Judul: Keanekaragaman Simplisia Nabati dan Produk Obat Tradisional yang Diperdagangkan di Kudus, Jawa Tengah.
Abstrak: Utilization of medicinal plants was increased every year so that need to collect data to minimize scarcity because of overexploitation. The purpose of this study were to identify: diversity of vegetable simplisia and traditional medicine product trade in Kudus, price of sale and stock source, also threteaned status of medicinal plants using interview with questions list method and purposive sampling to select person. There were 140 species from 51 family that dominated by Fabaceae (11.43%), life form was herb (39.29%), simplisia leaf (folium) (22.22%), and dominant for digestive diseases (43 species). There were 59 of traditional medicine products from Sidomuncul, Gujati 59, Bisma Sehat and Deltomed with dominant composition of ginger rhizome (21 products). Selling price was variation that supplied from Johar market Semarang and surrounding area of each market. Identified 12 species include of threatened category LIPI, 3 species of Appendix II CITES, 3 species Least Concern, 1 species Vulnerable and 1 species Endangered based on IUCN Redlist.
Keyword: Kudus, traditional medicine product, vegetable simplisia

Judul: Keanekaragaman Simplisia Nabati dan Produk Obat Tradisional yang Diperdagangkan di Kota Padang, Sumatera Barat
Abstrak: The utilization of plants as traditional medicine has been known from generation to generation and continued to grow up until now. Nowadays, medicinal plants are often used in the form of simplisia. Simplisia was natural material which have not undergone a change of form and can be used as medicine. The aim of this research was to identified kinds of simplisia vegetable, traditional medicinal products, the origin of supply and also the simplisia’s price that had been traded in Padang City. Data collection was done by direct observation and interview method. The result showed that there are 142 medicinal plant species from 56 families which is traded as simplisia. Most medicinal plants sold in the form of simplisia were obtained from plants that grows wild in the nature and also from cultivation. Simplisia from the wild have price between Rp2 000 to Rp5 000 / bunch. This price is still too low considering that there are some simplisia from the forest which has been categorized as rare plants, such as pulosari (Alyxia reinwardtii) and pulai (Alstonia scholaris). Traditional medicinal products traded in Padang city were produced by home industries, medium-scale industries, and top-scale industries in Java. There are 53 kinds of traditional medicinal products from 9 traditional medicine industries in Indonesia.
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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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