bluuebunny/crossref_metadata_2025 huggingface dataset:
Combining machine learning with knowledge-based modeling for scalable forecasting and subgrid-scale closure of large, complex, spatiotemporal systems
Authors: Wikner Alexander , Pathak Jaideep , Hunt Brian , Girvan Michelle , Arcomano Troy , Szunyogh Istvan , Pomerance Andrew , Ott Edward
Published: May 2020

We consider the commonly encountered situation (e.g., in weather forecast) where the goal is to predict the time evolution of a large, spatiotemporally chaotic dynamical system when we have access to both time series data of previous system states and an imperfect model of the full system dynamics. Specifically, we attempt to utilize machine learning as the essential tool for integrating the use of past data into predictions. In order to facilitate scalability to the common scenario of interest where the spatiotemporally chaotic system is very large and complex, we propose combining two approaches: (i) a parallel machine learning prediction scheme and (ii) a hybrid technique for a composite prediction system composed of a knowledge-based component and a machine learning-based component. We demonstrate that not only can this method combining (i) and (ii) be scaled to give excellent performance for very large systems but also that the length of time series data needed to train our multiple, parallel machine learning components is dramatically less than that necessary without parallelization. Furthermore, considering cases where computational realization of the knowledge-based component does not resolve subgrid-scale processes, our scheme is able to use training data to incorporate the effect of the unresolved short-scale dynamics upon the resolved longer-scale dynamics (subgrid-scale closure).
Schur–Weyl quasi-duality and (co)triangular Hopf quasigroups
Authors: Shi Guodong , Wang Shuanhong
Published: May 2020

Schur–Weyl duality relates the representation theories of general linear and symmetric groups in defining characteristic and plays a central role in many parts of algebraic Lie theory. In this paper, we will introduce the notion of Schur–Weyl quasi-duality and study it. For this, generally, we consider a braided vector space (V,c) and its braided Lie algebra Endk(V)(−). Then, we can construct its braided enveloping algebra U(Endk(V)(−)), which is a connected braided c-cocommutative Hopf algebra. Let H be a triangular Hopf quasigroup with bijective antipode and B be a cotriangular Hopf quasigroup with bijective antipode. Let V be any finite dimensional vector space in the category LQ(H,R)(B,σ) of generalized Long quasimodules. We show that (U((EndkV)(−))⋆H⋆B,kSn,V⊗n) is a Schur–Weyl quasi-duality under suitable conditions.
Acclimation strategy and plasticity of different soybean genotypes in intercropping
Authors: Hussain Sajad , Pang Ting , Iqbal Nasir , Shafiq Iram , Skalicky Milan , Brestic Marian , Safdar Muhammad E. , Mumtaz Maryam , Ahmad Aftab , Asghar Muhammad A. , Raza Ali , Allakhverdiev Suleyman I. , Wang Yi , Wang Xiao C. , Yang Feng , Yong Taiwen , Liu Weiguo , Yang Wenyu
Published: May 2020

In response to shading, plant leaves acclimate through a range of morphological, physiological and biochemical changes. Plants produce a myriad of structurally and functionally diverse metabolites that play many important roles in plant response to continually changing environmental conditions as well as abiotic and biotic stresses. To develop a clearer understanding of the effects of shade on soybeans at different growth stages, a comprehensive, three-year, stage-wise study was conducted. Leaf area, leaf thickness, stem diameter, chlorophyll contents, photosynthetic characteristics and other morphological and physiological features were measured along with biochemical assays for antioxidants such as superoxide dismutase, peroxidase and caralase and yield attributes of different soybean genotypes (Guixia 2, Nandou12, Nandong Kang-22, E61 and C103) under shading nets with 50% light transmittance. It was observed that early shading (VER1 and VER2) significantly decreased main stem length and main stem length/stem diameter. Later shading (R1R8 and R2R8) had significant effects on morphological characters such as branch number and pod height. In Nandou 12, the protein contents in plants shaded at R1R8, R2R8 and R5R8 were 9.20, 8.98 and 6.23% higher than in plants grown under normal light levels (CK), respectively, and the crude fat content was 9.31, 10.74 and 4.28% lower. The influence of shading in the later period on anatomy was greater than that in the earlier period. Shading reduced the light saturation point (LSP), the light compensation point (LCP) and the maximum photosynthetic rate (Pnmax), and increased the apparent quantum yield (AQ). Shading also increased the antioxidant enzyme activity in the plants, and this increase was greater with early shading than late. The variability in the chlorophyll (a + b) content and the chlorophyll a/b ratio in R2 stage plants was less than in R5 stage (VER5) plants. Similarly, the activity of antioxidant enzymes in R2 after returning the plants to normal light levels (VER2) was lower than in R5 after relighting (VER5). Compared with later shading, the early shading had a greater effect on the photosynthetic and related characteristics. The longer the shading time, the greater the adverse effects and the less able the plants’ were to recover. The data collected in this study contribute to an understanding of the physiological mechanisms underlying the early and late growth stage acclimation strategies in different soybean genotypes subjected to shade stress.
The agreement of existentialhaberin three varieties of spoken Spanish
Authors: Gómez Devís M.ª Begoña , Gómez Molina José Ramón
Published: May 2020

