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All Journal Jurnal Pendidikan Teknologi dan Kejuruan Rekayasa Mesin JOIV : International Journal on Informatics Visualization INVOTEK: Jurnal Inovasi Vokasional dan Teknologi Jurnal Penelitian Pendidikan IPA (JPPIPA) JURNAL PENDIDIKAN TAMBUSAI JETL (Journal Of Education, Teaching and Learning) Jurnal Teknik Mesin Jurnal Teknologi Informasi dan Pendidikan Jurnal Vokasi MOTIVECTION : Journal of Mechanical, Electrical and Industrial Engineering Reswara: Jurnal Pengabdian Kepada Masyarakat Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat SELODANG MAYANG Teknomekanik Multicience International Journal of Multidisciplinary Research and Literature (IJOMRAL) Jurnal Vokasi Mekanika Journal of Social And Economics Research Journal of Community Service Tsaqofah: Jurnal Penelitian Guru Indonesia CONSEN: Indonesian Journal of Community Services and Engagement Jurnal Aplikasi IPTEK Indonesia Al-DYAS : Jurnal Inovasi dan Pengabdian kepada Masyarakat Journal of Engineering Researcher and Lecturer Ranah Research : Journal of Multidisciplinary Research and Development International Journal of Multidisciplinary Research of Higher Education (IJMURHICA) Journal of Innovative and Creativity IJIMCE : International Journal of Innovation in Mechanical Construction and Energy Venus: Jurnal Publikasi Rumpun Ilmu Teknik journal of social and economic research Jurnal Pendidikan MIPA IJIS Edu : Indonesian Journal of Integrated Science Education JRTI (Jurnal Riset Tindakan Indonesia)
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Evaluation of the One Heart Education Program in the Motorcycle Engineering and Business Expertise Competency Nogi Handepi; Wakhinuddin; Hasan Maksum; Arwizet K
Jurnal Penelitian Pendidikan IPA Vol 11 No 1 (2025): January
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i1.9772

Abstract

Vocational education plays a critical role in preparing students to meet industry demands and enter the workforce effectively. This study aims to evaluate the One Heart Education Program in the Motorcycle Engineering and Business expertise competency at SMKN 1 Luak District, focusing on context, input, process, and product aspects, using the CIPP evaluation model. The study examines whether the program has been managed optimally. Employing a mixed-method approach, the research uses purposive sampling, involving 36 respondents, 26 for quantitative data and 10 as qualitative informants. Data collection methods include questionnaires and interviews. The evaluation results show that the program achieved an overall score of 72.24, categorized as sufficient, indicating suboptimal management. In detail, the context aspect related to program objectives is rated as poor, though the environmental aspect is good. The input, process, and product aspects are also found to be lacking. Key recommendations include optimizing the context aspect by refining program goals, adopting a centralized approach in the input aspect to explore students’ potential, enhancing the learning process in the process aspect to better align with industrial standards, and improving outcomes in the product aspect. These improvements aim to enhance the overall effectiveness and impact of the One Heart Education Program.
Development of Jobsheet Based on Collaborative Project Based Learning in Lathe Machining Engineering Subjects Ikhsan Dani Nugraha; Arwizet Karudin; Ambiyar; Refdinal
Jurnal Penelitian Pendidikan IPA Vol 11 No 7 (2025): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i7.11350

Abstract

Effective practical learning in vocational education requires instructional tools that support collaboration and contextual problem-solving. Jobsheets integrated with Collaborative Project-Based Learning (CPjBL) are expected to address this need in Lathe Machining subjects. This study employed a modified 4D development model (Define, Design, Develop, Disseminate) to create a CPjBL-based jobsheet. The research involved 11th-grade Machining Engineering students at SMK Negeri 5 Padang, selected via purposive sampling. Data collection instruments included expert validation sheets, student questionnaires, observation checklists, and pretest-posttest assessments. The jobsheet featured collaborative tasks such as producing lathed components, with defined roles and peer coordination. Validation scores indicated strong content and design quality: material experts (92%), media experts (87%), and teachers (95%). Practicality was rated highly by both teachers (92.33%) and students (84.67%). The effectiveness test showed a significant learning gain with an N-Gain score of 0.65 (high category). Observations revealed active student collaboration through defined group roles, communication, and joint accountability. The CPjBL-based jobsheet effectively enhanced student engagement and machining competencies. Its integration into vocational learning aligns educational practices with industrial expectations and supports the development of collaborative, work-ready graduates.
Factors Contributing to the Success of Industrial Work Practice (PKL) Using PLS in a Vocational Mechanical Engineering Program Jimmi Zamora; Arwizet K; Waskito; Giatman
Jurnal Penelitian Pendidikan IPA Vol 11 No 11 (2025): November
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i11.12435

