bluuebunny/crossref_metadata_2025 huggingface dataset:
Educator Creativity in Transdisciplinary and Crossdisciplinary Approaches to Social Studies Learning at the Junior High School / MTS Level
Authors: Hasanah Nurul , Syaharuddin Syaharuddin , Triyono Sigit , Ilhami M. Ridha , Syarifuddin Syarifuddin , Jumriani Jumriani
Published: December 2024

A developed country can be said to prioritize education, arguing that without education a nation will not have the ability to manage to meet the needs of life. The role of an educator has a very important task, role, and position in the world of education. That is why, an educator must always develop his abilities. The method used in writing this article is a descriptive analysis technique with literature study. Collect articles, e-books, journals and other scientific literature obtained from the Google Scholar platform or also called Google Scholar and online e-book books. The creativity of an educator in using learning methods to increase student motivation in junior high school social studies / MTS lessons always tries to increase creativity. In a transdisciplinary or crossdisciplinary view, education must involve the development of human potential and humanity of a student. A learner must develop his personal life which concerns various aspects of personality with regard to social life, culture, religion, art, economy, science and technology as a human being. Education must also develop the human potential of a student such as concern for the environment, society, nation, state, human beings who can make themselves as agents of change in the welfare of community life and use discipline and transdiscipline as tools for the welfare of human life. Teacher Creativity Development in creative learning based on a learning approach is to provide material that is in accordance with life events / experiences. By using a variety of relevant disciplines.
Analisis peledakan batu kapur untuk memprediksi ground vibration dan flying rock di PT Semen Baturaja Tbk
Authors: Tarigan Timotius , Jasipto Alio , Danasla M. Akbari , Arham La Ode , Jarwinda Jarwinda
Published: December 2024

Dampak peledakan seperti ground vibration dan flying rock dapat menimbulkan kerugian yang besar bagi lingkungan sekitar terutama masyarakat. Memprediksi dampak peledakan terhadap lingkungan sangat penting untuk dilakukan sebagai pertimbangan dalam perencanaan peledakan. Menggunakan rumus empirik adalah salah satu cara yang akurat dalam memprediksi ground vibration dan flying rock. Metode yang digunakan dalam penelitian ini adalah metode terapan menggunakan rumus empirik dari United state Bureau of Mines (USBM) untuk ground vibration dan Richard and Moore untuk flying rock. Tahapan penelitian ini meliputi studi literatur, pengambilan data, pengolahan data, analisis data, dan memberikan kesimpulan, saran serta rekomendasi. Hasil analisis prediksi PPV maksimal di Pit 1 PT Semen Baturaja Tbk berada diangka 0,94 mm/s dan hasil analisis prediksi flying rock maksimal diradius 142 m pada kondisi faceburst. Kedua hasil ini dinyatakan aman karena memenuhi kualifikasi standar nasional indonesia (SNI) 7571 tahun 2010 dan keputusan mentri ESDM nomor 1827 K/30/MEM/2018.
Pengaruh powder factor terhadap fragmentasi batuan hasil peledakan overburden di PT Amanah Anugerah Adi Mulia
Authors: Putera Wahyu Tri Wardani , Santoso Eko , Annisa Annisa
Published: December 2024

Powder Factor (PF) merupakan perbandingan antara jumlah bahan peledak yang digunakan terhadap volume batuan yang akan diledakkan. PF dapat dijadikan acuan dalam menilai keberhasilan dari suatu kegiatan peledakan karena PF berpengaruh terhadap fragmentasi batuan hasil peledakan. Studi kasus peledakan overburden dilakukan di PT Amanah Anugerah Adi Mulia. Analisis nilai persentase aktual fragmentasi batuan menggunakan bantuan software Split Desktop 2.0. Perusahaan mentargetkan nilai PF berada pada rentang 0,20 – 0,30 kg/m3 dan persentase fragmentasi batuan ukuran boulder ≥ 80 cm tidak lebih dari 15%. Hasil perhitungan menunjukkan nilai aktual PF berada pada rentang 0,22 – 0,29 kg/m3 dan persentase fragmentasi batuan ukuran boulder ≥ 80 cm berada pada rentang 2,85 – 13,54%. Hasil perbandingan antara target dan aktual menunjukkan PF dan persentase fragmentasi batuan telah memenuhi standar perusahaan. Berdasarkan peninjauan fragmentasi batuan aktual diperoleh nilai PF optimal adalah 0,22 kg/m3.
Analisis pemanfaatan fly ash dan bottom ash sebagai campuran material perkerasan jalan di PLTU Asam Asam
Authors: Amin Ading Fahriza , Nurhakim Nurhakim , Riswan Riswan
Published: December 2024

Besarnya jumlah limbah abu batubara akibat penggunaan batubara sebagai bahan bakar PLTU menimbulkan masalah terutama dalam proses pembuangannya karena membutuhkan tempat serta fasilitas pembuangan khusus. Dewasa ini diketahui penggunaan fly ash dan bottom ash dapat digunakan sebagai campuran material perkerasan jalan. Penelitian ini bertujuan untuk memanfaatkan limbah abu batubara sebagai campuran material perkerasan jalan di PLTU Asam-asam untuk mengurangi jumlah limbah abu batubara yang volumenya bertambah setiap harinya. Berdasarkan hasil analisis yang telah dilakukan, persentasi komposisi campuran material lapisan pondasi bawah adalah fly ash 70%, bottom ash 25% dan semen 5% sebagai lapisan pondasi bawah layer 1 dengan nilai CBR yang dihasilkan hampir dua kali lebih besar dari komposisi campuran material lapisan pondasi bawah 70% fly ash, 20% bottom ash dan 10% semen.
Analisis Kinerja Excavator JCB 305-LC dalam Pemindahan Overburden untuk Pembuatan Stockpile Crushing Plant PT BMR
Authors: Huda Nurul , Putri Karina Shella , Syafi'i Ahmad Ali
Published: December 2024

