bluuebunny/crossref_metadata_2025_split huggingface dataset:
Landslide investigation using electrical resistivity tomography (ERT) technique at the location of water channel PLTM Lambangan, Pagimana, Central Sulawesi
Authors: Asrafil  , Uno I , Jayadi H , Rugayya S 
Published: January 2020

Abstract
Mass movement phenomena that occur in the research area affect the destruction of water channel in the area of PLTM Lambangan that located at the location. This research aimed to investigate soil movement phenomena in order to determine control factors that causing soil prone to move, especially in the surface geological aspect and underground lithology condition in the research area. Investigation method applied is by underground geologic and geophysical surveys using electrical method, that is Electrical Resistivity Tomography (ERT) with Wenner Configuration. Results of investigation show that geological factors are quite related to the soil movement. Movement phenomena occur in the surface with hilly to steep cut topography (21-55%) with material sourced from alluviation of clastic sediment dan carbonatic rocks. The damaged area is people farming area where fibre root of plant adds water absorption capacity of the soil. Also, sliding materials show water seepage that indicates that the moving slope has been saturated. This condition supported by information from geoelectric survey which indicates that in general the under surface material potent to slide or move because of unconsolidated material with its resistivity values in the order of 16 – 43 m that estimated related to alluvial or saturated residual soil.
Depth estimation of the aquifer layer using the geoelectric resistivity method
Authors: Sastrawan F D , Asrafil  , Prasetya E G 
Published: January 2020

Abstract
At present, the distribution of water received by the ITK campus only comes from the PDAM and often experiences interference. Based on this case, a solution is needed to overcome the limitations of water by finding a layer of aquifers around campus area of ITK. The purpose of this study was to estimate the depth of aquifer and subsurface stratigraphy around ITK using the geoelectric resistivity method with schlumberger configuration. The resistivity geoelectric method is used to determine the subsurface structure based on the distribution of rock resistivity values. The results of the interpretation indicate that the subsurface statigraphy of the study area consists of top soil with resistivity 36.9 Ωm - 558 Ωm, sandy clay with resistivity 16.1 Ωm - 64.9 Ωm coal insertion with resistivity 637 Ωm clayey sand with resistivity 133 Ωm - 174 Ωm, and clay with a resistivity of 2.32 Ωm - 8.27 Ωm. The coal and clay seams are aquiklud, the sandy clay layer is aquitar, and the layer that includes aquifers is clay sand layer. The depth of the aquifer at each measurement point on average has a range from a depth of 56.5 m - 72.8 m is medium to productive aquifer
Flash flood hazard areas assessment in Bandar Negeri Suoh (BNS) region using an index based approaches and analytical hierarchy process
Authors: Wibowo R C , Sarkowi M , Setiawan A F , Yudamson A , Asrafil  , Kurniawan M , Arifianto I 
Published: January 2020

Abstract
Flash flood led to high levels of water in the urban areas, causing many problems such as bridge collapse, building damage and the victim died. It is impossible to avoid risks of floods or prevent their occurrence, however, it is plausible to work on the reduction of their effects and to reduce the losses which they may cause. The objective of this paper is to generate a flash flood map in Suoh region, using satellite images, UAVs images and GIS tools. Analytical Hierarchical Process is used to determine the relative impact weight of flood causative factors to get a composite Flood Hazard Index (FHI). The causative factors in this study are flow accumulation (F), rainfall intensity (I), geology (G), land use (U), slope (S), and elevation (E). The presented methodology has been applied to an area in Suoh region, where recurring flood events have appeared. Initially, FIGUSE method resulted in an FHI and a corresponding flood map. A sensitivity analysis on the parameter’s values revealed some interesting information on the relative importance of each criterion, presented and commented in the discussion section.
Design and build of shaking table prototype as short-period seismometer calibrator based on microcontroller
Authors: Rahman M S D P , Zahara S , Nurjanah M. 
Published: January 2020

