1,721,047 research outputs found
THERMAL-SHOCK RESISTANCE OF CORDIERITIC FILTER FOR DIESEL-ENGINES
No full textCordierite porous ceramics are attractive materials for diesel particulate traps, but are sensitive to the thermal shocks provoked by the ignition of accumulated soot. The present paper reports an investigation on a commercial porous cordierite to be used as a substrate for catalysts in exhaust pipes. Samples have been subjected to thermal shock tests to study the response of these ceramics to the repetitive thermal shock that occurs within automotive systems during the regeneration processes. In particular the effect of thermal treatment on microstructure and mechanical propel ties has been examined and explained
Piezospectroscopic analysis of the residual stresses in the strontium hexaluminate/zirconia (SrAl12O19/ZrO2) system
No full textSamples of strontium hexaluminate (SrAl12O19), both pure and mixed with different amounts of ceria-stabilized zirconia (CE-TZP), have been prepared via a chemical route. The fluorescence spectrum of SrAl12O19 is similar to that of ruby and yttrium aluminium garnet (YAG); consequently, this similarity has been attributed to the presence of a trace impurity of Cr3+ ions. The most-intense fluorescence peak of SrAl12O19 exhibits a dependence on stress that is given by the average uniaxial piezospectroscopic coefficient ( = 1.5 cm(-1).GPa(-1)). The piezospectroscopic coefficient has been used to convert to stress the fluorescence frequency shift of SrAl12O19 mixed with zirconia (ZrO2). The stress, as a function of the volume fraction of ZrO2, resides between the Hashin-Shtrikman bounds but is best reproduced by an effective medium approximation
Rituximab in the treatment of immune thrombocytopenia: What is the role of this agent in 2019?
Full text linkThe use of rituximab for the treatment of immune thrombocytopenia was greeted enthusiastically: it led to up to 60% response rates, making it, nearly 20 years ago, the main alternative to splenectomy, with far fewer side effects. However, long-term follow-up data showed that only 20-30% of patients maintained the remission. No significant changes have been registered using different dose schedules and timing of administration, while the combination with other drugs seemed promising. Higher response rates have been observed in young women before the chronic phase, but apart from that, other clinical factors or biomarkers predictive of response are still lacking. In this review we examine the historical and current role of rituximab in the management of immune thrombocytopenia, 20 years after its first use for the treatment of autoimmune diseases
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
- …
