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All Journal Jurnal Penelitian Saintek JIPTEK : Jurnal Ilmiah Pendidikan Teknik dan Kejuruan Jurnal Teknik ITS Jurnal Bahan Alam Terbarukan Jurnal Pendidikan Teknik Mesin Lembaran Ilmu Kependidikan Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran Sainteknol : Jurnal Sains dan Teknologi Automotive Science and Education Journal Journal of Mechanical Engineering Learning REiD (Research and Evaluation in Education) Jurnal Pengabdian Magister Pendidikan IPA Jurnal Teknik Mesin Indonesia Community Development Journal: Jurnal Pengabdian Masyarakat Jurnal Inovasi Pembelajaran Karakter Journal of Vocational and Career Education Jurnal Pendidikan Vokasi Otomotif Dedikasi: Jurnal Pengabdian kepada Masyarakat JURNAL REKAYASA KIMIA & LINGKUNGAN Jurnal MEKOM: Media Komunikasi Pendidikan Kejuruan Jurnal Penelitian Pendidikan Journal of Vocational and Career Education Jurnal Pendidikan Teknik Mesin
Dwi Widjanarko
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Aerospace Engineering Humanities Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Energy Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Public Health Social Sciences Transportation Other

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Alteration of Biodiesel Properties and Automotive Diesel Engine Performance due to Temperature Variation of the Transesterification Process Dwi Widjanarko; Ratna Dewi Kusumaningtyas; Ahmad Afwan Fathoni
Jurnal Rekayasa Kimia & Lingkungan Vol 15, No 2 (2020): Jurnal Rekayasa Kimia & Lingkungan (December, 2020)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v15i2.16007

Abstract

This study aimed to examine the effects of transesterification reaction temperature on the biodiesel properties and diesel engine performance. Biodiesel properties evaluated in this work included viscosity, density, and methyl ester content. Meanwhile, the diesel engine performance testing comprised the examination of the engines torque and power. The research was conducted in several stages, viz. producing biodiesel from fresh cooking oil with variations in transesterification temperature of 45, 55, and 65; testing the characteristics of biodiesel produced; blending biodiesel with petroleum diesel to result in B30 biodiesel fuel; and testing biodiesel fuel (B30) in diesel-engined vehicles. It was revealed that the higher transesterification temperature led to the lower biodiesel viscosity, the decreasing value of biodiesel density values, and the higher methyl ester content. Furthermore, it was also demonstrated that increase of the transesterification temperature resulted in the higher value of torque and power generated. However, compared to the petroleum diesel fuel (B0), biodiesel fuel (B30) exhibited the lower values of the engines torque and power. The highest average values of torque and power of B30 fueled diesel-engine were 108.11 Nm and 43.51 kW, respectively, provided by the biodiesel produced at the transesterification reaction temperature of 65.of 65.
Use of TiO2 Powder and Activated Carbon as Catalytic Ceramic Filling Material to Reduce Hazardous Pollutants on Gasoline Engine Dwi Rahmad Setiyono; Dwi Widjanarko
Jurnal Rekayasa Kimia & Lingkungan Vol 13, No 2 (2018): Jurnal Rekayasa Kimia & Lingkungan (December, 2018)
Publisher : Chemical Engineering Department, Syiah Kuala University, Banda Aceh, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23955/rkl.v13i2.11901

