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Articles 211 - 240 of 590
Full-Text Articles in Biotechnology
Establishing An Ocean Acidification Monitoring System For The Tropical Waters Of Indonesia Facing Regional Climate Variability, Prayitno Hanif Budi, Puspitasari Rachma, Jandang Suppakarn, Triana Karlina, Taufiqurrahman Edwards, Lestari, Afdal, Wulandari, Harmesa, Meirinawati Hanny, Lastrini Suci, Kaisupy Muhamad Taufik, Wahyudi A'An Johan
Establishing An Ocean Acidification Monitoring System For The Tropical Waters Of Indonesia Facing Regional Climate Variability, Prayitno Hanif Budi, Puspitasari Rachma, Jandang Suppakarn, Triana Karlina, Taufiqurrahman Edwards, Lestari, Afdal, Wulandari, Harmesa, Meirinawati Hanny, Lastrini Suci, Kaisupy Muhamad Taufik, Wahyudi A'An Johan
ASEAN Journal on Science and Technology for Development
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 …
Optimization Of Building Configuration In Vertical Residential Housing Towards Outdoor Thermal Comfort: Case Study Of Tambora Flats, Jakarta, Indonesia, Rizqi Khairani Ayu, Prayitno Budi
Optimization Of Building Configuration In Vertical Residential Housing Towards Outdoor Thermal Comfort: Case Study Of Tambora Flats, Jakarta, Indonesia, Rizqi Khairani Ayu, Prayitno Budi
ASEAN Journal on Science and Technology for Development
Population growth in Indonesia is not offset by the construction of urban facilities and infrastructure and the improvement of urban services. In densely populated urban areas with narrow residential conditions, the demand for shelter is higher, causing an increase in the price of land and housing. One of the efforts in responding to this problem in the Special Capital Region of Jakarta is to build vertical residential or flats. This study aimed to determine the level of outdoor thermal comfort of Tambora flats in Jakarta, which have air temperatures ranging 26–29°C and air humidity of 76–92%. Existing flats were simulated …
Comprehensive Assessment On The Environmental Conditions Of Abandoned And Inactive Mines In The Philippines, Samaniego Jessie, Gibaga Cris Reven, Tanciongco Alexandria, Rastrullo Rasty, Mendoza Norman, Racadio Charles Darwin
Comprehensive Assessment On The Environmental Conditions Of Abandoned And Inactive Mines In The Philippines, Samaniego Jessie, Gibaga Cris Reven, Tanciongco Alexandria, Rastrullo Rasty, Mendoza Norman, Racadio Charles Darwin
ASEAN Journal on Science and Technology for Development
Most abandoned and inactive mines in the Philippines pose high risks to human health and the environment due to the disturbed and exposed heavy metal-laden soils and sediments and water-filled open pit mines. Establishing these mines’ environmental conditions remains a challenge as it requires time, effort, resources, and faces a lack of funding as the economic phase of the mine has already ceased. In order to contribute to the solution on the assessment of abandoned and inactive mines, integrated methods with combined essential testing, sampling, and analyses of different environmental media present in the mine site are suggested in this …
Dynamic Changes Analysis Of Land Resource Balance In North Maluku Province, Indonesia, Faroh Elya Pratiwi Isti, Puspaningrani Fatih Cinderaswari, Reinadova Gema, Akbar Muhammad Rais, Anggraeni Novanna Dwi Septyo, Wildiyanti Oki Silvie, Kafafa Utia, Putri Ratih Ratih
Dynamic Changes Analysis Of Land Resource Balance In North Maluku Province, Indonesia, Faroh Elya Pratiwi Isti, Puspaningrani Fatih Cinderaswari, Reinadova Gema, Akbar Muhammad Rais, Anggraeni Novanna Dwi Septyo, Wildiyanti Oki Silvie, Kafafa Utia, Putri Ratih Ratih
ASEAN Journal on Science and Technology for Development
