Publication Search

Increasing in energy demand and limited fossil fuel reserves have driven the use of environmentally friendly alternative energy sources. This study aims to analyze the effect of pyrolysis temperature variations on the quality of biopellets made from bagasse and coffee husks. The materials were prepared in a 50:50 ratio with the addition of 15% tapioca flour as a binder. The pyrolysis process was carried out at temperatures of 450°C, 500°C, and 550°C for 120 minutes in oxygen-free conditions. The biochar resulting from pyrolysis was formed into biopellets, which were then tested for proximate composition, calorific value, and combustion rate. The results showed that an increase in pyrolysis temperature had a significant effect on the characteristics of the biopellets. A temperature of 550°C produced the lowest moisture content (8.436%), the highest fixed carbon content (62.191%), the highest calorific value (6293 cal/g), and the highest combustion rate (0.05789 g/sec). Conversely, ash content increased with rising temperature, while volatile matter content decreased. Thus, the best biopellets were obtained at a temperature of 550°C. This study confirms the potential of bagasse and coffee husks as raw materials for biopellets through pyrolysis temperature optimization to support the development of sustainable biomass energy.

Overburden removal at Pit B did not meet the production targets for June and July 2025, which were set at 570,698.8 BCM and 400,986.56 BCM, respectively, while the actual production achieved was 507,071.66 BCM and 312,128.23 BCM. This study aims to determine the theoretical productivity of loading and hauling equipment and to identify the factors that hinder the achievement of production targets. The primary data used in this study include the cycle time of loading equipment, the cycle time of hauling equipment, bucket fill factor, and delay time. The secondary data required consist of swell factor, number of passes, bucket capacity, and available working time. The productivity of the loading equipment was 332.58 BCM/hour, while the hauling equipment achieved a productivity of 53.16 BCM/hour, with a match factor of 0.74. This indicates that the loading equipment experienced waiting time during loading operations due to the hauling equipment not operating optimally or at full capacity. The factors inhibiting the achievement of production targets include a narrow, waterlogged, and uneven working face; hard overburden material; a road grade of 16%, which exceeds the standard maximum of 12%; a curve road width of 15 m, which is less than the ideal minimum width of 19.95 m; undulating haul roads; narrow haul road width; and dusty road conditions.

L House is a house design that is shaped like the letter "L". This distinctive configuration offers flexibility in spatial arrangement and creates an interesting interaction between interior and exterior areas. L House by 022Studio is a work that combines modern aesthetics with traditional values and sustainability. Through a descriptive criticism method involving interviews with architects, literature studies, and analysis of design elements, this study aims to reveal the strengths and challenges in the application of modern design in a tropical context. L House successfully integrates space with nature through the use of local materials, flexible spatial layouts, and building orientations that optimize natural lighting and ventilation. In addition, this design also makes a significant contribution to the development of modern architecture in Indonesia by demonstrating that modern buildings can be adapted to local cultural and environmental contexts. L House is a good example of sustainable architecture that can inspire similar projects in the future.

The problems encountered are damage to the rubber wheel mount and universal/cross joints on the 90 m/hour capacity wood profile making machine, which can affect the uniformity and speed of wood profile making. Maintenance and repair planning aims to be able to create a maintenance and repair schedule for the 90 m/hour capacity wood profile making machine for the period 2026, estimate maintenance costs and the ratio of maintenance and repair costs to machine profits. The maintenance planning method includes collecting maintenance data from previous maintenance periods, reviewing the specifications of the wood profile making machine, estimating the age and price of components that are estimated to be damaged, estimating the cost and duration of dismantling and installing components that have been repaired in accordance with the provisions of the requirements for usable components or replacement spare parts, scheduling maintenance and repairs, estimating maintenance and repair costs for the period 2026, and determining the ratio of maintenance costs to profits. The planning results in the form of a maintenance-repair schedule for the period 2026; maintenance and repair costs in 2026, the ratio of maintenance costs to profits, and their implications indicate that the machine is still prospective and usable.

Gastric disease is a common health problem that can disrupt daily activities if not properly treated. To aid the initial diagnosis process, this study developed a web-based expert system capable of diagnosing various types of gastric disease based on the symptoms experienced by the user. This system uses the Dempster-Shafer method to address uncertainty in decision-making by combining a number of pieces of evidence in the form of symptoms to determine the level of confidence in a disease. The system was developed using the PHP programming language and a MySQL database and designed for easy browser access. Testing demonstrated that the system was able to provide fairly accurate diagnostic results that closely approximated the results of consultations with medical professionals. This system is expected to become an initial solution for the public in quickly and independently recognizing symptoms of gastric disease.  

