bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optical and Morphological Properties of ZnO Nanostructure by Coating Aluminium and Plasmonic Material
Authors: Abdi Rinaldo , Syahputra Romi F , Kurniawan Ridho , Awitdrus  , Iwantono  
Published: December 2019

Abstract
We provide a preliminary study of ZnO nanostructure synthesis by coating aluminium and metallic plasmonic Au-Ag using seed mediated hydrothermal method. The growth process is carried out on the FTO substrate and characterized using UV-Vis, XRD, FESEM and EDX spectrophotometer system. The UV-Vis spectrum shows that strong absorption occurs at wavelengths around 370 nm, for all samples. The XRD pattern shows three diffraction peaks at angles 2θ = 34.43°, 36.32° and 47.49°. Each peak corresponds to the crystal fields of (100), (002) and (101). Morphology of the samples shows the presence of ZnO nanorod. A compact and denser nanostructure also obtained.
Screening of antagonistic fungi from Etlingera littoralis (J.König) Giseke rhizome in Sibolangit Forest, North Sumatra
Authors: Lutfia Anisa , Munir Erman , Yurnaliza  , Basyuni Mohammad 
Published: December 2019

Abstract

Etlingera littoralis (J.König) Giseke is a medicinal plant species from Zingiberaceae in North Sumatra, Indonesia. The species has close relationship to Etlingera elatior with less-known potential and information on its microbial associates. Endophytic fungi were screened and explored through various species of Zingiberaceae with the aim of finding antagonistic fungi against pathogenic bacteria. Isolation of endopytic fungi was based on surface sterilization and direct plating of rhizome part into isolation medium. Endophytic fungal isolates were characterized based on its morphological characteristics. Antagonism assay was employed against representative pathogenic bacteria: Staphylococcus aureus (ATCC® 29213™), Methicilin-resistant Staphylococcus aureus (ATCC® 43300™), Escherichia coli (ATCC® 25922™), and Enteropathogenic E. coli K11. We obtained six endophytic fungal isolates which were antagonists to at least one of tested pathogen. Majority of isolates produced antagonistic activities against S. aureus while only one isolate, namely Eel05SU was known to inhibit all tested pathogenic bacteria. Identification of potential isolate is currently carried out to gain information of its identity along with deeper investigations of its biological properties.
Total Phenolic Content of Oil Palm Roots (Elaeis Guineensis Jacq.) As Preliminary Health Indicators in Oil Palm Plantation
Authors: Yurnaliza Yurnaliza , Nurwahyuni Isnaini , Lenny Sovia , Rizal Emilia , Wirandi Diki , Harahap Nirwana Fazri , Lutfia Anisa , Hartanto Adrian 
Published: December 2019

Abstract
Phenol and its derivatives are known as major phytochemical compound incorporated in plant defense or resistance. Oil palm (Elaeis guineensis Jacq.) is an important oil-producing species which prone to infection caused by Ganoderma boninense Pat., causing basal stem rot to the plant. Oil palm may accumulate or secrete related phenolic compounds into rhizospheric region as early mechanism in plant defense against G. boninense. This study investigated the role of total phenolic content in oil palm roots as an indicator to health status of plant in plantation. Oil palm roots were sampled from four representative plantations namely Kuala Bekala (KB), Medan Johor (MJ) from Medan city and Bilah Barat (BB), Kualuh Hulu (KH) from Labuhan Batu district. Phenol concentration was measured using Folin-Ciocalteau colorimetry method, expressed as μg GAE/mL from four different root macerates, using 100% MeOH, 100% MeOH with sonication, 80% MeOH and sterile distilled water (H2O). The results showed that phenolic compounds were higher in healthy than diseased plant. Solvent 80% MeOH was considered as the best solvent in extracting phenolic compounds both from diseased and healthy plants (P < 0.001) both quantitative and qualitatively. The differences of phenol content in oil palm roots may then reflect the fitness status of plant in the presence or absence of G. boninense.
Surfactant, Nitrogen and Carbon Media Optimization for Trichoderma Asperellum LBKURCC1 Laccase Production by Flask Solid State Fermentation of Rice Straw
Authors: Rahayu A G , Utama P S , Nurulita Y , Miranti M , Nugroho T T 
Published: December 2019

