TY - JOUR
A1 - Pietsch, Wolfram
A1 - Taudes, A.
T1 - Groupware Support for Interorganizational Courseware-Development. A Case Study / Pietsch, W. , Taudes, A.
JF - IM : die Fachzeitschrift für Information Management & Consulting (1994)
Y1 - 1994
SN - 0930-5181, 1616-1017
SP - 12
EP - 18
ER -
TY - JOUR
A1 - Pietsch, Wolfram
A1 - Steinbauer, Dieter
T1 - Business Process Reengineering
JF - Wirtschaftsinformatik. 36 (1994), H. 5
Y1 - 1994
SN - 0937-6429
SP - 502
EP - 505
ER -
TY - JOUR
A1 - Pietsch, Wolfram
A1 - Kurbel, Karl
A1 - Jung, R.
T1 - Modeling Knowledge about Long-term IS-Integration and Integration-oriented Reengineering with KADS / Kurbel, K., Jung, R., Pietsch, W.
JF - Distributed information systems in business / W. König ... (eds.)
Y1 - 1996
SN - 3-540-61094-4
PB - Springer
CY - Berlin [u.a.]
ER -
TY - JOUR
A1 - Pietsch, Wolfram
A1 - Kurbel, Karl
T1 - A Cooperative Work Environment for Evolutionary Software Development / Kurbel, K., Pietsch, W.
JF - Multi-user interfaces and applications : proceedings of the IFIP WG 8.4 Conference on Multi-User Interfaces and Applications, Heraklion, Crete, Greece, 24 - 26 September, 1990 / ed. by Simon Gibbs ...
Y1 - 1990
SN - 0-444-88760-1
N1 - Conference on Multi-User Interfaces and Applications <1990, Hērakleion>
SP - 115
EP - 127
PB - North-Holland Publ.
CY - Amsterdam [u.a.]
ER -
TY - JOUR
A1 - Pietsch, Wolfram
A1 - Kurbel, Karl
T1 - A Portable Implementation of Index Sequential Input-Output [Part 1] / Kurbel, Karl; Pietsch, W.
JF - Ada letters. 6 (1986), H. 2
Y1 - 1986
SN - 0736-721X
SP - 29
EP - 40
ER -
TY - JOUR
A1 - Pietsch, Wolfram
A1 - Kurbel, Karl
T1 - A Portable Implementation of Index Sequential Input-Output [Part 2] / Kurbel, Karl; Pietsch, W.
JF - Ada letters. 6 (1986), H. 3
Y1 - 1986
SN - 0736-721X
SP - 6
EP - 13
ER -
TY - JOUR
A1 - Pietsch, Wolfram
A1 - Kurbel, K.
A1 - Labentz, M.
T1 - Prototyping und Projektmanagement bei großen Entwicklungsteams / Kurbel, K., Labentz, M., Pietsch, W.
JF - Information management : IM ; Praxis, Ausbildung u. Forschung d. Wirtschaftsinformatik. 2 (1987), H. 1
Y1 - 1987
SN - 0930-5181
SP - 6
EP - 15
ER -
TY - CHAP
A1 - Pietsch, Wolfram
A1 - Herzwurm, Georg
A1 - Zander, Dietmar
T1 - Assuring quality of QFD-education in Germany
T2 - ISQFD'06: 12th International Symposium on QFD : Tokyo, 07.-09.2006
Y1 - 2006
SP - 1
EP - 6
ER -
TY - JOUR
A1 - Pietsch, Wolfram
A1 - Herzwurm, G.
T1 - QFD for Customer-Focused Requirements Engineering / Herzwurm, G., Pietsch, W.
JF - Proceedings : 8 - 12 September 2003, Monterey Bay, California, USA / sponsored by IEEE Computer Society Technical Council on Software Engineering (TCSE) ... In cooperation with ACM SigSOFT
Y1 - 2003
SN - 0769519806
N1 - International Requirements Engineering Conference ; (11, 2003, Monterey, Calif.)
SP - 330
EP - 338
PB - IEEE Computer Society
CY - Los Alamitos, Calif. [u.a.]
ER -
TY - JOUR
A1 - Pietsch, Wolfram
T1 - Risk-based Deployment of Standard Software Rollout Processes - a pragmatic approach
JF - QFD : transactions from the Eleventh Symposium on Quality Function Deployment, [June 12 - 18, 1999, Novi, Michigan] / QFD Institute
Y1 - 1999
SN - 1889477117
N1 - Symposium on Quality Function Deployment ; (11, 1999, Novi, Mich.) Online unter: http://www.herzwurm.de/Publikationen/daten/lit/deployment.pdf
SP - 349
EP - 359
PB - QFD Institute
CY - Ann Arbor, Mich.
ER -
TY - BOOK
A1 - Pietsch, Wolfram
T1 - Software quality management III : [... held in Seville in April 1995] / [Third International Conference on Software Quality Management]. Ed.: M. Ross
Y1 - 1995
SN - 1853123099
N1 - International Conference on Software Quality Management ; (3, 1995, Sevilla)
PB - Computational Mechanics Publ.
CY - Southampton [u.a.]
ER -
TY - JOUR
A1 - Pietsch, Wolfram
T1 - Customer-Oriented Specification and Evaluation of IT Service Level Agreements
JF - Software process improvement : Elektronische Ressource : 12th European conference ; proceedings / EuroSPI 2005, Budapest, Hungary, November 9 - 11, 2005. Ita Richardson ... (ed.)
Y1 - 2005
SN - 3-540-30286-7
N1 - Lecture notes in computer science ; 3792 ; EuroSPI <12, 2005, Budapest>
SP - 83
EP - 94
PB - Springer
CY - Berlin [u.a.]
ER -
TY - JOUR
A1 - Pietsch, Wolfram
T1 - IT Service Deployment
JF - QFD : transactions from International Symposium on QFD 2007 - Williamsburg, the Nineteenth Symposium on Quality Function Deployment ; September 7 - 8, 2007, Williamsburg, VA ; [companion document to the Thirteenth International and Nineteenth North American Symposium on Quality Function Deployment (ISQFD'07)] / [organized and hosted by the QFD Institute]
Y1 - 2007
SN - 1-889477-19-2
N1 - QFD 2007, 19th Symposium on Quality Function Deployment, Williamsburg, VA, US, Sep 7-8, 2007
SP - 203
EP - 212
PB - QFD Inst.
CY - Ann Arbor, Mich.
ER -
TY - CHAP
A1 - Pietsch, Wolfram
T1 - A framework for strategic positioning of IT-products
T2 - Software business : from physical products to software services and solutions : 4th International Conference on Software Business, ICSOB 2013; Potsdam; Germany; 11 June 2013 through 14 June 2013. (Lecture notes in business information processing ; 150)
N2 - IT Products are viewed and managed differently depending on the perspectives and the stage within the life cycle. A model is presented that integrates different perspectives and stages serving as an aid for the analysis of business models and focused positioning of IT-products. Four generic business models are analysed with regard to the product management function in general and the positioning field for IT-products specifically: off-the-shelf (license), license plus service, project, and system service (incl. cloud computing).
KW - Strategic Business Planning
KW - IT Products
KW - Business Models
KW - Product Management
Y1 - 2013
U6 - https://doi.org/10.1007/978-3-642-39336-5_11
SP - 102
EP - 116
PB - Springer
CY - Berlin
ER -
TY - CHAP
A1 - Pietsch, Wolfram
T1 - A framework of quality function deployment
T2 - Quality management / eds.: M. Ross ... (Software quality management ; 3,1)
Y1 - 1995
SN - 1-85312-309-9
SP - 419
EP - 428
PB - Computational Mechanics Publ.
CY - Southhampton
ER -
TY - JOUR
A1 - Pietsch, Wolfram
T1 - Augmenting voice of the customer analysis by analysis of belief
JF - QFD-Forum
Y1 - 2015
SN - 1431-6951
IS - 30
SP - 1
EP - 5
ER -
TY - CHAP
A1 - Pieronek, Lukas
A1 - Kleefeld, Andreas
ED - Constanda, Christian
ED - Harris, Paul
T1 - The Method of Fundamental Solutions for Computing Interior Transmission Eigenvalues of Inhomogeneous Media
T2 - Integral Methods in Science and Engineering: Analytic Treatment and Numerical Approximations
N2 - The method of fundamental solutions is applied to the approximate computation of interior transmission eigenvalues for a special class of inhomogeneous media in two dimensions. We give a short approximation analysis accompanied with numerical results that clearly prove practical convenience of our alternative approach.
