TY  - JOUR
A1  - Eckert, Alexander
A1  - Abbasi, Mozhdeh
A1  - Mang, Thomas
A1  - Saalwächter, Kay
A1  - Walther, Andreas
T1  - Structure, Mechanical Properties, and Dynamics of Polyethylenoxide/Nanoclay Nacre-Mimetic Nanocomposites
JF  - Macromolecules
N2  - Nacre-mimetic nanocomposites based on high fractions of synthetic high-aspect-ratio nanoclays in combination with polymers are continuously pushing boundaries for advanced material properties, such as high barrier against oxygen, extraordinary mechanical behavior, fire shielding, and glass-like transparency. Additionally, they provide interesting model systems to study polymers under nanoconfinement due to the well-defined layered nanocomposite arrangement. Although the general behavior in terms of forming such layered nanocomposite materials using evaporative self-assembly and controlling the nanoclay gallery spacing by the nanoclay/polymer ratio is understood, some combinations of polymer matrices and nanoclay reinforcement do not comply with the established models. Here, we demonstrate a thorough characterization and analysis of such an unusual polymer/nanoclay pair that falls outside of the general behavior. Poly(ethylene oxide) (PEO) and sodium fluorohectorite form nacre-mimetic, lamellar nanocomposites that are completely transparent and show high mechanical stiffness and high gas barrier, but there is only limited expansion of the nanoclay gallery spacing when adding increasing amounts of polymer. This behavior is maintained for molecular weights of PEO varied over four orders of magnitude and can be traced back to depletion forces. By careful investigation via X-ray diffraction and proton low-resolution solid-state NMR, we are able to quantify the amount of mobile and immobilized polymer species in between the nanoclay galleries and around proposed tactoid stacks embedded in a PEO matrix. We further elucidate the unusual confined polymer dynamics, indicating a relevant role of specific surface interactions.
Y1  - 2020
U6  - http://dx.doi.org/10.1021/acs.macromol.9b01931
SN  - 1520-5835
VL  - 53
IS  - 5
SP  - 1716
EP  - 1725
PB  - ACS Publications
CY  - Washington, DC
ER  - 
TY  - BOOK
A1  - Lohse, Wolfram
A1  - Laumann, Jörg
A1  - Wolf, Christian
T1  - Stahlbau 2
Y1  - 2020
SN  - 978-3-8348-2116-4
SN  - 978-3-8348-1511-8
U6  - http://dx.doi.org/10.1007/978-3-8348-2116-4
PB  - Springer Vieweg
CY  - Wiesbaden
ET  - 21., vollst. akt. und überarb. Aufl.
ER  - 
TY  - JOUR
A1  - Gazda, Quentin
A1  - Maurischat, Andreas
T1  - Special functions and Gauss-Thakur sums in higher rank and dimension
Y1  - 2020
PB  - De Gruyter
CY  - Berlin
ER  - 
TY  - CHAP
A1  - Kasch, Susanne
A1  - Schmidt, Thomas
A1  - Eichler, Fabian
A1  - Thurn, Laura
A1  - Jahn, Simon
A1  - Bremen, Sebastian
T1  - Solution approaches and process concepts for powder bed-based melting of glass
T2  - Industrializing Additive Manufacturing. Proceedings of AMPA2020
N2  - In the study, the process chain of additive manufacturing by means of powder bed fusion will be presented based on the material glass. In order to reliably process components additively, new concepts with different solutions were developed and investigated.

Compared to established metallic materials, the properties of glass materials differ significantly. Therefore, the process control was adapted to the material glass in the investigations. With extensive parameter studies based on various glass powders such as borosilicate glass and quartz glass, scientifically proven results on powder bed fusion of glass are presented. Based on the determination of the particle properties with different methods, extensive investigations are made regarding the melting behavior of glass by means of laser beams. Furthermore, the experimental setup was steadily expanded. In addition to the integration of coaxial temperature measurement and regulation, preheating of the building platform is of major importance. This offers the possibility to perform 3D printing at the transformation temperatures of the glass materials. To improve the component’s properties, the influence of a subsequent heat treatment was also investigated.

The experience gained was incorporated into a new experimental system, which allows a much better exploration of the 3D printing of glass. Currently, studies are being conducted to improve surface texture, building accuracy, and geometrical capabilities using three-dimensional specimen.

The contribution shows the development of research in the field of 3D printing of glass, gives an insight into the machine and process engineering as well as an outlook on the possibilities and applications.
