bluuebunny/crossref_metadata_2025_split huggingface dataset:
A rapid in vitro protocol for callus production in Piper aduncum L. propagation of East Kalimantan supplemented with gradient sucrose solutions
Authors: Kusuma R , Sudrajat  , Kartika R 
Published: August 2019

Abstract

Piper aduncum L. is a medicinal plant which contains important active compounds such as phenyl propanoids, lignoids and flavonoids. Furthermore, it is one of larvicidal agent against mosquitoes Aedes aegypti L. Alternative use of in vitro callus P. aduncum L. are as a substitute for medicinal raw materials and becomes one way to maintain the sustainability of germ plasm utility, which is related to its difficulties in conventional cultivation. An experiment based on saline formulation of Murashige and Skoog (MS) and Wood Plant Medium (WPM) combined with different 2,4-D and kinetin concentration was evaluated. Several conditions without plant growth regulator hormones with nodule segment explants produced good multiplication process. Inoculated micro-cutting segments of nodules were grown in media with an additional 2 mg/L of 2,4-D, 2 mg/L of kinetin and 30 g sugar produced multiplication of clear shoots and callus formation and were developed after 4 weeks of planting. Additional treatment of 60, 90, 120 g sugar showed slow growth as indicated by callus formation after 6-8 weeks of planting. Treatment of 30 g sugar showed better growth than other treatments, which triggered the survival of callus growth until 12 weeks after planting. The other treatments showed cell death after callus initiation due to browning process.
Utilization of ginger extract (Zingiber Officinale) and turmeric extract (Curcuma longa) as edible tomato-packing film
Authors: Sedyadi E , Sulistyowati A , Kusumawati M , Nugraha I , Prabawati S Y 
Published: August 2019

Abstract
Research on ginger extract and turmeric extract as edible tomato-packing film has been done. This study was conducted to determine the ability of both extracts in increasing the storage time of tomatoes tested by its texture and shrinkage of tomato fruit weight parameters. Research showed that the addition of ginger extract and turmeric extract into edible film able to maintain the quality and life of tomato fruit when reviewed based on 50% of shrinkage weight and 63% of texture damage. Fifty percent of shrinkage of tomato control weight occured within 45 days. Depreciation of 50% of tomato weight with edible film coating without ginger extract may increase to 48 days. Edible tomato coated with added ginger extract shrink 50% of tomato weight in 65 days, while tomato coated edible film with addition of turmeric extract experience 50% shrinkage of tomato weight in 60 days. Texture reduction of 63% in tomatoes occurred 7 days to 7.5 days with edible film coating without ginger extract, while with edible film coating with the addition of ginger extract to 12 days. While turmeric extract to 186 days.
Computational study of carbon nanotube-substituted boron-nitrogen for hydrogen storage with density functional theory method (DFT)
Authors: Anwar K , Gunawan R , N Subagyono R R D J 
Published: August 2019

Abstract
Computational study of pure carbon nanotube, carbon nanotubes and carbon nanotube substituted boron boron-nitrogen substituted as hydrogen storage has been done. This research was conducted using the method Density functional theory (DFT), B3LYP functional and basis set STO-3G. Substitution of boron and nitrogen atoms produce structures with lower total energy, while the boron atom substitution produces structures with higher total energy than the pure carbon nanotubes. Lowest total energy possessed by a carbon nanotube boron-nitrogen substituted by -1321 10−14 J, while nanotube pure carbon structure of -1.319 10−14 J and boron-substituted carbon nanotube of -1.314 10−14 J. The total value of lowest energy is obtained from 105 structure with the addition of molecular hydrogen.
Modelling using unified software development process (USDP) method for repository system in Mulawarman University
Authors: Hatta H R , Khairina D M , Haviluddin  , Kridalaksana A H , Maharani S , Ramadiani  , Kresnapati B 
Published: August 2019

