The motivation to carry out this study stemmed from the generalized perception that nowadays youth lacks the skills for the 21st century.Especially the high-level competences like critical thinking, problem solving and autonomy.Several tools can help to improve these competences (e.g.the SCRATCH programming language), but, as researchers and educat

Because of the potential technical advantages, the contra-rotation technology has become a renewed interest in aviation and other applications.Contra-rotation increases efficiency in comparison with the single-rotor design, but this advantage is not fully harnessed.The axial spacing of two-stage contra-rotating blade rows has a significant impact o

Wavemeters are very important for precise and accurate measurements of both pulses and continuous-wave 9x11 pergola optical sources.Conventional wavemeters employ gratings, prisms, and other wavelength-sensitive devices in their design.Here, we report a simple and low-cost wavemeter based on a section of multimode fiber (MMF).The concept is to corr