Camshaft lift is an important parameter that determines the height of the valve lift, calculated from the valve position when it is completely closed to the fully open position. This component plays a crucial role in regulating the flow of the air and fuel mixture into the combustion chamber. This study aims to improve the performance of a 200cc 4-stroke motorcycle engine through camshaft lift modification, which is expected to affect the characteristics of engine torque and power. Modifications were carried out by designing two types of modified camshafts, namely series A and series B, as a comparison to the standard camshaft. The research method used is experimental testing using a dynamometer to measure engine torque and power at various speeds, ranging from 4,000 to 10,000 RPM. The data obtained were analyzed to determine the effect of each type of camshaft on engine performance. The test results show that the B series camshaft provides the most significant performance improvement compared to the standard and A series camshafts. At 7,500 RPM, the standard camshaft produces an average torque of 19.2 Nm, the A series camshaft 19.6 Nm, while the B series camshaft reaches 21.2 Nm. Meanwhile, at 10,000 RPM, the average power of the standard camshaft is recorded at 22.2 HP, the A series camshaft 24.1 HP, and the B series camshaft reaches 26.3 HP. This increase indicates that the camshaft lift modification is able to optimize the duration and height of the valve opening, so that the supply of the fuel and air mixture to the combustion chamber becomes more efficient. Thus, camshaft modification, especially the B series, is an effective and applicable solution in increasing the performance output of a 200cc motorcycle engine without having to make major changes to the overall engine structure.

Motor development in infants is a crucial process that occurs gradually and follows the principles of age-appropriate development. Each fundamental motor stage—such as tummy time, rolling over, sitting, crawling, standing, and walking—must be passed through sequentially to ensure optimal motor concept development. Skipping or insufficient stimulation of these stages may lead to difficulties in understanding functional body movements. One of the main causes of delayed motor development includes a lack of motor stimulation time, overly restrictive parental supervision, and low levels of motivation and stimulation provided to the child. Tummy time, or placing the baby in a prone position while awake, is a proven effective form of motor stimulation that supports the development of the baby’s neck, back, and arm muscles. This activity also assists infants in reaching subsequent developmental milestones such as rolling over and crawling. This Community Service Program (PkM) was conducted at the Physioroom Clinic and was attended by 15 mothers with infants aged 3 to 6 months. The objective of the program was to enhance mothers’ knowledge regarding the importance of tummy time in supporting infant motor development. The program's implementation included educational sessions, tummy time practice demonstrations, group discussions, and interactive Q&A sessions. To measure the increase in participant knowledge, a pre-test and post-test were administered before and after the activity.The results of this PkM activity showed an increase in the average knowledge score from 6.4 in the pre-test to 8.6 in the post-test. This improvement demonstrates the program’s effectiveness in educating mothers about the benefits of tummy time for infant motor development. It is hoped that the mothers will consistently apply this stimulation at home to optimally support their children's growth and development.

The purpose of this study is to see how the role of influencers and social media marketing has an impact on the interest of Universitas Pembangunan Panca Budi management students in buying Crocs sandals. This research falls into the associative quantitative category. This research involved 5,695 management students of Universitas Pembangunan Panca Budi Medan batch 2023 and 2024 who are familiar with Crocs sandals. This study used purposive sampling technique and Slovin's formula to select 99 respondents aged 18-25 years from the Management Study Program of Universitas Pembangunan Panca Budi. Primary data and secondary data were collected through literature studies and questionnaires with a Likert scale. Validity and reliability tests were conducted on all statement items; influencer role variables (X1), social media marketing (X2), and purchase intention variables (Y) were declared valid and reliable; multiple linear regression, partial test (T), simultaneous test (F), and coefficient of determination (R2). The classic assumption test of data is used in this study. Based on Multiple Linear Regression Analysis of influencer role variables (X1) and social media marketing (X2), there is a positive correlation to purchase intention (Y). Based on the partial test results (T test), the role of influencers (X1) has a positive and significant effect on purchase intention (Y), with a t value of 3.184 and a significance of 0.002 (smaller than 0.05). Social media marketing (X2) also has a positive and significant effect on purchase intention (Y), with a t value of 3.113 and a significance of 0.002 (smaller than 0.05). Based on the results of the simultaneous test (F test), the influencer role variable (X1) and social media marketing (X2) together have a significant influence on purchase intention (Y), with a calculated f value of 5.717 and a significance of 0.005 (smaller than 0.05). 62.0% of the variation in purchase intention (Y) is caused by the influencer role variable (X1) and social media marketing (X2). Other factors not discussed in this study affect 38.0% of the variation in purchase intention (Y).

This study aims to describe elementary school teachers’ perceptions of the use of STEM-based instructional media as an effort to strengthen 21st-century skills. The research employed a descriptive qualitative approach with the subjects being elementary school teachers in the regions of Tasikmalaya City and Regency. The population included all elementary school teachers in both areas, with a purposive sample of 50 participants. The research instrument was a Likert-scale questionnaire developed based on three indicators of STEM literacy: (1) awareness of the role of STEM in modern society, (2) familiarity with basic STEM concepts, and (3) foundational fluency in STEM application. Data were collected using an online questionnaire via google forms, while the data analysis involved calculating the average score for each indicator. The results showed that for the first indicator, teachers in Tasikmalaya City had higher awareness (average score of 4.05) compared to those in the Regency (3.93). However, in the second and third indicators, teachers from the Regency scored higher, at 3.39 and 3.67 respectively, compared to city teachers who scored 3.30 and 3.59. These findings suggest that although urban teachers have stronger conceptual awareness, rural teachers demonstrate greater mastery in understanding and applying STEM practically in classroom learning. This difference is suspected to be influenced by contextual experience and more frequent implementation of hands-on learning approaches in the Regency.

