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All Journal Acta Interna : The Journal of Internal Medicine Justitia Kodifikasia: Jurnal Penelitian Islam Media Mesin: Majalah Teknik Mesin IJFAC (Indonesian Journal of Fundamental and Applied Chemistry) JURNAL CRANKSHAFT Pedagogia: Jurnal Ilmiah Pendidikan Dasar Indonesia Journal of Economics and Business Letters Jurnal Kesejahteraan Sosial, Komunikasi dan Administrasi Publik Fahmina Jurnal Pendidikan Islam Jurnal Dunia Peternakan Jurnal Ilmiah Ekonomi, Manajemen dan Bisnis (EKMABIS)
Subroto Subroto
Dosen Jurusan Syari’ah dan Ekonomi Islam STAIN Ponorogo
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STUDI EKSPERIMENTAL EFEK VARIASI DIAMETER DALAM RING MANIFOLD TERHADAP KARAKTERISTIK PERFORMA MESIN SEPEDA MOTOR 110 CC Putro, Sartono; Faishal, Afif; Subroto, Subroto; Putri, Arinda Soraya; Laksono, Singgih Ponco; Supriyanto, Bambang
JURNAL CRANKSHAFT Vol 8, No 3 (2025): Jurnal Crankshaft Vol. 8 No. 3 (2025)
Publisher : Universitas Muria Kudus

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24176/cra.v8i3.15375

Abstract

Motor bakar internal masih menjadi sistem propulsi utama kendaraan bermotor, didukung oleh infrastruktur yang memadai, ketersediaan bahan bakar, serta kinerja operasional yang andal. Upaya peningkatan performa mesin terus dilakukan, salah satunya melalui rekayasa sistem gas buang. Penelitian ini mengkaji pengaruh variasi diameter dalam Velocity Stack Ring terhadap performa mesin sepeda motor 110 cc. Velocity Stack Ring merupakan perangkat berbentuk cincin yang dirancang untuk meningkatkan proses pembakaran dengan mempercepat aliran udara masuk ke dalam manifold buang, sehingga mampu mengurangi turbulensi aliran. Modifikasi dilakukan pada exhaust manifold dengan tiga variasi diameter internal: 15 mm, 20 mm, dan 25 mm. Evaluasi kinerja meliputi torsi, daya, dan konsumsi bahan bakar spesifik, melalui pengujian eksperimental menggunakan alat uji Dynotest. Hasil penelitian menunjukkan bahwa variasi diameter Velocity Stack Ring memberikan pengaruh signifikan terhadap performa mesin. Torsi tertinggi diperoleh pada variasi 15 mm sebesar 6,93 Nm pada 5618 rpm, meningkat dari kondisi standar sebesar 6,23 Nm pada 5750 rpm. Daya maksimum dicapai pada diameter 20 mm sebesar 6,4 hp pada 7206 rpm, lebih tinggi dibandingkan daya standar sebesar 5,6 hp pada 6982 rpm. Sementara itu, nilai konsumsi bahan bakar spesifik (SFC) terendah tetap diperoleh pada kondisi standar, yaitu 0,127 kg/hp.jam, dibandingkan dengan nilai 0,143 kg/hp.jam pada penggunaan diameter 20 mm. Dengan demikian, modifikasi Velocity Stack Ring terbukti mampu meningkatkan performa mesin, terutama dalam hal daya dan torsi, meskipun disertai peningkatan konsumsi bahan bakar.
Religious Moderation In Akidah Akhlak Teaching Materials At The Madrasah Aliyah Usman, Usman; Subroto, Subroto; Al-Husna, Khofifah Indah; Aman, Aman; Siregar, Mulatua
Fahmina: Jurnal Pendidikan Islam Vol 1, No 1 (2023)
Publisher : UIN SYEKH ALI HASAN AHMAD ADDARY PADANGSIDIMPUAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24952/fahmina.v1i1.10086

