H1N1 swine flu What you need to know

        The World Health Organisation has declared the influenza H1N1 "Swine" Flu outbreak as a pandemic.
The term "pandemic" means nothing about the severity of the illness or this particular strain of influenza. It instead relates to how quickly the virus is spreading and how widespread it is.
         The Ministry of Health says the focus of New Zealand's services remains on containment efforts.
However the Ministry says this country will likely see a similar situation as that which is happening in Australia i.e. the numbers of confirmed cases will increase and at some stage there will have community spread.
The health service will be treating the H1N1 virus like all flu, with the difference being that many more people will be affected because the population is not immune to this new virus. While "swine" flu has been mild so far, it will be serious for some people in the community.
          The Ministry of Health advice is that people who have travelled overseas but who are well on their return or arrival do not need to be routinely excluded from school or work on their return.
The Ministry is also not recommending cancelling or postponing overseas travel during the upcoming school holidays which start on July 4.
     Anyone who has recently travelled overseas and is ill with influenza symptoms is advised to phone their GP or Healthline (0800 611 116) for medical advice. Do not turn up at a hospital or medical centre before doing this as you can spread germs to other people.
            Signs and symptoms of influenza include fever, cough, sore throat, stuffy nose, body aches, headache, chills and fatigue. Some people also experience diarrhoea and vomiting.
Hand hygiene is still the single most effective measure in protecting yourself. Wash your hands with soap and water and dry them thoroughly.
        Alcohol-based cleaners are also effective. Avoid touching your eyes, nose or mouth as germs spread this way.
            Practise good cough and sneeze etiquette. This means covering your nose and mouth with a tissue when you cough or sneeze, and disposing of the tissue in a lined rubbish bin with a lid or plastic bag.
Sick people should stay home until they are well, rather than going to school or work. Try to avoid contact with sick people and reduce time spent in crowded settings. If you become sick, stay home for seven days after your symptoms begin or until you have been symptom-free for 24 hours, whichever is longer. This is to keep you from infecting others.
内容概要:本文详细探讨了双馈风力发电机(DFIG)在Simulink环境下的建模方法及其在不同风速条件下的电流与电压波形特征。首先介绍了DFIG的基本原理,即定子直接接入电网,转子通过双向变流器连接电网的特点。接着阐述了Simulink模型的具体搭建步骤,包括风力机模型、传动系统模型、DFIG本体模型和变流器模型的建立。文中强调了变流器控制算法的重要性,特别是在应对风速变化时,通过实时调整转子侧的电压和电流,确保电流和电压波形的良好特性。此外,文章还讨论了模型中的关键技术和挑战,如转子电流环控制策略、低电压穿越性能、直流母线电压脉动等问题,并提供了具体的解决方案和技术细节。最终,通过对故障工况的仿真测试,验证了所建模型的有效性和优越性。 适用人群:从事风力发电研究的技术人员、高校相关专业师生、对电力电子控制系统感兴趣的工程技术人员。 使用场景及目标:适用于希望深入了解DFIG工作原理、掌握Simulink建模技能的研究人员;旨在帮助读者理解DFIG在不同风速条件下的动态响应机制,为优化风力发电系统的控制策略提供理论依据和技术支持。 其他说明:文章不仅提供了详细的理论解释,还附有大量Matlab/Simulink代码片段,便于读者进行实践操作。同时,针对一些常见问题给出了实用的调试技巧,有助于提高仿真的准确性和可靠性。
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