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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 57 for “"Optical Method"”.
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Electro-optical method of distinguishing recyclable plastics
The UK produces 3 million tonnes of plastic waste each year, of which 85% is landfilled, 8% is incinerated and only 7% recycled. Recycling just one plastic bottle saves enough energy to power a 60W light bulb for six hours. Our local East Riding of Yorkshire Council is trying to reduce the amount …
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Optical method of recording electrical activity in isolated rabbit hearts
A recently developed optical method utilizes a single, implantable, optical fiber to record electrical activity from isolated hearts stained with voltage-sensitive dyes. This optical technique generates recordings of transmembrane potential from excitable myocardial tissue, and remain free from …
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Paper and printed paper surface characteristics studied using an optical method
A non-contact optical method for evaluating surface characteristics is reviewed. The optical reflectance instrument has been improved to be able to evaluate printed surfaces. Experiments were conducted with solid prints prepared on two types of papers printed with a heatset yellow ink. Both paper …
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An Optical Method for Thermal Boundary Layer Measurements in a Moderatelyrarefied Gas
Made available in DSpace on 2014-12-05T19:15:59Z (GMT). No. of bitstreams: 1 6104344.pdf: 2703718 bytes, checksum: dd26657ce9e50ac99d7cf7ed0eb13df1 (MD5) Previous issue date: 1961
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An Optical Method of Strain Measurement in the Split Hopkinson Pressure Bar
… (SHPB) continues to be one of the most common methods of testing materials at medium rates of strain. Elevated rates of strain, such as those found in impact and explosive applications, have been shown to induce phenomena such as strain hardening and phase transitions that can significantly …
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A new optical method for the measurement of residual stress in tempered glass
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1953.
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All-optical method of nanoscale magnetometry for ensembles of nitrogen-vacancy defects in diamond
… its high localization and retention of favorable optical properties at ambient conditions. Current methods of magnetometry with the NV center achieve high sensitivity to fields aligned with the defect axis; however, with most present methods transverse fields are not directly measurable. The …
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A novel non-invasive optical method for quantitative visualization of pH and oxygen dynamics in soils
… developed an efficient non-destructive in-situ method to determine biogeochemical parameters relevant to plant roots growing in soil. This is a quantitative fluorescence imaging method suitable for visualizing the spatial and temporal pH changes around roots. We adapted the fluorescence imaging …
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Laser surface thermal lensing (STL): An optical method for surface analysis of glass transition effects in transparent polymers
… distortion of the surface forms a transient optical lens structure, which can be monitored by the changes it induces in a second laser beam reflected at an angle off the same focal point. The Surface Thermal Lensing (STL) technique is based on detecting the modulated interference pattern that …
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Applications of the Optical Method of Caustics to the Study of Viscoelastic Dynamic Fracture and Static Blunt Crack Fronts
The opto-mechanical relation, as used in the optical methods of photoelasticity and caustics, are extended to linearly viscoelastic materials. The Maxwell-Neumann relation for the stress-optic constants, which is good for linearly elastic behavior, is replaced by an expression derived from the …
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Optical property studies and metalorganic chemical vapor deposition of ferroelectric thin films
… scientific aspect and the technical aspect. The optical properties of PZT solid solutions and the structure development in PZT films were extensively investigated in the scientific aspect. The PZT films used in this part of study were prepared by metalorganic decomposition (MOD) process. The …
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Optical Detection of Ultracold Neutral Calcium Plasmas
<p>We demonstrate an optical method to detect calcium ions in an ultracold plasma. We probe the plasma with a 397 nm laser beam tuned to a calcium ion transition. The probe laser beam is focused to a 160 µm waist allowing fine spatial resolution. Ions are detected by measuring fluorescence using a …
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Optical pattern comparison by interferometry
… for regularity of the fringe pattern. The method of interference used on input with small rotational errors and on relatively large displacements of the input does not affect the recognition capabilities of the system. This optical method is useful for making rapid pattern comparisons, …
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Investigation into the feasibility of detecting salt fingers optically
… was to determine the feasibility of optically detecting salt fingers. Theoretical calculations were conducted on the angular deviation and displacement of parallel light rays propagating through an ordered salt finger model. It is assumed that salt fingers are square cells (one …
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Remediation of chromium contaminated soils with colloidal silica
… the effectiveness of the technology. A new optical method to estimate the diffusion coefficient of chromium in gel was purposed. The diffusion coefficient obtained using the above optical method was used to evaluate the long term effectiveness of colloidal silica grouting technology. The …
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Crack growth resistance in nuclear graphite
… structure and properties, is compared using an optical method, a theoretical compliance method, and, a potential drop (PD) technique to measure crack length. Two graphites are coarse-grained and the third a fine grained graphite. Both 3-point bend and compact tension specimens are used. The …
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Experimental method of analyzing stress intensity factors and singularity order in rocket motor geometry
… surface at right angles. By applying a refined optical method, the photoelastic data are converted into classical stress intensity factors resulting from the three dimensional stress state existing at the inner surface and compared with a numerical analysis to indicate the nearly uniform …
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Compressive strength prediction for composite unmanned aerial vehicles
A rational methodology is presented to predict the compressive strength of carbon/epoxy compression specimens and prototype production parts using the model presented by Barbero in the Journal of Composite Materials, Vol. 32, No.5/1998. The experimental technique is an adaptation of the optical …
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Design and calibration of an infrared position sensor
An optical method for sensing lateral motion in silicon-based devices was developed and implemented. Using an infrared laser to illuminate the device and an InGaAs photodiode to detect the transmitted radiation, acquisition of the frequency component of motion has been demonstrated. A simple …
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