KW  - Glass powder
KW  - Laser processing
KW  - Additive manufacturing
KW  - Melting
KW  - L-PBF
Y1  - 2020
SN  - 978-3-030-54333-4 (Print)
SN  - 978-3-030-54334-1 (Online)
U6  - http://dx.doi.org/10.1007/978-3-030-54334-1_7
N1  - International Conference on Additive Manufacturing in Products and Applications. 01.-03. September 2020. Zurich, Switzerland
SP  - 82
EP  - 95
PB  - Springer
CY  - Cham
ER  - 
TY  - CHAP
A1  - Michel, Philipp
A1  - Rosin, Julia
A1  - Butenweg, Christoph
A1  - Klinkel, Sven
T1  - Soil-dependent earthquake spectra in the analysis of liquid-storage-tanks on compliant soil
T2  - Seismic design of industrial facilities 2020: proceedings of the 2nd International Conference on Seismic Design of Industrial Facilities (SeDIF-Conference)
Y1  - 2020
SN  - 978-3-86359-729-0
SP  - 245
EP  - 254
ER  - 
TY  - JOUR
A1  - Dadfar, Dryed Mohammadali
A1  - Camozzi, Denise
A1  - Darguzyte, Milita
A1  - Roemhild, Karolin
A1  - Varvarà, Paola
A1  - Metselaar, Josbert
A1  - Banala, Srinivas
A1  - Straub, Marcel
A1  - Güver, Nihan
A1  - Engelmann, Ulrich M.
A1  - Slabu, Ioana
A1  - Buhl, Miriam
A1  - Leusen, Jan van
A1  - Kögerler, Paul
A1  - Hermanns-Sachweh, Benita
A1  - Schulz, Volkmar
A1  - Kiessling, Fabian
A1  - Lammers, Twan
T1  - Size-isolation of superparamagnetic iron oxide nanoparticles improves MRI, MPI and hyperthermia performance
JF  - Journal of Nanobiotechnology
N2  - Superparamagnetic iron oxide nanoparticles (SPION) are extensively used for magnetic resonance imaging (MRI) and magnetic particle imaging (MPI), as well as for magnetic fluid hyperthermia (MFH). We here describe a sequential centrifugation protocol to obtain SPION with well-defined sizes from a polydisperse SPION starting formulation, synthesized using the routinely employed co-precipitation technique. Transmission electron microscopy, dynamic light scattering and nanoparticle tracking analyses show that the SPION fractions obtained upon size-isolation are well-defined and almost monodisperse. MRI, MPI and MFH analyses demonstrate improved imaging and hyperthermia performance for size-isolated SPION as compared to the polydisperse starting mixture, as well as to commercial and clinically used iron oxide nanoparticle formulations, such as Resovist® and Sinerem®. The size-isolation protocol presented here may help to identify SPION with optimal properties for diagnostic, therapeutic and theranostic applications.
Y1  - 2020
U6  - http://dx.doi.org/10.1186/s12951-020-0580-1
SN  - 1477-3155
VL  - 18
IS  - Article number 22
SP  - 1
EP  - 13
PB  - Nature Portfolio
ER  - 
TY  - CHAP
A1  - Ulmer, Jessica
A1  - Braun, Sebastian
A1  - Cheng, Chi-Tsun
A1  - Dowey, Steve
A1  - Wollert, Jörg
T1  - Simulation und Verifikation komplexer Handarbeitsprozesse durch die Kombination von Virtual Reality und Augmented Reality im Single-Piece-Workflow
T2  - AALE 2020, 17. Fachkonferenz Angewandte Automatisierungstechnik in Lehre und Entwicklung, Automatisierung und Mensch-Technik-Interaktion, Leipzig, DE, 4.-6.3.2020
Y1  - 2020
SN  - 978-3-8007-5180-8
SP  - 1
EP  - 4
ER  - 
TY  - JOUR
A1  - Keller, Johannes
A1  - Rath, Volker
A1  - Bruckmann, Johanna
A1  - Mottaghy, Darius
A1  - Clauser, Christoph
A1  - Wolf, Andreas
A1  - Seidler, Ralf
A1  - Bücker, H. Martin
A1  - Klitzsch, Norbert
T1  - SHEMAT-Suite: An open-source code for simulating flow, heat and species transport in porous media
JF  - SoftwareX
N2  - SHEMAT-Suite is a finite-difference open-source code for simulating coupled flow, heat and species transport in porous media. The code, written in Fortran-95, originates from geoscientific research in the fields of geothermics and hydrogeology. It comprises: (1) a versatile handling of input and output, (2) a modular framework for subsurface parameter modeling, (3) a multi-level OpenMP parallelization, (4) parameter estimation and data assimilation by stochastic approaches (Monte Carlo, Ensemble Kalman filter) and by deterministic Bayesian approaches based on automatic differentiation for calculating exact (truncation error-free) derivatives of the forward code.
