2,298 research outputs found
Davis Family Papers (SC 489)
No full textFinding aid and scan (Click on additional files below) for Manuscripts Small Collection 489. Letters (4) written to T.P. or Leagralda (Mercer) Davis, Buras, Breckinridge County, Kentucky, containing family news and Mercer family genealogical sheet
Freeburg's Centennial Celebration, August 13-14-15-16.
No full text"The history of Freeburg compiled by Mrs. Lucille Wilderman Davis for Freeburg Centennial, 1959"--P. 9.T.p. on p. 9.Mode of access: Internet
Impecunious Davis : characteristic two-step march, polka and cake-walk / by Kerry Mills.
No full textFor piano solo."Kerry Mills’ two-step march."Note about Davis on p. 2.Illustrated title page: yellow, white and black; ill. of lounging African American.Advertisement for 4 piano works by Kerry Mills on t.p. verso; for 8 songs and piano pieces, and a collection with title Harding’s jigs and reels on p. [6]; for 9 songs on p. [7].Archived web conten
Geometric feature distributions for shape representation and recognition.
No full textOne of the fundamental problems in computer vision is the identification of objects from
their shape. The research reported in this thesis is directed toward the development of
a scheme for representing the shape of an object which allows it to be recognised both
quickly and robustly across a wide range of viewing conditions.
Given a shape described by a set of primitive elements, eg. straight line segments,
the proposed scheme involves using a histogram to record the distribution of geometric
features, eg. angle and distance, measured between pairs of primitives. This form
of shape representation has a number advantages over previously proposed schemes.
Foremost among these is the fact that it is able to produce local representations of
shape, based on individual line segments. Recognition based on such representation is
robust to the problems arising in cluttered scenes. Representations produced by the
scheme are also invariant to certain object transformations, they degrade gracefully
as the shape is fragmented and are strong enough to support discrimination between
dissimilar objects.
By treating the histogram recording a geometric feature distribution as a feature vector
it is possible to match shapes using techniques from statistical pattern classification.
This has the advantage that optimal matching accuracy can be achieved using processing which is both simple and uniform. The approach is therefore ideally suited to
implementation in dedicated hardware.
A detailed analysis is undertaken of the effect on recognition of changes in the description of a shape caused by fragmentation noise, scene clutter and sensor error. It is
found that the properties of both the representation and matching components of the
system combine to ensure that recognition is, in theory, unaffected by fragmentation
noise, while it is maintained to very high levels of scene clutter. The factors which
determine the effect of sensor error on the performance of the recognition system are
fully analysed.
The ability of the representational scheme to support object recognition is demonstrated in a number of different domains. The recognition of both 2D and 3D objects
from a fixed viewpoint is demonstrated in conditions of severe fragmentation noise,
occlusion and clutter. The scheme is then shown to extend straightforwardly to the
representation of 3D shape. This is exploited to perform recognition and localisation
of 3D objects from an arbitrary viewpoint, based on the matching of 3D scene and
,model shape descriptions. Finally, the use of the scheme within a multiple view-based
approach to 3D object recognition is demonstrated
Part of Lucian made English from the originall, in the yeare 1638 [electronic resource] /
No full textIncludes bibliographical references.Separate t.p. and pagination ([16], 200 p.): Certain select dialogues of Lucian, together with his true history / translated from the Greek into English by Mr. Francis Hickes ... [London] : Printed for Richard Davis ..., 1663.Imperfect: Vol. 1 with imprint date, 1663, is lacking in filmed copy.Reproduction of original in Huntington Library.WingElectronic reproduction
A funeral handkerchief [electronic resource] : in two parts : I. Part, containing arguments to comfort us at death of friends, II. Part, containing several uses which we ought to make of such losses : to which is added, Three sermons preached at Coventry /
No full textThe 2nd part has special t.p., continuous paging, and imprint: London : Printed for the author, 1691.Errata: prelim. p. [15].Imperfect: t.p. to the "Three sermons preached at Coventry" lacking.Includes bibliographical references.Reproduction of original in Huntington Library.WingElectronic reproduction
