bluuebunny/crossref_metadata_2025_split huggingface dataset:
Isolation and Characterization of Amylase-Producing Amylolytic Bacteria from Rice Soil Samples
Authors: Silaban Saronom , Marika Dona Best , Simorangkir Murniaty 
Published: May 2020

Abstract
Amylase is an enzyme that plays a role in hydrolyzing starch to simple sugars. This protein is very important for various industrial processes. Microorganisms are considered as the best source of amylase production. This study was aimed at isolating and dentifying amylolytic bacteria from rice soil samples that have the potential to produce amylase enzymes. Rice soil samples were collected from two locations, namely the Percut Sei Tuan area and Labu Beach. Samples was isolated, then macroscopically identified with microscopy, and microscopically characterized with catalase test, endospore staining and gram staining. The identification results showed that 14 bacterial isolates from the two samples potential to produce amylase enzymes. The isolates which were characterized with catalase test showed positive results for all isolates. The characterization results with endospora staining showed 7 positive isolates and 7 negative isolates. Likewise with the results of gram staining characterization. Thus, from the two sample locations obtained amylolytic bacteria that potentially produce amylase enzymes.
Analysis of Safety Reactivity Factor on RSG-GAS Core using New Fuel
Authors: Surbakti T , Surian P , Farisy Y , Imron M 
Published: May 2020

Abstract
The RSG-GAS is using U3Si2-Al dispersion fuels with a uranium density of 2.96 gU/cc. The silicide uranium fuels are not used anymore for the future. To anticipate the usage of other fuels in the RSG-GAS core, UMo-Al fuels were chosen. The UMo-Al fuel has many advantages some of them, it can be used at a higher density in the reactor core. There are high uranium densities in UMo-Al dispersion fuels up to 16 gU/cm3 with numerous contents of Mo. In this analysis, the RSG-GAS core is used with a high density of UMo-Al fuel. The neutronic parameter is such as reactivity balances, keff, and power peaking factor and safety reactivity factor of UMo-Al fuel with higher density. The UMo-Al core criticality data are achieved by calculation using the Batan-FUEL code. The UMo-Al fuel macroscopic cross-section data as the output of cell calculation WIMSD-B5 (ENDFVII.0) were used for the calculation. The core calculations were performed using a 2 and 3 dimension diffusion code. The calculation results show that the good fuel for RSG-GAS is U7Mo-Al with maximum radial and axial power peaking factor of U7Mo-Al with high density at 20 cm control rod depth is 1.32 and 1.73 respectively and safety reactivity factor more than 1.5. The results show that all neutronic parameters are met the safety criteria. Hence U7Mo with higher density could be applied for RSG-GAS core and operated for 1500 MWD cycle length
Retrieving Surface Soil Moisture from Optical Satellite Imagery over Medan and Surrounding
Authors: Tampubolon Togi , Juliani Rita , Hutahean Juniar , Yanti Jeddah 
Published: May 2020

Abstract
The Earth’s environmental surface have change in local, regional and also global scale in any environmental parameter. Medan, one of big city or region in Indonesia, has fluctuated tropical climate in hydrological cycle. Soil moisture is a key variable in the hydrologic processes that play an important role in determining the availability of water as a fundamental element in human life. Soil moisture is an important parameter for many processes’ hydrology, biology and biogeochemistry. The aim of this study to integrated soil moisture over land area in Medan and surrounding. One of the existing methods to obtain information about soil moisture is Temperature-dryness Vegetation Index (TVDI). TVDI a drought index that is determined based on the empirical parameters of the relationship between surface temperature (TS) and vegetation index (NDVI). The index is associated with soil moisture and obtained only by the input of satellite remote sensing information. Dataset use Landsat 5 TM during 2005 to 1989, Landsat 7 ETM image for 2011, and Landsat 8 OLI for 2014 - 2016. Vegetation index value calculation using InfraRed band (4 to Landsat 5 TM and Landsat 7 ETM or 5 for Landsat 8 OLI) and Band Shortwave InfraRed (5 for Landsat 5 TM and Landsat 7 ETM or 6 for Landsat 8 OLI). The result will be classified from low to high value TVDI. TVDI maximum value each period of the years showed value above > 0.5 that means from moderate to high moisture. From the linear function of TVDI shows the decreasing soil moistures during those time period that assumes assumed the source of soil moisture decreasing conditions due to the surface runoff that resulting in a change in vegetation area and surface temperatures. Reduction of a soil’s capacity to accept, retain, release and transmit water reduces biomass productivity, whether of crops, pasture species, shrubs or trees.
Semiparametric Bootstrapping Forestimating Parameters in Krigingmodel for Deterministic Simulations
Authors: Simamora Elmanani , Susiana  , Widyastuti Eri 
Published: May 2020

