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.

Community participation refers to the active involvement of citizens in various stages of the development process, especially at the village level. A concrete example of community participation can be seen in the case study of Bendhung Lepen, located in Mrican Village, Yogyakarta. Bendhung Lepen is an irrigation canal that stems from the Gajah Wong River. Before its revitalization, the area faced numerous environmental problems, primarily due to household waste and pollution that contaminated the waterway and negatively affected the environment and public health. In response to these issues, local residents, along with relevant stakeholders, initiated an environmental conservation program. The main goal of this initiative was to restore the ecological function of Bendhung Lepen and transform it into a clean, green, and beneficial public space for the community. This study aims to measure the level of community participation in the environmental conservation program. Data collection methods included questionnaires for quantitative analysis and in-depth interviews for qualitative insights into community involvement. The results of the study show that community members were actively involved in various phases of the program, including planning, implementation, and evaluation. Stakeholders involved in the program included community leaders, youth groups, environmental organizations, and village officials. The forms of participation extended beyond voicing aspirations to contributing labor (through mutual cooperation) and materials (such as donations or supplies). According to Arnstein’s ladder of participation, the level of community participation in this conservation program falls under the category of "delegated power," which represents a high degree of participation. This means that the community was not merely involved as passive participants but was given real authority in decision-making and program management. These findings indicate that genuine and sustained community involvement plays a crucial role in the success of local environmental conservation efforts.

This study presents an evaluation of the cooling load capacity in the departure apron corridor area at Supadio International Airport using the Cooling Load Temperature Difference (CLTD) method. The objective of the research is to assess whether the current air conditioning (AC) is adequate to meet thermal comfort requirements in a tropical climate characterized by high humidity and strong solar radiation. A detailed field survey was conducted at Gate 3, a glass-dominated corridor that experiences significant heat gain from solar exposure. Empirical data including temperature profiles, material properties, occupancy levels, and equipment specifications were collected over a two-week period using digital instruments. Using the CLTD method, the heat contributions from walls, roof, glass surfaces, occupants, lighting, and air infiltration were quantified. The results revealed that the installed AC (2 PK) only delivers about  of the required cooling load, with the total load estimated at 66,448 BTU/hr. The dominant sources of thermal gain include the roof and east-facing glass panels. The study recommends AC resizing, glass shading implementation, and improved insulation to enhance energy efficiency. This research contributes practical insights for HVAC optimization in airport infrastructure within hot-humid climates.

This study aims to analyze the influence of regional financial management, technology utilization, and regional financial accounting systems on the quality of regional government financial reports. The method used in this study is quantitative. Data were obtained by distributing questionnaires to respondents who had been determined using purposive sampling techniques. Data analysis techniques used in this study include descriptive statistics, validity tests, reliability tests, classical assumption tests, and multiple linear regression analysis. The results showed that regional financial management had a significant effect on the quality of regional government financial reports with a t count of 6.333> t table 1.668 and a significance of 0.000 <0.05. The use of technology had a significant effect on the quality of regional government financial reports with a t count of 5.837> t table 1.668 and a significance of 0.000 <0.05. The Regional Financial Accounting System had a significant effect on the quality of regional government financial reports with a t count of 4.102> t table 1.668 and a significance of 0.000 <0.05.

This research aims to find out the procedure for land certification as a result of the land swap (ruislag) in the implementation of the ruislag between MAN 2 Kuningan and Ciawigebang Village, a more in-depth analysis of the issues and strategies made by the parties involved in the certification process to achieve legal certainty of land rights. This research employs a qualitative research method, drawing on an empirical legal research approach and a sociological perspective. The results of this study indicate that the process of land certification as a result of ruislag is included in the maintenance service of land registration data by the Regulation of the Head of the National Land Agency of the Republic of Indonesia Number 1 of 2010 concerning service standards and land regulations so that a certificate of use rights and a certificate of business use rights for four plots of land to replace the Ciawigebang MAN 2 Kuningan Village Treasury. The issues faced are related to administrative documents, designation of replacement land rights, and land conditions, because the distance between the ruislag process and land registration is quite long. Strategies made are cooperation between the parties, increasing the intensity of coordination between agencies, and reviewing regulations relating to the issuance of ruislag and registration of land rights. With these strategies, the certification process has become easier, thereby ensuring the legal certainty of land rights for rights holders.

