Structured Transition of Wind Tunnel Operations Skills from Government-to Contractor-Managed

In 2004, NASA awarded the Research, Operations, Maintenance, and Engineering (ROME) contract at NASA Langley Research Center to a team led by Jacobs Technology, Inc. A key component of the contract was the transitioning of the five large wind tunnel facilities from NASA managed and NASA or NASA/contractor workforces to fully contractor operated. The contractor would manage daily operations while NASA would continue to develop long-term strategies, make decisions regarding commitment of funds and commitment of facilities, and provide oversight of the contractor's performance. A major challenge would be the transition of knowledge of facility operations and maintenance from the incumbent civil servant workforce to the contractor workforce. While the contract has since been modified multiple times, resulting in a blended NASA/ROME workforce across the facilities, the processes developed and implemented to capture and document facility knowledge from the incumbent subject matter experts, build training and certification programs, and grow individual skills across subject areas and across facilities, are worthy of documentation. This is the purpose of this paper

Special Resident Canada Goose Hunting Seasons in Pennsylvania - Management Implications for Controlling Resident Canada Geese

Special hunting seasons were first implemented in 1992 to help reduce the growth rate of Pennsylvania\u27s rapidly expanding resident Canada goose (Branta canadensis) population. Special seasons timed to occur before and after fall migration were successful in harvesting resident and not migrant Canada geese. Since 1992, September and late season hunting opportunities have been gradually expanded to include the entire state. The special season harvest of resident Canada geese has increased from about 13,000 birds in 1992 to over 68,000 in 1999. Special hunting seasons now account for over 80% of the entire Canada goose kill in Pennsylvania. Despite the harvest increase, the resident goose population in Pennsylvania has continued to grow from 95,000 to over 250,000 since special seasons were first implemented. Canada goose direct band recovery and harvest rates have increased since the inception of special seasons in Pennsylvania. However, there is little evidence that harvest rates of suburban geese have increased and appear to be below that necessary to stabilize population growth. This limits the effectiveness of special seasons to remove problem geese in suburban settings, where most nuisance and damage complaints originate. Regulated hunting is the most cost effective method of controlling resident geese, but in suburban areas where hunting is often restricted, additional methods are needed to resolve nuisance and damage complaints

The Labor Force Participation Rate: A Rexamination Of The Determinants Of Its Decline

The U.S. Labor Force Participation Rate (LFPR) is defined as the number of people in the labor force as a percentage of the civilian noninstitutional population 16 years and over.  In a paper published in November, 2013, we examined the determinants of the decline in the LFPR from a 1998 peak of 67.2% to then, 63.3%.  Consensus of a number of economic studies at that time was that the primary determinant of the decline was cyclical and that an improving economy would stop, if not reverse, the downward trend. Since that time the unemployment rate has declined from 7.2% to 5.3%.  However, the LFPR has continued its decline to 62.6%.  Structural issues in the economy would appear to have far greater effect on LFPR decline than previously believed. In this paper we examine the following classes of structural determinants and their effects on LFPR: demographics, including not only the prime working cohort of ages 25 to 54, but also those of retirement age; the impact of a welfare system that appropriately provides a critical safety net, but one that reduces incentive to work through disability payments, extended unemployment benefits, and other subsidies;  education for both those of a higher level of attainment, as well as an underclass that no longer receives training by business, but must rely on both public and private vocational education; and finally the consequences of globalization on the economy, including the virtual disappearance of semi-skilled industries in the United States that heretofore have provided jobs for high school graduates

Construction of a "mutagenesis cartridge" for poliovirus genome-linked viral protein: Isolation and characterization of viable and nonviable mutants

By following a strategy of genetic analysis of poliovirus, we have constructed a synthetic "mutagenesis cartridge" spanning the genome-linked viral protein coding region and flanking cleavage sites in an infectious cDNA clone of the type 1 (Mahoney) genome. The insertion of new restriction sites within the infectious clone has allowed us to replace the wild-type sequences with short complementary pairs of synthetic oligonucleotides containing various mutations. A set of mutations have been made that create methionine codons within the genome-linked viral protein region. The resulting viruses have growth characteristics similar to wild type. Experiments that led to an alteration of the tyrosine residue responsible for the linkage to RNA have resulted in nonviable virus. In one mutant, proteolytic processing assayed in vitro appeared unimpaired by the mutation. We suggest that the position of the tyrosine residue is important for genome-linked viral protein function(s)

GTTC Future of Ground Testing Meta-Analysis of 20 Documents

National research, development, test, and evaluation ground testing capabilities in the United States are at risk. There is a lack of vision and consensus on what is and will be needed, contributing to a significant threat that ground test capabilities may not be able to meet the national security and industrial needs of the future. To support future decisions, the AIAA Ground Testing Technical Committees (GTTC) Future of Ground Test (FoGT) Working Group selected and reviewed 20 seminal documents related to the application and direction of ground testing. Each document was reviewed, with the content main points collected and organized into sections in the form of a gap analysis current state, future state, major challenges/gaps, and recommendations. This paper includes key findings and selected commentary by an editing team

The Labor Force Participation Rate: An Examination Of The Determinants Of Its Recent Precipitous Decline

The Labor Force Participation Rate (LFPR) is defined as those Americans in the labor force, i.e. above the age of sixteen, below retirement age, who are either actively employed or actively seeking employment.  From 1950 until 1998 it rose from 59.2% to 67.2%.  Given the near doubling of the U.S. population, its impact on our economy was enormous.  However, since 1998 the LFPR has declined steadily to 63.3%.  Parallel to this decline, we have seen a polarization of both wealth and income in the U.S.  Many economists have examined both trends – the decline of LFPR and inequality – and have put forth a variety of determinants.  These include technology and globalization – a decline or “hollowing out” of the middle class, if you will.  Also included are the demographics of an ageing society, and the increased racial and gender participation, but also a workforce that has become only marginally prepared by today’s educational institutions.  Another class of determinants is the welfare “safety net” at both the Federal and state levels, including extended unemployment benefits, disability payments and other subsidies.  The authors examine each class of determinants, including whether their aspects are cyclical, structural or even part of an ominous trend for our economy

Laser microsculpting for the generation of robust diffractive security markings on the surface of metals

AbstractWe report the development of a laser-based process for the direct writing (‘microsculpting’) of unique security markings (reflective phase holograms) on the surface of metals. In contrast to the common approaches used for unique marking of the metal products and components, e.g., polymer holographic stickers which are attached to metals as an adhesive tape, our process enables the generation of the security markings directly onto the metal surface and thus overcomes the problems with tampering and biocompatibility which are typical drawbacks of holographic stickers. The process uses 35ns laser pulses of wavelength 355nm to generate optically-smooth deformations on the metal surface using a localised laser melting process. Security markings (holographic structures) on 304-grade stainless steel surface are fabricated, and their resulted optical performance is tested using a He–Ne laser beam of 632.8nm wavelength