Penelitian ini bertujuan untuk mengetahui pemahaman konsep siswa tingkat representasi makroskopik, mikroskopik, dan simbolik pada materi ikatan kimia di SMAT Wira Bhakti Gorontalo. merupakan penelitian deskriptif kualitatif yang diujikan kepada 57 kelas X Pengumpulan data menggunakan tes diagnostik tiga tingkat. Level dibagi menjadi kategori yaitu paham konsep, tidak miskonsepsi, terdiri dari s...

This paper presents a method for robustly tracking and estimating the face pose of a person using stereo vision. The method is invariant to identity and does not require previous training. A face model is automatically initialised and constructed on-line: a fixed point distribution is superposed over the face when it is frontal to the cameras, and several appropriate points close to those locat...

This paper presents an investigation of the interface quality of nanocristallised 316L stainless steel multilayer structures. They were produced by a duplex process, combining the Surface Mechanical Attrition Treatment (SMAT) and the co-rolling process at two different annealing temperatures (550°C and 650°C). Oxide layers were observed at the interfaces between the sheets and their morphology ...

High-rate squeezing process of bulk metallic glasses from a cylinder into an intact sheet achieved by impact loading is investigated. Such a large deformation is caused by plastic flow, accompanied with geometrical confinement, shear banding/slipping, thermo softening, melting and joining. Temperature rise during the high-rate squeezing process makes a main effect. The inherent mechanisms are i...

Surface mechanical attrition treatment (SMAT) or ultrasonic shot peening method improves properties of metallic materials by causing the plastic deformation on their surface layer workpiece. In this research, an generator, booster, a sonotrode, one hundred steel balls with mean diameter 1 mm, optical microscope, automatic roughness meter, and other supporting accessories are employed to conduct...

Abstract Surface nanocrystallization provides the opportunity to produce gradient-structured metallic materials with improved properties. Several attempts have been made nanostructured stainless steel (SS), along study of resultant corrosion resistance. However, current knowledge is insufficient address mechanism and possible ways enhancing resistance after surface treatment. The present work r...