Authors:Halida Yunita, Nafisah Al Huda, Devi Sundary, Hendra Gunawan, Munira Sungkar, Bambang Setiawan, Dewi Sartika Pages: 1 - 11 Abstract: The Singkil Sub-district of Aceh Singkil District is composed of alluvium deposits with a relatively low ultimate bearing capacity. The ultimate bearing capacity of the soil is closely related to the safety of a building. The important thing related to the estimation of the ultimate bearing capacity of the soil is in-situ soil investigation. This study aims to estimate the spatial distribution of soil ultimate bearing capacity using field test data in the Singkil Sub-district. Estimating ultimate bearing capacity is useful to provide an initial picture for various planning and infrastructure development activities in the study area. Twenty CPT in-situ tests have been obtained from various field works in Aceh Singkil Regency. Field data analysis, based on empirical methods, was carried out to obtain the value of the ultimate bearing capacity of the soil at the test location. Then, the estimated distribution of the ultimate bearing capacity obtained was carried out. The zoning map of the distribution of soil ultimate bearing capacity at the study was developed from this research. This map can be used as a form or effort of disaster mitigation by various stakeholders involved in planning and building various infrastructure facilities in the Singkil Sub-district. PubDate: 2022-04-25 DOI: 10.13170/aijst.11.1.23287 Issue No:Vol. 11, No. 1 (2022)
Authors:Nurul Aflah, Mulkal Mulkal, Muchlis Muchlis, Hendra Harisman, Alisastromijoyo Alisastromijoyo, Mirna Rahmah Lubis, Jessica Anggraini Pages: 12 - 20 Abstract: The environmental impact, both physical and chemical in a mining area is inevitable particularly for open pit mining areas. The impact could affect soil and water quality where mining activities, such as land clearing, blasting, and hauling are taking place. Thus, environmental monitoring in mining areas should be taken to measure the impact of mining activity for reclamation purposes. The objective of this research focuses on the measure of environmental impact on soil quality in term of the nutrient content in an abandoned mine area at Jantang village, Lhoong, Aceh Besar. The research was conducted by collecting 15 soil samples, followed by laboratory analysis using atomic absorption spectrophotometry to investigate sampled soil’s nutrients which are pH, Carbon (C-organic), Nitrogen (N-total), Phosphor (P-availability), and Ferro substance (Fe-concentration). In addition, to estimate the soil properties at locations outside the sampling area, a spatial interpolation method called inverse distance weight with an optimum power was used. The result shows that the soil is acidic, with low C-organic in the range of 0.02%–1.84%, N-total 0.02%–0.16%, and P-availability 0.55%–3.75%. In contrast, the Fe-concentration is very high in the range of 3000–3400 ppm. PubDate: 2022-04-24 DOI: 10.13170/aijst.11.1.23323 Issue No:Vol. 11, No. 1 (2022)
Authors:Darusman Darusman, Syakur Syakur, Eka Kurniasih, Vera Puspita, Zaitun Zaitun Pages: 21 - 28 Abstract: Quality of biochar produced through the pyrolysis process depends on the combustion temperature, duration of combustion, and the raw materials used. Biochar is a carbon-rich product resulting from the thermal decomposition of organic matter. Biochar is made through carbonization with pyrolysis technology. This study analyzed the characteristics of two types of raw materials bamboo and pine wood used as experimental samples. This research was conducted at the Laboratory of Soil and Environmental Physics, Universitas Syiah Kuala. The instrument used is a chamber muffle furnace (thermo scientific thermolyne F4820-33) with a combustion temperature set at 400℃ and 800℃ and a burning time of four hours. Fourier Transform Infra Red (FTIR) was used to characterize the functional groups of biochar tested. Our research showed biochar from pine wood at pyrolysis temperature of 400℃ gave the characteristics of the functional groups OH, CH, and C=O with strong intensity. It indicates that there was decomposition of organic matter into organic compounds taking place. PubDate: 2022-04-25 DOI: 10.13170/aijst.11.1.23437 Issue No:Vol. 11, No. 1 (2022)