Abstract
Laccase is an important industrial enzyme used in the paper, food and textile industry. It is produced by many different organisms, including filamentous fungi. Trichoderma asperellum LBKURCC1 is a strain isolated from Riau soil, which can produce laccase by solid state fermentation (SSF) of rice husk and rice straw. The aim of this work was to optimize SSF production of laccase from rice straw, through optimizing Nitrogen, Carbon and surfactant supplements to the fermentation media. Effect of surfactant, nitrogen supplement, and carbon supplement were evaluated by using a Central Composite Design (CCD) and surface response analysis. The concentration of the surfactant, Tween-20, at all concentration levels tested had no significant effect to the model. In contrast, the nitrogen and carbon supplement concentrations were significant factors (P-Value<0.05) enhancing laccase production. Optimum conditions for laccase production were 23 g/L nitrogen and 1% carbon supplement, giving a maximum laccase activity of 56.8 U/L enzyme extracted, equivalent to 0.7 U per g rice straw fermented. Optimizing the nitrogen and carbon supplement increased yields up to 3 times the level obtained in a non-optimized media.
The Tremendous Catalytic Activities of the Cryptomelane-Type Manganese Oxide Octahedral Molecular Sieve Prepared Without Calcination Process for Degradation of Methylene Blue
Authors: Leorita N , Siregar S S , Anggraini R , Nurhayati  , Awaluddin A 
Published: December 2019

Abstract
The cryptomelane-type manganese oxides octahedral molecular sieve with different crystalline phases have been successfully synthesized and characterized. The oxides were synthesized using precipitation method through the redox reaction between KMnO4 and C6H8O7 with a mole ratio of 5:1 by the variation of flow rates (1, 2, and 3 mL/min). The prepared catalysts were characterized by XRD to determine their phase structures, purity, and crystallinity. The XRD results indicated that the samples without heat treatment (calcination) displayed the poor tunnel structures of cryptomelane-type manganese oxides with low intensities and broad peaks. Upon the thermal treatment at 600°C for 4 hours, the much more crystalline phases of similar cryptomelane structures were obtained. The high flow rate results in the more crystalline cryptomelane for calcined samples, whereas the flow rate has no substantial influence on the crystallinity of uncalcined samples. The catalytic activities of both oxides were evaluated for the degradation of methylene blue (MB) with H2O2 as an oxidant. The catalytic degradation of MB greatly enhanced using the uncalcined cryptomelane compared to calcined cryptomelane. The high flow rate has a positive impact on the degradation of MB for calcined samples, but the effect of flow rate results in the higher degradation of MB until a certain flow rate. The 98.4% degradation of MB was achieved by uncalcined samples under the optimum condition.
Scientific Contexts in Pre-Service Elementary Teacher-Designed Mathematics Picture Books
Authors: Putra Zetra Hainul , Witri Gustimal 
Published: December 2019

AbstractMathematical literacy is a key point of the PISA study, and students are expected to deal with mathematics in a variety of contexts. A scientific context is one among four areas that could challenge students to understand mathematics and link between mathematics and sciences. Therefore, this study aims to investigate the scientific contexts from two mathematics picture books (MPB1 and MPB2) designed by two groups of pre-service elementary teachers in 2015. The content analysis is used as a research method to evaluate the spectrum of the scientific contexts and how they relate to mathematics contents. The findings show that MPB1 is designed based on an environmental issue, go green, while MPB2 based on farm environment. While the mathematical content of MPB2 is more challenging than MPB1 because it requires students’ mathematical problem-solving.
Effects of Variations in Pipe Leakage Diameter and Pipe Leakage Distance to the FFT Diagrams
Authors: Wijayanto Andrey Putra , Made Miasa I 
Published: December 2019

Abstract
A method for detecting leaks in plastic water supply pipes through analysis of the pipe’s surface vibration using an accelerometer is proposed. Various diameter of leaks and distance of leaks are examined. The method involves identification of the changes vibration spectrum in Fast Fourier Transform (FFT) diagram caused on the pipe by various leak scenario. It is showing that FFT diagram on pipe small leak is difficult to be distinguished with FFT diagram with pipe no leak scenario. However, pipe big leak shows narrow frequency dominant in FFT diagram with high values on acceleration. The further leakage points from accelerometer, trend of frequency dominant in the FFT diagram is getting lower.
Development of Microcontroller-Based Straight Motion Experiment Devices
Authors: Elyana  , Azizahwati  , Islami Nur , Rahmad M. 
Published: December 2019

Abstract
Learn to pronounce
This study aims to design a straight-motion experimental device using an Arduino Uno microcontroller to produce accurate data. The method used in this research is the Research and Development (R&D) research method. The model used is the development of a 4-D model. The 4-D (Four D) development model is a development model of learning tools. Based on data analysis, it can be concluded that this study has successfully designed a timer using a microcontroller to be developed as an alternative learning media in accurately calculating the time of a straight moving object.
Development of Video with Discovery Learning Models as a Reference for Teachers in Implementation Curriculum 2013
Authors: Salam S , Roza Y , Maimunah  , Siregar S N 
Published: December 2019

Abstract
Discovery learning model is one of the recommended models to be used for Curriculum 2013 implementation, yet many teachers have difficulty in using this model because of no experience and need the model. The purpose of this research is to develop Video for a teacher as a reference in implementing discovery learning models. This development research uses the FOUR-D model with stages Define, Design, Develop and Dissemination. This video uses the teacher as a model with real class situations. Learning is done by the teacher using the discovery learning model. The video shows the stages of discovery learning model that the teacher must do. The video was displayed to 28 mathematics teachers and they were asked to fill out a questionnaire to provide an assessment of the video in terms of format, content, and language. The results of the questionnaire analysis showed an average score of 3.64 for the format aspect, 3.67 for the content and 3.59 for the language aspect. The teachers mentioned that this video helps them to learn the implementation of discovery learning. This video can be used by any teacher especially mathematics teachers as the model in using discovery learning.
Vibration Analysis For Reducing Excessive Vibration Level on Gas Turbine Generator (GTG) 100 MW in Cogeneration Power Plant
Authors: Reksono Matsaid Budi , Miasa I Made 
Published: December 2019

Abstract
The goal of this research was to gather knowledge and to analyze the problem of excessive vibration level of Gas Turbine Generator (GTG) 100 MW system installed in cogeneration power plant in Sumatra Island, Indonesia which supports one of biggest oil and gas industries in Indonesia. The case research related to vibration problem were presented to diagnosis the main causes of excessive vibration that occur in the gas turbine generator during operation. Vibration analysis is one of the most important activities in predictive maintenance. Vibration monitoring system and machinery diagnostic technical specification are presented. The vibration data of this research were collected using online vibration monitoring system Bently Nevada 3500 series and system 1® display software at different bearing locations during transient (shutdown & start-up and steady state (on-line) condition. Assessment on overall vibration levels shall refer to Original Equipment Manufacturer (OEM) alert & danger set points, as well as relevant ISO 20816-2 standard. Finally, recommendation of reducing excessive vibration level is provided to ensure safe and reliable operation of the GTG unit.
Increasing the Comfortable Feel for Pregnant Women Through the Endorphin Massage
Authors: Hartati Rista , Rahayu Ary Oktora Sri , Tanberika Fajar Sari , Islami Annisa Permata 
Published: December 2019

Abstract
Mostly pregnant women suffered back pain. Based on a preliminary studies conducted by researcher in the Tarai Bangun, 15 pregnant women in third trimester said that they had back pain. Back pain can be overcome, one of which is by doing an endorphin massage that can make the mother relax and reduce the pain felt. This study aims to determine the effectiveness of endorphin massage on back pain in pregnant women. The study design used was Quasy Experiment with a non-equivalent control group design which it divided into an experimental group and a control group. The sample was 34 respondents using purposive sampling technique. The measuring instrument used in both groups was the Numeric Rating Scale pain scale. Data analysis used dependent t test and independent t test. The results showed that there were differences in back pain scores before and after endorphin massage in the experimental group, so it can be concluded that endorphin massage is effective against back pain in pregnant women with a p value of 0.001 (p <0.05). The results of this study can be used as a reference to using endorphin massage as a way to deal with complaints of back pain in pregnant women.
Application of Geoelectrical Resistivity Methods for Mapping of Seawater Intrusion
Authors: Azizah Nurul , Pratiwi Nadya Hari , Islami Annisa Permata , Islami Nur 
Published: December 2019

