bluuebunny/crossref_metadata_2025 huggingface dataset:
Coal quality characterization in East Kalimantan Province, Indonesia: review from proximate, ultimate and calorific value analyses
Authors: Rahman R , Widodo S , Azikin B , Tahir D
Published: May 2020

This study discussed the characterization of the different qualities of coal in Kalimantan. The chemical and physical characterization of Kalimantan coal aimed to find the level of coal quality through proximate, ultimate and calorific value analysis. Based on the results of the study, the coal obtained from PT. Kideco Jaya Agung (KJA) had a moisture content of 17.86%, a fixed carbon of 36.56%, ash of 2.94%, volatile matter of42.64%, carbon of 44.86%, sulfur of 0.079% and calorific value of 4468.65 cal/gram. PT. Indemix Coalindo (IC) had coals with the moisture content of 25.94%, fixed carbon of 32.48%, ash of 3.78%, volatile matter of 38.26%, carbon of 45.03%, sulfur of 0.436% and calorific value of 4462.67 cal/gram. Based on the results of the study, the efforts were needed to improve the quality of coal so that the coal collected could become an alternative energy-source with its highest quality and calorific value. Thus, it could compete in the international market.
Biomass analysis and carbon reserve on some cocoa planting systems in Bantaeng district
Authors: Asrul L , Mustari K , Kaimuddin  , Faradilla L
Published: May 2020

Cocoa plantations have ecological functions as carbon sinks and depositors. Cocoa absorbs CO2 during photosynthesis, then converts it to carbohydrates by storing it in the form of biomass in roots, trees, and leaves. The purpose of this study was to determine the carbon uptake of cocoa trees and tree growers, undergrowth, necromasses, carbon uptake at the root and carbon uptake in soils in several cocoa planting systems implemented in Bantaeng Regency, South Sulawesi. Sampling is done by a purposive sampling method with the basic consideration of the type, density and cropping system applied. Biomass estimation is used the non-destructive method by measuring the diameter at breast height (DBH, 1.3 m) and height of cacao and shade plants. Carbon storage in cocoa plants is distinguished by several cropping systems, namely K1 (monoculture harvesters) and K2 (multistrata harvesters). The results showed that carbon reserves in Bantaeng Regency were 32.38 tons/Ha.
Frequency stability and under frequency load shedding of the Southern Sulawesi power system with integration of wind power plants
Authors: Arief A , Nappu M B , Sultan A
Published: May 2020

The Government of Indonesia is encouraging investments in renewable energy based power plants in Indonesia, including wind power plants (WPPs). Two large WPPs in the Southern Sulawesi interconnected power system are Sidrap WPPs and Jeneponto WPPs. Both Sidrap WPP and Jeneponto WPP are the largest WPPs in Indonesia and they account for significant contribution for the Southern Sulawesi power generation mix. Considering the intermittency characteristics of WPPs and system’s failure probability, therefore it is essential to assess the system’s stability after their integration. This work evaluates the frequency stability of the Southern Sulawesi interconnected power system with the integration of both Sidrap WPPs and Jeneponto WPPs.
Utilization of fly ash waste power plant Bosowa energy Jeneponto South Sulawesi as concrete mixed material
Authors: Nurdin  , Zakir M , Demmallino E B
Published: May 2020

Flyash waste is a result of coal combustion which can pollute the environment. The research aims to determine (1) how the effect of the variation of the percentage of Flyash as a partial substitute for cement on the weight of the concrete load, (2) how the variation in the percentage of Flyash as a partial cement substitute for the compressive strength of concrete, and (3) how does curing variation effect (treatment) on the value of compressive strength of concrete with Flyash as a substitute for partial cement. The research was conducted in the Laboratory of Building Materials, Structures, and Construction, Faculty of Architectural Engineering, University of Hasanuddin, Gowa Regency, South Sulawesi Province. The method used in this study was an experiment by making concrete from Flyash class F waste from PT. Bosowa Energi Jeneponto Regency, South Sulawesi Province. Concrete samples were made in a total of 120 pieces for two types of curing, namely dry curing and water curing, four sample variations namely 0%, 30%, 50%, and 70% Flyash, weight testing and compressive strength of the samples carried out each of the three age of 3, 7, 14, 21 and 28 days respectively. The results showed that the average weight of the lowest concrete samples was in the variation of 30% Flyash for dry curing, which was 3.45 kg, and water curing was 3.61 kg, while the highest was in the 70% variation of Flyash for dry curing, which is 4.47 kg, and water curing is 4.61 kg. Based on variations of 0%, 30%, 50%, and 70% the compressive strength of concrete declined, namely 24.84 MPa, 22.16 MPa, 11.97 MPa, and 4.20 MPa, for dry curing, and 25.73 MPa, 22.93 MPa, 12.87 MPa, and 4.97 MPa for water curing. The effect of curing variations on the compressive strength of concrete is also increasing as the curing period increases, for dry curing 3, 7, 14, 21, and 28 days, respectively 12.73 MPa, 13.33 MPa, 13.63 MPa, 15,07 MPa, and 22.16 MPa, for water curing, respectively 13.50 MPa, 14.09 MPa, 14.56 MPa, 15.84 MPa, and 22, 93 MPa.
The utilizations of solid waste originating from super intensive shrimp farm as organic fertilizers for natural feed productions
Authors: Suwoyo H S , Tuwo A , Haryati  , Anshary H , Syah R
Published: May 2020