Abstract

The purpose of this study was, 1) to examine the effect of the mixture composition between ceramics, TiO2, and activated carbon on catalytic converters on vehicle exhaust emissions, 2) test the composition of the mixture between ceramic, TiO2, and activated carbon in catalytic converters that produce the most exhaust emissions low. This study uses an experimental method with descriptive statistics. The independent variable is catalytic converter with a variety of ceramic material composition with a mixture of TiO2 and activated carbon. Control variables are the composition of the mixture, catalytic converter porosity control, standard exhaust without catalytic converter, engine speed used at stationary speed, and duration of testing time. Dependent variables are vehicle exhaust emissions CO and HC. The results of this study are, 1) The use of ceramic materials mixed with TiO2 and activated carbon in catalytic converters can reduce CO and HC content in gasoline-powered vehicles. 2) The best reduction is in the composition of 50% ceramic material, 25% TiO2, and 25% activated carbon, which is able to reduce CO content from 4.19% to 1.44% and HC gas. Suggestions from this study are, gasoline-powered vehicles can use catalytic converters made from Ceramic with a mixture of TiO2, and activated carbon with a composition of 50% ceramic material, 25% TiO2, and 25% activated carbon.
EFEKTIVITAS PENGGUNAAN MULTIMEDIA SISTEM PENGISIAN ELEKTRONIK DALAM PEMBELAJARAN KELISTRIKAN OTOMOTIF BAGI CALON GURU SEKOLAH MENENGAH KEJURUAN : EFEKTIVITAS PENGGUNAAN MULTIMEDIA SISTEM PENGISIAN ELEKTRONIK DALAM PEMBELAJARAN KELISTRIKAN OTOMOTIF BAGI CALON GURU SEKOLAH MENENGAH KEJURUAN Dwi Widjanarko; Abdurrahman; Supraptono
Jurnal MEKOM : Media Komunikasi Pendidikan Kejuruan Volume 2, Issue 1, Februari 2015
Publisher : Fakultas Teknik, Universitas Negeri Makassar

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Abstract

Penelitian ini bertujuan untuk meneliti keefektifan penggunaan multimedia sistem pengisian elektronik dalam pembelajaran bagi calon guru Sekolah Menengah Kejuruan (SMK). Penelitian ini adalah penelitian kuasi eksperimen dengan model single group pretest-posttest design. Populasi dalam penelitian ini adalah seluruh mahasiswa Program Studi Pendidikan Teknik Otomotif, dan sebagai sampel adalah mahasiswa yang mengambil mata kuliah Teori Kelistrikan Otomotif pada semester ganjil 2014-2015sebanyak 40 mahasiswa. Hasil penelitian menunjukkan bahwa hasil belajar setelah menggunakan multimedia sistem pengisian elektronik lebih baik dan berbeda signifikan dibandingkan sebelum menggunakan multimedia sistem pengisian elektronik. Kenaikan mencapai 29,35 poin atau mencapai 70%, sehingga penggunaan multimedia sistem pengisian elektronik adalah efektif.
PENGEMBANGAN MULTIMEDIA SISTEM BAHAN BAKAR MOTOR DIESEL UNTUK SISWA SEKOLAH MENENGAH KEJURUAN PADA KOMPETENSI SISTEM INJEKSI BAHAN BAKAR DIESEL Eko Budi Utomo; Dwi Widjanarko; Winarno Dwi Rahardjo
Jurnal MEKOM : Media Komunikasi Pendidikan Kejuruan Volume 4, Issue 2, Agustus 2017
Publisher : Fakultas Teknik, Universitas Negeri Makassar

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Abstract

Tujuan penelitian ini adalah untuk menguji kevalidan dan keefektifan multimedia pembelajaran sistem injeksi bahan bakar motor diesel. Penelitian ini menggunakan metode Research and Development / R&D dengan model pengembangan 4D model yang terdiri dari tahap Define (pendefinisian), tahap Design (perancangan), tahap Develop (pengembangan), disseminate (penyebaran). Uji coba produk dilakukan dengan desain eksperimen (before-after) yaitu dengan cara membandingkan hasil belajar sebelum dan sesudah memakai multimedia. Hasil penelitian menunjukkan bahwa multimedia yang dikembangkan sangat valid yang didasarkan pada penilaian dari validator ahli media dan valid berdasarkan penilaian ahli materi. Multimedia sistem injeksi bahan bakar motor diesel juga efektif diterapkan sebagai media dalam pembelajaran dengan hasil rata-rata belajar siswa (post-test) sebesar 78,92 lebih tinggi dari pada hasil belajar siswa (pre-test) sebesar 48,06. Hal ini terbukti dari hasil uji t bahwa ada perbedaan hasil belajar yang signifikan sebelum dan setelah menggunakan multimedia tersebut.
Penerapan Alat Peniris Minyak Sentrifugal untuk Meminimalkan Kandungan Minyak pada Berbagai Macam Olahan Makanan pada Usaha Kecil Kuliner di Kelurahan Sekaran Gunungpati Semarang Widjanarko, Dwi; Kusumaningtyas, Ratna Dewi; Yudiono, Heri; Kusumawardani, Rini; Widyastuti, Catur Rini
Jurnal Pengabdian Magister Pendidikan IPA Vol 7 No 4 (2024): Oktober-Desember 2024
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpmpi.v7i4.9574