Abstract

Religious moderation is a topic of discussion that is widely discussed today considering the emergency cases of intolerance and radicalism in public life, especially in the world of education. Textbooks are certainly considered important as a form of character and personality formation that must support anti-radicalism and tolerance. Therefore, in writing this article, we will discuss the description of the moral creed textbook class X curriculum 2013 and describe the content of religious moderation values in the moral creed textbook class X curriculum 2013. This research is classified as library research with a qualitative approach. Data collection methods are used through documentation methods, and data is analyzed through Content analysis (content analysis). That is by linking religious moderation indicators to class X Akidah Akhlak textbooks at the Madrasah Aliyah level published by the Ministry of Religious Affairs. The result of this research is that there are several parts in each chapter of discussion, including: pearls of wisdom, perception, deepening of the material, student activities, attitude scales, summaries, final chapter assessments, case studies and exemplary stories. The content of religious moderation values contained in the Bina Akidah Akhlak KMA 2019 textbook for Madrasah Aliyah Class X is in accordance with the four basic values of religious moderation that must be instilled in the world of education, namely Tasamuh, 'Adalah, Tawazun and equality.
Peningkatan Aktivitas dan Hasil Belajar Pendidikan Jasmani dan Kesehatan melalui Metode Course Reivew Horay pada Siswa kelas VI SD Negeri 2 Natar Lampung Selatan Tahun Pelajaran 2019/2020 Subroto, Subroto
Pedagogia: Jurnal Ilmiah Pendidikan Dasar Indonesia Vol. 4 No. 1 (2022): Pedagogia
Publisher : Program Studi PGSD, Jurusan Ilmu Pendidikan, STKIP PGRI Bandar Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52217/pedagogia.v4i1.778

Abstract

The purpose of this study is to increase activities and learning outcomes of Physical Education through the course review method for Class VI students of SD Negeri 2 Natar, Natar District, South Lampung, for the 2019/2020 academic year. CAR research method in 3 learning cycles, each consisting of planning, action, observation, reflection. This research was conducted at SD Negeri 2 Natar, South Lampung, in the odd semester of the 2019/2020 academic year. The research data was taken from observing the activities and learning outcomes of students and colleagues. Cycle I learning outcomes 61%, learning activities 62%, cycle II learning outcomes increased to 73% and Activities 81%, cycle III learning outcomes increased to 82%, learning activities 85%. Conclusion The use of the Course Review Horay (CRH) model can improve activities and learning outcomes of Physical Education in Class VI students of SD Negeri 2 Natar South Lampung 2019/2020.
Culture, leadership, and performance management as drivers of employee work ethic: Evidence from Indonesia Eximbank (LPEI) Jakarta Subroto, Subroto
Journal of Economics and Business Letters Vol. 4 No. 3 (2024): June 2024
Publisher : Privietlab

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55942/jebl.v4i3.986

Abstract

This study investigates whether organizational culture, leadership, and performance management jointly shape employee work ethic in a policy-bank context. Drawing on Lembaga Pembiayaan Ekspor Indonesia’s (LPEI) TRUST cultural code and its competency-based HR architecture, we conducted a cross-sectional survey of Jakarta-based staff and structural-position employees using five-point Likert measures aligned to validated constructs (Competing Values Framework for culture, transformational/contingent-reward behaviors for leadership, continuous-system indicators for performance management, and MWEP facets for work ethic). Instrument screening indicated acceptable validity and reliability (α≈0.81 culture; 0.90 leadership; 0.70 performance management; 0.79 work ethic), consistent with recommended thresholds for organizational measures. Descriptively, respondents reported strong culture, leader behaviors, performance routines, and work-ethic profiles—especially on integrity, time discipline, and diligence—consistent with the theory that values and competencies have been institutionalized in daily operations. Bivariate associations between the three predictors and work ethic were positive but small and not statistically significant at α=0.05, a pattern plausibly explained by restricted variance from high institutional baselines, some indicator attenuation, and single-time-point design. Substantively, the direction of effects supports the theoretical model linking culture, leadership, and continuous performance management to work-ethic behaviors in export-finance settings. We outline actionable refinements—greater role-appropriate delegation, behaviorally anchored PM indicators tied to CBHRM proficiency levels, and unit-level problem-solving forums—and recommend future multi-unit or longitudinal designs (and/or latent-variable models) to recover true effects that current ceiling levels may mask.
Analysis of the Success Rate of Artificial Insemination Programs in Bali Cattle in Tanjung Harapan Village, South Lampung Regency: Analysis of the Success Rate of Artificial Insemination Programs in Bali Cattle in Tanjung Harapan Village, South Lampung Regency Subroto, Subroto; Herdiansah, Riko; Suhadi, Miki; Asek, Ambo
JDP: Jurnal Dunia Peternakan Vol. 4 No. 1 (2026): Jurnal Dunia Peternakan
Publisher : Fakultas Peternakan Universitas Tulang Bawang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37090/sz9bby61

