Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 667 for “"scatter"”.
-
Rain depolarization scatter prediction
… from light to severe. General causes of output scatter are included, and the scatter induced by the rain drop size distribution is examined in detail. Predicted cross polarization variances in excess of 9 dB for certain frequencies are shown. This variance is significant in that it can easily …
-
An Investigation of Turbulent Scatter From the Mesosphere as Observed by Coherent-Scatter Radar
Turbulent scatter from the mesosphere is observed using the Urbana coherent-scatter radar. The variation in signal-to-noise ratio as a function of time-of-day is examined. The origin of scattering regions is investigated by comparing the variations in scattered power and Doppler velocity. Nighttime …
-
Rain scatter interference in satellite links
Scattering by rain in addition to inducing attenuation and depolarization in satellite links can create intersystem interference. This type of interference was investigated extensively in the 1970's for terrestrial links, but little has been done to study its effects on modern and future satellite …
-
Discomfort glare, light scatter, and scene structure
… of glare to impairment of vision caused by light scatter. Stiles (Stiles, (1929)) refuted Holladay's case by arguing that only a small proportion of the reduction in task visibility could be attributed to light scatter effects (where task visibility is a measure of how far above the visual …
-
Incoherent scatter modeling of Jicamarca radar spectra
… ionosphere probed by the Jicamarca Incoherent Scatter Radar (ISR) located near Lima, Peru. The topside equatorial ionosphere is a multi-ion plasma and the spectrum of its electron density irregularities can be modeled by extending the single-ion spectral model developed by Kudeki and Milla …
-
A scatter communications link at ultraviolet frequencies.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1968. B.S.
-
Limb scatter measurements of high altitude cloud distributions
… instrument measures the spectrum of sunlight scattered from the Earth's atmosphere at wavelengths from the ultraviolet (280 nm) to the near infrared (810 nm). The limb scattering measurement technique allows OSIRIS to collect information on the vertical profile of atmospheric chemical and …
-
Development of X-ray Coherent Scatter Projection Imaging Systems
Coherent scatter x-ray imaging systems are sensitive to material structure and chemical composition, and generate images with contrast superior to conventional transmission x-ray imaging. The goal of this thesis was to develop a scatter projection imaging system capable of acquiring images in less …
-
Modelling and Measurement of the Scatter of Microwaves by Buildings
… there could be more than one interference path. Scattered interference from other buildings in the vicinity of the site is one which can be found to be almost as harmful as the direct interference.<br/><br/>Although site shielding has long been identified as an interference reduction technique, …
-
Comparative assessment of several SPECT scatter correction methods using SimSPECT
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biology, 1997.
-
The scatter of fast neutral particles in a gas target
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1960
-
A porous elastic model for acoustic scatter from manganese nodules
… absorption into the previously developed scattering analysis for elastic spheres. Acoustic propagation in porous media has two distinct compressional modes, one in which the fluid and the structure move in phase with each other and the other in which they move in opposite phase. …
-
X-ray Scatter Computation and Simulation in Cone Beam Computed Tomography
… signal can be contaminated by a large amount of scattered photons due to x-ray interactions with the irradiated object. The photon scatter can severely degrade the quality of the reconstructed CT images by creating artifacts and quantification errors. Thus scatter correction has become an …
-
Influence of photospheric back-scatter on flare hard x-ray diagnostics.
… on the influence of solar photospheric back–scatter on Hard X–Ray (HXR) flare diagnostics. Specifically the thesis presented is concerned with the effect of back–scatter photons upon the morphology of the Hard X–Ray photon spectrum and its effect on the inferred parent electron spectrum. I …
-
Remote estimation of aquatic sediment density in the presence of scatter.
… the sediment, a considerable amount of noise or scatter is produced. The scattered energy is incoherent, and therefore removable through signal processing methods. These processing methods are tested for their effectiveness using synthetic data generated by a finite element model. Lastly, as a …
-
Remote Sensing of the Mesosphere Using the Jicamarca Incoherent-Scatter Radar
Made available in DSpace on 2014-12-12T20:54:10Z (GMT). No. of bitstreams: 1 7524387.pdf: 8450797 bytes, checksum: 0bec28cc661cc24643ef4e724614b8c6 (MD5) Previous issue date: 1975
-
Wind and Wave Observations in the Mesosphere Using Coherent-Scatter Radar
Made available in DSpace on 2014-12-12T20:55:04Z (GMT). No. of bitstreams: 1 8009008.pdf: 5671029 bytes, checksum: 9d8b82def0ec1c5e04a071a9dc039f37 (MD5) Previous issue date: 1979
-
Inversion of Arecibo incoherent scatter radar coded long pulse backscatter spectra
Incoherent scatter radar (ISR) at Arecibo Observatory measures the scattering of electromagnetic waves from random density fluctuations of ionospheric plasma particles (electrons and ions). Information about particle temperatures, ion concentrations, and Doppler shifts caused by particle motions …
-
The Scatter Dependence of the Spatially-Resolved Star Formation Main Sequence Relation
The scatter of the spatially-resolved star formation main sequence (SFMS) is investigated in order to reveal signatures about processes of galaxy formation and evolution. We have assembled a sample of 355 nearby galaxies with spatially-resolved Hα and mid-infrared fluxes from the Survey for Ionized …
Page 1 of 34