Asean Journal on Science and Technology for Development最新文献_第5页

Potential of Three Taro (Colocasia esculenta L.) Cultivars as Animal Feed 三个芋品种作为动物饲料的潜力

Asean Journal on Science and Technology for Development Pub Date : 2021-12-24 DOI: 10.29037/ajstd.716

H. Setyawan, R. Yulianto, Oviaki Zelin, L. Purnamasari

{"title":"Potential of Three Taro (Colocasia esculenta L.) Cultivars as Animal Feed","authors":"H. Setyawan, R. Yulianto, Oviaki Zelin, L. Purnamasari","doi":"10.29037/ajstd.716","DOIUrl":"https://doi.org/10.29037/ajstd.716","url":null,"abstract":"The growth and yield of taro (Colocasia esculenta L.) plants are influenced by the planting material. The use of planting material derived from corms is expected to improve the quality and quantity of taro growth and yield. This research aimed to find the best type of planting material and cultivars for taro growth and the potential of taro plants as animal feed. The experiment was carried out in Jember, East Java ( elevation ±89 m asl). The experiment used the randomized completed block design method with two treatment factors, the type of planting material (B) as the first factor (B1: taro corms, B2: taro tiller, B3: taro stolon) and the use of taro cultivars (V) as the second factor (V1: green taro, V2: ketan taro, V3: Sukabumi taro). The treatment was repeated four times. The results showed that there was an interaction between the use of taro planting material and taro cultivar that could influence the tuber weight per plant. The types of planting material had a significant effect on the number of tillers, leaf area, corm weight and diameter, and the planting of several taro cultivars significantly affected all observed variables. The treatment that gave the best results was planting material from taro tuber (B1) and Sukabumi cultivar (V3) with a tuber weight yield of 362.58 g (±14.5 tons/ha). Meanwhile, the Sukabumi cultivar (V3) had the best potential as animal feed. Overall, the stems and leaves of taro had a protein content of 1.19–2.02%, while the corms had 2.82–4.09%.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47095016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Analyzing the Application of Void Decks on High-rise Affordable Housing in Jakarta, Indonesia, to Achieve Optimal Urban Ventilation 印尼雅加达高层经济适用房空壳层应用分析，实现城市最佳通风

Asean Journal on Science and Technology for Development Pub Date : 2021-12-24 DOI: 10.29037/ajstd.704

Megan Afkasiga Ririhena, N. Syafii

引用次数: 0

Constructing an Imaginary Wall in the Ocean: A Technical Cartography Study on the Delimitation of Maritime Boundaries in the Provinces of South Sumatra and Bangka Belitung Islands Based on GIS 构筑海洋假想墙:基于GIS的南苏门答腊省和邦加勿里洞群岛海域边界划分技术制图研究

Asean Journal on Science and Technology for Development Pub Date : 2021-08-30 DOI: 10.29037/ajstd.641

A. Kurniawan, N. Khakhim, Karen Slamet Hardjo, A. Santoso, Widodo S Pranowo

{"title":"Constructing an Imaginary Wall in the Ocean: A Technical Cartography Study on the Delimitation of Maritime Boundaries in the Provinces of South Sumatra and Bangka Belitung Islands Based on GIS","authors":"A. Kurniawan, N. Khakhim, Karen Slamet Hardjo, A. Santoso, Widodo S Pranowo","doi":"10.29037/ajstd.641","DOIUrl":"https://doi.org/10.29037/ajstd.641","url":null,"abstract":"Marine management areas in Indonesia can be claimed 12 nautical miles from the coastline by regional governments, according to Law 23 of 2014. However, in reality, there are many provinces whose distances to other provinces are fewer than 2 $times$ 12 nautical miles, necessitating that they be delimited fairly and proportionally. The provinces of South Sumatra and Bangka Belitung Islands are such an example. The absence of clear boundaries drawn on the national map of Indonesia was the fundamental problem and focus of this study, owing to the need for delimitation of regional sea boundaries. The delimitation method used to obtain the median line was the equidistance principle using the basepoint to basepoint approach and baseline to baseline, within the consideration of the coastline proportion. Small islands are taken into account as a highly influencing factor and cause of the deviation from the pure median line. The median line results based on the basepoint to basepoint approach showed an area of the ocean as large as 7426.24:5973.41 km2, considering the coastline proportion. Meanwhile, with the baseline to baseline approach, resulting area was 7430.65:5956.13 km2 (South Sumatra:Bangka Belitung Islands). The equidistance principle is a comprehensive method for calculating the median line, as shown in this research.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42390661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The Effect of Raw Mesocarp Fibre Inclusion on the Durability Properties of Lightweight Foamed Concrete 生中果皮纤维夹杂物对轻泡沫混凝土耐久性的影响