Abstract
Lack of academic document storage or academic electronic-based data in Mulawarman University is the basis of this research. As a Republic Indonesia Regulation in No. 82/2012 on Electronic System and Transaction Act. 3. Therefore, Mulawarman University is required to provide electronic document or electronic-based data storage thus easy for those who need it. In this study, Unified Software Development Process (USDP) methodology as a modeling system has been implemented. Meanwhile, PHP and MySQL as a system development tool have been explored. A document storage system or website-based data called a repository information system has been created as a result of this research. Furthermore, this repository has ten types documents that can be stored and retrieved, consisting of journals, books, proceedings, articles, university regulatory, guidance, reports, course materials, letters, and other academic data for Mulawarman University.
Implementation of Wireless Sensor Network (WSN) to calculate air pollution index of Samarinda City
Authors: Rinaldi A , Natalisanto A I , Muliyono S , Said S 
Published: August 2019

Abstract
Environmental pollution is one of the major problems opened by the world today. The main problem of this pollution, is decreasing air quality. This decrease in air quality is caused by many things, from excessive environmental exploitations, industrial activity, energy use, until the exhaust emissions of vehicles all of which trigger into pollution problems. So far Indonesian government has purchased and use the Air Quality Monitoring Base Station to measure different types of air pollutants. However, field statistics data show that the minimum quality of air quality measuring devices in each city is not commensurate with the minimum recommended amount, ideally one base station is used for 200.000 inhabitans. In this research, we developed an integrated Wireless Sensor Network to monitor the concentration of air pollution. Implemented fifteen sensor nodes which each node contains CO and NO2 sensors to sensing from the environment. the collected data will be used to calculate the standard air pollution index of samarinda city. The data is stored in server and we can publish for public to access information throught a gadget and thing speak server.
Graph coloring for determining angklung distribution
Authors: Salindeho B M , Baskoro E T 
Published: August 2019

Abstract
Angklung is a traditional instrument originated from West Java, Indonesia. It is played by shaking it and each angklung can only produce one note. A set of angklungs are needed in order to produce a whole song. An angklung player can hold no more than seven angklungs because of the size of the instrument. A player also cannot hold two overlapping angklungs since shaking more than one angklung at the same time is nearly impossible. These restrictions create problems that can be modeled as mathematical problem. It is called the angklung distribution problem, which is the problem of distributing angklungs to each player based on a given song so that no player holds two or more overlapping angklungs with the least possible number of players. In this paper, we model this problem into a graph theoretical problem where we use the concept of graph coloring to solve this problem. We also develop a method to lower the number of players suggested from the graph coloring by viewing the song as an array of symbols.
Composition of Indonesia throughflow in North Sulawesi water masses and heat content
Authors: Bernawis Lamona I , Ramadhan Fauzan L , Chairuasni Luqman N , Rachmayani Rima , Putri Mutiara R 
Published: August 2019

Abstract
In this research the composition of water masses in the North Sulawesi (Sangihe Talaud) waters as part of the Indonesian Throughflow is investigated and analysed by using the Optimum Multi Parameter Analysis (OMP). The data used is the World Ocean Atlas data (WOA 13) in 1° x 1° latitude longitude resolution. Main data are the salinity, temperature and pressure. The Optimum Multiparameter analysis was used to calculate the percentage of each water mass contribution in the study waters. The contributions are 20-60% at 200-500 m depth for The North Pacific Intermediate Water (NPIW), 90-100%at around 0-100 meters depth for The North Pacific Subtropical Water (NPSW),100%at 900-1500 meters depth for the South Pacific Intermediate Water (SPIW)and 80-100% at 1100-1500 meters depth for TheAntartic Intermediate Water (AAIW). Surprisingly, the South Pacific Subtropical Water (SPSW) does not have any contribution and largest heat content comes from the AAIW. Magnitudes for each heat content of water types calculated in this study for NPIW, NPSW, AAIW, SPSW, and SPIW are in the range of 1.5 × 1014∼ 1.7 × 1014 J/m2, 2 × 1012∼ 9.9 × 1012 J/m2, 2.7 × 1014∼ 3.1 × 1014 J/m2, 0 ∼ 4.3 × 1011 J/m2, and 1.8 × 1014∼ 2 × 1014 J/m2, respectively. Eventhough the AAIW has the lowest temperature range but its large contribution in the waters outnumbers the warmer water masses.
Semiparametric regression based on three forms of trigonometric function in fourier series estimator
Authors: Mardianto M F F , Tjahjono E , Rifada M 
Published: August 2019