This paper aims to present one of the most relevant linguistic phenomena of spoken Spanish on both sides of the Atlantic. The singular/plural forms of the verbhaberwith existential meaning have received considerable attention due to the fact that it is a linguistic variable that changes according to the variety of Spanish that is used. We report the findings from the research carried out within three speech communities: Valencia, Las Palmas and Mexico City, analysing the internal and external factors that may explain this linguistic variation. For this study we have selected these communities because all the data have been obtained according to the guidelines proposed in the PRESEEA (Project for the Sociolinguistic Study of Spanish from Spain and from America). The results are the product of rigorous statistical analysis and allow us to illustrate the processes of convergence or divergence.
Quadruple-stacked Nb/NbxSi1 – x/Nb Josephson junctions for large-scale array application*
Authors: Cao Wenhui , Li Jinjin , Wang Lanruo , Zhong Yuan , Zhong Qing
Published: May 2020

Large-scale Josephson junction (JJ) arrays are essential in many applications, especially quantum voltage standards application for which hundreds of thousands of junctions are required to realize a high quantum voltage. For almost all applications, high-quality JJ arrays must be realized in a small chip area. This study proposes vertically quadruple-stacked Nb/(Nb
x
Si1 – x
/Nb)4 JJs to increase the integration density of junctions in an array. The current–voltage (I–V) characteristics of a single stack of Nb/(Nb
x
Si1 – x
/Nb)4 JJs have been measured at 4.2 K. The uniformity of junctions in one stack and the uniformity of several stacks over the entire 2 inches wafer have been analyzed. By optimizing the fabrication parameters, a large-scale quadruple-stacked Nb/(Nb
x
Si1 – x
/Nb)4 array consisting of 400000 junctions is realized. Good DC I–V characteristics are obtained, indicating the good uniformity of the large-scale array.
Spin waves and transverse domain walls driven by spin waves: Role of damping*
Authors: Zhao Zi-Xiang , He Peng-Bin , Cai Meng-Qiu , Li Zai-Dong
Published: May 2020

Based on the uniform, helical and spiral domain-wall magnetic configurations, the excited spin waves are studied with emphasis on the role of damping. We find that the damping closes the gap of dispersion, and greatly influences the dispersion in the long-wave region for the spin waves of spiral wall and helical structure. For the uniform configuration, the Dzyaloshinskii–Moriya interaction determines the modification of dispersion by the damping. Furthermore, we investigate the interaction between spin waves and a moving spiral domain wall. In the presence of damping, the amplitude of spin wave can increase after running across the wall for small wave numbers. Driving by the spin waves, the wall propagates towards the spin-wave source with an increasing velocity. Unlike the case without damping, the relation between the wall velocity and the spin-wave frequency depends on the position of wall.
Regulation mechanism of catalyst structure on diamond crystal morphology under HPHT process*
Authors: Li Ya-Dong , Cheng Yong-Shan , Su Meng-Jie , Ran Qi-Fu , Wang Chun-Xiao , Ma Hong-An , Fang Chao , Chen Liang-Chao
Published: May 2020

To elucidate the regulation mechanism of catalyst geometry structure to diamond growth, we establish three catalyst modes with different structures. The simulation results show that with the decrease of the protruding height of the catalyst, the low-temperature region gradually moves toward the center of the catalyst, which causes the distribution characteristics of the temperature and convection field in the catalyst to change. The temperature difference in vertical direction of the catalyst decreases gradually and increases in the horizontal direction, while the catalyst convection velocity has the same variation regularity in the corresponding directions. The variation of temperature difference and convection velocity lead the crystal growth rate in different crystal orientations to change, which directly affects the crystal morphology of the synthetic diamond. The simulation results are consistent with the experimental results, which shows the correctness of the theoretical rational analysis. This work is expected to be able to facilitate the understanding of catalyst structure regulation mechanism on diamond morphology and the providing of an important theoretical basis for the controllable growth of special crystal shape diamond under HPHT process.
Construction of monolayer IrTe2 and the structural transition under low temperatures*
Authors: Wang Aiwei , Liu Ziyuan , Pan Jinbo , Li Qiaochu , Li Geng , Huan Qing , Du Shixuan , Gao Hong-Jun
Published: May 2020