Y1 - 2019
SN - 978-3-030-16077-7
U6 - https://doi.org/10.1007/978-3-030-16077-7_28
SP - 353
EP - 365
PB - Birkhäuser
CY - Cham
ER -
TY - JOUR
A1 - Pieronek, Lukas
A1 - Kleefeld, Andreas
T1 - On trajectories of complex-valued interior transmission eigenvalues
JF - Inverse problems and imaging : IPI
N2 - This paper investigates the interior transmission problem for homogeneous media via eigenvalue trajectories parameterized by the magnitude of the refractive index. In the case that the scatterer is the unit disk, we prove that there is a one-to-one correspondence between complex-valued interior transmission eigenvalue trajectories and Dirichlet eigenvalues of the Laplacian which turn out to be exactly the trajectorial limit points as the refractive index tends to infinity. For general simply-connected scatterers in two or three dimensions, a corresponding relation is still open, but further theoretical results and numerical studies indicate a similar connection.
KW - Interior transmission problem
KW - Eigenvalue trajectories
KW - Complex-valued eigenvalues
Y1 - 2024
U6 - https://doi.org/10.3934/ipi.2023041
SN - 1930-8337 (Print)
SN - 1930-8345 (Online)
VL - 18
IS - 2
SP - 480
EP - 516
PB - AIMS
CY - Springfield, Mo
ER -
TY - GEN
A1 - Pier, Arnold
A1 - Hummen, Jörg
A1 - Stellberg, Michael
T1 - Surgical clip applicator
Y1 - 1996
ER -
TY - CHAP
A1 - Pieper, Martin
A1 - Schulz, Silvia
T1 - Teaching Simulation Methods with COMSOL Multiphysics
N2 - This paper describes two courses on
simulation methods for graduate students:
“Simulation Methods” and “Simulation and
Optimization in Virtual Engineering” The
courses were planned to teach young engineers
how to work with simulation software as well as
to understand the necessary mathematical background.
As simulation software COMSOL is
used. The main philosophy was to combine
theory and praxis in a way that motivates the
students. In addition “soft skills” should be
improved. This was achieved by project work as
final examination. As underlying didactical principle
the ideas of Bloom’s revised taxonomy
were followed. The paper basically focusses on
educational aspects, e.g. how to structure the
course, plan the exercises, organize the project
work and include practical COMSOL examples.
KW - COMSOL Multiphysics
KW - Optimization module
KW - LiveLink for MATLAB
KW - Bloom Taxonomy
KW - education
Y1 - 2014
ER -
TY - JOUR
A1 - Pieper, Martin
A1 - Klein, Peter
T1 - A simple and accurate numerical network flow model for bionic micro heat exchangers
JF - Heat mass transfer
Y1 - 2011
SN - 0947-7411
VL - 47
IS - 5
SP - 491
EP - 503
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Pieper, Martin
A1 - Klein, Peter
T1 - Application of simple, periodic homogenization techniques to non-linear heat conduction problems in non-periodic, porous media
JF - Heat mass transfer
N2 - Often, detailed simulations of heat conduction in complicated, porous media have large runtimes. Then homogenization is a powerful tool to speed up the calculations by preserving accurate solutions at the same time. Unfortunately real structures are generally non-periodic, which requires unpractical, complicated homogenization techniques. We demonstrate in this paper, that the application of simple, periodic techniques to realistic media, that are just close to periodic, gives accurate, approximative solutions. In order to obtain effective parameters for the homogenized heat equation, we have to solve a so called “cell problem”. In contrast to periodic structures it is not trivial to determine a suitable unit cell, which represents a non-periodic media. To overcome this problem, we give a rule of thumb on how to choose a good cell. Finally we demonstrate the efficiency of our method for virtually generated foams as well as real foams and compare these results to periodic structures.
Y1 - 2012
U6 - https://doi.org/10.1007/s00231-011-0879-4
SN - 0947-7411
VL - 48
IS - 2
SP - 291
EP - 300
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Pieper, Martin
A1 - Klein, Peter
T1 - Numerical solution of the heat equation with non-linear, time derivative-dependent source term
JF - International Journal for Numerical Methods in Engineering
N2 - The mathematical modeling of heat conduction with adsorption effects in coated metal structures yields the heat equation with piecewise smooth coefficients and a new kind of source term. This term is special, because it is non-linear and furthermore depends on a time derivative. In our approach we reformulated this as a new problem for the usual heat equation, without source term but with a new non-linear coefficient. We gave an existence and uniqueness proof for the weak solution of the reformulated problem. To obtain a numerical solution, we developed a semi-implicit and a fully implicit finite volume method. We compared these two methods theoretically as well as numerically. Finally, as practical application, we simulated the heat conduction in coated aluminum fibers with adsorption in the zeolite coating. Copyright © 2010 John Wiley & Sons, Ltd.
Y1 - 2010
U6 - https://doi.org/10.1002/nme.2937
SN - 0029-5981
VL - 84
IS - 10
SP - 1205
EP - 1221
PB - Wiley
CY - Chichester
ER -
TY - JOUR
A1 - Pieper, Martin
A1 - Ivanyshyn, Olha
T1 - Nonlinear integral equations for a 3D inverse acoustic scattering problem : abstract / O. Ivanyshyn and M. Pieper
Y1 - 2008
N1 - World Congress on Computational Mechanics <8, 2008, Venedig> ; European Congress on Computational Methods in Applied Sciences and Engineering <5, 2008, Venedig>
ER -
TY - JOUR
A1 - Pieper, Martin
T1 - Vector hyperinterpolation on the sphere
JF - Journal of approximation theory. 156 (2009), H. 2
Y1 - 2009
SN - 0021-9045
SP - 173
EP - 186
ER -
TY - JOUR
A1 - Pieper, Martin
T1 - Nonlinear integral equations for an inverse electromagnetic scattering problem
JF - Journal of Physics Conference Series. 124 (2008)
Y1 - 2008
SN - 1742-6596
ER -
TY - JOUR
A1 - Pieper, Martin
T1 - Multiobjective optimization with expensive objectives applied to a thermodynamic material design problem
JF - Proceedings in applied mathematics and mechanics : PAMM. 11 (2011), H. 1
Y1 - 2011
SN - 1617-7061
SP - 733
EP - 734
PB - Wiley
CY - Weinheim
ER -
TY - BOOK
A1 - Pieper, Martin
T1 - Quantum mechanics: Introduction to mathematical formulation
N2 - Anyone who has always wanted to understand the hieroglyphs on Sheldon's blackboard in the TV series The Big Bang Theory or who wanted to know exactly what the fate of Schrödinger's cat is all about will find a short, descriptive introduction to the world of quantum mechanics in this essential. The text particularly focuses on the mathematical description in the Hilbert space. The content goes beyond popular scientific presentations, but is nevertheless suitable for readers without special prior knowledge thanks to the clear examples.
KW - Quantenmechanik
KW - Hilbert Room
KW - Postulates
KW - Schrödingers cat
KW - Operators
Y1 - 2021
SN - 978-3-658-32644-9
SN - 978-3-658-32645-6
U6 - https://doi.org/10.1007/978-3-658-32645-6
PB - Springer
CY - Wiesbaden
ER -
TY - JOUR
A1 - Pichler, A.
A1 - George, A.
A1 - Seiler, F.
A1 - Srulijes, J.
A1 - Havermann, Marc
T1 - Doppler Picture Velocimetry (DPV) applied to hypersonics
JF - Shock Waves [Elektronische Ressource] : 26th International Symposium on Shock Waves, Volume 1 / edited by Klaus Hannemann, Friedrich Seiler
Y1 - 2009
SN - 978-3-540-85168-4
N1 - International Symposium on Shock Waves ; (26 ; 2007.07.15-20 ; Göttingen) ; ISSW ; (26 ; 2007.07.15-20 ; Göttingen)
SP - 503
EP - 508
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Philipp, Mohr
A1 - Efthimiou, Nikos
A1 - Pagano, Fiammetta
A1 - Kratochwil, Nicolaus
A1 - Pizzichemi, Marco
A1 - Tsoumpas, Charalampos
A1 - Auffray, Etiennette
A1 - Ziemons, Karl
T1 - Image reconstruction analysis for positron emission tomography with heterostructured scintillators
JF - IEEE Transactions on Radiation and Plasma Medical Sciences
N2 - The concept of structure engineering has been proposed for exploring the next generation of radiation detectors with improved performance. A TOF-PET geometry with heterostructured scintillators with a pixel size of 3.0×3.1×15 mm3 was simulated using Monte Carlo. The heterostructures consisted of alternating layers of BGO as a dense material with high stopping power and plastic (EJ232) as a fast light emitter. The detector time resolution was calculated as a function of the deposited and shared energy in both materials on an event-by-event basis. While sensitivity was reduced to 32% for 100 μm thick plastic layers and 52% for 50 μm, the CTR distribution improved to 204±49 ps and 220±41 ps respectively, compared to 276 ps that we considered for bulk BGO. The complex distribution of timing resolutions was accounted for in the reconstruction. We divided the events into three groups based on their CTR and modeled them with different Gaussian TOF kernels. On a NEMA IQ phantom, the heterostructures had better contrast recovery in early iterations. On the other hand, BGO achieved a better contrast to noise ratio (CNR) after the 15th iteration due to the higher sensitivity. The developed simulation and reconstruction methods constitute new tools for evaluating different detector designs with complex time responses.