Penelitian ini dilakukan untuk mengkaji produktivitas excavator JCB 305 LC dalam pemindahan overburden pada proyek pembuatan stockpile Crushing Plan (CP 8) di PT Berkat Murah Rezeki, Desa Tatakan, Kecamatan Tapin Selatan, Kalimantan Selatan. Target produktivitas overburden yang diharapkan adalah 37.000 BCM per bulan. Hasil penelitian menunjukkan produktivitas rata-rata sebesar 56.90961 BCM per bulan. Data yang diperoleh meliputi waktu siklus (cycle time) rata-rata 2445 detik dan waktu tunda (delay time) sebesar 777 detik. Analisis ini digunakan untuk mengevaluasi efisiensi dan produktivitas excavator serta mengidentifikasi pengaruh waktu siklus dan waktu tunda terhadap kinerja alat. Hasil penelitian menunjukkan bahwa hubungan antara efisiensi kerja dan produktivitas alat erat kaitannya dengan waktu siklus dan waktu tunda, yang dapat digunakan untuk meningkatkan strategi operasional dalam pemindahan overburden.
Development of Student Worksheets on Dynamic Fluids Material to Enhance Scientific Creativity
Authors: Lusia Monica Maya , Suyidno Suyidno , Miriam Sarah , Dewantara Dewi
Published: December 2024

Scientific creativity involves creating innovative ideas, thoughts, or concepts. Scientific creativity in schools is not sufficiently trained. This study aims to produce valid, practical, and effective dynamic fluids student worksheets that are suitable for enhancing students' scientific creativity. This study applied the ADDIE model with 34 test subjects from the XI MIPA 3 class at SMA Negeri 8 Banjarmasin. Data were obtained from validation sheets, student response questionnaires, and learning outcome tests. The results showed that: (1) The student worksheets is considered valid because the validation results of the student worksheets and learning outcome tests were categorized as very good; (2) The student worksheets is considered practical because the results of the student response questionnaires were categorized as good; (3) The student worksheets is considered effective because the N-Gain of scientific creativity was 0.70, which falls into the high category. The developed dynamic fluids student worksheets is appropriate for enhancing students' scientific creativity in physics learning. Teachers can use this the student worksheets as an alternative to improve students' scientific creativity in physics education efforts.
Practicality and Effectiveness of Activity-based Worksheets with the ExPRession Learning Model to Train Hands-on Activities on Newton's Law
Authors: Anisa Tria , Herlina Kartini , Viyanti Viyanti
Published: December 2024

This research aims to determine the practicality and effectiveness of worksheets based on the ExPRession learning model to train direct practical activities on Newton's laws. The samples are classes of X Science 4 and X Science 5 at SMAN 1 Gadingrejo in the 2022/2023 academic year. The research design uses the Pretest-Posttest Control Group Design. Applying worksheets with the ExPRession learning model in physics learning effectively trains students' activity skills. This is proven by the results of learning implementation using the ExPRession learning model, reaching 87.30%, and the assessment of students' Hands-on Activity, reaching 78.35%. The results of hypothesis testing also show a higher difference in students' practical activity skills between classes that apply worksheets based on the ExPRession learning model in physics learning. Based on the research results, it was found that implementing activity-based worksheets with the ExPRession learning model impacted training students' hands-on activity skills. This is because learning using various forms of representation can help students' understanding of concepts when solving physics problems. Students are more enthusiastic if the physics learning process is accompanied by simple, practical work. It was concluded that using worksheets based on the ExPRession learning model was effective for training students' hands-on activity skills.
Bibliometric Analysis of Household Physics in Scopus Database: Approaches with Bibliometrix R-package and VOSviewer (Review of Literature on Home Physics Education)
Authors: Majid Fatra Faiza , Buyamin Buyamin
Published: December 2024

This study conducts bibliometric research using the Bibliometrix R-package analysis and VOSviewer to analyse Scopus databases from 1921 to 2024, specifically focusing on physics and households. It aims to determine the number of writings on home physics education in scientific publications, analyse publication trends, identify prolific authors, identify frequently used keywords and subject areas, and identify the countries that make the most contributions to publication. The research study found one article and was the only one published in 1921, entitled "The Evolution of Nerve Muscle Mechanisms" written by Russell S.B. Davies M and Kutner R were the two most productive authors, "radon" became the most widely used author keyword in publications. Physics and astronomy became the topics of the most frequently appearing publications. The U.S. emerged as the largest publisher and the most collaborative among the countries involved in the publication. Moreover, Indonesia has become the fifth-largest publisher in the world. Out of all the study papers, only five addressed home physics education. To encourage researchers, lecturers, and students to publish findings and research results linked to household physics in international scientific journals, it is believed that the findings of this study will be useful to higher education and research institutes.
Advancement of Conceptual Change in Physics Education from 2018-2024: A Literature Review
Authors: Aryani Siska Dewi , Novia Hera , Setiawan Andhy , Samsudin Achmad
Published: December 2024

Conceptual change (CC) occurs when students move from incorrect to scientifically accepted ideas. This article presents an overview of 47 international journal articles on the journal index, theoretical framework, purpose, data analysis, and research recommendations published between 2018-2024. This review resulted in five statements: 1) indexation of the journal used by the source of conceptual change studies; 2) the theoretical framework utilized in conceptual change; 3) the objectives used in conceptual change research; 4) data analysis used in research methodology; and 5) recommendations for various studies used by researchers to develop further. Based on this study, the authors recommend future empirical studies related to using a more specific theoretical framework in intervention learning, exploring deeper conceptual changes in the affective and social domains and examining the relationship between the role of metacognitive strategies and conceptual change.
Development of Student Worksheets Based on Guided Discovery Learning Assisted by Tracker Video Analysis on Mechanical Energy Conservation Material
Authors: Rahman Luthfi , Aripin Aripin , Makiyah Yanti Sofi
Published: December 2024