Bulk iridium ditelluride (IrTe2) is a layered material and is known for its interesting electronic and structural properties, such as large spin–orbit coupling, charge ordering, and superconductivity. However, so far there is no experimental study about the fabrication of monolayer IrTe2. Here we report the formation of IrTe2 monolayer on Ir(111) substrate by direct tellurization method. Scanning tunneling microscope (STM) images show the coexistence of 1/5 phase and 1/6 phase structures of IrTe2 at room temperature. We also obtained STM images showing distorted stripe feature under low temperatures. This stripe feature is possibly induced by the strain between the IrTe2 monolayer and the metal substrate. Density functional theory (DFT) calculations show that the IrTe2 monolayer has strong interaction with the underlying Ir(111) substrate.
Conceptual design progress of advanced fusion neutron source
Authors: Ochiai K. , Sato S. , Kondo H. , Ohta M. , Oyaidzu M. , Nakamura M.M. , Kwon S. , Tanigawa H. , Nozawa T. , Kasugai A. , Sakamoto K. , Ishida S.
Published: May 2020

Based on the results of the IFMIF/EVEDA project in the broader approach (BA) activities, the conceptual design of the Advanced Fusion Neutron Source (A-FNS) to obtain irradiation data of DEMO blanket materials is under consideration in Japan.

This paper describes the progress of the A-FNS conceptual design, which consists of a 40 MeV, 125 mA deuteron beam, a liquid lithium target system, and a test and post-irradiation test facilities. the main objectives of the A-FNS are the acquisition of RAFM irradiation data up to 2035 and the tritium recovery test on the blanket. In addition, it is expected to be used for various neutron researches.

The technical design activities of the A-FNS are focused on improvement of the lithium target design, review of impurity criteria, remote handling, and irradiation application plan.
Spectral properties of Lampyris Noctiluca firefly from Sumatra
Authors: Ratnawulan  , Pertiwi Endah , Septika Arma Erni , Ahda Yuni
Published: May 2020

One type of creeping firefly (Lampyris noctiluca) has been found in the forest area, West Sumatra, Indonesia. This study reports the spectral properties of these fireflies using a nanofotometer. From the measurement results, the wavelength value at maximum intensity is 580 nm. The decay constant, the number of photons, the quantum yield and the activation energy produced are 0.0092 / sec, 4.95 quanta / sec, 0.283 and 2.1433 eV, respectively.
Design of a simple and low cost electrical property tester for graphene material : a preliminary study
Authors: Hidayat Rahmat , Oktasendra Fandi
Published: May 2020

A simple and low cost electrical property tester for material has been designed and built using cheap components. This instrument consists of simple adjustable current source circuit using LM317, gold coated pin probe and multimeters. The circuit arranged has produced sufficient current to do an electrical property measurement. Value of current could be adjusted to select suitable current in measurement. Resistance vs current graph shows a reciprocal function that generated by a constant voltage of 1.25 volts in output pin. An experiment to examine sheet resistance of ITO glass was carried out to make sure the instrument work properly.
Scanning electron microscope (SEM) imaging and analysis of magnetic minerals of lake Diatas peatland section DD REP B 693
Authors: Aisyah Nur , Rifai Hamdi , Maisonneuve Caroline Bouvet De La , Oalmann Jeffrey , Forni Francesca , Eisele Steffen , Phua Marcus , Putra Rizaldi
Published: May 2020

Peatlands are formed from the accumulation of organic matter that originate from weathering vegetation for a long time. Minerals within peatlands can come from volcanic ash and consist of several types of minerals, one of which is magnetic minerals. This research aims to look the morphology, elemental composition and type of magnetic minerals found in the Lake Diatas peatland in Solok Regency, Indonesia because magnetic minerals have different morphologies depending on the source. The selected samples were from core DD REP B 693, which had a high magnetic susceptibility value. The magnetic minerals in the peatland were imaged and identified using Scanning Electron Microscope (SEM), which was equipped with Energy Dispersive Spectrometer (EDS). The results of morphological analysis showed that peatland had oval-shaped minerals with fractures and are multidomainal. The Back Scattered Electron (BSE) images show that the minerals have a bright colored surface that indicates the presence of a high amount of Fe. The EDS results showed that magnetic minerals from the peatland predominately contain the elements Fe, Ti, Si, and O. Based on the relative proportions of these elements, the magnetic minerals that can be formed in peatland are Magnetite (Fe304) and Ilminite (FeTiO3)
Using the Schlumberger configuration resistivity geoelectric method to estimate the rock structure at landslide zone in Malalak agam
Authors: Permana R S , Buana A P , Akmam A , Amir H , Putra A
Published: May 2020