Abstract

This study examines the factors that influence the success of Industrial Work Practice (PKL) implementation in the Mechanical Engineering Program at SMK Negeri 1 Sumatera Barat. Using a quantitative research design with Partial Least Squares (PLS), data were collected from 58 students who participated in the 2023 internship program. The research investigates the contribution of five variables: productive subjects, general subjects, curriculum alignment, school mentoring, and industrial mentoring. The findings show that productive subjects have the strongest influence on PKL success, followed by school mentoring and industrial mentoring. In contrast, general subjects and curriculum alignment do not demonstrate a significant effect. These results highlight the crucial role of technical competence and consistent guidance in ensuring effective internship experiences. The study emphasizes the need for stronger collaboration between schools and industry to enhance the relevance of vocational learning. It also suggests aligning instructional practices with workplace expectations to better prepare students for real industrial environments. Overall, this research provides empirical evidence that reinforces the importance of practical skills and structured mentoring in improving internship outcomes within vocational education.
Calculation of High Pressure Heater Efficiency in the Feedwater System of PT PLN IP Teluk Sirih Unit 2 Steam Power Plant Andre Kurniawan; Arwizet K; Yolli Fernanda; Zulvani Adha
Jurnal Vokasi Mekanika (VoMek) Vol 8 No 1 (2026): Jurnal Vokasi Mekanika
Publisher : Unversitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/v1frxb70

Abstract

PT PLN IP Teluk Sirih is a coal-fired steam power plant that supplies electricity to the West Sumatra region. In steam power plants, the High Pressure Heater (HPH) functions as a heat exchanger that preheats feedwater before entering the boiler by utilizing extraction steam from  turbine. Damage or performance degradation of the HPH can reduce its effectiveness and lifespan, decrease feedwater temperature, increase the required heating in  boiler, raise fuel consumption, and ultimately lower the overall efficiency of the power plant cycle. Therefore, this study aims to determine the efficiency of HPH at PT PLN IP Teluk Sirih Unit 2 in order to support proper maintenance planning and reduce operational costs. The research employs a quantitative method with a descriptive–analytical approach using actual operational data obtained from the Distributed Control System (DCS) of PLTU Teluk Sirih Unit 2. The efficiency of HPH is calculated by comparing the heat released by the steam  and the heat absorbed by the feedwater  or HPH 1 and HPH 2. The variables used include the feedwater inlet temperatures of 192.9 °C for HPH 1 and 141.5 °C for HPH 2. The results show that the efficiency of HPH 1 is 91.26%, while the efficiency of HPH 2 is 88.11%. For HPH 1,  and  are 49,552,500 kJ/h and 54,297,300 kJ/h, respectively, whereas for HPH 2,  and  are 71,613,300 kJ/h and 81,288,480 kJ/h. These results indicate that a higher inlet temperature leads to a greater ratio between  and  , and consequently to a higher HPH efficiency.  
Evaluasi pelaksanaan praktik kerja industri kompetensi keahlian teknik kapal penangkap ikan di SMK dengan bantuan software atlas.ti Putri Nurhalimah Erdi; Arwizet K; Ambiyar Ambiyar; Waskito Waskito
JRTI (Jurnal Riset Tindakan Indonesia) Vol. 7 No. 4 (2022): JRTI (Jurnal Riset Tindakan Indonesia)
Publisher : IICET (Indonesian Institute for Counseling, Education and Therapy)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29210/30032171000

