Judul: Utilization of medicinal plants of kasepuhan community at ciptarasa and ciptagelar village sukabumi
Abstrak: Masyarakat Kasepuhan Ciptarasa dan Ciptagelar adalah kelompok masyarakat yang bermukim di sekitar kawasan Taman Nasional Gunung Halimun-Salak. Tumbuhan obat masih digunakan oleh masyarakat Kasepuhan untuk pengobatan sehari-hari. Tujuan penelitian adalah untuk mengidentifikasi jenis tumbuhan obat yang dimanfaatkan, cara pengolahan dan penggunaan oleh masyarakat di Kampung Ciptarasa dan Ciptagelar Sukabumi. Metode yang digunakan adalah metode snowball sampling dengan total 60 responden. Total jenis tumbuhan obat yang dimanfaatkan oleh masyarakat di Kampung Ciptarasa sebanyak 54 jenis dari 30 famili dan di Kampung Ciptagelar sebanyak 51 jenis dari 28 famili. Tumbuhan obat berdasarkan habitus dapat dikelompokkan kedalam 4 kelompok yaitu, perdu, herba, pohon, dan liana, sedangkan berdasarkan bagian yang digunakannya dapat dikelompokkan menjadi 8 yaitu, akar, daun, buah, pucuk, batang, jantung, umbi dan seluruh bagian. Kelompok kegunaan tumbuhan obat yang sering digunakan yaitu penyakit saluran pencernaan, serta penyakit otot dan persendian. Cara pengolahan yang sering digunakan yaitu direbus, dan cara penggunaan yang sering digunakan yaitu diminum. Jenis tumbuhan obat unggulan di Kampung Ciptagelar sebanyak 8 jenis dan di Kampung Ciptarasa sebanyak 6 jenis., The community of Kasepuhan Ciptarasa and Ciptagelar settled in the area of Gunung Halimun Salak National Park. Medicinal plants were still used daily by the community of Kasepuhan for the disease treatment. The purpose of this research was to identified the species of medicinal plants were utilized, the way of processing and the utilization in Ciptarasa and Ciptagelar village Sukabumi. The method used was the snowball method with 60 respondents of the village. The type of medicinal plants which using by the community in Ciptarasa village was 54 species from 30 families and 51 species from 28 family in Ciptagelar village. Medicinal plants based on habitus was 4 groups, there were shrubs, herbaceous, trees and liana. Based on the sections grouped into 8, there were roots, leaves, fruits, shoots, stem, heart, bulbs and the entire plant section. The usability group of medicinal plants that were frequently used for the muscle pain. The way of processing that was boiled, consumed araly. Superior plant species that used was 8 types in Ciptagelar village and 6 types in Ciptarasa village.
Keyword: habitus, kasepuhan, responden, tumbuhan obat

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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