Determination of the Distribution of the Relaxation Times from Dielectric Spectra

The dielectric susceptibility measurements are usually interpreted in terms of the relaxation times of various dynamical processes. Using the simple examples of the simulated spectra it is shown how the distribution of these relaxation times can be obtained by means of the integral equations solved with the Tikhonov regularization technique, and the criteria for the choice of the regularization parameter is discussed

Cortisol levels and neuropsychiatric diagnosis as markers of postoperative delirium: a prospective cohort study

Polish Ministry of Science and Higher Education, Grant No. 0174/P01/2010/70; 504-06-011

Parametric amplification via superconducting contacts in a Ka band niobium pillbox cavity

Superconducting parametric amplifiers are commonly fabricated using planar transmission lines with a non-linear inductance provided by either Josephson junctions or the intrinsic kinetic inductance of the thin film. However, Banys et al. [1] reported non-linear behaviour in a niobium pillbox cavity, hypothesising that below Tc, the pair iris-bulk resonator would act as a superconducting contact surface exploiting a Josephson-like non-linearity. This work investigates this effect further by applying Keysight Technologies' Advanced Design System (ADS) to simulate the cavity using an equivalent circuit model that includes a user defined Josephson inductance component. The simulations show that for a resonance centred at nu0 = 30.649 GHz, when two tones (pump and signal) are injected into the cavity, mixing and parametric gain occur. The maximum achievable gain is explored when the resonator is taken to its bifurcation energy. These results are compared to cryogenic measurements where the pump and signal are provided by a Vector Network Analyzer

Parametric amplification via superconducting contacts in a Ka band niobium pillbox cavity

Superconducting parametric amplifiers are commonly fabricated using planar transmission lines with a non-linear inductance provided by either Josephson junctions or the intrinsic kinetic inductance of the thin film. However, Banys et al. [1] reported non-linear behaviour in a niobium pillbox cavity, hypothesising that below Tc, the pair iris-bulk resonator would act as a superconducting contact surface exploiting a Josephson-like non-linearity. This work investigates this effect further by applying Keysight Technologies' Advanced Design System (ADS) to simulate the cavity using an equivalent circuit model that includes a user defined Josephson inductance component. The simulations show that for a resonance centred at nu0 = 30.649 GHz, when two tones (pump and signal) are injected into the cavity, mixing and parametric gain occur. The maximum achievable gain is explored when the resonator is taken to its bifurcation energy. These results are compared to cryogenic measurements where the pump and signal are provided by a Vector Network Analyzer

Canopy Changes of Brachiaria Managed Under Continuous Stocking in the Dry-Water Transition

Pasture supplementation is an alternative to take advantage of the forage mass deferred in the rainy season and maintain or provide weight gain in periods of rain absence. The objective was to compare the structural characteristics, mass production, density and population dynamics of tillers of Urochloa brizantha cv. ‘Paiaguas’ and U. spp. cv. ‘Convert’ under fixed and continuous stocking with steers supplemented in the trough or on the ground in the water/dry transition period. The experiment was carried out at Jatai Federal University, from March to June, in a completely randomized design and a 2x2 factorial scheme, using six paddocks/treatment. The completely randomized design was adopted and variance analysis was performed with software SAS following the GLM procedure, were compared using repeated-measures. There was a significant interaction between Brachiaria and the method of supplementation for basal, aerial, and total tiller density. Convert had an average of 551 basal and 577 total tiller/m2. Paiaguas grass presented higher tiller density (1,03 vs. 582 tiller/m2) and higher tiller birth rate (12.92 vs. 9.14%) than Convert. No significant difference was observed between brachiarias. The average height of Paiaguas was 62.34 and 50.70 cm for Convert. The average height was 57.83 and on the ground it was 54.90 cm. Supplementation offer method changed Paiaguas canopy. The Convert showed higher leaf and dead mass production but lower weeds despite its smaller tillering

Mass Production and Morphology of Marandu Brachiaria Under Different Nitrogen Rates in the Brazilian Savannah

Nitrogen is the nutrient that most contributes to increase forage productivity and quality. The objective was to evaluate Marandu brachiaria submitted to nitrogen doses in the Brazilian savannah through the total and green mass production, leaf:stem and brachiaria:weed ratio. Plots were established in a randomized block design, with four replications and four N doses 0, 50, 100 and 150 kg N/ha). After the uniformization cut, the data collect cycles occurred when the canopy reached 30 cm average height. Samples were taken until 15 cm from the ground in an area of 0.25 m2. Fractions were separated according botanical (brachiaria and weeds) and morphological (leaf, stem, dead material and inflorescence) components. The highest value of dry matter production and green mass production occurred at 96 and 72 kg N/ha dose (2,669 kg and 1,946 DM/ha). Above and below this value the mass production decreased . The highest relation green mass:dead material ratio was 4.00 at 150 kg N/ha dose. Marandu was able to control the weeds, and the best performance (4.67) was observed at 78 kg N/ha dose. Forage accumulation rate is the mass production/day and the highest accumulation rate occurred at 50 kg N/ha dose. Marandu had higher leaf:stem ratio with nitrogen dose 107 kg N/ha but above 50 kg/N the mass accumulation rate decrease which means that the fertilization cost is not favorable over up this dose, especially above dose 72 kg N/kg when there green mass production decrease