Judul: Persepsi dan Sikap Masyarakat Diaspora Gayo dalam Konservasi Tumbuhan Pangan
Abstrak: Sumber daya alam akan dapat dilestarikan dan dikelola dengan lebih baik jika melibatkan masyarakat yang bergantung pada sumber daya alam tersebut. Kehadiran Komunitas Diaspora dapat membantu mempertahankann sumber daya diluar wilayah asal mereka. Penelitian ini bertujuan untuk mengidentifikasi persepsi dan sikap masyarakat Diaspora Gayo dan menentukan karakteristik individu yang memengaruhi persepsi dan sikap masyarakat Diaspora Gayo dalam konservasi tumbuhan pangan. Pengumpulan data dilakukan dengan wawancara dengan penentuan responden secara accidental sampling, observasi, dan studi pustaka. Hasil penelitian menunjukkan bahwa persepsi dan sikap yang positif terhadap pemanfaatan tumbuhan pangan. Hasil analisis menunjukkan bahwa mayoritas karakteristik responden tidak berhubungan dengan persepsi dan sikap kecuali pendidikan (p-value 0,021) terhadap sikap. Pengetahuan tradisional terhadap pemanfaatan tumbuhan pangan pada masyarakat Gayo akan mampu membentuk masyarakat yang dapat menjaga ketersediaan dan kelestarian tumbuhan pangan., Natural resources will be better preserved and managed if the communities dependent on these natural resources are involved. The presence of the diaspora community can contribute to the maintenance of resources outside their home territory. This study aims to identify the perceptions and attitudes of the Gayo Diaspora community and identify individual characteristics that affect the perceptions and attitudes of the Gayo diaspora community with respect to the conservation of food plants. Data collection was carried out through interviews through accidental sampling, observation and literature review. Results from the study indicate positive perceptions and attitudes about the use of food plants. The results of the analysis showed that the characteristics of the majority of respondents were unrelated to perceptions and attitudes, with the exception of education (p-value 0,021) on attitudes. Traditional knowledge about the use of food plants in the Gayo community will be able to form a society that can keep food plants available and sustainable.
Keyword: Attitude, characteristics, diaspora, perception

Judul: The Influence of Urbanization on Gayo-Lut Traditional Knowledge and Biodiversity conservation through Culinary-Based Ecotourism
Abstrak: The wealth of natural resources can be utilized to support food security through the production of food, increased income access, and safe-sanitary food preparation. The utilization of food plants is reflected in the community’s traditional knowledge of how they were used, protected, and preserved for a long time as a cultural custom in traditional cuisines. One of the great challenges to sustaining the sustainability of food plants is urbanization and modern lifestyle. Several studies have found that the process of becoming more urban has a negative impact on natural resource knowledge and that urbanization is related to the loss of the ability to recognize and understand plants. A strategy that can be used to enhance biodiversity and sustain ecosystem service is the combination of traditional knowledge and culture which can be seen in their traditional cuisines. Unfortunately, there is more traditional knowledge that is passed down in oral form through stories, experiences, and language than stored documentation. This could potentially lead to knowledge loss if people start not knowing their food plants because of the difficulty in adapting to food plants in new places. This research was conducted on the Gayo Lut community in two locations to see the effect of urbanization. The first group was in Mude Nosar Village, Central Aceh in November-December 2020, and the second group was in the Gayo community, Musara Gayo in the Jakarta-Bogor-Depok-Tangerang-Bekasi (Jabodetabek) area in March-April 2021. The next research respondents grouped more specifically, namely the elder group (>59 years in Mude Nosar Village; 16 respondents), rural (<60 years in Mude Nosar Village; 16 respondents), and urban (<60 years in Jabodetabek; 16 respondents). Data collection was carried out in 2 stages. The first stage is an interview using the freelisting technique, and a semi-structured interview to identify the traditional knowledge of food plants, traditional cuisines, and details regarding their utilization. Then the second stage is a field study that aims to map the coordinate distribution of food plants and tourist objects. Freelisting data were analyzed using Anthropac and the Jaccard index to see species diversity and the effect of urbanization. Then analyzed descriptively. The coordinate data for the distribution of food plants and the distribution of tourist objects that have been obtained are mapped using ArcMap to see their distribution. The results of the study found that urbanization affected the community's traditional knowledge. This can be seen from the differences in the types of important food plants between each group due to adaptation to changing times and location of residence. But on the other hand, urbanization also offers a modification of traditional knowledge in traditional cooking which still maintains the authenticity of the distinctive taste of dishes. The adaptation is done with add up or substitution ingredients which easier to find in Jabodetabek. In three communities studied, recorded 188 species (elder 120 species; rural 116 species; urban 124 Species) of food plants are used by the community. For elder and rural groups, lasun ilang (Allium cepa) being the most important species because it is a major economic source besides coffee and rice. Then, there is
Keyword: culinary-based ecotourism, food plant, Gayo Lut, traditional cuisine, traditional knowledge

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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