KW - TOF PET
KW - Heterostructure
KW - Metascintillator
KW - Multiple TOF kernels
KW - Image Reconstruction
Y1 - 2022
U6 - https://doi.org/10.1109/TRPMS.2022.3208615
SN - 2469-7311
SN - 2469-7303
VL - 7
IS - 1
SP - 41
EP - 51
PB - IEEE
CY - New York, NY
ER -
TY - CHAP
A1 - Philipp, Brauner
A1 - Brillowski, Florian Sascha
A1 - Dammers, Hannah
A1 - Königs, Peter
A1 - Kordtomeikel, Frauke Carole
A1 - Petruck, Henning
A1 - Schaar, Anne Kathrin
A1 - Schmitz, Seth
A1 - Steuer-Dankert, Linda
A1 - Mertens, Alexander
A1 - Gries, Thomas
A1 - Leicht-Scholten, Carmen
A1 - Nagel, Saskia K.
A1 - Nitsch, Verena
A1 - Schuh, Günther
A1 - Ziefle, Martina
ED - Mrugalska, Beata
ED - Trzcielinski, Stefan
ED - Karwowski, Waldemar
ED - Nicolantonio, Massimo Di
ED - Roossi, Emilio
T1 - A research framework for human aspects in the internet of production: an intra-company perspective
T2 - Proceedings of the AHFE 2020
N2 - Digitalization in the production sector aims at transferring concepts and methods from the Internet of Things (IoT) to the industry and is, as a result, currently reshaping the production area. Besides technological progress, changes in work processes and organization are relevant for a successful implementation of the “Internet of Production” (IoP). Focusing on the labor organization and organizational procedures emphasizes to consider intra-company factors such as (user) acceptance, ethical issues, and ergonomics in the context of IoP approaches. In the scope of this paper, a research approach is presented that considers these aspects from an intra-company perspective by conducting studies on the shop floor, control level and management level of companies in the production area. Focused on four central dimensions—governance, organization, capabilities, and interfaces—this contribution presents a research framework that is focused on a systematic integration and consideration of human aspects in the realization of the IoP.
KW - Human factors
KW - Digitalization
KW - Acceptance
KW - Ethics
KW - Human-robot collaboration
Y1 - 2020
SN - 978-3-030-51980-3
U6 - https://doi.org/10.1007/978-3-030-51981-0_1
N1 - AHFE 2020 Virtual Conferences on Human Aspects of Advanced Manufacturing, Advanced Production Management and Process Control, and Additive Manufacturing, Modeling Systems and 3D Prototyping, July 16–20, 2020, USA
SP - 3
EP - 17
PB - Springer
CY - Cham
ER -
TY - JOUR
A1 - Pham, Phu Tinh
A1 - Vu, Khoi Duc
A1 - Tran, Thanh Ngoc
A1 - Staat, Manfred
T1 - A primal-dual algorithm for shakedown analysis of elastic-plastic bounded linearly kinematic hardening bodies
Y1 - 2010
N1 - 4th European Conference on Computational Mechanics (Solids, Structures and Coupled Problems in Engineering), ECCOMAS ECCM 2010, Paris, France, May 17 – 21, 2010
ER -
TY - JOUR
A1 - Pham, Phu Tinh
A1 - Staat, Manfred
T1 - FEM-based shakedown analysis of hardening structures
JF - Asia Pacific journal on computational engineering
N2 - This paper develops a new finite element method (FEM)-based upper bound algorithm for limit and shakedown analysis of hardening structures by a direct plasticity method. The hardening model is a simple two-surface model of plasticity with a fixed bounding surface. The initial yield surface can translate inside the bounding surface, and it is bounded by one of the two equivalent conditions: (1) it always stays inside the bounding surface or (2) its centre cannot move outside the back-stress surface. The algorithm gives an effective tool to analyze the problems with a very high number of degree of freedom. Our numerical results are very close to the analytical solutions and numerical solutions in literature.
Y1 - 2014
U6 - https://doi.org/10.1186/2196-1166-1-4
SN - 2196-1166 (E-Journal)
IS - 1
SP - Article No. 4
PB - SpringerOpen
CY - Berlin
ER -
TY - CHAP
A1 - Pham, Phu Tinh
A1 - Staat, Manfred
T1 - A simplification for shakedown analysis of hardening structures
T2 - Conference proceedings of the YIC GACM 2015 : 3rd ECCOMAS Young Investigators Conference and 6th GACM Colloquium on Computational Mechanics , Aachen , Germany, 20.07.2015 - 23.07.2015 / ed.: Stefanie Elgeti ; Jaan-Willem Simon
Y1 - 2015
SP - 1
EP - 4
PB - RWTH Aachen University
CY - Aachen
ER -
TY - JOUR
A1 - Pham, Phu Tinh
A1 - Staat, Manfred
T1 - An Upper Bound Algorithm for Limit and Shakedown Analysis of Bounded Linearly Kinematic Hardening Structures
JF - Limit State of Materials and Structures : Direct Methods 2. Saxcé, Géry de (Hrsg.)
Y1 - 2013
SN - 978-94-007-5424-9
SP - 71
EP - 87
PB - Springer
CY - Dordrecht
ER -
TY - CHAP
A1 - Pham, Phu Tinh
A1 - Nguyen, Thanh Ngoc
A1 - Staat, Manfred
T1 - FEM based shakedown analysis of hardening structures
T2 - Proceedings International Conference on Advances in Computational Mechanics (ACOME)
Y1 - 2012
N1 - International Conference on Advances in Computational Mechanics (ACOME), August 14-16, 2012, Ho Chi Minh City, Vietnam
SP - 870
EP - 882
ER -
TY - THES
A1 - Pham, Phu Tinh
T1 - Upper bound limit and shakedown analysis of elastic-plastic bounded linearly kinematic hardening structures
Y1 - 2011
N1 - Aachen, Techn. Hochsch., Diss., 2011
PB - RWTH Aachen University
CY - Aachen
ER -
TY - CHAP
A1 - Pfundt, H.
A1 - Vogelsang, D.
A1 - Gerling, Ulrich
T1 - Calculation of the crust profile in aluminium reduction cells by thermal computer modelling
T2 - Light metals 1989 : 118th annual meeting of the Minerals, Metals and Materials Society, Las Vegas, NV, Feb. 27 - Mar. 03. 1989
Y1 - 1988
SP - 371
EP - 377
PB - Minerals, Metals and Materials Soc.
CY - Warrendale, Pa.
ER -
TY - CHAP
A1 - Pfetsch, Marc E.
A1 - Abele, Eberhard
A1 - Altherr, Lena
A1 - Bölling, Christian
A1 - Brötz, Nicolas
A1 - Dietrich, Ingo
A1 - Gally, Tristan
A1 - Geßner, Felix
A1 - Groche, Peter
A1 - Hoppe, Florian
A1 - Kirchner, Eckhard
A1 - Kloberdanz, Hermann
A1 - Knoll, Maximilian
A1 - Kolvenbach, Philip
A1 - Kuttich-Meinlschmidt, Anja
A1 - Leise, Philipp
A1 - Lorenz, Ulf
A1 - Matei, Alexander
A1 - Molitor, Dirk A.
A1 - Niessen, Pia
A1 - Pelz, Peter F.
A1 - Rexer, Manuel
A1 - Schmitt, Andreas
A1 - Schmitt, Johann M.
A1 - Schulte, Fiona
A1 - Ulbrich, Stefan
A1 - Weigold, Matthias
T1 - Strategies for mastering uncertainty
T2 - Mastering uncertainty in mechanical engineering
N2 - This chapter describes three general strategies to master uncertainty in technical systems: robustness, flexibility and resilience. It builds on the previous chapters about methods to analyse and identify uncertainty and may rely on the availability of technologies for particular systems, such as active components. Robustness aims for the design of technical systems that are insensitive to anticipated uncertainties. Flexibility increases the ability of a system to work under different situations. Resilience extends this characteristic by requiring a given minimal functional performance, even after disturbances or failure of system components, and it may incorporate recovery. The three strategies are described and discussed in turn. Moreover, they are demonstrated on specific technical systems.
Y1 - 2021
SN - 978-3-030-78353-2
U6 - https://doi.org/10.1007/978-3-030-78354-9_6
N1 - Part of the Springer Tracts in Mechanical Engineering book series (STME)
SP - 365
EP - 456
PB - Springer
CY - Cham
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Vinsonneau, B.
A1 - Burnham, K. J.
