Results 11 to 20 of about 197,522 (217)
Measurement and Analysis of Extra Propagation Loss of Tunnel Curve [PDF]
IEEE Transactions on Vehicular Technology, 2016 Wave propagation experiences extra loss in curved tunnels, which is highly desired for network planning. Extensive narrow-band propagation measurements are made in two types of Madrid subway tunnels (different cross sections and curvatures) with various configurations (different frequencies and polarizations). A ray tracer validated by the straight and
Bo Ai, Ke Guan, Zhangdui Zhong
exaly +3 more sources
Transmission Loss in Radio Propagation
Proceedings of the IEEE, 1953 The utility of the concept of transmissionloss in radio-propagation analysis is explored. The transmission loss of a radio system is defined to be the ratio of the power radiated from the transmitting antenna to the resulting signal power available from a loss-free receiving antenna.
exaly +3 more sources
Simple VHF and UHF Propagation Loss model
IEEE Communications Letters, 2023 <p>In this letter, we present a mathematical characterization of the Federal Communication Commission (FCC) F(50,50) curve for the Very High Frequency (VHF) and the Ultra High Frequency (UHF) band. The proposed empirical model is based on a novel step-wise curve fitting the FCC signal strength data.
Thaisa Jawhly, Ramesh Chandra Tiwari
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Loss of Bin1 Promotes the Propagation of Tau Pathology [PDF]
Cell Reports, 2016 Tau pathology propagates within synaptically connected neuronal circuits, but the underlying mechanisms are unclear. BIN1-amphiphysin2 is the second most prevalent genetic risk factor for late-onset Alzheimer's disease. In diseased brains, the BIN1-amphiphysin2 neuronal isoform is downregulated.
Calafate, Sara +3 more
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Propagation of Gaussian Beams in the Presence of Gain and Loss [PDF]
IEEE Journal of Selected Topics in Quantum Electronics, 2016 We consider the propagation of Gaussian beams in a waveguide with gain and loss in the paraxial approximation governed by the Schrödinger equation. We derive equations of motion for the beam in the semiclassical limit that are valid when the waveguide profile is locally well approximated by quadratic functions.
Eva-Maria Graefe +2 more
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Theoretical prediction of propagation loss [PDF]
The Journal of the Acoustical Society of America, 1974 This paper takes a broad look at the problems and techniques involved in the theoretical prediction of propagation loss in the ocean. Most propagation loss models in current use are based on ray theory, because of the relative simplicity with which ray solutions can be obtained and computations performed, even for range-dependent environments. However,
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Protein pyrophosphorylation by inositol pyrophosphates — detection, function, and regulation
FEBS Letters, EarlyView.Protein pyrophosphorylation is an unusual signaling mechanism that was discovered two decades ago. It can be driven by inositol pyrophosphate messengers and influences various cellular processes. Herein, we summarize the research progress and challenges of this field, covering pathways found to be regulated by this posttranslational modification as ...
Sarah Lampe +3 more
wiley +1 more source
Propagation Losses of Slotted Photonic Crystal Waveguides
IEEE Photonics Journal, 2012 We have fabricated and characterized a set of slotted photonic crystal (SPhC) waveguides in silicon-on-insulator (SOI) with a length of up to 300 $\mu\hbox{m}$ and slot widths ranging between 115 and 145 nm. We observe an upper limit for the loss of 11 dB/cm.
A. Di Falco +5 more
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FEBS Letters, EarlyView.The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li +2 more
wiley +1 more source
Method for characterization of Si waveguide propagation loss
Optics Express, 2013 A new method for measuring waveguide propagation loss in silicon nanowires is presented. This method, based on the interplay between traveling ring modes and standing wave modes due to back-scattering from edge roughness, is accurate and can be used for on wafer measurement of test structures. Examples of loss measurements and fitting are reported.
Michele Moresco +8 more
openaire +2 more sources