Management of Science

NASA concept, philosophy, and approach to science managemen

Compendium of fracture mechanics problems

Fracture mechanics analysis results are presented from the following structures/components analyzed at Marshall Space Flight Center (MSFC) between 1982 and 1989: space shuttle main engine (SSME), Hubble Space Telescope (HST), external tank attach ring, B-1 stand LOX inner tank, and solid rocket booster (SRB). Results from the SSME high pressure fuel turbopump (HPFTP) second stage blade parametric analysis determine a critical flaw size for a wide variety of stress intensity values. The engine 0212 failure analysis was a time dependent fracture life assessment. Results indicated that the disk ruptured due to an overspeed condition. Results also indicated that very small flaws in the curvic coupling area could propagate and lead to failure under normal operating conditions. It was strongly recommended that a nondestructive evaluation inspection schedule be implemented. The main ring of the HST, scheduled to launch in 1990, was analyzed by safe-life and fail-safe analyses. First safe-life inspection criteria curves for the ring inner and outer skins and the fore and aft channels were derived. Afterwards the skins and channels were determined to be fail-safe by analysis. A conservative safe-life analysis was done on the 270 redesign external tank attach ring. Results from the analysis were used to determine the nondestructive evaluation technique required

Supports for Working Families: Work and Care Policies across Welfare States

Familienpolitik, Sozialpolitik, Sozialstaat, Eltern, Erwerbstätigkeit, Familie, Kinderbetreuung, Vereinigte Staaten, Westeuropa, Family policy, Social policy, Welfare state, Parents, Labour force participation, Family, Child care, United states, Western

Feasibility model of a high reliability five-year tape transport. Volume 3: Appendices

Detailed drawings of the five year tape transport are presented. Analytical tools used in the various analyses are described. These analyses include: tape guidance, tape stress over crowned rollers, tape pack stress program, response (computer) program, and control system electronics description

Challenges in Modeling the Effects of Trade Agreements on the Agricultural Sector

Major issues and challenges encountered in modeling and analyzing agricultural and trade policy reforms are reviewed. We focus on the modeling approach and pay special attention to the type and scope of the models, the calibration of a realistic baseline scenario, the representation of the reform agreement, the use of extra-model information, the choice of metrics to measure reform impacts, and emerging issues in policy modeling. Existing solutions and unresolved issues are examined. We stress the complementarity of various modeling approaches in assessing policy reforms and the importance of helping users understand the limitations of the chosen approach. Keywords: agricultural policy, economic modeling, trade agreements. JEL classification: Q17, Q18, F13

What Makes an Efficacious Elementary Principal? A Qualitative Study

Quality induction programming for novice principals should promote experiences that build self-efficacy (Tschannen-Moran & Gareis, 2007). Critical induction experiences are necessary to prepare school leaders for the increasing demands of the role. In the ever-changing world of public education, the importance of high-impact experiences for new principals has never been more critical than it is today. The purpose of this qualitative study is to explore the experiences that develop feelings of self-efficacy in novice elementary principals. A descriptive approach was used to examine the perspectives of seven practicing elementary principals at various stages of their careers. Results from the study suggest feelings of self-efficacy increased when study participants described experiences related to four themes: Collective Teacher Efficacy, Positive School Culture, Supportive Relationships, and Emotional Self-Awareness

Associations Between Climate, Latitude, Fertility and the Decline of the US Sex Ratio at Birth

The US sex ratio at birth (SRB) has declined since 1970, while ambient temperatures have been increasing. This study examines the temporal and spatial variation of the US SRB from 1979–2002 in association with fertility rates and climate variables. Approximately 62.8 million birth records from the National Center for Health Statistics were linked to monthly climate division data and county level socioeconomic variables to evaluate the association of SRB and environmental conditions at or near the time of conception. Seasonal variation in US SRB is detectable in time series analysis, and is somewhat in phase with variation in fertility. Logistic regression analysis shows that temperature in the month before conception is significantly positively correlated with the likelihood of a male birth when birth order, maternal age, maternal education, plurality, gestation length, race, and Hispanic origin are controlled. This association was significant in models that include all births from 1979–1988, non-Hispanic white births from 1979–1988, and all births in US large counties from 1979–2002. Geographic nonstationarity of US SRB was found in smoothed rate climate division maps for 1979–1988, with higher SRB in latitudes below 40 degrees N, especially in the southeastern US. However, both the overall rates of summer conception and the likelihood of summer male conception are reduced in lower latitudes relative to higher ones. A logistic regression model was also fit using only non-Hispanic births from US large counties from 1989–2002. In addition to a significant positive association of sex ratio and temperature in the month before conception, deviation from normal monthly temperature during the month of conception, compared to the 1971–2000 baseline temperature, is significantly associated with sex ratio variation. In this population, fewer males were conceived when temperature extremes were significantly above normal; more males were conceived when temperatures were significantly below normal. In both high and low latitude zones over this period, the peak of male conceptions shifted to earlier in the year. Variation in SRB is potentially a sentinel health event and this research suggests that the association between temperature and SRB should be integral to any study of SRB variation across large geographic areas or long time periods

Nagual interpretations

Not Include

Field-of-Use Restrictions as Precompetitive Elements in Patent and Know-How Licensing Agreements in the United States and the European Communities

The courts of both the United States and the European Communities have upheld the legality of various licensing restrictions. One such restriction, the field-of-use restriction, is the subject of this article. A field-of-use restriction prohibits a licensee from realizing the benefits of the license in certain technical fields. Field-of-use restrictions are usually written as restricting use to a particular field rather than listing prohibited fields… This article first sets forth an economic justification for the legality of field-of-use restrictions, concluding that such restrictions are usually pro-competitive. The article then analyzes the relevant law in both the United States and the European Communities… The article concludes that the legal structure governing licensing agreements in the European Communities provides more predictable and useful guidance in drafting transnational licensing agreements