bluuebunny/crossref_metadata_2025 huggingface dataset:
Phenomenology of quantum turbulence in superfluid helium
Authors: Skrbek Ladislav , Schmoranzer David , Midlik Šimon , Sreenivasan Katepalli R.
Published: March 2021

Quantum turbulence—the stochastic motion of quantum fluids such as
4
He and
3
He-B, which display pure superfluidity at zero temperature and two-fluid behavior at finite but low temperatures—has been a subject of intense experimental, theoretical, and numerical studies over the last half a century. Yet, there does not exist a satisfactory phenomenological framework that captures the rich variety of experimental observations, physical properties, and characteristic features, at the same level of detail as incompressible turbulence in conventional viscous fluids. Here we present such a phenomenology that captures in simple terms many known features and regimes of quantum turbulence, in both the limit of zero temperature and the temperature range of two-fluid behavior.
Van der Waals interaction affects wrinkle formation in two-dimensional materials
Authors: Ares Pablo , Wang Yi Bo , Woods Colin R. , Dougherty James , Fumagalli Laura , Guinea Francisco , Davidovitch Benny , Novoselov Kostya S.
Published: March 2021

Significance

Instabilities and formation of complex patterns play an extremely important role in many branches of science. Understanding the origin of instabilities is very important for many technologies. We demonstrate the formation of instabilities (radial wrinkles around bubbles) in atomically thin crystals. Two-dimensional crystals, arranged into van der Waals heterostructures, allow full control over the mechanical properties of the components and the interaction between them, making such experiments easy to reproduce and allowing one to understand the basic, underlying physics of such effects. Such heterostructures allow the observation of instabilities around structural defects (bubbles) where the crystal structure plays a significant role, providing insights into these effects. Such instabilities allow assessment of the elastic and interaction properties of the membranes.
Phragmidium arcticum.
Authors:   USA, USDA-ARS
Published: March 2021

There is little published information on this plant pathogenic fungus, which has limited distribution. It infects Rubus spp., which exist in other regions of the world with similar environmental conditions, therefore this species may pose a threat to native or agricultural plants if introduced.
Cryptostegia madagascariensis (Madagascar rubbervine).
Authors: Rojas-Sandoval Julissa , Acevedo-Rodríguez Pedro
Published: March 2021

C. madagascariensis is a fast-growing invasive woody vine. Plants can begin to reproduce after about 200 days and they can produce large amount of seeds which are rapidly dispersed by wind, floodwaters, or stuck to the fur of animals (Starr et al., 2003). Seeds can remain viable up to one year and studies have reported germination rates ranging from 90 to 95% (Starr et al., 2003; Vieira et al., 2004). C. madagascariensis has the ability to quickly spread along water courses, coastal forests, pastures, forest edges, and disturbed areas. The plant can form dense impenetrable thickets by climbing up trees and covering them, and may also displace and out-compete native vegetation.
Tanacetum vulgare (tansy).
Authors: Gassmann André
Published: March 2021

T. vulgare is an aromatic perennial herb native to much of Europe and parts of Asia. It has been introduced into Argentina, Australia, Canada, Chile, Guadeloupe, Martinique, New Zealand, Peru and the USA. In many parts of its exotic range, T. vulgare is neither an ecological nor an economical problem. In the northern temperate zone of North America (in particular in Canada), T. vulgare has become a noxious dominant weed in pastures, hay fields, riparian habitats and wastelands. Here, the perennial competes with both biennial and perennial herbs, as well as with grasses. It can displace native habitats and reduce the diversity of plants and insects. Due to its toxicity to livestock, particularly cattle, positive selection can be observed when T. vulgare grows under the conditions of grazing.
Idioscopus nitidulus (mango leafhopper).
Authors: Ganeswaran R
Published: March 2021

According to Viraktamath (1989), 14 idiocerine species in three genera (Amritodus, Busoniomimus and Idioscopus) breed on mango, and of these only six are of economic importance. Mango leafhoppers are major pests in the Indian subcontinent. The major damage caused is at the flowering stage and several studies have highlighted the reduction of yield which may be between 20 and 100% depending on population size. Verghese and Rao (1987) examined the critical infestation stages of the related species I. clypealis in Uttar Pradesh, India. The mean density of cicadellids was 0.54-20.64 per panicle in 1983 and 0-6.03 per panicle in 1984. In both years, the peak population occurred when the fruit was pea sized. At the post-bloom stage a population of two adults per panicle was sufficient to cause yield reduction. It is suggested that the critical infestation stages are at post-bloom, when the fruit is marble sized, and 1 month before harvest, with corresponding critical population levels of two adults, 6-21 nymphs and 4-11 hoppers per panicle. In the Philippines, Corey et al. (1989) found that the economic injury levels for I. clypealis on two croppings of mangoes averaged 4.21, 4.30, 4.45 and 4.55 adults per panicle at 2, 10, 18 and 26 days, respectively, after flower bud break for the first cropping, and 4.79, 4.88, 5.06 and 5.18 adults per panicle for the second cropping.
Amaranthus spinosus (spiny amaranth).
Authors: Rojas-Sandoval Julissa
Published: March 2021

