Jurnal Online Universitas Muhammadiyah Purwokerto
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Addition of Hydrogen in Spark Ignition Engine Combustion Process: A Review
No full textThe increasing consumption of fossil energy causes fossil energy reserves to become depleted and pollutants in the environment increase. One approach to decreasing reliance on fossil fuels is through the use of renewable energy sources. Hydrogen can serve as a substitute fuel option. One of the uses of hydrogen as a renewable fuel is as an addition to gasoline combustion engines. This study includes a review of previous research on the addition of HHO to gasoline engines on the parameters of power, torque, specific fuel consumption, thermal efficiency, and exhaust emissions. The results of a review of previous studies show that the addition of HHO to gasoline engines can increase engine output power, torque, and thermal efficiency and can reduce combustion exhaust emissions and the addition of hydrogen can reduce specific fuel consumption
Pengaruh Heat Treatment terhadap Mikrostruktur dan Kekerasan pada Material Low Carbon Stell ST-37
Get PDFMaterial low carbon steel ST-37 menjadi salah satu material yang prospektif untuk dikembangkan dalam berbagai aplikasi perkapalan diantarannya lambung kapal. Namun disisi lain diperlukan treatment guna meningkatkan ketangguhan serta kekuatannya yang sampai saat ini menjadi salah satu tantangan dalam fabrikasi material kapal. Oleh karena itu, pada penelitian ini telah dilakukan pengkajian tentang perlakuan panas pada material ST-37. Material low carbon steel ST-37 dihomogenisasi pada temperatur 800 ℃ selama 1 jam diikuti dengan pendinginan udara. Selanjutnya material diaustenisasi pada temperatur 850 ℃ dan 870 ℃ selama 15 menit kemudian di lakukan pendinginan cepat menggunakan media air. Sampel dikarakterisasi menggunakan XRD untuk mengidentifikasi fasa, pengujian metalografi dan uji kekerasan menggunakan microvickers. Hasil pengujian mikrsotruktur menunjukkan bahwa setelah perlakuan panas terjadi pembentukan fasa ferit acicular, retained asutenit dan pengecilan ukuran butir. Analisa struktur mikro dilakukan dengan proses metalografi menggunakan esta NaOH. Selain itu identifikasi fasa juga terkonfirmasi melalui pengujian XRD yang diketahui terdapat puncak dengan hkl fasa ferit α (111), α (200) dan α (220). Sedangkan fasa reatined austenit terkonfirmasi pada hkl γ (220). Hasil pengujian microvicekrs menunjukkan peningkatan kekerasan pada sampel yang telah diberikan perlakuan panas dari 129.53 HVN menjadi 308.2 HVN pada sampel 850 ℃ dan 312.5 HVN pada sampel 870 ℃ . Peningkatan kekerasan pada sampel terjadi melalui mekanisme penguatan batas butir dan presipitasi
Penambahan Arang Batok Kelapa ke Zeolit Alam untuk Filter Air Keramik
Get PDFCampuran zeolit alam dan arang tempurung kelapa ini dapat digunakan sebagai filter karena sifat fisik, kimia dan adsorbennya yang unik untuk cairan. Filter yang ada masih berupa partikel-partikel kecil yang disusun. Susunan partikel dapat berubah yang mebuat tidak maksimal penyaringannya. Perlu adanya inovasi pembuatan filter keramik berbahan baku zeolit alam-arang tempurung kelapa. Filter keramik berbahan dasar zeolit alam dan arang tempurung kelapa telah dibuat dengan cara sinterin pada suhu 900o C. Pada penelitian ini dilakukan perhitungan penyusutan, densitas dan porositas filter keramik. Hasil penyaringan diukur dengan flowabilitily dan nilai TDS (Total Dissolved Solid) air. Hasil penelitian ini menunjukkan bahwa semakin banyak campuran arang tempurung kelapa maka semakin tinggi susutnya, semakin rendah densitasnya, semakin tinggi nilai porositasnya, semakin tinggi debit airnya dan semakin rendah nilai TDS airnya. Penambahan arang batik kelapa terbukti mengurangi kandungan partikel dalam air meskipun memperbesar porosita
Konsep Kepemimpinan Profetik dalam Pendidikan Islam