Productions and utilizations of organic fertilizers originating from solid waste of super intensive shrimp farms to reduce the amount of wastewater released to the surrounding areas and its environmental impacts, are recommended to support both aquaculture and agriculture industries. This study was aimed to evaluate growth of natural feed (plankton and lablab) fertilized by organic fertilizer originating from super intensive shrimp farm and other different fertilizers. Completely randomized design was applied in this study with four treatments and three replications. The following treatments were urea + SP-36 + organic fertilizers originating from super intensive shrimp farm + isolated shrimp ponds bacteria ISO (A), urea + SP-36 + commercial organic fertilizer (B), Urea + SP-36 + chicken manure fertilizer (C) and control, (urea + SP-36) (D). The dosages of fertilizers were: urea 200 kg/ha, SP-36 100 kg/ha, and organic fertilizers (solid waste originating from super intensive shrimp farm, commercial organic fertilizer and chicken manure fertilizer) 2000 kg/ha. The measured variables were species composition and abundance of phytoplankton, biomass of lablab, and water quality. The results of this study indicated that treatments A and B resulted high in number of plankton genera, which was 19 genera, whereas treatments C and D only 10 genera. The highest mean abundance of plankter was found in Treatment A, which was 14,571 ind/L, followed by Treatment B, 9,489 ind/L; Treatment C was 8,717 ind/L and the lowest was found in Treatment D 5,066 ind/L. The dominant phytoplankton observed in this study was Oscillatoria sp. whereas the most observed zooplankton was Branchionus sp. The mean biomass of lablab produced from solid waste originating from super intensive shrimp farm was 4.35 g/100 cm2 which was not significantly different (p>0.05) from Treatments B and C, but significantly different (p<0,05) from the control. The water quality variables measured during this study was within the acceptable values for natural feed productions.
Potential of biogas production as renewable energy in smallholder dairy farming in Enrekang District, South Sulawesi
Authors: S Aisyah R , Salman D , Siregar A R , Baba S
Published: May 2020

The dairy cow in Enrekang Regency not only produces the main product of fresh milk that is processed into “Dangke” (typical food of Enrekang Regency), but it is also able to produce by-products in the form of alternative energy. The purpose of this study is to analyze the potential of renewable energy by utilizing biogas on people’s dairy farms. The study was conducted in Cendana Subdistrict, Enrekang Regency in May 2018 to Juni 2019. Data were collected using observation, interviews, and documentation with dairy farmers using a purposive sampling method and analyzed using quantitative descriptive. The results show that the potential for feces production over the past five years from 570 dairy cows can produce 11.402 kg/day. Thus, the biogas produced is 456 m3/day, considering that one cow can produce biogas of 2 m3/day and 1 m3 of biogas can be used equivalent to 0,62 liters of kerosene and 0,46 liters of LPG gas. Besides, the potential of biogas energy can meet the cooking needs of one family (4-5 people) for 190 hours or 8 days, considering that the energy contained in one m3 of biogas is 2,000-4,000 Kcal or equivalent to 3 hours. Biogas technology has provided many benefits including improving the health of breeders’ families, used to process cow’s milk into dangke and saving LPG gas expenditure expenses so as to be able to provide additional income for farmers, even though the value generated is not large enough, but the reduction in costs is enough to reduce the cost burden household issued every month.
Description of correlation between quantitative and qualitative assays on candlenut DNA
Authors: Gusmiaty  , Nurhafidah  , Larekeng S.H.
Published: May 2020

DNA isolation is a crucial step in the molecular analysis, which influences the quantity and quality of the DNA. The objective of this study was to determine the correlation between DNA quantitative and qualitative assays on Candlenut (Aleurites moluccana) DNAs. This study was carried out in February up to April 2019. The research procedures consisted of sample collection, DNA isolation using CTAB method and Qiagen DNeasy Plant Mini Kit (QDPMK kit protocol), DNA quantitative assay using Qubit 3.0 fluorometer, and DNA qualitative assay using horizontal electrophoresis. No positive correlation was detected between DNA quantitative and DNAqualitative assays. The quantitative assay observed that the isolated DNA using QDPMK yielded more DNAs than CTAB (<0.2 ng/µl). Meanwhile, DNA qualitative assay reported QDPMK had better DNA quality than CTAB
Climate forecasting uses backpropagation algorithm artificial neural network model for agricultural planning in Gowa regency
Authors: Lestari A A , Munir A
Published: May 2020

Climate is defined as the average size and variability of the relevant quantities of certain variables over a period of time with a period of time from monthly to annual or millions of years. This study aims to develop climate prediction models that are used for planning agricultural cultivation activities. The method used in predicting climate is Backpropagation Artificial Neural Network technique based on rainfall data in 1975-2018 in Pallangga sub-district, 1992-2018 in Bontomarannu sub-district and 1997-2018 in Bontonompo sub-district. The results showed that the climate classification according to Oldeman in Bontomarannu sub-district was in the B3 climate type suitable for planting rice crops twice and crops once a year while Pallangga sub-districts and Bontonompo sub-districts were in C3 climate type suitable for planting one-time rice crops and crops twice in one year.
Application of SWOT-AHP in analyzing external and internal environment of youth empowerments
Authors: Syamsuddin A P , Ridwan  , Supratman
Published: May 2020

