325 research outputs found
(Extended) Kronecker quivers and amenability
We apply the notion of hyperfinite families of modules to the wild path
algebras of extended Kronecker quivers . While the preprojective
and postinjective component are hyperfinite, we show the existence of a family
of non-hyperfinite modules in the regular component for some . Making use of
dimension expanders to achieve this, our construction is more explicit than
previous results.Comment: 13 page
German Foreign Direct Investment in China
本论文全面分析了德国企业在中国的投资问题。论文研究了德国企业进入中国的模式、并借助GIC2007年各类德国对华投资企业的调查分析了德国公司在华投资遇到的问题。论文最后就有关如何改善包括德国企业在内的对华投资政策方面提出一些政策建议。This paper provides a comprehensive factual overview on the German foreign direct investment in China. Furthermore, the entry-mode decisions of German-invested companies are examined, combined with and clarified by an analysis of the obstacles those companies face in the Chinese economic and business framework today. A profound survey conducted by the German Industry & Commerce China (GIC) in 2007...学位:经济学硕士院系专业:经济学院国际硕士_政治经济学学号:1522009115393
Geistig fit durch mediterrane Kost? : Wie Menschen gesünder alt werden können
In südlichen Gefilden wächst so manches, was in Maßen genossen dem Wohlbefinden dient. Dies gilt nicht nur für Heilkräuter und Rotwein, sondern vermutlich auch für andere für den Mittelmeerraum typische Getränke und Speisen. Auf der Suche nach diesen "natürlichen Apotheken" erfassen Wissenschaftler aus Deutschland und sechs weiteren europäischen Ländern derzeit seltene Unterarten bewährter Nutzpflanzen wie Thymian, Olive, Wein und Orange. Sie erforschen, ob die seit Jahrhunderten überlieferten Schutzund Heilungskräfte der Gewächse einer wissenschaftlichen Prüfung standhalten und worauf sie beruhen. Die Frankfurter Gruppe um Prof. Dr. Walter Müller hat dabei insbesondere Stoffe im Blick, die das Nervensystem beeinflussen. Macht mediterrane Kost wirklich geistig fit
Synchronizing the helicity of Rayleigh-B\'enard convection by a tide-like electromagnetic forcing
We present results on the synchronization of the helicity in a liquid-metal
Rayleigh-B\'enard (RB) experiment under the influence of a tide-like
electromagnetic forcing with azimuthal wavenumber m=2. We show that for a
critical forcing strength the typical Large Scale Circulation (LSC) in the
cylindrical vessel of aspect ratio unity is entrained by the period of the
tide-like forcing, leading to synchronized helicity oscillations with opposite
signs in two half-spaces. The obtained experimental results are consistent with
and supported by numerical simulations. A similar entrainment mechanism for the
helicity in the solar tachocline may be responsible for the astonishing
synchronization of the solar dynamo by the 11.07-year triple synodic alignment
cycle of the tidally dominant planets Venus, Earth and Jupiter
Correlation properties of spontaneous motor activity in healthy infants: a new computer-assisted method to evaluate neurological maturation
Qualitative assessment of spontaneous motor activity in early infancy is widely used in clinical practice. It enables the description of maturational changes of motor behavior in both healthy infants and infants who are at risk for later neurological impairment. These assessments are, however, time-consuming and are dependent upon professional experience. Therefore, a simple physiological method that describes the complex behavior of spontaneous movements (SMs) in infants would be helpful. In this methodological study, we aimed to determine whether time series of motor acceleration measurements at 40-44weeks and 50-55weeks gestational age in healthy infants exhibit fractal-like properties and if this self-affinity of the acceleration signal is sensitive to maturation. Healthy motor state was ensured by General Movement assessment. We assessed statistical persistence in the acceleration time series by calculating the scaling exponent α via detrended fluctuation analysis of the time series. In hand trajectories of SMs in infants we found a mean α value of 1.198 (95% CI 1.167-1.230) at 40-44weeks. Alpha changed significantly (p=0.001) at 50-55weeks to a mean of 1.102 (1.055-1.149). Complementary multilevel regression analysis confirmed a decreasing trend of α with increasing age. Statistical persistence of fluctuation in hand trajectories of SMs is sensitive to neurological maturation and can be characterized by a simple parameter α in an automated and observer-independent fashion. Future studies including children at risk for neurological impairment should evaluate whether this method could be used as an early clinical screening tool for later neurological compromis
