Real Slices of SL(r,C){\rm SL}(r,\mathbb{C})-Opers

Through the action of an anti-holomorphic involution $\sigma$ (a real structure) on a Riemann surface $X$, we consider the induced actions on ${\rm SL}(r,\mathbb{C})$-opers and study the real slices fixed by such actions. By constructing this involution for different descriptions of the space of ${\rm SL}(r,\mathbb{C})$-opers, we are able to give a natural parametrization of the fixed point locus via differentials on the Riemann surface, which in turn allows us to study their geometric properties

Der deutsche Lebensmittelonlinehandel : eine Markt- und Wettbewerbsanalyse anhand von ausgewählten Onlineshops

Die vorliegende Bachelorarbeit beschäftigt sich mit dem deutschen Lebensmittelonlinehandel, klärt wie weit diese Vertriebsform entwickelt ist und welche Wettbewerber es gibt. Nach einer Einführung zum Thema erfolgt zunächst eine Marktanalyse, die die Marktgegebenheiten, gesetzlichen Rahmenbedingungen, Kunden- und Zielgruppen behandelt. Auch wird ein Einblick in die Märkte von Großbritannien und Frankreich gegeben. Anschließend erfolgt die Wettbewerbsanalyse, die einen Überblick über die Fülle der Wettbewerber gibt und verschiedene Anbieter anhand ihrer Onlineshops behandelt. Am Ende der Arbeit werden zukünftige Entwicklungen in Bezug auf Logistik und Zielgruppen genannt. Ergebnis der Arbeit ist, dass der Lebensmittelonlinehandel in Deutschland bisher nur ein Nischenmarkt ist und die Zukunft von vielen unterschiedlichen Faktoren abhängt. Der Kundenfokus sollte besonders auf Menschen liegen die wenig Zeit haben einkaufen zu gehen, oder auf solchen, die es körperlich nicht können. Aber besonders die Optimierung von Verpackung und Lieferung der verderblichen Lebensmittel ist eine Grundvoraussetzung, um zukünftig im Onlinegeschäft erfolgreich zu sein

A True Random Number Generator for Probabilistic Computing using Stochastic Magnetic Actuated Random Transducer Devices

Magnetic tunnel junctions (MTJs), which are the fundamental building blocks of spintronic devices, have been used to build true random number generators (TRNGs) with different trade-offs between throughput, power, and area requirements. MTJs with high-barrier magnets (HBMs) have been used to generate random bitstreams with $\lesssim$ 200~Mb/s throughput and pJ/bit energy consumption. A high temperature sensitivity, however, adversely affects their performance as a TRNG. Superparamagnetic MTJs employing low-barrier magnets (LBMs) have also been used for TRNG operation. Although LBM-based MTJs can operate at low energy, they suffer from slow dynamics, sensitivity to process variations, and low fabrication yield. In this paper, we model a TRNG based on medium-barrier magnets (MBMs) with perpendicular magnetic anisotropy. The proposed MBM-based TRNG is driven with short voltage pulses to induce ballistic, yet stochastic, magnetization switching. We show that the proposed TRNG can operate at frequencies of about 500~MHz while consuming less than 100~fJ/bit of energy. In the short-pulse ballistic limit, the switching probability of our device shows robustness to variations in temperature and material parameters relative to LBMs and HBMs. Our results suggest that MBM-based MTJs are suitable candidates for building fast and energy-efficient TRNG hardware units for probabilistic computing.Comment: 10 pages, 10 figures, Accepted at ISQED 2023 for poster presentatio

Hypertension testing and treatment in Uganda and Kenya through the SEARCH study: An implementation fidelity and outcome evaluation.

BackgroundHypertension (HTN) is the single leading risk factor for human mortality worldwide, and more prevalent in sub-Saharan Africa than any other region [1]-although resources for HTN screening, treatment, and control are few. Most regional pilot studies to leverage HIV programs for HTN control have achieved blood pressure control in half of participants or fewer [2,3,4]. But this control gap may be due to inconsistent delivery of services, rather than ineffective underlying interventions.MethodsWe sought to evaluate the consistency of HTN program delivery within the SEARCH study (NCT01864603) among 95,000 adults in 32 rural communities in Uganda and Kenya from 2013-2016. To achieve this objective, we designed and performed a fidelity evaluation of the step-by-step process (cascade) of HTN care within SEARCH, calculating rates of HTN screening, linkage to care, and follow-up care. We evaluated SEARCH's assessment of each participant's HTN status against measured blood pressure and HTN history.FindingsSEARCH completed blood pressure screens on 91% of participants. SEARCH HTN screening was 91% sensitive and over 99% specific for HTN relative to measured blood pressure and patient history. 92% of participants screened HTN+ received clinic appointments, and 42% of persons with HTN linked to subsequent care. At follow-up, 82% of SEARCH clinic participants received blood pressure checks; 75% received medication appropriate for their blood pressure; 66% remained in care; and 46% had normal blood pressure at their most recent visit.ConclusionThe SEARCH study's consistency in delivering screening and treatment services for HTN was generally high, but SEARCH could improve effectiveness in linking patients to care and achieving HTN control. Its model for implementing population-scale HTN testing and care through an existing HIV test-and-treat program-and protocol for evaluating the intervention's stepwise fidelity and care outcomes-may be adapted, strengthened, and scaled up for use across multiple resource-limited settings