Abstract
In practice, the parameters in the Kriging model are unknown, but they can be estimated based on the behaviour of the observed data. Parameters in the Kriging model can be estimated based on the consideration of Regression-Kriging models. Regression-Kriging models are Universal Kriging models with polynomials of degree zero (Ordinary Kriging), one (Universal Kriging with degree one), or two (Universal Kriging with degree two). A new method for estimating the parameters in the Kriging model with semiparametric bootstrapping is proposed in this paper. The semiparametric bootstrapping procedure works by combining the bootstrap method and Kriging.
Estrogen Receptor Alpha (ERα) Pvu II 397 T/C Related Genotypes and Alleles are Associated with Higher Susceptibilities of Endometriosis
Authors: Permatasari Vera , Saleh Muhammad Irsan , Nita Sri 
Published: May 2020

Abstract
Endometriosis is an estrogen dependent disease that is proved by its development in reproductive age and the decrease after menopause or ovariectomy. Endometriosis characterized by the growth of endometrial outside the uterine cavity, which is found in women with subfertility and pelvic pain problems. Effect of the estrogen hormone depends on the binding to its receptor. Estrogen receptor alpha (ERα) polymorphisms which admit by Pvu II enzyme restriction has associate to some women’s disease like endometriosis. This Study aimed to determine the correlation between ERα 397 T/C with the risk of endometriosis. There were 70 samples which were divided into 2 groups: 35 cases (endometriosis group) and 35 controls (non-endometriosis group). The determination of genotypes and allotypes used PCR-RFLP method and the data analysis by chi square test α<0,05.The results showed that genotype frequencies of case group are 11,4% TT, 54,3% TC and 12% CC while genotype of control group are 34,3% TT, 51,4% TC and 14,3% CC with p value 0,032. Allele frequencies of case group are 38,6% T and 61,4% C while control group are 60% T and 40% C with p value 0,011. Conclusion: there is a significant correlation between the genotype and allele polymorphism of ERα gene 397 T/C with the risk of endometriosis.
Analysis of Competency Level for Wave Science in General Physics-Based on Literacy Science in PISA
Authors: Sahyar  , Bunawan Wawan , Yanti Jeddah 
Published: May 2020

Abstract
PISA competency framework has been gained global recognition from 2006 and was developed until the latest version in 2015. PISA competency emphasis is classified into three competencies standard, such as explaining scientific phenomena, evaluating and designing scientific inquiry, and interpreting scientific data and evidence, finally, summarizing research findings. All of the PISA’s standard competency is reflected in each of the three types of knowledge that consist of content knowledge, procedural knowledge and epistemic knowledge. PISA science assessment is based on science literacy. This article will analyze the three competencies of PISA science literacy determined by each knowledge in basic physics topics: wave. Furthermore, the subject matter refers to wave phenomenon, types of wave, the magnitude, the formula, superposition of wave, reflection and refraction, resonance, and the energy of wave.
Inventory of Pitcher Plant (Nepenthes sp.) and Its Existence in North Sumatra Indonesia
Authors: Nainggolan L , Gultom T , Silitonga M 
Published: May 2020

