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  1. Book ; Thesis: Vergleich eines intravaskulären Kühlsystems mit einer Speiseröhrenkühlsonde zum zielgerichteten Temperaturmanagement im experimentellen Schweinemodell

    Schroeder, Daniel Carl Horst / Herff, Holger / Mader, Navid

    2020  

    Institution Universitätsklinikum Köln / Klinik für Anästhesiologie und Operative Intensivmedizin
    Author's details vorgelegt von Daniel Carl Horst Schroeder ; 1. Gutachter: Privatdozent Dr. med. H. Herff, 2. Gutachter: Professor Dr. med. N. Mader ; aus der Klinik für Anästhesiologie und Operative Intensivmedizin der Universität zu Köln
    Subject code 610
    Language German
    Size 86 Seiten, Diagramme
    Publishing place Köln
    Publishing country Germany
    Document type Book ; Thesis
    Thesis / German Habilitation thesis Dissertation, Universität zu Köln, 2020
    HBZ-ID HT020671356
    Database Catalogue ZB MED Medicine, Health

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    Shelf markLoan statusLocation
    2020 D 969 order for loan Magazin

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  2. Article ; Online: Promoting effect exerted by WOx on Pt/ZrO2 catalysts during NOx reduction using H2 in the excess of O2

    Eßer, Enno / Schröder, Daniel / Kureti, Sven

    Journal of Catalysis. 2023 July, v. 423 p.129-144

    2023  

    Abstract: This work addresses the reduction of NOₓ by H₂ under O₂-rich conditions below 200 °C using Pt/W/ZrO₂ catalysts with tungsten loadings from 0 to 14 wt%. Samples were thoroughly characterized by N₂ physisorption, temperature-programmed desorption of CO, X- ... ...

    Abstract This work addresses the reduction of NOₓ by H₂ under O₂-rich conditions below 200 °C using Pt/W/ZrO₂ catalysts with tungsten loadings from 0 to 14 wt%. Samples were thoroughly characterized by N₂ physisorption, temperature-programmed desorption of CO, X-ray diffraction, laser Raman spectroscopy and diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) with CO as probe molecule. Catalytic investigations showed the highest efficiency for the sample with 5 wt% W providing NOₓ conversion of 94 % and N₂O selectivity of 15 %. The effect of W promoter is mostly attributed to structural promotion by isolated WO₆ entities stabilizing the ZrO₂ surface and leading to a high number of active Pt sites. By contrast, negligible electronic interaction between the promoter and Pt sites appears. Moreover, DRIFTS studies suggest that, in addition to the predominate NOₓ reduction by H₂ on Pt sites, a side reaction occurs including NHₓ species formed at the interface of Pt and WOₓ/ZrO₂.
    Keywords Fourier transform infrared spectroscopy ; Raman spectroscopy ; X-ray diffraction ; catalytic activity ; desorption ; tungsten ; NOx reduction ; H2 reductant ; NH3 formation ; Pt catalyst ; ZrO2 support ; WOx promoter
    Language English
    Dates of publication 2023-07
    Size p. 129-144.
    Publishing place Elsevier Inc.
    Document type Article ; Online
    ZDB-ID 1468993-5
    ISSN 1090-2694 ; 0021-9517
    ISSN (online) 1090-2694
    ISSN 0021-9517
    DOI 10.1016/j.jcat.2023.04.018
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Predicting the Topological and Transport Properties in Porous Transport Layers for Water Electrolyzers.

    Liu, Jiang / Kerner, Felix / Schlüter, Nicolas / Schröder, Daniel

    ACS applied materials & interfaces

    2023  Volume 15, Issue 46, Page(s) 54129–54142

    Abstract: The porous transport layer (PTL) in polymer electrolyte membrane (PEM) electrolyzers governs the overall efficiency. Its structural, thermal, and electronic properties determine how effortlessly the gases can be produced and can exit the PEM electrolyzer. ...

