1,113 research outputs found

    Quantum cascade lasers in biomedical infrared imaging

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    Technological advances, namely the integration of quantum cascade lasers (QCLs) within an infrared (IR) microscope, are enabling the development of valuable label-free biomedical-imaging tools capable of targeting and detecting salient chemical species within practical clinical timeframes

    College Students’ Attitudes, Stigma, and Intentions Toward Seeking Online and Face-to-Face Counseling

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    Objective(s): To investigate differences in public stigma, self-stigma, attitudes (value and discomfort), and intentions to seek help between online and face-to-face counseling. To identify a difference in the relationship between these variables and both counseling modalities. Method: An online survey completed by 538 college students from one university in the Southeastern United States. The sample included 412 females and 126 males with a mean age of 20.21 years (SD = 1.26). Results: Significantly higher levels of self-stigma and discomfort toward online counseling were reported. Significantly higher value and intentions were reported toward face-to-face counseling. Self-stigma was positively related to public stigma, value was negatively related to self-stigma, and intentions toward seeking help was positively related to value. Conclusions: Results suggest face-to-face counseling is seen as a more favorable method of service delivery compared to online counseling. Value toward online counseling is an important predictor for seeking this type of help

    Caledonian and Pre-Caledonian orogenic events in Shetland, Scotland:evidence from garnet Lu-Hf and Sm-Nd geochronology

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    Garnet Lu-Hf and Sm-Nd ages from the Shetland Caledonides provide evidence of a pollorogenic history as follows: 1) c. 1050 Ma Grenvillian reworking of Neoarchaean basement; 2) c. 910 Ma Renlandian metamorphism of the Westing Group; 3) c. 622-606 Ma metamorphism of the Walls Metamorphic Series but of uncertain significance because the eastern margin of Laurentia is thought to have been in extension at that time; 4) Grampian I ophiolite obduction at c. 491 Ma followed by crustal thickening and metamorphism between c. 485 and c. 466 Ma; 5) Grampian II metamorphism between c. 458 and c. 442 Ma that appears to have been focused in areas here pre-existing foliations ere gentle-inclined and thus may have been relatively easily reworked; 6) Scandian metamorphism at c. 430 Ma, although the paucity of these ages suggests that much of Shetland did not attain temperatures for garnet growth. There is no significant difference in the timing of Caledonian orogenic events either side of the Walls Boundary Fault, although this need not preclude linkage with the Great Glen Fault. However, the incompatibility of Ediacaran events either side of the Walls Boundary Fault may indicate significant lateral displacement and requires further investigation

    Lift Force Analysis for an Electrodynamic Wheel Maglev Vehicle

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    This paper used an analytic based 3-D second order vector potential model to study the vertical dynamic force ripple and dynamic airgap height change when using a one pole-pair electrodynamic wheel (EDW) maglev vehicle. A one-pole pair EDW creates the lowest lift specific power; however transient finite element analysis (FEA) also shows that the one pole-pair EDW will create a large oscillating vertical force when maintaining a static airgap height. A dynamically coupled eddy current model was used to confirm that when the airgap length is allowed to change with time then an increase in vertical airgap creates a large decrease in lift force thereby mitigating any large oscillatory airgap height changes from being created by the one pole-pair EDW. The small airgap height variation was experimentally confirmed by using a four-wheeled proof-of-principle radial EDW maglev vehicle

    Effects of habitat transformation on temporary wetlands in the South-Western Cape, South Africa

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    Includes bibliographical references.The widespread loss of temporary wetlands to human activities has been well established, but virtually no information exists on how the human transformation of landscapes has altered the ecological character of those wetlands that remain. This thesis investigates environmental conditions and invertebrate assemblages in temporary wetlands in relation to the extent of habitat transformation in the adjacent landscape, using a broad (across multiple landscapes) and a fine (within-landscape) scale of analysis
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