Results 221 to 230 of about 95,566 (266)
Some of the next articles are maybe not open access.
Relative Spectral Attenuation Coefficients of Water
Applied Optics, 1967The relative variation of attenuation coefficient with wavelength has been studied in the laboratory for distilled water and seawater. The study was for the purpose of locating any very fine structure in the attenuation vs wavelength curve. The spectral region from 3750 A to 6850 A was examined with 0.2 A resolution; water paths were 9.7 m and 19.5 m ...
L F, Drummeter, G L, Knestrick
openaire +2 more sources
Estimation of the Slope of the Acoustic Attenuation Coefficient
Ultrasonic Imaging, 1984In this paper, a theoretical framework is developed which removes the Gaussian assumption commonly used in ultrasonic attenuation estimation based on mean frequency shift. The theory is developed for general non-Gaussian spectra and for media whose attenuation coefficient is nonlinear with frequency.
S, Shaffer +3 more
openaire +2 more sources
Mass-attenuation coefficients of beta particles
International Journal of Radiation Applications and Instrumentation. Part A. Applied Radiation and Isotopes, 1990Abstract A method to obtain mass-attenuation coefficients of β particles is described. This method is based upon the simulation of β emission by means of the β energy spectrum. The range of the β particle is chosen as random incidence by means of range distribution of monoenergetic electrons which have the same energy as the β particle.
CENGIZ, AHMET, OZMUTLU, C
openaire +2 more sources
An accurate parametrisation of the X-ray attenuation coefficient
Physics in Medicine & Biology, 1980A parametrisation starting from the fundamental theory of photon-electron interactions has been devised. In this note the authors report the expression obtained and the accuracy achieved for elements common in tissue and contrast media.
D J, Hawkes, D F, Jackson
openaire +2 more sources
Attenuation and reflection coefficient nomogram
Ultrasonics, 1974Abstract A nomogram is described for the determination of the sound pressure reflection coefficient R and the round-trip loss 2 α L when using the pulse-echo buffer rod technique.
openaire +1 more source
MEASUREMENT OF ATTENUATION COEFFICIENTS IN NATURAL WATER COLUMNS
Environmental Toxicology and Chemistry, 1987Abstract Light scattering and light absorption by particulates and humic substances in natural waters can significantly affect the photoreaction rates of chemicals in aquatic systems. These scattering and absorption processes are quantitatively described by the use of an empirical parameter, the diffuse attenuation coefficient, K.
John S. Winterle +2 more
openaire +1 more source
An Anisotropic Modelling for the Determination of Regional Attenuation Coefficients
Natural Hazards, 1998The anisotropic attenuation of macroseismic intensity for a seismogenetic zone is dealt with using a new modelling of intensity distribution. The analysis, carried out starting from the intensity maps of the earthquakes of different seismogenetic zones of Central and Southern Italy, allows the determination of the attenuation coefficients for each ...
TERAMO, Antonio +3 more
openaire +2 more sources
Attenuation Coefficient: Finite or Infinitesimal?
Physics in Medicine & Biology, 1966openaire +2 more sources