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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 Automotive Science and Education Journal
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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Development of a Virtual Tissue Culture Laboratory to Improve the Cognitive Abilities of Vocational School Students Studying Plant Agribusiness Cholifah, Ayu; Widjanarko, Dwi; Anis, Samsudin
Journal of Vocational and Career Education Vol. 10 No. 2 (2025): December 2025
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jvce.v10i2.32412

Abstract

The problem that arises during tissue culture learning is the limited laboratory facilities. The imbalance between the amount of equipment and the number of students causes the practicum to be carried out in turns for a long time, and is less efficient. The impact is that most students, after being assessed, obtain scores that are not as expected. Due to these problems, efforts are needed to utilize multimedia in virtual laboratories. This study aims to develop a virtual tissue culture laboratory at the Agribusiness Plant and Horticulture Vocational School and analyze the feasibility and effectiveness of the virtual tissue culture laboratory at the Agribusiness Plant and Horticulture Vocational School. This study uses the ADDIE (Analysis, Design, Development, Implementation, and Evaluation) development model. The experimental method used is a one-group pre-test-post-test design, with the selected sample being the XI ATPH class, which has 36 students in the experimental class and 36 students as instrument testing subjects. The results showed that the virtual laboratory was categorized as feasible for tissue culture learning based on assessments by media and material experts. The virtual laboratory was also considered very practical for tissue culture learning. Based on the N-Gain Score calculation, the virtual laboratory improved tissue culture learning outcomes with a high category. This study concludes that the virtual laboratory can overcome the problem of limited practical facilities.
Alteration of Biodiesel Properties and Automotive Diesel Engine Performance due to Temperature Variation of the Transesterification Process Widjanarko, Dwi; Kusumaningtyas, Ratna Dewi; Fathoni, Ahmad Afwan
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 Setiyono, Dwi Rahmad; Widjanarko, Dwi
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.
Development of an Internet of Things-Based Scoreboard Learning Media for Mechatronics Control Technique Education Fauzi, Yoyon; Sutopo, Yeri; Widjanarko, Dwi
Journal of Vocational and Career Education Vol. 8 No. 2 (2023): December 2023
Publisher : Universitas Negeri Semarang

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Abstract

This research is motivated by the need for students in the Electronics Engineering program to master technology that meets the demands of the workforce, one of which is the Internet of Things (IoT). However, based on observations and interviews with Control Engineering teachers at SMK Negeri 1 Bawang, this technology has not been optimally taught. Therefore, there is a need to develop IoT-based learning media. This study aims to develop an IoT-based scoreboard learning media, and to evaluate its feasibility, practicality, and effectiveness. The research employs the Research and Development method using the ADDIE model, which includes five stages: Analyze, Design, Development, Implementation, and Evaluation. Data were collected using media feasibility assessment sheets, material feasibility assessment sheets, product practicality questionnaires, and tests. The data analysis methods used in this study include (1) categorical analysis to determine the feasibility level of the learning media; (2) reproducibility and scalability coefficients to determine the practicality of the learning media; and (3) N-Gain to measure the effectiveness of the learning media. The results show that the developed learning media has a high level of feasibility. The practicality of the product was rated as practical based on user assessments. Additionally, the improvement in student learning outcomes, as indicated by the N-Gain scores, demonstrates that the learning media is effective for use.    
Development of an Android-Based E-Module to Enhance Solo Puteri Bridal Makeup Competence Mu’daim, Syarifah; Widjanarko, Dwi; Kusumastuti, Adhi
Journal of Vocational and Career Education Vol. 8 No. 2 (2023): December 2023
Publisher : Universitas Negeri Semarang

