The First Eigenvalue of the Dirac Operator on Quaternionic Kaehler Manifolds

In a previous paper we proved a lower bound for the spectrum of the Dirac operator on quaternionic Kaehler manifolds. In the present article we show that the only manifolds in the limit case, i.e. the only manifolds where the lower bound is attained as an eigenvalue, are the quaternionic projective spaces. We use the equivalent formulation in terms of the quaternionic Killing equation and show that a nontrivial solution defines a parallel spinor on the associated hyperkaehler manifold.Comment: 19 pages, LaTeX2e, fullpage styl

Development of a shipboard damage control Fire Team Leader Intelligent Computer Aided Instructional tutoring system.

http://archive.org/details/developmentofshi00weinN

Geometric realizations of curvature models by manifolds with constant scalar curvature

We show any Riemannian curvature model can be geometrically realized by a manifold with constant scalar curvature. We also show that any pseudo-Hermitian curvature model, para-Hermitian curvature model, hyper-pseudo-Hermitian curvature model, or hyper-para-Hermitian curvature model can be realized by a manifold with constant scalar and *-scalar curvature

Climate and Solar Energy Conversion: Proceedings of a IIASA Workshop, December 8-10, 1976

The IIASA Energy Program is concerned with global aspects of energy systems in terms of resources, demands, options, strategies, and constraints. One constraint on an energy system is its potential impact on climate. The IIASA Energy and Climate Subtask, which is supported by the United Nations Environment Programme (UNEP), is studying the possible impact on global climate of the three major medium-to long-term energy options: nuclear, fossil fuel, and solar. These proceedings deal with the potential impact on global climate of large-scale solar energy conversion. The volume provides information on characteristics of solar energy conversion systems and on possible ways in which they could alter climatic boundary conditions. The information presented also forms the basis for a continuing study of the climate constraints of the solar option within the Energy and Climate Subtask, and in cooperation with other groups

Multi-operator brackets acting thrice

We generalize an identity, first found by Bremner, for the action of three nested Nambu brackets.Comment: Added references and detailed proof of main result, conforming to journal versio

Screening for Chronic Conditions Using a Patient Internet Portal: Recruitment for an Internet-based Primary Care Intervention

Background: Patient Internet portals have created new opportunities for assessment and management of chronic conditions. Objective: To conduct an online screening survey for a study recruitment using a secure patient Internet portal to identify primary care patients with untreated depression, chronic pain, or mobility difficulty before nonurgent office visits. Design: Internet-based screening survey for a randomized trial. Participants: Patients who were registered portal users who had scheduled primary care appointments. Approach: Electronic study invitations via the portal were sent to 4,047 patients with scheduled visits to 34 primary care physicians participating in the study. After clicking on a link in the study invitation, patients were consecutively shown the study description, consent form, and lastly, the screening survey to determine final eligibility for study participation. Results: Of the 2,113 (52%) patients who opened the study invitation, 1,001 consented online to join the study and 981 (98%) of these completed the screening survey. Of the respondents, 319 (33%) screened positive for 1 or more of the 3 conditions. Conclusions: The online screening survey conducted through the patient portal was effective in identifying patients with chronic conditions in advance of scheduled primary care visits for participation in an intervention study

UK science press officers, professional vision and the generation of expectations

Science press officers can play an integral role in helping promote expectations and hype about biomedical research. Using this as a starting point, this article draws on interviews with 10 UK-based science press officers, which explored how they view their role as science reporters and as generators of expectations. Using Goodwin’s notion of ‘professional vision’, we argue that science press officers have a specific professional vision that shapes how they produce biomedical press releases, engage in promotion of biomedical research and make sense of hype. We discuss how these insights can contribute to the sociology of expectations, as well as inform responsible science communication.This project was funded by the Wellcome Trust (Wellcome Trust Biomedical Strategic Award 086034)