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FaST : Jurnal Sains dan Teknologi
Published by Universitas Pelita Harapan
ISSN : -     EISSN : 25989596     DOI : -
Core Subject : Science, Social,
Computer Science & IT Environmental Science
Started in 2017, FaST publishes articles in the areas of science and technology, particularly in food technology, biology, electrical engineering, industrial engineering, mathematics and civil engineering. Articles are either reviews and/or research results.
Arjuna Subject : -
Articles 242 Documents
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Fermentation Using Providencia stuartii and Salmonella enterica to Produce N-Acetylglucosamine from Shrimp Shells’ Chitin Halim, Yuniwaty; Chanan Din, Nabilah binti; Soedirga, Lucia C.
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 9 No. 1 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10385

Abstract

Chitin is a biopolymer that can be extracted from exoskeleton of shrimp shells and other arthropods. One of its derivatives is N-acetylglucosamine that is comprised of glucose and amino acid glutamine. N-acetylglucosamine is known for its health effect, particularly in the treatment of osteoarthritis symptoms. One of the methods to produce N-acetylglucosamine is by fermentation using chitinolytic microorganisms. The aim of this research was to determine the optimum condition (pH, ratio of bacteria, fermentation time, and temperature) for fermentation using the combination of Providencia stuartii and Salmonella enterica to produce N-acetylglucosamine. The research was conducted at different pH (5, 6, 7, 8, 9) and bacterial ratios (3:1, 1:1 and 1:3). Furthermore, the optimum incubation temperature (30, 37, 40oC) and fermentation time (1, 2, 3 and 4 days) were also evaluated. The results showed the optimum condition was achieved at pH 8 with bacterial ratio of 1:1, incubated at 37oC for 3 days.  Under these conditions, N-acetylglucosamine concentration obtained was 87,707.04 ± 906.54 ppm.
The Role of Geopolymer Concrete in Achieving Sustainable Development Goals Wibowo, Kevin Aprilio; Widjajakusuma, Jack
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 9 No. 1 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10386

Abstract

A sense of safety and comfort is a fundamental right for all people. The United Nations strives to fulfil this through the establishment of 17 Sustainable Development Goals (SDGs). The construction sector plays a significant role in achieving these goals, particularly in the areas of Good Health and Well-being, Clean Water and Sanitation, Decent Work and Economic Growth, Sustainable Cities and Communities, Responsible Consumption and Production, and Climate Action. One key effort in the construction sector is replacing Portland cement with pozzolanic materials. Cement production emits large amounts of carbon dioxide, contributing substantially to global warming. To address this, pozzolanic materials such as fly ash are used as a substitute for cement in the production of geopolymer concrete. Based on compressive strength tests on cylindrical specimens and flexural strength tests on beam specimens, geopolymer concrete demonstrates high potential for structural applications. Its mechanical performance is comparable to that of conventional concrete, making it a promising alternative that supports sustainable development in the construction industry.
Optimization of Galangal Essential Oil Stik Balsam Formula (Alpinia galanga (L.) Willd.): [Optimization of Galangal (Alpinia galanga (L.) Willd.) Essential Oil Stick Balsam Formula] Ernestine Arianditha Pranasti; Ayuningtyas, Nurista Dida; Pramitaningastuti, Anastasia S.; Cahaya, Gabriella Lisye
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 9 No. 1 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10387

