Results 31 to 40 of about 1,247,431 (166)
, 1994 砂土的非相关塑性流动可能导致介质本身的失稳和问题解的非唯一性。然而;无论是Ｄｒｕｃｋｅｒ或Ｈｉｌｌ的假设;都只能给出介质稳定的充分条件。本文首先分析饱和砂土的非相关流动特性;利用局部屈服面和局部塑性势面的概念;分析得出饱和砂土稳定的充分必要条件；然后给出不稳定区域在应力空间的具体位置。文中提出的“不稳定线”与“崩塌面”相一致 ...
韦昌富, 江礼茂, 章根德
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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
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Zhejiang Daxue xuebao. Lixue ban, 2014 过去的半个多世纪，传染病模型在数学生态学领域已受广泛重视.研究了一个具时滞和扩散的传染病模型，重点讨论了该模型解的定性性质和稳态解的渐近行为；利用线性化和特征值方法讨论了正稳态解的局部稳定性，通过构造单调迭代序列，给出了正稳态解的全局稳定性.最后给出了数值模拟和讨论，当接触率充分小时，问题的无病平衡点是全局渐近稳定的.
XIALibiao(夏立标)
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT This study developed a metal–modified fluoroethylene vinyl ether (FEVE) organic coating on 6061 aluminum alloy, supported by a micro‐arc oxidation (MAO) pretreatment layer, to enhance corrosion resistance and antifouling performance in marine environments.
Chang Liu +5 more
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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
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Shuitu Baochi Xuebao, 2021 以汉江与嘉陵江源区黄土母质上发育的土壤为研究对象，通过对土壤团聚体和理化性质的试验分析和数据解析，研究了两地土壤团聚体的分布规律及发生机制。结果表明：（1）汉江源区（LJH）团聚体的R0.25、MWD、GMD值由A层的83.73%，2.17和1.11分别降为C层的59.18%，0.40和0.26，嘉陵江源区（YJS）由A层的69.72%，1.03和0.46降为C层的56.55%，0.52和0.27，分形维数（D）则随土层深度的加深而增大，即前者的D值由A层的2.46增为C层的2.53，后者由A层的2 ...
刘艳玲 +5 more
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Rare Metals, Volume 45, Issue 7, July 2026.ABSTRACT In electrocatalysis, traditional single‐atom catalysts (SACs) face challenges in achieving coordinated control of reaction pathways due to limitations such as single local energy levels and carrier recombination. By introducing an additional defect structure, it is possible to break the electronic structure symmetry, thereby activating SACs ...
Juanjuan Huo +8 more
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Journal of Animal Ecology, Volume 95, Issue 7, Page 1178-1193, July 2026.This population‐comparative study reveals that male and female parents respond differently to social and ecological conditions. This sex‐specific responsive strategy is related to the incongruent parental care systems across populations in Chinese penduline tits.
Jia Zheng +5 more
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Methods in Ecology and Evolution, Volume 17, Issue 7, Page 2123-2134, July 2026.Abstract Elliptic Fourier analysis (EFA) is often employed in geometric morphometrics (GM), but the normalization of elliptic Fourier descriptor (EFD) has persistently posed challenges for obtaining unique and comparable results, especially in the application of outline‐based GM methods, which limits the implementation in automated analysis of numerous,
Hui Wu +6 more
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四川大学学报. 自然科学版, 2015 对H>1/2且随机积分为前向积分的分数阶布朗运动驱动的随机微分方程,为改善显式Euler格式和Milstein格式的稳定性,基于修正隐式技术构造了修正隐式Euler格式和Milstein格式,证明了修正隐式格式较显式格式有更大的稳定步长集,且在一定条件下修正隐式Euler格式是A稳定的.数值模拟显示,步长在稳定步长集内时数值格式稳定,步长在稳定步长集边界附近时误差几乎不改变,而步长在稳定步长集外时数值格式极度不稳定,从而验证了修正隐式格式在保持数值稳定性上的优越性和稳定步长集的合理性.
王维滨, 罗懋康
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