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Stability criteria for a class of nonlinear singular systems with interval time-varying delays(一类区间时变时滞非线性广义系统的稳定性准则)

Zhejiang Daxue xuebao. Lixue ban, 2013
研究了一类区间时变时滞非线性广义系统的稳定性问题.基于Lyapunov稳定性理论，应用线性矩阵不等式和自由权矩阵方法，给出了使得系统正则、无脉冲且一致渐近稳定的时滞相关型稳定性新准则.结果表明，所给准则可有效判定区间时变时滞非线性广义系统的稳定性，它比已有的一些结果具有更小的保守性，并且通过数值实例进行了验证.
JIAOJian-min(焦建民)
doaj +1 more source

Some characterizations for the uniform exponential stability of linear skew-product semiflows(线性斜积半流的一致指数稳定性的若干刻画)

Zhejiang Daxue xuebao. Lixue ban, 2018
基于线性斜积半流的定义，引入了 Banach空间中该类动力系统一致指数稳定的概念.借助稳定性理论中的Datko型方法，讨论了斜积半流一致指数稳定的特征，建立了其一致指数稳定的若干充要条件.所得结论推广了指数稳定性及指数不稳定性中一些已有的经典结论（如DATKO、ROLEWICZ、MEGAN、BUSE等）.
YUETian(岳田), SONGXiaoqiu(宋晓秋)
doaj +1 more source

过硼酸钠制备的稳定性二氧化氯存在形态的研究

Gongye shui chuli, 2004
以过硼酸钠为稳定剂制备稳定性二氧化氯溶液(稳定液)。通过对稳定液性质的测定、溶液稳定性试验、纸色谱分析和红外光谱分析,以及在与以过碳酸钠为稳定剂的稳定液作对比分析的基础上,结合配位化学理论,提出在以过硼酸钠为稳定剂的稳定性二氧化氯溶液中ClO2是以活性配位化合物的形式存在,并推测了其可能的分子结构。
贺启环, 潘慧云, 谢慧芳
doaj +2 more sources

循环水中锌离子稳定性的研究

Gongye shui chuli, 2004
研究了循环水中锌离子的稳定性，讨论了磺酸盐共聚物和水质因素对锌离子稳定性的影响。结果表明，随着磺酸盐共聚物ZF322浓度的增大，循环水中锌离子的稳定性增强;三价铁离子、钙离子浓度和碱度的增加都会降低锌离子的稳定性;正磷在低浓度时可增强其稳定性;pH值对锌离子稳定性影响很大，但加入药剂后影响比较小。
秦会敏 +5 more
doaj +2 more sources

Criteria for the existence of nonuniform exponential instability of skew-evolution semiflows in Banach spaces(巴拿赫空间上斜演化半流的非一致指数不稳定性的存在条件)

Zhejiang Daxue xuebao. Lixue ban, 2016
基于一致指数不稳定的定义，引入了 Banach空间中斜演化半流非一致指数不稳定的概念，并用实例阐释了二者的关系.借助于指数稳定性的研究方法，讨论了斜演化半流非一致指数不稳定的特征，建立了其非一致指数不稳定的2个充要条件.所得结论推广了指数稳定性及一致指数不稳定性中的一些已有结果.
YUETian(岳田), SONGXiaoqiu(宋晓秋)
doaj +1 more source

Context‐Dependent Effects of Beavers (Castor spp.) on Freshwater Pearl Mussels (Margaritifera margaritifera) in European Rivers 河狸对欧洲河流中的淡水珍珠贝 (Margaritifera margaritifera) 存在情境依赖性影响

Wildlife Letters, EarlyView.
The study explores how beavers (Castor spp.) affect endangered freshwater pearl mussels (Margaritifera margaritifera) in European rivers. Beaver dams can harm small, fragmented mussel populations by reducing flow, increasing sediment, and potentially limiting host fish movement, while larger populations may benefit from improved bed stability and ...
Louise Lavictoire, Ian Convery, Ben Strachan +2 more
wiley +1 more source

Study on the stability and species distribution of inorganic polymer flocculant-polyferric chloride by basification(碱化法制备聚合氯化铁絮凝剂的稳定性和形态分布研究)

Zhejiang Daxue xuebao. Lixue ban, 2003
采用碱化法制备高浓度聚合氯化铁工艺得到了不同碱化剂和稳定剂的不同加入时间对形态分布的影响,以及碱化剂加入速度和碱化度对稳定性的影响.研究结果表明:作为碱化剂,NaHCO3优于NaOH;先加入稳定剂的制备方法对提高PFC的稳定性及混凝特性有利;在碱化度B=0.4时制备的PFC稳定性最差.
WANGHong-yu(王红宇) +3 more
doaj +1 more source

Assessing the Influence of Interference Competition on Ecologically Similar Species Threatened by Habitat Loss 评估干扰性竞争对受栖息地丧失威胁的生态相似物种的影响

Wildlife Letters, EarlyView.
We staged dyadic interaction trials between two kangaroo rat species threatened by habitat loss to test whether one species dominates in direct interactions in the field. We found that Stephens’ kangaroo rat (Dipodomys stephensi) residents and intruders were dominant over Dulzura kangaroo rat (Dipodomys simulans). These results suggest that D. simulans
Janine N. Straughan, Gregory F. Grether, Debra M. Shier +2 more
wiley +1 more source

The oxygen uptake capacity of freshwater fish evolves to favour hypoxia tolerance in lentic species but locomotion capacity in lotic species

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Oxygen supply capacity (α) is a physiological trait hypothesized to shape the metabolic niche and biogeography of aquatic breathers, yet how natural selection targets α remains unclear.
Na Zhang +6 more
wiley +1 more source

稳定性二氧化氯的热稳定性及活化效果研究

Gongye shui chuli, 2004
对稳定性二氧化氯(ClO2)的热稳定性及酸度对活化效果的影响进行了研究,并与亚氯酸盐(NaClO2)水溶液进行了对比;对稳定性ClO2活化后对细菌和乙肝表面抗原HBsAg的灭活效果进行了研究。结果表明:稳定性ClO2水溶液不同于NaClO2水溶液,其热稳定性好于NaClO2,盐酸的活化效果好于柠檬酸。
王丽
doaj +2 more sources

二氧化氯
稳定性二氧化氯