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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Gaiviųjų energinių gėrimų vartojimo paplitimas Vilniaus miesto 5-10 klasių mokinių tarpe ir jų žinios apie šiuos gėrimus / The prevalence of energy drinks consumption in vilnius city among the 5-10th form pupils and their knowledge about these drinks

Juršytė, Daina 27 June 2014 (has links)
SANTRAUKA Raktažodžiai: energinis gėrimas, kofeinas, taurinas, vaikai, perdozavimas, alkoholis. Darbo tikslas. Nustatyti gaiviųjų energinių gėrimų vartojimo paplitimą Vilniaus miesto 5-10 klasių mokinių tarpe ir įvertinti jų žinias apie šiuos gėrimus. Metodai. Tyrimas atliktas anoniminės anketinės apklausos būdu. Anketą sudarė 35 klausimai. Apklausti 1837 trylikos Vilniaus miesto ugdymo įstaigų 5 – 10 klasių mokiniai. Surinktų anketų duomenys buvo apdoroti naudojantis statistinio paketo SPSS 17.0 versija. Kokybiniams dydžiams tirti, požymių homogeniškumui grupėse tikrinti, ryšiui tarp kintamųjų įvertinti naudotas Chi kvadrato (&#61539;2) testas, o mažiems skaičiams (n < 5) – Fišerio (F) tikslusis testas. Rezultatų skirtumas tarp kintamųjų laikytas statistiškai reikšmingu, kai p &#8804; 0,05. Ieškant statistinių-koreliacinių ryšių tarp kintamųjų, apskaičiavimams naudotas statistinis ryšio stiprumą ir kryptį rodantis Spearmano koreliacijos koeficientas. Dviejų nepriklausomų imčių neparametriniam palyginimui buvo naudojamas Mann’o ir Whitney U testas, o daugiau negu dviem nepriklausomoms imtims palyginti – Kruscal’o ir Wallis’o testas. Rezultatai. Nustatyta, kad energinius gėrimus vartojo 32,8 proc. mokinių, juos buvo vartoję, bet nebevartojo tyrimo metu 34,4 proc. ir niekada nevartojo – 32,8 proc. respondentų. Juos vartojo statistiškai reikšmingai daugiau berniukų negu mergaičių ir 7 – 10 klasių mokinių negu 5, 6 klasių. Daugiausiai respondentų energinius gėrimus vartojo 1 k... [toliau žr. visą tekstą] / SUMMARY Key-words: energy drink, caffeine, taurine, children, overdosing, alcohol. The aim of the paper: Ascertain the prevalence of energy drinks consumption among the 5 – 10 th form pupils in Vilnius city and evaluate their knowledge about these drinks. Methods: A method of anonymous questionnaires was used, made up of 35 questions. 1837, 5-10 form pupils of 13 educational institutions in Vilnius city were questioned. For data analysis SPSS program version 17.0. was used. Qualitative coherence between variables is established by Chi-square (&#61539;2) test, while small numbers (n less 5) by Fisher’s (F) exact test. Disparity of result between variables assessed statistically important, when p &#8804; 0.05. Searching for statistical – correlative relationship between variables, for computation Spearman’s correlation coefficient. of statistical connection intensity and direction was used. The Mann Whitney U test of two independent samples of non-parametric comparison was used and for more than two independent samples – Kruskal Wallis test. Results: Ascertained, that energy drinks are used by 32.8 % schoolchildren, were using, but have not used during testing 34.4 % and 32.8 % of respondents had never used. Statistics show more significant consumption among boys than girls and more of 7-10 forms schoolchildren in comparison with 5-6 forms. The largest number of respondents used energy drinks once a week (22.6 %), 19.2% - once a month and 17.2 % - twice or four times a month... [to full text]
2

Investigating Galvanic Corrosion in Low-Alkalinity Water: The Effects of pH, High Dose Corrosion Inhibitors, and Dissolved Inorganic Carbon

McClintock, Amy 15 July 2013 (has links)
The objective of this study was to evaluate galvanic corrosion potential under various pH conditions, buffering capacities, and corrosion inhibitors including zinc orthophosphate (ZOP) and orthophosphate (OP). Bench-scale dump-and-fill experiments evaluated metals release from a lead and copper couple under stagnant conditions. Key findings from this study were that increasing DIC from 3 to 7 or 17 mg CaCO3/L significantly reduced lead release with or without corrosion inhibitor; however, the lowest lead concentrations were observed in water conditions with corrosion inhibitor addition. However, addition of 20 mg PO4/L as OP exacerbated lead release in some cases; though dissolved lead release was always below 28 µg/L, particulate lead was as much as 4 times greater compared to no corrosion inhibitor. Overall, this study demonstrated the potential of high dose ZOP and OP for lead corrosion control in drinking water, however, overdosing OP can lead to exacerbated particulate concentrations.

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