Results 1 to 10 of about 950,555 (87)
Dizhen xuebao, 2023 为深入理解井水位同震响应机理，本文开展了向完整井-松散含水层系统输入由不同频率和振幅（加速度）组成的正弦波荷载的振动台实验。以实验模型为物理模型，建立了振动作用下松散承压含水层中孔隙水压力响应的流固耦合模型和含水层水流与井流的相互作用模型，并运用多物理场耦合模拟软件COMSOL Multiphysics对实验过程进行了数值模拟。实验中观测到的四种典型水位变化形态与野外场地同震井水位变化形态相似。数值模拟结果显示，本研究建立的数学模型能较好地反映松散承压含水层中孔隙水压力和水位的响应情况 ...
Zeyu Zhai +4 more
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Gongye shui chuli, 2003 把水质均化过程分为两种类型:恒水位水质均化过程和变水位水质均化过程,分别建立了两种数学模型:节点模型和微分模型,求解模型得出了可用来模拟计算水质均化池最小有效容积迭代公式,说明了模拟算法的应用要点。
张钰镭
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, 1991 本文以(由页)塘河为例,研究了中小河流水质模型参数,提出了一整套更为简便易行的估计中、小河流模型参数的方法,分析了准确估计模型参数的影响因素,得到了适用于(由页)塘河水质模型参数K_1、K_2、K_3及D_L的估计结果.该结果可直接应用于(由页)塘河的水质数值模拟,对于其它中 ...
徐丰
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, 1987 本文目的在于发展一个计算土壤内水分输送及能量交換的物理模型——耦合型模型,驱动该模型的大气条件是由实测而得的,引用对蒸发的土壤表面阻抗关联了在大气中水汽通量与从地表的蒸发,由于这种阻抗引入 ...
孙菽芬
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Gongye shui chuli, 2018 首次对WASP（water quality analysis simulation program）水质模型进行优化来模拟预测表流人工湿地的水质变化。由于表流人工湿地中水生植物吸收和微生物降解作用的显著增强，通过模型率定所得WASP模型水力学、植物、生化反应的相关参数值明显高于模拟天然水体时的推荐值。对改进后WASP模型的验证结果表明，湿地水质（COD和NH4+-N）模拟值与实测值基本吻合，证明改进后的WASP模型能够有效模拟预测表流人工湿地的水质变化。
陈德坤, 朱文博, 王洪秀, 梁爽
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Shuitu Baochi Xuebao, 2021 在水文模型中耦合准确模拟农户灌溉用水行为的模块可以构建更符合实际的灌区水循环模型，可以定量计算农户灌溉用水对渠井结合灌区水循环的影响。以典型渠井结合灌区——陕西省宝鸡峡灌区为研究区，采用问卷调查与访谈的方式收集了大量的农业生产和农户灌溉用水数据，在深入分析灌溉用水影响因素互馈关系和渠井结合灌区水循环特征的基础上，采用Python语言构建了渠井结合灌区农户灌溉用水模型（HCLU模型），该模型由水文、作物、农户生计和灌溉行为4个模块组成 ...
潘嘉培, 降亚楠
doaj
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 +2 more
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Emerging applications of large language models in ecology and conservation science
Conservation Biology, EarlyView.Abstract Large language models (LLMs) mark a major development in artificial intelligence, with potentially transformative implications for ecology and conservation science. Built on advanced deep‐learning architectures, these models can support a wide range of tasks. We reviewed emerging applications of LLMs, drawing on the wider scientific literature
Christos Mammides +5 more
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The Development and Validation of the Chinese Vocabulary Levels Test
International Journal of Applied Linguistics, EarlyView.ABSTRACT In response to the increasing need for effective Chinese vocabulary assessments, this study developed the Chinese Vocabulary Levels Test (CVLT), a test designed for intermediate‐level Chinese as a second or foreign language (CSL/FL) learners, based on the vocabulary lists (levels 4–6) from the Chinese Proficiency Grading Standards for ...
Shiwei Qi, Ailan Fu
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Exploring English Language Learners’ Vocabulary Knowledge and Usage When Speaking
International Journal of Applied Linguistics, EarlyView.ABSTRACT Vocabulary forms a fundamental component of speaking ability, as it enables speakers to convey meaning accurately, fluently, and effectively. Although the relationship between vocabulary and speaking has been investigated to some extent, gaps remain in understanding the link between learners’ vocabulary knowledge and their speaking proficiency,
Junyan Guo, Martin East
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