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1
Putri, Ramadhanty Mashama, Eko Risdianto, and Nyoman Rohadi. "PENGEMBANGAN MEDIA PEMBELAJARAN INTERAKTIF DENGAN MENGGUNAKAN ADOBE CAPTIVATE PADA MATERI GERAK HARMONIK SEDERHANA." Jurnal Kumparan Fisika 2, no. 2 (September 2, 2019): 113–20. http://dx.doi.org/10.33369/jkf.2.2.113-120.
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Penelitian ini bertujuan untuk mengembangkan media pempelajaran interaktif dengan menggunakan Adobe Captivate pada materi gerak harmonik sederhana. Penelitian ini adalah penelitian pengembangan yang dilaksanakan dalam lima tahap yaitu, penentuan potensi dan masalah, studi literatur dan pengumpulan data informasi, desain produk, validasi desain dan desain teruji. Instrumen yang digunakan dalam penelitian ini yaitu lembar observasi, lembar angket guru dan siswa, lembar angket uji validasi tim ahli. Hasil penelitian ini menunjukkan bahwa media pembelajaran interaktif dengan menggunakan Adobe Captivate pada materi gerak harmonik sederhana yang dikembangkan termasuk dalam kategori sangat valid dengan persentase 81% yang memiliki reliabilitas tinggi dengan skor 0,86 pada aspek materi, 0,41 pada aspek bahasa dan 0,82 pada aspek media. Berdasarkan hasil dan pembahasan, maka dihasilkan suatu media pembelajaran interaktif dengan menggunakan Adobe Captivate pada materi gerak harmonik sederhana yang memiliki tanggapan yang positif oleh guru dan siswa yaitu dengan persentase 84 % dan 85 % dan layak untuk digunakan.Kata Kunci: Penelitian Pengembangan, Media, Adobe Captivate, Gerak Harmonik SederhanaThis study aims to develop an interactive learning media by using Adobe Captivate on simple harmonic motion. The research was development research carried out in five stages namely define potential and problems, study of literature and data collection of information, product design, validation of designs and proven designs. The instruments used in this research were observation sheets, teacher and student questionnaire sheets, questionnaires, validation tests, expert teams. The results of this research indicated that interactive learning media using Adobe Captivate in simple harmonic motion which developed was included in the very valid category with a percentage of 81% which have high reliability with a score of 0.86 in the material aspect, 0.41 in the aspect of language and 0, 82 on the media aspect. Based on the results and discussion, an interactive learning media was produced by using Adobe Captivate on simple harmonic motion material that had a positive response by teacher and students with a percentage of 84% and 85% and was feasible to use.Keywords: Research Development, Media, Adobe Captivate, Simple Harmonic Motion
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Yaqoob, Muhammad Tayyab, Mohd Khairil Rahmat, Siti Marwangi Mohamad Maharum, and Mazliham Mohd Su’ud. "A Review on harmonics elimination in real time for cascaded H-bridge multilevel inverter using particle swarm optimization." International Journal of Power Electronics and Drive Systems (IJPEDS) 12, no. 1 (March 1, 2021): 228. http://dx.doi.org/10.11591/ijpeds.v12.i1.pp228-240.
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Renewable energy has a great importance for power generation as it does not use the fossils fuels. Energy generated from alternative energy sources are weather dependent. To generate a continuous power to meet the load requirements, Battery energy storage system are used. Power conversion process must be much efficient as possible to convert the DC stored energy into AC. This conversion process is usually done by the help of inverters. This paper gives the brief overview on three main categories of multilevel inverter like cascaded h-bridge, neutral point clamped and flying capacitor multilevel inverter and highlights their advantages which can also help the scholars to deeply explore the categories of multilevel inverter. Harmonic elimination is usually done by controlling the switching angles of the inverter. Among all the switching angles techniques, selective harmonic elimination pulse width modulation (SHEPWM) technique is widely used, that has also discussed in this paper. Furthermore, to eliminate the harmonics using SHEPWM, it has the set of nonlinear transcendental equations, these set of equations can be effieceintly solved by the optimization methods. The most efficient and reliable optimization method like particle swarm optimization has been discussed with multiple objective functions in this paper. This paper will help the scholars to understand the finest category of multilevel inverter for harmonic elimination in terms of efficiency and output quality.
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Fariyani, Qisthi, and Hamdan Hadi Kusuma. "Development of Test Instruments to Analyze Higher-Order Thinking Skills Through Science-Based Literacy Learning." JIPF (Jurnal Ilmu Pendidikan Fisika) 6, no. 1 (January 4, 2021): 76. http://dx.doi.org/10.26737/jipf.v6i1.1886.
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Higher-order thinking skills are essential skills for a pre-service teacher to have. This study aims to develop the instrument and measure the higher-order thinking skills pre-service physics teacher UIN Walisongo Semarang with science literacy-based learning using the High Order Thinking Skills instrument. The data collection method used was a test, consisting of 20 selected questions with open reasons; structured interviews with lecturers and pre-service physics teachers; and documentation to collect pre-service physics teachers’ data required for research. The test instrument developed by reacherchers and validated by expert in the field of evaluation and physics. The instrument developed was in the form of questions grids, test questions, answer keys, scoring and assessment guidelines, and guidelines for the interpretation of high order thinking skills. The results of product development obtained 14 test items representing four indicators on Simple Harmonic Motion material. The results showed that the higher-order thinking skills of pre-service physics teachers were in the poor category, with an average percentage of 39%. The highest thinking skills are in the indicators determining the period and frequency of vibrations in simple harmonic motion that is in the good category with a percentage of 60.8%. The lowest thinking skills are on the indicator of analyzing energy in simple harmonic moving objects, which are in the inferior category with a percentage of 12.8%. The results of the research show that the higher-order thinking skills of pre-service physics teachers are still low, so that lecturers need to follow up to improve higher-order thinking skills of pre-service physics teachers UIN Walisongo Semarang.
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Zaenab, Siti, Muh Makhrus, and I. Wayan Gunada. "Analisis Tingkat Kemampuan Pemecahan Masalah Getaran Harmonis Melalui Model Pembelajaran Perubahan Konseptual." Jurnal Pendidikan Fisika dan Teknologi 5, no. 1 (May 13, 2019): 100. http://dx.doi.org/10.29303/jpft.v5i1.813.
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The study aims to analyze the problem-solving ability (PSA) of students during the learning process with conceptual change learning model. This research is included in quantitative descriptive research with three experimental classes. PSA at the time of learning is measured by an assessment instrument that refers to the problems in the LKPD and PSA evaluation sheet which contains two description questions at every meeting for four meetings. The assessment instrument refers to four PSA indicators, namely the ability to understand problems, plan solutions, carry out problem-solving, and check again, which is done during the learning process. Data analysis of PSA research results based on LKPD found that 58% of students have PSA in the very good category and 42% in the good category, while based on the evaluation results at each meeting it was found that 27% in the very good category, 62% in the good category, and 11% in the medium category. Analysis of research data shows that the conceptual change learning model is good to improve the problem-solving ability of harmonic motion of students of SMAN 8 Mataram.
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Malik, Adam, Yani Nuraeni, Achmad Samsudin, and Sutarno Sutarno. "Creative Thinking Skills of Students on Harmonic Vibration using Model Student Facilitator and Explaining (SFAE)." Jurnal Ilmiah Pendidikan Fisika Al-Biruni 8, no. 1 (April 29, 2019): 77–88. http://dx.doi.org/10.24042/jipfalbiruni.v8i1.3056.
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This study aims to determine the implementation of learning by applying the Student Facilitator And Explaining (SFAE) model and the improvement of students' creative thinking skills on the topic of harmonic vibration. The method used in this study is pre-experimental with one-group pretest-posttest design. The samples of this study were students of class X MIA 4 SMA Karya Pembangunan I Ciaparay with a total of 30 students. The sample was chosen by random sampling technique. The field observation sheet instrument was used to observe the implementation of the SFAE model. An essay type test was given in order to measure students' creative thinking skills. This study discovers that the average implementation score of teacher’s activity was 83% which belongs to the good category and the students’ activity was 79% which belongs to the good category. The Improvement of students’ creative thinking skills based on normalized gain was 0.56 which belongs to the medium category. Hypothesis testing used was paired sample t-test with the results of t-count (36.06)> t-table (2.052). This result means that the SFAE model can be used as an alternative for improving students' creative thinking skills for the topic of harmonic vibration. Thus, implementation of the SFAE model can improve students' higher order thinking skills. The SFAE model can also be implemented for learning on other physics topics at various levels of education
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Wachidatun Niklah, Dinni, Puji Hariati Winingsih, and Ayu Fitri Amalia. "Pengembangan Modul Praktikum Fisika Berbasis Open Ended Problem Pada Pokok Bahasan Getaran Harmonis." Kappa Journal 4, no. 2 (December 30, 2020): 256–62. http://dx.doi.org/10.29408/kpj.v4i2.2652.
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This study aims to develop and test the feasibility of physics practicum modules based on open ended problems on the subject of harmonic vibrations. This research type is research and development (R & D) by Sugiyono using 8 stages, namely potential and problems, data collection, product design, validation of practicum modules, improvement of practicum modules, practicum module trials, revision of practicum modules, and final products. The feasibility test for practicum module based on open ended problem uses a Likert scale questionnaire with validation by two validators. Research subjects MIPA MAN 5 Cirebon students, amounting to 9 students. The instrument used in the form of practical modules and questionnaire responses of students. The results of this research and development analysis were produced by practicum module products based on open ended problems on the subject of harmonic vibrations with an average validator score of 5.00 or (100%) with the Very Good (SB) category and the average score of students 4, 02 (80.40%) included in the Good category (B). So it can be concluded that the development of physics modules based on open ended problems is feasible to be used as practical teaching materials.
