bluuebunny/crossref_metadata_2025_split huggingface dataset:
Analysis mastery of concepts physics on the topics of energy for high school students in distance learning during Covid–19
Authors: Heryani T P , Sinaga P , Chandra D T 
Published: November 2021

Abstract
This study aims to analyze the students’ mastery of concepts on the topic of energy during the distance learning when Covid-19 pandemic. The method used in this study is descriptive quantitative. The sampling technique used purposive sampling, where the determination of the study sample is based on gender. The sample in this study is 116 people. Students’ mastery of concepts refers to Bloom’s Taxonomy, namely C1 to C4. The instrument used was a cognitive ability test with 22 multiple choice questions. Data were analyzed using scoring techniques with the Guttman scale. The scores obtained are made into percentages and the results are grouped by category. The results showed that during the distance learning process, the students’ mastery of concepts was in the “enough” category with a percentage of 54%. Based on each aspect, the mastery of the concept in the C1 aspect shows an achievement of 81% with the “very well” category, 49% for the C2 aspect in the “enough” category, 57% for the C3 aspect in the “enough” category and 48% for the C4 aspect with the “enough” category. From the results of the study, efforts are needed to improve students’ mastery of concepts through appropriate learning strategies.
Development of MATTERED (modul of heat and temperature based on android) for senior high school
Authors: Julaila Y , Fauzi A , Wahyuningsih D , Samsudin A 
Published: November 2021

Abstract
Physics is one of the subjects considered troublesome and unique by understudies, so it requires learning media to be able to get the concept of physics. This study points to create a learning module, to be specific MATTERED on Android-based Temperature and Heat for high school understudies. MATTERED is an android-based interactive module with respect to the concept of temperature and heat which is created within the frame of interactive multimedia. This research design uses Research & Development (R&D). MATTERED wasat that point created and approved by material specialists and media specialists, and tried on physics instructors and 90 understudies of class 11th grade in three high schools within the city of Surakarta, Central Java, Indonesia. Based on the comes about of the approval by the material and media master validator, a score of 87.44% was gotten, and the MATTERED trial on instructors and students each obtained a score of 95.03% and 96%, where all appraisals were included within the exceptionally great category. Based on this, it demonstrates that MATTERED is doable to be utilized in learning physics in class for students of class 11th grade.
Developing a Four-Tier Diagnostic Test to identify students’ conception on light and optic topic
Authors: Putri R A H , Widodo A , Rusyati L 
Published: November 2021

Abstract
Students’ conception affects students’ understanding, achievement, and how they relate the concept to others in science. The aim of this study is to develop a four-tier test to diagnose students’ conception on light and optic topics. It is a multiple choice question consisting of the main question, certainty index for the answer, reason, and certainty index for the reason. Light and optic topic is chosen because it is very close to students daily life and is an essential topic at school. This study involves 114 students of grade 10. The instrument was developed from a list of indicators. Once the instrument was constructed, it was tested and analysed using SPSS. The instrument undergoes two stages of validity and reliability test. The first test showed there are 13 out of 19 questions that are valid and reliable with 0.740 Cronbach’s Alpha. The remaining 6 questions were then revised and retested to 21 students of grade 10. The result showed the 6 questions are valid and reliable with 0.829 cronbach’s alpha. Students has medium level misconceptions and they have more scientific knowledge than misconception. In conclussion, 19 questions that are feasible to diagnose students’ conception on light and optic topic.
Digital literacy and cognitive abilities of preservice physics teacher in physics for school course using LMS3: How are the both correlated?
Authors: Rizal R , Rusdiana D , Setiawan W , Surahman E , Ridwan I M 
Published: November 2021

