Defect chemistry of donor-doped BaTiO with BaO-excess for reduction resistant PTCR thermistor applications - redox-behaviour.

The electrical conductivity of donor-doped BaTiO thermistor ceramics with excessive BaO revealing a reduction-persistent PTCR effect has been carefully examined depending on materials' composition and oxygen partial pressure at moderate temperatures between 973 and 1273 K. This thermal regime represents the range which is relevant for the realization of insulating grain boundaries in these electrically inhomogeneous ceramic materials through reoxidation. Based on the experimental results strong evidence for a general correlation between the PTCR characteristics, DC-conductivity and the herewith associated defect chemistry significant to thermistor applications is presented for the system (Ba, La)TiO, where m designates the BaO-excess (m≥ 1).

Upfront treatment for newly diagnosed transplant-ineligible multiple myeloma patients: A systematic review and network meta-analysis of 14,533 patients over 29 randomized clinical trials.

Choice of treatment for newly diagnosed transplant-ineligible multiple myeloma poses a difficult task due to an ever-increasing plethora of different regimens. Attempting to clarify this subject, we performed a systematic review and Bayesian network meta-analysis of 29 randomized clinical trials, enrolling 14,533 patients, and comparing 25 different treatment regimens regarding overall survival(OS), progression-free survival(PFS), complete response(CR), overall response rate(ORR) and toxicity. Head-to-head comparisons for all regimens and ranking of best treatments are reported.

Improvement in clinical outcomes in acute coronary syndromes after the implementation of a critical pathway.

Although several advances have been made in the management of acute coronary syndromes, the adoption of such measures in clinical practice has been suboptimal. The implementation of critical pathways has been suggested as a strategy to improve clinical effectiveness, although its effect is still to be demonstrated. The objective was to evaluate the impact of a critical pathway on the process of care of patients admitted with acute coronary syndromes in a teaching hospital.

Polymorphism in micro-, submicro-, and nanocrystalline NaNbO3.

NaNbO(3) powders with various particle sizes (ranging from 30 nm to several microns) and well-controlled stoichiometry were obtained through microemulsion-mediated synthesis. The effect of particle size on the phase transformation of the prepared NaNbO(3) powders was studied using X-ray powder diffraction, Raman spectroscopy, and nuclear site group analysis based on these spectroscopic data. Coarsened particles exhibit an orthorhombic Pbcm (D(2h)(11), no.