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Hadjiliadis, Olympia. "Optimality of the 2-CUSUM drift equalizer rules for detecting two-sided alternatives in the Brownian motion model." Journal of Applied Probability 42, no. 04 (December 2005): 1183–93. http://dx.doi.org/10.1017/s0021900200001194.
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This work employs the Brownian motion model in which observations are taken sequentially. The objective is to detect a two-sided change in the constant drift by means of a stopping rule. As a performance measure, an extended Lorden criterion is used. The goal is to minimize the worst-case detection delay subject to a constraint in the frequency of false alarms. In a companion paper, attention is drawn to a first category of 2-CUSUM rules for which the harmonic mean rule holds. It is further seen that a special class of 2-CUSUM stopping rules within this category, called drift equalizer rules, perform strictly better than non-equalizer rules, according to this specific performance measure.
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Mei, Chuh, K. Abdel-Motagaly, and R. Chen. "Review of Nonlinear Panel Flutter at Supersonic and Hypersonic Speeds." Applied Mechanics Reviews 52, no. 10 (October 1, 1999): 321–32. http://dx.doi.org/10.1115/1.3098919.
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A review of various analytical methods and experimental results of supersonic and hypersonic panel flutter is presented. The analytical methods are categorized into two main methods. The first category is the classical methods, which include Galerkin in conjunction with numerical integration, harmonic balance and perturbation methods. The second category is the finite element methods in either the frequency domain (eigensolution) or the time domain (numerical integration). A review of the experimental literature is given. The effects of different parameters on the flutter behavior are described. The parameters considered include inplane forces, thermal loading, flow direction, and initial curvature. Active control of composite panels at supersonic speeds and elevated temperatures is also considered. This review article cites 84 references.
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Hadjiliadis, Olympia. "Optimality of the 2-CUSUM drift equalizer rules for detecting two-sided alternatives in the Brownian motion model." Journal of Applied Probability 42, no. 4 (December 2005): 1183–93. http://dx.doi.org/10.1239/jap/1134587825.
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This work employs the Brownian motion model in which observations are taken sequentially. The objective is to detect a two-sided change in the constant drift by means of a stopping rule. As a performance measure, an extended Lorden criterion is used. The goal is to minimize the worst-case detection delay subject to a constraint in the frequency of false alarms. In a companion paper, attention is drawn to a first category of 2-CUSUM rules for which the harmonic mean rule holds. It is further seen that a special class of 2-CUSUM stopping rules within this category, called drift equalizer rules, perform strictly better than non-equalizer rules, according to this specific performance measure.
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Negro, M., M. Devetta, D. Faccialá, S. De Silvestri, C. Vozzi, and S. Stagira. "High-order harmonic spectroscopy for molecular imaging of polyatomic molecules." Faraday Discuss. 171 (2014): 133–43. http://dx.doi.org/10.1039/c4fd00033a.
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High-order harmonic generation is a powerful and sensitive tool for probing atomic and molecular structures, combining in the same measurement an unprecedented attosecond temporal resolution with a high spatial resolution of the order of an angstrom. Imaging of the outermost molecular orbital by high-order harmonic generation has been limited for a long time to very simple molecules, like nitrogen. Recently we demonstrated a technique that overcame several of the issues that have prevented the extension of molecular orbital tomography to more complex species, showing that molecular imaging can be applied to a triatomic molecule like carbon dioxide. Here we report on the application of such a technique to nitrous oxide (N2O) and acetylene (C2H2). This result represents a first step towards the imaging of fragile compounds, a category which includes most of the fundamental biological molecules.
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Rigatos, Gerasimos. "Feed-Forward Neural Networks Based on the Eigenstates of the Quantum Harmonic Oscillator." Journal of Advanced Computational Intelligence and Intelligent Informatics 10, no. 4 (July 20, 2006): 567–77. http://dx.doi.org/10.20965/jaciii.2006.p0567.
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The paper introduces feed-forward neural networks where the hidden units employ orthogonal Hermite polynomials for their activation functions. The proposed neural networks have some interesting properties: (i) the basis functions are invariant under the Fourier transform, subject only to a change of scale, (ii) the basis functions are the eigenstates of the quantum harmonic oscillator, and stem from the solution of Schrödinger’s diffusion equation. The proposed feed-forward neural networks belong to the general category of nonparametric estimators and can be used for function approximation, system modelling and image processing.
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Djukanovic, Gordana, and Marija Obradovic. "The pencil of the 4th and 3rd order surfaces obtained as a harmonic equivalent of the pencil of quadrics through a 4th order space curve of the 1st category." Facta universitatis - series: Architecture and Civil Engineering 10, no. 2 (2012): 193–207. http://dx.doi.org/10.2298/fuace1202193d.
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This paper shows the process of inverting the 4th ordered space curve of the first category with a self-intersecting point (with two planes of symmetry) and determining its harmonic equivalent. There are harmonic equivalents for five groups of surfaces obtained through the 4th order space curve of the 1st category. Mapping was done through a system of circular cross-sections. Both classical and relativistic geometry interpretations are presented. We also designed spatial models - a spatial model of the pencil of quadrics and a spatial model of the pencil of equivalent quadrics. Besides the boundary surfaces, one surface of the 3rd order, which is an equivalent to a triaxial ellipsoid, passes through this pencil of surface of the 4th order. The center of inversion is located on the contour of the ellipsoid. The parabolic cylinder is mapped into its equivalent, by mapping the contour parabola of the cylinder, in the frontal projection, in relation to the center and the sphere of inversion into a contour curve of the 4th order surface. The generating lines of the parabolic cylinder, which are in a projecting position and pass through the antipode, are mapped into circles (also in a projecting position) whose diameters are from the center of inversion to the contour line. The application of the 4th order surfaces in architectural practice is also presented.
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Du, Wenhua, Xiaoming Guo, Zhijian Wang, Junyuan Wang, Mingrang Yu, Chuanjiang Li, Guanjun Wang, et al. "A New Fuzzy Logic Classifier Based on Multiscale Permutation Entropy and Its Application in Bearing Fault Diagnosis." Entropy 22, no. 1 (December 24, 2019): 27. http://dx.doi.org/10.3390/e22010027.
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The self-organizing fuzzy (SOF) logic classifier is an efficient and non-parametric classifier. Its classification process is divided into an offline training stage, an online training stage, and a testing stage. Representative samples of different categories are obtained through the first two stages, and these representative samples are called prototypes. However, in the testing stage, the classification of testing samples is completely dependent on the prototype with the maximum similarity, without considering the influence of other prototypes on the classification decision of testing samples. Aiming at the testing stage, this paper proposed a new SOF classifier based on the harmonic mean difference (HMDSOF). In the testing stage of HMDSOF, firstly, each prototype was sorted in descending order according to the similarity between each prototype in the same category and the testing sample. Secondly, multiple local mean vectors of the prototypes after sorting were calculated. Finally, the testing sample was classified into the category with the smallest harmonic mean difference. Based on the above new method, in this paper, the multiscale permutation entropy (MPE) was used to extract fault features, linear discriminant analysis (LDA) was used to reduce the dimension of fault features, and the proposed HMDSOF was further used to classify the features. At the end of this paper, the proposed fault diagnosis method was applied to the diagnosis examples of two groups of different rolling bearings. The results verify the superiority and generalization of the proposed fault diagnosis method.
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LING, JUEN, I. PUTU EKA N. KENCANA, and TJOKORDA BAGUS OKA. "ANALISIS SENTIMEN MENGGUNAKAN METODE NAÏVE BAYES CLASSIFIER DENGAN SELEKSI FITUR CHI SQUARE." E-Jurnal Matematika 3, no. 3 (August 29, 2014): 92. http://dx.doi.org/10.24843/mtk.2014.v03.i03.p070.
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Sentiment analysis is the computational study of opinions, sentiments, and emotions expressed in texts. The basic task of sentiment analysis is to classify the polarity of the existing texts in documents, sentences, or opinions. Polarity has meaning if there is text in the document, sentence, or the opinion has a positive or negative aspect. In this study, classification of the polarity in sentiment analysis using machine learning techniques, that is Naïve Bayes classifier. Criteria for text classification decisions, learned automatically from learning the data. The need for manual classification is still required because training the data derived from manually labeling, the label (feature) refers to the process of adding a description of each data according to its category. In the process of labeling, feature selection is used and performed by chi-square feature selection, to reduce the disturbance (noise) in the classification. The results showed that the frequency of occurrences of the expected features in the true category and in the false category have an important role in the chi-square feature selection. Then classification breaking news by Naïve Bayes classifier obtained an accuracy of 83% and a harmonic average of 90.713%.
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Zahra, Ince Raudhiah, Benyamin Matius, and Abdul Hakim. "PENERAPAN MODEL PROBLEM BASED LEARNING UNTUK MENINGKATKAN KEMAMPUAN PEMECAHAN MASALAH SISWA SMA PADA MATERI GERAK HARMONIK SEDERHANA." Vidya Karya 33, no. 1 (October 2, 2018): 21. http://dx.doi.org/10.20527/jvk.v33i1.5389.
