A High-Speed Detector System for X-ray Fluorescence Microprobes.

We have developed a high-speed system for collecting x-ray fluorescence microprobe data, based on ASICs developed at BNL and high-speed processors developed by CSIRO. The system can collect fluorescence data in a continuous raster scan mode, and present elemental images in real time using Ryan's Dynamic Analysis algorithm. We will present results from a 32-element prototype array illustrating the concept. The final instrument will have 384 elements arranged in a square array around a central hole

An argument for the use of Aristotelian method in bioethics

The main claim of this paper is that the method outlined and used in Aristotle's Ethics is an appropriate and credible one to use in bioethics. Here “appropriate” means that the method is capable of establishing claims and developing concepts in bioethics and “credible” that the method has some plausibility, it is not open to obvious and immediate objection. It begins by suggesting why this claim matters and then gives a brief outline of Aristotle's method. The main argument is made in three stages. First, it is argued that Aristotelian method is credible because it compares favourably with alternatives. In this section it is shown that Aristotelian method is not vulnerable to criticisms that are made both of methods that give a primary place to moral theory (such as utilitarianism) and those that eschew moral theory (such as casuistry and social science approaches). As such, it compares favourably with these other approaches that are vulnerable to at least some of these criticisms. Second, the appropriateness of Aristotelian method is indicated through outlining how it would deal with a particular case. Finally, it is argued that the success of Aristotle's philosophy is suggestive of both the credibility and appropriateness of his method.</p

Supporting DACA recipients and international students pursuing careers in medicine: A pilot program for advisors

The United States (U.S.) health professions are becoming more invested in diversity. Information on students who are undocumented or recipients of Deferred Action for Childhood Arrivals (DACA), and international students on student visas entering U.S. medical education is sparse. Few programs offer targeted training for educators on advising students who are undocumented, DACA recipients, or on a visa. We piloted a virtual program for prehealth advisors and educators on supporting students who are undocumented or recipients of DACA and international students transitioning to medical school. Program evaluation consisted of an anonymous retrospective pre-post survey. Of 117 registrants, 40% completed the survey. Prior to the program, most participants indicated that they were unsure or thought students were ineligible for financial aid during medical school if they were DACA recipients (40% unsure, 26.6% ineligible) or on a student visa (30% unsure, 30% ineligible). After the program, most respondents reported students were eligible for merit scholarship or private loans with DACA (66.6% eligible) or an international student visa (60% eligible). Perceptions of students with DACA being able to lawfully practice medicine in the U.S. changed from pre-program (43.3% unsure or not eligible) to post-program (90% eligible). Participants indicated they were more confident advising DACA recipients and international students post program. This virtual program was an effective step in providing support for advisors who are assisting non-citizen or permanent resident students start their careers in healthcare. Our findings show the need for more information on advising students who are DACA recipients, undocumented, or on student visas prior to matriculating to medical school and throughout training

A coded aperture microscope for X-ray fluorescence full-field imaging

The design and construction of an instrument for full-field imaging of the X-ray fluorescence emitted by a fully illuminated sample are presented. The aim is to produce an X-ray microscope with a few micrometers spatial resolution, which does not need to scan the sample. Since the fluorescence from a spatially inhomogeneous sample may contain many fluorescence lines, the optic which will provide the magnification of the emissions must be achromatic, i.e. its optical properties must be energy-independent. The only optics which fulfill this requirement in the X-ray regime are mirrors and pinholes. The throughput of a simple pinhole is very low, so the concept of coded apertures is an attractive extension which improves the throughput by having many pinholes, and retains the achromatic property. Modified uniformly redundant arrays (MURAs) with 10 mu m openings and 50% open area have been fabricated using gold in a lithographic technique, fabricated on a 1 mu m-thick silicon nitride membrane. The gold is 25 mu m thick, offering good contrast up to 20keV. The silicon nitride is transparent down into the soft X-ray region. MURAs with various orders, from 19 up to 73, as well as their respective negative (a mask where open and closed positions are inversed compared with the original mask), have been made. Having both signs of mask will reduce near-field artifacts and make it possible to correct for any lack of contrast

Measurements, Models, Systems and Design

531 s.

Why Moral Expertise Needs Moral Theory

Discussions of the nature or possibility of moral expertise have largely proceeded in atheoretical terms, with little attention paid to whether moral expertise depends on theoretical knowledge of morality. Here I argue that moral expertise is more theory-dependent than is commonly recognized: Moral expertise consists, at least in part, in knowledge of the correct or best moral theory, and second, that knowledge of moral theory is essential to moral experts dispensing expert counsel to non-experts. Moral experts would not be moral experts absent knowledge of moral theory, nor could they play the testimonial role we would expect them to play in moral inquiry and deliberation absent such knowledg