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All Journal Majalah Forum Teknik UGM Jurnal Sain Veteriner Jurnal Teknoin Seminar Nasional Aplikasi Teknologi Informasi (SNATI) Jurnal Ergonomi Indonesia (The Indonesian Journal of Ergonomic) J@TI (TEKNIK INDUSTRI) IPTEK The Journal of Engineering Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Jurnal Teknosains Jurnal Teknologi Rekayasa Mesin Journal of Engineering and Management in Industrial System Journal of Medical Physics and Biophysics The Indonesian Journal of Dental Research Majalah Kedokteran Gigi Indonesia Jurnal Ilmiah Teknik Industri Dental Journal (Majalah Kedokteran Gigi) Atrium : Jurnal Arsitektur Jurnal Sistem Teknik Industri Dinamika Kerajinan dan Batik : MAJALAH ILMIAH Jurnal Kreatif : Desain Produk Industri dan Arsitektur KESANS : International Journal of Health and Science Jurnal Material Teknologi Proses: Warta Kemajuan Bidang Material Teknik Teknologi Proses Journal of Material Processing and Characterization (JMPC) Journal of Fibers and Polymer Composites Jurnal Riset Rumpun Ilmu Teknik (JURRITEK) Jurnal Indonesia Sosial Sains Proceeding of International Conference Health, Science And Technology (ICOHETECH) Jurnal Ilmiah Teknik dan Sains (JITS) Prosiding Seminar Nasional Unimus Dinamika Kerajinan dan Batik: Majalah Ilmiah
Rini Dharmastiti
Department Of Mechanical And Industrial Engineering, Universitas Gadjah Mada, Yogyakarta, Indonesia
Arts Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Immunology & microbiology Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Veterinary

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The Effect of Build Orientation on Liquid Absorption and Wear of 3D-Printed Denture Materials Ikhlas, Muhammad; Cahyono, Sukmaji Indro; Prayoga, Benidiktus Tulung; Dharmastiti, Rini; Arifvianto, Budi; Mahardika, Muslim
IPTEK The Journal of Engineering Vol. 11 No. 1 (2025)
Publisher : Pusat Publikasi Ilmiah, Institut Teknologi Sepuluh Nopember.

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Up till now, denture has been widely used for resolving dental problems, especially those due to attrition. The attrition of tooth enamel could lead to wear and lowering the functions of normal teeth. So far, denture is made conventionally by using heat curing method in a mold. However, the complex geometries of teeth and oral cavity has led to the use of the more advanced techniques, such as additive manufacturing. In this research, the denture material fabricated by using digital light processing (DLP) additive manufacturing was studied in term of their liquid absorption capability and wear behavior. The specimen was printed with three build orientations, namely 0°/180°, 90°/90°, and 45°/135°. These are the degree between printing direction against sliding direction. An immersion and wear test were carried out in artificial saliva liquid. The result showed the lowest weight gain and dimensional change in the specimens printed with 90°/90° and 45°/135°. Meanwhile, the specimens prepared with build orientation of 0°/180° or printed with layer parallel to sliding direction demonstrated the smallest value of wear factor, indicating a better wear resistance compared to the others. A visual examination of the worn surface indicated delamination, abrasion and cracking as the possible wear mechanisms of the printed denture materials.
Analysis of Fire Protection System Requirements in Onshore Oil and Gas Exploration and Production Gathering Stations Bening Pahli, Joewan; Dharmastiti, Rini
Jurnal Indonesia Sosial Sains Vol. 7 No. 3 (2026): Jurnal Indonesia Sosial Sains
Publisher : CV. Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59141/jiss.v7i3.2227

Abstract

This research aims to evaluate and analyze the technical requirements of the fire protection system at the facility to ensure compliance with international safety standards and actual field conditions. The theoretical framework and evaluation instruments are based on National Fire Protection Association (NFPA) standards, including NFPA 11 (Foam Systems), NFPA 15 (Water Spray Fixed Systems for Fire Protection), NFPA 20 (Installation of Stationary Pumps for Fire Protection), and NFPA 2001 (Clean Agent Fire Extinguishing Systems), as well as standards from the American Petroleum Institute (API), such as API 2030 and API RP 2001. The research methodology uses an applied case study with a quantitative technical approach, consisting of field data collection, fire zone classification, determination of worst-case fire scenarios, and hydraulic calculations for water, foam, and pump pressure requirements. The analysis classifies the M-8 Gathering Station into eight fire zones, with Fire Zone 1 (Crude Oil Storage Tank Area) identified as the critical design case, having the highest fire-water demand of 1,195 GPM. The infrastructure analysis shows that the water pond capacity of 1,386 m³ and foam tank capacity of 5,151 liters are sufficient to meet a four-hour operational requirement. Hydraulic analysis indicates a required pump discharge pressure of 132.43 psig to ensure effective fire suppression. The study concludes that the designed fire protection system meets safety standards and recommends the installation of appropriate nozzles and clean agent systems to enhance fire safety and operational reliability at Gathering Station M-8.
Marigold Flower (Tagates erecta L.) as a Natural Yellow Food Colorant: Extraction Optimization and Stability Assessment Mukmin Sapto Pamungkas; Daffa Rafli Afrizal; Edia Rahayuningsih; Meiga Putri Wahyu Hardhianti; Rini Dharmastiti
Jurnal Ilmiah Teknik dan Sains Vol. 3 No. 3 (2026): April : Jurnal Ilmiah Teknik dan Sains (JITS)
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat AKIPBA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62278/jits.v3i3.112