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Abstract. This study aims to determine the improvement of student’s problem solving skill after applying the problem based learning model and determine it’s effectiveness. This is a quantitative research with one group pretest-posttest design. Cluster random sampling was used, and 28 samples were obtained from one of high schools in Samarinda. The result of the analysis with Wilcoxon Signed Rank Test. The result showed that there’s a significant difference between students’ problem solving skill before and after the treatment, with the p-value 0,00 with significance 0,05. Generally, students’ problem solving skill increased from 8.5 to 29.5, with N-Gain of 0,2, which is classified as a low category. The highest gain was found in the ability of understanding the problem, with the N-Gain of 0,4, which is classified as a middle category. Meanwhile the indicator of students’ skill on planning problems, solving problems, and doing the re-check, were classified as low increasing category with N-Gain of 0,2. Based on calculation of effect size (d), which is 1,96 that is classified as a big category, the implementation of the treatment had a high effectiveness. Keywords : Problem Based Learning, Problem Solving Skill, Simple Harmonic MotionAbstrak. Penelitian ini bertujuan untuk mengetahui peningkatan kemampuan pemecahan masalah siswa setelah diterapkan model problem based learning dan mengetahui tingkat efektifitas dari penerapan model tersebut. Penelitian ini merupakan penelitian kuantitatif dengan desain one group pretest-posttest. Teknik pengambilan sampel yang digunakan adalah cluster random sampling, dengan sampel sebanyak 28 siswa dari salah satu sekolah SMA di Samarinda. Data dianalisis menggunakan Wilcoxon Signed Rank Test. Hasil penelitian menunjukkan bahwa terdapat perbedaan yang signifikan antara kemampuan pemecahan masalah siswa saat pretest dan posttest dengan perolehan p-value 0,00 dan signifikansi 0,05. Rata-rata kemampuan pemecahan masalah siswa mengalami kenaikan dari 8,5 menjadi 29,5 dengan N-Gain 0,2 yang termasuk dalam kategori rendah. Peningkatan tertinggi diperoleh indikator memahami masalah dengan N-Gain 0,4 yang termasuk dalam kategori sedang, sedangkan indikator kemampuan siswa merencanakan masalah, menyelesaikan masalah dan melakukan pengecekkan kembali termasuk dalam kategori rendah dengan N-Gain 0,2. Tingkat efektivitas yang diperoleh termasuk dalam kategori tinggi dengan nilai effect size (d) 1,96 yang termasuk dalam kategori besar.Kata Kunci : Problem Based Learning, Kemampuan Pemecahan Masalah, Gerak Harmonik Sederhana
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Zhang, PeiJin, Pietro Zucca, Sarrvesh Seethapuram Sridhar, ChuanBing Wang, Mario M. Bisi, Bartosz Dabrowski, Andrzej Krankowski, et al. "Interferometric imaging with LOFAR remote baselines of the fine structures of a solar type-IIIb radio burst." Astronomy & Astrophysics 639 (July 2020): A115. http://dx.doi.org/10.1051/0004-6361/202037733.
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Context. Solar radio bursts originate mainly from high energy electrons accelerated in solar eruptions like solar flares, jets, and coronal mass ejections. A sub-category of solar radio bursts with short time duration may be used as a proxy to understand wave generation and propagation within the corona. Aims. Complete case studies of the source size, position, and kinematics of short term bursts are very rare due to instrumental limitations. A comprehensive multi-frequency spectroscopic and imaging study was carried out of a clear example of a solar type IIIb-III pair. Methods. In this work, the source of the radio burst was imaged with the interferometric mode, using the remote baselines of the LOw Frequency ARray (LOFAR). A detailed analysis of the fine structures in the spectrum and of the radio source motion with imaging was conducted. Results. The study shows how the fundamental and harmonic components have a significantly different source motion. The apparent source of the fundamental emission at 26.56 MHz displaces away from the solar disk center at about four times the speed of light, while the apparent source of the harmonic emission at the same frequency shows a speed of < 0.02 c. The source size of the harmonic emission observed in this case is smaller than that in previous studies, indicating the importance of the use of remote baselines.
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Ma, Shichao, Xin Ning, Liang Wang, Wantao Jia, and Wei Xu. "Complex response analysis of a non-smooth oscillator under harmonic and random excitations." Applied Mathematics and Mechanics 42, no. 5 (May 2021): 641–48. http://dx.doi.org/10.1007/s10483-021-2731-5.
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AbstractIt is well-known that practical vibro-impact systems are often influenced by random perturbations and external excitation forces, making it challenging to carry out the research of this category of complex systems with non-smooth characteristics. To address this problem, by adequately utilizing the stochastic response analysis approach and performing the stochastic response for the considered non-smooth system with the external excitation force and white noise excitation, a modified conducting process has proposed. Taking the multiple nonlinear parameters, the non-smooth parameters, and the external excitation frequency into consideration, the steady-state stochastic P-bifurcation phenomena of an elastic impact oscillator are discussed. It can be found that the system parameters can make the system stability topology change. The effectiveness of the proposed method is verified and demonstrated by the Monte Carlo (MC) simulation. Consequently, the conclusions show that the process can be applied to stochastic non-autonomous and non-smooth systems.
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Hight, Christopher. "Stereo Types: The Operation of Sound in the Production of Racial Identity." Leonardo 36, no. 1 (February 2003): 13–17. http://dx.doi.org/10.1162/002409403321152220.
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Discussions of race and identity have often privileged the visual field and its representations as a site of cultural identity. In contrast, this paper examines how sound and its organization have been implicated in the constructions of “whiteness” as a normative category during the colonial epoch. Using a set of case studies, it examines the network formed between sound and vision through what the author calls a harmonic system of representation. After mapping this dominant system, the paper describes tactics that have been used to disrupt it. The possibility of heterogeneous subjectivity, often called the cyborg, is explored as an alternative, in relation to different organizations of sound.
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Tumanggor, Awal Mulia Rejeki, Supahar Supahar, Ernila Siringo Ringo, and Muhammad Dika Harliadi. "Detecting Students’ Misconception in Simple Harmonic Motion Concepts Using Four-Tier Diagnostic Test Instruments." Jurnal Ilmiah Pendidikan Fisika Al-Biruni 9, no. 1 (April 30, 2020): 21–31. http://dx.doi.org/10.24042/jipfalbiruni.v9i1.4571.
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This research aims to develop the test instrument that is feasible in terms of validity, reliability, and difficulty level and to identify students' misconceptions in simple harmonic motion concepts. The development stages used in this research were the modifications result from Oriondo Dalo-Antonio, which included: (1) planning and design development, (2) trying out, and (3) measurement and interpretation of results. The instrument has been developed and categorized as effective because it is declared valid and reliable based on the criteria of the lowest and highest limit of the INFIT MNSQ which is 0.77 and 1.30, all test items are fitted with the PCM model, and the instrument's reliability has an item reliability value of 0.73 with a good category. The test instrument was applied to 60 students of the tenth-grade of senior high school. Based on the results, the four-tier test instrument developed was able to identify students' conceptual understanding of 36.4%, and 17.7% of students only understood parts of concepts, 40.7% of students experienced misconceptions, and 5.2% of students did not know the concept. The biggest misconception occurred in the subtopic frequency of simple harmonic motion by 75%, the relationship of the rope length with the pendulum vibration period by 60%, and 58.3% about the relationship between the total spring constant and the spring frequency. The instrument developed in this research was able to detect students' misconceptions, especially student learning experiences about simple harmonic motion
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Dawe, Lloyd A., John R. Plait, and Ronald J. Racine. "Inference of Metrical Structure from Perception of Iterative Pulses within Time Spans Defined by Chord Changes." Music Perception 12, no. 1 (1994): 57–76. http://dx.doi.org/10.2307/40285755.
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In many theories of meter inference (e. g., Benjamin, 1984; Lerdahl & Jackendoff, 1983), the cues that serve as markers for major metrical accent locations are the basis from which one infers or determines a meter. However, phrase and metrical structure often support one another with phrase boundaries coinciding with metrically important locations. Thus, it becomes difficult to determine which cues, if any, are used predominantly as the basis for meter inference. Three experiments are presented in which different time spans defined by harmonic, melodic, and temporal accents, and their coincidences were systematically pitted against one another. Musicians and nonmusicians were requested to identify the meter of the stimuli as belonging to a category of either a triple (e. g., 6/8 or 3/4 time), or a duple meter (e. g., 2/4 or 4/4 time). It was found that musicians use harmonic information much more often and reliably than do nonmusicians, who also use the temporal accent to define a metrical structure. Nevertheless, across all experiments, when a harmonic accent was present, subjects used that accent to define the meter. Furthermore, the coincidence of melodic accents was used more often than a temporal accent to determine a metrical structure. The implications of these findings in light of other research that shows that a temporal accent is heard as initiating major metrical locations (Lerdahl & Jackendoff, 1983; Longuet-Higgins & Lee, 1982, 1984; Longuet-Higgins & Steedman, 1971; Steedman, 1977) are discussed.
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Collin, Adam J., Sasa Z. Djokic, Jiri Drapela, Zekun Guo, Roberto Langella, Alfredo Testa, and Neville R. Watson. "Analysis of Approaches for Modeling the Low Frequency Emission of LED Lamps." Energies 13, no. 7 (March 31, 2020): 1571. http://dx.doi.org/10.3390/en13071571.
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Light emitting diode (LED) lamps are now an established lighting technology, which is becoming prevalent in all load sectors. However, LED lamps are non-linear electrical loads, and their impact on distribution system voltage quality must be evaluated. This paper provides a detailed analysis of time domain and frequency domain approaches for developing and evaluating models suitable for use in large scale steady-state harmonic power flow analysis of the low frequency (LF) emission of LED lamps. The considered approaches are illustrated using four general categories of LED lamps, which have been shown to cover the vast majority of LED lamps currently available on the market. The aim is an in-depth assessment of the ability of commonly applied models to represent the specific design characteristics of different categories of LED lamps. The accuracy of the models is quantitatively evaluated by means of laboratory tests, numerical simulations, and statistical analyses. This provides an example, for each LED lamp category, of comprehensive information about the overall accuracy that can be achieved in the general framework of large scale LF harmonic penetration studies, particularly in the assessment of voltage quality in low voltage networks and their future evolution.
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Ogg, Mattson, Thomas A. Carlson, and L. Robert Slevc. "The Rapid Emergence of Auditory Object Representations in Cortex Reflect Central Acoustic Attributes." Journal of Cognitive Neuroscience 32, no. 1 (January 2020): 111–23. http://dx.doi.org/10.1162/jocn_a_01472.
