The ratio test and the root test are two widely used convergence tests for positive series.

比式判别法和根式判别法是对正项级数收敛性进行判别的两种广用的方法。

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This paper comparably tests different LED light source and optical convergence system, analyzes the condensing performance and designs the structure of TIR lens.

对各种LED光源和光学会聚系统进行了对比测试，并对其聚光性能进行了分析，设计了一种全内反射透镜（TIR透镜）结构。

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ATP simulation and tests of the real recording oscillograph data of fault occurred in East China Power Grid prove that the model has the advantages of high classification rate and convergence speed.

通过AT P仿真及华东电网实际故障录波数据的测试，结果表明该模型具有很高的识别率和收敛速度。

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Like the countries already in the monetary union, Britain will have formally to pass the convergence tests set by the Maastricht treaty of 1992.

ECONOMIST: Britain and the euro

So if the tests boil down to convergence, where stands Britain?

ECONOMIST: The single currency

The nationalist Convergence and Union coalition wants a burqa ban and to make future immigrants take Catalan-language tests.

ECONOMIST: Spain and immigration