Abstract

Marigold flowers (Tagetes erecta L.) are especially rich in carotenoids and are widely used as natural yellow food colorants. Previous studies on extracting carotenoids from marigolds mainly relied on single-factor methods, with limited focus on variable interactions or extract stability. This study aimed to optimize extraction conditions using response surface methodology and to assess the stability of the carotenoid extract during storage with commercial salt and sugar. Following four days drying of fresh marigold flower petals in the laboratory with air convection, extraction was carried out using either a Soxhlet extractor or a three neck round bottom flask (extraction). The total amounts of flavonoids, phenolics, and carotenoids in the fresh flower material were determined initially by using visible spectroscopy. A Central Composite Design (CCD) with a two-factor interaction (2FI) model was used to optimize extraction conditions, considering three variables: pH, temperature, and time. The coefficient of determination (R2) was 80.25%. The best extraction conditions were pH 5.9, 62.9 °C, and 67.1 minutes, resulting in a TCC of 3490 mg/100 g DW with a desirability of 1.000. Carotenoids showed greater stability in the presence of 2% citric acid or 3% salt, while 3% sugar reduced stability during 76 hours of storage.
Development of a Smartphone-Based Digital Reporting System to Optimize Radiation Safety Reporting in the Radiation Oncology Facility Elzar, Andri; Dian Pratiwi, Rita; Dharmastiti, Rini; Kusuma Frisky, Aufaclav Zatu
Jurnal KESANS : Kesehatan dan Sains Vol 5 No 8 (2026): KESANS: International Journal of Health and Science
Publisher : Rifa'Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54543/kesans.v5i8.638

Abstract

Introduction: Radiation safety reporting at the Radiation Oncology Facility of RSUD Dr. H. Abdul Moeloek was still paper-based, causing incomplete data, delayed reporting, and fluctuating Safety and Security Indicator (IKK) scores. Objective: This study aimed to develop and evaluate a smartphone-based digital reporting application to improve radiation safety reporting and safety culture. Method: This Research and Development study used the ADDIE model with mixed qualitative and quantitative approaches. The application was developed using the AppSheet low-code platform and validated by practitioners and media experts. Evaluation applied a one-group pretest-posttest design involving 30 radiation workers. Data were analysed using regression, paired t-test, and correlation analyses. Results and discussion: The SPEKTRA application achieved a validation score of 94.5% and was categorized as highly feasible. Post-implementation results showed significant improvements in perceived ease of use, perceived usefulness, intention to use, and safety culture (p < 0.001). Perceived usefulness was the dominant predictor of intention to use (β = 0.473; p = 0.022). Application adoption also significantly improved safety culture (p = 0.034). The projected IKK score increased from 75 in 2025 to 94 in 2026 through the integrated simulation feature. Conclusion: SPEKTRA effectively improved technology acceptance, safety culture, and radiation safety reporting management.
Design and usability evaluation of eLok mobile using a user-centered design Muhammad Nizar Ghozali; Rini Dharmastiti
Jurnal Teknosains Vol 15, No 2 (2026): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.111324

Abstract

eLOK is an e-learning platform based on a Learning Management System (LMS) used at Universitas Gadjah Mada. Currently, eLOK does not yet provide a mobile version that supports flexible access to learning anytime and anywhere. This study aims to design the UI/UX of the eLOK mobile version using a user-centered design approach and to evaluate its usability through the System Usability Scale (SUS). The participants involved in this study were 9 active students of Universitas Gadjah Mada who regularly use the eLOK website. The study identified several interface improvements, including redesigning the login page with the addition of a fingerprint login feature, modifying the menu layout, adding visual icons to the course search menu, introducing icons for assignments, materials, and videos on the course page, adding features for downloading materials and videos, and implementing a previously unavailable chat feature in the eLOK website version. Usability testing using the System Usability Scale produced an average score of 94.4, which falls into the “Best Imagine” category, indicating that the application demonstrates an excellent level of usability and aligns well with user expectations. These findings suggest that eLOK Mobile has strong potential to support more interactive, simulation-based, and practice-oriented learning. Features such as fingerprint login and chat also support user engagement and independent learning. Future development is recommended to integrate multimedia content and real-time communication tools in order to improve effectiveness, accessibility, and user performance in practice-based learning.
Surface roughness and topography on denture base material fabricated with additive manufacturing techniques Abizar Agung Wibawa; Budi Arifvianto; Rini Dharmastiti; Heribertus Dedy Kusuma Yulianto; Dibyo Pramono
Jurnal Teknosains Vol 15, No 2 (2026): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.116126

