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 27 for “"Heterogeneous structure"”.
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Unreliable Drunkards or Honorable Citizens? Artisans in Search of Their Place in the Cusco Society (1825-1930)
… to the Great Depression. We stress the heterogeneous structure of provincial artisan sectors and reject the notion of an urban artisan class because a common social and political identity among craftsmen of different social strata did not exist.
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Task scheduling and placement for reconfigurable devices
… Speed and efficiency of the free-space data structure are important as well as its effect on scheduler performance. We introduce the use of maximal horizontal strips and maximal vertical strips to represent free space. This resulted in a faster free space manager compared to what has been …
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Quantifying The Properties Of Magmatic Intrusions In The Central Andes With Geodesy
… sill I demonstrate the role of layering and 3D heterogeneous structure based on newly-available seismic tomography. The proposed heterogeneous structure increases the surface displacements for homogeneous crust by less than 7% within a 10km radius of the center of uplift.
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Generating finite integral relation algebras
… operations, every such algebra provides an atom structure, i.e., a relational structure on its set of atoms. In the case of complete and atomic structure (e.g. finite algebras), the original algebra can be recovered from its atom structure by using the complex algebra construction. This gives a …
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Entwicklung mechanischer Modelle zur analytischen Beschreibung der Materialeigenschaften von textilbewehrtem Feinbeton
… concrete (TRC). For the modelling of the heterogeneous structure of TRC the concept of representative volume elements (RVE) is used. RVEs are representative for the mesoscopic structure. The overall material behaviour on the macroscopic level is obtained by means of homogenisation of the …
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Effects of solvents on thermotropic liquid crystalline copolyesters
… of PET rich regions, occurs. This indicates a heterogeneous structure. An oversimplified molecular model has been proposed based on these results where at low PHB levels a PET rich phase is the continuous phase and at higher PHB levels (≥60 mole%PHB) a PHB rich phase is the continuous phase. …
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Phase Behavior, Microstructure and Mechanics of Colloid -Polymer Mixtures
… driven changes to the suspension phase behavior, structure and flow properties as a function of the strength and range of interparticle interactions. In particular, we establish links between the suspension microstructure and the mechanical response of gels formed via short-range depletion …
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Diffusion-Weighted MRI of Fibrous Tissue: Contribution of Fat
… pulse sequence. The region of interest is a heterogeneous structure inside a 3mmx3mmx9mm voxel, consisting of loosely arranged micron-sized tubes filled with fat. By assuming that the tubes are parallel inside the domain, the region of interest was simplified into a 2D domain (3mmx3mm). The …
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Diversity patterns and conservation priorities in the "Mountains of Central Asia" biodiversity hotspot
… productivity in lowland croplands, while the heterogeneous structure of high-mountain croplands should be maintained to conserve their species-rich segetal flora. Integrating topographic heterogeneity into agricultural landscapes may provide similar biodiversity benefits in mountain regions …
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Isotopes of selenium as redox tracers of geochemical processes influencing the export and behavior of selenium contamination in coal mine watersheds
… portions of the fill, highlighting the heterogeneous structure and varying redox conditions within valley fills.
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Deformation Behaviour of NiCo Multilayers with Modulated Microstructures
… in a laminate configuration, represent an ideal structure to study the influence of abrupt heterogeneities on deformation behaviour. While the deformation mechanisms of homogeneous coarse-grained and nanocrystalline materials are well documented, it is not clear from the current literature how …
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Indentation analysis and mechanical modeling of multilayered composites
… behavior. This modeling study treats the heterogeneous structure of the material explicitly, and seeks to correlate the overall material response with the intrinsic deformation characteristics. We first report on the nanoindentation behavior of the Al/SiC composites. Two material systems …
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Experimental and finite element analysis of mechano-electrochemical effects in intervertebral disc biomechanics
… of the degenerate nucleus pulposus exhibiting a heterogeneous structure and a dual permeability phase. Multiphasic models were developed and compared to experimental data. Differences were found between biphasic and triphasic models which resulted in varying agreement with experimental data thus …
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Investigations of Structure–Property Relationships in Semicrystalline Thermoplastic Polymers: Blown Polyethylene Films and Polyacrylonitrile Copolymers
… achieved by down gauging. In a second project, structure-property-processing relationships were investigated in a series of high density polyethylene (HDPE) blown films. The use of metallocene and chromium oxide based resins allowed the effects of MW and MWD on orientation behavior to be …
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Studies of PF Resole / Isocyanate Hybrid Adhesives
… Solid-state relaxation parameters revealed a heterogeneous structure in the non-weathered blends. Water boil weathering caused a more uniform relaxation behavior in the blend bondline. By conducting this research, more fundamental information regarding the PF/PMDI hybrid adhesives will become …
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Evolutionary models in structured populations
… In this work, the influence of the population structure on the outcome of the evolutionary process is explored. Through an analytic approach, this study first examines the stochastic evolutionary game dynamics following the update rules of the invasion process, an adaptation of the Moran …
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Structural heterogeneity in silk fibers and its effects on failure mechanics and supercontraction
… toughest natural fibers known. Silk features a heterogeneous structure that comprises [beta]-sheet crystals embedded in an amorphous matrix. However, it is not fully understood how the heterogeneity of silk affects its mechanical properties. First, the origin of the nanoscale heterogeneity …
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Structural Study of Heterogeneous States in Lead-free NBT-based Single Crystals
… to be incorporated into NBT to modify its microstructure and properties to meet these specific requirements, which may further complicate its chemical structure-property relationships. This study, therefore, was designed to investigate the heterogeneous structure of NBT-based single crystals, …
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Investigation into the impedance and communication requirements for the low voltage distribution line in the high frequency spectrum
… when used as a signal communication channel. The heterogeneous structure of the power line network with numerous branches and impedance mismatcheS causing reflections and attenuations during signal transmission, and thus communication signal cannot be sent out or received completely. From this …
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Surface structure and composition determination by low-energy electron scattering and Monte Carlo simulations
… systems.</p><p>(111), (110) and (001) surface structures of the semimetal bismuth are determined with LEED. The unreconstructed (1x1) structure is revealed for all three surfaces. The interlayer spacings for several outermost layers are resolved. All results agree with those obtained by …
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