Results 131 to 140 of about 6,360,569 (404)

Reconfigurable radio-frequency arbitrary waveforms synthesized in a silicon photonic chip

Nature Communications, 2015
Photonic methods of radio-frequency waveform generation and processing can provide performance advantages and flexibility over electronic methods due to the ultrawide bandwidth offered by the optical carriers.
Jian Wang, Hao Shen, Li Fan, Rui Wu, B. Niu, L. Varghese, Yi Xuan, D. Leaird, Xi Wang, Fuwan Gan, Andrew M. Weiner, Minghao Qi   +11 more
semanticscholar   +1 more source

White Christian Nationalism in the Rural United States

New Directions for Adult and Continuing Education, EarlyView.
ABSTRACT Many scholars have sought to link the rise of right‐wing populist movements, like White Christian Nationalism (WCN), to the impacts of political‐economic structural changes, such as globalization and financialization. Although these structural changes may explain some grievances, they do not explain why people express those grievances in the ...
Leland L. Glenna
wiley   +1 more source

The low-frequency radio catalog of flat spectrum sources

, 2014
A well known property of the gamma-ray sources detected by COS-B in the 1970s, by the Compton Gamma-ray Observatory in the 1990s and recently by the Fermi observations is the presence of radio counterparts, in particular for those associated to ...
,, /INAF-IRA, Bologna, /INAF-IRA, Bologna /Harvard-Smithsonian Ctr. Astrophys., /SLAC /KIPAC, Menlo Park, /SLAC /KIPAC, Menlo Park, Astrophys., /Harvard-Smithsonian Ctr., Cowperthwaite, Philip S., D'Abrusco, R., Funk, S., Giroletti, M., Masetti, N., Massaro, F., Paggi, A., Tosti, G.   +13 more
core   +2 more sources

Topological transition of Pancharatnam–Berry phase in a nonlocal twisted bilayer metasurface

Scientific Reports
The Pancharatnam-Berry (PB) phase principle has been extensively utilized in the design of polarization-dependent, ultrathin, phase-gradient metasurfaces, where the PB phase shift is determined by twice the change in orientation angle of individual ...
Yongqing Huang, Yachao Liu, Mingwei Wang, Xiandi Chen, Haoliang Han, Aofei Yu, Guo Ping Wang   +6 more
doaj   +1 more source

Enhanced analysis of gating latency in 0.35T MR‐linac through innovative time synchronization of a motion phantom and plastic scintillation detector

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This study aims to evaluate how different gantry angles, breathing rates (BPM), cine image speeds, and tracking algorithms affect beam on/off latency and the subsequent impact on target dose for a 0.35T MR‐Linac with a 6 MV FFF beam.
Mateb Al Khalifa, Tianjun Ma, Haya Aljuaid, Siyong Kim, William Y. Song   +4 more
wiley   +1 more source

Monolayer Chiral Metasurface for Generation of Arbitrary Cylindrical Vector Beams

Photonics
The cylindrical vector beam (CVB) has been widely studied and applied in recent years. However, many CVB generation methods suffer from complex systems, and large-size devices are required. Here, we propose a monolayer chiral metasurface composed of spin-
Qian Chen, Peijun Liu, Yanan Fu, Shuoshuo Zhang, Yuquan Zhang, Xiaocong Yuan, Changjun Min   +6 more
doaj   +1 more source

Radio Emission from Exoplanets [PDF]

arXiv, 2008
We present results from new low frequency observations of two extrasolar planetary systems (Epsilon Eridani and HD128311) taken at 150 MHz with the Giant Metrewave Radio Telescope (GMRT). We do not detect either system, but are able to place tight upper limits on their low frequency radio emission.
arxiv  

Energy dependence of the GAFCHROMIC LD‐V1 in the diagnostic radiographic modalities

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract The GAFCHROMIC LD‐V1 radiochromic film is widely used in dosimetry because it can provide high‐resolution two‐dimensional dose distributions without processing. This study aimed to evaluate the response characteristics at different effective energies, from the low‐energy range of mammography to the high‐energy range of computed tomography. Net
Tatsuhiro Gotanda, Tomoyuki Hasuo, Shinnosuke Nishihara, Kohsei Matsuura, Yasuyuki Kawaji, Hidetoshi Yatake, Shinya Imai, Takuya Akagawa, Nobuyoshi Tanki, Toshizo Katsuda   +9 more
wiley   +1 more source

The radio spectra of reddened 2MASS QSOs: evidence for young radio jets [PDF]

, 2012
Multifrequency radio continuum observations (1.4-22 GHz) of a sample of reddened QSOs are presented. We find a high incidence (13/16) of radio spectral properties, such as low frequency turnovers, high frequency spectral breaks or steep power-law slopes,
Afonso, J., Georgakakis, A., Grossi, M., Hopkins, A. M.   +3 more
core  

Mantle cloaking for co-site radio-frequency antennas

, 2016
We show that properly designed mantle cloaks, consisting of patterned metallic sheets placed around cylindrical monopoles, allow tightly packing the same antennas together in a highly dense telecommunication platform.
A. Monti, J. Soric, M. Barbuto, D. Ramaccia, S. Vellucci, F. Trotta, A. Alú, A. Toscano, F. Bilotti   +8 more
semanticscholar   +1 more source