34,948 research outputs found
Getting Started as a Medical Teacher in Times of Change
No full textMedical school teaching is a skill that is very often learned on the job. The faculty comprised of researchers and clinicians are expert in many biomedical disciplines, but familiarity with learning theories and pedagogy are usually not included in their knowledge and skill sets. The pressure to see patients and acquire extramural funding leaves little time for faculty to learn how to teach. When coupled with the natural attrition of senior faculty it is necessary to start junior faculty on the correct path to being effective medical educators who are capable of lecturing and facilitating. Institutions cannot afford to have medical educators learn through trial and error. The standards set by the Liaison Committee on Medical Education (LCME) are also creating an urgency to produce competent teachers as quickly as possible. Novice teachers need to be able to use these standards to align their teaching with goals, objectives and the appropriate pedagogy. This article is designed to be a self-directed guide describing some essentials that a newly hired faculty member can quickly use to get started. An institutional faculty development program can then serve to build upon and enrich the experience for the new faculty member.This is the authors' accepted manuscript of the article. The final publication is available at Springer via http://dx.doi.org/doi:10.1007/s40670-014-0098-y.Peer reviewe
Farrell-Jones spheres and inertia groups of complex projective spaces
No full textWe introduce and study a new class of homotopy spheres called Farrell-Jones spheres. Using Farrell-Jones sphere we construct examples of closed negatively curved manifolds M-2n, where n = 7 or 8, which are homeomorphic but not diffeomorphic to complex hyperbolic manifolds, thereby giving a partial answer to a question raised by C. S. Aravinda and F. T. Farrell. We show that every exotic sphere not bounding a spin manifold (Hitchin sphere) is a Farrell-Jones sphere. We also discuss the relationship between inertia groups of CPn and Farrell-Jones spheres
Sous-facteurs de L(F∞) d'indice 4cos2π/n,n≥3
No full textLet Q be a factor of type II1, λ a number in the Jones discrete series {4cosπ/m:m≥3}, and {ei} the Jones projections associated with λ. Denote by A2n and A1n the finite-dimensional von Neumann algebras generated, respectively, by {1,e2,⋯,en} and {1,e1,⋯,en}, with the corresponding traces. The author shows that, for n sufficiently large, the index of the inclusion An=(Q⊗A2n)∗A2nA1n⊂(Q⊗A2n+1)∗A2n+1A1n+1=An+1 is equal to λ (here ∗ denotes the reduced, amalgamated free product of the algebras in question). Using the random matrix model of Voiculescu, he proves that if Q is the von Neumann algebra L(F∞) of the free group with infinitely many generators, then An is isomorphic to L(F∞).
The two facts together imply the existence, for any λ in the Jones discrete series, of an irreducible subfactor of L(F∞) of index λ. This constitutes the first example of a nonhyperfinite, non-Γ II1 factor such that its Jones invariant is fully computable (the existence of nonirreducible subfactors of L(F∞) for any index ≥4 is a simple consequence of known results)
Joseph F. Conwell's 1997 Book Impelling Spirit, and Walter J. Ong's Thought
No full textSee the above abstract.In my 8,000-word meditative review essay "Joseph F. Conwell's 1997 Book Impelling Spirit, and Walter J. Ong's Thought," I highlight the late American Jesuit spiritual director and church historian Joseph F. Conwell's 600-page 1997 book titled Impelling Spirit: Revisiting a Founding Experience [in] 1539 [of] Ignatius of Loyola and His Companions: An Exploration into the Spirit and Aims of the Society of Jesus as Revealed in the Founders' Proposed Papal Letter Approving the Society (Chicago: Jesuit Way/ Loyola Press). I also discuss the Spiritual Exercises of St. Ignatius Loyola. In addition, I highlight the mature thought of the American Jesuit Renaissance specialist and cultural historian Walter J. Ong (1912-2003; Ph.D. in English, Harvard University, 1955).N/AFarrell, Thomas. (2022). Joseph F. Conwell's 1997 Book Impelling Spirit, and Walter J. Ong's Thought. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/225838
Joseph F. Conwell's Perceptive 2003 Book Walking in the Spirit