T1 - Multiple models for nonlinear systems
T2 - Proceedings / Eigteenth International Conference on Systems Engineering : ICSE 2006 : 5 - 7 September 2006 ; [held at Coventry University, UK]
Y1 - 2006
SN - 1-84600-013-0
SP - 347
EP - 352
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Shahidi, Parham
A1 - Enning, Manfred
T1 - Connected freight rail rolling stock: a modular approach integrating sensors, actors and cyber physical systems for operational advantages and condition based maintenance
T2 - Asia-Pacific Conference of the Prognostics and Health Management Society
Y1 - 2017
N1 - Asia-Pacific Conference of the
Prognostics and Health Management Society, Jeju, Korea 2017
SP - 1
EP - 7
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Schmidt, Bernd
A1 - Wilbring, Daniela
A1 - Franzen, Julian
T1 - Wagon4.0 – the smart wagon for improved integration into Industry 4.0 plants
T2 - Proceedings of the International Heavy Haul Association STS Conference 2019
N2 - In many instances, freight vehicles exchange load or information with plants that are or will soon be Industry4.0 plants. The Wagon4.0 concept, as developed in close cooperation with e.g. port or mine operations, offers a maximum in railway operational efficiency while providing strong business cases already in the respective plant interaction. The Wagon4.0 consists of main components, a power supply, data network, sensors, actuators and an operating system, the so called WagonOS. The Wagon OS is implemented in a granular, self-sufficient manner, to allow basic features such as WiFi-Mesh and train christening in remote areas without network connection. Furthermore, the granularity of the operating system allows to extend the familiar app concept to freight rail rolling stock, making it possible to use specialised actuators for certain applications, e.g. an electrical parking brake or an auxiliary drive. In order to facilitate migration to the Wagon4.0 for existing fleets, a migration concept featuring five levels of technical adaptation was developed. The present paper investigates the benefits of Wagon4.0-implementations for the particular challenges of heavy haul operations by focusing on train christening, ep-assisted braking, autonomous last mile and traction boost operation as well as improved maintenance schedules
Y1 - 2019
N1 - International Heavy Haul Association STS Conference, 10th to 14th June 2019, Narvik, Norway
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Schmidt, B. D.
A1 - Enning, Manfred
T1 - Towards inclusion of the freight rail system in the industrial internet of things - Wagon 4.0
T2 - Stephenson Conference, London, March 2017
Y1 - 2017
N1 - IMechE Stephenson Conference <2017, London, United Kingdom>
SP - 1
EP - 10
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Pichler, Alexander
A1 - George, Alfred
A1 - Seiler, Friedrich
T1 - Model based image processing for flow visualisation : 16th International Conference on Systems Science, Wroclaw, Poland, September 04 - 06, 2007
T2 - PU / Institut Franco-Allemand de Recherches de Saint-Louis ; 2007, 620
Y1 - 2007
SP - 1
EP - 10
PB - ISL
CY - Saint Louis, France
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Moshiri, Amir
A1 - Reich, Alexander
A1 - Gäbel, Markus
T1 - Modelling of the effect of sanding on the wheel-rail adhesion area
T2 - First International Conference on Rail Transportation
Y1 - 2017
N1 - 2017 ICRT;
International Conference on Rail Transportation <1, 2017, Chengdu, China>
SP - 1
EP - 7
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Melcher, Karin
A1 - Franzen, Julian
T1 - Rare event simulation to optimise maintenance intervals of safety critical redundant subsystems
T2 - Proceedings of the European Conference of the PHM Society
Y1 - 2018
VL - 4
IS - 1
SP - 1
EP - 6
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Larkowski, Tomasz
A1 - Burnham, Keith J.
T1 - An application of adaptive control in the behavioural framework
T2 - 21st International Conference on Systems Engineering (ICSEng) : 16 - 18 Aug. 2011, Las Vegas, Nevada ; proceedings
Y1 - 2011
SN - 978-1-4577-1078-0 ; 978-0-7695-4495-3
SP - 49
EP - 54
PB - IEEE
CY - Piscataway, NJ
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Larkowski, Tomasz
A1 - Burnham, Keith J.
T1 - An approach to adaptive control in the behavioural framework
T2 - UKACC International Conference on Control 2010 (CONTROL 2010) : Coventry, United Kingdom, 7 - 10 September 2010 ; Vol. 2. (IET seminar digest ; 2010/004)
Y1 - 2010
SN - 978-1-62748-119-9
SP - 833
EP - 838
PB - Curran
CY - Red Hook, NY
ER -
TY - CHAP
A1 - Pfaff, Raphael
A1 - Burnham, Keith J.
T1 - On abstraction and interpretability: a behavioural perspective
T2 - 19th International Conference on Systems Engineering 2008 : ICSENG '08 : 19 - 21 Aug. 2008, University of Nevada, Las Vegas, Nevada
Y1 - 2008
SN - 978-0-7695-3331-5 ; 978-0-7695-2719-2
SP - 89
EP - 94
PB - IEEE
CY - Piscataway, NJ
ER -
TY - JOUR
A1 - Pfaff, Raphael
A1 - Burnham, Keith J.
T1 - On abstraction and interpretability: a behavioural perspective
JF - Systems Science
Y1 - 2009
SN - 0137-1223
VL - Vol. 35
IS - Iss. 2
SP - 19
EP - 26
ER -
TY - THES
A1 - Pfaff, Raphael
T1 - Evaluation and extension of the potential for application of the behavioural framework to practical engineering problems
Y1 - 2013
N1 - Coventry, Univ., Diss., 2013
ER -
TY - THES
A1 - Pfaff, Raphael
T1 - Automated processing of the ISL Doppler images
Y1 - 2007
N1 - Hagen, Fernuniv., Bachelorarbeit, 2007
ER -
TY - THES
A1 - Pfaff, Raphael
T1 - Modelling of nonlinear systems using piecewise defined models
Y1 - 2006
N1 - Coventry, Univ., Masterarbeit, 2006
ER -
TY - CHAP
A1 - Pfaff, Raphael
T1 - Analysis of Big Data Streams to obtain Braking Reliability Information for Train Protection systems
T2 - Asia-Pacific Conference of the Prognostics and Health Management Society
Y1 - 2017
N1 - Asia-Pacific Conference of the
Prognostics and Health Management Society, Jeju, Korea 2017
SP - 1
EP - 7
ER -
TY - JOUR
A1 - Pfaff, Raphael
T1 - Braking distance prediction for vehicle consist in low-speed on-sight operation: a Monte Carlo approach
JF - Railway Engineering Science
N2 - The first and last mile of a railway journey, in both freight and transit applications, constitutes a high effort and is either non-productive (e.g. in the case of depot operations) or highly inefficient (e.g. in industrial railways). These parts are typically managed on-sight, i.e. with no signalling and train protection systems ensuring the freedom of movement. This is possible due to the rather short braking distances of individual vehicles and shunting consists. The present article analyses the braking behaviour of such shunting units. For this purpose, a dedicated model is developed. It is calibrated on published results of brake tests and validated against a high-definition model for low-speed applications. Based on this model, multiple simulations are executed to obtain a Monte Carlo simulation of the resulting braking distances. Based on the distribution properties and established safety levels, the risk of exceeding certain braking distances is evaluated and maximum braking distances are derived. Together with certain parameters of the system, these can serve in the design and safety assessment of driver assistance systems and automation of these processes.
KW - Freight rail
KW - Shunting
KW - Braking curves
KW - Brake set-up
KW - Driver assistance system
Y1 - 2023
U6 - https://doi.org/10.1007/s40534-023-00303-7
SN - 2662-4753 (eISSN)
SN - 2662-4745 (Print)
VL - 31
IS - 2
SP - 135
EP - 144
PB - SpringerOpen
ER -
TY - CHAP
A1 - Peters, H.
A1 - Ziemons, Karl
A1 - Dammers, J.
