Στην εργασία αυτή μελετάμε το πρόβλημα της ύπαρξη ή μη καθολικών χώρων για διάφορες κλάσεις τοπολογικών χώρων. / In this project we study the problem of the existence or no of universal spaces for some classes of topological spaces

No description available.

We find the generating function for group tensors contained in the enveloping algebra of each simple compact group of rank three or less. The generating function depends on dummy variables which carry, as exponents, the degrees and representation labels of the tensors; it suggests an integrity basis, a finite number of elementary tensors, in terms of which all can be expressed as stretched tensor products. We show how the generating functions for tensors in the enveloping algebra of SO(5) and SU(3) reduce when the tensors are acting on the basis of representations for which one of the Cartan labels vanish. The missing label problem in the reduction SO(5) (R-HOOK) SO(3) restricted to SO(5) representations of the type (0,(nu)) is considered; the eigenvalues and eigenvectors of a missing label operator are found up to (including) representation (0,12).

No description available.

The use of universal or standard precautions by health care workers (HCWs) is essential to avoid exposure to blood and other body secretions that may transmit infectious diseases. Health care workers in Uganda often find it difficult to translate the principles of universal precautions into practice. Without appropriate use of universal precautions, disease transmission to HCWs may rise. In a resource-constrained environment such as Uganda however, nurses typically do not practice universal precautions unless they know the patients HIV or AIDS status. There is a need to understand the experiences and the context in which nurses practice universal precautions. Therefore, the purpose of this study was to explore the experience of Ugandan nurses and midwives in the practice of universal precautions and to identify factors that influence the use of universal precautions by nurses while caring for persons living with HIV and AIDS. A qualitative research approach, using a focused ethnography was used for the study.

Thesis (Ph. D.)--University of Chicago, Dept. of Anthropology, June 2001. / Includes bibliographical references. Also available on the Internet.

Thesis (M.S.)--Worcester Polytechnic Institute. / Title from title screen. Keywords: icons; pictorial; visual language; iconic communication; pidgins; interlingua. Includes bibliographical references (p. 294-301).

Historically, artificial neural networks have been loosely defined as biologically inspired computational models. When deciding what sort of network to use for a given task there are two things that need to be considered. The first is the representational power of the given network, that is what class of problems can be solved by this network? Given a set of problems to be solved by neural networks, a network that can solve any of these problems is called a universal approximator. The second problem is the ability to find a desired network given an initial network via a learning rule. Here we are interested in the question of universal approximation. A general definition of artificial neural networks is provided along with definitions for different kinds of universal approximation. We then prove that the recurrent temporal restricted Boltzmann machine (RTRBM) satisfies a general type of universal approximation for stochastic processes, an extention of previous results for the simple RBM. We conclude by examining the potential use of such temporal artificial neural networks in the biological process of perception. / Graduate

In this thesis two problems concerning linear transformations are discussed. Both problems involve linear transformations which are not in some sense semi-simple; otherwise they are unrelated. In part I we present a proof of the theorem that a linear transformation, of a finite dimensional vector space over a field, which has the property that the irreducible factors of its minimal polynomial are separable is the sum of a semi-simple linear transformation and a nilpotent linear transformation, which commute with the original transformation and are polynomials in the original transformation.. We present an example to show that such a decomposition is not always possible. In parts II and III we obtain some representation theorems for closed algebras of linear transformations on a Banach space which are generated by spectral operators. Since such an algebra is the direct sum of its radical and a space of continuous functions its radical can be investigated more readily than the radical of an arbitrary non-semi- simple commutative Banach algebra. In part II we remark that the reduction theory for rings of operators allows one to reduce the problem of representing a spectral operator, T, on a Hilbert space to the problem of representing a quasi-nilpotent operator. When T is of type m+1 and has a "simple" spectrum it is quite easy to obtain an explicit representation of T. In part III we consider spectral operators on a Banach space. We impose quite stringent conditions, hoping that the theorems obtained for these special cases will serve as a model for more general theorems. The knowledge obtained at least delimits the possibilities. We assume that T is of type m+1 and has a "simple" spectrum. One other condition, which is satisfied if the space, X, on which T acts is separable, is imposed. We are then able to obtain a representation of X as a function space. These function spaces are modelled on the analogy of the Orlicz spaces. We are also able to obtain a representation of the not necessarily semi-simple algebra generated by T and its associated projections as an algebra of functions. / Science, Faculty of / Mathematics, Department of / Graduate

En esta exposición revisaremos brevemente la historia de la K-teoría para llegar a la KK-teoría y finalmente a la kk-teoría, que describiremos un poco más detalladamente usando extensiones, en particular para el caso de c-álgebras.