251 research outputs found
A high performance transparent resistive switching memory made from ZrO2/AlON bilayer structure
No full textIn this study, the switching properties of an indium tin oxide (ITO)/zirconium oxide (ZrO2)/ITO single layer device and those of a device with an aluminum oxynitride (AlON) layer were investigated. The devices with highly transparent characteristics were fabricated. Compared with the ITO/ZrO2/ITO single layer device, the ITO/ZrO2/AlON/ITO bilayer device exhibited a larger ON/OFF ratio, higher endurance performance, and superior retention properties by using a simple two-step forming process. These substantial improvements in the resistive switching properties were attributed to the minimized influence of oxygen migration through the ITO top electrode (TE), which can be realized by forming an asymmetrical conductive filament with the weakest part at the ZrO2/AlON interface. Therefore, in the ITO/ZrO2/AlON/ITO bilayer device, the regions where conductive filament formation and rupture occur can be effectively moved from the TE interface to the interior of the device. Published by AIP Publishing.Ministry of Science and Technology, Taiwan [NSC 102-2221-E009-134-MY3]SCI(E)[email protected]
Prognostic Value of Noninvasively Obtained Left Ventricular Contractile Reserve in Patients With Severe Heart Failure
No full textAbstractObjectives. The present study sought to evaluate the prognostic value of contractile reserve measured noninvasively during dobutamine infusion in patients with severe heart failure.Background. In patients with severe heart failure there is a great need for objective criteria to define candidates for heart transplantation or intensive medical treatment. Cardiac pumping performance reserve has been shown to have excellent prognostic value in patients with cardiogenic shock.Methods. Cardiac peak power, an afterload-independent contractility index, was measured noninvasively at rest and at peak dobutamine inotropic stimulation. Contractile reserve was defined as the difference between maximal cardiac power at peak dobutamine dose and baseline value. Maximal cardiac power was calculated from the maximal product of validated central arterial pressure and aortic flow.Results. Results were obtained from 52 subjects (42 patients, 10 control subjects). Twenty-two patients were in New York Heart Association functional classes III and IV. Of nine patients with a contractile reserve <1.5 W/ml, eight died during the 3-year follow-up period. In contrast, all survivors had a contractile reserve >1.5 W/ml. Using multiple logistic regression analysis, contractile reserve was shown to be the only predictor of survival.Conclusions. Contractile reserve measured noninvasively during dobutamine infusion is a valuable prognostic indicator in patients with severe heart failure, with added value to ejection fraction.(J Am Coll Cardiol 1997;29:422–8
The Arterial Response to an Exercise Stress Test in Healthy Subjects, Hypertensives, and Patients with Left-Ventricular Dysfunction
No full textHormonal Replacement Therapy Induces False-Positive ST-Segment Depression in Middle-Aged Women
No full textProduct structure extension of the Alon--Seymour--Thomas theorem
No full textAlon, Seymour and Thomas [1990] proved that every -vertex graph excluding as a minor has treewidth less than . Illingworth, Scott and Wood [2022] recently refined this result by showing that every such graph is a subgraph of some graph with treewidth , where each vertex is blown up by a complete graph of order . Solving an open problem of Illingworth, Scott and Wood [2022], we prove that the treewidth bound can be reduced to while keeping blowups of order . As an extension of the Lipton--Tarjan theorem, in the case of planar graphs, we show that the treewidth can be further reduced to , which is best possible. We generalise this result for -minor-free graphs, with blowups of order . This setting includes graphs embeddable on any fixed surface.Title changed, author added, and results for -minor-free graphs added in v2. Referee comments incorporated into v
UCC Actors Hit the Beach in "Never Swim Alone"
No full textPress ReleaseDaniel MacIvorNever Swim Alon
The effect of flosequinan in patients with acute-onset heart failure complicating acute myocardial infarction.
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