TY  - JOUR
A1  - Kurz, Melanie
T1  - Images of Sweden in Germany: from Sundborn and Bullerby to Ikea
JF  - nomad: the magazine for new design culture, business affairs and contemporary lifestyle
Y1  - 2019
SN  - 2513-0714
IS  - 8
SP  - 136
EP  - 147
ER  - 
TY  - CHAP
A1  - Kurz, Melanie
T1  - Theses on the significance of the model in the form-finding process
T2  - "Focused" - Current Design Research Projects and Methods : Swiss Design Network Symposium 2008, 30 - 31 May 2008 Mount Gurten, Berne Switzerland
Y1  - 2008
SN  - 978-3-9523138-0-0
N1  - Swiss Design Network Symposium 2008, Bern
SP  - 115
EP  - 127
PB  - SwissDesignNetwork, SDN
CY  - Genf
ER  - 
TY  - JOUR
A1  - Kurulgan Demirci, Eylem
A1  - Linder, Peter
A1  - Demirci, Taylan
A1  - Trzewik, Jürgen
A1  - Digel, Ilya
A1  - Artmann, Gerhard
A1  - Temiz Artmann, Aysegül
T1  - Contractile tension of endothelial cells: An LPS based in-vitro sepsis model
JF  - IUBMB Life. 61 (2009), H. 3
Y1  - 2009
SN  - 1521-6543
N1  - Abstracts: Turkish Society of Molecular Medicine, Third International Congress of Molecular Medicine, May 5-8, 2009, Istanbul, Turkey
SP  - 307
EP  - 308
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - CHAP
A1  - Kurulgan Demirci, Eylem
A1  - Linder, Peter
A1  - Demirci, Taylan
A1  - Gierkowski, Jessica R.
A1  - Digel, Ilya
A1  - Gossmann, Matthias
A1  - Temiz Artmann, Aysegül
T1  - rhAPC reduces the endothelial cell permeability via a decrease of cellular mechanical contractile tensions : [abstract]
N2  - In this study, the CellDrum technology quanitfying cellular mechanical tension on a pico-scale was used to investigate the effect of LPS (lipopolysaccharide) on HAoEC (Human Aortic Endothelial Cell) tension.
KW  - Endothelzelle
KW  - Sepsis
KW  - kontraktile Spannung
KW  - rhAPC
KW  - contractile tension
KW  - rhAPC
KW  - celldrum technology
Y1  - 2010
ER  - 
TY  - JOUR
A1  - Kurulgan Demirci, Eylem
A1  - Demirci, Taylan
A1  - Linder, Peter
A1  - Trzewik, Jürgen
A1  - Gierkowski, Jessica Ricarda
A1  - Gossmann, Matthias
A1  - Kayser, Peter
A1  - Porst, Dariusz
A1  - Digel, Ilya
A1  - Artmann, Gerhard
A1  - Temiz Artmann, Aysegül
T1  - rhAPC reduces the endothelial cell permeability via a decrease of contractile tensions induced by endothelial cells
JF  - Journal of Bioscience and Bioengineering
N2  - All cells generate contractile tension. This strain is crucial for mechanically controlling the cell shape, function and survival. In this study, the CellDrum technology quantifying cell's (the cellular) mechanical tension on a pico-scale was used to investigate the effect of lipopolysaccharide (LPS) on human aortic endothelial cell (HAoEC) tension. The LPS effect during gram-negative sepsis on endothelial cells is cell contraction causing endothelium permeability increase. The aim was to finding out whether recombinant activated protein C (rhAPC) would reverse the endothelial cell response in an in-vitro sepsis model. In this study, the established in-vitro sepsis model was confirmed by interleukin 6 (IL-6) levels at the proteomic and genomic levels by ELISA, real time-PCR and reactive oxygen species (ROS) activation by florescence staining. The thrombin cellular contraction effect on endothelial cells was used as a positive control when the CellDrum technology was applied. Additionally, the Ras homolog gene family, member A (RhoA) mRNA expression level was checked by real time-PCR to support contractile tension results. According to contractile tension results, the mechanical predominance of actin stress fibers was a reason of the increased endothelial contractile tension leading to enhanced endothelium contractility and thus permeability enhancement. The originality of this data supports firstly the basic measurement principles of the CellDrum technology and secondly that rhAPC has a beneficial effect on sepsis influenced cellular tension. The technology presented here is promising for future high-throughput cellular tension analysis that will help identify pathological contractile tension responses of cells and prove further cell in-vitro models.
KW  - Cell permeability
KW  - Cellular force
KW  - Endothelial cells
KW  - Recombinant activated protein C
KW  - Lipopolysaccharide
KW  - Contractile tension
KW  - CellDrum
Y1  - 2012
U6  - https://doi.org/10.1016/j.jbiosc.2012.03.019
SN  - 1347-4421
VL  - 113
IS  - 2
SP  - 212
EP  - 219
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Kurulgan Demirci, Eylem
A1  - Demirci, T.
A1  - Trzewik, Jürgen
A1  - Linder, Peter
A1  - Karakulah, G.
A1  - Artmann, Gerhard
A1  - Sakizli, M.
A1  - Temiz Artmann, Aysegül
T1  - Genome-Wide Gene Expression Analysis of NIH 3T3 Cell Line Under Mechanical Stimulation
JF  - Cellular and molecular bioengineering. 4 (2011), H. 1
Y1  - 2011
SN  - 1865-5025
SP  - 46
EP  - 55
PB  - Springer
CY  - Berlin
ER  - 
TY  - THES
A1  - Kurulgan Demirci, Eylem
T1  - The effect of rhAPC on contractile tension : an in-vitro sepsis model of cardiomyocytes and endothelial cells
T1  - Der Effekt von rhAPC auf die zelluläre Kontraktionskraft : ein In-vitro-Sepsismodell für Kardiomyozyten und Endothelzellen
Y1  - 2012
N1  - Aachen, Techn. Hochsch., Diss., 2012
ER  - 
TY  - JOUR
A1  - Kurowski, A.
A1  - Schultze, J.W.
A1  - Lüth, H.
A1  - Schöning, Michael Josef
T1  - Micro- and nanopatterning of sensor chips by means of macroporous silicon
JF  - Transducers '01 Eurosensors XV : digest of technical papers / the 11th International Conference on Solid-State Sensors and Actuators, June 10-14, 2001, Munich, Germany. Ernst Obermeier (Ed.)
Y1  - 2001
SN  - 3-540-42150-5
N1  - Eurosensors (15, 2001, München) ; International Conference on Solid State Sensors and Actuators (11, 2001, München)
SP  - 640
EP  - 643
PB  - Springer
CY  - Berlin [u.a.]
ER  - 
TY  - JOUR
A1  - Kurowski, A.
A1  - Schultze, J.
A1  - Lüth, H.
A1  - Schöning, Michael Josef
T1  - Micro- and nanopatterning of sensor chips by means of macroporous silicon.
JF  - Sensors and Actuators B. 83 (2002), H. 1-3
Y1  - 2002
SN  - 0925-4005
N1  - Selected Papers from TRANSDUCERS '01 EUROSENSORS XV
SP  - 123
EP  - 128
ER  - 
TY  - JOUR
A1  - Kuropka, Rolf
A1  - Müller, Bettina
A1  - Höcker, Hartwig
A1  - Berndt, Heinz
T1  - Chiral stationary phases via hydrosilylation reaction of N-acryloylamino acids : I. Stationary phase with one chiral centre for high-performance liquid chromatography and development of a new derivatization pattern for amino acid enantiomers
JF  - Journal of chromatography A
Y1  - 1989
SN  - 0021-9673
IS  - 481
SP  - 380
EP  - 386
ER  - 
TY  - CHAP
A1  - Kuperjans, Isabel
ED  - Bourg, Dominique
ED  - Erkman, Suren
T1  - Decision-support-system for technical, economical and ecological design and evaluation of industrial energy systems
T2  - Industrial ecology and sustainability : conferences and workshops ; September 22 - 25, 1999, Troyes, France
Y1  - 2000
PB  - Université de technologie de Troyes Genève : Institute for communication and analysis of science and technology
CY  - [Troyes]
ER  - 
TY  - JOUR
A1  - Kunkel, Maximilian Hugo
A1  - Gebhardt, Andreas
A1  - Mpofu, Khumbulani
A1  - Kallweit, Stephan
T1  - Quality assurance in metal powder bed fusion via deep-learning-based image classification
JF  - Rapid Prototyping Journal
Y1  - 2019
U6  - https://doi.org/10.1108/RPJ-03-2019-0066
SN  - 1355-2546
VL  - 26
IS  - 2
SP  - 259
EP  - 266
ER  - 
TY  - JOUR
A1  - Kunkel, Maximilian Hugo
A1  - Gebhardt, Andreas
A1  - Mpofu, Khumbaulani
A1  - Kallweit, Stephan
T1  - Statistical assessment of mechanical properties of selective laser melted specimens of stainless steel
JF  - The International Journal of Advanced Manufacturing Technology
N2  - The rail business is challenged by long product life cycles and a broad spectrum of assembly groups and single parts. When spare part obsolescence occurs, quick solutions are needed. A reproduction of obsolete parts is often connected to long waiting times and minimum lot quantities that need to be purchased and stored. Spare part storage is therefore challenged by growing stocks, bound capital and issues of part ageing. A possible solution could be a virtual storage of spare parts which will be 3D printed through additive manufacturing technologies in case of sudden demand. As mechanical properties of additive manufactured parts are neither guaranteed by machine manufacturers nor by service providers, the utilization of this relatively young technology is impeded and research is required to address these issues. This paper presents an examination of mechanical properties of specimens manufactured from stainless steel through the selective laser melting (SLM) process. The specimens were produced in multiple batches. This paper interrogates the question if the test results follow a normal distribution pattern and if mechanical property predictions can be made. The results will be put opposite existing threshold values provided as the industrial standard. Furthermore, probability predictions will be made in order to examine the potential of the SLM process to maintain state-of-the-art mechanical property requirements.
