岩质边坡楔形体破坏的离心模型试验方法研究

叙述了岩质边坡楔形体破坏的离心模型试验,较详细地介绍了试验中模型材料选择和试块加工的过程,最后采用Hook方法和机动位移法对离心模型试验的结果进行了分析,得到了预期的试验成果。     

某坝区滑坡变形破坏特征及其稳定性预判

雅砻江中游某巨型滑坡距离拟选坝址仅1.3 km,目前滑坡体上有裂缝发育,滑坡的整体稳定性对于坝址的选择具有颠覆性的影响。因此,在概要介绍滑坡地质特征基础上,对滑坡体上裂缝发育分布特征及其成因机理探讨,对裂缝的产生是由整体还是由于局部导致给出明确回答,进而依据滑坡工程地质特征及定量计算对蓄水后滑坡的整体稳定性作出预测。     

车辆发动机怠速抖动故障规律分析

运用机械振动理论分析了发动机机体正常振动时的激振源和振动形式。指出，由于发动机的各种故障引起个别气缸气体作用力减小，导致总的反倒力矩平衡性恶化，出现怠速抖动。总结出故障规律，归纳出五个方面的故障类别。最后，提出了查排故障的一般方法。     

离散Hopfield神经网络在混烧控制系统故障诊断中的应用

给出了离散Hopfield神经网络结构和模型．利用Hopfield神经网络的演变过程是一种计算联想记忆的过程,它适用于正交(或近似正交)模式的记忆性质,给出了一种Hopfield神经网络的双向联想记忆模式的记忆矩阵构造方法,并提出了一种改进的基于Hopfield神经网络的控制系统故障诊断的算法,利用此算法实现实时检测混烧控制系统的故障和异常,对混烧控制系统的调节器和阀门进行故障诊断和故障信息提示．     

石油压力管道断裂破坏分类及其评定方法

通过对辽河油田的石油压力管道进行调查分析表明，石油压力管道中分为５类：腐蚀破坏、疲劳破坏、蠕变破坏、冲刷及磨损减薄、脆性破坏、尽管破坏类型和引起破坏的原因具有多样性和复杂性，但最终的破坏形式毕为断裂失效，针对这一失效形式进一步研究，提出了２种切实有效的评定方法，即虚裂纹扩展法和裂纹形状跟踪法，这２种方法计算较准确，操作容易，与实验符合得很好，取得了工程上满意的效果。     

Accumulated snow and summer temperature – critical factors for recruitment to high mountain populations of brown trout (Salmo trutta L.)

Abstract –  In lake Krokavatn, 1236 m a.s.l., only six strong year-classes of brown trout appeared during the period 1970–2003. Eleven year-classes were missing during the same period. The observed recruitment failure depended significantly on the accumulated snow depth in April, whereas the mean August temperature in the year of birth was significant for the appearance of strong year-classes. Size of the young-of-the-year (YOY) trout at onset of the winter seemed to be crucial for survival. Also little snow and low temperatures during the winter may have led to recruitment failure, as small nursery streams may freeze completely under such conditions, as happened during the winter of 1995/1996. Thus, the recruitment to brown trout populations in western high mountain areas of Norway seemed to be strongly affected by accumulated snow depth and summer temperatures. A climate change with more winter precipitation, as predicted for the present century, may therefore be detrimental to recruitment. However, warmer summers may increase recruitment to levels that lead to overpopulation, but also to establishment of brown trout populations at higher elevations than today.     

角点支承钢筋混凝土双向密肋楼盖破坏形态研究

在角点支承钢筋混凝土双向密肋楼盖试验的基础上,提出有关这种楼盖板—次肋和板—次肋—主肋的8种可能破坏形态,并分别推导了它们的极限荷载公式 当楼盖的几何尺寸和配筋等条件已知时,可以算得每种破坏形态的极限荷载值,其中,与最小极限荷载对应的破坏形态就是真实的破坏形态 通过一块5.46m×10.92m的两跨角点支承钢筋混凝土双向密肋楼盖短期荷载试验,将计算结果与试验结果进行了比较     

55例慢性肾功能衰竭患者糖化血红蛋白的检测

本文对55例慢性肾功能衰竭(CRF)患者作了糖化血红蛋白(GHb)检测,并同步检测了血红蛋白(Hb)、尿素氮(BUN)等指标。结果表明:(1)本组 GHb为103.6±24.3g/L,显著高于正常人的58.3±17.5g/L;(2)本组GHb与Hb、BUN等的相关分析结果未见有相关性。     

Role of caspase-3 dependent hepatocyte apoptosis in liver ischemia-reperfusion injury in cirrhotic rats

AIM:To investigate whether hepatocyte apoptosis is contributed to liver ischemia-reperfusion (I/R) injury and the relationship between liver caspase-3 activity and hepatocyte apoptosis in cirrhotic rats. METHODS:Liver ischemia-reperfusion is induced by Pringle maneuver. The cirrhotic rats were randomized into two groups: Group A: simple hepatic blood inflow occlusion (HBIO); Group B: HBIO + inhibitor, before HBIO, ZVAD-fmk 15 mg/kg was injected via dorsal penis vein; Group C: healthy rat, simple HBIO. The ischemia time was 30 min in these groups. Serum aspartate aminotransferase(AST), liver caspase-3 activity, and apoptotic hepatocytes were examined in the three groups. RESULTS: After 6 h of reperfusion, the liver caspase-3 activity was markedly elevated and reached its peak, which was statistically higher than that of before I/R . The same change occurred in hepatocyte apoptosis between 6 h of reperfusion and before I/R (20.9%±4.9% vs 0.5%±0.3%, P＜0.01). As the reperfusion prolonged, the caspase-3 activity and apoptotic hepatocyte decreased gradually. The 7th-day survival rate was 62.5% in group A. The serum AST, liver caspase-3 activity and apoptotic hepatocytes were significantly higher in group A than those in group B and C, representing the most severe liver injury among the three groups. CONCLUSION:Hepatocyte apoptosis is the major form of cell death in liver ischemia-reperfusion injury in cirrhotic rats. Hepatoctye apoptosis induced by I/R is caspase-3 dependent, and inhibiting caspase-3 can alleviate liver injury. The caspase-3 dependent hepatocyte apoptosis is highly contributed to the pathological phenomenon that the ischemic sensitivity of cirrhotic liver is higher than normal liver.