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Articles 31 - 33 of 33
Full-Text Articles in Engineering
Improving Link Quality Estimation In Zigbee Networks, Srikar Meka
Improving Link Quality Estimation In Zigbee Networks, Srikar Meka
Graduate Research Theses & Dissertations
Estimation of links in a Wireless Sensor Network and using such estimates to decide between all the multiple paths available in a network is important. There are several link estimation methods available. This thesis evaluates the performance of PRR based method (P-success method), suggested in the ZigBee specification and LQI based method (LQI method) used by different organizations, in various scenarios. The performance of these two link cost estimation methods is also compared under Wi-Fi interference. This comparison is done using a network simulator (NS3). It is observed that, if there is no Wi-Fi interference, both the P-success and LQI …
Magnetotransport In Zrte5 Crystals, Maksim Andreevich Sultanov
Magnetotransport In Zrte5 Crystals, Maksim Andreevich Sultanov
Graduate Research Theses & Dissertations
ZrTe5 is a topological material that is predicted to have a strain or temperature induced phase transition from a topological insulator state into a Weyl/Dirac semimetal state. In this study I find that there is insufficient evidence to support the claims for the existence of such a phase transition. I performed magnetoresistivity measurements using a Quantum Design Physical Properties Measurement System (PPMS) to measure the transverse and longitudinal resistivities at various temperatures and different strengths and orientations of the magnetic field. The measurement results were analyzed using OriginPro to determine the carrier mobility and density and to determine the temperature …
Studies On Semiconductor Gas Sensors Using Nanostructure Growth Employing Ortho-Glancing Angle Deposition, Dean R. Walters
Studies On Semiconductor Gas Sensors Using Nanostructure Growth Employing Ortho-Glancing Angle Deposition, Dean R. Walters
Graduate Research Theses & Dissertations
A program of research was undertaken to develop the next generation of metal oxide gas sensors, which, for the purpose of this research, were made from materials using a unique approach of glancing angle deposition (GLAD) that is scalable to large scale production. This research seeks to demonstrate that high-sensitivity sensors can be produced. The sensors were examined in a test system of novel design in which the units underwent performance measurements using analyte gases, such as carbon dioxide, nitrogen, and water.
Gas sensors can be improved by increasing the surface area of the active sensing media, and in this …