bluuebunny/crossref_metadata_2025_split huggingface dataset:
Rapid hamstrings to quadriceps ratio at long muscle lengths in professional football players with previous hamstring strain injury
Authors: Correia Paulo , Santos Paulo , Mil‐Homens Pedro , Gomes Miguel , Dias Amândio , Valamatos Maria João 
Published: January 2020

AbstractHamstring strain injuries (HSI) are the most common injury in male professional football and are potentially a primary risk factor to re‐injury. Although the isokinetic strength ratios have often been used to identify strength imbalances that can augment the risk of injury in football players, the rate of torque development hamstring to quadriceps ratio (RTD H/Q) has rarely been considered in previous reports. Furthermore, little consideration has been given to selective hamstring lengths (30° of knee flexion) and its influence on torque production. The aim of this study was to investigate the RTD H/Q at long hamstring lengths, conventional (concentric/concentric) and functional (eccentric/concentric) H/Q ratios in football players with and without previous HSI. Twenty‐four professional male football players (12 and 12 without previous HSI) performed maximal voluntary isometric contractions at long hamstring lengths (knee and hip flexed at 30° and 85°, respectively) and isokinetic concentric and eccentric contractions at 180°.s−1 and 60°.s−1. Conventional and functional H/Q ratios based on peak torque throughout the entire isokinetic range of motion and at long hamstring lengths were calculated. The RTD H/Q was extracted at long hamstring lengths in incrementing time periods of 50 milliseconds (ms) from the onset of contraction (50–250 ms). No significant differences were found between groups in any H/Q ratios studied. However, small effects (d = 0.4) were found in previously injured hamstrings to lower RTD H/Q at 50 ms and flexor eccentric torque. Previous HSI group showed small to moderate (0.4 > d < 0.6) higher RTD H/Q in late time intervals (>100 ms).
An inverse acoustic-elastic interaction problem with phased or phaseless far-field data
Authors: Dong Heping , Lai Jun , Li Peijun 
Published: January 2020

Abstract
Consider the scattering of a time-harmonic acoustic plane wave by a bounded elastic obstacle which is immersed in a homogeneous acoustic medium. This paper is concerned with an inverse acoustic-elastic interaction problem, which is to determine the location and shape of the elastic obstacle by using either the phased or phaseless far-field data. By introducing the Helmholtz decomposition, the model problem is reduced to a coupled boundary value problem of the Helmholtz equations. The jump relations are studied for the second derivatives of the single-layer potential in order to deduce the corresponding boundary integral equations. The well-posedness is discussed for the solution of the coupled boundary integral equations. An efficient and high order Nyström-type discretization method is proposed for the integral system. A numerical method of nonlinear integral equations is developed for the inverse problem. For the case of phaseless data, we show that the modulus of the far-field pattern is invariant under a translation of the obstacle. To break the translation invariance, an elastic reference ball technique is introduced. We prove that the inverse problem with phaseless far-field pattern has a unique solution under certain conditions. In addition, a numerical method of the reference ball technique based nonlinear integral equations is proposed for the phaseless inverse problem. Numerical experiments are presented to demonstrate the effectiveness and robustness of the proposed methods.
Possible quantized charge pump in bilayer and trilayer graphene
Authors: Wang Mei-Juan , Wang Jun , Liu Jun-Feng 
Published: January 2020

Abstract
We report a theoretic study of the two-parameter adiabatic charge pump based on the bilayer and trilayer graphene systems. The two perpendicular time-dependent electric fields with a phase lag between them are taken as the pumping potentials, which induce an instant energy gap in each pumping region. Based on both a continuum model and a lattice model, we show that the pumping results from the bilayer and trilayer graphene systems are very different when the Fermi energy happens to reside in the opened energy gap: there is no pumping current for the bilayer system whereas a quantized charge pumping effect emerges in the trilayer-graphene based pump device. This difference can be accounted for by the different Berry phases of Dirac electrons in the two systems. Our findings may shed a light on developing a quantized charge pumping device.
Fano resonance induced fast to slow light in a hybrid semiconductor quantum dot and metal nanoparticle system
Authors: Chen Hua-Jun 
Published: January 2020

Abstract
We theoretically demonstrate the Fano resonance and the conversion from fast to slow light in a hybrid semiconductor quantum dot (SQDs)-metal nanoparticle (MNPs) with cavity quantum electrodynamics treatment. The absorption spectra of the weak probe field exhibit a series of asymmetric Fano line shapes and their related optical propagation properties, such as fast and slow light effects, are investigated based on the hybrid system for suitable parametric regimes. Further, the transparency windows (i.e. the absorption dip approaches zero) in the probe absorption spectra are accompanied by the rapid steep dispersion of the Fano resonance profile, which promises the slow or fast light effect, and even tunable fast-to-slow light propagation (or vice versa) can be achieved by controlling different parameter regimes. Therefore the investigation may indicate promising applications in quantum information processing based on the hybrid SQD-MNP system.
The implementation of guided inquiry model on the subject matter harmonious vibration
Authors: Arifuddin M , Aslamiah M , Misbah M , Dewantara D 
Published: January 2020

