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Science Get Journal
Published by CV. Get Press Indonesia
ISSN : -     EISSN : 30626595     DOI :  http://doi.org/10.69855/science
Core Subject : Science, Education,
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics
A Peer Reviewed Research Science Get Journal e-ISSN: 3062-6595 Science Get Journal is an Open Access and Anonymous Reviewer/Anonymous Author journal. The field of Science is a vehicle for scientific communication in the field of Science which covers the cross-fields of Mathematics, Physics, Chemistry, Biology, Geography and Mathematics,  Natural Sciences Education and Social Sciences. Science Get Journal is published by Get Press Indonesia. Science Get Journal is used to publish research published every month January, April, July, and October. The Science Get Journal template can be downloaded here (Click). Information about article submission: Articles sent by the author (author) will be seen and read by the editor, if there are still discrepancies with the applicable template and do not comply with the scope of Science Get Journal then the article will be returned to the author. If it is appropriate, the article will be forwarded to the Science Get Journal reviewer for a review process carried out by the Science Get Journal reviewer. A total of two reviewers within a two week period of evaluating the article.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 68 Documents
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Thermoelectric Performance of Doped Polyaniline from Textile Dye Waste Eka Cahya Muliawati; Herma Syafika
Science Journal Get Press Vol 3 No 2 (2026): April, 2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i2.620

Abstract

This study investigates the thermoelectric performance of polyaniline (PANI) doped with textile dye waste, specifically methyl orange (MO) and congo red (CR), as sustainable alternative dopants. Polyaniline was synthesized via oxidative polymerization using ammonium persulfate as the oxidant at varying dopant concentrations (0.1–1.0 M), with three independent replicates per condition to ensure statistical validity. Characterization was performed using FTIR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and four-probe electrical conductivity measurements. Thermoelectric performance was evaluated through the Seebeck coefficient (S), power factor (PF = S²σ), and figure of merit (ZT). Results show that PANI-CR 0.5 M yielded the highest Seebeck coefficient of 42.7 µV/K, electrical conductivity of 127.3 S/cm, and power factor of 2.31 × 10⁻⁴ W/m·K². The ZT value obtained reached 0.434 at the optimal temperature of 340 K, a significant improvement of 340% compared to undoped PANI, substantially superior to PANI-HCl (ZT = 0.040) and competitive with organic thermoelectric materials reported in recent literature (e.g., PANI-CSA: 1.83 × 10⁻⁴ W/m·K² at 300 K). Unlike conventional approaches using synthetic dopants, this waste-to-material strategy demonstrates that textile dye waste can be valorized as functional dopants, offering dual environmental benefits: reducing water pollution (0.01–1 mg/L threshold) while producing low-cost organic thermoelectric materials. These findings highlight the potential for scaling to industrial thermoelectric devices and battery thermal management systems. Future work will explore composite materials with carbon nanostructures and optimization through polymerization condition engineering.
Utilization of Microalgae as Carbon Absorbent Material for Environmentally Friendly Concrete in Tropical Coastal Areas Risjunardi Damanik; Khadijah; Hanifah Sriamelia
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.685

Abstract

This study evaluates the mechanical, durability, and carbon sequestration performance of a 1:1 blend of Chlorella vulgaris and Spirulina platensis biomass as a supplementary cementitious material (SCM) in concrete for tropical coastal infrastructure. Five replacement levels (0%, 3%, 5%, 7%, and 10% by weight of cement) were tested under ambient tropical conditions (28–32°C, 75–85% RH) reflecting West Sumatra's coastal environment. Compressive and flexural strength, water absorption, chloride penetration resistance, and CO₂ sequestration via thermogravimetric analysis were comprehensively assessed. Results indicate that 5% replacement (MA-5) achieved the optimal balance: 28-day compressive strength of 31.4 MPa (6.4% below control), while demonstrating 12.3% improved chloride resistance and a net carbon sequestration rate of 38.7 kg CO₂/m³ of concrete. Scanning electron microscopy confirmed microalgae cell-wall fragments filling interfacial transition zones, reducing porosity by 11.2% and enhancing matrix densification. The findings demonstrate that microalgae-incorporated concrete at 5% OPC replacement is a technically viable, low-carbon alternative for coastal tropical construction, offering both structural adequacy and environmental benefits. Adoption in Indonesia's green building programs is recommended, with future research needed to validate performance at industrial scale and assess long-term durability under field marine exposure.
Enhancing the Mechanical and Barrier Properties of Seaweed-Cassava Starch Bioplastics with Natural Additives for Sustainable Food Packaging Etin Diah Permanasari; Larisa Mandalini
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.731