AbstractNepenthessp. is a carnivorous plant with unique shape and color shades. This unique plant has a special leaf modification called a pitcher which has the capability in catching insects and small animals. The purpose of this research was to know the types and habitat ofNepenthessp. that found in six regencies in North Sumatra. The pitcher plants inventoried from South Tapanuli, Central Tapanuli, Humbanghasundutan, Toba Samosir, Dairi and Samosir regency in North Sumatra. The research type and method were conducted by descriptive qualitative and survey method research. The morphology data ofNepenthessp. used to identify the types ofNepenthessp. in North Sumatra. Inventory result ofNepenthessp. from six regency showed that there were five original species in North Sumatra namelyNepenthes tobaica,Nepenthes gracilis,Nepenthes ampullaria, Nepenthes eustachya,Nepenthes rhombicaulisand one natural hybrid speciesNepenthes reinwardtiana x spectabilis.Nepenthes tobaica,Nepenthes gracilishad upper and lower pitchers whileNepenthes ampullaria,Nepenthes eustachya,Nepenthes rhombicaulisandNepenthes reinwardtiana x spectabilisjust had an upper or lower pitcher. All species lived in low or high lands and most of them found in peat area, high humidity, and high light intensity.
Development of Stirling Engine Based Thermodynamics Tools
Authors: Hasanah Uswatun , Rahmatsyah  , Ginting Eva Marlina 
Published: May 2020

Abstract
A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas (the working fluid) at different temperatures, such that there is a net conversion of heat energy to mechanical work. In the results of stirling engine experiments obtained that the influence of temperature on the speed of turning the wheel (Rpm) where the more heat the temperature is given, the greater the speed of turning the wheel produced. At a power crank distance of 3.6 cm, the resulting linearity value of 99% is obtained, at a power crank distance of 0.05 cm the linearity value of 98.69% is obtained while at the minimum distance the resulting linearity value of 98.51% is obtained. The effect of the distance of the power crank also affects the rotating speed of the wheels (Rpm) and the generated electrical energy.
Hotel Content-Based Recommendation System
Authors: Wahyudi Kristian , Latupapua Johanes , Chandra Ritchie , Girsang Abba Suganda 
Published: May 2020

Abstract
Content based recommendation system tries to recommend items similar to those a given user has likely in the past, whereas systems designed according to the collaborative recommendation paradigm identify users whose preferences are similar to those of the given user and recommend items they have liked. The proposed recommendation system is discussing about Data finitihotel recommendations for a place across U.S. The selected process for the recommendation is calculating the rating of hotel categories on the city. By calculating hotel categories from several city by combining two features namely categories and taken from the city of the selected hotelcategory as well. The result of process will be recommended hotel with highest ratingto the user.
Syntesis Conductive Polymer from Polypyrrole (PPy) Based Assisted by Polyvinyl Alcohol (PVA) Through Batch Polymerization Technique
Authors: Elita Hafizah M A , Kissinger F , Manaf A , Suparno  , Andreas  
Published: May 2020

Abstract
Polypirrole (PPy) is one of conductive polymer material has been success sinthesized through polymerization process using chemical oxidative reaction by batch polymerization technique. The synthesis was conducted at room temperatur with agitation speed within 300-500 rpm. The certain amount of pirolle monomer was reacted with ammonium persulphate in the aquaeous media. Demineralized water is the only one solvent was involved in the reaction. The presence of 0%, 1% and 2% of Polyvinyl alcohol (PVA) in the synthesis of PPy was investigated. Washing process found maximal after four times washing indicated by FTIR spectrum, phisical appearance, color and conductivity value of the filtrate of residual washing treatment. While the synthesized PPywith presence of PVA obtained higher conductivity compare when PVA free. The conductivity value was 57,000, 56,000 µs/cm for additional 1% and 2% of PVA respectively. It is significantly increased when PVA free involved in the reaction. Other supporting characterization during synthesis was conducted such as pH measurement, density, viscosity, temperature and colour degradation observation. The appearance of PPy when presence PVA is being emulsion and different when absence of PVA which obtained powder or solid form of PPy. Black polymer emulsion with various viscosity of PPy was observed completely.
Science Process Skills Improvement in Medan High School Students Through Inquiry Training Learning Model
Authors: Solikin  , Derlina  , Bukit Nurdin 
Published: May 2020

Abstract
This study aims to improve students’ science process skills that learned by inquiry training learning model. This study is quasi-experimental. The study population were students of class XI SMA Al Fityan Medan. Sample selection is done randomly to randomize the class. The instrument used is a sheet consisting of science process skills such as observation checklist sheet. The results of this study stated that students’ science process skills can improve through the inquiry training learning model through its phases.
Power plant life cycle cost management framework: a literature review
Authors: Wibawa Agus , Ichsani Djatmiko , NurYuniarto M 
Published: May 2020

