bluuebunny/crossref_metadata_2025_split huggingface dataset:
Circular dichroism assisted bi-directional absorbers
Authors: Cheng Yang , Li Yongfeng , Wang He , Wang Jiafu , Qin Zhe , Qu Shaobo 
Published: October 2021

Abstract
Chirality, a geometric property that is of great importance in chemistry, biology, and medicine, has spurred many breakthroughs in the field of multi-dimensional metasurfaces that provide efficient ways of flexibly manipulating amplitude and phase of circular polarization (CP) waves. As one of the most important applications, chiral metamaterials can be used to implement novel absorbers. Herein, an ultra-thin wideband circular dichroic asymmetric metasurface was implemented via loading resistive film into chiral resonators. Opposite and reversible polarization conversion and circular dichroism (CD) were realized as being illuminated by CP waves from both sides meanwhile. Theoretical derivation and simulation verify that the polarization conversion and CD enhancement utilizing multi-layer CD metasurface. It is also found that the orientation angle of the meta-atom of each layer plays an important role in the CD enhancement, which paves a new way for CD enhancement. In addition, the coupling between the CD resonators was utilized to manipulate CD. On this basis, an ultra-thin polarization-insensitive absorber was achieved by employing a C4 2 × 2 CD resonator array, which was identical illuminating from front and back sides. Circular dichroic absorbers possess great potential in practical applications, ranging from stealth technology, antenna isolation, multi-functional microwave devices, chiral sensing, and catalysis.
A thin and optically transparent infrared-radar compatible stealth structure with low emissivity and broadband absorption
Authors: Tan Xiaoxue , Chen Juan , Li Jianxing 
Published: October 2021

Abstract
In this paper, an optically transparent structure that combines broadband absorption and low infrared (IR) emissivity for dual-band stealth is proposed. The whole structure includes two functional layers. The periodic resistive film of the upper functional layer acts on IR stealth. Its emissivity in the IR band of 8–14 μm is lower than 0.25. Another functional layer achieves greater than 90% wide absorption from 6 to 18.5 GHz. The whole optically transparent composite structure has a low profile of 0.141λ
0, where λ
0 is the wavelength of free space at the center frequency. It has absorptivity that is greater than 90% in the region of 5.7–16.5 GHz and has wide angular stability. The measured result is consistent with the simulation, which verifies the performance of the proposal. The IR-radar compatible stealth structure proposed in this paper has potential applications in the field of multi-spectrum compatible stealth.
High-density magnetic-vacancy inclusion in Co2MnGa single crystal probed by spin-polarized positron annihilation spectroscopy
Authors: Miyashita A , Maekawa M , Shimoyama Y , Seko N , Kawasuso A , Umetsu R Y 
Published: October 2021

Abstract
Co2MnGa is a Weyl semimetal exhibiting giant anomalous Hall and Nernst effects. Using spin-polarized positron annihilation spectroscopy, we examined a Bridgman-grown Co2MnGa single crystal with a nearly perfect L21-ordered structure and a reference Co2MnAl polycrystal with a Mn–Al-disordered B2 structure. We found that a large amount of magnetic vacancies (more than 100 ppm) were included in the Co2MnGa crystal but not the Co2MnAl crystal. We discuss possible reasons for the inclusion of vacancies, the role of vacancies in the development of the ordered structure, and the electronic states associated with the vacancies. Toward the development of Co2MnGa-based devices, the manners for reducing vacancies as well as the influence of vacancies on the electrical transport properties should be considered.
Spontaneous emission in inertial and dissipative nematic liquid crystals: the role of critical phenomena
Authors: Nascimento J H , Pinheiro F A , Silva Neto M B 
Published: October 2021

