bluuebunny/crossref_metadata_2025_split huggingface dataset:
The effect of fermentation without or with lactic acid bacteria and storage time on the phytic acid, in vitro dry matter digestibility, and nutrient contents of rice bran
Authors: Marsetyo  , Sulendre I W , Mustaring  , Pamulu M 
Published: February 2021

Abstract
Storage of rice bran (RB) at anaerobic conditions is the potential way to reduce phytic acid (PA) and stabilize the nutrient contents. This study was aimed to examine the effect of fermentation without or with lactic acid bacteria (LAB)) and storage time on the PA, in vitro dry matter digestibility, and nutrient content of RB. A factorial completely randomized design was used in this study. The first factor was the fermentation method, RB with no fermentation (M0), with fermentation without LAB (M1), with fermentation plus LAB (M2). The second factor was storage time, namely 0 (S1), 5 (S2), 10 (S3), and 15 (S4) weeks. Each unit was repeated 4 times. Parameters measured include phytic acid (PA), in vitro dry matter digestibility (IVDMD), crude protein (CP), and crude fiber (CF) contents. A two-way analysis of variance was employed to determine the significant effect of the treatment. For PA the interaction between method and storage time and the main effects were all significant (P < 0.01). For IVDMD, only the fermentation method affected significantly (P < 0.05), with M0 as the lowest and M2 as the highest at all storage time. However, the CP content of RB was not affected significantly (P > 0.05) by treatment. In addition, the CF content of rice bran was not significantly (P > 0.05) affected by an interaction between method and storage time but significantly reduced (P < 0.01) by the method of fermentation. It was concluded that fermentation with the addition of LAB anaerobically decreased anti-nutrient content, increased the feeding and nutritive value of RB.
Analysis of seasonal variability of wave height in Makassar Strait
Authors: Labania H M D , Mudin Y , Rahman A , Sabhan  , Pranowo W S 
Published: February 2021

Abstract
This study was conducted to examine spatially the seasonal variability of sea wave characteristics in the Makassar Strait waters by utilizing the third generation wave model, MIKE 21 Spectral Wave Model. The study was conducted by observing seasonal variability of sea wave height in Makassar Strait waters for 10 years. The data used are wind data predicted by ECMWF every 6 hours during the period 2006 - 2015 as the main input of wave energy generation. The domain model is adjusted to the wind configuration in a uniform grid size of 5’ x 5’ which is considered to be sufficient to represent the bathymetry of the Makassar Strait waters with location limits of 1,00 0LU - 3,98 0LS and 116,15 0BT - 120,30 0BT and 15 stations. Based on the results of the study, showed that high waves occur in the west season which tends to follow the monsoonal pattern according to the local climate type. The maximum significant wave height tends to occur in the western, central and southern waters of the Makassar Strait with an average observed in the middle of the year in the June, July and August periods (east monsoon). For the study of coastal waters, maximum wave height fluctuations tend to be uniform.
Determination of rock dynamics characteristics using microtremor array measurement data (A case study: Biromaru Sigi Region, Central Sulawesi)
Authors: Efendi R , Rusydi M , Syamsuddin E , Rahman A , Hamzah A , Vilia  , Fatwa  , Ismail  
Published: February 2021

Abstract
The Biromaru area is located on the Palu-Koro fault line so it is very prone to earthquake shocks. This area is one of the zones that experienced destruction and caused heavy damage to settlements and various infrastructure. In an effort to mitigate seismic disasters, it is necessary to carry out studies related to rock dynamics in the area. This study was conducted with the aim of knowing the dynamic characteristics of rocks using micro tremor data. The dynamic characteristics of the rock are determined based on several parameters, including the average speed of the shear waves at a depth of 30 meters, and amplification factor. The results showed that this area has a type of still rock structure. Thus, the study area has a high susceptibility to damage due to earthquakes.
Sequences analysis and phylogenetic of leukemia DNA
Authors: Lusiyanti D , Nacong N , Irawan M I 
Published: February 2021