Predictive Value of HAS-BLED Score Regarding Bleeding Events and Graft Survival following Renal Transplantation
Objective: Due to the high prevalence and incidence of cardio- and cerebrovascular diseases
among dialysis-dependent patients with end-stage renal disease (ERSD) scheduled for kidney
transplantation (KT), the use of antiplatelet therapy (APT) and/or anticoagulant drugs in this patient
population is common. However, these patients share a high risk of complications, either due to
thromboembolic or bleeding events, which makes adequate peri- and post-transplant anticoagulation
management challenging. Predictive clinical models, such as the HAS-BLED score developed for
predicting major bleeding events in patients under anticoagulation therapy, could be helpful tools for
the optimization of antithrombotic management and could reduce peri- and postoperative morbidity
and mortality. Methods: Data from 204 patients undergoing kidney transplantation (KT) between
2011 and 2018 at the University Hospital Leipzig were retrospectively analyzed. Patients were
stratified and categorized postoperatively into the prophylaxis group (group A)—patients without
pretransplant anticoagulation/antiplatelet therapy and receiving postoperative heparin in prophylactic
doses—and into the (sub)therapeutic group (group B)—patients with postoperative continued
use of pretransplant antithrombotic medication used (sub)therapeutically. The primary outcome
was the incidence of postoperative bleeding events, which was evaluated for a possible association
with the use of antithrombotic therapy. Secondary analyses were conducted for the associations of
other potential risk factors, specifically the HAS-BLED score, with allograft outcome. Univariate and
multivariate logistic regression as well as a Cox proportional hazard model were used to identify risk
factors for long-term allograft function, outcome and survival. The calibration and prognostic accuracy
of the risk models were evaluated using the Hosmer–Lemshow test (HLT) and the area under
the receiver operating characteristic curve (AUC) model. Results: In total, 94 of 204 (47%) patients received
(sub)therapeutic antithrombotic therapy after transplantation and 108 (53%) patients received
prophylactic antithrombotic therapy. A total of 61 (29%) patients showed signs of postoperative
bleeding. The incidence (p < 0.01) and timepoint of bleeding (p < 0.01) varied significantly between
the different antithrombotic treatment groups. After applying multivariate analyses, pre-existing
cardiovascular disease (CVD) (OR 2.89 (95% CI: 1.02–8.21); p = 0.04), procedure-specific complications
(blood loss (OR 1.03 (95% CI: 1.0–1.05); p = 0.014), Clavien–Dindo classification > grade II (OR 1.03
(95% CI: 1.0–1.05); p = 0.018)), HAS-BLED score (OR 1.49 (95% CI: 1.08–2.07); p = 0.018), vit K antagonists
(VKA) (OR 5.89 (95% CI: 1.10–31.28); p = 0.037), the combination of APT and therapeutic
heparin (OR 5.44 (95% CI: 1.33–22.31); p = 0.018) as well as postoperative therapeutic heparin (OR 3.37
(95% CI: 1.37–8.26); p < 0.01) were independently associated with an increased risk for bleeding. The
intraoperative use of heparin, prior antiplatelet therapy and APT in combination with prophylactic heparin was not associated with increased bleeding risk. Higher recipient body mass index (BMI)
(OR 0.32 per 10 kg/m2 increase in BMI (95% CI: 0.12–0.91); p = 0.023) as well as living donor KT
(OR 0.43 (95% CI: 0.18–0.94); p = 0.036) were associated with a decreased risk for bleeding. Regarding
bleeding events and graft failure, the HAS-BLED risk model demonstrated good calibration (bleeding
and graft failure: HLT: chi-square: 4.572, p = 0.802, versus chi-square: 6.52, p = 0.18, respectively) and
moderate predictive performance (bleeding AUC: 0.72 (0.63–0.79); graft failure: AUC: 0.7 (0.6–0.78)).
Conclusions: In our current study, we could demonstrate the HAS-BLED risk score as a helpful tool
with acceptable predictive accuracy regarding bleeding events and graft failure following KT. The
intensified monitoring and precise stratification/assessment of bleeding risk factors may be helpful
in identifying patients at higher risks of bleeding, improved individualized anticoagulation decisions
and choices of antithrombotic therapy in order to optimize outcome after kidney transplantatio
Обоснование закономерности изменения чистоты поверхности явлениями процесса образования стружки
Frequency and characteristics of diabetes in lipodystrophies and insulin receptoropathies compared with type 1 and type 2: results from the multicenter DPV registry
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