Erasable holographic medium using cis-trans isomerization

Photochemical process has been developed for recording of erasable holograms by utilizing reversible transformation of two isomers of molecule upon exposure to light. Hologram system records, reads, and erases in response to changes in refractive index of mixture of isomers

Thrombolysis is associated with consistent functional improvement across baseline stroke severity: a comparison of outcomes in patients from the Virtual International Stroke Trials Archive (VISTA)

<p><b>Background and Purpose:</b> Baseline stroke severity predicts outcomes among thrombolysed patients. The baseline National Institutes of Health Stroke Scale (NIHSS) thresholds are sometimes used to select patients for thrombolysis, clinical trial enrollment, or both. Using data lodged with Virtual International Stroke Trials Archive, we compared adjusted outcomes between thrombolysed and nonthrombolysed patients enrolled in neuroprotection trials (1998-2007) to assess the influence of various levels of baseline NIHSS.</p> <p><b>Method:</b> We assessed the association of treatment with outcome, measured across the modified Rankin scale score distribution, in patients categorized by baseline NIHSS in increments of 4. We used an age and baseline NIHSS adjusted Cochran-Mantel-Haenszel test followed by proportional odds logistic regression analysis. We report the Cochran-Mantel-Haenszel P values and estimated odds ratios (OR) for improved modified Rankin scale score distribution with treatment for patients within each baseline NIHSS category.</p> <p><b>Results:</b> Data were available for 5817 patients (1585 thrombolysed and 4232 nonthrombolysed). Baseline severity was greater among thrombolysed than nonthrombolysed (median baseline NIHSS, 14 vs 13; P<0.05). An association of treatment with outcome was seen independently and was of similar magnitude within each of the baseline NIHSS categories 5 to 8 (P=0.04; OR, 1.25; 95% confidence interval [CI], 1.0-1.6; N=278/934 thrombolysed/nonthrombolysed), 9 to 12 (P=0.01; OR, 1.3; 95% CI, 1.1-1.6; N=404/942), 13 to 16 (P<0.05; OR, 1.6; 95% CI, 1.3-2.1; N=342/814), 17 to 20 (P<0.05; OR, 1.7; 95% CI, 1.3-2.1; N=311/736), and 21 to 24 (P<0.05; OR, 1.6; 95% CI, 1.1-2.1; N=178/466). No association was observed within baseline NIHSS categories 1 to 4 (P=0.8; OR, 1.1; 95% CI, 0.3-4.4; N=8/161) or >= 25 (P=0.08; OR, 1.1; 95% CI, 0.7-1.9; N=64/179).</p> <p><b>Conclusions:</b> In this nonrandomized comparison, outcomes after thrombolysis were significantly better than in untreated comparators across baseline NIHSS 5 to 24. The significant association was lost only at extremes of baseline NIHSS when sample sizes were small and confidence limits were wide.</p&gt

Snow Skates for Billy: A Regional Book for Primary Grades

It was the purpose of this study to create a book with a local setting that might bridge the gap between text book reading and actual reading of library books. (Many young children enjoy library books chiefly as picture books and rely on adults to read the story to them.

DevOps Didactic Transposition in IS Higher Education: A Systematic Literature Review

Information System (IS) higher education is often challenged by declining students’ academic performance and motivation. An alternative might be project-based learning (PjBL), due to its benefits for students, such as increased motivation. However, PjBL often focuses on the development phases and therefore lacks an operational vision. Against this drawback, DevOps might be seen as an advance of PjBL, arguing for a balance between the development and operational phases. Therefore, in this paper, we conducted a systematic literature review (SLR) to answer this question: What are the students’ results when DevOps is applied to the IS teaching context? We collected 339 papers and selected 22 post-filtering. The two SLR main results were: i) DevOps emerged recently in IS education; ii) DevOps is highly related to PjBL; iii) DevOps benefited students’ carrier development, scaffolds students’ grades, and communication. The main contributions of this research are: to describe the state-of-art of DevOps in IS education; to provide a theoretical foundation for IS didactic transposition from IS Industry; to detail the students’ results when utilizing DevOps is applied to the IS teaching context

On the interplay between vortices and harmonic flows: Hodge decomposition of Euler's equations in 2d

Let $\Sigma$ be a compact manifold without boundary whose first homology is nontrivial. Hodge decomposition of the incompressible Euler's equation in terms of 1-forms yields a coupled PDE-ODE system. The $L^2$-orthogonal components are a `pure' vorticity flow and a potential flow (harmonic, with the dimension of the homology). In this paper we focus on $N$ point vortices on a compact Riemann surface without boundary of genus $g$, with a metric chosen in the conformal class. The phase space has finite dimension $2N+ 2g$. We compute a surface of section for the motion of a single vortex ($N=1$) on a torus ($g=1$) with a non-flat metric, that shows typical features of non-integrable 2-dof Hamiltonians. In contradistinction, for flat tori the harmonic part is constant. Next, we turn to hyperbolic surfaces ($g \geq 2$), having constant curvature -1, with discrete symmetries. Fixed points of involutions yield vortex crystals in the Poincar\'e disk. Finally we consider multiply connected planar domains. The image method due to Green and Thomson is viewed in the Schottky double. The Kirchhoff-Routh hamiltonian given in C.C. Lin's celebrated theorem is recovered by Marsden-Weinstein reduction from $2N+2g$ to $2N$. The relation between the electrostatic Green function and the hydrodynamical Green function is clarified. A number of questions are suggested