Abstract
DNA is one part of a biological sequence other than RNA and protein. DNA is a nucleic acid that stores all the unique biological information of every living thing and several viruses. Someone who has an illness can be seen in the structure of the DNA which can then be compared with other DNA structures. This process is part of sequence analysis which is the core of bioinformatics. This study aims to analyze the results of sequences alignment of cancer. The sequence was obtained from DNA leukemia taken from GenBank (www.ncbi.nlm.nih.gov). In the sequence analysis, the most basic thing is the sequence alignment. Alignment results can provide information about the level of similarity in the structure of the two sequences. This study will apply the Super Pairwise Alignment method that is implemented in JAVA-based programming languages. Alignment results are carried out by giving different values of gap penalty and gap extend. The results of the study obtained different alignment values, this proves that there is a significant effect of the selection of core parameters used in alignment.
Effect of thermoelectric placement on the commercial waterblock to the liquid cooling system performance
Authors: Kennedy  , Anwar K , Muis A , Basri B , Ilhamsyah M 
Published: February 2021

Abstract
Thermoelectric liquid cooling systems have been widely used to maintain the temperature of electronic devices due to their small size, compactness, and simplicity. A few of these cooling systems utilize the waterblock as a liquid heat exchanger. This study aims to determine the performance of a thermoelectric-based water cooling system in a commercial waterblock. The research was conducted in the laboratory using a 4x12 cm aluminium waterblock placed on the cold side of TEC1-12715. Three variations of thermoelectric placement have been carried out; at the inlet and outlet, in the middle, and the end of the waterblock. The temperature of the coolant and the flow rate of the cooled fluid are kept constant for these variations. The results showed that the thermoelectric position on the waterblock affected the rate of reduction in fluid temperature and the cooling system’s performance.
The sensitivity of Covid-19 spread model parameter: an effort to point out the importance of the detection program
Authors: Ratianingsih R , Hajar H , Rahmah A A , Jaya A I 
Published: February 2021

Abstract
The pandemic of covid-19 has been spread in entire the world. Unfortunately, some regions in Indonesia are ignoring the detection program as an important prevention in control the disease. This research notice some parameters that play a role in the behaviour of covid-19 spread model. The parameters describe the level and rate of the transition and interaction behaviour of the variables, the number of susceptive, unsympthom, quarantined, infected and recovered population with respect to time. The reproduction number, governed from the matrix generation of the mathematical model, shows that the parameters determine the disease spread status. The mathematical model is governed from the disease spread diagram that derives a nonlinear partial differential equation system. The reproduction number is nothing but the thresh hold of the spread disease. To keep the disease spread to be controllable, the reproduction number of the model have to be arranged less than the thresh hold. The appearance of the parameters interpret that the detection program in important to be pointed out.
Study of reducing Chromium (VI) to Chromium (III) ion using reduction and coagulation methods for electroplating industrial waste
Authors: Azis M Y , Amedyan N N , Hanefiatni  , Suprabawati A 
Published: February 2021

Abstract
The electroplating industrial waste is the primary source of environmental pollution due to heavy metal chromium (VI). The method commonly used in treating chromium (VI) metal waste in industry is by reduction and coagulation. Chromium (VI) metal is very toxic because it is very unstable compared to chromium (III). Therefore, chromium (VI) waste must be reduced to chromium (III) before it will be discharged into the environment. The purpose of this study is to find the optimum conditions in reducing levels of chromium (VI). The method used is reduction with sodium metabisulfite, coagulation with Polyaluminium chloride (PAC), and a combination of both. The percentage of reduction obtained in the reduction, coagulation, and combined methods is 96.36%; 20.57%; and 98.57%, with the optimum dose of reducing agents and coagulants of 330 mg/L and 300 mg/L. The best method to reduce the level of chromium (VI) is the combined method at a percentage reduction of 98.57% with a standard deviation of 0.0046 and %RSD of 0.43%. The electroplating waste has reduced percentage until 98,39% at using combination methods.
Leaching of limonitic nickel from Sorowako with sulfuric acid at atmospheric pressure
Authors: Safitri N , Mubarok M Z , Meidji I U , Hardi J , Jayadi H 
Published: February 2021

