4,722 research outputs found
The Roles of a Consultant in a Cooperative System Headquarters
published or submitted for publicatio
Band engineering in dilute nitride and bismide semiconductor lasers
Highly mismatched semiconductor alloys such as GaNAs and GaBiAs have several
novel electronic properties, including a rapid reduction in energy gap with
increasing x and also, for GaBiAs, a strong increase in spin orbit- splitting
energy with increasing Bi composition. We review here the electronic structure
of such alloys and their consequences for ideal lasers. We then describe the
substantial progress made in the demonstration of actual GaInNAs telecomm
lasers. These have characteristics comparable to conventional InP-based
devices. This includes a strong Auger contribution to the threshold current. We
show, however, that the large spin-orbit-splitting energy in GaBiAs and GaBiNAs
could lead to the suppression of the dominant Auger recombination loss
mechanism, finally opening the route to efficient temperature-stable telecomm
and longer wavelength lasers with significantly reduced power consumption.Comment: 27 pages, 11 figure
Waiting to exhale: Somatic responses to place and the genocidal sublime
This paper examines various theories of trauma and representation to critically reflect upon the production of a digital diptych installation designed to reward stillness and contemplation. The exegesis considers various artistic strategies including eye-witness testimony, silence, place, ethnographic documentary and poeisis
Theory and design of InGaAsBi mid-infrared semiconductor lasers: type-I quantum wells for emission beyond 3 m on InP substrates
We present a theoretical analysis and optimisation of the properties and
performance of mid-infrared semiconductor lasers based on the dilute bismide
alloy InGaAsBi, grown on conventional (001) InP
substrates. The ability to independently vary the epitaxial strain and emission
wavelength in this quaternary alloy provides significant scope for band
structure engineering. Our calculations demonstrate that structures based on
compressively strained InGaAsBi quantum wells (QWs)
can readily achieve emission wavelengths in the 3 -- 5 m range, and that
these QWs have large type-I band offsets. As such, these structures have the
potential to overcome a number of limitations commonly associated with this
application-rich but technologically challenging wavelength range. By
considering structures having (i) fixed QW thickness and variable strain, and
(ii) fixed strain and variable QW thickness, we quantify key trends in the
properties and performance as functions of the alloy composition, structural
properties, and emission wavelength, and on this basis identify routes towards
the realisation of optimised devices for practical applications. Our analysis
suggests that simple laser structures -- incorporating
InGaAsBi QWs and unstrained ternary
InGaAs barriers -- which are compatible with established
epitaxial growth, provide a route to realising InP-based mid-infrared diode
lasers.Comment: Submitted versio
Areal Geology of the Post-Paleozoic Surface of the Northwest Plains
Probably most of the area included in this report has been examined to some extent by oil geologists, and most, if not all, of the important domes have been discovered and surveyed thoroughly. In parts of the area, the bedrock is covered by glacial drift or alluvium material, but it is reasonable to believe that no new domal structure will be found. This means that surface examination alone will be insufficient in locating new oil fields, so future prospecting will be dependent, to a great extent, on studies of sub-surface stratigraphy
Warner Bros. v. Nelson: A Prelude to the De Havilland Law
In 1944, the California Court of Appeals handed down its landmark decision in De Haviland v. Warner Bros ending the practice of studios extending personal service contracts beyond the statutory limit of seven years by adding suspension periods incurred during the contract term. “Suspension/extension” could double the term of an actor’s contract. The De Haviland case has justly received much attention, but an earlier case, Warner Bros. v. Nelson, in which Bette Davis also challenged the practice of suspension/extension, merits more attention than it has received.
In Warner Bros. Nelson, Davis argued that her studio contract should not be enforced on several grounds including that the suspension/extension clauses were inequitable. During the trial, the studio waived its powerful rights to suspension/extension for reasons previously unknown. Not until now has that waiver been properly contextualized with the help of archival research of studio records. Furthermore, archival research has uncovered that the studio explored revising and limiting its power of suspension/extension as a result of Davis’s arguments.
This Article reveals that Davis achieved much more than was previously understood. It discusses how these cases, in particular De Haviland, still resonate today in the sports and entertainment industries. It also suggests that the recent dispute between the Writers Guild of America and the Association of Talent Agents can be viewed as a consequence of these cases
From Theory to Practice: Creating a Toolkit for Engaged Design
Researchers and designers alike have called for more inclusive and participatory approaches to be used within design. By first exploring the work of researchers designing with older adults living with dementia and expanding to a more robust literature review surrounding inclusion in design, I found that the literature not only suggests that design could benefit from an integration of interdisciplinary knowledge, critical reflection of methods and intentional interaction with users, but also presents theories for doing so. This project condenses four of those theories into key principles, and uses them to present a framework of Engaged Design, a mindset intended to helps designers prioritize critical reflection of their processes in order to interact more meaningfully with their users.Master of ScienceInformation, School ofUniversity of Michiganhttp://deepblue.lib.umich.edu/bitstream/2027.42/162557/1/Broderick_Brianna_Final_MTOP_Thesis_20200501.pd
Effects of Strong Magnetic Fields in Strange Baryonic Matter
We investigate the effects of very strong magnetic fields upon the equation
of state of dense bayonic matter in which hyperons are present. In the presence
of a magnetic field, the equation of state above nuclear density is
significantly affected both by Landau quantization and magnetic moment
interactions, but only for field strengths G. The former
tends to soften the EOS and increase proton and lepton abundances, while the
latter produces an overall stiffening of the EOS. Each results in a supression
of hyperons relative to the field-free case. The structure of a neutron star
is, however, primarily determined by the magnetic field stress. We utilize
existing general relativistic magneto-hydrostatic calculations to demonstrate
that maximum average fields within a stable neutron are limited to values G. This is not large enough to significantly influence
particle compositions or the matter pressure, unless fluctuations dominate the
average field strengths in the interior or configurations with significantly
larger field gradients are considered.Comment: 12 pages, 3 figures. To be submitted to Phys. Lett.
- …