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Article ; Online: What the eyes reveal: Investigating the detection of automation failures.

Bruder, Carmen / Hasse, Catrin

2019 Volume 82, Page(s) 102967

Abstract: In order to detect automation failures in a timely manner, operators are required to monitor automated systems efficiently. The present study analysed eye movements to predict whether or not participants could detect an automation failure. Eye movements ... ...

Abstract	In order to detect automation failures in a timely manner, operators are required to monitor automated systems efficiently. The present study analysed eye movements to predict whether or not participants could detect an automation failure. Eye movements were recorded whilst 101 participants were monitoring an automated system where automation failures occurred at irregular intervals. A main result is that about 75.6 per cent of automation failure detections were predicted successfully by the corresponding eye movements. In cases where failures were detected successfully, relevant information is monitored more often and more intensively, in particular shortly before an automation failure happens and while it is happening. The findings are discussed in the context of the personnel selection and training of aviation operatives, as well as incident reporting as used in air traffic control (ATC).
MeSH term(s)	Aircraft/instrumentation ; Automation ; Aviation ; Computer Simulation ; Equipment Failure ; Ergonomics ; Eye Movements ; Humans ; Man-Machine Systems ; Psychomotor Performance ; Reaction Time
Language	English
Publishing date	2019-10-03
Publishing country	England
Document type	Journal Article
ZDB-ID	2003513-5
ISSN	1872-9126 ; 0003-6870
ISSN (online)	1872-9126
ISSN	0003-6870
DOI	10.1016/j.apergo.2019.102967
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Updating an existing online adaptation support tool: insights from an evaluation

Haße, Clemens / Kind, Christian

Climatic change. 2019 Apr., v. 153, no. 4

2019

Abstract: The Klimalotse (“climate navigator”) is an online tool to support climate change adaptation. Its target audience is decision makers at the local and regional levels. The tool was first published in 2010 by the German Federal Environment Agency. After ... ...

Abstract	The Klimalotse (“climate navigator”) is an online tool to support climate change adaptation. Its target audience is decision makers at the local and regional levels. The tool was first published in 2010 by the German Federal Environment Agency. After several years, the Agency evaluated the changing needs of decision makers and the real use of the tool. Decision makers are confronted with various challenges and barriers both prior to and while creating and implementing climate change adaptation measures. In order to be able to take these factors into account in the revision of the Klimalotse, the accompanying research looked into climate change adaptation from the perspective of public institutions and their decision-making processes. In the light of that work, the Agency published a completely revised second edition. This article summarises the lessons learned on that journey.
Keywords	climate change ; computer software ; decision making
Language	English
Dates of publication	2019-04
Size	p. 559-567.
Publishing place	Springer Netherlands
Document type	Article
ZDB-ID	751086-x
ISSN	0165-0009
ISSN	0165-0009
DOI	10.1007/s10584-018-2166-6
Database	NAL-Catalogue (AGRICOLA)

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Book ; Online: A comparison of mechanistic models for the combustion of iron microparticles and their application to polydisperse iron-air suspensions

Mich, Johannes / Braig, Daniel / Gustmann, Tobias / Hasse, Christian / Scholtissek, Arne

2023

Abstract: Metals can serve as carbon-free energy carriers, e. g. in innovative metal-metal oxide cycles as proposed by Bergthorson (Prog. Energy Combust. Sci., 2018). Iron powder is a suitable candidate since it can be oxidized with air. Nevertheless, the ... ...

Abstract	Metals can serve as carbon-free energy carriers, e. g. in innovative metal-metal oxide cycles as proposed by Bergthorson (Prog. Energy Combust. Sci., 2018). Iron powder is a suitable candidate since it can be oxidized with air. Nevertheless, the combustion of iron powder in air is challenging especially with respect to flame stabilization which depends on the particle size distribution among other factors. Models for the prediction of reaction front speed in iron-air suspensions can contribute to overcoming this challenge. To this end, three different models for iron particle oxidation are integrated into a laminar flame solver for simulating reaction fronts. The scientific objective of this work is to elucidate the influence of polydispersity on the reaction front speed, which is still not satisfactorily understood. In a systematic approach, cases with successively increasing complexity are considered: From single particle combustion to iron-air suspensions prescribing binary particle size distributions (PSDs), generic PSDs, and a PSD measured for a real iron powder sample. The simulations show that, dependent on the PSD, particles undergo thermochemical conversion in a sequential manner according to their size and every particle fraction exhibits an individual combustion environment. The local environment can be leaner or richer than the overall iron-to-air ratio would suggest and can be very different from single particle experiments. The contribution of individual particle fractions to the overall reaction front speed depends on its ranking within the PSD. The study further demonstrates, that although the three particle models show good agreement for single particle combustion, they lead to very different reaction front speeds. This is due to the different ignition behavior predicted by the particle models, which is shown to strongly influence the reaction front characteristics. Comment: Submitted to Combustion and Flame
Keywords	Physics - Fluid Dynamics
Subject code	551
Publishing date	2023-04-28
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The potential of retrofitting existing coal power plants: A case study for operation with green iron

