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All Journal Jurnal Sains dan Teknologi Jurnal Kimia dan Kemasan Jurnal Rekayasa Material, Manufaktur & Energi Jurnal Mekanik Terapan Mitra Akademia: Jurnal Pengabdian Masyarakat Teknologika Jurnal Sains dan Teknologi JURNAL POLI-TEKNOLOGI JURNAL ILMIAH TEKNIK INDUSTRI DAN INOVASI (JISI) Jurnal TNI Angkatan Udara Jurnal Polimesin Jurnal Sains Materi Indonesia Recent in Engineering Science and Technology Jurnal Abdimas Ilmiah Citra Bakti Jurnal Inkofar
Vika Rizkia
Politeknik Negeri Jakarta
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Pembentukan Lapisan Anodik Aluminium Oksida Melalui Metode Anodisasi Untuk Proses Pewarnaan Dyeing Pada Aluminium Rizkia, Vika; Susanto, Iwan; Gunadi, Gun Gun Ramdlan; Heryana, Ghany
JST (Jurnal Sains dan Teknologi) Vol. 12 No. 2 (2023): July
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jstundiksha.v12i2.53782

Abstract

Anodisasi adalah proses elektrokimia ramah lingkungan untuk memproduksi lapisan oksida tipis hingga berukuran nanometer pada permukaan logam sehingga menjadi lebih dekoratif, tahan lama, dan tahan korosi. Proses anodisasi dalam larutan H2SO4 digunakan guna mempersiapkan lapisan anodik aluminium oksida (AAO) untuk selanjutnya dilakukan pewarnaan dengan metode dyeing. Pengaruh rapat arus dan waktu celup anodisasi terhadap permukaan hasil pewarnaan serta ketahanan korosi logam aluminium di investigasi dalam penelitian ini. Spesimen aluminium murni dilakukan proses anodisasi dalam larutan 16% H2SO4 dengan rapat arus 1, 3, dan 5 A/dm2 selama 40 dan 60 menit untuk selanjutnya dilakukan pencelupan ke dalam larutan dyeing non elektrolitik. Hasil pewarnaan menunjukkan bahwa tingkat penyerapan zat warna paling tinggi dalam parameter rapat arus 3 A/dm2. Selain itu, peningkatan waktu celup hingga 60 menit dapat meningkatkan kepekatan warna yang diserap. Pengujian korosi menggunakan metode salt spray memperlihatkan bahwa proses anodisasi dan pewarnaan dapat meningkatkan ketahanan korosi pada logam aluminium. Hasil pengujian kekerasan Vickers menunjukkan bahwa semakin tinggi rapat arus menghasilkan penurunan kekerasan rata-rata pada permukaan aluminium hasil anodisasi.
Analysis of the effect of welding sequence and speed on the distortion of ASTM A36 joints by MIG method Purnama, Dewin; Rizkia, Vika; Garjati, Vina Nanda
Jurnal Polimesin Vol 21, No 5 (2023): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v21i5.4134

Abstract

The welding process with the Metal Inert Gas (MIG) method often produces distortions that are detrimental to product quality, one of the factors that affect the characteristics of the welding results is heat input. The heat input provided in the welding process is influenced by arc current, arc voltage, and welding speed, besides that the welding sequence can also affect the distortion of thin plates due to welding on materials such as ASTM A36 plates. The welding process uses welding wire/electrode type AWS ER 70S-6 with a diameter of 1.0 mm, the welding parameters applied are: voltage of 22 Volts, current of 150 Amperes, DC + Current type (DCEP), the shielding gas used is 100% Argon with a flow rate of 15 liters per minute, horizontal welding position (1G), the amount of heat input is differentiated by changing the welding speed and the welding sequence used is the stepping stone method. The results of the study using ANOVA indicate that welding distortion increases with an increase in input heat, the repetition of welding sequences leads to greater distortion due to thermal stress, and the welding sequence and input heat have an influence of 80.4% in reducing distortion.
Pengaruh Penambahan Variasi Fraksi Massa Serbuk Cangkang Kelapa Sawit (PKS) pada Sifat Mekanis Komposit Hibrid Fiberglass–Epoxy Vina Nanda Garjati; Vika Rizkia; Dewin Purnama; Tia Rahmiati; Amalina Shomami
INSOLOGI: Jurnal Sains dan Teknologi Vol. 5 No. 2 (2026): April 2026
Publisher : Yayasan Literasi Sains Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55123/insologi.v5i2.7924