Abstract

High occurrence of muscle pain has encouraged the development of practical natural solutions, such as stick balm formulated with galangal (Alpinia galanga) essential oil, which shows potential as a topical analgesic agent. This study formulated galangal stick balm to relieve muscle pain while meeting physical requirements and user preferences. The formulation involved variations in base composition (solid paraffin and white petrolatum) and methyl salicylate concentration to evaluate physical characteristics such as pH, homogeneity, melting point, and irritation potential. A hedonic test was conducted to determine the most preferred formula. Results showed that all formulas had safe pH levels (4.5–6.5), good homogeneity, melting points between 57–60°C, and caused no skin irritation in volunteers. Hedonic testing identified Formula F4 as the best candidate based on aroma, warmth, and texture. Therefore, galangal essential oil stick balm has promising potential to be developed as a safe, stable, and user-friendly analgesic topical preparation. Bahasa Indonesia Abstract: Tingginya kasus nyeri otot mendorong pengembangan solusi alami yang praktis, seperti balsam stik berbahan minyak atsiri lengkuas (Alpinia galanga), yang memiliki potensi sebagai agen analgetik topikal. Penelitian ini merumuskan formulasi balsam stik lengkuas untuk meredakan nyeri otot yang memenuhi syarat fisik dan disukai. Formulasi dilakukan dengan variasi komposisi basis (paraffin solid dan vaselin album) dan variasi metil salisilat untuk mengevaluasi karakteristik fisik seperti pH, homogenitas, titik lebur, dan potensi iritasi. Uji kesukaan dilakukan untuk melihat formula mana yang paling disukai. Hasil menunjukkan bahwa seluruh formula memiliki pH dalam rentang aman (4,5–6,5), homogenitas yang baik, titik lebur antara 57–60°C, serta tidak menimbulkan iritasi pada kulit sukarelawan. Uji kesukaan menunjukkan Formula F4 sebagai kandidat terbaik berdasarkan aroma, kehangatan, dan tekstur. Dengan demikian, balsam stik minyak atsiri lengkuas berpotensi dikembangkan sebagai sediaan antinyeri yang aman, stabil, dan disukai pengguna.
Pengaruh Penambahan Ekstrak Kulit Buah Naga terhadap Karakteristik Fisikokimia, Aktivitas Antioksidan, dan Sensori Permen Jeli Glukomanan Konjak : [The Impact of Dragon Fruit Peel Extract Addition on The Physicochemical Properties, Antioxidant Activity, and Sensory Attributes of Konjac Glucomannan Jelly Candy] Amrinola, Wiwit; Sekarningrum, Hanandhiya
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 9 No. 1 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10389

Abstract

Dragon fruit peel is an agro-industrial by-product rich in bioactive compounds such as flavonoids, anthocyanins, phenolics, thiamine, pyridoxine, cobalamin, and carotene, which exert various physiological health effects. This study aimed to evaluate the effect of dragon fruit peel extract on the physical, chemical, functional, and sensory characteristics of konjac glucomannan-based jelly candy. The research was conducted in two stages: (1) extraction and characterization of dragon fruit peel extract, and (2) formulation of jelly candy with four extract concentrations, namely T0 (0%), T1 (9%), T2 (10%), and T3 (11%). Data were analyzed using ANOVA followed by Duncan’s multiple range test. The extract contained alkaloids, flavonoids, tannins, and steroids, with total anthocyanin content of 77.57 mg/L and antioxidant activity of 46.3%. The best formulation was obtained at T3 (11%), which exhibited total anthocyanins of 27.55 mg/L, antioxidant activity (IC50) of  98.44 ppm, total dissolved solids of 60.63 0brix, hardness of 2.31 N, L* is -46,40, a* is 30,81, b* is 14,80, c* is 32,19, H* is 9,35, and an overall sensory acceptance score of 4.68 (neutral–like). The addition of up to 11% dragon fruit peel extract enhanced antioxidant activity of the jelly candy without negatively affecting consumer acceptance. Bahasa Indonesia Abstract: Kulit buah naga merupakan hasil samping yang kaya akan senyawa bioaktif seperti flavonoid, antosianin, fenolik, tiamin, piridoksin, kobalamin, dan karoten yang memiliki efek fisiologis bagi kesehatan. Penelitian ini bertujuan untuk mengetahui pengaruh ekstrak kulit buah naga terhadap karakteristik fisik, kimia, fungsional, dan sensori permen jeli berbasis glukomanan konjak. Penelitian terdiri atas dua tahap, tahap 1 adalah ekstraksi dan karakterisasi ekstrak kulit buah naga, dan tahap 2 adalah formulasi permen jeli dengan empat perlakuan konsentrasi ekstrak kulit buah naga: T0 (0%), T1 (9%), T2 (10%), dan T3 (11%). Analisis yang dilakukan meliputi analisis fisik, analisis kimia, analisis fungsional, dan analisis sensori. Data dianalisis menggunakan ANOVA dan uji lanjut Duncan. Hasil penelitian menunjukkan bahwa ekstrak kulit buah naga mengandung alkaloid, flavonoid, tanin, dan steroid, dengan total antosianin 77,57 mg/L dan aktivitas antioksidan 46,3%. Formula terbaik diperoleh pada perlakuan T3 (11%) dengan total antosianin 27,55 mg/L, aktivitas antioksidan 38,28%, total gula 60,63%, kekerasan 2,31 N, L* sebesar -46,40, a* sebesar 30,81, b* sebesar 14,80, c* sebesar 32,19 dan H* sebesar 9,35, dan nilai penerimaan sensori keseluruhan 4,68 (kategori netral–suka). Penambahan ekstrak kulit buah naga hingga 11% meningkatkan kandungan senyawa bioaktif dan aktivitas antioksidan tanpa menurunkan penerimaan konsumen.
DMAIC Based Approach for Analyzing and Controllling Defective Product in Rubber Clutch Damper Product: [DMAIC Based Approach for Analyzing and Controllling Defective Product in Rubber Clutch Damper Product] Nata, Christopher; Tandika, Tegar; Rahayu, Priskila Christine
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 9 No. 1 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10393

