Universitas Muhammadiyah Metro: E-Journals
Not a member yet
881 research outputs found
Sort by
Pengujian Metalografi Dan Kekerasan Dalam Penentuan Umur Sisa Screen Tube Superheater Pada Boiler Batu Bara
Full text linkSuperheater is one of the main parts of the boiler. One of the problems that often occurs in the superheater screen tube is that the screen bends due to exposure to high temperatures which causes the screen tube to deform. The aging phenomenon (decarburization) will occur over time the tube is operated, affecting the mechanical properties of the tube material, especially its hardness. The research objectives achieved are to determine the actual conditions, feasibility and remaining life of the superheater screen tube experiencing bending. Based on these conditions, it is necessary to conduct testing on the superheater screen tube that has been operating for approximately 11 years (96360 hours) until now. The method used is to conduct direct, macro and micro examinations on the condition of the screen tube that is bending. In situ metallographic testing on each superheater screen tube is carried out to determine the degradation of the high temperature effect during operation. In addition to in situ testing, metallographic testing in the laboratory is used to analyze the microstructure of the tube material during operation. Hardness testing, the chemical composition of the tube material is also carried out as a support in the process of calculating the remaining life using the Larson Miller Parameter (LMP) approach. From the test, the results showed that the condition of the screen tube that was bending was still suitable for use in accordance with the applicable SOP. In terms of microstructure, the superheater screen tube has experienced aging (decarburization) with a decrease in hardness value when compared to the hardness of the normal tube (166 HV). If operated properly, the superheater screen tube that is bending can be operated for up to 2 years and 8 months if the Turn Around (TA) program is not carried out until a replacement tube is available for 2 years and 10 months, still below the temperature (6200 C) or below the design temperature
MONITORING PADA UNIT GRADER 825A-2 DENGAN ALAT DATA LOGGER BERBASIS INTERNET OF THINGS PT KALIMANTAN PRIMA PERSADA JOBSITE INDE
Full text linkThe GD825A-2 Grader Unit at PT Kalimantan Prima Persada Jobsite Indehas an average Physical Availability (PA) value of 89%, below the target of 92%, due to the high unscheduled breakdown. Manual monitoring of sensor parameters is one of the causes of delays in damage detection. This study designs and implements an Internet of Things (IoT)-based monitoring tool with a data logger to read sensor data in real-time. The methods used include testing sensor accuracy against manual measuring instruments, descriptive statistical analysis, errors, and process capability tests. The results show a temperature sensor error rate of 2%, oil pressure 5%, and engine rotation 0.11%. All sensors are also proven to be stable, within statistical control limits, and have decent process capabilities. This system allows for accurate, fast, and remote monitoring of unit conditions, thereby reducing the risk of breakdown, and optimizing maintenance costs for the GD825A-2 unit
PERAN MEDIASI STRES AKADEMIK DALAM PENGARUH ANTARA EFIKASI DIRI AKADEMIK TERHADAP PROKRASTINASI AKADEMIK PADA MAHASISWA TINGKAT AKHIR
Full text linkAcademic procrastination is a common behaviour among university students, especially those in their final year. One psychological factor believed to influence this tendency is self-efficacy—the belief in one’s ability to complete academic tasks. At the same time, educational stress may act as a psychological mechanism that bridges the relationship between self-efficacy and procrastination. This study aims to examine whether academic stress mediates the relationship between self-efficacy and academic procrastination. A total of 218 final-year university students in the Greater Jakarta area (JABODETABEK) participated in this study through accidental sampling. Data were collected using adapted versions of three standardized psychological instruments: the College Academic Self-Efficacy Scale (CASES) to measure