共查询到15条相似文献,搜索用时 78 毫秒
1.
2.
3.
在文献[1][2][3]和[4]的基础上,研究人口问题中具广义Ginzbur-Landau型弥散方程(0.21),(0.22)及更一般的非线性高阶抛物型方程(0.23)初边值问题,在古典解存在且唯一的条件下,利用文[7,8]的相应方法,深入探讨问题的广义解和古典解的渐近性及Blow-up现象,得到许多新结果。 相似文献
4.
本文利用微分不等式技巧研究了某一类Volterra型二阶积分微分差分方程非线性边值问题,在上下解存在的条件下,得到了解的存在性和唯一性定理.结果表明:这种技巧为其它边值问题的研究提出了崭新的思路. 相似文献
5.
给出了一类人口问题中3维的Ginzbur-Landau模型方程初值问题解的熄灭现象的充分必要条件。 相似文献
6.
7.
带存放率的周期竞争扩散系统的稳定共存 总被引:1,自引:0,他引:1
应用上、下解方法和抛物型方程的极值原理,研究了带存放率的周期竞争系统ut-D1Δu=u(α-bu-cv)+h,vt-D2Δv=v)d-eu-fv)+k 在齐次Neumann边界条件下解的渐近性态,得到了该系统的全局渐近性. 相似文献
8.
单种群生长的广义Logistic模型中参数的一种估值方法 总被引:2,自引:1,他引:2
本文提出种群生长的实测数据与广义Logistic模型的相容性条件,给出估计环境容纳量K的数学方法,利用常微分方程反问题的处理方法与麦夸特方法,对模型中参数进行近似估计与优化估计,其方法简便、通用性强. 相似文献
9.
分数阶微分方程在生物科学和其他领域发挥着重要作用.考虑来类分数阶微分方程边值问题正解的这来性,得到的结证不仅可以保证正解的存在这来,而且可以用于构造迭代序列来逼近这个解. 相似文献
10.
11.
利用Leray-Schauder不动点理论研究了一类二阶脉冲微分方程三点边值问题,将以往所研究的方程的边界条件和脉冲项做了推广,得到了其解的存在性的新结果,最后通过实例说明了结论的应用. 相似文献
12.
13.
The two-tank accelerator/aerator modification of activated sludge significantly increases the biodegradation of hydrocarbons
requiring initial monooxygenation reactions, such as phenol and 2,4-dichlorophenol (DCP). The small accelerator tank has a
controlled low dissolved oxygen (DO) concentration that can enrich the biomass in NADH + H+. It also has a very high specific growth rate (μacc) that up-regulates the biomass’s content of the monooxygenase enzyme. Here, we develop and test the ACCEL model, which quantifies
all key phenomena taking place when the accelerator/aerator system is used to enhance biodegradation of hydrocarbons requiring
initial monooxygenations. Monooxygenation kinetics follow a multiplicative relationship in which the organic substrates (phenol
or DCP) and DO have separate Monod terms, while the biomass’s content of NADH + H+ has a first-order term. The monooxygenase enzyme has different affinities (K values) for phenol and DCP. The biomass’s NADH + H+ content is based on a proportioning of NAD(H) according to the relative rates of NADH + H+ sources and sinks. Biomass synthesis occurs simultaneously through utilization of acetate, phenol, and DCP, but each has
its own true yield. The ACCEL model accurately simulates all trends for one-tank and two-tank experiments in which acetate,
phenol, and DCP are biodegraded together. In particular, DCP removal is affected most by DOacc and the retention-time ratio, Θacc/Θtotal. Adding an accelerator tank dramatically increases DCP removal, and the best DCP removal occurs for 0.2 < DOacc < 0.5 mg/l and 0.08 < Θacc/Θtotal < 0.2. The rates of phenol and DCP utilization follow the multiplicative relationship with a maximum specific rate coefficient
proportional to μacc. Finally, μacc increases rapidly for Θacc/Θtotal < 0.25, acetate removal in the accelerator fuels the high μacc, and the biomass’s NADH + H+ content increases very dramatically for DOacc < 0.25 mg/l. 相似文献
14.