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All Journal Prosiding Seminar Nasional Sains Dan Teknologi Fakultas Teknik Rekayasa Mesin Journal of Engineering and Management in Industrial System Teknomekanik International Journal of Mechanical Engineering Technologies and Applications (MECHTA) Jurnal Polimesin TEKAD : Teknik Mengabdi
Femiana Gapsari MF
Universitas Brawijaya
Humanities Automotive Engineering Computer Science & IT Control & Systems Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences

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Surface Characterization on Electrophoretic Deposition Oof 316l Stainless Steel with Dissolved Chitosan for Biomedical Application Setyarini, Putu Hadi; Gapsari, Femiana; Harjo, Apollo Ode Rea
International Journal of Mechanical Engineering Technologies and Applications Vol. 3 No. 1 (2022)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2022.003.01.6

Abstract

Of many compounds materials, metallic biomaterial is widely used in human medical devices. An implant material's corrosion resistance impacts its flexibility and longevity. This corrosion resistance is also an important consideration for biocompatibility. This biomaterial contains stainless steel whcih may corrode after being installed in the human body since  the passivity of stainless steel disappears when it is exposed to acids in the human body for a long duration. In addition, lacks of oxygen inhibits the formation of a new Cr2O3 layer for corrosion protection. Based on this phenomenon, an advance treatment is required to improve the resistance corrosion of implant. This study investigates the effect of the concentration and duration of chitosan on the thickness and corrosion resistance of biomaterials. The concentration of chitosan used was 0.08%, 0.16%, and 0.24% while the voltage used was constant at 10 V. The test results demonstrated the lowest corrosion rate occrured for 0.24 % chitosan concentration with 30 minutes coating duration. The lowest corrosion rate achieved was 0.014 mmpy and the maximum thickness was 75.4 μm. This study could be then used as a new solution to increase the safety of existing implants using biodegradable and non-toxic compounds. The next experiment should be implantation in real human body.
CARDIAC BIOMETRICS AND PERCEIVED WORKLOAD REGRESSION ANALYSIS USING RANDOM FOREST REGRESSOR IN COGNITIVE MANUFACTURING TASKS Harmayanti, Afifah; Tama, Ishardita Pambudi; Gapsari, Femiana; Akbar, Zuardin; Juliano, Hans
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 1 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.01.11

Abstract

Workload is crucial in managing and maintaining good performance of human resources and allocations. In an advanced manufacturing industry, human job functions had shifted to cognitive tasks. Thus, cognitive workload evaluation should be used to monitor worker’s workload in optimal condition. Most common tool of cognitive workload tools are perceived measurement, like NASA – TLX questionnaire. Despite of its sensitivity to capture workload felt by the workers, this subjective measurement was prone to bias. Objective measurement utilizing biometrics data of the human body during working state was useful to eliminate bias. Cardiac biometrics were one of the many that were closely related to mental activity changes. The objective of this study was to understand the relationship of cardiac biometrics to perceived workload as an indicator of cognitive workload analysis. The study utilized four biometrics, heart rate, HRV low frequency power, total frequency power and ratio of low and high frequency power, were used to analyzed a one hour long cognitive based study case. The study case was designed in a manufacturing planning context referring to manufacturing aptitude tests, to induce cognition process on 30 participants. The biometrics and NASA – TLX score result of all the participants, were then calculated as effect size standardization before input into random forest regressor model to analyze relationship between cardiac biometrics and perceived workload. The result found a moderate relationship between the two (r2 = 0.576). Features importance also showed the most impactful feature to the model is the effect size of frequency power ratio. However, it is recommended to always consider evaluating multiple cardiac biometrics in workload analysis to ensure good model performance.
MODIFICATION OF WOVEN DENDROCALAMUS ASPER IN COMPOSITE APPLICATIONS Raharjo, Rudianto; Darmadi, Djarot Bangun; Gapsari, Femiana; Setyarini, Putu Hadi; Alamsyah, Fikrul Akbar
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.6