self-efficacy, the Educational Stress Scale for Adolescents (ESSA) to assess educational stress, and the Tuckman Procrastination Scale (TPS) to evaluate academic procrastination. Data were analysed using path analysis to test the proposed mediation model. The results revealed that self-efficacy had a significant negative effect on academic stress (a = -0.167, p < 0.001) and academic procrastination (c = -0.152, p < 0.001). Furthermore, academic stress had a significant positive effect on academic procrastination (b = 0.91, p < 0.001). When academic stress was included as a mediating variable, the direct effect of self-efficacy on procrastination remained significant but was reduced (c’ = -0.229, p < 0.001), indicating a partial mediation. These findings suggest that academic stress serves as a mediator in the relationship between self-efficacy and academic procrastination. In other words, self-efficacy influences the tendency to procrastinate indirectly through its impact on academic stress. This highlights the importance of not only enhancing students’ academic self-efficacy but also implementing strategies to reduce academic stress in order to effectively minimize academic procrastination among final-year university students.Academic procrastination is a common behaviour among university students, especially those in their final year. One psychological factor believed to influence this tendency is self-efficacy—the belief in one’s ability to complete academic tasks. At the same time, educational stress may act as a psychological mechanism that bridges the relationship between self-efficacy and procrastination. This study aims to examine whether academic stress mediates the relationship between self-efficacy and academic procrastination. A total of 218 final-year university students in the Greater Jakarta area (JABODETABEK) participated in this study through accidental sampling. Data were collected using adapted versions of three standardized psychological instruments: the College Academic Self-Efficacy Scale (CASES) to measure self-efficacy, the Educational Stress Scale for Adolescents (ESSA) to assess educational stress, and the Tuckman Procrastination Scale (TPS) to evaluate academic procrastination. Data were analysed using path analysis to test the proposed mediation model. The results revealed that self-efficacy had a significant negative effect on academic stress (a = -0.167, p < 0.001) and academic procrastination (c = -0.152, p < 0.001). Furthermore, academic stress had a significant positive effect on academic procrastination (b = 0.91, p < 0.001). When academic stress was included as a mediating variable, the direct effect of self-efficacy on procrastination remained significant but was reduced (c’ = -0.229, p < 0.001), indicating a partial mediation. These findings suggest that academic stress serves as a mediator in the relationship between self-efficacy and academic procrastination. In other words, self-efficacy influences the tendency to procrastinate indirectly through its impact on academic stress. This highlights the importance of not only enhancing students’ academic self-efficacy but also implementing strategies to reduce academic stress in order to effectively minimize academic procrastination among final-year university students
Permainan Tradisional Bakiak dan Hula Hoop Sebagai Saran Mengurangi Kecanduan Gadget Pada Anak-Anak TPQ Aisyiyah Blok M Kalirejo Lampung Tengah
Full text linkDunia anak-anak sangat erat kaitannya dengan bermain.Anak-anak bermain sampai lupa waktu untuk memenuhi kesenangan dan kegemarannya terhadap sebuah permainan tanpa melihat hasil akhir dari permainan tersebut. .Bermain memberikan keleluasaan berekspresi kepada anak-anak, sehingga menghadirkan kegiatan untuk bersenang-senang dan menambah teman baru. Kegiatan pengabdian ini bertujuan untuk mengurangi ketergantungan terhadap gadget dengan memperkenalkan kembali permainan tradisional, yaitu bakiak dan hula hoop, sebagai media pembelajaran aktif. Kegiatan dilaksanakan pada 20 Juni 2025 pukul 15.00 WIB dan melibatkan 26 anak dari jenjang TK hingga SD kelas 6. Hasil kegiatan menunjukkan anak-anak sangat antusias mengikuti permainan dan menunjukkan ketertarikan tinggi terhadap aktivitas fisik kelompok. Permainan tradisional ini juga berhasil memperkuat interaksi sosial antar anak, serta meningkatkan keterampilan motorik kasar dan kemampuan pemecahan masalah. Dengan demikian, pendekatan berbasis permainan tradisional terbukti efektif sebagai alternatif untuk mengalihkan perhatian anak dari gadget sekaligus mendukung perkembangan yang lebih seimbang
