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regularity of diffusion
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  “regularity of diffusion”译为未确定词的双语例句
     Study on the Regularity of Diffusion and Extension of Monochamus sutor L. in the Burned Areas of the Great Xing'an Mountains
     云杉小黑天牛在火烧迹地扩散蔓延的规律
短句来源
     A Study on the Regularity of Diffusion and Extension of Population of Ips subelongatus Motsch. in the Burned Areas of the Great Xing'an Mountains
     火烧迹地落叶松八齿小蠹种群扩散蔓延规律
短句来源
     OBJECTIVE: To investigate the manifestation and regularity of diffusion coefficient in middle cerebral artery occlusion (MCAO) of rats after cerebral ischemia.
     目的:观察大鼠大脑中动脉脑缺血后表观弥散系数的表现及变化规律。
短句来源
  相似匹配句对
     ON THE REGULARITY OF MEASURE
     论测度的正则性
短句来源
     Finally, it has regularity.
     最后,它具有一定规则性。
短句来源
     On the Regularity Of Crime
     论犯罪规律
短句来源
     NOTES ON F-REGULARITY
     关于F-正则性的注记
短句来源
     CRITERIA FOR REGULARITY OF ELLIPTICDIFFUSION PROCESSES
     一致椭圆扩散过程的正则点判据(英文)
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The regularity of diffusion and extension in Ips subelongatus Motsch.was studied from 1988 to 1989 in the burned areas of the Great Xing'an mountains.A linear relationship between the level of diffusion and extension,and population density in the burned areas,and the physiological conditions in the nearby stands was established.A mathematical model of the diffusion and extension of population of Ips subelongatus in the burned areas was established.

1987年大兴安岭发生特大森林火灾,为落叶松八齿小蠹猖獗发生提供了优良的环境条件.经过1988、1989两年的研究,发现落叶松八齿小蠹种群扩散已从重度火烧林转向中、轻度火烧林,每年扩散危害的距离在10m左右;提出扩散蔓延的数学模型为Y=0.67+1.66X,落叶松八齿小蠹扩散蔓延程度与虫源基地中其种群密度和被扩散林分的生理状况有关.其相关数学模型为Y=2.70X+0.25X_2-1.76,落叶松八齿小蠹种群在火烧迹地上扩散属于聚集型扩散.

BACKGROUND: Some researches report that diffusion-weighted imaging (DWI) can appear abnormal signal in minutes after cerebral ischemia. OBJECTIVE: To investigate the manifestation and regularity of diffusion coefficient in middle cerebral artery occlusion (MCAO) of rats after cerebral ischemia.DESIGN: Randomized controlled study.SETTING: Neurological Department of Clinical College of Chongqing Medical University. MATERIALS: The experiment was conducted at the Radiological Department of the First Affiliated...

BACKGROUND: Some researches report that diffusion-weighted imaging (DWI) can appear abnormal signal in minutes after cerebral ischemia. OBJECTIVE: To investigate the manifestation and regularity of diffusion coefficient in middle cerebral artery occlusion (MCAO) of rats after cerebral ischemia.DESIGN: Randomized controlled study.SETTING: Neurological Department of Clinical College of Chongqing Medical University. MATERIALS: The experiment was conducted at the Radiological Department of the First Affiliated Hospital of Chongqing Medical University from April to July 2004. Totally 18 adult Wistar rats with clean grade were randomly divided into three groups: control group, sham operation group and cerebral ischemia group with 6 rats in each group.METHODS: The origin of right middle cerebral artery was blocked with filament into right internal carotid. In the sham-operated group, the filament was just inserted into the common carotid artery not into the origin of middle cerebral artery, rats in normal control group were not treated with anything after anesthesia. MRI experiments were performed on a 1.5 T GE signa Highspeed NMR spectrometer to obtain DWI and ADC values at the time-point of 7, 15, 30, 60 minutes, 3,6, 12, 24 hours, 3, 7, 15 days, 1 and 2 months after operation.MAIN OUTCOME MEASURES: Changes of ADCs in infarct hemisphere and contralateral hemisphere.RESULTS: There was no significant change in MRI T1-and T2-weighted imaging in rats at 7 minutes post-infarction, but abnormal high intensity was emerged during the period of 1 hour to 3 hours, and enlarged over time. Finally, the infarction area located the right basal ganglia and the frontal-parietal lobes at 12 hours and increased less significantly later. Focal abnormal high signal was noted in DWI 7 minutes after cerebral ischemic insult, and the ADC values was decreased at the same time, reduced gradually after significant recover at 30 minutes, dropped to the lowest level at 12 hours and again increased at 24 hours, since then all the ADC values were remained high throughout follow-up, which increased by 5 times at 2 months than that at 12 hours. Correspondingly, rADC values showed the contrary pattern of evolution. CONCLUSION: It is reflected that ADC is highly sensitive not only to onset of cerebral ischemia but also to chronic cerebral ischemia.

背景:有研究表明,弥散加权成像可以在脑缺血后数分钟即出现异常信号。目的:观察大鼠大脑中动脉脑缺血后表观弥散系数的表现及变化规律。设计:随机对照实验。单位:重庆医科大学临床学院神经内科。材料:实验于2004-04/07在重庆医科大学附属第一医院放射科完成,选择成年Wistar清结级大鼠18只。随机分为正常对照组,假手术组和脑缺血组,每组6只。方法:采用右侧大脑中动脉栓塞法制作脑缺血模型,假手术组栓塞线仅插入颈内动脉未深及大脑中动脉的起始处,正常对照组麻醉后不作任何处理。于术后7,15,30min,1,3,6,12,24h,3,7,15d,1,2个月做1HMRS检查,获得弥散加权成像和表观弥散系数值。主要观察指标:大鼠脑梗死区域和对侧半球相应区域表观弥散系数值的变化。结果:大鼠缺血组DWI于术后7min出现异常高信号,此时T1WI,T2WI扫描示正常。T1WI,T2WI于缺血后1~3h出现异常高信号,随时间的推移,异常高信号的区域扩大,12h后右侧基底节和额顶叶皮质梗死,以后梗死面积增加不明显。表观弥散系数值于7min时发现降低,30min时表观弥散系数明显升高,1h后开始降低,12h时降到最低水平,24h以后又...

背景:有研究表明,弥散加权成像可以在脑缺血后数分钟即出现异常信号。目的:观察大鼠大脑中动脉脑缺血后表观弥散系数的表现及变化规律。设计:随机对照实验。单位:重庆医科大学临床学院神经内科。材料:实验于2004-04/07在重庆医科大学附属第一医院放射科完成,选择成年Wistar清结级大鼠18只。随机分为正常对照组,假手术组和脑缺血组,每组6只。方法:采用右侧大脑中动脉栓塞法制作脑缺血模型,假手术组栓塞线仅插入颈内动脉未深及大脑中动脉的起始处,正常对照组麻醉后不作任何处理。于术后7,15,30min,1,3,6,12,24h,3,7,15d,1,2个月做1HMRS检查,获得弥散加权成像和表观弥散系数值。主要观察指标:大鼠脑梗死区域和对侧半球相应区域表观弥散系数值的变化。结果:大鼠缺血组DWI于术后7min出现异常高信号,此时T1WI,T2WI扫描示正常。T1WI,T2WI于缺血后1~3h出现异常高信号,随时间的推移,异常高信号的区域扩大,12h后右侧基底节和额顶叶皮质梗死,以后梗死面积增加不明显。表观弥散系数值于7min时发现降低,30min时表观弥散系数明显升高,1h后开始降低,12h时降到最低水平,24h以后又开始上升,2个月时表观弥散系数值较最低水平约增加5倍,而且随访的2个月中表观弥散系数始终保持明显上升的趋势。相对表观弥散系数显示出相反的变化。结论:表观弥散系数均可以超早期揭示脑缺血的发生,同时对脑血管疾病慢性期也非常敏感。

 
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