@article{63733,
  abstract     = {{<jats:p>We study a possibility of measuring the time-resolved second-order autocorrelation function of one of two beams generated in type-II parametric down-conversion by means of temporal magnification of this beam, bringing its correlation time from the picosecond to the nanosecond scale, which can be resolved by modern photodetectors. We show that such a measurement enables one to infer directly the degree of global coherence of that beam, which is linked by a simple relation to the number of modes characterizing the entanglement between the two generated beams. We illustrate the proposed method by an example of photon pairs generated in a periodically poled potassium titanyl phosphate (KTP) crystal with a symmetric group velocity matching for various durations of the pump pulse, resulting in different numbers of modes. Our theoretical model also shows that the magnified double-heralded autocorrelation function of one beam exhibits a local maximum around zero delay time, corresponding to photon bunching at a short time scale.</jats:p>}},
  author       = {{Horoshko, Dmitri B. and Srivastava, Shivang and Sośnicki, Filip Maksymilian and Mikołajczyk, Michał and Karpiński, Michał and Brecht, Benjamin and Kolobov, Mikhail I.}},
  issn         = {{2469-9926}},
  journal      = {{Physical Review A}},
  number       = {{2}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Time-resolved second-order autocorrelation function of parametric down-conversion}}},
  doi          = {{10.1103/7ckm-tm3r}},
  volume       = {{112}},
  year         = {{2025}},
}

@techreport{62981,
  abstract     = {{Otus is a high-performance computing cluster that was launched in 2025 and is operated by the Paderborn Center for Parallel Computing (PC2) at Paderborn University in Germany. The system is part of the National High Performance Computing (NHR) initiative. Otus complements the previous supercomputer Noctua 2, offering approximately twice the computing power while retaining the three node types that were characteristic of Noctua 2: 1) CPU compute nodes with different memory capacities, 2) high-end GPU nodes, and 3) HPC-grade FPGA nodes. On the Top500 list, which ranks the 500 most powerful supercomputers in the world, Otus is in position 164 with the CPU partition and in position 255 with the GPU partition (June 2025). On the Green500 list, ranking the 500 most energy-efficient supercomputers in the world, Otus is in position 5 with the GPU partition (June 2025).


This article provides a comprehensive overview of the system in terms of its hardware, software, system integration, and its overall integration into the data center building to ensure energy-efficient operation. The article aims to provide unique insights for scientists using the system and for other centers operating HPC clusters. The article will be continuously updated to reflect the latest system setup and measurements. }},
  author       = {{Ehtesabi, Sadaf and Hossain, Manoar and Kenter, Tobias and Krawinkel, Andreas and Ostermann, Lukas and Plessl, Christian and Riebler, Heinrich and Rohde, Stefan and Schade, Robert and Schwarz, Michael and Simon, Jens and Winnwa, Nils and Wiens, Alex and Wu, Xin}},
  keywords     = {{Otus, Supercomputer, FPGA, PC2, Paderborn Center for Parallel Computing, Noctua 2, HPC}},
  pages        = {{33}},
  publisher    = {{Paderborn Center for Parallel Computing (PC2)}},
  title        = {{{Otus Supercomputer}}},
  doi          = {{10.48550/ARXIV.2512.07401}},
  volume       = {{1}},
  year         = {{2025}},
}

@inproceedings{65205,
  author       = {{Moritzer, Elmar and Lingnau, Kai Martin}},
  booktitle    = {{The 40th International Conference of Polymer Processing Society}},
  title        = {{{Transfer of powder-based direct coating in the injection molding process from two dimensional components to three-dimensional components}}},
  year         = {{2025}},
}

@inproceedings{65211,
  author       = {{Held, Christian and Moritzer, Elmar}},
  booktitle    = {{FA11 – Kunststoff-Fügen}},
  title        = {{{Werkstofflicher Ansatz zum adhäsiv-basierten Fügen für hochflexible TPE-Organobleche als Verstärkungsstruktur}}},
  year         = {{2025}},
}

@inproceedings{65203,
  author       = {{Held, Christian and Moritzer, Elmar}},
  booktitle    = {{the 40th International Conference of Polymer Processing Society}},
  title        = {{{Influence of the processing parameters on the mechanical strenght of injection moulded BMC components for direct screwing}}},
  year         = {{2025}},
}

@inproceedings{65208,
  author       = {{Rempel, Timm and Brüning, Florian}},
  booktitle    = {{ANTEC}},
  title        = {{{Investigations into the specific throughput stability of conical feed zones over the rotation speed during the direct processing of polypropylene regrind}}},
  year         = {{2025}},
}

