Based on production decline curve equation, through mathematical derivation, a kind of logarithmic type production decline curve equation is obtained.
在产量衰减曲线方程的基础上，通过数学推导，得到了一种对数型产量衰减曲线方程。
2
Through theoretical analysis of rheological properties of frozen soil, the logarithmic creep equation of frozen clay is established under complex stress state.
通过对冻土的流变特性进行理论分析，建立了冻黏土在复杂应力状态下的对数型蠕变方程。
3
According to the working principle of a excavator, this paper describes mathematically that the trace equation of digging processes is of logarithmic helix.