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Firstly, we consider SIQR epidemical models with continuous and pulse vaccinations; the reproduction numbers have been obtained for those models; by using Dulac function, we prove the global stabilities of equilibrium of SIQR model with continuous vaccination. In the SIQR epidemical models with pulse vaccinations, we have also discussed the existence of the infection-free periodic solution, the global stabilities of the infection-free periodic solutions, and the effectiveness of pulse vaccination and continuous vaccination policies has been compared for the two models.

文中首先考虑具有连续免疫接种和脉冲免疫接种的SIQR传染病模型，分别获得了它们各自的基本再生数；利用Dulac函数方法证明了具有连续免疫接种的SIQR模型无病平衡点的全局渐近稳定性；在脉冲免疫接种下SIQR传染病模型里，讨论了无病周期解的存在性，证明了该周期解的全局渐近稳定性，并且对连续和脉冲接种下的SIQR传染病模型的接种效率进行了比较。

Darren Dunner - Find free articles by expert author Darren Dunner for republishing on your websites, blogs and free offline magazines.

达伦Dunner -找到免费文章作者达伦Dunner专家为重新在您的网站上，博客和免费离线杂志。

Downtown Duty Free: Make sure you shop at Downtown Duty Free for great saving on a range of items including perfume, alcohol, skincare and cigarettes.

市中心免税店：一定要店在市中心免税店购物，可以使您在香水，酒类，护肤品和香烟之类的物品上省一大笔。

Could you free me free duty for half a day?I've got something urgent to handle.

你能不能让我离开工作岗位半天时间，我有一些紧急事情需要处理。

We are delighted that the Free Software Law Center is being setup under Eben Mogeln's excellent guidance. I think this is an important milestone in the maturity of the free software community.

Samba项目的负责人称，"我们很高兴地看到，在Eben Mogeln的卓越领导下自由软件法律事务中心开始建立起来了，我觉得这是自由软件社区得以发展成熟的一个重要里程碑。"

This is a kind of evolutionary elliptic free boundary problems, in which the free boundary changes with time and at each fixed time the unknown function satisfies a boundary value problem for an equation of elliptic type.

详细本文分两部分。第一部分讨论拟定常电加工问题。这是一类发展型的椭圆自由边界问题，其自由边界依赖于时间的变化而不断演化，在每一固定时间，未知函数满足椭圆型方程的边值问题。

Free Cross Stitch Designs - Inspiring the home embroiderer with free designs,...

免费跨缝的设计-激励首页e mbroiderer与免费设计，。

Some sites, such as Term Paper Emporium and Absolutely Free: Online Essays offer course papers for free.

有的网址，如"学期论文大卖场"和"绝对免费：网上论文"，免费提供课程论文。

Test and analysis show that, the distribution patterns of the tangent veloctiy fields in the big cone area and the small cone area, which are comprised of para-free vortex and para-forced vortex, are basically identical without a change of the radius of the boundary surface; with the increase of the angle of the small cone, the para-free vortex area decreases and the para-forced vortex area increases, and the emulsifiability of the fluid drips increases with the increase of velocity gradient; the tangent velocity increases with the increase of inlet flow, and the maximum tangent velocities of both the big cone area and the small cone area are 4.94 times of the inlet flow; and the maximum tangent velocity increases with the increase of the split ratio and with the radius of the boundary surface not changed.

试验分析表明，大锥段和小锥段切向速度分布规律基本相同，均由准自由涡和准强制涡构成，分界面半径rm没有变化；随着小锥角θ的增加，准自由涡区缩小，准强制涡区扩大，速度梯度增加会加大液滴的乳化程度；随入口流量增加，切向速度增大，经拟合得出大锥段和小锥段的最大切向速度均为入口流量的4.94倍；分流比加大，分界面半径基本不变，最大切向速度增加。

Meanwhile the function of antioxidant defense system increased to enhance the ability for clearing free radical and antagonized the damage to organism from free radical. So the activity of GSH-Px and T-AOC enhanced. But the compensative ability was limited and the activity of GSH-Px decreased abruptly and the T-AOC was not increased further in cerebellum of chicken with encephalomalacia. This showed that it existed the exhaustion of GSH-Px in cerebellum of chicken with encephalomalacia.

在体内自由基蓄积的同时，机体抗氧化系统功能出现代偿性增强，提高自由基的清除能力，以对抗自由基对机体的损伤，表现为GSH-Px活性和T-AOC的增强，但机体的代偿能力是有限的，发病雏鸡小脑中GSH-Px活性的突然降低和T-AOC的不再增高，表明GSH-Px在发病雏鸡小脑中存在耗竭现象。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。