Abstract
A seismometer is an instruments used to record ground motion, such as caused by earthquakes. It has a high sensitivity to ground motion, including noise. It’s sensitivity to noise can result in unstable recording, even components damage, therefore calibration is very important to do. Calibration is an activity of comparing instruments with standard instruments ascertained to maintain the quality and quantity of data produced. One of the methods is shaking table that provides ground motion simulation as a seismometer input. This method moves the seismometer with up-down vertical translation. The goal of this study is to design and build a prototype seismometer calibrator using microcontroller-based shaking table method on TDV-23S (Short Period Seismometer with a frequency response of 1-50 Hz). The designed calibrator is divided into the drive (uses stepper motor) and data retrieval system (uses ADXL345 sensor) that used Arduino-Uno as the microcontroller. Instruments testing is done by comparing with BMKG standard calibrators. The comparison results show the difference in structural displacement, 2 mm for the designed instruments and 0.8 mm for the standard calibrator, with signal amplitude difference produced by the designed tool is greater than the standard calibrator.
A field survey for the rupture continuity of Palu-Koro fault after Donggala earthquake on September 28th, 2018
Authors: Abdullah A I , Abdullah  
Published: January 2020

Abstract
The 28 September Mw 7.5 Donggala earthquake has generated the fault trace now able to be seen using satellite image on Google Earth especially in the Palu western zone. However, a field survey must be conducted in order to discover the decisive rupture continuity direction since it inspected not the entire trace for outside Palu areas in contrast. The survey result shows this rupture crosses Sigi, Palu, Palu Bay, and Donggala about 156 km in south-north directed. Yet, some slipping parts experienced dip-slip as oblique fault besides sinistral strike-slip/left-lateral fault type as currently inferred. Moreover, the liquefaction-affected areas were only occurred in the fault border zone such as in South Dolo, Sigi; Balaroa, Palu; and some areas of Donggala. Besides, this event reinforces evidence that Palu-Koro fault trace is the geothermal system components referred to what was happened to the villages of Pulu and Mantikole, Sigi. In sum up, this fault can be categorized as a disaster when significantly active it can cause massive damage to buildings and other infrastructures above the rupture even though the left-right side did not experience the same severe damage, and fatalities struck down by collapsed debris.
Identification of igneous rock distribution in Kalisonggo area using geomagnetic method
Authors: Kurniawan M , Sismanto  , Rugayya S 
Published: January 2020

Abstract
Shallow intrusions of igneous rocks are often found in the Kalisonggo area and form a columnar joint. The presence of shallow intrusions of igneous rocks in the study area is closely related to Mount Mujil as an ancient volcanic system. This study aims to prove the existence of igneous intrusion and subsurface conditions using the geomagnetic method. First Horizontal Derivative (FHD) is used to determine the edge boundaries of the anomalous source of the rock’s magnetic field. Quantitative interpretation is done by using 2.5 D modeling to determine the distribution of igneous intrusion in the study area. The results of data processing show the total anomaly value in the study area has a range of values ranging from -400 nT to 600 nT. Whereas the local anomaly value that has been reduced to the equator has a range of values between 350 nT and the lowest -400 nT with a closed contour closure pattern between the high anomaly and the low anomaly. Based on the cross-section results of 2.5 D incision 1 and 2, there are 3 layers of rock in the presence of boulder lava andesite. The andesite lava has a susceptibility value of 0.00004 SI which penetrates the bedding above it. The top layer is soil with a susceptibility value of 0.00001 SI. The next layer is the andesite breccia rocks with a susceptibility value of 0.00003 SI. The third layer is sandstone with a susceptibility value of 0.000005 SI. The model shows that the andesitic lava lumps did not break through the basement, this is following Van Bemmelen’s opinion that igneous rock in Kalisonggo is an avalanche.
Analysis of statistical models for forecasting PM10 in Kototabang region
Authors: Alfiandy S , Davi R S 
Published: January 2020

