13,228 research outputs found
Remote terminal system evaluation
An Earth Resources Data Processing System was developed to evaluate the system for training, technology transfer, and data processing. In addition to the five sites included in this project two other sites were connected to the system under separate agreements. The experience of these two sites is discussed. The results of the remote terminal project are documented in seven reports: one from each of the five project sites, Purdue University, and an overview report summarizing the other six reports
The engagement of further and higher education with the London 2012 Olympic and Paralympic Games
Podium commissioned the Centre for Sport, Physical Education & Activity Research (SPEAR) at Canterbury Christ Church University to carry out research to capture the engagement of the further and higher education sectors and related stakeholders with the past, current and future opportunities presented by the London 2012 Olympic and Paralympic Games. The full report was released on 15 March 2011 to mark 500 days to go until the start of London 2012
Optimal squeezing, pure states, and amplification of squeezing in resonance fluorescence
It is shown that 100% squeezed output can be produced in the resonance
fluorescence from a coherently driven two-level atom interacting with a
squeezed vacuum. This is only possible for squeezed input, and is
associated with a pure atomic state, i.e., a completely polarized state. The
quadrature for which optimal squeezing occurs depends on the squeezing phase
the Rabi frequency and the atomic detuning . Pure
states are described for arbitrary not just or as in
previous work. For small values of there may be a greater degree of
squeezing in the output field than the input - i.e., we have squeezing
amplification.Comment: 6 pages & 7 figures, Submitted to Phys. Rev.
Mobile Augmented Reality and Language-Related Episodes
Applications of locative media (e.g., placeâbased mobile augmented reality [AR]) are used in various educational content areas and have been shown to provide learners with valuable opportunities for investigationâbased learning, locationâsituated social and collaborative interaction, and embodied experience of place (Squire, 2009; Thorne & Hellermann, 2017; Zheng et al., 2018). Mobile locative media applicationsâ value for language learning, however, remains underinvestigated. To address this lacuna, this study employed the widely used construct of languageârelated episodes (LREs; Swain & Lapkin, 1998) as a unit of analysis to investigate language learning through participation in a mobile AR game. Analysis of videorecorded interactions of four mixedâproficiency groups of game players (two English language learners [ELLs] and one expert speaker of English [ESE] per group) indicates that LREs in this environment were focused on lexical items relevant to the AR tasks and physical locations. Informed by sociocultural theory and conversation analysis, the microgenesis of learnersâ understanding and subsequent use of certain lexical items are indicated in the findings. This understanding of new lexical items was frequently facilitated by ESEsâ assistance and the surrounding physical environment. A strong goal orientation by both ESEs and ELLs was visible, providing implications for taskâbased language teaching approaches
Quantum interference in optical fields and atomic radiation
We discuss the connection between quantum interference effects in optical
beams and radiation fields emitted from atomic systems. We illustrate this
connection by a study of the first- and second-order correlation functions of
optical fields and atomic dipole moments. We explore the role of correlations
between the emitting systems and present examples of practical methods to
implement two systems with non-orthogonal dipole moments. We also derive
general conditions for quantum interference in a two-atom system and for a
control of spontaneous emission. The relation between population trapping and
dark states is also discussed. Moreover, we present quantum dressed-atom models
of cancellation of spontaneous emission, amplification on dark transitions,
fluorescence quenching and coherent population trapping.Comment: To be published in Journal of Modern Optics Special Issue on Quantum
Interferenc
Simulation of Water Cerenkov Detectors Using {\sc geant4}
We present a detailed simulation of the performance of water Cerenkov
detectors suitable for use in the Pierre Auger Observatory. Using {\sc geant4},
a flexible object-oriented simulation program, including all known physics
processes, has been developed. The program also allows interactive
visualization, and can easily be modified for any experimental setup.Comment: Talk to be presented at the XI Symposium on Very High Energy Cosmic
Ray Interaction
A social constructivist approach to introducing skills for employment to Foundation Degree students
