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  1. Article ; Online: Radiographic complicated and uncomplicated descending aortic dissections: aortic morphological differences by CT angiography and risk factor analysis.

    Berger, Tim / Maier, Annika / Kletzer, Joseph / Schlett, Christopher L / Kondov, Stoyan / Czerny, Martin / Rylski, Bartosz / Kreibich, Maximilian

    European heart journal. Cardiovascular Imaging

    2024  

    Abstract: Objective: To identify radiographic differences between patients with uncomplicated and complicated descending aortic dissections.: Methods: Between 04/2009 and 07/2021, 209 patients with acute descending aortic dissections were analyzed as ... ...

    Abstract Objective: To identify radiographic differences between patients with uncomplicated and complicated descending aortic dissections.
    Methods: Between 04/2009 and 07/2021, 209 patients with acute descending aortic dissections were analyzed as complicated (malperfusion, rupture, diameter progress, and diameter ≥55mm) or uncomplicated. Detailed CTA measurements (slice thickness ≤ 3mm) were taken in multiplanar reconstruction. A composite endpoint (early aortic failure) was defined as reoperation, diameter progression, and early mortality.
    Results: Seventy-seven patients were female (36.8%) (complicated n=27 (36.5%); uncomplicated n=50 (37.0%) p=1.00). Seventy-four (35%) patients were categorized as morphologically complicated, and 135 (65%) as uncomplicated. In patients with complicated dissections, the dissection extended more frequently to the aortic bifurcation (p=0.044), the coeliac trunk (p=0.003), the superior mesenteric artery (p=0.007), and both iliac arteries (p<0.001) originated less frequently from the true lumen. The length of the most proximal communication (entry) in type B aortic dissection was longer, 14.0mm [12.0mm; 27.0mm] vs 6.0mm [4,0mm; 13.0mm] in complicated cases (p=0.005). Identified risk factors for adverse aortic events were connective tissue disease (HR 8.0 (1.9 - 33.7 95%CI HR)) length of the aortic arch (HR 4.7 (1.5 - 15.1 95%CI HR)) a false lumen diameter >19.38mm (HR 3.389 (1.1-10.2 95%CI HR) and origin of the inferior mesenteric artery from the false lumen (HR 4.2 (1.0 - 5.5 95%CI HR)).
    Conclusions: We identified significant morphological differences and predictors for adverse events in patients presenting complicated and uncomplicated descending dissections. Our morphological findings will help guide future aortic therapies, taking a tailored patient approach.
    Language English
    Publishing date 2024-01-25
    Publishing country England
    Document type Journal Article
    ZDB-ID 2638345-7
    ISSN 2047-2412 ; 2047-2404
    ISSN (online) 2047-2412
    ISSN 2047-2404
    DOI 10.1093/ehjci/jeae030
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Solubilisation of Ni(II) and Eu(III) through complexation with a polyaryl ether based superplasticizer in alkaline media

    Chernyshev, Alexander N / Maier, Annika C / Jonsson, Mats / Forsberg, Kerstin

    Chemosphere. 2021 Jan., v. 263

    2021  

    Abstract: Solubilisation of Ni(II) and Eu(III) by complexation with a polyaryl ether based superplasticizer (PAE SP) in alkaline solutions was studied. The solubilisation was investigated in two types of artificial cement pore waters simulating different stages of ...