The low quality of youth resources, the lack of optimal coordination between youth organizations and youth empowerment in Soppeng District so that researchers are interested in conducting more in-depth studies. This study aims to analyze strengths, weaknesses, opportunities, and threats in the implementation of youth empowerment programs and formulate strategies for implementing the Soppeng District Youth and Sports Service Youth Empowerment Program. This study uses the SWOT-AHP method with the descriptive translation then tabulated so as to give birth to a choice of strategies that are a priority or more important. The results of the study found that the strength (S), weakness (W), opportunity (O) and threat (T) groups in the four groups were higher (S) with a value of 0.4958 compared to weaknesses, opportunities, and threats, for threats with the lowest value is 0.0719. The global priority of 16 statements from each strength (S), weakness (W), opportunity (O) and threat (T), the highest value is a 0.5300 statement of weakness (W1) while the lowest value is a threat (T4) 0.0609. The priority groups that are the focus of strengthening the Soppeng District Dispora include the highest value of the SWOT group (Strengths, Weaknesses, Opportunities, and Threats) while the factors that have the highest common values are (Weakness, Opportunity, Threat and Strength). The implementation of the youth empowerment strategy program in Soppeng Regency run by the Dispora is inseparable from the influences of various aspects, both from strength and weakness (internal) and Opportunities and Threats (external). But the choice of the right strategy for Dispora or things that need to be strengthened from the four strategies ST1, ST2, ST3 and ST4, namely ST1 (SO). Awaken young people about the importance of empowerment can be carried out through seminars and provide training on the importance of empowerment, but the youth as objects and subjects must be aware of themselves that the future will be a legacy for them as a youth, especially youth in Soppeng Regency.
The effect of traffic volume on noise of housing and shopping area of Manggala District
Authors: Kamal N M , Jinca Y , Wunas S
Published: May 2020

Pollution includes environmental problems that threaten major cities in Indonesia, especially those originating from motor vehicle emissions and the effect of noise on health. This study aims to determine how the impact of traffic volume with noise by looking at the functional aspects of buildings along the road. This study measured the noise and data collection of traffic volume on the Main street in the neighbourhood between the sub-districts of Manggala, Makassar. Data collection comes from primary data, namely, data from research results and secondary data, library search. The results of the data collection were obtained, namely the volume of vehicles higher on Friday, namely on the road of DR J Leimena, which is 531 units of vehicles, the lowest in the Bukit Baruga housing estate. The more vehicles, the higher the noise level. The results of noise measurements at the research location indicate that in the Bukit Baruga residential area the maximum range is 53 dB, on the LAN 63 dB and the road Dr. J. Leimena - Jalan Antang Raya is around 65 dB, referring to KEP.48/MENLH/11/1996, November 25, 1996. The results of the communication disruption questionnaire are quite disturbing to the community. This study concludes that the noise level prediction model is directly proportional to the volume of traffic and is influenced by factors of road conditions (flat and elevation) and the distance from occupancy to the road.
Estimating the catchable size of orange-spotted grouper (Epinephelus coioides) in Kwandang Bay, Gorontalo Utara District, Indonesia
Authors: Achmad D S , Sudirman  , Jompa J , Nurdin M S
Published: May 2020

The orange-spotted grouper (Epinephelus coioides) is a valuable food fish. To support the sustainable management of orange-spotted grouper fisheries, it is important to determine the optimum catchable size. The purpose of this study was to determine an optimal catchable size for the orange-spotted grouper stock in Kwandang Bay, North Gorontalo District, Indonesia. The Catchable size was determined based on the size at first sexual maturity, fecundity, and reproductive potential. The study was conducted from December 2016 to November 2017. The size at first sexual maturity was estimated based on the examination of gonads from 141 specimens, while fecundity was estimated based on a sample of 40 female fish with ripe gonads. The mean total length (TL) at first maturity was 40 cm. Fecundity ranged from 30,526 - 1,395,846 eggs with a mean of 687,025 eggs. The reproductive potential was highest in the size range of 55-64 cm TL. The recommended size for orange-spotted grouper is above 64 cm, to enable females to attain their maximum level of egg production before capture and thus contribute to maintaining the stock.
The influence of POGIL learning model by mind mapping and summary assignment of salt hydrolysis outcomes
Authors: Sumanik N B , Nurvitasari E , Maarebia R Z , Pasaribu Y P , Buyang Y , Rettob A L , Genisa J
Published: May 2020

