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Responsible Conduct: The Ethics of It All in Life and Research

The teaching and learning of ethics as applied generally to the human condition as well as specifically to ethics in research are explored in this discourse. This first section focuses on individual moral dilemmas whereas the second depicts professional ethics in a more complicated tension between the personal moral self and the professional rules, regulations, and ethical expectations of a particular institution

Use of Coherent Transition Radiation to Set Up the APS RF Thermionic Gun to Produce High-Brightness Beams for SASE FEL Experiments

We describe use of the Advanced Photon Source (APS) rf thermionic gun, alpha magnet beamline, and linac to produce a stable high-brightness beam in excess of 100 amperes peak current with normalized emittance of 10 pi mm-mrad. To obtain peak currents greater than 100 amperes, the rf gun system must be tuned to produce a FWHM bunch length on the order of 350 fs. Bunch lengths this short are measured using coherent transition radiation (CTR) produced when the rf gun beam, accelerated to 40 MeV, strikes a metal foil. The CTR is detected using a Golay detector attached to one arm of a Michelson interferometer. The alpha magnet current and gun rf phase are adjusted so as to maximize the CTR signal at the Golay detector, which corresponds to the minimum bunch length. The interferometer is used to measure the autocorrelation of the CTR radiation. The minimum phase approximation is used to derive the bunch profile from the autocorrelation. The high-brightness beam is accelerated to 217 MeV and used to produce SASE in five APS undulators installed in the Low- Energy Undulator Test Line (LEUTL) experiment hall. Initial optical measurements showed a gain length of 1.3 m at 530 nm. * Work supported by U. S. Department of Energy, Office of Basic Energy Sciences, under Contract No. W-31-109-ENG-38.Comment: LINAC2000 MOB17 3 pages 8 figure

Imaging Techniques for Relativistic Beams: Issues and Limitations

Characterizations of transverse profiles for low-power beams in the accelerators of the proposed linear colliders (ILC and CLIC) using imaging techniques are being evaluated. Assessments of the issues and limitations for imaging relativistic beams with intercepting scintillator or optical transition radiation screens are presented based on low-energy tests at the Fermilab A0 photoinjector and are planned for the Advanced Superconducting Test Accelerator at Fermilab.Comment: 8 pages, 11 Figures, LCWS1

Ethical Leadership in Intercollegiate Athletics

Ethical leadership and a values-based culture should be two sides of the same coin in intercollegiate athletics. Needed are ethical leaders serving as role models of integrity, trustworthiness, honesty, fairness, and respect for others. Ethical leaders model how values should guide actions and decisions as well as implement reward systems that hold others accountable for ethical conduct. Athletic directors and other athletic administrators with the moral courage to do what is right regardless of circumstances can nurture values-based cultures as they shape and develop the lives of athletes and colleagues they influence. The purposes of this theoretical work are to explicate ethical leadership, explain the connection between ethical leadership and a values-based culture, and propose a model for developing and sustaining ethical leadership in a values-based culture

Inertia-induced accumulation of flotsam in the subtropical gyres

Recent surveys of marine plastic debris density have revealed high levels in the center of the subtropical gyres. Earlier studies have argued that the formation of great garbage patches is due to Ekman convergence in such regions. In this work we report a tendency so far overlooked of drogued and undrogued drifters to accumulate distinctly over the subtropical gyres, with undrogued drifters accumulating in the same areas where plastic debris accumulate. We show that the observed accumulation is too fast for Ekman convergence to explain it. We demonstrate that the accumulation is controlled by finite-size and buoyancy (i.e., inertial) effects on undrogued drifter motion subjected to ocean current and wind drags. We infer that the motion of flotsam in general is constrained by similar effects. This is done by using a newly proposed Maxey--Riley equation which models the submerged (surfaced) drifter portion as a sphere of the fractional volume that is submerged (surfaced).Comment: Submitted to Geophys. Res. Letter