Abstract
PM10 is one of the aerosol particles that can endanger human health. This research conducted by forcasteing for PM10 concentration. Forecasting is an activity of estimating or predicting events in the future, therefore it is necessary to do analysis simple statistical model to know goog results. In this case, several forecasting models are used for the daily PM10 concentration in Kototabang, that is Liniear, Quadratic, and Exponential Trend Model. As the results of this research, monthly forecasting using Linear Trend Model has the highest correlation value in October (-60) with MAD value 0.254, MSE 0.0651, RMSE 0.255, and MAPE 1848.8. Monthly forecasting using the Quadratic Trend Model has the highest correlation value in February (+0.52) with MAD value 0.013, MSE 0.0002, RMSE 0.015, and MAPE 103.934. then, for monthly forecasting using the Exponential Trend Model has the highest value in October (+0.61) with MAD value 0.124, MSE 0.0154, RMSE 0.124, and MAPE 893.484. the output of the forecasting model obtained the best model for forecasting the daily PM10 concentration in Kototabang i.e by using a simple statistical model, linear trend model.
Modeling of daily PM2.5 concentration based on the principal components regression in South and Central Jakarta
Authors: Alfiandy S , Virgianto R H , Putri A S 
Published: January 2020

Abstract
Jakarta as a megacity, has many roles in the distribution of PM2.5 pollutant concentrations, especially from the activities of vehicle users. This research estimates daily PM2.5 concentration from January to June 2018 at two points, each in the South Jakarta and Central Jakarta based on the principal components regression from daily averaged air temperature, rainfall, relative humidity, and surface wind speed. We retained the first three in principal components to account for over 90% of the variance in the climatological variables. The results show the daily concentration of PM2.5 in South Jakarta has the highest correlation coefficient of 0.32 in March 2018 with a p-value of 0.079 and MAE value of 10.28. Meanwhile, Central Jakarta has the highest correlation coefficient of 0.46 calculated from daily PM2.5 estimation in January 2018 with a p-value of 0.013 and MAE value of 8.27. Based on verification results at the two observation points from January to June 2018, it can be concluded that the estimation of the daily PM2.5 concentration based on the principal component regression method in the South Jakarta showed slightly better than in South Jakarta.
The use of anomaly data in identifying faults in Sedoa village, Poso district
Authors: Rusydi M , Fulansyah  , Efendi R , Rahmawati  
Published: January 2020

Abstract
A magnitude (Mw) 6.6 Earthquake occurring on 29 May 2017 in Poso shows that there are active faults in these regions. In addition to Palu-Koro fault which is the major fault in the island of Sulawesi, one of secondary faults that may trigger earthquakes is a fault in Lore Utara Subdistrict, Poso District. This fault has been identified using magnetic anomaly in Sedoa Village Lore Utara Subdistrict. A measurement was done to obtain magnetic field intensity data and measurement time at base stations and position data at mobile stations. The data obtained was subjected to IGRF correction and diurnal variation correction. The result of the research shows different susceptibility (k) values with 0.00017 SI for clay rocks, 0.0209 SI for muddy sandstone, and 0.05 SI for granite rocks. This research also shows the existence of subsurface geological structures in Sedoa Village, Poso District, in the form of two normal faults in different directions. The first fault runs from Southeast toward Northwest and the second one runs from Northeast to Southwest.
A Microcontroller-Based Sonometer
Authors: Ulum M S , Asumarau F , Musa M D T , Sesa E , Mahmudin L , Badaruddin  
Published: January 2020

Abstract
It has been designed and made a sonometer device that uses a microcontroller and LM567 frequency sensor module. The sound from the sonometer strings is detected by the module sensor. If the module sensor detects that the string sound frequency is the same as the tuning fork frequency, the microcontroller will display the word “Sesuai” on the monitor screen (LCD) which means the string frequency is equal to the tuning fork frequency. Conversely, if the frequency of the strings sound is not the same as the frequency of the tuning fork, the microcontroller will display the word “T Sesuai” which means the frequency of the strings is not the same as the tuning fork frequency. Compared to the conventional sonometer, this sonometer (the modified sonometer) produces more accurate frequency values. In this study, the maximum relative error of the modified sonometer is 0.30% while the maximum relative error of conventional sonometer is 10.86%.
Experimental study of thermoelectric refrigerator performances: effect of air flow direction on the ribbed plat-fin heat sink at cold side of TEC
Authors: Kennedy  , Muis A , Basri  , Mustafa  
Published: January 2020

