Now showing items 12544-12563 of 12981

• #### Ultrafast and magneto-optical spectroscopy of excitons and phonons in carbon nanotubes ﻿

(2010)
Understanding how electrons and phonons relax in energy and momentum is one of the current goals in carbon nanotube spectroscopy as well as an important step toward developing novel electronic and optoelectronic devices ...
• #### Ultrafast and magneto-optical spectroscopy of semiconductor heterostructures ﻿

(2012)
This thesis presents spectroscopic results using semiconductor heterostructures important for both applied and fundamental physics. First, we studied short-period superlattices of InAs and GaSb that suggest a promising ...
• #### Ultrafast carrier relaxation in solid buckminsterfullerene ﻿

(1994)
The time dependence of the carrier relaxation in undoped solid C$\sb{60}$ thin films has been studied by monitoring changes in the optical transmission upon photoexcitation using sub picosecond laser pulses at 2 eV. Optical ...
• #### Ultrafast electron dynamics in gold nanoshells ﻿

(2001)
In metallic nanostructures, the interaction of excited electrons with the nanostructure surface may result in electron relaxation dynamics that are significantly different than those predicted by electron-lattice coupling. ...
• #### Ultrafast magneto-optical spectroscopy of (III,manganese)V ferromagnetic semiconductors ﻿

(2005)
This thesis describes magneto-optical processes in ferromagnetic (III,Mn)V semiconductors and their heterostructures induced by femtosecond laser pulses. Two-color ultrafast magneto-optical spectroscopy has been developed, ...
• #### Ultrafast optical spectroscopy of single-walled carbon nanotubes ﻿

(2004)
Wavelength-dependent, near-infrared pump-probe study of micelle-suspended Single-Walled Carbon Nanotubes (SWCNTs) whose linear absorption spectra show chirality-assigned peaks is presented. Two distinct relaxation regimes ...
• #### Ultrafast Spectroscopy in High Magnetic Fields Using a Mini-coil Pulsed Magnet ﻿

(2013-04-19)
We have developed a unique magneto-optical system combining intense ultrashort laser pulses, low temperatures, and high magnetic fields up to 30 T with a table-top pulsed mini-coil magnet. With this unique system, we ...
• #### Ultrafast Spectroscopy of (6,5) Carbon Nanotubes ﻿

(2020-02-03)
Single-wall carbon nanotubes (SWCNTs) represent an exemplary model system for studying one-dimensional (1-D) physics in condensed matter research. Conceptually, they can be presented as a rolled-up sheet of graphene, and ...
• #### Ultralong-Range Molecules and Rydberg Blockade in Ultracold 84Sr ﻿

(2015-07-30)
My dissertation describes experiments on two-photon excitation of ultracold Sr to the 3S1 Rydberg series and represents the first experiments exciting Rydberg atoms via an intermediate triplet excited state. Due to the ...
• #### Ultralow-IFT Foam for Enhanced Oil Recovery in Naturally Fractured Oil-wet Carbonate Reservoirs ﻿

(2018-08-10)
Oil recovery in heterogeneous carbonate reservoirs is typically inefficient because of the existence of high-permeability fracture networks and unfavorable capillary forces within the oil-wet matrix. This thesis demonstrates ...
• #### Ultrashort Single-walled Carbon Nanotubes: A Platform for Medical Imaging and Therapy ﻿

(2015-04-21)
Ultra-short single-walled carbon nanotubes (US-tubes) have been used to encapsulate various metal ions and small molecules for both diagnostic and therapeutic applications. Of the US-tube derivatives, one of the best ...

(1971)
• #### Ultrasonic attenuation in single crystals of aluminum potassium sulfate dodecahydrate and aluminum ammonium sulfate dodecahydrate as a function of frequency and temperature ﻿

(1962)
Because of suggestions that at least some alum crystals may become ferroelectric at low temperatures, and that a ferroelectric crystal would show anomalies in the absorption of sound, the attenuation of 10, 30 and 50 M.c. ...
• #### Ultrasonic attenuation measurements in superconducting metals ﻿

(1950)
Abstract Not Available.

(1978)

(1949)
• #### Ultrasonic velocity measurements on potassium chrome alum ﻿

(1953)
The velocity of propagation of longitudinal sound waves in a single crystal of potassium chrome alum was measured as a function of temperature. The waves were propagated normal to the (1,1,1) plane. In the temperature ...
• #### Ultrasound technique for tissue differentiation ﻿

(1990)
Pressure sores are a serious medical problem, which cause a great deal of economic and physical damage. The old method of skin color identification is not quantitative and is usually unreliable. Among various methods which ...
• #### Ultrathin and Tunable Graphene Oxide Membranes for Pressure Driven Water Filtration ﻿

(2016-04-26)
The emerging 2D material, graphene oxide (GO), provides an ideal substitute to overcome many major issues of water treatment membranes. The performance of GO membranes can be adjusted by controlling the interlayer spacing, ...
• #### Ultrathin Chalcogens ﻿

(2018-10-10)
Two-dimensional (2D) materials, which are only one or a few atoms thick, can possess exciting and tunable optical/electronic properties unique from their 3D counterparts, providing a platform to tailor physics through ...