Abstract
The semiparametric regression is one of the three forms of regression analysis which is made up of parametric and nonparametric. While the parametric is based on linear estimator, this nonparametric component is an innovation. This research proposes all the possible trigonometric basis usually used in Fourier series as nonparametric component estimator, its advantage, which includes its ability to overcome data with oscillation patterns. This study discusses nonparametric regression based on complete and sine Fourier series. Both estimators are developed using the cosine Fourier series concept. The outputs are two estimators which are used for parametric and nonparametric components with the corresponding form in semiparametric regression. In addition, all of these can be applied in real problems, and the best estimator is determined based on the smallest GCV and MSE for an oscillation parameter which gives the highest coefficient of determination for the selected one.
A flipped-classroom pilot in a spectroscopy course for undergraduates
Authors: Montalbano V , Marinelli C 
Published: August 2019

Abstract
In order to promote problem-based and active learning in the physics laboratory, we designed a flipped classroom focused on the Franck-Hertz experiment. The flipped classroom approach moves course content from the classroom to homework and uses class time for engaging activities and problem solving. This constructivist approach to teaching is an effective means of student-centred collaboration and it can promote active learning, enhance the critical thinking and obtain the maximum use of student-faculty time together. We report preliminary results of the flipped classroom approach to a laboratory and how it worked in the context of a small group of students in a physics course.
Teaching General Relativity with sector models: the field equations
Authors: Kraus U , Zahn C 
Published: August 2019

Abstract
The field equations of the general theory of relativity state the connection between spacetime curvature and matter, often summarized as “matter curves spacetime”. In this contribution we analyze the structure of the field equations from a pedagogical point of view and describe a formulation that is accessible in secondary school and undergraduate physics. This formulation of the field equations requires the concept of curvature in three dimensions and we show how this notion can be introduced using sector models. The field equations are illustrated using the black hole as an example.
Visualization of chaotic attractors in 3D as motivating tool for introductory physics course
Authors: Nagy P , Tasnádi P 
Published: August 2019

Abstract
It is well known that simple nonlinear systems can produce inherently unpredictable behaviour, which is called chaotic motion. Interest in the theory behind it has risen rapidly and much effort has been invested in integrating it into graduate and undergraduate curricula. However, the concepts and ideas that are appropriate for the description of these motions are very abstract and intricate. Human beings are visual creatures in nature; therefore all aids and procedures which give a visible demonstration of an abstract idea are of great value from a didactic point of view. Our paper offers the teachers a method for the demonstration of strange attractors which play a central role in the theory of chaotic systems. The images of the 2D projection of the strange attractors are well known and common, however their 3D visualisation gives a real sensation for the human brain so they are much more suitable for capturing the students’ interest. With the help of our downloadable MAPLE program the DXF files of strange attractors can be easily generated and their images can be engraved in glass. E-materials belonging to the method can be downloaded from our webpage.
Experimental problem solving: a plausible approach for conventional laboratory courses
Authors: Khaparde R 
Published: August 2019

