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  • 1
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 50, No. 9 ( 2019-09), p. 2500-2506
    Kurzfassung: Endovascular treatment for large vessel occlusion in ischemic stroke has proven to be effective in large clinical trials. We aimed to provide real-world estimates of endovascular treatment reperfusion rates and functional outcome on a countrywide scale. Methods— Two thousand seven hundred ninety-four patients with large vessel occlusion were included into an investigator-initiated, industry-independent, prospective registry in 25 sites in Germany between June 2015 and April 2018. The primary outcome was the score on the modified Rankin Scale ranging from zero (no symptoms) to 6 (death) at 3 months. Secondary analyses included the prediction of a good outcome (modified Rankin Scale, 0–2). Dichotomized analyses of predictors were performed using logistic regression adjusted for potential confounders. Results— Median age was 75 years (interquartile range, 64–82); median National Institutes of Health Stroke Scale score was 15 (interquartile range, 10–19). Vessel occlusion was in the anterior circulation in 2265 patients (88%) and in the posterior circulation in 303 patients (12%). Intravenous alteplase before endovascular treatment was given in 1457 patients (56%). Successful reperfusion was achieved in 2143 subjects (83%). At 3 months, 854 patients (37%) showed a good outcome; mortality was 29%. There was no difference between anterior and posterior circulation occlusions ( P =0.27). Significant predictors for a good outcome were younger age (odds ratio [OR], 1.06; 95% CI, 1.05–1.07), no interhospital transfer (OR, 1.39; 95% CI, 1.03–1.88), lower stroke severity (OR, 1.10; 95% CI, 1.08–1.13), smaller infarct size (OR, 1.26; 95% CI, 1.15–1.39), alteplase use (OR, 1.49; 95% CI, 1.08–2.06), and reperfusion success (OR, 1.69; 95% CI, 1.45–1.96). Conclusions— High rates of favorable outcome can be achieved on a countrywide scale by endovascular treatment. Mortality appears to be greater in the daily routine than otherwise reported by authors of large randomized trials. There were no outcome differences between the anterior and posterior circulation. Clinical Trial Registration— URL: https://www.clinicaltrials.gov . Unique identifier: NCT03356392.
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2019
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
    In: Stroke, Ovid Technologies (Wolters Kluwer Health), Vol. 52, No. 5 ( 2021-05), p. 1580-1588
    Kurzfassung: Endovascular therapy is the standard of care in the treatment of acute ischemic stroke due to large-vessel occlusion. A direct association between the number of device passes and the occurrence of symptomatic intracranial hemorrhage (SICH) has been suggested. This study represents an in-depth investigation of the hypothesis that 〉 3 retrieval attempts is associated with an increased rate of SICH in a large multicenter patient cohort. Methods: Two thousand six hundred eleven patients from the prospective German Stroke Registry were analyzed. Patients who received Endovascular therapy for acute large-vessel occlusion of the anterior circulation with known admission National Institutes of Health Stroke Scale and Alberta Stroke Program Early CT Score, final Thrombolysis in Cerebral Infarction, and number of retrieval passes were included. The primary outcome was defined as SICH. The secondary outcome was any type of radiologically confirmed intracranial hemorrhage within the first 24 hours. Multivariate mixed-effects models were used to adjust for cluster effects of the participating centers, as well as for confounders. Results: Five hundred ninety-three patients fulfilled the inclusion criteria. The median number of retrieval passes was 2 [interquartile range, 1–3]. SICH occurred in 26 cases (4.4%), whereas intracranial hemorrhage was identified by neuroimaging in 85 (14.3%) cases. More than 3 retrieval passes was the strongest predictor for SICH (odds ratio, 3.61 [95% CI, 1.38–9.42] , P =0.0089) following adjustment for age, admission National Institutes of Health Stroke Scale, admission Alberta Stroke Program Early CT Score, and Thrombolysis in Cerebral Infarction, as well as time from symptom onset to flow restoration. Baseline Alberta Stroke Program Early CT Score of 8 to 9 (odds ratio, 0.26 [95% CI, 0.07–0.89], P =0.032) or 10 (odds ratio, 0.21 [95% CI, 0.06–0.78], P =0.020) were significant protective factors against the occurrence of SICH. Conclusions: More than 3 retrieval attempts is associated with a significant increase in SICH risk, regardless of patient age, baseline National Institutes of Health Stroke Scale, or procedure time. This should be considered when deciding whether to continue a procedure, especially in patients with large baseline infarctions. Registration: URL: https://www.clinicaltrials.gov ; Unique identifier: NCT03356392.