Abstract

Penelitian ini bertujuan untuk melihat sejauh mana program tersebut telah berhasil mencapai maksud pelaksanaan program yang telah ditetapkan sebelumnya. Evaluasi pelaksanaan praktik kerja industri pada kompetensi keahlian Teknika Kapal Penangkap Ikan di SMK Negeri 3 Kota Pariaman tersebut dilihat dari aspek antecedents, transaction dan outcomes. Metode penelitian yang digunakan yaitu metode penelitian mixed methods (kombinasi) dimana penelitian ini menggabungkan penelitian Kuantitatif dengan penelitian Kualitatif. Hasil penelitian menunjukan bahwa praktik kerja industri di SMK Negeri 3 Kota Pariaman jika ditinjau dari segi komponen antecedents indikator kesiapan peserta didik dalam menghadapi prakerin termasuk kategori sangat baik, kinerja guru mata pelajaran produktif termasuk dalam kategori baik, dan kesiapan sarana dan prasarana termasuk dalam kategori baik. Komponen transaction, indikator kinerja peserta didik selama pelaksanaan prakerin termasuk dalam kategori sangat baik, dan kinerja pembimbing prakerin dalam pelaksanaan prakerin termasuk dalam kategori sangat baik. Komponen outcomes indikator kesiapan kerja peserta didik setelah pelaksanaan prakerin termasuk dalam kategori sangat baik. Serta penggunaan aplikasi software Atlas.ti sangat membantu peneliti dalam mengolah hasil wawancara, dikarenakan tool yang disuguhkan lewat software memudahkan dalam melihat dan meninjau kembali hasil wawancara yang sudah dilakukan oleh interviewer.
Pengembangan Labsheet Praktikum Uji Tekuk (Buckling) pada Mata Kuliah Fenomena Dasar Mesin Prodi S1 Pendidikan Teknik Mesin FT UNP Putra, Romi; Sari, Delima Yanti; K, Arwizet; Wulansari, Rizky Ema
TSAQOFAH Vol 5 No 4 (2025): JULI
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v5i4.6683

Abstract

The buckling test labsheet used in the Fundamental Mechanical Phenomena course within the Undergraduate Program in Mechanical Engineering Education at the Faculty of Engineering, Universitas Negeri Padang (UNP), has been identified as having limitations in its instructional content. This study aims to develop and refine the labsheet to ensure adequate material coverage and a high level of feasibility for use in practical learning activities. The research employed a Research and Development (R&D) method using the Plomp development model, with a quantitative research design. Validation was conducted by three validators: the course instructor, a subject matter expert, and a media expert from the Department of Mechanical Engineering, FT UNP. Data were collected through a Likert-scale validation questionnaire and analyzed using quantitative descriptive techniques. Results from the material aspect showed that the subject matter expert gave an average score of 3.07 (76.75%), categorized as “Feasible,” while the course instructor provided a score of 3.23 (80.75%), categorized as “Highly Feasible.” For the media aspect, the media expert gave an average score of 3.59 (89.75%), and the course instructor provided a score of 3.43 (85.75%), both falling into the “Highly Feasible” category. Based on these findings, it can be concluded that the developed practical labsheet is categorized as “Highly Feasible” for use in practical sessions of the Fundamental Mechanical Phenomena course and holds potential as a reference for further research in the field of technical instructional material development.
Karakteristik Turbin Archimedes pada Ketinggian Air Rendah dan Kemiringan 45° Ikhsan, Ghufra; Fernanda, Yolli; Karudin, Arwizet; Primawati, Primawati
TSAQOFAH Vol 5 No 6 (2025): NOVEMBER
Publisher : Lembaga Yasin AlSys

