Results 11 to 20 of about 2,365,030 (141)
, 2009 提出了一种自适应的集团算法:如果误差值达到细化准则的要求,就在原子集团中引入新的结点来改变集团的大小,从而使应变梯度较大区域的计算误差减小 ...
汪海英 +4 more
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, 2005 借助CDEM(continuous-baseddiscreteelementmethod)数值计算方法,数值模拟了边坡地应力模型试验。模拟边坡地应力模型试验结果表明:边坡某点的深度对地应力影响较大,随着深度的增加相应点处的竖向地应力偏离理论值越多。到了一定深度以后,这种影响明显减小。边坡角对地应力也有一定的影响,随着坡角的加大、某深度处的竖向地应力偏离理论值越厉害 ...
张俊红, 练振中
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, 2007 基于Biot多孔介质波动理论和Cauchy初应力分析结果给出横观各向同性介质初应力存在的本构方程。利用位移标量势函数得到介质中膨胀波传播的四个波速。通过数值计算研究初应力和孔隙压力存在对膨胀波传播特性的影响 ...
李世海, 马维
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Conservation Biology, EarlyView.Abstract Modeling species distributions in dynamic pelagic environments remains challenging, particularly for wide‐ranging and highly mobile species when there is limited guidance on model performance. This limitation constrains the effective use of species distribution models (SDMs) in marine conservation, where robust and transferable predictions are
E. Pasanisi +32 more
wiley +1 more source
, 2009 通过统一的计算流体力学(CFD)与颗粒离散元(DEM)相结合的方法对典型风沙流场中近沙床的颗粒运动进行了二维数值模拟。气相湍流采用了K-E模型，颗粒的碰撞采用了软球模型。对计算结果的统计发现，颗粒的碰撞仅存在于沙床上方7mm以下，但是4$\sim$7mm为过渡层，颗粒穿越过渡层发生的碰撞是随机的。颗粒雷诺应力存在于沙床上方250mm以下，随着高度的增加，颗粒雷诺应力急剧下降。在沙床高度250mm以上，只有气相剪切应力起作用。这时，颗粒的浓度非常低，虽然颗粒和气相之间仍然有速度差 ...
杨杰程, 刘大有, 张宇
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Conservation Biology, EarlyView.Abstract Qualitative approaches are increasingly applied in conservation social science, yet methodological reflection remains limited. Member checking, a process of returning findings to participants for feedback, is widely recognized outside conservation as a means to enhance rigor and reciprocity, but it is rarely reported in conservation research ...
Judith J. Rakowski +6 more
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Using the capabilities approach to achieve people‐centered conservation
Conservation Biology, EarlyView.Abstract Top‐down interventions carried out by state and nonstate institutions to conserve biodiversity and improve the lives of forest‐proximate people (FPP) in the Global South tend to reflect economistic understandings of human well‐being. More progressive and people‐centered conservation projects are guided by normative visions of how the world ...
Arthur Rodrigues +4 more
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International Journal of Applied Linguistics, EarlyView.ABSTRACT This study examines how foreign language teachers’ beliefs about the medium of instruction and translanguaging evolve over time by revisiting three in‐service teachers twelve years after their initial interviews. Using a qualitative longitudinal design, the study traces how translanguaging was initially framed as pedagogically deficient but ...
Danping Wang
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International Journal of Applied Linguistics, EarlyView.ABSTRACT With the increasing number of Chinese international students in Australian universities, intercultural competence has become a critical factor influencing their interactions with Australian tutors in university classroom settings. Existing research often examines students’ intercultural competence from a single‐method or single‐perspective ...
Jiangyu Han, Linda Tsung
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, 2018 我国页岩气储量丰富, 已探明的页岩气储量居世界首位, 页岩气等非常规能源开发是国家重要培育方向. 但是国内页岩气藏储层呈低孔隙度、低渗透率的物性特征, 需要更有效的水力压裂以改善页岩气在岩石中的渗透性质, 开采难度远大于其他国家. 水力压裂技术难以在页岩中形成大规模的交联裂纹网络, 是我国页岩气开采中存在的基本难题之一. 水力压裂是流-固耦合作用下强非线性的固-液界面问题.
沈文豪
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