Abstract

Penelitian ini bertujuan untuk mengevaluasi tingkat keberhasilan inseminasi buatan (IB) pada sapi menggunakan pendekatan Service per Conception (S/C) dan Conception Rate (CR). Data dikumpulkan dari 40 responden petani dengan total 130 ekor sapi yang menjalani inseminasi buatan. Hasil menunjukkan bahwa 174 ekor sapi dipastikan bunting, dengan nilai S/C sebesar 1,34 dan CR sebesar 61,53%. Nilai S/C di bawah 2 menunjukkan bahwa implementasi IB relatif efisien, sedangkan nilai CR mendekati 70% mencerminkan tingkat keberhasilan kehamilan yang cukup tinggi. Temuan ini menunjukkan bahwa implementasi IB telah dilakukan dengan manajemen yang relatif baik, khususnya dalam hal deteksi estrus, keterampilan inseminator, dan kondisi kesehatan reproduksi sapi. Meskipun demikian, peningkatan lebih lanjut dalam pendidikan petani terkait manajemen reproduksi dan penanganan pasca-IB masih diperlukan untuk mengoptimalkan kinerja reproduksi secara berkelanjutan. Penelitian ini memberikan wawasan praktis tentang efektivitas program IB dan dapat berfungsi sebagai referensi untuk perencanaan kebijakan yang bertujuan meningkatkan produktivitas ternak di tingkat pertanian skala kecil.
Educational Management of Hypnoteaching-Based Learning Model Development in Islamic Higher Education Subroto, Subroto; Zulhammi, Zulhammi; Siregar, Lis Yulianti Safrida
Jurnal Ilmiah Ekonomi Manajemen & Bisnis Vol. 4 No. 1 (2026): February 2026
Publisher : LPPM Sekolah Tinggi Ilmu Ekonomi Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.60023/28yp6r90

Abstract

This study addresses the persistent issue of monotonous instructional practices in Islamic Religious Education (PAI) in higher education, which tend to emphasize surface-level cognitive achievement without effectively engaging students’ subconscious dimensions. From an educational management perspective, this condition reflects limitations in instructional planning, lecturer readiness, and the systematic implementation of innovative learning models. The objective of this research is twofold: (1) to analyze existing learning conditions in the PAI Study Program, and (2) to develop a hypnoteaching-based learning model that is valid, effective, and practical within a structured management framework. This study adopts a Research and Development (R&D) approach using the ADDIE model, which integrates key managerial functions, including planning (analysis and design of the model), organizing (lecturer preparedness and instructional system support), implementation (integration of the model into classroom practice), and evaluation (validation and effectiveness testing as part of quality control). The findings indicate that the developed model achieved a high level of validity, with expert validation reaching 93%, categorized as “very valid.” In the implementation stage, the model proved to be more effective than conventional lecture-based methods, significantly enhancing students’ learning interest, engagement, and active participation. Moreover, the model contributes to a more conducive and psychologically supportive learning environment. From a management standpoint, the hypnoteaching approach supports lecturers in applying structured, persuasive communication strategies while strengthening institutional efforts in improving instructional quality and governance. It also facilitates the internalization of Islamic values through a more holistic and student-centered learning process. In conclusion, this study offers a strategic contribution to educational management by providing a systematic and applicable framework for planning, implementing, and evaluating innovative learning models in higher education
Co-Authors Afif Faishal Al-Husna, Khofifah Indah Aman Aman Arinda Soraya Putri Aris Tri Handoko, Aris Tri Asek, Ambo Bambang Supriyanto Binyamin Binyamin Binyamin Binyamin, Binyamin Dwi Prastiyo, Dwi Eddy Ibrahim Eko Budiono Fajar Tri Yunianto, Fajar Tri Hartanto, Aris Laksono, Singgih Ponco Marwan Effendy MKR, Andrew MUHAMMAD SAID Nurmuntaha Agung Nugraha Poedji Loekitowati Hariani Pusaka, Semerdanta Rachman, Abidin Riko Herdiansah Saputro, Nurhadi Sarjito - Sartono Putro Shodiqin Shodiqin, Shodiqin Siregar, Lis Yulianti Safrida Siregar, Mulatua Suhadi, Miki Sumardi . Sunardi Wiyono Tri Tjahjono Triyanto, Joko Usman Usman Zulhammi, Zulhammi