Models for UT Inspection of Bolthole Cracks in Layered Structures

Due to the geometrical complexities of bolted, layered airframe structures, the application of Model Assisted Probability of Detection, or MAPOD, is an important tool for helping to assess the ultrasonic inspectability of those components. Of particular importance is the need to inspect for cracks on or near boltholes in those structures. This presentation describes the development and testing of analytical computer models of and their application to bolthole crack inspection. The modeling approach includes approximate, paraxial, bulk-wave models as well as more rigorous, analytical models that include both bulk and surface/plate modes. The simpler models have the flexibility and computational efficiency to handle complex geometries and structures. The more exact, rigorous models apply to simpler, canonical geometries for use in benchmarking and assessing the accuracy of the paraxial models. Previous model results for single layers will be reviewed and application of the models to multiple layers will be highlighted. Extensions of the models to more complex geometries and materials, computational challenges to future model development, and applications of the models to MAPOD, and will also be addressed

Bt Corn, Insecticidal Seed Treatments, and Soil Insecticides for Managing Corn Rootworms: Experiences from 2004, Issues for 2005

The corn rootworm management situation in Illinois in 2004 can be characterized with four statements

Light drinking versus abstinence in pregnancy : behavioural and cognitive outcomes in 7-year-old children : a longitudinal cohort study

To assess whether light drinking in pregnancy is linked to unfavourable developmental outcomes in children. Design Prospective population-based cohort. Setting UK. Population Ten thousand five hundred and thirty-four 7-year-olds. Methods Quasi-experimental using propensity score matching (PSM) to compare children born to light (up to 2 units per week) and non-drinkers. Main outcome measures Behavioural difficulties rated by parents and teachers; cognitive test scores for reading, maths and spatial skills. Results Ordinary least squares (OLS) regression and PSM analyses are presented. For behavioural difficulties, unadjusted estimates for percentage standard deviation (SD) score differences ranged from 2 to 14%. On adjustment for potential confounders, differences were attenuated, with a loss of statistical significance, except for teacher-rated boys' difficulties. For boys, parent-rated behavioural difficulties: unadjusted, −11.5; OLS, −4.3; PSM, −6.8; teacher-rated behavioural difficulties: unadjusted, −13.9; OLS, −9.6; PSM, −10.8. For girls, parent-rated behavioural difficulties: unadjusted, −9.6; OLS, −2.9; PSM, −4.5; teacher-rated behavioural difficulties: unadjusted, −2.4; OLS, 4.9; PSM, 3.9. For cognitive test scores, unadjusted estimates for differences ranged between 12 and 21% of an SD score for reading, maths and spatial skills. After adjustment for potential confounders, estimates were reduced, but remained statistically significantly different for reading and for spatial skills in boys. For boys, reading: unadjusted, 20.9; OLS, 8.3; PSM, 7.3; maths: unadjusted, 14.7; OLS, 5.0; PSM, 6.5; spatial skills: unadjusted, 16.2; OLS, 7.6; PSM, 8.1. For girls, reading: unadjusted, 11.6; OLS, −0.3; PSM, −0.5; maths: unadjusted, 12.9; OLS, 4.3; PSM, 3.9; spatial skills: unadjusted, 16.2; OLS, 7.7; PSM, 6.4. Conclusion The findings suggest that light drinking during pregnancy is not linked to developmental problems in mid-childhood. These findings support current UK Department of Health guidelines on drinking during pregnancy

Light drinking during pregnancy : still no increased risk for socioemotional difficulties or cognitive deficits at 5 years of age?

