A three-dimensional suspended sediment model （SED） developed by the present authors is coupled with the combinatorial model of COHERENS （Luyten et al., 1999） （the three-dimensional coupled hydrodynamical-ecologic...A three-dimensional suspended sediment model （SED） developed by the present authors is coupled with the combinatorial model of COHERENS （Luyten et al., 1999） （the three-dimensional coupled hydrodynamical-ecological model for Regional and Shelf Seas） and SWAN （Holthuijsen et al., 2004） （the third generation wave model）. SWAN is regarded as a subroutine of COHERENS and gets time- and space-varying current velocity and surface elevation from COHERENS. COHERENS gets time- and space- varying wave relevant parameters provided by SWAN. Effects of wave on current are applied in bottom shear stress, wave-induced depth-dependent radiation stress and surface drag coefficient calculation. At the same time, the damping function of suspended sediment on turbulence is introduced into COHERENS. So the sediment model SED has feedback on circulation model COHERENS. The SED obtains current associated parameters from COHERENS. Then a coupled hydrodynamic-sediment model COHERENS-SED being able to account for interaction between wave and current is obtained. COHERENS-SED is adopted to simulate three-dimensional suspended sediment transport in the Huanghe River delta. In terms of simulation results, there is obvious difference between top and bottom layer of wave-induced longshore current. The values of time series of sediment concentration gotten by COHERENS-SED have, generally, an accepted agreement extent with measurement. Significant wave heights and wave periods obtained by COHERENS-SED show that wave simulation case with currentts effect can give better agreement extent with measurement than case without current＇s effect. In the meantime, suspended sediment concentration distributing rule obtained by COHERENS-SED is similar to former researches and measurement.展开更多
目的:建立盐酸雷尼替丁胶囊溶出度的测定方法。方法:采用HPLC法测定盐酸雷尼替丁胶囊溶出度,色谱柱为JADE PAK C_(18)(4.6 mm×250 mm, 5μm),流动相为0.1%甲酸的乙腈溶液-5 mmol·L^(-1)甲酸铵溶液(10∶90),柱温为35℃,波长为3...目的:建立盐酸雷尼替丁胶囊溶出度的测定方法。方法:采用HPLC法测定盐酸雷尼替丁胶囊溶出度,色谱柱为JADE PAK C_(18)(4.6 mm×250 mm, 5μm),流动相为0.1%甲酸的乙腈溶液-5 mmol·L^(-1)甲酸铵溶液(10∶90),柱温为35℃,波长为314 nm。结果:雷尼替丁在27.189~203.91μg·mL^(-1)范围内,线性关系良好(r=0.999 8),平均回收率为100.3%,RSD为0.6%(n=9)。测定13家企业158批次样品,其中56批次与参比制剂溶出行为不一致。结论:该方法经方法学验证,可用于盐酸雷尼替丁胶囊的溶出度测定。展开更多
基金supported by 973 Project "Land-Sea interaction and its effect on the environment in the typical estuaries and offishore areas of China" under contract No. 2002CB412408Natural Science Foundation of Shandong Provinceunder contract No. Q2007E05
文摘A three-dimensional suspended sediment model （SED） developed by the present authors is coupled with the combinatorial model of COHERENS （Luyten et al., 1999） （the three-dimensional coupled hydrodynamical-ecological model for Regional and Shelf Seas） and SWAN （Holthuijsen et al., 2004） （the third generation wave model）. SWAN is regarded as a subroutine of COHERENS and gets time- and space-varying current velocity and surface elevation from COHERENS. COHERENS gets time- and space- varying wave relevant parameters provided by SWAN. Effects of wave on current are applied in bottom shear stress, wave-induced depth-dependent radiation stress and surface drag coefficient calculation. At the same time, the damping function of suspended sediment on turbulence is introduced into COHERENS. So the sediment model SED has feedback on circulation model COHERENS. The SED obtains current associated parameters from COHERENS. Then a coupled hydrodynamic-sediment model COHERENS-SED being able to account for interaction between wave and current is obtained. COHERENS-SED is adopted to simulate three-dimensional suspended sediment transport in the Huanghe River delta. In terms of simulation results, there is obvious difference between top and bottom layer of wave-induced longshore current. The values of time series of sediment concentration gotten by COHERENS-SED have, generally, an accepted agreement extent with measurement. Significant wave heights and wave periods obtained by COHERENS-SED show that wave simulation case with currentts effect can give better agreement extent with measurement than case without current＇s effect. In the meantime, suspended sediment concentration distributing rule obtained by COHERENS-SED is similar to former researches and measurement.
文摘目的:建立盐酸雷尼替丁胶囊溶出度的测定方法。方法:采用HPLC法测定盐酸雷尼替丁胶囊溶出度,色谱柱为JADE PAK C_(18)(4.6 mm×250 mm, 5μm),流动相为0.1%甲酸的乙腈溶液-5 mmol·L^(-1)甲酸铵溶液(10∶90),柱温为35℃,波长为314 nm。结果:雷尼替丁在27.189~203.91μg·mL^(-1)范围内,线性关系良好(r=0.999 8),平均回收率为100.3%,RSD为0.6%(n=9)。测定13家企业158批次样品,其中56批次与参比制剂溶出行为不一致。结论:该方法经方法学验证,可用于盐酸雷尼替丁胶囊的溶出度测定。
