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This article argues that the modern American partisan gender gap – the tendency of men to identify more as Republicans and less as Democrats than women – emerged largely because of mass-level ideological party sorting. As the two major US political parties ideologically polarized at the elite level, the public gradually perceived this polarization and better sorted themselves into the parties that matched their policy preferences. Stable pre-existing policy differences between men and women caused this sorting to generate the modern US partisan gender gap. Because education is positively associated with awareness of elite party polarization, the partisan gender gap developed earlier and is consistently larger among those with college degrees. The study finds support for this argument from decades of American National Election Studies data and a new large dataset of decades of pooled individual-level Gallup survey responses.
Nanoporous MgAl2O4 particulates with high porosities were successfully prepared from sol-gel reactions, solvent exchange with castor oil and subsequent combustion and calcination at 700 °C. The products were crystalline and semitransparent. Changes in the metal precursor concentrations allowed control of pore volumes from 0.7 to 1.1 cm3/g and average pore sizes from 14 to 19 nm. The specific surface areas are about 200 m2/g regardless of the precursor concentrations. After heating at 1000 °C for 10 hours, the products kept about 70% of their original pore volume and about 60% of the original surface area. Heating at 1100 °C caused a drastic reduction of pore volume and surface area to 40 and 36%, respectively, as the average particle size increased to 23 nm.
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