Abstract

The demand for renewable energy sources in Indonesia continues to rise in line with national energy transition efforts. Wind energy represents a significant but underutilized potential, yet its development is hampered by high investment costs, particularly in manufacturing wind turbine blades that rely on expensive composite materials. This research aims to identify more economical and sustainable material alternatives without compromising the necessary mechanical strength. Hybrid composites were developed by combining fiberglass and palm kernel shell (PKS) powder as reinforcement within an epoxy matrix. Variations of PKS addition were set at 12 wt.%, 20 wt.%, and 24 wt.%. Flexural test results indicated that PKS addition significantly influenced flexural strength, with the highest value (169.67 MPa) observed in specimen A3 (12 wt.% PKS) and the lowest (58.74 MPa) in specimen A1 (24 wt.% PKS). Shore D hardness testing revealed a complex trend: specimen A4 (30% fiberglass) exhibited the highest hardness, whereas specimen A2 showed the lowest. These findings underscore the importance of balancing fiberglass and PKS proportions to achieve optimal and sustainable mechanical performance.
ANALISIS VARIASI WAKTU DELIGNIFIKASI DAN KONSENTRASI DEKSTRIN TERHADAP PEMBUATAN KERTAS TISU SERBET DARI LIMBAH TONGKOL JAGUNG Raiqa Biyan Sukmawijaya; Vika Rizkia; Emmidia Djonaedi
INKOFAR Vol. 9 No. 2 (2025)
Publisher : Politeknik META Industri Cikarang

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

Abstract

This study explores the potential of corn cobs as an alternative raw material for environmentally friendly tissue paper production. Corn cobs are rich in cellulose but contain lignin, which must be removed through a delignification process. In this research, soda delignification was applied with varied durations (30, 60, and 90 minutes), combined with the use of dextrin as a binding agent at concentrations of 5%, 10%, and 15%. The resulting tissue paper was evaluated based on Indonesian National Standards (SNI), focusing on tensile strength, water absorbency, sheet integrity, and grammage. The results showed that a delignification time of 60–90 minutes combined with 10–15% dextrin produced the best quality tissue paper. The sample treated for 60 minutes with 15% dextrin exhibited the highest tensile strength (400 N/m), while the sample treated for 90 minutes with 5% dextrin achieved the highest water absorbency (114 mm/10 minutes). These findings indicate that corn cob waste holds significant potential as a sustainable raw material for tissue paper production, supporting green manufacturing principles and agricultural waste valorization.
The Modification of the Runner and Ingate Geometry to eliminate Misrun Defects on the Piston using Gravity Die Casting Vika Rizkia; Muhammad Fernanda Alvi Yasin; Nabila Banowati; Veronika Noviaty
Recent in Engineering Science and Technology Vol. 1 No. 2 (2023): RiESTech Vol. 1 No. 2 Years 2023
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v1i02.13

Abstract

Piston is an essential component of an engine because it plays a crucial role in the combustion process that drives the motorcycle. Gravity dies casting has become an ideal method for producing pistons owing to its high-quality product, cost-effective with excellent dimensional accuracy, good surface finish, and performance characteristics. However, misrun defect may occur during metal filling and solidification. This study aims to find the suitable dimensions for motorcycle piston products without the presence of misrun using MAGMASoft. The geometry modification introduced in this research are an ingate area of 176, 264, and 352 mm2 as well as the angle of runner of 60, 160, and 180o. Modifying the ingate area to 264 mm2 and the angle of the runner to 160o eliminated the misrun defect in the piston product. This phenomenon results from the laminar flow, higher temperature, and quicker flow velocity of the molten metal as it fills the window (the thinnest part of the piston).
The Effect of 5wt.% and 10wt.% Salacca Frond Fiber Addition on Kevlar and Carbon Fiber Reinforced Epoxy using Vacuum Assisted Resin Transfer Molding (VARTM) Method for Bulletproof Vest Application Vina Nanda Garjati; Vika Rizkia; Nur Agnes Aggraeni; Muslimin
Recent in Engineering Science and Technology Vol. 1 No. 3 (2023): RiESTech Vol. 1 No. 3 Years 2023
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v1i03.27

