微分环(differential ring)是带导子集的环。若环R有一个导子集合Δ，则Δ称为R的微分系，R称为有微分系Δ的环，或简称微分环或Δ环。设S是有微分系Δ的环R的子环，若S也是有微分系Δ的环，则S称为R的微分子环，或Δ子环，而R称为S的微分扩环。
... differential quotient 微分系数 differential ring 微分环 differential scattering 微分散射截面 ...
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微分环节 [自] differentiation element ; Derivative Element
一阶微分环节 First derivative element
二阶微分环节 Secondary derivative element
利用微分环节的稳定 derivative equalization
心导纳微分环 CADL ; Cardiac admittance differential loop
微分子环 [数] differential subring
微分多项式环 [数] differential polynomial ring
高子分多孔微环 Porous polymer beads
微分扩张环 [数] differential extension ring
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目的探讨心导纳微分环（CADL）检测在陈旧性心肌梗死（OMI）患者心功能评价中的作用。
Objectives To investigate the role of cardiac admittance differential loop (CADL) in evaluating cardiac function of the patients with old myocardial infarction (OMI).
目的：本项研究的目的是探讨脑导纳微分环快流入相和慢流入相面积和对血管弹性判定的诊断价值。
Purpose The aim of this study is to value the quick-slow inflow quadrant area IQAof ADL on the patients with hyper- tension and compared with the normal group.
分析了带微分环节的电压滞环的变环宽的原理，指出带微分滞环控制的脉宽调制(PWM)变换器可作为理想的可控电压源。
The paper analyzed the voltage hysteresis with differentiation elements, and pointed out that the PWM converter with differentiation hysteresis controls can be used as the ideal voltage source.
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