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G-Tech : Jurnal Teknologi Terapan
Published by Universitas Islam Raden Rahmat Malang
ISSN : 25808737     EISSN : 2623064X     DOI : -
Core Subject : Science, Engineering,
Computer Science & IT Decision Sciences, Operations Research & Management Energy Engineering
Jurnal G-Tech bertujuan untuk mempublikasikan hasil penelitian asli dan review hasil penelitian tentang teknologi dan terapan pada ruang lingkup keteknikan meliputi teknik mesin, teknik elektro, teknik informatika, sistem informasi, agroteknologi, dll.
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 999 Documents
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Performance Evaluation of LPG-Fueled Rotary Dryer with Forced Convection for Paddy Post-Harvest Processing Ida Bagus Alit; I Made Mara
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10798

Abstract

Traditional post-harvest draying is often weather-dependent and produces low quality rice, so efficient mechanical technologies are needed for small scale farmers. This study evaluated the performance of an innovative, liquefied petroleum gas (LPG)-fueled rotary dryer engineered for post-harvest paddy processing for small-scale farmers. The system employed an indirect heating mechanism combined with forced convection at an airflow velocity of 2 m/s. Experimental trials were conducted across three drying temperatures: 45°C, 55°C, and 65°C. The results demonstrated that the LPG heating system provided high thermal stability and achieved a robust equilibrium within 30 to 40 minutes. Elevating the operating temperature significantly accelerated moisture diffusion, reducing the drying duration from 180 minutes at 45°C to 120 minutes at 65°C. Although the 65°C treatment achieved the highest initial energy efficiency, it induced severe hygroscopic stresses that dropped the head rice yield (HRY) to 60.7%. Conversely, the 55°C treatment emerged as the optimal operating condition, successfully balancing drying kinetics with grain physical integrity by yielding the highest HRY of 70.2% within 150 minutes. Further research is needed to integrate automatic temperature control systems, as well as an analysis of the economic feasibility of using LPG on a farmer scale.
Integration of Visual Branding and User Experience in the Design of the Nusantara Rempah Marketplace Application Rossyta Wahyutiar; Alexander Wirapraja; Jocelyn Leslie Santoso Go
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10824

Abstract

Indonesia has significant potential as one of the world's leading spice producers; however, digital platforms that integrate spice marketing and education remain limited. This study aims to design Rempahara, a spice marketplace application that integrates visual branding and user experience to improve digital transactions while providing educational content on Indonesian spices. The study employed the Design Thinking method, consisting of the Empathize, Define, Ideate, Prototype, and Test stages. A high-fidelity prototype was evaluated through usability testing involving 30 respondents selected using purposive sampling, comprising users familiar with marketplace applications and interested in cooking or spice products. The evaluation used Task Success Rate, Error Rate, and Time on Task metrics. The results showed a Task Success Rate of 97.1%, an Error Rate of 2.9%, and an Average Completion Time of 26.6 seconds. According to usability effectiveness criteria proposed by ISO 9241-11 and Nielsen's usability principles, these results indicate that the application demonstrates high usability, enabling users to complete tasks effectively and efficiently. Therefore, integrating visual branding and user experience can provide an intuitive and informative digital marketplace for Indonesian spices.
Impact of Industrial Activities on Buduran River Water Quality in Sidoarjo Regency Using The STORET Method Listin Fitrianah; Heni Lestari
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10857