Abstract
The Covid 19 pandemic that hit Indonesia demands the physics for school course to be conducted online using a Learning Management System Supported Smartphone (LMS3). By using this application, prospective physics teachers can practice their digital literacy and strengthen cognitive abilities. This study aims to determine the correlation between digital literacy and cognitive abilities, in general and by gender, which are trained through physics for school course using LMS3. The descriptive research was conducted with survey method and involving 20 students at a university in Tasikmalaya. They are five males and fifteen females spread 18-20 years old. The instruments used in this research were digital literacy test and cognitive ability test. Both have been validated by 5 experts and have high reliability. The collected data were analyzed statistically using the Kolmogorov Smirnov test and the Pearson correlation test. The results of the normality test obtained α = 0.636 which indicates that the data is normally distributed. The correlation coefficient r = 0.626 which indicates that digital literacy and cognitive ability are strong correlated. Based on the results the digital literacy of prospective physics teachers must be adequate to support learning success, one of which is shown by cognitive abilities.
Enhancing students collaboration skills in learning geometrical optics trough the ICARE learning model at Kabawo
Authors: Fatima W O , Sadiyah L H , Siahaan P , Samsudin A , Novia H , Suhendi E 
Published: November 2021

Abstract
This study aims to see the improvement of students’ collaboration skills by applying the ICARE learning model to geometrical optics material. The method used is pre-experimental with one group prettest-posttest design. The sample used study were 31 students of class XI IPA2 with random sampling technique. The main instrument in this research is the researcher himself, while the supporting instrument is a written test in the form of an essay test and analyzed using the rubik’s collaboration skills. To find out the improvement of students’ collaboration skills, it was done by comparing the pretest and posttest scores and then analyzed using N-Gain. Based on the results of research using the ICARE learning model in improving students’ collaboration skills based on the N-Gain value, where the average N-Gain value is 40.05. This shows that students’ collaboration skills have increased in the moderate category after applying the ICARE learning model, while to see the implementation of the learning model using an observation sheet with a score of good category. The recommendation in this study is to pay more attention to the time management allocated for each aspect of ICARE so that each stage in ICARE can be carried out properly.
Developing FD-MT to investigate students’ mental model on fluid dynamic concept: a Rasch model analysis
Authors: Dewi F H , Samsudin A , Chandra D T 
Published: November 2021

Abstract
Fluid dynamics has some complex and unobservable concept, however, tests are rarely developed to measure students’ understanding of these concepts. This condtion make a difficulty to map students’ mental models with existing instruments. Based on that problem, this study aims to develop FD-MT (fluid dynamic-multi tier test) as a diagnostic test for measure students’ mental model on fluid dynamic concept. The ADDIE (Analyzing, Designing, Developing, Implementing, Evaluating) is a research method that used in this study. The data were collected by FD-MT will be analyzed by rasch model analysis, include the reliability, the validity, item fit and the differential item function. Student mental model clasified as Scientific, Synthesis-A (Sy-A), Synthesis-B(Sy-B), Syinthesis-C (Sy-C), Synthesis-D(Sy-D), and Initial. The participant of this study are 20 students in the eleventh grade (9 boys and 11 girls, 16-17 age in average) at high school in Bandung. Based on result study shows that students’ mental model mostly in mental Sc (8.18%), Sy-A (3.18%), Sy-B (21.36%), Sy-C (19.09%), Sy-D (38.18%) and In (10%), and incompleted answer (Nr = 0%). This conclude that, FD-MT is able to measureing students’ mental model on fluid dynamic concept.
The development of moodle based e-learning for newtons’ law in high school physics
Authors: Permana H , Andri B L , Muliyati D 
Published: November 2021

Abstract
Abstrak. This study aims to develop Moodle-Based E-Learning for Newton’s Laws in high school. The research method used is research and development (R&D) with the ADDIE approach. The e-learning was then assessed by media experts, material experts, and physics teachers. The instrument used is a Likert scale questionnaire. The developed model has a lot of interactions with the user as a student activity. The expert and user assessment show this Moodle-based e-learning for Newton’s Laws in high school is suitable for use in physics learning.
Uyo and nanu misconception investigation (UNAMI) on sound-light waves materials in North Sulawesi.
Authors: Umar F A , Samsudin A , Ramalis T R , Sa’diyah LH , Dalila A A , Komalasari K 
Published: November 2021