Student worksheets based on guided discovery learning assisted by a tracker video analysis on mechanical energy conservation materials were developed to provide experience in learning physics on conservation material mechanical energy. This research aims to produce a product in the form of the student worksheets based on guided discovery assisted by tracker video analysis. Studying this is research and development (R&D), using the ADDIE model, which consists of 5 stages: analysis, design, development, and implementation. This study uses quantitative data and qualitative data. Quantitative data results from the validation sheet and questionnaire responses of students and teachers. Then, qualitative data will be collected as suggestions, comments, and criticism from the validator regarding the development of the student worksheets. Data collection techniques using interviews and observations. The instrument used is a validation sheet for three validators: media, material, and language experts. This research was held at the Riyaluul Ulum High School. The research subjects were physics teachers and students of class X MIPA. The sample consisted of 130 students who were taken using simple random sampling and two teachers. Data analysis technique using descriptive statistics to determine validity and practicality. The results showed that the average value of media validation was 83% and categorized as very valid, material validation was 82% and categorized as very valid and language validation was 77% and categorized as valid. The results of the practicality assessment by students is 80% with the category of practical, and by the teacher is 86% very practical. The results of this study state that it can be used and implemented in the learning process.
The Effect of Digital Worksheets on Dynamic Fluids with Authentic Learning in Training Problem-Solving Skills
Authors: Wati Mustika , Lestari Dwi Mugi , Mahtari Saiyidah
Published: December 2024

Considering the importance of problem-solving skills in the 21st century, students should be trained in these skills, especially in sciences such as physics. Therefore, teaching materials such as worksheets are needed to train these skills. This study aims to describe the effect of digital worksheets on dynamic fluids with authentic learning in training students' problem-solving skills. The type of research used is pre-experimental with a one-group pretest-posttest design, with research subjects consisting of students in one of the XI MIPA classes in Barito Kuala Regency. The research data was collected through problem-solving skill tests before and after using the digital worksheets with the same material and then analyzed using normalized N-gain or gain scores. The results showed that the effect of the digital worksheets was in the high category with an N-gain score of 0.75, and students reached a good category in problem-solving skills. Therefore, it can be concluded that the digital worksheets on dynamic fluids with authentic learning effectively train students' problem-solving skills and can be used as input for teachers to train students' problem-solving skills.
Development of Student Worksheets on Dynamic Fluids Material to Improve Science Literacy
Authors: Isnaniah Rizki Maulidia , Miriam Sarah , Suyidno Suyidno , Qamariah Qamariah
Published: December 2024

Science literacy is one of the skills and competencies needed in physics learning. However, literacy skills need to be well-practised and have received little attention from schools. This research aims to develop science literacy-based student worksheets that are valid, practical, and effective and, therefore, appropriate for improving students' science literacy. This development study uses the ADDIE development model, which includes analysis, design, development, implementation, and evaluation. The study used a one-group pre-test and post-test method with 35 students from class XI MIPA 4 at SMAN 8 Banjarmasin. Data collection instruments included validation, lesson plan observation sheets, and learning outcome tests. Data analysis techniques involved calculating the average score on validation and practicality results, which were then analyzed descriptively based on achievement categorization. The effectiveness analysis used the N-Gain formula. The research results indicate that (1) The student worksheets and learning outcome tests are valid with excellent criteria; (2) The student worksheets and learning outcome tests are practical with excellent implementation criteria; (3) The student worksheets and learning outcome tests are effective, as indicated by an N-Gain science literacy score of 0.58, categorized as moderate. Based on these results, the science literacy-based physics worksheets on dynamic fluids material that were developed are declared feasible and can be used in the learning process to improve students' science literacy. The developed worksheets offer an alternative for enhancing students' science literacy.
Implementation of Formative Assessment in Physics Learning to Improve Students' Conceptual Understanding
Authors: Nabila Putri , Wahyuni Veni , Festiyed Festiyed , Emillianur Emillianur
Published: December 2024

This research examines the application of formative assessment to physics learning to increase students' conceptual understanding. This literature review includes publications from 2014 to 2024 taken from Google Scholar and GARUDA, with 14 articles taken with appropriate criteria. The research results show that using technology-based formative assessments, such as Google Forms, TikTok videos, multimedia modules, and web-assisted assessment systems, effectively increases students' conceptual understanding and motivation. This approach provides fast and precise feedback, identifies misconceptions, and supports students' scientific argumentation abilities. Overall, applying formative assessment and integrating technology in physics learning is important in deepening students' understanding of concepts.
Learning Styles in Science Education a Decade of Research (2012-2022): A Literature Review
Authors: Safitri Fibriyana , Rusdiana Dadi , Samsudin Achmad , Widiyatmoko Arif
Published: December 2024

This study reviews 50 articles on learning styles in science education, focusing on approaches, media, and learning models from 2012-2022. Every single student with different intelligence certainly has a different learning style. Learning styles provide knowledge about various ways of student learning and important information about student preferences; consequently, they can be utilized to optimize student learning processes. Integrating learning styles in the learning process aims to facilitate students with certain learning styles; therefore, their achievements can be improved sharply. The method of this research is SLR (systematic literature review) with the following phases: (1) determining research questions; (2) determining criteria; (3) generating a framework for articles; (4) searching, filtering, and selecting the data; (5) analyzing and interpreting the content of each reviewed article. This study discusses the distribution of research focused on the attributes of the content, the topics covered in the implementation of learning styles in science education, and the characteristics of existing learning style-based learning media. In conclusion, a literature review has been carried out on learning styles in science education.
IoT Light Switch Project in Smart Home to Enhance Concept Mastery of Vocational High School Students
Authors: Wulandari Catur , Purwaningsih Endang , Parno Parno
Published: December 2024

