92,107 research outputs found
Optical coherence tomography fast versus regular macular thickness mapping in diabetic retinopathy
No full textObjective: The purpose of the study was to investigate if absolute values and reproducibility of thickness maps obtained from 2 optical coherence tomography (OCT) scanning protocols, regular high-resolution and fast low-density mode, differ in patients with diabetic macular edema. Methods: A total of 26 consecutive patients undergoing fluorescein angiography and Stratus OCT scanning for the evaluation of diabetic macular edema at the Departments of Ophthalmology in Munich and Vienna were included. Results: Retinal thickness of the central field of the thickness map measured by fast retinal thickness protocol was 287 +/- 97 and 290 +/- 113 mu m by the regular protocol. This difference as well as that for all other fields was not statistically significant. Three times repeated measurements applying both OCT scanning modes in 10 patients yielded very good intrasession correlation coefficients between 0.70 and 0.99, with corresponding intrasession standard deviations ranging between 6 and 16 mu m. The fast mode yielded slightly less reproducible values than the regular mode. Visual acuity did not influence the results. Conclusion: In practice both scanning modes caninterchanged and absolute values can be compared directly. Best reproducibility is obtained with higher sampling density even in patients with reduced visual acuity due to diabetic macular edema. Copyright (C) 2008 S. Karger AG, Basel
Kayserlich Allergnädigstes Hof-Decret, An Eine hochlöblich-allgemeine Reichs-Versam[m]lung zu Regenspurg/ Sub Dato Wien d. 4. Septembr. 1747. Die Hertzoglich-Sachsen-Meinungische Recurs- und Successions-Sache betreffend.
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Dr. Glendon Swarthout
No full textHosted by Roger M. Busfield, MSU Assistant Professor of Speech and Theater, Meet the Author is designed to introduce a general audience to a contemporary author and their work through in-depth interviews. This episode features a conversation between Dr. Glendon Swarthout, prolific author and English professor at MSU, and assistant professors Sam S. Baskett and Theodore B. Strandness
The impact of learning theories, education programmes and culture on teaching and learning styles
No full textMertens C, Doleschal R. The impact of learning theories, education programmes and culture on teaching and learning styles. In: Neubauer M, Anuradha NS, Keuchel S, eds. Cross Cultural approaches to learning and studying: A comparative study on Austria, Germany and India . New Delhi: MacMillan; 2007
Concentric left ventricular remodeling and aortic stiffness: a comparison of obesity and hypertension.
No full textBACKGROUND: Increased thoracic ascending aortic stiffness is thought to contribute to concentric left ventricular hypertrophy and increased mortality, a pattern seen in hypertension. As such, aortic stiffness and increased left ventricular mass are candidates by which obesity increases cardiovascular risk. However, obesity is characterized predominantly by increased abdominal aortic stiffness and with eccentric left ventricular hypertrophy. METHODS: We aimed to establish whether or not, in addition to these changes, there is also an element of concentric remodeling in obesity that was predicted by ascending aortic stiffness. 301 subjects underwent cardiovascular magnetic resonance imaging to measure regional aortic distensibility and left ventricular morphology. To compare obesity with hypertension, subjects were separated into groups by hypertensive status and body mass index. RESULTS: In comparison to normotensive subjects, hypertension was linked with concentric remodeling (a 17% increase in left ventricular mass:volume ratio (LVM:VR), (p<0.001)) and reduced ascending aortic distensibility (by 64%,p<0.001). LVM:VR was negatively correlated with ascending aortic distensibility (R=-0.36,p<0.01). Obesity, in the absence of hypertension, was associated with elevated left ventricular mass when compared to normal weight normotensive subjects (by 27%, p<0.01), in an eccentric pattern with cavity dilatation (p<0.01). However, LVM:VR was also 14% larger than in normal weight normotensive subjects (p<0.01), indicative of additional concentric remodeling. LVM:VR in obesity was, however, not correlated with ascending aortic distensibility when adjusted for mean arterial pressure (R=-0.14,p<0.14). CONCLUSION: In summary, despite the predominantly eccentric pattern of left hypertrophy in obesity there is a concentric element of hypertrophy that, unlike in hypertension, is not linked to increased ascending aortic stiffness
Sex-specific associations between alcohol consumption, cardiac morphology, and function as assessed by magnetic resonance imaging: insights form the UK Biobank Population Study
No full textThis is a pre-copyedited, author-produced version of an article accepted for publication in
European Heart Journal - Cardiovascular Imaging following peer review. The version of record: Judit Simon, Kenneth Fung, Márton Kolossváry, Mihir M Sanghvi, Nay Aung, Jose Miguel Paiva, Elena Lukaschuk, Valentina Carapella, Béla Merkely, Marcio S Bittencourt, Júlia Karády, Aaron M Lee, Stefan K Piechnik, Stefan Neubauer, Pál Maurovich-Horvat, Steffen E Petersen, Sex-specific associations between alcohol consumption, cardiac morphology, and function as assessed by magnetic resonance imaging: insights form the UK Biobank Population Study, European Heart Journal - Cardiovascular Imaging, jeaa242, https://doi.org/10.1093/ehjci/jeaa242
is available online at: https://doi.org/10.1093/ehjci/jeaa24
Simulation of thermal plant optimization and hydraulic aspects of thermal distribution loops for large campuses
