而行星的宜居指数（PHI）则考察另外的一组因素，如该星球是否有岩石或冰冻的表面，是否有大气层或磁场的存在。
The PHI looks at a different set of factors, such as whether the world has a rocky or frozen surface, whether it has an atmosphere or a magnetic field.
本文对电磁场问题的理论计算中常遇到的含有指数函数和指数积分函数的积分，得出了解析表达式。
The analytical expressions are derived for the integrals containing exponential and exponential integral which appear frequently in electromagnetic field problems.
同时发现电流密度与磁场间存在指数关系，表明样品中的钉扎势垒与电流密度之间存在对数关系。
The critical current density depends exponentially on magnetic field, which indicates that there is a logarithmic potential well U in Bi2212 crystals.
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