Landslides that often occur in the Malalak sub-district are very detrimental to the community. Landslides in the Malalak sub-district have caused casualties and the closure of the Malalak road segment. According to studies that have been carried out factors that influence the occurrence of landslides are slope, skid field, rock structure and external factors such as rain and earthquake intensity. Rock structures of landslide-prone areas are urgently needed which will be used as reference data to predict potential landslides. This research aimed to estimate the structure of the rock as a reference or supporting data to determine the potential for landslides in the Malalak. The method used in this study is the Schlumberger configuration Resistivity Geoelectric Method. Based on the estimated structure of the rocks in the Malalak region, the rock types in the area consist of Clay, Sandstone, Limestone, Andesite, and Granite.
Analysis of the mentawai region fault field based on earthquake relocation data using the modified joint hypocenter determination (MJHD) method
Authors: Guci M , Syafriani S , Putri Y T
Published: May 2020

Tectonic conditions in an area are very important to know, one of them is the Mentawai region. Mentawai is an area prone to earthquake disasters, this is because the Mentawai is located between the subduction zone between the Eurasian Plate and the Indo-Australian Plate. One of the earthquake parameters that is needed in analyzing tectonic conditions is the hypocenter. Accurate hypocenter determination can be done by relocating earthquakes using the Modified Joint Hypocenter Determination (MJHD) method. The MJHD method is carried out by inversion of the main earthquake and aftershocks with correction of the station at the earthquake event. The earthquake data in this study began on September 1, 2017, until December 31, 2018, with 1 main earthquake and 104 aftershocks in the format of arrival time. The main earthquake before the relocation is at longitude coordinates 99.85o latitude -2.6o with a depth of 12 km. After being relocated it is at coordinates 99.5413o latitude 2.5779o with a depth of 29 km. The results after the relocation were identified were fault fields occurring in the B-B cross-section ‘nodal plane 2 with a strike of 141o 66o slip 92o. Earthquake relocation using the Modified Joint Hypocenter Determination (MJHD) shows a change in the Root Mean Square (RMS) value <1. This suggests that the earthquake hypocenter after relocation using the Modified Joint Hypocenter Determination (MJHD) method is more accurate.
Design of rotary photoreactor using nano Cu/TiO2 for degradation humic acid in outdoor visible light
Authors: Zilla R , Purnamasari D , Zainul R
Published: May 2020

Doping agents that can increase the activity of TiO2 photocatalys, namely copper (II) or Cu2+ ions because copper is one of the abundant transition metal elements on earth and has Cu2+ (0,68 Å) ion radius which is close to the radius Ti4+ that is (0,74 Å) so that it can be incorporated in TiO2 crystals. Coping is done using the sol-gel method. The Cu concentration used for drying was 5% and calcined at 4000C. the results obtained were then characterized by XRD and obtained by the structure namely anatase, then the crystals were used to degrade humic acid in external light and by using variations in rotation speed and length of time of irradiation. The best reduction in absorbance was found at a rotation speed of 1500 rpm, which was 69,18 % degraded humic acids.
An analysis of development of student’s worksheets with the theme integrated science energy in life by using integrated type of integrated learning in 21stcentury
Authors: Gusti Dian Arima , Ratnawulan
Published: May 2020

The curriculum 2013 (K-13) requires all subjects to contribute to the formation of attitudes, knowledge, and skills. One of the subjects in Junior High School that contributes to this is integrated science. The integrated science phenomenon is generally abstract, so science is a subject that is not easy to learn. Based on this phenomenon, a student worksheets integrated science is needed that can implement and integrate various concepts that have been found as expected in 21st century of learning. The 21st century of learning is learning that integrates literacy skills, knowledge skills, skills and attitudes and mastery of technology. The preliminary study is to conduct a material analysis to determine the needs of students in developing a student worksheets integrated science. Based on the analysis of the preliminary study, it can be concluded that the theme of energy in life using an integrated type of 21st century of learning to stimulate students to apply and integrate various concepts in 21st century of learning
Analysis of physics e-modules based on guided inquiry integrated with Quran knowledge
Authors: Dona Prisma , Syafriani S
Published: May 2020

The era of Industrial Revolution 4.0 is an era where human life is always related to technology, including in the field of education. Every teacher is required to be adept at using information technology in the implementation of learning. One example of the use of technology by teachers is the use of electronic teaching materials. In addition to the use of technology, teachers also associate learning material with the Qur’an. So that students can understand learning not only from physical theory, but also from Islamic studies. Therefore, it is necessary to analyze the teaching materials used by the teacher in conducting learning in school. This research is a descriptive research. The method used is in the form of interviews and questionnaires for physics subject teachers and students. The results of the study show that the teaching materials used are still in the form of printed textbooks that are sold on the market and printed modules prepared by the teacher. The modules compiled by the teacher have not yet used the learning model so that they have not been able to guide students to be able to learn independently from the module. The module also has not linked physics, material with the insights of the Qur’an. So it is necessary to develop a guided inquiry-based physics e-module integrated in the Qur’an
Media analysis in the development of e-module based guidance inquiry integrated with ethnoscience in learning physics at senior high school
Authors: Kurniawan R , Syafriani S
Published: May 2020

