11,374 research outputs found
Domains of perfectionism: Prevalence and relationships with perfectionism, age, gender, and satisfaction with life
Perfectionists have been described as people who want to be perfect in all domains of their lives. Few studies to date, however, have investigated what domains people are perfectionistic in. Using two samples (109 university students, 289 Internet users), the present study investigated how being perfectionistic in 22 domains of life was related to perfectionism, age, gender, and satisfaction with life. Across samples, work and studies were the domains that most participants reported being perfectionistic in, followed by bodily hygiene, spelling, and presentation of documents. Whereas age, gender, and satisfaction with life showed significant relationships with selected domains of life, perfectionism showed significant positive correlations with the overall score (number of domains affected by perfectionism) and with
being perfectionistic in individual domains. Further analyses showed that self-oriented perfectionism,
rather than socially prescribed perfectionism, was responsible for these correlations. The findings indicate
that, in most domains, being perfectionistic is internally motivated and not externally motivated. Moreover, they show that, while some perfectionists may be perfectionistic across domains, most perfectionists are perfectionistic only in selected domains
Output Feedback Invariants
The paper is concerned with the problem of determining a complete set of
invariants for output feedback. Using tools from geometric invariant theory it
is shown that there exists a quasi-projective variety whose points parameterize
the output feedback orbits in a unique way. If the McMillan degree ,
the product of number of inputs and number of outputs, then it is shown that in
the closure of every feedback orbit there is exactly one nondegenerate system.Comment: 15 page
Traveling Dark Solitons in Superfluid Fermi Gases
Families of dark solitons exist in superfluid Fermi gases. The
energy-velocity dispersion and number of depleted particles completely
determines the dynamics of dark solitons on a slowly-varying background
density. For the unitary Fermi gas we determine these relations from general
scaling arguments and conservation of local particle number. We find solitons
to oscillate sinusoidally at the trap frequency reduced by a factor of
. Numerical integration of the time-dependent Bogoliubov-de Gennes
equation determines spatial profiles and soliton dispersion relations across
the BEC-BCS crossover and proves consistent with the scaling relations at
unitarity.Comment: Small changes in response to referee's comments; fig 1 revised and
refs updated. Cross listed to nucl-th due to interest in the unitary Fermi
ga
Time-crystalline behavior in an engineered spin chain ?
Time crystals appear when systems display a commensurate spontaneous breaking
of the discrete time translational invariance imposed by an external periodic
drive. No consensus on the definition has been reached as yet, but important
aspects comprise robustness against small variations of the parameters and the
initial quantum state. Often, disorder and interaction are thought to be
essential ingredients for the occurrence of time crystals. We study a
finite-length polarized XX spin chain engineered to display a spectrum of
equidistant energy levels without drive and show that it keeps a spectrum of
equidistant quasienergies in Floquet theory for a large variety of periodic
driving schemes. This interesting behavior is explained by mapping the XX spin
chain with sites to a single large spin with invoking the closure
of the group SU(2). For suitably tuned parameters this system realizes time
crystals of various periodicities for \emph{all} initial states. The robustness
against variations of the parameters is also discussed. Thereby, we establish a
clean system without interaction which can display the phenomenon of time
crystallization.Comment: 17 pages, 5 figures. Title changed. Extended discussion of disorder
effects. Accepted for publication in Phys. Rev.
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