WorldCat Identities

Clark, N. A. (Noel Anthony) 1940-

Overview
Works: 37 works in 63 publications in 1 language and 495 library holdings
Genres: Conference papers and proceedings 
Roles: Editor, Other, Author
Publication Timeline
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Most widely held works about N. A Clark
 
Most widely held works by N. A Clark
Incommensurate crystals, liquid crystals, and quasi-crystals by J. F Scott( Book )

11 editions published between 1987 and 1988 in English and held by 228 WorldCat member libraries worldwide

In this NATO-sponsored Advanced Research Workshop we succeeded in bringing together approximately forty scientists working in the three main areas of structurally incommensurate materials: incommensurate crystals (primarily ferroelectric insulators), incommensurate liquid crystals, and metallic quasi-crystals. Although these three classes of materials are quite distinct, the commonality of the physics of the origin and descrip tion of these incommensurate structures is striking and evident in these proceedings. A measure of the success of this conference was the degree to which interaction among the three subgroups occurred; this was facili tated by approximately equal amounts of theory and experiment in the papers presented. We thank the University of Colorado for providing pleasant housing and conference facilities at a modest cost, and we are especially grate ful to Ann Underwood, who retyped all the manuscripts into camera-ready form. J.F. Scott Boulder, Colorado N.A. Clark v CONTENTS PART I: INCOMMENSURATE CRYSTALS A. Theory A PHENOMENOLOGICAL THEORY OF THE TRANSITION SEQUENCE INCLUDING AN INCOMMENSURATE (COMMENSURATE) PHASE SANDWICHED BY REENTRANT COMMENSURATE (INCOMMENSURATE) PHASE - Yoshihiro Ishibashi ... 1 DAUPHINE-TWIN DOMAIN CONFIGURATIONS IN QUARTZ AND ALUMINUM PHOSPHATE - M.B. Wa lker ... 9 ELASTIC AND INELASTIC SCATTERING FROM QUASI-PERIODIC STRUCTURES - T. Janssen and R. Currat ... 19 ARE EXOTIC CONSEQUENCES OF INCOMMENSURABILITY IN SOLIDS EXPERIMENTALLY OBSERVABLE? - J.B. Sokoloff. 35 B. Theory - Numerical l1ethods THE APPLICATION OF AXIAL ISING MODELS TO THE DESCRIPTION OF MODULATED ORDER - Julia Yeomans . . 45 TWO-DIMENSIONAL MODELS OF COMMENSURATE-INCOMMENSURATE PHASE TRANSITIONS - Palll D. Beale
Physics of complex and supermolecular fluids by International Symposium on Complex and Supermolecular Fluids( Book )

1 edition published in 1987 in English and held by 207 WorldCat member libraries worldwide

A collection of papers from the International Symposium on Complex and Supermolecular Fluids presents tutorials and minireviews focusing on the physical properties of complex fluids using the concepts and techniques of condensed matter physics. Stresses the unifying principles, rather than chemical details, behind the physics of diverse materials. Principal topics include colloids, microemulsions, ferrofluids, and micellar systems. Characterizes supermolecular and complex fluids by exploiting their analogies to atomic systems. Papers organized by physical phenomena and not by material
Proceedings of the third International Conference on Ferroelectric Liquid Crystals : june 23-28, 1991, Boulder, Colorado, USA by 1991, Boulder, Colo.) International Conference on Ferroelectric Liquid Crystals (3( Book )

10 editions published between 1991 and 1992 in English and held by 11 WorldCat member libraries worldwide

Ferroelectric liquid crystals : principles, properties, and applications by J. W. G Goodby( Book )

2 editions published in 1991 in English and held by 3 WorldCat member libraries worldwide

Proceedings of the third International Conference on Ferroelectric Liquid Crystals : june 23-28, 1991, Boulder, Colorado, USA by 1991, Boulder, Colo.) International Conference on Ferroelectric Liquid Crystals (3( Book )

2 editions published in 1991 in English and held by 3 WorldCat member libraries worldwide

Proceedings of ... International Symposium on Ferroelectric Liquid Crystals by International Symposium on Ferroelectric Liquid Crystals( Book )

3 editions published in 1993 in English and held by 3 WorldCat member libraries worldwide

Nanostructures of Liquid Crystal Phases by Dong Chen( )

1 edition published in 2012 in English and held by 2 WorldCat member libraries worldwide

Bent-core liquid crystals have attracted intense interest in recent years, exhibiting a wide variety of novel structural phenomena involving the interplay of chirality, molecular bend and molecular tilt. Freeze-fracture transmission electron microscopy together with other experimental methods has been used to characterize the nanostructures of bent-core liquid crystal phases in which the molecules undergo complex self-assembly, forming, for example, helical nanofilaments (the B4 phase), disordered focal conics (the DC phase), and layer undulations (the B7 phase) in the bulk. These studies have helped us better understand the complex nature of these and other liquid crystal phases. For example, the investigation of the chirality-preserving growth of the helical nanofilaments in the B4 phase will allow better control of its growth for applications, the discovery of the quasi-ordered toric focal conics of the DC phase at the air/liquid crystal interface opens the way for the development of two-dimensional or even three-dimensional periodic dielectric media for photonic crystal applications, the study of layer undulation defects reveals the detailed molecular arrangement in the B7 phase, and the discovery and characterization of the randomized twist grain boundary phase broads the understanding of chiral liquid crystal phases
Structure and Dynamics of Exotic Nematic Liquid Crystals by Dangnianmingyue( )

1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide

Exfoliated monolayer zirconium phosphate sheets (1microm diameter x 2.78 nm thick) in water form colloidal suspensions exhibiting liquid crystal (LC) ordering above a critical concentration. Studies of the phase behavior and phenomenology of such suspensions show that the LC is nematic, in agreement with theory, but that the predicted lamellar smectic phase does not appear. At high concentration lamellar correlations grow in the nematic but are limited in range, either by the finite size of the sheets or by defects in the sheets. Coexistence of the nematic with an isotropic phase is observed at all concentrations, indicating a long range attraction between the sheets. At high concentration the coexisting LC forms lens-shaped nematic tactoids, analysis of which enables estimates of the nematic elasticity and surface tension. Transmission electron microscopy reveals the bispherical internal structure of the nematic director field in the tactoids. Nematic cells with initial homeotropic orientation exhibit a periodic instability in the director field, which is unstable against the formation of a bend undulation of the sheets. This phenomenon, which is also observed in lyotropic colloidal suspensions of graphene oxide sheets, may be attributed to flexopolydispersity, the slow internal rearrangement of sheets of different size to optimize their spacing and thereby maximize entropy
Proceedings of ... International Symposium on Ferroelectric Liquid Crystals by International Symposium on Ferroelectric Liquid Crystals( Book )

2 editions published between 1987 and 1988 in English and held by 2 WorldCat member libraries worldwide

Linear and Nonlinear Optical Studies of Liquid Crystalline Materials by Ali S Alshomrany( )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

The electro optical response of liquid crystalline materials while displaying anisotropic properties, has led to numerous optical applications
Structure and Switching Dynamics in Ferroelectric Crystal and Liquid Crystal Thin Films( Book )

2 editions published between 1989 and 1993 in English and held by 2 WorldCat member libraries worldwide

The structure and switching dynamics of ferroelectric solid state and liquid crystal thin films were investigated experimentally using x-ray scattering, optical microscopy and microspectroscopy, and by raman spectroscopy. Applications of crystalline piezoelectric ferroelectric films, formed by sol gel and sputter deposition and ferroelectric liquid crystal devices were studied for application. Keywords: Ferroelectric crystals; Ferroelectric liquid crystals; Ferroelectric thin films
Structures and Analog Electro-Optics of Chiral De Vries and Polar Bent-Core Smectic A Liquid Crystals by Yongqiang Shen( )

1 edition published in 2013 in English and held by 2 WorldCat member libraries worldwide

In chiral smectic A (SmA*) liquid crystals (LCs), an applied electric field induces a tilt of the optic axis from the layer normal. When these materials are of the de Vries-type, the electroclinic tilt susceptibility is unusually large, with the field-induced director reorientation accompanied by a substantial increase in optical birefringence, essentially no change in the smectic layer spacing, and a polarization current response that has double peaks. In order to account for this behavior, we assume that the molecular orientation distribution in the smectic A has two degrees of freedom, azimuthal orientation and tilt of the molecular long axis from the layer normal, with the tilt confined to a narrow range of angles. We present a generalized Langevin-Debye model of the response of this distribution to applied field. The resultant evolution of this distribution with increasing applied field yields field-induced tilt, birefringence, and polarization dependence that agree well with experimental measurements
Magneto-optical response and magnetism of suspensions of ferromagnetic nanoplatelets in an isotropic solvent( )

1 edition published in 2014 in English and held by 2 WorldCat member libraries worldwide

Proceedings of ... International Symposium on Ferroelectric Liquid Crystals by International Symposium on Ferroelectric Liquid Crystals( Book )

2 editions published in 1991 in English and held by 2 WorldCat member libraries worldwide