Get PDFPenelitian ini bertujuan untuk memahami dan menganalisis konsep kepemimpinan profetik dalam pendidikan Islam. Dalam dunia pendidikan Islam, kepala madrasah adalah sebagai pemimpin suatu lembaga dan memegang peran penting dalam memberikan pengaruhnya kepada anggota-anggotanya. Salah satu konsep yang dapat diterapkan oleh kepala madrasah yaitu dengan melaksanakan konsep kepemimpinan profetik. Kepemimpinan profetik adalah pendekatan untuk memimpin seseorang dengan mengacu pada sifat dan prinsip kenabian. Kepemimpinan tersebut selain bersifat bersifat moral terhadap Sang Pencipta (ḥablun minallāh) di mana dia bertanggung jawab secara moral untuk kepemimpinannya, juga bersifat vertikal-formal atau ḥablun minannās, terhadap orang lain. Kepemimpinan profetik Islam harus mampu menerapkan dengan benar dan efektif dengan meneladani sifat-sifat kepemimpinan Nabi Muhammad Saw, yaitu siddīq, amanah, faṭanah, dan tablīg. Penelitian ini menggunakan pendekatan kualitatif dengan metode studi pustaka. Sumber yang digunakan yaitu buku-buku dan jurnal yang relevan. Kemudian data dianalisis dengan model Miles dan Huberman, yaitu kondensasi data, penyajian data dan penarikan kesimpulan. Penelitian ini memberikan kesimpulan bahwa dalam menerapkan kepemimpinan profetik terdapat beberapa cara, yaitu (1) memulai dan melakukan dari diri sendiri, (2) menjadi teladan, (3) berkomunikasi secara efektif, (4) memiliki kedekatan dengan umat, (5) memberi motivasi, (6) mampu mempengaruhi, dan (7) memiliki etika
Analisis Faktor - Faktor Penyebab Kesulitan Belajar Siswa Dalam Memahami Materi Pembelajaran Pada Mata pelajaran Matematika di Sekolah SMA BUDI MURNI 3 Medan
No full textMathematics is a subject often perceived as difficult by many students. The ability to understand mathematical concepts is crucial for students' success in this field. However, some students face challenges in grasping mathematical material. Learning disabilities are a common issue that may arise during the learning process. This study employs a descriptive quantitative research method, utilizing several data collection methods including closed-ended questionnaires and documentation. The research was conducted at Budi Murni 3 Catholic High School in Medan, located at Jalan Teratai No. 21a, Sidorejo District, Medan Tembung, North Sumatra. The population of this study consists of the 11th-grade social science (IPS) students at Budi Murni 3 Catholic High School, Medan. The findings indicate that the primary factors contributing to students' difficulties in understanding mathematics lessons at Budi Murni 3 Catholic High School are predominantly psychological. These include a tendency towards disinterest and a lack of engagement in learning mathematics, which in turn hampers their comprehension of the subject
ANALISIS CAMPUR KODE DALAM NOVEL “AYAH” KARYA NOVEL ANDREA HIRATA
Get PDFThe novel "Ayah" by Andrea Hirata is a literary work that depicts the complexity of life and the relationships between its characters against a rich cultural background. One of the distinctive characteristics of this novel is the use of code mixing, where the author combines various languages, dialects and styles to create a rich and authentic feel. In this analysis, we investigate the use of code mixing in the novel and its impact on cultural identity formation, character characterization, and readers' experiences. We use textual and contextual approaches to understand how code mixing is used by writers in the context of stories, as well as its effect on readers. The results of this analysis provide a deeper understanding of the complexity of this literary work and its contribution to the treasury of Indonesian culture and literature
UPAYA PENINGKATAN KERJASAMA PESERTA DIDIK MELALUI MODEL PEMBELAJARAN KOOPERATIF TIPE TEAM GAMES TOURNAMENT (TGT) PADA MUATAN PENDIDIKAN PANCASILA KELAS IV
No full textPenelitian ini bertujuan untuk mengetahui peningkatan kemampuan kooperatif siswa melalui media pembelajaran TGT (Team Games Tournament) mata pelajaran PKn pada siswa kelas IV SD Negeri 3 Purwanegara Kabupaten Banyumas. Jenis penelitian ini adalah penelitian tindakan kelas dengan dua siklus tindakan. Hasil penelitian ini menunjukkan bahwa penerapan model pembelajaran kooperatif tipe TGT (Team Games Tournament) dapat meningkatkan kemampuan kerja sama siswa. Dibuktikan dengan keaktifan hasil kolaborasi kelompok siswa pada kondisi prasiklus dengan kategori tingkat rendah dengan persentase sebesar 37%. Peningkatan pada siklus I pada tingkat kemampuan kerja dengan kategori sedang dengan persentase sebesar 54%. Dan pada siklus II kembali terjadi peningkatan, tingkat kemampuan kerjasama siswa berada pada kategori tinggi dengan persentase sebesar 86%.
