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Uncertainty of the Air Gauge Test Rig
Czeslaw Janusz Jermak,Michal Jakubowicz,Janusz Derezynski,Miroslaw Rucki 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.4
In the paper, the Advanced Back Pressure Experimental Rig is described and its measurement uncertainty is estimated. The test rig consists of mechanical, pneumatic and electronic systems, which are the main sources of uncertainty. Moreover, operator, environment, A/D conversion and data processing take part in the uncertainty propagation. To perform the uncertainty analysis, mutual impact of the system parts was considered, and the main stages of the data collection and processing were distinguished: setting of the assumed point, reading of its value, reading of the corresponding back-pressure, and the calculation of the examined air gauge characteristics. The analysis confirmed the uncertainty propagation with the largest uncertainty added by the approximation algorithms in the final stage of the process. The equipment variation was evaluated, too, and its value was found satisfactory, especially as it included the repeatability of the tested air gauge itself.
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Julio Wainstein,Zohar Landau,Yosefa Bar Dayan,Daniela Jakubowicz,Torsten Grothe,Tania Perrinjaquet-Moccetti,Mona Boaz 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.2
Purslane extract (PE) is derived from Portulaca oleracea L., a medicinal plant used in traditional medicine for its antidiabetic properties. This randomized, placebo-controlled clinical trial was designed to evaluate the efficacy and safety of PE in improving glucose control, blood pressure, and lipid profile in adults with type 2 diabetes mellitus (T2DM) treated with a single oral hypoglycemic agent at baseline. Subjects were randomized to treatment with three capsules of PE/day or a matched placebo. Change from baseline to the week 12 end-of-follow-up visit measures of glucose homeostasis, hemodynamics, and lipid profile was compared by treatment assignment. In addition, these measures were evaluated in a subgroup of ‘‘responders,’’ defined as patients whose week 12 HbA1c was lower than baseline values, regardless of treatment assignment. This group was further assessed in subgroups of baseline oral hypoglycemic treatment. A total of 63 participants were treated with either PE (n = 31, 11 females, mean age 52.4 ± 7.9 years) or matched placebo (n = 32, 11 females, mean age 58.3 ± 10.8 years). In the total cohort, systolic blood pressure declined significantly more in the PE group than the placebo group: -7.5 ± 5.0 versus -0.01 ± 0.3 mmHg, P < .0001. In the responders’ subgroup, HbA1c declined significantly more in the PE group than the placebo group: -0.8% ± 0.4% versus -0.6% ± 0.5%, P = .03. Few adverse events were reported. These were mild and did not differ by treatment assignment. PE appears to be a safe, adjunct treatment for T2DM, significantly reducing systolic blood pressure in the total cohort and HbA1c in the subgroup of responders.
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