Results 21 to 30 of about 8,935,486 (331)
Improved Separation of Tone and Broadband Noise Components from Open Rotor Acoustic Data
Aerospace, 2016 The term “open rotor” refers to unducted counter-rotating dual rotors or propellers used for propulsion. The noise generated by an open rotor is very complicated and requires special techniques for its analysis.
Dave Sree, David B. Stephens
doaj +1 more source
Phase effect in time-stamped accelerometer measurements – an experimental approach [PDF]
International Journal of Metrology and Quality Engineering, 2012 The phase error in a high quality accelerometer was investigated on the basis of systematic experiments on a prototype platform permitting controlled vertical harmonic oscillations.
Moschas F., Stiros S.
doaj +1 more source
IEEE Access, 2021 The scattered resistive elements residing in a dual-active-bridge (DAB) dc/dc converter can adversely affect its transient performance especially when the load change is large.
Jian Yin +4 more
doaj +1 more source
Performance Analysis of Hybrid Phase Shift Keying over Generalized Nakagami Fading Channels
Journal of Telecommunications and Information Technology, 2023 In addition to the benefits of hybrid phase shift keying (HPSK) modulation in reducing the peak to average power ratio of the transmitted signal to reduce the zero cross- ings and the 0◦-degree phase transmissions, HPSK enhances the bit error rate (BER)
Mahmoud Youssuf , Mohamed Z. Abdelmageed
doaj +3 more sources
Chemical Sensing Using Fiber Cavity Ring-Down Spectroscopy
Sensors, 2010 Waveguide-based cavity ring-down spectroscopy (CRD) can be used for quantitative measurements of chemical concentrations in small amounts of liquid, in gases or in films.
Hans-Peter Loock +4 more
doaj +1 more source
IEEE Photonics Journal, 2018 We demonstrate a phase-shifted fiber Bragg grating with a taper induced by femtosecond laser micromachining. In this configuration, a fiber taper fabricated by an arc discharge in a fiber splicer was sandwiched between two fiber Bragg grating sections ...
Feng Zhu +9 more
doaj +1 more source
Retrieval of Gap Fraction and Effective Plant Area Index from Phase-Shift Terrestrial Laser Scans
Remote Sensing, 2014 The characterization of canopy structure is crucial for modeling eco-physiological processes. Two commonly used metrics for characterizing canopy structure are the gap fraction and the effective Plant Area Index (PAIe).
Pyare Pueschel +2 more
doaj +1 more source
Geometric phase for a dimerized disordered continuum: Topological shot noise [PDF]
, 1998 Geometric phase shift associated with an electron propagating through a dimerized-disordered continuum is shown to be 0, or $\pm \pi$ (modulo 2$\pi$), according as the associated circuit traversed in the two-dimensional parameter space excludes, or ...
Berry M. V. +4 more
core +2 more sources
IEEE Access, 2017 High-frequency pulsating dc-link inverter has higher power density than the conventional fixed dc-link inverter (FDCLI), and more complicate modulation methods owing to the coupling between the front end and the last stage links.
Lijun Diao +5 more
doaj +1 more source
Gouy phase compensation in quasi-phase matching [PDF]
, 2008 In any focussed nonlinear interaction the focus induced phase shift, known as the Gouy phase shift, provides an imperfection in phase matching for any linearly invariant material.
Belmonte +8 more
core +1 more source