    Materialart: Online-Ressource
    ISSN: 0039-2499 , 1524-4628
    RVK:
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2021
    ZDB Id: 1467823-8
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 3
    Online-Ressource
    Online-Ressource
    World Scientific Pub Co Pte Ltd ; 2008
    In:  Journal of Advanced Manufacturing Systems Vol. 07, No. 01 ( 2008-06), p. 175-182
    In: Journal of Advanced Manufacturing Systems, World Scientific Pub Co Pte Ltd, Vol. 07, No. 01 ( 2008-06), p. 175-182
    Kurzfassung: The demand for economic processes concerning manufacturing technology, cycle time and material properties has led to the development of near net-shape techniques. Precision forging is a well-known manufacturing technology to achieve high output rates. An approach of optimization concerning the part material to produce load-adapted material properties is the so-called compound-forging. Therefore, two different alloys are forge-welded together. Non-tempering and tempering steels are used to compound-forge gears with a hard and wear-resistant surface layer as well as a ductile bulk material. Compound-forging was developed to forge spur gears and shall now be introduced to manufacture helical gears and shafts. For the production of gears and shafts billets made from non-tempering steels are forge-welded together with billets consisting of tempering steels by precision forging as well as indirect impact extrusion. In this paper, the comparison of the material properties of compound-forged gear wheels and shafts with a hard and wear resistant surface layer and a ductile bulk material is given. Mechanical properties as well as the micro-structure of the parts were investigated. The results of the investigations show a load-adapted material distribution of forge-welded materials for the production of gears and shafts.
    Materialart: Online-Ressource
    ISSN: 0219-6867 , 1793-6896
    Sprache: Englisch
    Verlag: World Scientific Pub Co Pte Ltd
    Publikationsdatum: 2008
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 4
    Online-Ressource
    Online-Ressource
    American Meteorological Society ; 2019
    In:  Journal of Climate Vol. 32, No. 6 ( 2019-03-15), p. 1677-1691
    In: Journal of Climate, American Meteorological Society, Vol. 32, No. 6 ( 2019-03-15), p. 1677-1691
    Kurzfassung: The future Stokes drift climate is investigated using a global wave climate projection (2071–2100) forced with EC-EARTH winds under the RCP8.5 scenario. The future climate run is compared against a historical run (1976–2005). The Stokes drift climate is analyzed in terms of Stokes transport and surface Stokes drift. The impact on Stokes drift from changes to the wind, wind sea, and swell climate is identified. The consequences for upper-ocean mixing and circulation are studied by investigating the turbulent Langmuir number and the Stokes depth. The historical climate run is also compared to a hindcast with ERA-Interim forcing. Systematic discrepancies due to differences in resolution and model physics are identified, but no fundamental weaknesses are uncovered that should adversely affect the future run. As the surface Stokes drift is largely dictated by high-frequency waves, it is to a great degree controlled by changes to the local wind field, whereas the Stokes transport is more sensitive to swell. Both are expected to increase in the Southern Ocean by about 15%, while the North Atlantic sees a decrease of about 10%. The Stokes depth and the turbulent Langmuir number are set to change by about ±20% and ±10%, respectively. The changes to the Stokes depth suggest a deeper impact of the Coriolis–Stokes force in the Southern Ocean and a decrease in the northern extratropics. Changes to the KPP Langmuir-enhancement factor suggests potentially increased mixing in the Southern Ocean and a reduction in the North Atlantic and the North Pacific.
    Materialart: Online-Ressource
    ISSN: 0894-8755 , 1520-0442
    RVK:
    Sprache: Unbekannt
    Verlag: American Meteorological Society
    Publikationsdatum: 2019
    ZDB Id: 246750-1
    ZDB Id: 2021723-7
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 5
    Online-Ressource
    Online-Ressource
    Springer Science and Business Media LLC ; 1935
    In:  Deutsche Zeitschrift für die Gesamte Gerichtliche Medizin Vol. 24, No. S5 ( 1935-9), p. 329-356
    In: Deutsche Zeitschrift für die Gesamte Gerichtliche Medizin, Springer Science and Business Media LLC, Vol. 24, No. S5 ( 1935-9), p. 329-356
    Materialart: Online-Ressource
    ISSN: 0937-9827 , 1437-1596
    Sprache: Deutsch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 1935
    ZDB Id: 1459222-8
    SSG: 2
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 6
    Online-Ressource
    Online-Ressource
    Springer Science and Business Media LLC ; 1966
    In:  Zeitschrift für angewandte Mathematik und Physik ZAMP Vol. 17, No. 1 ( 1966-1), p. 62-68
    In: Zeitschrift für angewandte Mathematik und Physik ZAMP, Springer Science and Business Media LLC, Vol. 17, No. 1 ( 1966-1), p. 62-68
    Materialart: Online-Ressource
    ISSN: 0044-2275 , 1420-9039
    RVK:
    Sprache: Deutsch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 1966
    ZDB Id: 1464001-6
    ZDB Id: 203013-5
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 7
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2013
    In:  Zeitschrift für wirtschaftlichen Fabrikbetrieb Vol. 108, No. 4 ( 2013-04-28), p. 224-228
    In: Zeitschrift für wirtschaftlichen Fabrikbetrieb, Walter de Gruyter GmbH, Vol. 108, No. 4 ( 2013-04-28), p. 224-228
    Kurzfassung: Zur nachhaltigen, ökologischen Auslegung von Prozessketten zur Herstellung von Schmiedebauteilen werden in diesem Beitrag verschiedene, simulationsbasierte Ansätze vorgestellt. Diese fokussieren zum einen die ökologische Optimierung des Schmiedeprozesses durch Verringerung der Reibung und durch Verbesserung des Materialflusses. Zum anderen wird eine multikriterielle Bewertung und Gestaltung (Ökologie, Zeit, Kosten) der gesamten Prozesskette durch Berücksichtigung der Wechselwirkungen zwischen den Bearbeitungsschritten präsentiert.
