4,856 research outputs found
Surface effects and director profiles in liquid crystal-polymer structures with spatially varying surface conditions
No full textThis thesis presents a study of the role of surface effects in the reorientation mechanism in a photorefractive-like liquid crystal-polymer hybrid structure. The photorefractive properties of liquid crystals were first discovered in 1994. Liquid crystals are very attractive as photorefractive materials due to their high nonlinear optical response caused by collective molecular reorientation, which can be induced by light and applied electric field. They are also low cost compared with photorefractive crystals. Liquid crystals are also excellent adaptive materials, ideal for writing dynamic re-writable gratings. . Photorefractive effects have been observed in both pure liquid crystals and polymers such as PVK, but also in certain hybrid structures of both liquid crystal and polymer layers. Recent experiments have shown that these effects are only apparent for certain combinations of liquid crystals and polymer surface layer, suggesting the cause to be surface-mediated at the interface between the two, and not due to bulk effects in the liquid crystal or the polymer. In this thesis I present characterisation and analysis of such hybrid structures and discuss a hypothesis for the underlying mechanism, supported by experimental and theoretical investigation. When investigating surface effects, I also developed a system for characterisation of the molecular alignment in samples. This has been shown to be valid for molecular angles 0-16.30 and 48.8-900 from the surfaces. I also present an analysis of 'pretilt' measurement methods in which I have found the Crystal Rotation Method (CRM) to be most suited to our needs. I used this experimental method and the characterisation program to inspect cells that had been 'damaged' and exhibited long-term memory effects. I found that for some polymer-liquid crystal combinations, such as LC1294PVK, the surface 'damage' is due to applying electric field and light illumination. A mathematical model for liquid crystal reorientation under a spatially varying field is presented. This model is based on the Landau De-Gennes theory and is used to simulate photorefractive gratings in liquid crystal cells with varying thickness and grating size. It has been found that the grating spacing to cell thickness ratio governs the penetration of electric field into the liquid crystal bulk. These simulations are useful for predicting the conditions for highest diffraction efficiency. Finally, the birefringence measurements I carried out were used to validate the theoretical simulations and to obtain simulation parameters for the experimental cells investigatedEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Dr Hannah Graham on Australian leadership: Integrity, relational leadership and tenacious courage of conviction
No full textHannah Graham talks to Victor Perton about Australian Leadership. Criminologist, author and university lecturer Dr Hannah Graham was born in Tasmania and studied and worked at the University of Tasmania, before moving to Scotland to work in the Scottish Centre for Crime and Justice Research at the University of Stirling. Hannah has worked on justice and health-related projects with the EU, the Scottish Government, the Australian Government and Tasmanian Government, and she does ongoing research and writing on innovation and justice. Connect to Hannah on Twitter: @DrHannahGraham and @Innovative_Jus
Marriage record of Carter, Tom and Gilchrist, Agnes
No full textMarriage license for Tom Carter and Agnes Gilchrist. William S. Graham was the judge
The LOC tool: creating a learning object authoring tool for teachers
No full textAs technologies advance steadily into the educational sector so must teachers’ technical skills develop as they learn to work with them and understand their affordances. Tools for creating interactive online learning materials as webpages or ‘learning objects’ often assume a high level of technical ability in the user as well as an understanding of how to design online learning materials effectively. Although keen to take on new technologies, the classroom teacher may lack these skills. A University of Southampton team have sought to address these problems by creating the LOC (Learning Object Creator) Tool, an authoring tool contains an embedded pedagogic template guiding development of effective online learning materials. A one-day training workshop is sufficient to learn to use it. This paper outlines the development of the LOC Tool, explains the underlying pedagogic approach and describes how it is used by teachers to create learning objects in their own disciplines
Surface screening layers and dynamics of energy transfer in photosensitive polymer-liquid crystal structures
No full textThe dynamics of energy transfer in photoconductive polymer liquid crystal structures can contain important information on interface effects and surface electric fields contributing to the strength of liquid crystal reorientation gratings. The characteristic, transient effects observed during switching on and off of incident light or electric field can be explained by the presence of surface screening layers. Screening layers play an important role in the reorientation of liquid crystal director in cells with different alignment layers. Strong screening of external DC field is present not only in cells with a photoconductive polymer (56 V), but in standard cells with thicker (0.3 ?m) polyimide, aligning layers
Annual budget (Graham County, Ariz.)
