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Front Cover: A Unified Research Data Infrastructure for Catalysis Research – Challenges and Concepts (ChemCatChem 14/2021)

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ChemCatChem 2021年第14期13卷

作者： Christoph Wulf Prof. Matthias Beller Dr.-Ing. Thomas Boenisch Prof. Olaf Deutschmann Dr. Schirin Hanf Prof. Norbert Kockmann Dr.-Ing. Ralph Kraehnert Prof. Mehtap Oezaslan Dr. Stefan Palkovits Dr. Sonja Schimmler Dr. Stephan A. Schunk Prof. Kurt Wagemann Dr. David Linke Leibniz-Institute for Catalysis Rostock Albert-Einstein-Str. 29a D-18059 Rostock Germany High Performance Computing Center Stuttgart (HLRS) University of Stuttgart Nobelstr. 19 D-70569 Stuttgart Germany Karlsruher Institut für Technologie (KIT) Kaiserstraße 12 D-76131 Karlsruhe Germany Karlsruher Institut für Technologie (KIT) Engesserstr. 15 D-76131 Karlsruhe Germany Biochemical and Chemical Engineering Equipment Design TU Dortmund University D-44221 Dortmund Germany BasCat – UniCat BASF JointLab Technische Universität Berlin Hardenbergstraße 36 D-10623 Berlin Germany Institute of Technical Chemistry TU Braunschweig D-38106 Braunschweig Germany Institute for Technical and Macromolecular Chemistry RWTH Aachen University Worringerweg 2 D-52074 Aachen Germany Fraunhofer Institute for Open Communication Systems (FOKUS) Kaiserin-Augusta-Allee 31 D-10589 Berlin Germany the high throughput experimentation company Kurpfalzring 104 D-69123 Heidelberg Germany BASF SE Carl-Bosch Str. 38 D-67056 Ludwigshafen Germany DECHEMA e.V. Theodor-Heuss-Allee 25 D-60486 Frankfurt Germany

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An online-learning approach to inverse optimization

arXiv

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arXiv 2018年

作者： Bärmann, Andreas Martin, Alexander Pokutta, Sebastian Schneider, Oskar Lehrstuhl für Wirtschaftsmathematik Department Mathematik Friedrich-Alexander-Universität Erlangen-Nürnberg Cauerstraße 11 Erlangen91058 Germany Laboratory for Interactive Optimization and Learning School of Industrial & Systems Engineering Georgia Institute of Technology Ferst Drive 755 NW AtlantaGA United States Gruppe Data Science and Optimization Fraunhofer Arbeitsgruppe für Supply-Chain Services SCS Fraunhofer Institut für Integrierte Schaltungen IIS Nordostpark 93 Nürnberg90411 Germany

In this paper, we demonstrate how to learn the objective function of a decision-maker while only observing the problem input data and the decision-maker's corresponding decisions over multiple rounds. Our approach is based on online learning and works for linear objectives over arbitrary feasible sets for which we have a linear optimization oracle. As such, it generalizes previous approaches based on KKT-system decomposition and dualization. The two exact algorithms we present - based on multiplicative weights updates and online gradient descent respectively - converge at a rate of O(1/√T) and thus allow taking decisions which are essentially as good as those of the observed decision-maker already after relatively few observations. We also discuss several useful generalizations, such as the approximate learning of non-linear objective functions and the case of suboptimal observations. Finally, we show the effectiveness and possible applications of our methods in a broad computational study.68Q32, 68T05, 90C90, 90C11 Copyright © 2018, The Authors. All rights reserved.

关键词： Gradient methods

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Publisher Correction: Perovskites fabricated on textured silicon surfaces for tandem solar cells

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Communications chemistry 2020年第1期3卷 65页

作者： Sang-Won Lee Soohyun Bae Jae-Keun Hwang Wonkyu Lee Solhee Lee Ji Yeon Hyun Kyungjin Cho Seongtak Kim Friedemann D Heinz Sung Bin Choi Dongjin Choi Dongkyun Kang Jeewoong Yang Sujeong Jeong Se Jin Park Martin C Schubert Stefan Glunz Won Mok Kim Yoonmook Kang Hae-Seok Lee Donghwan Kim Department of Materials Science and Engineering Korea University Seoul 136-713 Republic of Korea. Gangwon Regional Division Korea Institute of Industrial Technology Gangwon-Do 210-340 Republic of Korea. Laboratory for Photovoltaic Energy Conversion Department of Sustainable Systems Engineering (INATECH) University Freiburg Emmy-Noether Strasse 2 79110 Freiburg Germany. Korea Institute of Science and Technology (KIST) Seoul 02792 Republic of Korea. Fraunhofer Institute for Solar Energy Systems ISE Freiburg 79110 Germany. Laboratory for Photovoltaic Energy Conversion University Freiburg Freiburg 79110 Germany. KU·KIST Green School Graduate School of Energy and Environment Korea University Seoul 136-713 Republic of Korea. KU·KIST Green School Graduate School of Energy and Environment Korea University Seoul 136-713 Republic of Korea. lhseok@korea.ac.kr. Department of Materials Science and Engineering Korea University Seoul 136-713 Republic of Korea. solar@korea.ac.kr. KU·KIST Green School Graduate School of Energy and Environment Korea University Seoul 136-713 Republic of Korea. solar@korea.ac.kr.