Abstract
Online learning amid the pandemic made students and teachers incapable to carry out face to face teaching and learning activities. This study aims to measure the state of the conception of students in Mongondow tribe with sound and light waves as material. The research method used descriptive quantitative method. The study was conducted on 67 students (22 male students called Uyo and 45 students who were usually called Nanu). Samples came from three Senior High School in Kotamobagu. The diagnosis of misconceptions was carried out using a four tiers diagnostic test instrument. The analysis in this study used the Rasch analysis. The results of the diagnosis appear that 16% of students in Senior High School in Kotamobagu have misconceptions on the material of sound and light waves especially on interference concept and characteristic sound wave, 39 % of students who get it partially negative understand the concept, only 15% of students who understand it, and 24% of students who don’t understand the concept. Based on this research, it is known that the level of misconceptions and partial negative understand of students is low and medium category.
What do physics teachers need? A need analysis of interactive multimedia to train creative thinking in static fluid
Authors: Susilowati N E , Samsudin A , Muslim  
Published: November 2021

Abstract
The purpose of this study was to analyze the needs of physics teachers in Lampung regarding interactive multimedia. Because many studies have proven the importance of using media in learning, it is necessary to conduct studies to reveal what media are needed to support static fluid learning according to the perceptions of physics teachers in Lampung. The analysis was carried out by providing a needs analysis questionnaire regarding learning media for static fluid material to 32 physics teachers in Lampung. Respondents were physics teachers with educational qualifications for Strata 1 and Strata 2, with 12 male respondents and 20 female respondents. Data presented in descriptive quantitative. Based on the results of the analysis, it is known that 88% of physics teachers need learning media that contains writing, pictures, animation, video, and audio to facilitate various learning styles and can train students’ creative thinking skills during online learning. Based on these findings, it is necessary to develop interactive multimedia to train creative thinking skill on static fluid topic.
Conceptions and troublesome knowledge on acid-base using the two-tier multiple-choice diagnostic test
Authors: Ardianti S , Wiji W , Widhiyanti T 
Published: November 2021

Abstract
Acid-base is one of the materials that tend to be difficult for students to understand. Acid-base is a material that is conceptually solid and requires an integrated understanding of many of the concepts of introductory chemistry. This research is descriptive research that aims to find conceptions of students on acid-base subjects and asking about concepts that are considered troublesome according to their learning experiences. The subjects of this research were 31 students of class XI IPA 4 at SMAN 3 Pariaman. The instruments in this research are diagnostic tests and interviews. The result of this research is the students of SMAN 3 Pariaman have difficulties in learning about the acid-base subject with high category. The percentage of conceptions experienced by students in each indicator is 56.3% of students understand the concept, 20.8% misconception, and 22.9% do not understand the concept. In the second indicator, 45.2% of students understood the concept, 18.3% had misconceptions and 36.5% did not understand the concept. In the 3rd indicator, 35.5% of students understood the concept, 31.2% had misconceptions and 33.3% did not understand the concept. In the 4th indicator, 21.9% of students understand the concept, 27.7% do not understand the concept and 50.3% do not understand the concept. Meanwhile, the acid-base theory, the calculation of pH or pOH, and the relationship between the degree of acidity (pH) and the degree of ionization (a), and the acid equilibrium constant (Ka) or the base equilibrium constant (Kb) are considered troublesome knowledge because they can be conceptually difficult.
Mathematical model of referral marketing strategy
Authors: Putra D P W , Rudhito M A 
Published: November 2021