This research aims to improve vocational school students' mastery of dynamic electricity through STEM-PJBL learning in the TPACK framework. This dynamic electrical material is important for vocational school students in Technology and Information expertise because it is the basis for productive vocational learning at the next level. Facts in the field show that the mastery of the concept of vocational school students still needs to improve. Thus, to increase the mastery of the concept, a web-based interactive media, Google Sites, was used with a student project to prototype an IoT light switch on a smart home. This study is a pseudo-experimental research with a pretest-posttest group design with 32 students in class X TJKT. The results of this study show that STEM-PJBL learning in the TPACK framework can significantly increase concept mastery (sig 2-tailed < 0.05) with Ngain by 0.59.
Enhancing Students' Collaboration Skills Through Tic-Tac-Toe in Think Pair Share Strategy of Global Warming Concepts
Authors: Hidayah Nurul , Fatmaryanti Siska Desy , Ashari Ashari
Published: December 2024

Developing students' collaboration skills is important in today's 21st-century education. Global warming is one of the important issues in physics learning that is interesting to study. This study aims to improve students' collaboration skills by integrating Tic-Tac-Toe game with Think-Pair-Share (TPS) strategy in physics learning on the concept of global warming. This research adopted the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation) conducted at MA Al Iman Bulus Purworejo, starting with a limited trial involving 5 students and continuing to implementation with 34 students. The research instruments included validation sheets for developing student worksheets, observation sheets for collaboration skills, and student response questionnaires to collect comprehensive data on the effectiveness of the intervention. The data analysis results showed that the electronic worksheet's validity obtained a score of 3.86 with a valid category, and the practicality of the electronic worksheet based on the student response questionnaire obtained an average of 84.1% with a very practical category. The research findings revealed that integrating Tic Tac-Toe with TPS strategy can improve students' collaboration skills from the ibservation score of 44.5 to 87.3. The N-gain was 0.8, which is included in the high category. Using games in learning with cooperative learning strategies such as TPS accompanied by worksheets is proven to provide students with an interactive and fun approach to mastering collaboration skills and global warming concepts.
Development of CTIL Model Textbooks Based on H5P Application to Improve Students' Critical Thinking Skills
Authors: Hasyim Faiz , Wibowo Hari Anggit Cahyo , Wilujeng Indrawati , Anwar Mohammad Syaiful
Published: December 2024

21st Century Skills are key competencies crucial for students to thrive and succeed in the future. Critical thinking skills are one of the urgent 21st-century skills. Students' critical thinking skills must be trained with the right learning models and textbooks. This study aims to develop a valid and practical H5P-based Critical Thinking-Independent Learning (CTIL) textbook to improve students' critical thinking skills. The research instruments were textbook validation sheets and textbook readability questionnaires. The data analysis used quantitative descriptive techniques. Quantitative descriptive analysis was carried out on the results of experts' validation and the textbook readability questionnaire. Based on the results of the research conducted, it was found that the validation result from the material expert was 3.81 in the very valid category, from the language expert was 3.80 in the very valid category, and from the media expert was 3.23 in the valid category. The results of the textbook readability questionnaire stated that the textbook was easy to understand, easy to use, and interesting, and students enjoyed using the H5P-based CTIL textbook with an average percentage of 82% in the very high category. Based on the results of the analysis, it can be concluded that the developed H5P-based CTIL textbook is valid and practical. Further research can be conducted by empirically testing the H5P-based CTIL textbook to determine its practicality in science learning broadly.
PENGARUH MEDIA PENDINGIN DAN DEEP OF CUT TERHADAP KEKASARAN PERMUKAAN AL6063 PADA BUBUT KONVENSIONAL
Authors: Rachmandani Rizky , Tamjidillah Mastiadi
Published: December 2024

Penelitian ini bertujuan untuk mengetahui serta menganalisis pengaruh media pendingin soluble cutting oil dan air terhadap kekasaran permukaan aluminium 6063 menggunakan mesin bubut konvensional. Adapun prosedur penelitian adalah sebagai berikut : (1) proses pembuatan spesimen; (2) pengujian spesimen; (3) variabel penelitian dan (4) pengambilan data lapangan. Adapun hasil dari penelitian ini ditemukan bahwa pengaruh media pendingin soluble cutting oil dan air dengan variasi deep of cut terhadap nilai kekasaran permukaan aluminium 6063 memiliki nilai kekasaran yang berbeda antara soluble cutting oil dan air. Dimana media pendingin soluble cutting oil dengan Deep of cut 0,5 didapatkan tingkat kekasaran yang lebih baik dengan angka 0,942 μm, sedangkan deep of cut 0,7 menggunakan air didapatkan tingkat kekasaran yang lebih baik dengan angka 1,136 μm. Pengaruh karakteristik hasil deep of cut pada aluminium 6063 memiliki hasil permukaan sayatan yang berbeda-beda, dimana pada setiap sampel hasil pengamatan dengan variasi deep of cut. Semakin kecil deep of cut yang digunakan maka hasil sayatan permukaan akan semakin halus dan semakin besar deep of cut yang digunakan maka akan semakin kasar permukaan yang dihasilkan. The aim of this research is to determine and analyze the effect of soluble cutting oil dan water cooling media on the surface roughness of 6063 aluminum using a conventional lathe. The research procedures are as follows: (1) specimen making process; (2) specimen testing; (3) research variables dan (4) field data collection. The results of this research found that the effect of cooling media Soluble cutting oil and water with variations in depth of cut on the surface roughness value of aluminum 6063 has different roughness values between soluble cutting oil and water. Where the Soluble cutting oil cooling media with a Deep of cut of 0.5 obtained a better roughness level with a figure of 0.942μm, while the depth of cut of 0.7 using water obtained a better roughness level with a figure of 1.136μm. The influence of the characteristics of the depth of cut results on aluminum 6063 has different cut surface results, where in each sample the results are observed with variations in the depth of cut. The smaller the depth of cut used, the smoother the surface incision will be dan the greater the depth of cut used, the rougher the resulting surface will be.
KARAKTERISTIK HASIL PENGECORAN DIE CASTING PADUAN ALUMUNIUM TEMBAGA (Al-Cu)
Authors: Pranata Edy , Maruf Maruf
Published: December 2024

