Single-mode and single-polarization photonics with anchored-membrane waveguides

An integrated photonic platform with anchored-membrane structures, the T-Guide, is proposed and numerically investigated. These compact air-clad structures have high index contrast and are much more stable than prior membrane-type structures. Their semi-infinite geometry enables single-mode and single-polarization (SMSP) operation over unprecedented bandwidths. Modal simulations quantify this behavior, showing that an SMSP window of 2.75 octaves (1.2 - 8.1 {\mu}m) is feasible for silicon T-Guides, spanning almost the entire transparency range of silicon. Dispersion engineering for T-Guides yields broad regions of anomalous group velocity dispersion, rendering them a promising platform for nonlinear applications, such as wideband frequency conversion

The Design and Use of a Temperature-Compensated Hot-Film Anemometer System for Boundary-Layer Flow Transition Detection on Supersonic Aircraft

An airborne temperature-compensated hot-film anemometer system has been designed, fabricated, and used to obtain in-flight airfoil boundary-layer flow transition data by the NASA Ames-Dryden Flight Research Facility. Salient features of the anemometer include near constant sensitivity over the full flight envelope, installation without coaxial wiring, low-noise outputs, and self-contained signal conditioning with dynamic and steady-state outputs. The small size, low-power dissipation, and modular design make the anemometer suitable for use in modern high-performance research aircraft. Design of the temperature-compensated hot-film anemometer and its use for flow transition detection on a laminar flow flight research project are described. Also presented are data gathered in flight which is representative of the temperature-compensated hot-film anemometer operation at subsonic, transonic, and supersonic flight conditions

Development of a temperature-compensated hot-film anemometer system for boundary-layer transition detection on high-performance aircraft

A hot-film constant-temperature anemometer (CTA) system was flight-tested and evaluated as a candidate sensor for determining boundary-layer transition on high-performance aircraft. The hot-film gage withstood an extreme flow environment characterized by shock waves and high dynamic pressures, although sensitivity to the local total temperature with the CTA indicated the need for some form of temperature compensation. A temperature-compensation scheme was developed and two CTAs were modified and flight-tested on the F-104/Flight Test Fixture (FTF) facility at a variety of Mach numbers and altitudes, ranging from 0.4 to 1.8 and 5,000 to 40,000 ft respectively

Tracking the Field, Volume 3: Exploring Environmental Grantmaking

The third volume of Tracking the Field continues the advancement of data collected, analyzed, and presented to build a better understanding of the environmental philanthropic field. This data is fundamental to understanding environmental philanthropy overall. This volume captures U.S. foundations' initial response to the current economic crisis that began in 2008, and includes new innovations and a more comprehensive analysis of issues, strategies and global grantmaking by Environmental Grantmakers Association (EGA) members. Tracking the Field is part of a growing body of research of environmental funding trends across the globe, which includes Europe, Australia, and Canada. This report focuses both on overall U.S. environmental funding, as well as a deeper exploration of the EGA membership's grantmaking. Together with the interactive database available to members through EGA's website, Tracking the Field represents an evolving and innovative tool to enhance EGA members' ability to increase knowledge, coordination, and collaboration for enhancing the field

The Law and Black Folk

The Law and Black FolkDisturbing the Peace: Black Culture and the Police Power after Slavery by Bryan Wagner. Cambridge, MA: Harvard University Press, 2009. Pp. 307. $37.00 cloth

A comparison of the perceived effects of injury on collegiate dancers and athletes

This research study focused on sustained injuries to collegiate dancers and athletes and the physical and mental effects that followed the sustained injuries. The researcher used an electronic survey to gather quantitative and qualitative data. Quantitative data included average weekly hours of practice and conditioning, if an injury was sustained during participation of their activity, where the injury was sustained, and if medical treatment was provided to them through their universities. Qualitative data included whether the injured participants ever felt pressured to continue participation after an injury was sustained. This research study demonstrated that both collegiate dancers and athletes sustain injuries at a high rate and mainly to their lower bodies. While injured athletes had medical treatment provided to them, injured dancers had a much harder time seeking medical treatment because it was not provided to them through their universities