Abstract
This study aimed to investigate the effects of the direction and flow rate of air in the heat sink to the performance of the thermoelectric coolers (TEC). A ribbed heat sink is placed on the cold side of the TEC as a heat exchanger component in the Styrofoam cooler box, while a water block placed on the hot side of TEC, the temperature, and flow rate of coolant is maintained constant. Airflow on the heat sink in the cooling room has been varied by two different types of fan modes; blowing and sucking. Air velocity is also varied for both flow conditions. The investigation showed that the sucking mode of fan at the lowest speed of airflow would generate the lowest temperature of the cooler compared with the other combinations of fan modes and speed of airflows. Based on these results, showed that the fan mode and velocity of an airflow across the heat sink affect the thermoelectric performance.
Students’ perceptions of learning processes in schools affected by earthquakes and liquefaction in Central Sulawesi
Authors: Saehana S , Werdhiana I K , Gustina  , Adriansyah  , Izzah A 
Published: January 2020

Abstract
The purpose of this study is to determine students’ perceptions of the learning process in schools affected by earthquakes and liquefaction that occurred on September 28, 2018, in Central Sulawesi. This descriptive study was carried out on July 25 s.d. August 3, 2019. The selected disaster-affected schools were SMP Negeri 10 Palu, MTs 3 Palu, and MTs Al Khairaat Biromaru. The respondents of this study were 30% of the total students in each of these schools. Where sequentially respondents from MTs Negeri 3 Kota Palu, SMPN 10 Palu, and MTs Al-Khairaat Biromaru were 90, 100 and 40 people. The data in this study were obtained through a questionnaire of perception with eight questions. Each question in the questionnaire has four alternative answers. From the results of the questionnaire analysis at the three schools, it was found that students stated the learning process was in the inadequate category. This is due to psychological factors, service, teacher quality as well as poor facilities and infrastructure after the natural disaster. Thus it can be said that natural disasters in the form of earthquakes and liquefaction that occur cause a decrease in the learning process at school when viewed from students’ perceptions.
The effects of durian skin ash concentration in methanolysis reaction of palm oil on fatty acid methyl esters concentration
Authors: Said I , Nuryanti S , Tiaradewi T R , Ningsih P 
Published: January 2020

Abstract
Biodiesel is an alternative fuel made by methanolysis reaction of palm oil. Methanolysis reactions require a catalyst to accelerate the biodiesel formation reaction. The catalyst used in this study was the durian skin ash. This study was conducted to determine the effect of durian skin ash concentration on fatty acid methyl ester content that result in the reaction of palm oil methanolysis. Durian skin ash concentrations were varied to 1%, 2%, 3%, 4% and 5%. The methanolysis reaction was carried out by mixing palm oil, methanol and the ash of calcined durian skin at a temperature of 800°C for 5 hours. The reaction mixture was heated at a temperature of 50 to 70°C for 2 hours. The results of this study showed that the fatty acid methyl esters content increased with the concentration of durian skin ash up to 4% i.e. 90.03%. Fatty acid methyl esters content decreased on the durian skin ash concentration of 5% i.e. 85.66%. These results indicate that the fatty acid methyl esters reached the optimum content in 4% concentration of durian skin ash.
Estimation of ordinary kriging parameters for determining characteristics and distribution of groundwater layer in Tondo area, Mantikulore district, Palu
Authors: Nur’eni  , Jamidun  , Setiawan I , Suaib N M 
Published: January 2020

Abstract
Tondo area as a research location is one of Palu area. The topography of this area besides sloping and interspersed with hilly areas is also a barren and critical groundwater area. Geologically, the rock structure that comprises this area consists of Molasa Celebes deposits namely clay, sand and gravel. So far, clean water in the Tondo area has been supplied by the Palu City Regional Drinking Water Company (PDAM) from the surface water source in Kawatuna area. There is also a PDAM Donggala that supplies clean water to this area which is sourced from groundwater. However, the water source is quite deep at around 150 m besides that the depth of groundwater position varies based on the results of groundwater drilling in this region and groundwater cannot always be found. If these results are followed up with Ordinary Kriging research using a Semivariogram to find groundwater, the results are expected to be better and more accurate. Based on the research results obtained that: The best model is the Spherical model with the smallest MSE value of 429.5016 and the resulting parameter values are nuggets = 15.70937, sill = 28.46195, and range = 3343.121. The deepest depth is 23.07785 m.
Introduction of nanoparticle magnetic development as transfer medium at mung bean seeds (virginia radiata l.) using soaking method
Authors: Syamsu  , Saehana S , Darmadi I W , Zaky M , Arjo S , Hidayat M N , Suminten N , Nurjanati B , Husain S 
Published: January 2020

