Global energy sources are being transformed from hydrocarbon-based energy sources to renewable and carbon-free energy sources such as wind, solar and hydrogen. The biggest challenge with hydrogen as a renewable energy carrier is the storage and delivery system’s complexity. Therefore, other media such as ammonia for indirect storage are now being considered. Research has shown that at reasonable pressures, ammonia is easily contained as a liquid. In this form, energy density is approximately half of that of gasoline and ten times more than batteries. Ammonia can provide effective storage of renewable energy through its existing storage and distribution network. In this article, we aimed to analyse the previous studies and the current research on the preparation of ammonia as a next-generation renewable energy carrier. The study focuses on technical advances emerging in ammonia synthesis technologies, such as photocatalysis, electrocatalysis and plasmacatalysis. Ammonia is now also strongly regarded as fuel in the transport, industrial and power sectors and is relatively more versatile in reducing CO2 emissions. Therefore, the utilisation of ammonia as a renewable energy carrier plays a significant role in reducing GHG emissions. Finally, the simplicity of ammonia processing, transport and use makes it an appealing choice for the link between the development of renewable energy and demand.

Indonesia has the fifth-highest level of stunting in the world. Stunting was the most severe problem that was impeding child growth and development. This study aims to determine the relationship between the characteristic of the mother with the incidence of stunting in under-five children (24-59 months) in North Sumatera in 2013 This study, we took data from the 2013 Indonesian National Basic Health Survey (RISKESDAS), with a sample of 573 children. For this study, Data were collected using a questionnaire and processed using Chi-square test (α=0.05). Variables that are used include mother's age, height, education, and occupation. The result reveals that prevalence of stunting among children is 40.3%. Prevalence of mother's height in category 150-155 cm is 35.6%. Most of the mother in this research at 24-35 years old (65.4%), higher education (86.4%), and has no fixed monthly income (80.1%). Chi-square test results showed mother's height, education and occupation were connected with stunting. The result of multivariate analysis showed that the variable which had the most dominant influence as the determinant of the incidence of stunting was mothers' education (OR = 1.9; 95% CI 1.188-3.133; p=0.08), It is suggested that families to the family (parents) to pay attention to education, especially for girls.

Malay apple (Syzygium malaccense L.) is a plant that can be used for treatment. Antioxidants have the activity to reduce free radical compounds which is one of the causes of the emergence of various diseases in humans. The purpose of this study to determine the comparison of methods of maceration and socletation extraction of antioxidant activity of malay apple leaf. Research stages include sampling, plant determination, making of simplisia, maceration extraction and socletation with 70% ethanol solvent and determine the antioxidant activity by UV-Vis spectrophotometry with DPPH (1,1-diphenyl-2-picrylhydrazyl) as free radical. The parameter is IC50 value that is the concentration of antioxidant compound which can cause 50% loss of DPPH free radical activity. Although both methods show very strong antioxidant activity, it can be concluded that the difference in extraction methods has an effect on the antioxidant activity produced. The results of antioxidant activity test showed that socletation methods gave an average IC50 value of 37.67 ppm, this value is higher than maceration methods with an average IC50 value of 47.80 ppm. Malay apple leaf has the potential as a natural antioxidant, although it has a lower IC50 value than vitamin C which is 9.72 ppm.

Physical Fitness is the ability to do daily activities easily, without getting tired excessive, and has a power reserve to rest. VO2max is a main factor for athletes in order to get a good performance. This study aims to determine the relationship of energy intake, macro and micro nutrients to physical fitness of athletes of Dyva Taekwondo Centre Cibinong. This study used cross sectional design research. The number of respondents was 30 athletes determined by total sampling. The consumption energy and macronutrients were measured by 3x24 hour recall method, whereas intake of micronutrients data was obtained using semy FFQ. Variable relationships were tasted using Pearson Correlation. The result showed that the average age of respondents was 14±1 years, energy intake 2259±571 kkal, protein 73±15 g, fat 51,7±8,9 g, carbohydrate 259±57 g, vitamin B1 1,15±0,4 mg, vitamin C 230±81,7 mg, fe 21±4,5 mg and fitness level 35,69±7,2 kg/ml/minute. There was relationship of energy intake (p= 0,0001), carbohydrate (p=0,0001), vitamin C (p=0,0001), fe (p=0,007 and fitness level. There was no correlation between fat intake, protein, vitamin B1 and fitness level (p=0,081, p=0,497, p=0,383).  Intake of energy, carbohydrate, vitamin C, and fe does relate to physical fitness of athletes of Dyva Taekwondo Centre Cibinong. Athletes are advised to consume food according to their daily needs in order to maintain their fitness therefore, they can achieve optimal performance.

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