Exterior cloaking with active sources in two dimensional acoustics

We cloak a region from a known incident wave by surrounding the region with three or more devices that cancel out the field in the cloaked region without significantly radiating waves. Since very little waves reach scatterers within the cloaked region, the scattered field is small and the scatterers are for all practical purposes undetectable. The devices are multipolar point sources that can be determined from Green's formula and an addition theorem for Hankel functions. The cloaking devices are exterior to the cloaked region

MS

thesisThis endeavor describes the development of a parenteral admixture program in a 175-bed pediatric acute care hospital. It begins with a description of the advantage to the hospital of a parenteral admixture program as compared to conventional floor stock systems. Some examples of other admixture programs are cited along with specific characteristics of programs that could be applicable to any hospital. An outline is presented of the basic steps found in all programs. A detailed description is given illustrating how the program was actually developed in this hospital. This description includes items such as: 1) how space for the additive center was procured; 2) how a prediction of the workload was arrived at; 3) how the equipment for the center was procured; 4) how the pilot study was set up. This is followed by protocol for the admixture program. A discussion of data obtained during the development of this program includes: 1) how the I.V. usage rate of each was obtained; 2) how the amount of capital los due to the floor stock I.V. system was determined; 3) the amount of capital and the square feet of storage space tied up by the floor stock systems; 4) the amount of time save in the hospital by the additive system; and 5) and evaluation of how many personnel in the hospital were required per 100 I.V. solutions used before and after the additive system. The last chapter discusses the effectiveness of the admixture program based on previously established parameters. Some of the conclusions reached are as follows: 1) The program did save the hospitals money through more efficient use of time and equipment. a) Capital tied up in floor stock was greatly reduced. b) The program reduced the number of man-hours required to operate the I.V. therapy function in the hospital. This freed the nurses more from medication problems and gave them more time for bedside care. c) Checks were made to insure accuracy and also more care was taken in following established hospital policies regarding parenteral therapy as a result of the program. d) Solution and medications were all labeled properly and uniformly

Geology of the Old Speck Mountain Quadrangle

Guidebook for fifty-second annual meeting of the New England Intercollegiate Geological Conference field trips in West-Central Maine, October 8-9, 1960: Trip

Un estudio etnomatemático de las esteras (Pop) sagradas de los mayas

El contexto holístico de la etnomatemáticas busca estudiar, reflejar, y comprender las relaciones existentes entre los componentes del grupo cultural a través del análisis constante de cada individuo en el propio ambiente cultural. En este contexto, los mayas utilizaron padrones geométricos llamados de esteras o Pop que se tornaron sagrados. Esos padrones eran esculpidos en piedras, utilizados como joyas y dibujados en tejidos. Algunos objetos encontrados en México y en América Central muestran que los sacerdotes mayas tomaban ciertas decisiones basadas en las esteras sagradas, pues ellas contenían significados sagrados basados en valores finales de cada padrón. Los autores demuestran aspectos etnomatemáticos de la cultura maya que están basados en las pesquisas realizadas sobre las ideas y practicas matemáticas de este pueblo

OFF-FARM EMPLOYMENT DECISIONS BY MASSACHUSETTS FARM HOUSEHOLDS

The off-farm labor participation and supply decisions of Massachusetts farm families were estimated in a model which allows for joint decisions. The hypothesis of joint off-farm participation decisions by operators and spouses was rejected. However, there was some evidence that the hours supplied by the farm operator was dependent upon the decision by the spouse to work off-farm. Farm operators were found to respond to both family and farm characteristics in making participation and supply decisions. Spouses respond to the characteristics of the farm and family in participation decisions while family characteristics determined hours worked by the spouse.Consumer/Household Economics,

Three approaches in the research field of ethnomodeling: emic (local), etic (global), and dialogical (glocal)

The acquisition of both emic (local) and etic (global) knowledge is an alternative goal for the implementation of ethnomodeling research. Emic knowledge is essential for an intuitive and empathic understanding of mathematical ideas, procedures, and practices developed by the members of distinct cultural groups. It is essential for conducting effective ethnographic fieldwork. Furthermore, emic knowledge is a valuable source of inspiration for etic hypotheses. Etic knowledge is essential for cross-cultural comparisons, which are based on the components of ethnology. In this regard, such comparisons demand standard units and categories to facilitate communication. Dialogical (glocal) is a third approach for ethnomodeling research that makes use of both emic and etic knowledge traditions through processes of dialogue and interaction. Ethnomodeling is defined as the study of mathematical phenomena within a culture because it is a social construct and is culturally bound. Finally, the objective of this article is to show how we have come to use a combination of emic, etic and dialogical (glocal) approaches in our work in the area of ethnomodeling, which contributes to the acquisition of a more complete understanding of mathematical practices developed by the members of distinct cultural groups

Symmetrical freedom quilts: the ethnomathematics of ways of communication, liberation, and art

Symmetrical Freedom Quilts may be considered as links between mathematics, history, ethnomathematics, and the art of quilting. A quilt theme is a pedagogical way to integrate mathematics, art, and history in an interdisciplinary approach. This article combines an ethnomathematical-historical perspective by elaborating a history project related to the Underground Railroad. This work will allow teachers to develop classroom projects that help students to better understand geometry, especially concepts of symmetry and transformations. One of the objectives of this project is to stimulate student’s creativity and interest, because quilts may be considered as cultural and mathematical expressions of student’s daily life