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: Potential Effect of Apple Juice (Malus domestica) as Hair Growth Promoter in Rat (Rattus norvegicus)
Abstrak: Rambut berfungsi untuk memberikan kehangatan, perlindungan, keindahan serta penunjang penampilan. Kerontokan rambut yang dapat mengakibatkan kebotakan merupakan salah satu problema yang paling dikhawatirkan setiap orang. Kebotakan biasanya di obati dengan mengonsumsi obat tertentu namun keamanan dari obat-obatan tersebut belum tentu terjamin. Bahan alami menjadi salah satu alternatif yang dapat dipilih, diantaranya adalah sari buah apel (Malus domestica). Penelitian ini bertujuan menguji dan mempelajari efektivitas sari buah apel sebagai penumbuh rambut serta menganalisis frekuensi pengolesan terbaik dengan parameter pertumbuhan rambut dan reaksi iritasi pada tikus (Rattus norvegicus). Sebanyak 6 ekor tikus dibagi menjadi 4 perlakuan pada masing-masing tikus yaitu kontrol (tidak diberi olesan), 1 kali oles sehari, 2 kali oles sehari, dan 3 kali oles sehari. Pengukuran panjang rambut tikus dilakukan pada hari ke-6, 9, 12, dan 15 serta menganalisis skor eritema dan edema atau Primary Dermal Irritation Index (PDII). Hasil penelitian menunjukkan sari buah apel memiliki efek yang signifikan sebagai pemacu pertumbuhan rambut. Pemberian olesan sebanyak 3 kali sehari menjadi kelompok dengan frekuensi pemberian olesan terbaik karena memiliki perbedaan nyata terhadap kelompok kontrol. Tidak ada reaksi iritasi yang ditimbulkan dari sari buah apel saat dilakukan uji iritasi pada tikus., Hair serves to provide warmth, protection, beauty, and for better appearance. Hair loss which can lead to baldness is one of the major concerns for everyone. Baldness is usually treated by taking certain drugs, but the safety of these drugs is not guaranteed. Natural ingredients are an alternative option as treatment, including apple cider (Malus domestica). This study aims to test and study the effectiveness of apple cider as hair growth promoter and to analyze the best application frequency with parameters of hair growth and irritation reactions in rats (Rattus norvegicus). A total of 6 rats were divided into 4 treatment areas in each individual, namely control (not given a spread), 1 smear a day, 2 smears a day, and 3 smears a day. The hair length measurements of the rats were carried out on the 6th, 9th, 12th, and 15th days and analyzed the erythema and edema scores or the Primary Dermal Irritation Index (PDII). The results showed that apple cider has a significant effect as a hair growth promoter. Applying 3 smears a day is the group with the best smearing frequency because it has a significant difference from the control group. There was no irritation reaction caused by apple cider when the irritation test was carried out on rats.
Keyword: kebotakan, penumbuh rambut, reaksi iritasi, sari buah apel

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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