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Equine Veterinary Journal, Volume 55, Issue 2, Page 261-269, March 2023., 2023 Summary Background In clinical practice, early diagnosis of Equine Odontoclastic Tooth Resorption and Hypercementosis (EOTRH) and other resorptive incisor diseases is difficult to achieve. The radiographic appearance of subtle pathological changes has not been described in detail and might be confused with age‐related changes.
Louisa Albers +4 more
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Numerical simulation of particle deposition in semicircular ribbed duct(半圆形粗糙元壁面颗粒沉积数值模拟研究)
Zhejiang Daxue xuebao. Lixue ban, 2022 为研究半圆形粗糙元壁面对颗粒沉积的影响，分别采用雷诺应力模型（RSM）和离散相模型（DPM）求解流场与颗粒运动轨迹，并结合临界速度判别颗粒沉积的方法。通过构建不同半圆形粗糙元参数（e/D，p/e）的通风管道计算域，研究了1~10 μm颗粒沉积速度变化及沿气流方向颗粒的沉积趋势，分析了流场所引起的湍流变化对颗粒沉积的影响，与相同参数下的方形粗糙元壁面颗粒沉积特性进行了对比。同时，分析了粗糙元参数对颗粒沉积速度的影响。结果发现，半圆形壁面颗粒沉积速度小于同参数下的方形壁面颗粒沉积速度 ...
HUANGQiuyan(黄秋焰) +2 more
doaj +1 more source
Exploiting Light Directionality for Image‐Based 3D Reconstruction of Non‐Collaborative Surfaces
The Photogrammetric Record, Volume 37, Issue 177, Page 111-138, March 2022., 2022 The paper investigates the effect of light directionality and the fusion of multiple images to improve the quality of photogrammetric 3D reconstruction of complex surfaces (textureless and shiny). We present an image capturing system that utilizes multiple light sources to highlight roughness which is not visible in traditional diffuse images ...
Ali Karami +3 more
wiley +1 more source
全球能源互联网, 2019 准确评估风电场发电量水平对项目开发至关重要。针对海岸线附近的近海风电场，结合已建项目的测风塔数据和风电机组运行资料，得出WAsP计算模型主要参数取值。近海地区的风资源及发电量呈现一定的衰减规律，通过不同粗糙度和尾流衰减系数的设置，验证各方案模型电量与实际电量的拟合水平。结果表明，风电场的粗糙度取值要结合地形地貌、海洋水文条件等因素，海岸线附近近海风电场的粗糙度取值略高于软件推荐值，粗糙度水平为0～0.005 m；Park模型尾流衰减系数越小，发电量越小，不同的尾流衰减系数对发电量计算结果影响高达4.9%，
王尼娜 +5 more
doaj +1 more source
Research progress on the impact of mineral surface roughness on particle-bubble interaction [PDF]
, 2023 Mineral surface roughness is an important factor affecting flotation efficiency. Surface roughness can affect the hydrophobicity of minerals, the adsorption of reagents, and the rupture of liquid films between particles and bubbles, resulting in a ...
Guangyuan XIE +4 more
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Shuitu Baochi Xuebao, 2023 粗糙度是影响坡面流水动力特性的关键因子,为探究渐变粗糙度影响下坡面流水力特性,采用粒子图像测速技术(particle image velocimetry, PIV)观测并分析3组流量下渐变粗糙床面下坡面流的流速轮廓线、紊动强度、雷诺应力和壁面切应力的变化规律。结果表明:(1)流速随粗糙度增加而减小;拟合无量纲流速得到流速分布对数公式,粗糙度增大与拟合常数A成反比,与积分系数B成正比。(2)渐变地表粗糙度流向紊动强度与光滑床面坡面流变化趋势相似。流向紊动强度随相对水深的增大而减小。随着粗糙度增大 ...
谷方正 +4 more
doaj
Gaoya dianqi, 2022 环氧树脂材料在电场作用下会出现表面电荷积聚现象导致沿面放电。为改善环氧树脂材料的直流绝缘性能，文中对环氧树脂试品表面进行局部粗糙度处理，开展闪络实验，探究局部粗糙度处理在空气、C4F7N/CO2混合气体和SF63种气体环境中对环氧树脂试样闪络特性的影响。建立二维仿真模型，通过有限元法分析局部粗糙度处理后环氧树脂材料的表面电荷特性以及陷阱分布。根据闪络实验结果，粗糙面位置不同的环氧树脂试品的沿面闪络电压在3种气体中均随表面粗糙度的增加呈现先上升后下降的趋势，并在粗糙面位于中心且表面粗糙度为1.3 ...
律方成 +5 more
doaj
裸露砒砂岩区坡面侵蚀过程中地表粗糙度与水力侵蚀特征参数的关系
Shuitu Baochi Xuebao, 2022 坡面地形起伏状况是影响土壤侵蚀状况的重要因素,深入了解地表粗糙度和产流产沙以及水动力参数之间的关系是研究坡面土壤侵蚀过程的基础。采用野外原位模拟冲刷试验,使用三维激光扫描仪结合ArcGIS提取地形因子参数,研究了裸露砒砂岩区坡面侵蚀过程中地表粗糙度与侵蚀特征参数的关系。结果表明:(1)冲刷强度的增大使得阻力特征参数逐渐降低,且随着冲刷时间的增加,弗劳德数也呈现降低趋势,其他水力学参数呈增大趋势 ...
董晓宇 +5 more
doaj
Kongjian kexue xuebao, 2023 卫星散射计通过测量海表粗糙度反演全球海面风场。对于Ku波段散射计，海表粗糙不仅和海面风场相关，还受海表温度的二阶效应调制。定量研究了海表温度对中法海洋卫星（CFOSAT）散射计（CSCAT）反演风速和后向散射测量的影响。结果表明，CSCAT两种极化方式测量的后向散射系数都会受到海表温度的影响，但是垂直极化中低入射角（θ < 36°）测量的后向散射系数几乎不随温度变化。因此CSCAT的风速偏差也随海表温度的变化而变化，且随着入射角的增大和风速的减小，海表温度对风速偏差的影响程度增大 ...
赵 晓康 +3 more
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Scaling range sizes to threats for robust predictions of risks to biodiversity
Conservation Biology, Volume 32, Issue 2, Page 322-332, April 2018., 2018 Abstract Assessments of risk to biodiversity often rely on spatial distributions of species and ecosystems. Range‐size metrics used extensively in these assessments, such as area of occupancy (AOO), are sensitive to measurement scale, prompting proposals to measure them at finer scales or at different scales based on the shape of the distribution or ...
David A. Keith +2 more
wiley +1 more source