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.58578/tsaqofah.v5i6.7263

Abstract

Turbines are a key component in hydroelectric power generation, including the Archimedes Screw type, which is specifically designed to operate under low head and low water discharge conditions. This study aims to calculate the rotational speed of the Archimedes Screw turbine under varying water discharge rates, analyze the effect of discharge on turbine rotation, and compute and evaluate the turbine’s efficiency. A quantitative experimental approach was employed, with data obtained through direct testing of a designed Archimedes Screw turbine prototype. Research instruments included measurements of turbine rotational speed and the generated electrical power. Tests were conducted three times at a 45° inclination angle. The results showed that the actual power (Pactual) generated was 11.95 Watts in the first trial, 10.96 Watts in the second, and 12.56 Watts in the third. These findings indicate variations in power output influenced by water discharge and demonstrate the potential of the Archimedes Screw turbine as a micro-hydro energy solution for low-flow water sources. The study concludes that optimizing design and operational parameters is essential for improving the efficiency of such power generation systems.
Pemanfaatan Trainer Kit Cold Storage Portable sebagai Media Pembelajaran untuk Meningkatkan Kompetensi Siswa di SMK N 3 Pariaman Karudin, Arwizet; Usmeldi, Usmeldi; Leni, Desmarita
Suluah Bendang: Jurnal Ilmiah Pengabdian Kepada Masyarakat Vol 26, No 1 (2026): Suluah Bendang: Jurnal Ilmiah Pengabdian kepada Masyarakat
Publisher : Universitas Negeri Padang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/sb.07100

Abstract

Keterbatasan media pembelajaran praktik pada mata pelajaran teknik pendingin menjadi salah satu kendala dalam meningkatkan kompetensi siswa di SMK N 3 Pariaman, khususnya pada Program Keahlian Teknika Kapal Penangkap Ikan (TKPI) dan Teknik Pendingin Tata Udara (TPTU). Proses pembelajaran yang masih didominasi metode teoritis menyebabkan siswa mengalami kesulitan dalam memahami sistem cold storage dan penerapan teknologi energi terbarukan dalam bidang pendinginan. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan pemahaman dan keterampilan siswa melalui pemanfaatan trainer kit cold storage portable berbasis solar cell dan thermoelectric sebagai media pembelajaran praktik. Metode pelaksanaan kegiatan dilakukan melalui observasi, identifikasi masalah, perancangan trainer kit, pelatihan, demonstrasi penggunaan alat, serta pendampingan kepada guru dan siswa. Evaluasi kegiatan dilakukan menggunakan observasi dan penyebaran kuesioner kepada peserta pelatihan. Hasil kegiatan menunjukkan bahwa trainer kit yang dikembangkan mampu meningkatkan keterlibatan dan pemahaman siswa dalam pembelajaran teknik pendingin. Hasil evaluasi menunjukkan mayoritas peserta memberikan respon sangat positif dengan persentase kepuasan sebesar 73% pada kategori sangat setuju. Kegiatan ini menghasilkan media pembelajaran inovatif yang mendukung pembelajaran praktik berbasis energi terbarukan di sekolah vokasi.
Developing Android App-Based Interactive Learning Media for Mechanical Engineering Basics: Enhancing Vocational School Student Learning Outcomes Arief Juneirul Pratama; Arwizet K; Hasan Maksum; Rizky Ema Wulansari
Jurnal Penelitian Pendidikan IPA Vol 10 No 7 (2024): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v10i7.7567

Abstract

This study is to provide valid, practical, and effective Android application-based interactive learning media for the Basics of Mechanical Engineering subject in class X Mechanical Engineering at SMK Dhuafa Padang. This medium is intended to boost students' comprehension, motivation, and independence, allowing them to achieve better learning outcomes. The research approach employed is Research and Development (R&D), using a 4D development model (define, design, develop and disseminate). The primary data utilized in this study came from validators, teachers, and students. Data was analyzed descriptively to characterize the validity, practicality and effectiveness of the learning media developed. The validity test findings show that this learning medium, which had a media aspect score of 0,892 and a material aspect score of 0,950, was deemed valid by expert review. This media was also declared practical with a practicality score of 96,94% from teacher responses and 92,25% from student responses. In the effectiveness test, the Gain Score was 0,68, placing it in the medium category. Meanwhile, the t-test shows a Sig value (2-tailed) of 0.002 (2-tailed < 0,05) and a tcount value of 3,372 (tcount ˃ ttable), indicating a significant difference in learning outcomes between students who use this learning media (experimental class) and those who do not use the media (control class). Thus, this Android application-based interactive learning media is declared valid, practical and effective for use in the DDTM learning process.
Development of a Job Sheet for Mechanical Measuring Instruments Using Virtual Learning and Project-Based Learning in the Motorcycle Engineering Department at SMK Negeri 2 Palembang Adel Lia Mardiana; Arwizet K; Refdinal Refdinal; Jonni Mardizal; Abdul Habib Arrasyidi Desky
Jurnal Penelitian Pendidikan IPA Vol 12 No 5 (2026): In Progress
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v12i5.15136