Abstract

The growing accumulation of petroleum-based plastic waste has intensified the search for biodegradable alternatives from renewable resources. This study investigated the effect of clove essential oil (CEO) on the mechanical and barrier properties of composite bioplastic films from semi-refined carrageenan and cassava starch (30:70) with 30% glycerol. Unlike previous studies using purified biopolymers or focusing solely on antimicrobial effects, this work uniquely evaluates CEO as a dual-function agent plasticizer and hydrophobic barrier enhancer within a low-cost carrageenan–starch matrix to identify the optimal loading for balanced packaging performance. Films were prepared by solution-casting with CEO at 0, 0.5, 1.0, 1.5, and 2.0% (w/w). Increasing CEO content decreased tensile strength (18.2 to 12.1 MPa) and Young's modulus (612 to 365 MPa), while elongation increased (22.4% to 41.6%). WVP and oxygen permeability decreased by 39% and 43%, respectively, alongside an increase in contact angle (68.4° to 89.6°), indicating enhanced hydrophobicity. FTIR confirmed physical dispersion without new covalent bonding. Films remained biodegradable, though higher CEO slowed degradation. The 1.0–1.5% CEO formulation offered the most balanced combination of flexibility, barrier performance, and degradability for sustainable food packaging.
The Effect of Blue Light Exposure on Sleep Quality and Student Productivity in the Digital Learning Era Diana Chandra Dewi; Yuli Hardina
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.686

Abstract

The proliferation of digital learning platforms has substantially increased student screen time, raising concerns about blue light (415–455 nm) exposure and its effects on sleep quality and cognitive productivity. This cross-sectional study examined 216 undergraduate students from three Javanese public universities (2023–2024). Blue light exposure was quantified using lux-meter spectrophotometry; sleep quality via the Pittsburgh Sleep Quality Index (PSQI); and productivity through Grade Point Average (GPA), Perceived Productivity Scale (PPS), and cognitive tests (Trail Making Test A/B, digit span). Regression and mediation analyses were performed. Students with ≥3 hours nightly pre-sleep blue light exposure had significantly poorer PSQI scores (8.6±1.8 vs. 4.1±1.2; p<0.001) and 18.3% lower academic productivity scores. Sleep quality partially mediated the blue light–productivity relationship (β=-0.41, 95% CI: -0.54 to -0.28). Use of blue light-filtering glasses and Night Mode significantly attenuated these effects (p=0.012). These findings provide empirical evidence for evidence-based digital wellness policies in Indonesian higher education.
Development of Biodegradable Food Packaging from Seaweed and Cassava Starch as an Alternative to Single-Use Plastic Almira Ulimaz; Lovi Sandra
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.687

Abstract

The accumulation of single-use plastic packaging threatens ecosystems and human health, with Indonesia ranking as the world's second-largest marine plastic polluter. Biopolymer-based packaging from renewable resources offers a sustainable alternative, yet optimization of locally available Indonesian feedstocks under tropical conditions remains limited. This study developed biodegradable films from Eucheuma cottonii κ-carrageenan and cassava starch across seven formulations (F1–F7) varying the carrageenan-to-starch ratio (10:0 to 0:10 w/w). Physical, mechanical, barrier, thermal, morphological, biodegradation, and food safety properties were evaluated according to ASTM, ISO, SNI, and EU standards. Formulation F4 (5:5 ratio) achieved optimal balance, yielding tensile strength of 18.74 MPa, elongation at break of 32.16%, water vapor transmission rate of 126.8 g/m²·day, oxygen transmission rate of 42.3 cm³/m²·day·atm, and 94.7% biodegradation within 30 days under tropical composting conditions. FTIR confirmed intermolecular hydrogen bonding between carrageenan sulfate and starch hydroxyl groups, while DSC revealed a single thermal transition (71.4°C), confirming polymer miscibility. SEM demonstrated homogeneous, crack-free microstructure. Food safety testing confirmed compliance with SNI and EU migration limits, establishing regulatory readiness. This composite bioplastic, leveraging Indonesia's abundant seaweed and cassava resources, holds strong potential as a commercially viable, eco-friendly alternative to conventional single-use plastic food packaging.
Powerful Biochar: Agricultural Waste for Soil Stabilization in Landslide-Prone Areas Nani Kitti Sihaloho; Sariwahyuni
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.709