Abstract

The Buduran River in Sidoarjo Regency is a water source used by the community for domestic, agricultural, and fishery purposes. Increasing industrial and residential activities along the river have raised concerns about water pollution, particularly by organic matter and heavy metals. This study aims to analyze the water quality status of the Buduran River based on physicochemical parameters using the STORET method. Water samples were taken from two locations with two repetitions, a total of 8 samples, and tested for temperature, pH, BOD, COD, and the heavy metal Pb. The results showed that temperature and pH were in accordance with the Class II quality standards of the Republic of Indonesia Government Regulation Number 22 of 2021. The levels of BOD, COD, and the heavy metal Pb exceeded the established threshold. The BOD parameter at location points 1 and 2, namely 12.3 mg/L and 20.1 mg/L, respectively, exceeded the quality standard limit of 3 mg/L. The COD parameter at the second location point exceeded the quality standard limit of 29 mg/L because it was above 25 mg/L. The Pb metal parameter at location 1 was 1.63 and the second location was 1.22 mg/L. Both exceeded the quality standard limit. This indicates that the river in Buduran is experiencing water pollution. The role of the government and industrial managers in managing rivers due to industrial activities in mentoring and implementing technology.The scoring calculation using the STORET method showed that the water quality status of the Buduran River in Sidoarjo was moderately polluted at all points, with a score of -12 at locations 1 and 2 and a score of -18. These findings indicate the need for better waste management to maintain the sustainability of the river ecosystem.
Formulation and Application of EcoPlast Paving Block Based on LDPE Plastic Waste as Sustainable Construction Material for Pesantren Infrastructure Ataya Syahira; Arina Zakyatul Putri; Fahmi Waladul Hafidz Al Huda; Vicky Wildan Yustisia
G-Tech: Jurnal Teknologi Terapan Vol 10 No 3 (2026): G-Tech, Vol. 10 No. 3 July 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/g-tech.v10i3.10898

Abstract

Indonesia generates an estimated 38.6 million tons of solid waste annually, with Low-Density Polyethylene (LDPE) forming a persistent fraction of plastic debris because it degrades extremely slowly in the environment. This study explores EcoPlast Paving Block, a cement-free paving element manufactured from shredded LDPE waste and natural sand, designed for the practical needs of Islamic boarding school (pesantren) infrastructure. Three LDPE–sand mass ratios (70:30, 50:50, and 40:60) were investigated, each represented by three specimens (n = 9) with nominal dimensions of 20 × 10 × 6 cm. Compressive strength was measured at 28 days, using the procedure of SNI 03-0691-1996 as an equivalent performance reference. The mixes achieved average strengths of 13.40 MPa, 20.54 MPa, and 42.69 MPa for 70:30, 50:50, and 40:60 respectively, indicating a consistent increase in strength with higher sand content and placing the 40:60 composition above the Grade A threshold. Water absorption remained below 3% for all specimens. These results suggest that LDPE–sand paving blocks can offer a lightweight, durable, and waste-based alternative to conventional cement paving in pesantren courtyards and access ways.
Structural Performance Assessment of Post-Tensioned PC-U Girders for 25 m and 50 m Industrial Bridge Spans Kohar Yudoprasetyo; Muhammad Sigit Darmawan; Ifarrel Rachmanda Hariyanto; Moh. Fadhlan Rosyidi; Rishma Eka Savaringga
G-Tech: Jurnal Teknologi Terapan Vol 10 No 4 (2026): G-Tech, Vol. 10 No. 4 October 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v10i4.10869

Abstract

A 380 m industrial bridge connects the JIIPE Industrial Estate to Pulau Segitiga in Gresik, Indonesia. This study evaluates the structural performance of post-tensioned prestressed-concrete U (PC-U) girders for representative 25 m side spans and a 50 m main span using section calculations and three-dimensional SAP2000 analysis. The assessment covers prestressing demand, immediate and time-dependent losses, anchorage-induced principal tensile stress, live-load deflection, and preliminary erection feasibility. Required prestressing forces are 9,278.7 kN and 25,348.7 kN for the 25 m and 50 m girders, respectively. Total prestress losses are 26.1% and 27.6%, below the adopted 28% planning estimate. Maximum principal tensile stresses after anchorage are 2.519 MPa and 2.676 MPa, below allowable values of 2.556 MPa and 2.761 MPa. Live-load deflections are 17.10 mm and 60.35 mm, satisfying the corresponding L/800 limits of 31.25 mm and 62.50 mm. P Preliminary lifting checks indicate that the assumed half-girder lifting configurations are feasible within the adopted crane-chart capacities. Both girder configurations satisfy the structural criteria evaluated in this study under the stated assumptions; however, the 50 m girder governs the serviceability and lifting requirements, utilizing 96.6% of the allowable deflection and approximately 90% of the adopted crane-chart capacity. The lifting assessment represents only a preliminary erection-feasibility screening and does not constitute a final lifting or erection plan. Detailed anchorage-zone design, camber verification, construction-stage analysis, temporary stability assessment, field verification, and project-specific erection planning are therefore required before implementation.
Analysis of Cost Structure and Budget Plan for the Construction of the Annuqayah Islamic Boarding School Cafeteria Ahmad Lailur Rahman; Aditya Dandy Firatama; Ach Ivan Ramadhan Zeini; Abd. Hakam; Moh. Najmus Surur; Moh. Aunirrahman Halim
G-Tech: Jurnal Teknologi Terapan Vol 10 No 4 (2026): G-Tech, Vol. 10 No. 4 October 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v10i4.10943

