Judul: Penyelenggaraan Makanan, Tingkat Konsumsi Dan Analisis Preferensi Atlet Di Sma Negeri Ragunan Jakarta
Abstrak: The appropriate of nutrition is a main basic for athletes to perform their ability in a competition. SMA Negeri Ragunan Jakarta is one of the institution that provides any training programs of some sports. This institution supplies foods every day to the athletes. The objective of this research is for knowing the role of food organization system, the consumption level of energy and macronutrients, and also the preference of the athletes in SMA Negeri Ragunan Jakarta. The research was conducted by using analytic descriptive design from April to May 2009. Samples was chosen with the purposive sampling. The amount of sample is 40 athletes, divided into 5 athletes of archery, 12 athletes of volley, 11 athletes of swimming and 12 athletes of atlethic. The food organization system in SMA Negeri Ragunan Jakarta have required the standard of food organizer. The food organization system have worked well. More than half of samples (67.5%) have deficit in the level consumption of energy. Almost of samples (62.5%) consumed protein between 66.7 and 100 percent (adequate). Most of samples (77.5%) consumed fat less than 20 percent and 97.5 percent of samples consumed carbohydrate more than 70 percent. Research shows that the time dividing have a correlation with the level of energy consumption. The level of energy consumption increase when the meal divides in a appropriate time. The appropriate of time serving and cleanness of canteen have significantly positive correlated with the level consumption of energy
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Judul: Hubungan antara karakteristik atlet, tingkat kecukupan gizi, dan status gizi dengan tingkat kebugaran atlet sepakbola di SMA Ragunan Jakarta Selatan
Abstrak: Football game is one of the most popular sport in the world. This game requires the endurance of the heart-lung capacity both to desaibe the activity continuously with a Jong time without experiencing fatigue. One efforl to obtain physical endurance (fitness level) is a good nutrition in accordance with the needs of athletes that can be adequate nutnents to perform activities. Nutnent intake according to the needs of football athletes are able to make an athlete has a normal nutritional status that will have a good level of fitness. This study aims to determine characteristics of athletes, level of nutritional adequacy, nutritional status, and fitness level of football athletes in SMA Ragunan, South Jakarta. The study was conducted in May to June 2009 by using cross-sectional study design. The number of samples is 22 football athletes selected by using purposive sampling. The data obtained were analyzed using Pearson product moment corellation test, Spearman core//ation test, and ANOVA test The results of this study include statistical tests between the characteristics of athletes with fitness level (VO2 max) is there no relationship between the age of football athletes with fitness level (VO2 max) (p> 0.05, r = 0187), ANOVA test results showed there was no real difference between the position of athletes playing football with fitness level (VO2 max) (p> 0.05), and there is no relationship between body fat percentage with fitness level (VO2 max) (p> 0.05, r = 0401). For statistical test between nutritional status with fitness level (VO2 max) is there is no relationship between the nutritional status of fitness level (VO2 max) (p> 0. 05, r = -0275). For statistical test between the level of nutritional adequacy with fitness level (VO2 max) is the relationship between the level of energy sufficiency by fitness level (VO2 max) (p <0.05, r = 0472). Based on the results of this research can be seen that the level of adequacy of energy has an imporlant relationship with a fitness level that is recommended to maintain adequate nutrition (energy) athletes by consuming food sources of energy and protein. In addition, football athletes should increase the consumption of food containing other nutnents and supplement such as calci_um, iron, vitamin A, vitamin C, and vitamin B which has an important role in energy metabolism.
Keyword: Level of adequacy of energy, Fitness level, VO2 max

Judul: Bifurkasi Hopf pada siklus bisnis IS-LM tanpa dan dengan waktu tunda
Abstrak: One of business cycle models in dynamical economics is the IS-LM business cycle model with time delay, where the time delay lies in stock capital variables. It is a time delay between the existence of stock capital and the time to get ready to invest. In a model without time delay, changing the parameter of investment rate on income could affect the system stability. On the other hand, in a model with time delay, there exists critical time delay changing the system stability. This shows limit cycle, which can be concluded that Hopf bifurcation occurs
Keyword: Bogor Agricultural University (IPB), time delay, Hopf bifurcation, business cycle model