Y1  - 2018
U6  - https://doi.org/10.1007/s00170-018-2040-8
SN  - 0268-3768
VL  - 98
IS  - 5-8
SP  - 1409
EP  - 1431
PB  - Springer
CY  - London
ER  - 
TY  - CHAP
A1  - Kunfermann, Philipp
A1  - Drumm, Christian
T1  - Lifting XML schemas to ontologies - the concept finder algorithm
T2  - MEDIATE 2005 First International Workshop on Mediation in Semantic Web Services    Proceedings of the First International Workshop on Mediation in Semantic Web Services (MEDIATE 2005)
Y1  - 2005
SP  - 113
EP  - 122
ER  - 
TY  - CHAP
A1  - Kumaran, P.
A1  - Gopinathan, M.
A1  - Razali, N. M.
A1  - Kuperjans, Isabel
A1  - Hariffin, B.
A1  - Hamdan, H.
T1  - Preliminary evaluation of atomization characteristics of improved biodiesel for gas turbine application
T2  - IOP Conference Series: Earth and Environmental Science (EES)
Y1  - 2013
U6  - https://doi.org/10.1088/1755-1315/16/1/012014
SN  - 1755-1315
VL  - 16
IS  - 1
SP  - 012014/1
EP  - 012014/4
PB  - Institute of Physics Publishing (IOP)
CY  - London [u.a.]
ER  - 
TY  - JOUR
A1  - Kuhnhenne, Markus
A1  - Reger, Vitali
A1  - Pyschny, Dominik
A1  - Döring, Bernd
T1  - Influence of airtightness of steel sandwich panel joints on heat losses
JF  - E3S Web of Conferences 12th Nordic Symposium on Building Physics (NSB 2020)
N2  - Energy saving ordinances requires that buildings must be designed in such a way that the heat transfer surface including the joints is permanently air impermeable. The prefabricated roof and wall panels in lightweight steel constructions are airtight in the area of the steel covering layers. The sealing of the panel joints contributes to fulfil the comprehensive requirements for an airtight building envelope. To improve the airtightness of steel sandwich panels, additional sealing tapes can be installed in the panel joint. The influence of these sealing tapes was evaluated by measurements carried out by the RWTH Aachen University - Sustainable Metal Building Envelopes. Different installation situations were evaluated by carrying out airtightness tests for different joint distances. In addition, the influence on the heat transfer coefficient was also evaluated using the Finite Element Method (FEM). The combination of obtained air volume flow and transmission losses enables to create an "effective heat transfer coefficient" due to transmission and infiltration. This summarizes both effects in one value and is particularly helpful for approximate calculations on energy efficiency.
Y1  - 2020
U6  - https://doi.org/10.1051/e3sconf/202017205008
VL  - 172
IS  - Art. 05008
PB  - EDP Sciences
CY  - Les Ulis
ER  - 
TY  - CHAP
A1  - Kuhnhenne, Markus
A1  - Döring, Bernd
A1  - Pyschny, Dominik
A1  - Feldmann, Markus
T1  - Energy efficient sandwich construction
T2  - Proceedings of the VI International Congress on Architectural Envelopes : 20.6. - 22.6.2012, San Sebastian, Spain
Y1  - 2012
SP  - 277
EP  - 285
PB  - ICAE
ER  - 
TY  - JOUR
A1  - Kuhnert, Marie-Therese
A1  - Bialonski, Stephan
A1  - Noenning, Nina
A1  - Mai, Heinke
A1  - Hinrichs, Hermann
A1  - Helmstaedter, Christoph
A1  - Lehnertz, Klaus
T1  - Incidental and intentional learning of verbal episodic material differentially modifies functional brain networks
JF  - Plos one
N2  - Learning- and memory-related processes are thought to result from dynamic interactions in large-scale brain networks that include lateral and mesial structures of the temporal lobes. We investigate the impact of incidental and intentional learning of verbal episodic material on functional brain networks that we derive from scalp-EEG recorded continuously from 33 subjects during a neuropsychological test schedule. Analyzing the networks' global statistical properties we observe that intentional but not incidental learning leads to a significantly increased clustering coefficient, and the average shortest path length remains unaffected. Moreover, network modifications correlate with subsequent recall performance: the more pronounced the modifications of the clustering coefficient, the higher the recall performance. Our findings provide novel insights into the relationship between topological aspects of functional brain networks and higher cognitive functions.
Y1  - 2013
U6  - https://doi.org/10.1371/journal.pone.0080273
VL  - 8
IS  - 11
PB  - PLOS
CY  - San Francisco
ER  - 
TY  - CHAP
A1  - Kuhlmann, Wolfram
A1  - Butenweg, Christoph
A1  - Lopez, Marijen
A1  - Fernandez, Sebastian
T1  - Seismic vulnerability assessment of the historic Aachen Cathedral
T2  - Conference proceedings / 13th World Conference on Earthquake Engineering [Vancouver, British Columbia, Canada, August 1 - 6, 2004] / [hosted by CAEE/ACGP, Canadian Association for Earthquake Engineering]
Y1  - 2004
SP  - 1
EP  - 14
PB  - CAEE
CY  - Vancouver
ER  - 
TY  - CHAP
A1  - Kuhlen, Max
A1  - Digel, Ilya
ED  - Erni, Daniel
ED  - Fischerauer, Alice
ED  - Himmel, Jörg
ED  - Seeger, Thomas
ED  - Thelen, Klaus
T1  - Fluorescence signatures and detection limits of ubiquitous terrestrial bio-compounds
T2  - 2nd YRA MedTech Symposium 2017 : June 8th - 9th / 2017 / Hochschule Ruhr-West
Y1  - 2017
SN  - 978-3-9814801-9-1
U6  - https://doi.org/10.17185/duepublico/43984
N1  - A young researchers track of the 7th IEEE Workshop & SENSORICA 2017
SP  - 102
EP  - 103
PB  - Universität Duisburg-Essen
CY  - Duisburg
ER  - 
TY  - JOUR
A1  - Kuerten, David
A1  - Kotliar, Konstantin
A1  - Fuest, Matthias
A1  - Walter, Peter
A1  - Hollstein, Muriel
A1  - Plange, Niklas
ED  - Neri, Piergiorgio
T1  - Does hemispheric vascular regulation differ significantly in glaucoma patients with altitudinal visual field asymmetry? A single-center, prospective study
JF  - International Ophthalmology
N2  - Purpose Vascular risk factors and ocular perfusion are heatedly discussed in the pathogenesis of glaucoma. The retinal vessel analyzer (RVA, IMEDOS Systems, Germany) allows noninvasive measurement of retinal vessel regulation. Significant differences especially in the veins between healthy subjects and patients suffering from glaucoma were previously reported. In this pilot-study we investigated if localized vascular regulation is altered in glaucoma patients with altitudinal visual field defect asymmetry. Methods 15 eyes of 12 glaucoma patients with advanced altitudinal visual field defect asymmetry were included. The mean defect was calculated for each hemisphere separately (-20.99 ± 10.49 pro- found hemispheric visual field defect vs -7.36 ± 3.97 dB less profound hemisphere). After pupil dilation, RVA measurements of retinal arteries and veins were conducted using the standard protocol. The superior and inferior retinal vessel reactivity were measured consecutively in each eye. Results Significant differences were recorded in venous vessel constriction after flicker light stimulation and overall amplitude of the reaction (p \ 0.04 and p \ 0.02 respectively) in-between the hemispheres spheres. Vessel reaction was higher in the hemisphere corresponding to the more advanced visual field defect. Arterial diameters reacted similarly, failing to reach statistical significance. Conclusion Localized retinal vessel regulation is significantly altered in glaucoma patients with asymmetri altitudinal visual field defects. Veins supplying the hemisphere concordant to a less profound visual field defect show diminished diameter changes. Vascular dysregulation might be particularly important in early glaucoma stages prior to a significant visual field defect.
KW  - Glaucoma
KW  - Visual field asymmetry
KW  - Ocular blood flow
KW  - RVA
KW  - Vascular response
Y1  - 2021
SN  - 1573-2630
U6  - https://doi.org/10.1007/s10792-021-01876-0
VL  - 41
IS  - 41
SP  - 3109
EP  - 3119
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Kuchler, Timon
A1  - Günthner, Roman
A1  - Ribeiro, Andrea
A1  - Hausinger, Renate
A1  - Streese, Lukas
A1  - Wöhnl, Anna
A1  - Kesseler, Veronika
A1  - Negele, Johanna
A1  - Assali, Tarek
A1  - Carbajo-Lozoya, Javier
A1  - Lech, Maciej
A1  - Adorjan, Kristina
A1  - Stubbe, Hans Christian
A1  - Hanssen, Henner
A1  - Kotliar, Konstantin
A1  - Haller, Berhard
A1  - Heemann, Uwe
A1  - Schmaderer, Christoph
T1  - Persistent endothelial dysfunction in post-COVID-19 syndrome and its associations with symptom severity and chronic inflammation
N2  - Background
Post-COVID-19 syndrome (PCS) is a lingering disease with ongoing symptoms such as fatigue and cognitive impairment resulting in a high impact on the daily life of patients. Understanding the pathophysiology of PCS is a public health priority, as it still poses a diagnostic and treatment challenge for physicians.

Methods
In this prospective observational cohort study, we analyzed the retinal microcirculation using Retinal Vessel Analysis (RVA) in a cohort of patients with PCS and compared it to an age- and gender-matched healthy cohort (n = 41, matched out of n = 204).

Measurements and main results
PCS patients exhibit persistent endothelial dysfunction (ED), as indicated by significantly lower venular flicker-induced dilation (vFID; 3.42% ± 1.77% vs. 4.64% ± 2.59%; p = 0.02), narrower central retinal artery equivalent (CRAE; 178.1 [167.5–190.2] vs. 189.1 [179.4–197.2], p = 0.01) and lower arteriolar-venular ratio (AVR; (0.84 [0.8–0.9] vs. 0.88 [0.8–0.9], p = 0.007). When combining AVR and vFID, predicted scores reached good ability to discriminate groups (area under the curve: 0.75). Higher PCS severity scores correlated with lower AVR (R = − 0.37 p = 0.017). The association of microvascular changes with PCS severity were amplified in PCS patients exhibiting higher levels of inflammatory parameters.

Conclusion
Our results demonstrate that prolonged endothelial dysfunction is a hallmark of PCS, and impairments of the microcirculation seem to explain ongoing symptoms in patients. As potential therapies for PCS emerge, RVA parameters may become relevant as clinical biomarkers for diagnosis and therapy management.
