plus or minus 正负号is greater than 大于号is less than 小于号is equal to 等号is not equal to 不等号is similar to 相似符号is congruent to 全等号infinity 无限符号is greater than or equals 大于等于号is less than or equals 小于等于号is equivalent to 等价号implies 蕴涵符号theta 角度符号empty ...
向量算子(?/?x)i + (?/?x)j + (?/?x)k, 读作 "del" f f的梯度;它和 uw 的点积为f在w方向上的方向导数 w 向量场w的散度,为向量算子? 同向量 w的点积, 或 (?wx /?x) + (?wy /?y) + (?wz /?z) curl w 向量算子 ? 同向量 w 的叉积 ×w w的旋度,其元素为[(?fz /?y) -...
Clearly, the feedback is acting to regulate the output of the integrator towards zero, and the only way that can happen over time is if the average current into the integrating capacitor C equals zero. Thus, the circuit forces the average of vi Rf to equal the average of u/Rj • ...
q_9&= \frac{3}{2}\;({\bar{s}} d)_{v-a}\sum _{q=u,d,s,c,b,t}e_q({\bar{q}} q)_{v-a}\\ q_{10}&=\frac{3}{2}\; ({\bar{s}}_{\alpha } d_{\beta })_{v-a}\sum _{q=u,d,s,c,b,t}e_q\; ({\bar{q}}_{\beta }q_{\alpha })_{v-a} \end{al...
The comparator minus input is a virtual ground. Capacitor C' is charged and discharged by the current sources so that the potential at the input has added to it or subtracted from it a capacitor potential such that the resulting level at the minus input of the comparator equals the reference...
The areas of the two terrestrial habitats minus any open-water areas among them were used to calculate the splay growth rates of the areas that were at times supportive of submergent vegetation [46]. For 22 years, the two Brant Pass terrestrial Water 2023, 15, x FOR PEER REVhIaEbWitats...
Binomial probability that X equals a: P(X=a)=(na)πa(1−π)n−a=n!a!(n−a)!πa(1−π)n−a=1×2×3×⋅⋅⋅×n(1×2×3×⋅⋅⋅×a)[1×2×3×⋅⋅⋅×(n−a)]πa(1−π)n−a The notation n! is n factorial, the product of the numbers ...
And the Shields parameter equals τ* = 0.021. The particle Reynolds number equals Re* = 16. For these values, Fig. 8.4a indicates that the flow conditions are at the onset of sediment motion. Sediment transport on the beach will be small. Discussion An example of destructive Aeolian ...