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A method has been proposed to calibrate the linearity errors of wideband digitizer at frequencies up to 100 kHz. The method is based on the use of self-calibrated inductive voltage divider with ratio of 2n:1. The linearity errors in phase angle and amplitude of two channels of the digitizer have been calibrated against 1 V. The measurement has been done at the input voltage ranges from 1 V down to...
The synthesis of isobutyl propionate from prop ionic acid and isobutyl alcohol with rare earth solid super acid SO42-/TiO2/La3+ as environmentally friendly catalyst was studied. The influential factors of reaction were investigated. Results show that the appropriate conditions are: molar ratio of isobutyl alcohol to prop ionic acid was 2 : 1; Catalyst's weight was 0.7g(the amount of 0.1 molar prop...
In this paper, some three and four complexes of holmium have been synthesized. Using agar dilution method, the bacteriostasis activity of the holmium complexes against Escherichia coli, Staphylococcus aureus, Bacillus subtilis are mensured and their minimal inhibitory concentration (MIC) to the growth of bacterium have been determined. The result shows that their complexes of holmium have bacteriostasis...
To improve the biological treatment effect of paper-making wastewater, the screening of strains degrading wastewater and its application were carried out. Twelve strains were separated from biological aerated filter; two efficient degrading strains (D1, E2) were screened based on the degradation rate of CODcr. The D1, E2 were selected to apply in wastewater treatment experiment and the results showed...
As the capability of an individual Web service is limited, it's necessary to create new functionalities with existing Web services. Web services composition is the ability to create a new value-added service by incorporating some existing Web services together. An important challenge for Web services composition is how to ensure the correctness and reliability of the WS-BPEL (Web services business...
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