AbstractThe low level of science process skills and scientific attitudes of students is because students are accustomed to getting information from teachers and learning that takes place only in one direction. Therefore, this study aims to improve students’ scientific attitudes and process skills through a guided inquiry model. The specific purpose of this study was to describe the implementation of lesson plans, science process skills, scientific attitudes, and learning outcomes of students. This study was a class action research model Kemmis and Mc Taggart consisting of 2 cycles. The subjects of this study were 34 students of class X-3 SMA Negeri 4 Banjarmasin. Data obtained through observation, tests, and documentation. The results showed: 1) the implementation of the lesson plan was categorized very well with a percentage of 90% and 96%; 2) students’ science process skills increase from an average score of 2.60 with a skilled category to 3.28 with a highly skilled category; 3) the scientific attitude of students also increased from an average score of 2.04 with a good category to 2.63 with a very good category; 4) student learning outcomes increase from classical completeness 50% to 85%. It was concluded that the science process skills and scientific attitudes of students increased after applied guided inquiry learning models on harmonious vibration material.
Higher-order thinking (HOT) oriented learning: exploration of mathematics teachers’ perception
Authors: Fajriah N , Sari A , Suryaningsih Y 
Published: January 2020

Abstract
Teacher is one of the factors of the success in implementing high-order thinking oriented learning so that students can think at a higher level. In fact, students’ high-order thinking skills are still low, so teachers’ perceptual information is needed. This study aims to describe the perception of mathematics teachers on HOT-oriented learning from the aspects of (1) curriculum, (2) books, (3) training, and (4) learning activities carried out. The research method used was a survey with a quantitative descriptive approach. The population of this study was 29 state junior high school mathematics teachers in North Banjarmasin Subdistrict. Data was collected through questionnaires and analyzed using a Likert scale, percentage, and mode. The results obtained showed that mathematics teachers had the following perceptions: (1) positive for the 2013 curriculum, (2) positive for books that were with HOT oriented but negative for examples in textbooks easily understood by students, (3) positive for training material that had been followed, (4) positive that planning is needed to construct HOT criteria, increase questioning activities, express opinions, foster creativity, and students’ critical thinking skills, but negatively increase the activity of observation, student experimentation, and scheduled timelines.
Critical thinking skill of prospective mathematics teachers in solving the two-dimensional geometry problem
Authors: Ansori H , Hidayanto T , Noorbaiti R 
Published: January 2020

Abstract
Critical thinking is one of the 21st-century skills that a person needs to have. However, the critical thinking skills of prospective mathematics teachers are relatively low. This study analyzed the critical thinking phase of prospective mathematics teachers in solving a two-dimensional geometry problem, i.e. problem analysis, exploration, drawing conclusions, clarification, and resolution phase. The subjects in this descriptive study were 35 prospective mathematics teachers. In the problem analysis phase, while some prospective mathematics teachers were able to identify what was known or asked in detail, some others were not. In the exploration phase, some prospective mathematics teachers presented ideas in solving problems in one way while others did it in various ways. The subject, who presented the idea of solving the problem in only one way, gave the final conclusion immediately. However, the subject that presented problem-solving in several ways and reviews from various perspectives can provide clarification of the problem and even convey resolution to the problem. This clarification and resolution arose because of cognitive conflicts that occur in the mind of the subject. Cognitive conflict arose because of the contradiction of the solutions to the problem when the subject used problem-solving from a different perspective.
Developing a computer simulation to minimize misconceptions in motion concept
Authors: Saehana S , Darsikin  , Haeruddin  , Kasim S 
Published: January 2020

Abstract
In this paper, we report the effort to minimize the students’ misconception in motion concept by developing a computer simulation. This research and development are applied with Borg and Gall methods. In developing a computer simulation, Forced Concept Inventory (FCI) with Certainty Responses Index (CRI) scale is used to detect misconceptions of the students.
The steps to develop a computer simulation are: (1) detecting misconception (pre-test), (2) designing and making a computer simulation, (3) validating simulation by an expert, (4) giving a chance to students on giving their opinion to a computer simulation, (5) trying the simulation in physics learning; the last step is (6) committing students’ conception test (post-test). Based on the FCI test, it was found that good conception of the students was 40%; less conception of the students was 20%; misconception of the students was 40%. According to our identification, the misconceptions were found in some motion concept i.e. linear motion, free fall, and parabolic motion. Then, a computer simulation was developing by designing it using Borland Delphi 7.0. After that, it was evaluated by material and media experts. The students gave their opinion about the computer simulation. Finally, a computer simulation was used in physics learning on the students of SMAN 2 Palu. It is found that students’ misconception is decreased about 25% after the computer simulation is applied.
Building students’ problem-solving skill in the concept of temperature and expansion through phenomenon-based experiential learning
Authors: Santhalia P W , Yuliati L , Wisodo H 
Published: January 2020