Salt hydrolysis is a difficult subject matter for some students, due to the characteristic aspects of chemical concepts and aspects of the learning model. Overcoming the difficulties of these students, one of them uses POGIL (Process Oriented Guided Inquiry Learning) learning. The POGIL learning model does not direct students in documenting material, so it is accompanied by mind mapping and summary. The purpose of this study was to determine the differences of students’ cognitive learning outcomes in the POGIL learning model by mind-mapping assignment between the students taught using the POGIL learning model with a summary assignment on salt hydrolysis material. This study used a quasi-experimental model with posttest only control group design. The results of this study showed that there were differences in cognitive learning outcomes which shown on the average value of students taught with POGIL learning models accompanied by assignments mind mapping higher compared to students who were taught with the POGIL learning model along with summary assignments.
Development of practical tools faraday effects on magnetic materials
Authors: Henukh A , Utomo M E , Nikat R F , Reski A , Simbolon M , Asmal S
Published: May 2020

This research aims to develop practical tools faraday effects that can be used as a medium for learning physics subjects in magnetic materials. The development method used is the Research and Development (R&D) method with the ADDIE model approach. The stages of this research are to Analyze, Design, Development, Implementation, and Evaluation. The tools and materials used are magnetic field sensors, 400 winding solenoids as induction sensors for test materials, Power Supply, 500x magnification USB microscope, CSV as data storage from sensors, Delphi 2007 as a hysteresis curve viewer. Product evaluation in the form of validation was carried out using an instrument in the form of a questionnaire filled by media experts with an average score of 93.94% so that it was in the excellent category and material experts with an average score of 86.05% so that it was in the very good category. The expected results of this study are. The results of the assessment of the effectiveness of the Faraday effect practicum tool, an N-gain of 0.67 was obtained that the average pretest was 48.0 and posttest 83.0. Based on the data above, this research shows that the development of the Faraday effect practicum tool is suitable for use as a learning medium.
Effectiveness testing of attitude (Enhalus acoroides) on lead (Pb) and copper (Cu) metals
Authors: Sardi  , Nafi N L , Ambo Rappe R
Published: May 2020

Increased human activity in all sectors due to rapid development, often resulting in pollutants such as heavy metals that have an impact on the environment and one alternative is phytotechnology. This study aims to (1) Determine the seagrass’s capacity to absorb lead (Pb) and copper (Cu), (2) Determine the optimization of seagrass, sediment, and seawater in absorbing Pb and Cu. This study was an experimental study carried out at the Hasanuddin University hatchery unit, Barrang Lompo Island, then analysis of Pb and Cu metal content in the Analytical Chemistry Laboratory of the Department of Chemistry, Faculty of Mathematics and Natural Sciences, Hasanuddin University using the Atomic Absorption Spectrophotometer (AAS). The results showed that Enhalus acoroides seagrass had capacity dal am absorbed Pb of 0.08 mg/kg at a concentration of 120 ppm, while dal am absorbed Cu of 0.65 mg/kg at a concentration of 2 ppm, so that this seagrass is more effective at absorbing Cu than Pb, the Pb optimum results in seawater at a concentration of 120 ppm at 3.04 mg / L and sediment at an concentration of 80 ppm at 29.30 mg/kg, while the optimum yield of Cu content in seawater and sediments, obtained at concentrations of 1 ppm and 2 ppm, namely 0.56 mg/L in seawater and at a concentration of 4 ppm is 29, 67 mg / kg in sediment. While the optimal absorption of Pb by seagrass occurs at low concentrations of 40 ppm and 80 ppm of 0.07 mg/kg. The same result was obtained in sediments, 29.22 mg/kg at a concentration of 40 ppm. While the optimum Pb content in seawater is at a concentration of 40 ppm of 1.26 mg / L.
Livestock business development of border areas in North Sulawesi Province
Authors: Santa N M , Sompie F N , Waworundeng W
Published: May 2020

This study aims to analyze the development of livestock farming in North Sulawesi Province, especially the border areas. This research was conducted using a survey method in the border areas in North Sulawesi Province, namely the Sangihe Islands, Talaud, Siau Tagulandang and Biaro. The data are then analyzed descriptively about the number and types of livestock farms managed by the community, and market opportunities for livestock products. The results showed that livestock farming is very likely to be developed in the border area. All traditional markets in the area sell animal husbandry products in the form of meat and eggs from the city of Manado. The existence of livestock farming is still lacking, so the Regional Government needs to program animal husbandry development through development policies in the area.
The Effect of the door opening on various channel type of flow velocity (Case Study: secondary channel of the Saddang Irrigation Area, Pinrang Regency)
Authors: Syamsuddin G H , Maricar F , Lopa R T
Published: May 2020

Water that flows in channels in free conditions is water that flows in open channels and comes into contact with free air. All flows that enter the open channel system are designed to flow by gravity. The Open channels can be divided into two types, namely artificial and natural channels. Open channels encountered in technical, semi-technical, and non-prismatic irrigation. Research is carried out in line Secondary Regional Irrigation Alitta village Bentenge Subdistrict Paleteang district Pinrang the channel reviewed is a secondary channel which has a different type of channel, namely pair stone channel, concrete lining channel, precast concrete channel, and soil channel which is influenced by 3 door openings, namely 20 cm opening, 30 cm opening and 40 cm opening.
Components of steel slag in acid-contaminated porous concrete
Authors: Tonapa S R , Febriani L , Sandy D
Published: May 2020