Asean Journal on Science and Technology for Development Pub Date : 2021-08-30 DOI: 10.29037/ajstd.685

Md Azree Othuman Mydin

{"title":"The Effect of Raw Mesocarp Fibre Inclusion on the Durability Properties of Lightweight Foamed Concrete","authors":"Md Azree Othuman Mydin","doi":"10.29037/ajstd.685","DOIUrl":"https://doi.org/10.29037/ajstd.685","url":null,"abstract":"Researchers around the globe have recognised the potential need for lightweight, reliable, easy to use, affordable, and even more sustainable building materials. One of the vanguard proposals has been the procurement, development and use of alternative, non-conventional local building materials, which includes the possibility of utilising lightweight foamed concrete (LFC). LFC is excellent under compression but poor in tensile stress, as it produces multiple microcracks. LFC cannot withstand the tensile stress induced by applied forces without additional reinforcing elements. This research was conducted to examine the potential utilisation of oil palm mesocarp fibre-reinforced (OPMF) LFC in terms of its durability. Two densities, 600kg/m3 and 1200kg/m3, were cast and tested with five different percentages of OPMF, which were 0.00% (control), 0.15%, 0.30%, 0.45% and 0.60%. The parameters evaluated were water absorption, porosity, drying shrinkage, ultrasonic pulse velocity. The results revealed that the inclusion of OPMF in LFC helps to minimise water absorption and the porosity of LFC. Moreover, the inclusion of OPMF also improves the drying shrinkage and ultrasonic pulse velocity of LFC.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69629682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Structural and Electrical Properties of Silica Materials from Rice Husks 稻壳中二氧化硅材料的结构和电学性能

Asean Journal on Science and Technology for Development Pub Date : 2021-08-30 DOI: 10.29037/ajstd.697

Casnan, Purnawan, E. Noor, H. Hardjomidjojo, Irzaman, E. Rohaeti, A. Kurniawan

{"title":"Structural and Electrical Properties of Silica Materials from Rice Husks","authors":"Casnan, Purnawan, E. Noor, H. Hardjomidjojo, Irzaman, E. Rohaeti, A. Kurniawan","doi":"10.29037/ajstd.697","DOIUrl":"https://doi.org/10.29037/ajstd.697","url":null,"abstract":"This study aimed to analyze the structural and electrical properties of silica from rice husks recovered by the process of ashing on a medium-scale furnace with a capacity of 15 kg. Rice husks were burned at a heating rate of 1.5°C /min to a temperature of 900°C, where the temperature was retained for 1 hour each at 400°C and 900°C. The methodology of this research was conducted through the process of ashing, extraction of silica, and characterization of its structural electrical properties. The silica extracted from rice husk ash had a relatively low water content by the low absorption intensity of the group –OH at 3610 cm-1. The silica was dominated more by the siloxane group (Si-O-Si) compared with the silanol group (Si-OH). Based on XRD analysis, the silica structure was confirmed as tetragonal. The silica also had a decreased resistance, impedance, and inductance as the frequency increased. These results indicate that the obstacles contained in silica content decrease with an increase in frequency. The decreasing of dielectric constants was caused by the frequency affecting the capacitance; i.e., increased frequency caused more waves to be transmitted each second. The electric current was turned before the capacitor plate was fully charged, which caused quick charge drainage in the capacitor plate and therefore reduced the ability of a material to store the electric charge.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45220810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Harnessing Multi-label Classification Approaches for Economic Phenomena Categorization 利用多标签分类方法对经济现象进行分类

Asean Journal on Science and Technology for Development Pub Date : 2021-08-30 DOI: 10.29037/ajstd.680

Nofriani, N. Kurniawan

{"title":"Harnessing Multi-label Classification Approaches for Economic Phenomena Categorization","authors":"Nofriani, N. Kurniawan","doi":"10.29037/ajstd.680","DOIUrl":"https://doi.org/10.29037/ajstd.680","url":null,"abstract":"One fashion to report a country’s economic state is by compiling economic phenomena from several sources. The collected data may be explored based on their sentiments and economic categories. This research attempted to perform and analyze multiple approaches to multi-label text classification in addition to providing sentiment analysis on the economic phenomena. The sentiment and single-label category classification was performed utilizing the logistic regression model. Meanwhile, the multi-label category classification was fulfilled using a combination of logistic regression, support vector machines, k-nearest neighbor, naïve Bayes, and decision trees as base classifiers, with binary relevance, classifier chain, and label power set as the implementation approaches. The results showed that logistic regression works well in sentiment and single-label classification, with a classification accuracy of 80.08% and 92.71%, respectively. However, it was also discovered that it works poorly as a base classifier in multi-label classification, indicated by the classification accuracy dropping to 13.35%, 15.40%, and 30.65% for binary relevance, classifier chain, and label power set, respectively. Alternatively, naïve Bayes works best as a base classifier in the label power set approach for multi-label classification, with a classification accuracy of 63.22%, followed by decision trees and support vector machines.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43622926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Assessment of Trace Elements in Soils and Sediments in the Abandoned Mercury Mine Site in Puerto Princesa City, Philippines 菲律宾公主港市废弃汞矿场地土壤和沉积物中微量元素的评价

