Judul: Ethnophytomedic Comparison of the Tapos Village Community and Test the Efficacy of Medicinal Plants from Literature Studies
Abstrak: Keanekaragaman jenis tumbuhan obat di Kampung Tapos berpotensi untuk dikembangkan. Namun kajian tumbuhan obat masih belum banyak dilakukan. Penelitian ini bertujuan membandingkan etnofitomedika Kampung Tapos dan studi pustaka uji khasiat tumbuhan obat. Penelitian ini diharapkan dapat memberikan referensi untuk penelitian selanjutnya dan sebagai acuan dalam upaya peningkatan pemahaman masyarakat tentang tumbuhan obat. Penelitian dilaksanakan bulan April sampai Oktober 2020 di Kampung Tapos dan secara daring. Metode pengumpulan data melalui beberapa tahapan, yaitu studi pustaka, observasi, wawancara tidak terstruktur, dan dokumentasi. Hasil penelitian ini, sebanyak 99 jenis tumbuhan obat didominasi habitus herba sebanyak 39%. Bagian yang paling banyak dimanfaatkan yaitu daun sebanyak 60% dan sebanyak 59% merupakan tumbuhan obat budidaya. Sebagian besar jenis tumbuhan digunakan untuk menyembuhkan kelompok penyakit saluran pencernaan sebanyak 23 jenis tumbuhan. Masyarakat Kampung Tapos masih mempertahankan kearifan lokal dalam memanfaatkan tumbuhan obat. Sebagian pengetahuan masyarakat telah sejalan dengan hasil penelitian ilmiah. Kata kunci : etnofitomedika, Kampung Tapos, tumbuhan obat, The diversity of medicinal plants in Tapos Village has the potential to be developed. However, there are not many studies were done on medicinal plants. This study aims to compare the ethnophytomedics of Tapos Village and literature studies on the efficacy of medicinal plants. This research is expected to provide a reference for further research and as a reference in efforts to increase public understanding of medicinal plants. The research was conducted from April to October 2020 in Tapos Village and online. The method of collecting data through several stages, namely literature study, observation, unstructured interviews, and documentation. The results of this study, as many as 99 types of medicinal plants dominated by herbal habitus as much as 39%. The most widely used part was leaves as much as 60% and as much as 59% were cultivated medicinal plants. Most types of plants are used to cure a group of 23 types of digestive tract diseases. The people of Kampung Tapos still maintain local wisdom in utilizing medicinal plants. Some of the people's knowledge has been in line with the results of scientific research. Keywords : ethnophytomedicine, Tapos Village, medicinal plants
Keyword: Ethnophytomedicine, Tapos Village, Medicinal plants

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: 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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