2,463 research outputs found
Spring 2021 HIP with a virtual literature review experience with an RN-BSN Student
No full textRegistered Nurse-Bachelor of Science in Nursing (RN-BSN) students have been caring for critically ill COVID-19 patients for over a year, while remaining dedicated to advancing their education. Nurse burnout has increased with the COVID-19 stressors adding to the critical nursing shortages throughout the nation (Kelly et al., 2021). Caring mentorship supports the RN-BSN student needs as a working nurse enduring pandemic stressors
Interobserver variability of optic disk variables measured by confocal scanning laser tomography.
No full textPURPOSE: To assess the interobserver variation of confocal laser scanning tomographic measurements of the optic nerve head and to address the question of whether the addition of clinical optic disk photographs is helpful in outlining the optic disk margin and in reducing the observer-related variation of the measurements. PATIENTS AND METHODS: Optic disk variables for 16 eyes of 16 patients with glaucoma, generated by confocal laser scanning laser tomography (Heidelberg Retina Tomograph), were independently evaluated by four experienced glaucoma specialists, and the interobserver variability was calculated. A second separate review by the same observers included the use of clinical stereoscopic color optic nerve head photographs to aid definition of the optic disk margin. RESULTS: Optic disk parameters with the smallest interobserver variation were cup shape measure, maximum cup depth, height variation contour, and mean height contour. The intraobserver variation of these parameters did not increase when clinical optic disk slides were additionally available. Parameters with the highest interobserver variation were volume below surface, volume below reference, volume above surface, and volume above reference. The observer variation of these optic disk parameters increased significantly for two of the four examiners when clinical optic disk slides were additionally available for outlining the optic disk margin. CONCLUSION: Confocal laser scanning tomography of the optic nerve head can be improved significantly if clinical optic disk photographs are additionally available to help in outlining the optic disk margin. Because interobserver variation in the tomographic optic disk measurements can be significant, even if experienced observer are involved, tomographic optic disk measurements may be centralized in reading centers in the case of multicenter studies. Copyright © 2001 Elsevier Science Inc
How-to guides for first time staff RN researchers, from staff RN researcher, published author
No full textAdvice and tips from a first time bedside staff RN researcher/ published author to potential staff RN researchers/ authors on how to start, fund, form teams, gather and analyze data, submit completed research project for conferences and publication
Bolfuncties in Rn: Spherical harmonics in Rn
No full textIn de wiskunde hebben we bij het modelleren van fysische problemen vaak te maken met randwaardeproblemen. Voor een randwaardeprobleem met een cirkel als rand en een L2- functie als randvoorwaarde, kan deze randvoorwaarde beschreven worden door een Fourierreeks. Hierdoor kan zo'n randwaardeprobleem makkelijker opgelost worden. In dit werk wordt het uitdrukken van functies in Fourierreeksen in R2 uitgebreid naar Rn door bolfuncties in Rn te gebruiken. Eerst wordt er een introductie gegeven in bolfuncties in R2 en er wordt een aantal nuttige eigenschappen van deze functies besproken. Vervolgens worden enkele handigheden voor het werken in Rn genoemd en komen de kwadratisch integreerbare functies aan bod. Tot slot zien we dat de eigenschappen van de bolfuncties in R2 nog steeds gelden in Rn en dat elke kwadratisch integreerbare functie op de eenheidssfeer te schrijven is als lineaire combinatie van bolfuncties.Electrical Engineering, Mathematics and Computer ScienceDelft Institute of Applied Mathematic
Strategies for improving early detection of glaucoma: the combined structure–function index
No full textAndrew J Tatham, Robert N Weinreb, Felipe A MedeirosHamilton Glaucoma Center, Department of Ophthalmology, University of California, La Jolla, CA, USAAbstract: The early detection of glaucoma is important in order to enable appropriate monitoring and treatment, and to minimize the risk of irreversible visual field loss. Although advances in ocular imaging offer the potential for earlier diagnosis, the best method is likely to involve a combination of information from structural and functional tests. Recent studies have shown it is possible to estimate the number of retinal ganglion cells from optical coherence tomography and standard automated perimetry, and to then pool the results to produce a combined structure–function index (CSFI). The CSFI represents the estimated percentage of retinal ganglion cells lost compared to an age-matched healthy eye. Previous studies have suggested that the CSFI is better able to detect glaucoma than isolated measures of structure and function, and that it performs well even in preperimetric glaucoma. The purpose of this review is to describe new strategies, such as the CSFI, that have the potential to improve the early detection of glaucoma. We also describe how our ability to detect early glaucoma may be further enhanced by incorporating demographic risk factors, clinical examination findings, and imaging and functional test results into intuitive models that provide estimates of disease probability.Keywords: glaucoma, optical coherence tomography, OCT, perimetry, spectral domain, retinal ganglion cell