Abstract

Rainfall-induced landslides on residual soil slopes remain a persistent geohazard in tropical mountainous regions, and conventional chemical stabilizers such as cement and lime raise concerns regarding cost, carbon footprint, and long-term ecological impact. This study investigates the potential of biochar produced from agricultural waste (rice husk and corn cob) as a sustainable soil-stabilizing amendment for slope soils in a landslide-prone area of Padang City, West Sumatra, Indonesia. Biochar was produced through slow pyrolysis at 450 °C and mixed with residual soil at five proportions (0%, 5%, 10%, 15%, and 20% by dry weight). Physical and mechanical properties were evaluated through Atterberg limit tests, standard Proctor compaction, direct shear tests, and falling-head permeability tests. The results indicate that the addition of biochar up to 15% significantly increased cohesion from 18.2 kPa to 34.1 kPa and the internal friction angle from 24.3° to 31.2°, while reducing the plasticity index and the coefficient of permeability. Beyond 15%, mechanical performance declined, indicating an optimum biochar content. These findings suggest that agricultural-waste-derived biochar can serve as an environmentally friendly and cost-effective soil amendment to improve slope stability, offering a dual benefit of agricultural waste management and landslide mitigation.
Road Damage Prediction via Smartphone: Optimizing Vibration Sensors and Crowdsourced Data for Low-Cost Pavement Condition Assessment Mila Sari; Rozlinda Dewi
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.710

Abstract

Road authorities in developing countries lack cost-effective pavement monitoring tools. This study optimizes smartphone vibration sensing and crowdsourced data for automatic road damage prediction. Accelerometer and GPS data were collected from motorcycles on 42 urban road segments (86.4 km) in Padang, Indonesia, producing 12,480 labelled windows across four pavement condition classes. Four machine-learning classifiers were trained and compared: SVM, ANN, XGBoost, and Random Forest (RF). Sampling rate, mounting position, and contributor aggregation effects were systematically evaluated. RF achieved the highest performance (92.4% accuracy, 91.4% F1-score). A 50 Hz sampling rate with dashboard mounting provided optimal results, while pocket mounting degraded accuracy substantially. Aggregating data from five or more contributors reduced IRI estimation RMSE from 2.31 to 1.21 m/km, with strong correlation to ground-truth measurements (r = 0.91). Optimized smartphone sensing offers a scalable, low-cost alternative for pavement assessment in resource-constrained regions, supporting evidence-based maintenance prioritization.
Local Plastic-Eating Bacteria: The Key to Bioremediation in Indonesian Coastal Waters Kun Mardiwati Rahayu; Yuli Hardina
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.712

Abstract

Marine plastic pollution is a critical environmental problem in Indonesian coastal waters, where inadequate waste management and high population density contribute substantially to plastic leakage into the marine environment. Indigenous plastic-degrading bacteria offer a potentially low-cost bioremediation strategy, yet locally isolated strains remain poorly characterized. This study aimed to isolate, screen, and molecularly identify indigenous bacteria capable of degrading polyethylene terephthalate (PET) and low-density polyethylene (LDPE) from seawater, sediment, and plastic-debris samples collected at three stations in Bungus Bay, Padang City, West Sumatra. From 42 morphologically distinct colonies, five isolates with the largest clear zones were selected and identified through 16S rRNA gene sequencing as strains related to Bacillus cereus, Pseudomonas aeruginosa, Rhodococcus ruber, Achromobacter xylosoxidans, and Bacillus subtilis. Quantitative degradation assays conducted in triplicate over 90 days showed that a three-isolate consortium achieved the highest weight loss of PET (16.3%) and LDPE (11.2%), significantly exceeding single-isolate treatments and abiotic controls (ANOVA, Duncan’s test, p < 0.05). FTIR analysis confirmed polymer oxidation, with carbonyl indices increasing from 0.18 to 0.34 for PET and from 0.05 to 0.21 for LDPE. These findings demonstrate considerable biodegradation potential under laboratory conditions, although field validation is required before in-situ application for marine bioremediation purposes.

Page 7 of 7 | Total Record : 68

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