Land resources are part of nature related to the availability of water, nutrients, and food that are dynamic and play an important role in the lives of living creatures, including humans. From time to time, land use experiences changes in response to human activities that benefit their lives. This research was conducted to determine trends in land use change in North Maluku Province, Indonesia, as well as to find out the land resource balance and land carrying capacity in the province. The methods comprised a simple descriptive and quantitative analysis along with spatial analysis using GIS. The results showed that …
Water Quality Assessment And Monitoring Of Closed Rearing System Of The Sea Cucumber Holothuria Scabra, Meirinawati Hanny, Prayitno Hanif Budi, Indriana Lisa Fajar, Firdaus Muhammad, Wahyudi A'An Johan
Water Quality Assessment And Monitoring Of Closed Rearing System Of The Sea Cucumber Holothuria Scabra, Meirinawati Hanny, Prayitno Hanif Budi, Indriana Lisa Fajar, Firdaus Muhammad, Wahyudi A'An Johan
ASEAN Journal on Science and Technology for Development
Sea cucumbers are an essential fishery resource. Therefore, effective aquaculture methods should be developed to achieve their optimal production. Sea cucumbers are susceptible to various environmental factors, one of which is water quality. Monitoring water quality based on physical and chemical parameters should be useful to the rearing system in aquaculture. In practical use, farmers usually monitor only temperature, salinity, and pH, neglecting the essential role of chemical parameters. This review focuses on and urges the monitoring of physical and chemical parameters. We explored the water quality parameters that may be crucial to the sea cucumber rearing system, including temperature, …
Letter To The Editor: The Invasive Caribbean Mytilopsis Sallei (Bivalvia: Dreissenidae): A Short Review, Marelli Dan
Letter To The Editor: The Invasive Caribbean Mytilopsis Sallei (Bivalvia: Dreissenidae): A Short Review, Marelli Dan
ASEAN Journal on Science and Technology for Development
This letter seeks to comment on the taxonomy of members of the genus Mytilopsis (Bivalvia: Dreissenidae) that are found as invasive species in many Asian estuarine systems.
Reply To Letter To The Editor: The Invasive Caribbean Mytilopsis Sallei (Bivalvia: Dreissenidae): A Short Review, Tan Koh Siang, Tay Teresa
Reply To Letter To The Editor: The Invasive Caribbean Mytilopsis Sallei (Bivalvia: Dreissenidae): A Short Review, Tan Koh Siang, Tay Teresa
ASEAN Journal on Science and Technology for Development
This letter provides a response to the letter concerning "The Invasive Caribbean Mytilopsis sallei (Bivalvia: Dreissenidae): a Short Review" by Tan and Tay in AJSTD 35(1–2): 133–139.
Application Of Biogasoline In A Four-Stroke Motorcycle Engine, Saputra Sutrisna, Wijaya Karna, Mudjijana
Application Of Biogasoline In A Four-Stroke Motorcycle Engine, Saputra Sutrisna, Wijaya Karna, Mudjijana
ASEAN Journal on Science and Technology for Development
The problems facing the world, in relation to the increasing consumption of petroleum and its limited sources, as well as pollution by fuel-related gases, such as CO, have sparked research on the application of biogasoline as an environmentally friendly alternative fuel. Our research aimed to determine engine performance through mixtures of biogasoline and gasoline to measure torque, power, and fuel consumption rate, and to determine the effect of the mixture on the level of air pollution. The biogasoline used was previously prepared from cooking oil through a Cr-zeolite-catalyzed process. The testing methods on the fuel mixture as a working substance …
