions of birds in several vegetation and tree architecture, (5) to examine the influence of tree architecture on tree utilization by bird. The research was conducted in Sentul City from June to September 2011, in the area of research are five residential cluster which are selected by the age of cluster and composition of vegetation, and one location is a boulevard. The habitat condition and vegetation (dominant vegetation, tree height, type of tree architecture, vertical and architecture utilized side) are described with qualitative data and collected by direct survey. Bird data is collected by MacKinnon species list method (MacKinnon et al. 1998) with 10 species of birds each list. Bird diversity analyzed by using species area curve, meet frequence and index of similarity. Utilization of vegetation using descriptive analysis. A total of 42 species of bird from 24 families were recorded in this research. There were 6 species cannot find and 25 new species recorded compare by the result of AMDAL Bukit Sentul at 2000. The highest bird diversity found in Northridge cluster with 33 species of bird and the lowest bird diversity found in Venesia-Pasadena-Sakura cluster. Based on MacKinnon species list result, showed the leveled out of curve. It showed there was nothing increment of bird species at research location. Some of birds have a high number of meet frequence in one location, but cannot find in other location. It showed there was a low distribution of bird species. The highest similarity index was found between Bali cluster and Venesia-Pasadena-Sakura cluster (IS=0.76). In general, most of bird can be found at 2/3 of tree crown except in Argenia cluster. Midlde branching part of the tree crown are the most utilize part by bird. There are management method that can impelement, (1) provide and defence birds habitat, (2) planting a favourite vegetation for birds, (3) establish protected area for birds, (4) research on bird diversity in other locations, (5) intensively monitoring on bird diversity, (6) Sosialization in the importance of bird diversity, (7) develope an environmental education programs.
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: