bluuebunny/crossref_metadata_2025 huggingface dataset:
PQLC2 recruits the C9orf72 complex to lysosomes in response to cationic amino acid starvation
Authors: Amick Joseph , Tharkeshwar Arun Kumar , Talaia Gabriel , Ferguson Shawn M.
Published: December 2019

The C9orf72 protein is required for normal lysosome function. In support of such functions, C9orf72 forms a heterotrimeric complex with SMCR8 and WDR41 that is recruited to lysosomes when amino acids are scarce. These properties raise questions about the identity of the lysosomal binding partner of the C9orf72 complex and the amino acid–sensing mechanism that regulates C9orf72 complex abundance on lysosomes. We now demonstrate that an interaction with the lysosomal cationic amino acid transporter PQLC2 mediates C9orf72 complex recruitment to lysosomes. This is achieved through an interaction between PQLC2 and WDR41. The interaction between PQLC2 and the C9orf72 complex is negatively regulated by arginine, lysine, and histidine, the amino acids that PQLC2 transports across the membrane of lysosomes. These results define a new role for PQLC2 in the regulated recruitment of the C9orf72 complex to lysosomes and reveal a novel mechanism that allows cells to sense and respond to changes in the availability of cationic amino acids within lysosomes.
Experimental time resolution limits of modern SiPMs and TOF-PET detectors exploring different scintillators and Cherenkov emission
Authors: Gundacker Stefan , Martinez Turtos Rosana , Kratochwil Nicolaus , Pots Rosalinde Hendrika , Paganoni Marco , Lecoq Paul , Auffray Etiennette
Published: December 2019

Solid state photodetectors like silicon photomultipliers (SiPMs) are playing an important role in several fields of medical imaging, life sciences and high energy physics. They are able to sense optical photons with a single photon detection time precision below 100 ps, making them ideal candidates to read the photons generated by fast scintillators in time of flight positron emission tomography (TOF-PET). By implementing novel high-frequency readout electronics, it is possible to perform a completely new evaluation of the best timing performance achievable with state-of-the-art analog-SiPMs and scintillation materials. The intrinsic SiPM single photon time resolution (SPTR) was measured with Ketek, HPK, FBK, SensL and Broadcom devices. Also, the best achieved coincidence time resolution (CTR) for these devices was measured with LSO:Ce:Ca of

mm3 and

mm3 size crystals. The intrinsic SPTR for all devices ranges between 70 ps and 135 ps FWHM when illuminating the entire

mm2 or

mm2 area. The obtained CTR with LSO:Ce:Ca of

mm3 size ranges between 58 ps and 76 ps FWHM for the SiPMs evaluated. Bismuth Germanate (BGO), read out with state of-the-art NUV-HD SiPMs from FBK, achieved a CTR of 158

ps and 277

ps FWHM for

mm3 and

mm3 crystals, respectively. Other BGO geometries yielded 167

3 ps FWHM for

mm3 and 235

5 ps FWHM for

mm3 also coupled with Meltmount (n  =  1.582) and wrapped in Teflon. Additionally, the average number of Cherenkov photons produced by BGO in each 511 keV event was measured to be 17

3 photons. Based on this measurement, we predict the limits of BGO for ultrafast timing in TOF-PET with Monte Carlo simulations. Plastic scintillators (BC422, BC418), BaF2, GAGG:Ce codoped with Mg and CsI:undoped were also tested for TOF performance. Indeed, BC422 can achieve a CTR of 35

2 ps FWHM using only Compton interactions in the detector with a maximum deposited energy of 340 keV. BaF2 with its fast cross-luminescence enables a CTR of 51

5 ps FWHM when coupled to VUV-HD SiPMs from FBK, with only  ∼22% photon detection efficiency (PDE). We summarize the measured CTR of the various scintillators and discuss their intrinsic timing performance.
Markovian treatment of non-Markovian dynamics of open Fermionic systems
Authors: Chen Feng , Arrigoni Enrico , Galperin Michael
Published: December 2019

We show that an open fermionic system coupled to a continuous environment with unitary system-environment evolution can be exactly mapped onto an auxiliary system consisting of the physical fermion system and a set of discrete fermionic modes subject to non-unitary Lindblad-type system-modes evolution in such a way that reduced dynamics of the fermionic system in the two cases are the same. Conditions for equivalence of reduced dynamics in the two systems are identified and a proof is presented. Our study extends recent work on Bose systems (Tamascelli et al 2018 Phys. Rev. Lett. 120 030402) to the case of open quantum Fermi systems and to multi-time correlation functions. Numerical simulations within a generic junction model are presented for illustration.
Efficient generation of nitrogen vacancy centers by laser writing close to the diamond surface with a layer of silicon nanoballs
Authors: Rong Youying , Ju Zhiping , Ma Qiang , Liu Shikang , Pan Chengda , Wu Botao , Shen Si , Wu E
Published: December 2019

We proposed a method to effectively fabricate negatively charged nitrogen vacancy (NV−) centers close to the diamond surface by applying femtosecond laser writing technique. With a thick layer of silicon (Si) nanoballs coated, diamond surface was irradiated by high-fluence femtosecond laser pulses. A large number of NV− centers were created around the laser ablation crater area without thermal annealing. The distribution of the NV− centers was expanded to about 50 μm away from the crater center. To demonstrate the function of Si nanoballs, we performed the exactly same laser illumination process on the bare region of the sample surface. In this case, only a few NV− centers were generated around ablation crater. At distance of 32 μm away from crater centers, the NV− density for the case with nanoballs was up to 15.5 times higher compared to the case without nanoballs. Furthermore, we also investigated the influence of laser fluence and pulse number on the NV− density for the case with Si-nanoball layer. Finally, the formation mechanism of NV− centers and the role of Si nanoballs were explained via Coulomb explosion model. The method is demonstrated to be a promising approach to efficiently and rapidly fabricate NV− centers close to the surface of the diamond, which are significant in quantum sensing. Furthermore, the results provide deep insights into complex light-matter interactions.
Flat-band many-body localization and ergodicity breaking in the Creutz ladder
Authors: Kuno Yoshihito , Orito Takahiro , Ichinose Ikuo
Published: December 2019

We study disorder-free many-body localization in the flat-band Creutz ladder, which was recently realized in cold-atoms in an optical lattice. In a non-interacting case, the flat-band structure of the system leads to a Wannier wavefunction localized on four adjacent lattice sites. In the flat-band regime both with and without interactions, the level spacing analysis exhibits Poisson-like distribution indicating the existence of disorder-free localization. Calculations of the inverse participation ratio support this observation. Interestingly, this type of localization is robust to weak disorders, whereas for strong disorders, the system exhibits a crossover into the conventional disorder-induced many-body localizated phase. Physical picture of this crossover is investigated in detail. We also observe non-ergodic dynamics in the flat-band regime without disorder. The memory of an initial density wave pattern is preserved for long times.
Electronic structure of correlated topological insulator candidate YbB6 studied by photoemission and quantum oscillation
Authors: Zhang T , Li G , Sun S C , Qin N , Kang L , Yao S H , Weng H M , Mo S K , Li L , Liu Z K , Yang L X , Chen Y L
Published: December 2019

Angle-resolved photoemission spectroscopy (ARPES) and torque magnetometry (TM) measurements have been carried out to study the electronic structures of a correlated topological insulator (TI) candidate YbB6. We observed clear surface states on the [001] surface centered at the

Γ
¯

and

M
¯

points of the surface Brillouin zone. Interestingly, the fermiology revealed by the quantum oscillation of TM measurements agrees excellently with ARPES measurements. Moreover, the band structures we observed suggest that the band inversion in YbB6 happens between the Yb5d and B2p bands, instead of the Yb5d and Yb4f bands as suggested by previous theoretical investigation, which will help settle the heavy debate regarding the topological nature of samarium/ytterbium hexaborides.
The Sound Representation of an Opera House’s Orchestra Pit: The Stereo Dipole Technique
Authors: Vodola V
Published: December 2019

By using 2 or 4 loudspeakers, the stereo dipole technique is able to realize the virtual sound field of an auditorium in an anechoic listening room. Making use of binaural impulse responses (BIRs) measured in the auditorium and the auralization technique, the virtual BIR can be generated. The accuracy of the sound representation is investigated by comparing the real and virtual BIRs. For a well-diffused sound field like concert halls, this technique enables a highly accurate representation of the sound field. Yet, when the sound source is in the small regularly shaped enclosures like an orchestra pit of an opera house, a peculiar amplification contained in the low-frequency range of the measured BIR is still more emphasized in the virtual BIR disturbing the linear sound representation. This study aims for the solution to this problem.
On the 3D Acoustic Analysis in UNESCO Sites: The Example of San Vitale, Ravenna, Italy
Authors: Vodola Vincenzo
Published: December 2019

The study and analysis of the sound field’s 3D properties has been strongly enhanced in recent years after spatial properties of sound propagation have been acknowledged to be important during the design or correction of theatres and auditorium. Besides, a proper assessment of spatial accuracy is requested for 3D sound reproduction systems, initially designed for acoustical virtual reality and now also employed in the entertainment/cinema industry. Often only monoaural or binaural measurements are performed by means of omnidirectional microphones and dummy heads, although international standards like ISO 3382/1:2009 also define some “truly spatial” parameters such as JLF and JLFC. Even though the two latter parameters are derived from measurements made with a pressure velocity (p/v) microphone, they still represent a 2-channel measurement. 3D Impulse Responses (4-channel B-format) have for many years been measured and employed for sound reproduction. Recently, higher-order 3D Impulse Responses have been measurable thanks to the availability of compact microphone arrays employing a much larger number of transducers. In this paper, a procedure for measuring and analyzing the complete spatial sound information is presented, which is aimed to create easy-to-understand images and videos showing the direction-of-arrival of the room reflections. The description of this technique is emphasized and applied in the Basilica of San Vitale, Ravenna, Italy, which represents one UNESCO site.
Study of Groundwater in the Rock Area Using Geoelectric Survey
Authors: Juandi M
Published: December 2019

Investigation of underground water becomes very important because it involves human life. The difficulty experienced by the community is the limited potential of underground water, this is due to the uneven distribution of underground water in an area. The purpose of this study is to investigate the presence of groundwater in subsurface rock areas. Groundwater investigations around the bedrock have been successfully carried out using the geoelectric method. The geoelectric survey with Schlumberger configuration was carried out in the investigation area. The results of the study have been observed zones that contain groundwater around rocks with varying thicknesses of 73.25 meters and 119 meters.
The Renovation of the Teatro Nuovo in Spoleto: Analysis of the Acoustic Quality of an Italian Opera House
Authors: Vodola V
Published: December 2019

After a complete renovation work and a structural and functional improvement, the Teatro Nuovo has been returned to the city of Spoleto (Italy) and its audience as a renewed venue for the renowned global “Two Worlds Festival.” The restoration works of the theatre started in 2003 to improve safety levels and the operational functionality of the machines on the stage, including acoustic performances, to meet the current needs of the show. The local authorities (Umbria Region) committed the University of Bologna for collaborating with the Teatro Nuovo, in order to analyse and improve its acoustic quality. Two acoustic measurement campaigns, respectively before and after restoration of the theatre, were carried out in order to monitor the Concert Hall’s acoustic performance, verifying the preservation of its original acoustic features. In order to control both monoaural and spatial sound distribution, the ESS pre-equalized signal, emitted by means of an omnidirectional loudspeaker, was recorded using a dummy head and a Soundfield probe. The results of the measurements of every campaign are presented and evaluated in this paper. As shown, the acoustic performances of the theatre are globally improved and contribute to excellent perception of the acoustic environment.
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

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

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

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

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

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

Mathematical 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

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

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

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

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

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

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

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

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

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

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

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

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

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).
A study of virtual learning environments (VLEs) adoption: an information system approach
Authors: Winarto  , Jamaluddin  , Nadapdap K M N , Gultom R , Pardede A M H
Published: December 2019

The study aims to examine students’ adoption towards a Virtual Learning Environment (VLE). Using the Technology Acceptance Model (TAM) as the theoretical framework, the study mainly focuses on the degree that perceived usefulness, and perceive ease of use has influence on students’ adoption towards Easy Class as the Virtual Learning Environment. The research used a quantitative approach. A questionnaire has been employed as an instrument to gather data from 2 classes in a private university in North Sumatera. The research found that perceived usefulness and perceived ease of use have a significant effect on the students’ adoption. At the end of the paper, the implications as well as the suggestion for future study are explained.
Analysis of Sigmoid Function Method And Histogram Equalization for Enhancement Contrast Image
Authors: Azmi Fadhillah , Harahap Mawaddah
Published: December 2019

Image Is one file that is able to provide information graphically to humans. However, not all images have a brightness level that suits the user, thus reducing the information obtained. To overcome this, it is necessary to increase contrast. The results of the tests show that the Histogram Equalization algorithm has an execution time of 83,109 ms, when compared to the time of the ACEBSF method which is 121.315ms. Whereas for the SSE value that is owned by the ACEBSF method is 14.619.460.211 greater than the SSE Histogram Equalization, which is 12.526.602.683. However, both methods have disadvantages if the K1 and K2 values are too small, the image quality improvement will fail.
Implementation of Augmented Reality of Android Based Animal Recognition using Marker Based Tracking Methods
Authors: Haryanto Edy Victor , Lubis Ervianna Lestari , Saleh Alfa , Fujiati  , Lubis Nurul Izzah
Published: December 2019

Augmented Reality (AR) is a technology that combines 2 dimensions with 3 dimensions in realtime. Augmented reality can be applied in various things, one of them is in the field of education. In the world of augmented reality technology education can be used as a means of introduction of aquatic animals. Augmented reality serves to display 3-dimensional objects and their information by scanning markers. Markers made as scanning objects are carried out by the smartphone camera and will display objects in 3 dimensions. Based on testing the distance measurement of the camera against the marker, the optimal distance obtained from the camera can read the marker at a distance of 8 - 77 cm. This augmented reality application has been running well on smartphones and has featured 3-dimensional objects along with its information. Applications that have been made to facilitate the introduction of aquatic animals.
Smart Home Security Design Applying One Time PAD Algorithm
Authors: Gunawan G , Lubis A R , Soeharwinto  , Mubarakah Naemah , Jollyta Deny , Effendi Syahril
Published: December 2019

Smart Home Security is a smart system for securing a house or building equipped with a security system applying the One Time Pad (OTP) algorithm. The background of this research is that the system that has been used recently do not use an adequate security algorithm so that it can still be broken by criminals or irresponsible parties. The system designed is intended to reduce or minimize home burglary against the part of the system applied in certain homes or rooms. Due to the imitation of passwords that are always the same or static, they are inputted when performing active or didactive security systems. Besides, to increase the level of security in the security section because of the application of the OTP (One Time Pad) method. The stages of the method are to implement the OTP algorithm and test its reliability and implement it on smart home security.
A Concept of Learning Design Of PID Control System Based On Matlab
Authors: Abubar Abdul Rahman , Hutabarat Libert Tommy , Peter Rossi
Published: December 2019

Learning the PID control system in the Control System courses in universities is mostly still using trial and error analysis methods with manual calculations. This kind of learning method has a weakness that requires a long time and has a high level of difficulty. To further enhance students’ understanding in the material of the control system, computer-aided learning media can be used. Matlab is one software that is very helpful for students’ understanding in learning to see responses of various combinations of parameters with different input variations. From the results of classroom action research, there were significant results in improving students’ understanding in the control system course, especially the PID control action material.
A Design of Analysis Influence of Channel Flow Instability Against Andongan On SUTT 150 Kv
Authors: Panjaitan Albert , Usman  , Suherman Benny
Published: December 2019

A Transmission lines airgenerally use ACSR type conductors. Increased demand for electrical energy, the effort to increase the transmission line capacity is done by optimizing the current carrying capacity of the existing transmission line, but the problem that arises in this optimization is the increase in voltage and the portion of the conductor. This study aims to determine the effect of channel flow instability on the conductor temperature, the conductor section, andongan angle and conductor voltage, which is then useful for the construction of the transmission line construction structure in accordance with the mechanical properties of the conductor used. The calculation in this study uses the heat balance equation to calculate the conductor temperature. The Basic Span Length method is used to determine the equivalent span length.
Enhanced of Speed Monitoring Brushless DC (BLDC) Equipment and Controller Based on Arduino
Authors: Aryza Solly , Lubis Zulkarnain , eh kan Phak len , khairunizam Wan , Hamdani
Published: December 2019