Global Retrofitting Strategies For An Existing Three-Storied Rc School Building In Mandalay, Myanmar, Thwe Thiri, Thwin Nang Su Le′ Mya, Hein Ne Min
Global Retrofitting Strategies For An Existing Three-Storied Rc School Building In Mandalay, Myanmar, Thwe Thiri, Thwin Nang Su Le′ Mya, Hein Ne Min
ASEAN Journal on Science and Technology for Development
Low to severe earthquakes occur around the world every year, damaging and causing structural failure in buildings. Consequently, seismic improvements are required for existing buildings that are vulnerable to damage by seismic forces. The objective of this study was to investigate retrofitting strategies in terms of their sustainability. Mandalay, Myanmar, was selected as the study area as it is located near the Sagaing fault, which itself is in a strong earthquake zone (seismic zone 4). A three-storied RC building with a non-seismic design was selected as a case study building. An investigation was carried out into the performance and vulnerability …
A Catalyst Reusability Study In Palm Fatty Acid Distillate And Glycerol Esterification Using Multi-Criteria Decision Analysis And Reaction Kinetics Approach, Sudibyo Hanifrahmawan, Setyaningrum Febbie, Rochmadi, Fahrurrozi Mohammad
A Catalyst Reusability Study In Palm Fatty Acid Distillate And Glycerol Esterification Using Multi-Criteria Decision Analysis And Reaction Kinetics Approach, Sudibyo Hanifrahmawan, Setyaningrum Febbie, Rochmadi, Fahrurrozi Mohammad
ASEAN Journal on Science and Technology for Development
As a byproduct of the physical refinement of crude palm oil, palm fatty acid distillate or PFAD has a potential to be transformed into monoglycerides by means of irreversible esterification with glycerol over a cation exchange resin catalyst. Irreversibility of the esterification can be assured by continuous azeotropic removal of water by adding xylene as an entrainer. Because PFAD-glycerol esterification demands high temperatures for fast conversion and high selectivity of monoglycerides, it is necessary to test catalyst reusability performance. In this research, evaluation of catalyst reusability performance was based on five parameters: free fatty acid conversion, the rate of free …
Conceptual Shield Design For Boron Neutron Capture Therapy Facility Using Monte Carlo N-Particle Extended Simulator With Kartini Research Reactor As Neutron Source, Tsurayya Afifah Hana, Iman Azzam Zukhrofani, Sari R. Yosi Aprian, Fauzi Arief, Wijaya Gede Sutresna
Conceptual Shield Design For Boron Neutron Capture Therapy Facility Using Monte Carlo N-Particle Extended Simulator With Kartini Research Reactor As Neutron Source, Tsurayya Afifah Hana, Iman Azzam Zukhrofani, Sari R. Yosi Aprian, Fauzi Arief, Wijaya Gede Sutresna
ASEAN Journal on Science and Technology for Development
The research aims to measure the radiation dose rate over the radiation shielding which is made of paraffin and aluminium and to determine the best shield material for the safety of radiation workers. The examination used MCNP (Monte Carlo N-Particle) simulator to model the BNCT neutron source and the shield. The shield should reduce radiation to less than the dose limit of 10.42 µSv/h, which is assumed to be the most conservative limit when the duration of workers is 1920 h. The first design resulted in a radiation dose rate which was still greater than the limit. Therefore, optimization was …
Marine Biofouling Communities Of Manila South Harbor, Philippines, Nacorda Hildie M.E., Austero Nero M., Pagdilao Cesar R., Tan Koh Siang, Azanza Rhodora V.
Marine Biofouling Communities Of Manila South Harbor, Philippines, Nacorda Hildie M.E., Austero Nero M., Pagdilao Cesar R., Tan Koh Siang, Azanza Rhodora V.