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Human listeners are bombarded by acoustic information that the brain rapidly organizes into coherent percepts of objects and events in the environment, which aids speech and music perception. The efficiency of auditory object recognition belies the critical constraint that acoustic stimuli necessarily require time to unfold. Using magnetoencephalography, we studied the time course of the neural processes that transform dynamic acoustic information into auditory object representations. Participants listened to a diverse set of 36 tokens comprising everyday sounds from a typical human environment. Multivariate pattern analysis was used to decode the sound tokens from the magnetoencephalographic recordings. We show that sound tokens can be decoded from brain activity beginning 90 msec after stimulus onset with peak decoding performance occurring at 155 msec poststimulus onset. Decoding performance was primarily driven by differences between category representations (e.g., environmental vs. instrument sounds), although within-category decoding was better than chance. Representational similarity analysis revealed that these emerging neural representations were related to harmonic and spectrotemporal differences among the stimuli, which correspond to canonical acoustic features processed by the auditory pathway. Our findings begin to link the processing of physical sound properties with the perception of auditory objects and events in cortex.
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Moreno-Pulido, Soledad, Francisco Javier García-Pacheco, Alberto Sánchez-Alzola, and Alejandro Rincón-Casado. "Convergence Analysis of the Straightforward Expansion Perturbation Method for Weakly Nonlinear Vibrations." Mathematics 9, no. 9 (May 3, 2021): 1036. http://dx.doi.org/10.3390/math9091036.
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There are typically several perturbation methods for approaching the solution of weakly nonlinear vibrations (where the nonlinear terms are “small” compared to the linear ones): the Method of Strained Parameters, the Naive Singular Perturbation Method, the Method of Multiple Scales, the Method of Harmonic Balance and the Method of Averaging. The Straightforward Expansion Perturbation Method (SEPM) applied to weakly nonlinear vibrations does not usually yield to correct solutions. In this manuscript, we provide mathematical proof of the inaccuracy of the SEPM in general cases. Nevertheless, we also provide a sufficient condition for the SEPM to be successfully applied to weakly nonlinear vibrations. This mathematical formalism is written in the syntax of the first-order formal language of Set Theory under the methodology framework provided by the Category Theory.
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Grinbaum, Oleg. "Issues of Verse Theory: Aesthetic Categories and the Poetic Text." Respectus Philologicus 25, no. 30 (April 25, 2014): 118–39. http://dx.doi.org/10.15388/respectus.2014.25.30.9.
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This article discusses issues of verse theory as it relates to the stanza as a structural unit of a poetic text. The basic aesthetic categories (limits, harmony, grace, and beauty) are considered from the position of mathematical aesthetics, and a mathematical interpretation is offered for three of them (limits, harmony, and grace) in respect to the poetic text (stanza). The category “beauty” cannot correlate with formal descriptions, as far as beauty is the highest subjective-qualitative assessment of an observed object and formed on the basis of a quantitative-qualitative assessment of its limits, harmony, and grace. From the standpoint of aesthetic science, a verse represents the motion limits of a poetic thought. For the mathematical two new formal parameters are introduced, namely the “harmony” and “grace” of the poetic rhythm. In fact, these formal parameters are indicative correlates of expressive (sensual-meaningful) possibilities and kinds of artistic and poetic form (stanzas). In the network of mathematical aesthetics, new parameters acquire clear and mathematically precise definitions and computational procedures that make it possible to quantitatively assess the harmonic potential of different stanzas in their structural-systemic representation. The concept of a stanza’s harmonic profile is introduced, which allows very subtle differences to be captured in the aesthetic properties of different stanzas of Russian classical verse. The employment of new parameters is demonstrated through examples of the most productive of Pushkin’s stanzas.
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Yu, Zhi Fei, Bing Li, Wei Wang, and Shi Bao Qian. "Fast True RMS Algorithm Using in the High-Voltage General Inverter." Advanced Materials Research 614-615 (December 2012): 1244–49. http://dx.doi.org/10.4028/www.scientific.net/amr.614-615.1244.
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The high-voltage general inverter which has the advantage of the structure， has become the key equipment to saving energy in recent years. The inverter output current is the key variable of overload protection, over current protection and V/F control compensation, so the real-time accurate measurement of its RMS is extremely important. In this paper, the output current signals preprocess by hardware filter firstly, and then find the RMS of the current signal in the period of the waveform. Meanwhile, this algorithm belong to true RMS algorithm category, which suitable for testing harmonic current signal, and can avoid mean filter to reduce the computation time. By using this algorithm, the inverter control system provides accurate reference for overload protection reduces the systematic disoperation rate and sets the more accurate security allowance to ensure the safe operation of equipment.
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Mani, A., K. Rajesh, and P. Praveen Kumar. "Crystal Growth, Optical, Dielectric, Thermal, Mechanical, Laser Damage Threshold and Second Harmonic Generation Characterization of Bis 2,5-Dimethylanilinium Sulfate Single Crystal." Advanced Science Letters 24, no. 8 (August 1, 2018): 5785–89. http://dx.doi.org/10.1166/asl.2018.12196.
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Single crystals of bis 2,5-dimethylanilinium sulfate (bis 2,5-DAS) were grown by slow evaporation solution growth technique at room temperature. The crystalline nature of the grown crystal was confirmed by the single crystal X-ray data. Bis 2,5-DAS crystal was found to crystallize in monoclinic system with non-centrosymmetric space group Cc. The various functional groups presented in the crystal were confirmed by FT-IR spectroscopic studies. Optical transmittance of the grown crystal was studied by UV–Vis–NIR spectroscopy. The dielectric loss and dielectric constant measurement as a frequency and temperature were measured on bis 2,5-DAS single crystal. The thermal stability and decomposition stages of the grown crystal were studied by TG-DTA analysis. Microhardness measurements revealed that bis 2,5-DAS belongs to a soft material category. Laser damage threshold studies were carried out for the grown crystal. The second harmonic generation of the crystal was confirmed and the efficiency was measured using Kurtz Perry powder method.
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BRAAE, NICK. "Sonic Patterns and Compositional Strategies in Queen's ‘Bohemian Rhapsody’." Twentieth-Century Music 12, no. 2 (August 26, 2015): 173–96. http://dx.doi.org/10.1017/s147857221500002x.
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AbstractQueen's ‘Bohemian Rhapsody’ (1975) has been the subject of many academic analyses; the song has not been considered, however, in the context of Queen's wider output. This article examines ‘Bohemian Rhapsody’ in relation to Queen's idiolect as identified from the group's songs written between 1973 and 1975. ‘Idiolect’ refers to the common musical details of an artist's output or segment of their output. I subdivide the category of an idiolect to include sonic patterns and compositional strategies. The former accounts for patterns that are consistent in their presentation across songs, the latter accounts for patterns that differ in their presentation across songs. The formal and harmonic structures of ‘Bohemian Rhapsody’ reflect the group's common compositional strategies; the song's textural arrangements highlight Queen's sonic patterns. ‘Bohemian Rhapsody’ occupies a unique place in Queen's output, as the first song to present all the major elements of the group's idiolect.
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Venkatesan, A., S. Arulmani, E. Chinnasamy, S. Senthil, and M. E. Raja Saravanan. "Growth, Experimental Studies and DFT Calculations on Gallic acid 5-Nitrouracilate Single Crystals for Non-linear Optical Applications." Asian Journal of Chemistry 33, no. 5 (2021): 1085–89. http://dx.doi.org/10.14233/ajchem.2021.23130.
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The growth and characterization of gallic acid 5-nitrouracilate (GA5NU) single crystals were grown using slow evaporation solution growth technique at room temperature. Single crystal XRD analysis revealed that the grown crystal belongs to monoclinic crystal system. HOMO-LUMO and molecular electrostatic potential (MEP) has been visualized and analyzed. The presence of various functional groups present in the host material was examined using FTIR spectra. Mechanical stability of the grown crystal is validated using Vickers microhardness study and the grown crystal belongs to soft material category. Various hardness parameters like fracture toughness, brittleness index, elastic stiffness constant, tensile strength and other hardness parameters were also calculated. Thermal stability of the grown crystal was also determined. The second harmonic generation (SHG) efficacy of grown crystal was 2.97 times higher than potassium dihydrogen phosphate (KDP), which makes the grown crystal as suitable candidate material for non-linear optical applications.
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Ilyas, Ilyas, and An Nisaa Al Mumin Liu. "The Effect of Based E-learning Contextual Approach on Student Learning Motivation." Jurnal Penelitian Pendidikan IPA 6, no. 2 (June 29, 2020): 184. http://dx.doi.org/10.29303/jppipa.v6i2.425.
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One of the fundamental problems for students is the low motivation to learn. The reason is the learning approach used by lecturers in the classroom is less attractive. Therefore this study about the use of contextual approaches based on e-learning to help student motivation. This type of research is quantitative research, with descriptive statistical analysis and inferential statistics to describe motivation data for learning simple harmonic wave material Students of Physics Education Study Program at University of Flores use a contextual approach based on e-learning. Data collection techniques used in this study were non-test techniques. From the results of descriptive analysis shows that the average student learning motivation is 78.90 in the sufficient category. While the results of inferential statistics show the t value of 5.453, sig (2-tailed) 0.000. Because the sig (2-tailed) value of 0,000 is smaller than 0.05, this shows that the contextual approach based on e-learning (Zoom Cloud Meeting) influences student learning motivation
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Naz, Rehana, Igor Leite Freire, and Imran Naeem. "Comparison of Different Approaches to Construct First Integrals for Ordinary Differential Equations." Abstract and Applied Analysis 2014 (2014): 1–15. http://dx.doi.org/10.1155/2014/978636.
