The three dimensionality of triple quantum dot stability diagrams

We present the full three dimensionality of an electrostatically calculated stability diagram for triple quantum dots. The stability diagram maps out the favored charge configuration of the system as a function of potential shifts due to gate voltages. For triple dots only a three-dimensional visualization allows for the complete identification of all its components. Those are most notably the so-called quadruple points where four electronic configurations are degenerate, and quantum cellular automata processes. The exact positions of these features within the stability diagram are now revealed. Furthermore, the influence on transport is studied by comparing the model with a two-path triple quantum dot made with local anodic oxidation. The two-path setup allows us to study the influence of the dots' arrangement.BMBF/nanoQUI

Produktionsprogrammplanung unter Einbeziehung von Preis-Absatz-Funktionen und Lernkurveneffekten

Eine der Managementaufgaben besteht im Treffen von Entscheidungen, wobei im Sinne der normativen Entscheidungstheorie ein reales Entscheidungsproblem in Form eines Entscheidungsmodells abzubilden und mit geeigneten Verfahren zu lösen ist. Die Modellierung betriebswirtschaftlicher Entscheidungsprobleme erfolgt im operativen und taktischen Bereich vielfach unter der Annahme linearer Kosten- und Erlösfunktionen. Dieser Sachverhalt ergibt sich in erster Linie aus den verwendeten Systemen der internen Unternehmensrechnung. So werden entscheidungsrelevante Kosten und Erlöse üblicherweise mit der Grenzkosten- und Grenzerlösrechnung geplant, wobei gemäß den Prämissen dieser Systeme alle Einflussgrößen bis auf die Produktions- bzw. Absatzmengen als konstant unterstellt werden.1 Ein weiterer Grund für die Verwendung linearer Funktionsverläufe besteht darin, dass die Einbeziehung nichtlinearer Zusammenhänge vielfach zu Modellstrukturen führt, deren Lösbarkeit bei größeren Modelldimensionen als problematisch anzusehen ist. Allerdings kann die Beschränkung auf lineare Erlös- und Kostenstrukturen zu einer zu vereinfachenden Modellierung der realen Entscheidungssituation führen, da die Absatzpreise und Stückkosten oft in nichtlinearen Zusammenhängen zu den Absatz- und Produktionsmengen stehen. Exemplarisch lassen sich Preis-Absatz-Funktionen, Lernkurveneffekte, sprungfixe Kosten- bzw. Erlösverläufe und Variablenprodukte nennen. In diesem Sinn besteht das erste Ziel dieser Arbeit in der Erarbeitung von Ansätzen zur Einbeziehung nichtlinearer Zusammenhänge in betriebswirtschaftliche Entscheidungsprobleme

Atrial fibrillation is frequent but does not affect risk stratification in pulmonary embolism

Background: Although prior studies indicate a high prevalence of atrial fibrillation (AF) in patients with pulmonary embolism (PE), the exact prevalence and prognostic impact are unknown. Methods: We aimed to investigate the prevalence, risk factors and prognostic impact of AF on risk stratification, in-hospital adverse outcomes and mortality in 528 consecutive PE patients enrolled in a single-centre registry between 09/2008 and 09/2017. Results: Overall, 52 patients (9.8%) had known AF and 57 (10.8%) presented with AF on admission; of those, 34 (59.6%) were newly diagnosed with AF. Compared to patients with no AF, overt hyperthyroidism was associated with newly diagnosed AF (OR 7.89 [2.99–20.86]), whilst cardiovascular risk comorbidities were more frequently observed in patients with known AF. Patients with AF on admission had more comorbidities, presented more frequently with tachycardia and elevated cardiac biomarkers and were hence stratified to higher risk classes. However, AF on admission had no impact on in-hospital adverse outcome (8.3%) and in-hospital mortality (4.5%). In multivariate logistic regression analyses corrected for AF on admission, NT-proBNP and troponin elevation as well as higher risk classes in risk assessment models remained independent predictors of an in-hospital adverse outcome. Conclusion: Atrial fibrillation is a frequent finding in PE, affecting more than 10% of patients. However, AF was not associated with a higher risk of in-hospital adverse outcomes and did not affect the prognostic performance of risk assessment strategies. Thus, our data support the use of risk stratification tools for patients with acute PE irrespective of the heart rhythm on admission