Abstract

Sekaran is a fairly densely populated area because it is located around the Semarang State University campus. With this dense population, culinary businesses around Sekaran are also growing. Many culinary businesses produce fried foods of various types. The problem encountered in this culinary business is that there is still a lot of oil content in the food products. This of course can harm the health of consumers. The aim of this activity is to reduce the oil content in food. The solution used is to apply an oil drainer to food products produced by culinary businesses around Sekaran. The activities carried out include: providing an understanding of the dangers of food that contains a lot of oil, providing an explanation of how to drain oil from food quickly, and providing training in the use of a drainer. The results of the activities that have been carried out are 1) providing an explanation of the function of each part of the drainer. oil in food; 2) socialize the importance of reducing the oil content in fried foods; 3) education about the effects caused by the presence of oil in food; and 4) training on how to use tools to drain oil from food has been carried out through demonstrations of tool use.
EFFECTIVENESS OF LEARNING WITH INTERACTIVE MULTIMEDIA TO IMPROVE LEARNING OUTCOMES USING THE COMMAND FUNCTION IN MAKING 3D CAD DRAWINGS Alvin Maulana Al Bahri; Ari Dwi Nur Indriawan Musyono; Dwi Widjanarko; Sudiyono
Jurnal Pendidikan Teknik Mesin Vol. 10 No. 2 (2023): Jurnal Pendidikan Teknik Mesin
Publisher : Program Studi Pendidikan Teknik Mesin Fakultas Keguruan dan Ilmu Pendidikan Universitas Sriwiajaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jptm.v10i2.5

Abstract

The SMK learning process should direct students to have insight into the world of business or industry, one of which is CAD-based Manufacturing Engineering Drawing subject skills, but it turns out that student learning outcomes are known under the KKM. The aims of this study were to find out 1) the feasibility of interactive multimedia according to media and material experts 2) students' perceptions of the usefulness of interactive multimedia 3) the effectiveness of interactive multimedia to improve learning outcomes. This study used a quantitative approach to numerical data with the One-Group Pretest-Posttest design. involving control and experimental groups. The population of class XI machining students at SMKN1 Losarang. Samples of XITP 1 and XITP 2 students. The pretest results mean 56.99, median 56 mode 50 standard deviation 13.93. The posttest mean 81.86, median 83 mode 86 standard deviation 7.01, there is an increase in posttest scores due to the effect of interactive multimedia on students easily practicing 3D CAD drawings. Conclusion 1) Interactive multimedia learning to make 3D CAD drawings is considered quite feasible by media experts and appropriate by material experts 2) Students' perceptions of interactive Multimedia learning to make CAD drawings are considered quite useful 3) Student learning outcomes after using interactive multimedia in making 3D CAD drawings considered effective.
The Implementation of Interactive Media to Improve Student Achievement in Lighting and Signaling Systems Febrianti, Alfira Dwi; Widjanarko, Dwi; Abdurrahman, Abdurrahman
Journal of Vocational and Career Education Vol. 9 No. 2 (2024): December 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jvce.v9i1.25387