Y1  - 2020
U6  - http://dx.doi.org/10.1016/j.softx.2020.100533
SN  - 2352-7110
VL  - 12
PB  - Elsevier
CY  - Amsterdam
ER  - 
TY  - JOUR
A1  - Eggert, Mathias
A1  - Moulen, Tobias
T1  - Selektion von Geschäftsprozessen zur Anwendung von Robotic Process Automation am Beispiel einer Versicherung
JF  - HMD Praxis der Wirtschaftsinformatik
N2  - Häufig bremsen geringe IT-Ressourcen, fehlende Softwareschnittstellen oder eine veraltete und komplex gewachsene Systemlandschaft die Automatisierung von Geschäftsprozessen. Robotic Process Automation (RPA) ist eine vielversprechende Methode, um Geschäftsprozesse oberflächenbasiert und ohne größere Systemeingriffe zu automatisieren und Medienbrüche abzubauen. Die Auswahl der passenden Prozesse ist dabei für den Erfolg von RPA-Projekten entscheidend. Der vorliegende Beitrag liefert dafür Selektionskriterien, die aus einer qualitativen Inhaltanalyse von elf Interviews mit RPA-Experten aus dem Versicherungsumfeld resultieren. Das Ergebnis umfasst eine gewichtetet Liste von sieben Dimensionen und 51 Prozesskriterien, welche die Automatisierung mit Softwarerobotern begünstigen bzw. deren Nichterfüllung eine Umsetzung erschweren oder sogar verhindern. Die drei wichtigsten Kriterien zur Auswahl von Geschäftsprozessen für die Automatisierung mittels RPA umfassen die Entlastung der an dem Prozess mitwirkenden Mitarbeiter (Arbeitnehmerüberlastung), die Ausführbarkeit des Prozesses mittels Regeln (Regelbasierte Prozessteuerung) sowie ein positiver Kosten-Nutzen-Vergleich. Praktiker können diese Kriterien verwenden, um eine systematische Auswahl von RPA-relevanten Prozessen vorzunehmen. Aus wissenschaftlicher Perspektive stellen die Ergebnisse eine Grundlage zur Erklärung des Erfolgs und Misserfolgs von RPA-Projekten dar.
KW  - Robotic Process Automation
KW  - RPA
KW  - Prozessautomatisierung
KW  - Prozessverbesserung
KW  - Selektionskriterien
Y1  - 2020
U6  - http://dx.doi.org/10.1365/s40702-020-00665-0
SN  - 1436-3011
N1  - Corresponding author: Mathias Eggert
VL  - 57
IS  - 6
SP  - 1150
EP  - 1162
PB  - Springer
CY  - Weinheim
ER  - 
TY  - PAT
A1  - Finger, Sebastian
A1  - Hojdis, Nils
A1  - Menglong, Huang
T1  - Sekundäre galvanische Zelle
N2  - Die vorliegende Erfindung betrifft eine sekundäre galvanische Zelle, umfassend eine Kathode, eine Anode und einen Separator, der zwischen der Kathode und der Anode angeordnet ist, wobei die Kathode ein erstes elastomeres Polymer umfasst, welches mit einem ersten Füllstoff als Kathodenmaterial gefüllt ist, wobei die Anode ein zweites elastomeres Polymer umfasst, welches mit einem zweiten Füllstoff als Anodenmaterial gefüllt ist, wobei der Separator ein drittes elastomeres Polymer umfasst, wobei das erste elastomere Polymer, das zweite elastomere Polymer und das dritte elastomere Polymer unabhängig voneinander aus vernetzungsfähigen Dienkautschuken ausgewählt sind, und wobei zumindest eines von dem ersten elastomeren Polymer, dem zweiten elastomeren Polymer und dem dritten elastomeren Polymer eine ionische Flüssigkeit und/oder ein elektrisch leitfähiges Polymer enthält. Die vorliegende Erfindung betrifft ferner eine wiederaufladbare Batterie, umfassend die erfindungsgemäße sekundäre galvanische Zelle, ein Verfahren zur Herstellung einer sekundären galvanischen Zelle sowie die Verwendung der erfindungsgemäßen sekundären galvanischen Zelle sowie der erfindungsgemäßen wiederaufladbaren Batterie.
