2 research outputs found
Upaya Peningkatan Hasil Belajar Senam Lantai Loncat Harimau Melalui Alat Bantu Pembelajaran Pada Siswa Kelas XI TKJ A SMK Tekno-SA Surakarta Tahun Pelajaran 2016/2017
No full textABSTRAK Mohamad Imaduddin Azka. UPAYA PENINGKATAN HASIL BELAJAR SENAM LANTAI LONCAT HARIMAU MELALUI PENGGUNAAN ALAT BANTU PEMBELAJARAN PADA SISWA KELAS XI TKJ A SMK TEKNO-SA SURAKARTA TAHUN PELAJARAN 2016 / 2017, Skripsi. Surakarta : Fakultas Keguruan dan Ilmu Pendidikan Universitas Sebelas Maret Surakarta, Agustus 2016. Tujuan Penelitian ini adalah untuk meningkatkan hasil belajar senam lantai loncat harimau menggunakan alat bantu pembelajaran pada siswa kelas XI TKJ A SMK TEKNO-SA Surakarta tahun pelajaran 2016/2017. Penelitian ini merupakan penelitian tindakan kelas (PTK). Penelitian ini dilaksanakan dalam dua siklus, dengan tiap siklus terdiri atas perencanaan, pelaksanaan tindakan, observasi, dan refleksi. Subjek penelitian adalah siswa kelas XI TKJ A SMK TEKNO-SA Surakarta yang berjumlah 26 siswa yang terdiri dari 6 siswa putri dan 20 siswa putra. Sumber data berasal dari guru, siswa dan peneliti. Teknik pengumpulan data adalah dengan observasi dan dokumentasi atau arsip. Validitas data menggunakan teknik triangulasi data. Analisis data menggunakan teknik deskriptif komparatif dengan menggunakan teknik presentase untuk melihat kecenderungan yang terjadi dalam kegiatan pembelajaran. Hasil analisis data dapat disampaikan sebagai berikut: hasil belajar senam lantai loncat harimau siswa pada Siklus I dari 26 siswa mencapai 61,54% atau sebanyak 16 siswa sudah masuk kriteria tuntas dan pada Siklus II meningkat mencapai 84,62% atau sebanyak 22 siswa sedangkan 4 siswa lainnya belum tuntas dengan KKM 75. Dari hasil analisis data diatas dapat disimpulan bahwa penggunaan alat bantu pembelajaran dapat meningkatkan hasil belajar senam lantai loncat harimau pada siswa kelas XI TKJ A SMK TEKNO-SA Surakarta tahun pelajaran 2016 / 2017. Kata Kunci :Hasil Belajar Senam Lantai Loncat Harimau, Alat Bantu Pembelajara
Development of an Acoustic Conduction Mechanism of a Metamaterial for Underwater Environment Applications
No full textThe reduction of engine noise is a challenging issue for devices that must operate silently. Noise is not only an annoyance, but it may also be utilized as a compass to identify clandestine vehicles, such as submarines. This is especially true when the stealthy vehicle in issue is involved. Traditional methods, such as identifying the source of the noise and taking the appropriate precautions to avoid it, could be used to regulate the noise level in a certain region. Due to the high mass density and low volume of the used materials, conventional construction techniques cannot be applied to underwater construction. It is crucial to develop innovative materials that have the potential to be employed in maritime applications. The study of acoustic metamaterials, which is currently a subject of significant attention because of its possible application in submarines, is frequently recognized as one of the most intriguing fields to have emerged in recent years. This chapter describes and highlights the benefits of acoustic metamaterials that have the potential to be utilized in submarines. Achieving high levels of sound absorption has been aided by the utilization of metamaterials, which are created by combining several materials of varying forms. The incorporation of numerous layers in the structure enhanced the material’s ability to absorb sound. Not only does the operation of the engine affect the level of background noise, but so do the characteristics of the numerous building components. Variations in engine speed and strain on the material cause a resonance effect, which is caused by the activation of the material’s intrinsic frequencies. Consequently, the use of sonar to pinpoint the precise location of submarines is fraught with danger. This study’s objective is to demonstrate the significance of the topic, as well as resonance protection measures and experimental results for resonance detection using acoustic analysis of metamaterial-based underwater acoustic channels. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025
