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排序方式: 共有273条查询结果,搜索用时 0 毫秒
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Linoleic acid hydroperoxide formed by soybean lipoxygenase was metabolized by the same enzyme in the presence of guaiacol. The products of this reaction included trihydroxyoctadecenoic acids, hydroperoxydihydroxyoctadecenoic acids, hydroxyepoxyoctadecenoic acids, dihydroxyoctadecenoic acids, hydroxyoctadecadienoic acids, and oxooctadecadienoic acids. 相似文献
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Prof. Dr.-Ing. Hans-Jürgen Jacobs Dr.-Ing. Steffen Gluch Dipl.-Ing. Uwe Knobloch Dipl.-Ing. Jens Hoyer 《Forschung im Ingenieurwesen》1994,60(7-8):187-192
Zusammenfassung Entwickelt wurde eine Funktionserweiterung für CNC-Steuerungen an Drehmaschinen, die eine dynamische Schnittwertplanung und-steuerung
nach technischen und organisatorischen Kriterien gestattet. Für diesen Optimierregler werden die aus einem entsprechenden
mathematischen Modell abgeleiteten Algorithmen und seine Verbindung zur NC-Programmierung angegeben. Mittels weiterer Modelle
wird auch eine integrierte Standzeitplanung und-steuerung bei wechselnden Schnittbedingungen dargestellt. Mit solchen Proze?regelkreisen
für Schnittwerte und Werkzeugstandzeiten k?nnen erstamalig auch fertigungsorganisatorische Plandaten durch die CNC-Steuerung
verarbeitet werden. Gleichzeitig werden in Untersetzung der Werkstattsteuerung St?rungskompensationen „vor Ort” m?glich. 相似文献
37.
The inverse scattering problem for perfectly conducting convex bodies has been solved in the multistatic case. By eliminating depolarisation effects from the far-field data a function Ac(up, ?) can be determined that well approximates the cross-sectional area function of the body. So the reconstruction problem is reduced to a Radon problem. 相似文献
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The influence on the mass transfer in liquid-liquid extraction was investigated during droplet formation in a quiescent aqueous continuous phase for the two transition components, acetone and acetonitrile, in toluene. Both transition components have similar characteristics. However, an approximately eight times slower mass transfer of a droplet hanging on a capillary in relation to a rising droplet could be observed. The droplet formation time and the initial solute concentration are decisive for the mass transfer behaviour. A lower volumetric flow leads to slower droplet formation and a higher specific mass transfer area enhancing mass transfer, which is visualized via laser induced fluorescence (LIF). Additionally, as expected, higher initial solute concentrations promote Marangoni turbulences and thus mass transfer, which is measured via confocal Raman spectroscopy inside a fixed hanging droplet. 相似文献
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Yazhi Liu Shuofeng Liang Chenrui Yuan Andreas Best Michael Kappl Kaloian Koynov Hans-Jürgen Butt Si Wu 《Advanced functional materials》2021,31(37):2103908
Anticounterfeiting materials are used to distinguish real banknotes, products, and documents from counterfeits, fakes, or unauthorized replicas. However, conventional anticounterfeiting materials generally exhibit a single anticounterfeiting function, resulting in a low level of security. Herein, a novel anticounterfeiting nanocomposite is demonstrated with numerous prominent security features. The nanocomposite is fabricated by doping upconverting nanoparticles (UCNPs) in a photoresponsive azobenzene-containing polymer (azopolymer). Because of the cis–trans photoisomerization of the azopolymer, the nanocomposite exhibits photoinduced reversible color changes suitable for anticounterfeiting applications. Additionally, the hard nanocomposite can be converted to a rubber-like soft solid by light irradiation. Imprinted microstructures are fabricated on the photosoftened nanocomposite, which result in photonic colors. Moreover, polarization-dependent structures are fabricated on the nanocomposite via photoinduced orientation for encryption. Importantly, UCNPs in the nanocomposite emit visible light upon excitation by near-infrared light, enabling the observation of various anticounterfeiting structures with high contrast. An advantage of the anticounterfeiting nanocomposite is that the security features can be observed by the naked eye for quick discrimination and can be analyzed using laboratory equipment for higher accuracy. The anticounterfeiting nanocomposite is easily processed on paper, glass, and plastic, which demonstrates its potential anticounterfeiting functions for banknotes, wines, and medicines. 相似文献
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Power generation from renewable energy sources and fossil fuels are integrated into one system. A combination of technologies in the form of a carbon capture utilization (CCU)-combined power station is proposed. The technology is based on energy generation from fossil fuels by a coal power plant with CO2 recovery from exhaust gases, and pyrolysis of natural gas to hydrogen and carbon, completed by reverse water-gas shift for the conversion of CO2 to CO, which will react with hydrogen in a Fischer-Tropsch synthesis for synthetic diesel. The carbon from the pyrolysis can replace other fossil carbon or can be sequestered. This technology offers significant CO2 savings compared to the current state of technology and makes an environmentally friendly use of fossil fuels for electricity and fuel sectors possible. 相似文献