Brake discs are one of the motorcycle spare parts that function to connect and reduce speed when the motorbike is moving, although very simple, this spare part is part of the braking system and has a very important role, without braking it will endanger the driver and other road users. To determine the hardness of the motorcycle brake disc on two original brake discs and variation brake discs on the Yamaha Vision sport motorbike by conducting Rockwell hardness tests on the original and variation brake discs with 10 test variable points. The results obtained for the average value at the level of hardness on the original disc sample are 55.1 HRC and the average value on the variation disc sample is 44.6 HRC, and the conversion hardness value from the Rockwell test. For Brinell testing and tensile testing from the results of Rockwell hardness testing, the average Brinell and tensile test values ​​were converted from the test site with the average Brinell conversion results for the original disc being 575 HBS, while the average variation disc value was 417.1 HBS, the conversion tensile test value with the results on the original disc was 1626 N/mm² and the variation disc was 1427 N/mm² with 10 variable point Rockwell testing and the conversion value of the Brinell hardness test and the original disc tensile test value was still greater than the variation disc tensile test value.

The instability of the climate is becoming increasingly prominent across Southeast Asia, creating uncertainty in agricultural systems that are highly dependent on seasonal weather patterns. Indonesia, where rice remains the primary staple food, is particularly vulnerable to the effects of rising temperatures and rainfall deficits. This study applies the Seasonal Autoregressive Integrated Moving Average (SARIMA) model to predict rice production while incorporating indicators of extreme climate anomalies. Using publicly available datasets, including FAOSTAT production statistics, NOAA rainfall and temperature anomalies, and climate indices from the World Bank, this model was developed following the Box-Jenkins procedure. Among the configurations tested, the SARIMA model (1,1,1)(0,1,1)₁₂ showed the strongest performance, reflected in a MAPE of 4.62% and low RMSE values. The model indicates that significant El Niño events can reduce annual rice production by 3–7%, while wetter La Niña conditions may support production recovery. These findings highlight the importance of integrating climate-sensitive data into agricultural forecasting. The model presented here could support early warning systems, adaptive farming strategies, and long-term food security planning in Indonesia.

Pepper is currently not only used to meet daily needs but also as an export commodity. Indonesian pepper exports generate foreign exchange for the country. Currently, international competition for pepper exports is increasingly fierce. An evaluation of the level of market competition and the structure of the pepper market at the international level is necessary. The methods used to analyze the level of competition concentration and market structure are the Concentration Ratio of Biggest Four (CR4) and the Herfindahl-Hirschman Index (HHI). The types of pepper discussed in this study are white pepper with HS code 090411 and black pepper with HS code 090412. The results obtained indicate that both black and white pepper tend to be in an oligopoly market structure with a relatively high level of competition. Such market conditions are a distinct advantage for Indonesia, as there are not too many competitors while buyers or enthusiasts are quite high. A striking difference occurs in the international black pepper trade. In the black pepper trade, Indonesia is not classified as a country with the largest market share.

Examining how well college students grasp the concept of gender equality is the primary goal of this research. In order to achieve social justice and provide equal opportunity for all people, regardless of their gender, gender equality must be upheld. But there are still attitudes and actions that show gender disparity in the classroom. Students from different academic programs filled out questionnaires that were part of a descriptive quantitative research. The majority of pupils had a solid grasp of gender equality or its significance in the classroom, according to the data. Nevertheless, several respondents did not provide very detailed assessments of campus initiatives promoting gender equality.

Education functions as a central pillar in shaping the quality of human capital, encompassing knowledge, skills, and health, and thus plays a significant role in influencing Indonesia’s Human Development Index (HDI). This study employs a qualitative literature review by examining key theoretical frameworks in the economics of education, such as Becker’s Human Capital Theory and Schultz’s investment model, supported by relevant national empirical data. The findings indicate a very strong relationship between education and HDI improvement. This is reflected in a correlation coefficient of 0.943 between education expenditure and Indonesia’s HDI during the 2004–2023 period. The results suggest that an increase in education spending of IDR 1 trillion has the potential to raise the HDI by approximately 0.002 points. These findings confirm that investment in education not only enhances the quality of human resources but also directly contributes to sustainable national development. Despite the positive trend and the achievement of an HDI score of 75.02 in 2024, several challenges persist, particularly regional disparities, unequal access to education, and quality gaps between urban and rural areas. Therefore, more inclusive education policies, equitable access, and strengthened vocational education and training are essential to ensure that the benefits of human capital development are distributed evenly across all regions of Indonesia.