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A Model for the Development of Sustainable Innovations for the Early Phase of the Innovation Process

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Procedia Manufacturing 2017年 8卷 215-222页

作者： Stock, Tim Obenaus, Michael Slaymaker, Amara Seliger, Günther Institute for Assembly Technology and Factory Management Technische Universität Berlin Pascalstraße 8-9 Berlin Germany Fraunhofer Institute for Production Systems and Design Technology IPK Pascalstraße 8-9 10587 Berlin Berlin Germany Department of Chemical Engineering McGill University 3610 University Street Montreal H3A 0C5 Quebec Canada

Current industrial development is faced by the global challenge to meet the continuously growing demand for capital and consumer goods in emerging countries while simultaneously ensuring a sustainable industrial growth in the social, environmental and economic dimension. By means of market dynamics of cooperation and competition in global value creation and knowledge networks, innovations geared towards sustainability can be essential drivers for realizing a sustainable development. The targeted development of new sustainable innovations is consequently a key activity in order to move towards sustainable industrial growth. This paper will describe a model for the development of sustainable innovations. The model focuses on idea generation in the early phase of the innovations process, addressing the fuzzy front end of innovation. In this context, specific goals and principles of sustainable development are integrated into a problem-solving approach. This integrated approach is subsequently used as a foundation for the targeted development of sustainable innovations in the frame of a workshop concept. © 2017 The Authors

关键词： Innovation management Model Sustainable development

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Motion planning with motion primitives for industrial bin picking

Motion planning with motion primitives for industrial bin pi...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： Vojtech Vonasek Axel Vick Martin Saska Faculty of Electrical Engineering Czech Technical University in Prague Czech Republic Automation Technology Division Fraunhofer Institute for Production Systems and Design Technology Berlin Germany

In the bin picking problem, the task is to automatically unload objects from a container using a robotic manipulator. The task is often approached by organizing the objects into a predictable pattern, e.g., a workpiece carrier, in order to simplify all integral subtasks like object recognition, motion planning and grasping. In such a case, motion planning can even be solved offline as it is ensured that the objects are always at the same positions at known times. However, there is a growing demand for non-structured bin picking, where the objects can be placed randomly in the bins. This arises from recent trends of transforming classical factories into smart production facilities allowing small lot sizes at the efficiency of mass production. The demand for fast and highly flexible handling and manipulation abilities of industrial robots requires to solve all the bin picking methods, including motion planning, online. In this paper, we propose a novel technique for fast sampling-based motion planning of robotic manipulators using motion primitives. Motion primitives are short trajectories that boost search of the configuration space and consequently speed up the planning phase. The proposed work has been verified in a simulation and on a prototype of a bin picking system.

关键词： Planning Manipulators Trajectory Service robots Three-dimensional displays

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Enhancement of temporal contrast by filtered SPM broadened spectra

Enhancement of temporal contrast by filtered SPM broadened s...

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Advanced Solid State Lasers, ASSL 2017

作者： Buldt, Joachim Mueller, Michael Klas, Robert Eidam, Tino Limpert, Jens Tünnermann, Andreas Institute of Applied Physics Abbe Center of Photonics Friedrich-Schiller-University Jena Albert-Einstein-Str. 6 Jena07745 Germany Helmholtz-Institute Jena Fröbelstieg 3 Jena07743 Germany Active Fiber Systems GmbH Wildenbruchstr. 15 Jena07745 Germany Fraunhofer Institute for Applied Optics and Precision Engineering Albert-Einstein-Str. 7 Jena07745 Germany

A novel technique based on SPM and spectral filters to enhance the temporal contrast of laser-pulses by several orders of magnitude with high efficiency and peak-power conservation is demonstrated. © OSA 2017.