Abstract
This research is aimed to describe students’ problem-solving skill in phenomenon-based experiential learning especially in the subtopics of temperature and expansion. The problem-solving skill is one of the vital skills in physics learning that should be applied in measuring students’ understanding level. This research used a mixed-method approach with research design of an embedded experimental model for 32 eleventh graders of State Senior High Schools in Malang, East Java, Indonesia. The data were collected by pretest and posttest using tests and interview. The result shows that there is an improvement of students’ problem-solving skill after being taught by using phenomenon-based experiential learning. The calculation result of the N-Gain score showed the improvement of students’ problem-solving skill on a moderate category and the calculation result of d-Cohen effects size in on strong category. Meanwhile, the result of the qualitative calculation showed that students’ problem-solving skill is improved from beginner category to expert category that is 62.5%. The students’ problem-solving skill should be intensively trained by using contextual scientific problems in daily life.
The analysis of heat - temperature misconception and integration with Al Quran
Authors: Sofianto E W N , Irawati R K , Akmalia H A , Apriani R R 
Published: January 2020

Abstract
This research analyzed the misconception of heat and temperature material integrated with Al Quran on senior high school students in Banjarmasin. This research used qualitative method. Subjects of the research are student eleventh grade of science program in 16 senior high school of Banjarmasin. Every school was taken one class became subject of the research. This misconception has been analyzed using four tier test. Misconception that identified by four tier test and integrated with Al Quran on senior high school science students in Banjarmasin is the concept of heat transfer, changes in form, heat capacity, and expansion factor. Those concepts have been found not well understood among science students, especially on Black’s Principle, changes in form, and expansion factor.
Using three-tier diagnostic test to asses students’ misconception of simple harmonic oscillation
Authors: Susilowati E , Suyidno  , Mayasari T , Winarno N 
Published: January 2020

Abstract
This examination includes the advancement of a three-level analytic test to gauge understudies’ comprehension of simple harmonic oscillation. The Simple Harmonic Oscillation Test (SHOT) is a 10-items three-level demonstrative test comprising of three-level things for surveying understudies’ understanding of simple harmonic oscillation concepts. The SHOT was controlled to 50 understudies in the control class and 50 understudies in the experimental class. Cronbach alpha unwavering quality lists for the SHOT were assessed to be .73 and .85 for the control and experimental class, individually. Point-biserial coefficients went from .22 to .67, a normal of .42 for the control class and with a normal of .44 for experimental class. The results research showed that a three-tier diagnostic test able to reduce the misconception of simple harmonic oscillation. There is requirement for more investigations to create three-level tests in other branches of knowledge.
Anubias (Anubias sp.) propagation trough hydroponic culture technique
Authors: Sholichah L , Yamin M , Ginanjar R , Meilisza N 
Published: January 2020

Abstract
Anubias, water ornamental plants (Anubias sp) are exotic water ornamental plants from Africa that have a high economic value. Apart from its potential economic value, there are still many obstacles faced in the process of aquaculture. One of them is related to the propagation and a slow growth rate. This research was conducted to find the most suitable planting media for the propagation and growth of Anubias through hydroponic techniques. The hydroponic culture was carried out with four treatments in the form of planting media which consisted of: (1) husk charcoal; (2) sand (pasir Malang); (3) gravel; (4) Rockwool; all treatments were carried out by floating / NFT (nutrient film technic) technique. The design used in this study was a completely randomized design, where each treatment was given three replications. Parameters observed and measured included root length, plant height, number of leaves and number of new shoots. The sand as a planting media provides better growth when compared to the other three growing media.
An analysis of mathematical literacy of state junior high school students in Kupang
Authors: Fointuna D W , Kaluge A H , Fernandez A J 
Published: January 2020

AbstractThis survey was conducted to describe the mathematical literacy of state junior high school students in Kupang, East Nusa Tenggara province. Not only was it done due to the low performances of Indonesian 15-year-old students in PISA but also since there was not any research studies that had been done before to map the mathematical literacy of 15-year-old students in Kupang. This study used two-stage cluster randomized sampling to choose six-state junior high schools representing six sub-districts around Kupang. A total of 377 ninth-grade students were selected to become the respondents in this survey. They were tested using fifteen mathematical literacy problems directly adopted from PISA 2012 and some development researches items. The results showed that the mathematical literacy of state junior high school students in Kupang generally was in a low category. When we looked into three process domains as well as four content domains, the math literacy of students was also classified as either a low or a very-low-category. The results of this study can provide valid and actual data for society and the government regarding the math literacy of students in Kupang.
The effect of collaborative based science learning model on enhancing students’ critical thinking skills and responsibility
Authors: Isnawati  , Ibrahim M , Tjandrakirana  , Suyidno  , Rusmansyah  , Kusuma A E 
Published: January 2020