KW  - Endothelial dysfunction
KW  - Long COVID
KW  - Post-COVID-19 syndrome
KW  - retinal microvasculature
Y1  - 2023
U6  - https://doi.org/10.1007/s10456-023-09885-6
N1  - Corresponding author: Christoph Schmaderer
VL  - 26
SP  - 547
EP  - 563
PB  - Springer Nature
CY  - Dordrecht
ER  - 
TY  - CHAP
A1  - Kubalski, T.
A1  - Marinković, Marko
A1  - Butenweg, Christoph
ED  - Modena, Claudio
T1  - Numerical investigation of masonry infilled R.C. frames
T2  - Brick and Block Masonry. Proceedings of the 16th International Brick and Block Masonry Conference, Padova, Italy, 26-30 June 2016
Y1  - 2016
SN  - 9781315374963
SP  - 1219
EP  - 1226
PB  - CRC Press
CY  - Leiden
ER  - 
TY  - CHAP
A1  - Kubalski, T.
A1  - Butenweg, Christoph
A1  - Marinković, Marko
A1  - Klinkel, S.
T1  - Investigation Of The Seismic Behaviour Of Infill Masonry Using Numerical Modelling Approaches
T2  - 16th World Conference on Earthquake Engineering, 16WCEE 2017 Santiago Chile, January 9th to 13th 2017
N2  - Masonry is a widely spread construction type which is used all over the world for different types of structures. Due to its simple and cheap construction, it is used as non-structural as well as structural element. In frame structures, such as
reinforced concrete frames, masonry may be used as infill. While the bare frame itself is able to carry the loads when it comes to seismic events, the infilled frame is not able to warp freely due to the constrained movement. This restraint results in a complex interaction between the infill and the surrounding frame, which may lead to severe damage to the infill as well as the surrounding frame. The interaction is studied in different projects and effective approaches for the description of the behavior are still lacking. Experimental programs are usually quite expensive, while numerical models, once validated, do offer an efficient approach for the investigation of the interaction when horizontally loaded. In order to study the numerous parameters influencing the seismic load bearing behavior, numerical models may be used. Therefore, this contribution presents a numerical approach for the simulation of infill masonry in reinforced concrete frames. Both parts, the surrounding frame as well as the infill are represented by micro modelling approaches to correctly take into account the different types of failure. The adopted numerical model describes the inelastic behavior of the system, as indicated by the obtained results of the overall structural response as well as the formation of damage in the infilled wall. Comparison of the numerical and experimental results highlights the valuable contribution of numerical simulations in the study and design of infilled frames. As damage of the infill masonry may occur in-plane due to the interaction as well as out-of-plane due to the low vertical load, both directions of loading are investigated.
Y1  - 2017
N1  - Paper No 3064
SP  - 1
EP  - 11
PB  - Chilean Association on Seismology and Earthquake Engineering (ACHISINA)
ER  - 
TY  - JOUR
A1  - Krüger, Götz
A1  - Grötzinger, Joachim
A1  - Berndt, Heinz
T1  - Enantiomeric resolution of amino acid derivatives on chiral stationary phases by high-performance liquid chromatography
JF  - Journal of Chromatography A
Y1  - 1987
U6  - https://doi.org/10.1016/S0021-9673(01)85005-6
SN  - 0021-9673
VL  - 1987
IS  - 397
SP  - 223
EP  - 232
ER  - 
TY  - CHAP
A1  - Krüger, Dirk
A1  - Anthrakidis, Anette
A1  - Fischer, Stephan
A1  - Lokurlu, Ahmet
A1  - Walder, Markus
A1  - Croy, Reiner
A1  - Quaschning, Volker
T1  - Experiences with solar steam supply for an industrial steam network in the P3 Project
T2  - SolarPACES 2009 : electricity, fuels and clean water powered by the sun ; 15 - 18 September 2009, Berlin, Germany ; the 15th SolarPACES conference ; proceedings
Y1  - 2009
SN  - 9783000287558
PB  - Deutsches Zentrum f. Luft- u. Raumfahrt
CY  - Stuttgart
ER  - 
TY  - CHAP
A1  - Krückel, Kai
A1  - Nolden, Florian
A1  - Ferrein, Alexander
A1  - Scholl, Ingrid
T1  - Intuitive visual teleoperation for UGVs using free-look augmented reality displays
T2  - 2015 IEEE International Conference on Robotics and Automation (ICRA), Seattle, WA
Y1  - 2015
U6  - https://doi.org/10.1109/ICRA.2015.7139809
SP  - 4412
EP  - 4417
ER  - 
TY  - JOUR
A1  - Krämer, Stefan
A1  - Daab, Dominique Jonas
A1  - Müller, Brigitte
A1  - Wagner, Tobias
A1  - Baader, Fabian
A1  - Hessel, Joana
A1  - Gdalewitsch, Georg
A1  - Plescher, Engelbert
A1  - Dachwald, Bernd
A1  - Wahle, Michael
A1  - Gierse, Andreas
A1  - Vetter, Rudolf
A1  - Pfützenreuter, Lysan
T1  - Development and flight-testing of a system to isolate vibrations for microgravity experiments on sounding rockets
JF  - 21st ESA Symposium on Rocket and Balloon Research
Y1  - 2013
SP  - 1
EP  - 8
ER  - 
TY  - JOUR
A1  - Krämer, Melina
A1  - Pita, Marcos
A1  - Zhou, Jian
A1  - Ornatska, Maryna
A1  - Poghossian, Arshak
A1  - Schöning, Michael Josef
A1  - Katz, Evgeny
T1  - Coupling of Biocomputing Systems with Electronic Chips: Electronic Interface for Transduction of Biochemical Information
JF  - Journal of Physical Chemistry C: Nanomaterials and Interfaces. 113 (2009), H. 6
Y1  - 2009
SN  - 1932-7455
SP  - 2573
EP  - 2579
PB  - American Cemical Society
CY  - Washington, DC
ER  - 
TY  - JOUR
A1  - Krämer, Marco
A1  - Bongaerts, Johannes
A1  - Bovenberg, Roel
A1  - Kremer, Susanne
A1  - Müller, Ulrike
A1  - Orf, Sonja
A1  - Wubbolts, Marcel
A1  - Raeven, Leon
T1  - Metabolic engineering for microbial production of shikimic acid
JF  - Metabolic engineering
Y1  - 2003
SN  - 1096-7184 (E-Journal); 1096-7176 (Print)
VL  - Vol. 5
IS  - Iss. 4
SP  - 277
EP  - 283
ER  - 
TY  - JOUR
A1  - Krott, Daniel
A1  - Gerhards, Michael
A1  - Skorupa, Sascha
A1  - Sander, Volker
T1  - NHiLA - Bridging the Gap Between .NET and UNICORE
JF  - UNICORE Summit 2011 : proceedings, 7-8 July 2011, Torun, Poland / Mathilde Romberg ... (Eds.)
Y1  - 2011
SN  - 9783893367504
N1  - UNICORE Summit ; (2011 ; 2011.07.07-08 ; Torun) ; Schriften des Forschungszentrums Jülich IAS Series 9
SP  - 77
EP  - 86
PB  - Forschungszentrum Jülich
CY  - Jülich
ER  - 
TY  - CHAP
A1  - Kroniger, Daniel
A1  - Horikawa, Atsushi
A1  - Funke, Harald
A1  - Pfäffle, Franziska
A1  - Kishimoto, Tsuyoshi
A1  - Okada, Koichi
T1  - Experimental and numerical investigation on the effect of pressure on micromix hydrogen combustion
T2  - Conference Proceedings Turbo Expo: Power for Land, Sea and Air, Volume 3A: Combustion, Fuels, and Emissions
N2  - The micromix (MMX) combustion concept is a DLN gas turbine combustion technology designed for high hydrogen content fuels. Multiple non-premixed miniaturized flames based on jet in cross-flow (JICF) are inherently safe against flashback and ensure a stable operation in various operative conditions.

The objective of this paper is to investigate the influence of pressure on the micromix flame with focus on the flame initiation point and the NOx emissions. A numerical model based on a steady RANS approach and the Complex Chemistry model with relevant reactions of the GRI 3.0 mechanism is used to predict the reactive flow and NOx emissions at various pressure conditions. Regarding the turbulence-chemical interaction, the Laminar Flame Concept (LFC) and the Eddy Dissipation Concept (EDC) are compared. The numerical results are validated against experimental results that have been acquired at a high pressure test facility for industrial can-type gas turbine combustors with regard to flame initiation and NOx emissions.

The numerical approach is adequate to predict the flame initiation point and NOx emission trends. Interestingly, the flame shifts its initiation point during the pressure increase in upstream direction, whereby the flame attachment shifts from anchoring behind a downstream located bluff body towards anchoring directly at the hydrogen jet. The LFC predicts this change and the NOx emissions more accurately than the EDC. The resulting NOx correlation regarding the pressure is similar to a non-premixed type combustion configuration.
KW  - NOx emissions
KW  - hydrogen
KW  - combustor
KW  - gas turbine
Y1  - 2021
U6  - https://doi.org/10.1115/GT2021-58926
N1  - ASME Turbo Expo 2021: Turbomachinery Technical Conference and Exposition, June 7–11, 2021, Virtual, Online.

Paper No: GT2021-58926, V03AT04A025
PB  - ASME
CY  - New York, NY
ER  - 
TY  - CHAP
A1  - Kroniger, Daniel
A1  - Horikawa, Atsushi
A1  - Funke, Harald
A1  - Pfäffle, Franziska
T1  - Numerical investigation of micromix hydrogen flames at different combustor pressure levels
T2  - The Proceedings of the International Conference on Power Engineering (ICOPE)
N2  - This study investigates the influence of pressure on the temperature distribution of the micromix (MMX) hydrogen flame and the NOx emissions. A steady computational fluid dynamic (CFD) analysis is performed by simulating a reactive flow with a detailed chemical reaction model. The numerical analysis is validated based on experimental investigations. A quantitative correlation is parametrized based on the numerical results. We find, that the flame initiation point shifts with increasing pressure from anchoring behind a downstream located bluff body towards anchoring upstream at the hydrogen jet. The numerical NOx emissions trend regarding to a variation of pressure is in good agreement with the experimental results. The pressure has an impact on both, the residence time within the maximum temperature region and on the peak temperature itself. In conclusion, the numerical model proved to be adequate for future prototype design exploration studies targeting on improving the operating range.
