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Träfflista för sökning "WFRF:(Petrova T V) srt2:(2010-2014)"

Sökning: WFRF:(Petrova T V) > (2010-2014)

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1.
  • Ilieva, L., et al. (författare)
  • Pure hydrogen production via PROX over gold catalysts supported on Pr-modified ceria
  • 2014
  • Ingår i: Fuel. - : Elsevier BV. - 0016-2361 .- 1873-7153. ; 134, s. 628-635
  • Tidskriftsartikel (refereegranskat)abstract
    • Two series of Pr-doped (5 and 10 at.% Pr) cerium oxides were synthesized by impregnation (IM) and microemulsion method (ME). The Au catalysts (3 wt.%) supported on these oxides were tested in PROX. The samples were characterized by XRD, XPS and TPR measurements. At the operating temperature of the fuel cells (80-120 degrees C) gold catalysts on Pr-doped ceria supports synthesized by IM method exhibited much higher PROX activity as compared to the case of ME method. The observed different catalytic behavior was attributed to the different support preparation affecting the gold particle sizes and the mixed support features. In the case of mixed supports synthesized by IM the size of gold particles established by XRD is smaller and the supply of oxygen evidenced by the obtained TPR results is higher as compared to the gold catalysts on the ME prepared mixed supports. The higher gold dispersion as well as the more defective structure assumed by higher microstrain parameter of ceria lattice (XRD data) due to Pr-doping by IM method, improved both the reducibility and the PROX activity up to 120 degrees C.
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2.
  • Wijnhoven, T. M. A., et al. (författare)
  • WHO European Childhood Obesity Surveillance Initiative 2008: weight, height and body mass index in 6-9-year-old children
  • 2013
  • Ingår i: Pediatric Obesity. - : Wiley. - 2047-6310 .- 2047-6302. ; 8:2, s. 79-97
  • Tidskriftsartikel (refereegranskat)abstract
    • Background Nutritional surveillance in school-age children, using measured weight and height, is not common in the European Region of the World Health Organization (WHO). The WHO Regional Office for Europe has therefore initiated the WHO European Childhood Obesity Surveillance Initiative. Objective To present the anthropometric results of data collected in 2007/2008 and to investigate whether there exist differences across countries and between the sexes. Methods Weight and height were measured in 69-year-old children in 12 countries. Prevalence of overweight, obesity, stunting, thinness and underweight as well as mean Z-scores of anthropometric indices of height, weight and body mass index were calculated. Results A total of 168832 children were included in the analyses and a school participation rate of more than 95% was obtained in 8 out of 12 countries. Stunting, underweight and thinness were rarely prevalent. However, 19.349.0% of boys and 18.442.5% of girls were overweight (including obesity and based on the 2007 WHO growth reference).The prevalence of obesity ranged from 6.0 to 26.6% among boys and from 4.6 to 17.3% among girls. Multi-country comparisons suggest the presence of a northsouth gradient with the highest level of overweight found in southern European countries. Conclusions Overweight among 69-year-old children is a serious public health concern and its variation across the European Region highly depends on the country. Comparable monitoring of child growth is possible across Europe and should be emphasized in national policies and implemented as part of action plans.
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