ASEAN Journal on Science and Technology for Development
An immersion experiment was conducted in the Manila South Harbor to document the development of sessile biofouling communities. Test panels were submerged below the sea surface in April 2012 for short- (one and three months) and long-term (one year) exposures in seawater, then foauling types and occurrences were scored based on digital images of panel surfaces. The short-term immersed panels were found with significant cover of soft fouling (undet.), slime, and the invasive Balanus (=Amphibalanus) amphitrite. These also filled the long-term immersed panels, although some fell off due to mortality from crude oil smothering. Perna viridis, native but also invasive, …
Boron Neutron Capture Therapy For Cancer: Future Prospects In Indonesia, Poedjomartono Bagaswoto, Afkari Hanif, Meiyanto Edy, Bangun Alan, Sardjono Yohanes
Boron Neutron Capture Therapy For Cancer: Future Prospects In Indonesia, Poedjomartono Bagaswoto, Afkari Hanif, Meiyanto Edy, Bangun Alan, Sardjono Yohanes
ASEAN Journal on Science and Technology for Development
Boron neutron capture therapy (BNCT) is a form of cancer therapy based on the interaction of low-energy thermal neutrons and boron-10 (10-B) to produce alpha radiation from He-4 and Li-7 with a high linear energy transfer. A beam of neutrons irradiates a boron drug injected into the tumor, resulting in the boron-injected cancer cells receiving a lethal dose of radiation with the surrounding, healthy cells being minimally affected. Two boron drugs have been used clinically in BNCT, boron sodium captate (BSH) and borophenylalanine (BPA), while a third, pentagamaboronon-0 (PGB-0), is currently under development in the Faculty of Pharmacy of Universitas …
Characteristics Of Paraffin Shielding Of Kartini Reactor, Yogyakarta, Khanifah Lana, Widodo Susilo, Widarto, Putra Ngurah Made Dharma, Satrio Argo
Characteristics Of Paraffin Shielding Of Kartini Reactor, Yogyakarta, Khanifah Lana, Widodo Susilo, Widarto, Putra Ngurah Made Dharma, Satrio Argo
ASEAN Journal on Science and Technology for Development
The National Nuclear Energy Agency (BATAN) Yogyakarta uses two kinds of paraffin for shielding radiation of Kartini reactor. For developing BNCT research, the radiation attenuation capability of paraffin has been analyzed to find out the coefficient attenuation, density, and composition of both kinds of paraffin. The components of the paraffin were analyzed using Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray (EDX) spectroscopy characterization. Paraffin P1 has a density of 0.689 gr/mL and paraffin P2 is 0.578 gr/mL. Paraffin samples P1 and P2 were the sample content of functional group CH, CH2, and OH when …
Dose Analysis Of Bnct Treatment Method For Rhabdomyosarcoma In The Head And Neck Regions Based On Phits Code, Syamputra Dhani Nur Indra, Sardjono Yohannes, Mahmudah Rida Siti Nur’Aini
Dose Analysis Of Bnct Treatment Method For Rhabdomyosarcoma In The Head And Neck Regions Based On Phits Code, Syamputra Dhani Nur Indra, Sardjono Yohannes, Mahmudah Rida Siti Nur’Aini
ASEAN Journal on Science and Technology for Development
The objectives of this research were to ?nd (1) the optimum boron dose for treating rhab- domyosarcoma in the head and neck regions and (2) the effective irradiation time to treat rhab- domyosarcoma in the head and neck regions. This research used the particle and heavy ions transport code system (PHITS) to simulate the neutron source and BNCT doses. The neutron source used was Kartini Reactor. The simulation was carried out by creating the geometry of cancer tissue in the head and neck regions. Boron concentration variance was 30, 35, 40, 45, and 50 µg/g tissue. The output of PHITS …
Dose Analysis Of Boron Neutron Capture Therapy (Bnct) Treatment For Lung Cancer Based On Particle And Heavy Ion Transport Code System (Phits), Harish Ahmad Faisal, Warsono, Sardjono Yohannes
