55 research outputs found
Spaceport Command and Control System: Network Engineering
The Spaceport Command and Control System (SCCS) project's goal is to facilitate the checkout and launch of NASA's next generation SLS vehicle in order to enable human exploration through deep space. SCCS is made up of complex software that will control and monitor the Space Launch System rocket and Orion spacecraft. Once it is fully developed, SCCS will be a large improvement to previous software since it takes advantage of modern computers and information making it faster and more reliable than the software used previously on the Shuttle program. The software will be tailored to the specific needs of the Space Launch System (SLS) and Orion spacecraft. These three projects will be brought together for the launch of Exploration Mission-1
A consistent analysis of (e,e'p) and (d,3He) experiments
The apparent discrepancy between spectroscopic factors obtained in (e,e'p)
and (d,3He) experiments is investigated. This is performed first for
48Ca(e,e'p) and 48Ca(d,3He) experiments and then for other nuclei. It is shown
that the discrepancy disappears if the (d,3He) experiments are re-analyzed with
a non-local finite range DWBA analysis with a bound-state wave function that is
obtained from (e,e'p) experiments.Comment: 23 pages, 7 figure
Tunable magnetic exchange interactions in manganese-doped inverted core/shell ZnSe/CdSe nanocrystals
Magnetic doping of semiconductor nanostructures is actively pursued for
applications in magnetic memory and spin-based electronics. Central to these
efforts is a drive to control the interaction strength between carriers
(electrons and holes) and the embedded magnetic atoms. In this respect,
colloidal nanocrystal heterostructures provide great flexibility via
growth-controlled `engineering' of electron and hole wavefunctions within
individual nanocrystals. Here we demonstrate a widely tunable magnetic sp-d
exchange interaction between electron-hole excitations (excitons) and
paramagnetic manganese ions using `inverted' core-shell nanocrystals composed
of Mn-doped ZnSe cores overcoated with undoped shells of narrower-gap CdSe.
Magnetic circular dichroism studies reveal giant Zeeman spin splittings of the
band-edge exciton that, surprisingly, are tunable in both magnitude and sign.
Effective exciton g-factors are controllably tuned from -200 to +30 solely by
increasing the CdSe shell thickness, demonstrating that strong quantum
confinement and wavefunction engineering in heterostructured nanocrystal
materials can be utilized to manipulate carrier-Mn wavefunction overlap and the
sp-d exchange parameters themselves.Comment: To appear in Nature Materials; 18 pages, 4 figures + Supp. Inf
Charged-Particle Thermonuclear Reaction Rates: III. Nuclear Physics Input
The nuclear physics input used to compute the Monte Carlo reaction rates and
probability density functions that are tabulated in the second paper of this
series (Paper II) is presented. Specifically, we publish the input files to the
Monte Carlo reaction rate code RatesMC, which is based on the formalism
presented in the first paper of this series (Paper I). This data base contains
overwhelmingly experimental nuclear physics information. The survey of
literature for this review was concluded in November 2009.Comment: 132 page
Mentorship: The New Master-Apprentice Model in Higher Education
Renewing our understanding of the relationship between teaching and mentoring can advance our practice as educators and improve student outcomes. As we strengthen connections between the classroom and the workplace, we contextualize students’ learning and provide the tools for success both academically and professionally. This article provides a historical and theoretical foundation for mentoring in higher education, accompanied by concrete strategies and suggestions for implementing a mentoring program and encouraging individual faculty members to expand their pedagogical practice by engaging in mentoring through their daily interactions with students
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