黄河大柳树坝址岩体结构模拟及边坡稳定性评价

研究了黄河大柳树坝址的岩体结构面参数。采用Ｍｏｎｔｅｒ－Ｃａｒｌｏ模模拟了该区岩体的结构面网络。     

Relationship between action potential, contraction-relaxation pattern, and intracellular Ca2+ transient in cardiomyocytes of dogs with chronic heart failure

Abnormalities of contractile function have been identified in cardiomyocytes isolated from failed human hearts and from hearts of animals with experimentally induced heart failure (HF). The mechanism(s) responsible for these functional abnormalities are not fully understood. In the present study, we examined the relationship between action potential duration, pattern of contraction and relaxation, and associated intracellular Ca²⁺ transients in single cardiomyocytes isolated from the left ventricle (LV) of dogs (n = 7) with HF produced by multiple sequential intracoronary microembolizations. Comparisons were made with LV cardiomyocytes isolated from normal dogs. Action potentials were measured in isolated LV cardiomyocytes by perforated patch clamp, Ca²⁺ transients by fluo 3 probe fluorescence, and cardiomyocyte contraction and relaxation by edge movement detector. HF cardiomyocytes exhibited an abnormal pattern of contraction and relaxation characterized by an attenuated initial twitch (spike) followed by a sustained contracture ('dome') of 1 to 8 s in duration and subsequent delayed relaxation. This pattern was more prominent at low stimulation rates (58% at 0.2 Hz, n = 211, 21% at 0.5 Hz, n = 185). Measurements of Ca²⁺ transients in HF cardiomyocytes at 0.2 Hz manifested a similar spike and dome configuration. The dome phase of both the contraction/relaxation pattern and Ca²⁺ transients seen in HF cardiomyocytes coincided with a sustained plateau of the action potential. Shortening of the action potential duration by administration of saxitoxin (100 nM) or lidocaine (30 μM) reduced the duration of the dome phase of both the contraction/relaxation profile as well as that of the Ca²⁺ transient profile. An increase of stimulation rate up to 1 Hz caused shortening of the action potential and disappearance of the spike-dome profile in the majority of HF cardiomyocytes. In HF cardiomyocytes, the action potential and Ca²⁺ transient duration were not significantly different from those measured in normal cells. However, the contraction-relaxation cycle was significantly longer in HF cells (314 ± 67 ms, n = 21, vs. 221 ± 38 ms, n = 46, mean ± SD), indicating impaired excitation-contraction uncou pling in HF cardiomyocytes. The results show that, in cardiomyocytes isolated from dogs with HF, contractile abnormalities and abnormalities of intracellular Ca²⁺ transients at low stimulation rates are characterized by a spike-dome configuration. This abnormal pattern appears to result from prolongation of the action potential. Received 22 January 1998; received after revision 16 March 1998; accepted 27 March 1998     

不变量与弦

通过对相对论性粒子作用量的不变量分析,直观地引出了弦作用量,说明不变量的极值导致运动方程。     

低能电子与Xe原子弹性碰撞的研究

本文利用新的关联极化势公式，并考虑相对论效应，在０．４～３０ｅＶ能量范围内，对低能电子与隋性气体重原子氙弹性碰撞相移和总截面进行了计算和研究，获得了满意的结果。     

政策势能对区域经济发展的作用

鉴于政策因素在我国区域经济发展中的特殊作用，提出了政策势能的概念，探讨了政策势能的集聚作用、增值作用、辐射作用、自强作用等四大作用机制及其作用过程，并着重分析了我国各个时期政策势能的分布状况及其影响．     

H_2O－N_2混合气体中H_2O分子光谱线的压力加宽谱线宽度系数的理论计算

本文利用我们耦合的Ｈ２Ｏ－Ｎ２相互作用等效势模型，计算了该系统在３００Ｋ—１０００Ｋ温度范围内的Ｈ２Ｏ分子被Ｎ２分子碰撞加宽的纯转动跃迁谱线宽度系数。计算结果与仅有的实验结果符合较好，表明我们的方法是有效的，结果是可靠的。     

双频充电法在宝源煤矿北斜井涌水联系中的应用

运用双频充电法的原理、方法以及几种不同产状和类型的椭球体的直流和双频充电的Ｕ１和曲线特征，讨论了在郴州宝源煤矿北斜井充电体上观测到的双频电位梯度曲线的特征、确定矿井涌水联系的地质效果以及双频充电法压制工业干扰的能力，为进一步治理井中涌水提供了可靠的依据。     

计算小分子静电势的量子化学方法

分子静电势（Molecular Electrostatic Potential)是研究分子的一个量子化学理论指数，它可以有来判断分子的整体性质，尤其是分子的反应活性,本文介绍了并评述了小分子的分子静电势的多种量子化学计算方法，对比给出了一些简单分子的分子静电势的计算结果，以便总结出各种方法的适用性。     

量子力学中力学量的复函数表示

本文讨论Ｂｏｈｍ的量子势因果解释。将Ｓｃｈｒｏｄｉｎｇｅｒ方程分离连续性方程和动力学方程，证明动力学方程不能用ｈ→０的极限方法过渡经典方程；将动量和动能表示成坐标的复函数形式，分析了实部、虚部的物理意义，证明量子势的本质是动能的组成部分而非相互作用势。     

MCO、MCONa~＋中CO催化活化的成键能研究（Ⅰ）

使用相对论赝势从头计算方法和成键能判据研究了模型化合物ＭＣＯ和ＭＣＯＮａ＋（Ｍ＝Ｆｅ，Ｎｉ）分子的电子结构，讨论了Ｍ对ＣＯ分子的活化作用及Ｎａ＋的助活化作用．由分子轨道成键能分析指出ＣＯ的次最高占据分子轨道１的消弱是使ＣＯ活化的关键，得出在模型化合物ＭＣＯＮａ＋（Ｍ＝Ｆｅ，Ｎｉ）中Ｎａ＋的引人消弱了ＣＯ的１轨道的成键强度，Ｎａ＋的助催化作用是通过电荷而非通过化学键实现的．