Comparative Study on Priority Based QOS Aware Mac Protocols for WSN

n Wireless Sensor Network (WSN), QoS (Quality of S\ud ervice) in sensor application plays a very importan\ud t\ud role. QoS based routing is required to ensure the b\ud est use of nodes in WSN. In this paper, a comparati\ud ve\ud study of QoS based routing in Media Access Control\ud (MAC) protocols are presented based on the traits t\ud o\ud solve problems like prioritization, timeliness, rel\ud iability etc. The study mainly focuses on some prio\ud rity\ud based QoS protocols used in WSN and a comparison am\ud ong them. The study reveals that among the five\ud mentioned protocols; QMAC, PRIMA, DB-MAC, RAP, GTS;\ud PRIMA shows the best performance in the\ud category of Packet Prioritization, Scheduling Schem\ud e, Queue Type, Energy Awareness and Qo

Ultrawideband nanostructured metamaterial absorber with an Octagon-Packed Star-Shaped resonator for UV to NIR spectrum wavelength application

This article reveals and numerically analyzes a three-layer ultrawide-band nanostructured metamaterial absorber (MMA) formed of nickel, silicon dioxide, and nickel. It is possible to attain an absorption rate greater than 99 % for a bandwidth of 325 nm in the optical spectrum and an absorption rate of 95.91 % with a bandwidth of 2785 nm, spanning from 215 nm to 3000 nm (ultraviolet (UV) to near infrared (NIR) wavelength regions). The stability of absorption properties is observed for a large range of oblique incidence angles and polarization angles. Mechanical bending, which may arise due to extraneous stresses, has been found to have almost the same rate of absorption. The numerical analysis is verified theoretically using the interference theory (IT) model, and the ideal MMA characteristics are confirmed by the polarization conversion Ratio (PCR). The demonstrated MMA exhibits potential applications across diverse domains such as solar energy conversion, biomedical engineering, and sensing technology