Defining optimal thickness for maximal self-fieldJcin YBCO/CeOmultilayers grown on buffered metal.

The effect of multilayering YBaCuO6+x(YBCO) thin films with sequentially deposited CeOlayers between YBCO layers grown on buffered metallic template is investigated to optimize the self-field critical current densityJc(0). We have obtained that the improvement inJc(0)clearly depends on the YBCO layer thickness and temperature, where at high temperatureJc(0)can be increased even 50% when compared with the single layer YBCO films. Based on our experimental results and theoretical approach to the growth mechanism during multilayer deposition, we have defined a critical thickness for the YBCO layer, where the maximal self-fieldJc(0)is strongly related to the competing issues between the uniform and nonuniform strain relaxation and the formation of dislocations and other defects during the film growth.

Measuring psychosocial stress with heart rate variability-based methods in different health and age groups.

Autonomic nervous system function and thereby bodily stress and recovery reactions may be assessed by wearable devices measuring heart rate (HR) and its variability (HRV). So far, the validity of HRV-based stress assessments has been mainly studied in healthy populations. In this study, we determined how psychosocial stress affects physiological and psychological stress responses in both young (18-30 years) and middle-aged (45-64 years) healthy individuals as well as in patients with arterial hypertension and/or either prior evidence of prediabetes or type 2 diabetes.