The presence of slag as a result of waste from steel production annually increases. Researchers and environmentalists are very concerned to overcome this problem. Currently steel slag has been studied as a substitute for concrete compilers. The focus of this research is to utilize steel slag as a constituent of porous concrete in direct contact with acidic regions, in this case sulfuric acid and chloride. This test was carried out using 243 samples in testing the compressive strength, tensile strength and pore volume of concrete. Content of steel slag used is 0%, 50% and 80%. In the compressive strength test results for normal curing, sulfate curing and chloride curing showed an increase of 6.49%, 5.71%, 8.28% in the 50% slag content and 10.81%, 10.29%, 17.20% in the 80% slag content. Then in the tensile strength test showed an increase of 7% to 11% in the 50% slag content and 16% to 17% in the 80% slag content. As for the pore volume, the value is in range from 17% to 19%. These results indicate that slag can be used as a substitute for aggregate on porous concrete with compressive strength ranging from 10 MPa to 19 MPa.
Comparison of copper adsorption effectivity in acid mine drainage using natural zeolite and synthesized zeolite
Authors: Wulandari E , Hidayat A E , Moersidik S S
Published: May 2020

Acid mine drainage (AMD) contains a high concentration of various heavy metals and have low pH levels. In this study, the comparison between the use of natural zeolite and synthesized zeolite for Cu2+ removal in AMD was conducted. The adsorbent of natural zeolite was prepared through a chemical activating method by adding NaOH. While, synthesized zeolite was made from coal fly ash using a two-step method, fusion, and hydrothermal process. The AMD used in this study was artificially designed with the concentration of Cu2+ 100 ppm and pH ± 3. The adsorption experiment was carried out using a batch method to observe the influential parameters such as adsorbent dosage, contact time, adsorbent isotherms, and kinetics. The result show that the removal efficiency of Cu2+ for natural zeolite and synthesized zeolite was 98,16% and 93,98 % with optimum adsorbent dose 1,5 g/l and 21 g/l, respectively. The optimum contact time for both adsorbents was 120 minutes. The Langmuir isotherm model fitted the adsorption for synthesized zeolite and natural zeolite, with the maximum sorption capacity of 23,8 mg/g and 30,03 mg/g, and the kinetics model of pseudo-second-order and pseudo-first-order. The result of this study that the good adsorption effectivity synthesized zeolite. Furthermore, both natural zeolite and synthesized zeolite have great potential as a sustainable and economical material for heavy metal removal ion Cu2+ in wastewater.
Flexural behavior of double straight notch joint beam column exterior due to lateral cyclic load
Authors: Palembangan M T , Parung H , Amiruddin A. A. , Simbolon R
Published: May 2020

This study aims to determine and analyze the flexural behavior of the double straight notch joint beam column exterior due to lateral cyclic load. There are 3 (three) scale test specimens, BK monolith, SBK type 1 and SBK type 2. The joint model on the beam is a double straight notch and uses the method of mechanical connection and grouting. Loading with alternating lateral loads assumed as cyclic loads. Testing and analysis using the Displacement Control Method with the standards of the European Convention for Constructional Steelwork (ECCS) 1986. The results showed that the stability of SBK type 1 and type 2 specimens in terms of the characteristics of the hysteresis loop curve had a curve similar to BK monolith. The greatest displacement in compressive conditions occurs in SBK type 2 while drag conditions occur on monolithic BK. From the results of the study, it is also known that lateral loads are directly proportional to displacement, where the higher the lateral load is borne the greater the displacement experienced and vice versa. The displacement ductility that occurs is the partial ductility in type 1 SBK = 0.971 monolithic BK while SBK type 2 = 1.047 monolithic BK. Based on the results of studies of some of these behaviors, type 2 SBK has more advantages than type 1 SBK so that the results of SBK type 2 analysis can then be used as validation of monolithic BK.
Elasticity modulus concrete of abaca fiber
Authors: Tampi R , Parung H , Djamaluddin R , Amiruddin A
Published: May 2020

This research study discusses the modulus of elasticity of concrete using abaca fibers. The addition of abaca fiber to concrete mix is done with the composition of abaca fiber 0% (normal concrete), 0.15%, 0.20%, 0.25% with a fiber length of 50 mm. Concrete cylindrical specimens (100 mm x 200 mm) with each variation of 3 cylinders with a total of 12 specimens tested after the specimens reached 28 days in a Universal Testing Machine (UTM) and evaluated through the ASTM standard in testing concrete compressive strength. Concrete compressive strength test results with variations in length of 50 mm with a fiber volume of 0.15% produces an elastic modulus of 23057.14 MPa. For a volume of 0.20% the modulus of elasticity is 19575.44 MPa. Then for the fiber volume of 0.25% the modulus of elasticity is 17104.90. Normal concrete modulus value 20058 Mpa. From these results it can be concluded that the more fiber volume, the smaller the modulus of elasticity. The modulus of elasticity of abaca fiber concrete with a fiber length of 50 mm and a fiber volume of 0.15% is the best and gives an increase of 14.96% to normal concrete.
Shear strength of annealed wire fiber reinforced concrete coupling beam under cyclic loads
Authors: Kandou C , Parung H , Djamaluddin R , Amiruddin A
Published: May 2020