No full textThe Board of Supervisors make an estimate of the different amounts required to meet the public expenditures/expenses for the ensuing year, also an estimate of revenues from sources other than direct taxation, and the amount to be raised by taxation upon real and personal property of Graham County.Electronic version includes only selected pages and lacks a title page
Stephen Graham Jones - Sowell Conference 2017
No full textStephen Graham Jones, University of Colorado-Boulder, author of "Mongrels" and "Growing Up Dead in Texas
Graham Greene An Approach to the Novels
No full textThis study reveals Greene in a dual role as author, one who projects literary experience into his view of life and subsequently projects both his experience and its "literary" interpretation into his fiction; and it defines two phases of Greenes novels through the changing relationship between writer and protagonists. The first phase progresses from acutely sensitive, self-divided young men somewhat like the young Greene to embittered, alienated characters ostensibly at great distance from their creator. The second phase (1939) includes a series of "portraits of the artist" through which Greene confronts more directly the tensions and conflicts of his private life.Book Cover -- Half-Title -- Title -- Copyright -- Dedication -- Contents -- Introduction -- Acknowledgements -- GRAHAM GREENE -- CHAPTER ONE Protagonists of the First Phase -- YOUTH -- DIVIDED SELVES -- WOMEN AND REDEMPTION -- MARRIAGE IN THE FIRST PHASE -- THE LITERARY FRAME -- THE FIRST-PHASE PROTAGONIST AND THE AUTHOR -- CHAPTER TWO Letters and Diaries -- LETTERS TO VIVIEN -- DIARIES -- CHAPTER THREE A Gun for Sale -- A GUN FOR SALE AND BROWNING'S "CHILDE ROLAND" -- A GUN FOR SALE AND TENNYSON'S MAUD -- CHAPTER FOUR Brighton Rock -- PINKIE AS NAPOLEONIC STRATEGIST -- CHARACTERS AND NAMES -- BRIGHTON ROCK AS A FAUSTIAN NOVEL -- CHAPTER FIVE Protagonists of the Second Phase -- AGE -- CHILDREN AND CHILDHOOD -- SELF-DIVISION -- MARRIAGE IN THE SECOND PHASE -- CHAPTER SIX The Strategy of Allusion in the Second Phase -- TOWARD THE WRITER AS PROTAGONIST -- CHAPTER SEVEN Portraits of the Artist -- CHAPTER EIGHT Travels with My Aunt -- CHAPTER NINE The Honorary Consul -- CHAPTER TEN The Human Factor -- CHAPTER ELEVEN Dr. Fischer of Geneva -- CHAPTER TWELVE Monsignor Quixote -- POSTSCRIPT: "YOUR DREAM HAS BEEN YOUR LIFE. -- CHAPTER THIRTEEN The Captain and the Enemy -- FINIS -- Selected Bibliography -- (A) WORKS BY GRAHAM GREENE -- (B) CRITICAL AND BIOGRAPHICAL WORKS -- Index -- Permissions Acknowledgements -- PENGUIN PUTNAM INC. -- SIMON & -- SCHUSTERThis study reveals Greene in a dual role as author, one who projects literary experience into his view of life and subsequently projects both his experience and its "literary" interpretation into his fiction; and it defines two phases of Greenes novels through the changing relationship between writer and protagonists. The first phase progresses from acutely sensitive, self-divided young men somewhat like the young Greene to embittered, alienated characters ostensibly at great distance from their creator. The second phase (1939) includes a series of "portraits of the artist" through which Greene confronts more directly the tensions and conflicts of his private life.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
The Massett-Graham Island Coal Company: the Nearest Coal Fields to Prince Rupert:
No full textThis little booklet is compiled to show the possibilities of the property controlled by this company in The Graham Island Coal Fields, near Prince Rupert, British Columbia Canada.--P. [1
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