Y1  - 2020
N1  - Patent DE102018222385A1 25.06.2020
auch veröffentlicht unter EP3671932A1
ER  - 
TY  - JOUR
A1  - Butenweg, Christoph
A1  - Rosin, Julia
T1  - Seismischer Nachweis von Mauerwerksbauten in deutschen Erdbebengebieten
JF  - Mauerwerk
N2  - Mit finanzieller Unterstützung der Deutschen Gesellschaft für Mauerwerks- und Wohnungsbau e.V. (DGfM) und des Deutschen Instituts für Bautechnik in Berlin (DIBt) wurden zwei aufeinander aufbauende Forschungsvorhaben zur Verbesserung der seismischen Nachweise von Mauerwerksbauten in deutschen Erdbebengebieten durchgeführt. Zunächst wurde das seismische Verhalten von drei modernen unbewehrten Mauerwerksgebäuden in der Region Emilia Romagna in Italien während der Erdbebenserie im Jahr 2012 in Kooperation mit der Universität Pavia eingehend untersucht. Aufbauend auf den Erkenntnissen dieser Untersuchungen wurde ein verbessertes seismisches Bemessungskonzept für unbewehrte Mauerwerksbauten erarbeitet. Der Beitrag stellt die wesentlichen Ergebnisse dieser Forschungsarbeiten und deren Eingang in die Normung vor.
Y1  - 2020
U6  - http://dx.doi.org/10.1002/dama.202000006
SN  - 1437-1022
VL  - 24
IS  - 2
SP  - 108
EP  - 113
PB  - Wiley
CY  - Weinheim
ER  - 
TY  - CHAP
A1  - Tomić, Igor
A1  - Penna, Andrea
A1  - DeJong, Matthew
A1  - Butenweg, Christoph
A1  - Correia, António A.
A1  - Candeias, Paulo X.
A1  - Senaldi, Ilaria
A1  - Guerrini, Gabriele
A1  - Malomo, Daniele
A1  - Beyer, Katrin
T1  - Seismic testing of adjacent interacting masonry structures
T2  - 12th International Conference on Structural Analysis of Historical Constructions (SAHC 2020)
N2  - In many historical centres in Europe, stone masonry buildings are part of building aggregates, which developed when the layout of the city or village was densified. In these aggregates, adjacent buildings share structural walls to support floors and roofs. Meanwhile, the masonry walls of the façades of adjacent buildings are often connected by dry joints since adjacent buildings were constructed at different times. Observations after for example the recent Central Italy earthquakes showed that the dry joints between the building units were often the first elements to be damaged. As a result, the joints opened up leading to pounding between the building units and a complicated interaction at floor and roof beam supports. The analysis of such building aggregates is very challenging and modelling guidelines do not exist. Advances in the development of analysis methods have been impeded by the lack of experimental data on the seismic response of such aggregates. The objective of the project AIMS (Seismic Testing of Adjacent Interacting Masonry Structures), included in the H2020 project SERA, is to provide such experimental data by testing an aggregate of two buildings under two horizontal components of dynamic
excitation. The test unit is built at half-scale, with a two-storey building and a one-storey building. The buildings share one common wall while the façade walls are connected by dry joints. The floors are at different heights leading to a complex dynamic response of this smallest possible building aggregate. The shake table test is conducted at the LNEC seismic testing facility. The testing sequence comprises four levels of shaking: 25%, 50%, 75% and 100% of nominal shaking table capacity. Extensive instrumentation, including accelerometers, displacement transducers and optical measurement systems, provides detailed information on the building aggregate response. Special attention is paid to the interface opening, the globa
KW  - Historical centres
KW  - Stone masonry
KW  - Adjacent buildings
KW  - Shake table test
Y1  - 2020
U6  - http://dx.doi.org/10.23967/sahc.2021.234
N1  - Wednesday, 16 September, 2020 to Friday, 18 September, 2020, Barcelona.