The design and construction of the coupling beams remain challenging due to the presence of large reversed-cyclic nonlinear rotation demands combined with large shear forces. One way to increase the shear strength of a coupling beam is to use fiber. The purpose of this research is to determine the shear strength for coupling beam using annealed wire fiber. Two coupling beam test specimens measuring 20 cm x 40 cm with a length of 115 cm with a ratio of Ln / h is 2.875 with the details of 1 coupling beam without fiber (CB-1) and 1 coupling beam with fiber (CBF-1). Annealed wire fiber used in research with diameter (D) 0.8 mm with fiber length (L) 48 mm (L / D ratio is 60) with fiber composition 0.75% of volume. The results show the Shear strength of coupling beam using fiber increases by 58% from normal concrete shear strength. Also, the shear strength of the coupling beam in SNI 2847:2013 is 0.67 and 0.42 of the experimental shear strength of normal CB and annealed wire fiber CB so that the design of the coupling beam based on SNI 2847:2013 can be used as a reference in planning earthquake resistant building structures.
Synthesis and characterization of stigmasterol imprinted polymers with precipitation polymerization method
Authors: Fauziah S , Sialla F S , Soekamto N H , Budi P , Taba P
Published: May 2020

Molecularly imprinted polymers (MIP) are porous materials that have an active binding site and can recognize specific target molecules. MIP synthesis was carried out by precipitation polymerization method using toluene as a porogen solvent and stigmasterol molecule as a template molecule. The synthesized NIP and MIP were characterized using FTIR and SEM-EDS. The ability of MIP adsorption on Stigmasterol was determined by concentration measurements using UV-Vis. The results of the characterization using FTIR showed that the functional groups that influence the formation of NIP and MIP are -OH, -CH, C=C, and -C=O. Characterization using SEM shows that the surface morphology of MIP is rougher than NIP. Characterization using EDS showed that there was a decrease in mass% by 2.54% and C% atom by 2.08% in MIP after extracting the Stigmasterol molecule. The ability of MIP adsorption on stigmasterol was 0.204 mg/g, while the ability of NIP adsorption on stigmasterol was 0.040 mg / g. The ability of MIP adsorption to stigmasterol molecules is better than NIP. Therefore, MIP can be used as an adsorbent to adsorb stigmasterol in sample extracts.
The digital media literacy level of the youth in Majene regency and its relationship with the hierarchy of regional development
Authors: Bakri R F , Mursalim  , Budimawan
Published: May 2020

Residents of Majene Regency especially young people today like to access information sites on the internet so digital media literacy skills were needed among young people. The research aims (1) to review and describe the digital media literacy level in the Majene Regency and (2) to review and describe the relationship of digital media literacy level and regional hierarchy development of Majene Regency. The research was classified as explanatory research with a quantitative approach. Determination of samples by probability sampling. Data were collected with a questionnaire and document study method. The data were then analyzed using the scoring method with Likert’s scale and scalogram analysis with Gutmann’s scale. The research results indicated that in general digital media literacy’s young level in the Majene Regency was classified as moderate, the capacity of their technical skills was categorized as high, their critical understanding capacity, as well as their communicative abilities, were categorized as moderate. The correlation between the development of the Majene Regency area the literacy level of the youth has a significant correlation. The regions which have a higher hierarchy in digital media literacy of the youth would be categorized as high, while the regions which had a lower hierarchy in digital media literacy would be categorized as low.
Extraction of Methylene Blue from Aqueous Solutions by Waste Cooking Oil and its Back-Extraction
Authors: Sipi A K M , Chang S H
Published: May 2020

This work aimed to use waste cooking oil as a greener replacement for the petroleum-based solvents in removing methylene blue (MB) from aqueous solutions by solvent extraction. The effects of different extraction parameters such as equilibrium pH, aqueous to organic phase ratio, and initial MB concentration on the extraction of MB from aqueous solutions by waste cooking oil were investigated. The back-extraction of MB from MB-loaded waste cooking oil was also explored. The maximum extraction (∼90%) and back-extraction (>90%) of MB were attained at equilibrium pH of 8, aqueous to organic phase ratio of 1:1, initial MB concentration of 20 mg/L, and with 1 M of sodium bicarbonate as the back-extraction agent.
Eulerian-Eulerian Approach to CFD Simulation of Two-Phase Bubble Column
Authors: Halim Nur Khairunnisa Abd , Hussain Siti Aslina , Razak Mus’ab Abd. , Mohd Yunos Mohd Amirul Syafiq
Published: May 2020

Calculation work is carried out in the present project to study the effect of different parameters on hydrodynamics of gas-liquid flow by using CFD. The steady state and transient, three dimensional simulations are performed of the whole bubble column for various inlet gas and sparger designs. A standard k-ε is used to describe turbulence occurring in the continuous fluid. Results show he asymmetric recirculation stronger with an increase in the number of holes giving better mixing. The gas hold-up increased with superficial gas velocity but independent of the sparger design at high velocity. Comparison of simulation results with the previous experimental work data has provided a successful validation of the model.
Research on Modular Coordination of Indemnificatory Finished Product Housing in Severe Cold Region of China ——A Case Study of an Experimental Residential Project in Harbin
Authors: Shao Yu , Mo Yizhou
Published: May 2020

