6 resultados para Nuclear arms control

em Deakin Research Online - Australia


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South Asia has emerged in the post-Cold War era as a region where ongoing nuclear rivalry has the potential to result in a nuclear exchange between India and Pakistan. The United States, together with the global community, is devoting considerable effort to prevent the further development and deployment of nuclear weapons by India and Pakistan. This thesis analyses the underlying reasons for the ongoing nuclear rivalry between India and Pakistan, details post-Cold War initiatives to end the nuclear rivalry and examines the prospect of United States efforts to cap, reduce and eventually eliminate the nuclear arsenals of India and Pakistan. The thesis finds that historical factors form the basis of the continuing hostility and animosity between the two nations. The two nations have been bitter rivals since the time of partition in 1947 and the disputed territory of Kashmir continues to be the manifestation of deep seated antagonism and hostility. Pakistan's geography leaves it extremely vulnerable to conventional Indian attack and possession of nuclear weapons is seen as a means to redress the imbalance. Strong domestic support together with fervent nationalism and international prestige will continue to drive the nuclear programs of each nation. This thesis concludes that the nuclear rivalry between India and Pakistan is regional in nature and the end of the Cold War has done little to improve the prospects for nuclear disarmament in the region. United States led efforts have failed to persuade India or Pakistan to either accede to the Non-Proliferation Treaty (NPT) or dismantle their nuclear weapons. The thesis also notes that the United States has failed to take account of China as a significant regional power and it's impact on the nuclear programs of India and Pakistan. A fresh approach (to include China) with more emphasis on regional dialogue is suggested as a first step to ending the nuclear rivalry.

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Discusses deterrence theory in relation to the nuclear armed nations. Suggests the world may turn from the deterrence of war using nuclear weapons to deterring countries and other oganisations from their acquisition.

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This volume in the Documents on Australian Foreign Policy series draws on unpublished records from the National Archives of Australia to document the negotiation of the Nuclear Non-Proliferation Treaty (NPT) from an Australian perspective. Commencing with early post-war efforts to control nuclear energy following the dropping of atomic bombs on Hiroshima and Nagasaki, the volumes traces Australia’s changing attitude to the issue of nuclear arms control and disarmament during the Cold War years of the 1950s and 1960s and its ambiguous approach to the acquisition of nuclear weapons in the subsequent negotiation of the NPT. Signed by the Gorton government in 1970 after considerable debate in the policymaking community in Canberra, the treaty was ratified by the Whitlam government in 1973 and has since formed a fundamental plank in Australian attitudes and policies towards international efforts to reduce and eventually eliminate nuclear weapons.

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Glycogen availability can influence glucose transporter 4 (GLUT4) expression in skeletal muscle through unknown mechanisms. The multisubstrate enzyme AMP-activated protein kinase (AMPK) has also been shown to play an important role in the regulation of GLUT4 expression in skeletal muscle. During contraction, AMPK [alpha]2 translocates to the nucleus and the activity of this AMPK isoform is enhanced when skeletal muscle glycogen is low. In this study, we investigated if decreased pre-exercise muscle glycogen levels and increased AMPK [alpha]2 activity reduced the association of AMPK with glycogen and increased AMPK [alpha]2 translocation to the nucleus and GLUT4 mRNA expression following exercise. Seven males performed 60 min of exercise at ~70% [VO.sub.2] peak on 2 occasions: either with normal (control) or low (LG) carbohydrate pre-exercise muscle glycogen content. Muscle samples were obtained by needle biopsy before and after exercise. Low muscle glycogen was associated with elevated AMPK [alpha]2 activity and acetyl-CoA carboxylase [beta] phosphorylation, increased translocation of AMPK [alpha]2 to the nucleus, and increased GLUT4 mRNA. Transfection of primary human myotubes with a constitutively active AMPK adenovirus also stimulated GLUT4 mRNA, providing direct evidence of a role of AMPK in regulating GLUT4 expression. We suggest that increased activation of AMPK [alpha]2 under conditions of low muscle glycogen enhances AMPK [alpha]2 nuclear translocation and increases GLUT4 mRNA expression in response to exercise in human skeletal muscle.

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A traffic control device in the form of a humanoid character robot, doll or dummy is used to warn driver of danger ahead on the road. The device can be used on roads, streets and in other sites where there are moving vehicles. The robotic device informs drivers of impending danger by moving its arms and sounding an acoustic alarm. In this way the robot can simulate a policeman or road flagging operator. The device may also include speed detection and preferably speed indication means. The robot may make decisions based on the detected speed of a vehicle and the limit for the area in operating the arms and sound warning means. The robot may also be equipped with a camera or video. The robot may also be controlled wirelessly.

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We have taken a mutational approach to identify genes important for male fertility in Arabidopsis thaliana and have isolated a number of nuclear male/ sterile mutants in which vegetative growth and female fertility are not altered. Here we describe detailed developmental analyses of four mutants, each of which defines a complementation group and has a distinct developmental end point. All four mutants represent premeiotic developmental lesions. In ms3, tapetum and middle layer hypertrophy result in the degeneration of microsporocytes. In ms4, microspore dyads persist for most of anther development as a result of impaired meiotic division. In ms5, degeneration occurs in all anther cells at an early stage of development. In ms15, both the tapetum and microsporocytes degenerate early in anther development. Each of these mutants had shorter filaments and a greater number of inflorescences than congenic male-fertile plants. The differences in the developmental phenotypes of these mutants, together with the non-allelic nature of the mutations indicate that four different genes important for pollen development, have been identified.