Article Per Year (5 Year)
p-Index From 2021 - 2026
0.702
P-Index
This Author published in this journals
All Journal Justek : Jurnal Sains Dan Teknologi Jurnal Inovasi Teknologi Terapan Smart Dedication: Jurnal Pengabdian Masyarakat
Riztamala Diana
Politeknik Manufaktur Negeri Bangka Belitung
Agriculture, Biological Sciences & Forestry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Nursing Public Health Social Sciences

Published : 4 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 4 Documents
Search

 1 
The Effect of Seawater and Sea Sand Composition Ratio on the Characterization of Voltage and Electric Current Riztamala Diana; Daya Wulandari; Putri Afifa Nur Oktadina; Roviu Darojat
Justek : Jurnal Sains dan Teknologi Vol 9, No 1 (2026): March
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i1.37799

Abstract

The limited availability of fossil fuels and their environmental impacts have encouraged the development of more environmentally friendly alternative energy sources. One of the methods of renewable energy is to utilize seawater and sea sand. This research aims to analyze seawater and sea sand in generating electrical energy. Source of seawater and sea sand from Tongachi Beach Bangka Belitung Indonesia. The research method was mixing seawater and sea sand with a ratio of 100:0%, 70:30%, 50:50%, 30:70%, dan 0:100%.  Measure the seawater according to the percentage 100%, 70%, 50%, 30% and 0%. Then Weigh the sea sand according to the percentage ratio 0%, 30%, 50%, 70% and 100%.  Add the seawater and sea sand to the mixing container according to the weighed ratio. The electrical energy generated is determined by observing the current flow and power are seen on the multimeter. The results showed that the composition ratio of 100:0 % seawater and sea with a voltage of 0.67 V, an electrical current of 0.2 mA and a power of 0.134 watts. It has of the analysis of the composition of seawater and sea sand can potentially be used as a source of electrical energy.                           
Life Cycle Assessment (LCA) of Biodiesel Production from Coconut Pulp Using In-Situ Transesterification with Microwave Energy Daya Wulandari; Riztamala Diana; Godlove Elioth Kiswaga; Leila Utarina; Devina Sanchia Samosir; Marisa Tri Octavia
Justek : Jurnal Sains dan Teknologi Vol 9, No 2 (2026): June
Publisher : Unversitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/justek.v9i2.38010

Abstract

Coconut pulps are solid waste from coconut processing that has had its coconut milk extracted, with a remaining oil content of around 12.2–15.9%. The processing of coconut pulp is not yet optimal, and this waste has the potential to be utilized as renewable energy in the form of biodiesel. Biodiesel is produced through an in-situ transesterification process assisted by microwave energy. This study aims to identify the potential environmental impacts of biodiesel production from coconut pulp as fuel. A Life Cycle Assessment (LCA) was conducted using the cradle-to-gate approach with the SimaPro ver. 9.4.0.3 data processing application and a database similar to the eco-invent database. The environmental impact assessment was analyzed using the EF 3.0 Method (adapted) V1.03 / EF 3.0 normalization and weighting set. The results show that among the stages of the biodiesel production process, the transportation of raw materials and supporting materials has the greatest impact on climate change compared to other stages. The transportation stage contributed 78.19 kg CO₂-eq out of a total of 204.35 kg CO₂-eq in the climate change category and dominated energy resource use at 1108.14 MJ out of a total of 1742.17 MJ. In addition, the preparation stage also contributed significantly to climate change, with emissions reaching 56.21 kg CO₂-eq. The large contribution from the transportation stage was mainly caused by exhaust gas emissions from vehicles used to transport raw materials and supporting materials. Based on the LCA results, environmental performance improvements or continuous improvements that can be implemented include optimizing logistics, regulating fuel use, selecting the nearest sources of raw materials, and improving energy efficiency during the preparation stage to support more sustainable biodiesel production from coconut pulp.
Pengaplikasian Baterai Lithium Ion pada DYE Sensitized Solar Cell (DSSC) dengan Sistem Building Integrated Photovoltaic (BIPV) Rumah Tinggal Daya Wulandari; Riztamala Diana; Leila Utarina; Mitha Pratiwi
Jurnal Inovasi Teknologi Terapan Vol. 4 No. 1 (2026): Jurnal Inovasi Teknologi Terapan
Publisher : Politeknik Manufaktur Negeri Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33504/jitt.v4i1.353