A. spinosus is a serious weed in tropical and subtropical regions of the world. For instance, it is a troublesome weed in agricultural areas, pastures, and orchards in Africa, Asia, Europe, Australia, and the Pacific region. In those regions, it is also a serious environmental weed in disturbed sites, secondary forests, along forest edges, and around water troughs (Lemmens and Bunyapraphatsara, 1999; Motooka et al., 2003; PIER, 2015; PROTA, 2015; USDA-ARS, 2015). The plant has large thorns which make it unpalatable for grazing livestock and make weeding difficult in parts of the world where hand weeding and harvest are done by hand. Like other amaranths, it produces large numbers of seeds, which can mature after the plant has been cut, and remain viable for long periods.
Thecaphora solani (potato smut).
Authors:   USA, USDA-ARS
Published: March 2021

T. solani is a smut fungus attacking tubers and underground stems of Solanum, including potato [Solanum tuberosum] and tomato [Solanum lycopersicum], in the Andean region of South America. It is not restricted to the higher, cooler elevations, but has been a problem in coastal Peru (Bazan de Segura 1960; Zachmann and Baumann, 1975) and also occurs in Mexico. It may be transported in infected tubers and planting material and, very likely, on their surfaces if they become contaminated with the spores. The fungus survives in the soil and is difficult to eradicate; it can infect at least one common solanaceous weed. Losses of 80% or more have been reported in susceptible varieties. EPPO lists it as an A1 plant pest (OEPP/EPPO, 1979).
Calliandra houstoniana var. calothyrsus (calliandra).
Authors: Rojas-Sandoval Julissa
Published: March 2021

C. houstoniana var. calothyrsus is a nitrogen-fixing tree legume which has recently become popular for use in small-scale tropical agroforestry due largely to its provision of fuelwood and animal fodder, and its tolerance of acidic soils. Genetic variation within the species has been the subject of widespread international evaluation and has revealed variation in productivity amongst provenances. A problem with poor seed production has been reported in a number of countries where C. houstoniana var. calothyrsus is planted.
Euphorbia tirucalli (Indian-tree spurge).
Authors: Rojas-Sandoval Julissa
Published: March 2021

E. tirucalli is widely used in windbreaks, live hedges, as fuelwood and for erosion control plantings. In dry areas, it plays a major role as fodder for camels and goats. It has potential for hydrocarbon production (Hall, 1985), but this has not been fully studied and there is therefore a need to initiate further research in this area. Moreover, research has showed that the species can produce other chemicals which can make its planting more economical.
Ficus benghalensis (banyan).
Authors: Rojas-Sandoval Julissa
Published: March 2021

F. benghalensis is a very large, long-lived evergreen tree with thick spreading horizontal branches, from which numerous aerial roots descend and take root, forming new trunks. It is endemic to India and the sub-Himalayan region, and inhabits evergreen and semi-deciduous forest. F. benghalensis has been introduced in Uganda, Zanzibar and Florida. In India, it is considered a sacred tree with wish-fulfilling properties.In the wild, F. benghalensis is naturally dispersed via the excrement of birds and monkeys, and only seeds deposited in the canopy will germinate. This species initially exists as an epiphyte that will rapidly send down roots and begin to envelop the host tree, eventually killing it. F. benghalensis is a strong light-demander and is unable to germinate or grow in the shade (Hocking, 1993). It is frost-hardy, and the leaves may recover quickly from severe frosts. It is susceptible to fire, although seldom are its many stems all killed by fire. F. benghalensis is drought-resistant, though it may lose leaves in hot dry seasons. The wood is of poor quality, and is mainly used for fuelwood, boxes, posts, and small agricultural implements. Due to its durability under water, the wood is used to form well-curbs. Generally the fruit is only eaten in times of famine. F. benghalensis has medicinal properties: the sap is used to treat rheumatism and lumbago; the bark may cure dysentery, diarrhoea and diabetes; leaves are applied to abscesses; and root fibres are used in gonad problems (Hocking, 1993). An inferior rubber may be obtained from the latex of the bark. F. benghalensis can be artificially propagated by cuttings or seed. Both seedlings and cuttings require light and plenty of moisture for optimum growth (Gupta, 1993). F. benghalensis tends to grow slowly in less preferred conditions, such as acid soils, high rainfall, cool temperatures and coastal belts (Hocking, 1993). Aerial roots may begin to develop after 15-20 years, and regular pruning will prevent excessive canopy development. F. benghalensis is extensively planted for shade and as an ornamental in gardens, villages or along roadsides. The aggressive nature and spreading crown of this species make it unsuitable for unmanaged cultivation. However, with regular pollarding, heavy lopping and pruning of aerial roots, it is suitable for silvopastoral systems, and is used to provide fodder and hedging (Hocking, 1993). It is also used to reclaim wasteland and sand dunes.
Toona ciliata (toon).
Authors: Dixon Christopher
Published: March 2021

