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 20 for “"non-destructive methods"”.
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Finite element modeling of crack detection in aircraft structures using electrical current
Various non-destructive test methods have been developed for the detection of cracks in metallic structures. Electromagnetic non-destructive testing (NDT) is one of the widely used non-destructive methods used for the detection and characterization of cracks. Utilizing the principle of …
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Doppler-Broadening of Light Nuclei Gamma-Ray Spectra
<p>Non-destructive methods of material interrogation are used to locate hidden explosives and thwart terrorism attempts. In one such method materials are bombarded with neutrons which react with the nuclei of the atoms within causing a de-excitation process emitting a gamma-ray. The spectrum …
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Mechanistic insights on the merits and limitations of advanced treatment processes for removal of contaminants of emerging concern
… exhibit potential to persist and bioaccumulate. Non-destructive and destructive remediation strategies have been actively investigated to remove PFAS. Adsorption on activated carbon is the most widely used non-destructive treatment method to remove PFAS. However, limited innovation has occurred …
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An expert system for the validation and interpretation of x-ray residual stress data
… research community as one of the most accurate non-destructive methods for the determination of residual stress in polycrystalline structural materials, X-ray diffraction has not been widely adopted in the field. This is partly due to the fact that such measurements require, most often, a …
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Flexural Behaviour of Steel Fibre Reinforced Concrete Tunnel Linings
… has prompted a number of researchers to focus on methods of evaluating their flexural strength and stiffness. This thesis presents the results of an experimental and numerical investigation of the flexural behaviour of full-scale steel fibre reinforced concrete tunnel lining segments. A series of …
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Effects of Elevated Atmospheric CO2 on Root Dynamics, Biomass and Architecture in a Scrub-Oak Ecosystem at Kennedy Space Center, Florida
… because of their role in carbon sequestration. Non-destructive methods, including ground-penetrating radar (GPR) and minirhizotron observation tubes, were used to investigate effects of elevated CO<sub>2</sub> on root biomass, dynamics (productivity, mortality, and turnover), root persistence …
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Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns
… interface due to freeze-thaw was assessed using non-destructive methods and structural testing. The efficiency of using ACM to upgrade corrosion-damaged columns was investigated through lateral cyclic loading tests. It was found that freeze-thaw cycles did not have any effect on the mechanical …
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Late Holocene Paleoenvironmental Reconstruction in Barbados
… in cyclic precipitation patterns, as well as non-destructive methods for speleothem analysis that complement the isotopic study, while allowing sample preservation.</p>
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Ornamental Plants Impact Insect Pollinator Abundance and Diversity in Gardens
… lists, some not, and that were either native or non-native and perennial or annual. We surveyed the number and taxonomy of pollinator visitors to these plants through non-destructive methods. These data were analyzed to determine which plants are most effective at attracting abundant and diverse …
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Application of advanced non-destructive testing methods on bridge health assessment and analysis
… assessments take the form of individual NDT (non-destructive techniques) detecting individual defects. However value can be added to these results by combining and comparing the findings of several different NDT surveys. By completing this, a more accurate assessment of bridge health is …
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Failure mechanisms of thermal barrier coatings for high temperature gas turbine components under cyclic thermal loading
… microscopic damage analysis of APS TBCs, two non-destructive methods were applied for investigation of EB-PVD TBCs: - Grey scale analysis for the evaluation of thermal strains at the surface of EB-PVD TBC during cooling phase of the cyclic oxidation. - Infrared thermography for quantitative …
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Prediction of Water Activity in Cured Meat using Microwave Spectroscopy
… which have limitations, namely being destructive, expensive and time-consuming. Few attempts to develop non-destructive methods to predict aw have used X-ray systems (namely Computed Tomography), Near Infrared (NIR) and Hyperspectral Imaging (HSI). Although the techniques provided …
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Inferring Microstructural Change via Non-Contact Ultrasonic Property Measurements
… demands, these RPVs need to be evaluated with non-destructive methods due to the limited number of representative RPV coupons that exist for material evaluation via destructive tests. Transient Grating Spectroscopy (TGS) has been proposed as a non-destructive technique that can evaluate …
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Adaptive, High-Resolution Ultrasound Phased Array Imaging for use in the Inspection of Laser Brazed Joints in the Automotive Sector
… quality and reduce costs. Currently, the use of destructive techniques, such as cross-sectioning, is employed in the inspection process, with the ultimate desire being the shift to non-destructive methods. With this in mind, ultrasonic techniques have been investigated as a possible testing …
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Dental pathology and macrowear: a biocultural analysis of southern African holocene hunter-gatherers and hunter-herders
… as tools. Tool use was further demonstrated by non-masticatory wear (n = 22) and microchipping (n = 55), elucidating behaviours such as occupational tasks and dental hygiene. Generally, the teeth demonstrated good health; however, the first molar was affected most frequently with antemortem …
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Intelligent video surveillance
… now impossible without applying machine vision methods. The industrial applications require automatic quality control, including non-destructive methods and particularly methods based on the video analysis. All these applications give a strong evidence in a practical need in machine vision …
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Investigating peduncle colour evolution and chemistry during ripening in Vitis vinifera L. cv Shiraz
… date, and pave the way for the development of non-destructive methods of measuring peduncle colour in the field. This work has been prepared in publication style for the Australian Journal of Grape and Wine Research in 2014. Chapter 5 completes these exhilarating research works by summarising …
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3D SENSING APPROACHES FOR PRECISION AGRICULTURE: APPLICATIONS TO PLANT FEATURES CHARACTERIZATION AND TO WEED CONTROL IN MAIZE
… geometric properties, biomass estimation with non-destructive methods and discrimination between crops and weeds for use in precision agriculture applications. Following an introductory section, the first part of the work, which corresponds to Chapters 3 and 4, involves the volumetric …
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Diagnostika historického zděného objektu
Bakalářská práce pojednává o historii cihel, včetně vysvětlení technologie výroby. Dále se zabývá zkušebními metodami při diagnostice zděných konstrukcí a popisuje jejich provádění a vyhodnocení. V závěru práce je vysvětlena podstata návrhu charakteristické a návrhové pevnosti zdiva v tlaku. …