Abstract
Indonesia has the largest nickel laterite reserves in the world that it plays an important role in fulfilling the demand for stainless steel, nickel-based alloys, and the issue of using electric cars in the future. Currently, low-grade nickel laterite ore has not been maximally processed into value-added products domestically. The extraction process that is widely applied in the industry for low-grade laterite nickel ore through the hydrometallurgical route, which is the leaching method at atmospheric pressure in a sulphuric acid solution. The characterization of nickel ore from Sorowako has been studied that included water content analysis, sieve analysis, XRF analysis, XRD analysis, and leaching in sulphuric acid solution with agitation method at various leaching times. The results showed that the nickel ore sample from Sorowako had a water content of 5.51% with a dominant size fraction of -4 +14 mesh. XRD and XRF analysis results have shown that the chemical compositions of laterite nickel from Sorowako were Limonitic type of goethite (FeOOH) and quartz (SiO2) with the content of Ni, Co, Mg, and Fe of 1.5%, 0.02%, 0.05%, and 23.82%, respectively. The highest percentages of nickel and iron extract that were obtained at the 12 hour leaching time were 90.01% and 97.11%, respectively.
Near-surface evaluation of Bora office area using MASW methods on land-streamer
Authors: Muin M R , Kurniawan M , Musa M D T , Winata E , Batalipu A I , Sahabuddin  , Alfayed F , Marwah S , Anjarsari R , Maulana M I A 
Published: February 2021

Abstract
A limited seismic investigation of the Bora Office Area, was conducted using multiple seismic methods including multi-channel analysis of surface waves (MASW), using land streamer originally designed by the author. The main feature of the land streamer tool is the non-stretch woven belt on which geophone units are mounted to form a multichannel geophone array similar. As a result, it was concluded that it might be possible to avoid higher-mode contaminantion at low frequencies at sites with hight (Vs), it can be seen that the distribution of Vs values varies over the range of 240 m/s to 420 m/s. In general, can be divided into 2 layers based on the value of Vs 100 - 250 m/s as soft rock and > 250 m/s as hard rock. There is a soft rock at a depth range of 0 to 5 m with a velocity value of 140-260 m/s, and hard rock layers at a depth range of below 5m with a velocity value of 280 - 400 m s.
Modelling the number of HIV/AIDS in Central Sulawesi
Authors: Utami I U , Setiawan I , Daniaty D 
Published: February 2021

Abstract
The spread of HIV/AIDS in Central Sulawesi is centralized and spreads in certain districts or cities so that there are indications of a spatial effect in the spread of HIV/AIDS. Geographically Weighted Negative Binomial Regression (GWNBR) is one of the right solutions for modelling the relationship between response variables and explanatory variables on counted data that is local for each observation location with overdispersion and the influence of location or spatial aspects on the data. Spatial aspects can be caused by geographic, socio-cultural, economic conditions, as well as different people’s knowledge between regions. Overdispersion is a condition where the variance of the data is greater than the average data. This study aims to determine the GWNBR model and the factors that influence the number of HIV/AIDS cases in the province of Central Sulawesi. The obtained result based on GWNBR model shown that the districts with the most number of districts that have the most significant similarities in variables are divided into nine subdistrict groups. Factor affecting the number of HIV/AIDS cases in Central Sulawesi Province in 2018 was population density.
Sediment thickness mapping and soil classification using ellipticity inversion of Rayleigh wave in the eastern part of Mataram City, Indonesia
Authors: Meidji I U , Rusydi M , Asrafil  , Jayadi H , Safitri N 
Published: February 2021

Abstract
A soil’s dynamic characteristics greatly influence earthquake potential damage inland. Subsurface investigations to determine the dynamic characteristics of the soil can minimize the risk of such damage. The sediment layer thickness is one of the parameters to assess the local geological character in response to an earthquake. Another parameter is Vs30 value, which is used to classify soil types as an indicator of soil response, which generally dominates ground motion amplification. In this study, the two parameters are analyzed to determine the potential for local damage in the event of an earthquake in the eastern area of Mataram City using the rayleigh wave inversion from microtremor data. The research area covers 3 districts, including Selaparang, Cakranegara, and Sandubaya Districts. The results showed that the value of the sediment thickness in the entire study area ranged from 12.78 m to 57.20 m. The value of Vs30 varies between 286 m/s to 866 m/s with the classification of rigid soils, very dense soils, and soft rocks and rocks. These results indicate that the study area in general experiences a large potential for damage if an earthquake occurs. This research is expected to be a reference for the spatial plan of Mataram City.
Analysis of calcium levels in beef bones from kaledo waste
Authors: Supriadi S , Rahmawati S , Aminah S , Ningsih P , Hastuti S , Said I , Setyawati A 
Published: February 2021