Today’s technology is developing very rapidly, marked by many latest sophisticated inventions in various fields, including in the educations sector. The application of technology in the education field is found by electronic-based learning media such as the E-module. However, the existing E-module has been not able to guide a student to find physics concepts and according to the needs and conditions of students. So, it’s necessary to develop a guided inquiry-based e-module integrated ethnoscience that fits with the needs and conditions of students. This research is descriptive qualitative research. The result of media analysis, guided inquiry-based E-module are needed that suitable the needs and conditions of students.
Preliminary analysis of student worksheets development with multi-representation approach on 21st century physics learning
Authors: Septiani T , Yulikifli  , Havid M
Published: May 2020

The practice of learning at schools supposed to be centered on the student, collaborative, contextual, and integrated with student’s lives in the community. Facts that occur in schools, students have not fully the center of the learning process. Physics learning has been associated with real-life but yet can be solving physics problems that vary in daily life. It causes a lack of competence of knowledge, attitudes, and skills of students in learning Physics. Therefore, the student’s worksheet that can help students in the learning process is needed. Student Worksheets with a multi-representation Approach can be used to help students on solving vary physics problems in daily life. The purpose of this study was to find out the preliminary analysis in the development of student worksheets with a multi-representation approach in 11th-grade physics subjects in the first semester. The preliminary analysis carried out in this study was the needs of analysis, student characteristics analysis, learning material analysis, and assignment analysis. Instruments used were questionnaire sheets and interview guideline sheets. The research method used is descriptive qualitative research with research samples who are students of SMA N 15 Padang and SMA N 9 Padang. This research has descriptive data as a result.
Preliminary analysis of learning resources for edupark physics in hydroponic cultivation of SMK N 2 Batusangkar, Indonesia
Authors: Sari A P , Rifai H
Published: May 2020

Environment based learning is a strategy in learning by utilizing the environment as a learning tool, learning resource, learning media that aims to achieve learning goals. One of them is the environment at SMK N 2 Batusangkar which is used as an edupark (educational park) in the form of hydroponic cultivation which has physics concepts that have not been implemented. Based on need for learning resources in learning physics, a preliminary analysis of the physics material at school with the potential of edupark is available. The type of research is a research development using the Plomp model in the initial research phase that aims to analyze the physical concepts which is contained in hydroponic aquaculture edupark. The data used is obtained from interviews and questionnaires that were developed based on learning process parameters, learning tools, student characteristics and environmental characteristics, as well as a description of the potential of edupark, especially those supporting physics subject matter including fluids, temperatures, heat, light intensity, capillarity. Based on the results of preliminary research, it appears that the importance of developing hydroponic aquaculture edupark textbooks in physics learning.
Design of integrated science student book theme adaptation of the human body to change temperature integrated 21st century learning using integrated types
Authors: Supriadi T , Ratnawulan  , Syafriani  , Samra A
Published: May 2020

The implementation of integrated science learning in junior high schools is still not thematic and integrates 21st century learning into the learning process. 21st Century Learning requires students to have literacy skills, knowledge skills, skills and attitudes, and mastery of technology. Increased knowledge, attitudes and skills are caused by the lack of availability of relevant learning resources. One learning resource that can improve 21st-century skills is students’ books. The method used in this study is the model of plomp development which consists of three stages, namely preliminary investigation, Prototyping stage, Assessment phase. The research has reached the Prototyping stage and has been tested for validity. The instrument used in this study is a questionnaire consisting of Aspects of content; Construction Aspect; Language aspects; Integrity aspect.
The effectiveness of guided inquiry student worksheet to improve high order thinking skill in buffer solution material
Authors: Yani Fitra Handa , Mawardi Mawardi , Rusiani Js Aisyah Fitri
Published: May 2020

This study revealed the effectiveness of guided inquiry student worksheets in improving high order thinking skills in buffer solution materials. This study was conducted with a non-equivalent control group design that uses 72 students as samples which are divided into experimental groups and control groups. The instrument used in this study is a high order thinking skills test given to each student before learning as a pre-test and after learning as a post test. Based on the results of the study, the N-gain value in the experimental class is higher than the control class, each of which has a value of 0.85 and 0.74. From the results of the t test using the SPSS statistical application, the significance value is 0,000 at the 95% confidence level and significance level (α = 0.05). Significance value <α so that it was concluded that the use of guided guided worksheet was effective in improving high order thinking skills of students.
Design of edupark Physics book with Project Based Learning based on Ngarai Sianok National Geopark, Indonesia
Authors: Emafri Wenda , Sari Dewi Puspa , Rifai Hamdi , Yohandri
Published: May 2020