AbstractWe develop a rigorous, field-theoretical approach to the study of spontaneous emission in inertial and dissipative nematic liquid crystals (LCs), disclosing an alternative application of the massive Stückelberg gauge theory to describe critical phenomena in these systems. This approach allows one not only to unveil the role of phase transitions in the spontaneous emission in LCs but also to make quantitative predictions for quantum emission in realistic nematics of current scientific and technological interest in the field of metamaterials. Specifically, we predict that one can switch on and off quantum emission in LCs by varying the temperature in the vicinities of the crystalline-to-nematic phase transition, for both the inertial and dissipative cases. We also predict from first principles the value of the critical exponent that characterizes such a transition, which we show not only to be independent of the inertial or dissipative dynamics, but also to be in good agreement with experiments. We determine the orientation of the dipole moment of the emitter relative to the nematic director that inhibits spontaneous emission, paving the way to achieve directionality of the emitted radiation, a result that could be applied in tuneable photonic devices such as metasurfaces and tuneable light sources.
An approach to determine solution properties in micro pipes by near-field microwave microscopy
Authors: Wang Yahui , Wei Ziqian , Chen Yujie , Zhou Quanxin , Gong Yubin , Zeng Baoqing , Wu Zhe 
Published: October 2021

Abstract
In this article, we propose a quantitative, non-destructive and noninvasive approach to obtain electromagnetic properties of liquid specimens utilizing a home-designed near-field microwave microscopy. The responses of aqueous solutions can be acquired with varying concentrations, types (CaCl2, MgCl2, KCl and NaCl) and tip–sample distances. An electromagnetic simulation model also successfully predicts the behaviors of saline samples. For a certain type of solutions with varying concentrations, the results are concaves with different bottoms, and the symmetric graphs of concave extractions can clearly identify different specimens. Moreover, we obtain electromagnetic images of capillaries with various saline solutions, as well as a Photinia × fraseri Dress leaf.
Coordinated design of the cartridge-type blanket and the ceramic pebble divertor for the helical reactor FFHR-b3
Authors: Miyazawa J. , Goto T. , Hamaji Y. , Kobayashi M.I. 
Published: October 2021

Abstract
The cartridge-type blanket for the helical reactor has been updated and named the CARDISTRY-B3. Together with this, the ceramic pebble ergodic limiter/divertor system named the REVOLVER-D3 has been adopted in the design. There was a difficulty in fabricating the blanket cartridges due to the first wall shape with three-dimensional surface. This difficulty has been removed by introducing the slit first wall, where the first wall surface is formed by alternately stacking solid metal plates and porous plates made of metal or ceramic. The liquid metal flowing inside the blanket cartridge oozes out through the porous plates and forms the surface flow covering the first wall. Solid target plates for the helical divertor has been omitted, because the divertor region is already covered and protected by the liquid metal surface flow. The liquid metal freely falls inside the blanket cartridges by the gravity force and then exhausted to the pool set on the lower port. The ceramic pebbles, which are dropped to the inboard-side ergodic layer to form the flowing limiter divertor, also flow into the liquid metal pool. The pebbles and liquid metal are individually elevated again by screw conveyers. Since the free surface of the liquid metal is exposed to the plasma, the vapor pressure of the working liquid metal should be low enough. Ternary or quadruple alloys, which include Li, Sn, Pb (or Bi), and Er, have been selected as the candidates of the functional liquid metal for the CARDISTRY-B3 that satisfies the requirements of low vapor pressure, low density, low melting point, and high tritium breeding ratio. In this study, the coordinated design of CARDISTRY-B3 and REVOLVER-D3 for the FFHR-b3 is presented. The FFHR-b3 is one of the design options that aims at demonstration of 100 MW net electricity with two times larger devise size than LHD.
Video Based Experiment to Determine Focal Length of a Positive Lens in Physics Learning
Authors: Raida  , Iswanto B H , Sugihartono I 
Published: October 2021