Hydrodynamics of Inclusions in Freely Suspended Liquid Crystal Films by Zhiyuan Qi( )

1 edition published in 2015 in English and held by 2 WorldCat member libraries worldwide

Hydrodynamic interaction of pairs of circular inclusions in two-dimensional (2D), fluid smectic membranes suspended in air has been studied systematically. By analyzing their Brownian motion, it is found that the radial mutual mobilities of identical inclusions are independent of their size but that the angular coupling becomes strongly size-dependent when their radius exceeds a characteristic hydrodynamic length. These observations are described well for arbitrary inclusion separations by a model that generalizes the Levine/MacKintosh theory of point-force response functions and uses a boundary-element approach to calculate the mobility matrix for inclusions of finite extent. Beyond that, 2D flow fields generated by a rigid, oscillating post inserted in the film have been measured by analyzing the motion of tracer particles and provide a detailed understanding of the hydrodynamic behavior in the film/gas system. The Brownian diffusion of micron-scale inclusions in freely suspended smectic A liquid crystal films a few nanometers thick and several millimeters in diameter depends strongly on the air surrounding the film. Near atmospheric pressure, the three-dimensionally coupled film/gas system is well described by Hughes/Pailthorpe/White hydrodynamic theory but at lower pressure, the diffusion coefficient increases substantially, tending in high vacuum toward the two-dimensional limit where it is determined by film size. In the absence of air, the films are found to be a nearly ideal physical realization of a two-dimensional, incompressible Newtonian fluid
Build with the sun : a seminar for builders on solar domestic hot water systems, spring 1981 by Michel Tissier( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

Elementary building blocks of nematic disclination networks in densely packed 3D colloidal lattices( )

1 edition published in 2013 in English and held by 1 WorldCat member library worldwide

Nematic liquid crystals in frustrated environments are known to form a variety of topological defect conformations - possibly networks - with multiple meta-stable states of the nematic order. Here, we study the defect networks and their reconfigurability in a periodically spatially frustrated nematic, focusing specifically on the network formed in the nematic-filled voids of opal-like closely packed face centred cubic colloidal crystals. Using spherical colloidal particles with homeotropic anchoring, the liquid crystal fills a network of interconnected cavities with complicated surface-imposed conditions, generating a complex defect network of -1/2-winding number disclinations. We show that this network can be decomposed into a network of cubic and tetrahedral nematic elements, allowing us to enumerate the possible network conformations and use topological methods for their characterisation. We use combinatorics and geometry to predict all the possible conformations, their topology, and their free energy. The predictions are completely confirmed with numerical simulations. More generally, the presented results demonstrate an analytic approach towards achieving exactly addressable memory states in soft matter composite materials
Mean Field Theory of Liquid Crystalline Phases of Disc-Shaped Molecules( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

Ferroelectrics Volume 121 Numbers 1-4, 1991. Proceedings of the International Conference on Ferroelectric Liquid Crystals (3rd) Held in Boulder, Colorado on 23-28 June 1991. Part 1( )

1 edition published in 1992 in English and held by 1 WorldCat member library worldwide

The present volumes form the proceedings of the Third International Conference on Ferroelectric Liquid Crystals, held in Boulder, Colorado, USA June 23-28, 1991. These volumes continue the publication of this conference series, the proceedings of the first conference (1987) held at Bordeaux/Arcachon appearing in Volumes 84 and 85, and the proceedings of the second conference (1989) held at Goteborg appearing in Volumes 113 and 114. As for the two preceding conferences, FLC-91 provided a broad forum for the exchange of information on FLCs, with most of the groups working in the field well represented. Exciting developments were reported in all FLC areas. The worldwide effort at developing new FLC materials continues apace, with the report of an FLC material possessing a spontaneous polarization nearly equal to the sum of all transverse molecular dipoles, and new thrusts in polymer FLCs and FLCs for electronic nonlinear optical applications. The conference saw many new developments in FLC basic and device physics, including the use of dielectric spectroscopy as a tool for studying the molecular origins of the polarization in FLCs. Particularly exciting were the FLC device developments with the emergence of sophisticated FLC devices for opto-electronic computing, display, and other light control applications including a demonstration of a flexible polymer FLC display Ferroelectric Liquid Crystals, Liquid Crystals, Conference
Stroboscopic Microscopy of Fast Electro-Optic Switching in Ferroelectric Smectic C Liquid Crystals( Book )

1 edition published in 1981 in English and held by 1 WorldCat member library worldwide

 
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Alternative Names
Clark, N. A.

Clark, N. A. 1940-

Clark, N. A. (Noel Anthony), 1940-

Clark, Noel Anthony 1940-

Languages
English (47)