Janicka, J. / Debiagi, P. / Scholtissek, A. / Dreizler, A. / Epple, B. / Pawellek, R. / Maltsev, A. / Hasse, C.

Applied Energy. 2023 June, v. 339 p.120950-

2023

Abstract: Storing electrical energy for long periods and transporting it over long distances is an essential task of the necessary transition to a CO₂-free energy economy. An oxidation–reduction cycle based on iron and its oxides represents a very promising ... ...

Abstract	Storing electrical energy for long periods and transporting it over long distances is an essential task of the necessary transition to a CO₂-free energy economy. An oxidation–reduction cycle based on iron and its oxides represents a very promising technology in this regard. The present work assesses the potential of converting an existing modern coal-fired power plant to operation with iron. For this purpose, a systematic retrofit study is carried out, employing a model that balances all material and energy fluxes in a state-of-the-art coal-fired power plant. Particular attention is given to components of the burner system and the system’s heat exchanger. The analysis provides evidence that main components such as the steam generator and steam cycle can be reused with moderate modifications. Major modifications are related to the larger amounts of solids produced during iron combustion, for instance in the particle feeding and removal systems. Since the high particle densities and lower demand for auxiliary systems improve the heat transfer, the net efficiencies of iron operation can be one to two percentage points better than coal operation, depending on operating conditions. This new insight can significantly accelerate the introduction of this innovative technology by guiding future research and the development of the retrofit option.
Keywords	case studies ; coal ; combustion ; electric power ; energy ; generators (equipment) ; heat exchangers ; heat transfer ; iron ; models ; power plants ; steam ; Clean energy ; CO2-free ; Power plant retrofit ; Metal fuels ; Iron cycle ; Energy Storage
Language	English
Dates of publication	2023-06
Publishing place	Elsevier Ltd
Document type	Article ; Online
ZDB-ID	2000772-3
ISSN	0306-2619
ISSN	0306-2619
DOI	10.1016/j.apenergy.2023.120950
Database	NAL-Catalogue (AGRICOLA)

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Book ; Online: Particle formation in oxymethylene ethers (OMEn, n = 2-4) / ethylene premixed flames

Schmitz, Robert / Ferraro, Federica / Sirignano, Mariano / Hasse, Christian

2022

Abstract: Alternative synthetic fuels can be produced by renewable energy sources and represent a potential route for solving long-term energy storage. Among them, oxygenated fuels have the advantage of significantly reducing pollutant emissions and can therefore ... ...

Abstract	Alternative synthetic fuels can be produced by renewable energy sources and represent a potential route for solving long-term energy storage. Among them, oxygenated fuels have the advantage of significantly reducing pollutant emissions and can therefore be used as carbon-neutral substitute fuels for transportation. In this work, the sooting propensity of different oxymethylene ethers (OMEn) is investigated using a combined experimental and numerical study on a series of burner-stabilized premixed flames under mild to severe sooting conditions. Herein, mixtures of ethylene in combination with the three individual OMEn for n=2-4 are compared in terms of soot formation behavior with pure ethylene flames. The kinetic mechanism from Sun et al. (Proc. Combust. Inst. 36, 1269-1278, 2017) for oxymethylene ether OMEn combustion with n=1-3 is extended to include OME4 decomposition and combustion kinetics. In the numerical simulations, the kinetic mechanism is combined with a detailed quadvariate soot model which uses the Conditional Quadrature Method of Moments and validated with Laser-Induced Fluorescence (LIF) and Laser-Induced Incandescence (LII) measurements. It is observed, that the three investigated OMEn with n=2-4 show similar sooting behavior, mainly reducing larger aggregates while not significantly affecting the formation of smaller particles. Furthermore, the extent of soot reduction is comparable among the three OMEn. The trends and overall reduction are very well captured by the model. The modeling results are analyzed through reaction path analyses and sensitivity studies which show the important role of OMEn decomposition and the formation of CH2O under these rich conditions to reduce species relevant for soot formation. This is at the base of the negligible observed differences in terms of soot formation for the different OMEn fuels.
Keywords	Physics - Chemical Physics
Subject code	660
Publishing date	2022-04-22
Publishing country	us
Document type	Book ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Book ; Online: An Anthropology of Learning

Hasse, Cathrine

On Nested Frictions in Cultural Ecologies

2014

Abstract: This book has one explicit purpose: to present a new theory of cultural learning in organisations which combines practice-based learning with cultural models - a cognitive anthropological schema theory of taken-for-granted connections - tied to the ... ...