Abstract
During the COVID-19 pandemic, conducting experiments in the lab has become constrained due to physical distancing protocols. Experiments activities are important to help students understand the concepts of physics, one of which is the optical learning of image formation on a positive lens. Video based experiment is one of the solutions that can be used as an alternative to do experiments activities in the laboratory due to the COVID-19 pandemic. This study aimed to design and develop a video based experiment to make students to determine focal length of a positive lens. This study used the R&D method with ADDIE development model reference (Analysis, Design, Development, Implementation, and Evaluation). According to the evaluation of material experts and media experts video based experiment covering aspects of content, material, language and presentation of media experts by 81% and material experts obtained by 84%, categorized as very high. Based on the results of the expert test, it can be concluded that the video based experiment is feasible to be used as an optical learning media for students in high school.
Module Electronic Sound and Light Wave Developed By Scientific Approach For Improving Science Literacy
Authors: Nenchi M , Budi A S , Rustana C E 
Published: October 2021

Abstract
The purpose of this study is to develop a physics learning media for Sound and Light wave physics learning in high school students. The research method used Analyze, Design, Development, Implementation and Evaluate (ADDIE) with one group pretest-posttest design method to improve scientific literacy. The research participants are students in grade eleven of high school students. The E-module was validated by experts and the results showed 84.59% for media expert, 83,49 % for material expert, and 79.75% for learning expert with very proper category. The instrument validation results for high school students were 84.27% with the very proper category. Based on the results of scientific literacy for high school students, the normalized gain score 0.79 with a effective category means E-module can improve students’ Science Literacy. So it can be concluded that, there is improving scientific literacy in students using the sound and light wave e-module based on a scientific approach.
The Video-Based STEM Experiment: An Observation of the Momentum of a Bouncing Ball
Authors: Sugihartono I , Sunaryo  , Rustana C , Luhukay J , Yaqin A A , Jalassuad K , Apriyansa A , Nugraha A 
Published: October 2021

Abstract
We have performed a video-based STEM experiment of a bouncing ball using a force plate logger sensor and Neulog application. Our objective was to observe the students understanding the relationship between impulse and momentum, examine this relation by bouncing a ball on a force plate logger sensor, and calculate impulse and change in momentum. All the data, such as raw data of force and time, video recorded, and the questions given to the 10th-grade senior high school students. Then, their answer will be analyzed to confirm the understanding of momentum during the learning process by video-based STEM experiments.
Enhancing Students’ Learning Activities Using Problem-Based Learning Model on Temperature and Heat Concept
Authors: Astra I M , Aminudin D , Henukh A 
Published: October 2021

Abstract
This study aimed to improve the learning activities of SMA Labschool Jakarta students in grade XI of MIPA 1 by applying the Problem-Based Learning model (PBL). The study was undertaken by employing a classroom action research method with 34 participating students on the topic of temperature and heat. The study was conducted in three cycles. The cycles are extended to; planning, action, observation, and reflection. The success indicator of the study was that students’ learning activities could reach > 75%. The data collection was through the use of an observation sheet and the implementation of the learning model. Based on the data analysis, the results indicated that students’ learning activities in the first cycle reached 41,7%. In cycle II, the score reached 61,76%. Finally, the score increased to 85,27% in cycle III. Therefore, it can be concluded that student learning activity increased. In other words, the results verified that Problem-Based Learning can significantly enhance students’ learning activities.
Review of Trends Project Based Learning (PjBL) Integrated STEM in Physics Learning
Authors: Solihin A , Wibowo F C , Astra I M 
Published: October 2021

Abstract
For physics teachers, how physics should be taught is an important question. This study, examines project based learning (PjBL) integrated in Science, Technology, Engineering and Mathematics (STEM). The aims of this study is to identify trends in PjBL integrated STEM in physics education. The method used is a bibliometric analysis method. 80 articles were collected from the literature of scholarly journals, both nationally and internationally through the Publish or Perish (PoP) application. The articles collected were analyzed using the VOSviewer application to obtain information. After analysis, information on the trend of PjBL integrated STEM was obtained by further analysis and by synthesizing it. The result of this study is that in recent years, Project Based Learning (PjBL) integrated STEM has become one of the trends and has become an option in implementing physics learning in schools. This can be seen from the many research, studies and discussions about PjBL integrated STEM in physics education. Based on the results of this literature study, several recommendations for future research were also obtained, namely so that PjBL integrated STEM can be better, it needs to be tried by adding various learning media in it, especially on-line learning media.
Perception of Novice Learners Using Blended Learning Approach During the Covid-19 Pandemic
Authors: Herliana F , Farhan A , Elisa  , Syukri M , Mahzum E 
Published: October 2021