UPAYA PENINGKATAN KAPASITAS PEMAHAMAN WISATA BERKELANJUTAN MELALUI SOSIALISASI BERSAMA MASYARAKAT DESA SRATI KEBUMEN
No full textThis study aims to find out the results of pretest and posttest of the community before and after socialization regarding sustainable tourism management. The research method used in this study is a quantitative method. The main problem faced by the people of Srati Village is the limitations in tourism management which has an impact on the low number of tourist visits. PPK Ormawa is expected to increase the capacity of the public to understand sustainable tourism management practices, encourage their active participation in environmental conservation, and strengthen their capacity to manage and utilize natural resources responsibly for tourism purposes. One of the efforts made is to hold socialization about sustainable tourism management with the community in Srati Village. The data used is primary data obtained from pre and posttest scores of 30 respondents. The data analysis techniques used are descriptive analysis and paired t-test. Through the paired t test, socialization regarding sustainable tourism management significantly increases public understanding. This can be seen from the increase in the average score from 57.33 in the pretest to 84.67 in the posttest. In addition, the lower standard deviation on the posttest (11.958 compared to 20.331 on the pretest) indicates that the posttest values are more consistent. The decrease in the standard error mean from 3.712 in the pretest to 2.183 in the posttest also shows that the average estimate of the posttest score is more accurate. Overall, these results show a positive effect of socialization on the capacity of public understanding regarding sustainable tourism management
PENERAPAN PENDIDIKAN KARAKTER DALAM PEMBELAJARAN MATEMATIKA UNTUK MENGEMBANGKAN KARAKTER PESERTA DIDIK DI MADRASAH IBTIDAIYAH
Get PDFThe purpose of writing this article is to analyze further the application of Character Education in mathematical learning to develop the character of learners in MI, because when viewed there are still many learners' behaviors that are still minimal in character education. In accordance with the objectives of Indonesian Education stated in law no. 20 of 2003 that the purpose of national Education is to develop the potential of learners. Hence the importance of Character Education early on, that is, starting from the bench of Madrasah Ibtidaiyah. Later, for the method used in this study is the literature study method. The results of literature studies such as journals, articles, or books in this study are able to support character education in general as well as specifically as in mathematical learning. The application of character education in mathematical learning to develop the character education of learners adapted to learning adapted to the needs of learners in mathematical learning as well as their objectives
PENGARUH PENGGUNAAN MEDIA PEMBELAJARAN APLIKASI CANVA (PRESENTATION) DAN MINAT BELAJAR TERHADAP HASIL BELAJAR SISWA
No full textThis research is motivated by the low learning outcomes of class XI students in business economics subjects for the 2023/2024 academic year. This is due to students' lack of interest in the learning process. This research aims to determine differences in student learning outcomes through the application of the learning media Canva (presentation) in class XI accounting at SMK Negeri 1 Kinali West Pasaman.This type of research is experimental research. The population of this research is students of class XI Accounting at SMK Negeri 1 Kinali for the 2023/2024 academic year. Samples were taken using a saturated sampling technique by determining the control class and the experimental class. The AKL1 class was selected as the experimental class while the AKL2 class was the control class. The instrument used is a test of student learning outcomes. The data analysis technique for testing hypotheses is the Z test.Based on data analysis, the average value for the experimental class was 83.52 and the average for the control class was 77.98. The results of data analysis show that the calculated Z value of 2.366 is greater than the Z table of 1.960, which means that the proposed hypothesis is accepted at the real level a = 0.05. This shows that there is a significant difference between the learning outcomes of students who use learning media and students who do not use learning media. This means that the learning outcomes of students who use the Canva (presentation) learning media are better than the results of studying business economics subjects in class XI Accounting at SMK Negeri 1 Kinali West Pasaman