Aluminium merupakan logam non-besi yang bahan dasarnya adalah bauksit dan kreol. Logam lebih dari setengahnya terdiri dari unsur-unsur kimia. Salah satu jenis logam yang paling berguna dalam industri adalah paduan Al-Cu yang biasa digunakan untuk penempaan tugas berat, pemasangan pesawat terbang, dan rangka truk. Pengecoran merupakan cara tertua dalam proses pembentukan logam. Pengecoran logam tebal atau die casting adalah pengecoran bertekanan dimana logam ditekan ke dalam cetakan dalam kondisi mendekati titik beku. Proses Die Casting dilakukan variasi suhu penuangan (650°C, 670°C dan 690°C), tekanan ( 0, 2,5, 5 dan 7,5 MPa) dengan waktu pengadukan 90 detik. Sedangkan hasil pengujian nilai kekerasan, kekerasan tertinggi terhadap suhu penuangan dengan hasil 650°C sebesar 86 HB dan terendah pada suhu 690°C sebesar 58 HB dan kekerasan terhadap tekanan tertinggi dengan hasil 7,5 MPa sebesar 86 HB pada suhu 650°C dan terendah tanpa tekanan sebesar 58 HB pada suhu 690°C. Semakin tinggi temperatur penuangan semakin menurun nilai kekerasan dan semakin besar tekanan semakin tinggi nilai kekerasan spesimen. Aluminum is a non-ferrous metal whose basic ingredients are bauxite and creole. Metal is more than half composed of chemical elements, One of the most useful types of metal in the industry is Al-Cu alloy commonly used for heavy-duty forging, aircarft fitting and truck frame. Casting is the oldest way to process metal forming. Thick metal casting or die casting is pressure casting where the metal is pressed into the mold in near freezing conditions.The Die Casting process carried out variations in pouring temperatures of (650°C, 670°C and 69 °C), pressures of (0, 2.5, 5 and 7.5 MPa) with a stirring time of 90 seconds. While the results of testing the value of hardness, the highest hardness to pouring temperature with the results of 650°C of 86 HB and the lowest at 690°C of 58 HB and the highest hardness to pressure with a result of 7.5 MPa of 86 HB at 650oC and the lowest without pressure of 58 HB at temperature of 690oC. The higher the pouring temperature, the lower the hardness value and The greater the pressure, the higher the hardness value of the specimen.
PENGARUH MODIFIKASI KOMPRESI RUANG BAKAR PADA MOBIL HEMAT ENERGI
Authors: Wahyudi Ikhsan , Humaidi Khairi
Published: December 2024

Tujuan dari penelitian ini adalah untuk membandingkan penggunaan bahan bakar khusus dari sepeda motor 4 langkah yang telah dimodifikasi dengan rasio kompresi 9,2 : 1, menggunakan bahan bakar jenis pertalite. Penelitian ini dilakukan melalui metode eksperimen yang melibatkan sepeda motor Honda Beat FiData hasil penelitian dianalisis melalui tiga percobaan dengan RPM 1500, 2500, dan 3000. Setiap percobaan menggunakan 100 ml bahan bakar pertalite untuk mengevaluasi konsumsi bahan bakar, yang kemudian dihitung. Hasil penelitian menunjukkan adanya perbedaan konsumsi bahan bakar spesifik dari ketiga variasi penggunaan RPM saat berkendara. Percobaan pertama dilakukan pada rentang RPM 1000-1500 dengan beban total kendaraan 200 Kg, menghasilkan konsumsi bahan bakar 2,3 Km/100 ml (23 Km/L) pada kecepatan 11 Km/j. Percobaan kedua pada rentang RPM 1500-2500 dengan beban yang sama menghasilkan konsumsi 3,5 Km/100 ml (35 Km/L) pada kecepatan 40 Km/j. Percobaan ketiga pada rentang RPM 2500-3000 dengan beban yang sama menghasilkan konsumsi 3,2 Km/100 ml (32 Km/L) pada kecepatan 65 Km/j. Penurunan RPM secara signifikan mempengaruhi konsumsi bahan bakar, di mana semakin rendah RPM, semakin tinggi kebutuhan bahan bakar. This study aims to compare the specific fuel consumption of modified 4-stroke motorbikes with a compression ratio of 9.2: 1 using pertalite fuel. The experimental method was carried out on a Honda Beat Fi motorbike. The research data was analyzed through three experiments with RPM 1500, 2500, and 3000. Each experiment used 100 ml of pertalite fuel to evaluate fuel consumption, which was then calculated. The research results show that there are differences in specific fuel consumption from the three variations in RPM use when driving. The first experiment was carried out in the RPM range 1000-1500 with a total vehicle load of 200 Kg, resulting in fuel consumption of 2.3 Km/100 ml (23 Km/L) at a speed of 11 Km/h. The second experiment in the RPM range 1500-2500 with the same load resulted in a consumption of 3.5 Km/100 ml (35 Km/L) at a speed of 40 Km/h. The third experiment in the 2500-3000 RPM range with the same load resulted in a consumption of 3.2 Km/100 ml (32 Km/L) at a speed of 65 Km/h. Reducing RPM significantly affects fuel consumption, where the lower the RPM, the higher the fuel requirement.
PENGARUH JENIS BASE OIL TERHADAP SUHU MESIN DAN KONSUMSI BAHAN BAKAR PADA MESIN 4-TAK 100 CC
Authors: Oktarinda Muhammad Dwiki , Misbachudin Misbachudin , Nur Raybian
Published: December 2024

