Results 31 to 40 of about 25,326 (175)

速度向量成像技术评价颈动脉硬化斑块内部应变

open access: yesZhongguo shiyan zhenduanxue, 2011
颈动脉粥样硬化斑块与缺血性脑卒中密切相关,而斑块的不稳定性是其危险性的最重要因素。因此对于颈动脉粥样硬化斑块稳定性的研究尤为重要。本研究应用速度向量成像(VVI)技术初步分析颈动脉粥样硬化斑块受力后的形变特点,探讨该项技术在评价斑块力学状态方面的应用价值 ...
冯海艳   +5 more
doaj  

Æ E Æ Å – Reshaping the Role of Træna Fishermen

open access: yes, 2022
This diploma project aims to strengthen the viability of Træna’s community by proposing an ocean research facility in the archipelago, enabling the next generation of local fishermen to collect oceanographic data while working at sea. The idea of the fisherman as oceanographer is inextricably linked to the architectural program on the island of ...
openaire   +1 more source

Predicting Spatial Distributions of Mammalian Predation on Translocated Wild Turkeys in Agriculturally Dominated Landscapes 在以农业为主的景观中哺乳动物对易地放归的野生火鸡捕食的空间分布预测

open access: yesWildlife Letters, Volume 3, Issue 3, Page 91-98, September 2025.
The edge densities of cropland, developed land, and water bodies (panel a) predict the spatial probability of mammalian predation on wild turkeys (panel b) using Mahalanobis distance factor analysis in Quitman County, Mississippi, United States. The three habitat fragmentation variables are represented by three arrows, respectively.
Guiming Wang   +2 more
wiley   +1 more source

威海市斑块冬季鸟类多样性与生境的关系

open access: yes, 2012
近年来,威海一直致力于生态城市的建设。物种多样性是生态城市的重要指标,而在物种多样性中,城市鸟类多样性起着重要的作用。本文调查了冬季威海7个斑块(2个校园和5个典型生活小区)的鸟类多样性,对其物种多样性指数以及均匀度指数进行分析,得出山东大学校园和哈尔滨工业大学校园的鸟类多样性高于5个小区斑块,而且2个校园斑块的均匀度在7个斑块中也处于较高水平。另外,结合实际情况,文章从绿化面积、城市栖息地的空间异质性、生境破碎化程度以及人为干扰4个方面对城市鸟类丰富度与多样性的影响因素做出讨论 ...
王超锋   +5 more
core   +1 more source

扎龙自然保护区丹顶鹤巢址景观连接度评价

open access: yes野生动物学报, 2018
景观连接度度量了物种在斑块之间的运动不受阻碍的连通性,对生境质量和破碎化研究有重要意义。本文基于2004年和2013年扎龙自然保护区遥感影像的解译分类,采用基于图论法的面积权重指数(AWF)划定巢址景观连接度等级,然后对不同景观连接度区域的景观格局特征指数进行分析。结果显示:2004年高景观连接度的丹顶鹤生境斑块面积为522.16 km2,而2013年高景观连接度斑块下降为432.82 km2,高景观连接度斑块集中分布于核心区内部; 2013年高景观连接度斑块的平均斑块周长面积比明显高于其他斑块 ...
李菲菲 马社刚 李 浩 袁 力 程 鲲 马建华
doaj  

Biosphere reserves in the megadiverse Cape Floristic Region are effective in conserving arthropod diversity 开普植物区的生物圈保护区有效保护了节肢动物多样性

open access: yesIntegrative Conservation, Volume 3, Issue 4, Page 312-329, December 2024.
Biosphere reserves aim to protect global biodiversity alongside social and economic development. In the Cape Floristic Region, biosphere reserves are an effective conservation approach to protect arthropods against habitat transformation in this biodiverse region.
Michael J. Samways   +3 more
wiley   +1 more source

颈动脉彩超检测粥样斑块对预防缺血性脑卒中的意义

open access: yesZhongguo shiyan zhenduanxue, 2018
目的探讨颈动脉彩超检查粥样斑块对预防缺血性脑卒中(ischemic cerebral stroke,ICS)的临床意义。方法选取我院神经内科住院52例ICS患者设为脑卒中组,另选取同期体检健康者50例设为对照组。所有受检者均进行颈动脉彩色多普勒超声检测,记录动脉粥样硬化斑块的数量、性质和部位。比较两组颈部动脉斑块(软斑、硬斑、混合斑)检出率、颈部动脉(左颈总动脉、右颈总动脉、左颈内动脉颅外段、右颈内动脉颅外段)内径。结果脑卒中组检测出粥样斑块96个,对照组24个;脑卒中组软斑、混合斑检出率均高于对照组 ...
王旭东
doaj  

缺血性卒中患者颈动脉斑块与内皮素-1及丙二醛水平的相关性分析 Correlation of Endothelin-1 and Malondialdehyde with Carotid Plaques in Patients with Ischemic Stroke

open access: yesZhongguo cuzhong zazhi, 2018
目的 探讨急性缺血性卒中患者颈动脉粥样硬化斑块与血浆内皮素-1(endothelin-1,ET-1)及丙二醛 (malondialdehyde,MDA)水平的关系。 方法 118例急性缺血性卒中患者均行颈动脉超声检查,分为动脉内膜正常组(12例)、动脉内膜 增厚组(28例)及动脉斑块组(78例);并将斑块组分为I级斑块(21例)、II级斑块(25例)、III级斑块 (32例)。测定各组患者血浆ET-1及MDA水平,并进行统计分析。 结果 内膜正常组、内膜增厚组和斑块组血浆ET-1水平分别为(2.34±0.
温慧军, 吕敏
doaj   +1 more source

Multi‐Scale Spatial Effects Determine Nest Success in Small Urban Forest Patches 多尺度空间效应决定了城市小型森林斑块中的筑巢成功率

open access: yesWildlife Letters, Volume 2, Issue 4, Page 192-203, December 2024.
Knowledge of the reproductive success of organisms in urban habitat fragments is needed to conserve biodiversity in our urbanizing world. We found that differences in nest success among birds in urban forest patches is explained by factors on three distinct spatial scales even across a limited urban development gradient.
Ohad J. Paris, Colin E. Studds
wiley   +1 more source

颅内外动脉并存粥样硬化斑块的影像学研究进展 Advances in Imageology of Intra- and Extracranial Coexisting Atherosclerotic Plaques

open access: yesZhongguo cuzhong zazhi, 2018
颅内动脉和颅外颈动脉并存粥样硬化斑块(简称并存斑块)在亚洲人群中具有较高的发 生率,其与缺血性卒中的发病风险具有显著的相关性。因此,早期识别并存斑块对于缺血性脑血管 事件的防控具有重要意义。目前,应用于并存斑块的影像学诊断方法有多种,其中高分辨率磁共振管 壁成像有广阔的应用前景。本文将主要针对并存斑块的影像学研究进展方面进行综述。 Abstract: Intra- and extracranial coexisting atherosclerotic plaques (coexisting ...
柳洋,韩华璐,赵锡海,王苇
doaj   +1 more source

Home - About - Disclaimer - Privacy