    Abstract Solubilisation of Ni(II) and Eu(III) by complexation with a polyaryl ether based superplasticizer (PAE SP) in alkaline solutions was studied. The solubilisation was investigated in two types of artificial cement pore waters simulating different stages of cement degradation at a pH of 12.4 and 13.3, respectively. The solubility of Ni(II) and Eu(III) increased as the concentration of superplasticizer was increased from 0.04 to 0.4 wt%. When the concentration of SP was increased from 0.4 to 4%, the solubility of Eu(III) and Ni(II) increased in the pore water with a pH of 12.4, while the concentrations decreased in the pore water with a pH of 13.3. This is explained by a more rapid degradation of the superplasticizer at higher pH leading to a release of phosphate groups and thereby precipitation of Eu(III) and Ni(II) as phosphates. Based on results of the solubilisation of Ni(II) and Eu(III) by model compounds (anisole and PEG 400) and ³¹P NMR spectroscopy it was confirmed that the complexation of the studied metals with the PAE polymer occurs via the phosphate group of the superplasticizer.
    Keywords cement ; degradation ; metals ; models ; nuclear magnetic resonance spectroscopy ; pH ; phosphates ; polymers ; solubility ; solubilization ; solutions ; water
    Language English
    Dates of publication 2021-01
    Publishing place Elsevier Ltd
    Document type Article
    Note NAL-light
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127686
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Solubilisation of Ni(II) and Eu(III) through complexation with a polyaryl ether based superplasticizer in alkaline media.

    Chernyshev, Alexander N / Maier, Annika C / Jonsson, Mats / Forsberg, Kerstin

    Chemosphere

    2020  Volume 263, Page(s) 127686

    Abstract: Solubilisation of Ni(II) and Eu(III) by complexation with a polyaryl ether based superplasticizer (PAE SP) in alkaline solutions was studied. The solubilisation was investigated in two types of artificial cement pore waters simulating different stages of ...

    Abstract Solubilisation of Ni(II) and Eu(III) by complexation with a polyaryl ether based superplasticizer (PAE SP) in alkaline solutions was studied. The solubilisation was investigated in two types of artificial cement pore waters simulating different stages of cement degradation at a pH of 12.4 and 13.3, respectively. The solubility of Ni(II) and Eu(III) increased as the concentration of superplasticizer was increased from 0.04 to 0.4 wt%. When the concentration of SP was increased from 0.4 to 4%, the solubility of Eu(III) and Ni(II) increased in the pore water with a pH of 12.4, while the concentrations decreased in the pore water with a pH of 13.3. This is explained by a more rapid degradation of the superplasticizer at higher pH leading to a release of phosphate groups and thereby precipitation of Eu(III) and Ni(II) as phosphates. Based on results of the solubilisation of Ni(II) and Eu(III) by model compounds (anisole and PEG 400) and
    MeSH term(s) Ether ; Hydrogen-Ion Concentration ; Metals ; Phosphates ; Solubility
    Chemical Substances Metals ; Phosphates ; Ether (0F5N573A2Y)
    Language English
    Publishing date 2020-07-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2020.127686
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2540: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
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    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  4. Article ; Online: On the change in UO

    Maier, Annika Carolin / Kegler, Philip / Klinkenberg, Martina / Baena, Angela / Finkeldei, Sarah / Brandt, Felix / Jonsson, Mats

    Dalton transactions (Cambridge, England : 2003)

    2020  Volume 49, Issue 4, Page(s) 1241–1248

    Abstract: To assess the long-term leaching behaviour of ... ...

    Abstract To assess the long-term leaching behaviour of UO
    Language English
    Publishing date 2020-01-06
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472887-4
    ISSN 1477-9234 ; 1364-5447 ; 0300-9246 ; 1477-9226
    ISSN (online) 1477-9234 ; 1364-5447
    ISSN 0300-9246 ; 1477-9226
    DOI 10.1039/c9dt04395k
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  5. Article ; Online: Exodex Adam-A Reconfigurable Dexterous Haptic User Interface for the Whole Hand.

    Lii, Neal Y / Pereira, Aaron / Dietl, Julian / Stillfried, Georg / Schmidt, Annika / Beik-Mohammadi, Hadi / Baker, Thomas / Maier, Annika / Pleintinger, Benedikt / Chen, Zhaopeng / Elawad, Amal / Mentzer, Lauren / Pineault, Austin / Reisich, Philipp / Albu-Schäffer, Alin

    Frontiers in robotics and AI

    2022  Volume 8, Page(s) 716598

    Abstract: Applications for dexterous robot teleoperation and immersive virtual reality are growing. Haptic user input devices need to allow the user to intuitively command and seamlessly "feel" the environment they work in, whether virtual or a remote site through ...

