Judul: Efektivitas Minyak Kemiri (Aleurites moluccana L.) sebagai Penumbuh Rambut pada Tikus (Rattus norvegicus).
Abstrak: Rambut rontok merupakan masalah yang banyak dijumpai dan mengakibatkan kebotakan. Kebotakan dapat dicegah dengan produk sintetis maupun herbal, namun produk sintetis dapat menimbulkan efek samping. Minyak kemiri mampu menjadi alternatif pengobatan karena terbuat dari bahan alam dan aman digunakan. Penelitian ini bertujuan menguji efektivitas minyak kemiri sebagai penumbuh rambut. Kelompok perlakuan terdiri atas kelompok kontrol tanpa pengolesan (A), kelompok dengan pengolesan sekali sehari (B), kelompok dengan pengolesan dua kali sehari (C), dan kelompok dengan pengolesan tiga kali sehari (D). Panjang rambut diukur dan uji iritasi dilakukan pada hari ke-6, 9, 12, dan 15 dengan perlakuan diberikan setiap hari secara topikal pada punggung tikus yang telah dicukur. Hasil penelitian menujukkan bahwa minyak kemiri memiliki efektivitas sebagai penumbuh rambut. Uji efektivitas minyak kemiri sebagai penumbuh rambut menunjukkan pertumbuhan rambut yang lebih cepat secara statistik dibandingkan kontrol pada frekuensi pengolesan tiga kali sehari dan tidak berbeda nyata dibandingkan dengan pengolesan satu kali dan dua kali sehari. Uji iritasi yang dilakukan tidak menunjukkan adanya iritasi pada punggung tikus., Hair loss is a common problem and it can cause baldness. Baldness may be prevented with synthetic or herbal product, however synthetic products may have side effects. Candlenut oil can be used as an alternative treatment because it is made from natural ingredients and also safe to use. This study aims to test the effectiveness of pure candlenut oil as hair growth promoters. The treatment groups consisted of control rats without smearing of candlenut oil (A), rats receiving smearing of candlenut oil once a day (B), rats receiving smearing of candlenut oil twice a day (C), and rats receiving smearing of candlenut oil three times a day (D). Hair length was measured and irritation tests were carried out on day 6th, 9th, 12th, and 15th with the topical treatment daily on the shaved areas at the back of the rats. The results of the study show that pure candlenut oil has effectiveness as hair growth promoter. The fastest hair growth was found in rats receiving smearing of candlenut oil three times a day. There was no significant difference in hair growth in rats receiving smearing of candlenut oil once and twice a day compare to control. The irritation test did not show any sign of irritation on the rat's back.
Keyword: baldness, candlenut oil, hair, hair growth promoters, herbal products

Judul: The Effects of Avocado Oil (Persea americana Mill.) as Hair Growth Promoters on Rats (Rattus novergicus)
Abstrak: Essential oils and carrier oils are commonly used as pharmacology cosmetics in promoting hair growth. Avocado oil is one of the carrier oils rarely discussed as a hair growth-promoting cosmetics as compared to other oils. This study determined the effects of avocado oil (Persea americana Mill.) as hair growth promoter on rats (Rattus norvegicus). A total of 6 rats were used and each rat was divided into 4 treatment areas: control, 1 smear a day, 2 smears a day, and 3 smears a day. The parameters are hair length and irritation reaction. Data were collected on day 6th, 9th, 12th and 15th. Descriptive analysis was initially performed to examine the trend of the data. Based on the trend of the data, the treatment of 1 smear a day showed a slight increase in hair length. Subsequently, ANOVA one-way and Tukey tests were conducted to determine the statistical significance of the results. The statistical analysis results indicated that avocado oil did not have a significant effect as a hair growth promoter. Furthermore, no signs of irritation were observed on the application site of the rats. In conclusion, while the descriptive analysis suggested 1 smear a day of avocado oil show effects as hair growth promoter, however the subsequent statistical analysis only support little significant effect.
Keyword: avocado oil, hair growth, irritation

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.
Keyword: