Results 1 to 10 of about 11,809 (167)

Integrated assessment of soil cutting slope stability using fuzzy mathematics and numerical simulation [PDF]

open access: yes, 2023
The complexity and uncertainty of the factors affecting the stability of artificial slope in loess regions pose challenges for achieving objective and accurate assessments through a single method. To investigate the stability of the artificial soil slope
Chongjing WANG, Guowei LIU, Long ZHANG
core   +1 more source

Stabilizers in BCK-algebras(BCK-代数的稳定化子)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2023
引入了BCK-代数的稳定化子概念,给出了其相关性质,重点研究了左稳定化子与正则理想之间的关系。进一步,引入了BCK-代数的相对稳定化子概念,讨论了相对稳定化子与正则理想、固执理想及布尔理想之间的关系。借助左相对稳定化子,证明了BCK-代数的所有理想之集构成一个相对伪补格。
程晓云(CHENG Xiaoyun)   +3 more
doaj   +1 more source

Causes and stability analysis of the landslide at Tianbao Reservoir in Jingning County, Gansu Province [PDF]

open access: yes, 2023
On September 18, 2020, a landslide occurred on the left bank of Tianbao Reservoir in Tianbao Village, Sihe Town, Jingning County, Pingliang City, Gansu Province.
Guoying LI   +4 more
core   +1 more source

Hopf bifurcation of a food chain model with cooperative hunting(具有合作狩猎的食物链模型的Hopf分支)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2023
为研究捕食者间合作行为对食物链系统动力学行为的影响,在原有合作捕食模型基础上引入顶层捕食者(仅以捕食者种群为食),建立了具有合作狩猎的食物链模型。运用线性化方法讨论了平衡点的局部稳定性,并通过构造合适的Lyapunov函数,给出了系统全局稳定的充分条件。利用中心流形约简定理导出了分支周期解稳定性的显式公式,并通过数值模拟验证了理论分析结果。结果显示,当捕食者间无合作时,正平衡点为稳定焦点,随着合作捕食参数α的增大,系统出现稳定的极限环且随α的增大不断胀大。说明如果捕食者种群密度过大 ...
韩婉琴(HAN Wanqin)   +2 more
doaj   +1 more source

Influence characteristics of regional micrometeorology on macroscopic scale of external dump [PDF]

open access: yes, 2023
To study the relationship of external dump of opencast coal mine impacting on surrounding micrometeorological factors, and then provide the foundation acknowledge for the ecological restoration in mining area, the airflow movement and water distribution ...
Chendong LIU   +7 more
core   +1 more source

Characteristics and causes analysis of Nandianzi landslide in Lingtai County, Gansu Province [PDF]

open access: yes, 2023
On October 3, 2021, a large landslide occurred at the loess-mudstone interface in Nandianzi, Lingtai, its successful early warning measures preventing casualties.
Chaodong WAN   +7 more
core   +1 more source

部分包裹钢-混凝土组合轴压柱整体稳定性能及设计方法

open access: yesJianzhu Gangjiegou Jinzhan, 2023
为研究部分包裹钢-混凝土组合轴压柱的整体稳定性能与设计方法,完成了两个试件的试验。利用有限元软件ABAQUS建立部分包裹钢-混凝土组合柱数值分析模型,并对比试验数据校核模型准确性。利用该数值模型进行参数分析,考虑材料强度、组合柱长细比、含钢率、纵筋和系杆的布置对该类轴压构件整体稳定性能的影响,分别获得不同因素影响下构件绕强轴和绕弱轴的极限承载力。结果表明,材料强度、系杆间距及含钢率对稳定性能的影响均较为显著,纵筋对轴压稳定性能的影响可以忽略。基于数值模拟结果,按照不同含钢率进行归类分析 ...
兰寒枫   +5 more
doaj  

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)

open access: yesZhejiang 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

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)

open access: yesZhejiang 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

植物根系吸水对非饱和土边坡稳定性影响的分析

open access: yesShuitu Baochi Xuebao, 2022
为了量化植物根系吸水对非饱和土边坡稳定性的影响及为植被护坡的植物种类选择提供参考,采用COMSOL Multiphysics建立二维边坡,模拟不同根系形态、根长及降雨条件下的根系吸水引起的非饱和土边坡孔隙水压力的分布变化,并采用极限平衡理论对边坡稳定系数进行定量计算。结果表明:指数形根系吸水产生的吸力最大,比裸坡增大4.2倍,抛物线形根系吸水产生的吸力最小,但仍比裸坡增大2.7倍;根系越长吸水影响深度越大;根系越短,产生的吸力越大,且吸力在边坡表面的变化越显著;短期降雨后,含根系边坡吸力比裸坡高12 ...
钟彩尹   +4 more
doaj  

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