A1 - Müller-Veggian, Mattea
ED - Nenonen, Jukka
T1 - Continuous head motion detection during MEG measurement using head location coils
T2 - Proceedings of the 12th International Conference on Biomagnetism : August 13 - 17, 2000, Helsinki University of Technology, Espoo, Finland
Y1 - 2001
SN - 951-22-5401-8
N1 - Biomag <12, 2000, Espoo> ; Teknillinen Korkeakoulu ; International Conference on Biomagnetism <12, 2000, Espoo>
PB - Helsinki Univ. of Technology, Laboratory of Biomedical Engineering
CY - Espoo
ER -
TY - JOUR
A1 - Penner, Crystal
A1 - Usherovich, Samuel
A1 - Niedermeier, Jana
A1 - Bélanger-Champagne, Camille
A1 - Trinczek, Michael
A1 - Paulßen, Elisabeth
A1 - Hoehr, Cornelia
T1 - Organic Scintillator-Fibre Sensors for Proton Therapy Dosimetry: SCSF-3HF and EJ-260
JF - electronics
N2 - In proton therapy, the dose from secondary neutrons to the patient can contribute to side effects and the creation of secondary cancer. A simple and fast detection system to distinguish between dose from protons and neutrons both in pretreatment verification as well as potentially in vivo monitoring is needed to minimize dose from secondary neutrons. Two 3 mm long, 1 mm diameter organic scintillators were tested for candidacy to be used in a proton–neutron discrimination detector. The SCSF-3HF (1500) scintillating fibre (Kuraray Co. Chiyoda-ku, Tokyo, Japan) and EJ-260 plastic scintillator (Eljen Technology, Sweetwater, TX, USA) were irradiated at the TRIUMF Neutron Facility and the Proton Therapy Research Centre. In the proton beam, we compared the raw Bragg peak and spread-out Bragg peak response to the industry standard Markus chamber detector. Both scintillator sensors exhibited quenching at high LET in the Bragg peak, presenting a peak-to-entrance ratio of 2.59 for the EJ-260 and 2.63 for the SCSF-3HF fibre, compared to 3.70 for the Markus chamber. The SCSF-3HF sensor demonstrated 1.3 times the sensitivity to protons and 3 times the sensitivity to neutrons as compared to the EJ-260 sensor. Combined with our equations relating neutron and proton contributions to dose during proton irradiations, and the application of Birks’ quenching correction, these fibres provide valid candidates for inexpensive and replicable proton-neutron discrimination detectors
Y1 - 2022
U6 - https://doi.org/10.3390/electronics12010011
SN - 2079-9292
N1 - This article belongs to the Special Issue "Applications of Optical Fiber Sensors"
VL - 12
IS - 1
PB - MDPI
CY - Basel
ER -
TY - CHAP
A1 - Penne, Jochen
A1 - Profittlich, Martin
A1 - Ringbeck, Thorsten
A1 - Buxbaum, Bernd
ED - D, Nicola D'Apuzzo
T1 - Touchless detailed 3D scan of human hand anatomy using time-of-flight cameras
T2 - Proceedings of the International Conference on 3D Body Scanning Technologies : Lugano, Switzerland, 19-20 October 2010
Y1 - 2010
SN - 978-3-033-02714-5
SP - 361
EP - 369
PB - Hometrica Consulting
CY - Zürich
ER -
TY - JOUR
A1 - Peloni, Alessandro
A1 - Dachwald, Bernd
A1 - Ceriotti, Matteo
T1 - Multiple near-earth asteroid rendezvous mission: Solar-sailing options
JF - Advances in Space Research
Y1 - 2017
U6 - https://doi.org/10.1016/j.asr.2017.10.017
SN - 0273-1177
IS - In Press, Corrected Proof
PB - Elsevier
CY - Amsterdam
ER -
TY - CHAP
A1 - Peloni, Alessandro
A1 - Dachwald, Bernd
A1 - Ceriotti, Matteo
T1 - Multiple NEA rendezvous mission: Solar sailing options
T2 - Fourth International Symposium on Solar Sailing
N2 - The scientific interest in near-Earth asteroids (NEAs) and the classification of some of those as potentially hazardous asteroid for the Earth stipulated the interest in NEA exploration. Close-up observations of these objects will increase drastically our knowledge about the overall NEA population. For this reason, a multiple NEA rendezvous mission through solar sailing is investigated, taking advantage of the propellantless nature of this groundbreaking propulsion technology. Considering a spacecraft based on the DLR/ESA Gossamer technology, this work focuses on the search of possible sequences of NEA encounters. The effectiveness of this approach is demonstrated through a number of fully-optimized trajectories. The results show that it is possible to visit five NEAs within 10 years with near-term solar-sail technology. Moreover, a study on a reduced NEA database demonstrates the reliability of the approach used, showing that 58% of the sequences found with an approximated trajectory model can be converted into real solar-sail trajectories. Lastly, this second study shows the effectiveness of the proposed automatic optimization algorithm, which is able to find solutions for a large number of mission scenarios without any input required from the user.
KW - Multiphase
KW - Trajectory Optimization
KW - Automated Optimization
KW - Gossamer
KW - Sequence-Search
Y1 - 2017
N1 - Fourth International Symposium on Solar Sailing (ISSS 2017), Kyoto, Japan, 17-20 Jan 2017.
http://www.jsforum.or.jp/ISSS2017/
SP - 1
EP - 11
ER -
TY - JOUR
A1 - Peloni, Alessandro
A1 - Ceriotti, Matteo
A1 - Dachwald, Bernd
T1 - Solar-sail trajectory design for a multiple near-earth-asteroid rendezvous mission
JF - Journal of Guidance, Control, and Dynamics
N2 - The scientific interest for near-Earth asteroids as well as the interest in potentially hazardous asteroids from the perspective of planetary defense led the space community to focus on near-Earth asteroid mission studies. A multiple near-Earth asteroid rendezvous mission with close-up observations of several objects can help to improve the characterization of these asteroids. This work explores the design of a solar-sail spacecraft for such a mission, focusing on the search of possible sequences of encounters and the trajectory optimization. This is done in two sequential steps: a sequence search by means of a simplified trajectory model and a set of heuristic rules based on astrodynamics, and a subsequent optimization phase. A shape-based approach for solar sailing has been developed and is used for the first phase. The effectiveness of the proposed approach is demonstrated through a fully optimized multiple near-Earth asteroid rendezvous mission. The results show that it is possible to visit five near-Earth asteroids within 10 years with near-term solar-sail technology.
Y1 - 2016
U6 - https://doi.org/10.2514/1.G000470
SN - 0731-5090
VL - 39
IS - 12
SP - 2712
EP - 2724
PB - AIAA
CY - Reston, Va.
ER -
TY - CHAP
A1 - Peloni, A.
A1 - Ceriotti, M.
A1 - Dachwald, Bernd
T1 - Preliminary trajectory design of a multiple NEO rendezvous mission through solar sailing
T2 - Proceedings of the International Astronautical Congress, IAC, Vol. 8, 2014
Y1 - 2015
SN - 978-1-63439-986-9
SP - 5352
EP - 5366
PB - Curran
CY - Red Hook, NY
ER -
TY - JOUR
A1 - Pellegrini, Paul A.
A1 - Howell, Nicholas R.
A1 - Shepherd, Rachael K.
A1 - Lengkeek, Nigel A.
A1 - Paulßen, Elisabeth
A1 - Katsifis, Andrew G.
A1 - Greguric, Ivan
T1 - Synthesis and Radiolabelling of DOTA-Linked Glutamine Analogues with 67,68Ga as Markers for Increased Glutamine Metabolism in Tumour Cells
JF - Molecules
Y1 - 2013
U6 - https://doi.org/10.3390/molecules18067160
SN - 1420-3049
VL - 18
IS - 6
SP - 7160
EP - 7178
PB - MDPI
CY - Basel
ER -
TY - JOUR
A1 - Peere, Wouter
A1 - Blanke, Tobias
ED - Vernon, Chris
T1 - GHEtool: An open-source tool for borefield sizing in Python
JF - Journal of Open Source Software
N2 - GHEtool is a Python package that contains all the functionalities needed to deal with borefield design. It is developed for both researchers and practitioners. The core of this package is the automated sizing of borefield under different conditions. The sizing of a borefield is typically slow due to the high complexity of the mathematical background. Because this tool has a lot of precalculated data, GHEtool can size a borefield in the order of tenths of milliseconds. This sizing typically takes the order of minutes. Therefore, this tool is suited for being implemented in typical workflows where iterations are required.
GHEtool also comes with a graphical user interface (GUI). This GUI is prebuilt as an exe-file because this provides access to all the functionalities without coding. A setup to install the GUI at the user-defined place is also implemented and available at: https://www.mech.kuleuven.be/en/tme/research/thermal_systems/tools/ghetool.
KW - geothermal
KW - energy
KW - borefields
KW - sizing
Y1 - 2022
U6 - https://doi.org/10.21105/joss.04406
SN - 2475-9066
VL - 7
IS - 76
SP - 1
EP - 4, 4406
ER -
TY - CHAP
A1 - Peeken, Heinz
A1 - Troeder, Christoph
A1 - Schmidt, J.
A1 - Rosenkranz, Josef
T1 - Principles of machine noise reduction
T2 - Inter-noise 85 : proceedings ; 1985 international conference on noise control engineering ; Munich, Sept. 18 - 20, 1985. - (Schriftenreihe der Bundesanstalt für Arbeitsschutz : Tagungsbericht ; 39)
Y1 - 1985
SN - 3-88314-417-7
SP - 23
EP - 36
PB - Bundesanstalt für Arbeitsschutz [u.a.]
CY - Dortmund [u.a.]
ER -
TY - CHAP
A1 - Peeken, Heinz
A1 - Troeder, Christoph
A1 - Benner, Joachim
A1 - Platt, Werner
T1 - A new approach to describe the mechanical performance of flexible couplings in drive systems
T2 - Proceedings of the International Conference on Rotordynamics : September 14 - 17, 1986, Tokyo
Y1 - 1986
N1 - International Conference on Rotordynamics <1986, Tōkyō>
SP - 159
EP - 163
PB - IFToMM
CY - Tokyo
ER -
TY - JOUR
A1 - Pawelke, Siegfried
A1 - Schmitt, W.
A1 - Meissen, Th.
T1 - Aachen 3D finger. 3D digitizer for application in dentistry / Schmitt, W. ; Pawelke, S. ; Meissen, Th.
JF - Biomedizinische Technik. 35 (1990), H. 4
Y1 - 1990
SN - 0013-5585
SP - 69
EP - 71
ER -
TY - JOUR
A1 - Pawelke, Siegfried
A1 - Butzer, Paul L.