Abstract

This study aims to develop a mechanical measurement practical worksheet integrated with Project-Based Learning (PjBL) and delivered through a Learning Management System (Google Classroom), as well as to examine its validity, practicality, and effectiveness. The study employed the ADDIE development model, consisting of analysis, design, development, implementation, and evaluation stages, with PjBL principles embedded in the product design and learning activities. The participants were 35 tenth-grade vocational students (N=35). The results showed that the developed worksheet achieved a very high level of validity based on expert evaluations of media, content, and language, with an average score of 94.6%. In terms of practicality, teacher and student responses reached 92.72% and 93.18%, respectively, both categorized as “very good,” indicating that the worksheet is easy to use and supports flexible practical learning. Regarding effectiveness, students’ learning outcomes improved significantly, with mean scores increasing from 30.92 (pretest) to 86.00 (posttest) and an N-gain of 0.80 (high category). Hypothesis testing confirmed a significant difference (p < 0.05) before and after implementation. In conclusion, the PjBL-integrated mechanical measurement practical worksheet distributed through Google Classroom as an LMS is valid, practical, and effective in improving students’ learning outcomes.
Co-Authors - Primawati -, Nasrullah - A, Esa Hafizul A, Yufrizal Abadi, Zainal Abadi Abbas, Muhammad Rabiu Abd. Aziz Abd. Aziz Abdillah Irfan Abdul Aziz Abdul Habib Arrasyidi Desky Abdul Habib Arrasyidi Desky Ade Habibbullah Adel Lia Mardiana Adriansyah Adriansyah Aggrivina Dwiharzandis Agia Kulkarni Preti Agusriza Almalik Agustian, Rizki Ahmad Arif Ahmad Natafian Fauzi Ahmad Rifai Sihombing Ahmad, Salamuddin Ahmed, Shabir Akbar, Yaumil Akhmad Rais Aldi Alfarizi Alfarizi, Aldi Alvien Khardin Ambiyar, Ambiyar Amir, Irfan Ananda, Opi Andika Putra ANDIKA SAPUTRA Andre Kurniawan Andre Kurniawan Andre Kurniawan Anjelika, Dea Qori Anuar, Bakri Anugrah, Pinto Aprianti, Maidinda Aqilvin Berliansyah Arafat, Andri Arafat, Andril Arham, Veri Budiawan Arief Juneirul Pratama Ariyanto, Dedi Aryasandy, Nensy Asep Bunyamin Azmil Azman Bayu Rianto Berry Delfi Andra Budi Syahri Bulkia Rahim Bunyamin, Asep Butar, David Beckham Butar Carlen Muhammad Hendra Chrismondari, Chrismondari Daniel Fifaldi Nardo Darmawi . Delima Yanti Sari Denisa Putri Jadenis Desmarita Leni Deviya Aprilman Dionova, Aldi Dodi Ariska Doni Saputra Dori Yuvenda Efendi, Defindo Efriwan Efriwan Eko Indrawan Elfizon Endri Rizki Anugrah Erdi, Putri Nurhalimah Erizon, Nelvi Erlanda, Rendi Fachrur Rozi Fachry Novrianda Fahrendra, Aqsal Faisal, Afdal Fajri Ramadhan Fakhrur