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Tangguh Okta Wibowo
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Gedung Lengkung, Unit 1, Lantai 2, Sayap Timur Sekolah Pascasarjana Universitas Gadjah Mada Jalan Teknika Utara, Pogung, Sleman- Yogyakarta Telp. (0274-564239 extc. 207)
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INDONESIA
Jurnal Teknosains
Published by Universitas Gadjah Mada
ISSN : 20896131     EISSN : 24431311     DOI : https://doi.org/10.22146/teknosains.xxxx
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Industrial & Manufacturing Engineering Mechanical Engineering
Jurnal Teknosains is a peer-reviewed journal which began publication in 2011, and published each semester in June and December. It is a series of scientific publications in engineering, science and technology area. Jurnal Teknosains aims to encourage research in Science and Technology studies. Topics addressed within the journal include but not limited to: Engineering, which is divided into several topics: Mechanical Engineering, Industrial Engineering, Biomedical Engineering, Chemical Engineering, Nuclear and Physical Engineering, Civil Engineering, and Planology. Basic Sciences, which is divided into: Chemistry and Physics Health Sciences, which is divided into: Medical, Biotechnology specially in Health Science, and Dentistry
Arjuna Subject : Teknik (semua kategori) - Teknik (Lain-Lain)
Articles 224 Documents
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Master recession curve visualization using seven baseflow recession models in paired watersheds Latuamury, Bokiraiya; Mardiatmoko, Gun; Kastanya, Agustinus
Jurnal Teknosains Vol 14, No 1 (2024): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.90705

Abstract

River flow recession analysis plays a crucial role in understanding how watersheds release water during dry periods. Consequently, modeling baseflow recession is closely related to the characteristics of unconfined aquifers, storage behavior, and the discharge properties of the watershed. While several theories exist on modeling recession curves, limited research has compared different approaches regarding baseflow recession characteristics. This study aims to model seven baseflow recession equations in paired watersheds in Ambon City. The research methodology involves calibrating seven baseflow recession models using the Recession Curve (RC) 4.0 Hydro Office software. The tested models include Linear Reservoir, Exponential Reservoir, Double Exponential Horton, Dupuit-Boussinesq Aquifer Storage, Depression Storage, Turbulent Flow Model, and Hyperbolic Function Model. The calibration results yield optimal combinations of recession parameters. The parameterization order from highest to lowest is as follows: Depression Storage, followed by the Hyperbolic Function, Exponential Reservoir, Turbulent Flow Model, Double Exponential Horton, Linear Reservoir, and Dupuit-Boussinesq Aquifer Storage. Quantifying baseflow recession constants and coefficients is essential for understanding baseflow behavior. Visualizing the slope of the Recession Curve (MRC) reveals that models with high recession constants tend to have gradual MRCs, while low recession constants result in steep MRCs. The MRC slope further describes the relationship between storage conditions and discharge from the watershed. The advantage of creating MRCs from discontinuous recession segments lies in their ability to appropriately describe the MRC process and provide quantitative parameters relevant to drainage mechanisms. MRCs also serve as an optimal automated computational tool.
Facility layout improvement for continuous production system: a case study in chocolate-based product Saifurrahman, Anas; Fath, Hamzah; Baasith, Darywan Damar; Aini, Yumna Nur; Wibisono, Arif; Asmara, Sang Norma Lintang
Jurnal Teknosains Vol 14, No 1 (2024): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.94930

Abstract

This study explores optimizing Yogyakarta's chocolate production system facility layout to enhance laboratory-scale production to mass production at the UGM Field Research Center laboratory. The laboratory layout was optimized based on expert assessments and the ALDEP algorithm and compared with the current layout using distance-based objective values. Both layouts were compared to highlight the importance of qualitative aspects in determining workstation positions, in addition to quantitative aspects. The distance-based analysis results indicate that the ALDEP layout outperforms the current layout, and the layout was designed with expert assessments, showing the highest efficiency and lowest material handling costs, with an estimated improvement of 23% over the current layout. Although the proposed expert-assessed layout performed worse, it met stakeholder requirements such as safety and ease of observation. Therefore, future research must consider other aspects beyond costs in evaluation metrics to determine the best layout. Although the proposed expert-assessed layout performed worse, it met stakeholder requirements such as safety and ease of observation. Therefore, future research must consider other aspects beyond costs in evaluation metrics to determine the best layout.
Make discovery through serendipity: a generative design platform for performative architectural design exploration Indraprastha, Aswin
Jurnal Teknosains Vol 14, No 1 (2024): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.100109

