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This study aimed to evaluate the effect of varying honey concentrations on the antioxidant activity, chemical properties, and organoleptic quality of a probiotic kombucha beverage prepared from Clitoria ternatea L. The research was motivated by increasing exposure to free radicals due to environmental pollution and the demand for alternative natural antioxidants. Kombucha was produced with honey concentrations of 10%, 20%, and 30% (w/v), and analyses were performed using the DPPH assay for antioxidant activity, measurements of pH, total acidity, and total phenolic content for chemical properties, as well as sensory evaluations by trained panelists. The results showed that kombucha with 10% honey exhibited the lowest IC₅₀ value, indicating the highest antioxidant activity, while higher concentrations increased the total phenolic content without significantly enhancing the effective antioxidant potential. These findings suggest that excessive honey addition does not necessarily improve the functional benefits of the product, indicating the need for further formulation optimization to develop a high-quality, marketable probiotic beverage.

Nanomaterials have a variety of uniqueness and attractiveness, it is considered necessary to carry out literature study, beside the laboratory investigation, among others, on the nanoparticle structure and energy gap of ZnO nanoparticles doped with aluminum (Al) resulting from synthesis using various methods. In this study, the structure of the nanoparticles was divided into three types, namely crystal structure, crystallite size, and morphology. The crystal structure of the Al doped ZnO nanoparticles is hexagonal wurtzite. It is found, that, a decrease in crystallite size occurs as the doping of Al into ZnO increases to its solubility limit. A similar pattern also occurs in particle size. The high concentration of Al doping results in agglomeration. The morphology of Al doped ZnO nanoparticles in some references of this study are rod, spherical, and irregular spheres. The energy gap value of Al doped ZnO nanoparticles increases with the increasing concentration of Al doping in ZnO. So, it can be said, that Al as a doping material has an influence on the structure and optical properties of ZnO nanoparticles.    

Pressure vessels are critical components in the energy industry, used to store and process high-pressure fluids. The structural reliability of these vessels plays a pivotal role in ensuring operational safety and system efficiency. This study aims to analyze the design and reliability of pressure vessels using both numerical and experimental approaches to optimize performance and enhance safety factors. The numerical method was conducted through Finite Element Analysis (FEA) using ANSYS software to evaluate stress distribution, stress concentration, and potential failure modes under various operational load scenarios. Meanwhile, the experimental method involved hydrostatic pressure testing, strain measurements using strain gauges, and displacement analysis to validate the numerical simulation results. Data were collected from simulations and laboratory experiments, then analyzed quantitatively by comparing key parameters such as stress distribution, deformation patterns, and safety factors against industry standards. The results indicate that combining numerical and experimental approaches improves the accuracy of pressure vessel behavior predictions, enables more efficient design optimization, and enhances structural reliability. In conclusion, the methods applied in this study can serve as a reference for developing safer, more efficient pressure vessel designs that comply with industrial standards, thereby supporting improved safety and operational efficiency in the energy sector.

This study aims to determine the effect of planting distance and concentration of liquid organic fertilizer on the growth and production of shallots (Allium ascalonicum L.). This study used a Randomized Block Design (RAK) with two treatment factors: planting distance and concentration of liquid organic fertilizer. The treatment factors are as follows: Factor I: Planting Distance (J) consists of 3 treatment levels: J1 = 15 cm x 15 cm; J2 = 20 cm x 20 cm, and J3 = 25 cm x 25 cm. Factor II: Concentration of liquid organic fertilizer (V) consists of 4 treatment levels, namely: V1 = 2 ml / 240 ml of water; V2 = 4 ml / 240 ml of water; V3 = 6 ml / 240 ml of water and V4 = 8 ml / 240 ml of water. Data analysis was done using variance analysis and Duncan’s test. The results showed that planting distance significantly affected the number of leaves, bulb diameter per sample, and fresh bulb weight per sample but had no significant effect on flowering age. POC concentration significantly affected flowering age, tuber diameter per sample, and fresh tuber weight per sample but did not significantly affect plant height and number of leaves. The interaction between planting distance and POC concentration did not significantly affect all observed parameters.