KW  - Gas turbine combustion
KW  - Hydrogen
KW  - NOx emissions
KW  - Flame temperature
KW  - Flame residence time
Y1  - 2021
U6  - https://doi.org/10.1299/jsmeicope.2021.15.2021-0237
N1  - International Conference on Power Engineering 2021 (ICOPE-2021). October 17 - 21, 2021. Kobe, Japan (Online)
ER  - 
TY  - JOUR
A1  - Kronhardt, Valentina
A1  - Alexopoulos, Spiros
A1  - Reißel, Martin
A1  - Sattler, Johannes Christoph
A1  - Hoffschmidt, Bernhard
A1  - Hänel, Matthias
A1  - Doerbeck, Till
T1  - High-temperature thermal storage system for solar tower power plants with open-volumetric air receiver simulation and energy balancing of a discretized model
JF  - Energy procedia
N2  - This paper describes the modeling of a high-temperature storage system for an existing solar tower power plant with open volumetric receiver technology, which uses air as heat transfer medium (HTF). The storage system model has been developed in the simulation environment Matlab/Simulink®. The storage type under investigation is a packed bed thermal energy storage system which has the characteristics of a regenerator. Thermal energy can be stored and discharged as required via the HTF air. The air mass flow distribution is controlled by valves, and the mass flow by two blowers. The thermal storage operation strategy has a direct and significant impact on the energetic and economic efficiency of the solar tower power plants.
Y1  - 2014
U6  - https://doi.org/10.1016/j.egypro.2014.03.094
SN  - 1876-6102 (E-Journal) ; 1876-6102 (Print)
VL  - 49
SP  - 870
EP  - 877
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Kronhardt, Valentina
A1  - Alexopoulos, Spiros
A1  - Reißel, Martin
A1  - Latzke, Markus
A1  - Rendon, C.
A1  - Sattler, Johannes Christoph
A1  - Herrmann, Ulf
T1  - Simulation of operational management for the Solar Thermal Test and Demonstration Power Plant Jülich using optimized control strategies of the storage system
T2  - Energy procedia
Y1  - 2015
SN  - 1876-6102
SP  - 1
EP  - 6
ER  - 
TY  - CHAP
A1  - Krome, Cornelia
A1  - Sander, Volker
T1  - Time series analysis with apache spark and its applications to energy informatics
T2  - Proceedings of the 7th DACH+ Conference on Energy Informatics
N2  - In energy economy forecasts of different time series are rudimentary. In this study, a prediction for the German day-ahead spot market is created with Apache Spark and R. It is just an example for many different applications in virtual power plant environments. Other examples of use as intraday price processes, load processes of machines or electric vehicles, real time energy loads of photovoltaic systems and many more time series need to be analysed and predicted.

This work gives a short introduction into the project where this study is settled. It describes the time series methods that are used in energy industry for forecasts shortly. As programming technique Apache Spark, which is a strong cluster computing technology, is utilised. Today, single time series can be predicted. The focus of this work is on developing a method to parallel forecasting, to process multiple time series simultaneously with R and Apache Spark.
Y1  - 2018
U6  - https://doi.org/10.1186/s42162-018-0043-1
N1  - Energy Informatics 2018, Volume 1 Supplement 1
ER  - 
TY  - JOUR
A1  - Krome, Cornelia
A1  - Höft, Jan
A1  - Sander, Volker
T1  - Clustering time series applied to energy markets
JF  - Energy Informatics
Y1  - 2019
U6  - https://doi.org/10.1186/s42162-019-0076-0
SN  - 2520-8942
VL  - 2
IS  - Article numer 17
SP  - 1
EP  - 20
PB  - Springer
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Kroll-Ludwigs, Kathrin
T1  - Names of individuals
T2  - European Encyclopedia of Private International Law
Y1  - 2017
SN  - 9781782547228
PB  - Edward Elgar Publishing
CY  - Cheltenham, UK
ER  - 
TY  - CHAP
A1  - Kroll-Ludwigs, Kathrin
T1  - Small Claims Regulation
T2  - European Encyclopedia of Private International Law
Y1  - 2017
SN  - 9781782547228
PB  - Edward Elgar Publishing
CY  - Cheltenham, UK
ER  - 
TY  - CHAP
A1  - Kroll-Ludwigs, Kathrin
ED  - Calliess, Gralf-Peter
T1  - Art. 5 Rom III-Regulation (choice of applicable law by the parties)
T2  - Rome Regulations : commentary
Y1  - 2015
SN  - 9789041147547
PB  - Wolters Kluwer
ET  - 2nd ed.
ER  - 
TY  - CHAP
A1  - Kroll-Ludwigs, Kathrin
ED  - Colliess, Gralf-Peter
T1  - Art. 7 Rome III-Regulation (formal validity)
T2  - Rome Regulations :  commentary
Y1  - 2015
SN  - 9789041147547
PB  - Wolters Kluwer
ET  - 2nd ed.
ER  - 
TY  - JOUR
A1  - Kroll-Ludwigs, Kathrin
T1  - The Reform of German Maintenance Law
JF  - The International Survey of Family Law
Y1  - 2018
SP  - 85
EP  - 100
ER  - 
TY  - CHAP
A1  - Kroll-Ludwigs, Kathrin
ED  - Boele-Woelki, Katharina
T1  - Unification of Conflict of Laws in Europe. Matrimonial Property Regimes
T2  - European Challenges in Contemporary Family Law
Y1  - 2008
SN  - 978-90-5095-692-5
SP  - 379
EP  - 393
PB  - Intersentia
CY  - Antwerpen
ER  - 
TY  - CHAP
A1  - Kroker, Jan
A1  - Hoffschmidt, Bernhard
A1  - Schwarzer, Klemens
A1  - Späte, Frank
T1  - PTC 1000 modular parabolic trough collector
T2  - Process heat collectors : state of the art within task 33/IV ; IEA SHC-Task 33 and SolarPACES-Task IV: Solar heat for industrial processes : Förderkennzeichen BMBF 0329273A / Solar Heating and Cooling Executive Committee of the International Energy Agency (IEA) ; ed. Werner Weiss
Y1  - 2008
SP  - 45
EP  - 46
PB  - AEE INTEC
CY  - Gleisdorf
ER  - 
TY  - CHAP
A1  - Kroggel, Matthias
A1  - Berndt, Heinz
ED  - Ragnarsson, Ulf
T1  - The 0-hydroxiphenyloxicarbonyl-group a new base labile amine protecting group
T2  - Peptides 1984 : Proceedings of the 18th European Peptide Symposium Djurönäset, Sweden, June 10 - 15, 1984
Y1  - 1984
SN  - 91-22-00715-6
SP  - 81
EP  - 83
PB  - Almquist & Wiksell
CY  - Stockholm
ER  - 
TY  - JOUR
A1  - Kreyer, Jörg
A1  - Müller, Marvin
A1  - Esch, Thomas
T1  - A Calculation Methodology for Predicting Exhaust Mass Flows and Exhaust Temperature Profiles for Heavy-Duty Vehicles
JF  - SAE International Journal of Commercial Vehicles
N2  - The predictive control of commercial vehicle energy management systems, such as vehicle thermal management or waste heat recovery (WHR) systems, are discussed on the basis of information sources from the field of environment recognition and in combination with the determination of the vehicle system condition.
In this article, a mathematical method for predicting the exhaust gas mass flow and the exhaust gas temperature is presented based on driving data of a heavy-duty vehicle. The prediction refers to the conditions of the exhaust gas at the inlet of the exhaust gas recirculation (EGR) cooler and at the outlet of the exhaust gas aftertreatment system (EAT). The heavy-duty vehicle was operated on the motorway to investigate the characteristic operational profile. In addition to the use of road gradient profile data, an evaluation of the continuously recorded distance signal, which represents the distance between the test vehicle and the road user ahead, is included in the prediction model. Using a Fourier analysis, the trajectory of the vehicle speed is determined for a defined prediction horizon.
To verify the method, a holistic simulation model consisting of several hierarchically structured submodels has been developed. A map-based submodel of a combustion engine is used to determine the EGR and EAT exhaust gas mass flows and exhaust gas temperature profiles. All simulation results are validated on the basis of the recorded vehicle and environmental data. Deviations from the predicted values are analyzed and discussed.
Y1  - 2020
U6  - https://doi.org/10.4271/02-13-02-0009
SN  - 1946-3928
VL  - 13
IS  - 2
SP  - 129
EP  - 143
PB  - SAE International
CY  - Warrendale, Pa.
ER  - 
TY  - CHAP
A1  - Kreyer, Jörg
A1  - Müller, Marvin
A1  - Esch, Thomas
T1  - A Map-Based Model for the Determination of Fuel Consumption for Internal Combustion Engines as a Function of Flight Altitude
N2  - In addition to very high safety and reliability requirements, the design of internal combustion engines (ICE) in aviation focuses on economic efficiency. The objective must be to design the aircraft powertrain optimized for a specific flight mission with respect to fuel consumption and specific engine power. Against this background, expert tools provide valuable decision-making assistance for the customer. In this paper, a mathematical calculation model for the fuel consumption of aircraft ICE is presented. This model enables the derivation of fuel consumption maps for different engine configurations. Depending on the flight conditions and based on these maps, the current and the integrated fuel consumption for freely definable flight emissions is calculated. For that purpose, an interpolation method is used, that has been optimized for accuracy and calculation time. The mission boundary conditions flight altitude and power requirement of the ICE form the basis for this calculation. The mathematical fuel consumption model is embedded in a parent program. This parent program presents the simulated fuel consumption by means of an example flight mission for a representative airplane. The focus of the work is therefore on reproducing exact consumption data for flight operations. By use of the empirical approaches according to Gagg-Farrar [1] the power and fuel consumption as a function of the flight altitude are determined. To substantiate this approaches, a 1-D ICE model based on the multi-physical simulation tool GT-Suite® has been created. This 1-D engine model offers the possibility to analyze the filling and gas change processes, the internal combustion as well as heat and friction losses for an ICE under altitude environmental conditions. Performance measurements on a dynamometer at sea level for a naturally aspirated ICE with a displacement of 1211 ccm used in an aviation aircraft has been done to validate the 1-D ICE model. To check the plausibility of the empirical approaches with respect to the fuel consumption and performance adjustment for the flight altitude an analysis of the ICE efficiency chain of the 1-D engine model is done. In addition, a comparison of literature and manufacturer data with the simulation results is presented.