ISBN: (纸本)9780960038077

关键词： Femtosecond lasers High power lasers Hollow core fibers Self phase modulation Ultrafast lasers Wave plates

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Oxidative Fluorination of Cu/ZnO Methanol Catalysts

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Angewandte Chemie 2019年第37期131卷

作者： Valentin Dybbert Samuel Matthias Fehr Florian Klein Achim Schaadt Anke Hoffmann Elias Frei Emre Erdem Thilo Ludwig Harald Hillebrecht Ingo Krossing Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) Universität Freiburg Albertstrasse 21 79104 Freiburg Germany Fraunhofer Institute for Solar Energy Systems Heidenhofstrasse 2 79110 Freiburg Germany Fritz-Haber Institute of the Max-Planck Society Faraday-Weg 4–6 14195 Berlin Germany Faculty of Engineering and Natural Sciences Sabanci University 34956 Istanbul Turkey

The influence of a mild difluorine treatment on Cu/ZnO precatalysts for methanol synthesis was investigated. It led to the incorporation of 1.2…1.3±0.1 wt % fluoride into the material. Fluorination considerably increased the amount of ZnO x related defect sites on the catalysts and significantly increased the space‐time yields. Although the apparent activation energy E A,app for methanol formation from CO 2 and H 2 was almost unchanged, the E A,app for the reverse water‐gas shift (rWGS) reaction increased considerably. Overall, fluorination led to a significant gain in methanol selectivity and productivity. Apparently, also the quantity of active sites increased.

关键词： Anionische Modifikationen Fluorierungen Heterogene Katalyse Kohlendioxid Methanol

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On event detection from spatial time series for urban traffic applications

On event detection from spatial time series for urban traffi...

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European Conference on Machine Learning, ECML 1989

作者： Souto, Gustavo Liebig, Thomas Fraunhofer Institute for Software and Systems Engineering Fraunhofer ISST Dortmund Germany Artificial Intelligence Group TU Dortmund University Dortmund Germany

ISBN: (纸本)9783319417059

Since the last decades the availability and granularity of location-based data has been rapidly growing. Besides the proliferation of smartphones and location-based social networks, also crowdsourcing and voluntary geographic data led to highly granular mobility data, maps and street networks. In result, location-aware, smart environments are created. The trend for personal self-optimization and monitoring named by the term ‘quantified self’ will speed-up this ongoing process. The citizens in conjunction with their surrounding smart infrastructure turn into ‘living sensors’ that monitor all aspects of urban living (traffic load, noise, energy consumption, safety and many others). The "Big Data"- based intelligent environments and smart cities require algorithms that process these massive amounts of spatio-temporal data. This article provides a survey on event processing in spatio-temporal data streams with a special focus on urban traffic. © Springer International Publishing Switzerland 2016.

关键词： Energy utilization

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A 220–260 GHz medium power variable gain amplifier MMIC with low phase variation

A 220–260 GHz medium power variable gain amplifier MMIC wit...

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Asia-Pacific Conference on Microwave

作者： D. Müller M. Fink C. V. Vangerow A. Tessmann A. Leuther T. Zwick I. Kallfass Institute of Radio Frequency Engineering and Electronics Karlsruhe Institute of Technology Karlsruhe Germany Fraunhofer Institute for Applied Solid State Physics Freiburg Germany Institute of Robust Power Semiconductor Systems University of Stuttgart Stuttgart Germany

A variable gain amplifier (VGA) operating in the WR3 frequency range (220 to 325GHz) with low phase variation is presented. The VGA is carried out as balanced amplifier with a three-stage cascode amplifier in each path. The small-signal gain is 24.2dB with a 3 dB bandwidth of 43GHz ranging from 218.8 to 261.8 GHz. Within a gain control range of 17dB the phase variation is below -5° and +10°. The large signal behavior shows a maximum output power P sat of 7.4dBm at 240 GHz with a saturated gain of 12dB. The MMIC was fabricated in a 50 nm InGaAs technology and has a chip size of 1.25 × 0.75mm 2 .

关键词： Gain Bandwidth Power generation Couplers Transistors Logic gates Frequency measurement

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A 200 - 300 GHz 1:2 Active Power Divider MMIC

A 200 - 300 GHz 1:2 Active Power Divider MMIC

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International Conference on Infrared, Millimeter, and Terahertz Waves

作者： D. Muller M. Fink J. Eisenbeis H. Massler A. Tessmann A. Leuther T. Zwick I. Kallfass Institute of Radio Frequency Engineering and Electronics Karlsruhe Institute of Technology Karlsruhe Germany Fraunhofer Institute for Applied Solid State Physics Freiburg Germany Institute of Robust Power Semiconductor Systems University of Stuttgart Stuttgart Germany

This paper presents an active 1:2 power divider built in a 35 nm InGaAs monolithic microwave integrated circuit (MMIC) technology. The circuit is based on a common-source transistor with an interstage matching at the drain connection to feed two parallel common-gate transistors. The measured gain is 3.6 dB with a 3dB bandwidth of 100 GHz ranging from 200 to 300 GHz. Input and output return loss are better than 8.5 dB and 4.1 dB, respectively. The core area of the active power divider is only 300 × 290 μm~2.

关键词： Power dividers Transistors Frequency measurement Power measurement Transmission line measurements Gain Gain measurement

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