The family Meliaceace contains some of the world's finest grade cabinet timbers. These include the Honduran mahogany (Swietenia macrophylla), West Indian mahogany (S. mahogani), Ugandan mahogany (Entandrophragma sp.), Asian Chukrasia (Chukrasia tabularis) and the Australian red cedar or Indian Toon (T. ciliata). Timber of T. ciliata was exported from Australia to Calcutta, India, in 1795 just seven years after the first British settlement was established in Sydney, thus becoming Australia's first export. The harvesting of this species was very important to the economy of the early European settlement and the timber getters helped open up the coastal forests for later agricultural activities (Boland, 1997). The species was also arguably the first Australian plant species to have conservation measures placed upon it (Boland, 1997) when it was realised that the species was rapidly disappearing in areas near Sydney. In India, thirty years ago, timber of T. ciliata was said to be available in large quantities from Uttar Pradesh and in fair quantities from North Bengal and Assam (Anon, 1963). Timber is also available in small quantities from other areas; mainly from roadside trees and from trees on cultivated lands (Anon, 1963).
Bambusa bambos (giant thorny bamboo).
Authors: Rojas-Sandoval Julissa
Published: March 2021

B. bambos is a tall bamboo with densely thorny interlacing branches. It occurs naturally in deciduous and semi-deciduous forest, and is widely planted in forest and farmland throughout the plains of India. Traditionally, this species is cultivated for culms used in construction and weaving material, as well as the protection offered against intruders by its thorny branches. It is now also a major source of pulp for paper production.
The role of mechanical interactions in EMT
Authors: Murphy Ryan J , Buenzli Pascal R , Tambyah Tamara A , Thompson Erik W , Hugo Honor J , Baker Ruth E , Simpson Matthew J
Published: March 2021

The detachment of cells from the boundary of an epithelial tissue and the subsequent invasion of these cells into surrounding tissues is important for cancer development and wound healing, and is strongly associated with the epithelial–mesenchymal transition (EMT). Chemical signals, such as TGF-β, produced by surrounding tissue can be uptaken by cells and induce EMT. In this work, we present a novel cell-based discrete mathematical model of mechanical cellular relaxation, cell proliferation, and cell detachment driven by chemically-dependent EMT in an epithelial tissue. A continuum description of the model is then derived in the form of a novel nonlinear free boundary problem. Using the discrete and continuum models we explore how the coupling of chemical transport and mechanical interactions influences EMT, and postulate how this could be used to help control EMT in pathological situations.
Emergent O(4) symmetry at the phase transition from plaquette-singlet to antiferromagnetic order in quasi-two-dimensional quantum magnets*
Authors: Sun Guangyu , Ma Nvsen , Zhao Bowen , Sandvik Anders W. , Meng Zi Yang
Published: March 2021

Recent experiments [Guo et al., Phys. Rev. Lett.
124 206602 (2020)] on thermodynamic properties of the frustrated layered quantum magnet SrCu2(BO3)2 — the Shastry–Sutherland material — have provided strong evidence for a low-temperature phase transition between plaquette-singlet and antiferromagnetic order as a function of pressure. Further motivated by the recently discovered unusual first-order quantum phase transition with an apparent emergent O(4) symmetry of the antiferromagnetic and plaquette-singlet order parameters in a two-dimensional “checkerboard J-Q” quantum spin model [Zhao et al., Nat. Phys.
15 678 (2019)], we here study the same model in the presence of weak inter-layer couplings. Our focus is on the evolution of the emergent symmetry as the system crosses over from two to three dimensions and the phase transition extends from strictly zero temperature in two dimensions up to finite temperature as expected in SrCu2(BO3)2. Using quantum Monte Carlo simulations, we map out the phase boundaries of the plaquette-singlet and antiferromagnetic phases, with particular focus on the triple point where these two ordered phases meet the paramagnetic phase for given strength of the inter-layer coupling. All transitions are first-order in the neighborhood of the triple point. We show that the emergent O(4) symmetry of the coexistence state breaks down clearly when the interlayer coupling becomes sufficiently large, but for a weak coupling, of the magnitude expected experimentally, the enlarged symmetry can still be observed at the triple point up to significant length scales. Thus, it is likely that the plaquette-singlet to antiferromagnetic transition in SrCu2(BO3)2 exhibits remnants of emergent O(4) symmetry, which should be observable due to additional weakly gapped Goldstone modes.
Assessing graph interpretation of high school students: an examination by students’ gender
Authors: Riani V R , Sa’diyah L H , Purwanto M G , Ramalis T R , Samsudin A
Published: March 2021

