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- 저자 : ppers, Felix (검색결과 5 건)
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Zhang, Hehe,Yoo, Sijung,Menzel, Stephan,Funck, Carsten,Cü,ppers, Felix,Wouters, Dirk J.,Hwang, Cheol Seong,Waser, Rainer,Hoffmann-Eifert, Susanne American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.35
<P>Redox-type resistive random access memories based on transition-metal oxides are studied as adjustable two-terminal devices for integrated network applications beyond von Neumann computing. The prevailing, so-called, counter-eight-wise (c8w) polarity of the switching hysteresis in filamentary-type valence change mechanism devices originates from a temperature- and field-controlled drift-diffusion process of mobile ions, predominantly oxygen vacancies in the switching oxide. Recently, a bipolar resistive switching (BRS) process with opposite polarity, so-called, eight-wise (8w) switching, has been reported that, especially for TiO<SUB>2</SUB> cells, is still not completely understood. Here, we report on nanosized (<0.01 μm<SUP>2</SUP>) asymmetric memristive cells from 3 to 6 nm thick TiO<SUB>2</SUB> films by atomic layer deposition, which reveal a coexistence of c8w and 8w switching in the same cell. As important characteristics for the studied Pt/TiO<SUB>2</SUB>/Ti/Pt devices, the resistance states of both modes are nonvolatile and share one common state; i.e., the high-resistance state of the c8w mode equals the low-resistance state of the 8w-mode. A transition between the opposite hysteresis loops is possible by voltage control. Specifically, 8w BRS in the TiO<SUB>2</SUB> cells is a self-limited low-energy nonvolatile switching process. Additionally, the 8w reset process enables the programming of multilevel high-resistance states. Combining the experimental results with data from simulation studies allows to propose a model, which explains 8w BRS by an oxygen transfer process across the Pt/TiO<SUB>2</SUB> Schottky interface at the position of the c8w filament. Therefore, the coexistence of c8w and 8w BRS in the nanoscale asymmetric Pt/TiO<SUB>2</SUB>/Ti/Pt cells is understood from a competition between drift/diffusion of oxygen vacancies in the oxide layer and an oxygen exchange reaction across the Pt/TiO<SUB>2</SUB> interface.</P> [FIG OMISSION]</BR>
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On the switching dynamics of epitaxial ferroelectric CeO2–HfO2 thin film capacitors
Cüppers Felix,Hirai Koji,Funakubo Hiroshi 나노기술연구협의회 2022 Nano Convergence Vol.9 No.56
Epitaxial layers of ferroelectric orthorhombic HfO2 are frequently investigated as model systems for industrially more relevant polycrystalline films. The recent success in stabilizing the orthorhombic phase in the solid-solution cerium oxide – hafnium oxide system allows detailed investigations of external influences during fabrication. This report analyzes the ferroelectric properties of two thin film capacitors, which were post-deposition annealed in N2 and O2 atmospheres to achieve the orthorhombic phase after room temperature deposition. The samples, which exhibit very similar constituent phase, appear identical in conventional polarization-field hysteresis measurements. However, a significant switching speed difference is observed in pristine devices. Continued field cycling reduces the difference. Deeper analysis of switching transients based on the Nucleation Limited Switching model suggests that the O2 heat treatment atmosphere results in an altered oxygen vacancy profile, which is reverted during ferroelectric cycling.
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General Anesthesia versus Conscious Sedation in Mechanical Thrombectomy
Katharina Feil,Moriz Herzberg,Franziska Dorn,Steffen Tiedt,Clemens Küpper,Dennis C. Thunstedt,Ludwig C. Hinske,Konstanze Mühlbauer,Sebastian Goss,Thomas Liebig,Marianne Dieterich,Andreas Bayer,Lars Ke 대한뇌졸중학회 2021 Journal of stroke Vol.23 No.1
Background and Purpose: Anesthesia regimen in patients undergoing mechanical thrombectomy (MT) is still an unresolved issue. Methods: We compared the effect of anesthesia regimen using data from the German StrokeRegistry- Endovascular Treatment (GSR-ET) between June 2015 and December 2019. Degreeof disability was rated by the modified Rankin Scale (mRS), and good outcome was defined as mRS 0–2. Successful reperfusion was assumed when the modified thrombolysis in cerebral infarction scale was 2b–3. Results: Out of 6,635 patients, 67.1% (n=4,453) patients underwent general anesthesia (GA), 24.9% (n=1,650) conscious sedation (CS), and 3.3% (n=219) conversion from CS to GA. Rate of successful reperfusion was similar across all three groups (83.0% vs. 84.2% vs. 82.6%, P=0.149). Compared to the CA-group, the GA-group had a delay from admission to groin (71.0 minutes vs. 61.0 minutes, P<0.001), but a comparable interval from groin to flow restoration (41.0 minutes vs. 39.0 minutes). The CS-group had the lowest rate of periprocedural complications (15.0% vs. 21.0% vs. 28.3%, P<0.001). The CS-group was more likely to have a good outcome at follow-up (42.1% vs. 34.2% vs. 33.5%, P<0.001) and a lower mortality rate (23.4% vs. 34.2% vs. 26.0%, P<0.001). In multivariable analysis, GA was associated with reduced achievement of good functional outcome (odds ratio [OR], 0.82; 95% confidence interval [CI], 0.71 to 0.94; P=0.004) and increased mortality (OR, 1.42; 95% CI, 1.23 to 1.64; P<0.001). Subgroup analysis for anterior circulation strokes (n=5,808) showed comparable results. Conclusions: We provide further evidence that CS during MT has advantages over GA in terms of complications, time intervals, and functional outcome.
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Antonios Zambounis,Emmanuel Gaquerel,Martina Strittmatter,Jean-Pierre Salaün,Philippe Potin,Frithjof C. Küpper 한국조류학회I 2012 ALGAE Vol.27 No.1
We report an oxidative burst triggered by prostaglandin A2 (PGA2) in the brown algal kelp Laminaria digitata, constituting the first such discovery in an alga and the second finding of an oxidative burst triggered by a prostaglandin in a living organism. The response is more powerful than the oxidative burst triggered by most other chemical elicitors in Laminaria. Also, it is dose-dependent and cannot be inhibited by diphenylene iodonium, suggesting that another source than NAD(P)H oxidase is operational in the production of reactive oxygen species. Despite the very strong oxidative response, rather few effects at other levels of signal transduction pathways could be identified. PGA2 does not increase lipolysis (free fatty acids) in Laminaria, and only one oxylipin (15-hydroxyeicosatetraenoic acid; 15-HETE) was found to be upregulated in Laminaria. In a subsequent set of experiments in the genome model Ectocarpus siliculosus, none of 5selected candidate genes, all established participants in various stress responses, showed any significant differences in their expression profiles.
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