Results 11 to 20 of about 4,724,423 (285)

Spectrum utilization using game theory [PDF]

open access: yes, 2010
This thesis was submitted for the degree of Master of Philosophy and awarded by Brunel University.Spectrum utilization is the most recent communications issue which takes great deal of attention from communication researchers where most of the efforts ...
Al-Banna, Zaineb
core   +7 more sources

The characteristics of continuous gravity changes in Qiongzhong seismic station

open access: yes地震科学进展, 2020
This paper collected the continuous gravity observation data from Qiongzhong seismic station since 2009. After processing the raw data with sudden jumps,steps and error data,we calculated and analyzed the characteristics of the gravity tide data from ...
Jialin Wu   +5 more
doaj   +1 more source

Modelling and Study of the Effect of Geometrical Parameters of Piezoelectric Plate and Stack

open access: yesApplied Sciences, 2021
The piezoelectric stack is employed as an actuator and a sensor in a variety of technical applications. The dynamic modelling of piezoelectric plates and stack is used to investigate and search for new applications in mechatronics systems that are based ...
Tolera G. Degefa   +2 more
doaj   +1 more source

The Application of Frequency Offset Advantage (FOA) in Frequency Coordination

open access: yes, 1979
International Telemetering Conference Proceedings / November 19-21, 1979 / Town and Country Hotel, San Diego, CaliforniaA major telecommunications growth area at this time is narrowband digital transmissions via satellites.
Raghavan, Srini, Armes, Jerry
core   +4 more sources

Hawking spectrum and high frequency dispersion [PDF]

open access: yesPhysical Review D, 1996
We study the spectrum of created particles in two-dimensional black hole geometries for a linear, hermitian scalar field satisfying a Lorentz non-invariant field equation with higher spatial derivative terms that are suppressed by powers of a fundamental momentum scale $k_0$. The preferred frame is the ``free-fall frame" of the black hole.
Corley, S., Jacobson, T.
openaire   +3 more sources

Acoustic frequency spectrum characteristics in periodic drill string under tension

open access: yesEnergy Science & Engineering, 2020
It is a promising measure to transmit downhole information by acoustic wave through drill string. However, the transmission distance and quality of acoustic signals in field conditions are still not satisfied because the acoustic frequency spectrum in ...
Qing Wang, Zhichuan Guan, Yongwang Liu
doaj   +1 more source

The Site Frequency Spectrum for General Coalescents [PDF]

open access: yesGenetics, 2016
Abstract General genealogical processes such as Λ- and Ξ-coalescents, which respectively model multiple and simultaneous mergers, have important applications in studying marine species, strong positive selection, recurrent selective sweeps, strong bottlenecks, large sample sizes, and so on.
Spence, Jeffrey P   +2 more
openaire   +5 more sources

Is re-farming the answer to the spectrum shortage conundrum? [PDF]

open access: yes, 2008
Radio spectrum has become one of the engines of economic growth. However, rapid technological change, ever increasing demands for new wireless services and the nature of spectrum as a scarce resource necessitate an urgent re-examination of issues such as
Curwen, Peter   +2 more
core   +3 more sources

Modeling of Woodworkers’ Exposure to Occupational Noises by Integrating Frequency Spectra Generated by Power Tools: A Pilot Study

open access: yesApplied Sciences, 2020
Woodwork is one of the occupations with high levels of noises. This pilot study attempted to simulate woodworkers’ occupational noise exposure by integrating frequency spectra measured from individual power tools with the respective time of tool use ...
Yu-Ping Zheng   +2 more
doaj   +1 more source

Editorial Note: Impact of COVID-19 on Spectrum operations

open access: yes, 2020
To support our authors, reviewers and editors during the COVID-19 pandemic, the Spectrum Editorial Board has relaxed its timelines for the publication of this most recent issue (Issue 5).  We are working with our authors on their Issue 5 submissions,
Editorial Board, Spectrum
core   +1 more source

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