Abstract

The repercussions of information technologies in the design process are undoubtedly revolutionary. As the digital natives will no longer require a traditional method to learn digital tools in architecture, there is a need to shift from tradition-bound techniques to an experimental mode where creativity and innovation rely upon a platform of explorative, speculative, and the recognition of serendipity and error as a credible basis on which innovation occurs. This study seeks to embrace a new method for design exploration by a generative design platform. Form-finding is encouraged through a bottom-up process of speculative actions. The goal is to cultivate serendipitous discoveries in the design process and leverage generative tools to explore performative aspects of architecture. The findings of this research offer some insights into how generative design platforms can encourage performative architectural design exploration. 
Developing post-pandemic livable and sustainable cities: providing space for urban activities in bandung Iman, Hanafi Kholifatul; Tsana, Shafwatus; Febriani, Nurindah; Prilandita, Niken; Fatmadewi, Rose
Jurnal Teknosains Vol 14, No 1 (2024): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.100166

Abstract

Providing space for urban activities and preserving the environment are contradictory issues in urban development, including Bandung City, which COVID-19 exacerbates. With limited carrying capacity, the impact of COVID-19, and high levels of urban activity, there are issues regarding the impact of urban activity on the quality of the post-pandemic urban environment. Therefore, it is necessary to research the limitation of Bandung City's carrying capacity to accommodate post-pandemic urban activities. This research aims to formulate a post-pandemic development concept and framework for Bandung City based on the environment's ability to accommodate urban activities. The approach and analytical method used in this research is descriptive-qualitative analysis, which can explore and focus on deepening the literature used as a basis for drafting the concept. In general, this research results in the concept of a livable and sustainable post-pandemic development, including formulating indicators for Bandung that reflect what Bandung City needs to develop after the pandemic. This research is quite important because it can see the characteristics of Bandung City and formulate its development by the conditions of Bandung City so that the government or planner can use these results as evaluation material or suggestions for the Bandung City and West Java Provincial Government in monitoring and evaluating the implementation of strategies, policies, and programs inappropriate development with environmental capacity in the Bandung Basin Urban Area and North Bandung Area.
Optimization of urban thermal environment for indonesia coastal-climate urban area: a microclimatic modeling Gunawan, Kelvin Narada; Zidane, Chairil; Koerniawan, M Donny
Jurnal Teknosains Vol 14, No 1 (2024): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.100303

Abstract

Coastal urban areas, one of which is the PIK 2, Tangerang Regency, Indonesia, as the study case, have distinctive climate characteristics: changes in land and sea breezes during different seasons and high humidity and wind speed levels, which affect thermal comfort. The optimal building mass needs to be studied to achieve ideal thermal comfort conditions, which can effectively respond to climate characteristics different from those of other urban areas. This paper investigates the existing urban thermal environment and models the impact of building orientation, form, and H/W ratio simulated in ENVI-met. Based on the study findings, it has been determined that positioning a building diagonally towards the sea at a 45-degree angle effectively reduces excessive wind speeds, resulting in a favorable PMV score. Additionally, incorporating a sky bridge into the building form design provides adequate shading and contributes to achieving optimal thermal comfort in coastal-climate urban areas. Moreover, the optimal H/W ratio is 0.5, which can reduce wind speed without significantly lowering the temperature, thereby maintaining thermal comfort.
Mapping settlement typologies and business functions in yogyakarta riverbank area Amijaya, Sita Yuliastuti; Dewangga, Yordan Kristanto
Jurnal Teknosains Vol 14, No 1 (2024): December
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.100335