Transferência eletrônica em sistemas moleculares
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas, Programa de Pós-Graduação em Física, Florianópolis, 2012O presente trabalho apresenta uma análise teórica do fenômeno de transferência eletrônica (ET) para dois sistemas moleculares. Inicialmente é apresentada uma breve introdução sobre o processo de transferência eletrônica, seguida de uma descrição de seu papel em dispositivos fotovoltaicos orgânicos e poliméricos. Prossegue-se com uma descrição detalhada da teoria usada nesta dissertação e das diferentes técnicas computacionais utilizadas para realizar a propagação temporal de pacotes de onda eletrônicos em sistemas moleculares. Dois modelos físicos são investigados pelo formalismo. No primeiro caso apresenta-se uma análise do fenômeno de transferência eletrônica em um sistema doador-aceitador assistido por ponte: dois átomos de berílio atuam como o par doado-aceitador, para os quais a transferência é intermediada por uma estrutura molecular rígida (cadeia de polietileno) C17H36. Examinou-se as consequência para a transferência dos diferentes comprimentos de ligação que conectam doador e aceitador com a ponte, e a variação do número de unidades de etileno na ponte. Os cálculos demonstram a transição entre a transferência de carácter ôhmico e a super-trânsferência, em acordo com outros formalismos. O segundo modelo de estudo consiste de uma cadeia triatômica dinâmica idealizada para a investigação dos efeitos do movimento iônico sobre a dinâmica eletrônica. Fica evidenciado que em frequências nucleares baixas a dinâmica eletrônica é de carácter adiabático. Em contrapartida, frequências maiores conduzem à efeitos de carácter não adiabático.Abstract : This work presents a theoretical analysis of the electron transfer process for two types of molecular systems. It begins with a brief introduction about the electron transfer process, which is followed by a discussion about the relevance of the process to the operation of organic and polymeric photovoltaic devices. In the sequence, the relevant theory is explained in detail, particularly the computational methods that are used to time propagate electronic wavepackets in molecular structures. Two physical models are investigated with the formalism. In the first case, the analysis of the electron transfer mechanism is carried for a donor-acceptor system coupled by a bridge: two beryllium atoms act as the donor-acceptor pair, and the electronic transfer takes place through a rigid molecular structure (polyethylene chain) C17H36. The effects caused by changing bond lengths between donor/acceptor sites and the bridge as well as varying the number of ethylene units in the bridge were investigated. The calculations show a transition of the transfer behaviour from ohmic to super-exchange, in accordance with predictions made by different formalisms. The second model system consists of a tri-atomic dynamic chain, which is thought for studying the effects of the ionic motion on the electronic dynamics. The present study shows that the electronic dynamics is adiabatic at low nuclear frequencies whereas at high nuclear frequencies non-adiabatic effects arise
Voice Compression and Communications: Principles and Applications for Fixes and Wireless Channels
No full textUp-to-date, expert coverage of topics in wireless voice communications Voice communication is the most important facet of mobile radio service. Even when the predicted surge of wireless data and Internet services becomes a reality, voice will remain the most natural means of human communication. Voice Compression and Communications details issues in wireless voice communications and treats compression, channel coding, and wireless transmission as a joint subject. Part I covers background material, whereas Part II provides detailed information on both proprietary and standardized analysis-by-synthesis codecs, including the speech codecs of virtually all existing wireline-based and wireless systems. Parts III and IV discuss mainly research-based wideband, audio, as well as very low-rate schemes likely to find their way into future standards. Voice Compression and Communications describes fundamental concepts in a non-mathematical way early in the book for those with only a background knowledge of signal processing and communications. More advanced readers will find detailed discussions of theoretical principles, future concepts, and solutions to various specific wireless voice communications problems
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