Judul: Bioavailabilitas kalsium dan zat besi in vitro cookies pati garut (Maranta arundinaceae L) dengan penambahan Torbangun (coleus amboinicus Lour) pada berbagai minuman
Abstrak: Mineral deficiencies, such as calcium and iron, remain a major problem in many developing countries including Indonesia. Arrowroot starch cookies with torbangun flour addition (namely PGT cookies) is one of innovative product which is developed as one of micronutrient source. PGT cookies contain 527 Cal, calcium 405.18 mg/100g and iron 3.76 mg/100 g. PGT Cookies as snack are commonly consumed with drinks, such as tea, portable water, coffee and milk. Nutrient and non-nutrient contain of food which is consumed together can interact one another and possibely influence nutrient bioavailability. This research aimed to indetify calcium and iron in vitro bioavailability of PGT cookies and baverage mixture. Calcium bioavailability lies between 0.76 – 11.46%. Iron bioavailability lies between 0.92 – 5.95%. One way ANOVA test shown that types of mixture significantly affect the calcium and iron bioavailability (p<0.05). Based on Pearson correlation test result, protein have positive (+0.644) and significant (p<0.01) affection to calcium bioavailability. Furthermore, total iron have negative (-0.743) and significant (p<0.01) affection to iron bioavalability. Mixture of PGT cookies and milk have highest calcium (41,77 mg/100g) and iron (0,153 mg/100g) available. In conclusion, torbangun adding in cookies and consumption together with milk increase calcium and iron available.
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Judul: Formulasi cookies berbasis pati garut (Maranta arundinaceae Linn.) dengan penambahan tepung Torbangun (Coleus amboinicus Lour) sebagai sumber zat gizi mikro
Abstrak: Food is one of the basic of human needs that have to be compiled with. Therefore, the government in Indonesia have organized it by the Laws of Food in 1996 Number 7. Laws of Food in 1996 Number 7 also organize about food security. Food security is one of the concept where most of people- individuals and families-citizens of the country could get their needs of food easily. Food diversification is one of the efforts to establish food security. And, one of the most important of food diversification concept is to diversify carbohydate sources. This research based on Presidential Regulation Number 22 Year 2009 and Ministry of Agricultural Regulation Number 43 Year 2009 for increasing food consumption diversification through balanced diet. Carbohydrate sources are not only from rice, but also from other crops like tubers. Tubers in Indonesia are very large amount and kinds. One of them is arrowroot (Maranta arundinaceae Linn.). Many people have known about arrowroot but the research of arrowroot utilizations are still lack. So, it`s so important to make it in research. The purpose of this research was to get the most appropriate formulation of arrowroot starch and torbangun flour cookies as micronutrients sources. The experimental design used in this study was a randomized block design. The level of adding torbangun flour to arrowroot starch was 0%, 10%, 15%, and 20%. The study showed that the 10% adding of torbangun flour was the most organoleptic level. The addition of torbangun flour also could be the sources of micronutrient of calcium (376.60 mg/100g) and iron (3.83 mg/100g). It is recommended that the people should eat 100-gram cookies per day to fulfill the nutrient requirement.
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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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