China established a large-scale financial aid system in the late 1980s. This multilayered aid system aimed at enhancing educational and employment opportunities. However, very few studies have examined the impact of student aid on learning effort and outcome, career decisions, and early labor market performance. Using two recent Chinese college student surveys, this study found that students who received financial aid were significantly more likely to take more courses, spend more hours studying outside class, have a higher class ranking, and be less likely to fail a course. Additionally, having financial aid could promote graduate school enrollment and initial employment but had no significant impact on expected salary. Current aid programs for those who receive public financial assistance are thus beneficial in terms of educational outcome and employment perspective.
Atmospheric emissions of gas and particulate matter from a large ocean-going container vessel were sampled as it slowed and switched from high-sulfur to low-sulfur fuel as it transited into regulated coastal waters of California. Reduction in emission factors (EFs) of sulfur dioxide (SO2), particulate matter, particulate sulfate and cloud condensation nuclei were substantial (>= 90%). EFs for particulate organic matter decreased by 70%. Black carbon (BC) EFs were reduced by 41%. When the measured emission reductions, brought about by compliance with the California fuel quality regulation and participation in the vessel speed reduction (VSR) program, are placed in a broader context, warming from reductions in the indirect effect of SO4 would dominate any radiative changes due to the emissions changes. Within regulated waters absolute emission reductions exceed 88% for almost all measured gas and particle phase species. The analysis presented provides direct estimations of the emissions reductions that can be realized by California fuel quality regulation and VSR program, in addition to providing new information relevant to potential health and climate impact of reduced fuel sulfur content, fuel quality and vessel speed reductions.
Improvement of the AlGaN/GaN high-electron mobility transistor's (HEMT's) OFF-state breakdown voltage is achieved by implanting (19)F(+) ions at an energy of 50 keV and dose of 1 x 10(12) cm(-2) under the gate region using BF(3) as the source. The charge state of the implanted fluorine ions changes from positive to negative in the AlGaN/GaN structure because of fluorine's strong electronegativity. The negative-charged fluorine ions at the back side of the two-dimensional electron gas can raise the energy barrier of the GaN buffer layer under the channel, effectively blocking the current injected from the source to the high-field region of the GaN channel when the HEMT is biased at OFF-state. The source-injected electrons, if not blocked, could flow to the high-field region and initiate a premature three-terminal OFF-state breakdown in a conventional AlGaN/GaN HEMT. A 38% improvement of the three-terminal OFF-state breakdown voltage and 40% improvement of the power figure-of-merit V(BD-off)(2)/R(on) are achieved in the enhanced back barrier HEMT.