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Different approaches to construct first integrals for ordinary differential equations and systems of ordinary differential equations are studied here. These approaches can be grouped into three categories: direct methods, Lagrangian or partial Lagrangian formulations, and characteristic (multipliers) approaches. The direct method and symmetry conditions on the first integrals correspond to first category. The Lagrangian and partial Lagrangian include three approaches: Noether’s theorem, the partial Noether approach, and the Noether approach for the equation and its adjoint as a system. The characteristic method, the multiplier approaches, and the direct construction formula approach require the integrating factors or characteristics or multipliers. The Hamiltonian version of Noether’s theorem is presented to derive first integrals. We apply these different approaches to derive the first integrals of the harmonic oscillator equation. We also study first integrals for some physical models. The first integrals for nonlinear jerk equation and the free oscillations of a two-degree-of-freedom gyroscopic system with quadratic nonlinearities are derived. Moreover, solutions via first integrals are also constructed.
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van Kampen, Jacqueline. "Afrikaans directionality switch in ‘triple’ V-clusters with the auxiliary het." Linguistics in the Netherlands 34 (November 23, 2017): 77–91. http://dx.doi.org/10.1075/avt.34.06van.
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Abstract The general perspective of the paper is that all (dis)harmonic branching orders within the West-Germanic V-clusters imply a different categorization by the acquisition procedure that should be independently motivated. More specific, the paper discusses the directionality switch with the temporal auxiliary het (‘have’) in Afrikaans. Afrikaans has a right-branching V-cluster 1-2-3. The directionality switches in subordinate clauses when V1 is the auxiliary het, which seemingly gives rise to the a-typical order 2-3-1 [[leer 2 swem 3] het 1]. V2 is in this case an IPP (Infinitivus-pro-participio) infinitive. I propose to derive the directionality switch as a matter of category assignment by an acquisition procedure that is unaware of underlying structure followed by movements. I argue that sentence-final het has been reanalyzed as a morphological suffix on the V3. This leads to a simplification of the apparent 2-3-1 V-cluster into a binary 1–2 V-cluster [leer 1 [swem het]2].
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Hubinský, Peter, and Peter Häuptle. "Reducing Oscillations During Positioning of A Servomechanism Having Flexibility." Journal of Electrical Engineering 63, no. 4 (July 1, 2012): 201–12. http://dx.doi.org/10.2478/v10187-012-0030-x.
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Reducing Oscillations During Positioning of A Servomechanism Having FlexibilityThis contribution describes the method of harmonic modulation of a velocity set-point signal in control to reduce undesirable oscillations. Especially the combination of this method with the well known input shaping method is of interest. Such a solution seeks for instance to a control structure used for servomechanisms equipped with a gear-box or namely mechatronic drives (MDs); where undesirable oscillations in transient- as well as semi-steady-states could arise. The combination of the methods has been proofed under real conditions in an experimental setup. Based on this, simulations regarding different industry demands and the proper choice of the modulation signal types will be introduced. Further it will be discussed which modulation signal should be used for the correspondingieindustrial demands. Both proposed methods are in the category of feed-forward-control which led to a practical implementation where no additional sensor (for measuring these undesirable effects) is needed to improve the system dynamics.
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Oktaviana, Melva, Desy Hanisa Putri, and Eko Risdianto. "PENGEMBANGAN MODUL ELEKTRONIK BERBANTUAN SIMULASI PhET PADA POKOK BAHASAN GERAK HARMONIK SEDERHANA DI SMA." Jurnal Kumparan Fisika 3, no. 2 (August 30, 2020): 131–40. http://dx.doi.org/10.33369/jkf.3.2.131-140.
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ABSTRAK Penelitian ini merupakan R&D level 1 yang dilaksanakan dalam lima tahap yaitu potensi masalah, studi literatur dan pengumpulan informasi, desain produk, validasi desain dan desain teruji. Tujuan dari penelitian dan pengembangan ini yaitu: 1) mengidentifikasi tingkat kebutuhan bahan ajar E-Modul dan media pembelajaran dan 2) mengembangkan modul pembelajaran elektronik berbantuan simulasi PhET pada pokok bahasan gerak harmonik sederhana di SMA. Instrumen yang digunakan dalam penelitian ini yaitu lembar observasi, lembar angket siswa dan guru, dan lembar angket uji validitas oleh tim ahli. Hasil dari penelitian ini menunjukkan bahwa, modul pembelajaran elektronik berbantuan simulasi PhET yang dikembangkan berada dalam kategori sangat valid dan merupakan desain teruji dengan perolehan skor pada aspek materi yaitu 92,3%, aspek bahasa yaitu 91,7% dan aspek media yaitu 94,2%, serta didapatlah perolehan skor persentase total rata-rata modul pembelajaran elektronik ini yaitu 92,7%. Berdasarkan hasil dengan penambahan daftar isi, sajian isi modul, petunjuk penggunaan modul, tujuan pembelajaran, materi, contoh soal, lembar kerja siswa dengan bantuan simulasi PhET, latihan soal dan kunci jawaban soal, kemudian terdapat gambar, video, simulasi serta animasi yang menarik maka dihasilkan modul elektronik berbantuan simulasi PhET pada pokok bahasan gerak harmonik sederhana di SMA. Kata Kunci: Bahan ajar fisika, modul elektronik, simulasi PhET, penelitian dan pengembangan ABSTRACT This research was level 1 R & D which was carried out in five stages, namely potential problems, literature studies and information gathering, product design, validated design and design. The objectives of this research and development were: 1) identifying the level of need for E-Module teaching materials and learning media and 2) developing electronic learning modules assisted by PhET simulation on the subject of simple harmonic motion in high school. The instruments used in this study were observation sheets, student and teacher questionnaire sheets, and questionnaire validity test sheets by the expert team. The results of this study indicated that the teaching materials used at the Bengkulu City Senior High School in the form of printed teaching materials and that were obtained from schools, then there was a lack of use of ICT-based learning media. Furthermore, the PhET simulation assisted electronic learning module developed was in a very valid category and is a tested design with the acquisition of scores on material aspects namely 92.3%, language aspects namely 91.7% and media aspects namely 94.2%, and obtained the percentage score for the total average of this electronic learning module is 92.7%. Based on the results of adding the table of contents, presenting module contents, module usage instructions, learning objectives, material, sample questions, student worksheets with the help of PhET simulations, practice questions and answer key questions, then there are interesting images, videos, simulations and animations then generated electronic module with PhET simulation on the subject of simple harmonic motion in high school. Keywords: Physics teaching materials, electronic modules, PhET simulations, research and development
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Abritsova, M. V. "Possibilities of minimally invasive treatments of hemorrhoidal disease." Ambulatory surgery: hospital-replacing technologies, no. 3-4 (December 4, 2018): 77–82. http://dx.doi.org/10.21518/1995-1477-2018-3-4-77-82.
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The article presents the results of surgical treatment of patients with stages III to IV hemorrhoids followed by an observation period of 45 days, which is designed to improve the results of surgical treatment of this category of patients. The surgical treatment methods included doppler-guided transanal hemorrhoiddearterialization with mucopexy (DDM) (Group I) and harmonic scalpel hemorrhoidectomy (HSH) (Group II). Operated patients underwent all necessary examinations according to the “per protocol” principle. Study Design: single-center controlled randomized prospective. The effectiveness of DDM was comparable to that of hemorrhoidectomy (HE), which made it possible to significantly reduce the duration of the operation (DDM 17.9 ± 6.1 min, GE 34.5 ± 10.1 min (p <0.01) ), reduce the level of pain in the postoperative period (DDM an average of 2.5 points, HE 4.8 points (p <0.01)), reduce the frequency of narcotic analgesics (DDM an average of 1.3 doses, HE an average of 6.1 doses (p <0.01)) and shorten the period of disability (DDM 14.4 ± 5.2 days, HE 30.3 ± 5.4 days (p <0.01)) patients with stages III to IV disease.
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Mufida, Husna Noor, Suharto Linuwih, and Sugianto Sugianto. "Descriptive Analysis of Student’s Self Efficacy in The Discovery Learning Processes." Physics Communication 3, no. 1 (October 26, 2018): 41–46. http://dx.doi.org/10.15294/physcomm.v3i1.14990.
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This research aims to describe the state of self efficacy on the application of learning discovery learning model on harmonic vibration topic. In addition to reveal the factors that influence the increase or decrease of students' self efficacy with the application of discovery learning model. This research is a qualitative descriptive analysis research. Discovery learning model is implemented in 38 students class X MIPA 2 of SMA 1 Bae Kudus. Data collection was done by giving questionnaires, observation, and interview. Questionnaire of student’s self efficacy also has been given to determine the condition of self efficacy of students before and after the learning process implemented. The results showed that the initial self efficacy condition of students who had low initial increase although not significant. The condition of early efficacy of students before the learning process determines the level of student success in the learning process. Analysis of the first time self efficacy of students with the low category can be used as an anticipation or prevent the final learning outcomes of students do not become low.
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Vetrivel, S., R. U. Mullai, K. Kanagasabapathy, R. Aruljothi, and V. Praveenkumar. "Growth and Characterization of a Nonlinear Optical Single Crystal: Bis(4-nitrobenzoate) Tetraaquamanganese (II) Dihydrate (BNMD)." Journal of Advanced Physics 6, no. 1 (March 1, 2017): 62–68. http://dx.doi.org/10.1166/jap.2017.1282.
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Semiorganic optically transparent Bis(4-nitrobenzoate) tetraaquamanganese (II) dihydrate [Mn (p-NO2C6H4COO)2 (H2O)4]·2H2O (BNMD) single crystals were grown by slow evaporation technique at room temperature. Single crystal X-ray diffraction analysis was carried out to determine the lattice parameters of the crystal. Powder X-ray diffraction pattern was recorded and indexed for the structural confirmation. The crystalline quality was confirmed by HRXRD. The presence of functional group in the compound has been confirmed by FTIR analysis. UV-Visible transmission spectrum has been recorded to determine the cut-off wavelength region of the crystal. The Second Harmonic Generation of BNMD crystal was confirmed by Kurtz-Perry powder method using Nd:YAG laser and found to be 0.59 times that of KDP. The dielectric response of the crystal was also investigated and reported. The microhardness study reveals that the hardness number (Hv) increases with load. From the values of work hardening coefficients, it was concluded that BNMD crystal belong to the category of soft materials. Thermal studies were performed using differential thermal analysis (DTA).
