UNT Libraries - 6 Matching Results

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Computer Simulations of Mechanical Behavior of Polymer Liquid Crystals

Description: In this dissertation molecular dynamics simulations of behavior of polymer liquid crystals (PLC's) under tensile deformation have been performed. PLC's composed of random or block copolymers of rigid and flexible segments have been studies. Systems of fully flexible chains have been simulated for comparison. Stress-strain relations and fracture mechanics have been investigated.
Date: December 1991
Creator: Blonski, Slawomir
Item Type: Refine your search to only Thesis or Dissertation
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Development and Application of a Nonlinear Optical Characterization Technique

Description: This dissertation reports a sensitive single beam experimental technique for measuring nonlinear refraction and nonlinear absorption in a wide variety of materials. The experimental setup is described and a comprehensive theoretical analysis including cases where nonlinear refraction and nonlinear absorption are also presented.
Date: August 1991
Creator: Said, Ali A. (Ali Ahmad)
Item Type: Refine your search to only Thesis or Dissertation
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Magneto-Optical and Chaotic Electrical Properties of n-InSb

Description: This thesis investigation concerns the optical and nonlinear electrical properties of n-InSb. Two specific areas have been studied. First is the magneto-optical study of magneto-donors, and second is the nonlinear dynamic study of nonlinear and chaotic oscillations in InSb. The magneto-optical study of InSb provides a physical picture of the magneto-donor levels, which has an important impact on the physical model of nonlinear and chaotic oscillations. Thus, the subjects discussed in this thesi… more
Date: December 1991
Creator: Song, Xiang-Ning
Item Type: Refine your search to only Thesis or Dissertation
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A New Method for Measuring the Nuclear Hexadecapole Interaction in Some Solids

Description: A new method for measuring the nuclear hexadecapole interaction (HDI) in solids based on NMR quadrupole echoes is described. Theoretical values of the shifts of the quadrupole echo times caused by the HDI are given for two pulse and three pulse echoes in a nuclear spin 5/2 system. The method is applied to 1271 in an almost strain free crystal of KI and a hexadecapole coupling frequency (e2M16m16/h) of 630 Hz was found. Here e is the electronic charge, em16 is the fourth gradient of the external… more
Date: August 1991
Creator: Ni, QingWen
Item Type: Refine your search to only Thesis or Dissertation
open access

Ultrasensitive Technique for Measurement of Two-Photon Absorption

Description: Intensive demands have arisen to characterize nonlinear optical properties of materials for applications involving optical limiters, waveguide switches and bistable light switches. The technique of Pulse Delay Modulation is described which can monitor nonlinear changes in transmission with shot noise limited signal-to-noise ratios even in the presence of large background signals. The theoretical foundations of the experiment are presented followed by actual measurements of beam depletion due to… more
Date: December 1991
Creator: Miller, Steven A. (Steven Alan)
Item Type: Refine your search to only Thesis or Dissertation
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