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 782 for “"axes"”.
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Rotary-linear axes for high speed machining
This thesis presents the design, analysis, fabrication, and control of a rotary-linear axis; this axis is a key subsystem for high speed, 5-axis machine tools intended for fabricating centimeter-scale parts. The rotary-linear axis is a cylinder driven independently in rotation and translation. This …
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The Early Iron Age socketed axes in Britain
… socketed axe. Out of 1412 known Early Iron Age axes, 954 specimens were analysed in detail for this thesis: 680 associated finds and 274 single finds. The methodology was governed by two main objectives: firstly, to propose a reworked and more comprehensive typology of Early Iron Age cast …
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Multiple axes of inter-organ signaling regulate organ scaling
The mechanisms governing static allometry of organ size has long been enigmatic. A central hypothesis predicts that during animal growth, body size is perceived by organs via inter-organ signals, which directs organ growth to match body size. Ligands of the Transforming Growth Factor β (TGFβ) …
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Numerical analysis of a tape spring hinge folded about two axes
The ability to fold and unfold large sensor structures in space using hinges is important for space-based sensor technology. Tape spring hinges have become common in deployable space structures due to simplicity, repeatability and unique folding properties. The mechanical response of these hinges …
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The use of conditional and potential instability axes for severe weather forceasting
… In addition, the sharpness of these ridge axes may correlate to an increase in severe potential. To test this theory, a mathematical formula was devised to quantitatively assess ridge strength. Then, using theta-e, lapse rate and their respective ridge strengths as predictors, a linear …
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Multiple Axes of Social Location and Transpeople: Interrogating the Concept of "Intersectionality"
… experienced and expressed through multiple axes of social location. Transpeople change genders in relation to androcentric, middle-class, whitenormative, and heterocentric cultural narratives. My dissertation contributes to our understandings of the interconnections of the social structural …
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Knee Angles and Axes Crosstalk Correction in Gait, Cycling, and Elliptical Training Exercises
… than gait (G) nor estimated the corrected knee axes following PCA correction. The hypothesis of this study is that PCA can correct for crosstalk in G, C, and E exercises but that subject-specific PCA corrected axes differ for these exercises.</p> <p> Motion analysis of the selected exercises …
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Influence of motion profile on estimating anatomical elbow joint axes using inertial measurement units
… calibration of the human elbow anatomical joint axes via decomposition of angular velocity measurements. This thesis evaluated this calibration-free method in the context of two motion types. First, the method is evaluated with human-generated motions common to occupational rehabilitation, to …
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Tool design for the production of a collimator on a 3-axes vertical milling centre
… Zambia, successfully adapted a Supermax 65A, 3-axes CNC Vertical Milling Centre (VMC) to include turning operations'. Later, in 2002, Daka B., University of Zambia, looked at turning tools that could produce various profiles using the adaptations made on the same machine tool. After having done …
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Tool design for the production of a collimator on a 3-axes vertical milling centre
… Zambia, successfully adapted a Supermax 65A, 3-axes CNC Vertical Milling Centre (VMC) to include turning operations'. Later, in 2002, Daka B., University of Zambia, looked at turning tools that could produce various profiles using the adaptations made on the same machine tool. After having done …
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Intersecting Axes: Narrative and Culture in Versions of the Lizzie Borden Story (A Performative Approach)
… by narrative and feminist theories, INTERSECTING AXES draws upon interdisciplinary, contemporary re-workings of Judith Butler’s concept of “performativity” to explore the ways in which versions of the Lizzie Borden story negotiate such themes as repetition and difference, freedom and constraint, …
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Black Brazilian female dancer-choreographer-educators : creating alternative axes of action in the African diaspora
… By introducing the concept of alternative axes of action as spatial longitudinal oblique lines established slightly outside of a mainstream vertical axis where bodily balance and motion - and sociopolitical actions - are often assumed to be performed, I argue that black women in the African …
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A Seasonal Study of the Pituitary-Gonadal-Adrenal Axes in Peromyscus Leucopus from Natural Environments
Since Elton’s account and description of population cycles in 1924, a vast amount of research has been undertaken to ascertain what animals have three to four ye a r cyclic fluctuations and what mechanisms are responsible for these seemingly predictable changes. For many years the spectacular …
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Internal Structure of an Electronics Achievement Test Examined by a Principal Axes Analysis and a Homogeneous Clustering Technique
Made available in DSpace on 2014-12-04T17:32:54Z (GMT). No. of bitstreams: 1 0009144.pdf: 6322207 bytes, checksum: f1d5bc91a75eac8f323c5d2912bda0b5 (MD5) Previous issue date: 1954
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Glycoprotein hormone receptors in sea lamprey (Petromyzon marinus): Identification, characterization and implications for the evolution of the vertebrate hypothalamic-pituitary-gonadal/thyroid axes
… hypothalamic-pituitary-thyroid (HPT) endocrine axes involve specific interaction between pituitary glycoprotein hormones GpH (lutropin LH, follitropin FSH, thyrotropin TSH) and glycoprotein hormone receptors GpH-R (LH-R, FSH-R and TSH-R respectively).</p><p>GpHs and GpH-Rs originate in a common …
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Hub and Axis
… is a space configured as a hub that uses axes to determine entering, exiting and vertical movement. The hub configuration of the building is in concentric rings around the atrium in both space and materials. As materials were brought into the building, they enhanced the strong axial …
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Optical and X-ray study of the low plagioclases
… (1) y*, (2) location of the crystallographic axes, (3) separation of the non-Bragg e-diffractions from precession photographs, (4) refractive indices α, β, and γ, (5) the location of the optic axes, (6) the location of the principal vibration directions X, Y, and Z, (7) and a value of 2V. …
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Machine tool accuracy characterization, error modeling and compensation using telescopic ballbar and laser interferometer
… of an old Bridgeport Series I CNC 2 1/2 axes vertical machining center are presented in the form of dynamic and static circularity and repeatability errors, reversal spike, backlash, cyclic and squareness errors. The effects of speeds and feeds are also investigated. Furthermore, accuracy …
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Constraint Analysis and Theoretical Development of Multi-Furcation and Reconfiguration in Mechanisms
… these factors, relative orientations of joint-axes and the corresponding multi-furcation and reconfiguration are further discussed. The Dissertation starts from multi-furcation in the derivative mechanism from the "queer square" origami fold by allowing a full rotation of joints and reveals …
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