However, finishing well-known simplification steps, an analytic formula of pressure and flow in a pipe can be given via the Weymouth equation [1], Chapter 6. begin{aligned} p_{v}^{2} - p_{u}^{2} = frac{L_{a} lambda _{a} R_text {s}z_a T}{A_{a}^2D_{a}}|q_{a}^|q_{a}^qquad forall ain A_{text {pi}}end{aligned} (6).
38, 39 Low BP will decrease ocular perfusion pressure by the dynamic formula of pressure, 40 where the corresponding result is the reduction of OBF, and thus increases the risk of development or progression of NTG.
References [69, 70] adopt the formula of wind pressure in relevant standards as the excitation on the catenary, and the wind-induced vibration and its effect on pantograph catenary interaction are investigated.
The analytical formula for pressure of concrete mixtures is worked out and dimensionless factors in this formula are determined mathematically.
Moreover, an alternative formula for pressure computation is designed from the second order moment of the distribution function.
After the variations of mean, standard deviation and non-Gaussian peak factor are considered, an innovative and analytical PDF formula of extreme wind pressure coefficients for multiple samples, which is expressed as a function of the JPDF of mean, standard deviation and the PDF of non-Gaussian peak factor, is presented in this paper.
Taking several facts into account, including sclera compliance, Friedland published a formula for a change of pressure induced by certain changes of intraocular volumes: (1) Δ p (t ) ≈ 2 α p r Δ v (t ), where Δ p t) = change in pressure (mmHg), p = pressure (mmHg), α = elastic constant (cm−2), Δ v t) = change in volume (μL), and r = radius (cm) [ 15].
In addition, since the differential pressure formulas sustained by the seal in most literature are inaccurate or incorrect, we precisely deduced and obtained the differential pressure formula of magnetic fluid sealing before we tested the differential pressure sustained by the seal and the influence of rotation speed on vacuum degree in the test platform.
According to these formulae, the influencing factors of pressure loss on the horizontal section are diameter of casing pipe, production rate, and length of horizontal section.
Based on the hydro-fracturing mechanism and process, the reasonable water pressure is theoretically analyzed, and then the pressure parameter of hydro-fracturing applicated in the low permeability outburst coal seam with high methane is obtained, finally the reasonable pressure formula of water injection is obtained.
This gives the number density N of air molecules inside a bubble of a radius r begin{aligned} N=N_oleft( 1+frac{r_o}{r}right), end{aligned} (5)and the parameters of this formula at pressure (p=1) atm and room temperature are: (N_o = 2.46times 10^{19},mathrm{cm}^{-3},upmu1.44,upmathrm{m}{mathrm{m}
