META ANALISIS PENDEKATAN BERDIFERENSIASI PADA PEMBELAJARAN FISIKA

Salah satu cara yang dapat diambil oleh guru untuk meningkatkan prestasi belajar dan keterampilan proses sains siswa dalam pembelajaran fisika di SMA adalah melalui penggunaan pendekatan berdiferensiasi. Pendekatan ini dikenal sebagai strategi instruksional yang membantu guru dalam manajemen kelas, mengarahkan pembelajaran, serta mendorong dan memantau perkembangan siswa sehingga setiap siswa dapat mencapai hasil belajar yang optimal. Penelitian ini bertujuan untuk mengevaluasi efektivitas pendekatan berdiferensiasi dalam pembelajaran fisika di SMA, menggunakan metode Meta Analisis dengan teknik perhitungan effect size. Sampel penelitian terdiri dari 20 artikel ber- ISSN. Hasil penelitian menunjukkan beberapa temuan penting: 1) Rata-rata effect size dari penerapan pendekatan berdiferensiasi dalam pembelajaran fisika di SMA adalah sebesar 1,95 dengan kategori tinggi. Hal ini menunjukkan bahwa pendekatan berdiferensiasi efektif dalam meningkatkan hasil belajar dan keterampilan proses sains siswa dalam pembelajaran fisika di SMA; 2) Pada tingkat pendidikan SMA, pendekatan berdiferensiasi yang terbimbing memberikan pengaruh yang lebih besar dibandingkan dengan jenis pendekatan lainnya terhadap pembelajaran fisika. Dengan demikian, dapat disimpulkan bahwa penerapan pendekatan berdiferensiasi dalam pembelajaran fisika di SMA membawa dampak positif yang signifikan, terutama ketika pendekatan tersebut diarahkan dan dibimbing secara efektif.Kata kunci: Pendekatan Berdiferensiasi, Pembelajaran Fisika

Tracking the Equator Into the Paleogene (abstract of paper presented at AGU Fall Meeting, San Francisco, 8-12 Dec 2003)

Stratigraphy has been compiled for 63 tropical Pacific drill sites that sample lower Neogene and Paleogene sediments. These Sites derive from drilling on DSDP Leg 5 through ODP Leg 199. All Sites have been put on the biostratigraphic and paleomagnetic timescale refined by Leg 199 scientists. Sediment accumulation rates have been calculated for ten intervals ranging in age from 10 Ma to 56 Ma. A simple fixed hotspot model was used for Pacific lithospheric plate rotation in reconstructing the position of the selected sites for each of these ten intervals. The reconstruction of all intervals show the development of a tongue of relatively high accumulation rates associated with the oceanographic divergence at the geographic equator. The estimated position of the geographic equator based on these reconstructions lies consistently south of the position of the equator based on the rotation model used. However, the southward displacement is generally 2 degrees of latitude or less. We believe that this relatively small disagreement between the two estimates of equatorial position back to 56 Ma indicates: 1) Whatever hotspot movement that may have occurred in the interval between 40 and 56 Ma did not affect the motion of the Pacific plate; its motion after 40 Ma appears to have been approximately the same as before 40 Ma. 2) The estimated rate of true polar wander during the interval of 40 - 56 Ma must be very small (~0.125$\deg$/m.y.) and is probably not significant (i.e., well within the error of these reconstructions)

Boundaries of Oscillatory Motion in Structures with Nonviscous Dampers

[EN] In this paper, a new methodology for the determination of the boundaries between oscillatory and non-oscillatory motion for nonviscously damped nonproportional systems is proposed. It is assumed that the damping forces are expressed as convolution integrals of the velocities via hereditary exponential kernels. Oscillatory motion is directly related to the complex nature of eigensolutions in a frequency domain and, in turn, on the value of the damping parameters. New theoretical results are derived on critical eigenmodes for viscoelastic systems with multiple degrees of freedom, with no restrictions on the number of hereditary kernels. Furthermore, these outcomes enable the construction of a numerical approach to draw the critical curves as solutions of certain parameter-dependent eigenvalue problems. The method is illustrated and validated through two numerical examples, covering discrete and continuous systems.This research was partially supported by the Grant PID2020-112759GB-I00, funded by MCIN/AEI/10.13039/501100011033, and by "ERDF A way of making Europe".Lázaro, M.; García-Raffi, LM. (2022). Boundaries of Oscillatory Motion in Structures with Nonviscous Dampers. Applied Sciences. 12(5):1-23. https://doi.org/10.3390/app1205247812312

Nonlinear self-collimated sound beams in sonic crystals

We report the propagation of high-intensity sound beams in a sonic crystal, under self-collimation or reduced-divergence conditions. The medium is a fluid with elastic quadratic nonlinearity, where the dominating nonlinear effect is harmonic generation. The conditions for the efficient generation of narrow, non-diverging beam of second harmonic are discussed. Numerical simulations are in agreement with the analytical predictions made, based on the linear dispersion characteristics in modulated media and the nonlinear interaction in a quadratic medium under phase matching conditions.Comment: Sent to PR

Analysis of Oscillations in a Cableway: Wind Load Effects

[EN] The purpose of this paper is to develop and investigate a non-linear model for analysing the reaction of a self-detachable cabin monocable ropeway exposed to a sudden deceleration and wind forces. The First and Second Newton's Law and Differential Equations are the basic tools for building the model. Furthermore a few basic considerations have been made about the air “dragging and lifting" forces that induce oscillations and vibrations in mechanical systems alike. All the numerical data used for the simulation was taken from a ropeway in the skiing site of Ravascletto-Zoncolan in the North- East of Italy.[ES] El propósito de este trabajo de carácter didáctico es el de desarrollar e investigar un modelo no lineal para el análisis de la reacción de una cabina de auto-aesmontable teleférico monocable expuesto a una desaceleración repentina y a las fuerzas del viento. La ley y las ecuaciones diferenciales de primer y segundo lugar de Newton son las herramientas básicas para la construcción del modelo. Además algunas consideraciones básicas se han hecho sobre el aire. Todos los datos numéricos utilizados para la simulación fueron tomados desde un teleférico en la estación de esquí de Ravascletto-Zoncolan en el noreste de Italia.The author Lluís M. Garcia Raffi want to thank EICE MoMa (UPV) for the help in thedevelopment of this work under grants PIME 2011/A09 y PID-DMA 2012. The author Jan Gustincic want to thanks to prof. Giuliano Stabon (University of Trieste) for providing the knowledge of the topic and the parameters values. Thanks also to Francesca D'Urzo for editing the paper.Gustincic, J.; Garcia-Raffi, LM. (2013). Analysis of Oscillations in a Cableway: Wind Load Effects. Modelling in Science Education and Learning. 6(1):145-155. doi:10.4995/msel.2013.1847SWORD14515561Halliday, Resnick, Krane. Physics 1 (2006)

Evidences of evanescent Bloch waves in Phononic Crystals

We show both experimentally and theoretically the evanescent behaviour of modes in the Band Gap (BG) of finite Phononic Crystal (PC). Based on experimental and numerical data we obtain the imaginary part of the wave vector in good agreement with the complex band structures obtained by the Extended Plane Wave Expansion (EPWE). The calculated and measured acoustic field of a localized mode out of the point defect inside the PC presents also evanescent behaviour. The correct understanding of evanescent modes is fundamental for designing narrow filters and wave guides based on Phononic Crystals with defects.Comment: 8 pages, 3 figure