同时，还导出了最大推力喷管这个泛函极值问题解存在的条件。
The condition of the existence of solution of functional extreme value problem applied to maximum thrust nozzle is also presented.
将沙丘背风坡的稳定性问题等价于一个双参变量函数的待定边界的泛函极值问题。
The problem of the lee slope stability of dune is equivalent to the extremal problem of a functional of two-variant function with a variable boundary in this paper.
本文为中低速内燃机配气机构的最佳设计，提供了统一的优化模型——条件泛函极值问题。
In this paper, we present a unified optimal model, i. e., the minimizing functional with constraints for the optimal design of critical and low velocity internal combustion engine valve mechanism.
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