1️⃣ 首先,了解 pH Curve 测量的是锥形瓶内溶液的变化。例如,在 Weak Acid - Strong Base 的反应中,pH Curve 从酸性开始,因为锥形瓶内含有 CH3COOH。 2️⃣ 掌握 pH Curve 的四个关键点: 起点🏎:确定锥形瓶和滴定管中的溶液,以确定起始的主要物种,如 CH3COOH。 Buffer Region🌀:酸和共轭碱的比例...
Pythagorean hodograph curveNecessary and sufficient conditions are given for Pythagorean elements on unique factorization domains. Sets of easy to use polynomial coefficient based Pythagorean discriminant equations are derived for degree 2 polynomials on polynomial rings. Finally, obtained results are applied ...
结论:图上两条log cumulative hazard curve平行-->PH假设满足,PH假设满足-->图上两条log cumulative hazard curve平行,即图上两条log cumulative hazard curve平行是PH假设的充分且必要条件。 R代码如下: # log cumulative hazard plot plot(survfit(coxp...
结论:图上两条log cumulative hazard curve平行-->PH假设满足,PH假设满足-->图上两条log cumulative hazard curve平行,即图上两条log cumulative hazard curve平行是PH假设的充分且必要条件。 R代码如下: # log cumulative hazard plot plot(survfit(cox...
,强酸(碱)的滴定,滴定开始前 溶液的组成:HCl,滴定开始至化学计量点前 溶液的组成:HClNaCl,化学计量点时 溶液的组成:NaCl,化学计量点后 溶液的组成:NaClNaOH,滴定曲线 (titration curve),滴定开始,强酸缓冲区, pH小 随滴定进行,HCl , pH渐 SP前后0.1%, pH, 7、酸碱 pH=5.4 继续滴NaOH,强碱缓冲区,pH,...
此时需要在控制时间步长中使用*DEFIN_CURVE关键字,指定时间步长开始的初始时间。图中案例将5.00E-4 设成起点,一旦开始建立流动就能获取粒子速度,求解器将计算运行所需的时间步长。系统通常采用用户定义值和求解器默认定义值中较小的值运行,如5.00E-4或1.00E-4,然后逐渐增加到1.00E-1或1.00E-4。确保最初设置较小...
(d) Ru K-edge XANES for CRPO-2, RuO2and Ru foil. (e) EXAFS k2χ(R) spectra of CRPO-2, RuO2and Ru foil at Ru K-edge. (f) The spectra data and fitting curve of the Fourier transformed EXAFS signal for CRPO-2. Wavelet-transform images of (g) Ru foil, (h) RuO2 and (i)...
Fig.6 Drug release curve ( a. The release medium is pH5.3 artificial lung fluid; b. The release medium is pH7.4 artificial lung fluid) 由图可知,尼达尼布溶液和脂质体在pH7.4的人工肺液中释放量较低、释放缓慢、无法持续释放,可能是因为尼达尼布在pH为7.4的溶液中溶解度较低,呈现混悬液状态,有部分沉淀...
phosphate ion speciation used for pH calculations derived from SEIRA spectra absorption intensity; (c) absorption spectrum as a function of pH showing the two excitation wavelengths for fluorescent dye 6,8-dihydroxypyrene-1,3-disulfonic acid disodium salt (DHPDS); and (d) calibration curve for th...
For drugs displaying flip-flop kinetics, the terminal slope of the systemic concentration–time curve actually reflects absorption processes because absorption rate is not limited for highly permeable/highly soluble drugs. We expect that only class 3 and 4 drugs would demonstrate flip-flop kinetics. ...