No full textIn addition to highlighting Conwell's 2003 book about Jeronimo Nadal and St. Ignatius Loyola, I also mention Pope Francis, the first Jesuit pope, and quote something he said, from the Italian philosophy professor Massimo Borghesi's new 2021 book Catholic Discordance: Neoconservatism vs. the Field Hospital Church of Pope Francis, translated from the Italian by Barry Hudock (Collegeville, MN: Liturgical Press Academic).In my 3,225-word review essay "Joseph F. Conwell's Perceptive 2003 Book Walking in the Spirit," I highlight the late American Jesuit spiritual director Joseph F. Conwell's 2003 book Walking in the Spirit: A Reflection on Jeronimo Nadal's Phrase "Contemplative Likewise in Action" (St. Louis: Institute of Jesuit Sources). Jeronimo Nadal (1507-1580) had already been ordained a priest and had already earned a doctorate in theology when he entered the Society of Jesus in 1545. In the Jesuit order, Nadal worked closely with the Spanish Renaissance mystic St. Ignatius Loyola (1491-1556), the founder of the Society of Jesus, when he was writing the Society's Constitutions. Nadal coined the phrase (about Ignatius) "Contemplative Likewise in Action" in 1557.N/AFarrell, Thomas. (2022). Joseph F. Conwell's Perceptive 2003 Book Walking in the Spirit. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/226014
Pulse-pumping of cascaded Raman fibre amplifiers
No full textIn this thesis, I investigate cascaded Raman fibre amplifiers (RFAs) pumped with shaped optical pulses delivered from a Yb doped fibre MOPA source. RFAs offer the potential to generate gain at any arbitrary wavelength with an appropriate pump source, limited only by the fibre’s transparency range. The use of a counter-propagating signal and pump creates a continuous gain, despite the instantaneous nature of stimulated Raman scattering (SRS). A high power Yb doped fibre source emitting around the 1050 to 1100 nm region offers a flexible pump source that can in principle be used to generate gain for any signal from ~1100 to 2000 nm in a silica-based fibre via cascaded SRS. This opens up opportunities for an ultrabroadband amplifier with unmatched spectral width. Furthermore, by using a pump source that is in a MOPA configuration there is a high degree of control over the output characteristics which offers the potential of near-instantaneous electronic control of ultra-broadband Raman gain spectra. In the simplest configuration, cascaded Raman wavelength shifting across a wide range of wavelengths using single-level pump pulses (i.e., approximate super-Gaussian pulses) is investigated. Using a silica-based highly nonlinear fibre (HNLF), cascaded Raman wavelength shifting up to seven Stokes orders is demonstrated and counter-propagating gain measurements are made across all seven Stokes orders. From a pump wavelength of 1064 nm, the peak gain of the 7th Stokes order was ~1575 nm which demonstrated the potential for gain covering more than 500 nm. I believe this is the first time such a measurement has been undertaken. Other fibre types were also studied for comparison. Furthermore, the noise performance and gain saturation properties of cascaded RFAs were investigated, as well. In a more advanced configuration, the Raman gain spectra produced from pumping the HNLF with step-shaped pump pulses are investigated. Such pulses consist of multiple levels with different, controllable, instantaneous powers. By adjusting the power of each step appropriately I show that different parts of the pulse transfer their energy to different Stokes orders, leading to a controllable gain spectrum covering multiple Stokes orders at the same time. I further study how the gain spectrum can be controlled by manipulating the individual duty cycle of each section of the step-shaped pump pulses as well as using multiple pump wavelengths in a time-division multiplexed pumping scheme. Single and dual wavelength pumping of various fibres with step-shaped pulses was experimentally demonstrated. Raman gain spectra spanning two and three Stokes orders and covering over 100 nm were realised. Computer simulations are also carried out for pumping with more than two pump wavelengths and for gain spectra targeting gain simultaneously up to seven Stokes orders and covering up to ~500 nm. This shows that the use of step-shaped pulses and multiple pump wavelengths allow for further increase and control of the useable bandwidth
Postać n-tej iteracji operatora q = f d/dx
No full textArtykuł nie zawiera streszczeniaMotivated by applications in linear dynamical systems, the author studies q^n(f), where q is the operator f●(d/dx) and qn is its n-th iteration. q^n(f) is a polynomial F(f(0),f(1),...,f(n)) in the derivatives f(0)=f,...,f(n) of f with integer coefficients. Special attention is paid to determining the coefficients of F. The author presents algorithms for computing the coefficients and also shows that the sum of all coefficients of F equals n!. The paper ends with some remarks on the number of coefficients of F, which is related to the number-theoretic unrestricted partition function