Pancasila as the foundation of the state and the national ideology of Indonesia, has a very important function in shaping the moral values, ethics, as well as the attitudes and behavior of state officials. However, the reality of the persistent prevalence of corruption cases reflects a gap between the values contained in Pancasila and the practices of national and state life. This article aims to examine the implementation of Pancasila values in efforts to prevent and address corruption cases in Indonesia. The research method used is a qualitative approach with a literature review method, conducted through an examination of laws and regulations, scientific journals, and various relevant literary sources. The discussion results show that each principle of Pancasila contains anti-corruption values, such as belief in God that instills honesty, humanitarian values that uphold justice, the value of unity that rejects the interests of certain groups, democratic values that emphasize trustworthiness, and the value of social justice for all Indonesian people. However, the implementation of these values has not been carried out optimally due to weak law enforcement and low moral awareness. Therefore, efforts are needed to strengthen Pancasila education, improve the integrity of state officials, and build a collective commitment to realize clean and just governance.

Constructivism learning theory places learners as active subjects in constructing knowledge through learning experiences, social interactions, and reflection on their surroundings. This approach views learning not as a passive process of receiving information, but as an active process of constructing meaning based on the prior knowledge possessed by learners. This paper aims to comprehensively examine the development and definition of constructivist learning theory, its main principles and characteristics, and its implications in the learning process, particularly in the context of primary education. The writing method used is a literature study by analyzing various literature sources in the form of textbooks, scientific journal articles, and other relevant references related to constructivism theory. The results of the study show that constructivist learning emphasizes learner-centered learning, where knowledge is not transferred directly by the teacher but is constructed through a process of assimilation and accommodation. In this approach, teachers act as facilitators who design a conducive learning environment so that students are able to build understanding independently and through social interaction. The application of constructivist learning has been proven to encourage the development of critical thinking, problem solving, cooperation, and meaningful learning. Therefore, constructivist learning theory is relevant to be applied in modern learning as an effort to improve the quality of the learning process and outcomes of students.

Parents act as early educators entrusted with guiding, nurturing, and caring for their children. Their influence is crucial from the outset, as they substantially shape their children's character and disposition. The way parents parent their children can significantly enhance their overall development, as their methods significantly influence their children's social and emotional maturity. To foster healthy maturation and ensure their children's social integration, parents need to thoroughly understand the intricacies of their children's social and emotional development. Parents are the first teachers responsible for teaching, nurturing, and raising their children. Parental involvement is crucial. This study aims to examine the significance of parenting strategies employed by mothers and fathers and the extent to which these strategies shape their children's social and emotional development. The results of this study identified three distinct categories of parenting tactics commonly employed by mothers and fathers in raising their children: indulgent, dictatorial, and collaborative. Each of these parenting approaches exerts a unique influence on children's social and emotional maturation. The main difference lies in the observation that dictatorial and indulgent parenting approaches typically produce less beneficial results than collaborative parenting approaches, which typically produce more beneficial results. Therefore, it is recommended that mothers and fathers adopt a collaborative parenting approach when raising their children.

This research is motivated by the low level of discipline among elementary school students, characterized by non-compliance with rules, tardiness, and other negative behaviors, thus requiring the role of Pancasila and Citizenship Education (PPKn) as a strategic solution. This research aims to examine the role of PPKn learning in shaping the discipline of elementary school students through a library research approach. This research method uses a systematic and comprehensive library research method to assess the contribution of PPKn learning in forming the discipline of elementary school students (SD). The main focus is on national scientific sources in Indonesian and English languages from the period 2020-2025, with the aim of identifying patterns and strategies of PPKn learning towards improving student discipline in SD. The study results show that PPKn learning is effective in internalizing discipline values through habituation, teacher exemplification, continuous evaluation, and the use of innovative learning media such as educational videos. The involvement of teachers, schools, and parents is an important factor in supporting the formation of student discipline character, with strategies such as family collaboration and group supervision to overcome external challenges. This research provides a theoretical contribution as a basis for developing applicable PPKn learning strategies to form a disciplined generation in elementary schools. The implications of this study indicate that PPKn learning has a strategic role in shaping the discipline of elementary school students, thus requiring synergy between teachers, schools, and parents to optimize the internalization of character values in every learning activity.

The increasing integration of digital technology into the daily lives of Generation Alpha has contributed to reduced physical activity, highlighting the need to understand the factors shaping children’s movement behaviors. This study employed a quantitative correlational approach to examine the relationship between parental educational background and the physical activity levels of students aged 13–15 at SMP 1 Waru Sidoarjo. Data were collected through a parental education questionnaire and the PAQ-C instrument, which assesses children’s physical activity over the past seven days. A total of 45 respondents participated, and the data were analyzed using Pearson or Spearman correlation tests, depending on distribution. The findings revealed a positive and statistically significant—though weak—association between parental education and children’s physical activity levels. Parents with higher education tend to promote more active lifestyles by regulating screen time, providing access to sports facilities, and modeling healthy behaviors. These results underscore the essential role of families in developing healthy routines among Generation Alpha and the need for educational initiatives to enhance parental awareness of physical activity in an increasingly digital environment.