Abstract

Students’ limited understanding of lighting systems and signaling lamps is attributed to conventional teaching methods, insufficient practical tools, and the absence of interactive learning media. This study aimed to develop, assess the feasibility, and test the effectiveness of web-based interactive learning media on the subject. The method applied Research and Development (R&D) with the ADDIE development model. The research design adopted a Pretest-Posttest Control Group Design. The validation results indicated that the media was highly feasible for use, as shown by maximum eligibility scores. The effectiveness test, comparing the control and experimental groups, showed a significant difference. The improvement in students’ learning outcomes fell into the moderate category. Therefore, this learning media was proven to be both feasible and effective in enhancing students’ achievement on the topic of lighting systems and signaling lamps.
The Effectiveness of the Use of E-Module Sustainable Fashion in Improving the Cognitive Abilities of Vocational School Students Zulaekah, Dewi; Kusumastuti, Adhi; Widjanarko, Dwi; Wahyuningsih, Sri Endah
Journal of Vocational and Career Education Vol. 10 No. 1 (2025): July 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jvce.v10i1.30510

Abstract

The understanding of vocational students in the fashion skills program on the concept of sustainable fashion is still low due to the limitations of learning media that are less interesting and contextual. The material is delivered conventionally through textbooks and presentations that are less effective in helping students understand sustainability issues in the fashion industry. This study aims to determine the effectiveness of the use of sustainable fashion E-Modules in improving students' cognitive abilities. The method used is quantitative with a pretest-posttest control group design. The research sample consisted of 69 students in class X of the Fashion Skills Program at SMK Negeri 6 Semarang who were divided into experimental and control groups. The instruments used were in the form of pretest and posttest questions. Previous research data has gone through normality tests and homogeneity tests as tests of analysis requirements. The data analysis then used the Normalized Gain (N-Gain) test to measure the improvement in learning outcomes and the Independent Sample T-Test test to see significant differences between groups. The results showed that the average N-Gain of the experimental group was 76% in the effective category, while only 37% of the control group was in the less effective category. The T-Test showed a significance of 0.000 < 0.05 which means there is a significant difference between the two groups. From this study, it can be said that the use of E-Modules has been proven to be effective in improving students' cognitive abilities towards the concept of sustainable fashion.
The Effectiveness of Simulator Learning Media in Learning Motorcycle Charging Systems at Vocational High Schools Rohayati, Rohayati; Qudus, Nur; Widjanarko, Dwi
Journal of Vocational and Career Education Vol. 10 No. 1 (2025): July 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jvce.v10i1.30589

Abstract

The learning process of the motorcycle charging system at SMK Negeri Situraja still faces challenges, notably the low competency mastery of students who have not yet met the Minimum Competency Criteria. This issue arises from the limited time available for practical activities and the lack of varied and contextual teaching methods. This study aims to assess the effectiveness of the learning media, specifically a charging system simulator developed using the Project-Based Learning (PjBL) approach. The research method employed is Research and Development (R&D) with the ADDIE model, which includes the stages of analysis, design, development, implementation, and evaluation. The research results demonstrate that the developed simulator media is effective in improving students competency, particularly in understanding the operating principles and components of the charging system. This effectiveness is indicated by a significant improvement in learning outcomes after the simulator-based instruction. Additionally, students became more active, gained a deeper understanding of the material, and were able to apply the knowledge in independent and safe practices. The advantage of this media, compared to previous studies, is the security system that protects students during use. This feature ensures safety and creates a secure learning environment. Therefore, the PjBL-based simulator media is a suitable innovation for learning in vocational schools to support the achievement of optimal learning outcomes.
Development of the MyLathe Application Based on Discovery Learning to Improve Student Learning Outcomes in Lathe Machining at Vocational High Schools Kresnadi, Muh. Elvio Putra; Hadromi, Hadromi; Widjanarko, Dwi
Jurnal Penelitian Pendidikan Vol. 42 No. 2 (2025): October 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jpp.v42i2.30117