Abstract

A residential property functions as a place to live. In some conditions, a residential space can be transformed into a business or production space simultaneously. Business or production spaces require indoor comfort, such as the minimum standards for indoor lighting, which can be challenging to achieve in a dense residential area. This affects the typology of business space, which is integrated with the residential function. This research is part of a study of visual comfort or lighting in workspaces or business spaces. This research aims to identify types of dwellings that have changed from residential to business functions in dense settlements such as urban kampungs or villages. The study is in the Suryatmajan subdistrict in Yogyakarta City, including the urban villages of Ledok Macanan, Gemblakan Atas, Gemblakan Bawah, and Cokrodirjan. The identification will produce mapping that provides information regarding the types of residences and businesses found at the study location. The method used is a descriptive-qualitative study, which collects data through field observations, redraws from observations, and short interviews with residents of the study location. The study found six typologies of residential and business space commonly found in the four urban villages in Yogyakarta..    
Effect of extraction, ratio, and solvent concentration on total flavonoid content and antioxidant activit of singkel (premna serratifolia linn.) using dpph method Isnindar, Isnindar; Luliana, Sri; Zahid, Muhammad
Jurnal Teknosains Vol 14, No 2 (2025): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.100099

Abstract

Singkel (Premna serratifolia Linn.) is a medicinal plant commonly found in tropical regions, including Indonesia, which contains flavonoids, alkaloids, polyphenols, and triterpenoids. Flavonoids in singkel leaves act as antioxidants that can prevent oxidative stress, which is a causative factor of degenerative and chronic diseases such as cancer, arthritis, and cardiovascular diseases. This study aims to determine the effects of total flavonoid content and IC50 values in singkel leaves based on extraction methods, solvent concentration, and the ratio of extract to solvent. The methods used include maceration, soxhlet extraction, and Microwave-Assisted Extraction (MAE), with ethanol solvent concentrations of 60%, 70%, 80%, and 96%, and extract-to-solvent ratios of 1:10, 1:20, and 1:30. Antioxidant activity was measured using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method with UV-Vis spectrophotometry. The results showed that the soxhlet extraction method yielded the highest total flavonoid content of 24.56±1.81 mgQE/g with an IC50 value of 20.31±1.58 μg/mL. The 96% solvent concentration provided the best results with a total flavonoid content of 26.12±0.06 mgQE/g and an IC50 value of 15.51±2.17 μg/mL. In the solvent ratio testing, the 1:20 ratio showed the highest total flavonoid content of 19.37±0.5 mgQE/g, while the 1:10 ratio provided the best IC50 value of 11.99±1.02 μg/mL. In conclusion, the extraction method, solvent concentration, and solvent ratio significantly affect the flavonoid content and antioxidant activity of singkel leaves.
Optimizing the density of ultrafine bubbles fluid by time and production volume in a closed-loop system Budiman, Arif Adtyas; Meikayani, Jentik; Nitiamijaya, Devita; Wardhani, Veronica Indriati Sri; Setiawan, Putut Hery; Juarsa, Mulya; Prayogo, Kukuh; Baiquny, Ariq Hafizh
Jurnal Teknosains Vol 14, No 2 (2025): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.100358

