4,914 research outputs found
A heuristic exploration into the lived experience of trying to “have it all” at 30: How do professional women experience desiring to mother and career planning against the backdrop of the finitude of their fertility?
A time of heightened anxiety arises for women who have careers and wish to be mothers around the age of 30. It seems that for this group of women, the experience of choosing when to become mothers is imbued with anxiety rich with existential themes such as, choice, freedom, meaning, temporality, mortality and finitude. In this heuristic pilot study, the author reflects on their own experience of this choice alongside another woman’s in a similar situation as an investigation into the lived experience of the phenomenon, The study concludes with a depiction of the lived experience of a woman with a career trying to “have-it-all”. The research found that the experienced anxiety could broadly be divided across the existential themes of; uncertainty, meaning and temporality, and furthermore across the 4 existential worlds. Further research could open up the experience of women in a broad range of scenarios who are negotiating the decision to mother and gain deeper understanding into the factors that impact the experience
An analogue of the Magnus problem for associative algebras
We prove an analogue of the Magnus theorem for associative algebras without
unity over arbitrary fields. Namely, if an algebra is given by n+k generators
and k relations and has an n-element system of generators, then this algebra is
a free algebra of rank n
On UV/IR Mixing via Seiberg-Witten Map for Noncommutative QED
We consider quantum electrodynamics in noncommutative spacetime by deriving a
-exact Seiberg-Witten map with fermions in the fundamental
representation of the gauge group as an expansion in the coupling constant.
Accordingly, we demonstrate the persistence of UV/IR mixing in noncommutative
QED with charged fermions via Seiberg-Witten map, extending the results of
Schupp and You [1].Comment: 16 page
Resistivity scaling and electron relaxation times in metallic nanowires
We study the resistivity scaling in nanometer-sized metallic wires due to
surface roughness and grain-boundaries, currently the main cause of electron
scattering in nanoscaled interconnects. The resistivity has been obtained with
the Boltzmann transport equation, adopting the relaxation time approximation
(RTA) of the distribution function and the effective mass approximation for the
conducting electrons. The relaxation times are calculated exactly, using
Fermi's golden rule, resulting in a correct relaxation time for every sub-band
state contributing to the transport. In general, the relaxation time strongly
depends on the sub-band state, something that remained unclear with the methods
of previous work. The resistivity scaling is obtained for different roughness
and grain-boundary properties, showing large differences in scaling behavior
and relaxation times. Our model clearly indicates that the resistivity is
dominated by grain-boundary scattering, easily surpassing the surface roughness
contribution by a factor of 10.Comment: 19 pages, 5 figure
Pairwise Well-Formed Modes and Transformations
One of the most significant attitudinal shifts in the history of music
occurred in the Renaissance, when an emerging triadic consciousness moved
musicians towards a new scalar formation that placed major thirds on a par with
perfect fifths. In this paper we revisit the confrontation between the two
idealized scalar and modal conceptions, that of the ancient and medieval world
and that of the early modern world, associated especially with Zarlino. We do
this at an abstract level, in the language of algebraic combinatorics on words.
In scale theory the juxtaposition is between well-formed and pairwise
well-formed scales and modes, expressed in terms of Christoffel words or
standard words and their conjugates, and the special Sturmian morphisms that
generate them. Pairwise well-formed scales are encoded by words over a
three-letter alphabet, and in our generalization we introduce special positive
automorphisms of , the free group over three letters.Comment: 12 pages, 3 figures, paper presented at the MCM2017 at UNAM in Mexico
City on June 27, 2017, keywords: pairwise well-formed scales and modes,
well-formed scales and modes, well-formed words, Christoffel words, standard
words, central words, algebraic combinatorics on words, special Sturmian
morphism
The explicit expression of the fugacity for weakly interacting Bose and Fermi gases
In this paper, we calculate the explicit expression for the fugacity for two-
and three-dimensional weakly interacting Bose and Fermi gases from their
equations of state in isochoric and isobaric processes, respectively, based on
the mathematical result of the boundary problem of analytic functions --- the
homogeneous Riemann-Hilbert problem. We also discuss the Bose-Einstein
condensation phase transition of three-dimensional hard-sphere Bose gases.Comment: 24 pages, 9 figure
Early Science with the Karoo Array Telescope: a Mini-Halo Candidate in Galaxy Cluster Abell 3667
Abell 3667 is among the most well-studied galaxy clusters in the Southern
Hemisphere. It is known to host two giant radio relics and a head-tail radio
galaxy as the brightest cluster galaxy. Recent work has suggested the
additional presence of a bridge of diffuse synchrotron emission connecting the
North-Western radio relic with the cluster centre. In this work, we present
full-polarization observations of Abell 3667 conducted with the Karoo Array
Telescope at 1.33 and 1.82 GHz. Our results show both radio relics as well as
the brightest cluster galaxy. We use ancillary higher-resolution data to
subtract the emission from this galaxy, revealing a localised excess, which we
tentatively identify as a radio mini-halo. This mini-halo candidate has an
integrated flux density of mJy beam at 1.37 GHz,
corresponding to a radio power of P
W Hz, consistent with established trends in mini-halo power scaling.Comment: 17 pages, 10 figures, accepted MNRA
Topological interface engineering and defect crossing in ultracold atomic gases
We propose an experimentally feasible scheme for topological interface
engineering and show how it can be used for studies of dynamics of
topologically nontrivial interfaces and perforation of defects and textures
across such interfaces. The method makes use of the internal spin structure of
the atoms together with locally applied control of interaction strengths to
create many-particle states with highly complex topological properties. In
particular, we consider a constructed coherent interface between topologically
distinct phases of spinor Bose-Einstein condensates.Comment: 9 pages, 7 figure
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