Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Engineering (308)
- Optics (297)
- Electrical and Computer Engineering (277)
- Electromagnetics and Photonics (269)
- Condensed Matter Physics (37)
-
- Biological and Chemical Physics (26)
- Atomic, Molecular and Optical Physics (24)
- Astrophysics and Astronomy (18)
- Life Sciences (17)
- Engineering Physics (16)
- Materials Science and Engineering (16)
- Other Physics (16)
- Fluid Dynamics (15)
- Mechanical Engineering (15)
- Education (11)
- Elementary Particles and Fields and String Theory (11)
- Oceanography and Atmospheric Sciences and Meteorology (11)
- Quantum Physics (11)
- Environmental Sciences (10)
- Biochemistry, Biophysics, and Structural Biology (9)
- Computer Sciences (9)
- Earth Sciences (9)
- Applied Mathematics (8)
- Biophysics (8)
- Mathematics (8)
- Chemical Engineering (7)
- Science and Mathematics Education (7)
- Semiconductor and Optical Materials (7)
- Institution
- Keyword
-
- Physics and Astronomy (21)
- Nonlinear optics (18)
- Optics (16)
- College of Natual Science and Mathematics (13)
- Laser (11)
-
- Liquid crystal (10)
- Photonics (9)
- College of Natural Science and Mathematics (8)
- Graphene (8)
- Physics (8)
- Semiconductors (8)
- Femtosecond (7)
- Infrared (7)
- Nanoparticles (7)
- Quantum dots (7)
- Semiconductor (7)
- Semiconductor lasers (7)
- Carbon nanotube (6)
- Diffraction (6)
- Lasers (6)
- Polarization (6)
- Scattering (6)
- Spectroscopy (6)
- Thin films (6)
- Ultrafast (6)
- Coherence (5)
- Diffusion (5)
- Photometry (5)
- Raman (5)
- Simulation (5)
- Publication Year
Articles 661 - 668 of 668
Full-Text Articles in Physics
Deformation Studies Of Tungsten-Gold Contacts At The Nanometer Scale., Steven A. Smallwood
Deformation Studies Of Tungsten-Gold Contacts At The Nanometer Scale., Steven A. Smallwood
Electronic Theses and Dissertations
The deformation behavior of atomically clean, nanometer sized tungsten / gold contacts was studied at room temperature in ultra-high vacuum. An instrument that combines atomic force microscopy (AFM), scanning tunneling microscopy (STM), and field ion microscopy (FIM) into a single experimental apparatus was designed, constructed, and calibrated. A cross-hair force sensor having a spring constant of - 442 N/m was developed and its motion was monitored during indentation experiments with a differential interferometer. Tungsten tips of controlled size (12.8 nm < tip radius < 2 1.6 nm) were first shaped and characterized using FIM and then indented into a Au (1 10) single crystal to depths ranging from 1.5 nrn to 18 nm using the force sensor. Continuum mechanics models were found to be valid in predicting elastic deformation during initial contact and plastic zone depths despite our small size regime. Multiple discrete yielding events lasting < 1.5 ms were observed during the plastic deformation regime; at the yield points a maximum value for the principal shear stress was measured to be 5 + 1 GPa. During tip withdrawal, "pop-out" events relating to material relaxation within the contact were observed. Adhesion between the tip and sample led to experimental signatures that suggest neck formation prior to the break of contact. STM images of indentation holes revealed various shapes that can be attributed to the (1 1 1 ) (1 10) crystallographic slip system in gold. FIM images of the tip after indentation showed no evidence of tip damage
Calibration Methodology And Multiple Tip Structure By Scanning Tunneling Microscopy., Michael Stephen Gossman
Calibration Methodology And Multiple Tip Structure By Scanning Tunneling Microscopy., Michael Stephen Gossman
Electronic Theses and Dissertations
The scanning tunneling microscope has been in commercial use just over a decade. Due to its Quantum Mechanical nature, experiments in this area have been widely publicized to the scientific community. The apparatus is steadily growing easier to use, though fundamental problems are still present. In the first chapter, an address is given on the modem theory of tunneling to rationalize the conclusions Physicists made long ago about this phenomenon. The expanded theory generalizes the mathematical motivation for attempting such unique experiments and serves as a lead-in for the major components of the apparatus. Many texts do not quantize what …