Abstract

Accurate cost planning is essential for establishing an effective cost structure and supporting cost control in construction projects. This study aims to analyze the Cost Budget Plan (Rencana Anggaran Biaya/RAB) for the Annuqayah Islamic Boarding School Cafeteria Construction Project in Latee, Guluk-Guluk, Sumenep, with particular emphasis on the cost structure, dominant cost components, and their sensitivity to changes in project costs. A descriptive quantitative approach was employed using design drawings, work specifications, field conditions, and the 2025 Sumenep Regency Unit Price Analysis (AHSP) as the primary data sources. The analysis comprised work volume calculations, unit price determination, cost recapitulation, identification of dominant cost components, and sensitivity analysis. The results show that the total project budget is Rp2,093,465,390.82 before Value Added Tax (VAT). Steel structure work represents the largest cost component, amounting to Rp1,111,199,334.60, indicating its substantial influence on the overall project budget. Consequently, variations in steel structure costs have a greater potential to affect the total project cost than other work components. These findings indicate that cost control should prioritize dominant cost components, particularly steel structure work, through careful material cost management, quantity control, and efficient project implementation to minimize the risk of cost overruns.
Integrating Semantic Clustering-Based Recommendation Models and RAG Generative AI Chatbots for Regional Innovation Analytics Alfi Fadliana; Dea Kayla Putri Darusman; Dinda Ayu Permatasari
G-Tech: Jurnal Teknologi Terapan Vol 10 No 4 (2026): G-Tech, Vol. 10 No. 4 October 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v10i4.11030

Abstract

Regional research and innovation agencies are responsible for monitoring large volumes of innovation data submitted by local government units. Non-standardized submissions, manually matched collaboration opportunities, and a growing data request burden have left this data underutilized for policymaking. This study aimed to design, implement, and evaluate an integrated platform for regional innovation monitoring at the Regional Research and Innovation Agency (BRIDA) of East Java Province, using a design and development research approach. The platform combines a clustering based recommendation model that groups semantically similar innovations using multilingual sentence embeddings, an AI chatbot built on Retrieval-Augmented Generation (RAG) for querying the innovation database, and descriptive analytical reports on innovation maturity. Tested on 643 innovation records, the platform achieved a 100 percent functional pass rate across 35 test scenarios, while the chatbot achieved mean faithfulness and relevance scores of 4.0 out of 5.0 under an LLM as a judge evaluation. These results suggest that embedding based clustering can reveal previously hidden collaboration opportunities, while a generative chatbot can meaningfully reduce manual search workload. To the authors' knowledge, this is the first platform integrating clustering based recommendation with RAG based querying for regional innovation monitoring, offering a replicable design for similar settings.
Integrated Structural Assessment of an Industrial Port Jetty under Vessel Upgrading in Gresik Ifarrel Rachmanda Hariyanto; Raden Buyung Anugraha Affandhie; Adetiasyah Caesar Wahyugo; Kohar Yudoprasetyo; Moh. Fadhlan Rosyidi
G-Tech: Jurnal Teknologi Terapan Vol 10 No 4 (2026): G-Tech, Vol. 10 No. 4 October 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v10i4.11101

