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 514 for “"Couplings"”.
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Inertial Hysteresis Couplings
… (IHC), a new family of variable-slip mechanical couplings/clutches aimed at achieving order-of-magnitude (∼10x) improvements in torque density (torque capacity / coupling diameter) over existing magnetic and fluid options. IHCs leverage combined normal, frictional, and inertial forces acting on …
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Nickel-catalyzed asymmetric cross-couplings of secondary alkyl electrophiles and photoinduced, copper-catalyzed C-N couplings
… three nickel-catalyzed asymmetric Negishi cross-couplings of secondary alkyl electrophiles via a stereoconvergent process. In Section 1.1, asymmetric Negishi arylations and alkenylations of [alpha]-bromonitriles with arylzinc and alkenylzinc reagents are achieved using a nickel/bis(oxazoline) …
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Meson Photo-Couplings From Lattice Quantum Chromodynamics
<p>We explore the calculation of three-point functions featuring a vector current insertion in lattice Quantum Chromodynamics. These three-point functions, in general, contain information about many radiative transition matrix elements simultaneously. We develop and implement the technology …
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Fatigue Performance of Brass Light Pole Couplings
Bending tests were performed on behalf of the Illinois Department of Transportation on Copper Development Association 360 brass notched specimens of with internal threading and an external notch cut to a depth of 0.150 in the first design in square, diamond, and individual loading configurations. …
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Nickel-catalyzed cross-couplings of unactivated secondary and tertiary alkyl halides and photoinduced copper-mediated asymmetric C-N cross-couplings
Chapter 1 describes the development of two nickel-catalyzed Suzuki cross-coupling methodologies that employ alkyl halides as electrophiles. In Section 1.1, asymmetric [gamma]-alkylation relative to a carbonyl group is achieved via the stereoconvergent cross-coupling of racemic secondary …
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Design and application of compliant quasi-kinematic couplings
… performance limit (~ five microns) of low-cost couplings. The absence of a means to meet these requirement has motivated the development of the Quasi-Kinematic Coupling (QKC). This thesis covers the theoretical and practical considerations needed to model and design QKCs. In a QKC, one component …
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Elastically Housed Kinematic Couplings for InterchangeableElectric Vehicle Batteries
… due to immense charging downtime, but kinematic couplings have the potential to bridge this barrier by allowing for battery swaps and simultaneous operation and back-up battery charging. Designing parameters such as an elastic housing to damp the battery’s connection could overcome challenges …
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TRANSITION METAL CATALYZED CROSS-COUPLINGS OF ALKYL SULFONE ELECTROPHILES
Sulfones are an important class of organic molecules that can participate in a wide variety of synthetic transformations. For this reason, they have been described as chemical chameleons. While their use as Csp2 electrophiles in cross-coupling dates to the early 1970’s, their potential as competent …
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Euclidean Dynamical Triangulations: Running Couplings and Curvature Correlation Functions
… a lattice theory of gravity, we examine how the couplings of the theory run with scale. We find that the dimensionless couplings $\hat{G}$ and $\hat{\Lambda}$ are not separately relevant, but $G\Lambda$ is. We argue that the lattice regulator breaks general coordinate invariance, and so a …
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Tddft Derivative Couplings And Other Topics In Quantum Chemistry
… are developed calculating the derivative couplings between the excited states within the time-dependent density functional theory. The behavior of the derivative couplings around a conical intersection is analyzed for two real molecules: benzaldehyde and protonated formaldamine. The second …
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Magnetoelastic couplings in epitaxial Cu/Ni/Cu/Si(001)
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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The structural interaction of pipe couplings used for trenchless construction.
Trenchless construction of underground services by the pipe jacking method has radically increased over the past thirty years, particularly in sensitive urban areas. Spoil is removed at the cutting face and the entire pipeline is pushed through an oversized tunnel bore by large hydraulic jacks. The …
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New Aspects of Gauge-Boson Couplings and the Higgs Sector
… In a form-factor approach to three-gauge-boson couplings at linear colliders in the process e+ e- ---> WW ---> 4 fermions the strongest possible bounds on the 28 parameters are determined by means of optimal observables. The improvement in sensitivity by longitudinal or transverse beam …
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Inferring protein conformational ensemble using deep learning and evolutionary couplings
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Precision location of additively manufactured components using integral kinematic couplings
… assemblies. In this thesis, integral kinematic couplings (KCs) are shown to provide precision location of AM components. Maxwell KCs are fabricated using four common AM processes for characterization of their accuracy, repeatability, and stiffness. Modest plastic deformation at the locations of …
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Nonlinear analysis of eddy-current couplings in feedback control systems
… nonlinear analysis is developed for eddy-current couplings in feedback control systems. The analysis makes use of the describing function method to predict transient response. Effects of the nonlinearity are discussed and backed with an analog computer study. Conclusions arrived at show the …
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