Abstract
Almost every student is expected to work on a collection of experimental setups to get the desired ‘hands-on’ experience with physical systems during the conventional laboratory courses offered at colleges and universities the world over. In a number of conventional laboratory courses, the ‘minds on’ aspects and related cognitive abilities are not given their due importance, probably for a variety of valid reasons and constraints. This affects the overall learning and development of various capabilities that seems to be achievable through laboratory courses. As a plausible alternative to the traditional method of instruction, ‘experimental problem solving’ approach developed and implemented for the physics laboratory courses by the author is presented here. In this approach, students are given ‘experimental problems’ and encouraged to think and decide on several aspects and thereby perform self-guided experimental work with minimal help from the instructor. For this, each conventional experiment is presented as an experimental problem. The experimental problem solving approach thus integrates and fosters conceptual understanding, procedural understanding, experimental skills, cognitive processes, and overall problem solving ability. In this paper, the author presents details of the experimental problem solving approach and illustrates the approach with two sample experimental problems.
Interactive animations as a tool in teaching general relativity to upper secondary school students
Authors: Ryston M 
Published: August 2019

Abstract
One possible and often seen approach to teaching General Relativity are the so-called embedding diagrams. Educators are using them, sometimes perhaps even unknowingly, any time they talk about spacetime around a star being “like a rubber sheet weighed down by a bowling ball”. In this contribution we will briefly remind what these embedding diagrams are and discuss possible problems with their use. Finally, we will introduce interactive computer animations (applets) as a possible approach to overcome some of these problems.
Understanding physical phenomena through simulation exercises
Authors: Saastamoinen K , Rissanen A 
Published: August 2019

Abstract
Traditional lectures and exercises are good for gaining basic knowledge in STEM (Science, Technology, Engineering and Mathematics). If feasible, motivational and deeper learning experiences like laboratory - or work life-related field experimentation are included in studying levels, more concrete learning experiences can be reached. At the National Defence University (NDU), the theoretical part of master’s level studies in STEM relies on earlier basic studies. In order to promote practical skills, a specific simulation and modelling course is aimed at learning how real-world artifacts or models work, how to acquire data, how to visualise the acquired data, and to develop one’s understanding trough simulations. This course ends with a group work, where participating students are asked to produce a working simulation model either from the given list or from their professional context. This study describes two sample cases: The first one is a flight simulator that includes a lot of physics and physical phenomena. The second one illustrates time dependence and statistical nature of targeting. The course’s success is estimated from reports and the feedback given by the students. Observations on motivation and learning goals are included. For military officers learning is practically oriented, while in natural sciences learning is theoretically oriented. In both cases simulation is a natural “bridge” in between theory and practice.
Teaching and learning introductory electrostatics - conformity with nomenclature conventions
Authors: O’Sullivan C 
Published: August 2019

Abstract
The treatment of electric flux in most textbooks on introductory physics, at least in the English language, differs radically from the definitions prescribed by the statutory and intergovernmental organizations (CGPM, BIPM, IUPAP, IUPAC, NIST, etc). The approach also conflicts with the treatment of the topic in many electrical engineering texts. Furthermore, it is at variance with the standard treatment of matter elsewhere in the curriculum (e.g., mechanical or thermal properties). Historical reasons for this discrepancy are investigated and it is suggested that resolving this conflict would be beneficial to the teaching and learning of this and related topics.
Ferrofluids in secondary schools through an interactive stand
Authors: Caroaie O V , Caltun O F 
Published: August 2019

Abstract
A central theme of the discussion about education in Europe is linked to improving the quality and relevance of skills and competences that educational system beneficiaries form during their training. To perform a proper and coherent analysis on the introduction of informations about ferrofluids in the national curriculum a sociological study was conducted in several schools in the city Bârlad, Romania. Through an interactive exhibition stand, pupils were able to maneuver a ferrofluid with a magnet. The stand was arranged such as to allow easy access for handling the ferrofluid and for reading the informations displayed on its walls.
Sources of motivation of high school students for participation in physics competitions
Authors: Kolář K 
Published: August 2019

Abstract
This article studies motives on why high school students participate in physics competitions in the form of a case study (with qualitative and quantitative elements) focused on one contest. We bring a brief insight into primary motivations for their participation and how it is changing later. The pinpoint of our study is that it is hard to address new participants these days. Their most often motivation for starting in the competition is to get better in physics, general interest in physics and interest in solving challenging tasks. For those who continue in participation – they usually want to get even better in physics. That’s because participants often realise that they are not as good as they thought. A motivation which is getting stronger is also to get an invitation to an educational camp. We also briefly discuss possible demotivational factors.
Understanding acceleration: An interplay between different mathematics and physics representations
Authors: Pendrill A-M 
Published: August 2019