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Kanagasabapathy, K., and R. Rajasekaran. "Growth, Spectral, Optical and Thermal Studies of Rare Earth Neodymium(III)Nitrate Doped Tris Thiourea Zinc(II)Sulphate Single Crystals." Advanced Materials Research 584 (October 2012): 37–41. http://dx.doi.org/10.4028/www.scientific.net/amr.584.37.
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Tristhiourea Zinc(II)sulphate (ZTS) and rare earth Neodymium(III)Nitrate doped Tristhiourea Zinc(II)sulphate compounds were synthesized and single crystals were grown from aqueous solution by slow evaporation technique. The cell parameters of the grown crystals were evaluated by single crystal X-ray diffraction studies and powder X-ray diffraction analysis further confirmed the crystalline nature of the grown crystals. The presence of functional groups in the grown crystals was confirmed by FTIR analysis. UV-Visible absorption spectra reveal the cutoff wavelengths of grown crystals. TGA/DTA thermal analyses revealed that the materials have good thermal stability. The incorporation of the impurity (Nd3+) entered into ZTS crystals was confirmed by SEM-EDX analysis. The microhardness studies on the grown crystal samples revealed that the hardness increases with applied load for all the grown crystals. From the values of work hardening coefficient, ZTS and Neodymium(III)Nitrate doped ZTS crystals were found to be soft category materials. The second harmonic signal from ZTS and Neodymium(III) Nitrate doped ZTS crystals were tested by Kurtz-Perry method using Nd:YAG laser.
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CHANG, CHIA-LIN, and MICHAEL MCALEER. "JUST HOW GOOD ARE THE TOP THREE JOURNALS IN FINANCE? AN ASSESSMENT BASED ON QUANTITY AND QUALITY CITATIONS." Annals of Financial Economics 09, no. 01 (June 2014): 1450005. http://dx.doi.org/10.1142/s2010495214500055.
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The paper is concerned with ranking academic journal quality and research impact in Finance, based on the widely-used Thomson Reuters ISI (2013) Web of Science citations database (hereafter ISI). The paper analyses the 89 leading international journals in the ISI category of "Business–Finance" using quantifiable Research Assessment Measures (RAMs). The analysis highlights the similarities and differences in various RAMs, all of which are based on alternative transformations of journal citations and impact. Alternative RAMs may be calculated annually or updated daily to determine the citations frequency of published papers that are cited in journals listed in ISI. The RAMs include the classic 2-year impact factor including journal self citations (2YIF), 2-year impact factor excluding journal self citations (2YIF*), 5-year impact factor including journal self citations (5YIF), Immediacy including journal self citations, Eigenfactor (or Journal Influence), Article Influence (AI), h-index, Papers Ignored-By Even The Authors (PI-BETA), Self-citation Threshold Approval Rating (STAR), 5YD2 (namely, 5YIF divided by 2YIF), Escalating Self Citations (ESC) and Index of Citation Quality (ICQ). The paper calculates the harmonic mean (HM) of the ranks of up to 16 RAMs. It is shown that emphasizing 2YIF to the exclusion of other informative RAMs can lead to a misleading evaluation of journal quality and impact relative to the HM of the ranks. The analysis of the 89 ISI journals in Finance makes it clear that there are three leading journals in Finance, namely Journal of Finance, Journal of Financial Economics and Review of Financial Studies, which form an exclusive club in terms of the RAMs that measure journal quality and impact based on alternative measures of journal citations. The next two journals in Finance in terms of overall quality and impact are Journal of Accounting and Economics and Journal of Monetary Economics. As Accounting does not have a separate classification in ISI, the tables of rankings given in the paper are also used to rank the top 3 journals in the sub-category of Accounting in the ISI category of "Business – Finance", namely Journal of Accounting and Economics, Accounting Review, and Journal of Accounting Research.
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Gremyachih, Marina. "The study of the responsibility of persons who don’t have children as a promising area of psychological and pedagogical support of future parents." SHS Web of Conferences 70 (2019): 08016. http://dx.doi.org/10.1051/shsconf/20197008016.
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The article describes the problem of psychological support and training for such an untraditional category of people for a customized education system as people expecting or planning to have a child. The results of the study of responsibility as a personal property in the context of parent-child relationships are presented; in particular, the level of severity of the responsibility variables determined using the “Test of liability judgments” by A.I. Krupnova. The primary data underwent mathematical processing, which made it possible to determine the normality of the distribution of the sample, and subsequently establish statistically significant differences between harmonic and inharmonic responsibility variables. By mathematical processing of the data, the severity levels of the variables of the target, motivational, cognitive, productive, dynamic, emotional, regulatory and evaluative-reflexive components of responsibility are determined and the percentage of persons from the surveyed sample who have high, above average, average, below average and low levels is revealed parameters. Interpretation of the data obtained during the study, their analysis allow us to determine the features of the structure of responsibility of people who are expecting or planning to have a baby, as well as draw conclusions about the features of its development.
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Saloky, Kaitlin, Michael Aynardi, Kempland Walley, Paul Juliano, Heather Matchik, and Thomas Abraham. "Quantitative Assessment of Type-1 Collagen in Charcot Neuroarthropathy with Use of Harmonic Generation and Multiphoton Microscopy." Foot & Ankle Orthopaedics 3, no. 3 (July 1, 2018): 2473011418S0041. http://dx.doi.org/10.1177/2473011418s00414.
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Category: Diabetes Introduction/Purpose: Diabetic Charcot neuroarthropathy is characterized by rapid loss of bone with accompanied disruption to the surrounding joints and is often in the absence of trauma or infection. Previous research has demonstrated neuropeptide release and osteoclast activation in addition to increased collagen turnover. Currently, there is limited understanding on the impact of the disease on type-1 collagen within the joint synovium. The purpose of this study was to analyze qualitative and quantitative differences in type-1 collagen between diabetic, neuropathic patient controls and those with Charcot neuroarthropathy. Methods: A prospective case-control study using routinely discarded surgical waste synovial tissue from diabetic, neuropathic patients with and without Charcot. The tissue was prepared in the laboratory for analysis. Microscopy was performed using multiphoton excitation fluorescence (MPEF) and second harmonic generation (SHG) microscopy techniques, utilizing a mode locked femto-second i: Sapphire Tsunami (Spectra-Physics, Mountain View, CA) synchronously pumped by a Millenia Xs J (Spectra-Physics) diode-pumped solid state laser. Qualitative and quantitative microscopic analysis was performed on Charcot specimens and controls. A statistical analysis was performed to detect a quantitative difference in type-1 collagen. Results: An analysis was performed on 8 samples; 4 neuropathic controls and 4 Charcot neuroarthropathy samples. There was a statistically significant difference between the amount, the quality and organization of type-1 collagen (p<0.0001). The Charcot group had significantly less type-1 collagen when compared to the control (p<0.0001). Qualitative analysis was performed using a mean intensity value. The control group’s mean intensity was 2561.4 nm while the Charcot group’s was 884.1 nm. The Charcot group had a significantly smaller mean intensity indicating poorer quality of collagen (p<0.0001). Orientation index was used to assess the organization of type-1 collagen in the synovium. A smaller orientation index signifies an increase in disorganization. The Charcot group had a significantly smaller orientation index of 16.5 compared to the control group’s 27.8 (p<0.0001). Conclusion: Charcot neuroarthropathy leads to significant abnormalities in type-1 collagen within the joint synovium when compared to the diabetic controls. Further research will determine if these differences are attributable to neuropeptide release and osteoclastic activation.
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Aswirna, Prima, and A. Ritonga. "THE DEVELOPMENT OF DISCOVERY LEARNING - BASED E-BOOK TEACHING E-BOOK BASED ON KVISOFT FLIPBOOK MAKER ON SCIENCE LITERATION." HUNAFA: Jurnal Studia Islamika 17, no. 2 (December 22, 2020): 47–79. http://dx.doi.org/10.24239/jsi.v17i2.590.47-79.
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This research is motivated by the outstanding printed books that do not display interactive simulations by combining text, images, audio, video, and animation so that they are less attractive, the availability of communicative science learning media and have many interesting displays that have not yet been developed, teaching materials used in schools in the form of printed-based teaching materials such as physics textbooks and the availability of instructional media less utilizing existing technology in the learning process and lack of reading skills, interest in reading and lack of understanding of scientific concepts of students as well as the lazy nature possessed by students. Research and teaching materials e -Book discovery based flipbook maker kvisoft aided learning is a research and development ( Research and Developmet) by adapting the procedural step, namely ADDIE Analysis (analysis), Design (design), Development (development), Implementation (implementation) and Evaluation (evaluation). The validity test of e- book teaching materials based on discovery learning assisted by Kvisoft Flipbook Maker was conducted by five experts, two material experts, two media experts and one linguist. Practicality test of discovery learning based e- book teaching material assisted by flipbook maker kvisoft by looking at the practicality questionnaire sheet by science educators and some students of class X-MIA MAN 2 Padang Pariaman. Test the effectiveness of discovery learning based e-book teaching materials using Kvisoft Flipbook Maker by looking at the scientific literacy of students using the effectiveness questionnaire sheets by class X-MIA MAN 2 students in Padang Pariaman.