The Development Of A Solar Radiation Extinction Correction For Satellite Data, Widad I. Mohamed
The Development Of A Solar Radiation Extinction Correction For Satellite Data, Widad I. Mohamed
Electronic Theses and Dissertations
The main objectives of this thesis are the following: 1) Remove the haze using water surfaces in Landsat satellite imagery of the visible and near-infrared regions for their properties of high absorption of solar radiation and weak reflection of it. The scattered solar radiation is most obvious in dark weakly reflecting regions such as water. The haze removal technique depends on subtraction of scattered light from picture elements within the satellite imagery. 2) Derive a formula and techniques for a given image to correct for extinction by transforming the observed intensity of the signal transmitted to the Landsat detector to …
The Modification And Use Of An Electron Paramagnetic Resonance Spectrometer For Data Collection At Liquid Nitrogen Temperature, Vernon Lee Baumberger
The Modification And Use Of An Electron Paramagnetic Resonance Spectrometer For Data Collection At Liquid Nitrogen Temperature, Vernon Lee Baumberger
Electronic Theses and Dissertations
The scope of this study includes the modification of an EPR spectrometer for acquisition of low temperature data. The modification involved adaptation of the system for use with a cylindrical cavity specifically designed for low temperature operation. This modification increased the capability of the present system for data collection at liquid nitrogen temperature and gave such greater stability than the rectangular cavity previously used. A comparison was made of signal to noise for the two cavities. This study showed a somewhat greater signal to noise ratio for the low temperature cylindrical cavity. Operation at low temperature also allowed the observation …
Derivation Of The Diffusion Equation And A Revision Of Matsuda's Theory For Polarography, W. Patrick Rahilly
Derivation Of The Diffusion Equation And A Revision Of Matsuda's Theory For Polarography, W. Patrick Rahilly
Electronic Theses and Dissertations
Many theories have been proposed to yield a current-time relationship in Polarography. The most widely accepted is that of Matsuda. He assumes that the electrolyte can be separated into an inhomogeneous region about the mercury drop and a homogeneous region elsewhere. This assumption leads to a first order , nonlinear, ordinary differential equation directly solvable by substitution of a properly chosen series. But the series solution obtained is only a particular solution; for there exists, as one would expect, a family of solutions depending on a contrast of integration. In the literature, derivation of the diffusion equation has never been …
An Investigation Of The Effects Of Wave Propagations In An Infinite Membrane Upon The Motions Of Salt Particles On The Surface, Robert Talmadge Maupin
An Investigation Of The Effects Of Wave Propagations In An Infinite Membrane Upon The Motions Of Salt Particles On The Surface, Robert Talmadge Maupin
Electronic Theses and Dissertations
No abstract provided.
The Relative Influence Of Raw Material Components Upon The Thermal Expansion Of Vitreous Enamel., Robert C. Boyd
The Relative Influence Of Raw Material Components Upon The Thermal Expansion Of Vitreous Enamel., Robert C. Boyd
Electronic Theses and Dissertations
No abstract provided.
Color., Bruce B. Vance
Color., Bruce B. Vance
Electronic Theses and Dissertations
Color, any attempt to apply the scientific principles of color vision in the making of a picture must surely fail if it be not granted at the out set that it is only to a limited degree that those principles can apply. Color appreciation is as much a psychical as a physiological, and indeed, it is psychical not only with regard to the objective impression itself, but also with regard to the subjective, the associational mental process. Previous knowledge and training, experience traditions, the association of color impressions with impressions previously received through other senses and stored away as memories, …