Results 21 to 30 of about 19,101 (258)

基于混合产流模式的黄土高原流域水沙过程耦合模拟

open access: yesShuitu Baochi Xuebao, 2023
为深入理解黄土高原干旱半干旱地区复杂地貌条件下流域水沙运移规律。基于垂向混合产流机理和运动波方程,构建分布式流域水文模型,耦合流域土壤侵蚀和泥沙输移过程模拟模块,并考虑梯田对水沙过程的影响,建立适用于黄土高原的分布式流域水沙过程模型。选取黄土高原延河支流西川河流域多年实测场次洪水过程的径流泥沙资料,对模型进行率定和验证。径流模拟的纳什效率系数在0.56以上,平均值超过0.70,模拟次洪过程的峰形、峰值、峰现时间与实测过程具有较好的一致性;侵蚀产输沙模拟精度较低,其纳什效率系数均值率定期为0.79 ...
卢昂   +7 more
doaj  

数值模拟分析在八米河定向钻穿越施工中的应用

open access: yes城市建设理论研究—市政工程, 2022
论文结合国家管网集团华北公司南武管道南疆出站22.3km处定向钻内腐蚀隐患治理工程实际,采取数值模拟技术分析,进一步优化穿越设计曲线,成功避开了地下多处建构筑物穿越风险,有效实现了对地下重要管道的安全防护,对今后类似工程具有很好的实际借鉴意义。
田 梅
semanticscholar   +1 more source

Influence of Spatial Reinforcement Corrosion on Shear Performance of RC Beams---Based on a Numerical Investigation [PDF]

open access: yes, 2016
钢筋混凝土(以下简称RC)结构的耐久性近年来逐渐成为国内外广泛关注的问题。其中,钢筋锈蚀是影响RC结构耐久性的重要因素之一。然而,以往大部分研究多是针对受弯性能,而对于受剪性能的关注较少。但在海洋氯化物环境下,由于箍筋相对截面较小且易受氯离子侵蚀,箍筋的锈蚀程度较纵向受拉钢筋严重,有可能发生脆性的受剪破坏先于受弯破坏的预期外现象。再者,大部分的研究多是考虑钢筋整体均匀锈蚀对结构性能的影响,但这与实际结构中混凝土内部的钢筋锈蚀多呈非均匀、非对称的空间分布不符。 数值模拟是一种非常有效的研究方法 ...
张瀚引
core  

Constructed value of information with iterative scoring and parametric uncertainty to identify management‐relevant research priorities for a declining raptor species

open access: yesConservation Biology, EarlyView.
Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis   +7 more
wiley   +1 more source

Using porous metals to enhance heat transfer in phase change materials (PCMs) [PDF]

open access: yes, 2011
Heat transfer enhancement mechanism of Phase Change Materials (PCMs) by high-porosity metal foams was investigated in this study. The Darcy-Brinkman-Forchheimer modified flow model was employed in the numerical simulations to consider the non-Darcy ...
Tian, Y. (Yuan), Zhao, Changying
core  

Biodiversity‐driven spatial conservation planning to delineate temporally stable regions

open access: yesConservation Biology, EarlyView.
Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella   +5 more
wiley   +1 more source

Research of Resonator-sound-generator Atomizing Nozzle [PDF]

open access: yes, 2015
喷嘴技术的应用范围几乎包含所有工业领域、农业生产、交通运输以及人们的日常生活。作为必备组件在燃烧装置上的应用尤为重要。以往对于新型的流体动力式超声波雾化喷嘴研究表明:这类喷嘴的雾化粒径小(小于50μm)且分布均匀性好,对实现低氧燃烧、减少烟气中烟尘和氮氧污染物的排放有实质性的意义。因此本文以谐振腔式声能雾化喷嘴为研究对象,通过设计结构,利用FLUENT软件对其流场、声场以及雾化性能进行多参数的数值模拟,通过雾化性能的变化规律分析了其雾化机理。 研究首先基于哈特曼发声哨的原理设计了谐振腔式声能雾化喷嘴 ...
邢盼
core  

A Novel Topical Emollient Plus for Canine Atopic Dermatitis: A Clinical Trial Assessing Efficacy and User Acceptance

open access: yesVeterinary Dermatology, Volume 37, Issue 2, Page 293-305, April 2026.
Background: Canine atopic dermatitis (cAD) is a common, chronic skin condition characterised by epidermal barrier dysfunction, immune dysregulation and cutaneous dysbiosis. While “emollient plus” formulations are widely used in human atopic dermatitis, their role in cAD remains underexplored. Hypothesis/Objectives: To evaluate the clinical efficacy and
Beatriz Fernandes   +8 more
wiley   +1 more source

坡度影响下的砒砂岩区裸露坡面水分入渗特征及模拟

open access: yesShuitu Baochi Xuebao, 2022
为探究不同坡度(5°,10°,20°,30°)条件下,不同质地砒砂岩土壤(灰白色、混合色、紫红色)的水分入渗特征及最优入渗模型。通过室内模拟土柱法对土壤的水分入渗特征和拟合结果进行对比分析。结果表明:(1)研究区不同坡面土壤容重在1.513~1.737 g/cm3,30°坡面下的灰白色砒砂岩土壤入渗能力较强,5°坡面下的紫红色砒砂岩土壤入渗能力较弱。(2) 在砒砂岩土壤一维垂直 入渗过程中,初始入渗率为2.000~8.600 cm/min,入渗时间3.500~5.000 min后达到稳定入渗率(0 ...
吴佩瑶   +4 more
doaj  

Studies of the PPDF Chemical Reaction Rate Model for the Numerical Simulation of Nitrogen Oxides [PDF]

open access: yes, 2016
本文在目前应用广泛的湍流燃烧模拟方法PPDF,即预设概率密度函数的基础上,以混合分数和温度为变量,同时引入时间尺度的考虑,提出了一个NOx计算模型——PPDF化学反应速率模型。在该模型的理论基础上,使用CHEMKIN软件的SENKIN模块,以详细的化学反应机理计算NO的生成速率,并将计算结果拟合建立成数据库。 使用该模型在STAR-CD中计算了三组湍流非预混射流火焰:H2、H2/CO/N2和CH4/H2/N2射流火焰,并与Sandia实验室公布的实验数据进行比较 ...
封颖
core  

Home - About - Disclaimer - Privacy