    Abstract The porous transport layer (PTL) in polymer electrolyte membrane (PEM) electrolyzers governs the overall efficiency. Its structural, thermal, and electronic properties determine how effortlessly the gases can be produced and can exit the PEM electrolyzer. In this study, we apply a stochastic reconstruction method for titanium felt-based PTLs to generate PTLs with different porosity, fiber radii, and anisotropy parameters. The morphology and topology of these PTLs are numerically characterized, and transport properties, such as gas diffusion coefficients and electrical and thermal conductivity, are computed via pore-scale modeling. Customized graded PTLs are proposed, exhibiting the optimal topology and bulk structure for the removal of gases, the conductance of electrons, and the transport of heat. The results indicate that the surface and transport properties of PTLs can be tailored by certain morphology parameters: PTLs with lower porosity and smaller fiber radii feature a more sufficient interfacial contact and superior electrical and thermal conductivity. Lowering the anisotropy parameters of PTLs results in a slight loss of interfacial contact but a substantial increase in the electrical and thermal conductivity in the through-plane direction. We outline that the design of PTLs should be differentiated depending on the operating conditions of electrolyzers. For nonstarvation conditions, PTLs should feature low porosity and small fiber radii, whereas for starvation conditions, PTLs should feature high porosity, low anisotropy parameters, and small fiber radii. Furthermore, graded PTLs with enhanced structural and transport properties can be developed by customizing the porosity, fiber radius, and fiber orientation.
    Language English
    Publishing date 2023-11-10
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c12345
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Implementation of Different Conversion/Alloy Active Materials as Anodes for Lithium-Based Solid-State Batteries.

    Kreissl, Julian J A / Dang, Hoang Anh / Mogwitz, Boris / Rohnke, Marcus / Schröder, Daniel / Janek, Jürgen

    ACS applied materials & interfaces

    2024  

    Abstract: To complement or outperform lithium-ion batteries with liquid electrolyte as energy storage devices, a high-energy as well as high-power anode material must be used in solid-state batteries. An overlooked class of anode materials is the one of conversion/ ...

    Abstract To complement or outperform lithium-ion batteries with liquid electrolyte as energy storage devices, a high-energy as well as high-power anode material must be used in solid-state batteries. An overlooked class of anode materials is the one of conversion/alloy active materials (e.g., SnO
    Language English
    Publishing date 2024-05-09
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.4c03058
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Benchmarking organic active materials for aqueous redox flow batteries in terms of lifetime and cost.

    Emmel, Dominik / Kunz, Simon / Blume, Nick / Kwon, Yongchai / Turek, Thomas / Minke, Christine / Schröder, Daniel

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 6672

    Abstract: Flow batteries are one option for future, low-cost stationary energy storage. We present a perspective overview of the potential cost of organic active materials for aqueous flow batteries based on a comprehensive mathematical model. The battery capital ... ...

    Abstract Flow batteries are one option for future, low-cost stationary energy storage. We present a perspective overview of the potential cost of organic active materials for aqueous flow batteries based on a comprehensive mathematical model. The battery capital costs for 38 different organic active materials, as well as the state-of-the-art vanadium system are elucidated. We reveal that only a small number of organic molecules would result in costs close to the vanadium reference system. We identify the most promising candidate as the phenazine 3,3'-(phenazine-1,6-diylbis(azanediyl))dipropionic acid) [1,6-DPAP], suggesting costs even below that of the vanadium reference. Additional cost-saving potential can be expected by mass production of these active materials; major benefits lie in the reduced electrolyte costs as well as power costs, although plant maintenance is a major challenge when applying organic materials. Moreover, this work is designed to be expandable. The developed calculation tool (ReFlowLab) accompanying this publication is open for updates with new data.
    Language English
    Publishing date 2023-10-21
    Publishing country England
    Document type Journal Article ; Review
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-42450-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Education of schoolchildren in cardiopulmonary resuscitation - overview of the current literature.

    Schroeder, Daniel C / Finke, Simon-Richard / Grübl, Tobias / Jänig, Christoph W / Böttiger, Bernd W

    Current opinion in critical care

    2023  Volume 29, Issue 6, Page(s) 616–620

    Abstract: Purpose of review: Recognition of cardiac arrest and initiation of cardiopulmonary resuscitation (CPR) can be learned and adequately replicated by schoolchildren. Regular instruction of schoolchildren in CPR is therefore a core element to increase low ... ...

