Effect of Molecular Additives on the Ignition of Methane–Air Mixtures

Combustion, Explosion, and Shock Waves - The ignition of methane–air mixtures with additives of ClF5, ClF3, OF2, and H2O2 (additive content in the mixtures  $$\le$$ 1%) is studied by...     

用于蛋白快速分离的1-mm内径的高效聚合物整体材料

多年来,整体技术已经成功地从概念阶段发展到表征良好且可重复的商用阶段。不同的整体柱化学材料,包括阴离子交换剂、阳离子交换剂和在ProSwift线性整体柱的反相功能基团,均可用于多种蛋白质的分离。与更大尺寸的色谱柱相比,1-mm内径的色谱柱在灵敏度提高和使用方便二者间达到了很好的协调。由于背压较小,这些整体柱可以在高动力学流速下运行,从而可以在标准的分析型色谱仪器上使用,而不需要微柱或者毛细管柱高效液相色谱系统。     

Capillary ion chromatography at high pressure and temperature

The application of high pressure and temperature in ion chromatography (IC) can significantly improve the efficiency and reduce the analysis time. In this work, the kinetic-performance limits of capillary IC columns with inner diameters of 400 μm packed with 4 and 7 μm macroporous anion-exchange particles were investigated employing a capillary ion-exchange instrument allowing column pressures up to 34 MPa and column temperatures up to 80 °C. Plate heights below 10 μm could be realized using capillary columns packed with 4 μm particles. Compared to conventional IC using 7 μm particles and pressures up to 21 MPa, a 40% improvement in plate number could be achieved when working at the kinetic performance limits at 34 MPa and using columns packed with 4 μm particles. Using coupled columns with a total length of 400 mm, a mixture of seven anions was separated within 7.5 min while yielding 20?000 plates. Increasing the temperature improved the performance limits when operating in the C-term region (for fast IC separation using columns <75 cm). Temperature also affected the retention properties and hence the selectivity. At higher temperature, retention for monovalent ions was mainly governed by ion diameter. An increase in retention with temperature was observed for small ions, and there was a decrease for ions having a larger diameter. The retention factor for divalent and trivalent anions increased with temperature.     

An Effective Pulsed-Periodic Chemical HF(DF) Laser

Instruments and Experimental Techniques - A working process is proposed for an HF(DF) laser, in which evacuation of the reactor is completely excluded. The workflow consists of the following...     

Biometric research in the cytomorphological diagnosis of endometrial lesions

Morphometrical and optical density (including DNA content) parametres of nuclei of the endometrial epithelial cells in smears of endometrial aspirates obtained from 57 women without endometrial disorders with hyperplastic, precancer conditions and endometrial cancer have been measured by using television image analyzer IBAS-2. Biometrical data have demonstrated a good correlation with cytomorphological diagnostic criteria and in 85.7% they have facilitated discrimination of the normal and hyperplastic epithelium from precancer and high differentiated endometrial cancer.