Abstract

Denture fabrication plays an important role in restoring oral functions, including mastication, speech, and esthetics, while also helping to prevent temporomandibular joint disorders. Conventional denture bases are commonly fabricated using heat-cured acrylic resin; however, this method still presents several limitations, including longer fabrication time, lower accuracy, and outcomes that are highly dependent on operator performance. The development of additive manufacturing technology offers several advantages, such as high reproducibility, improved accuracy in producing complex geometries, a more efficient digital workflow, and reduced material waste. This study investigated the effect of additive manufacturing using digital light processing (DLP) on the surface roughness and topography of denture bases fabricated with different printing layer thicknesses (50 μm and 100 μm), compared with conventional heat-cured acrylic resin bases. Disc-shaped samples with a diameter of 5 mm and a thickness of 2 mm were analyzed for surface roughness using a profilometer along a 2 mm straight line, while surface topography was observed using scanning electron microscopy (SEM). The results showed significant differences in surface roughness among the groups, where the additive manufacturing group with a 50 μm layer thickness exhibited the smoothest surface (0.96±0.26 μm), followed by the conventional heat-cured group (1.75±0.31 μm), while the additive manufacturing group with a 100 μm layer thickness showed the highest roughness value (4.27±0.55 μm). SEM analysis also revealed crater-like surface defects correlated with variations in layer thickness. These defects were observed more frequently in the additive manufacturing group with a 100 μm layer thickness compared with the 50 μm layer thickness group. These findings confirm the importance of additive manufacturing parameters in determining the final properties of denture bases and indicate the potential for optimizing fabrication techniques to achieve improved denture outcomes.
Co-Authors A.A. Ketut Agung Cahyawan W Abdullah, Muhammad J.Q. Abizar Agung Wibawa Amalia Kiswandari Andi Rahadiyan Wijaya, Andi Rahadiyan Ardiyanto Ardiyanto Arfan Fadilah Aria Fransiska Aufaclav Zatu Kusuma Frisky Bambang Moyoretno Bambang Moyoretno, Bambang Benidiktus Tulung Prayoga Bening Pahli, Joewan Budi Arifvianto Catur Septommy Chancard Basumerda Daffa Rafli Afrizal Darmanto Darmanto Dewi Arsih Sulistiani Dhirga Harisa Dian Pratiwi, Rita Dibyo Pramono Edia Rahayuningsih ELZAR, ANDRI Fadilah, Arfan Fajar Shodiq Permata Fitrianto, Taufik Ramadhan Frenky Satria Handoko, Handoko Hapsoro Agung Jatmiko Heribertus Dedy Kusuma Yulianto Hilya Mudrika Arini Ibnu Al-Taufiq Indah Pratiwi Indarto Indarto Indriany, Emmy Kurniasari, Fitri Leny Yuliatun Lientje Setyawati Lientje Setyawati Lusiana Pane Marcellino Aditya Mahendra Marsetyawan HNE Soesatyo Meiga Putri Wahyu Hardhianti Melita Puspitasari Mohammad Juffrie, Mohammad Muhamad Adhitya Nugroho Muhammad Ikhlas Muhammad Mirandy Pratama Sirat Muhammad Nizar Ghozali Mukmin Sapto Pamungkas Munim, Yulianda Sakinah Munim, Yulianda Sakinah Muslim Mahardika Nur Kaliwantoro Nuryono Nuryono Pararta, Wilhelmus A. Pipin Dwi Kartikasari Purnomo Purnomo Purnomo Purnomo Rahadyan Magetsari Rahmatika S, Devi Dwi Resti Efrata Eka Rethy Den Rina Susilowati Rusdaniaji, Danarwan Salim, Urip A. Salim, Urip Agus Salsabila, Zulfi Fathiya Saputro, Oktiyanto A. Setiyani, Rezki Siti Lestariningsih Siti Lestariningsih, Siti Siti Sunarintyas Sri Budi Barunawati Sukmaji Indro Cahyono, Sukmaji Indro Suprihatin Suprihatin Suyitno Suyitno Suyitno Suyitno Suyitno Suyitno W. Widjijono Wardoyo, Christianus Pigun Widasari, Putri Pratiwi Wijaya, Andi Rahadyan Yulianda Sakinah Munim