Abstract
Today, the power plant industry has to operate in the stricter environment, safety, and standards. Hence a power plant needs to address those problem by implementing a sound and good asset management practice to ensure level of power plant performance set are met. Usually the power plant performances set by company are difficult to be met by aging power plants. They are hardly capable of delivering the requested performance due to their operational age. Several questions are raised to deal with the aging power plant such as should the power plant be maintained, improved and or discarded? Those questions are difficult to be answered as for any power plant there were great deal amount of money has been involved since the very beginning of power plant construction until their operation stage. Due to this fact a novel approach on how to deal with the problems is proposed in this paper. A novel framework of assets management will be developed by considering many factors and criteria of power plant performance related to efficiency reliability and economics aspect of the power plant through its entire life. The framework is called as Holistic Operation and Maintenance Excellence (HOME). In this paper, the authors would like to present literature survey related to the HOME framework. It is expected that the will be proposed HOME framework will be capable of dealing with problems raised previously based on the works in the power plant asset management previous research reported in this paper. The HOME framework objectives are integrating power plant asset management, finance (cost), and technical aspect such efficiency, reliability as a guide to make decision during it is service life. The LCM framework to optimize power plant asset in term of fuel, operation and maintenance was provided. Potential gap has been discussed and proposed for next research.
The Basic Acid Scientific Experiment Video and the Separation of Mixed-Based Information Technology
Authors: Ginting Syahfitriani , Sahyar Sahyar , Sudrajat Ajat 
Published: May 2020

Abstract
This research results in a video of scientific experiments worthy of use, resulting in a video of scientific experiments that is practical to use. The video is a video-based scientific experiment and a mixture of information technology. The development model in the study uses the Borg & Gall development model which is adapted into a simple model. The results showed the validation of material experts with very decent categories, media experts with very decent categories, small group tests with very practical categories, and field trials with categories very practical.
The Effectiveness of Natural Science Modules Based on Guided Inquiry Method in Elementary School Learning
Authors: Yani Fitri , Bukit Nurdin , Manurung Sondang R. 
Published: May 2020

Abstract
This research is kind of development research (Research and Development) which aims to determine the effectiveness of natural science modules based on guided inquiry method that is developed. The development of natural science modules use ADDIE theory (Analyze, Design, Development, Implementation, and Evaluation). Analyzing data using descriptive qualitative technique that expressed in students score and score scale category. This development research produces products that meet the eligibility requirements with the results of the validation of the material declared very effectivity and the designer is effective and the linguist is declared suitable at this theory. The results are students give a good response of natural science module based on guided inquiry method while the teacher gives a good response on it and the method is effective.
Callus Induction of Mangosteen (Garcinia mangostana L.) In Vitro with Addition of Growth Regulators
Authors: Astuti Ririn Dwi , Harahap Fauziyah , Edi Syahmi 
Published: May 2020

Abstract
This research was conducted to determine the best combination of plant growth regulators on callus induction of shoot explants mangosteen (Garcinia mangostana L.). The research used complete randomized design (CRD) which is consisting of 12 treatments with 3 times repetitions. The parameters observed were time of callus formation, callus texture, callus color, callus pile height, callus surface area, callus weight, and callus performance. Data was analyzed by using ANOVA, and DMRT as follow up. The result showed that addition of plant growth regulators have effect on callus induction of shoot explant mangosteen (Garcinia mangostana L.). The best concentration and composition of media for induction of mangosteen callus is by giving sucrose 1,5 g / L + 2,4D 3 ppm because it was able to produce callus with the fastest time with a compact texture and color that is identical to green and white. The callus has 0.67a cm in height, 1.70a cm2 in width, and 0.51a g in weight. The callus performance is growing all over the surface.
The Profile of Pempek as a Determining Factor of Quality, Originality and Ethnicity
Authors: Supriadi A , Saputra D , Priyanto G , Baehaki A , Pambayun R 
Published: May 2020

