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氮肥运筹对机插双季稻产量、氮肥利用率及经济效益的影响 总被引:10,自引:2,他引:8
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基于追踪器的思想讨论了参数不确定的分数阶混沌系统的自适应同步问题.应用两种不同的方法来实现同步.一种方法为构造合适的控制器从而得到和响应系统相同阶的误差系统,进而应用分数阶系统稳定的理论;另一种为构造一个新的响应系统,把分数阶系统转换为整数阶系统,进而利用Lyapunov稳定性理论.选取Chen系统和Qi系统进行数值模拟验证结论的有效性.并与已有的针对不同阶系统同步的Laplace变换方法进行比较. 相似文献
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AIM: To determine the effects of NF-κB on the development of rat pancreatic fibrosis mediated by angiotensin II. METHODS: Spraque-Dawley rats (200-300g) were randomly divided into normal group, control group and losartan-treatment group. Pancreatic fibrosis was induced by injection of 2% TNBS into biliopancreatic duct. Rats in losartan-treatment group and control group were respectively treated with losartan (10 mg·kg-1·d-1) by gavage and the same volume of saline vehicle. The expression, distribution, and activation of NF-κB were studied by Western blot, immunohistochemistry and TransAMTM. Toluidine blue staining and transmission electron microscopy were also used to observe the number, distribution and degranulation of mast cells. In addition, RT-PCR was performed to detect the intrapancreatic ICAM-1 mRNA expression. RESULTS: The expression and activity of intrapancreatic NF-κB p65 protein were significantly increased on day 3 after operation, reaching peak on day 7 [(0.406±0.086)mg/g total protein].. Mast cell activation was observed and ICAM-1 mRNA levels on day 3 and 7 were up-regulated in control group. Losartan treatment inhibited NF-κB expression and activation, reduced mast cell infiltration and degranulation and decreased ICAM-1 mRNA expression compared with control rats. CONCLUSION: It might be associated with the expression and activation of NF-κB that angiotensin II mediates inflammation and fibrosis in the early stage of pancreatic fibrosis. 相似文献
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