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... Gen. G. J. Farmar, Mr. Ned Russell, Mr. Markus Feldmann, Cardinal Mooney, Mr. Adam Carse Historian Of Music ...
1958 - Gale Group | TDA
Markus Feldmann, Mascha Pilsl, Katharina Langosch,
... Structural Glazing-Fassade unter Erfüllung besonderer technischer Anforderungen Markus Feldmann Prof. Dr.-Ing., Markus Feldmann Prof. Dr.-Ing. Lehrstuhl für Stahlbau und Leichtmetallbau, ... 52074 AachenSearch for more papers by this author Markus Feldmann Prof. Dr.-Ing., Markus Feldmann Prof. Dr.-Ing. Lehrstuhl für Stahlbau und Leichtmetallbau, ...
Tópico(s): Ecology, Conservation, and Geographical Studies
2008 - Wiley | Stahlbau
Shangpu Liu, Mikaël Képénékian, Stanislav Bodnar, Sascha Feldmann, Markus W. Heindl, Natalie Fehn, Jonathan Zerhoch, Andrii Shcherbakov, Alexander Pöthig, Yang Li, Ulrich W. Paetzold, Aras Kartouzian, Ian D. Sharp, Claudine Katan, Jacky Even, Felix Deschler,
Hybrid perovskite semiconductor materials are predicted to lock chirality into place and encode asymmetry into their electronic states, while softness of their crystal lattice accommodates lattice strain to maintain high crystal quality with low defect densities, necessary for high luminescence yields. We report photoluminescence quantum efficiencies as high as 39% and degrees of circularly polarized photoluminescence of up to 52%, at room temperature, in the chiral layered hybrid lead-halide perovskites ( ...
Tópico(s): 2D Materials and Applications
2023 - American Association for the Advancement of Science | Science Advances
A. Haugeneder, M. Neges, C. Kallinger, W. Spirkl, Uli Lemmer, Jochen Feldmann, Markus Amann, Ullrich Scherf,
The emission dynamics in photoexcited planar conjugated polymer waveguides is investigated at high excitation densities. Using femtosecond pump/probe experiments and photoluminescence spectroscopy we investigate the interplay of nonlinear radiative and nonradiative recombination processes. Amplified spontaneous emission (ASE) leads to an ultrafast depletion of the excited state at excitation densities above 1018 cm−3 in an ladder-type poly(p-phenylene) film deposited on a glass substrate. Owing to ...
Tópico(s): Photochemistry and Electron Transfer Studies
1999 - American Institute of Physics | Journal of Applied Physics
Andrea Muolo, Alberto Baiardi, Robin Feldmann, Markus Reiher,
We introduce the Nuclear-Electronic All-Particle Density Matrix Renormalization Group (NEAP-DMRG) method for solving the time-independent Schrödinger equation simultaneously for electrons and other quantum species. In contrast to the already existing multicomponent approaches, in this work, we construct from the outset a multi-reference trial wave function with stochastically optimized non-orthogonal Gaussian orbitals. By iterative refining of the Gaussians’ positions and widths, we obtain a compact ...
Tópico(s): Quantum, superfluid, helium dynamics
2020 - American Institute of Physics | The Journal of Chemical Physics
José M. López, Daniel Feldmann, Markus Rampp, Alberto Vela-Martín, Liang Shi, Marc Avila,
We present nsCouette, a highly scalable software tool to solve the Navier-Stokes equations for incompressible fluid flow between differentially heated and independently rotating, concentric cylinders. It is based on a pseudospectral spatial discretization and dynamic time-stepping. It is implemented in modern Fortran with a hybrid MPI-OpenMP parallelization scheme and thus designed to compute turbulent flows at high Reynolds and Rayleigh numbers. An additional GPU implementation (C-CUDA) for intermediate ...
Tópico(s): Fluid Dynamics and Vibration Analysis
2020 - Elsevier BV | SoftwareX
Anna Yordanova, Anja Becker, Elisabeth Eppard, Stefan Kürpig, C. Fisang, Georg Feldmann, Markus Essler, Hojjat Ahmadzadehfar,
Tópico(s): Medical Imaging Techniques and Applications
2017 - Springer Science+Business Media | European Journal of Nuclear Medicine and Molecular Imaging
Justin Ferdinandus, Elisabeth Eppard, Florian Gaertner, Stefan Kürpig, Rolf Fimmers, Anna Yordanova, Stefan Hauser, Georg Feldmann, Markus Essler, Hojjat Ahmadzadehfar,
Radioligand therapy (RLT) with 177Lu-PSMA-617 (PSMA is prostate-specific membrane antigen) is a novel targeted therapy for metastatic prostate cancer. In this study, we evaluated the effect of different pretherapeutic parameters on the therapeutic response measured by prostate-specific antigen (PSA) 2 mo after RLT.RLT was performed in 40 hormone-refractory patients with distant metastases and progressive disease (mean age, 71.4 y). 68Ga-PSMA-11 PET/CT was performed in all patients 1-2 wk before RLT. ...
