Hugh A. Klein

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The frequency of the 5s 2S(1/2)-4d 2D(5/2) electric quadrupole clock transition in a single, trapped, laser-cooled 88Sr+ ion has been measured by using an optical frequency comb referenced to a cesium fountain primary frequency standard. The frequency of the transition is measured as 444,779,044,095,484.6 (1.5) hertz, with a fractional uncertainty within a(More)
Relying upon a content analysis of one specific type of medium to which young people are exposed beginning at an early age, on a regular basis, and for many years (i.e., animated cartoons), the present study examines what types of messages are provided about being underweight, overweight and normal weight. This research examines the following issues: (1)(More)
Relying upon a content analysis of one specific type of medium to which young people are exposed beginning at an early age, on a regular basis, and for many years (i.e., animated cartoons), the present study examines what types of messages are provided about being physically unattractive, physically attractive, and ordinary-looking. This research concerns(More)
  • Hugh Klein
  • 2009
The present study entailed conducting a content analysis of 1,434 ads/profiles posted on one of the most popular "Men who have Sex with Men" (MSM) websites that specifically fosters unprotected sex. Ads/profiles were selected randomly based on the American ZIP code of residence (n = 1,316), with a randomly-drawn oversampling of profiles of men who(More)
This study examines the role that self-esteem plays in HIV-related risk taking among users of the drug, Ecstasy. The first part of the analysis focuses on the relationship of self-esteem to HIV risk-taking. The second part examines predictors of self-esteem in this population. Conducted between 2002 and 2004, the research is based on a sample of 283 young(More)
Purpose. This study examines the prevalence of alcohol-related problems, the factors underlying these problems, and whether or not there is evidence of syndemic effects in a community population of southern, urban African American women. Methods. Questionnaire-based interviews were conducted with 817 women, all African American, from 80 targeted census(More)
Previous studies have shown a link between mental health functioning and involvement in HIV risk practices. The present research examines how well one specific group of men who have sex with other men (MSM) fare in terms of their mental health functioning, and then focuses on how mental health functioning relates to HIV risk practices in this population.(More)
The purposes of this study are to (1) examine the extent to which young adult Ecstasy users recently reported having had multiple sex partners and (2) identify the factors predictive of engaging in this behavior. Potential predictors included demographic characteristics, background and experiences measures, childhood maltreatment experiences, substance use(More)
Despite 50+ years of public health efforts to reduce smoking rates in the United States, approximately one-fifth of the adults living in this country continue to smoke cigarettes. Previous studies have examined smokers' risk perceptions of cigarette smoking, as well as the perceived benefits of quitting smoking. Less research has focused on the perceived(More)