Poly(aryl ethers) and related polysiloxane copolymer molecular coatings: Preparation and radiation degradation

The radiation degradation of poly(arylene ether sulfones) and related materials is studied. These basic studies are important both as a means to developing stronger, more stable matrix resins for composite materials, as well as to improve the data base in regard to chemical structure-physical property relationships. Thirty homo and copolymers were synthesized, at least partially characterized and, in several cases suitable film casting techniques were developed. Four samples were chosen for initial radiation degradation. Poly(dimethyl siloxane) soft bocks/segments can preferentially migrate to the surface of copolymer films. Since siloxanes are utilized as thermal control coatings, this form of 'molecular' coating is of interest. The chemistry for preparing such copolymers with any of the polymers described was demonstrated

Fission fragment mass reconstruction from Si surface barrier detector measurement

A method for plasma delay and pulse-height defect corrections for Si surface barrier detectors (SBD) is presented. Based on known empirical formulae, simple approximations involving the measured time-of-flight (TOF) and energy of the ions were found and a mass reconstruction procedure was developed. The procedure was applied for obtaining the fission fragment mass and angular distributions from the $^{64}$ Ni+$^{197}$Au reaction at 418 MeV and 383 MeV incident energy using an array of eight SBDs.Comment: 3 pages, 1 table, 3 figures, submitted to NIM A ; 4 pages, 1 table, 5 figures, added discussion and figure

Do steering committees and boards constitute good project governance?

One could argue that good project governance positively influences productivity, and that this shapes the economy in a sustainable way. However, there is a prevailing perception in the corporate and government environment that steering committees and boards in some way constitutes good project governance. This perception appears to be based in part upon the presumption that the corporate sector always performs better than government; the corporate sector assures good corporate governance through boards; Ergo everyone else, including government, would perform better if they did the same. The paper argues that this presumption is indefensible as there is no scientific or rational basis to support it. Moreover, the concept of governance as steering committees and boards can diffuse responsibility and accountability in the hierarchical structures of government departments and large organisations that initiate their own projects and this can lead to project delay, confusion and uncertainty. The paper reviews the literature on governance and project steering committees and concludes that establishing project advisory rather than steering committees removes the potential for organisational power play and provides an effective consultation mechanism that facilitates 'best for project' outcomes

Patient Satisfaction and Ultrasound Use During Pregnancy

Use, number, and frequency of ultrasounds women receive during pregnancy vary widely in practice. Current evidence suggests that women presenting with pregnancy complications benefit from additional ultrasounds, although excessive ultrasound use in low risk pregnancies may be unnecessary, costly and potentially harmful. However, evidence also finds that the use of ultrasound technology is associated with mothers’ feelings of security and satisfaction with care; health care organizations are incentivized to promote these feelings of patient satisfaction, especially when clinical risk is considered low. Here, we examine the impact of ultrasound use on satisfaction during pregnancy among women in the Northeast who have recently given birth through an online retrospective survey. Contrary to expectations, findings suggest that ultrasound use is not a significant driver of satisfaction with pregnancyrelated care. Efforts to enhance patient satisfaction during pregnancy using ultrasounds may increase resource use and cost, but do little to enhance patient experience overal

The Anatomy of an Entrepreneur: Are Successful Women Entrepreneurs Different From Men?

Compares characteristics of successful entrepreneurs by gender, including education, motives for becoming entrepreneurs, views on the role of prior experience, the importance of human and social capital, sources of financial capital, and challenges