Preparation and electrical properties of dense micro-cermets made of nickel ferrite and metallic copper

Dense micro-cermets made of nickel ferrites and copper micrometric particles were obtained from partial reduction under hydrogenated atmosphere at 350 C of mixed copper nickel ferrites, and sintering in nitrogen at 980 C. The small copper particles are homogeneous in size and well dispersed in the spinel oxide matrix. No exudation of copper metal was observed after sintering. The micro-cermets prepared are semi-conducting materials with electrical conductivity lying from 44 to 130 S/cm at 980 C. Their overall characteristics make them interesting for inert anodes dedicated to aluminium electrolysis in melted cryolite

The social transmission of knowledge at the University: Teaching style and epistemic dependence

It is argued that an epistemic authority would induce greater influence in transmitting knowledge to students when there is a correspondence between the (authoritarian vs. democratic) style of the authority and students' perceptions of their relation to the authority (high vs. low epistemic dependence). In two studies it was predicted, and found, that students who perceived themselves in a state of low epistemic dependence towards their teachers were more influenced by a democratic than by an authoritarian teaching style. This difference in appropriation was not found for students who perceived themselves in a state of epistemic dependence towards the epistemic authorit

When teaching style matches students' epistemic (in)dependence: The moderating effect of perceived epistemic gap

In a 2×2×2 factorial design, 3rd year Romanian psychology students (N=94) were assigned into 2 groups according to the extent to which they acknowledged an epistemic dependence (lowvs. high) toward their professor. They then compared the competence of 3rd year students to that of 1st year or 5th year students. Finally, they were exposed to a persuasive counter-attitudinal message from an epistemic authority, framed in an authoritarian vs. democratic style. The main dependent variable was the influence of the counter-attitudinal message. Results show an interaction between the three variables. No effects were found among students in the upward social comparison condition in which they felt particularly incompetent. The expected interaction between style and dependence was significant in the down ward comparison condition where participants felt more competent than 1st year students. Students high in perceived epistemic dependence were more influenced by the authoritarian style than those low in epistemic dependence. The reverse tended to be true for participants exposed to the democratic styl

Human mesenchymal stromal cells improve scar thickness without enhancing cardiac function in a chronic ischaemic heart failure model

Few data address the role of human mesenchymal stromal cells (MSCs) in the management of chronic ischaemic heart failure. We assessed their effect in immune-deficient animals. MSCs were cultured from bone marrow of human volunteers. Non-obese diabetes severe combined immunodeficiency (NOD/SCID) gamma null mice were randomly assigned to intramyocardial injection of human MSCs or phosphate-buffered saline 4 weeks after induction of acute myocardial infarction (MI). Echocardiography was performed 4 weeks after MI and 1 and 4 weeks after injection. Donor cell chimerism was assessed by DNA for human Alu sequences 2 and 4 weeks after injection. Histological assessment and quantification of neovascularization were determined 4 weeks after treatment. Donor MSCs at frequencies of 0.006 and 0.001% were present 2 and 4 weeks after cell injection, respectively. The infarcted ventricular wall was significantly thicker in the cohort receiving MSCs compared with control mice. There was no difference in fractional shortening, left ventricular dimensions or scar area between the groups. Small vessel density was also similar between the groups. Human MSCs increased the thickness of the infarcted ventricular wall without improving cardiac function in this chronic ischaemic heart failure model. Further studies are required to assess the benefit of MSCs in this setting.Fil: Dayan, Victor. University Health Network; CanadáFil: Yannarelli, Gustavo Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. University Health Network; CanadáFil: Filomeno, Paola. University Health Network; CanadáFil: Keating, Armand. University of Toronto; Canadá. University Health Network; Canad

Deflecting Stereotype Threat Through Downward Comparison: When Comparison with Immigrants Boosts the Performance of Stigmatized Native Students

Two experiments examined the effect of comparison with immigrants on the intellectual performance of stigmatized native students (i.e., women and students from low socioeconomic backgrounds). It was predicted that such a comparison may boost the test performance of both groups of students rather than comparison with their counterparts who are not stigmatized. In line with this hypothesis, we found that female European students (Study 1) performed better on a math test when they were led to compare with a female immigrant rather than with another female European student. Study 2 replicated this finding in regard to the performance of native students with low socioeconomic status on a general intelligence test. Results are discussed in terms of stereotype susceptibility predicaments and their implications for native-immigrant performance gap

L’innovation a-t-elle joué un rôle dans la naissance de l’administrative science ?

International audienceParmi les transformations profondes que connaît le monde industriel à la fin du XIXe siècle, l’introduction des activités de recherche scientifique et les enjeux de l’innovation ont vraisemblablement plus marqué la carrière et la théorie de Fayol qu’on ne l’a jusqu’à présent reconnu. Dans quelle mesure, au-delà du cas de Fayol, l’innovation a-t‑elle joué un rôle dans la naissance des sciences de gestion ou de l’administrative science ? Quelles étaient l’étendue et la réalité des liens entre sciences et industrie au début du XXe siècle ? Et comment se sont organisés – à cette époque – les liens entre le management, devenant une science, et la recherche scientifique plus généralement