Y1  - 2020
U6  - https://doi.org/10.25967/490162
N1  - 68. Deutscher Luft- und Raumfahrtkongress 30.09.-02.10.2019, Darmstadt
PB  - DGLR
CY  - Bonn
ER  - 
TY  - CHAP
A1  - Kreyer, Jörg
A1  - Esch, Thomas
T1  - Simulation Tool for Predictive Control Strategies for an ORCSystem in Heavy Duty Vehicles
T2  - European GT Conference 2017
N2  - Scientific questions
- How can a non-stationary heat offering in the commercial vehicle be used to reduce fuel consumption?
- Which potentials offer route and environmental information among with predicted speed and load trajectories to increase the efficiency of a ORC-System?
Methods
- Desktop bound holistic simulation model for a heavy duty truck incl. an ORC System
- Prediction of massflows, temperatures and mixture quality (AFR) of exhaust gas
Y1  - 2017
N1  - European GT Conference 2017, 9.-10. Oktober 2017, Frankfurt a.M.
ER  - 
TY  - CHAP
A1  - Kreutz, Christian
A1  - Lörgen, Jürgen
A1  - Graewe, Boris
A1  - Bargon, Joachim
A1  - Yoshida, Mayumi
A1  - Freso, Zachary M.
A1  - Frèchet, Jean M. J.
T1  - High frequency quartz micro balances: a promising path to enhanced sensitivity of gravimetric sensors
N2  - An array of 50 MHz quartz microbalances (QMBs) coated with a dendronized polymer was used to detect small amounts of volatile organic compounds (VOCs) in the gas phase. The results were compared to those obtained with the commonly used 10 MHz QMBs. The 50 MHz QMBs proved to be a powerful tool for the detection of VOCs in the gas phase; therefore, they represent a promising alternative to the much more delicate surface acoustic wave devices (SAWs).
KW  - Biosensor
KW  - Quartz micro balances
KW  - electronic noses dendronized polymers inverted mesa technology
Y1  - 2006
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:a96-opus-1445
ER  - 
TY  - CHAP
A1  - Kremers, Alexander
A1  - Pieper, Martin
T1  - Simulation and Verification of Bionic Heat Exchangers with COMSOL Multiphysics® Software
T2  - COMSOL Conference 2015 User Presentations ; COMSOL Conference 2015 Grenoble October 14 - 16, 2015 - World Trade Center, Grenoble, France
Y1  - 2015
PB  - COMSOL
CY  - Göttingen ; Berlin
ER  - 
TY  - JOUR
A1  - Krebsbach, M.
A1  - Schiller, C.
A1  - Brunner, D.
A1  - Günther, G.
A1  - Hegglin, M. I.
A1  - Mottaghy, Darius
A1  - Riese, M.
A1  - Spelten, N.
A1  - Wernli, H.
T1  - Seasonal cycles and variability of O_3 and H_2O in the UT/LMS during SPURT
JF  - Atmospheric Chemistry and Physics
Y1  - 2006
U6  - https://doi.org/10.5194/acp-6-109-2006
VL  - 6
IS  - 1
SP  - 109
EP  - 125
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Schuppe, W.D.
A1  - Saure, M.
A1  - Andress, H.
T1  - Sensitive Analytical and Physical Methods for Diagnosis of Variations in Polyolefin Plaques and Cable Insulations / W.D. Schuppe, M. Saure, H. Andress, K. Möller, D. Meurer, G. Krause
JF  - Proceedings of the 32nd session : 28th August - 3rd September.
Y1  - 1988
N1  - International Conference on Large Electric Systems, CIGRÉ <32, Paris, 1988>
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Rodriguez, Jackson
A1  - Stopic, Srecko
A1  - Friedrich, Bernd
T1  - Feasibility assessment of electrocoagulation towards a new sustainable wastewater treatment / Rodriguez, Jackson ; Stopic, Srecko ; Krause Gregor ; Friedrich, Bernd
JF  - Environmental Science and Pollution Research. 14 (2007), H. 7
Y1  - 2007
SN  - 0944-1344
SP  - 477
EP  - 482
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Neubert, R.
A1  - Pietsch, R.
T1  - Investigations of Electrical Aging in Polymers under High AC-Field Strength
JF  - 1990 annual report : October 28 - October 31, 1990 / sponsored by the IEEE Dielectrics and Electrical Insulation Society
Y1  - 1990
N1  - Conference on Electrical Insulation and Dielectric Phenomena ; (59, 1990, Pocono Manor, Pa.)
PB  - IEEE Service Center
CY  - Piscataway, N.J
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Möller, K.
A1  - Meurer, D.
T1  - Dielectric phenomena in semicrystalline polymers
JF  - IEEE Transaction on Electrical Insulation. Vol. 24 (1989), H. No. 2
Y1  - 1989
N1  - Digital Object Identifier 10.1109/14.90276
SP  - 215
EP  - 222
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Meurer, D.
A1  - Klee, D.
T1  - Space Charge Formation Related to the Morphology of Polymers
JF  - ISE 6 : 6th International symposium on electrets : Papers
Y1  - 1988
N1  - International Symposium on Electrets <6, 1988, Oxford>
PB  - IEEE
CY  - Piscataway, NY
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Meurer, D.
A1  - Klee, D.
T1  - Space charge formation related to the morphology of polymers
JF  - IEEE Transaction on Electrical Insulation. Vol. 24 (1989), H. No. 3
Y1  - 1989
N1  - Digital Object Identifier 10.1109/14.30883
SP  - 215
EP  - 222
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Göttlich, S.
A1  - Möller, K.
A1  - Meurer, D.
T1  - Space Charge Phenomena in Partially Crystalline Polymers: On-Line Measurement of Charge Carrier Motion under High AC-Field Strength / G. Krause, S. Göttlich, K. Möller, D. Meurer
JF  - Proceedings of the 3rd International Conference on Conduction and Breakdown in Solid Dielectrics : Trondheim, Norway ... 1989
Y1  - 1989
N1  - International Conference on Conduction and Breakdown in Solid Dielectrics <3, 1989, Trondheim>
PB  - IEEE
CY  - Piscataway, N.J.
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Fruth, Bernhard
T1  - Dielectric Properties of Polyolefins Stressed by High Electrical Fields. Fruth, B. ; Krause, G.
Y1  - 1987
N1  - Fifth International Symposium on High Voltage Engineering : Proceedings; Braunschweig, Stadthalle, August, 24-28, 1987 / International Symposium on High Voltage Engineering <5, 1987, Braunschweig>
ER  - 
TY  - JOUR
A1  - Krause, Gregor
A1  - Fruth, B.
T1  - Dielectric Properties of Polyolefins Stressed by High Electrical Fields / Fruth, B. ; Krause, G.
JF  - Plenary lectures and contributions presented at the International Symposium on Polymer Materials : held in San Sebastian (Donostia), Spain, 31 August - 4 September, 1987 / symposium ed. G. M. Guzmán ; A. Santamaria
Y1  - 1988
SN  - 3-85739-220-7
N1  - International Symposium on Polymer Materials <1987, San Sebastián, Golfo de Vizcaya>
PB  - Huethig & Wepf
CY  - Basel
ER  - 
TY  - JOUR
A1  - Krause, Gregor
T1  - High Field Phenomena of Polymeric Insulation Investigated at PE Needle-Plane Specimen
JF  - Seventh International Symposium on High Voltage Engineering : Dresden, August 26 - 30, 1991 / Technische Universität Dresden
Y1  - 1991
N1  - International Symposium on High Voltage Engineering ; (7, 1991, Dresden); International Symposium on High Voltage Engineering (ISH) ; (7 : ; 1991.08.26-30 : ; Dresden)
PB  - TU Dresden
CY  - Dresden
ER  - 
TY  - CHAP
A1  - Kramer, Pia
A1  - Bragard, Michael
A1  - Ritz, Thomas
A1  - Ferfer, Ute
A1  - Schiffers, Tim
T1  - Visualizing, Enhancing and Predicting Students’ Success through ECTS Monitoring
T2  - 2024 IEEE Global Engineering Education Conference (EDUCON)
N2  - This paper serves as an introduction to the ECTS monitoring system and its potential applications in higher education. It also emphasizes the potential for ECTS monitoring to become a proactive system, supporting students by predicting academic success and identifying groups of potential dropouts for tailored support services. The use of the nearest neighbor analysis is suggested for improving data analysis and prediction accuracy.
KW  - Monitoring
KW  - Engineering education
KW  - Data visualization
KW  - Accuracy
KW  - Data analysis
Y1  - 2024
U6  - https://doi.org/10.1109/EDUCON60312.2024.10578652
SN  - 2165-9559
SN  - 2165-9567 (eISSN)
N1  - 2024 IEEE Global Engineering Education Conference (EDUCON), 08-11 May 2024, Kos Island, Greece
PB  - IEEE
CY  - New York, NY
ER  - 
TY  - JOUR
A1  - Kramer, Matthias
A1  - Valero, Daniel
A1  - Chanson, Hubert
A1  - Bung, Daniel Bernhard
T1  - Towards reliable turbulence estimations with phase-detection probes: an adaptive window cross-correlation technique
JF  - Experiments in Fluids
Y1  - 2019
U6  - https://doi.org/10.1007/s00348-018-2650-9
SN  - 1432-1114
VL  - 60
EP  - Article number 2
PB  - Springer
CY  - Berlin
ER  - 
TY  - JOUR
A1  - Kramer, Friederike
A1  - Halamkova, Lenka
A1  - Poghossian, Arshak
A1  - Schöning, Michael Josef
A1  - Katz, Evgeny
A1  - Halamek, Jan
T1  - Biocatalytic analysis of biomarkers for forensic identification of ethnicity between Caucasian and African American
JF  - The analyst. August 2013
Y1  - 2013
SN  - 1364-5528 (E-Journal); 0003-2654 (Print)
VL  - Vol. 138
SP  - 6251
EP  - 6257
PB  - Royal Society of Chemistry
CY  - Cambridge
ER  - 
TY  - CHAP
A1  - Kraft, Bodo
A1  - Wilhelms, Nils
T1  - Visual Knowledge Specification for Conceptual Design
N2  - Proc. of the 2005 ASCE Intl. Conf. on Computing in Civil Engineering (ICCC 2005) eds. L. Soibelman und F. Pena-Mora, Seite 1-14, ASCE (CD-ROM), Cancun, Mexico, 2005 Current CAD tools are not able to support the fundamental conceptual design phase, and none of them provides consistency analyses of sketches produced by architects. To give architects a greater support at the conceptual design phase, we develop a CAD tool for conceptual design and a knowledge specification tool allowing the definition of conceptually relevant knowledge. The knowledge is specific to one class of buildings and can be reused. Based on a dynamic knowledge model, different types of design rules formalize the knowledge in a graph-based realization. An expressive visual language provides a user-friendly, human readable representation. Finally, consistency analyses enable conceptual designs to be checked against this defined knowledge. In this paper we concentrate on the knowledge specification part of our project.
