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INDONESIA
Techno: Jurnal Penelitian
Published by Universitas Khairun
ISSN : 1978610X     EISSN : 25807129     DOI : -
Core Subject : Science, Agriculture, Engineering,
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture
TECHNO: Jurnal Penelitian diterbitkan oleh Lembaga Penelitian dan Pengabdian Masyarakat (LPPM) Universitas Khairun, dua kali terbit dalam setahun dengan jumlah artikel dalam sekali terbit sebanyak 8 tulisan.
Arjuna Subject : -
Articles 175 Documents
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Response Surface–Based Multi-Objective Optimization of Energy Absorption and Reaction Force in Axially Impacted Thin-Walled Aluminum Alloy Tube Witono Hardi; Ambar Sulistyo Wardani; Mohammad Shalahuddin Abdul Aziz
TECHNO: JURNAL PENELITIAN Vol 15 No 1 (2026): TECHNO JURNAL PENELITIAN
Publisher : Universitas Khairun

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Abstract

Thin-walled aluminum alloy tubes are widely used as energy-absorbing elements in safety structures because they exhibit strong plastic deformation under axial impact loads. This study aims to optimize the axial impact response of aluminum alloy tubes by simultaneously maximizing absorbed impact energy and minimizing the maximum reaction force. The analysis was carried out using numerical simulation of the element method, with a fixed tube length of 50 mm and a constant impact velocity. Varied geometric parameters include tube diameter (15–20 mm) and wall thickness (0.5–1.5 mm). The experimental design was prepared using Central Composite Design (CCD) within the framework of the Response Surface Methodology (RSM). The RSM quadratic model was developed to map the relationships between geometric parameters and the responses of absorbed energy and maximum reaction force. The simulation results show a clear trade-off between the two responses: an increase in absorbed energy is accompanied by an increase in the reaction force. Multi-response optimization is performed using a desirability function approach with equal weights for both responses. The optimization results showed that the optimal design was achieved at a diameter of about 19 mm and a thickness of about 1.1 mm, yielding high absorbed energy with relatively low reaction forces. The methodology and results of this study provide a systematic basis for the design of energy-absorbing elements using aluminum alloy tubes for crashworthiness applications.
Morphological Superiority of Candidate Upright Bird’s Eye Chili Varieties (Capsicum frutescens L.) in Lowlands Aliana Fajriyah; Annisa Khoiriyah; Agus Wartapa
TECHNO: JURNAL PENELITIAN Vol 15 No 1 (2026): TECHNO JURNAL PENELITIAN
Publisher : Universitas Khairun

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Abstract

Bird’s eye chili (Capsicum frutescens L.) is one of the most popular chili types in Indonesia. It contains valuable nutritional components, particularly vitamin C at a concentration of 11 mg per 10 grams of sample. The development of new varieties is undertaken to improve the genetic quality of chili plants, thereby producing cultivars with higher productivity and more stable yields. This study aims to obtain the morphological characteristics and specific distinguishing features of the bird’s eye chili candidate variety RTJHL. The research was conducted using a Randomized Complete Block Design (RCBD) with one factor consisting of four variety treatments. These varieties included RTJHL as the candidate test variety, and three comparison varieties: Abayomi from Halbanero, O’Ertavi from Halbanero, and Brengos-99 from Benih Kelud Nusantara. Morphological traits were analysed descriptively based on the Guidelines for Conducting Tests of Distinctness, Uniformity, and Stability (DUS) in chili. The result revealed that superior traits identified as distinguishing characteristics of the bird’s eye chili candidate variety RTJHL were the number of flower petals and the number of fruit locules.
Performance Evaluation of the Karl Fischer Method for Determining Water Content in Food Products Ardina Purnama Tirta; Imas Solihat; Regy Reynaldi; Achmad Nandang Roziafanto
TECHNO: JURNAL PENELITIAN Vol 15 No 1 (2026): TECHNO JURNAL PENELITIAN
Publisher : Universitas Khairun

