An optimum distribution condition of radio sources for the determination of Earth rotation parameters by means of VLBI technique was proposed and explained in detail.
本文提出了应用射电干涉测量的方法测七地球自转的三个参数时，源矢量的最佳分布条件。
Results The optimum condition and kinetic parameters are investigated in detail, a new negative catalytic spectrophotometry for determination of trace calcium in environmental water was established.
结果研究了该负催化褪色反应的最佳条件及动力学性质，建立了负催化光度法测定微量钙的新方法。
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