Abstract

This study aims to develop a learning application called MyLathe for eleventh-grade students in the Mechanical Engineering program at vocational high schools (SMK). The application is designed to support the discovery learning model and can be accessed via smartphones, laptops, and web platforms, enabling flexible and user-friendly learning experiences. The research employs the ADDIE development model, consisting of five phases: Analysis, Design, Development, Implementation, and Evaluation. The feasibility of MyLathe was evaluated through expert validation. Media expert validation yielded an Aiken’s V value of 0.93, while content validation scored 0.96, both indicating high validity. The reliability coefficients for both media and content exceeded 0.40, meeting acceptable standards. The effectiveness of the application was measured using an independent sample t-test, which yielded a t-value of 11.561, exceeding the critical t-table value of 1.999. This indicates a statistically significant improvement in student learning outcomes. Additionally, the N-Gain analysis showed an increase in the average pre-test score from 46.06 to a post-test score of 62.67 in the experimental class, with a comparable pre-test average of 46.84 in the control class. Practicality testing involving both teachers and students yielded a score of 92%, classified as “highly practical.” These findings suggest that the MyLathe application is a valid, reliable, effective, and practical digital learning tool for enhancing learning in machining subjects at vocational high schools.
Co-Authors - Abdurrahman  - Basyirun - Khusen  - Pramono  - Rusiyanto  - Wahyudi  Abdurahman Abdurrahman Abdurrahman Abdurrahman Abdurrahman Abdurrahman , - Adhi Kusumastuti Adi Nova Trisetiyanto Ahmad Afwan Fathoni Ahmad Ihwan Akbar, Muhammad Hafizt Ali Djamhuri Alvin Maulana Al Bahri Andi Irawan Andyka Rahmawan, Andyka Ardhiyanto Rizaldi Ardita, Ardita Ari Dwi Nur Indriawan Musyono Ashroful In&#039;am Bambang Haryadi Budiman, Febrian Arif Bunyamin Bunyamin Catur Rini Widyastuti, Catur Rini Chikam, David Badi’ul Childa Kumala Azzahri, Childa Kumala Cholifah, Ayu Danang Wahyu Pratama, Danang Wahyu Dwi Rahmad Setiyono Dzikie Agung Prasetyo, Dzikie Agung Edy Ismail Eko Budi Utomo Faizal Fakhri, Faizal Fathu Rahman  Wahid Febrianti, Alfira Dwi Hadromi - Hadromi Hadromi Handri Rama Pradani Hanna Lestari Hariyahya Arfidiansyah, Hariyahya Heri Yudiono Herman Dwi Surjono Herminarto Sofyan Hidayat, Hanif I Made Sudana Irene Nindita Pradnya J, Kuswidyaningrum N. Karend, Khanza Azizah Abas Khabiburrahman, Khabiburrahman Khabiburrahman, Khabiburrahman Khumaedi, Muhammad Khumaedi Khusaeni, Khusaeni Khusen , - Kresnadi, Muh. Elvio Putra Lestari, Iga Mawarni Ayu Maria, Yesicha mashudi, ali Mashudi, Ali Moch. Taufiq Ichsan Mohamad Aji, Mohamad Monelis Widyatama, Monelis Mudinillah, Adam Muhamad Sa’dullah, Muhamad Muhammad Khumaedi Nadya Alfa Cahaya Imani Novia Restu Windayani, Novia Restu Nur Fitriyanto, Joko Nur Qudus Oddie Febriyono, Oddie Pramono Pramono Pramono , - Putri, Firta Firdauzia Rakim, Rakim Ratna Dewi Kusumaningtyas Ratna Wardani Rini Kusumawardani, Rini Rodia Syamwil rohayati rohayati Rosyid, Arif Rusiyanto , - Samsudi . Samsudin Anis Saptariana - Saratri Wilonoyudho SATRIA, ANAS Sigit Bayu Aji Soesanto Soesanto Sonika Maulana Sri Endah Wahyuningsih Sucihatiningsih DWP Sudarman Sudarman Sudiyono Sugiyono . Sukoco, Imam Sunarto Sunarto Supraptono Supraptono Supraptono, Supraptono Supraptono, Supraptono Tahroni Tahroni, Tahroni Taka, Buyung Iman Utomo, Eko Budi Wahid, Fathu Rahman  Wahyudi Wahyudi Wahyudi Wahyudi Wahyudi , - Widi Widayat Widiastuti, C. Tri Widyastuti, Ratna Tri Winarno Dwi Rahardjo Winarno Dwi Rahardjo, Winarno Dwi Wirawan, Mohammad Arif Yanto, Muhammad Arrry Yeri Sutopo Zulaekah, Dewi