Untuk memastikan efisiensi yang optimal dari tenaga yang dihasilkan melalui pembakaran, diperlukan sistem pelumasan yang tepat. Secara umum, fungsi utama pelumas ialah sebagai perantara mengurangi gesekan dan keausan. Sistem pelumasan pada mesin kendaraan penting, karena kualitas sistem pelumasan mempengaruhi kinerja dan umur mesin. Penelitian ini bertujuan untuk menganalisis pengaruh variasi jenis base oil terhadap suhu mesin dan konsumsi bahan bakar pada mesin mobil hemat energi. Penelitian dilakukan dengan menggunakan tiga jenis base oil yaitu oli mineral grup 2, oli semi sintetik, dan oli full sintetik dengan viskositas SAE 10W-30. Pengujian dilakukan pada mesin bensin 4 tak berkapasitas 100cc dengan bahan bakar pertamax. Pengukuran dilakukan pada putaran idle ±1500 rpm selama 10 menit. Hasil penelitian menunjukkan bahwa jenis base oil berpengaruh terhadap suhu mesin dan konsumsi bahan bakar. Oli full sintetik memberikan performa terbaik dengan suhu mesin yang lebih rendah dan konsumsi bahan bakar yang lebih efisien dibandingkan dengan oli mineral grup 2 dan oli semi sintetik. To ensure optimal efficiency from the power generated through combustion, an appropriate lubrication system is necessary. In general, the main function of lubricants is to act as intermediaries in reducing friction and wear.  The lubrication system in vehicle engines is crucial as its quality affects the performance and lifespan of the engine. This study aims to analyze the influence of variations in base oil types on engine temperature and fuel consumption in energy-efficient car engines. The research was conducted using three types of base oils: Group 2 mineral oil, semi-synthetic oil, and full synthetic oil, all with a viscosity of SAE 10W-30. Testing was performed on a 100cc 4-stroke gasoline engine using pertamax fuel. Measurements were taken at an idle speed of approximately 1500 rpm for 10 minutes. The results showed that the type of base oil significantly affects engine temperature and fuel consumption. Full synthetic oil provided the best performance with lower engine temperatures and more efficient fuel consumption compared to Group 2 mineral oil and semi-synthetic oil.
PENGUKURAN POTENSI ENERGI MATAHARI DAN PERANCANGAN PLTS TERHUBUNG JARINGAN PADA GEDUNG LABORATORIUM TEKNIK 1 ITERA
Authors: Harmiansyah  , Putra Pramana , Nuruli Febmartini Evita , Hadi Fahmi Sapta , Inrum Putri Aâ€™isyati , Saputra Rizki Octa , Saputra Muhammad Atma , Efendi Rustam
Published: December 2024

Energi matahari merupakan energi yang dapat diperbaharui terus-menerus serta ramah lingkungan. Perancangan PLTS dapat dilakukan dengan mengetahui nilai potensi sinar matahari pada suatu wilayah, panel surya memiliki cara kerja mengonversi radiasi matahari menjadi energi listrik. Tujuan dari penelitian ini adalah menganalisis potensi energi matahari, perancangan modul surya berbasis on grid pada atap gedung Laboratorium Teknik 1 dan menganalisis biaya investasi awal serta pemeliharaan PLTS. Metode penelitian ini dilakukan dengan mengukur besar energi matahari menggunakan alat solar power meter, merancang sistem PLTS terhubung jaringan dengan software PVSys dan perkiraan biaya. Berdasarkan hasil penelitian didapatkan Global Horizontal Irradiance dengan nilai rata-rata sebesar 1705,1 W/m2, Direct Radiation sebesar 1662,2 W/m2, Diffuse Radiation sebesar 187,28 W/m2, dan Albedo Radiation sebesar 0,10897. PLTS yang dirancang membutuhkan nilai total investasi awal sebesar Rp 699.352.092,-. Biaya pemeliharaan dan operasional per tahun untuk PLTS yang akan dibangun di atap Laboratorium Teknik 1 sebesar Rp  6.993.520.92, - per tahun. Diperkirakan usia panel surya mencapai 25 tahun maka total biaya pemeliharaan dan operasional sebesar Rp 174.838.023,-.
ANALISIS CETAKAN PLASTIK INJEKSI SPESIMEN UJI TARIK MELALUI SIMULASI PLASTIK INJEKSI MENGGUNAKAN AUTODESK FUSION 360
Authors: Supandi  , Gamayel Adhes , Kasum  , Mulyono Sidik , Zaenudin Mohamad
Published: December 2024

Plastik injeksi (injection molding) merupakan sebuah metode pembentukan produk dari biji plastik menjadi berbagai produk kebutuhan sehari-hari. Dalam hal penunjang kebutuhan sehari-hari, produk hasil cetak plastik injeksi harus memenuhi kriteria, seperti kekuatan, keuletan, kelenturan, kekerasan, dsb. Salah satu cara yang paling mudah adalah dengan melakukan uji tarik. Pada penelitian ini, pembuatan cetakan untuk produk spesimen uji tarik dilakukan melalui beberapa tahapan proses, yaitu perancangan dan simulasi, fabrikasi, dan uji produk. Software Autodesk Fusion 360 digunakan dalam proses perancangan untuk mensimulasikan dan memprediksi aliran material saat proses injeksi ke dalam cetakan dengan beberapa variasi parameter berupa waktu, suhu material, dan suhu cetakan. Hasil yang didapatkan yaitu dengan menggunakan material plastik polypropylene (PP), kondisi injeksi yang maksimal yaitu menggunakan suhu pelelehan 230Â°C dan suhu cetakan 50Â°C dengan waktu injeksi 14.5 detik, di mana diprediksi produk mudah terisi dan kualitas yang dihasilkan mencapai 100% baik. Penelitian ini telah berhasil melakukan perancangan dan memprediksi proses injeksi plastik yang dapat dimanfaatkan dalam proses pencetakan plastik melalui proses injeksi sesungguhnya di industri yang menggunakan material polypropylene (PP).
PERANCANGAN JARI PROSTETIK UNTUK PENYANDANG TUNA DAKSA BERBASIS SENSOR SENTUH DAN ARDUINO UNO
Authors: Ulan Rufaida Fatkhul Janna , Nurâ€™Aidha Amalia C. , Kumarajati Dhananjaya Y.H , Agisna Faza , Chaerunisa Salsabilla Thallah
Published: December 2024