Background This study examines the relationship between light drinking during pregnancy and the risk of socioemotional problems and cognitive deficits at age 5 years. Methods Data from the nationally representative prospective UK Millennium Cohort Study (N=11 513) were used. Participants were grouped according to mothers' reported alcohol consumption during pregnancy: never drinker; not in pregnancy; light; moderate; heavy/binge. At age 5 years the strengths and difficulties questionnaire (SDQ) and British ability scales (BAS) tests were administered during home interviews. Defined clinically relevant cut-offs on the SDQ and standardised scores for the BAS subscales were used. Results Boys and girls born to light drinkers were less likely to have high total difficulties (for boys 6.6% vs 9.6%, OR=0.67, for girls 4.3% vs 6.2%, OR=0.69) and hyperactivity (for boys 10.1% vs 13.4%, OR=0.73, for girls 5.5% vs 7.6%, OR=0.71) scores compared with those born to mothers in the not-in-pregnancy group. These differences were attenuated on adjustment for confounding and mediating factors. Boys and girls born to light drinkers had higher mean cognitive test scores compared with those born to mothers in the not-in-pregnancy group: for boys, naming vocabulary (58 vs 55), picture similarities (56 vs 55) and pattern construction (52 vs 50), for girls naming vocabulary (58 vs 56) and pattern construction (53 vs 52). Differences remained statistically significant for boys in naming vocabulary and picture similarities. Conclusions At age 5 years cohort members born to mothers who drank up to 1–2 drinks per week or per occasion during pregnancy were not at increased risk of clinically relevant behavioural difficulties or cognitive deficits compared with children of mothers in the not-in-pregnancy group

Health in pregnancy and post-birth:contribution to improved child outcomes

Purpose– The purpose of this paper is to describe the major factors affecting health during pregnancy, birth and the postnatal period and outline the evidence for interventions to improve outcomes in women and their children.Design/methodology/approach– Selective review of the literature. A number of electronic bibliographic databases were searched, including the Cochrane Database of Systematic Reviews, PubMed and PsycINFO, for relevant studies published since 1990. Papers were restricted to those published in English which presented data from studies conducted in high-income countries, with priority given to systematic reviews, randomised controlled trials and other quantitative studies which present a higher level of evidence.Findings– Many factors may affect maternal and infant health during and after pregnancy. Potentially modifiable factors with an evidence base to support intervention include improving diet, and the avoidance of smoking, alcohol and illicit drugs. Good clinical management of underlying illness is also important, along with attempts to engage women in improving health prior to conception and postnatally rather than once pregnancy is established.Research limitations/implications– The evidence base for interventions on some potentially modifiable risk factors is incomplete. There is good evidence of benefit from some health behaviours such as smoking cessation and uptake of breastfeeding and accumulating evidence of the benefit of some models of maternity care.Practical implications– Good maternal health during and after pregnancy plays a key role in giving the child a better start in life. Improved health behaviours are vital but often these are heavily dependent on social context and hence working to tackle social inequality and provide maternity care tailored to individual need is likely to be just as important as trying to directly alter behaviour.Originality/value– Pregnancy and the postnatal period present an opportunity to improve maternal health and have a positive effect on future child health. Greater investment is required in this antenatal period of life.</jats:sec

S4E10: Are you ready to garden?

Springtime in Maine can mean turning on the heat in the morning and the air conditioner in the afternoon. Spring also is when people flock to vegetable gardens, patios, flower beds and orchards. Gardening, which has been particularly popular during the pandemic, has a number of benefits — from reducing stress to increasing property values. In this semester’s final episode of “The Maine Question,” Charlene Gray, University of Maine lecturer in landscape in design, and Kate Garland, University of Maine Cooperative Extension horticulture professional, talk with host Ron Lisnet about all things gardening, including promoting bee populations

Teacher argumentation in the secondary science classroom : images of two modes of scientific inquiry

The purpose of this exploratory study was to examine scientific arguments constructed by secondary science teachers during instruction. The analysis focused on how arguments constructed by teachers differed based on the mode of inquiry underlying the topic. Specifically, how did the structure and content of arguments differ between experimentally and historically based topics? In addition, what factors mediate these differences? Four highly experienced high school science teachers were observed daily during instructional units for both experimental and historical science topics. Data sources include classroom observations, field notes, reflective memos, classroom artifacts, a nature of science survey, and teacher interviews. The arguments were analyzed for structure and content using Toulmin’s argumentation pattern and Walton’s schemes for presumptive reasoning revealing specific patterns of use between the two modes of inquiry. Interview data was analyzed to determine possible factors mediating these patterns. The results of this study reveal that highly experienced teachers present arguments to their students that, while simple in structure, reveal authentic images of science based on experimental and historical modes of inquiry. Structural analysis of the data revealed a common trend toward a greater amount of scientific data used to evidence knowledge claims in the historical science units. The presumptive reasoning analysis revealed that, while some presumptive reasoning schemes remained stable across the two units (e.g. ‘causal inferences’ and ‘sign’ schemes), others revealed different patterns of use including the ‘analogy’, ‘evidence to hypothesis’, ‘example’, and ‘expert opinion’ schemes. Finally, examination of the interview and survey data revealed five specific factors mediating the arguments constructed by the teachers: view of the nature of science, nature of the topic, teacher personal factors, view of students, and pedagogical decisions. These factors influenced both the structure and use of presumptive reasoning in the arguments. The results have implications for classroom practice, teacher education, and further research

