Judul: Status Hidrasi Remaja dan Kaitannya dengan Daya Ingat Sesaat
Abstrak: This research was aimed to study the relationship between hydration statusof teenagersand short term memory capacity. This study used experimental design. The subjects in this study were 90 students, consisted of 45 students as control and 45 students as intervention groups. Research was conducted in one Junior High School named SMP Pangerasan, Cijeruk Subdistrict, District of Bogor. On the day of research implementation, the whole subjects had breakfast together at 7.00 a.m. at the school. Breakfast menu consisted of sandwich with cheese, chocolate and milk. The nutrient contents of food were 330 Kcal energy, 12 g protein and sufficient amount of water. Previously, the subject was also asked not to consume anything from home. Furthermore, the subject was asked not to consume any kind of food and drinks until 12 p.m. At 12.00p.m.the intervention groupwasgiven drinking water until the subject satisfied, and followed by measurements of the short memory capacity starting 5 minutes later.At the same time, memory capacity of the control group were measured without giving any kind of drink. The results of the study showed that hydration status most of the subjects (78%) were on the level 2. Out of six words tested, the number of words memorized by intervention group were 3.26 ±0.85, while for control group were 2.04±0.29. Memory capacity for pictures in intervention group was 3.51±1.05 while in control group was 3.11±1.15. Spearman test showed significant correlation(p<0.05) between hidration status and short term memory capacity.
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Judul: Analisis Densitas Energi Konsumsi dan Status Gizi serta Pengaruhnya terhadap Daya Ingat Sesaat
Abstrak: The aim of this study was to analyze the correlation between dietary energy density, nutritional status and influence towards Bogor elementary students’s short term memory. Design of this study is cross sectional study with purpossive sampling 111 elementary school students in Bogor. Children’s allowance, parents educational background and income, nutritional knowledge, food consumption, physical activity and short term memory were analyzed by chi square and logistic regression. The results showed that most of student consumed high energy density with average of dietary energy density was 2,13 kkal/g for girls and 1,98 kkal/g for boys. Children’s allowance and mother’s educational were variabels that had significant correlation with dietary energy density. Most of them had normal nutritional status but 27% of them were overweight and obese. Nutritional knowledge and breakfast habit were variabels that had significant correlation with nutritional status. Only nutritional knowledge and nutritional status that has significant influence towards their short term memory
Keyword: elementary school student, short term memory, nutritional status, dietary energy density

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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