Asean Journal on Science and Technology for Development Pub Date : 2021-08-30 DOI: 10.29037/AJSTD.682

J. Samaniego, C. R. Gibaga, Alexandria M. Tanciongco, Rasty M. Rastrullo

{"title":"Assessment of Trace Elements in Soils and Sediments in the Abandoned Mercury Mine Site in Puerto Princesa City, Philippines","authors":"J. Samaniego, C. R. Gibaga, Alexandria M. Tanciongco, Rasty M. Rastrullo","doi":"10.29037/AJSTD.682","DOIUrl":"https://doi.org/10.29037/AJSTD.682","url":null,"abstract":"An abandoned mercury mine area in Puerto Princesa City, which was previously operated by Palawan Quicksilver Mines, Inc. (PQMI) from 1953 to 1976, is known for its unrehabilitated open-pit of mercury-rich rocks and exposed mine waste calcine stockpiles in the vicinity. In order to establish an understanding on the geology of the abandoned mercury mine deposit and to obtain clues in determining the possible metal pollutants in the area, measurement of trace element concentrations of soil and sediments collected from the PQMI vicinity were conducted. Soil and sediment samples were analyzed for heavy metals, rare-earth elements and naturally occurring radioactive elements and determined its contamination factor as part of risk assessment. Analytical results showed that aside from mercury, several heavy metals (nickel, chromium, manganese) were found to be anomalous due to the geology of the area. Statistical analyses show that chromium, nickel and antimony present the highest contamination factor among the sampling groups. Mercury is found to have negative bias with higher rare earth elements concentration but positively correlated with arsenic, antimony, and thallium. In general, there is low concentration of rare earth elements (except for scandium) in comparison with its respective average crustal concentration. Due to the nature of geology in the area, naturally occurring radioactive elements influence is also minimal. The results of this study, especially on the assessment of soil and sediment pollutants, are recommended as guidance to its mine rehabilitation.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48488418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Recent Advances in the Use of Transglutaminase in Cheese Production 转谷氨酰胺酶在奶酪生产中的应用进展

Asean Journal on Science and Technology for Development Pub Date : 2021-08-30 DOI: 10.29037/ajstd.675

Warsono El Kiyat, Evlyn Laurenthia, J. MichaelA.

引用次数: 1

Optimum Medium for Lipase Production by Lipolytic Filamentous Fungi Isolated from Kendari Landfill Soil Kendari垃圾填埋场土壤溶脂丝状真菌产脂肪酶的最佳培养基

Asean Journal on Science and Technology for Development Pub Date : 2021-04-30 DOI: 10.29037/AJSTD.644

N. Rayani, Miftahul Ilmi

{"title":"Optimum Medium for Lipase Production by Lipolytic Filamentous Fungi Isolated from Kendari Landfill Soil","authors":"N. Rayani, Miftahul Ilmi","doi":"10.29037/AJSTD.644","DOIUrl":"https://doi.org/10.29037/AJSTD.644","url":null,"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.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46679169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Anticipating Ocean Deoxygenation in the Maritime Continent of Southeast Asia 预测东南亚海洋大陆的海洋脱氧

Asean Journal on Science and Technology for Development Pub Date : 2021-04-30 DOI: 10.29037/AJSTD.630

I. Wulandari, A. J. Wahyudi, K. Triana

{"title":"Anticipating Ocean Deoxygenation in the Maritime Continent of Southeast Asia","authors":"I. Wulandari, A. J. Wahyudi, K. Triana","doi":"10.29037/AJSTD.630","DOIUrl":"https://doi.org/10.29037/AJSTD.630","url":null,"abstract":"SUBMITTED 8 July 2020 REVISED 9 November 2020 ACCEPTED 6 December 2020 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.","PeriodicalId":8479,"journal":{"name":"Asean Journal on Science and Technology for Development","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41294226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3