Results 171 to 180 of about 197,522 (217)

The sonar equation and the definitions of propagation loss

The Journal of the Acoustical Society of America, 2003
A rigorous application of the traditional definition of sonar equation terms leads to the appearance of an unexpected factor, not routinely included, equal to the ratio of the characteristic impedance at the receiver to that at the source. An omission of this factor can lead to non-negligible errors for realistic conditions. It is further argued that a
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Anomalous Propagation Loss in Photonic Crystal Waveguides

Physical Review Letters, 2004
Propagation loss can occur in photonic crystal waveguides without complete optical confinement. We employ a highly efficient transfer-matrix method which allows for accurate and reliable extraction of the propagation loss even at an extremely low level.
Zhi-Yuan, Li, Kai-Ming, Ho
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Direct measurement of propagation losses in silver nanowires

Optics Letters, 2010
We demonstrate a simple, direct measurement of propagation losses in single silver nanowires. Using a waveguiding nanoscale fiber taper for highly efficient launching, propagation surface plasmon polaritons are excited in the silver nanowire with high efficiency. The output intensity as light radiation at the end of the nanowire is quantified with high
Yaoguang, Ma, Xiyuan, Li, Huakang, Yu, Limin, Tong, Ying, Gu, Qihuang, Gong   +5 more
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The Impact of Loss on Ultrasound Propagation

2002
A marked feature of ultrasound propagation in most biological tissues is the frequency-dependent loss suffered by the pulse. The measurement of this parameter is generally accepted to be an important tissue parameter, but many artefacts, in particular those due to diffraction effects, compromise such an approach towards tissue characterisation.
Sidney Leeman, Andrew J. Healey, Eduardo T. Costa   +2 more
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MIMO radar detection with heterogeneous propagation losses

2012 IEEE Statistical Signal Processing Workshop (SSP), 2012
A multiple-input multiple-output (MIMO) radar can utilize distributed antennas to improve detection performance. Some existing works model bistatic path gains as identically and independently distributed random variables, and the known distinct features between propagation paths are neglected.
Xiufeng Song, Peter Willett 0001, Shengli Zhou 0001, Joseph Glaz   +3 more
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Propagation analysis of MIMO ad hoc network in hybrid propagation model and implement less propagation loss algorithm to find the minimum loss route

International Journal of Information and Communication Technology, 2017
Developing applications, especially real time ones mobile ad hoc network MANET requires a reasonable assurance of the likely performance of the network. MANET is realised by mobile nodes which communicate difficult task. Amongst many important properties of radio propagation model has to be selected carefully.
Swati Chowdhuri, Sayan Chakraborty, Nilanjan Dey, Sheli Sinha Chaudhuri, Pranab Banerjee   +4 more
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Propagation Delay and Loss Analysis for Bacteria-Based Nanocommunications

IEEE Transactions on NanoBioscience, 2016
Flagellated bacteria have been suggested as one of the means to deliver information at nanoscales due to their ability to store massive amounts of data in their DNA strands and their mobility properties. In this paper, the propagation delay and message loss rates are mathematically derived for bacterial nanocommunications.
Petrov V., Moltchanov D., Akyildiz I.F., Koucheryavy Y.   +3 more
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Prediction of urban propagation loss

IEEE Transactions on Antennas and Propagation, 1994
Two significantly different methods to calculate the path loss in urban areas are investigated in order to test their applicability to predicting the received power of a broadband DAB signal for mobile reception. The results were verified by broadband measurements of the received power in a DAB single-frequency network recently installed in Munich ...
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VLF propagation loss to a buried seismometer

IEEE Journal of Oceanic Engineering, 1988
The propagation loss from a shallow underwater explosion to a buried vertically polarized seismometer over the frequency band between 3 and 15 Hz was measured during the 1983 Ngendei Experiment. The data was recorded in 5.5-km-deep water in the southwest Pacific with a triaxial borehole seismograph emplaced 50 m within the basaltic basement.
T.J. Sereno, W.E. Farrell, J.A. Orcutt, R.G. Adair   +3 more
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Reduction of Propagation Losses in Coplanar Waveguide

MTT-S International Microwave Symposium Digest, 2005
Coplanar Waveguide (CPW) is finding increasing use in microwave and millimeter wave integrated circuits. CPW has several advantages over microstrip, but its ohmic loss tends to be larger because of the concentration of its currents near the metal edges. Two methods for reducing ohmic loss in CPW are proposed and studied using a numerical technique.
D.F. Williams, S.E. Schwarz
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