Abstract
A marketing strategy is an attempt to campaign for a product so that information about the product becomes viral. Advertising strategy began to be combined by involving customers to campaign for the company’s products. This marketing strategy is known as the referral marketing strategy. Viral information in a community can be analogous to the pandemic condition of a disease. This study aims to examine the relationship between the epidemiological model and the marketing model with a referral strategy. This research is a literature study with the results of a marketing model design with a referral strategy. Based on the research, there are 4 groups in marketing modeling with a referral strategy, namely Unaware, Potential Broadcaster, Broadcaster, and Inert. The epidemiological model that is suitable for this condition is the SEIR model. Adjustments to the SEIR Model need to be made because the dynamics of the Unaware can go directly to the Inert because of the trust factor in marketing information. The simulation results show that the parameters that have an important role in making information viral are the customer network and the incubation time of the information becoming viral.
Fixed point theorem with contractive mapping on C*-Algebra valued G-Metric Space
Authors: Wijaya A , Hariadi N 
Published: November 2021

Abstract
Banach-Caccioppoli Fixed Point Theorem is an interesting theorem in metric space theory. This theorem states that if T : X → X is a contractive mapping on complete metric space, then T has a unique fixed point. In 2018, the notion of C
*-algebra valued G-metric space was introduced by Congcong Shen, Lining Jiang, and Zhenhua Ma. The C
*-algebra valued G-metric space is a generalization of the G-metric space and the C*-algebra valued metric space, meanwhile the G-metric space and the C
*-algebra valued metric space itself is a generalization of known metric space. The G-metric generalized the domain of metric from X × X into X × X × X, the C
*-algebra valued metric generalized the codomain from real number into C
*-algebra, and the C
*-algebra valued G-metric space generalized both the domain and the codomain. In C
*-algebra valued G-metric space, there is one theorem that is similar to the Banach-Caccioppoli Fixed Point Theorem, called by fixed point theorem with contractive mapping on C
*-algebra valued G-metric space. This theorem is already proven by Congcong Shen, Lining Jiang, Zhenhua Ma (2018). In this paper, we discuss another new proof of this theorem by using the metric function d(x, y) = max{G(x, x, y),G(y, x, x)}.
Characterisation of signal-induced noise in Hamamatsu R11265 Multianode Photomultiplier Tubes
Authors: Andreotti M. , Capelli S. , Cavallero G. , Chiozzi S. , Cotta Ramusino A. , D'Ambrosio C. , Fiorini M. , Franzoso E. , Frei C. , Gallorini S. , Gambetta S. , Giugliano C. , Gotti C. , Gys T. , Keizer F. , Maino M. , Malecki B. , Minzoni L. , Mitchell S. , Neri I. , Petrolini A. , Piedigrossi D. , Robertson G. , Sergi A. , Simi G. , Slazyk I. , Smith M. , Webster J. , Wotton S.A. 
Published: November 2021

Abstract
Signal-induced noise is observed in Hamamatsu R11265
Multianode Photomultiplier Tubes, manifesting up to several
microseconds after the single photoelectron response signal and
localised in specific anodes. The mean number of noise pulses varies
between devices, and shows significant dependence on the applied
high-voltage. The characterisation of this noise and the mitigation
strategies to perform optimal single-photon counting at 40 MHz, as
required by the LHCb Ring-Imaging Cherenkov detectors, are
reported.
Design a H-bridge low ripple and high bandwidth air core magnet corrector power supply in NSRRC
Authors: Wong Y.-S. , Huang J.-C. , Liu K.-B. , Liu C.-Y. , Wang B.-S. 
Published: November 2021

