Judul: The  performance  of  offspring  male  rats  (rattus  norvegicus) from its mother whose had been threatened by adding ethanol that  is extracted from purwoceng roots (pimpinella  alpine) on  day  1 to  day  13 of  pregnancy
Abstrak: Purwoceng (Pimpinella alpina) adalah tanaman obat langka asli Indonesia yang digunakan sebagai obat tradisional. Akarnya berkhasiat sebagai afrodisiak. Tujuan penelitian ini adalah mengkaji pemberian ekstrak etanol akar purwoceng pada induk tikus (Rattus norvegicus) dengan dosis 25 mg/300 g bobot badan selama 1-13 hari kebuntingan terhadap perkembangan tulang, bobot badan dan penurunan testis anak tikus jantan. Sebanyak 10 ekor anak tikus jantan yang berasal dari 2 kelompok induk tikus yaitu kelompok kontrol dan kelompok perlakuan (diberi purwoceng) dipelihara dan diamati perkembangannya. Hasil penelitian menunjukkan bahwa ekstrak etanol akar purwoceng dapat meningkatkan perkembangan tulang kepala pada hari ke-42, tulang punggung pada hari 1 sampai hari ke-70, tulang kaki belakang pada hari ke-56 dan hari ke-70, penambahan bobot badan pada hari ke-21 dan hari ke-49, dan penurunan testis pada hari ke-42., Purwoceng (Pimpinella alpine) is a native Indonesian medical plant species that is used to be traditional medicine. It’s root has an efficacious as aphrodisiac. This research is aimed to observe the effectivity of 25 mg/300 BW dosage of purwoceng root’s ethanol which given to pregnant rat during day 1 to day 13 on the development of skeleton, body weight, and testicle emerge of its male offspring. A total of 10 male rats have been birth from control group and treatment group (given Purwoceng) were being cared, observed, and measured for the development of skeleton, body weight, and testicle emerge. The results showed that ethanol extract purwoceng root’s could improve the development of cranial on day 42, backbone on day 1 to day 70, rear leg bones on day 56 and day 70, increased body weight on day 21 and day 49, and caused testicle emerging on day 42.
Keyword: Afrodisiak, Ekstrak Etanol, Purwoceng, Rattus norvegicus

Judul: Efektivitas pemberian ekstrak etanol purwoceng (Pimpinella alpina) selama 13-21 hari kebuntingan terhadap bobot organ reproduksi dan anak tikus putih (Rattus sp.)
Abstrak: The study aims to observe the effect day of purwoceng (Pimpinella alpina) ethanole extract which given at 13-21 days age of pregnancy on ovarium, uterus, placenta, and pups weight. The rats were divided in to two groups. One of groups was rats that treated by purwoceng 25 mg/300 g body weight and the other groups control (no treatment). Purwoceng ethanole extract was given on the 13th until the 21st day of pregnancy. The rats was dissected on day 21 to take an ovarium, uterus, placenta, and pups, and to observe their weight. The result indicated that purwoceng ethanole extract tended to increase weight of ovarium, uterus, and pups but had no effect towards placenta.
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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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