Metode rehabilitasi penyandang tuna daksa dapat dilakukan dengan memanfaatkan alat bantu pergerakan atau prostetik. Namun, jari prostetik kebanyakan yang ada dipasaran hanya fokus pada fungsi estetiika tanpa memperhatikan fungsi mekanika jari sehingga tidak semua penyandang tuna daksa yang kehilangan jari bisa memanfaatkan berbagai jenis jari prostetik. Tujuan dari penelitian ini adalah mengembangkan desain jari prostetik menjadi lebih terjangkau bagi para disabilitas dengan tingkat akurasi dan menghasilkan produk jari prostetik yang memiliki kinerja dan kekuatan yang baik, serta sesuai dengan kebutuhan dan keinginan pengguna. Penelitian ini melibatkan metode ekperimen dan pengujian berulang. Penggunaan jari prostetik ini dibatasi pada penyandang tuna daksa untuk jari tanganyang kehilangan jari tangan. Keberhasilan dalam penelitian ini menunjukkan bahwa komponen yang digunakan pada jari prostetik  berfungsi dengan baik hingga jari prostetik dapat bergerak 127 hingga 162 milidetik dimana nilai yang lebih dari 150 milidetik hanya terdapat 2 kali pada percobaan ke 7 dan 8 selain dari itu semuanya kurang dari 150 milidetik yang mana masuk dalam kategori sangat memuaskan. Dengan begitu dapat dikatakan tingkat akurasi dari jari prostetik ini sebesar 98%.
OPTIMIZATION OF ULTRASONIC WELDING MACHINE PARAMETERS FOR JOINING THERMOPLASTIC MATERIALS
Authors: Mulyadi Dodi , Sukarman Sukarman , Amir Amir , Sofiyanti Bella , Nugroho Azis Adhi
Published: December 2024

Ultrasonic welding is the joining of materials using of heat generated from high frequency mechanical movements. Known as an efficient process in many applications, such as in textile, packaging and automotive industries. One of the materials that can be joined using ultrasonic welding is thermoplastic material because there is no polymer degradation found in the product after the welding process. In most practices, parameters determining for ultrasonic welding machines uses a trial and error method, several parameters are determined to vary, such as welding pressure, welding time, holding time, drop speed and trigger pressure. To determine the correct variation of values, the Taguchi method is the right choice, determining the variable matrix is â€‹â€‹very easy, commonly used, and many studies have proven that the Taguchi method is reliable. In this research, the product to be studied is a medical device, which uses thermoplastic polymer as its material. This research has produced the best variable variation of ultrasonic welding machine parameters: welding pressure of 20.00 psi; welding time of 0.21 seconds; holding time of 0.16 seconds; horn descent speed of 3.00 seconds; and trigger pressure of 4.00 psi. The defective products on appearance had reduced to 0.07% from the previous 1.08%.
ANALISIS KEKUATAN MEKANIK KOMPOSIT LIMBAH PLASTIK RECYCLE SINGLE USE DAN SERBUK KAYU
Authors: Aundry Tsalsa , Munang Aswan
Published: December 2024

Pengembangan material dapat meminimalkan dampak terhadap lingkungan selama siklus hidupnya. Siklus hidup dimulai dari komposisi bahan mentah, proses produksi, penggunaan dan sistem daur ulang. Komposit disusun menggunakan material limbah sedotan plastik dan serbuk kayu menggunakan matriks resin polyester. Pembuatan spesimen komposit dengan pencetakan compressing molding menggunakan press hydraulic kapasitas 12 ton. Pembuatan spesimen dengan tiga fraksi volume berbeda. Spesimen satu (sedotan plastik 30%, serbuk kayu 70%), spesimen dus (sedotan plastik 40 %, serbuk kayu 40 % dan matriks polyester 20 %) serta spesimen tiga (matriks polyester 70 %, serbuk kayu 30%). Pengujian tarik dilakukan enam kali menggunakan standar ASTM D3039 dengan mesin Computer Servo hydraulic universal testing machine. Pengujian impact dilakukan enam kali dengan ASTM D256 menggunakan mesin charpy impact tester. Berdasarkan hasil pengujian, dapat diketahui bahwa komposisi material 40% serbuk kayu, 40% sedotan plastik, dan 20% matriks polyester memiliki kekuatan pengujian tarik dan impact optimal. Hasil pengujian tarik dan impact berturut-turut 16 N/  dan 1,27 Joule. Perpaduan ikatan antar matriks dan serat material dengan tiga variasi komposisi dapat dijadikan salah satu alternatif dalam pengembangan material maju dan ramah lingkungan.
RANCANG BANGUN SISTEM PERINGATAN KANTUK PADA PENGENDARA SEPEDA MOTOR BERBASIS FUZZY LOGIC
Authors: Samosir Daniel Moses , Setyaji Aditya Bayu , Ramdhani Ramdhani , Sukrawan Yusep
Published: December 2024

