负差 meaning in English

minus tolerance
◇负差效应 negative difference effect

Test standard for evaluating the simulated wind uplift resistance of roof assemblies using static positive and or negative differential pressures
用静态正和或负差压评价屋顶组件耐模拟风吹起的试验标准
A new method for moving target detection based on positive and negative difference maps is presented . compared with the basic frames difference approach , it gets two difference maps - positive difference map and negative difference map at the same time . making use of the relativity of the two maps , the moving objects can be detected easily and exactly
2 .提出了一种基于正负差图像的运动目标检测算法,较之以往的差图像法,该方法同时获得正差图像和负差图像,通过两幅差图像之间的关联性,检测出运动目标。