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961.
To successfully implement circular economy processes into present value chains, economic feasibility of disassembly processes is essential. Current developments in science and technology, such as artificial intelligence and Internet of Things, foster steep progression in the field of robotics. In this review, the current research on robotics in disassembly is investigated by a systematic literature review. The results were clustered in a framework system distinguishing between applied and basic research on the two main streams of disassembly automation research, namely, predefined processes and adaptable, flexible automation. 相似文献
962.
Thomas Töppel Holger Lausch Michael Brand Eric Hensel Michael Arnold Christian Rotsch 《JOM Journal of the Minerals, Metals and Materials Society》2018,70(3):321-327
Laser beam melting (LBM), an additive laser powder bed fusion technology, enables the structural integration of temperature-sensitive sensors and actuators in complex monolithic metallic structures. The objective is to embed a functional component inside a metal part without losing its functionality by overheating. The first part of this paper addresses the development of a new process chain for bonded embedding of temperature-sensitive sensor/actuator systems by LBM. These systems are modularly built and coated by a multi-material/multi-layer thermal protection system of ceramic and metallic compounds. The characteristic of low global heat input in LBM is utilized for the functional embedding. In the second part, the specific functional design and optimization for tailored smart components with embedded functionalities are addressed. Numerical and experimental validated results are demonstrated on a smart femoral hip stem. 相似文献
963.
Dr. Mathew Sutherland Alice Li Anissa Kaghad Dimitrios Panagopoulos Dr. Fengling Li Dr. Magdalena Szewczyk Dr. David Smil Dr. Cora Scholten Dr. Léa Bouché Dr. Timo Stellfeld Dr. Cheryl H. Arrowsmith Dr. Dalia Barsyte Dr. Masoud Vedadi Dr. Ingo V. Hartung Dr. Holger Steuber Dr. Robert Britton Dr. Vijayaratnam Santhakumar 《ChemMedChem》2021,16(7):1116-1125
Protein arginine N-methyl transferase 4 (PRMT4) asymmetrically dimethylates the arginine residues of histone H3 and nonhistone proteins. The overexpression of PRMT4 in several cancers has stimulated interest in the discovery of inhibitors as biological tools and, potentially, therapeutics. Although several PRMT4 inhibitors have been reported, most display poor selectivity against other members of the PRMT family of methyl transferases. Herein, we report the structure-based design of a new class of alanine-containing 3-arylindoles as potent and selective PRMT4 inhibitors, and describe key structure–activity relationships for this class of compounds. 相似文献
964.
Hagemann Annika Knorr Moritz Janssen Holger Stiller Christoph 《International Journal of Computer Vision》2022,130(1):17-32
International Journal of Computer Vision - Accurate camera calibration is a precondition for many computer vision applications. Calibration errors, such as wrong model assumptions or imprecise... 相似文献
965.
Journal of Logic, Language and Information - This paper expounds a simple and non-trivial Ramsey Test. Drawing on the work of Peter Gärdenfors, it aims to help establish an epistemic... 相似文献
966.
Dr. Marco Lelle Maik Otte Michele Bonus Prof. Dr. Holger Gohlke Prof. Dr. Klaus Benndorf 《Chembiochem : a European journal of chemical biology》2020,21(16):2311-2320
High-affinity fluorescent derivatives of cyclic adenosine and guanosine monophosphate are powerful tools for investigating their natural targets. Cyclic nucleotide-regulated ion channels belong to these targets and are vital for many signal transduction processes, such as vision and olfaction. The relation of ligand binding to activation gating is still challenging, and there is a need for fluorescent probes that enable the process to be broken down to the single-molecule level. This inspired us to prepare fluorophore-labeled cyclic nucleotides, which are composed of a bright dye and a nucleotide derivative with a thiophenol motif at position 8 that has already been shown to enable superior binding affinity. These bioconjugates were prepared by a novel cross-linking strategy that involves substitution of the nucleobase with a modified thiophenolate in good yield. Both fluorescent nucleotides are potent activators of different cyclic nucleotide-regulated ion channels with respect to the natural ligand and previously reported substances. Molecular docking of the probes excluding the fluorophore reveals that the high potency can be attributed to additional hydrophobic and cation-π interactions between the ligand and the protein. Moreover, the introduced substances have the potential to investigate related target proteins, such as cAMP- and cGMP-dependent protein kinases, exchange proteins directly activated by cAMP or phosphodiesterases. 相似文献
967.
Precipitation of nanoparticles is applied in various fields with a rising interest in the formulation of poorly soluble drugs. The impact of fluid mixing on the precipitation of organic nanoparticles is analyzed. Direct numerical simulations are applied to determine the spatiotemporal evolution of the liquid phase composition and to estimate the particle evolution along Langragian trajectories. The simulation results are compared with laboratory experiments of mixing and particle size evolution, which use a recently developed approach to rapidly stabilize the precipitated nanoparticles. The impact of mixing on precipitation is revealed, thereby enabling a parameter‐free estimation of the mean particle sizes and the particle size distributions. The distributions of residence time, supersaturation time, and particle size are self‐similar for Reynolds numbers in the turbulent regime and allow the derivation of scale‐up rules. 相似文献
968.
Jan Folke Huiqing Song Julian Schittkowski Robert Schlögl Holger Ruland 《化学,工程师,技术》2020,92(10):1567-1573
The influence of oxygen poisoning on a state-of-the-art multipromoted iron-based industrial catalyst for ammonia synthesis as well as the effectivity of different gas purification methods to prevent oxygen poisoning for experiments on laboratory scale were studied in detail. Additionally, the observed results were compared to a common oxygen poisoning test from literature, which on the one hand confirmed its usability in a wide range of conditions, but on the other hand also demonstrated the limitations of this test. 相似文献
969.
The Carbon2Chem® project aims to convert exhaust gases from the steel industry into chemicals such as methanol to reduce CO2 emissions. Here, H2 is required for the conversion of CO2 into methanol. Although much effort is put to produce H2 from renewables, the use of fossil fuels, especially natural gas, seems to be fundamental in the short term. For this reason, the development of clean technologies for the processing of natural gas with a low environmental impact has become a topic of utmost importance. In this context, methane pyrolysis has received special attention to produce CO2-free H2. 相似文献