Pengaruh Variasi Temperatur Torefaksi Terhadap Karakteristik Wood Pellet dari Limbah Furnitur Kayu Campuran
Full text linkPenelitian ini bertujuan untuk mengevaluasi pengaruh proses torefaksi pada wood pellet berbahan limbah furniture campuran terhadap nilai kalor dan sifat kimia sampel. Sampel wood pellet terdiri dari 80% kayu keras (Meranti, Merbau, Ulin, Mahoni, Keruing) dan 20% kayu lunak (Sengon, Pinus), diproses melalui torefaksi pada temperatur 250°C, 275°C, dan 300°C selama 30 menit. Pengujian nilai kalor dilakukan untuk menentukan peningkatan energi, dan analisis proximate serta ultimate dilakukan untuk mengetahui perubahan sifat kimia. Hasil menunjukkan bahwa nilai kalor meningkat secara signifikan setelah proses torefaksi, dengan peningkatan tertinggi pada temperatur 300°C mencapai 5.161 kkal/kg atau naik sekitar 32,3% dibandingkan nilai kalor awal 3.902 kkal/kg. Uji proximate menunjukkan peningkatan kandungan karbon tetap dan abu, serta penurunan kadar air dan zat volatil. Uji ultimate menunjukkan peningkatan kadar karbon hingga 60,19% dan penurunan kadar oksigen hingga 26,61% pada temperatur 300°C. Selain itu, torefaksi meningkatkan sifat hidrofobik wood pellet, terbukti dari ketahanan terhadap perendaman air yang lebih tinggi. Berdasarkan hasil ini, dapat disimpulkan bahwa torefaksi pada temperatur tinggi (300°C) secara efektif meningkatkan kualitas energi dan kestabilan wood pellet, menjadikannya alternatif bahan bakar biomassa yang lebih efisien dan tahan terhadap kelembapan.Â
ANALISIS KOMPARATIF PROSES PIROLISIS DARI BAHAN SAMPAH PLASTIK DAN BIOMASSA TERHADAP HASIL PRODUK
Full text linkPyrolysis is a process of heating materials at high temperatures with little or no oxygen to chemically break down materials, to produce products such as fuel and liquid smoke. The purpose of this study was to determine the process, quantity, and characteristics of the products obtained from plastik waste and biomass. This research method uses a barner fueled by LPG gas. Using raw materials of LDPE plastik waste and biomass (rice husk) with a weight of 1.5 kg each. Using a batch type pyrolysis reactor and a straight pipe condenser with a diameter of 1 inch and a length of 4 m. The results showed that the two raw materials produced significantly different product proportions. LDPE pyrolysis produced a liquid product with a volume of 419 (mL) and a solid of 0.825 (kg), and had a higher calorific value of 10648.21 (kJ/kg) than rice husk. Meanwhile, rice husk pyrolysis produced a larger liquid (742 mL) with 0.316 kg of lower solids and a lower calorific value (8761.33 kJ/kg). This difference confirms that the type of feedstock significantly determines the quality and quantity of bio-oil or pyrolysis oil produced, which is crucial for renewable energy development and waste management
Interactive History Learning: Development of Canva-Based Materials at State Senior High School 7 Pontianak
Full text linkThis study aims to improve student academic achievement through the development of Canva-based teaching materials in class X-A of SMA Negeri 7 Pontianak in the 2024/2025 academic year. Through a classroom action research approach that combines observation, interviews, questionnaires, and tests, a significant picture of development was obtained in each learning cycle. The evaluation results showed an increase in scores from Cycle II by 48.57%, increasing in Cycle III to 66.28%, and finally reaching 84.41% in Cycle IV, thus exceeding the minimum completion limit of 75. In addition to improving student achievement, this activity also encouraged teachers to improve their ability to design and utilize digital learning resources that are more creative and relevant to student needs. Student responses also showed a positive tendency, especially regarding ease of access and the visual appearance of the teaching materials, which were considered more interesting and helped understand the material. Overall, these findings confirm that the use of Canva-based interactive teaching media can make a real contribution to improving the quality of the learning process and student learning outcomes