    Abstract Purpose of review: Recognition of cardiac arrest and initiation of cardiopulmonary resuscitation (CPR) can be learned and adequately replicated by schoolchildren. Regular instruction of schoolchildren in CPR is therefore a core element to increase low bystander CPR rates. Thereby, schoolchildren CPR training evolved as own scientific field within the last decade. Aim was to describe current evidence in terms of epidemiology, teaching approaches and political aspects.
    Recent findings: Schoolchildren demonstrate a high motivation to be trained in CPR. Teaching approaches that combine theoretical and practical learning sessions guarantee a sustainable learning effect. Schoolchildren can adequately perform chest compressions and mouth-to-mouth ventilation from the age of 12 years. Use of digital media is a highly promising teaching approach. CPR training conducted by teachers from the own school is effective and guarantees continuous development of CPR skills. Integration of schoolchildren CPR training into school curricula is the foundation for a sustainable increase of lay resuscitation rates in the population. Scientific and political promotion of schoolchildren CPR training is needed to sensitize the population and move bystander CPR in the social focus.
    Summary: While bystander CPR rates are low in Europe comprehensive establishment of schoolchildren CPR training may sustainably increase survival after cardiac arrest.
    MeSH term(s) Humans ; Child ; Cardiopulmonary Resuscitation ; Internet ; Out-of-Hospital Cardiac Arrest/therapy ; Schools ; Europe
    Language English
    Publishing date 2023-10-09
    Publishing country United States
    Document type Review ; Journal Article
    ZDB-ID 1235629-3
    ISSN 1531-7072 ; 1070-5295
    ISSN (online) 1531-7072
    ISSN 1070-5295
    DOI 10.1097/MCC.0000000000001111
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  7. Article ; Online: The efficacy of apneic oxygenation during intubation using a prototype of an oxygenation laryngoscope - a technical simulation.

    Wetsch, Wolfgang A / Schroeder, Daniel C / Herff, Susanne J / Böttiger, Bernd W / Wenzel, Volker / Herff, Holger

    BMC anesthesiology

    2023  Volume 23, Issue 1, Page(s) 273

    Abstract: Background: Recently, a non-commercial oxygenation laryngoscope was able to maintain apneic oxygenation during simulated intubation efforts. Since that prototype was 3 mm wider than a standard Macintosh laryngoscope blade, the intubation performance of ... ...

    Abstract Background: Recently, a non-commercial oxygenation laryngoscope was able to maintain apneic oxygenation during simulated intubation efforts. Since that prototype was 3 mm wider than a standard Macintosh laryngoscope blade, the intubation performance of this device may differ from standard blades. A new prototype of an oxygenation laryngoscope was developed, consisting of a standard-size Macintosh blade and a fixed oxygen supply line to the side. Actually, it is unclear at which point of this blade the oxygen supply line should end to facilitate the best possible oxygen supply for apneic oxygenation.
    Methods: In this simulation study using a standardized human airway manikin, the efficacy of apneic oxygenation by oxygen insufflation using standard and modified Macintosh blades was compared: a standard Macintosh blade without oxygen supply line as control, one with an additional oxygen supply line ending proximal near the handle, one with the line ending at the middle of the blade, and one with the line ending near the tip. A preoxygenated test lung was connected to an oximeter with a flow rate of 200ml/min, simulating oxygen consumption of a male adult, and to the trachea of an anatomically correctly shaped airway manikin. Apneic oxygenation was performed and oxygen content was measured over a 20-minutes observation period. Experiments were repeated five times for each laryngoscope blade.
    Results: Oxygen percentage in the test lung dropped from 100 ± 0% at the start of the experiment to 53 ± 1.5% in the room air control group (p < 0.001 compared to all other groups), and to 74 ± 2.5% in the proximal oxygen line group, whereas oxygen percentage remained at 100% in both the medium and distal oxygen line groups (p = 1 between these groups; p < 0.001 between all other groups).
    Conclusions: In this simulation study with a preoxygenated airway manikin, the use of a modified Macintosh laryngoscope blade with oxygen line attached at the tip or at the middle were able to maintain apneic oxygenation without measurable drop of oxygen content over 20 min. Proximal placement of the oxygen supply line still showed an advantage against room air, however it did not completely prevent room air from entering the airway.
    Trial registration: Not applicable.
    MeSH term(s) Adult ; Humans ; Male ; Intubation, Intratracheal ; Laryngoscopes ; Laryngoscopy ; Lung ; Manikins ; Oxygen ; Oxygen Inhalation Therapy ; Apnea/therapy
    Chemical Substances Oxygen (S88TT14065)
    Language English
    Publishing date 2023-08-14
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2091252-3
    ISSN 1471-2253 ; 1471-2253
    ISSN (online) 1471-2253
    ISSN 1471-2253
    DOI 10.1186/s12871-023-02234-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: COCO: an annotated Twitter dataset of COVID-19 conspiracy theories.

