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This paper describes the most common presently used methods for detecting uranium and plutonium isotopes after their introduction to environment. Known isotope ratios of U and Pu in different nuclear events are important tool for characterizing the sources of nuclear material. Detection techniques both in field and in laboratory are presented, as well as different models that can be used for identifying the origin and age of the nuclear material. Identification of the source of nuclear material in environmental samples is needed for estimating the quality and quantity of the nuclear hazard. This information is essential in risk assessment and crisis management, in chemical, biological, radiological and nuclear (CBRN) research after e.g. a terrorist attack, in radioecology and environmental radioactivity research.  相似文献   
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This article examines two related issues: the policy objectives pursued by the British government to prevent India from developing nuclear weapons and the challenges presented to the Indian government in balancing Gandhian idealism with the reality of nuclear diplomacy. Building on recent research, the following issues are explored: the implementation of Anglo-American non-proliferation policy in Asia, the provision of security guarantees for India and Pakistan and the UK proposal to establish a Commonwealth Nuclear force as a means of maintaining British influence in the region. The analysis is placed within the context of Britain's overall defence policy during the 1960s focusing particularly on the British withdrawal from East of Suez and the development of nuclear-sharing arrangements within NATO. The article argues that the Wilson government regarded security guarantees for India as an obstacle towards the successful conclusion of a non-proliferation agreement. Britain's primary objective in advancing the concept of a Commonwealth Nuclear Force was not to increase Indian security in the face of Chinese nuclear threats but to explore possible options to internationalise Britain's nuclear forces after initial plans for a NATO nuclear force had failed.  相似文献   
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The March 2012 coup in Mali opened the door to expanded territorial occupation in northern Mali by Tuareg separatists and subsequently armed Islamist extremists. French forces intervened at the behest of the interim government in Mali. This article examines how various actors frame the conflict to their advantage. While the Malian government and France are allies, the position of various Tuareg actors shift over time as they strategize and weigh the value of allegiance with the French. Local extremist organizations are labeled as terrorists and are targeted as enemies. This article argues that the conflict has been decontextualized and framed within the ‘war on terror’. France’s decision to intervene and to expand their regional military presence, rather than exit, is legitimized by the framing of their intervention as integral to counterterrorism efforts.  相似文献   
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