Tópico(s): Prostate Cancer Diagnosis and Treatment
2016 - Society of Nuclear Medicine and Molecular Imaging | Journal of Nuclear Medicine
Heinz Feldmann, Markus Czub, Steven J.M. Jones, Daryl Dick, Michael Garbutt, Allen Grolla, Harvey Artsob,
In human history, numerous infectious diseases have emerged and re-emerged. Aside from many others, the so-called 'exotic' agents in particular are a threat to our public health systems due to limited experience in case management and lack of appropriate resources. Many of these agents are zoonotic in origin and transmitted from animals to man either directly or via vectors. The reservoirs are often infected subclinically or asymptomatically and the distribution of the diseases basically reflects ...
Tópico(s): Viral Infections and Outbreaks Research
2002 - Springer Science+Business Media | Medical Microbiology and Immunology
... Autonomous Mobile Building Robots with Flexible Manipulators Klaus Feldmann, Markus Koch Pages 1-6 (2000 Proceedings of the ...
Tópico(s): Advanced Manufacturing and Logistics Optimization
2000 - | Proceedings of the ... ISARC
Susanne Lütje, Georg Feldmann, Markus Essler, Peter Brossart, Ralph A. Bundschuh,
Immune checkpoint blockade represents a promising approach in oncology, showing antitumor activities in various cancers. However, although being generally far better tolerated than classic cytotoxic chemotherapy, this treatment, too, may be accompanied by considerable side effects and not all patients benefit equally. Therefore, careful patient selection and monitoring of the treatment response is mandatory. At present, checkpoint-specific molecular imaging is being increasingly investigated as ...
Tópico(s): Immunotherapy and Immune Responses
2020 - Society of Nuclear Medicine and Molecular Imaging | Journal of Nuclear Medicine
Markus Feldmann, Maximilian Laurs, Jan Belis, Nebojša Buljan, A. Criaud, E. Dupont, Martina Eliášová, Laura Galuppi, Paavo Hassinen, Ruth Kasper, Christian Louter, Giampiero Manara, Anne Minne, Tim Morgan, Gabriele Pisano, Mauro Overend, Gianni Royer‐Carfagni, Jens Schneider, Gregor Schwind, Christian Schüler, Geralt Siebert, Anna Sikynova,
Abstract Since the beginning of 2021, CEN/TS 19100 Design of Glass Structures has been available in its first three parts. The fourth part is expected soon. This Technical Specification of the European standards organisation CEN is as a pre-standard of a corresponding future Eurocode. These documents constitute the first ever comprehensive design code for the entire structural glass engineering field on the European market for the first time. In addition to a clear outline, the Technical Specification ...
Tópico(s): Building materials and conservation
2023 - Springer Science+Business Media | Glass Structures & Engineering
Helen Bartsch, Sandro Citarelli, Markus Feldmann,
The paper addresses current implementations and potentials for the future in the field of fatigue assessment using local stress concepts. The background of the effective notch stress concept and its numerical application are described in detail. Common codes and regulations containing local stress approaches have been analysed and compared. A useful approach to apply the notch stress concept not only for welded, but also for unwelded steel components and machined or ground welded joints is presented. ...
Tópico(s): Advanced Welding Techniques Analysis
2022 - Elsevier BV | Journal of Constructional Steel Research
Helen Bartsch, Markus Feldmann,
The assumption of the detail categories in EN1993-1-9 is the presence of a certain weld quality level. In order to find out the sensitivity of the resulting fatigue strength for cases where a worse or better quality level compared to the selected level of EN ISO 5817 is achieved, in this paper, special fatigue experiments are presented. The experiments refer to the load-carrying cruciform joint with lack of penetration and root fusion as well as undercuts. The performed fatigue investigations on ...
Tópico(s): Structural Load-Bearing Analysis
2022 - Elsevier BV | International Journal of Fatigue
Helen Bartsch, Markus Feldmann,
The paper deals with the reassessment of fatigue detail categories of bolts and rods in EC 3-1-9 based on published fatigue test data and further conducted investigations. An elaborate database structure has been set up to evaluate the available fatigue test data in a differentiated way. Detail categories of bolts and rods in tension and shear have been investigated and re-evaluated based on the developed data base. Moreover, fatigue tests and numerical investigations on prestressed bolts in T-joints, ...