Abstract	This book has one explicit purpose: to present a new theory of cultural learning in organisations which combines practice-based learning with cultural models - a cognitive anthropological schema theory of taken-for-granted connections - tied to the everyday meaningful use of artefacts. The understanding of culture as emerging in a process of learning open up for new understandings, which is useful for researchers, practitioners and students interested in dynamic studies of culture and cultural studies of organisations. The new approach goes beyond culture as a static, essentialist entity and open for our possibility to learn in organisations across national cultures, across ethnicity and across the apparently insurmountable local educational differences which makes it difficult for people to communicate working together in an increasingly globalized world. The empirical examples are mainly drawn from organisations of education and science which are melting-pots of cultural encounters.
Keywords	Psychologie / Pädagogik Pädagogik
Language	English
Size	Online-Ressource
Edition	1. Aufl.
Publisher	Springer-Verlag
Publishing place	s.l.
Document type	Book ; Online
Note	Description based upon print version of record
ISBN	940179605X ; 9789401796057
Database	Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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Article ; Online: Rapid Hydrogen Shift Reactions in Acyl Peroxy Radicals.

Knap, Hasse C / Jørgensen, Solvejg

The journal of physical chemistry. A

2017 Volume 121, Issue 7, Page(s) 1470–1479

Abstract: We have used quantum mechanical chemical calculations (CCSD(T)-F12a/cc-pVDZ-F12//M06-2X/aug-cc-pVTZ) to investigate the hydrogen shift (H-shift) reactions in acyl peroxy and hydroperoxy acyl peroxy radicals. We have focused on the H-shift reactions from ... ...

Abstract	We have used quantum mechanical chemical calculations (CCSD(T)-F12a/cc-pVDZ-F12//M06-2X/aug-cc-pVTZ) to investigate the hydrogen shift (H-shift) reactions in acyl peroxy and hydroperoxy acyl peroxy radicals. We have focused on the H-shift reactions from a hydroperoxy group (OOH) (1,X-OOH H-shift with X = 6, 7, 8, or 9) in the hydroperoxy acyl peroxy radicals, this H-shift is a reversible reaction and it scrambles between two peroxides, hydroperoxy acyl peroxy and peroxy peroxoic acid radicals. The forward reaction rate constants of the 1,X-OOH H-shift reactions are estimated to be above 10
Language	English
Publishing date	2017-02-23
Publishing country	United States
Document type	Journal Article
ISSN	1520-5215
ISSN (online)	1520-5215
DOI	10.1021/acs.jpca.6b12787
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Hämorrhoiden in der Schwangerschaft.

Hasse, C

Deutsche medizinische Wochenschrift (1946)

2001 Volume 126, Issue 28-29, Page(s) 832

Title translation	Hemorrhoids during pregnancy.
MeSH term(s)	Constipation ; Constriction ; Female ; Hemorrhoids/prevention & control ; Hemorrhoids/surgery ; Humans ; Pregnancy ; Pregnancy Complications/prevention & control ; Pregnancy Complications/surgery ; Sphincterotomy, Endoscopic ; Time Factors
Language	German
Publishing date	2001-07-13
Publishing country	Germany
Document type	Letter
ZDB-ID	200446-x
ISSN	1439-4413 ; 0012-0472
ISSN (online)	1439-4413
ISSN	0012-0472
DOI	10.1055/s-2001-15701
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Article ; Online: Incidence and clinical impact of renal failure and bleeding following transcatheter tricuspid valve annuloplasty.

Gietzen, Thorsten / Althoff, Jan / Ochs, Laurin / Gerçek, Muhammed / von Stein, Jennifer / Hasse, Caroline / Iliadis, Christos / Friedrichs, Kai / Rudolph, Volker / Baldus, Stephan / Pfister, Roman / Körber, Maria Isabel

Clinical research in cardiology : official journal of the German Cardiac Society

2024

Abstract: Background: Bleeding is the most common complication after percutaneous leaflet-based tricuspid valve repair and associated with acute kidney injury (AKI) and adverse outcome. TTVA with the Cardioband system is a technically more complex procedure; ... ...

