LEF：无负载效应

“Load Effect Free”在学术及电子工程领域常被简称为LEF，以方便快速书写和日常使用。该术语的中文释义为“无负载效应”，用于描述电路或系统在无外部负载影响下仍能保持稳定运行的特性。这一概念在分析器件性能、优化设计时尤为重要。

Conclusion The disorder of intracellular Ca 2 + homeostasis may play an important role in the etiology of muscle injury induced by static load. Effect of Danshen Injection on Cytosolic Free Calcium Concentration in Human Erythrocytes
丹参注射液对人红细胞胞浆Ca~（2+）浓度的影响
Embarking from the most basic torsion problem, the calculation formulas considering the free torsion rigidity of the internal force and the deformation of member under simple load are deduced. From those formulas, the second-order effect rule of free torsion rigidity is sought for.
从最基本的扭转问题出发，推导简单荷载作用下的考虑了自由扭转刚度的内力和变形计算公式，从中寻找出自由扭转刚度的二阶效应规律。
After the analysises above, it found the size effect laws on both load stress and temperature warping stress, as well as laws of stress reduction effect of dowel bars and collars on plates with 4 free edges.
经分析，得出了四边自由的路面板荷载应力和温度翘曲应力的尺寸效应规律，以及传力杆或水平拉杆对非自由板的应力折减作用。

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