State University of Semarang

About: State University of Semarang is a education organization based out in Semarang, Indonesia. It is known for research contribution in the topics: Population & Curriculum. The organization has 7737 authors who have published 7790 publications receiving 38055 citations. The organization is also known as: Universitas Negeri Semarang.

Pengembangan komik fisika berbasis android sebagai suplemen pokok bahasan radioaktivitas untuk sekolah menengah atas

Abstract: Pokok bahasan fisika pada sekolah menengah atas seringkali mengandung konsep abstrak, seperti pokok bahasan radioaktivitas. Terlebih, pokok bahasan radioaktivitas berada di akhir semester 2 kelas 12 SMA membuat siswa kurang mendalami pokok bahasan tersebut. Konsep abstrak bisa diatasi dengan menggunakan gambar, gambar dikembangkan dalam bentuk komik agar tercipta suasana belajar yang lebih menyenangkan dan menarik. Penelitian ini mengembangkan komik fisika bersifat mobile untuk sistem operasi Android sebagai suatu suplemen pembelajaran. Kelayakan komik diuji menggunakan metode angket, dokumentasi, serta tes rumpang untuk mengetahui tingkat keterbacaan komik. Angket diberikan kepada responden, yakni siswa kelas 12 SMA, guru fisika, ahli media, serta ahli materi. Penelitian ini menghasilkan aplikasi komik fisika berbasis Android sebagai suplemen pokok bahasan radioaktivitas untuk sekolah menengah atas. Komik yang dihasilkan memiliki tingkat keterbacaan sebesar 80,59%, yakni dalam kriteria tinggi. Skor rata-rata kelayakan komik fisika berbasis Android sebesar 77,91% atau dalam kriteria baik. Berdasakan indikator yang telah ditetapkan dan hasil data responden, maka aplikasi komik fisika berbasis Android layak digunakan sebagai suplemen pembelajaran pada pokok bahasan radioaktivitas untuk sekolah menengah atas.

Error Analysis Of Students Working About Word Problem Of Linear Program With NEA Procedure

Abstract: Evaluation and assessment is an important part of learning. In evaluation process of learning, written test is still commonly used. However, the tests usually do not following-up by further evaluation. The process only up to grading stage not to evaluate the process and errors which done by students. Whereas if the student has a pattern error and process error, actions taken can be more focused on the fault and why is that happen. NEA procedure provides a way for educators to evaluate student progress more comprehensively. In this study, students' mistakes in working on some word problem about linear programming have been analyzed. As a result, mistakes are often made students exist in the modeling phase (transformation) and process skills (process skill) with the overall percentage distribution respectively 20% and 15%. According to the observations, these errors occur most commonly due to lack of precision of students in modeling and in hastiness calculation. Error analysis with students on this matter, it is expected educators can determine or use the right way to solve it in the next lesson.

The Effect of Hybridisation on Mechanical Properties and Water Absorption Behaviour of Woven Jute/Ramie Reinforced Epoxy Composites.

Abstract: Recently, the most critical issue related to the use of natural fibre-reinforced polymer composites (NFRPC) is the degradation properties of composites exposed to the environment. NFRPC’s moisture absorption behaviour has adverse effects on the composite’s mechanical properties and dimensional stability. The purpose of this study is to analyse the mechanical properties of epoxy composites reinforced by jute–ramie hybridisation. This study also analysed the effect of stacking sequence hybridisation of the jute–ramie composite on water absorption behaviour. A five-layer different type of stacking sequence of single and hybrid jute–ramie is produced with the hand lay-up method. The results obtained from this study found that the mechanical properties and water absorption behaviour of a single jute fibre are lower compared to a single ramie fibre. The hybrid of jute–ramie has been able to increase the performance of composite compared to pure jute composites. The mechanical properties of the hybrid jute–ramie composite show a reduction effect after exposure to an aqueous environment due to the breakdown of fibre matrix interfacial bonding. However, after 28 days of immersion, all types of the stacking sequence’s mechanical properties are still higher than that of pure epoxy resin. In conclusion, the appropriate sequence of stacking and selecting the material used are two factors that predominantly affect the mechanical properties and water absorption behaviour. The hybrid composites with the desired and preferable properties can be manufactured using a hand-lay-up technique and used in the various industrial applications.