Dose Analysis Of Boron Neutron Capture Therapy (Bnct) Treatment For Lung Cancer Based On Particle And Heavy Ion Transport Code System (Phits), Harish Ahmad Faisal, Warsono, Sardjono Yohannes
ASEAN Journal on Science and Technology for Development
The objectives of this study were to determine the effect of boron concentration on total dose rate for lung cancer treatment, and to determine the effect of boron concentration on the length of irradiation time for lung cancer treatment. This study was computer simulation-based using the Particle and Heavy Ion Transport code System (PHITS) by defining the geometry and components of lung cancer and the surrounding organism as the object being studied and the source of radiation used. The type of phantom used was the ORNL of an adult Asian male. The neutron source used was Kartini Reactor. The independent …
The Invasive Caribbean Mytilopsis Sallei (Bivalvia: Dreissenidae): A Short Review, Tan Koh Siang, Tay Teresa
The Invasive Caribbean Mytilopsis Sallei (Bivalvia: Dreissenidae): A Short Review, Tan Koh Siang, Tay Teresa
ASEAN Journal on Science and Technology for Development
The mussel-like bivalve species from the Caribbean, Mytilopsis sallei, is now well established in the vicinities of several ports in South and Southeast Asia. Although it may not be as notorious as its relative the zebra mussel Dreissena polymorpha, this brackish-water bivalve has the ability to colonise and displace native species in intertidal and subtidal habitats. It is also another testament to how well a tropical species can travel beyond its natural biogeographical boundaries. Here we briefly review its taxonomy, morphology, growth and reproduction, habitat and distribution, as well as its impact on natural habitats after invasion, based on published …
Survey Of Marine Phytoplankton In Ship’S Ballast Tanks At Laem Chabang International Port, Thailand, Kajonwattanakul Sumana, Numnual Waranya, Sirichaiseth Thanyapas, Wannarangsri Tanet
Survey Of Marine Phytoplankton In Ship’S Ballast Tanks At Laem Chabang International Port, Thailand, Kajonwattanakul Sumana, Numnual Waranya, Sirichaiseth Thanyapas, Wannarangsri Tanet
ASEAN Journal on Science and Technology for Development
Marine phytoplankton was investigated in ballast water of ships from 2010 to 2012 with a collection of 30 marine vessels that docked at Laem Chabang International Port in Chonburi Province, Thailand. The results showed that the dominant group of phytoplankton was diatoms. The amount of phytoplankton in the ballast tanks averaged less than 10 cells/ mL, which is less than Regulation D-2 of the Ballast Water Management Convention which requires that marine organisms between the sizes of 10 ? X <50 µm should be less than 10 cells/mL and size ? 50 µm should be less than 10 cell/m3 in ballast water. Alien species of phytoplankton was not recorded in this survey.
Gis Developments For Ecosystem-Based Marine Spatial Planning And The Challenges Faced In Indonesia, Triana Karlina, Wahyudi A'An Johan
Gis Developments For Ecosystem-Based Marine Spatial Planning And The Challenges Faced In Indonesia, Triana Karlina, Wahyudi A'An Johan
ASEAN Journal on Science and Technology for Development
Aiming to lessen degradations and effects on marine ecosystems, Marine Spatial Planning is used as a management method with a purpose to help lead the development and used in the marine environment. The stages of the planning are collection, management, and analysis of spatial data, and also decision support systems. This method requires tools to be able to achieve the goals effectively. Geographic Information System (GIS) and remote sensing can efficiently and effectively be used to access and summarize spatial data into information forms to evaluate the Marine Spatial Planning projects. GIS and remote sensing obviously have an essential function …
Recovery And Purification Of Glycerine As By-Product From Philippine Coconut Methyl Ester, Briones Annabelle V.
Recovery And Purification Of Glycerine As By-Product From Philippine Coconut Methyl Ester, Briones Annabelle V.