Authors:Adi Suryadi, Dewandra Bagus Eka Putra, Husnul Kausarian, Abdul Rahman Sholeh, Malik Tauladani, Adriyadhi Adriyadhi Pages: 29 - 37 Abstract: The sustainability of groundwater has become a serious issue as a water resource needed by society. Therefore, electrical Resistivity Imaging was carried out at Rumbio Jaya, Kampar, Riau to study groundwater aquifer's electrical characteristics. The equipment used is Geocis resistivity meter with (32) multi-electrodes alignment. Wenner configuration electrode applied in this survey. The 2-D Electrical Resistivity inversion results indicate there are three resistivity zones; (1) Low resistivity value (0.0093 – 4.84 Ωm) representing conductive clay; (2) intermediate resistivity value (1.07 – 171 Ωm) indicate as potential aquifer layer; and (3) a high resistivity value (61 – 4000 Ωm) occupying as bolder of rock. All the zones have different thicknesses and depths, but mostly clay layers dan boulders are shown as lenses in the aquifer of the study area. Meanwhile, the aquifer layer is found easily at a depth of 1 meter up to 30 meters. PubDate: 2022-04-24 DOI: 10.13170/aijst.11.1.23714 Issue No:Vol. 11, No. 1 (2022)
Authors:Anwar Fitrianto, Wan Zuki Azman Wan Muhamad, Suliana Kriswan, Budi Susetyo Pages: 38 - 45 Abstract: Outliers identification is essential in a data analysis since it can make wrong inferential statistics. The purpose of this study was to compare the performance of Boxplot, Generalized Extreme Studentized Deviate (Generalized ESD) and Sequential Fences method in identifying outliers. A published data were used in the study. Based on preliminary outlier identification, the data did not contain outliers. Each outlier detection method's performance was evaluated by contaminating the original data with few outliers. The contaminations were conducted by replacing the two smallest and largest observations with outliers. The analysis was conducted using SAS version 9.2 for both original and contaminated data. We found that Sequential Fences have outstanding performance in identifying outliers compared to Boxplot and Generalized ESD PubDate: 2022-04-24 DOI: 10.13170/aijst.11.1.23809 Issue No:Vol. 11, No. 1 (2022)
Authors:Binaee Yaseen Raof First page: 46 Abstract: Urban population growth has affected the spread of residential buildings in many countries. Kurdistan region of Iraq has been witnessing rapid progress in residential complex projects. The energy consumption in buildings, especially residential buildings, is immensely affected by the design of urban open spaces around these buildings. Accordingly, this has contributed to the massive increase in energy consumption. In this paper, through analyzing previous studies, the impacts of each of the urban features of open spaces (aspect ratio, orientation of street pattern, density, and spacing ratio) on both energy consumption and outdoor thermal comfort is introduced. Also, the study is to focus on the criteria of urban features of open spaces in three existing residential projects in Sulaimani city- Iraq by considering that there is a remarkable unawareness of the influence of urban design on microclimate and energy use. Furthermore, direct comparison between the ratios and the optimal settings of urban features of open spaces that contribute to reducing energy consumption in buildings and achieving outdoor thermal comfort for hot dry climate in the context of urban open spaces in residential complexes is done. The comparison shows that aspect ratio for two selected residential projects is below the ideal urban features ratio, and at the same time, density and spacing ratio for all the chosen residential cities is higher than the optimal urban features ratio of open spaces in hot arid climate zone and as a result, the total loads of energy increased PubDate: 2022-04-19 DOI: 10.13170/aijst.11.1.23814 Issue No:Vol. 11, No. 1 (2022)