One of the negative impacts of the mining process is acid mine drainage which is formed from the oxidation of minerals containing iron sulfur, such as pyrite (FeS2) and pyrothite (FeS) by oxidizers such as water and oxygen. To handle or control acid mine drainage, one way is to use activated carbon or often referred to as activated charcoal, which is a type of carbon that has a very large surface area. Charcoal is a porous solid that contains 85% to 95% carbon, produced from materials containing carbon by heating at high temperatures without oxygen (pyrolysis). Activated carbon made from palm shells is an adsorbent that can be used to treat coal mine acid water, so that the water meets standards for flowing into the environment. This study used concentration variants of 4 grams, 6 grams, 8 grams and contact times of 30 minutes, 60 minutes and 150 minutes. The results of this study show that the concentration of palm oil shell activated carbon adsorbent influences the reduction of iron (Fe) and manganese (Mn) metal levels as well as the pH conditions in acid mine drainage water. The higher the concentration and the longer the contact time, the more heavy metals are adsorbed, the contact time is the highest. The optimal concentration in this study was 150 minutes and the optimal concentration was 8 grams with physical activation.

This study aims to determine the effect of soaking time and coconut water concentration on the dormancy breaking of oil palm seeds (Elaeis guineensis Jacq.). This study used a Factorial Completely Randomized Design with two factors. The first factor is the concentration of coconut water (A): A1 = 25% coconut water/liter of water, A2 = 50% coconut water/liter of water, and A3 = 75% coconut water/liter of water. The second factor is the soaking time (L): L1 = 30 minutes, L2 = 60 minutes, and L3 = 90 minutes. Data analysis was conducted using variance analysis and Duncan's test. The results showed that the concentration of coconut water significantly affected germination power, germination age, plant height, and the number of leaves of oil palm seedlings. A 75% concentration of coconut water produced the best dormancy breaking of oil palm seeds. The soaking time in coconut water solution also significantly affected germination power, germination age, plant height, and the number of leaves of oil palm seedlings. A soaking time of 90 minutes resulted in the best dormancy breaking of oil palm seeds. The interaction between coconut water concentration and soaking time significantly affected the germination power of oil palm seeds. This study provides important information on the optimal soaking conditions to improve dormancy breaking success, which can be used to accelerate the germination and growth of oil palm seedlings.

Fungal infections, such as those caused by Curvularia, can interfere with the vegetative growth and reduce the quality of oil palm seedlings, particularly in the main nursery phase. One solution to improve resistance to pathogens and support vegetative growth is by applying the right foliar fertilizer. This study aimed to determine the effect of Kenfolan foliar fertilizer application on vegetative growth and the level of Curvularia infection in oil palm seedlings during the main nursery phase. The study used a Completely Randomized Design (CRD) with five treatments of Kenfolan fertilizer concentrations: 0 ml/L (P1), 1 ml/L (P2), 2 ml/L (P3), 3 ml/L (P4), and 4 ml/L (P5), each repeated three times. The parameters measured included seedling height, stem diameter, number of fronds, and the percentage of Curvularia infection. Data analysis was performed using ANOVA followed by Duncan’s Multiple Range Test (DMRT) at a 5% significance level. The results showed that treatment P4 (3 ml/L) provided the best vegetative growth, with seedling height reaching 40.07 cm, stem diameter of 1.58 cm, and an average of 4.25 fronds. Additionally, treatments P3 (2 ml/L) and P4 (3 ml/L) successfully suppressed Curvularia infection, with no infection found in these treatments. In contrast, treatment P1 (control) showed the highest infection level of 33%, while P5 (4 ml/L) increased the infection compared to P3 and P4. Based on the results, the application of Kenfolan foliar fertilizer at a dose of 3 ml/L (P4) was the most effective in improving vegetative growth and suppressing Curvularia infection in oil palm seedlings in the main nursery phase.

This study aims to improve the numeracy skills of early childhood through the use of number card games. Numeracy is one of the basic competencies that is important to develop as a foundation for future mathematics skills. The method used in this study is game-based learning, where children are involved in interactive and fun number card playing activities. The subjects of this study were children aged 5-7 years at RA Al Busyro Ngimbang. The results of the study showed that the use of number card games can significantly improve children's numeracy skills, especially in the aspects of number recognition, addition, and simple subtraction. This game helps children understand basic mathematical concepts more naturally and without pressure, because the learning process is carried out in a fun and informal atmosphere. In addition, number card games can also increase children's motivation in learning mathematics, improve social skills through interaction with peers, and improve concentration and focus during the learning process. The conclusion of this study shows that number card games can be used as an effective learning strategy to improve the numeracy skills of early childhood. It is recommended for educators and parents to utilize this method in order to develop children's mathematical abilities more optimally.