Ngarai Sianok is a Nasional Geopark, Indonesia. Utilizing Geopark as learning resources material of physics was named “Edupark”. Ngarai Sianok Physics Edupark is using geopark Ngarai Sianok as physics material for learning. This research aims to develop the the book as learning device in the form of Physics Edupark book using Project Based Learning (PjBL) used Ngarai Sianok National Geopark information at Senior High School Physics Book which are valid. The type of this research is development research. This research used a first prototyping phase Plomp’s model (Self Evaluation. In the prototype phase is conducted the design of learning devices based on PjBL for the second grade of Senior High school. The result of design of the physics edupark book based on Ngarai sianok national geopark at the beginning were called prototype 1.
Validity of development of Physics student’s worksheet based on Inquiry Training Model to improve students creative thinking ability 10th grade Senior High School
Authors: Yuliska Rumi , Syafriani
Published: May 2020

This study aims to determine the validation of inquiry training based physic students worksheet to improve creative thinking ability 10th grade senior high school in Pertiwi 2 Padang city. This research method used research and development. The evaluation of the validity of LKPD is important to determine whether a LKPD has a proper quality. This study sought to evaluate the validity of the LKPD on the aspects of content, Construct, language and Graphical using a valid questionnaire which was developed based on Likert scale. The validity of the LKPD was assessed by three educational experts and practitioners. The data was later analyzed to determine the value of V of Aiken. The V of Aiken value of experts and practitioners on the aspect of content is 0,90, on the aspect of LKPD presentation style is 0,90, on the aspect of language is 0,96, on the aspect of face is 0,95. The value of V showed that the content, presentation style, language and face of the LKPD is categorized as valid. This means the LKPD has satisfied most of its standard quality criteria.
Validity of integrated natural science teacher book with theme senses of sight and optical devices using connected model integrated 21st century learning
Authors: Melati Ayu , Weri Firda , Ratnawulan  , Syafriani
Published: May 2020

This study aims to determine the validation of Integrated Natural Science teacher book with the theme senses of sight and optical devices using Connected model Integrated 21st Century Learning at the junior high school in Kerinci district. This research method used research and development, using Plomp development model. The instrument used was a validation questionnaire. The data collection technique uses a validation questionnaire that was previously validated by five validators. Data collected was analyzed using descriptive qualitative through assessment and percentage. Results of analysis the validation of Integrated Natural Science teacher book with the theme senses of sight and optical devices using Connected model Integrated 21st Century Learning has an average value of 0,88 this is showed that is developed was valid.
Need analysis in the development of teaching materials with problem solving-collaborative models in quantum physics courses
Authors: Hidayati  , Elizar  , Festiyed
Published: May 2020

This study aims to analyze preliminary data on the conditions of quantum physics lectures as a necessity in developing teaching materials. This research is the initial stage of research and development, namely preliminary research. Data collected using interviews with lecturers, questionnaires to students and study documentation. Data analysis techniques used in the form of descriptive statistical analysis. From the data analysis that has been done it can be stated that the available quantum physics teaching materials have not varied. Second, the assignments given in lectures on quantum physics have been able to help students understand the material. Third, students have sufficient potential in understanding the material, but the percentage of students who have ideas in solving problems and who are able to correct answers from friends, want to work collaboratively and who actively ask questions is still low. For this reason, it is necessary to develop media and teaching materials to improve the lecture and collaborative processes of students.
Supporting STEM and critical thinking on energy transformation topic: pre-study of digital reality book
Authors: Muttaqiin A , Putri R E , Sari M P , Lufri L , Rahim F R
Published: May 2020

Technology is growing rapidly. Many devices could be used to support the learning process in the classroom, particularly in integrative science learning. Nowadays, learning materials can be acquired through various digital forms. In this study, the tendency of the needs and interests of students toward learning materials, specifically in energy transformation topic, would be briefly explained. Based on the data obtained, students were more curious when they were provided the supporting learning materials such as pictures and videos while learning the energy transformation topic. The data illustrated that 64.3% of respondents stated that the combination of text, images, and videos enhanced their curiosity on the matter. Some questions must also be provided to improve their STEM knowledge and critical thinking. Therefore, Digital Reality Book with many features can be selected as an alternative to deliver learning material about Energy Transformation in supporting STEM and critical thinking.
Availability of learning resources for enrichment learning at senior high school in West Sumatra
Authors: Festiyed  , Desnita  , Afradisca Elfa , Sari Iis Purnama
Published: May 2020