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Abstract

Currently, the instructional videos on Solo Puteri bridal makeup, sourced by instructors from YouTube, only cover certain aspects of the curriculum for Solo Puteri bridal makeup courses. Educators often face time constraints when creating their own audiovisual learning materials. This study aims to (1) assess the feasibility of an Android-based e-module using App Inventor for Solo Puteri bridal makeup competence; (2) evaluate the effectiveness of the Android-based e-module using App Inventor for Solo Puteri bridal makeup competence; (3) determine the practicality of the Android-based e-module using App Inventor for Solo Puteri bridal makeup competence.The research model utilized in this study is the ADDIE model (Analysis, Design, Development, Implementation, and Evaluation). The development research subjects consist of 12 active students majoring in Makeup at AKS Ibu Kartini Semarang. Data analysis methods include the Content Validity Index (CVI) and Percentage of Agreement (PA) for feasibility testing, t-tests and N-gain for effectiveness testing, and reproducibility coefficient (Kr) and scalability coefficient (Ks) for practicality testing.The study results are as follows: (1) The product developed is an e-module for Solo Puteri bridal makeup; (2) The product is deemed feasible based on a Content Validity Index (CVI) score of 1 from media experts, a Percentage of Agreement (PA) of 100%, and a CVI score of 1 and PA of 100% from material experts; (3) Product trials show an effectiveness level of 0.67, with an effectiveness percentage of 67.36%, indicating a moderate effect and that the e-module is reasonably effective; (4) The reproducibility coefficient (Kr) is 94% and the scalability coefficient (Ks) is 72%, suggesting that the e-module for Solo Puteri bridal makeup is practical
Implementation of a Steam-Based Module Integrating Mathematics Geometry to Cultivate Vocational Values Kartikasari, Dewi; Basyirun , Basyirun; Sutopo, Yeri; Widjanarko, Dwi
Journal of Vocational and Career Education Vol. 9 No. 1 (2024): July 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jvce.v9i1.17249

Abstract

A teacher’s role involves creating an environment that stimulates and fosters critical thinking skills. One effective approach to promoting vocational values is through integrating mathematics geometry lessons with STEAM-based methods by developing learning modules that serve as independent teaching materials accessible to students. This research aims to design and develop a mathematics geometry learning module for fifth-grade students to instill vocational values. The study follows a Research and Development (R&D) methodology, employing the ADDIE development model. Data collection methods include interviews and questionnaires, analyzed through qualitative and quantitative techniques.The findings demonstrate that the quality of the developed learning module, as validated by five experts; two media specialists from BBPPMPV BOE East Java and three mathematics teachers from Al-YA’LU Excellent Elementary School in Malang meets high standards. Media experts rated the module’s design feasibility with an average score of 3.46, categorized as “highly feasible.” Subject matter experts evaluated the module’s content feasibility with an average score of 3.91 (“highly feasible”), linguistic feasibility at 3.93 (“highly feasible”), and contextual feasibility at 4 (“perfect”).
Learning Achievements in Maintenance of ABS (Antilock Braking System) Brake System Through PBL Mushthofaina Al Akhyar, Zidane; Widjanarko, Dwi; Sutopo, Yeri
Journal of Vocational and Career Education Vol. 9 No. 1 (2024): July 2024
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jvce.v9i1.18648

Abstract

The conventional approach of current learning media and the limited utilization of Android technology among students as a learning medium highlight the need for improvements and updates in how information is delivered from teachers to students. Transitioning from traditional methods to more modern approaches, particularly by leveraging existing technology, is essential. This study aims to develop Android-based interactive multimedia using the Problem-Based Learning (PBL) model to enhance learning achievements in the maintenance of ABS (Antilock Braking System) brake systems. It evaluates the feasibility and the improvement in learning outcomes among students in the Light Vehicle Engineering Department at SMK Muhammadiyah 2 Semarang in cognitive, affective, and psychomotor domains. The research employs the ADDIE development model, which includes Analysis, Design, Development, Implementation, and Evaluation. The experimental design used is a Pretest-Posttest Control Group Design. The subjects consist of 60 eleventh-grade students from the Light Vehicle Engineering Department, divided into control and experimental groups. The results of the feasibility assessment by media and material experts are 83.20% (“Feasible”) and 88.78% (“Highly Feasible”), respectively. Improvements in learning outcomes are reflected in the N-Gain test results, with the experimental group achieving an average score of 0.4619, categorized as “Moderate,” while the control group achieved an average score of 0.2588, categorized as “Low.” Based on the N-Gain calculations, it can be concluded that the use of Android-based multimedia through the Problem-Based Learning model in ABS brake system maintenance materials is “Effective”.
PERBANDINGAN KINERJA SISTEM LAMPU KEPALA MODEL KONTROL ARUS DAN KONTROL MASSA DENGAN VARIASI LAMPU HALOGEN DAN LED Muhammad Ikhwan Rifqi; Dwi Widjanarko
Automotive Science and Education Journal Vol. 13 No. 2 (2024): Automotive Science and Education Journal
Publisher : Universitas Negeri Semarang