Abstract

Solar energy can be converted into electricity using photovoltaic systems as a strategic measure to achieve the renewable energy mix targets outlined in the National Energy Policy. Photovoltaic Rooftop (PV Rooftop) systems integrated with Building Integrated Photovoltaics (BIPV) present a viable alternative. PV Rooftop technology is currently trending, as evidenced by its increasing adoption in both industrial and residential sectors, supported by the global decline in solar panel prices. However, from an architectural perspective, silicon-based PV panels can reduce the aesthetic appeal of buildings. An emerging solution promoted by architects worldwide is the implementation of semi-transparent, dye-sensitized solar cells (DSSC), which are sensitive to colorants. In addition to their functional properties, DSSCs offer high aesthetic value due to the pigments used. Urban areas hold significant potential for the development of off-grid DSSC photovoltaic systems installed on rooftops and building facades. This study focuses on the analysis of off-grid DSSC PV systems for a type 42 residential house in Palembang City. The research employs a quantitative approach, using literature review and field measurements, followed by technical calculations. The article details the components required for designing an off-grid DSSC photovoltaic system capable of supplying all household electrical loads.
Pengenalan Teknologi Otomasi melalui Workshop Berbasis PLC dan HMI bagi Siswa SMAS Setia Budi Sungailiat Andreanto Jasman Duli, Sirlus; Putra Maulana, Ade; Wulandari, Daya; Hero Istoto, Enggar; Faristasari, Evvin; Peprizal, Peprizal; Diana, Riztamala; Indriati, Titin
Smart Dedication: Jurnal Pengabdian Masyarakat Vol. 3 No. 2 (2026): Smart Dedication : Jurnal Pengabdian Masyarakat
Publisher : SMART SCIENTI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70427/smartdedication.v3i2.320

Abstract

Perkembangan teknologi otomasi industri menuntut siswa memiliki wawasan awal mengenai perangkat dan prinsip kerja sistem kendali. Kegiatan pengabdian kepada masyarakat ini bertujuan memperkenalkan teknologi otomasi berbasis Programmable Logic Controller (PLC) dan Human–Machine Interface (HMI) kepada siswa SMAS Setia Budi Sungailiat. Kegiatan dilaksanakan di Laboratorium PLC Politeknik Manufaktur Negeri Bangka Belitung dengan melibatkan 10 siswa kelas XII yang dipilih secara purposif. Jumlah peserta disesuaikan dengan kapasitas laboratorium dan ketersediaan perangkat praktik. Metode yang digunakan berupa workshop edukatif-aplikatif melalui pemaparan konsep dasar otomasi, demonstrasi perangkat, diskusi interaktif, dan praktik terbimbing menggunakan simulasi lampu lalu lintas berbasis PLC dan HMI. Evaluasi dilakukan menggunakan angket respons skala Likert 1–5 dan observasi keterlibatan peserta oleh lima pengamat. Data dianalisis secara deskriptif berdasarkan nilai rata-rata dan persentase capaian. Hasil angket pada sembilan butir pascakegiatan menunjukkan rata-rata 4,82 dari skala 5 atau 96,44%. Aspek manfaat simulasi dan pelaksanaan workshop masing-masing mencapai 98%, sedangkan keterlibatan dan minat peserta mencapai 100%. Nilai terendah terdapat pada pemahaman hubungan input, proses, dan output, yaitu 84%. Hasil observasi menunjukkan keterlibatan peserta sebesar 92,50%, sedangkan keterlibatan verbal mencapai 70%. Temuan ini menunjukkan bahwa simulasi, visualisasi HMI, dan demonstrasi perangkat memperoleh respons positif serta mendukung keterlibatan peserta dalam pengenalan teknologi otomasi.
Co-Authors Ade, Ade Putra Maulana Andreanto Jasman Duli, Sirlus Daya Wulandari Devina Sanchia Samosir Evvin Faristasari Godlove Elioth Kiswaga Hero Istoto, Enggar Leila Utarina Marisa Tri Octavia Mitha Pratiwi Peprizal, Peprizal Putri Afifa Nur Oktadina Roviu Darojat Titin Indriati