Judul: Pengembangan Snack Bar sebagai Pangan Jajanan Sehat Tinggi Serat.
Abstrak: Pola konsumsi pangan yang tidak seimbang dan rendahnya aktivitas fisik menyebabkan kurangnya asupan serat pangan dan terjadinya gizi lebih yang berhujung pada obesitas. Penelitian ini bertujuan untuk membuat pangan jajanan sehat tinggi serat berupa snack bar berbahan dasar tepung ampas tahu, tepung ubi jalar ungu, dan tepung maizena. Dua variabel yang diuji adalah perbandingan antara tepung ubi jalar ungu dengan tepung maizena sebesar 1:1, 1:2 (b/b), serta penambahan tepung ampas tahu sebesar 20, 25, dan 30%. Sebagai kontrol, snack bar dibuat dari tepung terigu. Analisis yang dilakuakan meliputi analisis sensori dan fisikokimia. Snack bar yang direkomendasikan sebagai pangan jajanan sehat tinggi serat yaitu snack bar yang dibuat dari tepung ampas tahu 20% dengan perbandingan tepung ubi jalar ungu dan tepung maizena 1:2 (b/b). Snack bar tersebut memiliki skor kesukaan 4.31 pada atribut keseluruhan yang berarti netral, kadar antosianin 1.97 mg/ 100 g (bk), dan kadar serat pangan total sebesar 13.87% (bk), sehingga tergolong dalam pangan tinggi serat sesuai dengan Peraturan Kepala BPOM RI Nomor HK 03.1.23.11.11.09909 tahun 2011.
Keyword: ampas tahu, serat pangan, snack bar, ubi ungu

Judul: Pemanfaatan tepung jewawut (Pennisetum glaucum) dan tepung ampas tahu dalam formulasi snack bar
Abstrak: Snack is food which is consumed between main meals. That is why the demand for snack foods is increasing. Many of these snack found nowadays in Indonesia are lacking of bioactive components such as antioxidant and dietary fiber. One of famous snack types nowadays is snack bar. Not so many commercial snack bars are found in Indonesia. Most of them are imported product and expensive in price. In this research, snack bar made of local ingredients which contained bioactive compounds and dietary fiber was trying to be made. The local ingredients were from millet flour and okara flour. Millet is one type of cereals. Its common name is Pearl Millet (Pennisetum glaucum). Okara flour is one of the wastes from tofu production. Millet is the source of antioxidant and okara flour is source of fiber. Both of these ingredient are not used by people to be food raw materials. The other ingredients in this research were hunkue flour, sugar, skim milk, nutmeg fruit, and water. The aim of this research was to get the best formulation of snack bar based on organoleptic, antioxidant, and fiber analysis. The variables that were differentiated among formulas were ratio of millet and okara flour (1:1, 1:2, and 2:1) and fat source. Fat sources of these bars were palm oil and avocado. Six formulas were obtained from these two variables. Based on hedonic rating test, formula with palm oil obtained the highest score and the difference between flour ratios was not significant. The higher the percentage of additional flour okara, the level of total dietary fiber in product would be higher. Formula 1:2 using avocado had the highest fiber content (17,21%). However, formula 2:1 using palm oil had the highest antioxidant capacity (4,98 mg vitamin C equivalent per 100 gram product). The antioxidant activity was higher if the proportion of millet flour were higher in product. Based on the results, formula with the ratio of millet and okara flour= 1:2 was the best formula. The antioxidant capacity of that formula was 3,76 mg vitamin C equivalent per 100 gram product and the total fiber was 13,13%. This product contained water (12,5%), ash (1,7%), protein (12,65%), fat (22,8%), carbohydrate (62,86%), iron (64 ppm), zinc (16 ppm), and calcium (2308 ppm). The color of formula M1:2 were L= 61,12, a= +5,89, b= +2,86, and 0Hue= 77,23. The hardness level of the chosen snack bar millet-okara formula was 852 gram force.
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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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