Results 11 to 20 of about 1,506 (134)

Highly efficient fluid-solid coupled incompressible SPH simulation method for atherosclerotic plaque generation(动脉粥样硬化斑块生成的高效流固耦合不可压缩SPH模拟方法)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2023
动脉粥样硬化是导致心血管疾病和中风的关键诱因,对该病变过程进行模拟与可视化有助于开展医学研究。为解决现有模拟方法不能可视化动脉粥样硬化斑块生成过程以及模拟速度过慢问题,提出了一种基于高效流固耦合不可压缩光滑粒子流体动力学(smoothed particle hydrodynamics,SPH)的斑块生成模拟方法。首先,基于流固耦合不可压缩SPH方法,将血液离散为不可压缩流体粒子,以控制血液流动的稳定性;然后,使用斑块生成模型对血液、单核细胞等粒子建模,对血液成分进行病理性分析,控制斑块生成;最后 ...
汪飞(WANG Fei)   +5 more
doaj   +1 more source

非狭窄性颈动脉斑块与前循环不明原因栓塞性卒中的相关性研究 Correlation of Non-Stenotic Carotid Plaque with Anterior Circulation Embolic Stroke of Undetermined Source

open access: yesZhongguo cuzhong zazhi, 2022
目的 探索同侧非狭窄性颈动脉粥样硬化斑块特征与前循环不明原因栓塞性卒中(embolic stroke of undetermined source,ESUS)的相关性。 方法 回顾性纳入北京市大兴区人民医院神经内科2017年1月-2022年5月连续住院的急性单侧前循环缺血性ESUS患者。采用颈动脉超声评估双侧非狭窄性颈动脉粥样硬化斑块,比较梗死同侧颈动脉与对侧颈动脉斑块的发生率、多发斑块的发生率、不均质回声斑块的比例以及颈动脉斑块厚度等特征的差异。 结果 共纳入101例ESUS患者,平均年龄60.7±
徐莹鑫, 张爽, 周晓梅, 袁景林, 赵留庄, 杨海华
doaj   +1 more source

Obstruction of biodiversity conservation by minimum patch size criteria

open access: yesConservation Biology, Volume 37, Issue 5, October 2023., 2023
Abstract Minimum patch size criteria for habitat protection reflect the conservation principle that a single large (SL) patch of habitat has higher biodiversity than several small (SS) patches of the same total area (SL > SS). Nonetheless, this principle is often incorrect, and biodiversity conservation requires placing more emphasis on protection of ...
Federico Riva, Lenore Fahrig
wiley   +1 more source

Female preference for males with lower pattern contrast follows Weber's law of proportional processing in jumping spiders

open access: yesFunctional Ecology, Volume 37, Issue 9, Page 2434-2446, September 2023., 2023
Read the free Plain Language Summary for this article on the Journal blog. Abstract According to Weber's law of proportional processing, perceptual discrimination between stimuli of different magnitudes is based on their proportional differences in magnitude (not absolute differences).
Bernetta Z. W. Kwek   +4 more
wiley   +1 more source

Effects of forest fragmentation on avian breeding activity

open access: yesConservation Biology, Volume 37, Issue 4, August 2023., 2023
Abstract Biodiversity declines and ecosystem decay follow forest fragmentation; initially, abundant species may become rare or be extirpated. Underlying mechanisms behind delayed extirpation of certain species following forest fragmentation are unknown.
Charles P. J. Coddington   +2 more
wiley   +1 more source

斑块对基于CTA虚拟计算冠状动脉血流储备分数的影响

open access: yesZhongshan Daxue xuebao. Yixue kexue ban, 2023
目的基于CT冠状动脉造影图像计算虚拟血流储备分数使冠状动脉病变的功能无创评估成为可能,目前尚不清楚斑块是否会影响基于CTA虚拟计算的冠状动脉血流储备分数,本研究以有创FFR为参考标准,分析斑块对CT-QFR值的影响。方法:回顾性研究纳入了在60 d同时接受CT冠状动脉造影(CCTA)和血流储备分数(FFR)检查的108例疑似CHD患者。通过虚拟血流计算相关软件分析CCTA图像,获得目标血管的虚拟血流储备分数(CT-QFR)、目标血管斑块的定量及定性分析,其中包括总斑块体积、斑块负荷、钙化斑块体积 ...
陈柳丹   +3 more
doaj   +2 more sources

基于多对比度磁共振血管壁成像技术对前循环症状性颅内外动脉粥样硬化斑块特征的对比研究 Characteristics of Symptomatic Intra- and Extracranial Atherosclerotic Plaques in Anterior Circulation Based on Multi-contrast Magnetic Resonance Vascular Wall Imaging

open access: yesZhongguo cuzhong zazhi, 2019
【摘要】 目的 基于多对比度MRI血管壁成像技术,比较颅内动脉、颅外动脉粥样硬化斑块的特征。 方法 回顾经3D多对比度头颈联合MRI血管壁成像检查确定存在前循环症状性颅内外动脉粥样硬化斑块的患者资料。观察斑块分布情况;测量斑块负荷,包括斑块最大管壁厚度、长度、管腔狭窄程度;分析斑块内成分,包括脂质坏死核、出血、钙化,对比分析颅内动脉和颅外动脉粥样硬化斑块的影像学特征。 结果 在入组的45例患者中,共检出颅内、外动脉粥样硬化斑块203个,其中颅外动脉斑块156个(76.8%),颅内动脉斑块47个 ...
许艺兰,李睿,崔园园,郑卓肇,赵锡海
doaj   +1 more source

血脂谱构成与颈动脉斑块性质演变相关性的临床研究

open access: yesZhongguo shiyan zhenduanxue, 2020
目的探讨血脂成分构成与颈动脉斑块性质的相关性。方法通过回顾性研究方法,随机筛选入组吉林大学中日联谊医院神经内科缺血性脑血管病人228例,患者均伴有颈动脉硬化,统计分析有斑块与无斑块组及不同性质板块组与血脂成分构成的相关性。结果有斑块组病人血脂总胆固醇程度较无斑块组有显著升高;软斑块组低密度脂蛋白水平较无斑块组升高明显 ...
杨旭   +6 more
doaj  

血脂水平与颈动脉斑块体积的关系探讨

open access: yesZhongguo shiyan zhenduanxue, 2020
目的探讨血脂水平对颈动脉斑块体积的影响。方法应用三维超声探头收集颈动脉斑块信息,并利用机器配备的VPQ软件分析计算得到颈动脉斑块体积。单因素和多元线性回归方法分析斑块体积与常见脑血管影响因素(高血脂症、高血压病、糖尿病、吸烟史)的关系,同时分析斑块体积与血总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白(LDL-C)、高密度脂蛋白(HDL-C)相关性,并根据斑块体积大小将斑块分为斑块较大组及斑块较小组,比较两组人群上述血脂各参数的差异。结果单因素分析结果显示,斑块体积与高血压病及高血脂症有关 ...
孟令萃   +4 more
doaj  

Biodiversity‐driven spatial conservation planning to delineate temporally stable regions

open access: yesConservation Biology, Volume 40, Issue 3, June 2026.
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

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