Thesis (Ph. D.)--University of Wisconsin--Madison, 1958. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Honors Project--Smith College, Northampton, Mass., 2010. / Includes bibliographical references (p. 46).

No description available.

Digitized by Kansas State University Libraries

Call number: LD2668 .T4 1963 C54 / Master of Science

MSc., Faculty of Science, University of the Witwatersrand, 2011 / This dissertation presents the results of a crystallographic investigation into nineteen novel n-aminopyridinium perhalometallates of the general formula (C5H7N2 +)2MX4 2- where n = 2, 3 or 4, M = Zn, Cd or Hg and X = Cl, Br or I. The aim was to identify positional effects of the cation hydrogen bonding donor groups on the structures and to possibly identify robust synthons. Overall structural trends were also studied. The hybrid crystals were synthesized using temperature controlled crystallization methods and were characterized using X- ray diffraction techniques. Eighteen of the nineteen hybrid crystals displayed isolated tetrahedral perhalometallate anions. The results were classified into six different classes of isostructural compounds. Eight of the nineteen hybrid structures (42%) contained water. The 42% include two 3-ammoniopyridinium structures and all cadmium and mercury containing 4-aminopyridinium structures. The effect of a change in metal and/ or halide on the structure was investigated, and the overall structural trends in each n-aminopyridinium family were identified. Four different synthons were observed in the 2-aminopyridinium series while one synthon was observed throughout the 4-aminopyridinium series. A common synthon was observed in both the 3-aminopyridinium and 3-ammoniopyridinium series.

Thesis (Ph.D)--Aerospace Engineering, Georgia Institute of Technology, 2009. / Committee Chair: Ruzzene, Massimo; Committee Member: Hanagud, Sathya; Committee Member: Hofges, Dewey; Committee Member: Leamy, Michael; Committee Member: McDowell, David. Part of the SMARTech Electronic Thesis and Dissertation Collection.

Thesis--Ohio State University. / Includes bibliographical references.

Crystallographic complex reflection groups are generated by reflections about affine hyperplanes in complex space and stabilize a full rank lattice. These analogs of affine Weyl groups have infinite order and were classified by V.L. Popov in 1982. The classical Braid theorem (first established by E. Artin and E. Brieskorn) asserts that the Artin group of a reflection group (finite or affine Weyl) gives the fundamental group of regular orbits. In other words, the fundamental group of the space with reflecting hyperplanes removed has a presentation mimicking that of the Coxeter presentation; one need only remove relations giving generators finite order. N.V Dung used a semi-cell construction to prove the Braid theorem for affine Weyl groups. Malle conjectured that the Braid theorem holds for all crystallographic complex reflection groups after constructing Coxeter-like reflection presentations. We show how to extend Dung's ideas to crystallographic complex reflection groups and then extend the Braid theorem to some groups in the infinite family [G(r,p,n)]. The proof requires a new classification of crystallographic groups in the infinite family that fail the Steinberg theorem.

Low-density cellular solids have demonstrated superior mechanical properties as well as multifunctional characteristics, which may provide a basis for the development of novel structured materials. In particular, cellular solids offer great design flexibility, owing to their topology, which can provide desired functionalities via targeted geometric design and proper selection of the constituent material. While stochastic configurations such as metallic foams have proven to be effective for both thermal insulation and mechanical-energy absorption, the topology of deterministic architectures is not constrained by physical processes. This allows for a variety of configurations to be tailored to simultaneously fulfill disparate tasks. An additional aspect of deterministic cellular structures is the possibility of assembling materials or structures by the spatial repetition of a unit cell. The resulting periodicity of such systems simplifies the characterization of physical properties, which can be established by analyzing the unit cell only, and will provide new opportunities in the fields of structural dynamics, where periodicity-induced impedance leads to the control of both constructive and destructive interference on propagating waves. The objective of this work is to investigate the application of the chiral cellular topology for the design of novel macrostructural, mesostructural and microstructural configurations. A truss-core airfoil, and a truss-core beam are employed as a basis to demonstrate both large-displacement capabilities within the elastic regime of the constituent material, as well as operational deflection shapes with localized dynamic deformations. Large deformation capabilities and unique operational deflection shapes are to be attributed to the unusual deformation mechanism of the chiral lattice. Mesostructural and microstructural configurations, on the other hand, are characterized by an unique mechanical behavior, complex geometry, as well as geometric design flexibility to control both static and dynamic phenomena. The propagation of elastic waves, moreover, is characterized by significant band-gap density as well as strong energy focusing dependent on frequency and wavenumber. These features suggest the chiral topology as a basis for the development of acoustic meta-materials.