Current research in adolescent sexuality has largely focused on vaginal-penile intercourse, with less attention to noncoital
sexual activity. This study examined how maternal factors influence the transition from virginity to noncoital behavior among
White and Asian American youth who have never experienced vaginal intercourse. We conducted logistic regression analyses to
examine whether traditional maternal predictors of coital sex were important in understanding noncoital sexual activity of these two populations. Waves 1 and 2 of the National Longitudinal Study of Adolescent Health were utilized.
For White Americans (n = 3,926), direct and indirect maternal factors were associated with noncoital sexual involvement: maternal support, control,
mother–child communication about sex, and adolescents’ perceptions of maternal approval of sex. In contrast, only maternal
support was associated with the onset of noncoital sexual behavior for Asian Americans (n = 611). The study underscores the need to explore culturally specific factors that may influence Asian American adolescent
noncoital sexual behaviors.
This paper aims to explore various possibilities in the evolving global gas market by constructing game-theoretical models involving the major players: Russia and Qatar exporting gas to the Asia-Pacific and Europe, respectively. We explore a series of hypothetical scenarios based on competitive and collusive settings for the Asia-Pacific LNG market and based on Qatar’s export route to the European gas market. The scenarios that are examined are (1) Russia as the follower and Qatar as the leader in a Stackelberg game; (2) Russia and Qatar as Cournot competitors; (3) collaboration between Russia and Qatar as bilateral monopolies; (4) Qatar exporting gas to European borders; (5) Qatar exporting gas to the last transit country; and (6) Qatar transporting gas to the Turkish border under a multi-pricing scheme. Demand is estimated under each scenario to simulate the respective export volumes, prices and quantities, and profit in each scenario. By exploring these market interactions, we find that it is essential for Russia to strike a deal with Qatar in the Asian market and accelerate their gas production in order to compete as an LNG market leader. Russia is likely to benefit more if it can link with Qatar to act as a monopoly on their segmental demand curve. On the other hand, Qatar’s profit is expected to be higher under the scenario when Qatar sells all the gas to the last transit country as the sole demand point instead of passing through transit countries.
The shedder status of a person is an important consideration when evaluating probabilities of DNA transfer during activity-level assessments. As an extension of our previously published study, the shedder statuses of 38 individuals were reassessed 1 year later. The study found that shedder status may change over time for some individuals and was associated with one's gender, number of items touched, and mobile phone usage. In 29% of touch events, no DNA allele was detected and in 99% of touch events, the amount of DNA deposited was <2 ng. The study also found that in 0.6% of touch events, the participant could be excluded as a contributor of the observed DNA profile, with another person being included. Additionally, our investigations suggest that the current three-category system for shedder status classification may require further refinement to better represent the individuals' shedder status in a population. 相似文献
