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排序方式: 共有403条查询结果,搜索用时 31 毫秒
321.
This is the first report regarding the characterization of the new synthetic cannabinoid 4F‐MDMB‐BINACA. 4F‐MDMB‐BINACA was first analytically confirmed in seized drug material using gas chromatography–mass spectrometry (GC‐MS), liquid chromatography–quadrupole time‐of‐flight mass spectrometry (LC‐QTOF), and nuclear magnetic resonance (NMR) spectroscopy. Subsequent to this characterization, 4F‐MDMB‐BINACA was detected in biological specimens collected as part of forensically relevant casework, including medicolegal death investigations and drug impaired driving investigations, from a variety of regions in the United States. Further analysis of biological specimens resulted in the identification of the metabolites 4F‐MDMB‐BINACA 3,3‐dimethylbutanoic acid and 4‐OH‐MDMB‐BINACA. 4F‐MDMB‐BINACA is appearing with increasing frequency as a contributory factor in deaths, creating morbidity and mortality risks for drug users. Laboratories must be aware of its presence and impact, incorporating 4F‐MDMB‐BINACA into workflows for detection and confirmation.  相似文献   
322.
This study is interested in the impact of Facebook as a source for political information on public opinion during political controversies. In a society where the mainstream media are under heavy influence by the dominant power and yet Internet communication is largely open and free, social media may become particularly important for the transmission of critical information and viewpoints. The social media information environment may exhibit an overall ‘anti-establishment bias.’ However, the impact of social media should vary across individuals depending on the extent and character of user selectivity. Analysis of data collected during the political reform debate in Hong Kong (N?=?3,246) show that reliance on Facebook as an information source relates negatively to support for the government’s reform proposal. But the relationship is strongest for people without a strong political orientation and people who do not name any newspapers as their main information source. General theoretical implications of the findings are discussed.  相似文献   
323.
ABSTRACT

The integrated low self-control/risky lifestyle theoretical framework has proven useful for explaining various types of victimization. Bullying victimization (i.e., verbal, social, or physical attacks), however, may not fit this explanation very well if youths who are bullied do not have to engage in risky behaviors to be singled out by their peers, but could instead be targeted for other reasons (e.g., physical vulnerabilities). In this context, the current paper examines the generality of the low self-control/risky lifestyle model by assessing whether it can effectively explain which youngsters are more likely to be bullied. Using a sample of 1,901 middle school students, the results indicate that, although low self-control significantly predicts whether youths will engage in risky lifestyles (e.g., displaying aggressive attitudes, committing delinquent acts, using illicit substances), participating in such behaviors does not elevate the likelihood of bullying victimization. Instead, the authors’ findings reveal that low self-control directly influences victimization. Further, physical vulnerability is significantly related to being bullied. These findings suggest that the low self-control/risky lifestyle model needs to be revised to accommodate potential age-graded consequences of self-control, and that physical limitations—not “traditional” risky lifestyles—are persistent sources of bullying victimization that should be further evaluated.  相似文献   
324.
ABSTRACT

This article investigates the direct and indirect effects of female education on full-time labour market employment using Guinean demographic and health surveys. It addresses potential endogeneity of female education, unobserved heterogeneity and sample selectivity concerns using the control function model and a non-self-cluster identification strategy. Results show that female education has a diminishing direct effect on full-time employment, with the inverted-U-shaped relationship portraying that women with seven-plus years of schooling are less likely to be regularly employed than their counterparts with less years of schooling. Interacting female education and its square with the corresponding reduced form residuals increase the probability of full-time labour market employment – an indication that female education and unobserved correlates are complementary. Thus, highly educated Guinea women do not increase their full-time market engagements – a pointer of the importance they may be attributing to home-produced goods and services that push them to perhaps prefer flexi-work arrangements such as occasional or seasonal market engagements.  相似文献   
325.
Evidence suggests sanitation development is more effective when women are involved. The purpose of this study was to provide women with an opportunity to share their perspectives and solutions to sanitation in informal settlements. Data were collected through 55 in-depth interviews with women in Mathare Valley informal settlement in Nairobi, Kenya. The most common solution was to build more toilets, but women had a variety of suggestions – including gender-specific solutions. Findings from this study suggest that it is imperative to start addressing women-specific burdens associated with sanitation in informal settlements.  相似文献   
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“Populism exists because institutions are elite‐driven,” but democracies don't work well without elites, says the acclaimed author of The End of History.  相似文献   
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