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 4946 for “"Scanning"”.
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Multiple reflector scanning antennas
… must be scannable over a region of space. Scanning by mechanically skewing the entire antenna assembly is difficult and in many situations is unacceptable. Performance during scan is, of course, also very important. Traditional reflector systems employing the well-focused …
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A Scanning Bi-static SODAR
… which are individually sampled. This allows scanning a column above a vertically transmitting antenna using frequency domain beamforming. The scanning capability of the receivers is demonstrated in field experiments, whose results motivated the development of a new theory about the effect of …
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Optically-Assisted Scanning Tunneling Microscopy
Scanning tunneling microscopy (STM) consistently provides the highest spatial resolution among the scanning probe methods, allowing surfaces to be investigated on the atomic level. With the addition of optical excitation, STM promises to become a powerful technique for single molecule spectroscopy, …
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Fast scanning two-photon microscopy
Fast scanning two-photon microscopy coupled with the use light activated ion channels provides the basis for fast imaging and stimulation in the characterization of in vivo neural networks. A two-photon microscope capable of fast scanning using acousto-optic deflectors was designed and implemented. …
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Switchable stiffness scanning microscope probe
… investigates the new concept of a dual stiffness scanning probe with respect to biological applications and determines the resulting requirements for the scanning of soft bio samples, such as low-pressure contact. On this basis, an in-plane AFM probe that is specifically tailored to the needs of …
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Simulating scanning tunneling microscope measurements
One of the largest problems in scanning tunneling microscopy design is noise control. It is the burden of the designer to determine if money should be used to build a floating room for vibration isolation or for top-of-the-line preamplifiers that can be placed at low temperatures. This thesis …
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High-resolution Optical Scanning Holography
Optical scanning holography, which was proposed by Poon[1], is a fascinating technology to record holographic information. The technique is applied in the operation of scanning holographic microscopy to record the entire three-dimensional volume of a biological specimen in the form of a hologram. …
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Scanning Tunneling Microscopy with Electrochemical Capabilities
No abstract prepared.
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Scanning near-field photon emission microscopy
… circuit (IC). Near-field optical detection using scanning near-field photon emission microscopy (SNPEM) promises resolution capabilities below 100 nm. However, existing implementations of SNPEM have serious limitations in terms of photon emission detection efficiency, repeatability and …
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Drift correction for scanning-electron microscopy
Scanning electron micrographs at high magnification (100,000x and up) are distorted by motion of the sample during image acquisition, a phenomenon called drift. We propose a method for correcting drift distortion in images obtained on scanning electron and other scanned-beam microscopes by …
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Towards high-bandwidth scanning impedance imaging
Contact-less, three-dimensional scanning is a highly important field for the semiconductor industry. By using a system of high-bandwidth impedance sensors and drive electronics, the physical constituents of ICs such as buried/surface dielectrics, buried/surface conductors and PN junctions could be …
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Novel Applications of Scanning Electrochemical Microscopy
Scanning Electrochemical Microscopy (SECM) is most commonly used to spatially resolve reaction rates, image surface topography and surface reactivity. In this research, SECM is applied to various chemical systems in order to resolve local reaction chemistry and to produce patterns with dimensions …
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Reconstruction Enhancements with Optical Scanning Holography
Optical scanning holography (OSH) [1] has the benefit of recording the entire three-dimensional (3-D) volume of a specimen in the form of a two-dimensional (2-D) hologram. Reconstruction of the original volume can be accomplished by applying digital reconstruction or decoding techniques to the …
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How Does Vegetation Movement During Laser Scanning Affect Common Point Cloud-Derived Metrics? A Virtual Laser Scanning Study
Close-range, high-resolution laser scanning is used in ecology, forestry and precision agriculture to assess plant health, structure, and productivity, and to monitor growth or regular movement patterns. A common problem in these applications is the wind-induced movement of vegetation during the …
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A Vertical Coarse Approach Scanning Tunneling Microscope
A Pan-style scanning tunneling microscope (STM), with a vertical coarse approach mechanism, was designed, built and tested. The microscope will be operated in ultra-high vacuum and also at cryogenic temperatures (8 K) inside a continuous flow cryostat. Fundamental differences in operating principle …
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Building practical apertureless scanning near-field microscopy
… a functional, practical apertureless type scanning near-field optical microscope, and to figure out the working mechanism behind it. Whereas a far-field microscope can measure the propagating field’s components, this gives us little information about the features of the sample. The …
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Intelligent laser scanning for computer aided manufacture.
… They provide the means for high resolution scanning of complex objects. Multiple scans of the object are usually required to capture the full 3D profile of the object. A number of factors, including scan resolution, system optics and the precision of the mechanical parts comprising the …
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Manipulative Scanning Tunneling Microscopy and Molecular Spintronics
… and applications in recent scientific studies. Scanning probe microscopy has emerged as a versatile tool for studying nanoscale interactions due to its capabilities of local measurement of spectroscopic, magneto-electric, and topographic properties in real-space with sub-nanometer resolution. …
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