T1 - Semi-groups and resolvent operators
JF - Archive for Rational Mechanics and Analysis
KW - Resolvent Operator
KW - Electromagnetism
KW - Complex System
KW - Neural Network
KW - Nonlinear Dynamics
Y1 - 1968
U6 - https://doi.org/10.1007/BF00250941
SN - 0003-9527
VL - 30
IS - 2
SP - 127
EP - 147
PB - Springer
CY - Berlin
ER -
TY - JOUR
A1 - Pawelke, Siegfried
T1 - Weak smoothness conditions for the uniform convergence of Fourier-Jacobi series
JF - Functiones et Approximatio. Commentarii Mathematici. 9 (1980)
Y1 - 1980
SN - 0208-6573
N1 - Zentralblatt MATH: http://www.emis.de/MATH-item?0471.42018
SP - 9
EP - 13
ER -
TY - JOUR
A1 - Pawelke, Siegfried
T1 - Note on Jackson and Bernstein type approximation theorems in the case of approximation by algebraic polynomial in the spaces L and C
JF - Studia Scientiarum Mathematicarum Hungarica. 36 (2000), H. 3-4
Y1 - 2000
SN - 0081-6906
SP - 353
EP - 358
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Schweighöfer, Philip V.
A1 - Abram, Ulrich
T1 - Reactions of [ReOX3(PPh3)2] Complexes (X = Cl, Br) with Phenylacetylene and the Structures of the Products
JF - Zeitschrift für anorganische und allgemeine Chemie : ZAAC = Journal of inorganic and general chemistry
N2 - Oxorhenium(V) complexes [ReOX3(PPh3)2] (X = Cl, Br) react with phenylacetylene under formation of complexes with ylide-type ligands. Compounds of the compositions [ReOCl3(PPh3){C(Ph)C(H)(PPh3)}] (1), [ReOBr3(OPPh3){C(Ph)C(H)(PPh3)}] (2), and [ReOBr3(OPPh3){C(H)C(Ph)(PPh3)}] (3) were isolated and characterized by X-ray diffraction. They contain a ligand, which was formed by a nucleophilic attack of released PPh3 at coordinated phenylacetylene. The structures of the products show that there is no preferable position for this attack. Cleavage of the Re–C bond in 3 and dimerization of the organic ligand resulted in the formation of the [{(PPh3)(H)CC(Ph)}2]2+ cation, which crystallized as its [(ReOBr4)(OReO3)]2– salt.
Y1 - 2010
U6 - https://doi.org/10.1002/zaac.200900478
SN - 1521-3749
VL - 636
IS - 5
SP - 779
EP - 783
PB - Wiley-VCH
CY - Weinheim
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Ngyugen, Hung Huy
A1 - Kahlcke, Nils
A1 - Deflon, Victor M.
A1 - Abram, Ulrich
T1 - Tricarbonyltechnetium(I) and -rhenium(I) complexes with N′-thiocarbamoylpicolylbenzamidines
JF - Polyhedron
N2 - N,N-Dialkylamino(thiocarbonyl)-N′-picolylbenzamidines react with (NEt4)2[M(CO)3X3] (M = Re, X = Br; M = Tc, X = Cl) under formation of neutral [M(CO)3L] complexes in high yields. The monoanionic NNS ligands bind in a facial coordination mode and can readily be modified at the (CS)NR1R2 moiety. The complexes [99Tc(CO)3(LPyMor)] and [Re(CO)3(L)] (L = LPyMor, LPyEt) were characterized by X-ray diffraction. Reactions of [99mTc(CO)3(H2O)3]+ with the N′-thiocarbamoylpicolylbenzamidines give the corresponding 99mTc complexes. The ester group in HLPyCOOEt allows linkage between biomolecules and the metal core.
Y1 - 2012
U6 - https://doi.org/10.1016/j.poly.2012.04.008
SN - 0277-5387
VL - 40
IS - 1
SP - 153
EP - 158
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Lengkeek, Nigel A.
A1 - Le, Van So
A1 - Pellegrini, Paul A.
A1 - Greguric, Ivan
A1 - Weiner, Ron
T1 - The role of additives in moderating the influence of Fe(III) and Cu(II) on the radiochemical yield of [⁶⁸Ga(DOTATATE)]
JF - Applied Radiation and Isotopes
N2 - [⁶⁸Ga(DOTATATE)] has demonstrated its clinical usefulness. Both Fe³⁺ and Cu²⁺, potential contaminants in Gallium-68 generator eluent, substantially reduce the radiochemical (RC) yield of [⁶⁸Ga(DOTATATE)] if the metal/ligand ratio of 1:1 is exceeded. A variety of compounds were examined for their potential ability to reduce this effect. Most had no effect on RC yield. However, addition of phosphate diminished the influence of Fe³⁺ by likely forming an insoluble iron salt. Addition of ascorbic acid reduced Cu²⁺ and Fe³⁺ to Cu⁺ and Fe²⁺ respectively, both of which have limited impact on RC yields. At low ligand amounts (5 nmol DOTATATE), the addition of 30 nmol phosphate (0.19 mM) increased the tolerance of Fe3⁺ from 4 nmol to 10 nmol (0.06 mM), while the addition of ascorbic acid allowed high RC yields (>95%) in the presence of 40 nmol Fe³⁺ (0.25 mM) and 100 nmol Cu²⁺ (0.63 mM). The effect of ascorbic acid was highly pH-dependant, and gave optimal results at pH 3.
Y1 - 2016
U6 - https://doi.org/10.1016/j.apradiso.2015.09.008
SN - 1872-9800
VL - 107
SP - 13
EP - 16
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Le, Van So
A1 - Lengkeek, Nigel
A1 - Pellegrini, Paul
A1 - Jackson, Tim
A1 - Greguric, Ivan
A1 - Weiner, Ron
T1 - Influence of Metal Ions on the 68Ga-labeling of DOTATATE
JF - Applied Radiation and Isotopes
Y1 - 2013
U6 - https://doi.org/10.1016/j.apradiso.2013.08.010
SN - 1872-9800
VL - 82
SP - 232
EP - 238
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Kückmann, Theresa
A1 - Abram, Ulrich
T1 - Silver(I) Complexes of 1,3-Dialkyl-4,5-dimethylimidazol-2-ylidenes and their Use as Precursors for the Synthesis of Rhenium(V) NHC Complexes
JF - Zeitschrift für anorganische und allgemeine Chemie : ZAAC = Journal of inorganic and general chemistry
Y1 - 2007
U6 - https://doi.org/10.1002/zaac.200700021
SN - 1521-3749
VL - 633
IS - 5-6
SP - 830
EP - 834
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Kong, Shushu
A1 - Arciszewski, Pawel
A1 - Wielbalck, Swantje
A1 - Abram, Ulrich
T1 - Aryl and NHC Compounds of Technetium and Rhenium
JF - Journal of the American Chemical Society
N2 - Air- and water-stable phenyl complexes with nitridotechnetium(V) cores can be prepared by straightforward procedures. [TcNPh2(PPh3)2] is formed by the reaction of [TcNCl2(PPh3)2] with PhLi. The analogous N-heterocyclic carbene (NHC) compound [TcNPh2(HLPh)2], where HLPh is 1,3,4-triphenyl-1,2,4-triazol-5-ylidene, is available from (NBu4)[TcNCl4] and HLPh or its methoxo-protected form. The latter compound allows the comparison of different Tc–C bonds within one compound. Surprisingly, the Tc chemistry with such NHCs does not resemble that of corresponding Re complexes, where CH activation and orthometalation dominate.
Y1 - 2012
U6 - https://doi.org/10.1021/ja3033718
SN - 1520-5126
VL - 134
IS - 22
SP - 9118
EP - 9121
PB - ACS Publications
CY - Washington, DC
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Hoehr, Cornelia
A1 - Hou, Xinchi
A1 - Hanemaayer, Victoire
A1 - Zeisler, Stefan
A1 - Adam, Michael J.
A1 - Ruth, Thomas J.
A1 - Celler, Anna
A1 - Buckley, Ken
A1 - Benard, Francois
A1 - Schaffer, Paul
T1 - Production of Y-86 and other radiometals for research purposes using a solution target system
JF - Nuclear medicine and biology
Y1 - 2015
U6 - https://doi.org/10.1016/j.nucmedbio.2015.06.005
SN - 1872-9614
VL - 42
IS - 11
SP - 842
EP - 849
PB - Elsevier
CY - Amsterdam
ER -
TY - JOUR
A1 - Paulßen, Elisabeth
A1 - Alberto, Roger
A1 - Abram, Ulrich
T1 - Synthesis, Characterization, and Structures of R3EOTcO3 Complexes (E = C, Si, Ge, Sn, Pb) and Related Compounds
JF - Inorganic Chemistry
N2 - AgTcO4 reacts with R3ECl compounds (E = C, Si, Ge, Sn, Pb; R = Me, iPr, tBu, Ph), tBu2SnCl2, or PhMgCl under formation of novel trioxotechnetium(VII) derivatives. The carbon and silicon derivatives readily undergo decomposition, which was proven by 99Tc NMR spectroscopy and the isolation of decomposition products such as [TcOCl3(THF)(OH2)]. Compounds [Ph3GeOTcO3], [(THF)Ph3SnOTcO3], [(O3TcO)SntBu2(OH)]2, and [(THF)4Mg(OTcO3)2] are more stable and were isolated in crystalline form and characterized by X-ray diffraction.
