Part Of Electromagnetic Wave Research Articles

Abnormal light propagation and the underdetermination of theory by evidence in astrophysics

We investigate the propagation of certain non-plane wave solutions to Maxwell’s equations in both flat and curved spacetimes. We find that such solutions (or rather parts of them) exhibit accelerative behaviour, and in particular do not propagate on straight lines. Having established these results, we then turn to their conceptual significance—which, in brief, we take to be the following: (i) one should not assume that the part of electromagnetic waves from outer space that is subject to detection is localised onto null trajectories; therefore (ii) astrophysicists and cosmologists should at least be wary about making such assumptions in their inferences from obtained data, for to do so may lead to incorrect inferences regarding the nature of our universe.

Perancangan dan Implementası Sımulator Kolımator Sebagaı Medıa Pembelajaran Topık Sınar-X

A collimator simulator which is an accessory in radiology equipment, has been made. This simulator was created as a learning medium to complete students' understanding in studying x-rays as part of electromagnetic waves. The research is divided into two stages, namely the manufacture of simulators and implementation as teaching materials. The collimator simulator is equipped with blades that are used to limit the radiation field area. In this study, collimator lamps were used to see the area of the field. The simulator is equipped with a motor to open and close the radiation window. The results of the implementation to students stated that students agreed that the collimator simulator learning media helped students to better understand the material.
 Keywords: learning media, collimator, radiation field area

Efficacy of Net Epoxy Resin for Electromagnetic Shielding in X-Band Frequency Range

Background: X-band microwaves, which are part of electromagnetic waves, have various applications, such as satellite communications, radar, navigation, air traffic control, marine functions, and weather stations. Therefore, many workers are exposed to these waves in the workplace. Previous studies showed that these frequencies have adverse health effects. In occupational health, the use of shielding as an engineering measure is a priority in controlling radiation in the workplace. Objectives: This study investigated the efficacy of net epoxy resin as electromagnetic shielding from occupational radiation. Materials and Methods: Epoxy plates were fabricated in three different thicknesses (2, 4, and 6 mm), and their shielding effectiveness was measured by a vector network analyzer. The amounts of reflected energy and transmitted energy were determined by using the scattering parameters. Results: The results showed that the epoxy plates 6 and 2 mm thick had the highest and the lowest averages of shielding effectiveness at 4.48 dB and 1.90 dB, respectively. However, increasing the thickness was useful up to 4 mm. In addition, in a similar attenuation pattern, X-band frequency was divided into lower, middle, and upper sections. The lower section had the highest shielding effectiveness. Conclusions: The results showed that reflection was the main mechanism in the overall shielding effectiveness. These findings indicate that epoxy resin could be applied as a proper shield against microwave radiation in the workplace.