Because the BLDC motor (Brushless Motor Direct current) does not have a brush, it sounds noisy, and maintenance is more comfortable and has a higher efficiency than induction motors. The design of monitoring and motor speed controller starts with a 5 volt DC voltage from the power supply used to supply the Arduino Pro mini. In the Arduino Pro mini potentiometer as the input circuit to accelerate or slow down the motor rotation, then Arduino will control the BLDC motor through the driver circuit. When the BLDC motor runs the speed sensor circuit will read the speed of the BLDC motor is then by Arduino will be displayed to the LCD. From the test performed can be seen form PWM (Pulse Width Modulation) it and can set the form of PWM by changing the voltage using a potentiometer in the circuit.
Implementation of Tahani Fuzzy Logic Method for Selection of Optimal Tourism Site
Authors: Hadikurniawati Wiwien , Winarno Edy , Prabowo Arif Budi , Abdullah Dahlan
Published: December 2019

Indonesia has a variety of tourism industries. Travel makes people’s interest increase in visiting tourist sites. A recommendation application in the field of tourism is needed for the selection of the right tourism object was to be implemented in Central Java. This application is expected to provide information on prospective tourists in choosing tourist attractions effectively. This application can facilitate prospective tourists to choose tourist objects that match the criteria by applying the fuzzy tahani method. Fuzzy Tahani describe a fuzzy query processing method, based on language manipulation known as SQL (Structured Query Language). The Fuzzy Tahani model is very appropriate to be used in the process of finding the right and accurate data. Variables used in this application are variable ticket prices, number of facilities, number of visitors, distance traveled and types of tourist attractions.
Drug Users Prediction Using Backpropagation EducationalMethod
Authors: Abdullah Dahlan , Pardede A M H , Umami Liza , Manurung RosidaTiurma , Suryani Rini , Surya Sara , Saddhono Kundharu , Mulyaningsih Indrya , Sudarsana I Ketut , Brata DiahPujiNali , Mahatmaharti Rr Agung Kesna , Novziransyah Nanda , Amalia Ainna , Effendi SantosoUjang , Samidah Ida , Murwati M
Published: December 2019

The Artificial Neural Network in this study has been used to predict drug users by using the backpropagation method with the Matlab 7.7 software program. The variables consist of the number of drug users, the type of drug used and the employment status of drug users. The data input from 2010 to 2012 while the target data is 2013 data consequenlty if input data and target data are processed on artificial neural networks will produce output that can predicts 2014 drug users. Predictions actually consider the value which has not been seen in the future based on past data. Prediction is the process of predicting something by correcting the previous action. To predict a condition, it requires proper calculation to answer the problem. The calculation can use artificial neural networks with the backpropagation method.
Data Mining to Determine Correlation of Purchasing Cosmetics With A priori Method
Authors: Abdullah Dahlan , Pardede A M H , Cahayati Eli , Iskandar Akbar , Sari Ayu Esteka , Arifin Muhammad , Sari HerlinaLatipa , Nuryana Ida , Siregar Nurintan Asyiah , Surya Sara , Apituley Lilian G F , Wuryani Eni , Kuraesin Arlis Dewi , Erliana Cut Ita , Setiyadi Didik
Published: December 2019

Data mining is the process of analyzing data using software to find patterns and rules in the data set. Data mining can analyze large data to find knowledge to support decision making. In this study the Rule Association will be discussed as one of the data mining functions implemented using the A priori Algorithm. There will also be analyzed two support calculation techniques in candidate generation in the A priori Algorithm, such as: K-way and 2 Group-By in three sample datasets with transaction attributes id and item. In this study the problem of support calculation in candidate generation is the bottleneck of the A priori Algorithm where the improvement of the A priori Algorithm was emphasized on the candidate generation and the effectiveness of the A priori Algorithm. This research was lead on the Oracle RDBMS by utilizing WEKA tools to determine maximum support and confidence and to find out the correlation between products. The results shows the highest confidence value at 93% if you buy DeepClensingMilk and DeepClensingToner then you will buy Whitening Soap with confidence = 93%.