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Electromagnetics and Photonics Commons™
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- Publication
Articles 1 - 7 of 7
Full-Text Articles in Electromagnetics and Photonics
Led Street Light Research Project, Donald K. Carter, Stephen Quick
Led Street Light Research Project, Donald K. Carter, Stephen Quick
Stephen Quick
The City of Pittsburgh planned to replace its existing 40,000 street lighting fixtures with LED fixtures and engaged the Remaking Cities Institute (RCI) to investigate the full range of potential benefits of a replacement program in business districts. The study team investigated the technological potentials offered by LED lighting, best management practices (BMP) in LED lighting and lessons learned from cities where LED lighting has been installed, as well as the place-making and aesthetic impact of LED lighting and associated technologies. The team also investigated issues raised by the use of LEDs as the light source and issues of replacing …
Resonance Damping In Ferromagnets And Ferroelectrics, Allan Widom, Somu Sivasubramanian, Carmine Vittoria, S. Yoon, Yogendra N. Srivastava
Resonance Damping In Ferromagnets And Ferroelectrics, Allan Widom, Somu Sivasubramanian, Carmine Vittoria, S. Yoon, Yogendra N. Srivastava
Carmine Vittoria
The phenomenological equations of motion for the relaxation of ordered phases of magnetized and polarized crystal phases can be developed in close analogy with one another. For the case of magnetized systems, the driving magnetic field intensity toward relaxation was developed by Gilbert. For the case of polarized systems, the driving electric field intensity toward relaxation was developed by Khalatnikov. The transport times for relaxation into thermal equilibrium can be attributed to viscous sound wave damping via magnetostriction for the magnetic case and electrostriction for the polarization case.
Resonance Damping In Ferromagnets And Ferroelectrics, Allan Widom, Somu Sivasubramanian, Carmine Vittoria, S. Yoon, Yogendra N. Srivastava
Resonance Damping In Ferromagnets And Ferroelectrics, Allan Widom, Somu Sivasubramanian, Carmine Vittoria, S. Yoon, Yogendra N. Srivastava
Allan Widom
The phenomenological equations of motion for the relaxation of ordered phases of magnetized and polarized crystal phases can be developed in close analogy with one another. For the case of magnetized systems, the driving magnetic field intensity toward relaxation was developed by Gilbert. For the case of polarized systems, the driving electric field intensity toward relaxation was developed by Khalatnikov. The transport times for relaxation into thermal equilibrium can be attributed to viscous sound wave damping via magnetostriction for the magnetic case and electrostriction for the polarization case.
Multifrequency Wilkinson Power Divider Using Microstrip Nonuniform Transmission Lines, M. Khalaj-Amirhossein, M. Moghavvemi, Hossein Ameri Mahabadi
Multifrequency Wilkinson Power Divider Using Microstrip Nonuniform Transmission Lines, M. Khalaj-Amirhossein, M. Moghavvemi, Hossein Ameri Mahabadi
Hossein Ameri Mahabadi
A new idea is proposed to modify the conventional Wilkinson power dividers to operate at two or several desired frequencies. The proposed structure contains two Microstrip Nonuniform Transmission Lines (MNTLs) instead of two uniform ones with nearly the same length at the minimum frequency. The strip width of MNTLs is considered variable and is written as a truncated Fourier series. Three nonuniform power dividers are designed and one of them operating at frequencies 1.0, 2.8, and 4.5 GHz is fabricated and measured. The measured results of the fabricated diplexer have a good agreement with the theoretical results.
Separation Distance Reduction In Mimo Systems Using End-Fire Antenna Arrays, Amean Al_Safi
Separation Distance Reduction In Mimo Systems Using End-Fire Antenna Arrays, Amean Al_Safi
Amean S Al_Safi
The main problem in Multiple Input-Multiple Output (MIMO) systems is the separation distance between antennas which must be greater than or equal to half wavelength. Satisfying this separation is difficult or impossible especially at mobile communication, therefore this paper study the capability to reduce these separation distance by using End-Fire antenna arrays. Each antenna at the transmitter and receiver side is replaced by a set of antennas work as an array with a radiation pattern directed toward the axes of the arrays. The separation between elements in these arrays is fixed at quarter wavelength in order to have one main …
Voltage Impulse Induced Bistable Magnetization Switching In Multiferroic Heterostructures, Tianxiang Nan
Voltage Impulse Induced Bistable Magnetization Switching In Multiferroic Heterostructures, Tianxiang Nan
Tianxiang Nan
We report on voltage impulse induced reversible bistable magnetization switching in FeGaB/lead zirconate titanate (PZT) multiferroic heterostructures at room temperature. This was realized through strain-mediated magnetoelectric coupling between ferroelectric PZT and ferromagnetic FeGaB layer. Two reversible and stable voltage-impulse induced mechanical strain states were obtained in the PZT by applying an electric field impulse with its amplitude smaller than the electric coercive field, which led to reversible voltage impulse induced bistable magnetization switching. These voltage impulse induced bistable magnetization switching in multiferroic heterostructures provides a promising approach to power efficient bistable magnetization switching that is crucial for information storage.
Performance Of Polarization Diversity In A Linear Array Antenna, Amean S. Al_Safi
Performance Of Polarization Diversity In A Linear Array Antenna, Amean S. Al_Safi
Amean S Al_Safi
Multiple antennas systems require a separation distance between these antennas greater than or equal half wavelength. In this paper, we study the ability to reduce these separation distance by virtue of polarization diversity, i.e each two adjacent antenna replaced by one dual polarized antenna .The obtained results show that the use of polarization will reduce the required separation distance between antennas and the performance will be best, and these improvement will be more useful at the systems with greater number of antennas, increasing the correlation between antennas due to the separation angle will reduce the channel capacity. The results also …