This paper study the case of an experimental house built in Harbin and analyses the modular coordination of indemnificatory housing in severe cold area. Using case analysis and literature research methods, the modular coordination system of the experimental house is analysed, and this conclusion is elaborated from three aspects: component position, space optimization size and modular grid. The research shows three key problems in modular coordination of indemnificatory finished product housing in severe cold region: how to select the positioning mode of building components; how to select the optimal size according to the infill parts; and how to establish modular grid according to the spatial organization.
The Potential Use of Waste Cement as a Filler in Polymer Composites
Authors: Rattanapan A , Sritapunya T , Tuampoemsab S , Sapsrithong P
Published: May 2020

This study explores the potential to use waste cement particles from ready-mixed concrete industry as a low cost filler in polypropylene. Its effects on mechanical and morphological properties were investigated in comparison with commercial cement and calcium carbonate. Mixing and shaping procedures of the polymer composites specimen were conducted by two-roll mill and injection molding, respectively. Next, the effect of filler loading (0, 10, 20, 30, 40, and 50 phr) and filler type on the mechanical and morphological properties of the polymer composites were studied. The results show that when filler loadings increased, the young’s modulus, flexural modulus, impact strength, and hardness of the polymer composites also increased accordingly, while the tensile strength and flexural strength decreased. Moreover, the results show that the waste cement had a greater effect on the enhanced mechanical properties compared to commercial cement and calcium carbonate. Furthermore, the polymer composites’ morphology was studied using scanning electron microscopy. A microstructure analysis was performed to verify and provide a better assessment of the performance properties of the polymer composites.
Evaluation of Repair Quality for Concrete Structure by Non-Destructive Technique
Authors: Lin Yung-Chiang , Hsu Keng-Tsang , Cheng Chia-Chi , Lin Yi-ching
Published: May 2020

The objective of the proposed research project is to develop a non-destructive test technique based on stress wave for quantitative evaluation of the repairing status of concrete. Concrete structures frequently exist various types of cracks due to an inferior environment and excessive loading. There are several crack repairing techniques used in concrete construction. Epoxy-injection is popular maintenance method in crack repairing of the damaged concrete structure. In this paper, a technique based on the stress wave was used to evaluate the repair quality of concrete crack. Numerical simulation is also under research and results show that the stress wave propagation is capable of identifying the infill of epoxy-injection in the crack of repaired structures. The new technique under development has a high potential for evaluation of the quality of the repaired cracks.
Amino-Acid-Salt-based Carbon Dioxide Capture: Precipitation Behavior of Potassium Sarcosine Solution
Authors: Ma’mun S
Published: May 2020

This work studied the precipitation behavior of solids in the aqueous solution of potassium sarcosine (KSar) during the CO2 capture process with the concentration of 5m’ (mol/kg solution). The effect of precipitation on the CO2 capture capabilities was also studied. The results showed that 5m’ KSar gives a comparable result to MEA. The relatively high initial CO2 absorption efficiency combined with the positive effect of precipitation on CO2 absorption rate and CO2 capacity have made the 5m’ KSar be a promising solvent for the CO2 capturing process with precipitation.
Contribution of Nano Crumb Rubber on Recycled Asphalt Concrete As Pedestrian Paving Block
Authors: Annisa S L , Hadiwardoyo S P , Sumabrata R J , Iskandar D
Published: May 2020

Stripping the road surface layers of asphalt concrete caused by various considerations that have been damaged by the aging process of asphalt. This stripping material will continue to grow in sufficient quantities if the recycling process is not utilized. The recycling process can be done by restoring the performance of asphalt or aggregate and can even occur both to meet the specifications required originally. In this research, asphalt concrete mixture has been used where the asphalt element has undergone an aging process so that it needs to be rejuvenated or softened. The addition of used oil has been used in the process of softening the hot Asphalt Concrete Wearing Course (ACWC) type. The process of increasing the performance of recycled blends has used Nano Crumb Rubber (NCR) material. The test results show that the ratio of the old asphalt content and used oil as a softener is obtained with a ratio of 11: 4 to obtain the required level of softening. This composition has produced a bitumen penetration value of 60, and the addition of NCR 2.5% and 5% to the asphalt content. Testing for recycled asphalt mixes is carried out with Marshall Test, Indirect Tensile Strength (ITS), and water absorption testing for recycled mixtures for paving blocks. The test results show the addition of NCR by the dry method has increased the strength of the mixture at both ambient and higher temperatures of 35 °C and 45 °C.
A Study of Inspection for Electrical Safety Systems Case Study Four Locations in Thailand
Authors: Charoenchit S , Thongchaisuratkrul C
Published: May 2020