Abstract

Bulletproof vests as self-protection for military personnel are generally made from synthetic fiber-reinforced composites. Kevlar and carbon fiber reinforced composites have been able to withstand bullet penetration rates and have lightweight characteristics, but production costs with synthetic fibers are relatively expensive. The use of substitute materials from natural fiber is very potential, due to the abundance of natural fiber, lightweight, and relatively cheap price. One of the potential natural fibers is fiber from the salacca midrib. This study focused on the effect of adding salacca frond fiber on the composite characteristics of Kevlar fiber and carbon fiber, with SiC and Al2O3 fillers. The manufacture of this composite is carried out by the Vacuum Assisted Resin Transfer Molding (VARTM) method. There are 4 variations of fiber volume fractions and fillers as reinforcement added to this composite. From the results of observations with SEM, the results of the matrix and reinforcement are well bound. The ballistic test results show that all variations of test samples can withstand the bullet rate so that it does not penetrate. The results of mechanical tests show that currently the addition of salacca frond fiber has not significantly improved the mechanical properties of the composite
An Analysis of the Effect of Feeder Volume on Shrinkage Porosity Defects in Piston Products through the Gravity Die Casting Process Nabila Banowati; Veronika Noviaty; Muhammad Fernanda Alvi Yasin; Sugeng Mulyono; Tia Rahmiati; Wandi Wahyudi; Vika Rizkia
Recent in Engineering Science and Technology Vol. 2 No. 2 (2024): RiESTech Vol. 2 No. 2 Years 2024
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v2i02.56

Abstract

To achieve defect-free casting (soundness casting) with a minimal amount of shrinkage porosity, refinement during the casting process is necessary. In the gravity die casting process, there are parameters that lead to product defects, especially in the casting design, focusing on the gating system and feeder system as pathways for the flow of molten metal to supply the molten metal into the mold cavity. This research was conducted to examine the effect of adding feeder dimensions on shrinkage porosity, specifically on Al-Si piston products with a Silicon content of 12-13%. Feeder dimensions were varied in nine variations by adding height and width to the feeder gate, initially measuring 90mm in height and 32mm in width, along with the addition of insulation to the feeder to retain the heat of the casting process. Cooling used water and argon, with water placed at the center core and pin core and argon placed on the outer mold, with a solidification time of 150 seconds and pouring time of 3 seconds considered constant. This study used a Computer Aided Engineering (CAE) approach, namely MagmaSoft or the application of software to model the gravity casting system process. The results showed the lowest percentage of shrinkage at feeder dimensions of 114mm in height and 45mm in width with a mold temperature of 220°C was 0.76% of the product
Enhancing Proton Exchange Membrane Fuel Cell (PEMFC) Performance through Optimized Design of Parallel Channel Bipolar Plates Moh Nurkhamal; Vika Rizkia; Vina Nanda Garjati; Radhi Maladzi
Recent in Engineering Science and Technology Vol. 3 No. 1 (2025): RiESTech Vol. 3 No. 1 Years 2025
Publisher : MBI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59511/riestech.v3i01.94

Abstract

In this modern era, the demand for efficient and environmentally friendly energy sources is increasing. One technology with significant potential to meet this demand is the Proton Exchange Membrane Fuel Cell (PEMFC). This study aims to investigate the influence of channel width and depth variations in parallel bipolar plate designs on PEMFC performance. Computational Fluid Dynamics (CFD) was employed to analyze hydrogen flow distribution and pressure across various design variations. The results demonstrate that channel width and depth significantly affect pressure distribution and flow velocity, which in turn influence the efficiency of the PEMFC system. Increasing channel width generally reduces maximum pressure, while deeper channels help to distribute pressure more evenly across the bipolar plate. Optimized channel width and depth can enhance PEMFC operational performance by reducing pressure drop and promoting uniform flow distribution.
Pengaruh Jenis Laminasi terhadap Kuat Tarik dan Perubahan Warna pada Pressure sensitive label PE White Miko Dwi Saputra; Vika Rizkia; Sahiba Sahila
JURNAL ILMIAH TEKNIK INDUSTRI DAN INOVASI Vol. 4 No. 3 (2026): Juli : Jurnal Ilmiah Teknik Industri dan Inovasi
Publisher : CV. ALIM'SPUBLISHING

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59024/jisi.v4i3.1981

Abstract

Pressure sensitive labels (PSLs) made of polyethylene (PE) white are widely used in the packaging industry due to their flexibility, moisture resistance, and ease of application on various substrates. This study aimed to examine the effect of glossy and matte lamination on the tensile strength and color difference (ΔE) of PE white PSLs. An experimental method was employed, with tensile testing conducted using a universal testing machine (UTM) in accordance with ASTM standards and color measurement performed using a spectrodensitometer based on the CIE Lab system. The samples were divided into three treatment groups, namely no lamination, glossy lamination, and matte lamination, with ink coverage controlled at two design conditions, full ink and minim ink. The results indicated that lamination type significantly affected both the mechanical and visual characteristics of the labels. In the tensile strength test, the highest mean value was obtained by one treatment group, indicating superior resistance to tensile loading. In terms of color stability, higher ΔE values indicated greater color change and lower lightfastness, whereas lower ΔE values reflected better color retention. Overall, the findings show that the combination of lamination type and ink coverage influences the performance of PE white PSLs in both mechanical strength and color stability.
PEMBERDAYAAN MASYARAKAT MELALUI PELATIHAN PENGELOLAAN DAN PENGOLAHAN SAMPAH DI KELURAHAN PONDOK RAJEG, KECAMATAN CIBINONG, KABUPATEN BOGOR Ifa Saidatuningtyas; Vika Rizkia; Dhea Tisane Ardhan; Rachmat Arnanda; Ratna Khoirunnisa; Vina Nanda Garjati
Jurnal Abdimas Ilmiah Citra Bakti Vol. 7 No. 1 (2026)
Publisher : STKIP Citra Bakti

