Physical Insights of Low Thermal Expansion Coefficient Electrode Stress Effect on Hafnia-Based Switching Speed

In this report, we investigate the effect of low coefficient of thermal expansion (CTE) metals on the operating speed of hafnium-based oxide capacitance. We found that the cooling process of low CTE metals during rapid thermal annealing (RTA) generates in-plane tensile stresses in the film, This facilitates an increase in the volume fraction of the o-phase and significantly improves the domain switching speed. However, no significant benefit was observed at electric fields less than 1 MV/cm. This is because at low voltage operation, the defective resistance (dead layer) within the interface prevents electron migration and the increased RC delay. Minimizing interface defects will be an important key to extending endurance and retention

Stamp transferred suspended graphene mechanical resonators for radio-frequency electrical readout

We present a simple micromanipulation technique to transfer suspended graphene flakes onto any substrate and to assemble them with small localized gates into mechanical resonators. The mechanical motion of the graphene is detected using an electrical, radio-frequency (RF) reflection readout scheme where the time-varying graphene capacitor reflects a RF carrier at f=5-6 GHz producing modulation sidebands at f +/- fm. A mechanical resonance frequency up to fm=178 MHz is demonstrated. We find both hardening/softening Duffing effects on different samples, and obtain a critical amplitude of ~40 pm for the onset of nonlinearity in graphene mechanical resonators. Measurements of the quality factor of the mechanical resonance as a function of DC bias voltage Vdc indicate that dissipation due to motion-induced displacement currents in graphene electrode is important at high frequencies and large Vdc

Acupuncture and safety for post-stroke hiccups: An overview of systematic reviews

Methods: Four international electronic databases (Cochrane database, PubMed, Embase, Web of Science) and four Chinese electronic databases (China National Knowledge Infrastructure, Wanfang database, SinoMed database and VIP database) were searched from their creation to February 4, 2023. Search terms such as “Acupuncture”, “Hiccup”, “Stroke” and “Meta analysis” were used.Data extraction and analysis: The risk of bias, quality of reporting and evidence for SRs were assessed by the risk of bias in systematic reviews (ROBIS) tool, the preferred reporting items for systematic reviews and meta-analyses (PRISMA 2020), and the quality of evidence for outcome measures by recommending grading, assessment, development and Evaluation (GRADE) for assessment. Two reviewers independently performed data extraction and analysis, and the degree of agreement was scored using the κ index.Results: Seven SRs met the inclusion criteria. In PRISMA 2020 reporting quality assessment, there were missing key reporting items and incomplete reporting of other items in the topics of structured abstracts, protocols and registrations, search strategies, risk of bias, data extraction, analysis templates and codes, and conflicts of interest. All SRs were rated as high risk of bias based on the ROBIS tool. According to the GRADE system, the results were all rated as low-quality evidence. Limitations of the original trial and publication bias topped the list of downgrading factors, followed by inconsistency and imprecision.THIS DATASET IS ARCHIVED AT DANS/EASY, BUT NOT ACCESSIBLE HERE. TO VIEW A LIST OF FILES AND ACCESS THE FILES IN THIS DATASET CLICK ON THE DOI-LINK ABOV