cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kab. sleman,
Daerah istimewa yogyakarta
INDONESIA
ASEAN Journal on Science and Technology for Development
Published by Universitas Gadjah Mada
ISSN : 22249028     EISSN : 22249028     DOI : -
Core Subject : Science, Education, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Mathematics
The coverage is focused on, but not limited to, the main areas of activity of ASEAN COST, namely: Biotechnology, Non-Conventional Energy Research, Materials Science and Technology, Marine Sciences, Meteorology and Geophysics, Food Science and Technology, Microelectronics and Information Technology, Space Applications, and Science and Technology Policy, Infrastructure and Resources Development.
Arjuna Subject : -
Articles 477 Documents
 42   43   44   45   46 
Sea Level Rise in Indonesia: The Drivers and the Combined Impacts from Land Subsidence Karlina Triana; A'an Johan Wahyudi
ASEAN Journal on Science and Technology for Development Vol. 37 No. 3 (2020): Movement
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.627

Abstract

Sea level changes play an important role as an indicator of climate change. However, without climate change, the sea level itself shows strong regional patterns, both in space and time, that could deviate significantly from global averages. The spatial variability of sea level changes in Indonesia can be divided based on its drivers, i.e., climatic and seasonal weather-driven and non-climatic and geological-driven. Seasonally, the sea level in Indonesia is generally high in northwest monsoon and low in southeast monsoon. Nevertheless, there is a possibility of extreme natural phenomenon influences that generate anomalies and a thermosteric process that also affects the sea level. On the non-climatic and geological theory, the uniqueness of the tectonic setting in Indonesia will create spatial variations in regional sea levels, as both static and dynamic changes in a long period of time. Land subsidence is also often regarded as a significant contributor to the rise of relative sea level in coastal environments. Combined with the rise in sea level, land subsidence will escalate coastal flooding risks, contribute to shoreline retreat, and be further aggravated by anthropogenic forces such as groundwater extraction and land development. This scientific review will summarize the spatial variation of sea level rise in Indonesia, examines the underlying drivers that control it, and provides an overview of the combined sea level rise and land subsidence as a significant threat in Indonesia.
Anticipating Ocean Deoxygenation in the Maritime Continent of Southeast Asia Ita Wulandari; A'an J. Wahyudi; Karlina Triana
ASEAN Journal on Science and Technology for Development Vol. 38 No. 1 (2021): A New Perspective on Development
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.630

Abstract

Oxygen plays an essential role in the biogeochemical process and ocean productivity, especially during the recent trend of climate change. Development of the oxygen loss condition, deoxygenation, receives less attention than ocean acidification and warming. Therefore, understanding deoxygenation is indispensable. The maritime continent waters of Southeast Asia (SEA) are well-known for marine biodiversity and unique geological features. The area is inevitably impacted by climate change and will suffer more due to less oxygen in seawater. Based on previous research, Bengal Bay has been affected by oxygen depletion and climate change, in which hypoxic rate conditions continuously increase. In the other SEA area, seasonal hypoxia occurs in coastal areas as an impact of eutrophication. This occurs in Sangga Besar River Estuary, Bolinao and Anda coastal waters, Manila Bay, Jakarta Bay, and Cambodian waters. Deoxygenation anticipation is an essential step as a response to the development of oxygen loss areas, and monitoring is proposed as a preliminary step before the oxygen loss worsens. This review focuses on observing oxygen depletion changes and hypoxia in the maritime continent area, including its potency, effect, and recommendations on how to monitor deoxygenation.
Vision-based Size Estimation and Centroid Positioning of Partially Occluded Fruits Mya Thin Kyu Kyu; Nay Zar Aung
ASEAN Journal on Science and Technology for Development Vol. 37 No. 3 (2020): Movement
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.636

Abstract

The objective of this study was to propose a simple and efficient image processing algorithm for estimating the size and centroid of partially occluded round fruits. In the proposed method, the size and centroid of partially occluded fruit were estimated based on the mathematical properties of the arc-radius. The experimental tests were conducted in a laboratory with orange, Sunkist, apple, and tomato fruits by setting different occlusion conditions. The occlusion percentage was varied between 0% and 90%. The accuracy and processing time of the proposed method were compared with that of the widely-used conic-section circle fitting method. The results showed that the proposed method resulted in an overall accuracy of 95.1% and processing time of 0.66 s, as opposed to 60.2% and 0.68 s, respectively, using the conic-section equation. Compared with the conic-section equation, the proposed method was able to give a more robust prediction, even for low resolution images.
Establishing an Ocean Acidification Monitoring System for the Tropical Waters of Indonesia Facing Regional Climate Variability Hanif Budi Prayitno; Rachma Puspitasari; Suppakarn Jandang; Karlina Triana; Edwards Taufiqurrahman; Lestari; Afdal; Ita Wulandari; Harmesa; Hanny Meirinawati; Suci Lastrini; Muhamad Taufik Kaisupy; A'an Johan Wahyudi
ASEAN Journal on Science and Technology for Development Vol. 37 No. 3 (2020): Movement
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.638

