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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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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 8 Documents
 1 
Search results for , issue "Vol 14, No 1 (2024): December" : 8 Documents clear
Male uav longitudinal stability determination using wind tunnel data Adhynugraha, Muhammad Ilham; Megawanto, Fadli Cahya; Octaviany, Siti Vivi; Budiarti, Dewi Habsari; Muliadi, Jemie; Nami, Osen Fili; Wibowo, Singgih Satrio
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.89420

Abstract

Unmanned aerial systems have been increasing in demand for a wide range of operations, including the rapid growth of advanced navigation and communication. One of the most important things in designing an Unmanned Aerial System (UAS) is to ensure the system's stability, such as the UAS itself. This study was conducted on an in-house medium altitude long endurance (MALE) UAS aircraft. It is focused on analyzing the longitudinal stability of MALE UAS. A mathematical approach was used to analyze the longitudinal stability.  A series of wind tunnel tests using a scaled model of the MALE UAS is done to produce several sets of data containing longitudinal stability derivatives for various configurations. A few sets of data are chosen to obtain the stability derivatives needed. These stability derivatives are utilized to determine the longitudinal motion characteristic of the aircraft. The analysis of certain derivatives and the phugoid and short-period mode shows that the aircraft is statically and dynamically stable in longitudinal motion. The results indicated that a weight change prompted an altercation in the natural frequency of the short-period mode. The response also showed that reaching a new equilibrium state takes a rather long period after an arbitrary perturbation is initiated. The time required to subdue oscillation in axial and average velocities is more than 100 seconds. The stability in the pitch rate is reached in around 65 seconds. The time to reach stability in pitch angle response is around 65 seconds.
Viability of bhk-21 fibroblast cells toward acrylic denture bases after reinforced by natural fibers Prawesthi, Endang; Tetelepta, Marzia Magdalena; Heldayani, Heldayani; Kastian, Ria Fajarwati; Septisetyani, Endah Puji
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.90278

Abstract

The use of acrylic denture bases in the oral cavity requires biocompatibility. This study investigated the viability of BHK-21 fibroblast cells after treatment with an acrylic denture base modified using natural fibers. Ramie and banana stem fibers were used as cost-effective alternatives to synthetic fibers. The study involved 42 acrylic resin specimens (10 mm diameter, 2 mm thickness) divided into groups: resin without fibers, 0.5%, 1.5%, and 2.5% ramie fibers, and 0.5%, 1.5%, and 2.5% banana stem fibers. The resin was incubated with cell culture media at 37°C for 7 days. Cytotoxicity testing using the MTT method revealed that all treatment groups had cell viability exceeding 70%, meeting ISO 10993-5 standards. No significant differences in cell viability were observed between the treatment groups and the control (media without specimens). Additionally, adding 0.5%, 1.5%, and 2.5% ramie fibers did not affect BHK-21 cell viability compared to the resin-only control, while adding banana stem fibers increased cell viability compared to the control (P = 0.035; P = 0.021; and P = 0.011). In conclusion, increasing the concentration of natural fibers in acrylic denture bases did not negatively impact fibroblast cell growth.
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..    

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