Abstract
Kaledo is one of the special culinary from Central Sulawesi which containing beef bones. The large number of restaurants that provide kaledo in their menus resulted in the amount of beef bone waste that cannot be consumed. This waste can cause environmental problems. However, the bones have the number of minerals, one of them is calcium (Ca). Ca is a mineral that is needed by the body in maintaining body functions. This study aimed to determine the calcium levels in beef bones from kaledo waste which was taken randomly from the kaledo restaurant in Palu. Determination of calcium levels in beef bones from kaledo waste used atomic absorption spectrophotometer. The results of the analysis showed that the water content was 4.5950%, and the ash content was 61.7424%. The analysis of calcium levels measured at a wavelength of 422.7 nm was 19,6800 mg/L. The results of this study are expected to be a source of information about the levels of calcium contained in cow bones from kaledo waste, and it can be used further as a substance in the utilization of beef bones from kaledo waste as a food that can meet the body’s need for calcium intake in preventing stunting.
Application of geoelectrical methods for estimating the availability of shallow aquifer layers
Authors: Sastrawan F D , Romadhon W 
Published: February 2021

Abstract
Kalimantan Institute of Technology (ITK) is the only institute of technology in Kalimantan with an area of ±300 Ha. Most of the area of ITK is not built yet. The increasing of interests of people to study in ITK causing the institute to build more lecture facilities to fulfil the people’s interests. Along with its development, it needs an independent clean water resource. The main source of clean water is groundwater. The potential of groundwater in its unbuilt area can be known by using geoelectrical method measurement. Geoelectrical method could give an early representation of the earth’s subsurface condition based on the resistivity parameter. This research produced a 1D cross section of the earth’s subsurface resistivity. Based on the result, it is known that the land cover is a red-yellow podzolic and clayey sand with the resistivity value of 300 – 570 Ωm and 2 – 4 meters of thickness. The second layer is a layer of water-saturated clay associated with low resistivity values of 15 – 44 Ωm with 20 meters of thickness. The third layer is a clayey sand layer which is estimated as aquifer layer in the depth of 9 – 24 meters. There is also an anomaly of coal inserts at VES_1 measurement point in the depth of 17 meters with a resistivity value of 962 Ωm.
Electrochemical performance of carbon paste electrode modified TiO2/Ag-Li (CPE-TiO2/Ag-Li) in determining fipronil compound
Authors: Nurdin M , Arham Z , Rasyid J , Maulidiyah M , Mustapa F , Sosidi H , Ruslan R , Salim L O A 
Published: February 2021

Abstract
Electrochemical studies in detecting persistent organic pollutants (POPs) have attracted a lot of interest from researchers, especially the carbon paste electrode (CPE). The research objectives were to determine the electrochemical characteristics of TiO2/Ag-Li on the CPE in the system Fe2+/Fe3+ and determine the fipronil in solution. TiO2/Ag-Li preparation was carried out by using the sol-gel method. Electrochemical performance of CPE was applied by cyclic voltammetry. The system developed was a reversible redox reaction and have peaks Ipa 110 µA and Ipc 105 µA. We also found that the composition of the best modifier addition to CPE was using TiO2/Ag-Li with a mass of 0.005 g. The optimum scan rate for the measurement of the fipronil test solution was obtained at 0.2 V/s with an Ipa value of 15 µA and an Epa value of 0.40 V. Based on the plot between the root scan rate and the oxidation current of the solution containing fipronil, the obtained R2 value was 0.9806. This research provides the development of modifier CPE material with the well electrochemically performance and considered as a very effective monitored system for the environment contaminated by POPs waste.
Antimicrobial activity of secondary metabolite compounds from lichen Teloschistes flavicans
Authors: Maulidiyah M , Suilowati P E , Musdalifah A , Kusmalwaty T , Imran I , Azis T , Watoni A H , Hasan A , Salim L O A , Nurdin M 
Published: February 2021

