Measurement Structures and Constraints in Compressive RF Systems

Publication in the conference proceedings of SampTA, Bremen, Germany, 201

Comparative costs of hydro-electric plants no. 3 & 4 of the New England Power Company of the Deerfield River at Shelburne Falls, Massachusetts

Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Civil and Sanitary Engineering, 1924.Includes bibliographical references (leaves ).Harry Goodman, Nathan Ginsburg.B.S

A New Approach to Developing Interactive Software Modules Through Graduate Education

Educational technology has attained significant importance as a mechanism for supporting experiential learning of science concepts. However, the growth of this mechanism is limited by the significant time and technical expertise needed to develop such products, particularly in specialized fields of science. We sought to test whether interactive, educational, online software modules can be developed effectively by students as a curriculum component of an advanced science course. We discuss a set of 15 such modules developed by Harvard University graduate students to demonstrate various concepts related to astronomy and physics. Their successful development of these modules demonstrates that online software tools for education and outreach on specialized topics can be produced while simultaneously fulfilling project-based learning objectives. We describe a set of technologies suitable for module development and present in detail four examples of modules developed by the students. We offer recommendations for incorporating educational software development within a graduate curriculum and conclude by discussing the relevance of this novel approach to new online learning environments like edX.Astronom

La gestión estratégica de recursos humanos en el Programa Integral Nacional para el Bienestar Familiar - INABIF, Sede Central - 2015

El objetivo de la investigación, fue determinar el nivel de la gestión estratégica de recursos humanos en el INABIF, Sede Central 2015, en ese sentido, el buen desempeño de los trabajadores es importante porque la gestión de los recursos humanos está ligada a la estrategia de la organización ya que los trabajadores son la fuente más importante para obtener ventajas competitivas. La metodología utilizada, en la investigación denominada “La gestión estratégica de recursos humanos en el Programa Integral Nacional de Bienestar Familiar – INABIF, Sede Central 2015”, es una investigación de tipo básico y diseño no experimental descriptiva por que no se manipuló deliberadamente la variable, tan solo se observó el fenómeno como se presentó en su contexto natural y describirse la relación que existió en la variable propuesta en un momento determinado. Se utilizó el software SPSS versión 20, para la elaboración de tablas de frecuencia y diagramas de barras, así como para las correlaciones de las variables. La confiabilidad del instrumento, se midió mediante el Kuder Richarson KR 20 y se halló un 0.78, lo que quiere decir que cualquier otra investigación utilizando la misma herramienta hallará el 78% de las veces el mismo resultado. Los principales resultados de la investigación, son que el 67.27 % de los trabajadores del INABIF encuestados perciben que la gestión estratégica es regular, mientras que solo el 32.73% creen que es buena. Esta percepción constituye una respuesta propia del momento que se origina por la noción o acción como consecuencia de percibir, es decir de tener la capacidad para recibir mediante los sentidos las imágenes, impresiones o sensaciones externas

Resolution and synthetic aperture characterization of sparse radar arrays

The concept of radar satellite constellations, or clusters, for synthetic aperture radar (SAR), moving target indicator (MTI), and other radar modes has been proposed and is currently under research. These constellations form an array that is sparsely populated and irregularly spaced; therefore, traditional matched filtering is inadequate for dealing with the constellation's radiation pattern. To aid in the design, analysis, and signal processing of radar satellite constellations and sparse arrays in general, the characterization of the resolution and ambiguity functions of such systems is investigated. We project the radar's received phase history versus five sensor parameters: time, frequency, and three-dimensional position, into a phase history in terms of two eigensensors that can be interpreted as the dimensions of a two-dimensional synthetic aperture. Then, the synthetic aperture expression is used to derive resolution and the ambiguity function. Simulations are presented to verify the theory

Preconditioning of murine mesenchymal stem cells synergistically enhanced immunomodulation and osteogenesis

Abstract Background Mesenchymal stem cells (MSCs) are capable of immunomodulation and tissue regeneration, highlighting their potential translational application for treating inflammatory bone disorders. MSC-mediated immunomodulation is regulated by proinflammatory cytokines and pathogen-associated molecular patterns such as lipopolysaccharide (LPS). Previous studies showed that MSCs exposed to interferon gamma (IFN-γ) and the proinflammatory cytokine tumor necrosis factor alpha (TNF-α) synergistically suppressed T-cell activation. Methods In the current study, we developed a novel preconditioning strategy for MSCs using LPS plus TNF-α to optimize the immunomodulating ability of MSCs on macrophage polarization. Results Preconditioned MSCs enhanced anti-inflammatory M2 macrophage marker expression (Arginase 1 and CD206) and decreased inflammatory M1 macrophage marker (TNF-α/IL-1Ra) expression using an in-vitro coculture model. Immunomodulation of MSCs on macrophages was significantly increased compared to the combination of IFN-γ plus TNF-α or single treatment controls. Increased osteogenic differentiation including alkaline phosphate activity and matrix mineralization was only observed in the LPS plus TNF-α preconditioned MSCs. Mechanistic studies showed that increased prostaglandin E2 (PGE2) production was associated with enhanced Arginase 1 expression. Selective cyclooxygenase-2 inhibition by Celecoxib decreased PGE2 production and Arginase 1 expression in cocultured macrophages. Conclusions The novel preconditioned MSCs have increased immunomodulation and bone regeneration potential and could be applied to the treatment of inflammatory bone disorders including periprosthetic osteolysis, fracture healing/nonunions, and osteonecrosis

La formación de la familia y la frecuencia con que se dan diversas relaciones de parentesco

Incluye Bibliografí