2,509 research outputs found

    Development and validation of grade 10 science learning materials in selected secondary schools in district III, division of Puerto princesa city, Philippines

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    Introduction: With the recent implementation of the K-12 curriculum in the Philippines, teachers are challenged to develop relevant, research-based, and responsive instructional materials. Purpose: The main purpose of this study was to develop and validate learning material in physics based on selected least mastered competencies for tenth grades. The researcher developed a set of learning material which covers the topic mirror and lenses. Methodology: This study utilized the descriptive-developmental research focus on the development of instructional material. Mean and Mean Percentage Score (MPS) used to analyse descriptive data. Instructional materials support learning content, allow students to engage in the concepts application and provide an opportunity for evaluation. They are developed to help teachers facilitate learner’s prior knowledge, assist them to process and understand the new learning, and eventually aid them apply newly acquired knowledge to their practical lives. Results: The result of the study showed that students has low mastery in the topic light, specifically in mirror and lenses.  The developed set of learning materials was anchored to the ADDIE model: the Analysis, Design, Development, Implementation, and Evaluation. Recommendations/Classroom Implications:  Teachers should develop learning materials based on the least mastered competencies of the students. The proposed learning materials is recommended for use in Grade 10 Physics classes. Further, the proposed learning materials should be subjected for further research to determine its effectiveness in improving the performance of students in science 10 Physics

    Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

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    The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum
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