"Isi Piringku" is a dietary guideline developed by the Ministry of Health of the Republic of Indonesia as part of a balanced nutrition campaign. Understanding this concept is particularly important for elementary school-aged children, as this is a critical period for physical growth, mental development, and the formation of healthy lifestyle habits. A balanced nutritional intake plays a vital role in improving learning concentration, supporting physical activity, and preventing various diseases caused by nutritional deficiencies or excesses. However, the dietary behavior of elementary school students remains far from balanced nutrition principles, with an average achievement of only 53.9%. Based on this condition, this Community Service Program (PkM) aimed to improve the knowledge, skills, and behavior of Youth Red Cross (PMR) members at SDN Krapyak in consuming food according to balanced nutrition guidelines using the “Isi Piringku” media. The activities carried out included obtaining permission, conducting socialization, training on the use of the “Isi Piringku” media, and providing ongoing mentoring. Through this program, it was expected that PMR members could become change agents and role models for their peers in implementing healthy and balanced eating habits. The results of the activity showed that the mentoring was successfully conducted. There was a significant improvement in the knowledge and skills of PMR members, as reflected in the increase in the average score from 70.8 to 90.97 after the intervention. This indicates that the approach using the "Isi Piringku" media is effective in promoting balanced nutritional behavior among elementary school children.

"Isi Piringku" is a dietary guideline developed by the Ministry of Health of the Republic of Indonesia as part of a balanced nutrition campaign. Understanding this concept is particularly important for elementary school-aged children, as this is a critical period for physical growth, mental development, and the formation of healthy lifestyle habits. A balanced nutritional intake plays a vital role in improving learning concentration, supporting physical activity, and preventing various diseases caused by nutritional deficiencies or excesses. However, the dietary behavior of elementary school students remains far from balanced nutrition principles, with an average achievement of only 53.9%. Based on this condition, this Community Service Program (PkM) aimed to improve the knowledge, skills, and behavior of Youth Red Cross (PMR) members at SDN Krapyak in consuming food according to balanced nutrition guidelines using the “Isi Piringku” media. The activities carried out included obtaining permission, conducting socialization, training on the use of the “Isi Piringku” media, and providing ongoing mentoring. Through this program, it was expected that PMR members could become change agents and role models for their peers in implementing healthy and balanced eating habits. The results of the activity showed that the mentoring was successfully conducted. There was a significant improvement in the knowledge and skills of PMR members, as reflected in the increase in the average score from 70.8 to 90.97 after the intervention. This indicates that the approach using the "Isi Piringku" media is effective in promoting balanced nutritional behavior among elementary school children.

Global climate change has caused changes in rainfall patterns in various regions, including North Jayapura District, Papua Province. This study aims to analyze changes in rainfall characteristics in the region over the past two decades (2004–2023) using GSMaP satellite data. The analysis was carried out on the average monthly rainfall, annual rainfall, decadal trends, hourly rainfall intensity frequency, and daily rainfall duration. The results showed a decrease in annual rainfall accumulation in the 2014–2023 decades compared to the previous decade (2004–2013), with a difference of around 5,000 mm. The seasonal rainfall pattern still shows concentration in January to March, but with a significant decrease in these wet months. In addition, there was an increase in the frequency of short-duration rain (<1 hour) and moderate to very heavy rain, although the frequency was still relatively small. The high variability of annual rainfall also indicates an increasingly large climate. These findings indicate that North Jayapura District faces the risk of increasing extreme rainfall events and decreasing water availability in the long term. Therefore, adaptation efforts are needed through improving early warning systems, conservation of air catchment areas, and integration of satellite data and field observations in air resource management planning.