Survey report for CRIMAC SFI 2023

This cruise report describes the objectives, methods, and preliminary results from the tasks carried out at the CRIMAC SFI survey. The survey was conducted on board RV G.O. Sars between November 15th (Tromsø) and November 21st (Tromsø); in the fjords around Tromsø, from Malangen to Kvænangen. The main objective was to test the Kongsberg Sounder capabilities, including noise testing, weather window testing and safe operations. Other tasks were broad banded calibration procedures, testing two new Kongsberg discovery transducers (18kHz and 333kHz), automated predictions from the deep vision system, and an experiment testing whether herring are affected from a whale deterring device or not (FHF project).Survey report for CRIMAC SFI 2023publishedVersio

Multiomics in the central Arctic Ocean for benchmarking biodiversity change

Multiomics approaches need to be applied in the central Arctic Ocean to benchmark biodiversity change and to identify novel species and their genes. As part of MOSAiC, EcoOmics will therefore be essential for conservation and sustainable bioprospecting in one of the least explored ecosystems on Earth

Two-path transport measurements with bias dependence on a triple quantum dot

We present transport measurements on a lateral triple quantum dot with a star-like geometry and one lead attached to each dot. [1] The system is studied in a regime close to established quadruple points, where all three dots are in resonance. The specific sample structure allows us to apply two different bias voltages to the two source leads and thus to study the influence between the paths with serial double dots. © 2013 AIP Publishing LLC

Quantum dot device tunable from single to triple dot system

We present a lateral quantum dot device which has a tunable number of quantum dots. Depending on easily tunable gate voltages, one, two or three quantum dots are found. They are investigated in transport and charge detection. © 2013 AIP Publishing LLC

Probing spin configurations in quantum dots

We study the magnetoconductance of lateral quantum dots in high magnetic fields. We use spin blockade and Kondo effect to investigate the spin configuration and the spin filling mechanism and find a dependence on the electron number of the quantum dot. © 2007 American Institute of Physics

Spin droplet formation in quantum dots

A lateral quantum dot with approx. 50 electrons is analyzed in high perpendicular magnetic fields. In a regime with two Landau levels (LL) in the quantum dot information about the spin structure is gained by investigating the position of Coulomb blockade peaks. A typical zig-zag pattern is observed which is roughly explained with the so called Constant Interaction model. However, only states from LL0 can be approximated with this model, while for LL1 more complex electron-electron interactions must be included. This is done with spin density functional theory calculations. As a result, full spin polarization is found for LL1, the so called spin droplet. © 2011 American Institute of Physics

Relation of Left Ventricular Mass to Prognosis in Initially Asymptomatic Mild to Moderate Aortic Valve Stenosis

Background—The prognostic importance of left ventricular (LV) mass in nonsevere asymptomatic aortic stenosis has not been documented in a large prospective study. Methods and Results—Cox regression analysis was used to assess the impact of echocardiographic LV mass on rate of major cardiovascular events in 1656 patients (mean age, 67 years; 39.6% women) with mild-to-moderate asymptomatic aortic stenosis participating in the Simvastatin Ezetimibe in Aortic Stenosis (SEAS) study. Patients were followed during 4.3 years of randomized treatment with combined simvastatin 40 mg and ezetimibe 10 mg daily or placebo. At baseline, LV mass index was 45.9+14.9 g/m2.7, and peak aortic jet velocity was 3.09+0.54 m/s. During follow-up, 558 major cardiovascular events occurred. In Cox regression analyses, 1 SD (15 g/m2.7) higher baseline LV mass index predicted increases in hazards of 12% for major cardiovascular events, 28% for ischemic cardiovascular events, 34% for cardiovascular mortality, and 23% for combined total mortality and hospitalization for heart failure (all P<0.01), independent of confounders. In time-varying models, taking the progressive increase in LV mass index during follow-up into account, 1 SD higher in-study LV mass index was consistently associated with 13% to 61% higher hazard for cardiovascular events (all P<0.01), independent of age, sex, body mass index, valvuloarterial impedance, LV ejection fraction and concentricity, and the presence of concomitant hypertension. Conclusions—Higher LV mass index is independently associated with increased cardiovascular morbidity and mortality during progression of aortic stenosis