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Walcher T.,University of Ulm | Manzke R.,Kiel University of Applied Sciences | Hombach V.,University of Ulm | Rottbauer W.,University of Ulm | And 2 more authors.
Circulation: Cardiovascular Imaging | Year: 2012

Background-Blood oxygen level-dependent (BOLD) cardiac magnetic resonance imaging (CMR) has been shown to be able to detect myocardial perfusion differences. However, validation of BOLD CMR against fractional flow reserve (FFR) is lacking. The aim of our study was to analyze the potential diagnostic accuracy of BOLD CMR in comparison to invasively measured FFR, which served as gold standard for a hemodynamic significant coronary lesion. Methods and Results-BOLD image was performed at rest and during adenosine infusion in a 1.5-T CMR scanner. Thirty-six patients were analyzed for relative BOLD signal intensity increase according to the 16-segment model. Invasive FFR measurements were performed in the 3 major coronary arteries during adenosine infusion in all patients. An FFR?0.8 was regarded to indicate a significant coronary lesion. Relative BOLD signal intensity increase was significantly lower in myocardial segments supplied by coronary arteries with an FFR?0.8 compared with segments with an FFR>0.8 (1.1±0.2 versus 1.5±0.2; P <0.0001). Sensitivity and specificity yielded 88.2% and 89.5%, respectively. Conclusions-CMR BOLD imaging reliably detects hemodynamic significant coronary artery disease and is, thus, an alternative to contrast-enhanced perfusion studies. © 2012 American Heart Association, Inc.

The 360° medium, an immersive dome-based video projection environment (immer-sive dome environment (IDE)) also called 'fulldome', is often seen as an old concept of a traditional planetarium setting. This article invites the reader to look at it as a unique, hybrid media format, which opens new ways of perception. © 2012 Intellect Ltd Miscellaneous. English language.

Es-Souni M.,Kiel University of Applied Sciences | Schopf D.,Kiel University of Applied Sciences
Chemical Communications | Year: 2015

An efficient and easy method is described which allows modification of supported nanocarbon films with carbon nanotubes (CNTs) from an aqueous colloidal suspension. Subsequently CNTs can be decorated with Pt-nanoparticles directly from an aqueous solution of Pt ions without the need for reducing agents. High performance supercapacitors and electrocatalysts are obtained. This journal is © The Royal Society of Chemistry.

Berger N.,Kiel University of Applied Sciences | Es-Souni M.,Kiel University of Applied Sciences
Langmuir | Year: 2016

Large-area ordered nanorod (NR) arrays of various functional materials can be easily and cost-effectively processed using on-substrate anodized porous aluminum oxide (PAO) films as templates. However, reproducibility in the processing of PAO films is still an issue because they are prone to delamination, and control of fabrication parameters such as electrolyte type and concentration and anodizing time is critical for making robust templates and subsequently mechanically reliable NR arrays. In the present work, we systematically investigate the effects of the fabrication parameters on pore base morphology, devise a method to avoid delamination, and control void formation under the barrier layer of PAO films on gold underlayers. Via systematic control of the anodization parameters, particularly the anodization current density and time, we follow the different stages of void development and discuss their formation mechanisms. The practical aspect of this work demonstrates how void size can be controlled and how void formation can be utilized to control the shape of NR bases for improving the mechanical stability of the NRs. © 2016 American Chemical Society.

Luo L.,Kiel University of Applied Sciences | Dietze M.,Kiel University of Applied Sciences | Solterbeck C.-H.,Kiel University of Applied Sciences | Es-Souni M.,Kiel University of Applied Sciences | Luo H.,CAS Shanghai Institute of Ceramics
Applied Physics Letters | Year: 2012

In this letter, the electrocaloric effect (ECE) of 111- and 001-oriented 0.71PbMg 1/3Nb 2/3O 3-0.29PbTiO 3 (0.71PMN-0.29PT) single crystals is investigated with emphasis on the effects of phase transitions and their dependence on electric field. We show that crystal orientation and more specifically the complex phase transitions taking place in the specific composition above have large effects on the maximum ECE temperature, ΔT max, its peak temperature, T EC, and the width of the ECE peak of the δT(T) curve. The investigation shows that ECE may be tuned by a proper choice of 0.71PMN-0.29PT crystal orientations. © 2012 American Institute of Physics.

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