A method for simultaneous separation and determination of two coumarins,dicumarol and cyclocoumarol,in cosmetics by HPLC-diode-array detector(DAD) was developed.
So the absorbing wavelength is selected,the operating condition optimized,and the quantitative and qualitative determination method on Polyoxin B by HPLC-DAD established.
The diode intrinsic noise temperature of some milimeter Schottky mixer diode was measured and reviewed. A measurement method was described at room and cooled temperature.
Depth of field: with prqactices diode system (IDS), high-capacity ensures that the depth of field in the production of reliable. Autocompensation printing plate surface unevenness.
This paper shows that under certain conditons it is possible to diminish and even eliminate the nonlinear distorsion of a peak envelope detector by biasing the diode adequately.
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