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.
Results
Showing 1 to 20 of 26 for “"structural instability"”.
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A scanning electron microscopy study of natural engineering soil
… properties of the soils, the mechanisms of structural instability in sensitive, collapsing and expansive soils are considered. The investigations, (1) show that many of the previous concepts of the nature of soil microfabric are unrealistic, (2) identify certain factors which play a …
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Excitons in Self-Assembled Hybrid Systems of Molecular Aggregate Light-Harvesting Nanotubes: Charge-Transfer Substrates and Solution-Stabilized Nanocomposites
… and the Frenkel excitons delicate nature. The structural instability, both dis-assembly and spontaneous re-assembly of aggregates. Analysis of the absorption spectrum of a model molecular aggregate system-light-harvesting nanotubes (LHNTs) of cyanine dye derivative C8S3-revealed the …
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Social disorganisation theory and violent crime: A spatial-econometric analysis of Chicago and Sydney
… The first is that the resulting focus on macro-structural variables permits large-scale urban studies to be conducted with existing datasets. The second is that this effectively isolates the spatial analysis from specific theoretical developments and generalises the results. The difference from …
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Alveolar Erosion and its Conservation Recommendations for the Sandstone Masonry at Durham Castle
… unit volume, leading to visual disfigurement and structural instability. Because of this long-lived problem, composite mortar repairs and stone replacement have frequently been performed on the castle. This study researches this current deterioration mechanism through literature reviews, archival …
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Helitrons are enriched in lichenized fungi with long generation length and small distribution sizes
… evolution by introducing mutations and causing structural instability and chromosomal rearrangements, particularly under conditions like environmental or genetic stress. In this study, we generated 18 new long-read reference genomes for lichenized fungi, which form obligate mutualistic symbioses …
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Finite Element Analysis of Thermal Buckling in Automotive Clutch and Brake Discs
… automotive clutch and brake discs design against structural instability induced by thermal buckling.</p>
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Interpreting site formation processes affecting re-emergent cultural sites within reservoirs: A case study of St. Thomas, Nevada
… site formation and the stability of remaining structural features. Field investigation, soil analysis, X-ray diffraction, examination of historic gauge records and aerial imagery indicates that St. Thomas, and perhaps other cultural sites located within the down-draw boundary of reservoirs, are …
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Atomistic simulation of strength and deformation of ceramic materials
… and computational algorithms to probe the microstructural effects in crystalline, amorphous, and nanocrystalline media. Specific issues of a materials property or mechanics of materials nature are addressed in the context of characterizing the limits to strength and mechanisms of structural …
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A Study of Ground Penetrating Radar Methods in an Underground Stone Mine to Improve Ground Control
… underground mines. Issues include water inrush, structural instability, and engineering uncertainty in these environments. Coupled with the fracturing prevalent in folded sedimentary rocks, karsts are complex and challenging ground control risks. Traditional methods of predicting karst void …
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Essays on technical analysis in financial markets
… as conditional windows based on the presence of structural breaks, identified using the conditional reverse ordered cusum method (ROC), of Pesaran and Timmermann (2002). Models that include both fundamental and technical indicators perform well, even allowing for realistic levels of transactions …
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Enhancing stability of powder-route nanocrystalline tungsten-titanium via alloy thermodynamics
… high temperatures required for processing. The structural instability stems from a large volume fraction of grain boundaries that carry an intrinsic energy penalty, but can be overcome by a consideration of the thermodynamics-based mechanism of interface energy relief via alloying. Suitable …
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Preparation, Characterization, and In Vitro Evaluation of Multiple Emulsion for Topical Application of Lawsone and Dihydroxyacetone
… after 28 at 40˚C, showing physical/ chemical instability of emulsions at increased temperature. Chemical instability of the emulsions was confirmed by varying decrease in pH at 32˚C and 40˚C of DHA emulsion and combination emulsion. Structural instability of emulsions at 40˚C was confirmed by …
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A Framework for Evaluating Thaw Settlement in Permafrost Regions
… in cold regions, leading to ground subsidence, structural instability, and increased maintenance costs. Accurate thaw settlement prediction is essential for mitigating these effects and ensuring infrastructure resilience. This thesis presents a Thaw Settlement Evaluation Framework designed to …
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Factors Influencing Adoption of Conservation Agriculture in the Democratic Republic of the Congo
… to cope with its post-independence political and structural instability. From 1961 to 2000, the DRC experienced a decrease of 34% and 37% in daily caloric intake and protein intake, respectively. The DRC’s agriculture sector, led by women (who are the core of subsistence farming), is now being …
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Self-folding bilayers: Mechanistic design principles for programmable and on-demand shape reconfiguration
… polygons demonstrated a bifurcation type of structural instability where they transitioned from doubly curved axisymmetric shapes to singly curved asymmetric ones at critical strains. Bifurcation occurs solely due to nonlinear geometric effects and hence the results of this research …
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Evolution of large palindromes on the primate X chromosome
… of these genes in humans. Unexpectedly, structural comparisons of conserved palindromes between species revealed frequent rearrangements around the center of palindrome symmetry; this instability persists among human X chromosomes, which are enriched for deletions within the spacer that …
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Printing a glass ecology
… control of a digital machine and harnessing structural instability. Close study not only of the objects generated but also their behavior during fabrication is key to understanding how the glass responds to the motion of the machine. Analysis of the project workflow itself provides the …
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New modalities for strain engineering of lead-free perovskite ferroelectric thin films
… ̶ a temperature-independent composition-driven structural instability that results in superior dielectric and piezoelectric properties. However, increasing environmental concerns are driving efforts towards the development of lead-free ferroelectrics such as BiFeO3, BaTiO3, and others. Previous …
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Development and testing of climate-sensitive site index models for long rotation Eucalyptus grandis in Limpopo province of South Africa
… and Schumacher-type models showed weaker fit and structural instability at older ages. Climate–parameter linkage analyses revealed strong associations between precipitation seasonality, dry- and wet-season rainfall (e.g., BIO16, BIO17), drought indices (SPEI), and key model parameters, indicating …
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Self-reporting of Mn ion dissolution and self-stabilization of cathode-electrolyte interface in lithium ion batteries
… to the phase transition potentials of LMO. Structural instability and change in surface chemistry during the LMO phase transition are regarded to be the cause of Mn dissolution. Furthermore, Mn dissolution intensifies after LMO is overdischarged to 2.5 V. Jahn-Teller distortion on Mn(III) at …
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