Tópico(s): Structural Engineering and Materials Analysis
2021 - Elsevier BV | Journal of Constructional Steel Research
Helen Bartsch, Markus Feldmann,
The present paper deals with the reassessment of fatigue detail categories of plain members and mechanically fastened joints (Table 8.1 in EC3-1-9) based on published fatigue test data. For a differentiated re-evaluation of details an elaborate database structure has been set up. Detail categories of different types of plain members and mechanically fastened joints have been investigated and revised by evaluating the collected fatigue data. Finally, several influences on the fatigue strength of the ...
Tópico(s): Engineering and Materials Science Studies
2021 - Elsevier BV | Journal of Constructional Steel Research
Helen Bartsch, Markus Feldmann,
The paper deals with investigations on the fatigue resistance of the load-carrying cruciform joint with gaps. The aim is to define limits of specific acceptable imperfections, since these do not always necessarily affect the fatigue strength. Different geometrical influences on the fatigue strength of the load-carrying cruciform joint with gaps are analysed numerically. Numerical simulations comprise effective notch stress calculations, which have been compared to fatigue test results from literature, ...
Tópico(s): Fatigue and fracture mechanics
2021 - Elsevier BV | Journal of Constructional Steel Research
Helen Bartsch, Felix Eyben, Gesa Pauli, Simon Schaffrath, Markus Feldmann,
This work deals with experimental and numerical investigations on the rotation capacity of high-strength steel (HSS) I-girders. The investigation involved 20 three-point bending tests conducted on mainly homogeneous and hybrid high-strength steel girders. The experimental tests have successfully been recalculated numerically considering damage mechanics approaches to model ductile crack initiation. The test of the high-strength steel beams showed that they are able to withstand large rotations with ...
Tópico(s): Fire effects on concrete materials
2021 - American Society of Civil Engineers | Journal of Structural Engineering
Björn Abeln, Achim Geßler, Elisabeth Stammen, Florian Ilg, Markus Feldmann, Klaus Dilger, Christian Schüler,
Steel bridges with orthotropic decks are a common construction method for long-span bridges. The type of construction was developed in the 1960s, and the early structures in particular show increasing crack damage. The reasons for this are, on the one hand, design deficiencies and, on the other hand, massively increased traffic loads. Therefore, there is a need for rehabilitation methods that neither weaken the cross-section, like bolted solutions, nor introduce thermal stresses, like welds, but ...
Tópico(s): Structural Load-Bearing Analysis
2021 - Taylor & Francis | The Journal of Adhesion
Helen Bartsch, Ronny Kühne, Sandro Citarelli, Simon Schaffrath, Markus Feldmann,
First investigations have been carried out on the characterisation of the as-welded surface roughness of unmilled wire arc additive manufactured (WAAM) components, followed by an experimental determination of the fatigue strength. Subsequently, randomly based finite-element (FE) simulations are carried out to expand the findings. The statistical characteristics of the surface provide the input values for the Monte-Carlo (MC) simulation. Here, the fatigue strengths of single-wire and multiple-wire welded ...
Tópico(s): Additive Manufacturing and 3D Printing Technologies
2021 - Elsevier BV | Structures
Helen Bartsch, Sandro Citarelli, Markus Feldmann,
The paper deals with investigations on the fatigue resistance of welded-in stiffeners with gaps. The presented investigations aim to specify limits of acceptable imperfections in terms of gaps in welds, as these do not reduce the fatigue strength in all cases. Finite-element simulations applying the effective notch stress concept have been conducted and confronted with fatigue test results from a detailed fatigue test database. Several geometrical influences regarding the fatigue behaviour of welded- ...
Tópico(s): Mechanical Failure Analysis and Simulation
2021 - Elsevier BV | Journal of Constructional Steel Research
Helen Bartsch, Benno Hoffmeister, Markus Feldmann,
End plate connections with prestressed bolts represent economical joints in steel construction. However, the fatigue resistance of these connections is currently insufficiently covered in Eurocode 3-1-9 [1]. The weld and bolt stresses during fatigue loading of end plate connections have been examined in detail. To this end, fatigue tests have been carried out on component and small-scale specimens. In a subsequent numerical investigation, FE-models have been validated by the experimental results. ...
Tópico(s): Mechanical stress and fatigue analysis
2020 - Elsevier BV | International Journal of Fatigue
Helen Bartsch, Karl Drebenstedt, Benjamin Seyfried, Markus Feldmann, Ulrike Kuhlmann, Thomas Ummenhofer,
Abstract This paper addresses the assessment of fatigue details according to EN 1993‐1‐9, which form the basis of the most important fatigue verification, the nominal stress approach. First of all, a suitable statistical methodology had to be defined for consistent detail classification. A structured database on the MySQL platform serves as a basis for the evaluation of the detail categories. In addition to fatigue test data documented in the background document to EN 1993‐1‐9, this database also ...
