107,508 research outputs found
Inverse scattering for a locally perturbed half-plane
No full textWe consider the inverse problem to determine the shape of a local perturbation of a perfectly conducting plate from a knowledge of the far-field pattern of the scattering of TM polarized time-harmonic electromagnetic waves by reformulating it as an inverse scattering problem for a planar domain with corners. For its approximate solution we propose a regularized Newton iteration scheme. For a foundation of Newton type methods we establish thr Frechet differentiability of the solution to the scattering problem with respect to the boundary and investigate the injectivity of the linearized mapping. Some numerical examples of the feasibility of the method are presented. For the sake of completeness, the first part of the paper outlines the solution of the direct scattering problem via an integral equation of the first kind including the numerical solution
1973 Art Kress
No full textAlt Text: Headshot of UNI men\u27s track and field teammate Art Kress. He stands outside wearing glasses and a dark UNI TRACK t-shirt. Black and white image.https://scholarworks.uni.edu/panther_athletics/1737/thumbnail.jp
[Missouri-Kansas-Texas Railroad Round House, Denison, Texas]
No full textDate refers to postmark. Recto: [imprinted] M. K. & T. Round House, Denison, Texas. Verso: [imprinted] Published by S. H. Kress & Co. Made in U. S. A. [postmarked] Lindale, Tex. Dec 16, 6 PM, 1913. [handwritten note and address not transcribed]
Semiótica Social e Multimodalidade pelas lentes de Kress / Social Semiotics and Multimodality through the Lenses of Kress
No full textResumo: Este trabalho traz uma discussão sobre Semiótica Social e Multimodalidade. Para tanto, fazemos um levantamento das principais obras que marcam o pensamento de Gunther Kress e colaboradores. Nesse sentido, ao revisitar suas obras, encontramos a presença de formulações teóricas de Michael Halliday (1978) que ancoram a visão sociossemiótica como escolha, interesse, signo motivado, todas funções que norteiam uma visão específica de linguagem e de gramática. No escopo da teoria, encontramos as contribuições do pensamento Kressiano sobre multimodalidade com interesse em explorar as formas de significação moderna. Assim, a partir desses princípios, apresentamos um conjunto de pesquisas que trazem reflexões do seu pensamento para os estudos da linguagem e comunicação. Abstract: This article provides a discussion on Multimodal Social Semiotics. For this purpose, we gather the main works that represent the thinking of Gunther Kress and collaborators. In this sense, when reviewing his works, we found Michael Halliday’s (1978) theoretical formulations that grounded the sociosemiotic vision such as choice, interest, motivated sign, all functions that guide a specific vision of language and grammar. In the scope of the theory, we find the contributions of Kressian thought on multimodality with an interest in exploring the forms of modern meaning. Thus, based on these principles, we present a set of research that brings reflections of his thinking to the studies of language and communication
Beyond Curve Fitting? Comment on Liu, Mayer-Kress, and Newell (2003)
No full textY.-T. Liu, G. Mayer-Kress, and K. M. Newell (2003) fit learning curves to movement time data and suggested 2 new methods for analyzing learning. They claimed that the methods go "beyond curve fitting." However, in neither their curve fitting nor their new methods is measurement noise accounted for, and therefore they produce inefficient and biased results. Using the data of Liu et al., in which variance caused by learning is small relative to the level of noise for most participants, the present authors demonstrate those problems and provide better alternatives that are more noise tolerant, more powerful, and go beyond curve fitting without displaying the extreme bias produced by the methods of Liu et al
Letter, [Author unclear] to Paulina T. Merritt
No full textHandwritten letter to Paulina Merritt from an unknown author, October 1, 1876.
Expression of HTLV-1 genes in T-Cells using RNA electroporation
No full textHuman T-cell leukemia virus type 1 (HTLV-1) infects about 20 million people world-wide. Around 5% of the infected individuals develop adult T-cell leukemia (ATL) or a neurological disease termed tropical spastic paraparesis (TSP) after a clinical latency of years to decades. Through the use of two promoters and alternative splicing HTLV-1 expresses at least 12 different proteins. HTLV-1 establishes a life-long persistent infection by inducing the clonal expansion of infected cells, a property largely ascribed to the viral genes Tax and HBZ. However, the fact that ATL arises in a minority of infected individuals after a long clinical latency suggests the existence of factors counterbalancing the oncogenic potential of HTLV-1 in the context of natural infection. To study the role of the different HTLV-1 gene products in the HTLV-1 life cycle, we optimized a transfection protocol for primary T-cells using an approach based on the electroporation of in vitro-transcribed RNA. Results showed that the RNA transfection technique combines a high transfection efficiency with low toxicity, not only in Jurkat T-cells but also in primary T-cells. These findings suggest that RNA electroporation is preferable for experiments aimed at investigating the role of HTLV-1 gene products in the context of primary T-cells, which represent the main target of HTLV-1 in vivo
Letter from Upton Sinclair to Melville L. Kress - August 11, 1944
No full textA letter from Upton Sinclair to Melville Kress, dated August 11th, 1944, in which Sinclair sends Kress an issue of 'The Saturday Review' which don�t mention Sinclair's books and muses that Kress should write them a letter on the subject
On a two-dimensional inverse scattering problem for a dielectric
No full textThe inverse problem under consideration is to reconstruct the shape of a homogeneous dielectric infinite cylinder from the far-field pattern for scattering of a time-harmonic E-polarized electromagnetic plane wave. We propose an inverse algorithm that extends the approach suggested by Johansson and Sleeman [T. Johansson and B. Sleeman, Reconstruction of an acoustically sound-soft obstacle from one incident field and the far-field pattern, IMA J. Appl. Math. 72 (2007), pp. 96-112] for the case of the inverse problem for a perfectly conducting scatterer. It is based on a system of nonlinear boundary integral equations associated with a single-layer potential approach to solve the forward scattering problem. We present the mathematical foundations of the method and exhibit its feasibility by numerical examples
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