Abstract

Rejects represent a major quality issue in the production process. If not effectively mitigated, they can increase production costs, disrupt process flow, and reduce customer satisfaction. This study aimed to minimize product rejection in rubber clutch damper manufacturing by applying the Six Sigma DMAIC (Define, Measure, Analyze, Improve, Control) methodology. In the Define phase, Critical to Quality (CTQ) characteristics were identified to determine key improvement priorities. The Measure phase involved data collection to calculate Defects per Million Opportunities (DPMO), sigma level, and the construction of a Pareto chart to highlight the dominant sources of defects. Subsequently, the Analyze phase employed Failure Mode and Effects Analysis (FMEA) to evaluate the Severity, Occurrence, and Detection of potential failures, leading to the determination of the Risk Priority Number (RPN) as a basis for improvement prioritization. In the Improve phase, corrective actions targeting the highest RPN factors were implemented, followed by the Control phase, which established sustainability through One Point Lessons and Standard Operating Procedures (SOPs). The implementation of the DMAIC framework resulted in a substantial improvement in process capability, indicated by an increase in sigma level from 4.11 to 4.58, and a reduction in the total production rejection rate from 1.51% to 0.31%. A paired t-test confirmed a statistically significant difference between pre- and post-improvement rejection rates (t = 61.63, p < 0.0001), leading to the rejection of the null hypothesis. These findings demonstrate that the applied improvements effectively reduced product defects and achieved a total rejection rate below the company’s management target of 0.40%. The study confirms the effectiveness of the DMAIC approach in enhancing product quality and operational efficiency within rubber component manufacturing. Bahasa Indonesia Abstract: Permasalahan reject merupakan salah satu isu krusial dalam proses produksi yang apabila tidak segera ditangani, dapat berdampak pada peningkatan biaya produksi, keterlambatan pengiriman antarproses, serta penurunan tingkat kepuasan pelanggan. Penelitian ini bertujuan untuk menurunkan tingkat reject pada produk rubber clutch damper melalui penerapan metodologi Six Sigma dengan pendekatan DMAIC (Define, Measure, Analyze, Improve, Control). Pada tahap Define, dilakukan identifikasi Critical to Quality (CTQ) untuk menentukan karakteristik yang berpengaruh signifikan terhadap kualitas produk. Tahap Measure meliputi pengumpulan data produksi guna menghitung nilai Defects Per Million Opportunities (DPMO), tingkat sigma, serta penyusunan diagram Pareto untuk mengidentifikasi jenis cacat dengan kontribusi terbesar terhadap total reject. Selanjutnya, tahap Analyze dilaksanakan menggunakan metode Failure Mode and Effects Analysis (FMEA) dengan penilaian terhadap parameter Severity, Occurrence, dan Detection, yang dikalikan untuk memperoleh nilai Risk Priority Number (RPN) sebagai dasar prioritas tindakan perbaikan. Tahap Improve difokuskan pada penerapan solusi korektif terhadap faktor penyebab dengan nilai RPN tertinggi, sedangkan tahap Control menitikberatkan pada keberlanjutan hasil perbaikan melalui penyusunan One Point Lessons (OPL) dan Standard Operating Procedures (SOP). Penerapan metodologi DMAIC menghasilkan peningkatan kapabilitas proses dengan kenaikan nilai sigma dari 4,11 menjadi 4,58, serta penurunan rejection rate total produksi dari 1,51% menjadi 0,31%. Hasil uji paired t-test menunjukkan perbedaan yang signifikan antara tingkat rejection rate sebelum dan sesudah perbaikan (t = 61,63; p < 0,0001), sehingga hipotesis nol ditolak. Dengan demikian, penerapan DMAIC terbukti efektif dalam menurunkan tingkat reject secara signifikan hingga di bawah target manajemen sebesar 0,40%, sekaligus meningkatkan kualitas produk dan efisiensi proses produksi.
High-Reliability Teams at Sea: The Role of Psychological Safety, Human–System Interaction, and Workload in Error Reporting Behavior among Offshore Workers Gomargana, Chrysan; Wibowo, Kevin Aprilio; Widjajakusuma, Jack
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 9 No. 1 (2025): NOVEMBER
Publisher : Universitas Pelita Harapan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19166/jstfast.v9i2.10416