Pengendara sepeda motor pada dasarnya dituntut untuk mengemudikan kendaraan dengan kesadaran mengenai perilaku tertib di jalan. Namun faktanya masih banyak kecelakaan sepeda motor disebabkan oleh kelalaian, salah satunya adalah rasa kantuk saat berkendara. Penelitian ini bertujuan untuk mengembangkan alat pencegah kantuk berbasis logika fuzzy bagi pengendara sepeda motor. Alat ini melewati 4 tahap pengujian yaitu catu daya, sensor, mikrokontroler dan aktuator. Hasil pengujian alat ini adalah catu daya pada alat ini berfungsi dengan baik, alat pada sepeda motor dan helm berfungsi dengan baik sesuai program yang dirancang pada mikrokontroler, sensor denyut nadi yang dirancang untuk sepeda motor tidak berfungsi sebagaimana mestinya, maka untuk penelitian sementara digunakan sensor Max 30100 sebagai pembaca denyut nadi, buzzer, vibrator dan relay pada alat ini berfungsi dengan baik dan lebih akurat dibandingkan dengan penelitian sebelumnya sesuai aturan fuzzy yang telah diprogram. Penggunaan sensor dipergelangan tangan terbukti efektif mendeteksi denyut nadi, sehingga akurasi pembacaan kantuk selaras dengan pembacaan denyut nadi yaitu 100% yang merupakan tindak lanjut dari penelitian sebelumnya. Fuzzy logic pada perangkat berpengaruh pada kerja mikrokontroler menjadi akurat sesuai dengan yang telah di program.
ANALISIS PROSES PIROLISIS LIMBAH PLASTIK HDPE DAN PET: PENGARUH TEMPERATUR DAN WAKTU REAKSI DALAM UPAYA DAUR ULANG PLASTIK
Authors: Sabitah A yan , Ardiyat Ichwan Noor , Misbachudin Misbachudin , Wusko Ikna Urwatul , Ningsih Rahma Pitria
Published: December 2024

Sampah plastik menimbulkan tantangan lingkungan yang signifikan, namun pengelolaannya masih belum sepenuhnya efektif. Metode umum seperti pembuangan, pembakaran, atau daur ulang masih memiliki keterbatasan, terutama risiko senyawa berbahaya dari pembakaran plastik bertemperatur rendah. Oleh karena itu, penelitian terus mencari solusi yang lebih baik. Pirolisis, penguraian molekul plastik pada temperatur tinggi dalam lingkungan gas inert, muncul sebagai pendekatan yang menarik untuk daur ulang plastik. Proses pirolisis menghasilkan fase padat, cair, dan gas. Hasil berupa cairan tersebut berpotensi sebagai biofuel setelah pemurnian lebih lanjut. Penelitian ini berfokus pada pengaruh temperatur dan waktu pada pirolisis plastik HDPE dan PET. Hasil akhir dari pirolisis mencakup tar/cair dan char/arang, dimana HDPE 3 kg menghasilkan tar terbanyak sebesar 973 ml, sementara PET 3 kg paling sedikit sebesar 89 ml. HDPE juga menghasilkan char terbanyak sebesar 1,272 kg, sedangkan campuran 1,5 kg HDPE dan PET menghasilkan char paling sedikit sebesar 0,326 kg. Secara keseluruhan, distribusi panas yang merata dan temperatur optimal sangat penting untuk meningkatkan efisiensi dan kualitas produk pirolisis.
TRENDS IN DEMOGRAPHIC PROCESSES: MARRIAGE, DIVORCE, AND BIRTH RATES WITHIN THE KURSK REGION IN 2012–2022
Authors:   Kursk State Medical University, BREUSOV ALEKSEY V. , RYNDINA VERA V. ,   Kursk State Medical University, SOLYANINA VICTORIA A. ,   Kursk State Medical University, SHULAEV ALEKSEY V. ,   Kazan State Medical University, OLEYNIKOVA TATYANA A. ,   Kursk State Medical University, STEPANOVA ANASTASIA V. ,   Kursk State Medical University
Published: December 2024

Introduction. The demographic situation in the country depends on many factors and processes of
population reproduction in the regions, including in the Kursk region. Monitoring marriage, divorce, and birth rates will
allow quickly making managerial decisions, which will contribute to the development of the region in all areas, including
developing and adjusting programs aimed at supporting families and marriage and increasing birth rates. Aim. Analysis
of trends in marriage, divorce, and birth rates in the Kursk region in 2012-2022. Materials and Methods. The study of
demographic processes using official data from the State Statistics Service of Russia in the Central Federal District and
in the Kursk Region, as well as the findings of a sociological survey of medical university students’ opinions regarding
family planning, allows us to most fully assess the trends in demographic processes occurring in these territories.
Results and Discussion. A negative trend has been established in the dynamic series of marriage rates in the Kursk
region (the average growth rate of the overall marriage rate is 10.9%). This figure was the lowest in 2020 – at the time
of COVID-19. High marriage rates were identified in 2021 and 2022. The number of divorces during the study period
increased by 2.4%. Over the past two years, there has been an increase in the number of divorce cases. The lowest
overall divorce rate was recorded in 2020. The average birth rate growth was 4.2%. Over the entire period of this study,
out-of-wedlock birth rates decreased on average by 1.4% in the Kursk region. KSMU students plan to start a family
in 84.0% of cases, 89.9% of respondents equate cohabitation with official marriage, and 80.0% are ready to live in
an informal relationship. 78.0% of respondents expressed the opinion that intimate relationships before marriage are
a personal matter for everyone. The survey of the KSMU students revealed that the most respondents are ready to
have a family with two children (47%). Conclusions. The decline in the overall marriage rate is associated with the
transformation of family values and starting families without being officially registered with the civil registry office. The
majority of KSMU students surveyed are ready to live in informal relationships, which may result in the increased out-
of-wedlock birth rates, currently decreasing in the Kursk region. Direct correlations have been established between
general marriage rates with divorce and birth rates (p ≤ 0.05).