Judul: Aktivitas Antibakteri dan Antioksidan Tiga Jenis Madu Hutan Indonesia
Abstrak: This study was conducted to determine the antibacterial and antioxidant activity of three types Indonesian forest honey, including honey forests of West Kalimantan (KB1), Sumatra (SM1) and Sumbawa (SB1). Antibacterial testing, was determined by sumur method with three concentration, ie 25%, 50% and 100% on four types of bacteria, Staphylococcus aureus, Salmonella typhi, Escherichia coli and Pseudomonas aeruginosa, while its antioxidant activity, was determined by DPPH (1-diphenyl-2-picrylhydrazil) method. The test results indicate that all three forest honey has antibacterial and antioxidant activity. SB1 forest honey has the best antibacterial activity specifically against S.thypi and E.coli with inhibitory diameter 32.5 mm dan 27.5 mm. In order of goodness with EC50 successively acquired KB1, SM1 and SB1 forest honey is 2725.722 ppm, 2872.765 ppm dan 4341.545 ppm. Antibacterial and antioxidant honey sourced from the content of one group of active compounds such as honey, alkaloids, phenolics, flavonoids, triterpenoids, saponins and glycosides.
Keyword: forest honey, antioxidant, antibacterial

Judul: Physicochemical Properties and Antioxidant Activities Multiflora Honey from Kerinci Regency Jambi
Abstrak: Madu merupakan cairan kental yang dihasilkan oleh lebah madu (Apis sp.) dari nektar bunga atau bagian tanaman lainnya. Penelitian ini bertujuan menganalisis sifat fisikokimia dan aktivitas antioksidan madu multiflora (madu hutan Apis dorsata) dan (madu budidaya Apis cerana) dari Kabupaten Kerinci, Jambi. Sifat fisikokimia yang dianalisis adalah warna, pH, viskositas, kadar air, kadar abu, kadar gula, kadar HMF, keasaman, dan aktivitas antioksidan. Hasil penelitian menunjukkan bahwa madu hutan berwarna Light Amber, sedangkan madu budidaya berwarna Extra Light Amber. Kualitas madu hutan yang memenuhi SNI 01-3545-2013 adalah pH, viskositas, kadar air, kadar gula, kadar HMF, dan keasaman, namun memiliki kadar abu yang melebihi batas SNI 01- 3545-2013. Madu budidaya memiliki pH, kadar gula, dan kadar HMF yang memenuhi SNI 01-3545-2013, namun memiliki viskositas, kadar air, kadar abu, dan keasaman yang belum memenuhi SNI 01-3545-2013. Madu hutan dan madu budidaya memiliki kapasitas antioksidan masing-masing sebesar 16,74 mgVCE/g dan 16,60 mgVCE/g, sedangkan aktivitas antioksidannya berturut-turut adalah 63,80% dan 63,28%, Honey is a thick liquid produced by honey bees (Apis sp.) from flower nectar or other parts of plants. This study aims to examine the physicochemical properties and antioxidant activities of multifloral honey (Apis dorsata forest honey) and (Apis cerana cultivated honey) from Kerinci, Jambi. The analysed physicochemical properties were colour, pH, viscosity, water content, ash content, sugar content, HMF content, acidity and antioxidant activity. The results showed that forest honey has Light Amber colour while cultivated honey has Extra Light Amber colour. The quality of forest honey that meet SNI 01-3545-2013 is pH, viscosity, water content, ash content, sugar content, HMF content, and acidity, however the ash content exceeded SNI 01-3545-2013. Cultivated honey has pH, sugar content, and HMF content is which meet the SNI 01-3545-2013, however the viscosity, water content, ash content, and acidity was that didn't meet SNI 01- 3545-2013. Forest honey and cultivated honey have antioxidant capacities of 16,74 mgVCE/g and 16,60 mgVCE/g, meanwhile the antioxidant activity were 63,80% and 63,28%.
Keyword: antioxidant activities, cultivated honey, forest honey, multifloral honey, physicochemical properties

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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