Abstract
The Collaborative Based Science Learning (CBSL) model was a learning model collaborative based science that integrates Critical Thinking Skills (CTS) and student responsibility. This study aims to analyze the effect of the CBSL model in enhancing the CTS and the responsibility of junior high school students. This study employed a quasi-experimental study with one group pre-test and post-test design. One hundred and seventy students of the eighth grade of Public Junior High School 6 Banjarmasin, Indonesia were involved and classified into five groups. The data was collected through the Critical Thinking Skills Test, a questionnaire on student responsibility, and an in-depth interview. The collected data were analyzed by using paired t-test / Wilcoxon test and n-gain. The results of the study in group-1, group-2, group-3, group-4, and group-5 indicate that the obtained of the sig. (2-tailed) CTS of students is 0.00 (p = < 0.05), and n-gain is 0.74-0.87, showing that it is significant in high criteria. In addition, the obtained sig. (2-tailed) student responsibility is 0.00 (p = <0.05) and n-gain is 0.55-0.67; showing significant result in the criteria of moderate. It is concluded that the CBSL model is effective. This study implies that the CBSL model can be used as an alternative to maximize students’ CTS and responsibility in science learning at schools as well as equip success in students’ life and future career.
The various type of microalgae in lentic habitats
Authors: Amintarti S , Utami N H , Ajizah A 
Published: January 2020

Abstract
Microalgae are unicellular algae living in freshwater. Algae were carbon fillers and biomass generators, so they have an important function to balance the environment. Lentic habitats can change rapidly, especially the existence of various activities such as sedimentation, pollution of various pollutants originating from domestic and industrial activities. This research aims to identify various types of microalgae in lentic habitats. Sampling was conducted at four-month intervals from April to June 2019. This zone divided into ponds and pools because it mostly used a water supply around the lentic area. The population in this research was microalgae in lentic habitats. From the results of the study that lentic habitats were found 4 divisions such Cyanophyta, Chlorophyta, Euglenophyta and Baccilariophyta, such Chlorella sp, Gloecapsa sp, Oscillatoria sp, Scenedesmus sp, Oedogonium sp, Microspora sp, Coleochaete sp, Closterium sp, Cymbella sp, Navicula sp, Pinnularia sp, Synedra sp, Euglena sp, Phacus sp, Trachelomonas sp. The microalgae were found on lentic habitat very affect by physical factors such as temperature, pH, and light intensity
The practicality of odonata handout in invertebrate zoology course
Authors: Riefani M K , Badruzsaufari  , Dharmono  
Published: January 2020

AbstractWetlands around the University of Lambung Mangkurat (ULM) Banjarmasin has been the habitat for dragonfly (Odonata). It has the potential to be utilized as a learning resource. A handout is one of the effective learning resources to achieve learning goals. Researchers created a handout to facilitate students to learn about the diversity and activities of Odonata at the wetlands around ULM Banjarmasin. This study aims to describe practicality of the Odonata handout. Research and development of handouts are based on Borg and Gall development model. This research was conducted in ULM Banjarmasin. The research subjects included three expert validation, nine students for small readability tests, and 18 students for small-scale field trials. Data analysis uses descriptive categorical techniques. The practicality of handout is indicated by students’ activity and students’ responses after they use handouts. The handouts based on students’ activity showed very high activity and showed a very strong positive response.
The needs analysis of basic physics learning devices based on hybrid learning
Authors: Ma’ruf M , Handayani Y , Marisda D H , Riskawati R 
Published: January 2020

Abstract
The research is a qualitative descriptive study as a preliminary study. The location of his research was at the department of physical education, University of Muhammadiyah Makassar. The purpose of his research is to analyze the level of needs of basic physics learning devices based on hybrid learning, and the research subjects consisted of 6 lecturers and 39 temporary students and had contracted basic physics courses at the Department of Physics Education at the University of Muhammadiyah Makassar. The technique of collecting data in the preliminary study activities was carried out through non-test instruments in the form of questionnaires, observations, and interviews. The data from the questionnaire were analyzed quantitatively based on the number of frequencies in the Likert scale category of each questionnaire item. The interview data and the results of the observations were analyzed descriptively qualitatively. Data analysis techniques used are observational data analyzed by making data percentage of the results of observations of each aspect measured, then the data is presented in the form of pie graphs. The results of the study show that the role of information and communication technology has not been maximized in basic physics learning effectively and efficiently for both lecturers and students, while the demands of 21st-century learning are expecting the role of ICT in learning especially by using hybrid learning.