This research presents study of inspection for electrical safety in electrical system. The four locations are observed. The objective of this research are to study the problems which may be occurred in electrical system and introduce the prevent ways. The four locations consist of 2 factories of paper and 2 animal food factories. For factory of paper, the total electrical load is 18,450 kVA which consists of 10 transformers and another 13,450 kVA which consists of 10 transformers. For the animal food 800 kVA, another is 1000 kVA which each location is a transformer. The inspected systems include transformer, main distribution board, ground and electrical wire systems. The check instruments are test oil maker, thermo scan, earth clamp tester, earth ground tester, infrared tester and outlet tester. The all data from test is analysed to compare among of four locations. For experimental results, it is of found that for transformer, the oil insulation transformer is lower than standard and silica gel is deteriorated and broken box, rubber shield and rubber gasket is broken and damage. For main distribution board, the ground value is lower than standard and the temperature of junction for breaker is high and more dust. For ground system, the ground value is lower than standard and broken. For wire system, the electrical is damaged because of heat and animal.
Analysis of Characteristics and Research on Processing Method of the High Viscosity DW-1 Colloid
Authors: Liu Xuyang , Xu Haibo , Wang Li , Xue Haiyang
Published: May 2020

All the variation of the viscosity characteristics of the high-viscosity DW-1 colloid at different temperatures are mainly analysed in the paper. Based on the experimental data, it concludes that the heat treatment method at 45-65°C can keep the colloid with good fluidity within 15 minutes. The inhibitory effect of organic solvents on solid particles in colloids is also studied. By adding an appropriate proportion of Butanone to the DW-1 colloid, a better colloid particle treatment effect is obtained and the colloid curing speed is increased by about 2 times within 24 hours. Finally, the treatment methods and effects of colloids before spraying are summarized.
Thermal Analysis of the Urban Canyon Based on the Variables: Orientation, Wind and Vehicular Anthropogenic Heat
Authors: Rosado Ruth María Grajeda , Guzmán Elia Mercedes Alonso , Molina Wilfrido Martínez , Arroyo Juan Alberto Bedolla , López Carlos Javier Esparza , García Hugo Luis Chávez
Published: May 2020

The city and its behavior in the transfer of heat, generates lines of research that study phenomena such as the Island of Urban Heat (ICU); Within its formation factors, the heat expelled by the vehicle is the least analyzed in the literature. Thanks to the Computational Fluid Dynamics (CFD) software and its validation with measurements in the field, data is acquired to examine the thermal behavior in an urban canyon based on the number of cars passing through it and the heat expelled by its engines, the speed of the wind and orientation. The results show that the temperature increases between 26% to 10% more, and the highest values are in the simulated cases with a north-south orientation, affecting the passer-by as to the energy efficiency of the buildings.
Mapping the LST (Land Surface Temperature) with Satellite Information and Software ArcGis
Authors: Rosado Ruth Maria Grajeda , Guzmán Elia Mercedes Alonso , Lopez Carlos Javier Esparza , Molina Wilfrido Martínez , García Hugo Luis Chávez , Yedra Eduardo Limón
Published: May 2020

This document describes the procedure to calculate the LST (Land Surface Temperature). The series of steps and equations is described using the thermal bands offered by the LandSat 8 satellite and the ArcGIS program tools. Although there are other methods and tools this procedure explicitly breaks down the use of information.
Prediction of the Fatigue Life of the AISI 1513 Carbon Steel Lower Arm Based on Strain-Life Approach
Authors: Husaini  , Putra Teuku Edisah , Rizky Muhammad Reza
Published: May 2020

The purpose of this study is to predict the fatigue life of a lower arm as a vehicle is driven on a straight and turn roads. The measurement of strain signals was carried out by attaching a strain gauge to the left lower arm and driving it with an acceleration of 30 km/h. According to the results, the lowest fatigue life was obtained just as the vehicle turned clockwise, which was 2.6E+6 cycles to failure. This value was lower by 123% and 1,862% than it was driven straight and counter-clockwise. Similarity, when the vehicle turned to the right, the lower arm on the left side received a higher strain, contributing to a shorter fatigue life.
A traction controller of a two-wheel mobile robot with feedforward compensator
Authors: Dahlan M , Sutapun A , Sangveraphunsiri V
Published: May 2020

A simple traction controller was derived from a model following control (MFC) using bilinear transformation. The controller was simplified by adjusting some dynamic parameters. The experiments were conducted to evaluate the validity of the controller by comparing with the classical PD controller. In the experiments, while the traction controller can prevent slippage, tracking control performance needed to be improved. The feedforward compensation was added to reduce the traction error. The experimentation using the simple controller with feedforward shows that the position error has been reduced while maintaining the traction force between floor and wheels.
Experimental Studies of the Corrosion Resistance for Q235 and Q235NHin the Outdoor High-voltage Disconnector
Authors: Zhou Z Q , Zhou Y T , Jhe J , Lu Y , Sun Q F , Mao H Y
Published: May 2020

Aiming at the corrosion failure question of the outdoor high-voltage isolation switch, accelerated corrosion testsusing 5% (mass fraction) NaCl salt spray for materials of Q235 and Q235NH were carried out. By means of the controlled trials method, samples were divided into two groups, and each group contains four specimens. After that, neutral-salt-spray corrosion tests with 60h, 100h, 130h, and 160h were conducted. Finally, the rust layer was observed by a microscope, and the corrosion rate was calculated according to the weight loss method. Experimental results indicated that the rust layer in Q235NH was more compact after being corroded. As a result, it provide more protection for the substrate.