Expectations for higher education providers to produce graduates ready for the workplace have shaped provision, with the introduction of the Foundation Degree, and expectations of an employability component within higher education programmes. This paper reports on an intervention for three groups of foundation degree students, which introduces them to ideas of skills for employability. An initial evaluation was followed up two months later exploring the longer-term impact and connections within students' programmes of study and data were captured from employers and tutors supporting this intervention. In agreement with similar studies, benefits for students were identified. However, this research reinforces the challenging nature of the employability agenda, particularly within the context of Foundation Degrees and their dual vocational-academic remit. This paper suggests there is a case to be made for a social constructivist approach within programmes and institutions for promoting awareness and consistency in developing student employability skills. © 2013 © 2013 Further Education Research Association
Early postpartum restingâstate functional connectivity for mothers receiving buprenorphine treatment for opioid use disorder: A pilot study
Between 1999 and 2014, the prevalence of opioid use disorder (OUD) among pregnant women quadrupled in the USA. The standard treatment for peripartum women with OUD is buprenorphine. However, the maternal behavior neurocircuit that regulates maternal behavior and motherâinfant bonding has not been previously studied for human mothers receiving buprenorphine treatment for OUD (BT). Rodent research shows opioid effects on reciprocal inhibition between maternal care and defence maternal brain subsystems: the hypothalamus and periaqueductal gray, respectively. We conducted a longitudinal functional magnetic resonance imaging (fMRI) pilot study in humans to specifically examine restingâstate functional connectivity (rsâFC) between the periaqueductal gray and hypothalamus, as well as to explore associations with maternal bonding for BT. We studied 32 mothers who completed fMRI scans at 1Â month (T1) and 4Â months postpartum (T2), including seven mothers receiving buprenorphine for OUD and 25 nonâOUD mothers as a comparison group (CG). The participants underwent a 6âminute restingâstate fMRI scan at each time point. We measured potential bonding impairments using the Postpartum Bonding Questionnaire to explore how rsâFC with periaqueductal gray is associated with bonding impairments. Compared to CG, BT mothers differed in periaqueductal grayâdependent rsâFC with the hypothalamus, amygdala, insular cortex and other brain regions at T1, with many of these differences disappearing at T2, suggesting potential therapeutic effects of continuing buprenorphine treatment. In contrast, the ârejection and pathological angerâ subscale of the Postpartum Bonding Questionnaire at T1 and T2 was associated with the T1âtoâT2 increases in periaqueductal grayâdependent rsâFC with the hypothalamus and amygdala. Preliminary evidence links maternal bonding problems for mothers with OUD early in the postpartum to connectivity between specific care and defence maternal brain circuits, which may be mitigated by buprenorphine treatment. This exploratory study supports a potential mechanism for investigating both the therapeutic benefits and risks of opioids for maternal care and bonding with infants.Peer Reviewedhttps://deepblue.lib.umich.edu/bitstream/2027.42/151866/1/jne12770.pdfhttps://deepblue.lib.umich.edu/bitstream/2027.42/151866/2/jne12770_am.pd
The Rotating-Wave Approximation: Consistency and Applicability from an Open Quantum System Analysis
We provide an in-depth and thorough treatment of the validity of the
rotating-wave approximation (RWA) in an open quantum system. We find that when
it is introduced after tracing out the environment, all timescales of the open
system are correctly reproduced, but the details of the quantum state may not
be. The RWA made before the trace is more problematic: it results in incorrect
values for environmentally-induced shifts to system frequencies, and the
resulting theory has no Markovian limit. We point out that great care must be
taken when coupling two open systems together under the RWA. Though the RWA can
yield a master equation of Lindblad form similar to what one might get in the
Markovian limit with white noise, the master equation for the two coupled
systems is not a simple combination of the master equation for each system, as
is possible in the Markovian limit. Such a naive combination yields inaccurate
dynamics. To obtain the correct master equation for the composite system a
proper consideration of the non-Markovian dynamics is required.Comment: 17 pages, 0 figures
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