Our Own Dogs

Includes poem by Robert N. Zimmerman: Our Own Dog

An experimental investigation of high amplitude panel flutter

Aluminum panel flutter tests at supersonic Mach number

A method for predicting the panel flutter fatigue life of Saturn 5 panels

Development of method for predicting fatigue life of panels under flutter conditions with application to Saturn 5 launch vehicle structure

Contextualizing Cash Assistance and the South

In 1996, the U.S. Congress passed the Personal Responsibility and Work Opportunities Reconciliation Act creating the most recent welfare reform and the Temporary Assistance to Needy Families (TANF) program. Unlike Aid to Families with Dependent Children, which was an income-based entitlement program, with TANF came time limits, sanctions for noncompliance, and requirements that recipients participate in work or work-related activities. TANF is also a block grant program. As a result, not only did program requirements change, but they can now vary from state to state. This article provides a regional context for this special issue of Southern Rural Sociology by examining regional patterns in the provision of cash assistance. The South has a history of lower benefits and lower spending for cash assistance while at the same time having higher rates of poverty and persistent poverty. Under TANF, these regional patterns remain

An Unexpected Legacy: Women, Early Rural Sociological Research, and the Limits of Linearity

We often think of history in linear terms: past as prologue, one event following another, one year leading into the next. In a Rostowian-styled model of development, this kind of linear progression prefigures not only conceptualizations about the past, but also assumptions about the present. This paper reexamines the unexpected appearance of women and women’s lives embedded in early rural sociological research to consider how implicit assumptions about the past prefigure what we expect to “see” and influence the way we make sense of it

Simulated Radioisotope Thrust System and Component Development Final Report

Electrically heated and radioisotope heated thrusters for satellite attitude control and stationkeepin

Combinatiorial method for surface-confined sensor desing and fabrication

The procedure for the combinatorial fabrication of new sensing materials for cations and anions based on self-assembled monolayers (SAM) is discussed. A library of different sensitive substrates is generated by sequential deposition of fluorophores and small ligand molecules onto an amino-terminated SAM coated glass. The preorganization provided by the surface avoids the need for complex receptor design, allowing for a combinatorial approach to sensing systems based on individually deposited small molecules. Additionally the sensing system has been miniaturized to the microscale using microcontact printing and integrating the sensory SAMs on the walls of microchannels

On the design and simulation of an airlift loop bioreactor with microbubble generation by fluidic oscillation

Microbubble generation by a novel fluidic oscillator driven approach is analyzed, with a view to identifying the key design elements and their differences from standard approaches to airlift loop bioreactor design. The microbubble generation mechanism has been shown to achieve high mass transfer rates by the decrease of the bubble diameter, by hydrodynamic stabilization that avoids coalescence increasing the bubble diameter, and by longer residence times offsetting slower convection. The fluidic oscillator approach also decreases the friction losses in pipe networks and in nozzles/diffusers due to boundary layer disruption, so there is actually an energetic consumption savings in using this approach over steady flow. These dual advantages make the microbubble generation approach a promising component of a novel airlift loop bioreactor whose design is presented here. The equipment, control system for flow and temperature, and the optimization of the nozzle bank for the gas distribution system are presented. (C) 2009 The Institution of Chemical Engineers. Published by Elsevier B.V All rights reserved

Shaped Pupil Lyot Coronagraphs: High-Contrast Solutions for Restricted Focal Planes

Coronagraphs of the apodized pupil and shaped pupil varieties use the Fraunhofer diffraction properties of amplitude masks to create regions of high contrast in the vicinity of a target star. Here we present a hybrid coronagraph architecture in which a binary, hard-edged shaped pupil mask replaces the gray, smooth apodizer of the apodized pupil Lyot coronagraph (APLC). For any contrast and bandwidth goal in this configuration, as long as the prescribed region of contrast is restricted to a finite area in the image, a shaped pupil is the apodizer with the highest transmission. We relate the starlight cancellation mechanism to that of the conventional APLC. We introduce a new class of solutions in which the amplitude profile of the Lyot stop, instead of being fixed as a padded replica of the telescope aperture, is jointly optimized with the apodizer. Finally, we describe shaped pupil Lyot coronagraph (SPLC) designs for the baseline architecture of the Wide-Field Infrared Survey Telescope-Astrophysics Focused Telescope Assets (WFIRST-AFTA) coronagraph. These SPLCs help to enable two scientific objectives of the WFIRST-AFTA mission: (1) broadband spectroscopy to characterize exoplanet atmospheres in reflected starlight and (2) debris disk imaging.Comment: 41 pages, 15 figures; published in the JATIS special section on WFIRST-AFTA coronagraph