Abstract

The emission of greenhouse gases, including high CO2 and other materials, initiates global warming and climate change. Atmospheric CO2 that affects the carbonate system of seawater causes ocean acidification (OA). OA affects marine organisms directly, as well as humans economically and ecologically. Considering the high impact of OA and following the United Nations' Sustainable Development Goals, systematic research and monitoring of OA is necessary in Indonesia, whose seas play an important role in this emerging phenomenon. This review discusses the urgency of OA monitoring systems and suggests carbonate system monitoring, as well as carbon biogeochemistry. OA significantly affects marine production and alters ecosystem services, and it is likely to have an impact on habitats shifting from calcified to non-calcified and reducing benthic complexity. Its effect on calcifying organisms can also be found, i.e., coral calcification and/or dissolution of CaCO3 of calcifying organisms. Acidity (pH), as well as the carbonate system variables of seawater, fluctuate, especially with variations in space and time. Coastal ecosystems that are directly affected by terrestrial input will have carbonate system variables that fluctuate more. The annual rate of decreasing seawater pH, especially over an open and large spatial scale, may indicate OA. Therefore, a monitoring system must be implemented to obtain systematic and comprehensive information on OA. Here, we also introduce a biogeochemical monitoring initiative for OA in Lombok with the established protocols. Improvement of many aspects, including analysis instruments, analysis methods, sample treatment, and sampling frequency will provide new insight into further research and monitoring of OA.
Exploration of Local Microorganisms from Rumen and Their Potential to Make Silage from Agricultural Waste Listya Purnamasari; Hari Purnomo; Hidayat Bambang Setyawan
ASEAN Journal on Science and Technology for Development Vol. 37 No. 3 (2020): Movement
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.642

Abstract

Agricultural wastes are very diverse in type and have low nutrient values, especially in lignin and cellulose, which are difficult to digest. One way of overcoming this problem is by biological treatment using microorganisms, also known as silage. The availability of bio-activators that are both cost-efficient and easy to make further suggests that using local microorganisms may be an effective possible solution. This study focused on processing food crop waste (corn leaves) into silage using local microorganisms as the bio-activators. Research took place in the Agrotechnology Laboratory, University of Jember. The experimental design was completely randomized with four treatments: Treatment 1 (rumen), Treatment 2 (rumen + banana humps), Treatment 3 (rumen + petung bamboo shoots), and Treatment 4 (rumen + gamal leaves). The parameters tested were local microorganism quality (pH, total microbial, and organoleptic) and silage quality (nutrient composition, pH, and organoleptic). After three weeks, the organoleptic local microorganism test results in all treatments showed clear colors, an acidic aroma, small number of fungi, and normal pH (3–5). In terms of silage quality, the resulting local microorganisms could be used as a bio-activator in the silage fermentation process, with the maturity level indicated by a color change (green to brownish green), sweet and acidic aroma, softer tape and texture, and pH of 4–6. The proximate test results of this silage feed showed better nutrient content in the addition of formulations in the manufacture of local microorganisms. Petung bamboo shoots, gamal leaves, and banana humps can increase the nutrient content, mainly the protein. We therefore conclude that local microorganisms from the rumen and local materials can be used as activator materials in making silage from corn leaves with an increase in the value of waste nutrients.
HEC-HMS Model for Urban Flood Analysis in Belik River, Yogyakarta, Indonesia Slamet Suprayogi; Rifai; Reviana Latifah
ASEAN Journal on Science and Technology for Development Vol. 38 No. 1 (2021): A New Perspective on Development
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.643