AbstractThis study aims to determine the perceptions of students in physics education department, faculty of teacher training and education - Universitas Syiah Kuala who have just learned (novice learners) using the blended learning approach during the Covid-19 pandemic. This research is quantitative research with data collection using the form of questionnaires and interviews. The questionnaire to measure novice learners’ perceptions used a semantic differential scale. The indicators measured consist of 5 aspects, including: technology, classroom management, instructors, interaction, and instruction. The population of this study was all students of the Physics Education Department, faculty of teacher training and education - Universitas Syiah Kuala. Purposive sampling technique was used to select sample and obtained 250 novice learners of blended learning approach. The data analysis technique used is descriptive statistical analysis through the process of data collection, data reduction, data presentation, and conclusions. The results of this study indicate that the perception of novice learners of the blended learning approach is positive at 87.92%. However, there is still a negative perception on each indicator with a different percentage value. The Indicator of technological at 14.52%, class management at 11.32%, instructors at 10,99%, interaction at 11,70%, and instruction at 12.60%. The results of the research are expected to be of concern for lecturers in the physics education department to find out the obstacles of students in distance learning during the pandemic period and can be used as a reference for improving and developing distance learning using a blended learning approach to make it better.
Application of Online Science Practicum by Using Microsoft Teams and Learning Management System (LMS) During the Covid 19 Pandemic
Authors: Pertiwi W A , Sanjaya L A , Nadiyah  , Hasirah  , Haramen M , Budi A S , Zarvianti E , Puspa R W D , Sianipar L K , Qoiriyah W , Sitompul H 
Published: October 2021

Abstract
The research objective of this is to see how to apply science practicum online using Microsoft Teams and Learning Management System (LMS). The form of this research is classroom action research which aims to apply the online science practicum during the Covid 19 pandemic. Therefore, it is carried out using two cycles in the application of online science practicum. The subjects of this study were students of the seventh semester in the Natural Science practicum course. Through observation and evaluation, it is shown that in the cycle I the percentage of practicum implementation which includes aspects of preparation, process and data and practicum results is 87.5%, in cycle II it has increased to 92.5%. In the assessment aspect of the practicum report, the average practicum assessment obtained in the first cycle was 3.09 from the highest score of 4 and in the second cycle was 3.7, while the aspect of student knowledge about the use of the Microsoft team which was taken using google form was 93%. In the aspect of student knowledge about the use of Learning Management System (LMS) by 75% and aspects of student understanding in the implementation of online science practicum using Microsoft Teams by 75%.
Website of Physics Instructional (WoPI): Learning Physics from Home During COVID-19
Authors: Sanjaya L A , Nurkholis I , Iswanto B H , Wibowo F C , Fidhyallah N F , Puspa R W D , Ilmi N , Pertiwi W A , Sianipar L K , Rasmi D P 
Published: October 2021

AbstractIn recent years, the education system, especially in Indonesia, has begun to adapt to distance learning. Technology in the field of education has emerged. Therefore, this research has the aim of producing an E-module based on a STEM with website-assisted in learning Physics on rotational dynamics. This research was conducted by applying the research method of FODEM (Formative Development Method) and was limited to the development phase. The results of this study are E-module learning media assisted by a website that can be used through various electronic devices, with learning material based on the STEM (science, technology, engineering, and mathematics) approach that can help students understand physics subjects in rotational dynamics. Further research is needed regarding the validation of this STEM-based E-modules assisted with website.
TPACK Implementation in Physics Textbook: Practice Problem-Solving Skill in Newton’s Law of Motion for Senior High School Students
Authors: Bakri F , Kusuma KF , Permana AH 
Published: October 2021

