RESULTS: The influence of liquid flow rate (Q(L)) from 2-4 L min(

RESULTS: The influence of liquid flow rate (Q(L)) from 2-4 L min(-1), gas flow rate (Q(G)) from 30-70 L min(-1), H2S concentration in the H2S-air feed mixture from 5-15 ppm, and Ce(III) pre-mediator concentration in the electrochemical cell from 0.1 – 1 mol L-1 on H2S removal

efficiency were investigated. Both liquid and gas flow rates influenced the removal efficiencies, but in opposite directions. Nearly 98% H2S removal was achieved when the concentration of Ce(IV) mediator ion in the flowing scrubbing liquid reached 0.08 mol L-1.

CONCLUSIONS: The new MEO method proved promising for H2S removal, achieving high removal efficiency. integration of the electrochemical cell with find more the scrubber set-up ensured continuous regeneration of the mediator and its repeated reuse for H2S removal,

avoiding use of additional chemicals. Since the process works at room temperature Dinaciclib purchase and atmospheric pressure utilizing conventional transition metal oxide electrodes more commonly used in industrial applications, it is also safe and economical. (C) 2008 Society of Chemical Industry”
“Previous reviews of randomised controlled trials (RCTs) for low-back pain (LBP) have failed to identify any positive trend in study quality with more recent years of publication. This study aimed to identify and describe trends over time in the study design characteristics and risk of bias in chronic LBP trials performed over the past 30 years.

One fifty-seven randomised trials of interventions for chronic LBP were extracted from recently published systematic reviews. The reviews included RCTs on physical and rehabilitation interventions, injection therapy and denervation procedures, complementary and alternative therapies and pharmacological interventions for chronic LBP. Study level data were extracted and analysed

for trends associated with year of publication.

Overall, the mean sample size in the RCTs was 141 (median 70; range 17-3093). There was a slight increase in the median number of risk of bias criteria fulfilled from trials published prior to 1995 to those published after 1996. The analysis showed that in more recent years RCTs of medical interventions were more likely to be successfully blinded than RCTs of non-medical interventions.

The continuing uncertainty regarding the efficacy of many interventions for chronic LBP again stresses the need for large RCTs with low risk of bias. Further research is needed into specific risks of bias within the RCTs for chronic LBP and the effect they have on the plausibility of the results.”
“BACKGROUND: The powder reaction moulding process uses a reactive monomer as carrier and binder for the moulding of metal or ceramic powders.

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