Abstract
Acceleration is often viewed as abstract – but when a person accelerates, e.g. in a car or on swings, trampolines, carousels or rollercoasters, the force required for the acceleration is felt throughout the body. If acceleration is introduced as force divided by mass rather than as a second derivative of displacement, the concept can be made accessible to much younger learners, such as 10-year olds taking part in supervised visits to an amusement park or playground. The force required for acceleration can be measured e.g. using smartphone sensors. The forces can also be illustrated in demonstrations that complement photos and video analysis. For a teacher this creates opportunities to discuss challenging concepts of force and motion, in enjoyable authentic situations.
Research and Development of Distribution Automation Terminal Based on IEC61850
Authors: Zhang Peng , Xu Peng , Wang Yize , Wang Wei 
Published: August 2019

Abstract
Distribution automation system is an important means to improve the reliability and quality of power supply, expand power supply capacity, and realize efficient and economic operation of distribution network. However, the existing problems are: low online rate of distribution terminal, low data utilization rate, low success rate of remote control of distribution automation system, and great difficulty in operation and maintenance. This paper studies and develops a hardware development platform of distribution terminal based on high-speed bus interaction technology of distribution terminal. The software development platform based on IEC61850 information model and modeling technology can improve the level of distribution automation and application effect.
Modeling and Diagnosis of Joints in High Voltage Electrical Transmission Lines
Authors: Bindi M. , Grasso F. , Luchetta A. , Manetti S. , Piccirilli M.C. 
Published: August 2019

Abstract
In this paper a new method is developed and described, aimed at the modeling and diagnosis of the joints connecting the ends of two cables on a high voltage electricity pylon. Identifying the anomalous joint behaviour through the line frequency response analysis is the first objective of the work. For this reason, it is necessary to model the whole overhead line with a lumped circuit and studying the joint electrical parameter variation. The problem is approached in multiple steps: modelling, testability analysis of the model, optimal frequency selection, identification of the possible failures. Some simulated cases are included in order to show the potentialities of the method.
A Calculation Model for Typical Data Center Cooling System
Authors: Huang Jianwen , Chen Cheng , Guo Guiyang , Zhang Zhang , Li Zhen 
Published: August 2019

Abstract
This paper has established a typical calculation model for typical data center cooling system, including the inside room CRAC system, outside free cooling usage system and chiller. The aim of establishing such method is to calculate the power consumption of the data center and to guide the work of energy conservation. The results show that, higher inside room temperature, lower water mass flow rate and lower outside air temperature lead to lower PUE.
Optimization of Drilling Parameters with Aid of Real Time Data for Buzargan Oil Field
Authors: Hazem Hassan Khalid , Abdul Hussien Hassan A. H. 
Published: August 2019

Abstract
This paper showed how real-time data that obtained during drilling operation can be used for optimizing drilling parameter such as weight on bit (WOB), and rotary speed (RPM) in term of drilling cost per foot. The real-time data that obtained from mud logging unit included the rate of penetration (ROP), WOB, RPM, depth …. etc.
In this work, the real-time data obtained from Buzurgan oil well (BU-50) were used for drilling optimization. Rock strength for each drilling foot of section obtained from a sonic log, using SPSS (Statistics) software to calculate it correction factors a,b, and c for Mishrif formation and apply nonlinear regression method after that make drill behind for validation purpose. Finally, the optimal drilling parameters were estimated with the cost model.
Based on the results obtained, a good agreement achieved between results of rate of penetration that obtained from drilling model and actual penetration rate along the drilling section. Also, cost analysis shows that the optimal weight on bit and rotary speed for drilling that section are 18 klb and 116 rpm respectively which achieves a minimum cost per foot.