Authors:Wan Ryan Asri, Hasanudin Hasanudin, Ady Mara, Desnelli Desnelli Pages: 56 - 69 Abstract: Puspa wood sawdust and sugarcane bagasse are abundantly available but have low carbon content and nutrients. The carbon content and nutrients could be increased by converting biomass into biochar through pyrolysis. The independent variables of pyrolysis were essential to investigate because those inherently influence biochar quality. In this study, the effect of pyrolysis temperature (300, 350, 400, 450, and 500 ˚C) and time (30, 60, 90 mins) on the biochar characteristic such as pH, yield, ash content, volatile matter, fixed carbon were determined. The total nitrogen, P2O5, and K2O content at optimum condition biochar were also investigated. The data analysis showed that the increase of pyrolysis temperature and time was positively correlated to the pH, ash content, and carbon content. At the same time, the yield and volatile matter were vice versa. Both biochar's optimum pyrolysis temperature and time were achieved at 500 and 90 minutes, respectively. The carbon content and nutrient of biochar were also increased compared to the biomass. In general, the pyrolysis method has enhanced biomass quality, and the biochar may potentially be used as a growing media and soil amendment. It can be concluded that the sugarcane bagasse biochar was more likely favorable than puspa wood sawdust biochar due to its higher fixed carbon and nutrient content. PubDate: 2022-04-24 DOI: 10.13170/aijst.11.1.25066 Issue No:Vol. 11, No. 1 (2022)
Authors:Cut Mutiawati, Fitrika Mita Suryani, Renni Anggraini First page: 70 Abstract: Traffic congestion that often occurs in many cities, in particular, in developing countries, is mainly due to the excessive use of private vehicle instead of public transport. In order to solve the problem, public transport should improve its level of services to attract more people to use it. Therefore, it is essential to observe to what extent the satisfaction of people on public transport regarding its operation. This research aims to analyze the satisfaction level of bus passengers in Banda Aceh City concerning the expected satisfaction and observed performance. The satisfaction level of passengers was analyzed by using Important-Performance Analysis (quadrant analysis) method. The results showed that people perception on the level of service of Trans Koetaradja buses was still acceptable. However, the arrival and departure time still needs to be improved. Further, a dedicated bus lane planning is incredibly necessary to avoid traffic jam, so that the travel time can be much shorter. In sum, the fleet of operating buses is sufficient and free of charge fares still need to be applied. PubDate: 2022-04-19 DOI: 10.13170/aijst.11.1.23146 Issue No:Vol. 11, No. 1 (2022)
Authors:Ilham Azmy, Jun Wang Pages: 85 - 95 Abstract: The hierarchical CuCo2O4-Ni(OH)2 core-shell nanowire arrays on Ni foam were fabricated using facile and cost-effective two-step hydrothermal synthesis. The growth of CuCo2O4 nanowires was developed on Ni foam as the apposite basis of the conductive scaffold, and the ultrathin Ni(OH)2 nanowires were subsequently immobilized to form CuCo2O4-Ni(OH)2 core-shell nanowire arrays (NWAs). The prepared materials were further characterized in structural, morphological, and electrochemical properties. The obtained CuCo2O4-Ni(OH)2 pseudocapacitor electrode, incorporated by unique core-shell heterostructures nanowire arrays, exhibited great specific capacitance of 1201.67 F g-1 at 1 mA g-1, which is much higher than pristine CuCo2O4 nanowire of 638.89 F g-1 at 1 mA g-1. Simultaneously, it also has a high power density of 5.56 kW kg-1 at an energy density of 73.33 Wh kg-1 and good long-term cycling performance (~84 capacitance retention after 1000 cycles). The improved morphological and structural properties have substantiated the CuCo2O4-Ni(OH)2 core-shell nanowire arrays properties owing to higher surface active area and richer redox activity for boosting the electrochemical properties. PubDate: 2022-04-30 DOI: 10.13170/aijst.11.1.24181 Issue No:Vol. 11, No. 1 (2022)
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