    Materialart: Online-Ressource
    ISSN: 2511-0896 , 0947-0085
    RVK:
    RVK:
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2013
    ZDB Id: 2133068-2
    ZDB Id: 1225290-6
    SSG: 3,2
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 8
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2007
    In:  Zeitschrift für wirtschaftlichen Fabrikbetrieb Vol. 102, No. 7-8 ( 2007-08-18), p. 437-441
    In: Zeitschrift für wirtschaftlichen Fabrikbetrieb, Walter de Gruyter GmbH, Vol. 102, No. 7-8 ( 2007-08-18), p. 437-441
    Kurzfassung: Für die Qualität umformtechnisch hergestellter Werkstücke ist der Weg-Zeit-Verlauf des Stößels der Presse von wesentlichem Einfluss. Der Einsatz unrunder Zahnräder im Antrieb mechanischer Pressen ist eine Möglichkeit, das Spektrum der realisierbaren Bewegungsabläufe bei gleichbleibender Taktzeit deutlich zu erweitern. Eine Bewegungsrast des Stößels bei konstanter Drehzahl des Antriebsmotors wird jedoch erst durch Kombination einer Stirnradstufe mit unrunden Zahnrädern mit einem Planetenumlaufgetriebe möglich. Hierdurch eröffnen sich Optimierungspotenziale für die Fertigung in hohen Stückzahlen.
    Materialart: Online-Ressource
    ISSN: 2511-0896 , 0947-0085
    RVK:
    RVK:
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2007
    ZDB Id: 2133068-2
    ZDB Id: 1225290-6
    SSG: 3,2
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 9
    Online-Ressource
    Online-Ressource
    MDPI AG ; 2023
    In:  Journal of Manufacturing and Materials Processing Vol. 7, No. 4 ( 2023-07-13), p. 130-
    In: Journal of Manufacturing and Materials Processing, MDPI AG, Vol. 7, No. 4 ( 2023-07-13), p. 130-
    Kurzfassung: The Collaborative Research Center 1153 is investigating a novel process chain for manufacturing high-performance hybrid components. The combination of aluminum and steel can reduce the weight of components and lead to lower fuel consumption. During the welding of aluminum and steel, a brittle intermetallic phase is formed that reduces the service life of the component. After welding, the workpiece is heated inhomogeneously and hot-formed in a cross-wedge rolling process. Since the intermetallic phase grows depending on the temperature during hot forming, temperature control is of great importance. In this paper, the possibility of process-integrated contact temperature measurement with thin-film sensors is investigated. For this purpose, the initial temperature distribution after induction heating of the workpiece is determined. Subsequently, cross-wedge rolling is carried out, and the data of the thin-film sensors are compared to the temperature measurements after heating. It is shown that thin-film sensors inserted into the tool are capable of measuring surface temperatures even at a contact time of 0.041 s. The new process monitoring of the temperature makes it possible to develop a better understanding of the process as well as to further optimize the temperature distribution. In the long term, knowledge of the temperatures in the different materials also makes it possible to derive quality characteristics as well as insights into the causes of possible process errors (e.g., fracture of the joining zone).
    Materialart: Online-Ressource
    ISSN: 2504-4494
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2023
    ZDB Id: 2911715-X
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 10
    Online-Ressource
    Online-Ressource
    Walter de Gruyter GmbH ; 2015
    In:  Zeitschrift für wirtschaftlichen Fabrikbetrieb Vol. 110, No. 1-2 ( 2015-02-24), p. 18-22
    In: Zeitschrift für wirtschaftlichen Fabrikbetrieb, Walter de Gruyter GmbH, Vol. 110, No. 1-2 ( 2015-02-24), p. 18-22
    Kurzfassung: Beim Scherschneiden entstehen Schwingungen, welche auf die schlagartige Entspannung der vorgespannten Pressenstruktur zum Zeitpunkt der Materialtrennung zurückzuführen sind. Die entstehenden Stößelschwingungen führen zu einer Erhöhung des Reibweges zwischen dem Schneidstempel und dem Blechwerkstoff, was einen erhöhten Werkzeugverschleiß verursacht. In diesem Beitrag werden zwei Methoden zur Reduzierung der Stößelschwingungen erforscht. Ziel ist es, die Stößelschwingungen zu reduzieren und in Folge dessen den Verschleiß an Schneidstempeln zu minimieren.
    Materialart: Online-Ressource
    ISSN: 2511-0896 , 0947-0085
    RVK:
    RVK:
    Sprache: Englisch
    Verlag: Walter de Gruyter GmbH
    Publikationsdatum: 2015
    ZDB Id: 2133068-2
    ZDB Id: 1225290-6
    SSG: 3,2
    Standort Signatur Einschränkungen Verfügbarkeit
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