Asymmetrical booster ascent guidance and control system design study. Volume 2: SSFS math models - Ascent

The engineering equations and mathematical models developed for use in the space shuttle functional simulator (SSFS) are presented, and include extensive revisions and additions to earlier documentation. Definitions of coordinate systems used by the SSFS models and coordinate tranformations are given, along with documentation of the flexible body mathematical models. The models were incorporated in the SSFS and are in the checkout stage

Why medical students choose not to carry out an intercalated BSc : a questionnaire study.

Peer reviewedPublisher PD

The Millennium Galaxy Catalogue: Star counts and the Structure of the Galactic Stellar Halo

We derive a star catalogue generated from the images taken as part of the 37.5 sq. deg Millennium Galaxy Catalogue. These data, alone and together with colours gained from the Sloan Digital Sky Survey Early Data Release, allow the analysis of faint star counts (B(MGC) < 20) at high Galactic latitude (41 < b < 63), as a function of Galactic longitude (239 < l < 353). We focus here on the inner stellar halo, providing robust limits on the amplitude of substructure and on the large-scale flattening. In line with previous results, the thick disk, an old, intermediate-metallicity population, is clearly seen in the colour-magnitude diagram. We find that the Galactic stellar halo within ~10 kpc (the bulk of the stellar mass) is significantly flattened, with an axial ratio of (c/a) =0.56 +/- 0.01, again consistent with previous results. Our analysis using counts-in-cells, angular correlation functions and the Lee 2D statistic, confirms tidal debris from the Sagittarius dwarf but finds little evidence for other substructure in the inner halo, at heliocentric distances of < 5 kpc. This new quantification of the smoothness in coordinate space limits the contribution of recent accretion/disruption to the build-up of the bulk of the stellar halo.Comment: Accepted for publication in MNRAS (figs 16 and 17 degraded here

Development of a Radioimmunoassay for Pig Pancreatic Kallikrein

Peer Reviewe

Validating a Normative Framework for Federal eGovernment: Preliminary Results

E-government has been identified as the next major application of information systems to fundamentally alter how U.S. federal agencies interact with the public. Through a strategy published by the Office of Management and Budget, federal agencies are formulating and executing plans to realize the many expected benefits from e-government. It is not clear, though, whether there is either a normative or empirical framework of e-government underpinning the strategy. Based on a normative framework of federal e-government created through this research, this paper presents a case study of an initiative in the federal e-government strategy, examining whether it conforms to the normative framework of federal e-government. This paper finds that there was not a consistent underlying e-government framework providing a foundation for this federal initiative. This finding raises questions about whether other federal e-government initiatives suffer a similar problem, calling into question the ultimate success of the U.S. federal e-government strategy

Asymmetrical booster guidance and control system design study. Volume 3: Space shuttle vehicle SRB actuator failure study

The investigation of single actuator failures on the space shuttle solid rocket booster required the analysis of both square pattern and diamond pattern actuator configurations. It was determined that for failures occuring near or prior to the region of maximum dynamic pressure, control gain adjustments can be used to achieve virtually nominal mid-boost vehicle behavior. A distinct worst case failure condition was established near staging that could significantly delay staging. It is recommended that the square pattern be retained as a viable alternative to the baseline diamond pattern because the staging transient is better controlled resulting in earlier staging

Racial/Ethnic Disparities in Meeting 5-2-1-0 Recommendations among Adolescents in the United States

BACKGROUND: Obesity prevention has become a major focus of public health efforts in the United States. The Federal Government set forth national nutrition and physical activity recommendations to prevent obesity and promote well-being among children. A succinct message developed through a program in Maine “Let’s Go! 5-2-1-0” summarizes these obesity prevention behaviors including ≥5 fruit and vegetables, ≤2 hours of screen time, ≥1 hour of physical activity, and 0 sugar sweetened beverages daily. The study evaluates racial/ethnic disparities among adolescents meeting the 5-2-1-0 targets in a nationally representative sample. METHODS: The 2011-2012 NHANES dataset was used to conduct a cross sectional analysis of Hispanic (n=287), non-Hispanic Black (n=321), Asian (n=145) and non-Hispanic White (n=234) adolescents 12-19 years old. The 5-2-1-0 targets were evaluated using dietary recalls, Global Physical Activity Questionnaire, and questions about sedentary activities. Differences in the proportion of racial/ethnic groups meeting the 5-2-1-0 targets were compared using chi-square tests. Logistic models accounting for the complex sampling design were used to evaluate racial/ethnic disparities in meeting the 5-2-1-0 targets. RESULTS: There were no adolescents that met all four 5-2-1-0 targets. Meeting individual targets and meeting none of the targets differed by racial/ethnic group. The study found 28% of White, 39% of Hispanic, 44% of Black and 35% of Asian adolescents met zero 5-2-1-0 targets. Adolescents from different racial/ethnic groups had increased odds of meeting no 5-2-1-0 targets compared to their White peers (adjusted odds ratio [95% Confidence Interval] – Hispanic: 1.76 [1.04-2.98], Black: 1.82[1.04-3.17], Asian: 1.48[1.08-2.04]). CONCLUSION: Understanding the uptake of national nutrition and physical activity recommendations is necessary to reduce future obesity and health consequences in adulthood. Despite national initiatives, adolescents in the United States are far from meeting the 5-2-1-0 targets and there are racial/ethnic disparities in meeting the recommendations