@inproceedings{65209,
  author       = {{Held, Christian and Moritzer, Elmar}},
  booktitle    = {{FA11 – Kunststoff-Fügen}},
  title        = {{{Werkstoffgerechte Auslegung von Direktverschraubungen in SMC/BMC Bauteilen}}},
  year         = {{2025}},
}

@inproceedings{65210,
  author       = {{Held, Christian and Moritzer, Elmar}},
  booktitle    = {{FA11 – Kunststoff-Fügen}},
  title        = {{{Werkstoffgerechte Auslegung von Direktverschraubungen in SMC/BMC Bauteilen}}},
  year         = {{2025}},
}

@article{63662,
  abstract     = {{<jats:p>The accurate prediction of crack initiation and propagation is essential for assessing the structural integrity of mechanically joined components and other complex assemblies. To overcome the limitations of existing finite element tools, a modular Python framework has been developed to automate three-dimensional crack growth simulations. The program combines geometric reconstruction, adaptive remeshing, and the numerical evaluation of fracture mechanics parameters within a single, fully automated workflow. The framework builds on open-source components and remains solver-independent, enabling straightforward integration with commercial or research finite element codes. A dedicated sequence of modules performs all required steps, from mesh separation and crack insertion to local submodeling, stress and displacement mapping, and iterative crack-front update, without manual interaction. The methodology was verified using a mini-compact tension (Mini-CT) specimen as a benchmark case. The numerical results demonstrate the accurate reproduction of stress intensity factors and energy release rates while achieving high computational efficiency through localized refinement. The developed approach provides a robust basis for crack growth simulations of geometrically complex or residual stress-affected structures. Its high degree of automation and flexibility makes it particularly suited for analyzing cracks in clinched and riveted joints, supporting the predictive design and durability assessment of joined lightweight structures.</jats:p>}},
  author       = {{Krome, Sven and Duffe, Tobias and Kullmer, Gunter and Schramm, Britta and Ostwald, Richard}},
  issn         = {{2076-3417}},
  journal      = {{Applied Sciences}},
  number       = {{1}},
  publisher    = {{MDPI AG}},
  title        = {{{Validation and Verification of Novel Three-Dimensional Crack Growth Simulation Software GmshCrack3D}}},
  doi          = {{10.3390/app16010384}},
  volume       = {{16}},
  year         = {{2025}},
}

@article{65004,
  author       = {{Knaup, Felix and Brüning, Florian}},
  journal      = {{Extrusion}},
  keywords     = {{Aufschmelzen, extrusion, Messtechnik}},
  pages        = {{28–33}},
  title        = {{{Vergleich experimenteller Methoden zur Untersuchung des Aufschmelzprozesses in Einschneckenextrudern}}},
  year         = {{2025}},
}

@inproceedings{65213,
  author       = {{Petzke, Jonas Dirk Rudolf Helmut and Schöppner, Volker}},
  title        = {{{Thermo-Chemical Devulcanization of Sulfur-Cured Styrene-Butadiene Rubber (SBR) Using Diphenyldisulfide (DPDS)}}},
  year         = {{2025}},
}

@inproceedings{65204,
  author       = {{Moritzer, Elmar and Salm, Maximilian Karl Franz}},
  booktitle    = {{The 40th International Conference of Polymer Processing Society}},
  title        = {{{Influence of Filler Type and Volume Fraction on the Electrical Conductivity and Shore Hardness of TPU Composites in Fused Filament Fabrication}}},
  year         = {{2025}},
}

@inproceedings{63441,
  author       = {{Moritzer, Elmar and Brandes, Philipp and Wittler, Maurice and Claes, Leander and Wippermann, Mareen and Henning, Bernd}},
  booktitle    = {{40th International Conference of the Polymer Processing Society}},
  keywords     = {{Faser-Kunststoff-Verbunde (FKV), Faserverstärkte Kunststoffe (FVK), Organobleche, Ultraschall}},
  title        = {{{Non-destructive fiber-matrix adhesion measurement of glass fiber reinforced thermoplastic composite laminates using ultrasound}}},
  year         = {{2025}},
}

@inbook{65240,
  author       = {{Petzke, Jonas Dirk Rudolf Helmut and Schmidt, Leon and Kleinschmidt, Dennis and Brüning, Florian}},
  booktitle    = {{International Rubber Conference (IRC) 2025, Bangkok, BITEC; e-abstract book}},
  keywords     = {{distributives Mischen, Extrusion, Kautschuk, Stiftextruder}},
  pages        = {{150–151}},
  title        = {{{Experimental Analysis of the Mixing Behavior of Ethylene-Propylene-Diene Rubber (EPDM) in a Rubber Pin Extruder under Variation of Process Parameters and Mixing Elements}}},
  year         = {{2025}},
}

