Judul: Nilai Ekonomi Tumbuhan Obat Menurut Masyarakat Baduy: Studi Kasus di Desa Kanekes, Leuwidamar, Lebak, Banten
Abstrak: Tumbuhan obat di Indonesia memiliki potensi yang besar untuk dikembangkan. Indonesia tercatat memiliki 2.848 spesies tumbuhan obat dan 32.014 ramuan obat. Salah satu masyarakat yang secara turun-temurun telah memanfaatkan tumbuhan obat adalah masyarakat Baduy. Di sisi lain, cukup banyaknya layanan kesehatan yang tersedia di sekitar kampung Baduy Luar, membuat adanya kemungkinan masyarakat Baduy beralih menggunakan pengobatan modern. Besar nilai ekonomi tumbuhan obat di Desa Kanekes belum diketahui. Oleh karena itu, penelitian ini bertujuan untuk mengestimasi besar nilai ekonomi tumbuhan obat menurut masyarakat Baduy. Nilai ekonomi tumbuhan obat ditentukan dengan menggunakan contingent valuation method (CVM). Nilai willingness to pay (WTP) diduga berdasarkan data yang diperoleh dari 41 responden dengan menggunakan kuesioner dengan open-ended questions. Pemodelan binomial logit kemudian dilakukan untuk mempelajari faktor yang berpengaruh terhadap kesediaan masyarakat membayar nilai tumbuhan obat. Hasil penelitian menunjukkan kemampuan membaca (Xra) berpengaruh positif dan signifikan terhadap kesediaan masyarakat membayar tumbuhan obat. Masyarakat yang mampu membaca memiliki peluang lebih tinggi untuk membayar tumbuhan obat 6,35 kali lebih besar daripada yang tidak dapat membaca. Nilai ekonomi tumbuhan obat diperkirakan sebesar Rp172.857/orang/tahun., Medicinal plants in Indonesia have great potential to be developed. Indonesia recorded to have 2.848 species of medicinal plants and 32.014 herbal medicine. One of the communities that has been using it for generations is Baduy Indigenous Community. On the other hand, there are health services around Outer Baduy, making it possible for the Baduy Indigenous Community to switch using modern medicine. The economic value of medicinal plants at Kanekes Village is not yet known. Therefore, this study aims to estimate the economic value of medicinal plants according to Baduy Indigenous Community. The economic value of medicinal plants was determined using contingent valuation method (CVM). The value of willingness to pay (WTP) was estimated based on data obtained from 41 respondents using questionnaire with open-ended questions. Binomial logit model was then carried out to study the factors that influence the people’s willingness to pay for medicinal plants. The results of the study indicated that the ability to read (Xra) has a positive and significant effect on people’s willingness to pay for medicinal plants. People who can read has a higher chance to pay for medicinal plants 6,35 times more than those who cannot read. The economic value of medicinal plants was estimated about Rp172.857/person/year.
Keyword: binomial logit, Contingent Valuation Method, hasil hutan bukan kayu, Willingness to Pay

Judul: Potensi Tumbuhan Obat di Desa Gunungsari, Kecamatan Sukanagara, Kabupaten Cianjur, Jawa Barat
Abstrak: Penggunaan tumbuhan obat masih sering dijumpai pada komunitas masyarakat sekitar hutan. Desa Gunungsari memiliki hutan yang dikelola oleh Perum Perhutani dimana masyarakat ikut terlibat dalam praktiknya. Aktivitas masyarakat di hutan mengindikasikan adanya pemanfaatan tumbuhan obat, namun belum diketahui bagaimana bentuk pemanfaatannya. Penelitian ini bertujuan untuk menganalisis keanekaragaman tumbuhan yang ada di hutan desa lalu mengidentifikasi tumbuhan obat dan potensi pengembangannya. Penelitian dilaksanakan dari November 2022 - Januari 2023 di Desa Gunungsari. Metode pengumpulan data menggunakan studi literatur, wawancara, serta analisis vegetasi digunakan untuk mencari data pemanfaatan oleh masyarakat, keanekaragaman vegetasi, serta potensi tumbuhan obat. Hasil menunjukkan terdapat 66 cara pemanfaatan tumbuhan obat oleh masyarakat, ditemukan 53 spesies dari 43 famili tumbuhan di hutan dengan 42 spesies diketahui memiliki khasiat obat, serta 10 diantaranya memiliki potensi untuk dikembangkan. Kata kunci: pemanfaatan, potensi, tumbuhan obat, The use of medicinal plants is still prevalent within forest communities. Gunungsari Village hosted a forest managed by Perum Perhutani, which involves community participation. The specific methods of how the people utilizing medicinal plants remain unclear. This research aims to analyze the botanical diversity within village forests and identify their medicinal potential. Carried out from November 2022 to January 2023 in Gunungsari Village, the research collected data through literature reviews, interviews, and vegetation analysis. This research revealed that the community employed 66 different methods of utilizing medicinal plants. There were 53 species from 43 different plant families identified, of which 42 were recognized for their medicinal properties. Furthermore, 10 of these species were identified as having significant potential for further development. Keywords: medicinal plants, potential, utilization
Keyword: pemanfaatan, potensi, tumbuhan obat

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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