ASEAN Journal on Science and Technology for Development
The study is about the recovery and purification of glycerine as a by-product from coconut methyl ester production in the Philippines. The aqueous layer produced from settling or phase splitting of the methyl ester after the transesterification process was subjected to various treatments like acidification, neutralization, concentration in vacuo in order to get back the crude glycerine. The crude glycerine obtained from the laboratory and scale-up process conformed with the specification set by the British standard for crude glycerine. The recovered glycerine is composed of: 84.92%, glycerine; 8.03%, ash; 4.72%, H20; 2.32%, MONG. Further distillation yielded a refined glycerine that …
Understanding Forest Fire Management In Indonesia From A Global Perspective, Riyanto Indra Agus, Cahyadi Ahmad, Kurniadhini Faricha, Bachtiar Hafidz, Apriyana Dwiki, Caraka Brian Kannardi Aji
Understanding Forest Fire Management In Indonesia From A Global Perspective, Riyanto Indra Agus, Cahyadi Ahmad, Kurniadhini Faricha, Bachtiar Hafidz, Apriyana Dwiki, Caraka Brian Kannardi Aji
ASEAN Journal on Science and Technology for Development
Forest fires are one of the global issues that attract worldwide attention. Russia, Brazil, Canada, the United States, and Indonesia are among the countries with the largest forest cover and long records of massive forest fires. Forest fire management is, therefore, critical to decreasing the severity level of these fires. Current conditions indicate that, compared with the four other countries, Indonesia has significantly reduced forest fires within the past five years. Consequently, adopting a global perspective to study the characteristics of forest fire disaster management has become necessary. For each management parameter, this research employed a literature review and descriptive …
The Indonesian Throughflow And Its Impact On Biogeochemistry In The Indonesian Seas, Taufiqurrahman Edwards, Wahyudi A’An J., Masumoto Yukio
The Indonesian Throughflow And Its Impact On Biogeochemistry In The Indonesian Seas, Taufiqurrahman Edwards, Wahyudi A’An J., Masumoto Yukio
ASEAN Journal on Science and Technology for Development
It has been widely known that the Indonesian Throughflow (ITF) is an important inter-ocean connection with unique and complex oceanographic and geographic conditions, as well as a strong relation to both regional and global ocean currents and climate systems. Many studies on characteristics, mechanisms, and impacts of the ITF have been conducted, mainly focusing on the ITF pathways, transport, water mass mixing processes, and their variability in connection with monsoons and climate systems. In this paper, we summarize some of the critical aspects related to ocean conditions within the Indonesian Seas and the Indonesian Throughflow, with the main focus on …
Anthropogenic Signatures In The Context Of Landscape Evolution: Evidence From Citanduy Watershed, Java, Indonesia, Malawani Mukhamad Ngainul, Mardiatno Djati, Haryono Eko
Anthropogenic Signatures In The Context Of Landscape Evolution: Evidence From Citanduy Watershed, Java, Indonesia, Malawani Mukhamad Ngainul, Mardiatno Djati, Haryono Eko
ASEAN Journal on Science and Technology for Development
The impact of humans on landscapes may differ across regions because anthropogenic intervention on the respective landscapes occurs in different human-induced contexts. This study was designed to assess the human-induced landscape evolution of the Citanduy Watershed, Java, Indonesia, and determine its anthropogenic signatures. Several approaches were used, namely anthropogenic landscape identification, anthropogenic soil development, sediment analysis, and monitoring of changes to Segara Anakan lagoon at the mouth of the Citanduy Rier. Five types of anthropogenic landscapes were observed in the research area, from a slightly modified landscape to a fully anthropogenic landscape. The anthropogenic signature was also found in the …
Comparison Of 3d Coral Photogrammetry And Coral Video Transect For Coral Lifeform Analysis Using Low-Cost Underwater Action Camera, Ahmad Zuhairi Bin, Mohd Jinah Muhammad Idzham Helmi Bin, Saad Shahbudin Bin
Comparison Of 3d Coral Photogrammetry And Coral Video Transect For Coral Lifeform Analysis Using Low-Cost Underwater Action Camera, Ahmad Zuhairi Bin, Mohd Jinah Muhammad Idzham Helmi Bin, Saad Shahbudin Bin
ASEAN Journal on Science and Technology for Development
This research analysed the use of 3D Coral Photogrammetry (CP) and Coral Video Transect (CVT) images collected from SCUBA divers using a low-cost underwater action camera to examine the coral lifeform. A comparison was made between data sets obtained using both methods on nine transects with different coral lifeform compositions and percentage cover within an area of 4 × 7 m. The comparison of the statistical analysis for CPCe revealed that there were no significant differences (p < 0.05) between CP and CVT photos where dead corals (p = 0.006), sand (p = 0.011), and unknown (p = 0.002) are present. Additionally, the coral value (p = 0.131) between CP and CVT was not significant. CP was capable of producing prominent branching, massive, and plate coral morphology results. This suggests that survey methods using low-cost action cameras for 3D Coral Photogrammetry would yield appropriate results in terms of coral lifeform detection. Hypothetically, by improving camera quality, it will yield a higher accuracy of 3D coral images that are suitable for use in scientific research and management. Other benefits of using CP include the possibilities for future studies with 3D coral surveys using remotely operated vehicles, less field time, and 3D coral seabed information.
