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: Community-Based Bird Breeding Business in Karangtalun Hamlet, Wukirsari Village, Bantul, Special Region of Yogyakarta
Abstrak: Jumlah penangkar burung di Jawa Tengah dan Daerah Istimewa Yogyakarta tercatat sebesar 28,9% lebih banyak dibandingkan penangkaran satwa lainnya. Tujuan dari penelitian ini adalah menganalisis kondisi penangkaran burung di Dusun Karangtalun, menganalisis nilai ekonomi finansial dan kontribusi usaha penangkaran burung, serta menentukan alternatif upaya pengembangan usaha penangkaran burung. Penelitian ini dilaksanakan di Desa Wukirsari pada Februari hingga Maret 2020 dengan metode wawancara. Analisis yang digunakan dalam penelitian adalah metode cash flow. Hasil penelitian ini menunjukkan bahwa usaha penangkaran burung di Dusun Karangtalun merupakan usaha skala mikro. Jenis burung yang ditangkarkan meliputi perkutut, lovebird, dederuk jawa, dan kenari. Total nilai ekonomi finansial usaha penangkaran burung sebesar Rp 18.017.647,-. Kontribusinya terhadap ekonomi keluarga sebesar 48,02% dan terhadap PDRB sebesar 67,27%. Alternatif pengembangan usaha meliputi pelegalan paguyuban penangkar, penyempurnaan program kerja, inovasi dan pengembangan, pengaktifan kembali desa wisata, dan menjalin kerjasama dengan pihak terkait., The number of bird breeding business in Central Java and the Special Region of Yogyakarta was recorded at 28.9% more than other animals. The aims of this study were to analyze the condition of captive bird breeding in Karangtalun Hamlet, to analyze the financial economic value and contribution of the captive bird breeding business, and to determine strategies alternative to develop a captive breeding business. This study was carried out in in Karangtalun Hamlet from February to March 2020 with the interview method. The analysis used in this study is the cash flow method. The results of this study indicate that the bird breeding business in Karangtalun Hamlet is a micro-scale business. The types of birds that are bred included turtledoves, lovebirds, Javanese dederuk, and canaries. The total financial economic value of the bird breeding business was Rp 18.017.647.-. Its contribution to the family economy was 48,02% and to PDRB was 67,27%. Alternative business development included legalizing bird breeding associations, improving work programs, innovation and development, reactivating tourism villages, and establishing cooperation with related parties.
Keyword: breeding, cashflow, community, revenue

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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