    Langguth, Johannes / Schroeder, Daniel Thilo / Filkuková, Petra / Brenner, Stefan / Phillips, Jesper / Pogorelov, Konstantin

    Journal of computational social science

    2023  , Page(s) 1–42

    Abstract: The COVID-19 pandemic has been accompanied by a surge of misinformation on social media which covered a wide range of different topics and contained many competing narratives, including conspiracy theories. To study such conspiracy theories, we created a ...

    Abstract The COVID-19 pandemic has been accompanied by a surge of misinformation on social media which covered a wide range of different topics and contained many competing narratives, including conspiracy theories. To study such conspiracy theories, we created a dataset of 3495 tweets with manual labeling of the stance of each tweet w.r.t. 12 different conspiracy topics. The dataset thus contains almost 42,000 labels, each of which determined by majority among three expert annotators. The dataset was selected from COVID-19 related Twitter data spanning from January 2020 to June 2021 using a list of 54 keywords. The dataset can be used to train machine learning based classifiers for both stance and topic detection, either individually or simultaneously. BERT was used successfully for the combined task. The dataset can also be used to further study the prevalence of different conspiracy narratives. To this end we qualitatively analyze the tweets, discussing the structure of conspiracy narratives that are frequently found in the dataset. Furthermore, we illustrate the interconnection between the conspiracy categories as well as the keywords.
    Language English
    Publishing date 2023-04-04
    Publishing country Singapore
    Document type Journal Article
    ZDB-ID 2916161-7
    ISSN 2432-2725 ; 2432-2717
    ISSN (online) 2432-2725
    ISSN 2432-2717
    DOI 10.1007/s42001-023-00200-3
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  9. Article ; Online: Tailored Porous Transport Layers for Optimal Oxygen Transport in Water Electrolyzers: Combined Stochastic Reconstruction and Lattice Boltzmann Method.

    Liu, Jiang / Li, Min / Yang, Yingying / Schlüter, Nicolas / Mimic, Dajan / Schröder, Daniel

    Chemphyschem : a European journal of chemical physics and physical chemistry

    2023  Volume 24, Issue 18, Page(s) e202300197

    Abstract: The porous transport layer (PTL) plays an integral role for the mass transport in polymer electrolyte membrane (PEM) electrolyzers. In this work, a stochastic reconstruction method of titanium felt-based PTLs is applied and combined with the Lattice ... ...

    Abstract The porous transport layer (PTL) plays an integral role for the mass transport in polymer electrolyte membrane (PEM) electrolyzers. In this work, a stochastic reconstruction method of titanium felt-based PTLs is applied and combined with the Lattice Boltzmann method (LBM). The aim is to parametrically investigate the impact of different PTL structures on the transport of oxygen. The structural characteristics of a reconstructed PTL agree well with experimental investigations. Moreover, the impact of PTL porosity, fiber radius, and anisotropy parameter on the structural characteristics of PTLs are analyzed, and their impact on oxygen transport are elucidated by LBM. Eventually, a customized graded PTL is reconstructed, exhibiting almost optimal mass transport performance for the removal of oxygen. The results show that a higher porosity, larger fiber radius, and smaller anisotropy parameter facilitate the formation of oxygen propagation pathways. By tailoring the fiber characteristics and thus optimizing the PTLs, guidelines for the optimal design and manufacturing can be obtained for large-scale PTLs for electrolyzers.
    Language English
    Publishing date 2023-07-20
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2025223-7
    ISSN 1439-7641 ; 1439-4235
    ISSN (online) 1439-7641
    ISSN 1439-4235
    DOI 10.1002/cphc.202300197
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  10. Book ; Online ; Thesis: Detailed kinetic modeling in the energy conversion processes of low-carbon alternative fuels

    Nadiri, Solmaz Verfasser] / [Fernandes, Ravi [Akademischer Betreuer] / Schröder, Daniel [Akademischer Betreuer] / Shu, Bo [Akademischer Betreuer]

    2024  

    Author's details Solmaz Nadiri ; Ravi Fernandes, Daniel Schröder, Bo Shu
    Keywords Technische Chemie ; Technical Chemistry
    Subject code sg660
    Language English
    Publisher Technische Universität Braunschweig
    Publishing place Braunschweig
    Document type Book ; Online ; Thesis
    Database Digital theses on the web

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