Problem Solving Of Isopropyl Alcohol – Water Azeotropic Characteristics Using Packed (Natural Zeolite) Bed Adsorber, Prasakti Laras, Hartono Muhammad, Jati Pandu Prabowo, Setiaji Muhammad Fajar, Wirawan Sang Kompiang, Sudibyo Hanifrahmawan
Problem Solving Of Isopropyl Alcohol – Water Azeotropic Characteristics Using Packed (Natural Zeolite) Bed Adsorber, Prasakti Laras, Hartono Muhammad, Jati Pandu Prabowo, Setiaji Muhammad Fajar, Wirawan Sang Kompiang, Sudibyo Hanifrahmawan
ASEAN Journal on Science and Technology for Development
The adsorption kinetics of water from an azeotropic mixture of isopropyl alcohol and water using chemically activated natural zeolites with and without a binder (starch) was investigated. In addition, an investigation of the compressive strength of zeolite pellets was conducted to ascertain the performance of the adsorbent for long-term operation. Three parameters were applied in the zeolite-making process: the particle size of zeolite (20, 30, 50, and 80 mesh), the sintering temperature (550, 750, and 1,000°C), the compaction pressure (2, 4, and 6 tonnes), and the starch-to-zeolite weight ratio (0, 1:3, 1:5, and 1:7). Initial screenings indicated that the strongest …
Singv – The Convective-Scale Numerical Weather Prediction System For Singapore, Huang Xiang-Yu, Barker Dale, Webster Stuart, Dipankar Anurag, Lock Adrian, Mittermaier Marion, Sun Xiangming, North, Darvell Rob, Boyd Douglas, Lo Jeff, Liu Jianyu, Macpherson Bruce, Heng Peter, Maycock Adam, Pitcher Laura, Tubbs Robert, Mcmillan Martin, Zhang Sijin, Hagelin Susanna, Porson Aurore, Song Guiting, Beckett Becky, Cheong Wee Kiong, Semple Allison, Gordon Chris
Singv – The Convective-Scale Numerical Weather Prediction System For Singapore, Huang Xiang-Yu, Barker Dale, Webster Stuart, Dipankar Anurag, Lock Adrian, Mittermaier Marion, Sun Xiangming, North, Darvell Rob, Boyd Douglas, Lo Jeff, Liu Jianyu, Macpherson Bruce, Heng Peter, Maycock Adam, Pitcher Laura, Tubbs Robert, Mcmillan Martin, Zhang Sijin, Hagelin Susanna, Porson Aurore, Song Guiting, Beckett Becky, Cheong Wee Kiong, Semple Allison, Gordon Chris
ASEAN Journal on Science and Technology for Development
Extreme rainfall is one of the primary meteorological hazards in Singapore, as well as elsewhere in the deep tropics, and it can lead to significant local flooding. Since 2013, the Meteorological Service Singapore (MSS) and the United Kingdom Met Office (UKMO) have been collaborating to develop a convective-scale Numerical Weather Prediction (NWP) system, called SINGV. Its primary aim is to provide improved weather forecasts for Singapore and the surrounding region, with a focus on improved short-range prediction of localized heavy rainfall. This paper provides an overview of the SINGV development, the latest NWP capabilities at MSS and some key results …
Fenton Oxidation Using Easily Recoverable Catalyst Of Magnetite (Fe3o4) As An Efficient Approach To Treatment Of Rhodamine B Dyeing Effluent In Traditional Fabrics Industry, Prasetyo Imam, Akbar Febry, Prabandari Anindya Widi, Ariyanto Teguh
Fenton Oxidation Using Easily Recoverable Catalyst Of Magnetite (Fe3o4) As An Efficient Approach To Treatment Of Rhodamine B Dyeing Effluent In Traditional Fabrics Industry, Prasetyo Imam, Akbar Febry, Prabandari Anindya Widi, Ariyanto Teguh
ASEAN Journal on Science and Technology for Development
