12,871 research outputs found
Hydraulic brake safety valve
Safety device, consisting of three separate fluid chambers, insures that two wheels of a brake system continue to function if a failure occurs
Separation of foregrounds from cosmic microwave background observations with the MAP satellite
Simulated observations of a 10\dg \times 10\dg field by the Microwave
Anisotropy Probe (MAP) are analysed in order to separate cosmic microwave
background (CMB) emission from foreground contaminants and instrumental noise
and thereby determine how accurately the CMB emission can be recovered. The
simulations include emission from the CMB, the kinetic and thermal
Sunyaev-Zel'dovich (SZ) effects from galaxy clusters, as well as Galactic dust,
free-free and synchrotron. We find that, even in the presence of these
contaminating foregrounds, the CMB map is reconstructed with an rms accuracy of
about 20 K per 12.6 arcmin pixel, which represents a substantial
improvement as compared to the individual temperature sensitivities of the raw
data channels. We also find, for the single 10\dg \times 10\dg field, that
the CMB power spectrum is accurately recovered for \ell \la 600.Comment: 7 pages, 7 figures, MNRAS submitte
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Finite aperture Fraunhofer holograms of two co-planar discs
In this paper we present a theoretical model describing the real images replayed from finite aperture Fraunhofer holograms of two identical co-planar objects. We have solved numerically the resulting image equations for the case of two circular disc objects, and compare our predictions with experimental measurements from in-line Fraunhofer holograms recorded on silver-halide emulsions. Three measurement criteria for calculating the disc diameters and separation are described, and their errors discussed. It is found experimentally that a criterion based on average intensity results in the smallest errors due to its insensitivity to the effects of coherent noise
Being subject-centred: A philosophy of teaching and implications for higher education
Being subject-centred as a higher education teacher offers a rich and illuminating philosophical and practical understanding of learning. Building upon previous research on subject-centred learning, we draw on reflection, literature review and a phenomenological approach to show how our ways of being infuse the teaching and learning environment. Philosophically, it is our way of being with our subject as teachers that influences the learning within our students. We show how posing the question: 'What is the best way to teach this subject?' helps a teacher find the best way to enhance the learning experience. It entails moving away from reliance solely on approaches that simply 're-present' content, such as lectures and online learning management systems, to interactive classrooms where space is created for the students to enter into their own engagement with the subject in a shared pursuit with the teacher, resulting in more effective teaching and learning. We illustrate this with personal accounts of our own journeys as teachers. We acknowledge that it takes courage to teach and to fully be subject-centred in the face of prevailing trends and pressures for other ways of teaching currently prominent in the higher education sector. But, ultimately, it is who we are as teachers that matters most, and being subject-centred provides the most effective way for us to most meaningfully reach our students
Identification. The missing link between joint attention and imitation
In this paper we outline our hypothesis that human intersubjective engagement entails identifying with other people. We tested a prediction derived from this hypothesis that concerned the relation between a component of joint attention and a specific form of imitation. The empirical investigation involved âblindâ ratings of videotapes from a recent study in which we tested matched children with and without autism for their propensity to imitate the self-/other-orientated aspects of another person's actions. The results were in keeping with three a priori predictions, as follows: (a) children with autism contrasted with control participants in spending more time looking at the objects acted upon and less time looking at the tester; (b) participants with autism showed fewer âsharingâ looks toward the tester, and although they also showed fewer âcheckingâ and âorientatingâ looks, they were specifically less likely to show any sharing looks; and, critically, (c) within each group, individual differences in sharing looks (only) were associated with imitation of selfâother orientation. We suggest that the propensity to adopt the bodily anchored psychological stance of another person is essential to certain forms of joint attention and imitation, and that a weak tendency to identify with others is pivotal for the developmental psychopathology of autism
Teaching earth pressure theory using physical models: an example in civil engineering
The transition from basic Engineering courses in the first year of Civil Engineering curriculum, into the analysis and design of Civil Engineering structures can be challenging for students. Indeed, most students find it difficult in learning some of the theoretical courses in later years of their engineering studies. In this paper, discussions will be directed to the role of physical models in assisting the teachings of advanced Civil Engineering courses. Examples of
physical models will be shown by making use of those developed by the authors in the teaching of Geotechnical Engineering at University of Southern Queensland, Australia
An Optimal Skorokhod Embedding for Diffusions
Given a Brownian motion and a general target law (not necessarily
centered or even integrable) we show how to construct an embedding of in
. This embedding is an extension of an embedding due to Perkins, and is
optimal in the sense that it simultaneously minimises the distribution of the
maximum and maximises the distribution of the minimum among all embeddings of
. The embedding is then applied to regular diffusions, and used to
characterise the target laws for which a -embedding may be found.Comment: 22 pages, 4 figure
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