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 5197 for “"crystal"”.
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Single Crystal Sapphire Photonic Crystal Fibers
A single crystal sapphire optical fiber has been developed with an optical cladding that is used to reduce the number of modes that propagate in the fiber. This fiber is the first single crystal sapphire photonic crystal fiber ever produced. Fabrication of the optical cladding reduces the number of …
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Incommensurate crystal optics
Contains fulltext : mmubn000001_121504395.pdf (Publisher’s version ) (Open Access)
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Magnetic quartz crystal microbalance
In this thesis, a new technique for using quartz crystal microbalance (QCM) in magnetic field was explored. This technique would take advantage of the sensitive nature of QCM to vibration changes. The idea is to perturb the QCM vibrations with magnetic materials on it by applying magnetic field. A …
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Crystal Engineering molekularer Festkörper
Die vorliegende Arbeit befasst sich mit der Kristallisation und der Co-Kristallisation kleiner und starrer organischer Moleküle. Im Mittelpunkt standen dabei die beiden Moleküle Benzoesäure (HBz) und Benzamid. HBz und seine Alkalimetallsalze (Natriumbenzoat (NaBz) und Kaliumbenzoat (KBz)) werden in …
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Crystal Engineering of Flavonoids
Crystal engineering is attracting attention in the pharmaceutical industry because the design of new crystal form of drugs can improve their stability, bioavailability and other relevant physical characteristic properties. Therefore, crystal engineering of nutraceuticals such as flavonoids by …
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Sonic Crystal Noise Barriers
… arranged vertical cylinders known as a Sonic Crystal (SC) is investigated. As a result of multiple (Bragg) scattering, SCs exhibit a selective sound attenuation in frequency bands called band gaps or stop bands related to the spacing and size of the cylinders. Theoretical studies using Plane …
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Rate independent crystal plasticity
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1995.
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Morphology, Crystal Structure, Phase Transitions and Blend Compatibility of Thermotropic Liquid Crystal Terpolyesters
Compatibility of P7 and P7-X in binary blends with polyethylene (PE), polyethylene terephthalate (PET), and nylon 6 (Ny6), was examined to evaluate the effect of the aliphatic segment in promoting good adhesion at the interphase. Partial compatibility was observed for PE blends, while miscibility …
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Morphology and crystal structure of random, main chain, semi-flexible, thermotropic liquid crystal polymers
"The crystal structure and morphology of random, main chain, thermotropic liquid crystal polymers (LCP's) of equimolar amounts of the following structural units (with n equal to 4, 5, 6 and 7 in ""A"") have been examined by electron microscopy and diffraction:(DIAGRAM, TABLE OR GRAPHIC …
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Cyclic polymer liquid crystal structures.
Recent advances in liquid crystal research have included the synthesis of polymeric materials which contain liquid crystalline moieties. The work presented here concerns the study of the structure-property relationships of a particular group of liquid crystalline polymers in which the polymer …
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The crystal chemistry of titanite
The chemical substitutions of primary importance in natural titanites are (Al,Fe)<sup>3+</sup> + (F,OH)<sup>-</sup> ⇆ T<sub>1</sub><sup>4+</sup> + O<sup>2-</sup> , where total Al + Fe is not greater than 30 mol % and Al is usually predominant. Electron microprobe analyses and bond strength …
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Polarization-independent Liquid Crystal Devices
Liquid crystal (LC) devices can be operated as amplitude modulators and phase modulators. LC amplitude modulation is commonly used in liquid crystal display (LCD) while phase-only modulation is useful for laser beam steering, tunable grating, prism, lens, and other photonic devices. Most LC devices …
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Fast Response Liquid Crystal Devices
Liquid crystal (LC) has been widely used for displays, spatial light modulators, variable optical attenuators (VOAs) and other tunable photonic devices. The response time of these devices is mainly determined by the employed liquid crystal material. How to obtain fast response for the LC devices is …
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Tunable Liquid Crystal Photonic Devices
Liquid crystal (LC)-based adaptive optics are important for information processing, optical interconnections, photonics, integrated optics, and optical communications due to their tunable optical properties. In this dissertation, we describe novel liquid crystal photonic devices and their …
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Single chirality through crystal grinding
Contains fulltext : 74877.pdf (Publisher’s version ) (Open Access)
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On Protein Crystal Nucleation Precursors
Protein crystallization is central to our understanding of molecular structures in biology, vital to industrial processes in the pharmaceutical industry, and increasingly appreciated as a critical block in understanding numerous disease pathologies. Although the nucleation process is critical in …
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Optimization of Photonic Crystal Structures
… method for improving the performance of photonic crystal structures. Possible future research directions and applications are also briefly discussed.
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Advanced photonic crystal enhanced microscopy
This study seeks to expand the field of photonic crystal enhanced microscopy by extending simple proof-of-concept experiments to advanced biological applications. There are four distinct projects that are related to a central theme: sophisticated microscope instrumentation for photonic crystal …
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