This study aims to describe the application of the Project Based Learning (PJBL) learning model in improving the understanding of the concept of changes in the state of matter in Elementary School students. The background of this study is based on the low understanding of students on the material of changes in the state of matter, which can have an impact on the weak mastery of scientific concepts as a whole. The method used is qualitative research with a library research approach, where data is collected through analysis of various scientific literature, journals, and relevant academic sources. The results of the study indicate that PJBL is a learning model that emphasizes the active involvement of students in real projects, from designing, implementing, to presenting the results. The application of PJBL in the topic of changes in the state of matter encourages students to experience scientific processes such as melting, evaporating, freezing, and condensing directly through simple experiments. PJBL not only improves students' conceptual understanding, but also develops science process skills, critical thinking, collaboration, communication, and responsibility. In its implementation, PJBL follows certain stages starting from determining essential questions to reflection. Despite facing several challenges such as limited time, facilities, and teacher readiness, solutions can be sought through effective planning and professional training. Thus, PJBL has proven to be the right approach in improving the quality of science learning in elementary schools, especially in strengthening students' understanding of the concept of changes in the state of objects in a comprehensive and meaningful manner.

Apotek Adli mengalami tantangan dalam pengelolaan stok produk akibat sistem pencatatan penjualan yang masih dilakukan secara manual. Hal ini menyulitkan dalam analisis pola penjualan dan dapat menyebabkan kekurangan atau kelebihan stok. Penelitian ini bertujuan untuk mengembangkan sistem klasifikasi penjualan berbasis web menggunakan algoritma K-Nearest Neighbor (KNN) untuk membantu pengelolaan stok di Apotek Adli. Sistem ini mengelompokkan produk ke dalam tiga kategori sangat laris, sedang, dan rendah berdasarkan data penjualan selama enam bulan terakhir. Metodologi pengembangan yang digunakan adalah metode waterfall dengan tahapan mulai dari analisis kebutuhan hingga implementasi. Sistem dibangun menggunakan teknologi Laravel, PHP, dan MySQL, serta diuji melalui pendekatan white box dan black box. Hasil implementasi menunjukkan bahwa sistem mampu mengklasifikasikan produk dengan baik, memudahkan pengelola dalam merencanakan stok, serta meningkatkan efisiensi pengelolaan apotek secara keseluruhan. Sistem ini juga mendukung pemantauan penjualan dan klasifikasi produk secara real-time melalui antarmuka yang intuitif dan mudah digunakan

This study aims to enhance students' engagement and mathematics achievement through the implementation of differentiated learning. The method employed is classroom action research conducted in two cycles, each consisting of planning, action implementation, observation, evaluation, and reflection stages. The research was carried out during the odd semester at SMK Muhammadiyah 1 Sleman with the participation of 28 students from the XI Automotive class. The findings reveal a significant improvement in students' engagement and learning outcomes. In the first cycle, the average engagement score was 9.51, which increased to 17.12 in the second cycle. Regarding learning outcomes, in the first cycle, only 10 students (35,71%) achieved the passing grade, while 18 students (64.29%) did not, with an average score of 64.75. In the second cycle, the number of students achieving the passing grade sharply increased to 28 students (100%) with an average score of 84.92. These results demonstrate that differentiated learning effectively enhances student engagement and mathematics achievement in the XI Automotive class at SMK Muhammadiyah 1 Sleman during the 2024/2025 academic year

This study aims to determine the impact of labor costs, marketing costs, and sales volume on the net profit of manufacturing companies in the food and beverage sub-sector listed on the Indonesia Stock Exchange (IDX) for the years 2020-2024. This research utilizes a descriptive research type with a quantitative approach. The population of this study includes manufacturing companies in the food and beverage sub-sector that are listed on the IDX for the years 2020-2024, totaling 48 companies. The sampling technique employed is purposive sampling, involving 20 companies. The data source for this research utilizes secondary data. Data collection methods are obtained from the Indonesian Stock Exchange (IDX). This study employs data analysis methods, which include descriptive statistical tests, classical assumption tests, and hypothesis testing, comprising multiple linear regression analysis, F test, t test, and the coefficient of determination (R2) test.The results of this study indicate that labor costs do not have a significant effect, while marketing costs and sales volume do have a significant effect.

This research aims to determine the effect of production costs, operational costs, and sales volume on the net profit of manufacturing companies in the miscellaneous industry sector listed on the Indonesia Stock Exchange from 2021-2024. The objects studied in this research are manufacturing companies in the miscellaneous industry sector listed on the IDX from 2021-2024, totaling 48 companies. This type of research is quantitative. The research sample was selected using purposive sampling techniques, resulting in a sample of 16 companies. This research uses secondary data obtained from the Indonesian Stock Exchange (IDX). The data analysis techniques used include descriptive statistical tests, classical assumption tests, and hypothesis testing, which consist of multiple linear regression analysis, model feasibility test (F test), partial significance test (t test), and the coefficient of determination test. The results of this study indicate that production costs and operational costs have a significant negative effect on net profit, while sales volume has a significant positive effect on net profit.