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These effects were not due to differences in collateral flow, risk region size or hemodynamic variables between the groups.


In a control group the infarct size (necrotic volume/risk region volume × 100) was 15.8 ± 1.5%.


Infarct size was determined as the ratio of infarcted myocardium (tetrazolium stain) to the risk region (dye technique).


The anatomic risk region was determined antemortem by Evan's blue staining while the infarct zone was delineated postmortem by tetrazoleum staining.


The infarct size (% of risk region) was significantly greater in hypercholesterolemic rabbits than in controls (39±6 vs.

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 In order to determine the earthquake risk region, the relationship between the gravitational high and earthquakes occurring nearby is statistically studied by using the gravity data of the North China Plain area. The statistical results obtained indicate that the gravitational high must satisfy certain conditions in case of occurrence of an earthquake of magnitude Ms≥4 near the anomaly area. It is found that the greatest magnitude and total seismic energy released are highly correlated to the product of... In order to determine the earthquake risk region, the relationship between the gravitational high and earthquakes occurring nearby is statistically studied by using the gravity data of the North China Plain area. The statistical results obtained indicate that the gravitational high must satisfy certain conditions in case of occurrence of an earthquake of magnitude Ms≥4 near the anomaly area. It is found that the greatest magnitude and total seismic energy released are highly correlated to the product of the gravitational high area with the square root of its intensity. Most of earthquakes of magnitude Ms≥5 took place near the position with greater formvectors of gravitational high.According to the statistical results we can evaluate earthquake risk regions in the North China Plain area and indicate the conditions for applying these results. Furthermore, the physical implications of statistical parameters of gravitational high are also discussed herein.  本文利用华北平原重力资料,统计了重力高特征参数与发生在重力高附近的地震之间的关系。统计结果发现:重力高附近如有M_s≥4级地震发生,它应满足一定的特征条件;最大震级和地震总能量与重力高面积和强度的平方根之积有高度相关性;M_s≥5级地震绝大多数发生在较大的重力高形态矢量附近。根据统计结果预测了本区地震危险区,指出了统计结果的应用条件和物理含义。  On the basis of data from the field invesigation alongwith geophysical exploration and focal mechanism solutions, the authors have illustrated the tectonic framework of the crust and the characteristics of the tectonic stress field that had remained in the northern part of recent Henan area since Late Tertiary.A model has been developed for this crust segment that has been in a process of being deformed and the model has been put to test in many a way.The potential risk regions have been discussed for... On the basis of data from the field invesigation alongwith geophysical exploration and focal mechanism solutions, the authors have illustrated the tectonic framework of the crust and the characteristics of the tectonic stress field that had remained in the northern part of recent Henan area since Late Tertiary.A model has been developed for this crust segment that has been in a process of being deformed and the model has been put to test in many a way.The potential risk regions have been discussed for moderate and strong shocks.  豫北地区近几年来一直被定为全国重点监视区之一,但中强地震可能发生在哪里?这是大家所关心的问题。作者根据野外实地调查,并结合前人的地质,石油、煤田勘探,地壳测深等资料,提出了该区的主要构造格架及其新活动特征,晚第三纪以来区域构造应力场,并由此推论了应力的集中部位,同时以大自然的各种客观现象为佐证,检验了这一推论的可靠性,探讨了中强地震可能发生的地区。  In a given time interval from an initial value to time t, the accumulated strain releases in a large region controlled by a unified tectonic stress field are defined byj being the sum of earthquakes in the whole region.In the same time interval, the accumulated strain release of the kth preparing earthquake district within the region is:Where mk is the sum of earthquakes in the kth district.It is assumed that c is a constant for the large region controlled by unified tectonic stress field. Ei and Ei denote the... In a given time interval from an initial value to time t, the accumulated strain releases in a large region controlled by a unified tectonic stress field are defined byj being the sum of earthquakes in the whole region.In the same time interval, the accumulated strain release of the kth preparing earthquake district within the region is:Where mk is the sum of earthquakes in the kth district.It is assumed that c is a constant for the large region controlled by unified tectonic stress field. Ei and Ei denote the corresponding energies of seismic waves. We defineand Pk is the strain ratio for the kth district in the large region just before the time t.the. stresses must be readjusted after a strong shock, so that it leads the change of the stress system in a large region. We expect to obtain a quantity showing the characteristics of this adjustment and variation under the restraint of unified tectonic stress field. Investigating seismic activity of M≥5.0 in Sichuan and Yunnan provinces since 1500, the process can be expressed approximately by relative strain quantities Pk ( = 1, 2,…, 9). Since 1917, the large earthquake occurred in the nine preparatory earthquake districts, which corre sponds to the area of Pk ≤0.08. They are not found in area of Pk>0.08 This meas that the period of Pk>0.08 will be in safety to every preparatory districts. On the contrary, the period of Pk<0.08 will be danger. Thus, this would be a reference criterion of earthquake risk region in Sichuan and Yunnan provinces.  设以某个时间为起点至 t 时刻前的给定时段里,受统一构造应力场控制的大范围内的累积应变释放量为ε_0=1/C(?),j 是全区地震总个数。在同一给定时段里,该范围内的第 K 个孕震区的累积应变释放量为(?),m_k 是第 K 区地震总个数。其中,假定受统一构造应力场控制的大范围内,C 为常数;Ei 和 El 为相应的地震波能量。定义(?)为第 K 区在 t 时刻前夕的相对应变量。一次大震发生后,应力要重新调整,这必将引起一个地区应力系统的改变。我们希望有一个量来表明:在统一构造应力场控制下,这种调整、变化的特点。研究川滇地区1500年以来,M≥5.0级的地震活动表明,这一过程可以用相对应变量 P_k(k=1,2,…,9)来近似表达。自1917年以来,9个孕震区的共10次大震都发生在 P_k≤0.08的区里,而不发生在>0.08的区;对每个孕震区,P_k>0.08的期间是安全期,反之为危险期。这可作为川滇地震危险区的一个参考判据。   << 更多相关文摘 
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