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: Utilization of Medical Plants by the people of Sukarama Village, Bojongpicung District, Cianjur Regency, West Java
Abstrak: Pemanfaatan tumbuhan obat yang dilakukan oleh masyarakat masih dijadikan sebagai tradisi turun-temurun khususnya masyarakat pedesaan. Masyarakat Desa Sukarama memiliki pengetahuan tumbuhan yang dimanfaatkan sebagai obat yang masih dilestarikan sampai sekarang, namun data dan informasi mengenai pengetahuan tersebut masih sangat kurang. Penelitian ini bertujuan untuk mengidentifikasi jenis-jenis tumbuhan obat serta bentuk pemanfaatannya di Desa Sukarama. Penelitian dilakukan pada bulan Februari – Maret 2022 di Desa Sukarama. Alat dan bahan yang digunakan berupa perlengkapan wawancara dan eksplorasi tumbuhan. Metode pengambilan data yang digunakan dalam penelitian adalah studi literatur, eksplorasi tumbuhan, wawancara masyarakat desa, observasi partisipatif, survei lapangan, dan pembuatan herbarium. Hasil penelitian menunjukkan bahwa ditemukan 106 spesies tumbuhan dari 48 famili dengan bentuk pemanfaatan sebagai bahan obat sebanyak 106 spesies tumbuhan, 17 spesies bahan jamu, 16 spesies bahan bumbu, 8 spesies lalapan, serta 8 spesies tumbuhan sebagai penjualan. Bentuk pemanfaatan terbanyak yang dimanfaatkan oleh masyarakat desa adalah bahan obat., The use of medicinal plants by the community is still used as a hereditary tradition, especially in rural communities. The people of Sukarama Village have knowledge of plants that are used as medicine which are still preserved until now, but data and information about this knowledge are still very lacking. This study aims to identify the types of medicinal plants and their forms of use in Sukarama Village. The research was conducted in February – March 2022 in Sukarama Village. The tools and materials used are interview equipment and plant exploration. The data collection methods used in the study were literature study, plant exploration, village community interviews, participatory observation, field surveys, and making herbarium. The results showed that there were 106 plant species from 48 families with 106 types of medicinal uses, 17 types of herbal ingredients, 16 types of spices, 8 types of fresh vegetables, and 8 types of plants for sale. The most common form of utilization used by the village community is medicinal ingredients.
Keyword: medical plants, sukarama village, utilization

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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