Abstract

Offshore oil and gas operations demand high reliability under extreme physical and psychological conditions. Despite robust engineering systems, many accidents still stem from human and organizational factors. This study examines the role of psychological safety, human–system interaction, and workload in predicting error reporting behavior among offshore workers. A quantitative, cross-sectional design was applied using validated self-report scales: the Psychological Safety Scale (Edmondson), System Usability Scale (SUS), NASA Task Load Index (NASA-TLX), and an adapted Error Reporting Behavior Scale. Data were collected from 188 offshore workers in Indonesia through online questionnaires. Multiple linear regression analysis revealed that psychological safety (β = .38, p < .001) and human–system interaction (β = .27, p < .001) significantly and positively predicted error reporting behavior, while workload showed a significant negative effect (β = −.23, p < .001). The model accounted for 36% of the variance in error reporting (R² = .36). These findings indicate that workers are more likely to report errors when they feel safe to speak up, perceive systems as user-friendly, and experience manageable workloads. The study highlights the need for integrated interventions that simultaneously foster psychological safety, ergonomic system design, and balanced workload management to enhance proactive safety behavior in offshore environments. This research contributes to the intersection of industrial–organizational psychology and human factors engineering, emphasizing that safety performance in high-reliability organizations relies on both social and technological resilience. These findings align with Sustainable Development Goal 9 (Industry, Innovation and Infrastructure), reinforcing that resilient and sustainable industrial systems require the integration of human factors into safety management and system design.
Alat Peraga Kendali Pemanas Udara Berbasis Arduino Uno Sebagai Penunjang Praktikum Laboratorium Kendali Politeknik Negeri Semarang [A Demonstration Tool of Arduino Based Air Heater Controller to Support Control Laboratory of Politeknik Negeri Semarang] Supriyo, Bambang; Kuntardjo, Samuel Beta; Sihono, Sihono
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 1 No. 1 (2017): NOVEMBER
Publisher : Universitas Pelita Harapan

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Abstract

The objective of this research is to develop and test the demonstration tool of Arduino based air heater controller with Proportional Integral Derivative (PID) based control methods for the temperature range between 50ºC and 70ºC.   Arduino Uno was programmed using C-language to do control tasks and to transfer control data serially to computer via USB port. The selection of the initial PID  parameters are determined using the combination of Relay Feedback method and Ziegler-Nichols  formula.  The control methods were focused on proportional (P), proportional derivative (PD) dan Proportional Integral Derivative (PID) with the performance criteria based on overshoot  dan steady state error.  The experimental results show that the PID controllers give best output responses in terms of zero steady state errors, while P and PD controllers still result in steady state errors of about 3ºC. In addition, P controllers still give about 2,5ºC-4ºC fluctuative output values below set points, while the PD and PID have very small fluctuative values and even very close to zero. This laboratory demonstration tool has shown very good PID based controller performance, so it is feasible to be used as a supporting demonstration tool for control system laboratory in Politeknik Negeri Semarang or even other universities.
Prediksi Lendutan Akibat Bond Slip Pada Dinding Beton Bertulang [Prediction of Deflection Due to Bond Slip on Reinforced Concrete Walls] Bali, Ika; Sadikin, Sadikin
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 1 No. 1 (2017): NOVEMBER
Publisher : Universitas Pelita Harapan