A direct release of dye wastewater to a water environment without pre-treatment could cause negative impacts. To solve them, an effective method for degrading wastewater contaminants is needed. In this research, the Fenton reaction using Fe3O4 catalyst for removal of wastewater contaminants taken from a traditional fabrics industry was studied. For this purpose, reaction temperature was varied in the range of 27–90°C. Furthermore, catalyst concentration was also varied in the range of 2–6 g/L solution. The results showed that increasing both temperature and catalyst concentration will increase the performance of the Fenton reaction in degrading wastewater contaminants. The contaminant degradation …
Temporary Shelter Simulation Towards Effectiveness Value Of Ottv And Thermal Comfort, Ayu Dyah Puspa, Prayitno Budi, Hariyadi Agus
Temporary Shelter Simulation Towards Effectiveness Value Of Ottv And Thermal Comfort, Ayu Dyah Puspa, Prayitno Budi, Hariyadi Agus
ASEAN Journal on Science and Technology for Development
Indonesia is prone to a variety of natural disasters, one of which is earthquakes. Earthquakes are detrimental to human life, causing among other things a loss of shelter. As such, victims of earthquakes need basic assistance in the form of shelter, which the Indonesian government provides in the transition phase of emergency responses. Several innovations in the provision of temporary shelter have arisen in terms of packaging and fast unloading. This research aimed to examine the effective value of OTTV energy (overall thermal transfer value), differences in room temperature, and thermal comfort in existing temporary shelters. OTTV values and thermal …
Analyzing The Characteristics Of Domestic Wastes In Belik River, The Special Region Of Yogyakarta, Indonesia, Suprayogi Slamet, Marfai Muh Aris, Cahyadi Ahmad, Latifah Reviana, Fatchurohman Hendy
Analyzing The Characteristics Of Domestic Wastes In Belik River, The Special Region Of Yogyakarta, Indonesia, Suprayogi Slamet, Marfai Muh Aris, Cahyadi Ahmad, Latifah Reviana, Fatchurohman Hendy
ASEAN Journal on Science and Technology for Development
The multiplying number of population in the City of Yogyakarta has resulted in a larger volume of wastes in the region. People living on the riverbanks are unfortunately in the habit of discarding domestic waste directly to the river channel, worsening the already polluted water. This study was intended to analyze the characteristics of the municipal wastewater contaminating Belik River. During the water quality test, a rapid investigation method and laboratory analysis were employed. The sampling in the field was based on river segments and travel time of river water. Based on the laboratory test results, the concentrations of phosphate, …
Land Suitability Analysis For Housing In Pesisir Selatan Regency, West Sumatra, Indonesia, Widiyastuti Dyah, Ermawati Heni, Septiawan Lambang, Kumara Ignatius Salivian Wisnu
Land Suitability Analysis For Housing In Pesisir Selatan Regency, West Sumatra, Indonesia, Widiyastuti Dyah, Ermawati Heni, Septiawan Lambang, Kumara Ignatius Salivian Wisnu
ASEAN Journal on Science and Technology for Development
Increases in the numbers of residents in a given location have the consequence of increasing the need for living space. However, diverse environmental conditions make it impossible to develop housing in every location. Spatial analysis is therefore useful in determining land suitability for housing development so that environmental problems are avoided. The aims of this study were to determine the projected land needs for housing in Pesisir Selatan Regency, West Sumatra, Indonesia, as well as to perform suitable area mapping for housing through spatial analysis using five physical parameters (slope, disaster vulnerability, river and beach border, and protected area). The …