Does biological relatedness affect child survival?

Objective: We studied child survival in Rakai, Uganda where many children are fostered out or orphaned. Methods: Biological relatedness is measured as the average of the Wright’s coefficients between each household member and the child. Instrumental variables for fostering include proportion of adult males in household, age and gender of household head. Control variables include SES, religion, polygyny, household size, child age, child birth size, and child HIV status. Results: Presence of both parents in the household increased the odds of survival by 28%. After controlling for the endogeneity of child placement decisions in a multivariate model we found that lower biological relatedness of a child was associated with statistically significant reductions in child survival. The effects of biological relatedness on child survival tend to be stronger for both HIV- and HIV+ children of HIV+ mothers. Conclusions: Reductions in the numbers of close relatives caring for children of HIV+ mothers reduce child survival.AIDS/HIV, child survival, fostering, orphans, Uganda

Childhood Precursors of Adult Morbidity and Mortality In Developing Countries : Implications for Health Programs

This paper will examine only one aspect of this health transition in developing countries. It will look at the emerging health problems among the adults and the aged and assess to what degree these chronic diseases and disabilities might be a consequence of infectious diseases and other adverse conditions which were experienced decades earlier in infancy and childhood. A recognition of these relationships can enhance our understanding of the cost-effectiveness and cost benefits of programs to promote child health. Child health interventions are not only cost-effective in saving lives and preventing disabilities in the short run but, more importantly, in the long run can result in major cost savings to health systems and accelerate national development by improving the health and productivity of these children when they become adults.A version of this paper was first presented at the Workshop on Policy and Planning Implications of the Epidemiological Transition In Developing Countries sponsored by The Committee on Population of the National Academy of Sciences Washington, D.C. November 20.22, 1991. Partial support for the work was provided by the U.S. Agency for International Development under Child Survival Cooperative Agreement DPE-5951-A-00-5051

Light drinking in pregnancy and mid-childhood mental health and learning outcomes

OBJECTIVE: To investigate whether light drinking in pregnancy is associated with adverse child mental health and academic outcomes. DESIGN: Using data from the prospective, population-based Avon Longitudinal Study of Parents and Children (ALSPAC), we investigated the associations between light drinking in pregnancy (<1 glass per week in the first trimester) and child mental health (using both parent and teacher rated Strengths and Difficulties Questionnaires (SDQs)) and academic outcomes based on Key Stage 2 examination results at age 11 years. PARTICIPANTS: 11-year-old children from ALSPAC with parent (n=6587) and teacher (n=6393) completed SDQs and data from Key Stage 2 examination results (n=10 558). RESULTS: 39% of women had consumed <1 glass per week and 16% ≥1 glass per week of alcohol during the first trimester (45% abstaining). After adjustment, relative to abstainers, there was no effect of light drinking on teacher-rated SDQ scores or examination results. In girls, although there was a suggestion of worse outcomes (adjusted regression coefficient=0.38; 95% CI 0.01 to 0.74) on the parent-rated total SDQ score in those exposed to light drinking compared to abstainers, no dose-response relationship was evident. CONCLUSIONS: Although the pattern of findings involving parent ratings for girls exposed to light drinking is consistent with earlier findings from this cohort, the overall lack of any adverse effects of light drinking is similar to findings from other recent cohort studies. Light drinking in pregnancy does not appear to be associated with clinically important adverse effects for mental health and academic outcomes at the age of 11 years