By using the density theory of theories of Numbers, the article gives the density discrimination method determining the convergence and divergence characteristic of the positiveterm series.
The present paper introduces the optimized design of valve springs of the internal-combustion engine by the duality method of the geometric programming with the positiveterm equations of constraint.
本文对内燃机汽门弹簧进行优化设计,采用了约束正定式几何规划对偶法。
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Organic fertilizers will have very positive results in the long term.