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 26 for “"destructive methods"”.
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Patterns and potential environmental drivers of mesophotic communities of the warm temperate shelf of the Amathole Region, South Africa
… from the collection of epibenthic data using destructive methods to less destructive methods that include visual surveys- using underwater camera platforms to explore the seabed. South African mesophotic ecosystems are under-sampled compared to both their shallower and deeper counterparts. The …
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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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ΣΥΝΕΙΣΦΟΡΑ ΤΗΣ ΕΠΕΞΕΡΓΑΣΙΑΣ ΕΙΚΟΝΑΣ ΣΤΗ ΦΥΣΙΚΟΧΗΜΙΚΗ ΜΕΛΕΤΗ ΤΩΝ ΒΥΖΑΝΤΙΝΩΝ ΚΑΙ ΜΕΤΑΒΥΖΑΝΤΙΝΩΝ ΕΙΚΟΝΩΝ. ΜΕΤΡΗΣΗ ΤΟΥ ΣΥΝΤΕΛΕΣΤΗ ΑΝΑΚΛΑΣΤΙ...
… INITIALSKETCH, COMBINED WITH THE APPLICATION OF "DESTRUCTIVE" METHODS OF ANALYSIS TO 13 BYZANTINE AND POST BYZANTINE ICONS LED TO THE PROPOSITION OF A COMPLETE METHODOLOGY TO CONFRONT THE PROBLEM OF THE PHYSICOCHEMICAL BEHAVIOUR OF PAINT LAYERS AND THE CONSERVATION OF BYZANTINE AND POST BYZANTINE …
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The Effect of Clay Content and Iron Oxyhydroxide Coatings on the Dielectric Properties of Quartz Sand
… might otherwise require more invasive and/or destructive methods. Previous studies have suggested that dielectric models could be refined by accounting for the contributions of different types of mineral constituents that affect the ratio and properties of bound and bulk water. This study …
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Mechanistic insights on the merits and limitations of advanced treatment processes for removal of contaminants of emerging concern
… 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 in …
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An expert system for the validation and interpretation of x-ray residual stress data
… 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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Development of a portable scratch test device for probing strength, ductility and structural distress in metal materials
… and ductility of metals without the use of destructive methods involving the extraction of tensile testing specimens. Although the scientific basis for scratch testing is well established, there is a necessity for a simple and robust implementation that avoids the complexities of current …
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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
… 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 and …
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Long-Term Performance of Seismically Rehabilitated Corrosion -Damaged Columns
… 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
… 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 flower-visiting insects. We analyzed preference between native and non-native plants, perennials and annuals, and among …
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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 obtained. …
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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
… 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 material …
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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
… mechanisms and systematic assessments using non-destructive methods. These results demonstrated how hunter-gatherer groups thrived over millennia, and that sAHGH are a good adaptive representation of dental analyses for precontact populations
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