The research aims to assess graph interpretation among high school students in Karawang. The research used the analytic description method because graph interpretation shows students’ conceptual understanding. This research is focused on the kinematics concept and participants involved student 10th grade of high school which consists of 72 students (25 male students and 47 female students). The instrument that used in this research is the standard test of Understanding Graphs-kinematics (TUG-K) which consists of 21 multiple-choice. The data were analyzed using the Rasch model. The results of analysis by using Winsteps 4.4.3 in the form of Wright map display indicate that graph interpretation of gender (male and female student) has a gap. The graph interpretation of high school students with Rasch model have conclusion there are the value of person reliability is categorized as “sufficient”, the person measure shows that the average ability of students is fair than the item difficulty, the outfit mean-square into acceptable category, which indicates the excellent conditions for measurement, the outfit standardized Z is categorized acceptable too and student code started from high ability graph interpretation (02F) headed for low ability (13M).
Collaborative problem-solving: how to implement and measure it in science teaching and learning
Authors: Putri I E , Sinaga P
Published: March 2021

Collaborative problem-solving (CPS) is an essential competency in the 21st century. However, this skill is quite complex due to the two-dimensional domain having to measure at once. This study is a literature review aimed to presents various CPS measurement methods from empirical research for the past 17 years. Hence, teachers can get insight to implement and to develop CPS assessment mainly for training students to solve complex problems. Based on this review, there are two broad methods to measure CPS including using computer environment and real-life context. The former allows measurement to be more accurate and quicker, while the latter enables students to experience face-to-face interaction during problem solving. However, the development of CPS assessment using a computer needs professional ICT and an adequate number of computers as well as a high internet connection. In Indonesia, the implementation of computer-based assessment faces many challenges, and only some schools in the city centre can meet that requirement. Hence, it can be an alternative to measure the interaction of students during the CPS activity by putting high consideration of the using pedagogical content to facilitate CPS environment.
The development of character and scientific knowledge of students through inquiry-based learning neuroscience approach
Authors: Asriyadin  , Yulianci S , Adiansha A A , Kaniawati I , Liliawati W , Muliana
Published: March 2021

Famous scientific characters and knowledge are well developed and developed in the context of education in schools. This study aims to optimize the use of inquiry models based on neuroscience approaches in learning physics to improve students’ character and scientific knowledge. This research is a quasi-experimental study conducted in one of the senior high schools in the tenth grade located in Bima Regency. The instrument used consisted of two tests to see an increase in scientific knowledge and a non-test to observe an increase in student character. Method This study uses one group pretest-posttest design and descriptive analysis techniques. The results of the research through the N-Gain normalization test showed that students ‘scientific knowledge increased in the medium category and the students’ character developed well according to the implications after the application of inquiry learning through the neuroscience approach to learning physics.
Preliminary analysis of module development by setting arguments through the application of scientific inquiry models to improve students’ scientific attitudes
Authors: Yulianci S , Asriyadin  , Nurjumiati  , Kaniawati I , Liliawati W , Muliana
Published: March 2021

Physics learning use scientific methods based on scientific attitudes to solve the problems they face. This study aims to conduct a needs analysis related to the application of the scientific inquiry model through the development of teaching materials in the form of modules with the help of argumentation settings to improve students’ scientific attitudes in learning physics. This type of research is descriptive qualitative with a case study approach, where the research subjects are teachers and class X high school students in one of the schools located in Bima Regency. The data processed in this study are primary data analyzed from observation sheets and qualitative interviews. data analysis use Likert scale. The initial analysis carried out consisted of module analysis and analysis of students’ scientific attitudes. The module analysis results that 50% learning difficulties, 83% needs, 80% performance, and 74% of graduate competency standards. The analysis results for the scientific attitude of students on average are in the good category obtained from the analysis for each indicator that is asking 76%, open thinking 71%, respecting the facts 73% and, critical thinking 75%.
Situation analysis of mathematical physics learning with online learning during the COVID-19 pandemic
Authors: Marisda D H , Ma’ruf M
Published: March 2021

This research was conduct to determine the situation of learning mathematics physics online during the COVID-19 pandemic. Participants in this study were physics semester 4th students of Universitas Muhammadiyah Makassar with 21 students. Data collection techniques include online interviews and questionnaires. The collected data analyzed by reduction, display, and conclusion drawing. The results of the study describe the learning process of mathematical physics not conducive during the COVID-19 pandemic outbreak. The problem that arises in the form of difficulty lectures in teaching explicit physics material that has many mathematical formulas and calculations. The difficulty on the part of students is that students experience limited costs to buy internet quota in online learning. The lecturer provides the solution by creating a mathematical physics module that is given in stages. This module is presented with language and examples of questions that are easily understood by students through the google classroom application. Lectures also occasionally use the zoom application, and Google meets to explain the material that is difficult to understand.
Application of STEM-based online learning to train creative skills of students in covid-19 pandemic periods
Authors: Sarnita F , Fitriani A , Anhar  , Utama J A , Suwarma I R , Widia
Published: March 2021