The results showed, e- book teaching materials based on discovery learning assisted by Kvisoft Flipbook Maker on material momentum and impulses and simple harmonious vibrations of class X-MIA MAN 2 Padang Pariaman on the ability of students' scientific literacy, learning materials based on Kvisoft discovery learning assisted by Kvisoft flipbook maker on the material of momentum and impulses and simple harmonic vibrations class X-MIA MAN 2 Padang Pariaman is very valid with an average of getting 88.7% for the material of momentum, impulses and simple harmonic vibrations with a very valid category. Practicality results obtained an average value of 88.49% categorized as very practical, while for the effectiveness of e- book learning materials based on Discovery Learning assisted by Flipbook Maker obtained an average value of 80.89% for the scientific literacy ability of students. The results can be concluded that the e-book teaching material based on discovery learning assisted by Koftoft Flipbook maker on material momentum, impulses, and simple harmonic vibrations is very valid, very practical, and effectively used in physics learning class X MIPA -1 MAN 2 Padang Pariaman.
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Wang, Tao, Jin Wang, Jian Wu, Pengfei Ma, Rongtao Su, Yanxing Ma, and Pu Zhou. "Near-Infrared Optical Modulation for Ultrashort Pulse Generation Employing Indium Monosulfide (InS) Two-Dimensional Semiconductor Nanocrystals." Nanomaterials 9, no. 6 (June 7, 2019): 865. http://dx.doi.org/10.3390/nano9060865.
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In recent years, metal chalcogenide nanomaterials have received much attention in the field of ultrafast lasers due to their unique band-gap characteristic and excellent optical properties. In this work, two-dimensional (2D) indium monosulfide (InS) nanosheets were synthesized through a modified liquid-phase exfoliation method. In addition, a film-type InS-polyvinyl alcohol (PVA) saturable absorber (SA) was prepared as an optical modulator to generate ultrashort pulses. The nonlinear properties of the InS-PVA SA were systematically investigated. The modulation depth and saturation intensity of the InS-SA were 5.7% and 6.79 MW/cm2, respectively. By employing this InS-PVA SA, a stable, passively mode-locked Yb-doped fiber laser was demonstrated. At the fundamental frequency, the laser operated at 1.02 MHz, with a pulse width of 486.7 ps, and the maximum output power was 1.91 mW. By adjusting the polarization states in the cavity, harmonic mode-locked phenomena were also observed. To our knowledge, this is the first time an ultrashort pulse output based on InS has been achieved. The experimental findings indicate that InS is a viable candidate in the field of ultrafast lasers due to its excellent saturable absorption characteristics, which thereby promotes the ultrafast optical applications of InX (X = S, Se, and Te) and expands the category of new SAs.
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Iskandar, Ananda Mahaputra, Dinda Nurfadiah, Widia Iswari Yuli, and Desnita Desnita. "Meta-Analisis Pengaruh Model Problem Based Learning terhadap Kemampuan Berpikir Kritis Siswa." Jurnal Pendidikan Fisika dan Teknologi 7, no. 1 (June 30, 2021): 48. http://dx.doi.org/10.29303/jpft.v7i1.2714.
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This meta-analysis research was conducted with several objectives. First is analyzing that influence given by the problem-based learning model of students' critical thinking skills. Second is to analyze the magnitude of the influence exerted by the problem based learning model based on the level of education (SMA and SMP). The third is to review the magnitude of the influence of using the problem-based learning model based on the material being taught (Work and Energy, Fluid, Substance Pressure, Motion, Elasticity, Harmonic Vibration, Electric Current and Electrical Resistance, Temperature and Heat). The fourth examines the magnitude of the influence of the problem-based learning model based on grade levels (VII, VIII, X and XI). The method used in this research is meta-analysis, which is to analyze 20 articles from existing research. Obtained 4 effect size values from the research that has been done. For the effect size, the ability to think critically is 2.25 which is in the high category. Aspect effect size based on the level of education is 2.43 for SMA level. The effect size for the aspect based on the material is 2.99 for the fluid material and the effect size for the aspect based on the grade level is 3.33 at grade XI level.
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Balant, Anne, Heather Lai, and Vayda M. Wilson. "Pitch strength and annoyance of acoustic analogs of flutter echo - a pilot study." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 4 (August 1, 2021): 2145–56. http://dx.doi.org/10.3397/in-2021-2062.
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The impetus for this pilot study was the observation of flutter echoes on the aisle of a church with a barrel-vaulted ceiling. When source and receiver height were comparable, the flutter echoes consisted of a 39-msec repeating pattern of three short pulses that persisted for reverberation times of up to 5 sec. The disruptive quality of these echoes perceptually was striking. It was hypothesized that the perception of a sequence of rapidly alternating periodicity pitches might be the source of this disruptive quality. A pilot study was conducted to assess the perceived pitch, pitch strength, and annoyance of isochronous and anisochronous synthetic pulse trains involving up to three different inter-pulse intervals per pattern. Intervals of the anisochronous pulse trains were controlled to create harmonic and inharmonic relationships among the intervals, which ranged from 5-20 msec. Twelve adult college students participated in the study remotely via videoconferencing due to social distancing requirements. A modified category scaling method was used. Participants positioned a slider on a graphical user interface to reflect their ratings of pitch strength and annoyance and used a slider to adjust the frequency of a reference tone for pitch matching. Results and implications for further research will be presented.
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Feddersen-Petersen, D. U. "Vocalization of European wolves (<i>Canis lupus lupus</i> L.) and various dog breeds (<i>Canis lupus</i> f. fam.)." Archives Animal Breeding 43, no. 4 (October 10, 2000): 387–98. http://dx.doi.org/10.5194/aab-43-387-2000.
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Abstract. Barking in domestic dogs still remains a topic of controversial discussions. While some authors assess dogbarking an acoustic means of expression becoming more and more sophisticated during domestication, others name this sound type "non-communicative". Vocal repertoires as works on individual sound types are rare, however, and there has been almost no work done on Iow-intensity, close-range vocalizations, yet such types of vocalization are especially important with the more social canids, hence, with the human-dog-communication and understanding of dogs. Most of the investigations published so far are based on auditive sound impressions and lack objectivity. The principal method used in this study was sonagraphic. This facilitates the identiftcation of sounds and reveales, whether subjective Classification can be verified by objectively measured parameters. Finally, meanings, funetions and emotions were examined for all the major sounds described and are discussed in terms of relationships between sound structure and Signal function, signal emission and social context as behavioural response, and overlapping Channels of communication. Ontogeny of acoustic communication in 11 European wolves has been compared to various dog breeds (8 Standard Poodles, 8 Toy Poodles, 15 Kleine Münsterländer, 11 Weimaraner Hunting Dogs, 16 Tervueren, 12 American Staffordshire Terriers, and 13 German Shepherds, 12 Alaskan Malamutes, and 9 Bull Terriers) from birth up to 8 (12) weeks resp. 4 (12) months of age. Noisy and harmonic sound groups were analysed separately as overriding units. Following parameters were used: fmax=maximum of spectrographic pietured sounds (Hz), xfo=mean of the lowest frequency band of harmonic sounds (Hz), xfd = mean of the frequency of strongest amplitude of noisy sounds (Hz), delta f = frequency range of sounds (Hz), duration of sounds (ms). Statistical analysis was run on "Statistica", Release 4,0. Within the sound type barking 2 to 12 subunits were classified in the different breeds, aecording to their context-speeifie spectrographic design, and behavioural responses. Categories of function / emotion include f.e. social play, play soliticing, exploration, caregiving, social contact and "greeting", loneliness, and agonistc behaviours. "Interaction" was the most common category of social context for masted barkings (56% of oecurences). Especially close-range vocalizations, conceming the major sound type of most domestic dogs, the bark, evolved highly variable. However, the ecological niche of domestic dogs is highly variable, just as the individual differences in the dogs are, which seem to be breed-typical to a great extent. Thus, complexity within the dog's vocal repertoire, and therefore enhancement of its communicative value, is achieved by many subunits of bark, some standing for specific motivations, informations and expressions. Complexity within the dogs'vocal repertoire is extended by the use of mixed sounds in the barking context. Transitions and gradations to a great extend oeeur via bark sounds: harmonic, intermediate and noisy subunits.
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Iyere, Sunday F., Francis I. Anyasi, Idim A. Idim, and Emmanuel Ekwueme. "Performance evaluation of 2.4kVA grid-tie inverter." Journal of Electrical, Control and Telecommunication Research 2 (November 30, 2020): 42–51. http://dx.doi.org/10.37121/jectr.vol2.134.
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This paper is focused on experimenting the overall performance of a 2.4kVA direct solar power supply system. The overall aim is to implement a solar power supply system without a battery back-up in order to minimize cost. The objectives include measuring the performance of grid-tie inverter, determine its period of operation under load conditions, to make the use of batteries optional in solar power supply system and minimize initial cost of installation. Various tests (variable load, fixed load and no-load) were carried out for the purpose of analysis. A dual trace digital storage oscilloscope was used to monitor the output waveform of the inverter to observe possible harmonic distortion on the waveform. The inverter takes its input power directly from the solar modules (panels) through the maximum power point tracker (MPPT) charge controller. Each category of test was conducted for at least three days of different weather conditions, to determine how variation in the sun’s intensity (irradiance) affects the operation of the inverter and its output power. Test results show that the inverter performs its function during the day apart from the early hours in the morning and later in the evening of each day, and the loads were powered successfully during the period of test. The output waveform as observed from the oscilloscope is not purely sinusoidal; it is rather a modified sine wave.
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Abraham, Thomas, Kirsten (Rebecca) Koob, Nurgul Carkaci-Salli, and Umur Aydogan. "Detection of the Tendon Properties in Posterior Tibial Tendinopathy in Three-Dimensional Space Using High Resolution Multiphoton and Second Harmonic Generation Imaging." Foot & Ankle Orthopaedics 4, no. 4 (October 1, 2019): 2473011419S0008. http://dx.doi.org/10.1177/2473011419s00083.