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38048/jailcb.v7i1.6331

Abstract

Permasalahan sampah menjadi salah satu isu lingkungan yang semakin kompleks di Kabupaten Bogor, khususnya di Kelurahan Pondok Rajeg, Kecamatan Cibinong. Sebagian besar sampah rumah tangga yang dihasilkan masyarakat berupa sampah organik yang belum dikelola secara optimal sehingga berpotensi menimbulkan pencemaran lingkungan. Oleh karena itu, diperlukan upaya pemberdayaan masyarakat melalui peningkatan pengetahuan dan keterampilan dalam pengelolaan serta pengolahan sampah rumah tangga. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk meningkatkan kesadaran dan kemampuan masyarakat dalam melakukan pemilahan serta pengolahan sampah organik melalui pelatihan pengelolaan sampah dan pemanfaatan mesin pencacah kompos. Mitra kegiatan adalah masyarakat Kelurahan Pondok Rajeg, Kecamatan Cibinong, Kabupaten Bogor. Kegiatan dilaksanakan pada tanggal 30 Juli 2025 dengan metode pelatihan menggunakan pendekatan deduktif dan partisipatif. Tahapan kegiatan meliputi rekrutmen peserta, identifikasi kebutuhan melalui Forum Group Discussion (FGD), penyediaan sarana berupa tempat sampah tiga kategori (organik, anorganik, dan B3) serta mesin pencacah kompos, pelaksanaan penyuluhan dan praktik pengolahan sampah organik, serta evaluasi kegiatan melalui kuesioner pra dan pascapelatihan. Hasil kegiatan menunjukkan adanya peningkatan pemahaman masyarakat mengenai pemilahan sampah, pengelolaan sampah berbahaya dan beracun (B3), serta pemanfaatan sampah organik menjadi produk bernilai guna seperti kompos dan pupuk. Peserta juga mampu mengoperasikan mesin pencacah kompos untuk mempercepat proses pengolahan sampah organik. Dengan demikian, kegiatan ini berkontribusi terhadap peningkatan kesadaran lingkungan dan kemandirian masyarakat dalam mengelola sampah rumah tangga sekaligus memperkuat sinergi antara Politeknik Negeri Jakarta dan masyarakat dalam upaya pengurangan volume sampah di tingkat lokal.
Co-Authors Alifianto Dimas Aditya Amalina Shomami Arif Dermawan Arnanda, Rachmat Azam Milah Muhamad Badrul Munir, Badrul Bambang Suharno Belyamin Belyamin Damisih Dewin Purnama Dhea Tisane Ardhan Dhiya Luqyana Emmidia Djonaedi Fadlilah, Muhammad Garjati, Vina Nanda Ghany Heryana Gunadi, Gun Gun Ramdlan Hapsari, Ade Utami Ifa Saidatuningtyas Iqbal, Adimas Habib Iwan Susanto Jarot Raharjo Johny Wahyuadi Soedarsono Luqyana, Dhiya M. Abdul Ghofur Marentiko, Fahri Miko Dwi Saputra Moh Nurkhamal Muhammad Fernanda Alvi Yasin Muhammad Fernanda Alvi Yasin MUSLIMIN Muslimin Muslimin Muslimin Muslimin Nabila Banowati Nabila Banowati Nanda Gardjati, Vina Nisrina Zahrah, Firyal Noviardi, Luthfi Nur Agnes Aggraeni Nur Agnes Eka Anggraeni Pramono, Agus Edy Pravitasari, Retna Deca Rachmat Arnanda Radhi Maladzi Raiqa Biyan Sukmawijaya Ratna Khoirunnisa RATNA KHOIRUNNISA Ridlwan, Hasvienda Mohammad Ryan Nugraha Sahiba Sahila Saidatuningtyas, Ifa Sugeng Mulyono Sukmawijaya, Raiqa Biyan Tatun Hayatun Nufus Tia Rahmiati Tia Rahmiati Tisane Ardhan, Dhea Veronika Noviaty Veronika Noviaty Vina Nanda Garjati Vina Nanda Garjati Vina Nanda Garjati Wandi Wahyudi Yudha Pratesa