Abstract

Increasing the vessel class at an existing jetty can be governed by structural resistance, lateral pile response, marine equipment, or water depth. This study evaluates a 10,000 DWT pile-supported precast dry-bulk jetty at Industrial Port, Gresik, for 20,000, 30,000, and 40,000 DWT vessels. The assessment used project drawings, vessel particulars, bathymetry, borehole and SPT records, metocean data, finite element modelling, reinforced-concrete capacity checks, pile axial and lateral evaluation, fender and bollard screening, and a finite element method model. At 30,000 DWT, the maximum flexural demand-to-capacity ratios were 0.995 for beams, 0.624 for half slabs, and 0.967 for pile caps. The corresponding pile-head displacement and stress ratio were 98.96 mm and 0.97. At 40,000 DWT, the maximum ratios increased to 1.81, 1.10, and 1.03, while pile displacement and stress ratio reached 238.88 mm and 1.37. The largest feasible class is therefore 30,000 DWT, conditional on replacing the fender, dredging the berth pocket by about 2 m, and controlling operations. The in-situ dredging volume was 57,905 m³; with a 1.10 bulking factor, the estimated handled volume was 63,605.5 m³. The static post-dredging safety factor was 1.67.
The Effect of α-Amylase and Glucoamylase Enzyme Concentrations and Fermentation Time on the Characteristics of Bioethanol from Cempedak Seed Flour Carisha Alif Dewanty; Ngatirah Ngatirah; Erista Adisetya
G-Tech: Jurnal Teknologi Terapan Vol 10 No 4 (2026): G-Tech, Vol. 10 No. 4 October 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v10i4.11141

Abstract

Indonesia's reliance on fossil fuels highlights the need for renewable energy sources, including bioethanol derived from non-food biomass. Cempedak seeds (Artocarpus champeden sp.) represent an underutilized tropical agro-industrial waste; however, their high starch content (±71.8%) makes them a promising substrate for bioethanol production. This study aimed to examine the effects of alpha-amylase and glucoamylase enzyme concentration ratios (0.5%:1.5%, 1%:1%, and 1.5%:0.5%) and fermentation durations (2, 3, 4, and 5 days) on the characteristics of cempedak seed flour bioethanol, including total sugar content, alcohol content, moisture content, pH, and density. The study utilized a two-factor Randomized Complete Block Design (RCBD) with two replications. It was analyzed using Analysis of Variance (ANOVA), followed by Duncan's Multiple Range Test at a 5% significance level. The concentration ratio of α-amylase and glucoamylase enzymes had a significant effect on total sugar content, alcohol content, moisture content, pH value, and density. Fermentation duration had a significant effect on alcohol content, moisture content, pH, and density, but no significant effect on total sugar content. The treatment with an α-amylase-to-glucoamylase ratio of 0.5%:1.5% and a fermentation duration of 2 days produced the highest alcohol content (46%).
Life Cycle Cost Structure of a High-Rise Office Building and Its Conceptual Integration with Digital Twin Technology Ety Fitriyani; Abul Fida Ismaili; Aswin Wahyu Kurniawan; Demmy Adhi Mulya Darma; Niche Meiliasandi
G-Tech: Jurnal Teknologi Terapan Vol 10 No 4 (2026): G-Tech, Vol. 10 No. 4 October 2026
Publisher : Universitas Islam Raden Rahmat, Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.70609/gtech.v10i4.11209

Abstract

Investment decisions for building projects remain dominated by initial construction cost, while operational, maintenance, and replacement costs accumulating over decades receive limited attention. This study analyses the life cycle cost (LCC) structure of a 27,288 m² high-rise office building over a 25-year service period and examines conceptually how digital twin technology could address the limitations of conventional LCC practice. Cost data were obtained from the building management unit and projected using annual escalation rates of 12% for operational and 10% for maintenance cost under a constant-currency approach. Initial cost accounts for only 21.8% of total LCC, operational cost 46.9%, and maintenance and replacement cost 31.3%, so post-occupancy expenditure represents 78.2% of total ownership cost. Energy (24.6%) and security (24.3%) dominate operational cost, while air conditioning (25.6%) and generator sets (20.4%) dominate maintenance and replacement cost. A conceptual framework is proposed in which digital twin capabilities transform LCC from a static design-stage estimate into a continuously updated decision instrument. The framework was neither implemented nor empirically validated. Because the analysis rests on a single case and projected costs, the proportions are context-specific, although sensitivity analysis confirms the dominance of post-occupancy cost is robust.

Page 99 of 100 | Total Record : 999

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