A Case Study of the Efficacy of Model-Based Requests for Information

The Department of Defense (DoD) has encouraged the transition to digital engineering, yet there are limited guides for how to transition and there is limited data to show where an organization like a program office can reap the most benefit from the transition. To identify areas where potential benefits may be realized, this thesis compares two Requests for Information (RFIs), one document-based and one model-based, from generation to response. A survey was developed and administered to 7 members of a single program office to grade the RFI responses. The survey was based on the 43 benefit categories identified in the Systems Engineering Research Center’s (SERC) previous study titled, “Benchmarking the Benefits and Current Maturity of Model-Based Systems Engineering across the Enterprise.” The study identified that model-based RFIs: 1) captured 100% more requirements, 2) doubled total RFI responses, 3) increased model-based RFI responses by 64%, 4) improved RFI responses across Quality, Velocity/Agility, User Engagement, and Knowledge Transfer, 5) increased responses that were pursued by 21%. Utilizing model-based RFIs is a simple first step for program offices to take on the transition to digital engineering, not only will it uncover overlooked requirements it will help improve responses allowing pursuit of better products

O economista agrícola numa unidade de pesquisa e o alcance social de novas tecnologias.

bitstream/item/104674/1/Economista-agricola-numa-unidade.pd

Fano resonances in plasmonic core-shell particles and the Purcell effect

Despite a long history, light scattering by particles with size comparable with the light wavelength still unveils surprising optical phenomena, and many of them are related to the Fano effect. Originally described in the context of atomic physics, the Fano resonance in light scattering arises from the interference between a narrow subradiant mode and a spectrally broad radiation line. Here, we present an overview of Fano resonances in coated spherical scatterers within the framework of the Lorenz-Mie theory. We briefly introduce the concept of conventional and unconventional Fano resonances in light scattering. These resonances are associated with the interference between electromagnetic modes excited in the particle with different or the same multipole moment, respectively. In addition, we investigate the modification of the spontaneous-emission rate of an optical emitter at the presence of a plasmonic nanoshell. This modification of decay rate due to electromagnetic environment is referred to as the Purcell effect. We analytically show that the Purcell factor related to a dipole emitter oriented orthogonal or tangential to the spherical surface can exhibit Fano or Lorentzian line shapes in the near field, respectively.Comment: 28 pages, 10 figures; invited book chapter to appear in "Fano Resonances in Optics and Microwaves: Physics and Application", Springer Series in Optical Sciences (2018), edited by E. O. Kamenetskii, A. Sadreev, and A. Miroshnichenk