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排序方式: 共有174条查询结果,搜索用时 15 毫秒
171.
Ariel L. Lombardi Paola Pietra 《Numerical Methods for Partial Differential Equations》2012,28(6):1747-1777
New discontinuous Galerkin schemes in mixed form are introduced for symmetric elliptic problems of second order. They exhibit reduced connectivity with respect to the standard ones. The modifications in the choice of the approximation spaces and in the stabilization term do not spoil the error estimates. These methods are then used for designing new exponentially fitted schemes for advection dominated equations. The presented numerical tests show the good performances of the proposed schemes. © 2011 Wiley Periodicals, Inc. Numer Methods Partial Differential Eq 2011 相似文献
172.
Structural Chemistry - The alkaloid agelastatin A (AGA) has raised great interest for its potent antitumor activity and intriguing molecular structure. This led to multifarious total syntheses and... 相似文献
173.
Anna Gumieniczek Paulina Mączka Tadeusz Inglot Rafał Pietraś Elżbieta Lewkut Kinga Perczak 《Central European Journal of Chemistry》2013,11(5):717-724
A new HPLC method was developed for the determination of amlodipine and perindopril in their binary mixture as a part of a routine control of combined formulations. For the first time an HPLC method was used for an in vitro dissolution study of tablets containing the above drugs. The presented method was validated to meet official requirements and this validation included specificity, stability, linearity, precision and accuracy. Chromatography was carried out using a LiChrospher RP-18 column, a mixture containing acetonitrile and phosphate buffer of pH 3.0 (50:50, v/v) as mobile phase and UV detection at 225 nm. The dissolution test was performed using 900 mL of phosphate buffer at pH 5.5 containing 1% cetylpyridini chloride (CPC) at 37°C and 75 rpm, using the paddle method. Robustness procedure was done according to the plan defined by the Plackett-Burman design. The effects of acetonitrile content, pH of the buffer and flow rate of the mobile phase, column temperature, pH and CPC content in the dissolution medium as well as rotation speed of the paddle were considered. After that, both graphical and statistical methods were used for identification of significant and non-significant effects. 相似文献
174.
Komsta Łukasz Smardz Patrycja Pietraś Rafał Skibiński Robert Gumieniczek Anna 《平面色谱法杂志一现代薄层色谱法》2014,27(3):229-232
JPC – Journal of Planar Chromatography – Modern TLC - The retention (RM) values of nine one-point adsorption model compounds: diphenylamine, indol, 2-naphtol, 1-naphtol, 1-naphtylamine,... 相似文献