Sunlight is the main source of energy for life, but ultraviolet radiation can have negative impacts on the skin, such as sunburn, pigmentation, wrinkles, premature aging, and the risk of skin damage due to excessive exposure. One way to protect the skin from these effects is to use sunscreen. Carrots contain antioxidant compounds that can bind free radicals and prevent cell damage due to oxidation, so they have the potential to be used as a natural ingredient in making sunscreen. This research aims to formulate and test the physical properties of carrot extract lotion as a sunscreen and determine the extract concentration that has the optimal Sun Protection Factor (SPF) value. The method used is experimental by making lotion formulations, testing their physical properties, and measuring the SPF value of each formulation. The research results showed that the KN, F1, F2, and F3 lotion formulations had a semi-solid form which met the formulation requirements. However, KN's SPF value is only 1.23 which does not meet sunscreen standards. Meanwhile, F1 has SPF 8.3 (extra effect category), F2 with SPF 15.06 and F3 with SPF 24.1 (ultra category). F3 shows the best results because with SPF 24.1, this formulation is close to SPF 25 which can protect the skin for up to 4 hours with twice daily use. The higher the concentration of carrot extract, the better its effectiveness in lotion formulation as a sunscreen.

Digital literacy plays an important role in the psychological development of elementary school children, both from cognitive, social, and emotional aspects. This study aims to analyze the influence of digital literacy on child psychology by highlighting the positive and negative impacts it causes. The research method used is a literature review with reference to various previous studies on digital literacy and its development in children. The results of the study show that digital literacy can improve critical thinking skills, creativity, and expand children's social interactions. In addition, access to technology can also help children understand the world more broadly and increase empathy for social issues. However, excessive use of digital technology without adequate supervision can have negative impacts, such as addiction to gadgets, decreased social interaction, and impaired concentration in learning. Exposure to age-inappropriate content and the risk of cyberbullying are also threats to children's mental health. Therefore, an active role of parents, educators, and policymakers is needed in supervising and guiding children in using digital technology wisely. This study confirms that digital literacy has a complex impact on child psychology. With proper guidance and supervision, the benefits of digital literacy can be optimized, while the negative impact can be minimized. Therefore, a balanced approach in the application of digital literacy is needed to support the optimal development of children's psychology.

Math phobia is a psychological disorder characterized by excessive fear of mathematical concepts or activities, which hinders students' learning process. This study aims to explore the use of the abacus method as an intervention in improving mental arithmetic and reducing math phobia in elementary school students. The abacus method, which has been proven effective in improving concentration and mental arithmetic skills, is integrated into learning to provide an interactive and fun learning experience.  This study used a descriptive qualitative method involving 15 students and the third grade teacher of SDN 19 Tarung-Tarung, and used data collection techniques in the form of observation, interviews, and documentation. Data analysis used the Miles & Huberman research model. The results showed a significant increase in mental arithmetic skills and a decrease in students' anxiety levels in math subjects, which had a positive impact on students' learning motivation. The application of the abacus method can be an alternative strategy in designing more effective mathematics learning interventions to overcome math phobia.

In the curcumin compound there are aromatic compounds that have electronic spins on each side of the benzene. In previous research, the concentration of curcumin and H2O as coatings on copper coils could provide physical changes to the characteristics of copper coils, namely increasing the strength of the magnetic field and increasing the electric current in the coil. The fuzzification process can be described using membership variables with concentrations of curcumin and H2O as input, magnetic field strength and current as output. It is known that the greatest concentration of curcumin indicates increased magnetic field strength and electric current. Simulation of the aromatic spin on the curcumin compound as an Op Amp shows that the highest curcumin concentration value results in an increase in the output voltage (Vout).                                                                                                

Vannamei shrimp is one of the shrimp species with economic value and is one of the national leading commodities. On the other hand, one of the problems in vannamei shrimp cultivation is its slow growth, slow growth is caused by the less optimal absorption of nutrients in the feed. In dealing with these problems, one of the things that is done is the administration of probiotics. The addition of probiotics such as Biolacto containing Lactobacillus sp bacteria to the feed can increase the appetite of shrimp. This study aims to determine the effect of biolacto probiotics on feed on the growth of the absolute weight of vannamei shrimp. This study used a Complete Random Design (RAL) with four treatments: A (feed without a mixture of probiotics), B (probiotics 2 gr/100 gr feed), C (probiotics 4 gr/100 gr feed), and D (probiotics 6 gr/100 gr feed). Treatment B with a concentration of probiotics 2gr/100g feed gave the highest absolute weight growth of 9.2 gr. Water quality data during the study were obtained with water temperature ranging from 28.5 – 29.2°Celsius, salinity ranging from 36 – 37 ppt, pH ranging from 7.5 – 8.0, and dissolved oxygen ranging from 4.0 to 4.63 mg/l. The results of the ANOVA analysis of the four water quality parameters showed no difference between treatments and were in the optimal range of life of vannamei shrimp (Litopenaeus vannamei).