Approximation and interpolation by large entire cross-sections of second category sets in Rn+1
No full textIn [M.R. Burke, Large entire cross-sections of second category sets in Rn+1Rn+1, Topology Appl. 154 (2007) 215–240], a model was constructed in which for any everywhere second category set A⊆Rn+1A⊆Rn+1 there is an entire function f:Rn→Rf:Rn→R which cuts a large section through A in the sense that {x∈Rn:(x,f(x))∈A}{x∈Rn:(x,f(x))∈A} is everywhere second category in RnRn. Moreover, the function f can be taken so that its derivatives uniformly approximate those of a given CNCN function g in the sense of a theorem of Hoischen. In the theory of the approximation of CNCN functions by entire functions, it is often possible to insist that the entire function interpolates the restriction of the CNCN function to a closed discrete set. In the present paper, we show how to incorporate a closed discrete interpolation set into the above mentioned theorem. When the set being sectioned is sufficiently definable, an absoluteness argument yields a strengthening of the Hoischen theorem in ZFC. We get in particular the following: Suppose g:Rn→Rg:Rn→R is a CNCN function, ε:Rn→Rε:Rn→R is a positive continuous function, T⊆RnT⊆Rn is a closed discrete set, and G⊆Rn+1G⊆Rn+1 is a dense GδGδ set. Let A⊆RnA⊆Rn be a countable dense set disjoint from T and for each x∈Ax∈A, let Bx⊆RBx⊆R be a countable dense set. Then there is a function f:Rn→Rf:Rn→R which is the restriction of an entire function Cn→CCn→C such that the following properties hold. (a) For all multi-indices α of order at most N and all x∈Rnx∈Rn, |(Dαf)(x)−(Dαg)(x)|<ε(x)|(Dαf)(x)−(Dαg)(x)|<ε(x), and moreover (Dαf)(x)=(Dαg)(x)(Dαf)(x)=(Dαg)(x) when x∈Tx∈T. (b) For each x∈Ax∈A, f(x)∈Bxf(x)∈Bx. (c) {x∈Rn:(x,f(x))∈G}{x∈Rn:(x,f(x))∈G} is a dense GδGδ set in RnRn
Anterior Chamber Angle Assessment Techniques: A Review
No full textAssessment of the anterior chamber angle (ACA) is an essential part of the ophthalmological examination. It is intrinsically related to the diagnosis and treatment of glaucoma and has a role in its prevention. Although slit-lamp gonioscopy is considered the gold-standard technique for ACA evaluation, its poor reproducibility and the long learning curve are well-known shortcomings. Several new imaging techniques for angle evaluation have been developed in the recent years. However, whether these instruments may replace or not gonioscopy in everyday clinical practice remains unclear. This review summarizes the last findings in ACA evaluation, focusing on new instruments and their application to the clinical practice. Special attention will be given to the comparison between these new techniques and traditional slit-lamp gonioscopy. Whereas ultrasound biomicroscopy and anterior segment optical coherence tomography provide quantitative measurements of the anterior segment's structures, new gonio-photographic systems allow for a qualitative assessment of angle findings, similarly to gonioscopy. Recently developed deep learning algorithms provide an automated classification of angle images, aiding physicians in taking faster and more efficient decisions. Despite new imaging techniques made analysis of the ACA more objective and practical, the ideal method for ACA evaluation has still to be determined
Soil radon (Rn-222) monitoring in a forest site in Fukushima, Japan
No full textSoil radon (Rn-222) has been monitored since August 2013 at three different soil depths on a campus forest of Fukushima University in Japan, where a large amount of fallout nuclides were released by the accident of Fukushima Daiichi Nuclear Power Plant in March 2011. The primary purpose of this study is to evaluate Rn-222 activity level, variability and factors controlling Rn-222 concentration in soil air using data obtained from August to December 2013. Time series of Rn-222 activity concentration showed depth-dependent variability with an equilibrium value (Rn-222(eq)) during this observation period; 7.5, 14 and 23 kBq m(-3) at 0.3, 0.6 and 1.0 m in depth, respectively. Two typhoons passing over the site had a great influence on soil radon level, which was practically used for evaluating effective diffusion coefficient of Rn-222. Transport mechanism of Rn-222 in soil air was considered to be diffusion-controlled with data sets on changing Rn-222 concentration with time in selected cases that showed decreasing (or increasing) Rn-222 concentration with time at every depth. Important factors affecting soil Rn-222 variability are meteorological parameters, low-pressure front passing over the site, and subsequent precipitation. Time lags of decreasing Rn-222 concentration at different depths after rain indicate a certain relationship of Rn-222 level with moving water (and water vapor) in soil. The findings obtained in this study are important to evaluate the fate of fallout nuclides (radiocesium) in contaminated forest sites using soil radon as a tracer of moving soil air
NCLEX-RN Alternate-Format Q&A
No full textBe prepared for the alternate-item format questions in the new, 2010 NCLEX-RN® Test Plan.
This portable guide by Kathleen A. Ohman, author of the best-selling Davis’s Q&A for the NCLEX-RN® Examination, offers the practice you need to sit for the exam with confidence.
You’ll find more than 450 alternate-item format questions—including the new audio, graphic, and video questions that are featured on the exam.https://digitalcommons.csbsju.edu/nursing_books/1000/thumbnail.jp
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