6,980 research outputs found
Halométallates de viologÚne, état de charge séparé photo-induit stable: quelques paramÚtres clés
Date du colloque : 06/2011</p
Alien Registration- Leblanc, Alexena N. (Ashland, Aroostook County)
https://digitalmaine.com/alien_docs/27387/thumbnail.jp
âWhen You Fail, You Feel Like a Failureâ : One Studentâs Experience of Academic Probation and an Academic Support Program
This in-depth, qualitative study explored the experience of academic probation. It recounts the story of Mark, an undergraduate student on academic probation who participated in an academic support program to attain good academic standing. His story is contrasted to the current literature on academic probation and is considered in light of Deweyâs (1958,1938/1997, 1934/2005) theory of experience. This paper offers an important contribution to the literature on higher education by revealing a rich, complex, and unique experience which illustrates that Mark does not correspond to the typical image of probationary students depicted in the literature. This article breaks away from an oversimplified portrayal of probationary students, offers a provisional conceptualization of academic probation, and calls for further definition of the notion of academic probation. Cette Ă©tude qualitative et dĂ©taillĂ©e a portĂ© sur lâexpĂ©rience de la probation acadĂ©mique. Elle Ă©voque lâhistoire de Mark, un Ă©tudiant du premier cycle en probation acadĂ©mique qui a participĂ© Ă un programme dâappui acadĂ©mique en vue dâamĂ©liorer son rendement. Nous comparons son histoire Ă la littĂ©rature actuelle sur la probation acadĂ©mique et lâexaminons Ă la lumiĂšre de la thĂ©orie de lâexpĂ©rience de Dewey (1958; 1938/1997; 1934/2005). Cet article reprĂ©sente une contribution importante Ă la littĂ©rature sur lâenseignement supĂ©rieur en dĂ©crivant une expĂ©rience riche, complexe et unique qui dĂ©montre que Mark ne correspond pas Ă lâimage type des Ă©tudiants en probation tel quâillustrĂ©e dans la littĂ©rature. Cet article sâĂ©loigne de la reprĂ©sentation exagĂ©rĂ©ment simplifiĂ©e des Ă©tudiants en probation, offre une conceptualisation provisoire de la probation acadĂ©mique et Ă©voque le besoin dâune nouvelle dĂ©finition de la notion de la probation acadĂ©mique
Stable Photoinduced Separated Charge State in Viologen Halometallates: Some Key Parameters
With the aim to define key parameters causing the photochromic properties of (MV)[Bi2Cl8] and (MV)(4)[Bi6Cl26] (MV2+, methylviologen; 1,1-dimethyl-4,4-bipyridinium), the effects of substituting Bi by Sb, Cl by Br, or MV2+ by MOV2+ (1,1-dimethoxy-4,4-bipyridinium) or MeMOV2+ (1-methyl-1-methoxy-4,4-bipyridinium) on the photoinduced charge transfer properties of such viologen halometallates are explored. It appears that only salts containing chlorobismuthate anions undergo a color change upon UV irradiation and that the nature of viologen entities has a key role in the process. We also suggest that a key parameter for observing the stable photoinduced separated charge state in chlorobismuthate viologen hybrids is a high chloride/viologen ratio, rather than the size of the anionic oligomer, as observed in the previously reported unique series (MV)((2n+2)/2)[Bi2nCl8n+2]
Monolithic InP-Based Grating Spectrometer for Wavelength-Division Multiplexed Systems at 1.5 ÎŒm
A monolithic InP-based grating spectrometer for use in wavelength-division multiplexed systems at 1.5 ÎŒm is reported.
The spectrometer uses a single etched reflective focusing diffraction grating and resolves >50 channels at 1 nm spacing with a ~0.3nm channel width and at least 19dB channel isolation. Operation is essentially of the state of the input polarisation
In vivo nuclear magnetic resonance imaging
A number of physiological changes have been demonstrated in bone, muscle and blood after exposure of humans and animals to microgravity. Determining mechanisms and the development of effective countermeasures for long duration space missions is an important NASA goal. The advent of tomographic nuclear magnetic resonance imaging (NMR or MRI) gives NASA a way to greatly extend early studies of this phenomena in ways not previously possible; NMR is also noninvasive and safe. NMR provides both superb anatomical images for volume assessments of individual organs and quantification of chemical/physical changes induced in the examined tissues. The feasibility of NMR as a tool for human physiological research as it is affected by microgravity is demonstrated. The animal studies employed the rear limb suspended rat as a model of mucle atrophy that results from microgravity. And bedrest of normal male subjects was used to simulate the effects of microgravity on bone and muscle
A/r/cography: art, research and communication
This article aims at establishing the foundations for a/r/cography as an âart and communicationâ-based research methodology, inspired by a/r/tography yet more encompassing, and particularly suitable for the digital art world. As part of the larger family of practice-based research methodologies, a/r/tography presents various ways through which it can be explored, but since it is aimed at the arts and education, its scope is forcibly hampered by the fact that not all researchers and art practitioners are necessarily teachers. However, since most of its underlying principles can be extended for non-teachers, thus arose the idea to propose a methodology that would retain ontological, epistemological and methodological assumptions, but would expand beyond the limitations imposed by the role of the teacher. This extension is called a/r/cography and is structured upon the interchangeable roles of artist, researcher and communicator, as being intrinsic to the underlying living inquiry processes. Furthermore, this proposal is supported by the authorâs own experience from a/r/cographic processes in the creation, exhibition and communication of digital artworks.info:eu-repo/semantics/publishedVersio
Extended crossover from Fermi liquid to quasi-antiferromagnet in the half-filled 2D Hubbard model
The ground state of the Hubbard model with nearest-neighbor hopping on the
square lattice at half filling is known to be that of an antiferromagnetic
(AFM) band insulator for any on-site repulsion. At finite temperature, the
absence of long-range order makes the question of how the interaction-driven
insulator is realized nontrivial. We address this problem with controlled
accuracy in the thermodynamic limit using self-energy diagrammatic determinant
Monte Carlo and dynamical cluster approximation methods and show that
development of long-range AFM correlations drives an extended crossover from
Fermi liquid to insulating behavior in the parameter regime that precludes a
metal-to-insulator transition. The intermediate crossover state is best
described as a non-Fermi liquid with a partially gapped Fermi surface.Comment: 6 pages, 4 figures, with supplemental material: 2 pages, 3 figure
Fast high-efficiency integrated waveguide photodetectors using novel hybrid vertical/butt coupling geometry
We report a novel coupling geometry for integrated waveguide photodetectorsâa hybrid vertical coupling/butt coupling scheme that allows the integration of fast, efficient, photodetectors with conventional double heterostructure waveguides. It can be employed to yield a planar, or pseudo-planar, surface that supports further levels of integration. The approach is demonstrated with a 25-”m-long p-i-n detector integrated with an InP/InGaAsP/InP waveguide, which displays a high (~90%) efficiency and large (~15 GHz) bandwidth. This is the fastest high-efficiency integrated waveguide photodetector reported to date
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