Abstract
One of the skills needed in the 21st century is a problem-solving skill. This article describes the result of research on the implementation of TPACK in the physics textbook. The implementation of TPACK in the physics textbook is aimed to practice the problem-solving skill of senior high school students. The research method used is Research and Development with Dick & Carey model. Has been produced a physics textbook that integrates technological knowledge, pedagogical knowledge, and physics content knowledge in multiple representations with the stage to practice a problem-solving skill in Newton’s Law of Motion concept. The stages of problem-solving in the developed physics textbook are: (a) presents the problem at the beginning of the chapter; (b) asking several questions to focus the problem; (c) formulating hypotheses on the problem; (d) present the material in multiple representations based on pedagogical and technological studies, and (e) explain phenomena based on the physics concepts of being studied. The results of this study have been validated by experts, are physics material experts, learning experts, and textbook media experts. The validation result of the physics textbook was declared feasible to practice the problem-solving skill for senior high school students.
Brake Pad Characteristics of Natural Fiber Composites from Coconut Fibre and Wood Powder
Authors: Kholil A , Dwiyati S T , Wirawan R , M Elvin 
Published: October 2021

Abstract
The aim of the research is to develop brake pad of natural fibre composite from coconut fiber waste and wood powder. The characteristics of hardness, braking time and wear compared to the commercial brake pad had been studied. Test samples were produced by varying content of coconut fiber from 0 - 40% weight, wood powder content from 40% - 0 weight with 10% intervals. The percentage of polyester resin was made constant. The process of mixing ingredients started from filtering coconut fiber and wood powder using a filter with mesh size 40 μm. Then, the materials combined with certain composition into a container and stirred until evenly mixed. The composite poured into the mold was design appropriate the motorcycle disc brake pad dimensions. The test results of natural fiber composites on brake pads showed different characteristic values on hardness, wear, and braking time tests.
Design and Development a Wind Tunnel using the Honeycomb as a Wind Turbine Characterization Instrument
Authors: Nasbey H , Budi E 
Published: October 2021

Abstract
In this research, an open circuit wind tunnel system was developed with variations in the use of the honeycomb and not in the settling chamber. This system will be used as an instrument for testing the characteristics of wind turbines. Settling chamber, cylindrical with a diameter of 56 4 mm with a length of 150 mm. Contraction cone, a truncated cone with a large diameter of 564 mm and a small diameter of 460 mm and a height of 300 mm. The test section is cylindrical in shape with a diameter of 460 mm and a length of 500 mm. Diffuser, in the form of a truncated cone with a large diameter of 560 mm and a small diameter of 460 mm and a height of 400 mm. The use of honeycomb is aimed at reducing the value of the intensity of turbulence. The honeycomb consists of a PVC cylinder with a diameter of 8.5 mm and a length of 100 mm, placed in the settling chamber. The intensity of turbulence is defined as the ratio of the standard deviation to the mean value of the wind speed. The wind speed in the test section was measured using an anemometer at nine different measuring points around the center of a cross section of the test section. The nine-point wind speed was used to calculate the intensity of the turbulence. The turbulence intensity of the wind tunnel without honeycomb and with honeycomb in the settling chamber is approximately 0.864 and 0.178, respectively.
Feature Extraction of Tea Leaf Images using Dual-Tree Complex Wavelet Transform and Gray Level Co-occurrence Matrix
Authors: Iswanto B H , Alma  , Sugihartono I 
Published: October 2021

Abstract
Feature extraction is a very important part of machine learning to analyze and find relationships between objects of different categories. This paper aims to analyze the feature vectors of the tea leaf image produced by using a combination of dual-tree complex wavelet transform and gray level co-occurrence matrix techniques. The tea leaf image consists of four different categories, each representing different phases of tea growth and were acquired using a visible camera from eight different orientations. Feature extraction using Principle Component Analysis (PCA) shows that the texture features can identify a different category of the leaf images without being significantly affected by the difference in scale and orientation of the images.