Abstract	Background: Bleeding is the most common complication after percutaneous leaflet-based tricuspid valve repair and associated with acute kidney injury (AKI) and adverse outcome. TTVA with the Cardioband system is a technically more complex procedure; however, frequency and prognostic impact of postinterventional bleeding and renal complications have not been thoroughly examined. Aims: This study was performed to determine the incidence and clinical impact of bleeding complications (MVARC criteria) and acute kidney injury (KDIGO criteria) following transcatheter tricuspid valve annuloplasty (TTVA). Methods: In a bi-center retrospective analysis of patients undergoing TTVA between 2018 and 2022, we examined frequency, predictors, and clinical impact of bleeding and renal failure. Results: In 145 consecutive patients, the incidence of any MVARC bleeding was 20.7% (n = 30), whereas major MVARC bleeding occurred in 6.9% (n = 10). The incidence of AKI was 18.6% (n = 27). Risk factors for bleeding events included low baseline hemoglobin and elevated baseline creatinine levels. Risk factors for AKI included diabetes mellitus, arterial hypertension, high body mass index, and elevated baseline creatinine levels. Neither procedure duration nor amount of contrast media was associated with AKI or bleeding. Both bleeding and AKI led to a longer hospital stay. At 3 months, 10.0% (n = 3) of patients with bleeding and 7.8% (n = 9) of patients without bleeding complications died (p = 0.70). Additionally, mortality rate was 7.4% (n = 2) in patients with AKI compared to 8.5% (n = 10) without AKI (p = 0.83). Conclusion: While about a fifth of patients undergoing TTVA suffered from postinterventional AKI or bleeding, none of these complications was associated with higher mortality at short-term follow-up. One important risk factor for both complications was chronic renal dysfunction, indicating a high-risk patient population. The most frequent bleeding localizations were the femoral access site, pericardial hemorrhage, and the esophagus, which need explicit attention in periprocedural management.
Language	English
Publishing date	2024-02-15
Publishing country	Germany
Document type	Journal Article
ZDB-ID	2213295-8
ISSN	1861-0692 ; 1861-0684
ISSN (online)	1861-0692
ISSN	1861-0684
DOI	10.1007/s00392-024-02388-4
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Article ; Online: Exploring the oxidation behavior of undiluted and diluted iron particles for energy storage: Mössbauer spectroscopic analysis and kinetic modeling.

Spielmann, Jonas / Braig, Daniel / Streck, Antonia / Gustmann, Tobias / Kuhn, Carola / Reinauer, Felix / Kurnosov, Alexandr / Leubner, Oliver / Potapkin, Vasily / Hasse, Christian / Deutschmann, Olaf / Etzold, Bastian J M / Scholtissek, Arne / Kramm, Ulrike I

Physical chemistry chemical physics : PCCP

2024 Volume 26, Issue 17, Page(s) 13049–13060

Abstract: Iron is an abundant and non-toxic element that holds great potential as energy carrier for large-scale and long-term energy storage. While from a general viewpoint iron oxidation is well-known, the detailed kinetics of oxidation for micrometer sized ... ...

Abstract	Iron is an abundant and non-toxic element that holds great potential as energy carrier for large-scale and long-term energy storage. While from a general viewpoint iron oxidation is well-known, the detailed kinetics of oxidation for micrometer sized particles are missing, but required to enable large-scale utilization for energy production. In this work, iron particles are subjected to temperature-programmed oxidation. By dilution with boron nitride a sintering of the particles is prevented enabling to follow single particle effects. The mass fractions of iron and its oxides are determined for different oxidation times using Mössbauer spectroscopy. On the basis of the extracted phase compositions obtained at different times and temperatures (600-700 °C), it can be concluded that also for particles the oxidation follows a parabolic rate law. The parabolic rate constants are determined in this transition region. Knowledge of the particle size distribution and its consideration in modeling the oxidation kinetics of iron powder has proven to be crucial.
Language	English
Publishing date	2024-05-01
Publishing country	England
Document type	Journal Article
ZDB-ID	1476244-4
ISSN	1463-9084 ; 1463-9076
ISSN (online)	1463-9084
ISSN	1463-9076
DOI	10.1039/d3cp03484d
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