The rapid development of digital technology has increased the intensity of social media use among adolescents, particularly Instagram, leading to a decline in social interaction, low emotional regulation, and an increased tendency toward addictive behavior. Within the context of guidance and counseling, art possesses therapeutic potential, enabling students to express themselves and manage digital behaviors more adaptively. This study is a literature review analyzing seven selected scientific articles regarding the utilization of art in group counseling services. The analysis was conducted through data extraction of article characteristics, including research design, instruments, findings, and implications. The results indicate that art plays a significant role in supporting group dynamics, enhancing emotional regulation, and providing alternative activities capable of diverting students' attention from excessive Instagram use. Structured art activities also facilitate the development of self-awareness and self-control, thereby reducing the frequency of Instagram usage. These findings suggest that art-assisted group counseling is an effective and relevant strategy for guidance and counseling teachers to implement in addressing digital challenges within the school environment.

The evaluation of Indonesian language instruction at the junior secondary level remains predominantly oriented toward lower-order thinking skills, thereby constraining the advancement of students’Higher Order Thinking Skills (HOTS). This situation necessitates the development of comprehensive assessment tools that are coherently aligned with the Merdeka Curriculum. The present study introduces a model for constructing HOTS-oriented assessment instruments targeting procedural text writing in Phase D. The development process was systematically organized through several stages: translating learning outcomes into measurable indicators, preparing assessment blueprints, creating item cards, formulating scoring rubrics for attitudes, knowledge, and skills, and finally analyzing and interpreting the assessment data. These instruments were specifically designed to capture students’ analytical, evaluative, and creative abilities in producing procedural texts that are logical, coherent, and effective. Findings demonstrate that the instruments provide an objective and holistic representation of students’ competency attainment. In summary, the proposed HOTS-based assessment model for procedural text writing is practical, methodical, and contextually relevant, serving as a valuable framework for evaluating Indonesian language learning in accordance with the Merdeka Curriculum principles.

Children with emotional and behavioral difficulties are children who have trouble adjusting to their social environment. This can affect their academic and functional abilities in daily life. Children with emotional dysregulation and aggressive behavior are particularly vulnerable to experiencing a series of social problems due to their emotional and behavioral difficulties. Therefore, emotional and behavioral intervention is needed to help them develop new adaptive behaviors and reduce maladaptive behaviors. One intervention method that is often used to reduce children's abberant behavior is CBT, especially the CBT-AAC model, which focuses on three dimensions, namely anger management skills, problem-solving skills, and social skills. This study used the SSR (Single Subject Research) research model on a 15-year-old boy with behavioral problems (Conduct Disorder) with symptoms of aggressive dominance. The CBT program was implemented with a total of 5 meetings using various approaches that focused on the child's aggressive problems. The behavior frequency graph then showed a significant decrease in aggressive behavior and positive changes in the cognitive process.

Intensive exploitation of fish for caviar production currently threatens the extinction of sturgeon, one of the ancient fish species. Sturgeon egg harvesting is often carried out in inhumane ways, such as dissecting and killing parent fish, causing the natural sturgeon population to decline. The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) regulates the international trade of sturgeon and caviar, but weak law enforcement, high market demand, and widespread illegal trade all exacerbate the conservation status of this species. Conversely, caviar aquaculture, often considered an alternative, raises new bioethical issues, including long-term stress on fish, disease spread, decline in animal health, and the risk of hybridization that could threaten the genetic integrity of sturgeon populations. From a bioethical and environmental ethics perspective, it is difficult to justify the consumption of caviar as a luxury commodity at the expense of ecosystem sustainability and animal welfare. Therefore, sturgeon conservation requires a comprehensive approach that includes reducing consumer demand, improving legislation and enforcement, and preserving and restoring sturgeon's natural habitats.

The normal flora of chickens refers to the microbial communities that naturally inhabit the gastrointestinal tract and body surfaces of chickens, playing a crucial role in health, digestion, and immunity. This community consists of beneficial bacteria such as Lactobacillus, Bifidobacterium, and Bacillus, which assist in feed fermentation, vitamin synthesis, and inhibition of pathogenic growth. Additionally, the normal flora may include potential pathogenic bacteria such as Escherichia coli, Salmonella spp., and Campylobacter, which can cause diseases if microbial balance is disrupted. The diversity and balance of the microbiota are influenced by various abiotic factors, including feed quality, access to clean water, ambient temperature, humidity, and environmental hygiene. Biotic factors, such as microbial interactions, rearing systems, and contact with other animals, also play a significant role in determining microbial composition. Several studies have shown that the use of feed additives, such as probiotics and phytogenics, can enhance populations of beneficial bacteria while suppressing pathogenic bacteria. Extensive rearing systems, which provide chickens with more space and exposure to natural environments, tend to increase microbiota diversity compared to semi-intensive systems with more restricted conditions. Understanding these factors is essential for developing effective health management strategies and optimizing safe and sustainable poultry production.