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Abstract

Water content is a crucial parameter in determining the quality of food products, as it influences physicochemical properties, microbial growth, and shelf life. Therefore, reliable methods for water content determination are essential. This study evaluated the performance of the Karl Fischer method through several parameters: linearity, limit of detection (LOD), limit of quantitation (LOQ), precision, accuracy, and measurement uncertainty. The method showed strong linearity with the regression equation y = 0.9719x + 0.5062 and a correlation coefficient (r) of 0.9998 across 1.0–10.0% water concentration. The LOD and LOQ were found to be 0.10% and 0.13%, respectively. Precision (%RSD) at 5, 60, and 100% water concentrations yielded values of 0.88, 0.26, and 0.09%. Accuracy (% trueness) ranged from 92% to 105%, while the mean relative uncertainty was 6%. These results demonstrate that the Karl Fischer method offers acceptable performance and is suitable for accurate water content determination in food products.
Atomic Charge Reveals Global Electron Redistribution in Substituted Benzene: A Semiempirical Quantum Study Annisha Noor Dienna; Maula Nabila Alika Fitri; Novalia Nurbaiti; Prisca Caesa Moneteringtyas; Keysia Claudia Sagala
TECHNO: JURNAL PENELITIAN Vol 15 No 1 (2026): TECHNO JURNAL PENELITIAN
Publisher : Universitas Khairun

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Abstract

This study investigates the electronic influence of electron-donating substituents on the C₀ of substituted benzene systems using a computational chemistry approach. Aromatic systems exhibit complex electron density redistribution governed by π-electron delocalization, where substituent effects propagate across the entire ring rather than remaining localized. To systematically evaluate this behavior, eleven benzene derivatives representing alkyl, amino, and oxygen-containing substituents were modeled and analyzed using the semiempirical AM1 method implemented in ORCA. Atomic charge variations at the C₀ position were calculated relative to benzene and examined using both Mulliken and Löwdin population analyses to ensure methodological consistency. The results reveal that electron-donating groups do not necessarily increase electron density locally at the C₀; instead, the donated electron density is redistributed throughout the aromatic π-system. Alkyl substituents show minimal charge variation, indicating weak inductive effects, while amino groups exhibit moderate influence through resonance interactions without significant localization at C₀. Oxygen-containing substituents, particularly phenol and alkoxy derivatives, demonstrate stronger electronic perturbations due to effective lone-pair resonance donation. Notably, ethoxybenzene displays anomalous behavior, suggesting a combined influence of resonance and additional inductive contributions from its alkyl chain. Despite differences in absolute values, both population analysis methods produce consistent trends, supporting the robustness of the findings. Overall, this study highlights that ΔC₀ serves as an indicator of global electron redistribution rather than localized charge accumulation, providing a more physically meaningful interpretation of substituent effects in aromatic systems
Improving Tour Package Quotation Efficiency Utilizing The Roundup Function in Microsoft Excel Muhamad Ari Perdana; Ayu Wanda Febrian
TECHNO: JURNAL PENELITIAN Vol 15 No 1 (2026): TECHNO JURNAL PENELITIAN
Publisher : Universitas Khairun

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Abstract

Accurate and efficient tour package quotation or price calculation is one of the key factors in supporting the competitiveness of the travel and tourism industry. Manual calculation processes, which are still widely used in the education and in the travel industries are often time-consuming, prone to errors, and difficult to modify when there are changes in cost components and the number of tourists. This study aims to improve an efficient method for calculating tour package quotations through the utilization of the ROUNDUP function in Microsoft Excel. The method employed in this study is Research and Development (R&D) using the ADDIE model, which consists of the stages of Analysis, Design, Development, Implementation, and Evaluation. The results of the study indicate that the Excel template based on the ROUNDUP function is capable of simplifying formula structures by up to 60% compared to manual methods, making them easier to modify and reducing calculation processing time. Two Experts validation yielded a score of 90%, categorized as highly feasible. The implementation of this template has proven effective in improving efficiency for accelerating the pricing preparation process and minimizing the risk of pricing calculation errors. Therefore, this tour package quotation template utilizing the round up function can serve as a practical solution for enhancing education and work productivity in the travel and tourism industry.

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