This aim of this research application of STEM learning with the 6th-semester student object of physics education study program STKIP Taman Siswa Bima. The research subject is creative thinking skills. This study uses a One Group Pretest - Posttest Design with Pretest design; to measure students’ creative thinking at the beginning of learning (Y_1), Implement STEM (X), and Posttest based learning; to measure students’ creative thinking at the end of learning (Y_2). The instruments in this study were student activity sheets, student response questionnaires, and instruments for assessing students’ creative thinking skills using open-ended questions via Google Form and assessing creative products produced by students. Student responses and activities were analyzed in terms of percentages, while for creative thinking skills students were analyzed descriptively qualitatively using N-Gain. The instruments in this study used open-ended and prototype tests. The test is used to see the level of creative thinking of students, while the prototype is used as an assessment of students’ creative products. Analysis of creative thinking skills with an average value of 78 is at the creative level, while creative products (prototype) with an average value of 84 are at a very creative level. So it can be concluded that the application of STEM-based online learning can train students’ creative thinking skills during the COVID-19 pandemic.
Development of pendulum oscillation worksheets (POWs) to practice science process skills
Authors: Gumilar D A , Efendi R , Ramalis T R
Published: March 2021

This research aims to develop the task of science process skills on harmonic vibration material. Science process skills are important skills to be trained in students to contain various skills needed in the learning process to study natural phenomena. This research is part of the effort to develop instrument sets in the form of assignments and skills rubric of the science process research method used is the method of developing ACD (analysis, construction, and development), worksheets that are made then validated by experts and to obtain further development suggestions. The results show that the worksheets that have been developed are good with a note of improvement in the aspects of the task structure and statements on the worksheets to be made clearer and supplementary information is added related to the physical quantities.
Development of interactive media based on mathematics with HOMTS and learning by doing orientation
Authors: Fadilah F , Priyanda R , Amalia R
Published: March 2021

Mathematics learning needs to act as a bridge between students’ everyday culture and mathematics in school. The digital age requires teachers to develop innovative interactive media that contains hands-on activities and can improve higher-order thinking skills. This research is a Research and Development (R&D) of interactive media, namely lectora inspire based on ethnomathematics with HOMTS orientation and learning by doing. The steps in this research are (1) potential problems; (2) data collection; (3) product design; (4) design validation; (5) design revisions; (6) product trials; and (7) product revisions. The results showed that lectora inspire based on ethnomathematics with HOMTS orientation and learning by doing is appropriate to be used as interactive media in learning linear equation systems for senior high school students.
Profile of mathematical ability of junior high school student in Cirebon based on TIMSS standards
Authors: Munaji  , Setiawahyu M I
Published: March 2021

This result of research on Trend In Mathematics and Science Study (TIMSS) scores of Indonesian students in 2011 puts it at the bottom. And until now there are still many references of mathematics students and mathematics researchers in Indonesia. However, there are no results of research on the position where students in the city of Cirebon currently in the TIMSS score. The method of the reasearch is survey method by taking a random sample of 491 students taken from eighth-grade students of public and private schools showed the average TIMSS score of students who answered correctly from the sample tested reached 58% with a standard deviation of 8. The average of student correct answer in Cirebon higher than national average or international average correct answer in all level at TIMSS in 2011, thus low level, intermediate level, high level and advance level. However, the mathematical ability of students in the city of Cirebon still needs to be improved because in intermediate level, high level, and advance level still less satisfactory. In gender differences perspective, mathematical ability female student better than mathematical ability of male students for all level at TIMSS in 2011.
A comparison between the enhancement of students’ mathematical critical thinking skill through the use of means-ends analysis (MEA) and Treffinger learning
Authors: Susanti N , Juandi D
Published: March 2021

This study aims to determine the comparison of enhancement students’ mathematical critical thinking skills between those who obtain Means - Ends Analysis (MEA) and Treffinger learning, as well as to find out the mathematical critical thinking skills of students who use Means - Ends Analysis (MEA) and Treffinger learning. The method used in this research is descriptive and quasi-experimental methods. The population in this study were students of class X MIPA SMA 3 Tasikmalaya. Two classes were taken randomly as samples, selected in class X MIPA 2 with 35 students as experimental class I using MEA and X MIPA 3 with 32 students as experimental class II using Treffinger learning. The instrument used was a test of students’ mathematical critical thinking skills. The data analysis technique used two mean difference tests, using a t-test with a significance level of 5%. The results of research and data analysis show that enhancement students’ mathematical critical thinking skills using MEA learning is better than those using Treffinger learning, critical thinking skills using learning are MEA included in both criteria and skills critical thinking using Treffinger learning is included in both criteria.
Application of listening team learning model in improving middle school students’ mathematical reasoning ability
Authors: Utami N W , Nurlaelah E
Published: March 2021