KW  - CAD
KW  - CAD
KW  - Bauingenieurwesen
KW  - CAD
KW  - civil engineering
Y1  - 2005
ER  - 
TY  - CHAP
A1  - Kraft, Bodo
A1  - Wilhelms, N.
T1  - Interactive distributed knowledge support for conceptual building design
N2  - In: Net-distributed Co-operation : Xth International Conference on Computing in Civil and Building Engineering, Weimar, June 02 - 04, 2004 ; proceedings / [ed. by Karl Beuke ...] . - Weimar: Bauhaus-Univ. Weimar 2004. - 1. Aufl. . Seite 1-14 ISBN 3-86068-213-X International Conference on Computing in Civil and Building Engineering <10, 2004, Weimar> Summary In our project, we develop new tools for the conceptual design phase. During conceptual design, the coarse functionality and organization of a building is more important than a detailed worked out construction. We identify two roles, first the knowledge engineer who is responsible for knowledge definition and maintenance; second the architect who elaborates the conceptual de-sign. The tool for the knowledge engineer is based on graph technology, it is specified using PROGRES and the UPGRADE framework. The tools for the architect are integrated to the in-dustrial CAD tool ArchiCAD. Consistency between knowledge and conceptual design is en-sured by the constraint checker, another extension to ArchiCAD.
KW  - CAD
KW  - CAD
KW  - Bauingenieurwesen
KW  - CAD
KW  - civil engineering
Y1  - 2004
SN  - 3-86068-213-X
ER  - 
TY  - CHAP
A1  - Kraft, Bodo
A1  - Schneider, Gerd
T1  - Semantic Roomobjects for Conceptual Design Support : A Knowledge-based Approach
N2  - In: Computer Aided Architectural Design Futures 2005 2005, Part 4, 207-216, DOI: http://dx.doi.org/10.1007/1-4020-3698-1_19 The conceptual design at the beginning of the building construction process is essential for the success of a building project. Even if some CAD tools allow elaborating conceptual sketches, they rather focus on the shape of the building elements and not on their functionality. We introduce semantic roomobjects and roomlinks, by way of example to the CAD tool ArchiCAD. These extensions provide a basis for specifying the organisation and functionality of a building and free architects being forced to directly produce detailed constructive sketches. Furthermore, we introduce consistency analyses of the conceptual sketch, based on an ontology containing conceptual relevant knowledge, specific to one class of buildings.
KW  - CAD
KW  - CAD
KW  - Bauingenieurwesen
KW  - CAD
KW  - civil engineering
Y1  - 2005
SN  - 978-1-4020-3460-2
ER  - 
TY  - CHAP
A1  - Kraft, Bodo
A1  - Retkowitz, Daniel
T1  - Rule-Dependencies for Visual Knowledge Specification in Conceptual Design
N2  - In: Proc. of the 11th Intl. Conf. on Computing in Civil and Building Engineering (ICCCBE-XI) ed. Hugues Rivard, Montreal, Canada, Seite 1-12, ACSE (CD-ROM), 2006 Currently, the conceptual design phase is not adequately supported by any CAD tool. Neither the support while elaborating conceptual sketches, nor the automatic proof of correctness with respect to effective restrictions is currently provided by any commercial tool. To enable domain experts to store the common as well as their personal domain knowledge, we develop a visual language for knowledge formalization. In this paper, a major extension to the already existing concepts is introduced. The possibility to define rule dependencies extends the expressiveness of the knowledge definition language and contributes to the usability of our approach.
KW  - CAD
KW  - CAD
KW  - Bauingenieurwesen
KW  - CAD
KW  - civil engineering
Y1  - 2006
ER  - 
TY  - JOUR
A1  - Kraft, Bodo
A1  - Nobisrath, Ulrich
A1  - Salumaa, Priit
A1  - Schultchen, Erhard
T1  - Fujaba based Tool Development for eHome Systems / Nobisrath, Ulrich ; Salumaa, Priit ; Schultchen, Erhard ; Kraft, Bodo
JF  - Electronic Notes in Theoretical Computer Science. 127 (2004), H. 1
Y1  - 2004
SN  - 1571-0661
N1  - Proceedings of the International Workshop on Graph-Based Tools (GraBaTs 2004)
SP  - 89
EP  - 99
ER  - 
TY  - JOUR
A1  - Kraft, Bodo
A1  - Nagl, Manfred
T1  - Visual Knowledge Specification for Conceptual Design: Definition and Tool Support
N2  - In: Advanced Engineering Informatics. Vol 21, Issue 1, 2007, Pages 67-83 http://dx.doi.org/10.1016/j.aei.2006.10.001 eds. J.C. Kunz, I.F.C. Smith and T. Tomiyama, Elsevier, Seite 1-22 Current CAD tools are not able to support the conceptual design phase, and none of them provides a consistency analysis for sketches produced by architects. This phase is fundamental and crucial for the whole design and construction process of a building. To give architects a better support, we developed a CAD tool for conceptual design and a knowledge specification tool. The knowledge is specific to one class of buildings and it can be reused. Based on a dynamic and domain-specific knowledge ontology, different types of design rules formalize this knowledge in a graph-based form. An expressive visual language provides a user-friendly, human readable representation. Finally, a consistency analysis tool enables conceptual designs to be checked against this formal conceptual knowledge. In this article, we concentrate on the knowledge specification part. For that, we introduce the concepts and usage of a novel visual language and describe its semantics. To demonstrate the usability of our approach, two graph-based visual tools for knowledge specification and conceptual design are explained.
KW  - CAD
KW  - CAD
KW  - Bauingenieurwesen
KW  - CAD
KW  - civil engineering
Y1  - 2007
ER  - 
TY  - CHAP
A1  - Kraft, Bodo
A1  - Nagl, Manfred
T1  - Semantic tool support for conceptual design
N2  - ITCE-2003 - 4th Joint Symposium on Information Technology in Civil Engineering ed Flood, I., Seite 1-12, ASCE (CD-ROM), Nashville, USA In this paper we discussed graph based tools to support architects during the conceptual design phase. Conceptual Design is defined before constructive design; the used concepts are more abstract. We develop two graph based approaches, a topdown using the graph rewriting system PROGRES and a more industrially oriented approach, where we extend the CAD system ArchiCAD. In both approaches, knowledge can be defined by a knowledge engineer, in the top-down approach in the domain model graph, in the bottom-up approach in the in an XML file. The defined knowledge is used to incrementally check the sketch and to inform the architect about violations of the defined knowledge. Our goal is to discover design error as soon as possible and to support the architect to design buildings with consideration of conceptual knowledge.
KW  - CAD
KW  - CAD
KW  - Bauingenieurwesen
KW  - CAD
KW  - civil engineering
Y1  - 2003
ER  - 
TY  - CHAP
A1  - Kraft, Bodo
A1  - Meyer, Oliver
A1  - Nagl, Manfred
T1  - Graph technology support for conceptual design in civil engineering
N2  - In: Advances in intelligent computing in engineering : proceedings of the 9.International EG-ICE Workshop ; Darmstadt, (01 - 03 August) 2002 / Martina Schnellenbach-Held ... (eds.) . - Düsseldorf: VDI-Verl., 2002 .- Fortschritt-Berichte VDI, Reihe 4, Bauingenieurwesen ; 180 ; S. 1-35 The paper describes a novel way to support conceptual design in civil engineering. The designer uses semantical tools guaranteeing certain internal structures of the design result but also the fulfillment of various constraints. Two different approaches and corresponding tools are discussed: (a) Visually specified tools with automatic code generation to determine a design structure as well as fixing various constraints a design has to obey. These tools are also valuable for design knowledge specialist. (b) Extensions of existing CAD tools to provide semantical knowledge to be used by an architect. It is sketched how these different tools can be combined in the future. The main part of the paper discusses the concepts and realization of two prototypes following the two above approaches. The paper especially discusses that specific graphs and the specification of their structure are useful for both tool realization projects.
KW  - CAD
KW  - CAD ;
KW  - CAD
KW  - civil engineering
Y1  - 2002
SN  - 3-18-318004-9
ER  - 
TY  - JOUR
A1  - Kraft, Bodo
A1  - Heer, Thomas
A1  - Retkowitz, Daniel
T1  - Incremental Ontology Integration / Heer, Thomas ; Retkowitz, Daniel ; Kraft, Bodo
JF  - Proceedings of the 10th International Conference on Enterprise Information Systems : Barcelona, Spain, June 12 - 16, 2008 / organized by INSTICC, Institute for Systems and Technologies of Information, Control and Communication ... [Ed. by José Cordeiro ...]
Y1  - 2008
N1  - International Conference on Enterprise Information Systems ; (10 : ; 2008.06.12-16 : ; Barcelona) ; ICEIS ; (10 : ; 2008.06.12-16 : ; Barcelona)
SP  - 13
EP  - 28
PB  - INSTICC
CY  - Setubal
ER  - 
TY  - JOUR
A1  - Kraft, Bodo
A1  - Heer, Thomas
A1  - Retkowitz, Daniel
T1  - Algorithm and Tool for Ontology Integration Based on Graph Rewriting / Heer, Thomas ; Retkowitz, Daniel ; Kraft, Bodo
JF  - Applications of Graph Transformations with Industrial Relevance / Third International Symposium, AGTIVE 2007, Kassel, Germany, October 10-12, 2007, Revised Selected and Invited Papers
Y1  - 2008
SN  - 978-3-540-89019-5
N1  - Lecture Notes in Computer Science ; 5088
SP  - 577
EP  - 582
ER  - 
TY  - CHAP
A1  - Kraft, Bodo
T1  - Conceptual design tools for civil engineering
N2  - Applications of Graph Transformations with Industrial Relevance Lecture Notes in Computer Science, 2004, Volume 3062/2004, 434-439, DOI: http://dx.doi.org/10.1007/978-3-540-25959-6_33 This paper gives a brief overview of the tools we have developed to support conceptual design in civil engineering. Based on the UPGRADE framework, two applications, one for the knowledge engineer and another for architects allow to store domain specific knowledge and to use this knowledge during conceptual design. Consistency analyses check the design against the defined knowledge and inform the architect if rules are violated.