Abstract
Excessive land exploitation in Dumai has been replaced by intrusion seawater in aquifers in the coastal area. This is indicated by the increasing number of society’s wells that turn into brackish. The intrusion has a wide impact on various aspects of life, such as decreasing soil fertility, damage the buildings, and disrupting public health. The aim of this study is to find out the saturated zone of water and the interface of water with fresh water, so it is known that water zones are suitable for daily use. The study used Geoelectrical Resistivity Survey with 1D Schlumberger configuration to determine the zone of aquifer and its thickness. Based on the research that has been done, the results of the boundary of the intrusion zone in Dumai were obtained that there is an intrusion zone boundary of seawater content. This is indicated by the low resistivity value. It is less than 10 ohms, which is found at the zone of less than 1 km from the beach line.
The Effect of Sun Light Intensity on the Growth of Azolla Nicrophylla and its Symbiont Anabeana Azollae in Brackish Water
Authors: Effendi Irwan , Pranata Aditya , Feliatra  
Published: December 2019

Abstract

Azolla microphylla is is a tropical and subtropical fern with a length of 1.5-2.5 cm that can be used as an organic fertilizer so that it can meet nutrient needs, especially for plants. The fern has a simbiont Anabaena azollae which can fix N2 freely in the air so that it can contribute to the need for N for plants in the soil. This research is aimed to study the effect of sunlight intensity on the growth of A. microphylla and its symbiont An. azollae in brackish water. A two factors (factor a; light intensity and factor b; duration of cultivation) completely randomized design was applied to the experiment. Sunlight intensity composed of 0, 30, 50, 70 and 100 %. Duration of cultivation consisted of 0, 7, 14, and 21 day. Every unit of experiment was setted in a 100 × 100 × 20 cm plastic coated wood box, filled with brackish water of 3 ppt salinity up to 15 cm depth and 1 kg fermented cow dung, mixed gently and seeded with approximately 1 gram of fresh A. microphylla. Every box was covered with some pieces of wood based on its light intensity. Growth of the fern was measured by counting the number of the fern colony directly and weighted with analitycal balance. While growth of An. azollae were counted by using sedwick rafter counting cell. It is concluded that the sunlight intensity significantly influences the growth of A. microphylla and its symbionts An. azollae. The best sunlight intensity was 70%. A dinamic growth recorded during the first week post inoculation in which dobling time toke place. It is recomended to grow A. microphylla and its symbionts An. azollae under 70 % of the sunlight intensity
Effect of Time Fermentation and Saccharomyces Cerevisiae Concentration for Bioethanol Production from Empty Fruit Bunch
Authors: Siregar Josua Sugandi , Ahmad Adrianto , Amraini Said Zul 
Published: December 2019

Abstract
Bioethanol is new renewable energy using the fermentation process from a substrate containing glucose. One of the materials which can convert to bioethanol is empty fruit bunch, which is in large amount in Indonesia. The plantation of palm oil has empty fruit bunch waste as much 23.988.293 tons in a year. The conversion from an empty fruit bunch to bioethanol also helps to reuse the waste which is not useful. There are a few steps to get bioethanol from an empty fruit bunch that is delignification of empty fruit bunch pollen using KOH solution which makes from empty fruit bunch ash getting from an incinerator. And then purification of pollen using H2O2 3% solution, hydrolysis cellulose becomes glucose solution using H2SO4 1% in process condition 100 °C and 60 minutes. Fermentation using temperature condition 30 °C, and stirring in 250 rpm. The variation of yeast Saccharomyces cerevisiae concentration which is 4 g/L, 6 g/L, and 8 g/L. And time variation in 0, 24, 48, 72, 96, and 120 hours. The research result is shown that maximum glucose from hydrolysis is 112,44 g/L. And the highest bioethanol concentration from the process is 5,5% (v/v) or 41,411 g/L in yeast concentration 6 g/L and 96 hours.
Wastes Analysis to Improve the Productivity and Sustainability in Manufacturing Industry
Authors: Susilawati Anita , Tasri Adek , Arief Dodi Sofyan , Yohanes  
Published: December 2019

