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 25 for “"Cross-sectional geometry"”.
-
Exploring Microstructural Signatures of Physiological Stress through Cross-Sectional Geometry and Cortical Bone Histology
… octants were assessed, accounting for variation across periosteal, intracortical, and endosteal membranes. ArcGIS Pro was used to manually annotate remodeling events (including osteon morphotype) and ImageJ was used to automate osteocyte lacunae counts, allowing for histomorphometrics osteon …
-
The effects of selected corn-soybean tillage systems on rill cross-sectional geometry and soil erosion for two Illinois soils
… objectives of this study were to quantify rill cross sectional geometry under different tillage, crop and soil conditions and to relate variations in rill geometric properties to measured sediment discharge and to soil erosion and sediment transport predicted by various models. In the …
-
Torsion of Elliptical Composite Cylindrical Shells
… material failure is considered. Four elliptical cross sections, defined by their aspect ratio, the ratio of minor to major radii, are considered: 1.00 (circular), 0.85, 0.70, and 0.55. Two overall cylinder sizes are studied; a small size with a radius and length for the circular cylinder of 4.28 …
-
The palaeobiology of the non-mammalian cynodonts deduced from bone microstructure and stable isotopes
… to more derived forms was examined using bone cross-sectional geometry and histology, as well as isotope analyses. The bone histology of multiple postcrania revealed distinct variations in growth pattern between the genera studied. The bone histology of the basal Procynosuchus indicates that …
-
Dynamics and kinematics of an estuarine network
… each of which is characterized by a different cross-sectional geometry. This thesis focuses on the hydrographic variability and varying exchange flow within the Newark Bay estuarine network. Shipboard hydrographic measurements reveal the time-dependent formation of salinity fronts between …
-
Design of a hermetically sealing inlet for in-situ planetary exploration
… the sealing interfaces and an inverted dovetail cross sectional geometry for a linear carriage. The inlet emphasizes a design for manufacturability, weight savings, durability, and many cycles. Based on the established fundamental requirements, the design is evaluated on the thermal analysis at …
-
Combined structural and manufacturing optimization of stiffened composite panels
… structurally important design variables, such as cross-sectional geometry and material properties, on the manufacturing performance of the panel. In addition, the effects of manufacturing process variables, such as pressure and temperature, on the structural performance are studied. The structural …
-
Improving the Structural Dynamics of Slender Beam-like Structures
… beam-like structures with step changes in cross sectional geometry, such as flexible robotic arms or power transmission cables.
-
Design and development of a novel lightweight long-reach composite robotic arm
… on large objects with complex curvature. The cross-sectional geometry of the links of the arm were analyzed for optimal stiffness- and strength-to-weight ratios that are capable of preserving high precision and repeatability under time-dependent external excitations. The results lead to a …
-
Discovering the Complex Aerodynamics of Flapping Flight with Bio-kinematics Using Boltzmann and Eulerian Methods
The cross-sectional geometry of an insect wing has historically been simplified to a rectangular, elliptic, or having a streamlined airfoil shape. Up until this point, no analysis has utilized a morphologically accurate insect wing. As such, there remains significant questions as to whether or not …
-
Dynamics and kinematics of an estuarine network
… each of which is characterized by a different cross-sectional geometry. This thesis focuses on the hydrographic variability and varying exchange flow within the Newark Bay estuarine network. Shipboard hydrographic measurements reveal the time-dependent formation of salinity fronts between …
-
A finite element approach for the implementation of magnetostrictive material terfenol-D in automotive CNG fuel injection actuation
… properties as the plunger material. A 2D cross-sectional geometry including the injector housing, coil, Terfenol-D shaft, and plunger, was modeled in both Finite Element Method Magnetics (FEMM) and ANSYS for 2D axisymmetric magnetic simulation. The magnetic simulations were performed in …
-
Engineering Application-Specific Plasmonic Nanoparticles: Quantitative Measurements and Precise Characterization
… quantifying individual nanoparticle scattering cross-sections by comparing experiments with analytical theory for gold nanospheres is proposed and utilized. Results show that elongated particles scatter very brightly for their volumes. This brightness is due to a strong longitudinal plasmon …
-
Long Waves In Channels Of Non-Uniform Cross-Section
A cross-sectionally averaged one-dimensional long wave model is developed. Three dimensional equations of motions for inviscid and incompressible fluid are first integrated over a channel cross section. To express the resulting one-dimensional equations in terms of the longitudinal component of the …
-
Mathematical modelling of unsteady tube stretching with internal channel pressurisation for fabricating electrospray ionisation emitters
… the design of nESI emitters, as their shape and geometry are critical to the electrospray performance and subsequent MS detection. In the actual manufacturing of these emitters through the heat and draw process, the desired geometry cannot, at present, be achieved. In particular, the inner …
-
Effects of Experimental Conditions on Fracture Research Using 3D Printed Materials
… control method and rate, specimen size, specimen cross-sectional geometry, boundary constraints, and flaw parameters. The specimens were prepared using a 3D stereolithography printer utilizing clear resin material. Identical pre-existing quasi-elliptical (ovaloid-shaped) flaws were placed in the …
-
Modal and radiation characteristics of the crossed-septum dielectric loaded waveguide for wideband applications
… a 90 degree rotationally symmetric waveguide cross sectional geometry that can support single-mode propagation over the desired bandwidth. This dissertation presents a novel method of obtaining bandwidth enhancement of a square waveguide using both dielectric loading and mode filters that …
-
Integrating Smart Materials and Adhesion Mechanics for Soft Gripping Mechanisms
… and adhesion mechanics. First, the effect of the cross-sectional geometry on enhancing the dry adhesion strength of soft composite elastomeric structures is examined. Second, the effect of inserting a thin serpentine channel of a low melting point alloy (LMPA) close to the interface of an …
-
Stochastic modeling in computational electromagnetics
… a pair of interconnects with random cross sectional parameters, and a band pass microwave filter with randomly positioned loads. The thesis focuses on methodologies for the assessment of structures exhibiting localized uncertainty, namely random changes in the geometric and material …
Page 1 of 2