Musyarakah Mutanaqisah (MMQ) is a form of sharia-based financing that offers a home ownership solution free from elements of interest (riba). This article aims to analyze the application of the MMQ contract in housing finance, compare it with the conventional mortgage scheme (Kredit Pemilikan Rumah/KPR), and evaluate its impact on community welfare. This study employs a descriptive qualitative approach through literature review of academic sources, regulations, and other relevant data. The analysis shows that MMQ is superior in terms of compliance with Islamic principles, fairness in risk sharing, and flexibility in payment structure. Furthermore, the MMQ scheme contributes to the improvement of social and economic well-being, particularly for the lower-middleincome segment of society. Nevertheless, its implementation still faces challenges such as the risk of default and the need for strengthened risk management systems. Therefore, collaboration between Islamic financial j, the government, and the public is essential to optimize the potential of MMQ as a fair and sustainable alternative for home financing

This study aims to systematically review the literature related to teamwork in the context of formal organizations, with a focus on concept mapping, identification of key factors, and remaining research gaps. The method used is Systematic Literature Review (SLR) by analyzing 797 articles published in 2021-2025. The selection process was rigorous using inclusion and exclusion criteria, followed by thematic coding to identify key patterns. The analysis showed that effective communication, participative leadership, and psychological safety are the main factors that shape solid teamwork and positively impact employee performance and job satisfaction. However, there were a number of organizational contexts where teamwork did not contribute significantly, indicating the need for attention to contextual factors, organizational culture and psychosocial dynamics. This study makes theoretical and practical contributions to designing evidence-based organizational interventions to sustainably improve teamwork effectiveness.

This study investigates the impact of interest rate effectiveness, inflation, and exchange rates on economic growth in Indonesia between 2014 and 2023. Using a simultaneous equation model and the Two-Stage Least Squares (TSLS) estimation technique, the research analyzes the interrelationships among key macroeconomic indicators. The results show that exports and investment significantly influence GDP, whereas the exchange rate and money supply have no notable effect. Furthermore, GDP growth is identified as a significant determinant of investment, while interest rates and inflation are found to be statistically insignificant. The diagnostic tests confirm that the regression model satisfies the classical assumptions of normality and absence of autocorrelation. These findings highlight the importance of promoting exports and enhancing investment to support Indonesia’s sustainable economic development. Policymakers are encouraged to focus on trade performance and investment climate, as these factors have a stronger direct impact on growth compared to inflation and interest rates during the observed period.

This study aims to analyze the effectiveness of the Indonesian Advertising Ethics (EPI) in regulating advertisements in the digital era, based on the gap between regulations and practice in the field. The research utilizes a qualitative approach, employing documentary studies and in-depth interviews to gain a comprehensive understanding of the issue. The results show that the EPI's effectiveness in maintaining fairness, honesty, and responsibility in digital advertising is still weak. This weakness is not due to the substance of the EPI itself, but mainly because of the rapid development of technology, the vast expansion of digital media, low compliance from practitioners, and the self-regulatory approach that relies on the awareness and responsibility of each actor. The study also finds a gap between regulation and practice due to the EPI’s continued use of a framework designed for traditional media, making it less adaptable to digital media's unique challenges. Therefore, the research concludes that a more adaptive, collaborative, and multi-stakeholder approach is required to safeguard advertising ethics and protect the public's interest in the digital era

This seminar was held to introduce and unify ideas about Operating Systems and Artificial Intelligence (AI) among students of SMP Ibrahimy 3 Sukorejo. The main objective of this seminar is to instill a basic understanding in students about how AI and Operating Systems can work together to improve the quality of teaching and learning activities. This seminar is packaged with an interactive method and equipped with easy-to-practice explanations so that students can more easily understand and apply AI wisely. The results of this event show an increase in students' interest and practical insight into AI technology and awareness of its responsible application. By holding this seminar, it is hoped that students will have the initial capital to face the rapid progress of technology and be able to use it productively and ethically

This study aims to identify the challenges faced by teachers in designing Program Pembelajaran Individual (PPI) for children with special needs in Pekanbaru City. PPI is a learning approach that is specifically designed to suit the unique needs, potential and characteristics of each learner, especially in the context of inclusive education which prioritizes equal access for all children. This research uses a descriptive qualitative method with data collection techniques through in-depth interviews and direct observation of teachers in several special schools (SLB). The results showed that teachers face various challenges, such as the number of children with disabilities exceeding the ideal class capacity, the diversity of student characteristics, limited human resources and infrastructure, lack of active parental involvement, and the gap between pedagogic theory and practice in the field. Despite this, teachers continue to do their best by developing creative, flexible and collaborative learning strategies. This study recommends the need for more concrete support from schools, government and families for the successful implementation of IEP in inclusive education.