Tópico(s): Probabilistic and Robust Engineering Design
2020 - Wiley | Steel Construction
Markus Feldmann, Ronny Kühne, Sandro Citarelli, Uwe Reisgen, Rahul Sharma, Lukas Oster,
Abstract Der 3D‐Druck metallischer Bauteile im Pulverbettverfahren findet bisher überwiegend in der Luft‐ und Raumfahrt oder im Maschinenbau Anwendung. Für die Fertigung von strukturellen Großbauteilen, wie sie im Stahlbau zum Einsatz kommen, sind die Laser‐Pulver‐basierten additiven Fertigungsverfahren derzeit zu teuer, um einen wirtschaftlichen Einsatz in Aussicht zu stellen. Hier kann das Wire Arc Additive Manufacturing (WAAM) eine Möglichkeit bieten, den 3D‐Druck von großen Stahlkomponenten zu ...
Tópico(s): Titanium Alloys Microstructure and Properties
2019 - Wiley | Stahlbau
Helen Bartsch, Benno Hoffmeister, Markus Feldmann,
In many areas of our infrastructure, as for instance the construction of crane runway beams, fatigue design of steel structures is a major issue. An important detail in practice, but insufficiently classified in the (Eurocode 3-1-9, 2005) detail catalogue, is the end plate connection with prestressed bolts. Detailed numerical simulations are often necessary for the fatigue check of the weld at the T-stub. The knowledge of the true bolt force required in the detail catalogue can usually also only ...
Tópico(s): Engineering Structural Analysis Methods
2019 - Elsevier BV | Procedia Structural Integrity
Markus Feldmann, Helen Bartsch, Ulrike Kuhlmann, Karl Drebenstedt, Thomas Ummenhofer, Benjamin Seyfried,
Abstract Der Beitrag befasst sich mit der Neuauswertung des Kerbfallkatalogs nach EC3‐1‐9. Zur konsistenten Kerbfallklassifizierung wurde zunächst eine geeignete statistische Methodik festgelegt. Als Grundlage für die Kerbfallauswertung dient eine strukturierte SQL‐gestützte Datenbank, die neben neueren und eigenen Versuchsdaten zunächst vor allem jene Ermüdungsversuchsdaten umfasst, die im Hintergrunddokument zum EC3‐1‐9 dokumentiert sind. Nach Selektion der aussagekräftigsten Versuchsdaten wurden ...
Tópico(s): Reliability and Maintenance Optimization
2019 - Wiley | Stahlbau
Ronny Kühne, Markus Feldmann, Sandro Citarelli, Uwe Reisgen, Rahul Sharma, Lukas Oster,
ABSTRACT The classic 3D printing of metallic components using powder bed processes has so far mainly been used in the aerospace industry or in mechanical engineering. For the production of large structural components, such as those used in steel construction, laser powder‐based additive manufacturing processes are too expensive. Wire and Arc Additive Manufacturing (WAAM) can offer a possibility to realize 3D printing of large steel components. This process, also known as “shape welding”, has become ...
Tópico(s): Innovations in Concrete and Construction Materials
2019 - Wiley | ce/papers
Robert Fontecha, Frank Kemper, Markus Feldmann,
The development of wind turbine technology has led to higher and larger wind turbines with a higher sensitivity to dynamic effects. One of these effects is the aerodynamic damping, which introduces favorable damping forces in oscillating wind turbines. These forces play an important role in the turbine lifetime, but have not yet been studied systematically in detail. Consequently, this paper studies the plausibility of determining the aerodynamic damping of wind turbines systematically through wind ...
Tópico(s): Fluid Dynamics and Vibration Analysis
2019 - Multidisciplinary Digital Publishing Institute | Energies
Maik Kopp, Kevin Wolters, Martin Claßen, Josef Hegger, М. Gündel, Joerg Gallwoszus, Sabine Heinemeyer, Markus Feldmann,
Composite dowels are known as powerful shear connectors in steel-concrete-composite girders. More and more they are used in practice, especially for prefabricated composite bridges. Compared to headed studs they provide an increased strength. They also show a good deformation capacity even in high strength concrete. Furthermore, the application in steel sections without upper flange is very simple. Nevertheless, missing standards for composite dowels with the economic clothoidal and puzzle shape ...
Tópico(s): Structural Behavior of Reinforced Concrete
2018 - Elsevier BV | Journal of Constructional Steel Research
Nicole Schillo, Markus Feldmann,
While there are precise analytical model available to assess the calculation of critical and ultimate load for global and local buckling separately, the interaction of both modes prove to be difficult as membrane effects and imperfections are of major impact. In an experimental programme, thirteen tests on columns with high b/t-ratio were carried out on square welded box sections made of S500 and S960 steel material, varying the global slenderness. The experiments were re-calculated with the Finite- ...
Tópico(s): Composite Structure Analysis and Optimization
2017 - Elsevier BV | Thin-Walled Structures