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Category: Hindfoot Introduction/Purpose: Posterior tibial tendon dysfunction is the most common cause of acquired flat foot deformity in adults, and results in significant morbidity. The exact etiology of this condition is still unknown. Posterior tibial tendon is predominately made up of fibrillar collagens and we hypothesize that their structural properties such as the collagen fiber density, orientation properties and cross-linking density essentially control the biomechanical properties of posterior tibial tendons. In this study, our aim is to visualize and quantitate fibrillar collagen distributions, their organization, cross-link densities and the fiber orientation (using Fourier analysis) in three distinct regions of pathologic posterior tibial tendon human samples namely proximal, middle and distal regions. Methods: After an institutional IRB approval we obtained diseased posterior tibial tendon total excision samples from 10 patients that had reconstructive procedures for posterior tibial tendinopathy at our institution and two fresh non-frozen healthy posterior tibial tendon samples from cadavers were used as the control. This research mainly utilized well established multiphoton microscopy and harmonic generation methodologies which compared proximal, middle and distal 1/3 of the tendon samples; multiphoton microscopy provides a powerful imaging method for evaluation of remodeling of fibrillar collagen structures deep within tissues. Ultra-short IR laser pulses served as an excitation source to produce multiphoton excitation fluorescence (MPEF) from endogenously fluorescent macromolecular systems and to induce highly specific second harmonic generation (SHG) signals from fibrillar collagens. Since MPEF and SHG involve different principles and contrast mechanisms, they were captured simultaneously to provide spectrally and spatially resolved, quantitative imaging of complex structures. Results: We systematically examined the nature of fibrillar collagen remodeling in relatively thick posterior tibial tendon tissues. Representative 3D forward SHG (FSHG), backward SHG (BSHG) and auto-fluorescence (MPEF) images originating from fibrillar collagen matrix from relatively thick (˜50 microns) posterior tibial tendon sections of three different regions namely proximal, middle and distal regions are shown in Figure 1. Computed Orientation Index values obtained from Fourier analysis show statistically significant differences particularly between proximal and middle regions (decreased orientation of collagen fibers in the middle region, p<0.0001). The cross-linking densities determined from the ratio of auto-fluorescence (MPEF) to BSHG again show differences particularly between proximal and middle regions (increased cross-linking in the middle region, p<0.01). Conclusion: The multiphoton and harmonic generation microscopy can be a powerful high resolution imaging method requiring minimal sample preparation that can provide structural information about spatially and spectrally resolved fibrillar collagens in three different posterior tibial tendon tendon regions. We found that middle third of the pathologic tendons show increased cross-linking and decreased orientation ratio of the collagen fibers which can provide insight into the regional based collagen remodeling and improved understanding of earliest stages of tendon destruction that could lead to improvements in the treatment of this condition.
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Marabello, Domenica, Paola Antoniotti, Paola Benzi, Carlo Canepa, Eliano Diana, Lorenza Operti, Leonardo Mortati, and Maria Paola Sassi. "Fructose calcium chloride MOFs for NLO applications." Acta Crystallographica Section A Foundations and Advances 70, a1 (August 5, 2014): C1248. http://dx.doi.org/10.1107/s2053273314087518.
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Non-centrosymmetric Metal Organic Frameworks (MOF) based on coordination of carbohydrates on alkaline metal ion represent an ideal category of compounds to plan functional materials with interesting second-order non-linear optics properties. Two MOFs obtained from fructose and calcium chloride, [Ca(C6H12O6)(H2O)2]Cl2 (1) and [Ca(C6H12O6)2(H2O)2]Cl2·H2O (2), have been synthetized in ethanol and by solid-solid interactions and have been characterized with X-ray diffraction and IR and RAMAN spectroscopy. The two compounds have also been studied with DFT theoretical calculations to investigate their relative stability and foresee their optical properties. Finally, the second harmonic generation (SHG) properties have been evaluated by SHG microscopy. It has been demonstrated that the coordination of fructose on the calcium ion causes an improvement of the SHG intensity with respect to the fructose itself and that there is a strictly correlation between the calculated dipole moment and the first static hyperpolarizability values and intensity of the SHG signal. Furthermore, the remarkable difference in the SHG intensity of the two compounds studied, suggests that this physical property can be "controlled" not only by tuning the composition of the system, but also by the disposition of the MOF's building units in the crystal. The metal-carbohydrate based MOFs analyzed in this work have a favorable combination of thermal and chemical stability, transparency, and second-order optical non-linearity and are thus potential candidates for applications in electro-optic devices.
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CHANG, CHIA-LIN, and MICHAEL MCALEER. "WHAT DO EXPERTS KNOW ABOUT FORECASTING JOURNAL QUALITY? A COMPARISON WITH ISI RESEARCH IMPACT IN FINANCE." Annals of Financial Economics 08, no. 01 (June 2013): 1350005. http://dx.doi.org/10.1142/s201049521350005x.
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Experts possess knowledge and information that are not publicly available. The paper is concerned with forecasting academic journal quality and research impact using a survey of international experts from a national project on ranking academic finance journals in Taiwan. A comparison is made with publicly available bibliometric data, namely the Thomson Reuters ISI Web of Science citations database (hereafter ISI) for the Business–Finance (hereafter Finance) category. The paper analyses the leading international journals in Finance using expert scores and quantifiable Research Assessment Measures (RAMs), and highlights the similarities and differences in the expert scores and alternative RAMs, where the RAMs are based on alternative transformations of citations taken from the ISI database. Alternative RAMs may be calculated annually or updated daily to answer the perennial questions as to When, Where and How (frequently) published papers are cited (see Chang et al., 2011a,b,c). The RAMs include the most widely used RAM, namely the classic 2-year impact factor including journal self citations (2YIF), 2-year impact factor excluding journal self citations (2YIF*), 5-year impact factor including journal self citations (5YIF), Immediacy (or zero-year impact factor (0YIF)), Eigenfactor, Article Influence, C3PO (Citation Performance per Paper Online), h-index, PI-BETA (Papers Ignored — By even the Authors), 2-year Self-citation Threshold Approval Ratings (2Y-STAR), Historical Self-citation Threshold Approval Ratings (H-STAR), Impact Factor Inflation (IFI), and Cited Article Influence (CAI). As data are not available for 5YIF, Article Influence and CAI for 13 of the leading 34 journals considered, 10 RAMs are analysed for 21 highly-cited journals in Finance. The harmonic mean of the ranks of the 10 RAMs for the 34 highly-cited journals are also presented. It is shown that emphasizing the 2-year impact factor of a journal, which partly answers the question as to When published papers are cited, to the exclusion of other informative RAMs, which answer Where and How (frequently) published papers are cited, can lead to a distorted evaluation of journal impact and influence relative to the Harmonic Mean rankings. A linear regression model is used to forecast expert scores on the basis of RAMs that capture journal impact, journal policy, the number of high quality papers, and quantitative information about a journal. The robustness of the rankings is also analyzed.
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Anwar, Anwar, Yusrizal Yusrizal, and Zulkarnaen Jalil. "IMPLEMENTASI STRATEGI PROBLEM SOLVING DENGAN MENGGUNAKAN METODE EKSPERIMEN UNTUK MENINGKATKAN MINAT DAN KETRAMPILAN BERPIKIR KRITIS SISWA DI MAN GANDAPURA PADA MATERI GERAK HARMONIK." Jurnal IPA & Pembelajaran IPA 1, no. 1 (January 4, 2018): 16–25. http://dx.doi.org/10.24815/jipi.v1i1.9460.
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Abstrak. Penelitian ini merupakan penelitian pemecahan masalah (problem solving) yang difokuskan pada pembelajaran eksperimen pada konsep gerak harmonik dengan tujuan untuk meningkatkan keterampilan berpikir kritis dan minat siswa terhadap mata pelajaran fisika di MAN Gandapura BireuenPenelitian ini menggunakan metode eksperimen dengan desain pretest post-test, control group design. Teknik pengambilan sampel dengan pusposive sampling. Pengumpulan data dilakukan dengan pretest dan posttest untuk meningkatkan ketrampilan berpikir kritis. Lembar minat siswa untuk mengetahui minat siswa sebelum dan setelah menggunakan strategi Problem solving dengan menggunakan metode eksperimen. Hasil uji normalitas dan homogenitas menunjukkan bahwa data homogen dan berdistribusi normal. Oleh karena itu, uji beda rata-rata terhadap N-gain ketrampilan berpikir kritis antara kedua kelas menggunakan uji t. Hasil uji t diperoleh thitungttabel (6,33 2,010) artinya terjadi perbedaan ketrampilan berpikir kritis yang signifikan antara kedua kelas. Nilai rata-rata N-gain ketrampilan berpikir kritis untuk kedua kelas dengan kategori sedang. Minat belajar siswa setelah menggunakan strategi problem solving menggunakan metode eksperimen juga lebih tinggi, sehingga dapat disimpulkan bahwa pembelajaran dengan menggunakan strategi problem solving dapat meningkatkan ketrampilan berpikir kritis dan minat belajar siswa.Kata kunci: Stategi Problem Solving, metode eksperimen, minat dan ketrampilan berpikir kritis Abstract. This research is a problem-solving focused on learning experiments on the concept of harmonic motion with the aim to improve critical thinking skills and interest of the students towards subjects of physics at MAN Gandapura Bireuen. Penelitian using the experimental method to the design of the Pre-test Post-test, Control Group Design. The sampling technique pusposive sampling. The data collection is done by pretest and posttest to improve critical thinking skills. Sheets interest of students to determine student interest before and after use problem solving strategies using experimental method .. normality and homogeneity test results show that the data homogeneous and normal distribution. Therefore, different test average of the N-gain critical thinking skills between the two classes using the t test. T test results obtained t t table (6,33 2.010) means that there is a difference of critical thinking skills significant difference between the two classes. The average value of the N-gain critical thinking skills for both classes with the medium category. Student interest after using problem solving strategies using the experimental method is also higher, so it can be concluded that learning with problem solving strategies can enhance critical thinking skills and student interest.Keywords: Problem Solving, the experimental method, interest critical thinking skills