Abstract
The eliminate wastes in manufacturing processes can be reinforcement for achieving sustainable manufacturing industry. This paper proposed to develop a framework to analyze an Overall Equipment Effectiveness (OEE) implementation to eliminate wastes for productivity improvement, and it’s correlated to sustainability in manufacturing Industry. An analyze wastages in term OEE is used the six big losses i.e. equipment failure, setup and adjustment loss, idling and minor stoppage, reduced speed, defects in process and reduced yields. The framework employed the Fuzzy AHP (Analytic Hierarchy Process) based OEE measurement. The case study from a crude palm oil manufacturing company was presented to strengthen the proposed method. Therefore, the framework can assist the top management in the company to decide the priorities to increases productivity and it’s correlated to manufacturing sustainability.
How Do Primary Teachers Develop Students’ Problem-Solving Skills to Construct Environmental Concepts?
Authors: Somantri M , karim A Abdul , Disman D , Komalasari K , Hermita N 
Published: December 2019

Abstract
The purpose of this study is to describe the skills of teachers to develop the problem-solving skills of elementary school students in grade V. One of the competencies is very important possessed by teachers, teachers must have the skills to optimize the problem-solving skills of students from an early age, so students are able to solve all the problems he faces. awakening the domain of another learners’ development. The design of this type of research is descriptive-quantitative, data netted through observation and interview instruments to collect data from two elementary school teachers in Bandung, Indonesia. The results showed that the development of problem-solving skills in the concept of the environment in primary school grade V was not optimal. That was caused, the skills of teachers in designing learning that can stimulate students’ problem-solving skills on environmental concepts is still low. These findings can provide information to academics and policymakers to create solutions to improve the skills of teachers in designing 21st-century learning, especially problem-solving learning.
The Power Spectral Density Based on Waveform Analysis for Computing Noise Level
Authors: Rumapea Humuntal , Sinambela Marzuki , Sitepu Surianto , Silitonga Nogar , Jaya Indra Kelana 
Published: December 2019

Abstract
Digital signal recordings in the waveform bands contain the noise, which importantly can be attributed to ambient and instrumental noise of recording system. We not only used the power spectral density (PSD) method but also computing the waveform spectral to knows a new model and performance based on recordings of KLNI (Mataram, NTB, Indonesia) and TWSI (Taliwang, NTB, Indonesia) stations from the entire BMKG Network made over 1 month period on August 2018. These cumulative PSD plots are generated, the good performance of each station based on the representative bedrock and cite of the noise level. The KLNI and TWSI stations have the highest background noise level.
Design information seating chart system in classroom with wireless sensor network
Authors: Adam Hikmah Adwin , Julham  , Lubis Arif Ridho , Fachrizal Ferry , Fatmi Yulia 
Published: December 2019

Abstract
The seating chart created in the classroom is one way for teachers in the class to remember students’ names one by one and by remembering students’ names, it means there is a teacher concern [4][5]. In addition it becomes the basis for developing sense of community in classroom [4][5]. In this paper discusses combination of computers and wireless sensors to make information seating chart system digitally in classroom. The system will be updated automatically if a student sits down a seat. Sensor section was placed to the student’s seat and server section was used to display seating chart to teacher. It was working as planned. This was evidenced by the stored data (the seat’s number and RFID code of the student’s card) into the MySQL database on the server. The future work will create a Graphical User Interface to be installed the server, so that teacher will use it easy.
Decision Support System for Quran Teacher Selection Using Profile Matching Method on TPQ Anbata
Authors: Kurniawan Helmi , Tanti Lili , Fujiati  , Agustin Fhery , Rahmad Iwan Fitrianto 
Published: December 2019

Abstract
Al-Quran Reading Park (TPQ) Anbata is a reading park with a Quranic learning system that has an educational system of recitation values, reading fluency, Adab Values Reading reading, Attitude Values and Worship Value. The selection of the Koran teacher in the Anbata Al-Quran Reading Park (TPQ) is through a rigorous selection to guarantee the quality of its students. But sometimes these things are relatively balanced, causing new problems, namely the difficulty of determining the right quran teacher to be positioned as a teacher. Therefore a Decision Support System is needed that can provide recommendations for considering the selection of Quran teachers. In this case using the Profile Matching method. The method works by using the level of importance of a value needed to become a quran teacher. Calculations on this method produce the best value that meets the assessment criteria to be used as a recommendation for the selection of quran teachers in the Anbata Al-Quran Reading Park (TPQ).