This study uses classroom action research conducted in Al-Mashum Middle School in Cianjur, West Java. It aims to determine the effectiveness of the Listening Team method toward students’ mathematical reasoning ability. The data is obtained by using a test instrument which gained in two cycles implementation, students interview and teachers observation. The result showed that; (a) The students and teachers activity in cycle 1 has increased, the average of students mathematical reasoning ability is 56.9, (b) In cycle 2 has increased with the value of 73.1. It shows that there is an improvement in students’ mathematical reasoning ability from cycle 1 to cycle to by the value of 16.2.
A systematic literature review on developing students’ statistical literacy skills
Authors: Aziz A M , Rosli R
Published: March 2021

Statistical literacy is crucial for preparing students to become part of a modern society that is continuously bombarded with arguments that are derived from data-based decisions. In this regard, the teaching of statistics is a fundamental aspect of the mathematics curriculum at any educational level. Therefore, this study presents a systematic literature review of 36 articles that examine statistical literacy skills among students. Specifically, this study focused on identifying teaching methods that influence the development of statistical literacy among students. It was found that four dominant factors influence the development of statistical literacy among students: the learning environment, students’ attitude, teaching method, and students’ basic knowledge. Some studies have focused on students’ demographic factors, including their age, gender, and grade level; however, there are no conclusive findings on their role in influencing the development of statistical literacy. The study also revealed the three most common teaching methods in statistical literacy studies were teacher-centered teaching methods, student-centered teaching methods, and materials-based teaching. Out of these methods, materials-based teaching was the most commonly used to develop statistical literacy among students. Based on the findings, implications for teaching and learning statistics were discussed.
Students’ ontogenic obstacle on the topic of triangle and quadrilateral
Authors: Lutfi M K , Juandi D , Jupri A
Published: March 2021

This research based on the students’ difficulty in solving problem in triangle and quadrilateral topic. The difficulties can be identified from the mistakes made by students when solving triangle and quadrilateral problems. It can be caused because of learning obstacle experienced by the students. The learning obstacle which was described on this research is only focused on ontogenic obstacle. The purpose of this research is to identify the ontogenic obstacle based on the mistakes of the students in topic of triangle and quadrilateral. This research used a qualitative approach. The research was conducted to 25 grade VII students in one of junior high schools in Sumedang and a teacher as participants. Furthermore, the students answered 5 questions in test given and then the researcher interviewed 3 students based on their answers on the test. The researcher analysed the data of this research by using triangulation method from data of students’ answer on the test given, also interview of the teacher and the students. The result of this research showed that the researcher identified the ontogenic obstacles experienced by the students on topic of triangle and quadrilateral. The first ontogenic obstacle is psychological ontogenic obstacle where the student were less interested to the learning process of triangle and quadrilateral topic. The second ontogenic obstacle is instrumental ontogenic obstacle where the student were mistaken to recognize the guideline line on the picture given, and the last ontogenic obstacle is conceptual ontogenic obstacle where the student did not understand the topic of quadrilateral well based on the learning experience of the student in measuring length and area.
Mathematical communication of junior high school student based on gender
Authors: Islami N N , Priatna N
Published: March 2021

Mathematics communication skill is one of the important abilities that students must have. This study aims to explain how mathematical communication abilities female and male students in solving rectangles problem. The subject of this study was 6 students who already studied rectangles in the class. In this research, the researcher used a qualitative method. There were found that male students tend to solve problems by stated it into the sketch. While female students tend to solve problems by restating with their own language.
The creative thinking process of junior high school students in solving mathematical problems
Authors: Rupalestari D , Juandi D , Jupri A
Published: March 2021

This study aims to describe students’ creative thinking process in solving mathematical problem. This study used descriptive qualitative method. The data were collected by using written test and interview. The test used six creative thinking questions that each two of them covered one of four indicators of mathematical creative thinking. The research subjects were five 8th grade students who have prior knowledge above the Minimum Mastery Criterion value taken from two research classes. The result shows that students can understand all the questions that indicate fluency, flexibility, and originality by read the questions repeatedly, write important information of questions on another paper, redraw, and imagine the problems situations in daily life. Students can give ideas well on fluency and originality questions by recall and carry out the knowledge but some students don’t provide different solution on flexibility questions. Students do the illumination process well by show the ability to count and carry out well-generated ideas. Students can solve the problem by using the trial and error method in any situation. Furthermore, the verification process is carried out by do a recalculation, read the question to adjust the purpose of the problem, and use other strategies to have the same answer.
Solution plan as a strategy to support students in modeling mathematics
Authors: Nuryadi A , Hartono
Published: March 2021