Rozi, Fakhrur Febri Prasetya Felia Maresta Fiqi Gusti Irawan Firman Omni Saputra Fitrah Qalbina Fretina Sari Giatman Giatman, M Gito Okto Rito FM Gusta Nanda Habibbullah, Ade Hadi, Farhan Hafiz Alfadri Ramadhan Haris Haris Haris Haris, Haris Hasan Maksum Hasanuddin Hasanuddin Hasanuddin WS Helga Yermadona Hendra Hendra Hendri Nurdin Idra Putra Ikhsan Dani Nugraha Ikhsan, Ghufra Irfan Amir Irma Yulia Basri Irzal Irzal Jalil, Muhammad Jasman Jasman Jasman Jasman Jasman Jimmi Zamora Jonni Mardizal Junil Adri Kandena Putra, Tegar Khairuni Delfi Anisa Kresna Adi Prasetya Krismadinata Krismadinata Krismadinata Krismadinata Krismadinata Krismadinata, Krismadinata kusuma, Yuda Perdana M. Agus Trian Putra M.Y. Setiawan Martias Martias Mega Risna Miftahul Arrafi Monica, Okzalia Muchlisinalahuddi Muchlisinalahuddi Muhammad Akhbar Muhammad Anwar Muhammad Aulia Ifsan Muhammad Lathif Mahendra Muhammad, Maghfiridhani Muharir Muharir Muharni, Riza Mulianti Mulyanti Muslim Muslim Nabawi, Rahmat Azis Nadia Utari Nasution, Ridhollah Nelvi Erizon Nidya Meliza Putri Nizwardi Jalinus Nofri Helmi Nofri Helmi Helmi Nogi Handepi Nurdin Hendri Nurfajri Nurfajri Nurfajri Nurfajri, Nurfajri Nuzul Hidayat, Nuzul Okky Syaifatul, Achmad Oky Erlangga Oky Erlangga Okzama, Rebi OSKAH DAKHI Ovi Marendah Pasaribu, Reynaldy Peng, Lim Hooi Prasetyo, Vicky Primawati Primawati Primawati Primawati, Primawati Purnama, Andreadi Purwantono Purwantono Purwantono purwantono purwantono Purwantono, Purwantono Putra, Idra Putra, Rido Putra, Romi Putri Nurhalimah Erdi Putri, Prima Yane Rahmad Robby Alzam Rahmat Afdhol Rahmat Syukri Ramfit Novari Randhy Alfarishi Rebi Okzama Refdinal Refdinal Refdinal Refdinal Refdinal, Refdinal Refdinal, Refdinal Remon Lapisa Remon Lapisa Remon Lapisa Remon Lapisa Rifelino Rifelino Rio Ramadhan Rivanol Chadry Rizka Rizka Rizka Rizka, Rizka Rizki Ramadhan Nasution, Muhammad Rizky Ema Wulansari Rizky Ema Wulansari Robby, Muhammad Robert, Julio Rozandi, Azel Ruzita Sumiati Said Fuad Amry Salamuddin Ahmad Seprianto, Ekon Setiawan, Sepdirama Sharma, Jai Kumar Simon, Ryan Ananda Siswahyudianto Soretire Lanrewaju Kamorudeen Sri Rizki Putri Primandari Steven Thomas Anggriyanto Sukardi Sukardi Sukardi, Sukardi Supardi Supardi Suparno Suparno Suparno Suparno Suparno Syah, Muhammad Rayhan Syukri, Rahmat Toto Sugiarto Totoh Andayono Usin Usin Usmeldi Usmeldi Wahyu Ananda Putra Wahyudi Fachrul Syafra Wakhinuddin WAKHINUDDIN SIMATUPANG Wanda Afnison Waskito Waskito Waskito Waskito Waskito, Waskito Winaldi Alfonis Wulansari, Rizky Ema Yandra, Muvi Yanriko, Armizal Yanto, Doni Tri Putra Yazmendra Rosa Yoga Novrialdy Yolli Fernanda Yovindra, Difa Yufrizal A Yufrizal Yufrizal Yufrizal Yufrizal Yulira Emputri Yurika Putri Zainal Abadi Zainal Abdi Zulvani Adha