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51.
This study was conducted in an attempt to develop a metallographic method for the investigation of pipe bombings. Three common pipe materials, ASTM A53 steel, AISI 304L stainless steel, and 6061-T6 aluminum, were shock-loaded using five high explosives and three propellants. The explosives used were ANFO, Composition C4, C6 detasheet, nitroglycerine-based dynamite, and flake TNT. The propellants used were FFFFg black powder. Red Dot smokeless powder, and Turbo Fuel A. The post-blast microstructure, hardness, and, in the case of 304L, transformed martensite content were examined for each test. The damage done to the microstructure was found to increase with increasing detonation velocity of the explosives and increase in pressure generated by the shock-metal interaction. Material hardness and, in the case of 304L, martensite content showed a sharp increase followed by a plateau as the shock pressure and detonation velocity increased. 相似文献
52.
53.
This study examined the impact of types of women's verbal refusals, and the timing of her refusal, on men's discrimination of when a female wants her partner to stop making sexual advances. Male students were randomly assigned to 1 of 6 conditions (Explanations × Intimacy Levels). Before listening to an audiotape of a date rape, participants were told they would be listening to an interaction between a man and a woman who had just returned from a date. They were instructed to indicate when the woman wanted the man to stop making sexual advances by pressing a switch that synchronously stopped a timer (yielding the measure of latency). In the vignette, the woman provided an explanation for not engaging in sexual intercourse on the date either during kissing or when the man attempted to touch her breasts. She offered one of three reasons for refusing his sexual advances; fear of pregnancy, waiting until marriage, too early in the relationship. Results revealed an interaction in which participants in the too early in the relationship explanation at the level of breast contact condition displayed significantly longer latencies than individuals in the other groups. The implications of the findings are discussed. 相似文献
54.
The Principle of Full Compensation in Tort Law 总被引:2,自引:2,他引:0
According to the principle of full compensation, tort law seeks to put the victim in the position he was in before the tort. This position is generally considered to be the situation where the victim does not suffer any harm at all. We consider an alternative interpretation. If an injurer takes due care, the victim is faced with expected harm. This can be considered the victim's expected harm in the situation he was in before the tort. Thus conceived full compensation requires a negligent injurer to pay damages which bring the (potential) victim ex ante in the same position as the victim was in the case where the (potential) injurer takes due care. We investigate the consequences of this restated negligence rule. For due care levels larger than efficient care, the standard negligent rule may lead to excessive care, whereas the restated negligent rule always leads to efficient care. Furthermore, the activity level under the restated negligent rule is greater than the activity level under the standard negligent rule, which itself is greater than the efficient activity level. Social welfare under the restated negligence rule can either be higher or lower than social welfare under the standard negligence rule. 相似文献
55.
56.
In a naturalistic study of age segregation during adolescence, 403 adolescents making up 153 separate groups were observed in three high schools and seven out-of-school settings. Age segregation was extensive, especially in school, among older adolescents in same-sex groups of friends. More mixed-age association was observed out of school among younger adolescents who were in mixed-sex groups containing relatives. Adolescents were most often observed with friends who were other adolescents, next with adults, and least frequently observed with children. Parents, particularly fathers, were rarely present. It was suggested that age segregation during adolescence is the result of a lack of contact with relatives.Received his Ph.D. from Michigan State University in 1974. Major research interest is parent-adolescent relations.Major research interests are adolescence and clinical psychology. 相似文献
57.
Darling Nancy Dowdy Bonnie B. Van Horn M. Lee Caldwell Linda L. 《Journal of youth and adolescence》1999,28(4):461-480
This study examines the association of self-perceptions with sixth to eighth graders' exposure to mixed-sex and dating contexts. It contrasts two hypotheses: the stress hypothesis, which suggests that the transition to romantic relationships will be associated with declines in self-esteem, especially for girls, and the leisure hypothesis, which suggests that movement into a desired role in an emotionally positive social context will be associated with positive emotions and higher self-esteem. Results indicate that adolescents experience mixed-sex settings positively, and that comfort with the other sex (for girls) and more time spent with the other sex (for boys) are predictive of more positive self-perceptions. Activity diary data suggest that these differences are due to differences in the emotional climate of same- and mixed-sex settings, rather than to the activities adolescents engage in with same- and mixed-sex groups. Dating boys who are less interested in dating experience lower self-esteem. Results are discussed in light of the transitional nature of mixed-sex relationships in early adolescence and the preparatory role played by same-sex friendships. 相似文献
58.
Managing incidental findings in human subjects research: analysis and recommendations. 总被引:8,自引:8,他引:0
Susan M Wolf Frances P Lawrenz Charles A Nelson Jeffrey P Kahn Mildred K Cho Ellen Wright Clayton Joel G Fletcher Michael K Georgieff Dale Hammerschmidt Kathy Hudson Judy Illes Vivek Kapur Moira A Keane Barbara A Koenig Bonnie S Leroy Elizabeth G McFarland Jordan Paradise Lisa S Parker Sharon F Terry Brian Van Ness Benjamin S Wilfond 《The Journal of law, medicine & ethics》2008,36(2):219-48, 211
No consensus yet exists on how to handle incidental findings (IFs) in human subjects research. Yet empirical studies document IFs in a wide range of research studies, where IFs are findings beyond the aims of the study that are of potential health or reproductive importance to the individual research participant. This paper reports recommendations of a two-year project group funded by NIH to study how to manage IFs in genetic and genomic research, as well as imaging research. We conclude that researchers have an obligation to address the possibility of discovering IFs in their protocol and communications with the IRB, and in their consent forms and communications with research participants. Researchers should establish a pathway for handling IFs and communicate that to the IRB and research participants. We recommend a pathway and categorize IFs into those that must be disclosed to research participants, those that may be disclosed, and those that should not be disclosed. 相似文献
59.
60.
Statement of Purpose: A decline in state-sponsored terrorism has caused many terrorist organizations to resort to criminal
activity as an alternative means of support. This study examines terrorists' involvement in a variety of crimes ranging from
motor vehicle violations, immigration fraud, and manufacturing illegal firearms to counterfeiting, armed bank robbery, and
smuggling weapons of mass destruction. Special attention is given to transnational organized crime. Crimes are analyzed through
the routine activity perspective and social learning theory. These theories draw our attention to the opportunities to commit
crime and the criminal skills necessary to turn opportunity into criminality. Through these lenses, the research appraises
the “successes” and “failures” of terrorists' engagement in crime. Because “failures” can result from law enforcement efforts
to (1) interrupt criminal skill development, and/or (2) remove criminal opportunities via technologies and transportation
systems, the research represents a best practices approach to the study and control of terrorism.
This project was supported by Grant No. 2003-DT-CX-0002 awarded by the National Institute of Justice, Office of Justice Programs,
U.S. Department of Justice. Points of view in this document are those of the author and do not necessarily represent the official
position or policies of the U.S. Department of Justice. 相似文献