Flight test of ARINC 741 configuration low gain SATCOM system on Boeing 747-400 aircraft

The Boeing company conducted a flight test of a SATCOM system similar to the ARINC 741 configuration on a production model 747-400. A flight plan was specifically designed to test the system over a wide variety of satellite elevations and aircraft attitudes as well as over land and sea. Interface bit errors, signal quality and aircraft position and navigational inputs were all recorded as a function of time. Special aircraft maneuvers were performed to demonstrate the potential for shadowing by aircraft structures. Both a compass rose test and the flight test indicated that shadowing from the tail is insignificant for the 747-400. However, satellite elevation angles below the aircraft horizon during banking maneuvers were shown to have a significant deleterious effect on SATCOM communications

Trends in Outcomes for Young People with Disabilities: Are We Making Progress?

This paper uses the Current Population Survey (CPS) from 1981-2000 to compare long term trends in socio-economic outcomes for youth (aged 15-21) and young adults (aged 22-29) with work limitations to those for youth and young adults without work limitations. We focus on the years 1988 and 1999: years that roughly correspond to the peaks of successive business cycles. We find that prevalence of work limitations declined for males but increased for females, mostly accounted for by growth for African American females. Despite a substantial reduction in the educational attainment gap between young adults with and without disabilities, gaps in employment, earnings, dependency on public programs and poverty widened substantially. These trends could be due to factors that determine whether individuals report themselves to be work-limited, factors that affect individual outcomes regardless of self-reported work limitation status, or both sets of factors

Enhancing Single Walled Carbon Nanotube Deposition For The Study Of Extracellular Analytes

Extracellular signaling is a dynamic process responsible for coordinating large scale biological processes. As such, understanding extracellular signaling is important to our determination of normal function and pathophysiological development. High resolution spatial and temporal information are critical to completely understanding these processes. Unfortunately, current methods of detection are lacking in either spatial or temporal resolution of extracellular products, limiting researchers’ ability to understand complex biological processes. A new group of sensors based on fluorescent single walled carbon nanotubes (SWNT) have shown the potential to provide both high quality spatial and temporal resolution for the sensing of analytes. However, while SWNT has already been used extensively as an intracellular probe, it has seldom been used for intercellular monitoring. In the few instances that SWNT has been used to form extracellular sensor arrays the deposition method has relied on electrostatic or non-specific interactions and is not well characterized. Herein a new method of SWNT deposition based on the avidin-biotin bond was developed, where biotin activity was imparted to SWNT via coupling to its DNA wrapping and avidin was covalently immobilized on the surface of a glass slide. The method of SWNT immobilization produced a twofold enhancement in SWNT deposition over the current standard without negatively impacting SWNT spectral properties, distribution, response time, or degradation rates. These results indicate the effectiveness of this method for increasing SWNT deposition and provide a simple pathway for enhancing the deposition of DNA-SWNT complexes. Advisor: Nicole M. Iverso

Dismantling the Poverty Trap: Disability Policy for the 21st Century. Policy Brief

Working-age Americans with disabilities are much more likely to live in poverty than other Americans and generally did not share in the economic prosperity of the late 1990s. At the same time, public expenditures to support them are growing at a rate that will be difficult to sustain when the baby boom generation retires and begins to draw Social Security Retirement and Medicare benefits. We argue that this discouraging situation will continue unless we can bring disability programs into line with more contemporary understanding of the capabilities of people with disabilities and successfully implement broad, systemic reforms to promote their economic self-sufficiency. This policy brief summarizes a larger paper (Stapleton, O’Day, Livermore & Imparato, 2005). It suggests principles to guide reforms and encourage debate. Future policy briefs will elaborate on some of these principles

The Health Care Financing Maze for Working-Age People with Disabilities

Much of the research on health care financing for people with disabilities has focused on the Medicaid and Medicare programs. The findings of this research often highlight the inadequacies of those programs in providing appropriate services to address the special needs of people with disabilities. A focus on these large programs, however, obscures the role of other public and private insurers, as well as the role of programs that provide many additional services to this population – all of which add complexity to the system. The purpose of this paper is to describe the health care financing system as a whole, including the large public programs, other public and private insurers, and the many other programs that provide additional services. The description of the system highlights structural problems that need to be addressed in order to substantially improve the delivery of health and related services to people with disabilities. In the next section, we describe each source of health care financing for working-age people with disabilities and highlight its implications for service delivery and quality of life. In the concluding section, we describe the key structural shortcomings of the current financing system, assess the extent to which current reform efforts are addressing these shortcomings, and discuss the implications for broader efforts to reform health care financing system

Enhancing Single Walled Carbon Nanotube Deposition For The Study Of Extracellular Analytes

Extracellular signaling is a dynamic process responsible for coordinating large scale biological processes. As such, understanding extracellular signaling is important to our determination of normal function and pathophysiological development. High resolution spatial and temporal information are critical to completely understanding these processes. Unfortunately, current methods of detection are lacking in either spatial or temporal resolution of extracellular products, limiting researchers’ ability to understand complex biological processes. A new group of sensors based on fluorescent single walled carbon nanotubes (SWNT) have shown the potential to provide both high quality spatial and temporal resolution for the sensing of analytes. However, while SWNT has already been used extensively as an intracellular probe, it has seldom been used for intercellular monitoring. In the few instances that SWNT has been used to form extracellular sensor arrays the deposition method has relied on electrostatic or non-specific interactions and is not well characterized. Herein a new method of SWNT deposition based on the avidin-biotin bond was developed, where biotin activity was imparted to SWNT via coupling to its DNA wrapping and avidin was covalently immobilized on the surface of a glass slide. The method of SWNT immobilization produced a twofold enhancement in SWNT deposition over the current standard without negatively impacting SWNT spectral properties, distribution, response time, or degradation rates. These results indicate the effectiveness of this method for increasing SWNT deposition and provide a simple pathway for enhancing the deposition of DNA-SWNT complexes. Advisor: Nicole M. Iverso

Study of the stability of the S-IC open-loop propellant-hydraulic system Final report, Jul. 26, 1964 - Jul. 26, 1966

Saturn S-IC open-loop propellant-hydraulic system stud

Dismantling the Poverty Trap: Disability Policy for the Twenty-First Century

Working-age people with disabilities are much more likely than people without disabilities to live in poverty and not be employed or have shared in the economic prosperity of the late 1990s. Today’s disability policies, which remain rooted in paternalism, create a “poverty trap” that recent reforms have not resolved. This discouraging situation will continue unless broad, systemic reforms promoting economic self-sufficiency are implemented, in line with more modern thinking about disability. Indeed, the implementation of such reforms may be the only way to protect people with disabilities from the probable loss of benefits if the federal government cuts funding for entitlement programs. This article suggests some principles to guide reforms and encourage debate and asks whether such comprehensive reforms can be successfully designed and implemented

The Economics of Policies and Programs Affecting the Employment of People with Disabilities

Over the last several decades, there has been a movement toward the inclusion of people with disabilities in mainstream social institutions. The 1990 Americans with Disabilities Act (ADA), which supports the full participation of people with disabilities in society and mainstream institutions, illustrates the shift in attitudes toward people with disabilities. Rather than being perceived as having a social or medical problem, individuals with disabilities are increasingly viewed as people with challenges that can be solved if appropriate policies and supports are available for addressing them