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Abstract

Deflection occurs on reinforced concrete wall when it reaches the ultimate strength can be contributed by the deflection due to bending, shear and bond slip. The bond slip occurs when the loss of bond between concrete and steel reinforcement, causing the stress distribution becomes disturbed. This generates an additional deflection on the walls of reinforced concrete. This analysis study was conducted to predict the additional deflection due to the bond slip on reinforced concrete walls that were subjected to lateral load at the ultimate strength condition of the walls. The deflection due to bond slip at the ultimate strength condition of the walls is estimated by the strength-of-material concept. The wall ultimate strength is determined as the minimum of flexural and shear strengths that based on a strength-of-material concept, and the shear strength and the Softened strut-and-tie model, respectively. The specimens of reinforced concrete walls used in this study are the reinforced concrete walls with a single curvature that available in the literature. The results of this study indicated that the deflection due to bond slip provides the additional deflection average of 5.5% of the total deflection due to bending and shear as the wall reaches the ultimate strength. This study shows that the effect of deflection due to bond slip is smaller than the deflection due to shear and bending.BAHASA INDONESIA ABSTRAK: Lendutan terjadi pada dinding beton bertulang saat mencapai kekuatan batas dapat dikontribusikan oleh lendutan akibat lentur, geser dan bond slip. Bond slip terjadi ketika hilangnya ikatan antara beton dan baja tulangan, menyebabkan distribusi tegangan menjadi terganggu. Hal ini menghasilkan lendutan tambahan pada dinding beton bertulang. Studi analisis ini dilakukan untuk memprediksi lendutan tambahan akibat bond slip pada dinding beton bertulang yang mengalami beban lateral pada kondisi kekuatan batas dinding. Lendutan akibat bond slip pada kondisi kekuatan batas dinding diestimasi dengan konsep kekuatan material. Kekuatan batas dinding ditentukan berdasarkan minimum dari kekuatan lentur dan geser yang berturut-turut didasarkan pada konsep kekuatan material dan model Softened strut-and-tie. Spesimen dari dinding beton bertulang yang digunakan dalam penelitian ini adalah dinding beton bertulang dengan kelengkungan tunggal yang tersedia dalam literatur. Hasil penelitian ini menunjukkan bahwa lendutan akibat bond slip memberikan rata-rata lendutan tambahan 5,5% dari total lendutan akibat lentur dan geser saat dinding mencapai kekuatan batas. Studi ini menunjukkan bahwa pengaruh lendutan akibat bond slip lebih kecil dari pada lendutan akibat geser dan lentur.
EFEK PEMBERIAN TEMULAWAK TERHADAP BERAT BADAN DAN SISTEM IMUN MENCIT BALB/c Lucy, Jap; Florencia, Lulu; Elvina, Elvina; Stefani, Dina; Susanti, Agustina Ika
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 1 No. 1 (2017): NOVEMBER
Publisher : Universitas Pelita Harapan

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Abstract

ABSTRACT.   Curcuma (Curcuma xanthorrihiza) is a well-known Indonesian traditional medicine. It is believed to be beneficial for health. Curcuma xanthorrihiza contain curcuminoid, starch and essential oil. This herb is widely used as a traditional medicine that is packaged in the form of powders, drinks and tablets. Curcuma xanthorrihiza tablet used in the study was separated by Thin Layer Chromatography (TLC) which exhibit the compound's content to be similar to pure curcuma. This study was followed by feeding BALB/c mice with curcuma tablet on different doses (100 mg / kg body weight (BW), 200 mg / kg, and 400 mg / kg and water as a control. The effect of various doses of Curcuma xanthorrihiza on weight gain and immune response was determined. Treatment was given to BALB/c mice for 20 days on different doses and weighed once a week. Observation of body weight of mice for four weeks showed that administration of Curcuma xanthorrihiza did not affect weight gain significantly (p < 0,05). Phagocytosis test and hemagglutination test (HA) were conducted, exhibiting both pro and anti-inflammatory actions.Keywords : adaptive, curcuma xanthorrihiza, hemagglutination, innate, phagocytosis
PEMANFAATAN PATI BIJI DURIAN (Durio zibethinus L.) SEBAGAI EDIBLE COATING DALAM MEMPERTAHANKAN MUTU ANGGUR MERAH (Vitis vinifera L.) Cornelia, Melanie; Tandoko, Rika
FaST - Jurnal Sains dan Teknologi (Journal of Science and Technology) Vol. 1 No. 1 (2017): NOVEMBER
Publisher : Universitas Pelita Harapan

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Abstract

ABSTRACT.   Red grape fruit (Vitis vinifera L.) was one of non-climacteric fruit that easily damaged. Changes that occurred in damaged grape was becoming wrinkle and wither, browning, and fruit flesh softening. Durian seed was one of food waste that contains high enough starch so it could be used as a basic ingredient for making edible coating. The objectives of this research were to make edible film from durian seed starch with different concentration of durian seed starch (2%, 4%, 6%, 8%, and 10%) and glycerol 3% addition.  Edible films' physical and mechanical characteristics such as tensile strength, elongation, and water vapor transmission rate were analyzed.  The best edible film will be used for coating of red grapes. Finally, doing analyzing the effect of edible coating towards quality of red grapes that were stored at room and refrigeration temperature. Physical and chemical characteristic of red grapes such as skin puncture, weight loss, pH, total titratable acid, and total dissolved solid were analyzed during storage. The results showed that edible film with the higher concentration of durian seed starch had higher tensile strength, elongation, and thickness, but had lower water vapor transmission rate. The best edible film was an edible film with 6% durian seed starch and 3% glycerol. The results also showed that application of the edible coating on red grapes could maintain the quality of grape during storage, prolonged the shelf life up to 18 days at room temperature and up to 30 days at refrigeration temperature.Keywords: durian seed, edible coating, physicochemical quality, red grape, shelf life

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