Results 351 to 360 of about 1,692,699 (370)

Simultaneous phase and amplitude extraction from a single defocused image of a homogeneous object

Journal of Microscopy, 2002
We demonstrate simultaneous phase and amplitude extraction from a single defocused image of a homogeneous object. Subject to the assumptions explicitly stated in the derivation, the algorithm solves the twin‐image problem of in‐line holography and is ...
D. Paganin, S. Mayo, T. Gureyev, P. Miller, S. Wilkins   +4 more
semanticscholar   +1 more source

Amplitude-only versus amplitude-phase estimation

IEEE Transactions on Instrumentation and Measurement, 1990
The feasibility of transfer function estimation based on amplitude-only measurements is investigated, and this method is compared with the amplitude-phase (full complex spectrum) method. It is shown that the amplitude-only-based method is a feasible alternative to the full complex spectrum method when the minimum in-phase transfer function of the ...
Rolain, Yves, Pintelon, Rik, Schoukens, Joannes   +2 more
openaire   +4 more sources

Full‐Polarization 3D Metasurface Cloak with Preserved Amplitude and Phase

Advances in Materials, 2016
A full-polarization arbitrary-shaped 3D metasurface cloak with preserved amplitude and phase in microwave frequencies is experimentally demonstrated.
Yihao Yang, L. Jing, B. Zheng, R. Hao, Wenyan Yin, Erping Li, C. Soukoulis, Hongsheng Chen   +7 more
semanticscholar   +1 more source

Offset‐amplitude variation and controlled‐amplitude processing

GEOPHYSICS, 1985
The partition of plane seismic waves at plane interfaces introduces changes in seismic amplitude which vary with angle of incidence. These amplitude variations are a function of the elastic parameters of rocks on either side of the interface. Controlled‐amplitude processing is designed to obtain the true amplitude information which is geologic in ...
openaire   +3 more sources

Large Amplitude Elastic Motions in Proteins from a Single-Parameter, Atomic Analysis.

Physical Review Letters, 1996
Normal mode analysis (NMA) is a leading method for studying long-time dynamics and elasticity of biomolecules. The method proceeds from complex semiempirical potentials characterizing the covalent and noncovalent interactions between atoms.
M. Tirion
semanticscholar   +1 more source

Modification of Empirical Strong Ground Motion Attenuation Relations to Include the Amplitude and Duration Effects of Rupture Directivity

, 1997
Rupture directivity effects cause spatial variations in ground motion amplitude and duration around faults and cause differences between the strike-normal and strike-parallel components of horizontal ground motion amplitudes, which also have spatial ...
P. Somerville, N. Smith, R. Graves, N. Abrahamson   +3 more
semanticscholar   +1 more source

Effect of Memory for Amplitude on Amplitude Discrimination

The Journal of the Acoustical Society of America, 1959
A two alternative forced-choice experiment (2 AFC) in which the observer is asked to state which is the larger of two segments of tones presented sequentially in time, is analyzed as an experiment involving only amplitude memory. Frequency, phase, starting time, and duration information is provided each trial by the stimuli.
openaire   +2 more sources

P300 Amplitude in Alzheimer’s Disease

Clinical EEG and Neuroscience, 2016
Alzheimer’s disease accounts for 60% of all dementia. Numerous biomarkers have been developed that can help in making an early diagnosis. The P300 is an event-related potential that may be abnormal in Alzheimer’s disease.
D. Hedges, Rebecca Janis, Stephen Mickelson, C. Keith, D. Bennett, B. Brown   +5 more
semanticscholar   +1 more source

Quantitative measurements of vibration amplitude using a contact-mode freestanding triboelectric nanogenerator.

ACS Nano, 2014
A vibration sensor is usually designed to measure the vibration frequency but disregard the vibration amplitude, which is rather challenging to be quantified due to the requirement of linear response.
Sihong Wang, Simiao Niu, Jin Yang, Long Lin, Zhong Lin Wang   +4 more
semanticscholar   +1 more source

Complex-amplitude metasurface-based orbital angular momentum holography in momentum space

Nature Nanotechnology, 2020
H. Ren, Xinyuan Fang, J. Jang, J. Bürger, J. Rho, S. Maier   +5 more
semanticscholar   +1 more source