SP  - 1
EP  - 12
ER  - 
TY  - CHAP
A1  - Cacciatore, Pamela
A1  - Butenweg, Christoph
T1  - Seismic safety of cylindrical granular material steel silos under seismic loading
T2  - Seismic design of industrial facilities 2020: proceedings of the 2nd International Conference on Seismic Design of Industrial Facilities (SeDIF-Conference)
Y1  - 2020
SN  - 978-3-86359-729-0
SP  - 231
EP  - 244
ER  - 
TY  - BOOK
A1  - Butenweg, Christoph
A1  - Hoffmeister, Benno
A1  - Holtschoppen, Britta
A1  - Klinkel, Sven
A1  - Rosin, Julia
A1  - Schmitt, Timo
T1  - Seismic design of industrial facilities 2020: proceedings of the 2nd International Conference on Seismic Design of Industrial Facilities (SeDIF-Conference)
Y1  - 2020
SN  - 978-3-86359-729-0
PB  - Apprimus Verlag
CY  - Aachen
ER  - 
TY  - CHAP
A1  - Marinkovic, Marko
A1  - Butenweg, Christoph
T1  - Seismic behaviour of RC frames with uncoupled masonry infills having two storeys or two bays
T2  - 17th International Conference -From historical to sustainable masonry, Krakow, Poland, July 5-8, 2020
Y1  - 2020
U6  - http://dx.doi.org/10.1201/9781003098508-72
SP  - 1
EP  - 7
ER  - 
TY  - PAT
A1  - Hojdis, Nils
A1  - Recker, Carla
T1  - Schwefelvernetzte Kautschukmischung für Fahrzeugreifen enthaltend Carbon Nanotubes (cnt), Fahrzeugreifen, Der Die schwefelvernetzte Kautschukmischung aufweist, sowie Verfahren zur Herstellung der schwefelvernetzten Kautschukmischung enthaltend Cnt
Y1  - 2020
N1  - Patent EP000003625288A1 25.03.2020
auch veröffentlicht unter 
CN110678508A; DE102017208137A1; WO2018210471A1
ER  - 
TY  - CHAP
A1  - Laack, Walter van
T1  - Schnittstelle Tod:  Aufbruch oder Ende -  Kontakte oder Hirngespinste?
N2  - Tagungsbeiträge des 6. Europäischen Seminars am 09. November 2019 in Aachen zum Thema Nahtoderfahrungen mit dem Serientitel: "Schnittstelle Tod"
Y1  - 2020
SN  - 978-3-936624-51-9
PB  - van Laack GmbH
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Fiedler, Thomas M.
A1  - Ladd, Mark E.
A1  - Clemens, Markus
A1  - Bitz, Andreas
T1  - Safety of subjects during radiofrequency exposure in ultra-high-field magnetic resonance imaging
JF  - IEEE Letters on Electromagnetic Compatibility Practice and Applications
N2  - Magnetic resonance imaging (MRI) is one of the most important medical imaging techniques. Since the introduction of MRI in the mid-1980s, there has been a continuous trend toward higher static magnetic fields to obtain i.a. a higher signal-to-noise ratio. The step toward ultra-high-field (UHF) MRI at 7 Tesla and higher, however, creates several challenges regarding the homogeneity of the spin excitation RF transmit field and the RF exposure of the subject. In UHF MRI systems, the wavelength of the RF field is in the range of the diameter of the human body, which can result in inhomogeneous spin excitation and local SAR hotspots. To optimize the homogeneity in a region of interest, UHF MRI systems use parallel transmit systems with multiple transmit antennas and time-dependent modulation of the RF signal in the individual transmit channels. Furthermore, SAR increases with increasing field strength, while the SAR limits remain unchanged. Two different approaches to generate the RF transmit field in UHF systems using antenna arrays close and remote to the body are investigated in this letter. Achievable imaging performance is evaluated compared to typical clinical RF transmit systems at lower field strength. The evaluation has been performed under consideration of RF exposure based on local SAR and tissue temperature. Furthermore, results for thermal dose as an alternative RF exposure metric are presented.
Y1  - 2020
SN  - 2637-6423
U6  - http://dx.doi.org/10.1109/LEMCPA.2020.3029747
VL  - 2
IS  - 3
SP  - 1
EP  - 8
PB  - IEEE
CY  - New York, NY
ER  - 
TY  - JOUR
A1  - Finkenberger, Isabel Maria
A1  - Veil, Katja
T1  - Räumliche Transformation
JF  - RaumPlanung : Fachzeitschrift für räumliche Planung und Forschung
Y1  - 2020
SN  - 0176-7534
VL  - 205
IS  - 1
SP  - 6
EP  - 11
PB  - IfR (Informationskreis für Raumplanung)
CY  - Dortmund
ER  - 
TY  - JOUR
A1  - Gaigall, Daniel
T1  - Rothman–Woodroofe symmetry test statistic revisited
JF  - Computational Statistics & Data Analysis
N2  - The Rothman–Woodroofe symmetry test statistic is revisited on the basis of independent but not necessarily identically distributed random variables. The distribution-freeness if the underlying distributions are all symmetric and continuous is obtained. The results are applied for testing symmetry in a meta-analysis random effects model. The consistency of the procedure is discussed in this situation as well. A comparison with an alternative proposal from the literature is conducted via simulations. Real data are analyzed to demonstrate how the new approach works in practice.
Y1  - 2020
U6  - http://dx.doi.org/10.1016/j.csda.2019.106837
SN  - 0167-9473
VL  - 2020
IS  - 142
SP  - Artikel 106837
PB  - Elsevier
CY  - Amsterdam
ER  -