Abstract
This paper is the study of a low-current-ripple and
high-bandwidth corrector power supply. The main circuit of this
power supply is using a full bridge (H-bridge) structure, and the
output current through the high-precision direct current current
transducers (DCCT) to transfer the reference voltage to the
controller. Previous TPS corrector power supply had a 4.7 kHz
current bandwidth, and its output current ripple was
100 μA. Such current ripple and bandwidth do not satisfy the
requirements of a rapidly orbiting feedback system of air core
loading. Therefore, our research team designed a novel prototype
power supply with a high bandwidth (more than 10 kHz) and low
output current ripple (less than 10 μA) which was developed
via a novel topology circuit. The operation frequency of the main
power switch's n-type metal-oxide-semiconductor logic of this novel
circuit is increased to 245 kHz. Moreover, the output results of
the filter inductor and filter capacitor are modified to
80 μH and 2.46 μF, respectively. The prototype power
supply bandwidth reached 10.546 kHz and increase of 124% and its
output current ripple was lowered below than 5 μA. The
properties of this corrector power supply are very important for the
beam correction in storage rings. Finally, A circuit with an input
voltage of 48 V, a maximum output current of 10 A, and an output
power of 400 W is tested in a laboratory to verify the performance
of the developed corrector for the National Synchrotron Radiation
Research Center.
Linkages between GRACE water storage, hydrologic extremes, and climate teleconnections in major African aquifers
Authors: Scanlon Bridget R , Rateb Ashraf , Anyamba Assaf , Kebede Seifu , MacDonald Alan M , Shamsudduha Mohammad , Small Jennifer , Sun Alexander , Taylor Richard G , Xie Hua 
Published: November 2021

Abstract
Water resources management is a critical issue in Africa where many regions are subjected to sequential droughts and floods. The objective of our work was to assess spatiotemporal variability in water storage and related controls (climate, human intervention) in major African aquifers and consider approaches toward more sustainable development. Different approaches were used to track water storage, including GRACE/GRACE Follow On satellites for Total Water Storage (TWS); satellite altimetry for reservoir storage, MODIS satellites for vegetation indices, and limited ground-based monitoring. Results show that declining trends in TWS (60–73 km3 over the 18 yr GRACE record) were restricted to aquifers in northern Africa, controlled primarily by irrigation water use in the Nubian and NW Saharan aquifers. Rising TWS trends were found in aquifers in western Africa (23–49 km3), attributed to increased recharge from land use change and cropland expansion. Interannual variability dominated TWS variability in eastern and southern Africa, controlled primarily by climate extremes. Climate teleconnections, particularly El Nino Southern Oscillation and Indian Ocean Dipole, strongly controlled droughts and floods in eastern and southern Africa. Huge aquifer storage in northern Africa suggests that the recent decadal storage declines should not impact the regional aquifers but may affect local conditions. Increasing groundwater levels in western Africa will need to be managed because of locally rising groundwater flooding. More climate resilient water management can be accomplished in eastern and southern Africa by storing water from wet to dry climate cycles. Accessing the natural water storage provided by aquifers in Africa is the obvious way to manage the variability between droughts and floods.
Microplastics interact with benthic biostabilization processes
Authors: Hope J A , Coco G , Parsons D R , Thrush S F 
Published: November 2021

Abstract
Marine microplastics (MPs) accumulate in sediments but impacts on ecosystem functions are poorly understood. MPs interactions with stabilizing benthic flora/fauna or biostabilization processes, have not been fully investigated, yet this is critical for unraveling MPs effects on ecosystem-scale processes and functions. This is also vital for understanding feedback processes that may moderate the stock and flow of MPs as they are transported through estuaries. The relationships between sedimentary MPs, biota, environmental properties and sediment stability from field sediments, were examined using variance partitioning (VP) and correlation analyses. VP was used to identify common and unique contributions of different groups of variables (environmental, fauna and microplastic variables) to sediment stability. The influence of microplastic presence (fragment/fiber abundances and microplastic diversity) on sediment stability (defined using erosion thresholds and erosion rates) was demonstrated. Furthermore, MPs appeared to mediate the biostabilizing effects of environmental properties (including microorganisms) and fauna. Environmental properties and sediment stability could also explain the variation in MPs across sites suggesting biostabilizing properties may mediate the abundance, type and diversity of MPs that accumulate in the bed. The potential for MPs to influence biota and biostabilization processes and mediate microplastic resuspension dynamics within estuaries is discussed.