    Abstract Applications for dexterous robot teleoperation and immersive virtual reality are growing. Haptic user input devices need to allow the user to intuitively command and seamlessly "feel" the environment they work in, whether virtual or a remote site through an avatar. We introduce the DLR Exodex Adam, a reconfigurable, dexterous, whole-hand haptic input device. The device comprises multiple modular, three degrees of freedom (3-DOF) robotic fingers, whose placement on the device can be adjusted to optimize manipulability for different user hand sizes. Additionally, the device is mounted on a 7-DOF robot arm to increase the user's workspace. Exodex Adam uses a front-facing interface, with robotic fingers coupled to two of the user's fingertips, the thumb, and two points on the palm. Including the palm, as opposed to only the fingertips as is common in existing devices, enables accurate tracking of the whole hand without additional sensors such as a data glove or motion capture. By providing "whole-hand" interaction with omnidirectional force-feedback at the attachment points, we enable the user to experience the environment with the complete hand instead of only the fingertips, thus realizing deeper immersion. Interaction using Exodex Adam can range from palpation of objects and surfaces to manipulation using both power and precision grasps, all while receiving haptic feedback. This article details the concept and design of the Exodex Adam, as well as use cases where it is deployed with different command modalities. These include mixed-media interaction in a virtual environment, gesture-based telemanipulation, and robotic hand-arm teleoperation using adaptive model-mediated teleoperation. Finally, we share the insights gained during our development process and use case deployments.
    Language English
    Publishing date 2022-03-03
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2781824-X
    ISSN 2296-9144 ; 2296-9144
    ISSN (online) 2296-9144
    ISSN 2296-9144
    DOI 10.3389/frobt.2021.716598
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: Low-Temperature Reducibility of MxCe1–xO2 (M = Zr, Hf) under Hydrogen Atmosphere

    Bonk, Alexander / Remhof Arndt / Maier Annika C / Trottmann Matthias / Schlupp Meike V. F / Battaglia Corsin / Vogt Ulrich F

    The Journal of Physical Chemistry C. 2016 Jan. 14, v. 120, no. 1

    2016  

    Abstract: Redox cycles utilize the reversible oxygen release/uptake of cerium oxide in a variety of renewable energy applications such as fuel cells, water gas shift reactions, and solar thermochemical fuel production. For all applications the degree of reduction/ ... ...

    Abstract Redox cycles utilize the reversible oxygen release/uptake of cerium oxide in a variety of renewable energy applications such as fuel cells, water gas shift reactions, and solar thermochemical fuel production. For all applications the degree of reduction/oxidation determines the overall performance. In this study we report on the redox behavior of MₓCe₁–ₓO₂₋δ (M = Zr, Hf; x = 0, 0.15, 0.2) solid solutions monitored by high-temperature in situ X-ray diffraction. During reduction in H₂ at 600 °C and the successive formation of Ce³⁺ and oxygen vacancies, the lattice of ceria expands up to 0.3%. The lattice expansion of hafnium-doped ceria samples is 4 times larger than in zirconium-doped or undoped ceria, indicating drastically higher extents of oxygen vacancy formation. The same trends are validated using temperature-programmed reduction measurements. Complete reoxidation of the MₓCe₁–ₓO₂₋δ solid solutions in air at 600 °C is reflecting the reversibility of the redox process. Scanning electron microscopy and X-ray diffraction analysis before and after redox cycling indicate phase and microstructural stability of all compositions during reduction.
    Keywords X-ray diffraction ; air ; ceric oxide ; fuel cells ; fuel production ; hydrogen ; oxidation ; oxygen ; physical chemistry ; renewable energy sources ; scanning electron microscopy ; solid solutions ; zirconium
    Language English
    Dates of publication 2016-0114
    Size p. 118-125.
    Publishing place American Chemical Society
    Document type Article
    ISSN 1932-7455
    DOI 10.1021%2Facs.jpcc.5b10796
    Database NAL-Catalogue (AGRICOLA)

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