I^2C总线彩电及其特点

I^2C是英文Inter Intergrated-Circuit(内部集成电路)的缩写，也可把I^2c总线直观地看作集成电路间互联总线。I^2C总线系统的特点有：主控CPU通过两根I／O线与所有的外嗣电路进行信息交换，包括一条串行数据线SDA(DATA)及一条串行时钟线SCL(CLK)；总线上挂接的每一个受控外围器件都必须设有地址脚和总线接口电路，接口电路主要由解码器、D／A     

卤代苯甲酸-TPTZ铽配合物的合成、表征及荧光性能

分别以对溴苯甲酸和对碘苯甲酸为第一配体,2,4,6.三吡啶基三嗪(TPTZ)为第二配体,以铽为中心,La3+、Y3+、Cd3+为掺杂离子,合成了8种铽及其掺杂配合物,对其进行了C、H、N元素分析及稀土络合滴定、紫外光谱、红外光谱和荧光光谱测定.推测配合物的组成为:Tb(P-BrBA)3(TPTZ)·2H2O和Tb(P-...     

A computer model of pulse wave and input impedance in human arteries

To predict the propagation of pressure and flow pulses in arterial system and the variation of vascular input impedance, a branched and tapered tube model is studied through one-dimensional transient flow analysis. Coupling the continuity and momentum equations yields a group of quasilinear hyperbolic partial differential equations which can be solved numerically by using the method of characteristics. Several boundary conditions of the arterial system are also simplified suitably. The propagation of the pulses of the arterial system and the vascular input impedance is calculated on computer by using the dimensions and the physiological data of the arterial system. The results point out that the pressure and flow pulses of the arterial system and the vascular input impedance produced by this theoretical model is consistent quite well with the experimental results published.     

人体体动脉脉搏波和输入阻抗的计算机模拟

本文通过对具有连续出流的分支、锥削管的一维非线性瞬态流分析,研究了人体体动脉中压力和流量脉搏波的传输和血管输入阻抗的变化规律.通过耦合支配着动脉中脉搏波传播的连续性方程和运动方程,文章导得了一组可以用特征线法求解的拟线性双曲型偏微分方程组.同时,对血管系统中常见的几种边界条件进行了适当的处理.文章利用血管几何参数和物理参数的生理实验数据,对血管系统的脉搏波传播和输入阻抗进行了计算机模拟.结果表明,从本文提出的分析模型得到的压力和流量波形以及输入阻抗与有关文献公布的实验结果吻合得相当好.     

A COMPUTER MODEL OF PULSE WAVE AND INPUT IMPEDANCE IN HUMAN ARTERIES

To predict the propagation of pressure and fiow pulses in arterial system and the variation of vascular input impedance, a branched and tapered tube model is studied through one-dimensional transient flow analysis. Coupling the continuity and momentum equations yields a group of quasilinear hyperbolic partial differential equations which can be solvednumerically by using the method of characteristics. Several boundary conditions of the arterial system are also simplified suitably. The propagation of the pulses of the arterial system and the vascular input impedance is calculated on computer by using the dimensions and the physiological data of the arterial system. The results point out that the pressure and flow pulses of the arterial system and the vascular input impedance produced by this theoretical model is consistent quite well with the experimental results published.     

杂多酸催化剂上甲醇转化为烃的研究

Keggin型杂多酸化合物的热稳定性高,又具有强酸性和氧化还原性,故其催化作用很引人注目.由于其结构上的特点,反应物分子能出入催化剂的体相内部,因而体相中的活性中心也起作用,被称作“假液相”催化.杂多酸用于甲醇催化转化为烃的反应有不少研究.据报道,12-钨磷酸(H_3PW_(12)O_(40))和12-钨硅酸(H_4SiW_(12)O_(40))、12-钨磷酸铜(Cu_(3/2)PW_(12)O_(40))对甲醇转化反应都有相当高的活性.1,4-二嗪和1,3,5-三嗪的12-     

用循环图构造可靠通讯网络

本文得到了５度、７～１５度连通循环图的连通度等于其度数的充要条件。从而可用循环图构造可靠通讯网络。     

硫氮共掺杂碳量子点荧光识别Pb~(2+)

以L-半胱氨酸为碳源、硫源及氮源,一步水热法制得水溶性好、稳定性高的硫氮共掺杂碳量子点SN-CDs。基于Pb~(2+)对其荧光的淬灭作用,构建了高选择性与高敏感度的荧光探针,可应用于Pb~(2+)的快速检测。运用透射电镜、紫外-可见吸收光谱、Fourier红外光谱和荧光光谱表征了SN-CDs的结构及光学性能。结果表明,Pb~(2+)浓度在2～50μmol/L范围内,与SN-CDs的荧光淬灭率之间呈良好的线性关系,相关系数为0.9992,检出限为0.2μmol/L。方法用于自来水中Pb~(2+)的测定,回收率为94.7%～100.7%。