Abstract

Ultrafine bubbles (UFBs) play a crucial role as catalysts in water treatment, pharmaceuticals, biomedical engineering, and industrial processes, particularly those involving heat transfer mechanisms. Several researchers in Indonesia have explored ultrafine bubble fluids' potential as a heat transfer medium in passive cooling system models. In this context, changes in the density of ultrafine bubble fluids serve as the primary driver for flow. Since ultrafine bubbles increase in diameter when heated, examining an optimal production model is essential to ensure their availability in the flow. This study aims to optimize the production of ultrafine bubble fluids with the lowest possible density compared to the base fluid (reference). The research investigates the effect of production time and volume variations on ultrafine bubble density in a closed-loop system. Production times of 30, 60, 90, 120, 150, and 180 minutes are tested across tank volumes of 20, 40, 50, and 60 liters. The closed-loop production model utilizes hydrodynamic cavitation to maintain continuous fluid flow, with sample collection occurring at 15-minute intervals after the initial production time to allow for stable bubble size. Observations and statistical analysis using the Response Surface Method (RSM) reveal a nonlinear relationship between production time and ultrafine bubble fluid density. The optimal density is achieved with a production time of 60 minutes for a 40-liter volume. Additionally, this closed-loop model increases the temperature of the ultrafine bubble fluid to 54.3 °C in a 20-liter volume. Heat accumulation occurs due to the continuous pump-driven flow without additional cooling systems.
Potential of baroma rice as anti-cancer food candidate via cell cycle arrest and apoptosis Pranatami, Dwimei Ayudewandari; Akmalia, Hafidha Asni
Jurnal Teknosains Vol 14, No 2 (2025): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.101243

Abstract

Cancer is a condition where the body's cells continue to divide without control. Often, this cancer is detected when it has entered an advanced stage, making it difficult to treat. Rice is a staple food widely used by more than half of Indonesia's population. The position of rice, which is a staple food, can be used as a prospective treatment to overcome the increasing number of cancer cases, especially in cases of colon cancer. Rice is reported to have many beneficial chemical contents. In cytotoxicity testing using WiDr colon cancer cells, the IC50 of the ethanolic extract of baroma rice is 316.01µg/ml. Stovetop cooked baroma rice showed an IC50 value of 672 µg/ml, while magic com cooked rice showed an IC50 value of 1232 µg/ml. Raw and stove-cooked baroma rice extracts are not strong enough to trigger apoptosis in cancer cells and can arrest the cell cycle at the G1 stage. This research shows that baroma rice extract has cytotoxic properties against WiDr colon cancer cells and various other evidence regarding the advantages of baroma rice. It is hoped that this rice can become a food that can prevent colon cancer.
Production and characterization of lactic acid bacteria biofilms synthesized using tofu wastewater Atmandaru, Susmaya; Solichah, Amalia; Retnaningrum, Endah
Jurnal Teknosains Vol 14, No 2 (2025): June
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/teknosains.103083

Abstract

Biofilms serve to protect microbes from environmental conditions. Biofilms produced by lactic acid bacteria (LAB) can even inhibit the growth of pathogens. Medium de Man Ragosa Sharpe (MRS) is a specific medium for LAB growth and biofilm formation; however, it is not effective on an industrial scale due to its high cost. Tofu wastewater serves as an alternative medium because it contains complete nutrients that support the formation of LAB biofilms. This study aimed to determine the effect of C and N formulation in tofu wastewater on the production and characterisation of biofilms produced by four Lactobacillus (LAB) strains, including Enterococcus casseliflavus F4IS5, E. casseliflavus F14IS5, and E. casseliflavus F14IS6. Glucose and ammonium sulfate were added to the tofu wastewater as carbon and nitrogen sources, respectively. The biofilm-forming ability of LAB was tested by the biofilm assay method. The LAB biofilm characteristics were tested based on adhesion, while the exopolysaccharide concentration, a component of the biofilm, was analysed using the dry weight method. The inhibitory activity of LAB biofilms against the growth of pathogenic bacteria, specifically Escherichia coli and Staphylococcus aureus, was tested using the microplate method. The highest LAB biofilm production was obtained from the E. casseliflavus F6IS4 isolate in a tofu wastewater medium supplemented with 2% glucose and 1% ammonium sulfate, with an incubation time of 48 hours. The biofilm produced was categorised as a strong biofilm, which also exhibited strong adhesion; the separate cells accounted for only 19.25%. Besides, the EPS production by the strain was 63.4%. The biofilm of E. casseliflavus F6IS4 in tofu wastewater, supplemented with 2% glucose and 1% ammonium sulfate, also exhibited the highest inhibitory activity against E. coli and S. aureus, at 2.7% and 2.1%, respectively.

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