@inbook{65238,
  author       = {{Damanik, Hogenrich and Fatima, Arooj and Turek, Stefan and Petzke, Jonas Dirk Rudolf Helmut and Kleinschmidt, Dennis and Brüning, Florian}},
  booktitle    = {{International Rubber Conference (IRC) 2025, Bangkok, BITEC; e-abstract book}},
  keywords     = {{CFD simulation, Materialmodellierung, Phan-Thien-Tanner, PTT, Simulation}},
  pages        = {{266–268}},
  title        = {{{Numerical modeling of the non-isothermal viscoelastic flow behavior of rubber compounds based on the PHAN-THİEN-TANNER (PTT) model}}},
  year         = {{2025}},
}

@inbook{65239,
  author       = {{Petzke, Jonas Dirk Rudolf Helmut and Kleinschmidt, Dennis and Brüning, Florian}},
  booktitle    = {{International Rubber Conference (IRC) 2025, Bangkok, BITEC; e-abstract book}},
  keywords     = {{Devulkanisation, Kautschuk, Recycling}},
  pages        = {{185–186}},
  title        = {{{Thermo-Chemical Devulcanization of Sulfur-cured Styrene-Butadiene Rubber (SBR) Using Diphenyldisulfide (DPDS)}}},
  year         = {{2025}},
}

@article{65241,
  author       = {{Rempel, Timm and Brüning, Florian}},
  journal      = {{ANTEC}},
  title        = {{{Investigations into the specific throughput stability of conical feed zones over the rotation speed during the direct processing of polypropylene regrind}}},
  year         = {{2025}},
}

@inproceedings{65245,
  author       = {{Petzke, Jonas Dirk Rudolf Helmut}},
  title        = {{{Devulcanization behavior of SBR-based GTR compounds}}},
  year         = {{2025}},
}

@inproceedings{59896,
  abstract     = {{We present an electronic-photonic co-designed Mach-Zehnder modulator with linear segment drivers in a photonic SOI-CMOS technology with an EO 3-dB bandwidth of ≥ 27 GHz and data transmission up to 64 Gbit/s without pre-emphasis.}},
  author       = {{Kress, Christian and Schwabe, Tobias and Mihaylov, Martin Miroslavov and Scheytt, J. Christoph}},
  location     = {{Long Beach, CA, USA}},
  title        = {{{High-Speed Mach-Zehnder Modulator with Linear Segmented On-Chip Drivers in Photonic 45nm SOI-CMOS Technology }}},
  year         = {{2025}},
}

@phdthesis{50530,
  abstract     = {{Die Extrusion stellt das mengenmäßig dominante Verarbeitungsverfahren für thermoplastische Kunststoffe dar. Daher gibt es starke Bestrebungen in diesem Bereich hin zu einer höheren Wirtschaftlichkeit, welche beispielsweise durch höheren Massedurchsatz bei gleichbleibender Maschinengröße erreicht werden kann, oder aber auch im Hinblick auf eine Kreislaufwirtschaft die Bestrebung hin zu einer materialschonenden Verarbeitung. Beide Bestrebungen erfordern spezielle Schneckenkonzepte. Hierunter fallenWave- Schnecken, welche in beiden Bereichen ein vorteilhaftes Prozessverhalten aufzeigen sollen. Die Auslegung von Wave-Schnecken erfordert jedoch ein stärkeres Verständnis über das geometrieabhängige Prozessverhalten in der Extrusion. 
Im Rahmen der Dissertation werden zwei Themengebiete angegangen. Das erste Thema ist die Herleitung einer Methode zur Charakterisierung des Abbauverhaltens von Thermoplasten sowie die Nutzung der Charakterisierung als Vorhersagemodell. Das zweite Thema behandelt die Auslegung von Wave-Schnecken basierend auf numerischen Simulationen samt Validierung anhand von sieben Energy-Transfer-Schnecken im Vergleich zu drei konventionellen Schnecken. Hierbei werden unter anderem der Materialabbau, die thermische und die stoffliche Homogenität betrachtet, um ein umfassendes Bild über das Prozessverhalten der Schnecken zu schaffen. Die vorgestellten Untersuchungen dienen schlussendlich zu einer Bestätigung des vorteilhaften Prozessverhaltens von Wave-Schnecken.}},
  author       = {{Schall, Christoph Wilhelm Theodor}},
  isbn         = {{978-3-8440-9334-6}},
  pages        = {{224}},
  publisher    = {{Shaker Verlag}},
  title        = {{{Materialschonende Verarbeitung von Thermoplasten auf Wave-Schnecken}}},
  volume       = {{Band 2/2024}},
  year         = {{2024}},
}