The ongoing learning process consists of planning, implementation, assessment and evaluation, reflection, feedback, and further revision or new planning. The results of the evaluation of competency achievement by students determine the feedback action and the next plan that will be carried out by the teacher. Based on the results of the evaluation, students are divided into two groups, namely groups that have achieved competence and groups that have not yet achieved it. The first group needs enrichment learning while the second group needs a remedial program. A survey of 24 Senior High Schools in West Sumatera was conducted to obtain information about the implementation of enrichment learning. The data collection instrument used is questionnaire and observation sheet. Information is obtained that teachers rarely carry out enrichment learning, because when children are in school it is fully filled with regular learning activities and teaching materials used by teachers only textbooks, which are only used up for regular learning activities. Referring to the information obtained, it can be said that Senior High School physics learning requires teaching materials that facilitate students learning outside the classroom. These teaching materials should facilitate students to learn without a teacher. So that teaching materials attract students’ interest must be packaged in such a way, for example ICT-based. One learning resource that meets these needs is a contextual-based physics module. To be practical and make it easier for students to adjust the place and time of each, then the most appropriate is the e-module physics. Based on observations made, there are no physical e-modules in the school observed. Referring to the problems that have been obtained, it can be concluded that to help teachers solve problems, contextual physics based e-modules need to be developed.
Preliminary analysis of integrated science teaching based on edupark of Anai Land
Authors: Delvi Meri , Rifai Hamdi
Published: May 2020

Utilizing environment-based media in learning can better understand the natural phenomena that occur in everyday life, the environment provides a variety of things students can learn, and the use of the environment allows for a more meaningful learning process. One of them is utilizing natural tourism objects which lately are very popular with tourists. Tourism is not just a place to enjoy the natural charm and games provided. Attractions as integrated learning resources (edupark) have not been fully utilized, one of which is Anai Land attractions. To support Anai Land as the Edupark Science School, plu to study Integrated Science learning material that can be learned through Anai Land tourist destinations. Based on this, analyze the integrated science learning material used in schools with potential learning resources in Anai Land tourist attractions. This type of research is a preliminary analysis. The data taken in this study was obtained by interviews with educators as well as a description of the potential direct learning of natural sciences with the Anai Land tourism method. Based on the results of the research conducted, it is evident that there is a need to develop edupark based teaching materials on natural science learning.
Senior high school mathematics learning device development based on guided discovery to improve students’ reasoning ability (preliminary research)
Authors: Faizasari A , Yerizon  , Permana D
Published: May 2020

Students’ mathematical reasoning ability that can be found in the field has optimal yet, this can be seen from school learning, and teacher has yet got the students to get used to solve the mathematical reasoning questions. The purpose of this research is to produce mathematics learning device based on guided discovery to improve students’ reasoning ability. This is a development research. The development model in this research is plomp model which consists of three phases, namely, preliminary research, development or prototyping phase, and assessment phase. The researchers hinge only on preliminary research. The result of the data analysis on this first phase revealed that: 1) the students’ reasoning ability is not yet optimal. 2) Some students’ still think mathematics is a difficult subject to learn. 3) The development of student worksheet is of vital importance in order to be able to comprehend the learning material. 4) Students expect that student worksheet will discuss problems related with mathematics knowledge in daily life as well as problem related with their individual activity.
Improving the problem-solving skills through the development of teaching materials with STEM-PjBL (science, technology, engineering, and mathematics-project based learning) model integrated with TPACK (technological pedagogical content knowledge)
Authors: Purwaningsih Endang , Sari Annisa Maya , Yuliati Lia , Masjkur Kadim , Kurniawan Bahrul Rizky , Zahiri Megat Aman
Published: May 2020

The biggest challenge for teachers in this industrial revolution 4.0 is to create a learning design that improves students’ problem-solving skills. Many students face difficulties in applying physics concepts in life since their problem-solving skills are relatively low. Therefore, valid, practical, and effective teaching materials with the STEM-PjBL model integrated with TPACK can be used as the breakthrough. This learning tool is packaged in five steps with various learning experiences, and the students are directly involved in using ICT, making a video, PPT, and using moodle. This research and development used 4D design with four stages, i.e., 1) define, 2) design, 3) develop, and 4) disseminate. In the define and design stages, need analysis and development of draft teaching materials were carried out. Development is an expert validation stage, and its results were declared as very valid. Dissemination is a limited trial phase with one group pretest-posttest design to see its practicality and effectiveness. The results of dissemination were stated to be very practical, showing that the learning plan can be well implemented. The students’ problem-solving skills increased after they attended learning by using the developed device. Other findings showed that students were more excited, happy, and comfortable in learning physics.
Development of high school physics class XI book, based on concept map to enhance the high-level thinking skills (HOTS)
Authors: Gusnedi G , Ratnawulan R , Putra A
Published: May 2020