Abstract

The aim of this study is to examine the influence of immersing Petung Bamboo in a NaOH solution on the tensile strength (TS) of composites containing an epoxy matrix. Petung Bamboo Webbing was given 0%, 3%, 6% and 9%, soaking treatment. The Composite utilised in this investigation was fabricated by the Vacuum Assisted Resin Infusion technique. Tensile testing of composites is conducted according to the ASTM D638-1 standard. The findings indicated a positive correlation between the concentration of NaOH immersion and the adhesion between the woven surface of Petung Bamboo and the matrix. Consequently, the TS of the Composite was enhanced. However, increasing the concentrations beyond a certain point leads to more degradation of the lignin and cellulose in the fibers, resulting in a loss in the strength of the composite. The Petung Bamboo woven reinforced Composite achieved the highest TS of 136.06 MPa after being treated with a 6% NaOH immersion. This was followed by a 3% NaOH immersion treatment resulting in a TS of 106.04 MPa. Without any NaOH immersion treatment, the composite had a TS of 97.31 MPa. The lowest TS of the composite was observed after a 9% NaOH immersion treatment, measuring 90.79 MPa. The Petung Bamboo wicker-reinforced composite with NaOH immersion treatment showed higher fiber pullout and fiber-matrix debonding failures, while higher NaOH treatment concentration reduced these failures.
SUPERHYDROPHOBIC AND ANTIBACTERIAL COATINGS ON VARIOUS COTTON FABRICS USING ZNO AND AESO Wijaya, Hastono; Gapsari, Femiana; Sulaiman, Abdul M.; Harmayanti, Afifah; Barasa, Alvadro; Andrean, Janu; Warman, Sa Bashkaran Adi; Kriswardhana, Willy; Naimah, Azimatun
International Journal of Mechanical Engineering Technologies and Applications Vol. 5 No. 2 (2024)
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/MECHTA.2024.005.02.12

Abstract

Superhydrophobic coatings on cotton utilized in medical applications like hospital gowns and bed linens to offer a protective barrier against fluids and bacteria. Masks were worn with different types of materials. In this study, various cotton employed ZnO and AESO to effectively decrease the surface energy of cotton fabric via a Schiff base reaction. This chemical transformation resulted in the formation of a textured surface structure that exhibited robust adhesion qualities. The study demonstrates that the superhydrophobic coating on silk fabric increases 153. 59%. The coating on silk provides a reference for fabric types with ZnO and AESO coatings.
Enhanced structural and thermal properties of oil palm frond fiber-derived nanocellulose using chemical and mechanical treatments for eco-friendly composites Randis, Randis; Gapsari, Femiana
Jurnal Polimesin Vol 23, No 2 (2025): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i2.6270

Abstract

This study investigates the extraction and characterization of Cellulose Nanofibrils (CNFs) from Oil Palm Frond Fibers (OPFFs) using a combined chemical and mechanical treatment approach. Alkali treatment and bleaching effectively removed non-cellulosic components, increasing the Crystallinity Index (CI) from 58.75% in untreated OPFFs to 73.09% in Chemically Treated Microfibrillated cellulose (CMFs). Subsequent ultrafine grinding further enhanced the CI to 81.93%, demonstrating high purity and improved structural integrity. Thermogravimetric Analysis (TGA) revealed enhanced thermal stability, with the maximum degradation temperature rising from 286°C in OPFFs to 339°C in CNFs. X-ray Diffraction (XRD) analysis confirmed the retention of the cellulose of crystalline structure after all treatments. The novelty of this study lies in the systematic valorization of oil palm frond fibers, an abundant agricultural waste in Indonesia, through an integrated chemical-mechanical process to produce high-performance nanocellulose. These findings demonstrated that OPF-derived CNFs possess superior structural and thermal properties, making them strong candidates for reinforcing eco-friendly polymer composites in sustainable material applications
DESIGNING LINE BALANCING FOR AMMUNITION BOX PRODUCTION USING HEURISTIC METHOD Srijayasari, Hariti; Pratikto, Pratikto; Gapsari, Femiana
JEMIS (Journal of Engineering & Management in Industrial System) Vol. 6 No. 2 (2018)
Publisher : Industrial Engineering Department, Faculty of Engineering, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.jemis.2018.006.02.5

