Dynamic high-pressure processing technology

The complexity of analyte matrixes and the low level of selenium compoimds even in em-iched samples make speciation difficult, but the combination of separation processes with selenium-specific detection is a powerful approach. High sensitivity is vital, and MS with an atmospheric pressure ionization source, such as the ICP, has proved successful for HPLC detection. Selenium presents problems due to moderate ionization efficiency and isobaric interferences, although these can be partly overcome with high-resolution mass spectrometers or dynamic reaction cell (DRC) technology. Significant isotopic overlap from " °Ar2 on the most abundant isotope Se (49.6%) may necessitate measurement of the less abundant isotopes Se (8.6%) or Se (7.6%) of total selenium. 

Hartmann, C. (2002) Numerical simulation of thermodynamic and fluid-dynamic processes during the high-pressure treatment of liquid food systems. Innovative Food Science ej Emerging Technologies,... 

The sophisticated and more efficient CVD systems can be designed and constructed with the aid of computational fluid dynamics (CFD) and high performance computers. At the same time, control technology has advanced such that it becomes much easy to accurately control the CVD processing parameters, such as temperature, pressures and flow rate, etc ... 

It now appears that the dissolution dynamics of glassy polymers is at the very least a complicated process and its kinetics depends on many parameters of the solvent, the polymer and the processing condition. We have also found that one of the dynamical processes that strongly affect the dissolution kinetics of polymers with high Tg is the diffusion rate of the solvent into the polymer matrix which primarily depend on at least 4 factors polymer free volume and segmental mobility, solvent size and the osmotic pressure (chemical potential difference between the polymer solution and pure solvent). We believe that the above finding has important implication in resist technology. Positive... 

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