Abstract

The rapid development of Yogyakarta has made city development increase. This construction continues to expand the reach of impervious surfaces. As a result, surface runoff and maximum discharge have increased, overflowing up to urban drainage. This study aimed to analyze the maximum discharge of the watershed based on design storms with 2, 5, 10, and 25-year return periods, used for flood control considerations. The urban flood was modelled using HEC-HMS. The results showed that the contribution of discharge flow in each segment is influenced by the dominance of land use, in which the segment dominated by dense settlements has a high contribution to the maximum discharge. The flow contribution is due to the high curve number value, which corresponds to the high surface runoff. The peak discharge of watersheds with return periods of 2, 5, 10, and 25 years are 8 m3/s, 20.1 m3/s, 29.9 m3/s, and 44.1 m3/s, respectively.
Optimum Medium for Lipase Production by Lipolytic Filamentous Fungi Isolated from Kendari Landfill Soil Nur Rayani; Miftahul Ilmi
ASEAN Journal on Science and Technology for Development Vol. 38 No. 1 (2021): A New Perspective on Development
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.644

Abstract

Lipase produced by Aspergillus is widely known and used in many industrial sectors. In a previous study, three lipolytic filamentous fungi were isolated from Kendari (Southeast Sulawesi, Indonesia) landfill soil and identified as Aspergillus niger KE1, Aspergillus terreus KC1, and Aspergillus fumigatus KE6. However, the optimization of these isolates has not been reported. In this study, statistical optimization was selected because it is more effective, efficient, economical, and robust in achieving results, and the possibility of analyzing the interaction effects among factors. Three lipolytic isolates were screened in the initial medium to obtain the highest lipolytic isolate, which was used in the medium optimization process. Optimization was performed using the series experimental design of Taguchi and RSM. Optimization successfully obtained the optimum medium with the reduction of the medium component from the previously reported medium. Aspergillus niger KE1 was the selected isolate with the highest lipase productivity after 72 h in the initial medium. The significant factors affecting lipase production were peptone, olive oil, glucose, and MgSO4 .7H2O. The model equation obtained was Y = 1043 ? 228 A + 300 B ? 19803 C + 99 A*A + 5720 B*B + 292855 C*C ? 979 A*B + 6563 A*C ? 56338 B*C. This model successfully predicted the lipase productivity with an R2 of 96.9%. The optimized medium was composed of 2% peptone, 0.1% olive oil, 0.5% glucose, and 0.075% MgSO4 .7H2O. Using the medium, lipase productivity increases 4.7-fold. Our results suggest that A. niger KE1 is a potential lipase source which catalyses the esterification reaction. Further research is needed to purify and characterize the lipase enzyme of this isolate.
Seismic Safety Assessment of Existing Low-rise RC Buildings with Rapid Visual Screenings and Preliminary Evaluation Methods Moe Myat Myat Aung; Mya Nan Aye
ASEAN Journal on Science and Technology for Development Vol. 38 No. 1 (2021): A New Perspective on Development
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.649

Abstract

Mandalay, the second largest city in Myanmar, is situated near the Sagaing Fault (the major fault in Myanmar). In the Mandalay region, the number of low-rise buildings is much greater than that of high-rise buildings. As such, seismic safety assessments of low-rise buildings play an important role in developing Mandalay as a smart city. In this study, the rapid visual screening (RVS) and preliminary evaluation for 26 numbers of three- to eight-story RC buildings were investigated with three different RVS and preliminary evaluation methods. Based on the RVS methods, the FEMA P154 Level 1 and 2 results gave the highest risk. With the Bangladesh method, the higher the story, the more vulnerable the building. Meanwhile, the Indian method showed a medium risk status. According to the preliminary evaluation, the assessed buildings need a detailed seismic evaluation, except for one building in the Indian method. Similarly, all buildings need a detailed evaluation in the Bangladesh method. The most convenient RVS and preliminary evaluation can be derived from these results for buildings in Mandalay, Myanmar. Moreover, a method can be developed for seismic safety assessments in other ASEAN countries with subsequent research.
Investigation of the Distribution of the Daytime Employed Population of Yangon, Myanmar, with and without the Impact of Work from Home Ye Wint Aung; San San Myint
ASEAN Journal on Science and Technology for Development Vol. 38 No. 1 (2021): A New Perspective on Development
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.652