This research is a descriptive study that aims to describe the role of the solution plan as a scaffolding that helps students to solve mathematical modeling tasks. The subjects in this study were 32 students of grade VIII of Junior High School number 3 Ngaglik. Data collecting using observations and documents. The data collected in this study is in the form of field notes and students’ worksheets. During the learning process, students are given a worksheet about modeling mathematics and equipped with a solution plan, and then the researcher makes observations. The study results found that the solution plan can be used as a scaffolding to support students solve mathematical modeling problems, where the solution plan consists of four stages: understanding tasks, searching mathematics, using mathematics, and explaining results. The solution plan facilitates connecting students’ imagination with the context of the problem and connecting prior knowledge needed to solve mathematical modeling problems through questions or statements that do not directly lead to answers.
Students’ creative and innovation skill on chapter of Newton’s law using SSCS learning model
Authors: Tiyaswati I , Sarwanto  , Sukarmin
Published: March 2021

Creative and innovative thinking skills were among essential skills in a rapidly expanding world. These skills served to understand and solve real problems in the 21st century. The research aimed to analyze the improvement of students’ creativity and innovation skills in Newton’s law material using SSCS or Search, Solve, Create, and Share. The research method used is pre-experimental with the one group pretest-posttest design. The research samples were 29 grade 8 students of junior High school who were taken randomly at a school accredited A. Data collection using the Instrument test Essay on Newton’s law at the assessment rubric adapted from the P21 validated indicators. The instrument test used was valid and reliable. The results of N-gain on indicators consisting of Think Creatively, Work Creatively With Others, Implement Innovation were 0.47, 0.32, 0.55, and were in the medium category. Therefore, the SSCS learning model could improve creativity skills and innovation students primarily on the indicators think creatively and implement Innovation.
Analyzing the science misconception in mastery concept of ecosystem topic at senior high school
Authors: Putri S S , Rusyati L
Published: March 2021

This study aims to determine the percentage of biology misconceptions especially in ecosystem topics at senior high school. Ecosystem topics are basic in science. But there are still many students were got difficulties in understanding the concept, that causing misconceptions. A misconception is an explanation of the phenomenon according to the experience and student’s previous knowledge. This study used a descriptive statistics method. Profiling data was used to describe the percentage of mastery concept students and misconceptions. Multiple-Choice tests were chosen to measure the understanding of concept mastery and misconceptions in ecosystem topics. The results have shown the average of percentage in mastering conception is 58.65%, while the average percentage of misconception is 41.01%. It means misconceptions that are inversely proportional to the understanding of student concepts. Therefore, to reduce the misconceptions that emerge a needed an improved understanding of the concept.
A Rasch model measurement analysis on students’ concept mastery in food additives topic
Authors: Putri W A , Sanjaya Y , Eliyawati E
Published: March 2021

The students’ concept mastery is low in food additives topic in junior high school level. This study aims to analyze students’ concept mastery by using Rasch Model Measurement. The participants involved 70 students of grade VIII and IX grades consist of 30 boys and 40 girls. The result was shown from students have already studied food additives topic. Item is comprised of 30 multiple-choice questions. Data analyzed on person-reliability, item-reliability, and wright map. The findings showed Cronbach α was 0.69 (sufficient), item-reliability was 0.92 (excellent), and person-reliability was 0.65 (weak). It shows interaction between students and items were sufficient, so items can be used for students. Thus, most students could answer food additives questions. For better result, the researcher should make difficult item.
Enhancing students’ communication skill by creating infographics using Genially in learning climate change
Authors: Azizah D N , Rustaman N Y , Rusyati L
Published: March 2021

This study is aiming to investigate students’ communication skill in terms of verbal and visual on learning climate change topic as a socio-scientific issue. The communication skill attainment was assessed by incorporating infographics generated using Genially website. The research was conducted due to its significant role of the skill for students to become empowered global citizens in 21st century that requires the ability to communicate information to be easily understood and perceived concisely by the audience. The research method used is one group pre-post-test to investigate the enhancement of students’ ability before and after the experimental treatment. However, the result shows a good enhancement on average score for both verbal and visual competency areas with certain activities to sustain the whole communication skills.
The development of web based inquiry as online science inquiry environment
Authors: Yasin A I , Rochintaniawati D , Prima E C
Published: March 2021

