Supercapacitance and superinductance of TiN and NbTiN films in the vicinity of superconductor-to-insulator transition

We investigate the low-temperature complex impedance of disordered insulating thin TiN and NbTiN films in the frequency region 400 Hz–1 MHz in close proximity to the superconductor–insulator transition (SIT). The frequency, temperature, and magnetic field dependencies of the real and imaginary parts of the impedance indicate that in full accord with the theoretical predictions and earlier observations, the films acquire self-induced electronic granularity and become effectively random arrays of superconducting granules coupled via Josephson links. Accordingly, the inductive component of the response is due to superconducting droplets, while the capacitive component results from the effective Josephson junctions capacitances. The impedance crosses over from capacitive to inductive behavior as films go across the transition.

An Electrochemical Impedance Study of Alkaline Water Splitting Using Fe Doped NiO Nanosheets

Mixed nickel-iron (Ni-Fe) compounds have recently emerged as promising non-precious electrocatalysts for alkaline water splitting. The understanding of the charge-transfer mechanism involved in the multi-step Faradic reaction, however, is still limited for the overall electrochemical process. In this paper, electrochemical impedance spectroscopy (EIS) measurements of Fe incorporated Ni oxide nanosheets were used to study the reaction kinetics for both hydrogen (HER) and oxygen (OER) evolution reactions in alkaline media. Our results showed that Fe incorporation improves the catalytic property of NiO nanosheets because of the lower reaction resistance and faster intermediate transformations. Detailed EIS modeling enables a separation of the surface coverage relaxation from the charge transfer resistance, with an inductive behavior observed in the low-frequency range for HER, holding important information on the dominating reaction mechanism. For OER, the good agreement between the EIS experimental results and a model with an inductance loop indicated that similar inductive behavior would be determining the EIS response at very low frequencies. The physical significance of the elementary steps gives insight into the governing reaction mechanisms involved in the electron and hole charge transfer, as well as the inherent properties of catalysts and their surface coverage relaxation.

Supercapacitance and Superinductance of TiN and NbTiN films in the Vicinity of Superconductor-to-Insulator Transition

We investigate the low temperature complex impedance of disordered insulating thin TiN and NbTiN films in the frequency region 400 Hz–1MHz in close proximity to the superconductor-insulator transition. The frequency, temperature, and magnetic field dependence of the real and imaginary parts of the impedance indicate the response of superconducting droplets resulting from self-induced electronic granularity. The impedance crosses over from capacitive to inductive behavior as the sample is driven through the transition, characterized by a divergent dielectric response.

Disciplinary behavior of mothers of preschool children: Effects of maternal effi cacy beliefs, children’s gender and age, and mothers’ education

Disciplining a child is one of the most challenging parental tasks. Efficacy beliefs contribute to make this experience more or less successful. The purpose of this study is to examine the predictive role of efficacy beliefs on maternal disciplinary behavior. A total of 128 mothers of pre-school aged children participated in this study. They were asked to complete the Parental Disciplinary Behavior Scale and the Efficacy Subscale of the Parenting Sense of Competence. Results showed that mothers use inductive behavior more frequently and perceive these behaviors as the most effective ones. Power assertion is explained by the child’s age, the mother’s educational level, her perception of parental self-efficacy and also by her maternal beliefs about the effectiveness of both power assertion and non-physical punishment. Non-physical punishment is explained by maternal beliefs regarding the effectiveness of both non-physical punishment and inductive behavior. Finally, induction is explained according to the child’s gender and the maternal belief about the effectiveness of these inductive behaviors. These results are especially relevant to the field of parenting intervention, underlining the importance of addressing efficacy beliefs to promote behavioral change.

IN VITRO OSTEO-INDUCTIVE CHARACTERIZATION OF NANO-GRADE PEARL POWDERS

The main objective of this study is to characterize the in vitro osteo inductive behavior of pearl nano crystallites. The results obtained from X-ray diffraction, Fourier transform infrared (FTIR) spectra, and inductively coupled plasma mass (ICP-MS) analysis demonstrate that the pearls can induce the formation of a hydroxyl apatite (HA) layer on their surface in simulated body fluid (SBF), even after only short soaking periods. Further, MC3T3-E1 cells can easily attach and spread on the pearl powders after 1 h of cultivation.

DC/AC Performance Analysis of Indium Antimonide Nanowires

ABSTRACTWe investigated the electrical properties and transmission line performance of indium antimonide nanowires. The results indicate that the of nanowires suffer from low mobility values on the order of 10-to-15 cm2V-1s-1 because of the contact resistances, scattering due to their small diameters, crystal defects and oxidation occurs during growth and cooling. nanowires show extremely inductive behavior during the AC measurements and due to these parasitic parameters, they can sustain transmission for the signals having frequencies up to 10 MHz. The bandwidth of the nanowires is directly proportional to the diameter of the nanowires. Improving the mobility to higher values and introducing de-embedding and impedance matching to the measurements and analysis could easily carry the bandwidth beyond GHz levels.