Low high-level thinking skills (HOTS) of students, especially in physics can not be separated from the process of learning activities of students in schools that have not emphasized the student-centered. One problem is the books or reading material that is used by high school physics students and teachers have not led to the aspects of cognitive domains that are part of high-level thinking skills. Based on those developed for high school physics textbook using concept maps in both the material and the exposure to examples and exercises for students. The study aims to gain if the book is worth to be used in schools. Development model used in this study is a model of Plomp. ModelPlomp consists of three stages of development that preliminary research (initial investigation), prototyping phase (phase prototypes) and assessment phase (phase assessment). To assess the feasibility of this book used some experts consisting of several professors of physics and school physics teacher. The results of the feasibility test of power obtained an average score of 3.65 with very good category. Feasibility in terms of the depth of material, kesesuai with the development of the students thought patterns and linkage map concept with high-level thinking skills. While the results of feasibility assessment of conformity with the curriculum, the ease of understanding the text, the feasibility of the exercise presented by the teachers obtained a score of 3.80. The results of the feasibility test of power obtained an average score of 3.65 with very good category. Feasibility in terms of the depth of material, kesesuai with the development of the students thought patterns and linkage map concept with high-level thinking skills. While the results of feasibility assessment of conformity with the curriculum, the ease of understanding the text, the feasibility of the exercise presented by the teachers obtained a score of 3.80. The results of the feasibility test of power obtained an average score of 3.65 with very good category. Feasibility in terms of the depth of material, kesesuai with the development of the students thought patterns and linkage map concept with high-level thinking skills. While the results of feasibility assessment of conformity with the curriculum, the ease of understanding the text, the feasibility of the exercise presented by the teachers obtained a score of 3.80.
Knowledge analysis of students in disaster mitigation mount erupts
Authors: Kurnia Rizki , Fauzi Ahmad
Published: May 2020

The purpose of this study was untukmenganalisis the extent to which the knowledge of students in disaster management volcanoes and coherence of the matter physics. This type of research is descriptive qualitative peneitian. The sample used in this study are students of class X SMA N 1 Batipuh. The result is knowledge migasi learners to disasters volcanoes of 61.33% categorized as very poor and linkages with disaster physics of matter volcanoes obtained at KD 3.9 on material and energy businesses and KD 3:10 on the material momentum and impulse.
Further development of the modified Eddy Dissipation Model
Authors: Chen Yongliang , Huang Qinhuang , Wang Peiyong
Published: May 2020

The eddy dissipation model (EDM) has been used extensively in turbulent combustion modelling because of its simplicity, good convergence, and reasonable accuracy. A modified EDM model was developed to improve the accuracy of the model a few years ago. In the application for the jet flame and the opposed jet flame, it demonstrates very good accuracy. However, in the application for the bluff body diffusion flames, its accuracy is not good enough. In the current study, it is found out that the existence of wall of these flames influences the simulation accuracy. In the region near the wall, the ratio of turbulence dissipation rate to turbulent kinetic energy is too large and causing too high combustion reaction rate which is not realistic. By adding a limit to this ratio, the reaction rate near wall will be reasonable. The further developed modified version of EDM model gives very good prediction accuracy for the jet flow and the bluff body flow. With this near wall treatment, the modified EDM model will show good performance for internal combustion and free jet combustion.
A procedure for power consumption estimation of multi-rotor unmanned aerial vehicle
Authors: Chan C. W. , Kam T. Y.
Published: May 2020

Unmanned aerial vehicles (UAVs) have the potential to find many commercial applications, which may require relatively long mission times. Therefore, it is important to make UAVs that can complete the mission in an efficient and power saving way. To achieve a prescribed flight mission, a UAV has to perform a number of maneuvers/movements, which will consume a certain amount of power. To maximize the cruising time, not only the power source is able to provide enough amount of power to the UAV but also the parts of the UAV can perform efficiently to save power. Before the minimum power capacity can be determined, it is required that the power consumptions of the UAV parts for the required mission be evaluated in a proper way. In this paper, a procedure is presented to estimate the power consumption of a composite UAV. The configuration as well as the fabrication of the UAV using truss-type parts made of carbon strand/epoxy composite material will be briefly introduced. The power consumptions of the propeller system and electric parts will be evaluated in a systematic way. Experiments were conducted to verify the theoretical predictions. Flight tests were also performed to study the power consumption of the UAV and the suitability of the proposed procedure for power consumption calculation.
The performance of an acoustic levitator
Authors: Hsu C H , Lin H Y , Agarwal A , Davis I , Nolan K P , Lua K B
Published: May 2020

An acoustic levitator uses an array of ultrasonic transducers to generate a standing acoustic pressure field which exerts a radiation force on small particles, allowing the particles to be trapped, relocated, separated or combined. Experiments on levitating particles of different densities and calculations of the acoustic radiation force and moment have been reported in the literature. However, direct inspection on the acoustic pressure field pattern is seldom carried out. This paper reports an investigation on the performance of an existing acoustic levitator design, which uses off-the-shelf components, by comparing the visualized pressure field from Schlieren imaging to analytical simulations. The ability to compare Schlieren imaging results to analytical simulations readily can prove to be a vital tool. Since the simulations provide an ideal pressure field, the imaging of the levitator pressure field can highlight discrepancies between the real and ideal cases. This can be especially useful as a diagnostic tool to identify the cause of a drop in performance of the acoustic levitator in a real world scenario.