This paper studies a research in the design and development of web based inquiry as online science inquiry environment. The web based inquiry is constructed to help junior high school students in understanding everyday science phenomena with guided inquiry framework and various sources of scaffolding. Furthermore, it is aimed to support teacher in designing their inquiry virtual class for new normal studying era. This study used 4-D development consisting define, design, develop, and disseminate as research method. At the beginning, it is stated about inquiry theoretical framework and online science inquiry environment underpinning for designing the web based inquiry, describe the features and components of the system, and explain workflow of web based inquiry’s instruction. Web based inquiry went through expert judgement with positive feedback. Afterwards, web evaluation questionnaire is distributed to science junior high school teacher to underline their perception regarding web based inquiry. The result of web evaluation questionnaire gained over 80% positive response. Therefore, web based inquiry can be used for both teacher and students in learning science with appropriate content navigation and layout.
Information and Communication Technology (ICT) knowledge of biology teachers in senior high school based on teaching experience
Authors: Almareta R , Paidi
Published: March 2021

The percentage of schools that have network and internet access in Indonesia has reached 77.89%. While the ability of teachers to use ICT 14.43%. This is supported by the qualifications of teacher knowledge about ICT for senior high school by 14,43%. This study aims to determine the level of ICT knowledge of biology teachers and determine the relationship of ICT knowledge with teaching experience. Teacher knowledge is measured using a multiple choice test instrument with digestive system material. The research respondents consisted of 23 biology teachers in senior high school. The validity and reliability test of the instrument was carried out using SPSS with a significance of correlation <0.423 and Cronbach’s Alpha 0.92 (very reliable). Data analysis of the ICT knowledge level of teacher using Microsoft Excel and to see the relationship of ICT knowledge with teaching experience using the One Way ANOVA test. The results showed the level of ICT knowledge of biology teacher from all three aspects was good with an average of 73.8. There is a significant difference between the level of ICT knowledge of the teacher and teaching experience of the teacher, sig 0.000 (p<0.05). The long teacher teaching experience does not provide good teacher ICT knowledge.
Student conception and misconception in drawing phosphorus cycle based on worked example learning
Authors: Faujiyati R , Rahmat A , Amprasto
Published: March 2021

The phosphorus cycle is still unfamiliar for students in the biogeochemical cycle. When worked example provides an opportunity for students to be able to learn from existing examples, this study seek to uncover the conceptions and misconceptions about the phosphorus cycle that carried out in the implementation of worked example learning. This research was conduct in the form of descriptive research by analyzing the diagram made by students and interviews conducted on some students whose diagram indicated contain misconception. Results showed that worked examples can help students to get a conception of the phosphorus cycle through the identification of the components involved in the phosphorus cycle, the relationships between components, and training students to trace phosphorus atoms. Misconception occurred only in a small proportion of students (10.58%) due to students’ limitations in understanding the concepts of chemical molecules and plant physiology. It also influenced by the presented examples during classwork.
Development of learning tools education for sustainable development (ESD) integrated problem-solving for high school
Authors: Fatiyah H N , Riandi  , Solihat R
Published: March 2021

The purpose of this study is to develop integrated learning tools for problem-solving for continuing education on the material changes in the environment of the X grade high school. The learning tools developed contain dimensions of knowledge, attitudes, and skills that are consistent with Education of Sustainable Development (ESD) demands and contain issues of sustainable development. The research method used is Research and Development (R&D). The data collection techniques used in this study are the analysis of learning design documents currently used in high school and the rubric of the assessment of integrated ESD learning tools for problem-solving given to experts to assess whether the learning tools are following the ESD context. The learning design used is an integrated learning tools to solve problems. The results of this study are products in the form of integrated ESD learning tools to solve problems by the curriculum-13 in Indonesia on environmental change material. Based on the results of assessments from experts, the learning tools still need an explanation of the concept of sustainable development with the context of the material so that students can associate the concept of sustainable development with environmental change materials.
The implementation of ESD into Biology learning to equip students with ESD competencies of systemic thinking and problem-solving
Authors: Saragih L , Riandi  , Solihat R
Published: March 2021

The purpose of this study is to equip students with ESD competencies of systemic thinking and problem-solving in the topic of environmental change. The weak experimental method with the one-group pretest-posttest design was used for this study. Twenty-nine students were selected by purposive sampling in grade X Public High School I Bandung. Data was collected through instruments written tests. Each test was arranged based on the indicator of systemic thinking and problem-solving that have integrated with the aspect of ESD (social, environment, and economy). Data was tested by N-Gain. Based on the results of the N-Gain category on student systemic thinking ability were high (0%), medium (48.27%), and low (51.72%). And then, the results of the N-Gain category on student problem-solving ability were high (0%), medium (72.41%), and low (27.58%). The result test of pretest-posttest scores of students’ systemic thinking ability showed an average of 69.13 and 80.03. Then, the result test of pretest-posttest scores of students’ problem-solving ability showed an average of 61.48 and 79.03. It can be concluded that the effort to implement ESD in Biology learning was quite successful in equipping students’ thinking systems and problem-solving skills.