随机集值半闭1-集压缩映象的随机不动点指数

建立了随机集值半闭1-集压缩映象的随机不动点指数，为研究一类范围广阔的随机集值映象的随机不动点理论提供了方便的工具。     

利用狭义相对论导出毕奥－萨伐定律和安培定律

众所周知，毕奥－萨伐定律和安培定律是两个实验定律。由于普通物理课程的现代化问题已引起越来越广泛的关注［１］，为将近代物理思想引入普物教学，本文试图从狭义相对论出发对这两个定律进行推导。     

Meir－Keeler型压缩映射的公共不动点定理

改正文［１，２］中的错误，给出连续的Ｍｅｉｒ－Ｋｅｅｌｅｒ型压缩映射和非连续的Ｍｅｉｒ－Ｋｅｅｌｅｒ极限型压缩映射的公共不动点定理，推广文［１］所要推广的五十多个定理及文［３～５］中的主要结果。     

Banach空间中的广义Volterra积分方程

考虑Ｂａｎａｃｈ空间中形如：的广义Ｖｏｌｔｅｒｒａ积分方程，得到了关于此方程的Ｌｐ解的存在性、唯一性及对ｕ的连续依赖性的某些结果。     

压缩算子下线性方程组的非线性迭代算法

利用压缩映射定量，不动点原理及矩阵的相关性质，对求解一般线性方程组问题进行了研究，导出了一种求解线性方程组的非线性迭代算法。特点是：无需对矩阵进行各种变换及求逆等运算，能始终保持收敛性且收敛速度较快。仿真结果表明，该算法稳定，收敛速度快，且有实用价值。     

Minoxidil-induced cardiac hypertrophy in guinea pigs

To investigate whether during cardiac hypertrophy changes occur in contractile protein composition and in mechanical and energetic properties of the myocardium, contractile protein composition, isometric force and adenosine triphosphate (ATP) consumption were studied in control and hypertrophied guinea-pig hearts. Cardiac hypertrophy was induced by adding minoxidil (120 or 200 mg/l) to the drinking water. Protein analysis was performed by one-dimensional gel electrophoresis. The myosin heavy-chain (MHC) composition was determined in an enzyme-linked immunosorbent assay (ELISA). ATP consumption and force development were simultaneously measured during isometric contraction in chemically skinned trabeculae. Histochemical analysis of cross-sectional area of cardiomyocytes and interstitial space was performed on the left ventricular tissue of 200 mg/l minoxidil-treated and control guinea pigs. Minoxidil treatment (120 and 200 mg/l) significantly increased left ventricular dry weight normalized for body weight by 19 ± 4 and 24 ± 4%, respectively. No significant differences were found in the cellular cross-sectional area, while interstitial space was slightly decreased in minoxidil-treated hearts. In left ventricular trabeculae of 200 mg/l minoxidil-treated guinea pigs, ATPase activity was slightly less than in those of control guinea pigs, whereas force did not differ significantly. Calcium sensitivity of force and ATPase activity were not affected by minoxidil treatment. Gel electrophoresis revealed no difference in contractile protein composition, but a tendency towards a lower amount of α-MHC in the minoxidil-treated hearts was found in ELISA. Received 1 February 1999; accepted 15 March 1999     

多种群中立型时滞脉冲系统周期解的存在性

运用K-集压缩算子拓扑度抽象连续定理和某些分析技巧,在一定的条件下,得到多种群中立型时滞脉冲系统周期解的存在性.     

高海拔地区体检人群心脏彩超基础数据的测量及其对比分析

目的:通过对高海拔地区不同年龄组之间、以及高海拔与低海拔老年组体检人群心脏彩超基础数据进行对比分析,观察各年龄段男女心脏结构和功能基础数据变化规律,为降低心脏疾患的发生,提供可参考影像数据.方法:采用实时超声心动图,对来自高海拔和低海拔地区健康体检者进行心脏形态学及功能学数据测量,采用统计学方法对高海拔男、女组各年龄段之间,以及对高海拔与低海拔老年男、女组体检人群测量数据进行对比分析,得出相应结果.结果:男、女性主动脉根部最大径、肺动脉最大径、左房前后径、右室流出道最大径及室间隔厚度最大径随着年龄增长逐渐增大,60岁以上组增大最为显著,与小于30岁组比较具有明显统计学意义.男性主动脉最大流速及压差、MV-E/A、TV-E/A、SV(每搏输出量)等指标,随着年龄增长主动脉最大流速逐渐下降,压差逐渐加大;MV-E/A及TV-E/A值降低趋势.高海拔与低海拔老年组体检人群男女两组比较室间隔厚度没有明显统计学差异,余指标均有差异.结论:超声心动图能够准确测量心脏结构和功能的基础数据.在高海拔地区随着年龄的逐渐增大心脏功能逐渐降低、尤其是老年组与平原地区相比具有差异,但差异不显著.     

基于硫化钼量子点的心肌肌钙蛋白Ⅰ无标记型电化学发光免疫传感检测

基于硫化钼量子点(MoS_2 QDs)/过二硫酸钾(K_2S_2O_8)电化学发光(ECL)体系,构建了灵敏检测心肌肌钙蛋白Ⅰ(cTnⅠ)无标记型免疫传感器新方法.将发光材料MoS_2 QDs与还原氧化石墨烯(rGO)复合形成MoS_2 QDs-rGO纳米复合物,然后组装构建传感器.在优化条件下,对cTnI检测的线性范围为1.0×10~(-9)～1.0×10~(-4) g/L(R=0.998),检出限为4.9×10~(-10) g/L(R_(SN)=3).将提出的方法应用于实际人血清样品中cTnⅠ含量的测定,RSD在1.0%～2.6%范围,加标回收率在98.0%～110.0%之间.讨论了反应机理.     

收缩临界κ连通图中阶较小端片的基数

设G是收缩临界κ连通图,κ=4q r(0≤r≤2,q≥2),证明如果G的原子A的阶为q-1,则G中存在另一个与A不相交的端片B,使得B≤q.