Abstract
Pempek is a traditional ethnic food originated from Palembang, South Sumatra, Indonesia. Currently, there is not exist any profiles which could be used as a determining factor for quality, originality, and ethnicity of pempek. The objective of this research was to obtain the chemical profile of pempek as a determining factor of quality, originality and ethnicity. The samples were collected from the ten famous branded vendors in Palembang. The fish used in making pempek of the samples are snake head fish, Spanish mackerel, and the mix of snake head and Spanish mackerel. The type of pempek used in this experiment was steamed cook pempek lenjer (cylindrical) type. The analysis was performed at a KAN accredited laboratory. It was found that the energy content of pempek used in this experiment was in the range of 125 to 160 kkal/100 g sample and all the pempek used had a 0% of fat. All pempek used had 17 types of amino acid, and all of them had an essential amino acid. The significant finding was that the concentration of glutamic acid was 200% of the concentration of common concentration which indicated that all the vendors used artificial mono-sodium glutamate to improve the taste of pempek. It was concluded that the chemical profile found on this research could be used as database for creating a standard of identity of pempek.
Development Of Interactive Multimedia Lectora Inspire Problem Based On Science
Authors: Hikmi R , Simorangkir M , Sudrajat A 
Published: May 2020

Abstract
This research is a type of research development Research & Development (R&D) using the ADDIE model with quantitative and qualitative approaches applied in schools. This study aims to develop multimedia Lectora Inspire Problem Based in the field of science, knowing the feasibility of using multimedia, knowing the user’s response in using the multimedia. Based on the testing of the feasibility of the multimedia and the field of science carried out by 2 material expert validators and 1 multimedia expert validator, it was found that the multimedia Lectora Inpire developed according to experts was declared feasible and could be used as multimedia learning in the field of science.
Coastal waste bank as a waste processing effort towards a clean and productive Bagan Deli
Authors: Siregar Etti Sartina , Jamilah It , Muhammad Farchan , Saragih Apnila Putri , Sri Hastuti Liana Dwi 
Published: May 2020

Abstract
Trash is still a problem that the solution still continues to innovate until now. Based on information by the Ministry of Environment and Forestry (KLHK), the Republic of Indonesia has released a list of cities in Indonesia based on its cleanliness level. The Deli River is one of the garbage prone spots, and the waste will accumulate and surely will pollute the environment, all garbage is in the downstream or middle, all will be down to Bagan Deli village which eventually all the garbage will be Sources of pollution and disease for communities in Bagan Deli village. Programs with waste banks have been encouraged, but the management and facilities are still lacking, with community service is expected to understand the importance of maintaining environmental hygiene and utilizing waste as a source of and able to manage the waste bank as a new search eye, sorting based on the categories of till that are more detailed and specific so as to provide convenience during the presses, also will be made miniature garbage bank counter to Well-coordinated fitting management. The result of the Survet shows the level of customer satisfaction of the Trash bank belongs to the category quite well, and need some evaluation for the improvement of Waste Bank. The last will be created special training on how to create another pilot waste bank in other environment in the Kelurahan Bagan Deli
In Vitro Multification of Dendrobium sp. with Plant Growth Regulator
Authors: Harahap Mislah S. , Harahap Fauziyah , Edi Syahmi , Rosmayati  
Published: May 2020

Abstract
Orchids are plants that has aesthetic value and high economic important. Included to ornamental plant whose existence is diminishing and endangered. To preserve this plant, it needs to in vitro thchnique. The aim of this study was to determine the best interaction of growth regulator Benzyl amino purine, coconut water and the interaction of both multiplication of Dendrobium sp. The research method used a completely randome design with various concentrations of Benzyl amino purine (BAP; 0,1,2,3 mg/L) and coconut water concentrations (0%,5%,10%). The parameter observation are number of buds, leaves and roots. The data were analyzed descriptively and inferentially with ANOVA. The results shows the real effect of BAP interaction, between coconut water buds and leaves, but did not significantly affect the number of roots. Within 12 weeks of observation the highest number of buds and leaf obtained from a combination of 5% coconut water + BAP 0 mg/L were 12.00 and 5.00. The lowest number of buds and leaves was obtained in combination of 5% coconut water + BAP 2 mg/L, 6.00 and 1.00.