Plasma densities produced by halfand full-wavelength (HW and FW) helical antennae in helicon discharges are compared. It is found that HW antennae are more efficient than FW ones in producing plasma downstream from the antenna. The measured wave amplitudes and the apparent importance of downstream ionization do not agree with computations.

Sports hold a special place in the hearts of many Americans. Indeed, athletic competition has come to define and shape our understanding in many ways of what it means to be American. There is, however, a dark side to sports and that is the racial tension that often consumes our understanding of athletic competition and the equality of athletic prowess and personal ability. Seemingly innocuous, ...

Genes of the major histocompatibility complex (MHC) play a critical role in immune recognition, and many alleles confer susceptibility to infectious and autoimmune diseases. How these deleterious alleles persist in populations is controversial. One hypothesis postulates that MHC heterozygote superiority emerges over multiple infections because MHC-mediated resistance is generally dominant and m...

Two facts motivate this study. (1) The United States is the world’s most productive economy. (2) The US is the destination for a broad range of net factor inflows: unskilled labor, skilled labor, and capital. Indeed, these two facts may be strongly related: All factors seek to enter the US because of the US technological superiority. The literature on international factor flows rarely links the...

Two studies used a thought-listing technique to examine perceived superiority, or the inclination to regard one's own relationship as better than (and not as bad as) others' relationships. Consistent with the claim that this is a motivated phenomenon—and motivated in part by strong commitment—Study 1 revealed that (a) tendencies toward perceived superiority and (b) the commitment-superiority li...

The anger superiority effect shows that an angry face is detected more efficiently than a happy face. However, it is still controversial whether attentional allocation to angry faces is a bottom-up process or not. We investigated whether the anger superiority effect is influenced by top-down control, especially working memory (WM). Participants remembered a colour and then searched for differen...