KW  - CAD
KW  - CAD
KW  - Bauingenieurwesen
KW  - CAD
KW  - civil engineering
Y1  - 2004
ER  - 
TY  - GEN
A1  - Krafft, Simone
A1  - Kuka, Katrin
A1  - Ulber, Roland
A1  - Tippkötter, Nils
T1  - Utilization of Lolium perenne varieties as a renewable substrate for single-cell proteins, lactate, and composite materials
T2  - Chemie Ingenieur Technik
N2  - Lolium perenne (perennial ryegrass) is aproductive and high-quality forage grass indigenous to Southern Europe, temperate Asia, and North Africa. Nowadays it is widespread and the dominant grass species on green areas in temperate climates. This abundant source of biomass is suitable for the development of bioeconomic processes because of its high cellulose and water-soluble carbohydrate content. In this work, novel breeds of the perennial ryegrass are being examined with regards to their quality parameters and biotechnological utilization options within the context of bioeconomy. Three processing operations are presented. In the first process, the perennial ryegrass is pretreated by pressing or hydrothermal extraction to derive glucosevia subsequent enzymatic hydrolysis of cellulose. A yield of up to 82 % glucose was achieved when using the hydrothermal ex-traction as pretreatment. In a second process, the ryegrass is used to produce lactic acid in high concentrations. The influence of the growth conditions and the cutting time on the carboxylic acid yield is investigated. A yield of lactic acid of above 150 g kg⁻¹  dry matter was achieved. The third process is to use Lolium perenne as a substrate in the fermentation of K. marxianus for the microbial production of single-cell proteins. The perennial ryegrass is screw-pressed and the press juice is used as medium. When supplementing the press juice with yeast media components, a biomass concentration of up to 16 g L⁻¹ could be achieved.
Y1  - 2022
U6  - https://doi.org/10.1002/cite.202255306
SN  - 0009-286X
SN  - 1522-2640 (eISSN)
N1  - ProcessNet and DECHEMA‐BioTechNet Jahrestagungen 2022 together with 13th ESBES Symposium 2022, 12. - 15. September 2022, Eurogress Aachen
VL  - 94
IS  - 9
SP  - 1303
EP  - 1304
PB  - Wiley-VCH
CY  - Weinheim
ER  - 
TY  - JOUR
A1  - Krafft, B.
A1  - Förster, Arnold
A1  - Hart, A. van der
A1  - Schäpers, T.
T1  - Control of Aharonov-Bohm oscillations in a AlGaAs/GaAs ring by asymmetric and symmetric gate biasing
JF  - Physica E: Low-dimensional Systems and Nanostructures. 9 (2001), H. 4
Y1  - 2001
SN  - 1386-9477
SP  - 635
EP  - 641
ER  - 
TY  - JOUR
A1  - Kraff, Oliver
A1  - Wrede, Karsten H.
A1  - Schoemberg, Tobias
A1  - Dammann, Philipp
A1  - Noureddine, Yacine
A1  - Orzada, Stephan
A1  - Ladd, Mark E.
A1  - Bitz, Andreas
T1  - MR safety assessment of potential RF heating from cranial fixation plates at 7 T
JF  - Medical Physics
Y1  - 2013
U6  - https://doi.org/10.1118/1.4795347
SN  - 2473-4209
VL  - 40
IS  - 4
SP  - 042302-1
EP  - 042302-10
PB  - Wiley
CY  - Hoboken
ER  - 
TY  - JOUR
A1  - Kraff, Oliver
A1  - Bitz, Andreas
A1  - Kruszona, Stefan
A1  - Orzada, Stephan
A1  - Schaefer, Lena C.
A1  - Theysohn, Jens M.
A1  - Maderwald, Stefan
A1  - Ladd, Mark E.
A1  - Quick, Harald H.
T1  - An eight-channel phased array RF coil for spine MR imaging at 7 T
JF  - Investigative Radiology
Y1  - 2009
U6  - https://doi.org/10.1097/RLI.0b013e3181b24ab7
SN  - 1536-0210
VL  - 44
IS  - 11
SP  - 734
EP  - 740
PB  - Lippincott Williams & Wilkins
ER  - 
TY  - JOUR
A1  - Kraff, Oliver
A1  - Bitz, Andreas
A1  - Dammann, Philipp
A1  - Ladd, Susanne C.
A1  - Ladd, Mark E.
A1  - Quick, Harald H.
T1  - An eight-channel transmit/receive multipurpose coil for musculoskeletal MR imaging at 7 T
JF  - Medical Physics
N2  - Purpose:
MRI plays a leading diagnostic role in assessing the musculoskeletal (MSK) system and is well established for most questions at clinically used field strengths (up to 3 T). However, there are still limitations in imaging early stages of cartilage degeneration, very fine tendons and ligaments, or in locating nerve lesions, for example. 7 T MRI of the knee has already received increasing attention in the current published literature, but there is a strong need to develop new radiofrequency (RF) coils to assess more regions of the MSK system. In this work, an eight-channel transmit/receive RF array was built as a multipurpose coil for imaging some of the thus far neglected regions. An extensive coil characterization protocol and first in vivo results of the human wrist, shoulder, elbow, knee, and ankle imaged at 7 T will be presented.

Methods:
Eight surface loop coils with a dimension ofurn:x-wiley:00942405:media:mp7176:mp7176-math-0001 were machined from FR4 circuit board material. To facilitate easy positioning, two coil clusters, each with four loop elements, were combined to one RF transmit/receive array. An overlapped and shifted arrangement of the coil elements was chosen to reduce the mutual inductance between neighboring coils. A phantom made of body-simulating liquid was used for tuning and matching on the bench. Afterward, the S-parameters were verified on a human wrist, elbow, and shoulder. For safety validation, a detailed compliance test was performed including full wave simulations of the RF field distribution and the corresponding specific absorption rate (SAR) for all joints. In vivo images of four volunteers were assessed with gradient echo and spin echo sequences modified to obtain optimal image contrast, full anatomic coverage, and the highest spatial resolution within a reasonable acquisition time. The performance of the RF coil was additionally evaluated by in vivo B1 mapping.

Results:
A comparison of B1 per unit power, flip angle distribution, and anatomic images showed a fairly homogeneous excitation for the smaller joints (elbow, wrist, and ankle), while for the larger joints, the shoulder and especially the knee, B1 inhomogeneities and limited penetration depth were more pronounced. However, the greater part of the shoulder joint could be imaged.In vivo images rendered very fine anatomic details such as fascicles of the median nerve and the branching of the nerve bundles. High-resolution images of cartilage, labrum, and tendons could be acquired. Additionally, turbo spin echo (TSE) and inversion recovery sequences performed very well.

Conclusions:
This study demonstrates that the concept of two four-channel transmit/receive RF arrays can be used as a multipurpose coil for high-resolutionin vivo MR imaging of the musculoskeletal system at 7 T. Not only gradient echo but also typical clinical and SAR-intensive sequences such as STIR and TSE performed well. Imaging of small structures and peripheral nerves could in particular benefit from this technique.
Y1  - 2010
U6  - https://doi.org/10.1118/1.3517176
SN  - 2473-4209
VL  - 37
IS  - 12
SP  - 6368
EP  - 6376
PB  - Wiley
CY  - Hoboken, NJ
ER  - 
TY  - JOUR
A1  - Kraff, Oliver
A1  - Bitz, Andreas
A1  - Breyer, Tobias
A1  - Kruszona, Stefan
A1  - Maderwald, Stefan
A1  - Brote, Irina
A1  - Gizewski, Elke R.
A1  - Ladd, Mark E.
A1  - Quick, Harald H.
T1  - A transmit/receive radiofrequency array for imaging the carotid arteries at 7 Tesla: coil design and first in vivo results
JF  - Investigative Radiology
N2  - Objective: 
To develop a transmit/receive radiofrequency (RF) array for magnetic resonance imaging (MRI) of the carotid arteries at 7 T. The prototype is characterized in numerical simulations and bench measurements, and the feasibility of plaque imaging at 7 T is demonstrated in first in vivo images.

Materials and Methods: 
The RF phased array coil consists of 8 surface loop coils. To allow imaging of both sides of the neck, the RF array is divided into 2 coil clusters, each with 4 overlapping loop elements. For safety validation, numerical computations of the RF field distribution and the corresponding specific absorption rate were performed on the basis of a heterogeneous human body model. To validate the coil model, maps of the transmit B1+ field were compared between simulation and measurement. In vivo images of a healthy volunteer and a patient (ulcerating plaque and a 50% stenosis of the right internal carotid artery) were acquired using a 3-dimensional FLASH sequence with a high isotropic spatial resolution of 0.54 mm as well as using pulse-triggered proton density (PD)/T2-weighted turbo spin echo sequences.

Results: 
Measurements of the S-parameters yielded a reflection and isolation of the coil elements of better than −18 and −13 dB, respectively. Measurements of the g-factor indicated good image quality for parallel imaging acceleration factors up to 2.4. A similar distribution and a very good match of the absolute values were found between the measured and simulated B1+ transmit RF field for the validation of the coil model. In vivo images revealed good signal excitation of both sides of the neck and a high vessel-to-background image contrast for the noncontrast-enhanced 3-dimensional FLASH sequence. Imaging at 7 T could depict the extent of stenosis, and revealed the disruption and ulcer of the plaque.

Conclusions: 
This study demonstrates that 2 four-channel transmit/receive RF arrays for each side of the neck is a suitable concept for in vivo MRI of the carotid arteries at 7 Tesla. Further studies are needed to explore and exploit the full potential of 7 T high-field MRI for carotid atherosclerotic plaque imaging.
Y1  - 2011
U6  - https://doi.org/10.1097/RLI.0b013e318206cee4
SN  - 1536-0210
VL  - 46
IS  - 4
SP  - 246
EP  - 254
PB  - Wolters Kluwer
CY  - Köln
ER  - 
TY  - JOUR
A1  - Kozhalakova, A. A.
