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Full-Text Articles in Engineering
Open Source Low-Cost Power Monitoring System, Shane W. Oberloier, Joshua M. Pearce
Open Source Low-Cost Power Monitoring System, Shane W. Oberloier, Joshua M. Pearce
Joshua M. Pearce
This study presents an entirely open-source, low-cost power monitoring system capable of many types of measurements including both loads and supplies such as solar photovoltaic systems. In addition, the system can be fabricated using only open source software and hardware. The design revolves around the Digital Universal Energy Logger (DUEL) Node, which is responsible for reading and properly scaling the voltage and current of a particular load, and then serializing it via an on-board ATTiny85 chip. The configuration of the DUEL node allows for custom sensitivity ranges, and can handle up to 50 A and 300 V. Up to 127 …
Is Heyser Still Relevant?, Douglas R. Jones
Is Heyser Still Relevant?, Douglas R. Jones
Douglas R Jones
The author, highlighting excerpts from the writings of Richard C. Heyser, argues that Heyser continues to be relevant in the field of audio engineering nearly three decades after his death. Using material from the Richard C. Heyser Collection, held in the Columbia College Chicago Archives & Special Collections, the author chose comments from the collection, both published and unpublished "which should be at least intriguing and possibly down right shocking."
Tunable Miniaturized Rf Devices On Magneto-Dielectric Substrates With Enhanced Performance, Guomin Yang
Tunable Miniaturized Rf Devices On Magneto-Dielectric Substrates With Enhanced Performance, Guomin Yang
Dr Guomin Yang
In this dissertation we have studied planar microstrip antennas and RF filters miniaturization and performance improvement with novel substrate, superstrate and hybrid substrate/superstrate structure. In particular, we have compared dielectric materials and magneto-dielectric materials, and used the magneto-dielectric materials to counteract the narrowing of bandwidth, and the impedance mismatch due to the use of high permittivity materials as antenna substrates. However, from materials perspective, it has been challenging to achieve self-biased magnetic materials for antenna substrate applications at frequencies>600 MHz range due to the well known Snoek limit. Magnetic thin films provide a unique opportunity for achieving self-biased magnetic …
Optical Lithography Simulation Using Wavelet Transform, Rance Rodrigues
Optical Lithography Simulation Using Wavelet Transform, Rance Rodrigues
Rance Rodrigues
Optical lithography is an indispensible step in the process flow of Design for Manufacturability (DFM). Optical lithography simulation is a compute intensive task and simulation performance, or lack thereof can be a determining factor in time to market. Thus, the efficiency of lithography simulation is of paramount importance. Coherent decomposition is a popular simulation technique for aerial imaging simulation. In this thesis, we propose an approximate simulation technique based on the 2D wavelet transform and use a number of optimization methods to further improve polygon edge detection. Results show that the proposed method suffers from an average error of less …