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.
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Showing 1 to 20 of 23 for “"D region"”.
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VLF instrumentation for ground-based D-region studies
National Aeronautics and Space Administration Grant NsG-511
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Stratospheric-mesospheric circulation patterns and D-region absorption.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1969.
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Midlatitude D Region Variations Measured from Broadband Radio Atmospherics
… of the lower ionosphere (<italic>D</italic> region) across the wave propagation path due to several reflections by the upper boundary (lower ionosphere) of the waveguide. This capability makes it possible to frequently and even continuously monitor the <italic>D</italic> region electron …
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An Investigation of the Ionospheric D Region at Sunrise
Made available in DSpace on 2014-12-10T19:06:45Z (GMT). No. of bitstreams: 1 7121255.pdf: 8967910 bytes, checksum: f97c0eb84e0bd073918d2d69c83d0319 (MD5) Previous issue date: 1971
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Small-scale fluctuations in D-region ionization due to hydrodynamic turbulence
The fluctuations at small length scales in V-region ionization caused by atmospheric turbulence are investigated. Consideration is given to the dynamics of the plasma, the statistical theory of turbulent advection, the relaxation to photochemical equilibrium, and the theoretical prediction of …
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An Investigation of the Solar Zenith Angle Variation of D-Region Ionization
Made available in DSpace on 2014-12-12T20:54:11Z (GMT). No. of bitstreams: 1 7524388.pdf: 10534958 bytes, checksum: 19e838b5db1871ef9ce723f7c39e64df (MD5) Previous issue date: 1975
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A preliminary discussion of D-region height fluctuations detected by reflecting 100 KHz radio waves.
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Geology and Geophysics, 1968.
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An Evaluation of the Partial-Reflection Technique and Results From the Winter 1971-1972 D Region
Made available in DSpace on 2014-12-10T19:07:22Z (GMT). No. of bitstreams: 1 7511687.pdf: 7258896 bytes, checksum: a28b28d4b329f11f6f728c837c587379 (MD5) Previous issue date: 1974
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Calibration of Jicamarca radar using F-region incoherent scatter for measurements of D-region backscatter RCS
This thesis presents calibrated radar measurements of absolute backscatter cross sections of mesospheric radar echoes observed at the Jicamarca Radio Observatory in Perú. Radar system calibration is accomplished by simulating the propagation of transmitted and backscattered radio waves through the …
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Investigation of the Winds and Electron Concentration Variability in the D Region of the Ionosphere by the Partial-Reflection Radar Technique
The development and first observations of the partial-reflection drifts experiment at Urbana, Illinois (40(DEGREES)N) are described. The winds data from the drifts experiment are compared with electron concentration data obtained by the differential-absorption technique to study the possible …
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The structure of a trailing vortex wake
… stress fields were found. Outside of the core region the turbulence structure is dominated by this spiral wake. The maximum turbulence levels exist in the part of of the wake that begins to spiral about the core. The 3-D region is the region where the wake is wound about the vortex and the 2-D …
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Imaging the D" Structure using Waveform Modelling
The D" region of the Earth, the lowermost few hundred kilometres of the lower mantle, is designated as a thermal boundary layer and chemically distinct layer above the core-mantle boundary (CMB). It plays an important role in mantle convection, core convection and the resulting geodynamics. …
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Imaging the D" Structure using Waveform Modelling
The D" region of the Earth, the lowermost few hundred kilometres of the lower mantle, is designated as a thermal boundary layer and chemically distinct layer above the core-mantle boundary (CMB). It plays an important role in mantle convection, core convection and the resulting geodynamics. …
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Alaskan stream circulation and exchanges through the Aleutian island passes 1979-2003 model results
d region, which is of relevance to Undersea Warfare.
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Solar flare effects observed over Jicamarca during MST-ISR experiments
… of incoherent scatter (IS) returns from F-region ionosphere and IS theory [Kudeki and Milla, 2011; Milla and Kudeki, 2011]. The present study focuses on the effects of six solar flare events observed to cause significant changes in the mesosphere and the thermosphere. The largest event in …
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Inverse scattering : theory and application to the imaging of the Earth's seismic discontinuities
… south Tibet and the core-mantle boundary (CMB) region beneath Central America and East Asia. First, we develop a new method, which we call passive source reverse time migration (RTM), for subsurface imaging with teleseismic array data. Multi-component array data are first propagated backward by …
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Birds/Bats Motion Tracking with Infrared Radiation Camera for Wind Farm Applications
… frame subtraction, frame selection, 3-D region labeling and breakpoint recovery. It has been simulated for performance evaluation. It is then used to process spring 2011 bird migration data that has been collected in Ottawa National Wildlife Refuge in Ohio. Results from this study will be …
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Characterization and Modeling of Solar Flare Effects in the Ionosphere Observed by HF Instruments
… intensity, and made some inferences about D-region ion-chemistry using a simulation study. Specifically, we found solar flares alter the D-region chemistry by enhancing the electron detachment rate due to a sudden rise in molecular vibrational and rotational energy under the influence of …
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Towards Establishing Methods of Synthesis, Purification, and Structural Determination for Human Fibrinogen
… in-solution structure of human fibrinogen's D region. This structure is currently the highest resolution structure of any fibrinogen domain obtained in the native, solution state and further supports evidence for fibrinogen's intrinsic flexibility, expanding the textbook representations of …
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Antibody active site contributions to fluorescein ligand binding
… V$\sb{\rm H}$III(C) genes were utilized. D region length and sequence variabilities were seen; however, compensatory J$\sb{\rm H}$4 (4-4-20 and 3-24) or J$\sb{\rm H}$3 sequence lengths resulted in HCDR3 + FR4 to be a constant 18 amino acids. Each Mab rearranged $>$95% homologous …
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