Edward F. Edinger's 1995 Book on Melville's Moby-Dick (1851), and Walter J. Ong's Thought
No full textSee the above abstract.In my 5,625-word review essay "Edward F. Edinger's 1995 Book on Melville's Moby-Dick (1851), and Walter J. Ong's Thought," I discuss Edinger's book Melville's Moby-Dick: An American Nekyia, the re-titled and revised and updated edition of his 1978 book Melville's Moby-Dick: A Jungian Commentary: An American Nekyia. In printed editions of the Homeric epic the Odyssey, Book Eleven about Odysseus' visit to the underworld is titled Nekyia. Edinger's thesis is that in the process of writing Moby-Dick, Melville visited the underworld in his psyche, figuratively speaking. In Jungian terminology, the underworld in one's psyche is known as the collective unconscious, home of the archetypes, including the archetype of the Self (capitalized to distinguish it from the lower-case self of ego-consciousness). I frame my discussion of Edinger's lucidly written and accessible book in the larger conceptual framework of thought of the American Jesuit Renaissance specialist and cultural historian Walter J. Ong (1912-2003; Ph.D. in English, Harvard University, 1955).N/AFarrell, Thomas J. (2020). Edward F. Edinger's 1995 Book on Melville's Moby-Dick (1851), and Walter J. Ong's Thought. Retrieved from the University Digital Conservancy, https://hdl.handle.net/11299/214097
A Raman fibre amplifier generating simultaneous gain across multiple Stokes orders by using step shaped optical pulses
No full textOptical amplification based on stimulated Raman scattering (SRS) in optical fibres offers the potential to generate gain at any arbitrary wavelength with an appropriate pump source. This has proved a very effective and successful way of providing gain at those wavelengths not directly available with rare-earth doped fibres. However most of this success has been achieved using CW pump sources, but in recent years there has been renewed interest in the pulsed pumping of Raman amplifiers
Ratio of n-6/n-3 in the diets of beef cattle
No full textEffects of feeding heat-treated canola (C), soybean (S) and flax (F) or mixtures on growth and slaughter characteristics, taste and fatty acid (FA) composition of beef tissue were investigated using 128 crossbred steers to determine the potential of improving the nutritional quality of beef for humans. For Trial 1 (48 steers), dietary treatments were: roasted C, extruded C, roasted S, extruded S, roasted F and extruded F. For Trial 2 (80 steers), the dietary treatments were: S:F (1:1), S:C (1:1), C:F (1:1) and S:F:C (1:1:1), and the oilseeds were processed either by roasting or extruding before mixing. Soybean meal and soybean oil were used to give equivalent lipid and protein contents to each experimental diet. The basal diet consisted of grass silage, barley grain, vitamins and minerals. Steers were fed for a minimum of 100d then slaughtered at a uniform degree of finish. Growth and slaughter characteristics of the steers were only slightly affected by dietary treatment in that the soybean-fed steers consumed more feed and had a higher average daily gain than the canola or flax-fed animals in Trial 1. There was no difference in taste panel parameters for any of the treatments. Inclusion of flax in the diet increased the total n-3 content of meat. Similar results were found for canola and C18:1n-9 although this was not the case for soybean and the n-6 FA. For the n-6 FA in the PL and neutral lipid fractions of the meat samples, levels were correlated with high dietary levels of n-6 or n-9 with low levels of n-3 while for the n-3 FA, levels were correlated with high dietary n-3 levels and low n-6 levels. Oilseed processing method did not have an effect on any fatty acid levels. It is possible to modify the FA composition of beef meat toward a healthier profile by including heat-treated oilseeds in the diet to influence the degree of lipid metabolism in the rumen.ID: S0377840111004007; M3: Article; Accession Number: S0377840111004007; Author: M.A. McNiven (a, ⁎); Author: J.L. Duynisveld (b); Author: T. Turner (a); Author: A.W. Mitchell (a); Affiliation: Department of Health Management, Atlantic Veterinary College, University of PEI, Charlottetown, PEI, Canada C1A 4P3; Affiliation: Agriculture and Agri-Food Canada, Nappan, NS, Canada B0L 1C0; Keyword: Oilseeds; Keyword: Roasted; Keyword: Extruded; Keyword: Fatty acids; Keyword: Healthy fat; Number of Pages: 11; Language: English
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