Due to the COVID-19 pandemic that bursted out this year, online education has become a main type of education and an entire education system was forced to make a switch from classrooms to World Wide Web. The impact of the students receiving education online for the entire semester on their final grade was analysed and the results are shown in the paper. These results are obtained by analysing the academic course Mathematical Analysis 2, held online at the Faculty of Electrical Engineering and Computing, University of Zagreb, Croatia, in the summer semester of 2020. Furthermore, the number of views of the lectures in relation to the time left until the final exam was checked in order to investigate the students' studying habits. Unsurprisingly, the most noticeable effect here is the last minute cramming. Nevertheless, the overall results show the pros and cons of online education, as well as the huge potential that online education has, even when performed at the current state.
Assurance of high measuring sensitivity is one of the most challenging issues for any nuclear magnetic resonance (NMR) spectroscopy system. To this end, we propose an accurate noise model of the entire probe-to-spectrometer receiving chain for condensed matter physics, based on the concept of noise figure. The model predicts the propagation of both the signal and noise levels in every component of the NMR spectroscopy receiving chain. Furthermore, it enables identification of the "weakest" component and, therefore, the optimization of the whole system. The most important property of the proposed model is the possibility to find system parameters that reduce the measurement time by an a priori calculation, rather than an a posteriori approach. The model was tested experimentally on several different samples. It was found that the measurement time can still be significantly shortened, down to at least one half of the measurement time, starting from optimized conditions with commercially available components. Thus, the proposed model can be used as a tool for both quantitative analysis of the noise properties and a sensitivity prediction of practical NMR systems in physics and material science.
9 th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics Metamaterials 2015 Beyond the Bethe limit: Tunable enhanced light transmisson through a single wavelength aperture, Split-ring-resonator-coupled enhanced transmission through a single subwavelength aperture Metamaterial covers over a small aperture, Broadband negative-capacitor-based enhanced transmission through subwavelength aperture Active Reconfigurable Metamaterial Unit Cell Based on Non-Foster Elements,
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