Micromechanics of composite laminate compression failure

The Dugdale analysis for metals loaded in tension was adapted to model the failure of notched composite laminates loaded in compression. Compression testing details, MTS alignment verification, and equipment needs were resolved. Thus far, only 2 ductile material systems, HST7 and F155, were selected for study. A Wild M8 Zoom Stereomicroscope and necessary attachments for video taping and 35 mm pictures were purchased. Currently, this compression test system is fully operational. A specimen is loaded in compression, and load vs shear-crippling zone size is monitored and recorded. Data from initial compression tests indicate that the Dugdale model does not accurately predict the load vs damage zone size relationship of notched composite specimens loaded in compression

A quantitative analysis of the production, selection, and career paths of Texas public school administrators

Using state-wide, longitudinal data on Texas public school educators employed between the 1991-1991 and 2010-2011 school years, this study explores the disproportionate selection of campus leaders based on ethnicity and gender. Through a combination of descriptive and inferential techniques, this study illustrates how trends in the production, selection, and career paths of administratively-certified educators at the various intersections of ethnicity and gender have changed over time. Controlling for a variety of individual work history and campus characteristics, this study also explores how an administratively-certified educator’s ethnicity and gender affect their probability of procuring a campus leadership position.Educational Administratio

Irish women in the diaspora: exclusions and inclusions

Irish women have a long history of emigration which provides parallels with the experiences of women now moving to settle in Ireland. In both cases, women migrants have been needed to fill the massive deficit of paid domestic labor in rapidly industrialising economies. Over the last two centuries, these destinations for Irish women have included the USA, Britain and Australia, as well as Canada, New Zealand, South Africa and Argentina. Some of the complexities in the positioning of migrant Irish women within the “diaspora spaces” they occupy are explored in this article. I identify ongoing disadvantage for certain groups of Irish-born women, drawing on evidence primarily from Britain, which has the largest contemporary diasporic Irish population. Comparisons are made with Irish women's experiences in the USA and Australia, using Census and survey data generated by and for the 2002 Task Force on Policy regarding Emigrants. The concept of diaspora explicitly includes those identifying themselves as Irish over several generations. I use qualitative findings from the Irish 2 Project, a recent study of the large second-generation Irish population in Britain, to examine narratives of women living in Manchester who grew up in “Irish” households and are subsequently negotiating hybrid identities in adulthood. These offer insights into longitudinal dimensions of migrant experience and the continuing significance of ethnic difference

Letters between Walter H. Bradley and William Kerr\u27s secretary

Letters concerning a position in the modern languages department at Utah Agricultural College

Micromechanics of compression failures in open hole composite laminates

The high strength-to-weight ratio of composite materials is ideally suited for aerospace applications where they already are used in commercial and military aircraft secondary structures and will soon be used for heavily loaded primary structures. One area impeding the widespread application of composites is their inherent weakness in compressive strength when compared to the tensile properties of the same material. Furthermore, these airframe designs typically contain many bolted or riveted joints, as well as electrical and hydraulic control lines. These applications produce areas of stress concentration, and thus, further complicate the compression failure problem. Open hole compression failures which represent a typical failure mode for composite materials are addressed

Health care professionals' preferences for extending mammographic breast screening to the over 70s

Background Breast screening improves survival in women aged 50–70. The relative benefits of screening in women over 70 are reduced but women up to age 80 may still benefit. In the UK the National Health Service provides screening by self referral to women >70. This research has investigated health care professionals' (HCPs') preferences for extending screening to older women and factors they consider when advising about screening. Materials and methods UK HCPs for breast or elderly care were recruited. A questionnaire relating to screening in the >70s was administered. A sample of respondents were also interviewed to give added insight. Results Questionnaires were distributed to 488 HCPs and 139 replies received, (29%). A total of 26 professionals were also interviewed. Most felt the current system of self referral was under-utilized due to poor user awareness. Predicted life expectancy, co-morbidity and patient preference were viewed as important factors influencing screening recommendation. Chronological age was thought less important. The present system was thought flawed, but there was little enthusiasm for extending screening due to perceived risks and reduced cost efficacy. Some form of selectivity for fitter women was advocated. Conclusions There was acceptance that fitter older women may benefit from screening whilst the less fit may be harmed suggesting that some form of selective invitation would be preferable to the present system but would be practically difficult and costly to administer. The present system of self referral was felt to be inadequate due to low levels of awareness and uptake