Index Catalog // ScholarsArchive@OSU

Characterization of fatigue-induced free volume changes in bulk metallic glass using positron annihilation spectroscopy

Creator:: Vallery, R. S., Liu, M., Gidley, D. W., Launey, M. E., and Kruzic, J. J.
Abstract:: Depth-profiled Doppler broadening spectroscopy of positron annihilation on the cyclic fatigue-induced fracture surfaces of three amorphous Zr₄₄Ti₁₁Ni₁₀Cu₁₀Be₂₅ metallic glass specimens reveals the presence of a 30–50 nm layer of increased free volume that is generated by the propagating fatigue crack tip. The presence and character of this fatigue transformation zone...
Resource Type:: Article
Full Text:: 2007; published online 26 December 2007" Depth-profiled Doppler broadening spectroscopy of positron

Microwave backscattering from surf zone waves

Creator:: Catalán, Patricio A., Haller, Merrick C., and Plant, William J.
Abstract:: The microwave backscatter properties of surf zone waves are analyzed using field observations. By utilizing a preexisting, independent, water surface discrimination technique, the microwave returns were extracted along individual waveforms and the data from shoaling (steepening) waves, surf zone breaking waves, and remnant foam were separated and quantified. In addition,...
Resource Type:: Article
Full Text:: broadening of the Doppler spectra and mean scatterer velocities that correlate well with the carrier wave

Optically stabilized diode laser using high-contrast saturated absorption

Creator:: Cuneo, Christopher J.
Abstract:: Doppler-free saturation spectroscopy in an optically thick atomic vapor is used in an optical-feedback configuration for two semiconductor diode laser systems. One laser system consists of an unmodifed, commercially available diode laser. The other laser system consists of a diode laser initially stabilized by optical feedback from a diffraction grating....
Resource Type:: Masters Thesis
Full Text:: Saturated Absorption . Abstract approved: David H. McIntyre Doppler-free saturation spectroscopy in an

Conversion of laser phase noise to amplitude noise in a Lummer-Gehrcke interferometer and in oxygen gas

Creator:: Wichner, Brian D.
Abstract:: In order to observe laser phase noise, this noise must be converted to amplitude noise, which can be achieved using either an interferometer or an absorption resonance in an atomic/molecular vapor or gas. When phase noise is converted to amplitude noise, it is manifested as a heterodyne signal in the...
Resource Type:: Dissertation
Full Text:: other workers, predicts the intensity fluctuations from a Doppler-broadened, two-level atomic/molecular

Observations and modeling of coastal internal waves driven by a diurnal sea breeze

Creator:: Lerczak, James A., Hendershott, M. C., and Winant, C. D.
Abstract:: During the Internal Waves on the Continental Margin (IWAVES) field experiments of 1996 and 1997 off of Mission Beach, California (32.75° N), we observed energetic, dirunal-band motions across the entire study site in water depths ranging from 15 to 500 m and spanning a cross-shore distance of 15 km. The...
Resource Type:: Article
Full Text:: broadening. This study suggests that continental margins in the vicinity of the 30 ø latitude (where av• = f

Modification of Long Equatorial Rossby Wave Phase Speeds by Zonal Currents

Creator:: Durland, Theodore S., Samelson, Roger M., Chelton, Dudley B., and de Szoeke, Roland A.
Abstract:: Previously unaddressed aspects of how equatorial currents affect long Rossby wave phase speeds are investigated using solutions of the shallow-water equations linearized about quasi-realistic currents. Modification of the background potential vorticity (PV) gradient by curvature in the narrow equatorial currents is shown to play a role comparable to the Doppler...
Resource Type:: Article
Full Text:: a role comparable to the Doppler shift emphasized by previous authors. The important vari- ables

Relative lifetime measurements of ¹⁹²Hg and ¹⁹³Hg superdeformed bands

Creator:: Busse, Brian Craig
Abstract:: Relative lifetimes, and the closely related quadrupole moments (Q[subscript]i values), of the six superdeformed (SD) bands in ¹⁹³Hg and the yrast SD band in ¹⁹²Hg were determined by a Doppler-shift attenuation method measurement. The experiment was performed using the Gammasphere array and Lawrence Berkeley National Laboratory's 88-inch Cyclotron. The Q[subscript]i...
Resource Type:: Dissertation
Full Text:: were determined by a Doppler-shift attenuation method measurement. The experiment was performed

Low-velocity matter wave source for atom interferometry produced by Zeeman-tuned laser cooling and magneto-optic trapping

Creator:: Mayer, Shannon K.
Abstract:: A continuous, low-velocity, nearly monochromatic atomic beam is created using laser cooling and two-dimensional magneto-optic trapping. Rubidium atoms from an effusive oven are slowed and cooled using Zeeman-tuned slowing. The scattering force from a counter-propagating, frequency-stabilized diode laser beam is used to decelerate the thermal beam of atoms to a...
Resource Type:: Dissertation
Full Text:: motion are designated collision broadening and Doppler broadening. Collision broadening results from

A study of positive cloud-to-ground lightning flashes in mesoscale convective systems

Creator:: Lu, Chungu
Abstract:: This study is mainly concentrated on examining the positive cloud-to-ground lightning activity associated with Mesoscale Convective Systems. Six MCS events which occurred during the O.K. PRE-STORM program in 1985 are studied. Data indicating the location and polarity of the cloud-to-ground lightning flashes from a lightning location network are analyzed in...
Resource Type:: Masters Thesis
Full Text:: -situ charging mechanism. Analysis of wind fields from dual-Doppler radar In combination with vertical

Effects of atmospheric pressure on line widths and spatial distributions of the transient atomic absorption signals of minor constituents in metal samples atomized by a dye laser microprobe

Creator:: Manabe, Ronald M.
Abstract:: Investigations of plasma production by a pulsed dye laser microprobe were made. Comparisons between a Q- switched and a pulsed dye laser system were made on the intensity of the continuum produced by atmospheric breakdown. The dye laser system was foundtominimize the production of the continuum which in turn allowed...
Resource Type:: Dissertation
Full Text:: Doppler Broadening to the Absorption Line Profile 118 G. Production of Microsecond Duration Hollow

ScholarsArchive@OSU

Characterization of fatigue-induced free volume changes in bulk metallic glass using positron annihilation spectroscopy

Microwave backscattering from surf zone waves

Optically stabilized diode laser using high-contrast saturated absorption

Conversion of laser phase noise to amplitude noise in a Lummer-Gehrcke interferometer and in oxygen gas

Observations and modeling of coastal internal waves driven by a diurnal sea breeze

Modification of Long Equatorial Rossby Wave Phase Speeds by Zonal Currents

Relative lifetime measurements of ¹⁹²Hg and ¹⁹³Hg superdeformed bands

Low-velocity matter wave source for atom interferometry produced by Zeeman-tuned laser cooling and magneto-optic trapping

A study of positive cloud-to-ground lightning flashes in mesoscale convective systems

Effects of atmospheric pressure on line widths and spatial distributions of the transient atomic absorption signals of minor constituents in metal samples atomized by a dye laser microprobe

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