Y1 - 2010
U6 - https://doi.org/10.1021/ic1001094
SN - 1520-510X
VL - 49
IS - 7
SP - 3525
EP - 3530
PB - American Chemical Society
CY - Washington
ER -
TY - CHAP
A1 - Paulsen, Svea
A1 - Hoffstadt, Kevin
A1 - Krafft, Simone
A1 - Leite, A.
A1 - Zang, J.
A1 - Fonseca-Zang, W.
A1 - Kuperjans, Isabel
T1 - Continuous biogas production from sugarcane as sole substrate
T2 - Energy Reports
N2 - A German–Brazilian research project investigates sugarcane as an energy plant in anaerobic digestion for biogas production. The aim of the project is a continuous, efficient, and stable biogas process with sugarcane as the substrate. Tests are carried out in a fermenter with a volume of 10 l.
In order to optimize the space–time load to achieve a stable process, a continuous process in laboratory scale has been devised. The daily feed in quantity and the harvest time of the substrate sugarcane has been varied. Analyses of the digester content were conducted twice per week to monitor the process: The ratio of inorganic carbon content to volatile organic acid content (VFA/TAC), the concentration of short-chain fatty acids, the organic dry matter, the pH value, and the total nitrogen, phosphate, and ammonium concentrations were monitored. In addition, the gas quality (the percentages of CO₂, CH₄, and H₂) and the quantity of the produced gas were analyzed.
The investigations have exhibited feasible and economical production of biogas in a continuous process with energy cane as substrate. With a daily feeding rate of 1.68gᵥₛ/l*d the average specific gas formation rate was 0.5 m3/kgᵥₛ. The long-term study demonstrates a surprisingly fast metabolism of short-chain fatty acids. This indicates a stable and less susceptible process compared to other substrates.
Y1 - 2020
U6 - https://doi.org/10.1016/j.egyr.2019.08.035
N1 - 6th International Conference on Energy and Environment Research, ICEER 2019, 22–25 July, University of Aveiro, Portugal
VL - 6
IS - Supplement 1
SP - 153
EP - 158
PB - Elsevier
ER -
TY - JOUR
A1 - Pasteur, Aline
A1 - Tippkötter, Nils
A1 - Kampeis, Percy
A1 - Ulber, Roland
T1 - Optimization of high gradient magnetic separation filter units for the purification of fermentation products
JF - IEEE TRANSACTIONS ON MAGNETICS
N2 - High gradient magnetic separation (HGMS) has been established since the early 1970s. A more recent application of these systems is the use in bioprocesses. To integrate the HGMS in a fermentation process, it is necessary to optimize the separation matrix with regard to the magnetic separation characteristics and permeability of the non-magnetizable components of the fermentation broth. As part of the work presented here, a combined fluidic and magnetic force finite element model simulation was created using the software COMSOL Multiphysics and compared with separation experiments. Finally, as optimal lattice orientation of the separation matrix, a transversal rhombohedral arrangement was defined. The high suitability of the new filter matrix has been verified by separation experiments.
Y1 - 2014
U6 - https://doi.org/10.1109/TMAG.2014.2325535
SN - 0018-9464
N1 - Article Sequence Number: 5000607
INSPEC Accession Number: 14663042
VL - 50
IS - 10
SP - Artikel 5000607
PB - IEEE
CY - New York, NY
ER -
TY - JOUR
A1 - Parl, C.
A1 - Larue, H.
A1 - Streun, M.
A1 - Ziemons, Karl
T1 - Double-side-readout technique for SiPM-matrices
JF - 2010 IEEE Nuclear Science Symposium Conference Record (NSS/MIC)
N2 - In our case the double-side-method is used to minimize the complexity of a matrix-readout. Here the number of channels is reduced to 2√N̅. It is also possible to benefit from the method in a single pixel readout system. One signal can be used to measure position and energy of the event, the other one can be applied to a fast trigger-circuit at the same time. In a next step we will investigate timing behavior and electrical crosstalk of the circuit.
Y1 - 2011
SN - 1095-7863
SP - 1486
EP - 1487
PB - IEEE
CY - New York
ER -
TY - CHAP
A1 - Park, Jin
A1 - El-Daib, Khaled
A1 - Butenweg, Christoph
A1 - Gellert, Christoph
T1 - A novel macroelement approach for masonry walls
T2 - Proceedings of the 8th International Conference on Structural Dynamics, EURODYN 2011 : Leuven, Belgium, 4 - 6 July 2011 / Katholieke Universiteit Leuven, ... G. De Roeck ... (eds)
Y1 - 2011
SN - 978-90-76019-31-4
SP - 3281
EP - 3286
PB - K. U. Leuven, Dep. of Civil Engineering
CY - Leuven
ER -
TY - JOUR
A1 - Panc, Nicolae
A1 - Contiu, Glad
A1 - Bocanet, Vlad
A1 - Thurn, Laura
A1 - Sabau, Emilia
T1 - The influence of cutting technology on surface wear hardness
JF - Academic Journal of Manufacturing Engineering
Y1 - 2019
SN - 1583-7904
VL - 17
IS - 3
SP - 205
EP - 210
ER -
TY - JOUR
A1 - Palmer, J. W.
A1 - Lindemann, Markus
T1 - Business models and market mechanisms : evaluating efficiency in consumer electronic markets
JF - Data base and advanced information systems. Bd. 34 (2003), H. 2
Y1 - 2003
SN - 0105-9912
SP - 23
EP - 38
ER -
TY - CHAP
A1 - Pak, Daniel
A1 - Piegeler, D.
A1 - Feldmann, Markus
A1 - Schleser, Markus
A1 - Dilthey, Ulrich
ED - Hegger, Josef
T1 - Hybrid joints of textile reinforced concrete parts - designed for assembly
T2 - Textile reinforced concrete : proceedings of the 1. International RILEM Conference, held at the RWTH Aachen, September 6/7, 2006. (RILEM proceedings ; 50)
Y1 - 2006
SN - 2-912143-97-7
SP - 181
EP - 190
PB - RILEM Publ.
CY - Bagneux
ER -
TY - JOUR
A1 - Paczkowski, Sebastian
A1 - Weißbecker, Bernhard
A1 - Schöning, Michael Josef
A1 - Schütz, Stefan
T1 - Biosensors on the Basis of Insect Olfaction
JF - Insect biotechnology / Andreas Vilcinskas, ed.
Y1 - 2011
SN - 978-90-481-9640-1
N1 - Biologically-inspired system ; 2
SP - 225
EP - 240
PB - Springer
CY - Dordrecht [u.a.]
ER -
TY - JOUR
A1 - Oßmann, Martin
A1 - Kazay, B.
T1 - Simple circuit provides high-side current sensing / Ossmann, M ; Kazay, B.
JF - EDN. 45 (2000), H. 21
Y1 - 2000
SN - 0012-7515
SP - 200
EP - 200
ER -
TY - JOUR
A1 - Oßmann, Martin
A1 - Kazay, B.
T1 - Single mu C pin makes half-duplex RS-232C / Ossmann, M
JF - EDN. 44 (1999), H. 16
Y1 - 1999
SN - 0012-7515
SP - 118
ER -
TY - JOUR
A1 - Oßmann, Martin
A1 - Hattrup, C.
A1 - Broeck, H. W. van der
T1 - Fast estimation techniques for digital control of resonant converters / Hattrup, C.; van der Broeck, H.W.; Ossmann, M.;
JF - IEEE Transaction on Power Electronics. 18 (2003), H. 1
Y1 - 2003
SN - 0885-8993
N1 - Part 2
SP - 365
EP - 372
ER -
TY - JOUR
A1 - Overduin, James
A1 - Blome, Hans-Joachim
A1 - Hoell, Josef
T1 - Wolfgang Priester: from the big bounce to the Lambda-dominated universe
JF - Naturwissenschaften
Y1 - 2007
SN - 0028-1042
VL - 94
IS - 6
SP - 417
EP - 429
ER -
TY - JOUR
A1 - Otten, Dennis
A1 - Weber, Tobias
A1 - Arent, Jan-Christoph
T1 - Manufacturing Process Simulation – On Its Way to Industrial Application
JF - International Journal of Aviation, Aeronautics, and Aerospace
N2 - Manufacturing process simulation (MPS) has become more and more important for aviation and the automobile industry. A highly competitive market requires the use of high performance metals and composite materials in combination with reduced manufacturing cost and time as well as a minimization of the time to market for a new product. However, the use of such materials is expensive and requires sophisticated manufacturing processes. An experience based process and tooling design followed by a lengthy trial-and-error optimization is just not contemporary anymore. Instead, a tooling design process aided by simulation is used more often. This paper provides an overview of the capabilities of MPS in the fields of sheet metal forming and prepreg autoclave manufacturing of composite parts summarizing the resulting benefits for tooling design and manufacturing engineering. The simulation technology is explained briefly in order to show several simplification and optimization techniques for developing industrialized simulation approaches. Small case studies provide examples of an efficient application on an industrial scale.