Abstract

Work from home (WFH) has gradually become more popular since COVID-19 started its transmission in Myanmar during the first quarter of 2020. Its consequence was a re-evaluation of the culture of workplaces and a significant change has occurred to the pattern of daytime employment distribution. In this paper, the network distribution model was built with three constraints, Distribution Bias 1, 2, and 3. These biases were determined through questionnaires, survey data collections of responses from Yangonites, and geographical data of urban employment cores. These percentile biases influenced the amount of employed population per distribution times and gave rise to two results. One was the ordinary daytime employed population and another was the improved daytime employed distribution (considering WFH). These two results were compared and contrasted with coefficient of variations, t-tests, and other correlation methods to determine the effect of WFH on the daytime employed population. With survey data, it was clarified that majorities in Yangon do favor work from home as an alternative option for future employment. Subsequently, the compared results revealed that work from home significantly decreased the amount of employment distribution and the amount of such decrements were more consistent and had less variations, hence reducing cramming during daytime distribution.
Spurring Economic Growth in Terms of Happiness, Human Development, Competitiveness and Global Innovation: the ASEAN Case Saida Zainurossalamia ZA; Siti Amalia; Dio Caisar Darma; Musdalifah Azis
ASEAN Journal on Science and Technology for Development Vol. 38 No. 1 (2021): A New Perspective on Development
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29037/ajstd.653

Abstract

Happiness, human development, level of competitiveness, and capacity in innovation all play an important role in spurring long-term sustainable economic growth. This study presents the relationship between these factors—happiness, human development, competitiveness, and innovation in the ASEAN region—in how they influence economic growth. To date, there has been a lack of research on this specific issue, and thus it is an interesting and little-known one to study. Panel data were used comprising a combination of time series and cross-sections. The object of the study was ASEAN member countries using the multiple linear regression method. For the years of 2013–2019, we found that overall economic growth had a real impact. The results showed that human development and global innovation are two-way related to economic growth (positive and significant). Conversely, there was an insignificant influence of happiness and competitiveness on economic growth. Competitiveness, in particular, can reduce the level of economic growth. The policy considerations pursued by countries in ASEAN are through the respective governments’ strategic steps to improve the productivity of their populations, because human resources are needed not only as objects but actors in economic activities themselves in managing development.

Page 44 of 48 | Total Record : 477

 42   43   44   45   46 

Filter by Year

1984 2022


Reset
Filter By Issues
All Issue Vol. 39 No. 3 (2022): Land, Energy, and Water Resources Vol. 39 No. 2 (2022): Green Economy Vol. 39 No. 1 (2022): Community Resilience Vol. 38 No. 3 (2021): Embrace Potential Vol. 38 No. 2 (2021): Repurpose & Redefine Vol. 38 No. 1 (2021): A New Perspective on Development Vol. 37 No. 3 (2020): Movement Vol. 37 No. 2 (2020): The Perennial Quest Vol. 37 No. 1 (2020): Earth, Water & Fire Vol. 36 No. 1 (2019): Vol 36 No 1 (2019) Vol. 36 No. 3 (2019): Ahead of the Storm Vol. 36 No. 2 (2019): Across the Archipelago Vol. 35 No. 1-2 (2018): Extent of transfer of alien invasive organisms in South/Southeast Asia regio Vol. 35 No. 3 (2018): Developments in Nuclear Techniques in the Treatment of Cancer Vol. 34 No. 2 (2017): Vol 34 No 2 (2017) Vol. 34 No. 1 (2017): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 33 No. 2 (2016): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 33 No. 1 (2016): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 32 No. 2 (2015): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 32 No. 1 (2015): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 31 No. 2 (2014): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 31 No. 1 (2014): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 30 No. 1-2 (2013): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 29 No. 2 (2012): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 29 No. 1 (2012): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 28 No. 2 (2011): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 27 No. 1 (2010): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 26 No. 1 (2009): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 25 No. 2 (2008): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 25 No. 1 (2008): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 24 No. 1-2 (2007): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 24 No. 4 (2007): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 23 No. 1-2 (2006): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 23 No. 4 (2006): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 23 No. 3 (2006): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 22 No. 4 (2005): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 22 No. 3 (2005): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 21 No. 1 (2004): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 20 No. 3-4 (2003): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 20 No. 1 (2003): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 19 No. 2 (2002): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 19 No. 1 (2002): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 18 No. 2 (2001): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 18 No. 1 (2001): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 17 No. 2 (2000): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 17 No. 1 (2000): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 10 No. 2 (1993): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 8 No. 2 (1991): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 7 No. 1 (1990): ASEAN Journal on Science and Technology for Development Vol. 5 No. 2 (1988): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 5 No. 1 (1988): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 4 No. 2 (1987): Vol. 4 No. 2 (1987) Vol. 4 No. 1 (1987): ASEAN Journal on Science and Technology for Development (AJSTD) Vol. 3 No. 1 (1986): Vol. 3 No. 1 (1986) Vol. 2 No. 1 (1985): Vol. 2 No. 1 (1985) Vol. 1 No. 1 (1984): Vol. 1 No. 1 (1984) More Issue