Description:
A nonlinear differential equation with delay serving as a mathematical model of several applied problmes is considered. Sufficient conditions for the global asymptotic stability and for the existence of periodic solutions are given. Two particular applications are treated in detail. The first one is a blood cell production model by Mackey, for which new periodicity criteria are derived. The second application is a modified economic model with delay due to Ramsay. An optimization problem for a maximal consumption is stated and solved for the latter.
Description:
A nonlinear differential equation with delay serving as a mathematical model of several applied problmes is considered. Sufficient conditions for the global asymptotic stability and for the existence of periodic solutions are given. Two particular applications are treated in detail. The first one is a blood cell production model by Mackey, for which new periodicity criteria are derived. The second application is a modified economic model with delay due to Ramsay. An optimization problem for a maximal consumption is stated and solved for the latter.
Description:
China has one of the most powerful military forces in the world. However, a little over 100 years ago, the Chinese military was repeatedly defeated by Western colonial powers and Japan. These defeats motivated the Chinese to make dramatic changes to their military forces.
Description:
China has one of the most powerful military forces in the world. However, a little over 100 years ago, the Chinese military was repeatedly defeated by Western colonial powers and Japan. These defeats motivated the Chinese to make dramatic changes to their military forces.
Description:
Here we argue that haptics (touch and kinaesthesis) can play a key role in the development of a bionic eye. Tactile displays can supplement and complement the incomplete information that a visual prosthetic will offer the brain in early stages of the prosthetic’s development. Kinaesthetic inputs give the brain feedback about motor activities that correlate with both visual and tactile inputs, and are critical for perceptual competency. Haptic inputs can also help “teach” the new visual sense to respond to stimuli that are initially indiscriminable and enable cross-calibration of inputs to strengthen multimodal cortical connections. By using haptics to supplement and complement inputs from a visual prosthetic, a bionic eye can develop more quickly than did the Bionic Ear.
Description:
OBJECTIVES: In this study, the incidence of head, neck and facial injuries in youth rugby was determined, and the associated risk factors were assessed. DESIGN: Data were extracted from a cluster randomised controlled trial of headgear with the football teams as the unit of randomisation. No effect was observed for headgear use on injury rates, and the data were pooled. SETTING: General school and club-based community competitive youth rugby in the 2002 and 2003 seasons. PARTICIPANTS: Young male rugby union football players participating in under-13, under 15, under 18 and under 21 years competitions. Eighty-two teams participated in year 1 and 87 in year 2. MAIN OUTCOME MEASURES: Injury rates for all body regions combined, head, neck and face calculated for game and missed game injuries. RESULTS: 554 head, face and neck injuries were recorded within a total of 28 902 h of rugby game exposure. Level of play and player position were related to injury risk. Younger players had the lowest rates of injury; forwards, especially the front row had the highest rate of neck injury; and inside backs had the highest rate of injuries causing the player to miss a game. Contact events, including the scrum and tackle, were the main events leading to injury. CONCLUSION: Injury prevention must focus on the tackle and scrum elements of a youth rugby game.
Description:
Book Review- Herbert Vere Evatt, The Tolpuddle Martyrs: Injustice within the Law, Sydney University Press, Sydney, 2009 (first published 1937). pp. xxi + 104. $25.00 paper Herb 'Doc' Evatt, is perhaps best known for his role in forging the United Nations, defending the Communist Party in the High Court, and for his failure to win office during his term as Labor leader (1951-60). The extent of Evatt's legal and historical scholarship is often overlooked. This new edition of his 1937 book, The Tolpuddle Martyrs, is a timely reminder of the brilliant and energetic intellect behind Evatt's more public activities. In 1834, in the midst of concerns over the rising tide of trade union and reform activity, six labourers from Dorset were charged under the 1797 Illegal Oaths Act and sentenced to seven years transportation to the Australian colonies.
Description:
Objective Using issues in rural and remote area nursing as the example, this paper explores how nurses can use their historical imagination in considering professional issues today. Setting Rural and remote area nursing. Primary argument Historical imagination is the creative capacity to imagine possibilities of engaging with the past. Historical imagination in nursing has the potential to help nurses address current professional issues. Points of familiarity with the past can show nurses which issues are enduring and which are transient. A sense of familiarity can bring strength, encouragement and comfort. Points of difference can show nurses that problems are not necessarily permanent or can be dealt with differently. This paper uses aspects of the history of bush nursing in Australia to illustrate how nurses in rural and remote area nursing today could use their historical imagination in addressing current issues. It explores points of familiarity and difference between issues faced by bush nurses in the past and current issues in the international literature. Ways of using historical imagination in rural and remote area nursing recruitment are considered to illustrate the process. Conclusions As the example of engaging with the history of bush nursing in Australia attempts to demonstrate, nurses can use their historical imagination to identify points of familiarity and difference with the past to prompt a shift in thinking and strengthen creativity in addressing current issues
Description:
This paper discusses research within the framework of an Aboriginal way of being and an Aboriginal cultural perception or way of seeing. This particular ontological approach to research arises from a reality that is metaphysical in nature, an Aboriginal phenomenology that possibly challenges western academic models of research methods and guidelines. Respect is at the heart of this research practice and ancestral knowledge and Indigenous law all form part of the way research needs to be enacted. As well as the centrality of ordinary (mundane) knowing, knowledge is deeply spiritual, guiding life-ways and research rationale. Life and nature are sacred, kinship claims link to specific kinds of awareness related to Country and Traditional people belonging to Country. Behaving carefully and appropriately (ethically) are part of the cultural practice of this kind of research and ensure health and well-being for people and Country.