No full textFollowing an introduction, the author describes Texas A&M University and its utilities system. After that, the author presents how to construct simulation models for chilled water and heating hot water distribution systems. The simulation model was used in a $2.3 million Ross Street chilled water pipe replacement project at Texas A&M University. A second project conducted at the University of Texas at San Antonio was used as an example to demonstrate how to identify and design an optimal distribution system by using a simulation model. The author found that the minor losses of these closed loop thermal distribution systems are significantly higher than potable water distribution systems. In the second part of the report, the author presents the latest development of software called the Plant Optimization Program, which can simulate cogeneration plant operation, estimate its operation cost and provide optimized operation suggestions. The author also developed detailed simulation models for a gas turbine and heat recovery steam generator and identified significant potential savings. Finally, the author also used a steam turbine as an example to present a multi-regression method on constructing simulation models by using basic statistics and optimization algorithms. This report presents a survey of the author??s working experience at the Energy Systems Laboratory (ESL) at Texas A&M University during the period of January 2002 through March 2004. The purpose of the above work was to allow the author to become familiar with the practice of engineering. The result is that the author knows how to complete a project from start to finish and understands how both technical and nontechnical aspects of a project need to be considered in order to ensure a quality deliverable and bring a project to successful completion. This report concludes that the objectives of the internship were successfully accomplished and that the requirements for the degree of Degree of Engineering have been satisfied
Measurement of the mass difference m(D-s(+))-m(D+) at CDF II
No full textWe present a measurement of the mass difference m(D-s(+))-m(D+), where both the D-s(+) and D+ are reconstructed in the phipi(+) decay channel. This measurement uses 11.6 pb(-1) of data collected by CDF II using the new displaced-track trigger. The mass difference is found to be m(D-s(+))-m(D+)=99.41+/-0.38(stat)+/-0.21(syst) MeV/c(2)
Study of (AgxCu1-x)(2)ZnSn(S,Se)(4) monograins synthesized by molten salt method for solar cell applications
No full textThe open circuit voltage (V-OC) deficit of Cu2ZnSn(S,Se)(4) (CZTSSe) kesterite solar cells is higher than that of the closely related Cu(InGa)Se-2 solar cells. One of the most promising strategies to overcome the large V-OC deficit of kesterite solar cells is by reducing the recombination losses through appropriate cation substitution. In fact, replacing totally or partially Zn or Cu by an element with larger covalent radius one can significantly reduce the concentration of I-II antisite defects in the bulk. In this study, an investigation of the impact of partial substitution of Cu by Ag in CZTSSe solid solution monograins is presented. A detailed photoluminescence study is conducted on Ag-incorporated CZTSSe monograins and a radiative recombination model is proposed. The composition and structural quality of the monograins in dependence of the added Ag amount are characterized using Energy Dispersive X-ray Spectroscopy and X-Ray Diffraction method, respectively. The Ag-incorporated CZTSSe monograin solar cells are characterized by temperature dependent current-voltage and electron beam induced current methods. It was found, that low Ag contents (x <= 0.02) in CZTSSe lead to higher solar cell device efficiencies.This work was supported by institutional research funding IUT19-28 of the Estonian Ministry of Education and Research, by the Estonian Research Council grant PSG441 and by the European Union through the European Regional Development Fund, Projects TK141 and MOBJD308
Mixed-mode chromatography characteristics of chiralpak ZWIX(+) and ZWIX(−) and elucidation of their chromatographic orthogonality for LC × LC application
No full textTwo-dimensional liquid chromatography requires orthogonal columns and/or separation principles in the first and second separation dimension. It is sometimes not straightforward to achieve. Chiral columns could expand the toolbox for 2D-LC, but are rarely exploited for this purpose, not least due to missing understanding of retention principles under non-chiral application conditions. To gain more insight, in this study Chiralpak ZWIX(+) and ZWIX(−), based on zwitterionic quinine and quinidine carbamate selectors, were carefully characterized by molecular dynamics simulations, lipophilicity/hydrophilicity measurements of selectors, pH-dependent ζ-potential determinations, and chromatographic characterization in RPLC and HILIC modes combined with unsupervised principal component analysis to extract classification of these columns in comparison to a number of commercial benchmarks (RP, HILIC and mixed-mode columns). The results showed that these chiral columns can be classified as mixed-mode chromatography phases with balanced lipophilic-hydrophilic surface character, excess of negative net charge due to sulfonic acid groups (in spite of weakly basic quinuclidine and quinoline rings), and multimodal applicability (RP, HILIC and polar organic elution modes). Orthogonality mapping in comparison to a number of modern HILIC and mixed-mode columns revealed that Poroshell HILIC-Z (with a zwitterionic ligand on 2.7 μm core-shell particles) can be beneficially combined as second dimension with the ZWIX column for comprehensive LC × LC. The online hyphenation of this 2D-LC system with complementary detection modalities including UV (DAD for chromophoric substances), charged aerosol detection (for universal detection and calibration of non-volatile analytes) and high-resolution mass spectrometry (ESI-QTOF-MS/MS for identification) provided an advanced method for comprehensive impurity profiling, applicable for instance for amino acid pharmaceutical products
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