6,243 research outputs found
College Greek Life: Perceptions and Lived Experiences of Lesbian, Gay, Bisexual, Transgender, Questioning, and Queer (LGBTQ) Students
This is a qualitative study conducted at a small, private Midwestern university to gain an understanding of the social climate of Greek sorority and fraternity houses as it relates to the acceptance of sexual diversity. In-depth interviews with 11 LGBTQ students were conducted to gain an understanding of the perceptions and experiences of gay students with the Greek system. A number of themes emerged, including general decisions to join a Greek fraternity or sorority; the impact of sexual orientation; aspects of the sorority and fraternity lifestyle; gender norms and perceptions of sexuality: males versus females; Greek-Affiliated LGBTQ students: in-house experiences; and perceived reality versus overt discrimination. Conclusions established from these themes were based on the overall aggregate perceptions found in each interview andâthrough examination of each topicâfound that LGBTQ students, though citing many positive experiences with Greek culture, possess a generally negative and apprehensive perception of sororities and fraternities as a whole. These perceptions relate heavily to larger societal norms and roles of gender and sexuality and the fact that such norms are exacerbated in the condensed environment that characterizes the college Greek institution
Equipment-tolerant range code demodulation method - A concept
Demodulation loop of automatic range-measuring system uses reference signal wave of locally generated pseudo-noise plus square wave of same period as the clock. Phase instabilities in IF amplifiers appear only as gain changes in the loop, and do not cause errors in range determination
The Not-So-Sterile 4th Neutrino: Constraints on New Gauge Interactions from Neutrino Oscillation Experiments
Sterile neutrino models with new gauge interactions in the sterile sector are
phenomenologically interesting since they can lead to novel effects in neutrino
oscillation experiments, in cosmology and in dark matter detectors, possibly
even explaining some of the observed anomalies in these experiments. Here, we
use data from neutrino oscillation experiments, in particular from MiniBooNE,
MINOS and solar neutrino experiments, to constrain such models. We focus in
particular on the case where the sterile sector gauge boson couples also
to Standard Model particles (for instance to the baryon number current) and
thus induces a large Mikheyev-Smirnov-Wolfenstein potential. For eV-scale
sterile neutrinos, we obtain strong constraints especially from MINOS, which
restricts the strength of the new interaction to be less than times
that of the Standard Model weak interaction unless active-sterile neutrino
mixing is very small (). This rules out
gauge forces large enough to affect short baseline experiments like MiniBooNE
and it imposes nontrivial constraints on signals from sterile neutrino
scattering in dark matter experiments.Comment: 19 pages, 9 figure
Electronic structure and magnetic properties of RMnX (R= Mg, Ca, Sr, Ba, Y; X= Si, Ge) studied by KKR method
Electronic structure calculations, using the charge and spin self-consistent
Korringa- Kohn-Rostoker (KKR) method, have been performed for several Mn
compounds ( = Mg, Ca, Sr, Ba, Y; = Si, Ge) of the CeFeSi-type structure.
The origin of their magnetic properties has been investigated emphasizing the
role of the Mn sublattice. The significant influence of the Mn-Mn and Mn-
interatomic distances on the Mn magnetic moment value is delineated from our
computations, supporting many neutron diffraction data. We show that the marked
change of with the Mn-Mn and Mn- distances resulted from a
redistribution between spin-up and spin-down -Mn DOS rather than from
different fillings of the Mn 3-shell. Bearing in mind that the neutron
diffraction data reported for the Mn compounds are rather scattered, the
KKR computations of are in fair agreement with the experimental
values. Comparing density of states near obtained in different magnetic
orderings, one can notice that the entitled Mn systems seem to 'adapt'
their magnetic structures to minimize the DOS in the vicinity of the Fermi
level. Noteworthy, the SrMnGe antiferromagnet exhibits a pseudo-gap behaviour
at , suggesting anomalous electron transport properties. In addition,
the F-AF transition occurring in the disordered LaYMnSi alloy for
the range is well supported by the DOS features of
LaYMnSi. In contrast to the investigated Mn compounds,
YFeSi was found to be non-magnetic, which is in excellent agreement with the
experimental data.Comment: 10 pages + 14 figures, to appear in Eur. Phys. Jour.
The in-flight calibration of the Hubble space telescope attitude sensors
A detailed review of the in-flight calibration of the Hubble Space Telescope attitude sensors is given. The review, which covers the period from the April 24, 1990 launch of the spacecraft until April 1991, describes the calibrations required and accuracies achieved for the four principal attitude sensing systems on the spacecraft: the magnetometers, the fixed-head star trackers, the gyroscopes, and the fine guidance sensors
The in-flight calibration of the Hubble Space Telescope attitude sensors
A detailed review of the in-flight calibration of the Hubble Space Telescope attitude sensors is presented. The review, which covers the period from the April 24, 1990, launch of the spacecraft until the time of this writing (June 1991), describes the calibrations required and accuracies achieved for the four principal attitude sensing systems on the spacecraft: the magnetometers, the fixed head star trackers, the gyroscopes, and the fine guidance sensors (FGS's). In contrast to the other three sensor groups, the Hubble Telecope's FGS's are unique in the precision and performance levels being attempted; spacecraft control and astrometric research at the near-milliarcsecond level are the ultimate goals. FGS calibration accuracies at the 20-milliarcsecond level have already been achieved, and plans for new data acquisitions and reductions that should substantially improve these results are in progress. A summary of the basic attributes of each of the four sensor groups with respect to its usage as an attitude measuring system is presented, followed by a discussion of the calibration items of interest for that group. The calibration items are as follows: for the magnetometers, the corrections for the spacecraft's static and time-varying magnetic fields; for the fixed-head star trackers, their relative alignments and use in performing onboard attitude updates; for the gyroscopes, their scale factors, alignments, and drift rate biases; and for the FGS's, their magnifications, optical distortions, and alignments. The discussion covers the procedures used for each calibration, as well as the order of the calibrations within the general flow of orbital verification activities. It also includes a synopsis of current plans for the eventual calibration of the FGS's to achieve their near-milliarcsecond design accuracy. The conclusions include a table indicating the current and predicted ultimate accuracies for each of the calibration items
An emergence perspective on entrepreneurship: processes, structure and methodology
This paper explores entrepreneurship from the perspective of emergence, drawing on literature in
complexity theory, social theory and entrepreneurship. Entrepreneurship is conceptualised as the
production of emergence, or emergent properties, via a simple model of initial conditions, processes of
emergence that produces emergent properties at multiple levels (new phenomena such as products,
services, firms, networks, patterns of behaviour, identities). Conceptualisation through emergence thus
embraces actors, context, processes and (structural) outcomes. This paper builds on previous work that
theorises the relationship between entrepreneurship and social change. We extend that work by
considering the methodological implications of relating processes of entrepreneurship to the emergence
of new phenomena
Revisiting Large Neutrino Magnetic Moments
Current experimental sensitivity on neutrino magnetic moments is many orders
of magnitude above the Standard Model prediction. A potential measurement of
next-generation experiments would therefore strongly request new physics beyond
the Standard Model. However, large neutrino magnetic moments generically tend
to induce large corrections to the neutrino masses and lead to fine-tuning. We
show that in a model where neutrino masses are proportional to neutrino
magnetic moments. We revisit, discuss and propose mechanisms that still provide
theoretical consistent explanations for a potential measurement of large
neutrino magnetic moments. We find only two viable mechanisms to realize large
transition magnetic moments for Majorana neutrinos only.Comment: 12 pages, 7 figure
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