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Bloodstains at crime scenes are among the most important types of evidence for forensic investigators. They can be used for DNA-profiling for verifying the suspect's identity or for pattern analysis in order to reconstruct the crime. However, until now, using bloodstains to determine the time elapsed since the crime was committed is still not possible. From a criminalistic point of view, an accurate estimation of when the crime was committed enables to verify witnesses' statements, limits the number of suspects and assesses alibis. Despite several attempts and exploration of many technologies during a century, no method has been materialized into forensic practice. This review gives an overview of an extensive search in scientific literature of techniques that address the quest for age determination of bloodstains. We found that most techniques are complementary to each other, in short as well as long term age determination. Techniques are compared concerning their sensitivity for short and long term ageing of bloodstains and concerning their possible applicability to be used on a crime scene. In addition, experimental challenges like substrate variation, interdonor variation and environmental influences are addressed. Comparison of these techniques contributes to our knowledge of the physics and biochemistry in an ageing bloodstain. Further improvement and incorporation of environmental factors are necessary to enable age determination of bloodstains to be acceptable in court.  相似文献   
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Negative physical and psychological long-term consequences of abuse and bullying are well documented. It is reasonable to assume that abuse and bullying early in life also may have an impact on the ability to work and stay economically independent later in life, but such prospective studies are lacking. This study investigates the consequences of exposure to abuse and bullying in junior high school, as measured by receiving long-term social welfare benefits in young adulthood. In addition, it explores the potential protective role of social support. Self-reported data from 13,633 (50.3 % female) junior high school students were linked to registry data on their use of social welfare benefits from the age of 18 and for eight consecutive years. Cox regression analyses were applied to test the relationship between exposure to life adversities and the use of social welfare benefits, and the potential moderating role of social support. The analyses showed that individuals exposed to abuse and bullying had an increased likelihood of receiving social-welfare benefits compared with individuals not exposed to these types of abuse. Exposure to multiple types of abuse led to a higher likelihood of using social welfare benefits compared with single types of abuse and no abuse. The findings on the potential moderating role of social support were mixed, depending on the source of social support. Family support and classmate relationships were protective in reducing the likelihood of the use of social welfare benefits, whereas peer and teachers’ support showed inconsistent patterns. These results are promising in terms of preventing the long-term negative consequences of abuse and bullying.  相似文献   
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This article analyzes the recent changes in naturalization policies in three Nordic countries, Norway, Denmark and Sweden. Considering the homogeneity of the region in terms of culture, social structure and polity, the discrepancy in current citizenship regulation is remarkable. Similar problem definitions have generated diametrical opposite solutions. This is even more striking as the three countries, hailing on perceived ideas of common interests and various experiences of shared rule in different political constellations for the best part of the last 500 years, also cooperated closely in forging their national citizenship legislation from the 1880s up till 1979. The article gives perspective to this novel variation, analyzing the interplay between aims and means in the naturalization policies. Basic questions like citizenship rights, the social and cultural cohesion of the nation state, national ideology and questions of identity will be addressed.  相似文献   
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The neighboring countries of Denmark, Sweden, and Norway represent three very similar societies that differ markedly with respect to naturalization policy. While the general trend of a civic turn has brought about some of Europe’s strictest residence and citizenship requirements in Denmark, it has left the liberal Swedish policy largely untouched and the Norwegian somewhere in between the other two. How might such divergence in otherwise very similar societies be explained? This article investigates the role different conceptions of nationhood have played. It is argued that different conceptions of nationhood have mattered, but that the national differences have less to do with the normative content of nationhood than with how politicians tend to conceive of the integration process that newcomers must commit to in order to develop a strong sense of national belonging.  相似文献   
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