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Abstract

Abstrak Sistem penerangan lampu kepala merupakan bagian dari sistem kelistrikan pada kendaraan. Lampu yang banyak digunakan dalam kendaraan yaitu jenis Halogen dan LED, sistem pengendali yang digunakan ada dua jenis yaitu sistem pengendali negatif dan positif. Tujuan dari penelitian ini yaitu untuk mengetahui perbandingan kinerja dari sistem kendali positif dan negatif pada lampu Halogen dan LED berupa arus, tegangan, daya, dan intensitas cahaya lampu. Penelitian ini menggunakan metode eksperimen dengan penghitungan daya untuk menentukan daya  pada lampu. Pengujian dilakukan dengan rangkaian pengendali negatif dan positif, masing – masing menggunakan lampu Halogen dan LED dan dilakukan sebanyak 3 kali percobaan pada masing – masing rangkaian.  Hasil penelitian ini menunjukkan bahwa arus listrik pada lampu Halogen 460% lebih besar dibanding pada lampu LED. Tegangan pada Lampu LED 23% lebih besar dibanding lampu Halogen Intensitas cahaya pada lampu LED jarak jauh 141,14% lebih besar dibanding pada lampu Halogen, pada mode jarak dekat intensitas cahaya lampu LED 363% lebih dibanding pada lampu Halogen. Daya listrik pada lampu Halogen lebih besar 353 % dibanding daya listrik pada lampu LED.   Abstract The headlamp lighting system is part of the vehicle's electrical system. The lights that are widely used in vehicles are Halogen and LED types. There are two types of control systems used, namely negative and positive control systems. The aim of this research is to compare the performance of positive and negative control systems for halogen and LED lamps in the form of current, voltage, power and light intensity. This research uses an experimental method with power calculations to determine the power of the lamp. The test was carried out with negative and positive control circuits, respectively using Halogen and LED lamps and carried out 3 trials in each circuit. The results of this research show that the electric current in Halogen lamps is 460% greater than in LED lamps. The voltage on LED lamps is 23% greater than that of Halogen lamps. The light intensity of long distance LED lamps is 141.14% greater than that of Halogen lamps, in short distance mode the light intensity of LED lamps is 363% greater than that of Halogen lamps. The electrical power of Halogen lamps is 353% greater than the electrical power of LED lamps.
PENGARUH NILAI RESISTANSI SENSOR ENGINE COOLANT TEMPERATURE DAN GANGGUAN PADA INJEKTOR TERHADAP KONSUMSI BAHAN BAKAR DAN EMISI GAS BUANG Valentinus Arsfendi Fernando; Dwi Widjanarko
Automotive Science and Education Journal Vol. 13 No. 1 (2024): Automotive Science and Education Journal
Publisher : Universitas Negeri Semarang

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Abstract

Penelitian ini bertujuan untuk mengetahui perbedaan nilai konsumsi bahan bakar dan emisi gas buang yang dihasilkan oleh mesin 4 langkah Honda Brio Tahun 2016 kapasitas mesin 1200 cc dengan memberikan treatment terhadap sensor ECT dan injektor. Penelitian ini menggunakan metode eksperimen untuk mengumpulkan data. Hasil pengujian konsumsi bahan bakar terendah pada nilai resistansi 100 Ω, sedangkan untuk pengujian konsumsi tertinggi pada resistansi 5000 Ω. Hasil pengujian emisi gas buang yang terendah pada nilai resistansi 100 Ω mempunyai kadar nilai emisi CO 0,01 %, HC 56,6 ppm, CO2 14,8 %, pada injektor trouble nilai CO 0,116%, HC 89,3 ppm dan CO2 10,76 %. Sedangkan pada  5000 Ω  mempunyai kadar nilai emisi tertinggi CO 0,44%, HC 208,6 ppm, CO2 13,4%, pada kondisi injektor trouble mempunyai kadar emisi CO 0,76%, HC 248 ppm dan CO2 9,3 %.
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'am Bambang Haryadi Basyirun , Basyirun 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 Dewi Kartikasari Dwi Rahmad Setiyono Dzikie Agung Prasetyo, Dzikie Agung Edy Ismail Eko Budi Utomo Faizal Fakhri, Faizal Fathoni, Ahmad Afwan Fathu Rahman  Wahid Fauzi, Yoyon 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 Ikhwan Rifqi Muhammad Khumaedi Mushthofaina Al Akhyar, Zidane Mu’daim, Syarifah 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 Setiyono, Dwi Rahmad 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 Valentinus Arsfendi Fernando 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