Y1 - 2018
U6 - https://doi.org/10.15394/ijaaa.2018.1217
SN - 2374-6793
VL - 5
IS - 2
PB - Embry-Riddle Aeronautical University
CY - Daytona Beach, Fla.
ER -
TY - CHAP
A1 - Otten, D.
A1 - Schmidt, M.
A1 - Weber, Tobias
T1 - Advances in Determination of Material Parameters for Functional Simulations Based on Process Simulations
T2 - SAMPE Europe Conference 16 Liege
Y1 - 2016
SN - 978-1-5108-3800-0
SP - 570
EP - 577
ER -
TY - CHAP
A1 - Otten, D.
A1 - Schmid, M.
A1 - Weber, Tobias
T1 - Advances In Sheet Metal-Forming: Reduction Of Tooling Cost By Methodical Optimization
T2 - Proceedings of SAMPE Europe Conference, Amiens , France
Y1 - 2015
ER -
TY - CHAP
A1 - Ostkotte, Sebastian
A1 - Peters, Constantin
A1 - Hüning, Felix
A1 - Bragard, Michael
T1 - Design, implementation and verification of an rotational incremental position encoder based on the magnetic Wiegand effect
T2 - 2022 ELEKTRO (ELEKTRO)
N2 - This paper covers the use of the magnetic Wiegand effect to design an innovative incremental encoder. First, a theoretical design is given, followed by an estimation of the achievable accuracy and an optimization in open-loop operation.
Finally, a successful experimental verification is presented. For this purpose, a permanent magnet synchronous machine is controlled in a field-oriented manner, using the angle information of the prototype.
KW - Position Encoder
KW - Rotational Encoder
KW - Wiegand Effect
KW - Angle Sensor
KW - Incremental Encoder
Y1 - 2022
SN - 978-1-6654-6726-1
SN - 978-1-6654-6727-8
U6 - https://doi.org/10.1109/ELEKTRO53996.2022.9803477
SN - 2691-0616
N1 - 2022 ELEKTRO (ELEKTRO), 23-26 Mai 2022, Krakow, Poland.
PB - IEEE
ER -
TY - CHAP
A1 - Osterhage, Hannes
A1 - Bialonski, Stephan
A1 - Staniek, Matthäus
A1 - Schindler, Kaspar
A1 - Wagner, Tobias
A1 - Elger, Christian E.
A1 - Lehnertz, Klaus
T1 - Bivariate and multivariate time series analysis techniques and their potential impact for seizure prediction
T2 - Seizure Prediction in Epilepsy: From Basic Mechanisms to Clinical Applications
Y1 - 2008
SN - 978-3-527-62519-2
U6 - https://doi.org/10.1002/9783527625192.ch15
SP - 189
EP - 208
PB - Wiley-VCH
CY - Weinheim
ER -
TY - JOUR
A1 - Orzada, Stephan
A1 - Solbach, Klaus
A1 - Gratz, Marcel
A1 - Brunheim, Sascha
A1 - Fiedler, Thomas M.
A1 - Johst, Sören
A1 - Bitz, Andreas
A1 - Shooshtary, Samaneh
A1 - Abuelhaija, Ashraf
A1 - Voelker, Maximilian N.
A1 - Rietsch, Stefan H. G.
A1 - Kraff, Oliver
A1 - Maderwald, Stefan
A1 - Flöser, Martina
A1 - Oehmingen, Mark
A1 - Quick, Harald H.
A1 - Ladd, Mark E.
T1 - A 32-channel parallel transmit system add-on for 7T MRI
JF - Plos one
Y1 - 2019
U6 - https://doi.org/10.1371/journal.pone.0222452
ER -
TY - JOUR
A1 - Orzada, Stephan
A1 - Maderwald, Stefan
A1 - Poser, Benedikt Andreas
A1 - Bitz, Andreas
A1 - Quick, Harald H.
A1 - Ladd, Mark E.
T1 - RF excitation using time interleaved acquisition of modes (TIAMO) to address B1 inhomogeneity in high-field MRI
JF - Magnetic Resonance in Medicine
N2 - As the field strength and, therefore, the operational frequency in MRI is increased, the wavelength approaches the size of the human head/body, resulting in wave effects, which cause signal decreases and dropouts. Several multichannel approaches have been proposed to try to tackle these problems, including RF shimming, where each element in an array is driven by its own amplifier and modulated with a certain (constant) amplitude and phase relative to the other elements, and Transmit SENSE, where spatially tailored RF pulses are used. In this article, a relatively inexpensive and easy to use imaging scheme for 7 Tesla imaging is proposed to mitigate signal voids due to B1 field inhomogeneity. Two time-interleaved images are acquired using a different excitation mode for each. By forming virtual receive elements, both images are reconstructed together using GRAPPA to achieve a more homogeneous image, with only small SNR and SAR penalty in head and body imaging at 7 Tesla.
Y1 - 2010
U6 - https://doi.org/10.1002/mrm.22527
SN - 1522-2594
VL - 64
IS - 2
SP - 327
EP - 333
PB - Wiley-Liss
CY - New York
ER -
TY - JOUR
A1 - Orzada, Stephan
A1 - Ladd, Mark E.
A1 - Bitz, Andreas
T1 - A method to approximate maximum local SAR in multichannel transmit MR systems without transmit phase information
JF - Magnetic Resonance in Medicine
N2 - Purpose
To calculate local specific absorption rate (SAR) correctly, both the amplitude and phase of the signal in each transmit channel have to be known. In this work, we propose a method to derive a conservative upper bound for the local SAR, with a reasonable safety margin without knowledge of the transmit phases of the channels.
Methods
The proposed method uses virtual observation points (VOPs). Correction factors are calculated for each set of VOPs that prevent underestimation of local SAR when the VOPs are applied with the correct amplitudes but fixed phases.
Results
The proposed method proved to be superior to the worst-case calculation based on the maximum eigenvalue of the VOPs. The mean overestimation for six coil setups could be reduced, whereas no underestimation of the maximum local SAR occurred. In the best investigated case, the overestimation could be reduced from a factor of 3.3 to a factor of 1.7.
Conclusion
The upper bound for the local SAR calculated with the proposed method allows a fast estimation of the local SAR based on power measurements in the transmit channels and facilitates SAR monitoring in systems that do not have the capability to monitor transmit phases
Y1 - 2016
U6 - https://doi.org/10.1002/mrm.26398
SN - 1522-2594
VL - 78
IS - 2
SP - 805
EP - 811
PB - International Society for Magnetic Resonance in Medicine
ER -
TY - JOUR
A1 - Orzada, Stephan
A1 - Johst, Sören
A1 - Maderwald, Stefan
A1 - Bitz, Andreas
A1 - Solbach, Klaus
A1 - Ladd, Mark E.
T1 - Mitigation of B1(+) inhomogeneity on single-channel transmit systems with TIAMO
JF - Magnetic Resonance in Medicine
Y1 - 2013
U6 - https://doi.org/10.1002/mrm.24453
SN - 1522-2594
VL - 70
IS - 1
SP - 290
EP - 294
PB - Wiley
CY - Weinheim
ER -
TY - JOUR
A1 - Orzada, Stephan
A1 - Fiedler, Thomas M.
A1 - Bitz, Andreas
A1 - Ladd, Mark E.
A1 - Quick, Harald H.
T1 - Local SAR compression with overestimation control to reduce maximum relative SAR overestimation and improve multi-channel RF array performance
JF - Magnetic Resonance Materials in Physics, Biology and Medicine
N2 - Objective
In local SAR compression algorithms, the overestimation is generally not linearly dependent on actual local SAR. This can lead to large relative overestimation at low actual SAR values, unnecessarily constraining transmit array performance.
Method
Two strategies are proposed to reduce maximum relative overestimation for a given number of VOPs. The first strategy uses an overestimation matrix that roughly approximates actual local SAR; the second strategy uses a small set of pre-calculated VOPs as the overestimation term for the compression.
Result
Comparison with a previous method shows that for a given maximum relative overestimation the number of VOPs can be reduced by around 20% at the cost of a higher absolute overestimation at high actual local SAR values.
Conclusion
The proposed strategies outperform a previously published strategy and can improve the SAR compression where maximum relative overestimation constrains the performance of parallel transmission.
Y1 - 2020
SN - 1352-8661
U6 - https://doi.org/10.1007/s10334-020-00890-0
IS - 34 (2021)
SP - 153
EP - 164
PB - Springer
CY - Heidelberg
ER -