The present investigation is concerned with the reaction of barium and iron nitrates mixtures using three different molar ratios, 1:1 (Ⅰ), 1:2 (Ⅱ) and 2:1 (Ⅲ) at different temperatures as pointed out from the DTA d...The present investigation is concerned with the reaction of barium and iron nitrates mixtures using three different molar ratios, 1:1 (Ⅰ), 1:2 (Ⅱ) and 2:1 (Ⅲ) at different temperatures as pointed out from the DTA data. The reaction products exhibit 12 compounds namely, Ba(NO3)2, αFe2O3, Fe3O4, BaFeO3, BaFeO2.9, hexagonal BaFeO3-x, tetragonal BaFeO3-x, BaFe2O4, αBaFe2O4, Ba2Fe6O11, Ba5Fe14O26 and BaFe12O19. The formation of these products depend on the molar ratio between the reactants and the reaction temperature. The reaction products were studied by DTA and TG techniques and characterized by X-ray diffraction patterns, magnetic susceptibility data and scanning electron microscopy, SEM.展开更多
A nonlinear reaction-diffusion equation is studied numerically by a Petrov-Galerkin finite element method, which has been proved to be 2nd-order accurate in time and 4th-order in space. The comparison between the exac...A nonlinear reaction-diffusion equation is studied numerically by a Petrov-Galerkin finite element method, which has been proved to be 2nd-order accurate in time and 4th-order in space. The comparison between the exact and numerical solutions of progressive waves shows that this numerical scheme is quite accurate, stable andefflcient. It is also shown that any local disturbance will spread, have a full growth and finally form two progressive waves propagating in both directions. The shape and the speed of the long term progressive waves are determined by the system itself, and do not depend on the details of the initial values.展开更多
目的为临床合理使用拉莫三嗪(LTG)提供参考。方法检索中国知网、万方、维普、PubMed、Web of Science数据库自建库起至2023年11月的LTG治疗药物监测相关文献,从治疗窗、药物代谢动力学(简称药动学)特征,特殊人群(妊娠期女性、儿童、老...目的为临床合理使用拉莫三嗪(LTG)提供参考。方法检索中国知网、万方、维普、PubMed、Web of Science数据库自建库起至2023年11月的LTG治疗药物监测相关文献,从治疗窗、药物代谢动力学(简称药动学)特征,特殊人群(妊娠期女性、儿童、老年人等)药动学特征及代谢酶相关基因多态性对血药浓度的影响等方面,总结LTG治疗药物监测研究进展。结果LTG是治疗癫痫发作和双相情感障碍的药物,临床应用时需参考最新治疗窗;临床监测样本以血浆为主,头发和唾液也可作为非入侵样本;血药浓度检测的主要方法为液相色谱法,荧光光谱法和电化学传感器正逐渐被应用。LTG生物利用度约为98%,蛋白质结合率约为55%,达峰时间不受给药剂量限制;在与其他药物联用时要注意调整剂量。有潜在生育能力的癫痫女性用药首选LTG,用于老年癫痫时更适用于新发患者,对于癫痫患儿应重点监测血药浓度,以避免发生不良反应。尿苷5'-二磷酸-葡萄糖醛酸糖基转移酶是参与LTG代谢的主要酶,其相关基因的多态性也是血药浓度的重要影响因素。结论应采用合适的样本和方法检测LTG血药浓度,并关注不同人群及不同基因型,以预防严重不良反应的发生。展开更多
文摘The present investigation is concerned with the reaction of barium and iron nitrates mixtures using three different molar ratios, 1:1 (Ⅰ), 1:2 (Ⅱ) and 2:1 (Ⅲ) at different temperatures as pointed out from the DTA data. The reaction products exhibit 12 compounds namely, Ba(NO3)2, αFe2O3, Fe3O4, BaFeO3, BaFeO2.9, hexagonal BaFeO3-x, tetragonal BaFeO3-x, BaFe2O4, αBaFe2O4, Ba2Fe6O11, Ba5Fe14O26 and BaFe12O19. The formation of these products depend on the molar ratio between the reactants and the reaction temperature. The reaction products were studied by DTA and TG techniques and characterized by X-ray diffraction patterns, magnetic susceptibility data and scanning electron microscopy, SEM.
文摘A nonlinear reaction-diffusion equation is studied numerically by a Petrov-Galerkin finite element method, which has been proved to be 2nd-order accurate in time and 4th-order in space. The comparison between the exact and numerical solutions of progressive waves shows that this numerical scheme is quite accurate, stable andefflcient. It is also shown that any local disturbance will spread, have a full growth and finally form two progressive waves propagating in both directions. The shape and the speed of the long term progressive waves are determined by the system itself, and do not depend on the details of the initial values.
文摘目的为临床合理使用拉莫三嗪(LTG)提供参考。方法检索中国知网、万方、维普、PubMed、Web of Science数据库自建库起至2023年11月的LTG治疗药物监测相关文献,从治疗窗、药物代谢动力学(简称药动学)特征,特殊人群(妊娠期女性、儿童、老年人等)药动学特征及代谢酶相关基因多态性对血药浓度的影响等方面,总结LTG治疗药物监测研究进展。结果LTG是治疗癫痫发作和双相情感障碍的药物,临床应用时需参考最新治疗窗;临床监测样本以血浆为主,头发和唾液也可作为非入侵样本;血药浓度检测的主要方法为液相色谱法,荧光光谱法和电化学传感器正逐渐被应用。LTG生物利用度约为98%,蛋白质结合率约为55%,达峰时间不受给药剂量限制;在与其他药物联用时要注意调整剂量。有潜在生育能力的癫痫女性用药首选LTG,用于老年癫痫时更适用于新发患者,对于癫痫患儿应重点监测血药浓度,以避免发生不良反应。尿苷5'-二磷酸-葡萄糖醛酸糖基转移酶是参与LTG代谢的主要酶,其相关基因的多态性也是血药浓度的重要影响因素。结论应采用合适的样本和方法检测LTG血药浓度,并关注不同人群及不同基因型,以预防严重不良反应的发生。
