INTRODUCTION Polymer brackets still have some disadvantages because of decreased wear resistance and hardness. The aim of this study was to investigate the mechanical properties of alternative bracket polymers; urethane-dimethacrylate, high-density polyethylene, and an experimental bracket polymer (EBP) consisting of polyethylene and a copolymer were tested. Polycarbonate and polyoxymethylene b...

Abstract The agricultural sector and growing food production needs rely on chemical fertilizers. This initially had positive effects production, but over the last decade, negative impacts of overuse have resulted in low crop productivity, increased pest disease infestation, soil degradation, consequent adverse environmental parameters. As one possibilities organic farming, we found vermicompost...

one of the most important methods to produce sponge iron is coal based reduction of iron ore. direct reduction methods based on coal are being improved due to the abundance of coal sources and its lower cost in comparison with natural gas. volatile materials in coal play an important role in the reduction of iron oxides. in this study, noncoking coal with high volatile materials from iran and c...

A flipped classroom approach was implemented in a pharmacokinetics course to encourage active student learning and enable the development of higher level learning skills. Students viewed written and/or audiovisual recordings of content materials prior to active face-to-face engagement where they then applied their learning through the evaluation and analysis of different clinical scenarios, cal...

Fundamentals of materials represent a core subject at engineering universities dealing with various construction materials. The study the discipline and acquiring knowledge demand properly designed manual. Apart from content, manual authors should pay attention to way they compose text. Different tools are applied assess quality (its difficulty, complexity, readability). Readability formulae pl...

The use of digital learning materials through e-learning is expected to give students experience be able learn themselves in the industrial era 4.0. This study aims formulate an evaluation method for that relevant development model used. A qualitative approach with evaluative design in-depth analysis applied student research reports, specifically on materials. formative chosen and reasons selec...

Lockin thermography is used by RSAF and other aircraft companies. It involves actively applying sinusoidal thermographic waves to the specimen and observing phase and amplitude changes at the specimen surface in order to evaluate structural information below the surface. Experiments were performed to evaluate defect characteristics such as depth, size and shape. The specimen contained very wide...