1,550 research outputs found
Narrative transformation among military personnel on an adventurous training and sport course.
Negotiating sexuality and masculinity in school sport: An autoethnography
This autoethnography explores challenging and ethically sensitive issues around sexual orientation, sexual identity and masculinity in the context of school sport. Through storytelling, I aim to show how sometimes ambiguous encounters with heterosexism, homophobia and hegemonic masculinity through sport problematise identity development for young same-sex attracted males. By foregrounding personal embodied experience, I respond to an absence of stories of gay and bisexual experiences among males in physical education and school sport, in an effort to reduce a continuing sense of Otherness and difference regarding same-sex attracted males. I rely on the story itself to express the embodied forms of knowing that inhabit the experiences I describe, and resist a finalising interpretation of the story. Instead, I offer personal reflections on particular theoretical and methodological issues which relate to both the form and content of the story
Sexual abuse and the grooming process in sport: Learning from Bella's story
Through a process of collaborative autoethnography, we explore the experiences of one female athlete named Bella who was groomed and then sexually abused by her male coach. Bellaâs story signals how the structural conditions and power relationships embedded in competitive sporting environments, specifically the power invested in the coach, provide a unique sociocultural context that offers a number of potentialities for sexual abuse and exploitation to take place. We offer Bellaâs story as a pedagogical resource for those involved in the world of sport to both think about and with as part of a process of encouraging change at the individual and institutional levels
Storage and Manipulation of Light Using a Raman Gradient Echo Process
The Gradient Echo Memory (GEM) scheme has potential to be a suitable protocol
for storage and retrieval of optical quantum information. In this paper, we
review the properties of the -GEM method that stores information in
the ground states of three-level atomic ensembles via Raman coupling. The
scheme is versatile in that it can store and re-sequence multiple pulses of
light. To date, this scheme has been implemented using warm rubidium gas cells.
There are different phenomena that can influence the performance of these
atomic systems. We investigate the impact of atomic motion and four-wave mixing
and present experiments that show how parasitic four-wave mixing can be
mitigated. We also use the memory to demonstrate preservation of pulse shape
and the backward retrieval of pulses.Comment: 26 pages, 13 figure
Recommended from our members
Evaluating femtosecond laser ablation of graphene on SiO<inf>2</inf>/Si substrate
We demonstrate a uniform single layer micropattern of graphene on 300ânm thick SiO2 on a Si substrate using a 1030ânm, 280 fs laser. The cutting process was conducted in air, the pattern defined through the motion of a high-precision translation stage. Approximately 1.6âÎŒm wide graphene microchannels were cut with uniform widths and well defined edges. The ablation threshold of graphene was determined to be 66â120 mJ/cm2, at which the selective removal of graphene was achieved without damage to the SiO2/Si substrate. Scanning electron microscopy images revealed high quality cuts (standard deviation 40ânm) with little damage or re-deposition. Raman maps showed no discernible laser induced damage in the graphene within the ablation zone. Atomic force microscopy revealed an edge step height ranging from less than 2 to 10ânm, suggesting little removal of SiO2 and no damage to the silicon (the central path showed sub ablation threshold swelling). The effect of the ultrafast laser on the surface potential at the cut edge has been measured and it showed a distinguishable boundary.This work was supported by The Engineering and Physical Sciences Research Council (EPSRC) and National University of Defence Technology (NUDT). The authors also thank Cambridge Graphene Centre (CGC).This is the final version of the article. It first appeared from the American Institute of Physics via http://dx.doi.org/10.2351/1.494451
A Scalable, Self-Analyzing Digital Locking System for use on Quantum Optics Experiments
Digital control of optics experiments has many advantages over analog control
systems, specifically in terms of scalability, cost, flexibility, and the
integration of system information into one location. We present a digital
control system, freely available for download online, specifically designed for
quantum optics experiments that allows for automatic and sequential re-locking
of optical components. We show how the inbuilt locking analysis tools,
including a white-noise network analyzer, can be used to help optimize
individual locks, and verify the long term stability of the digital system.
Finally, we present an example of the benefits of digital locking for quantum
optics by applying the code to a specific experiment used to characterize
optical Schrodinger cat states.Comment: 7 pages, 5 figure
Photon number discrimination without a photon counter and its application to reconstructing non-Gaussian states
The non-linearity of a conditional photon-counting measurement can be used to
`de-Gaussify' a Gaussian state of light. Here we present and experimentally
demonstrate a technique for photon number resolution using only homodyne
detection. We then apply this technique to inform a conditional measurement;
unambiguously reconstructing the statistics of the non-Gaussian one and two
photon subtracted squeezed vacuum states. Although our photon number
measurement relies on ensemble averages and cannot be used to prepare
non-Gaussian states of light, its high efficiency, photon number resolving
capabilities, and compatibility with the telecommunications band make it
suitable for quantum information tasks relying on the outcomes of mean values.Comment: 4 pages, 3 figures. Theory section expanded in response to referee
comment
The kinematics and kinetics of riding a racehorse: A quantitative comparison of a training simulator and real horses
Electromagnetically induced transparency and four-wave mixing in a cold atomic ensemble with large optical depth
We report on the delay of optical pulses using electromagnetically induced
transparency in an ensemble of cold atoms with an optical depth exceeding 500.
To identify the regimes in which four-wave mixing impacts on EIT behaviour, we
conduct the experiment in both rubidium 85 and rubidium 87. Comparison with
theory shows excellent agreement in both isotopes. In rubidium 87, negligible
four-wave mixing was observed and we obtained one pulse-width of delay with 50%
efficiency. In rubidium 85, four-wave-mixing contributes to the output. In this
regime we achieve a delay-bandwidth product of 3.7 at 50% efficiency, allowing
temporally multimode delay, which we demonstrate by compressing two pulses into
the memory medium.Comment: 8 pages, 6 figure
- âŠ