Abstract

PT XYZ is a State-Owned Enterprise that produces military equipment. Due to an increasing demand for such equipment every year, ammunition box sub-department asked their workers to work overtime and the total cycle time of ammunition box lid is higher than that of the ammunition box. Heuristic approaches, namely the Birnie Helgeson (RPW) and Moodie Young, are used to overcome these issues. This study aims to improve line balancing efficiency of ammunition box production. The findings showed that the Moodie Young method resulted in a 7.98% increase in line efficiency of the ammunition box lid and 21.77% increase in that of the ammunition box. In addition, the balance delay value decreased as much as the line efficiency. There are 9.09 and 152.87 decrease in the smoothing indexof the ammunition box lid and the ammunition box. The Moodie Young method cut the total labor cost to 9,597,170 rupiahs.
EFFECT OF ALKALI TREATMENT ON MECHANICAL AND THERMAL PROPERTIES OF SISAL FIBER FOR COMPOSITE APPLICATIONS Parahdiba, Nursyahbani Putri; Anam, Khairul; Gapsari, Femiana; He, Rui-En
International Journal of Mechanical Engineering Technologies and Applications Vol. 7 No. 1 (2026): January - June
Publisher : Mechanical Engineering Department, Engineering Faculty, Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776//MECHTA.2026.007.01.7

Abstract

The demand for sustainable and high-performance composite materials has driven extensive research on natural fiber reinforcements, including sisal fiber, to enhance their mechanical and thermal properties. However, the inherent hydrophilicity and weak interfacial adhesion of sisal fibers limit their effectiveness in composite applications. In this study, untreated and alkali-treated sisal fibers were characterized using tensile testing, Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). The results showed that alkali treatment reduced tensile strength from 2080 MPa to 1142.1 MPa but slightly increased elongation at break from 2.5% to 2.9%, while XRD analysis indicated a higher crystallinity index, and TGA confirmed improved thermal stability with an increased decomposition temperature from 220°C to 260°C. These findings provide valuable insights into optimizing sisal fiber treatment for enhanced fiber-matrix interactions, contributing to the development of more durable and sustainable natural fiber composites.
Design of Organic Material Chopping Machine As A Support for Waste Processing Activities at TPST BMR Mandiri Anam, Khairul; Gapsari, Femiana; Setyarini, Putu Hadi
TEKAD : Teknik Mengabdi Vol. 4 No. 2 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.tekad.2025.04.2.5

Abstract

TPST BMR “MANDIRI” is a centralized waste disposal site in Bumi Mondoroko Raya Housing. Until now, this TPST only functions as a temporary shelter. The waste that enters this TPST will be sorted into plastic waste and organic waste. Organic waste will be put into a container that will be picked up regularly by the environmental service. One of the main problems of this TPST is the volume of the container. The longer the organic waste that enters the more so that the available containers cannot accommodate it. So a way is needed to overcome this problem. The solution offered is the manufacture of an organic waste chopping machine, especially vegetables. The hope is that with this machine, the volume of containers for organic waste can be reduced and the chopped vegetables can be used for the fertilizer making process. Where the sale of this organic fertilizer can increase the income of this TPST. The output target of this community service activity is the making of a organic material chopping machine with a certain capacity.
Co-Authors A.A. Ketut Agung Cahyawan W Akbar, Zuardin Alief Wikarta Anam, M. Khairul Andikusuma, Chandya Andrean, Janu Angga Saputra Ariatedja, Julendra Ayunin, Aliya Qurrota Barasa, Alvadro Budi Purnomo Darmadi, Djarot Bangun Dina, Atikah Aulia Djarot B. Darmadi Dwi Hadi Sulistyorini Fikrul Akbar Alamsyah Franscisca Gayuh Utami Dewi Hariti Srijayasari Hariti Srijayasari Harjo, Apollo Ode Rea Harmayanti, Afifah He, Rui-En I Made Londen Batan Ishardita Pambudi Tama Juliano, Hans Khoo, Sze Wei M.Pd S.T. S.Pd. I Gde Wawan Sudatha . Naimah, Azimatun Nugroho Bagus Parahdiba, Nursyahbani Putri Pratikto Pratikto Pratikto, Pratikto Putu Hadi Setyarini Randis Randis Rudianto Raharjo Slamet Wahyudi Srijayasari, Hariti SUBEKTI, FAJAR Sugiarto S Sulaiman, Abdul M. Suparjon Suparjon Syarif Hidayatullah Warman, Sa Bashkaran Adi Wijaya, Hastono Willy Kriswardhana