Abstract
Exploration of lichen natural compounds has attracted a lot of attention from researchers as potential medicinal raw materials because chemical compounds contained in lichen have many properties. The potential for developing secondary metabolite compounds of lichen has become a trend for various benefits, for example, in cosmetics, agriculture, health, and food. Lichen Teloschistes flavicans was a concern to study because there were not many reports of secondary metabolites that have antimicrobial activity. The research objective was to examine antimicrobial activity using 3-[1’-(2”,3”-dihydroxy-phenyl)-propyl]-7hydroxy-chroman-4-one compound from lichen Teloschistes flavicans. The antimicrobial activity test was a well diffusion method. Bioactivity was determined by calculating the clear zone formed around the well. Antimicrobial activity testing indicated the inhibition of bacterial growth at a concentration of 500 ppm and 1000 ppm with the respective inhibition zones namely E. coli (10-11 mm), S. Typhi (2-5 mm), K. pneumoniae (11-13 mm), and S. aureus (10-13 mm). Also, B. cereus bacteria and C. albicans fungi were only inhibited at a concentration of 1000 ppm with an inhibition zone of 6 mm each. This research provides scientific knowledge about the potential development of lichen T. Flavicans as an antimicrobial.
The effect of calcogenate sulfur on the performance of the S-TiO2/Ti electrode as a photoelectrocatalytic sensor for phenolic compounds
Authors: Muzakkar M Z , Azis T , Rajiani M S P , Maulidiyah M , Irwan I , Mustapa F , Salim L O A , Nurdin M 
Published: February 2021

Abstract
The TiO2/Ti and S-TiO2/Ti electrodes are effectively prepared using the anodizing process. The objective of this analysis is to determine the characteristics of the S-TiO2/Ti electrode and its efficiency as a photoelectrocatalytic sensor device. The composite electrode of S-TiO2/Ti was prepared using the Ti plate anodizing method in glycerol and NH4F 0.27 M with a bias potential of 25 V for 4 h followed by calcination at 500 °C for 90 minutes. Doping S to the TiO2/Ti electrode was carried out in sol-gel containing sulfur by the dip-coating process and then calcined for 10 minutes at 150 °C. The obtained TiO2/Ti and S-TiO2/Ti electrodes are characterized by UV-Vis DRS, XRD, SEM-EDX, and FTIR techniques. TiO2/Ti was shown to be active under UV light, while S-TiO2/Ti was active under visible light. We also observed that the best composition of the S-TiO2/Ti electrode was 1 M with a current value of 5.71x10−5 A in the visible area. The S-doped TiO2/Ti electrode photoelectrocatalytic activity was stronger than the undoped electrodes under visible light area irradiation.
Trends in composition and density of marine litters on the Mamboro Beach
Authors: Putra A E , Sulistiawati D , Safir M , Mansyur K , Rizal A , Serdiati N 
Published: February 2021

Abstract
The coastal zone is an intermediate area between land and sea which is very vulnerable to being contaminated by litters. The density and composition of marine litters is strongly influenced by environmental factors and human activities. The research objective was to monitor trends in composition and density of litters on the Mamboro Beach in 2019 and 2020. The sampling method is based on marine litter guideline monitoring formulated by the Ministry of Environment and Forestry which was adopted from UNEP and NOAA. The results showed that the total litter weight for macro size (> 2.5 cm) has decreased by 4303.29 g (56.23%) from 2019 to 2020. Likewise, meso size (0.5-2.5 cm) has decreased by 902.25 g (18.42%) from 2019 to 2020. Meanwhile, both litter sizes have increased in density for macro size by 14.12 pieces/m2 and meso size by 18.92 pieces/m2 from 2019 to 2020. The decline in the trend of macro and meso litter in 2019-2020 period is not always directly proportional to the litter density on the Mamboro beach. Apart from anthropogenic and infrastructure factors, geomorphological characteristics, weather conditions and oceanographic parameters also have an influence on the composition and density trends of litter in coastal areas.
Printing of PEDOT:PSS for top gate organic thin film transistor
Authors: Darwis D , Sesa E , Elkington D , Sharafutdinova G , Lewis T , Zhou X , Dastoor P C. , Belcher W J. 
Published: February 2021

Abstract
This report present a thorough discussion of the DOD inkjet printing technology, including technical skills and information about Dimatix inkjet printer employed for the realisation of devices. The use of inkjet printing for the deposition of the conducting polymer PEDOT:PSS was successfully demonstrated for top gate electrode organic thin film transistors. This investigation offers a significant contribution in order to the efficient fabrication of OTFTs.