Scale invariant thermodynamics of a toroidally trapped Bose gas

We consider a system of bosonic atoms in an axially symmetric harmonic trap augmented with a two dimensional repulsive Gaussian optical potential. We find an expression for the grand free energy of the system for configurations ranging from the harmonic trap to the toroidal regime. For large tori we identify an accessible regime where the ideal gas thermodynamics of the system are found to be independent of toroidal radius. This property is a consequence of an invariant extensive volume of the system that we identify analytically in the regime where the toroidal potential is radially harmonic. In considering corrections to the scale invariant transition temperature, we find that the first order interaction shift is the dominant effect in the thermodynamic limit, and is also scale invariant. We also consider adiabatic loading from the harmonic to toroidal trap configuration, which we show to have only a small effect on the condensate fraction of the ideal gas, indicating that loading into the scale invariant regime may be experimentally practical.Comment: 10 pages, 3 figures, to appear in Phys. Rev. A, typos corrected, references added, rewritten to emphasize generalized volume. Results unchange

Fluid Tasks and Fluid Teams: The Impact of Diversity in Experience and Team Familiarity on Team Performance

In this paper, we consider how the structures of tasks and teams interact to affect team performance. We study the effects of diversity in experience on a team's ability to respond to task changes, by separately examining interpersonal team diversity (i.e., differences in experience across the entire team) and intrapersonal team diversity (i.e., whether individuals on the team are more or less specialized). We also examine whether team familiarity - team members' prior experience working with one another - helps teams to better manage challenges created by task changes and greater interpersonal team diversity. Using detailed project- and individual-level data from an Indian software services firm, we find that the interaction of task-change with intrapersonal diversity is related to improved project performance, while the interaction of task-change with interpersonal diversity is related to diminished performance. Additionally, the interaction of team familiarity with interpersonal diversity is related to improved project performance in some cases. Our results highlight a need for more nuanced approaches to leveraging experience in team management.Diversity, Knowledge Work, Project Flexibility, Task Change, Team Familiarity

Publications of the planetary biology program for 1976: A special bibliography

An annual listing of current publications resulting from research pursued under the auspices of NASA's Planetary Biology Program is presented. To stimulate the exchange of information and ideas among scientists working in the different areas of the program. To facilitate the exchange process. The author of each publication who is presently participating in the program is identified by asterisk. Current addresses for all principal investigators are given in the appendix

Instabilities and soot formation in spherically expanding, high pressure, rich, iso-octane-air flames

Flame instabilities, cellular structures and soot formed in high pressure, rich, spherically expanding iso-octane-air flames have been studied experimentally using high speed Schlieren cinematography, OH fluorescence, Mie scattering and laser induced incandescence. Cellular structures with two wavelength ranges developed on the flame surface. The larger wavelength cellular structure was produced by the Landau-Darrieus hydrodynamic instability, while the short wavelength cellular structure was produced by the thermal-diffusive instability. Large negative curvature in the short wavelength cusps caused local flame quenching and fracture of the flame surface. In rich flames with equivalence ratio φ > 1.8, soot was formed in a honeycomb-like structure behind flame cracks associated with the large wavelength cellular structure induced by the hydrodynamic instability. The formation of soot precursors through low temperature pyrolysis was suggested as a suitable mechanism for the initiation of soot formation behind the large wavelength flame cracks

Variation in Experience and Team Familiarity: Addressing the Knowledge Acquisition-Application Problem

Prior work in organizational learning has failed to find a consistent effect of variation in experience on performance. While some studies find a positive relationship between these two variables, others find no effect or even a negative relationship. In this paper, we suggest that the differences in prior findings may be due to the failure to separate the processes of knowledge acquisition and knowledge application. While variation in experience may permit the acquisition of valuable knowledge, additional mechanisms may be necessary to enable the subsequent application of that knowledge in a team setting. We hypothesize that team familiarity - prior experience working with team members - may be such a mechanism. We use detailed project- and individual-level data from an Indian software services firm to examine the effects of team familiarity and variation in market experience on multiple measures of performance for over 1,100 software development projects Consistent with prior work, we find mixed results for the effect of variation in experience on performance. We do, however, see evidence of a moderating effect of team familiarity on the relationship between these two variables. Our paper identifies one mechanism for uniting knowledge acquisition and knowledge application and provides insight into how the management of experience accumulation affects the development of organizational capabilities.Experience, Knowledge, Software, Team Familiarity, Variation

Redefining Roles, Responsibilities, and Authority of School Leaders

Addresses the core challenges faced by principals and other school leaders faced with high expectations and accountability and inconsistent or limited support, based on current research literature in the field