A1  - Zhubanova, Azhar A.
A1  - Mansurov, Z. A.
A1  - Digel, Ilya
A1  - Tazhibayeva, S. M.
A1  - Artmann, Gerhard
A1  - Temiz Artmann, Aysegül
T1  - Adsorption of bacterial lipopolysaccharides on carbonized rice shell
JF  - Science of Central Asia (2010)
Y1  - 2010
SP  - 50
EP  - 54
ER  - 
TY  - JOUR
A1  - Kowalski, Julia
A1  - McElwaine, Jim N.
T1  - Shallow two-component gravity-driven flows with vertical variation
JF  - Journal of Fluid Mechanics
Y1  - 2013
SN  - 0022-1120
VL  - 714
SP  - 434
EP  - 462
PB  - Cambridge Univ. Press
CY  - Cambridge
ER  - 
TY  - CHAP
A1  - Kowalski, Julia
A1  - McElwaine, J.
T1  - Two-phase debris flow modeling
T2  - Geophysical Research Abstracts
Y1  - 2008
N1  - A-01048
ER  - 
TY  - CHAP
A1  - Kowalski, Julia
A1  - McArdell, B. W.
A1  - Bartelt, Perry
T1  - A comparison of two approaches to modeling multiphase gravity currents
T2  - Geophysical Research Abstracts
Y1  - 2006
N1  - A-08738
VL  - 8
ER  - 
TY  - JOUR
A1  - Kowalski, Julia
A1  - Linder, Peter
A1  - Zierke, S.
A1  - Wulfen, B. van
A1  - Clemens, J.
A1  - Konstantinidis, K.
A1  - Ameres, G.
A1  - Hoffmann, R.
A1  - Mikucki, J.
A1  - Tulaczyk, S.
A1  - Funke, O.
A1  - Blandfort, D.
A1  - Espe, Clemens
A1  - Feldmann, Marco
A1  - Francke, Gero
A1  - Hiecker, S.
A1  - Plescher, Engelbert
A1  - Schöngarth, Sarah
A1  - Dachwald, Bernd
A1  - Digel, Ilya
A1  - Artmann, Gerhard
A1  - Eliseev, D.
A1  - Heinen, D.
A1  - Scholz, F.
A1  - Wiebusch, C.
A1  - Macht, S.
A1  - Bestmann, U.
A1  - Reineking, T.
A1  - Zetzsche, C.
A1  - Schill, K.
A1  - Förstner, R.
A1  - Niedermeier, H.
A1  - Szumski, A.
A1  - Eissfeller, B.
A1  - Naumann, U.
A1  - Helbing, K.
T1  - Navigation technology for exploration of glacier ice with maneuverable melting probes
JF  - Cold Regions Science and Technology
N2  - The Saturnian moon Enceladus with its extensive water bodies underneath a thick ice sheet cover is a potential candidate for extraterrestrial life. Direct exploration of such extraterrestrial aquatic ecosystems requires advanced access and sampling technologies with a high level of autonomy. A new technological approach has been developed as part of the collaborative research project Enceladus Explorer (EnEx). The concept is based upon a minimally invasive melting probe called the IceMole. The force-regulated, heater-controlled IceMole is able to travel along a curved trajectory as well as upwards. Hence, it allows maneuvers which may be necessary for obstacle avoidance or target selection. Maneuverability, however, necessitates a sophisticated on-board navigation system capable of autonomous operations. The development of such a navigational system has been the focal part of the EnEx project. The original IceMole has been further developed to include relative positioning based on in-ice attitude determination, acoustic positioning, ultrasonic obstacle and target detection integrated through a high-level sensor fusion. This paper describes the EnEx technology and discusses implications for an actual extraterrestrial mission concept.
Y1  - 2016
U6  - https://doi.org/10.1016/j.coldregions.2015.11.006
SN  - 0165-232X
IS  - 123
SP  - 53
EP  - 70
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - CHAP
A1  - Kowalski, Julia
A1  - Bartelt, Perry
A1  - McElwaine, J.
T1  - Two-phase debris flow modeling
T2  - Geophysical Research Abstracts
Y1  - 2007
N1  - A-08119
ER  - 
TY  - THES
A1  - Kowalski, Julia
T1  - Two-phase Modeling of Debris Flows
Y1  - 2008
SN  - 978-3-86664-524-0
N1  - Diss., Eidgenössische Technische Hochschule ETH Zürich, Nr. 17827, 2008
PB  - Mensch und Buch
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Kowalski, Julia
T1  - Numerical Debris Flow Simulation
T2  - Schweizer Numerik Kolloquium : Book of Abstracts 12. April 2006
Y1  - 2006
ER  - 
TY  - JOUR
A1  - Kowalewski, Paul
A1  - Bragard, Michael
A1  - Hüning, Felix
A1  - De Doncker, Rik W.
T1  - An inexpensive Wiegand-sensor-based rotary encoder without rotating magnets for use in electrical drives
JF  - IEEE Transactions on Instrumentation and Measurement
N2  - This paper introduces an inexpensive Wiegand-sensor-based rotary encoder that avoids rotating magnets and is suitable for electrical-drive applications. So far, Wiegand-sensor-based encoders usually include a magnetic pole wheel with rotating permanent magnets. These encoders combine the disadvantages of an increased magnet demand and a limited maximal speed due to the centripetal force acting on the rotating magnets. The proposed approach reduces the total demand of permanent magnets drastically. Moreover, the rotating part is manufacturable from a single piece of steel, which makes it very robust and cheap. This work presents the theoretical operating principle of the proposed approach and validates its benefits on a hardware prototype. The presented proof-of-concept prototype achieves a mechanical resolution of 4.5 ° by using only 4 permanent magnets, 2Wiegand sensors and a rotating steel gear wheel with 20 teeth.
KW  - Rotary encoder
KW  - Wiegand sensor
Y1  - 2023
U6  - https://doi.org/10.1109/TIM.2023.3326166
SN  - 0018-9456 (Print)
SN  - 1557-9662 (Online)
VL  - 72
SP  - 10 Seiten
PB  - IEEE
CY  - New York
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Riekert, Lothar
A1  - Weyland, Friedrich
T1  - The performance of base metal oxides on ceramic carriers as catalysts for air pollution control
JF  - International chemical engineering. 25 (1985), H. 3
Y1  - 1985
SN  - 0020-6318
SP  - 418
EP  - 427
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Riekert, L.
A1  - Weyland, F.
T1  - Deposition of ternary oxides as active components by impregnation of porous carriers
JF  - Preparation of Catalysts III : scientific bases for the preparation of heterogeneous catalysts ; proceedings of the Third International Symposium, Louvain-la-Neuve, September 6-9, 1982 / ed.: G. Poncelet ... - (Studies in surface science and catalysis ; 16)
Y1  - 1983
SN  - 0-444-42184-X
N1  - International Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts <3, 1982, Louvain-la-Neuve>
SP  - 521
EP  - 530
PB  - Elsevier
CY  - Amsterdam [u.a.]
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Riekert, L.
T1  - Impregnation-type catalysts with nonuniform distribution of the active component
JF  - Chemical engineering fundamentals. 2 (1983)
Y1  - 1983
SN  - 0723-0966
SP  - 19
EP  - 38
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Riekert, L.
T1  - The influence of impregnation, drying and activation on the activity and distribution of CuO on &#945;-Alumina
JF  - Preparation of Catalysts II : scientific bases for the preparation of heterogeneous catalysts ; Proceedings of the Second International Symposium, Louvain-la-Neuve, September 4-7, 1978 / Eds.: B. Delmon ... - (Studies in surface science and catalysis ; 3)
Y1  - 1979
SN  - 0-444-41733-8
N1  - International Symposium on the Scientific Bases for the Preparation of Heterogeneous Catalysts <2, 1978, Louvain-la-Neuve>
SP  - 51
EP  - 63
PB  - Elsevier
CY  - Amsterdam [u.a.]
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Lintz, Hans-Günther
A1  - Turek, Thomas
T1  - Selective catalytic reduction of nitrogen oxide by use of the Ljungstroem air heater as reactor : a case study
JF  - Chemical engineering science  . 47 (1992), H. 9-11
Y1  - 1992
SN  - 0009-2509
SP  - 2763
EP  - 2768
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Lintz, Hans-Günther
A1  - Riekert, Lothar
A1  - Trimm, D. L.
T1  - Structure and selectivity changes in vanadia-titania catalysts used to promote the reduction of nitric oxide with ammonia
JF  - Applied catalysis. 52 (1989), H. 1
Y1  - 1989
SN  - 0166-9834
N1  - ISSN der E-Ausg.: 0166-9834
SP  - 225
EP  - 235
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Li, D. X.
A1  - Riekert, Lothar
T1  - Partial oxidation of o-xylene to phthalic anhydride in a structured fixed bed containing a sequence of catalysts
JF  - New developments in selective oxidation : proceedings of an international symposium ; Rimini, Italy, Sept. 18 - 22, 1989 / eds.: G. Centi ... - (Studies in surface science and catalysis ; 55)
Y1  - 1990
SN  - 0-444-88694-X
SP  - 267
EP  - 274
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Heering, J.
A1  - Riekert, L.
T1  - Diffusion and catalytic reaction in zeolite ZSM-5 / J. Heering ;  M. Kotter ; L. Riekert
JF  - Chemical engineering science  . 37 (1982), H. 4
Y1  - 1982
SN  - 0009-2509
SP  - 581
EP  - 584
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Hammon, Ulrich
A1  - Riekert, Lothar
T1  - Formation of ethene and propene from methanol on zeolite ZSM-5 II. Preparation of finished catalysts and operation of a fixed-bed pilot plant / U. Hammon ; M. Kotter ; L. Riekert
JF  - Applied catalysis. 37 (1988)
Y1  - 1988
SN  - 0166-9834
N1  - ISSN der E-Ausg.: 0166-9834
SP  - 155
EP  - 174
ER  - 
TY  - JOUR
A1  - Kotter, Michael
A1  - Hammon, U.
T1  - Preparation of pellets with well-defined pore structure / U. Hammon ; A. Kotter
JF  - International chemical engineering. 26 (1986), H. 4
Y1  - 1986
SN  - 0020-6318
SP  - 563
EP  - 573
ER  -