Abstract
It has been done research about a nanoparticle magnetic distribution into seeds of Vigna radiata L. seeds and the growth of their sprouts including their roots and stems using the soaking method. their nanoparticle magnetics are the synthesis result of natural iron sands using co-precipitation method. The truth of the nanoparticle magnetic has been shown trough the function of bonding groups at wavenumber 698 cm-1. This research has been done as a foundation for further development in the genetical modification. Next, the experimental results show a good diffusion in the seeds, so that, along the development, the nanoparticle magnetic could be found in the roots and stems. Therefore, this research study is possible to be advanced to control plant growths and their genetical modifications.
Vegetable and food crop production with micro climate modification
Authors: Hadid A , Toknok B , Wardah  , Zulkaidhah  
Published: January 2020

AbstractVegetable and food crops generally require optimum light intensity so that most of these plants are cultivated monoculture. This research has tried to produce food and vegetable crops in the planting system with a perennial crop. This might be a solution to land limitations, and opportunity modification for the cultivation of food crops and vegetables in sites that tend to be shaded and less light intensity. This research was carried out in Nokilalaki Subdistrict which is directly bordered with the conservation area, i.e. Lore Lindu National Park. The study was designed in factorial design method of randomized block design, that consists of two factors, such as food crop species (tomatoes, chillies, sweet potatoes, taro) and pruning degrees of perennial crops (low pruning/25% of light intensity, moderate pruning/50% of light intensity, and heavy pruning/75% of light intensity. The results showed that the highest crop production was provided on sweet potatoes yield of 18.5 tons ha−1at 50% of light intensity, but was not significant different in 75% of light intensity (17.1 tons ha−1). Tomato and taro yield was not significantly different between all light intensity. So tomatoes and taro might be introduced into a variety of microclimate conditions.
Effect of rain characteristics on rain erosivity in Banggai Regency, Central Sulawesi, Indonesia
Authors: Nugraha Y W , Verawati A , Sutapa I W 
Published: January 2020

Abstract
Rain characteristics are important characteristics to know and predict their response to overall climate change. The purpose of this study is to determine the characteristics of rain and its effect on the erosivity of rain and to make a relationship between rain erosivity and rain. The method used is the rain pattern, the nature of rain, rain erosivity, and double linear lines. The analysis was carried out using rain data at Singkoyo and Waru Stations with observation periods from 1997-2017 (21 years). The calculation results show that the rain characteristic is patterned C or opposite of A pattern; rain characteristics greatly affect the size of the rain erosivity; BN, N and AN values are not the same for the two rain stations because they are strongly influenced by the statistical parameters of the rain; multiple regression equations for Singkoyo Station, ET0 = 8,890 + 18,681 Rmonth - 21,594 N + 5,574 Rmax and for Waru Station, ET0 = -29,163 + 10,581 Rmonth - 6,150 N + 13,156 Rmax.
Development of sorting waste game android based for early childhood in environmental education
Authors: Rahmayanti H , Oktaviani V , Syani Y 
Published: January 2020

Abstract
Waste is one of existing environmental problems have never end. One of the causes was a lack of environmental awareness because lack of education from early age. This study aimed to build Sorting Waste Game Android Based as an education media, study used technology in environmental education. Sorting Waste Game teach early childhood to understand many kinds of waste (organic and an organic) and adjusted waste based on garbage box on environmental. This game application used Android Platform which build using Unity 3D game engine. This study used Research and Development (RnD) method with Waterfall Development Model which consist of 4 steps, are analysis, design, implementation and testing. Testing method used is black box testing to test functional interface application systems thoroughly. Data collection is done using the survey that has been tested its feasibility by experts using Likert scale. Based on testing black box that has been carried out got that all indicator which is with such questions at each item was declared good with the percentage 100 %. This means that Sorting Waste Game is user friendly and can be used and runs smoothly on a platform android as a medium of technology on learning of environmental education.