Using hazard model estimates, the paper finds strong empirical evidence that activism by black civil rights groups was complemented by legislative support from Jewish groups and from organized labor.

New planes with the proper sheathing shouldn't experience many problems, but Carson claims that phones are a genuine safety hazard on older model air crafts.

Fuzzy integrated assessing theory was used in hard rock mine goaf for the first time and multifactor assessing model for goaf hazard degree was also constituted.