The Potential of Banyubiru Natural Sites as Local History Content in History Learning
Full text linkThe Banyubiru Natural Site is a tourist spot that has the potential to be used as a sources of historical learning. As a tourist spot, this place holds historical relics which are very important to be integrated into history learning in schools. The reasearcher considers that writing this research is important with the aim of knowing the potential of the Banyubiru Natural Site as local historical content in history learning. This research uses historical methods with four stages of vastu heuristics, verification, interpretation and historiography. The results of the research show that local history plays an important role so that students can to properly appreciate the development of their society in the past up to the present that occurred in their own environment. The Banyubiru Natural Site as local historical content is really needed to be integrated in learning because the site is in accordance with the scope of material in history learning which has been determined in the independent curriculum, namely in phase E class X which is related to material on “The Entry of Hindu-Buddhist Religion and Culture in Indonesiaâ€
SINERGI MASYARAKAT DALAM PENGEMBANGAN USAHA PRODUKSI DAN PENJUALAN KUE KELOMPOK WANITA TANI DESA SUMBER AGUNG
Full text linkThe Kelompok Wanita Tani (KWT) in Sumber Agung Village, Batanghari Subdistrict, East Lampung, has been mentored by Universitas Muhammadiyah Metro through the Pramuka Student Activity Unit since 2021. KWT manages five ventures, including cake production, grape seedling cultivation, and internet reselling. However, between 2022 and 2024, KWT faced various challenges, such as unstable internet access and the failure of the grape crops. Despite this, cake production continued, and the grape fields were converted into vegetable gardens. Through the Wiradesa Kemendikbud program, sustainable mentorship was provided to improve KWT's capacity, including entrepreneurship training, digital marketing, and the use of modern tools. The program successfully supported 14 households and expanded its reach to Banjarrejo and Tejosari. KWT also serves as a cake supplier at Tejo Agung market and provides training to 50 mobile vegetable vendors. Government and university support have contributed to the development of this initiative. The solutions offered include equipment assistance, packaging training, and digital marketing strategies. This program has increased production capacity, sales, and community participation, although challenges remain in stabilizing income. The program's sustainability potential is high due to strong support from the government, the university, and local distributors.Â
Analisis Pengaruh Suhu Terhadap Kuat Lekat Powder Coating Baja Astm A36 Pada Alat Incinerator
Full text linkCat serbuk atau biasa disebut Powder  coating merupakan salah satu sistem pengecatan yang berkembang pesat pada saat ini, serta memotivasi perusahaan untuk terus meningkatkan kualitas dan harga yang memuaskan bagi masyarakat. Sistem Powder  coating tidak menggunakan bahan cair atau pengencer yang biasa dilakukan pada cat konvensional lainnya. Untuk mencapai daya rekat yang maksimal maka sebelum melakukan Powder  coating, bahan yang akan di cat dibersihkan dan diberikan beberapa media treatment tertentu.Tujuan dari penelitian yaitu Mengetahui hasil ketebalan cat pada Powder  Powder  coating baja ASTM A36 pada alat incinerator dan pengaruh variasi pada Powder  coating baja ASTM A36 pada alat incinerator. Metode penelitian yang dilakukan yaitu dengan membuat spesimen plat baja ukuran 10cm x 5cm dengan ketebalan 6mm. Pengujian dilakukan dengan mengecek ketebalan lapisan dan kuat lekat pada cat Powder  coating menggunakan alat uji thickness gauge dan pull-of test. variasi ketebalan cat 2 layer dan 4 layer. Dari hasil penelitian dapat disimpulkan bahwa meningkatnya suhu pengovenan dapat menyebabkan melelehnya cat sehingga ketebalan dan kelekatan cat kurang bai