Preventive healthcare use, smoking, and alcohol use among Rhode Island women experiencing intimate partner violence

OBJECTIVE: Intimate partner violence (IPV) poses major health threats to women, including increased risk for several chronic health conditions. The impact of IPV on use of preventive health services is not well understood. Although several studies indicate that female victims of IPV have higher rates of alcohol abuse, this has not been replicated in population-based studies. The association of IPV with smoking has not been a major research focus. The purpose of this study was to examine the association between physical and psychological IPV in the past 12 months and preventive healthcare use, smoking, and alcohol use among women. METHODS: Data on 1643 women aged 18-54 from the 1999 Rhode Island Behavioral Risk Factor Surveillance System were analyzed. Logistic regression, controlling for age, race, marital status, education, insurance status, and functional disability, was used to model the associations of IPV with (1) checkups, (2) clinical breast examinations (CBEs), (3) Pap smear screening, (4) cigarette smoking, and (5) high-risk alcohol use. RESULTS: Prevalence of physical IPV was 4.1%. The prevalence of psychological IPV, in the absence of physical IPV was 4.5%. Physical IPV was associated with receiving regular Pap smears odds ratio ([OR] = 2.39, 95% confidence interval [CI] 1.01-5.70), current smoking (OR = 2.07, 95% CI 1.03-4.18), and high-risk alcohol use (OR = 4.85, 95% CI 2.02-11.60). Psychological IPV was associated with high-risk alcohol use (OR = 3.22, 95% CI 1.46-7.09). CONCLUSIONS: Women experiencing IPV regularly access preventive healthcare, providing healthcare providers with opportunities to assess and counsel women for IPV in addition to smoking and high-risk alcohol use

Developmental trends in voice onset time: some evidence for sex differences

This study reports on an investigation into the voice onset time (VOT) patterns of the plosives /p b t d/ in a group of 30 children aged 7 (n = 10), 9 (n = 10) and 11 (n = 10) years. Equal numbers of girls and boys participated in the study. Each child named a series of letter objects to elicit /p b t d/ in a syllable onset position with a fixed vowel context. VOT data were examined for age, sex and plosive differences with the following hypotheses: Firstly, that there would be sex differences in the VOT patterns of preadolescent children. Secondly, that the sex differences in VOT patterns would be linked to age and development, and that these would eventually become marked by the age of 11 years, by which time adult-like VOT values should have been achieved. Finally, that the extent of sex and age differences would be dependent upon the plosive being investigated. Results indicated patterns of decrease with age in the VOT values of /p b/ for the boys, with some evidence of increases in the VOT values of /t/ for the girls. In addition, 'voiced' and 'voiceless' cognates showed a more marked bimodal distribution in the girls' VOT patterns. This bimodal distribution was investigated by examining the degree of difference between the VOT values of voiced and voiceless cognate pairs /p b/ and /t d/, and examining the effects of age, sex and cognate pair. These results indicated that more marked sex differences in the 'voiced'/'voiceless' contrast emerged between the data of the 9- and 11-year-olds, a pattern, which was more marked for the alveolar plosives. These preliminary results confirmed all three hypotheses. The findings are presented and discussed both within a developmental and sociophonetic framework

Asymmetrical booster ascent guidance and control system design study. Volume 1: Summary

Dynamics and control, stability, and guidance analyses are summarized for the asymmetrical booster ascent guidance and control system design studies, performed in conjunction with space shuttle planning. The mathematical models developed for use in rigid body and flexible body versions of the NASA JSC space shuttle functional simulator are briefly discussed, along with information on the following: (1) space shuttle stability analysis using equations of motion for both pitch and lateral axes; (2) the computer program used to obtain stability margin; and (3) the guidance equations developed for the space shuttle powered flight phases