Ferritin is considered a protein that contains iron and includes two types of subunits: ferritin light chain (FTL) and ferritin heavy chain (FTH), which increases when inflammation increases, especially in the heart and kidneys, and helps in converting ferrous iron into iron. The light subunit is present in the liver and spleen and has a role in storing iron (1). Coronavirus (COVID-19) caused by the new coronavirus SARS-CoV-2 is a disease It is new to humanity, as it is accompanied by symptoms during the disease, including blood abnormalities, with activation of the immune system and phagocytic monocytes, and damage to the lungs. In our study, we showed that ferritin is an indicator of the severity of the disease and mortality (2). Acute respiratory syndrome (Coronavirus), which causes pneumonia and damages the heart, liver, and kidneys, is caused by the appearance of acute inflammatory cytokines that lead to death (3). A cytokine is a small protein that transmits messages to help stimulate the body’s immune response, and its rise causes increased inflammation, and these Cytokines secreted by macrophages (TNF-α, IL-10, IL-6) where there is high inflammation in the plasma. An indicator of the progress and severity of the disease (3).

Diabetic ketoacidosis (DKA) is defined as life threatening condition that happen mainly in T1DM and less frequently with T2DM in certain situation, an increase in the serum concentration of ketones greater than 3 mmol/L, a blood sugar level greater than 11mmol/L (although it is usually much higher), and a blood (usually arterial) pH less than 7.3 and it is the most frequent acute hyperglycemic emergency in persons with diabetes mellitus (DM). The main cause of morbidity and mortality in children with diabetes is DKA from both type1 DM (T1DM) and T2DM. Children with diminished metabolic control or previous episodes of DKA are at higher risk, as are prepubescent and adolescent girls, children with psychiatric disorders, such as eating disorders, and children who come from challenging families with lower socioeconomic status and inadequate health insurance as well as low general education levels.

One of the districts with the greatest concentration of ethnic Chinese residents and the highest concentration of young business owners in Medan City is Medan Kota District. The purpose of this study is to clarify the potential impact of ethnic Chinese youth's independent enterprises on labor absorption in Medan Kota District. A quantitative descriptive research design is employed, and SPSS version 17 analysis is used to perform the Multiple Linear Regression research method. Ho was rejected while Ha was accepted, according to the ANOVA test, which revealed that Fcount> Ftable. This indicates that ethnic Chinese youth-owned independent enterprises significantly improve labor absorption, specifically 72%.

Ready-to-drink (RTD) chocolate beverages are increasingly popular, yet traditional formulations often contain dairy components while some consumers are lactose intolerance. The primary challenges in RTD chocolate beverages include achieving acceptable flavor profiles and managing cocoa powder precipitation. This study aimed to formulate a non-dairy ready-to-drink chocolate beverage using a hedonic test and  enhance its physical stability through varied xanthan gum concentrations applying Completely Randomized Design (CRD).A hedonic test involving 30 untrained respondents determined the most preferred formula with the highest preference level (3.7), which consisted of 40% local cocoa powder from Kulon Progo, Yogyakarta, 15% commercial cocoa powder, and 45% castor sugar. Stability analysis involved incorporating xanthan gum at concentrations of 0.1%, 0.15%, and 0.2% (w/v). Results demonstrated that 0.2% xanthan gum concentration yielded the highest viscosity (98 N.s/m²), significantly differing from the control. The lowest precipitation was observed at 0.2% concentration (p-value 0.048). Particle size analysis revealed progressive reduction from 21 μm to 5 μm with increasing xanthan gum concentration. The study conclusively identified 0.2% (w/v) xanthan gum as the most effective concentration for improving chocolate beverage stability, offering a promising approach for developing innovative, dairy-free RTD products.